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2 | =head1 NAME |
3 | ||
be9a9b1d | 4 | perl5db.pl - the perl debugger |
69893cff RGS |
5 | |
6 | =head1 SYNOPSIS | |
7 | ||
8 | perl -d your_Perl_script | |
9 | ||
10 | =head1 DESCRIPTION | |
11 | ||
12 | C<perl5db.pl> is the perl debugger. It is loaded automatically by Perl when | |
13 | you invoke a script with C<perl -d>. This documentation tries to outline the | |
14 | structure and services provided by C<perl5db.pl>, and to describe how you | |
15 | can use them. | |
16 | ||
17 | =head1 GENERAL NOTES | |
18 | ||
19 | The debugger can look pretty forbidding to many Perl programmers. There are | |
20 | a number of reasons for this, many stemming out of the debugger's history. | |
21 | ||
22 | When the debugger was first written, Perl didn't have a lot of its nicer | |
23 | features - no references, no lexical variables, no closures, no object-oriented | |
24 | programming. So a lot of the things one would normally have done using such | |
25 | features was done using global variables, globs and the C<local()> operator | |
26 | in creative ways. | |
27 | ||
28 | Some of these have survived into the current debugger; a few of the more | |
29 | interesting and still-useful idioms are noted in this section, along with notes | |
30 | on the comments themselves. | |
31 | ||
32 | =head2 Why not use more lexicals? | |
33 | ||
34 | Experienced Perl programmers will note that the debugger code tends to use | |
35 | mostly package globals rather than lexically-scoped variables. This is done | |
36 | to allow a significant amount of control of the debugger from outside the | |
37 | debugger itself. | |
38 | ||
39 | Unfortunately, though the variables are accessible, they're not well | |
40 | documented, so it's generally been a decision that hasn't made a lot of | |
41 | difference to most users. Where appropriate, comments have been added to | |
42 | make variables more accessible and usable, with the understanding that these | |
be9a9b1d | 43 | I<are> debugger internals, and are therefore subject to change. Future |
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44 | development should probably attempt to replace the globals with a well-defined |
45 | API, but for now, the variables are what we've got. | |
46 | ||
47 | =head2 Automated variable stacking via C<local()> | |
48 | ||
49 | As you may recall from reading C<perlfunc>, the C<local()> operator makes a | |
50 | temporary copy of a variable in the current scope. When the scope ends, the | |
51 | old copy is restored. This is often used in the debugger to handle the | |
52 | automatic stacking of variables during recursive calls: | |
53 | ||
54 | sub foo { | |
55 | local $some_global++; | |
56 | ||
57 | # Do some stuff, then ... | |
58 | return; | |
59 | } | |
60 | ||
61 | What happens is that on entry to the subroutine, C<$some_global> is localized, | |
62 | then altered. When the subroutine returns, Perl automatically undoes the | |
63 | localization, restoring the previous value. Voila, automatic stack management. | |
64 | ||
65 | The debugger uses this trick a I<lot>. Of particular note is C<DB::eval>, | |
66 | which lets the debugger get control inside of C<eval>'ed code. The debugger | |
67 | localizes a saved copy of C<$@> inside the subroutine, which allows it to | |
68 | keep C<$@> safe until it C<DB::eval> returns, at which point the previous | |
69 | value of C<$@> is restored. This makes it simple (well, I<simpler>) to keep | |
70 | track of C<$@> inside C<eval>s which C<eval> other C<eval's>. | |
71 | ||
72 | In any case, watch for this pattern. It occurs fairly often. | |
73 | ||
74 | =head2 The C<^> trick | |
75 | ||
76 | This is used to cleverly reverse the sense of a logical test depending on | |
77 | the value of an auxiliary variable. For instance, the debugger's C<S> | |
78 | (search for subroutines by pattern) allows you to negate the pattern | |
79 | like this: | |
80 | ||
81 | # Find all non-'foo' subs: | |
82 | S !/foo/ | |
83 | ||
84 | Boolean algebra states that the truth table for XOR looks like this: | |
85 | ||
86 | =over 4 | |
87 | ||
88 | =item * 0 ^ 0 = 0 | |
89 | ||
90 | (! not present and no match) --> false, don't print | |
91 | ||
92 | =item * 0 ^ 1 = 1 | |
93 | ||
94 | (! not present and matches) --> true, print | |
95 | ||
96 | =item * 1 ^ 0 = 1 | |
97 | ||
98 | (! present and no match) --> true, print | |
99 | ||
100 | =item * 1 ^ 1 = 0 | |
101 | ||
102 | (! present and matches) --> false, don't print | |
103 | ||
104 | =back | |
105 | ||
106 | As you can see, the first pair applies when C<!> isn't supplied, and | |
be9a9b1d | 107 | the second pair applies when it is. The XOR simply allows us to |
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108 | compact a more complicated if-then-elseif-else into a more elegant |
109 | (but perhaps overly clever) single test. After all, it needed this | |
110 | explanation... | |
111 | ||
112 | =head2 FLAGS, FLAGS, FLAGS | |
113 | ||
114 | There is a certain C programming legacy in the debugger. Some variables, | |
be9a9b1d | 115 | such as C<$single>, C<$trace>, and C<$frame>, have I<magical> values composed |
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116 | of 1, 2, 4, etc. (powers of 2) OR'ed together. This allows several pieces |
117 | of state to be stored independently in a single scalar. | |
118 | ||
119 | A test like | |
120 | ||
121 | if ($scalar & 4) ... | |
122 | ||
123 | is checking to see if the appropriate bit is on. Since each bit can be | |
124 | "addressed" independently in this way, C<$scalar> is acting sort of like | |
125 | an array of bits. Obviously, since the contents of C<$scalar> are just a | |
126 | bit-pattern, we can save and restore it easily (it will just look like | |
127 | a number). | |
128 | ||
129 | The problem, is of course, that this tends to leave magic numbers scattered | |
130 | all over your program whenever a bit is set, cleared, or checked. So why do | |
131 | it? | |
132 | ||
133 | =over 4 | |
134 | ||
be9a9b1d | 135 | =item * |
69893cff | 136 | |
be9a9b1d | 137 | First, doing an arithmetical or bitwise operation on a scalar is |
69893cff | 138 | just about the fastest thing you can do in Perl: C<use constant> actually |
be9a9b1d | 139 | creates a subroutine call, and array and hash lookups are much slower. Is |
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140 | this over-optimization at the expense of readability? Possibly, but the |
141 | debugger accesses these variables a I<lot>. Any rewrite of the code will | |
142 | probably have to benchmark alternate implementations and see which is the | |
143 | best balance of readability and speed, and then document how it actually | |
144 | works. | |
145 | ||
be9a9b1d AT |
146 | =item * |
147 | ||
148 | Second, it's very easy to serialize a scalar number. This is done in | |
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149 | the restart code; the debugger state variables are saved in C<%ENV> and then |
150 | restored when the debugger is restarted. Having them be just numbers makes | |
151 | this trivial. | |
152 | ||
be9a9b1d AT |
153 | =item * |
154 | ||
155 | Third, some of these variables are being shared with the Perl core | |
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156 | smack in the middle of the interpreter's execution loop. It's much faster for |
157 | a C program (like the interpreter) to check a bit in a scalar than to access | |
158 | several different variables (or a Perl array). | |
159 | ||
160 | =back | |
161 | ||
162 | =head2 What are those C<XXX> comments for? | |
163 | ||
164 | Any comment containing C<XXX> means that the comment is either somewhat | |
165 | speculative - it's not exactly clear what a given variable or chunk of | |
166 | code is doing, or that it is incomplete - the basics may be clear, but the | |
167 | subtleties are not completely documented. | |
168 | ||
169 | Send in a patch if you can clear up, fill out, or clarify an C<XXX>. | |
170 | ||
171 | =head1 DATA STRUCTURES MAINTAINED BY CORE | |
172 | ||
173 | There are a number of special data structures provided to the debugger by | |
174 | the Perl interpreter. | |
175 | ||
176 | The array C<@{$main::{'_<'.$filename}}> (aliased locally to C<@dbline> via glob | |
177 | assignment) contains the text from C<$filename>, with each element | |
178 | corresponding to a single line of C<$filename>. | |
179 | ||
180 | The hash C<%{'_<'.$filename}> (aliased locally to C<%dbline> via glob | |
181 | assignment) contains breakpoints and actions. The keys are line numbers; | |
182 | you can set individual values, but not the whole hash. The Perl interpreter | |
183 | uses this hash to determine where breakpoints have been set. Any true value is | |
be9a9b1d | 184 | considered to be a breakpoint; C<perl5db.pl> uses C<$break_condition\0$action>. |
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185 | Values are magical in numeric context: 1 if the line is breakable, 0 if not. |
186 | ||
be9a9b1d AT |
187 | The scalar C<${"_<$filename"}> simply contains the string C<_<$filename>. |
188 | This is also the case for evaluated strings that contain subroutines, or | |
189 | which are currently being executed. The $filename for C<eval>ed strings looks | |
190 | like C<(eval 34)> or C<(re_eval 19)>. | |
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191 | |
192 | =head1 DEBUGGER STARTUP | |
193 | ||
194 | When C<perl5db.pl> starts, it reads an rcfile (C<perl5db.ini> for | |
195 | non-interactive sessions, C<.perldb> for interactive ones) that can set a number | |
196 | of options. In addition, this file may define a subroutine C<&afterinit> | |
197 | that will be executed (in the debugger's context) after the debugger has | |
198 | initialized itself. | |
199 | ||
200 | Next, it checks the C<PERLDB_OPTS> environment variable and treats its | |
be9a9b1d | 201 | contents as the argument of a C<o> command in the debugger. |
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202 | |
203 | =head2 STARTUP-ONLY OPTIONS | |
204 | ||
205 | The following options can only be specified at startup. | |
206 | To set them in your rcfile, add a call to | |
207 | C<&parse_options("optionName=new_value")>. | |
208 | ||
209 | =over 4 | |
210 | ||
211 | =item * TTY | |
212 | ||
213 | the TTY to use for debugging i/o. | |
214 | ||
215 | =item * noTTY | |
216 | ||
217 | if set, goes in NonStop mode. On interrupt, if TTY is not set, | |
b0e77abc | 218 | uses the value of noTTY or F<$HOME/.perldbtty$$> to find TTY using |
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219 | Term::Rendezvous. Current variant is to have the name of TTY in this |
220 | file. | |
221 | ||
222 | =item * ReadLine | |
223 | ||
5561b870 | 224 | if false, a dummy ReadLine is used, so you can debug |
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225 | ReadLine applications. |
226 | ||
227 | =item * NonStop | |
228 | ||
229 | if true, no i/o is performed until interrupt. | |
230 | ||
231 | =item * LineInfo | |
232 | ||
233 | file or pipe to print line number info to. If it is a | |
234 | pipe, a short "emacs like" message is used. | |
235 | ||
236 | =item * RemotePort | |
237 | ||
238 | host:port to connect to on remote host for remote debugging. | |
239 | ||
5561b870 A |
240 | =item * HistFile |
241 | ||
242 | file to store session history to. There is no default and so no | |
243 | history file is written unless this variable is explicitly set. | |
244 | ||
245 | =item * HistSize | |
246 | ||
247 | number of commands to store to the file specified in C<HistFile>. | |
248 | Default is 100. | |
249 | ||
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250 | =back |
251 | ||
252 | =head3 SAMPLE RCFILE | |
253 | ||
254 | &parse_options("NonStop=1 LineInfo=db.out"); | |
255 | sub afterinit { $trace = 1; } | |
256 | ||
257 | The script will run without human intervention, putting trace | |
258 | information into C<db.out>. (If you interrupt it, you had better | |
be9a9b1d | 259 | reset C<LineInfo> to something I<interactive>!) |
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260 | |
261 | =head1 INTERNALS DESCRIPTION | |
262 | ||
263 | =head2 DEBUGGER INTERFACE VARIABLES | |
264 | ||
265 | Perl supplies the values for C<%sub>. It effectively inserts | |
be9a9b1d | 266 | a C<&DB::DB();> in front of each place that can have a |
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267 | breakpoint. At each subroutine call, it calls C<&DB::sub> with |
268 | C<$DB::sub> set to the called subroutine. It also inserts a C<BEGIN | |
269 | {require 'perl5db.pl'}> before the first line. | |
270 | ||
271 | After each C<require>d file is compiled, but before it is executed, a | |
272 | call to C<&DB::postponed($main::{'_<'.$filename})> is done. C<$filename> | |
273 | is the expanded name of the C<require>d file (as found via C<%INC>). | |
274 | ||
275 | =head3 IMPORTANT INTERNAL VARIABLES | |
276 | ||
277 | =head4 C<$CreateTTY> | |
278 | ||
279 | Used to control when the debugger will attempt to acquire another TTY to be | |
280 | used for input. | |
281 | ||
282 | =over | |
283 | ||
284 | =item * 1 - on C<fork()> | |
285 | ||
286 | =item * 2 - debugger is started inside debugger | |
287 | ||
288 | =item * 4 - on startup | |
289 | ||
290 | =back | |
291 | ||
292 | =head4 C<$doret> | |
293 | ||
294 | The value -2 indicates that no return value should be printed. | |
295 | Any other positive value causes C<DB::sub> to print return values. | |
296 | ||
297 | =head4 C<$evalarg> | |
298 | ||
299 | The item to be eval'ed by C<DB::eval>. Used to prevent messing with the current | |
300 | contents of C<@_> when C<DB::eval> is called. | |
301 | ||
302 | =head4 C<$frame> | |
303 | ||
304 | Determines what messages (if any) will get printed when a subroutine (or eval) | |
305 | is entered or exited. | |
306 | ||
307 | =over 4 | |
308 | ||
309 | =item * 0 - No enter/exit messages | |
310 | ||
be9a9b1d | 311 | =item * 1 - Print I<entering> messages on subroutine entry |
69893cff RGS |
312 | |
313 | =item * 2 - Adds exit messages on subroutine exit. If no other flag is on, acts like 1+2. | |
314 | ||
be9a9b1d | 315 | =item * 4 - Extended messages: C<< <in|out> I<context>=I<fully-qualified sub name> from I<file>:I<line> >>. If no other flag is on, acts like 1+4. |
69893cff RGS |
316 | |
317 | =item * 8 - Adds parameter information to messages, and overloaded stringify and tied FETCH is enabled on the printed arguments. Ignored if C<4> is not on. | |
318 | ||
319 | =item * 16 - Adds C<I<context> return from I<subname>: I<value>> messages on subroutine/eval exit. Ignored if C<4> is is not on. | |
320 | ||
321 | =back | |
322 | ||
be9a9b1d | 323 | To get everything, use C<$frame=30> (or C<o f=30> as a debugger command). |
69893cff RGS |
324 | The debugger internally juggles the value of C<$frame> during execution to |
325 | protect external modules that the debugger uses from getting traced. | |
326 | ||
327 | =head4 C<$level> | |
328 | ||
329 | Tracks current debugger nesting level. Used to figure out how many | |
330 | C<E<lt>E<gt>> pairs to surround the line number with when the debugger | |
331 | outputs a prompt. Also used to help determine if the program has finished | |
332 | during command parsing. | |
333 | ||
334 | =head4 C<$onetimeDump> | |
335 | ||
336 | Controls what (if anything) C<DB::eval()> will print after evaluating an | |
337 | expression. | |
338 | ||
339 | =over 4 | |
340 | ||
341 | =item * C<undef> - don't print anything | |
342 | ||
343 | =item * C<dump> - use C<dumpvar.pl> to display the value returned | |
344 | ||
345 | =item * C<methods> - print the methods callable on the first item returned | |
346 | ||
347 | =back | |
348 | ||
349 | =head4 C<$onetimeDumpDepth> | |
350 | ||
be9a9b1d | 351 | Controls how far down C<dumpvar.pl> will go before printing C<...> while |
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352 | dumping a structure. Numeric. If C<undef>, print all levels. |
353 | ||
354 | =head4 C<$signal> | |
355 | ||
356 | Used to track whether or not an C<INT> signal has been detected. C<DB::DB()>, | |
357 | which is called before every statement, checks this and puts the user into | |
358 | command mode if it finds C<$signal> set to a true value. | |
359 | ||
360 | =head4 C<$single> | |
361 | ||
362 | Controls behavior during single-stepping. Stacked in C<@stack> on entry to | |
363 | each subroutine; popped again at the end of each subroutine. | |
364 | ||
365 | =over 4 | |
366 | ||
367 | =item * 0 - run continuously. | |
368 | ||
be9a9b1d | 369 | =item * 1 - single-step, go into subs. The C<s> command. |
69893cff | 370 | |
be9a9b1d | 371 | =item * 2 - single-step, don't go into subs. The C<n> command. |
69893cff | 372 | |
be9a9b1d AT |
373 | =item * 4 - print current sub depth (turned on to force this when C<too much |
374 | recursion> occurs. | |
69893cff RGS |
375 | |
376 | =back | |
377 | ||
378 | =head4 C<$trace> | |
379 | ||
380 | Controls the output of trace information. | |
381 | ||
382 | =over 4 | |
383 | ||
384 | =item * 1 - The C<t> command was entered to turn on tracing (every line executed is printed) | |
385 | ||
386 | =item * 2 - watch expressions are active | |
387 | ||
388 | =item * 4 - user defined a C<watchfunction()> in C<afterinit()> | |
389 | ||
390 | =back | |
391 | ||
392 | =head4 C<$slave_editor> | |
393 | ||
394 | 1 if C<LINEINFO> was directed to a pipe; 0 otherwise. | |
395 | ||
396 | =head4 C<@cmdfhs> | |
397 | ||
398 | Stack of filehandles that C<DB::readline()> will read commands from. | |
399 | Manipulated by the debugger's C<source> command and C<DB::readline()> itself. | |
400 | ||
401 | =head4 C<@dbline> | |
402 | ||
403 | Local alias to the magical line array, C<@{$main::{'_<'.$filename}}> , | |
404 | supplied by the Perl interpreter to the debugger. Contains the source. | |
405 | ||
406 | =head4 C<@old_watch> | |
407 | ||
408 | Previous values of watch expressions. First set when the expression is | |
409 | entered; reset whenever the watch expression changes. | |
410 | ||
411 | =head4 C<@saved> | |
412 | ||
413 | Saves important globals (C<$@>, C<$!>, C<$^E>, C<$,>, C<$/>, C<$\>, C<$^W>) | |
414 | so that the debugger can substitute safe values while it's running, and | |
415 | restore them when it returns control. | |
416 | ||
417 | =head4 C<@stack> | |
418 | ||
419 | Saves the current value of C<$single> on entry to a subroutine. | |
420 | Manipulated by the C<c> command to turn off tracing in all subs above the | |
421 | current one. | |
422 | ||
423 | =head4 C<@to_watch> | |
424 | ||
425 | The 'watch' expressions: to be evaluated before each line is executed. | |
426 | ||
427 | =head4 C<@typeahead> | |
428 | ||
429 | The typeahead buffer, used by C<DB::readline>. | |
430 | ||
431 | =head4 C<%alias> | |
432 | ||
433 | Command aliases. Stored as character strings to be substituted for a command | |
434 | entered. | |
435 | ||
436 | =head4 C<%break_on_load> | |
437 | ||
438 | Keys are file names, values are 1 (break when this file is loaded) or undef | |
439 | (don't break when it is loaded). | |
440 | ||
441 | =head4 C<%dbline> | |
442 | ||
be9a9b1d | 443 | Keys are line numbers, values are C<condition\0action>. If used in numeric |
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444 | context, values are 0 if not breakable, 1 if breakable, no matter what is |
445 | in the actual hash entry. | |
446 | ||
447 | =head4 C<%had_breakpoints> | |
448 | ||
449 | Keys are file names; values are bitfields: | |
450 | ||
451 | =over 4 | |
452 | ||
453 | =item * 1 - file has a breakpoint in it. | |
454 | ||
455 | =item * 2 - file has an action in it. | |
456 | ||
457 | =back | |
458 | ||
459 | A zero or undefined value means this file has neither. | |
460 | ||
461 | =head4 C<%option> | |
462 | ||
463 | Stores the debugger options. These are character string values. | |
464 | ||
465 | =head4 C<%postponed> | |
466 | ||
467 | Saves breakpoints for code that hasn't been compiled yet. | |
468 | Keys are subroutine names, values are: | |
469 | ||
470 | =over 4 | |
471 | ||
be9a9b1d | 472 | =item * C<compile> - break when this sub is compiled |
69893cff | 473 | |
be9a9b1d | 474 | =item * C<< break +0 if <condition> >> - break (conditionally) at the start of this routine. The condition will be '1' if no condition was specified. |
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475 | |
476 | =back | |
477 | ||
478 | =head4 C<%postponed_file> | |
479 | ||
480 | This hash keeps track of breakpoints that need to be set for files that have | |
481 | not yet been compiled. Keys are filenames; values are references to hashes. | |
482 | Each of these hashes is keyed by line number, and its values are breakpoint | |
be9a9b1d | 483 | definitions (C<condition\0action>). |
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484 | |
485 | =head1 DEBUGGER INITIALIZATION | |
486 | ||
487 | The debugger's initialization actually jumps all over the place inside this | |
488 | package. This is because there are several BEGIN blocks (which of course | |
489 | execute immediately) spread through the code. Why is that? | |
490 | ||
491 | The debugger needs to be able to change some things and set some things up | |
492 | before the debugger code is compiled; most notably, the C<$deep> variable that | |
493 | C<DB::sub> uses to tell when a program has recursed deeply. In addition, the | |
494 | debugger has to turn off warnings while the debugger code is compiled, but then | |
495 | restore them to their original setting before the program being debugged begins | |
496 | executing. | |
497 | ||
498 | The first C<BEGIN> block simply turns off warnings by saving the current | |
499 | setting of C<$^W> and then setting it to zero. The second one initializes | |
500 | the debugger variables that are needed before the debugger begins executing. | |
501 | The third one puts C<$^X> back to its former value. | |
502 | ||
503 | We'll detail the second C<BEGIN> block later; just remember that if you need | |
504 | to initialize something before the debugger starts really executing, that's | |
505 | where it has to go. | |
506 | ||
507 | =cut | |
508 | ||
a687059c LW |
509 | package DB; |
510 | ||
c7e68384 | 511 | BEGIN {eval 'use IO::Handle'}; # Needed for flush only? breaks under miniperl |
9eba6a4e | 512 | |
54d04a52 | 513 | # Debugger for Perl 5.00x; perl5db.pl patch level: |
5561b870 | 514 | $VERSION = 1.30; |
69893cff | 515 | |
e22ea7cc | 516 | $header = "perl5db.pl version $VERSION"; |
d338d6fe | 517 | |
69893cff RGS |
518 | =head1 DEBUGGER ROUTINES |
519 | ||
520 | =head2 C<DB::eval()> | |
521 | ||
522 | This function replaces straight C<eval()> inside the debugger; it simplifies | |
523 | the process of evaluating code in the user's context. | |
524 | ||
525 | The code to be evaluated is passed via the package global variable | |
526 | C<$DB::evalarg>; this is done to avoid fiddling with the contents of C<@_>. | |
527 | ||
be9a9b1d AT |
528 | Before we do the C<eval()>, we preserve the current settings of C<$trace>, |
529 | C<$single>, C<$^D> and C<$usercontext>. The latter contains the | |
530 | preserved values of C<$@>, C<$!>, C<$^E>, C<$,>, C<$/>, C<$\>, C<$^W> and the | |
531 | user's current package, grabbed when C<DB::DB> got control. This causes the | |
532 | proper context to be used when the eval is actually done. Afterward, we | |
533 | restore C<$trace>, C<$single>, and C<$^D>. | |
69893cff RGS |
534 | |
535 | Next we need to handle C<$@> without getting confused. We save C<$@> in a | |
536 | local lexical, localize C<$saved[0]> (which is where C<save()> will put | |
537 | C<$@>), and then call C<save()> to capture C<$@>, C<$!>, C<$^E>, C<$,>, | |
538 | C<$/>, C<$\>, and C<$^W>) and set C<$,>, C<$/>, C<$\>, and C<$^W> to values | |
539 | considered sane by the debugger. If there was an C<eval()> error, we print | |
be9a9b1d AT |
540 | it on the debugger's output. If C<$onetimedump> is defined, we call |
541 | C<dumpit> if it's set to 'dump', or C<methods> if it's set to | |
69893cff RGS |
542 | 'methods'. Setting it to something else causes the debugger to do the eval |
543 | but not print the result - handy if you want to do something else with it | |
544 | (the "watch expressions" code does this to get the value of the watch | |
545 | expression but not show it unless it matters). | |
546 | ||
547 | In any case, we then return the list of output from C<eval> to the caller, | |
548 | and unwinding restores the former version of C<$@> in C<@saved> as well | |
549 | (the localization of C<$saved[0]> goes away at the end of this scope). | |
550 | ||
551 | =head3 Parameters and variables influencing execution of DB::eval() | |
552 | ||
553 | C<DB::eval> isn't parameterized in the standard way; this is to keep the | |
554 | debugger's calls to C<DB::eval()> from mucking with C<@_>, among other things. | |
555 | The variables listed below influence C<DB::eval()>'s execution directly. | |
556 | ||
557 | =over 4 | |
558 | ||
559 | =item C<$evalarg> - the thing to actually be eval'ed | |
560 | ||
be9a9b1d | 561 | =item C<$trace> - Current state of execution tracing |
69893cff | 562 | |
be9a9b1d | 563 | =item C<$single> - Current state of single-stepping |
69893cff RGS |
564 | |
565 | =item C<$onetimeDump> - what is to be displayed after the evaluation | |
566 | ||
567 | =item C<$onetimeDumpDepth> - how deep C<dumpit()> should go when dumping results | |
568 | ||
569 | =back | |
570 | ||
571 | The following variables are altered by C<DB::eval()> during its execution. They | |
572 | are "stacked" via C<local()>, enabling recursive calls to C<DB::eval()>. | |
573 | ||
574 | =over 4 | |
575 | ||
576 | =item C<@res> - used to capture output from actual C<eval>. | |
577 | ||
578 | =item C<$otrace> - saved value of C<$trace>. | |
579 | ||
580 | =item C<$osingle> - saved value of C<$single>. | |
581 | ||
582 | =item C<$od> - saved value of C<$^D>. | |
583 | ||
584 | =item C<$saved[0]> - saved value of C<$@>. | |
585 | ||
586 | =item $\ - for output of C<$@> if there is an evaluation error. | |
587 | ||
588 | =back | |
589 | ||
590 | =head3 The problem of lexicals | |
591 | ||
592 | The context of C<DB::eval()> presents us with some problems. Obviously, | |
593 | we want to be 'sandboxed' away from the debugger's internals when we do | |
594 | the eval, but we need some way to control how punctuation variables and | |
595 | debugger globals are used. | |
596 | ||
597 | We can't use local, because the code inside C<DB::eval> can see localized | |
598 | variables; and we can't use C<my> either for the same reason. The code | |
599 | in this routine compromises and uses C<my>. | |
600 | ||
601 | After this routine is over, we don't have user code executing in the debugger's | |
602 | context, so we can use C<my> freely. | |
603 | ||
604 | =cut | |
605 | ||
606 | ############################################## Begin lexical danger zone | |
607 | ||
608 | # 'my' variables used here could leak into (that is, be visible in) | |
609 | # the context that the code being evaluated is executing in. This means that | |
610 | # the code could modify the debugger's variables. | |
611 | # | |
612 | # Fiddling with the debugger's context could be Bad. We insulate things as | |
613 | # much as we can. | |
614 | ||
c1051fcf | 615 | sub eval { |
69893cff | 616 | |
c1051fcf | 617 | # 'my' would make it visible from user code |
e22ea7cc | 618 | # but so does local! --tchrist |
69893cff | 619 | # Remember: this localizes @DB::res, not @main::res. |
c1051fcf IZ |
620 | local @res; |
621 | { | |
e22ea7cc RF |
622 | |
623 | # Try to keep the user code from messing with us. Save these so that | |
624 | # even if the eval'ed code changes them, we can put them back again. | |
625 | # Needed because the user could refer directly to the debugger's | |
69893cff RGS |
626 | # package globals (and any 'my' variables in this containing scope) |
627 | # inside the eval(), and we want to try to stay safe. | |
e22ea7cc | 628 | local $otrace = $trace; |
69893cff RGS |
629 | local $osingle = $single; |
630 | local $od = $^D; | |
631 | ||
632 | # Untaint the incoming eval() argument. | |
633 | { ($evalarg) = $evalarg =~ /(.*)/s; } | |
634 | ||
e22ea7cc | 635 | # $usercontext built in DB::DB near the comment |
69893cff RGS |
636 | # "set up the context for DB::eval ..." |
637 | # Evaluate and save any results. | |
e22ea7cc | 638 | @res = eval "$usercontext $evalarg;\n"; # '\n' for nice recursive debug |
69893cff RGS |
639 | |
640 | # Restore those old values. | |
641 | $trace = $otrace; | |
642 | $single = $osingle; | |
643 | $^D = $od; | |
c1051fcf | 644 | } |
69893cff RGS |
645 | |
646 | # Save the current value of $@, and preserve it in the debugger's copy | |
647 | # of the saved precious globals. | |
c1051fcf | 648 | my $at = $@; |
69893cff RGS |
649 | |
650 | # Since we're only saving $@, we only have to localize the array element | |
651 | # that it will be stored in. | |
e22ea7cc | 652 | local $saved[0]; # Preserve the old value of $@ |
c1051fcf | 653 | eval { &DB::save }; |
69893cff RGS |
654 | |
655 | # Now see whether we need to report an error back to the user. | |
c1051fcf | 656 | if ($at) { |
69893cff RGS |
657 | local $\ = ''; |
658 | print $OUT $at; | |
659 | } | |
660 | ||
661 | # Display as required by the caller. $onetimeDump and $onetimedumpDepth | |
662 | # are package globals. | |
663 | elsif ($onetimeDump) { | |
e22ea7cc RF |
664 | if ( $onetimeDump eq 'dump' ) { |
665 | local $option{dumpDepth} = $onetimedumpDepth | |
666 | if defined $onetimedumpDepth; | |
667 | dumpit( $OUT, \@res ); | |
668 | } | |
669 | elsif ( $onetimeDump eq 'methods' ) { | |
670 | methods( $res[0] ); | |
671 | } | |
69893cff | 672 | } ## end elsif ($onetimeDump) |
c1051fcf | 673 | @res; |
69893cff RGS |
674 | } ## end sub eval |
675 | ||
676 | ############################################## End lexical danger zone | |
c1051fcf | 677 | |
e22ea7cc RF |
678 | # After this point it is safe to introduce lexicals. |
679 | # The code being debugged will be executing in its own context, and | |
69893cff | 680 | # can't see the inside of the debugger. |
d338d6fe | 681 | # |
e22ea7cc | 682 | # However, one should not overdo it: leave as much control from outside as |
69893cff RGS |
683 | # possible. If you make something a lexical, it's not going to be addressable |
684 | # from outside the debugger even if you know its name. | |
685 | ||
d338d6fe | 686 | # This file is automatically included if you do perl -d. |
687 | # It's probably not useful to include this yourself. | |
688 | # | |
e22ea7cc | 689 | # Before venturing further into these twisty passages, it is |
2f7e9187 MS |
690 | # wise to read the perldebguts man page or risk the ire of dragons. |
691 | # | |
69893cff RGS |
692 | # (It should be noted that perldebguts will tell you a lot about |
693 | # the underlying mechanics of how the debugger interfaces into the | |
694 | # Perl interpreter, but not a lot about the debugger itself. The new | |
695 | # comments in this code try to address this problem.) | |
696 | ||
d338d6fe | 697 | # Note that no subroutine call is possible until &DB::sub is defined |
36477c24 | 698 | # (for subroutines defined outside of the package DB). In fact the same is |
d338d6fe | 699 | # true if $deep is not defined. |
055fd3a9 GS |
700 | |
701 | # Enhanced by ilya@math.ohio-state.edu (Ilya Zakharevich) | |
055fd3a9 GS |
702 | |
703 | # modified Perl debugger, to be run from Emacs in perldb-mode | |
704 | # Ray Lischner (uunet!mntgfx!lisch) as of 5 Nov 1990 | |
705 | # Johan Vromans -- upgrade to 4.0 pl 10 | |
706 | # Ilya Zakharevich -- patches after 5.001 (and some before ;-) | |
707 | ||
69893cff RGS |
708 | # (We have made efforts to clarify the comments in the change log |
709 | # in other places; some of them may seem somewhat obscure as they | |
710 | # were originally written, and explaining them away from the code | |
711 | # in question seems conterproductive.. -JM) | |
712 | ||
713 | ######################################################################## | |
714 | # Changes: 0.94 | |
715 | # + A lot of things changed after 0.94. First of all, core now informs | |
716 | # debugger about entry into XSUBs, overloaded operators, tied operations, | |
717 | # BEGIN and END. Handy with `O f=2'. | |
718 | # + This can make debugger a little bit too verbose, please be patient | |
719 | # and report your problems promptly. | |
720 | # + Now the option frame has 3 values: 0,1,2. XXX Document! | |
721 | # + Note that if DESTROY returns a reference to the object (or object), | |
722 | # the deletion of data may be postponed until the next function call, | |
723 | # due to the need to examine the return value. | |
724 | # | |
725 | # Changes: 0.95 | |
726 | # + `v' command shows versions. | |
727 | # | |
e22ea7cc | 728 | # Changes: 0.96 |
69893cff RGS |
729 | # + `v' command shows version of readline. |
730 | # primitive completion works (dynamic variables, subs for `b' and `l', | |
731 | # options). Can `p %var' | |
732 | # + Better help (`h <' now works). New commands <<, >>, {, {{. | |
733 | # {dump|print}_trace() coded (to be able to do it from <<cmd). | |
734 | # + `c sub' documented. | |
735 | # + At last enough magic combined to stop after the end of debuggee. | |
736 | # + !! should work now (thanks to Emacs bracket matching an extra | |
737 | # `]' in a regexp is caught). | |
738 | # + `L', `D' and `A' span files now (as documented). | |
739 | # + Breakpoints in `require'd code are possible (used in `R'). | |
740 | # + Some additional words on internal work of debugger. | |
741 | # + `b load filename' implemented. | |
742 | # + `b postpone subr' implemented. | |
743 | # + now only `q' exits debugger (overwritable on $inhibit_exit). | |
744 | # + When restarting debugger breakpoints/actions persist. | |
e22ea7cc | 745 | # + Buglet: When restarting debugger only one breakpoint/action per |
69893cff RGS |
746 | # autoloaded function persists. |
747 | # | |
36477c24 | 748 | # Changes: 0.97: NonStop will not stop in at_exit(). |
69893cff RGS |
749 | # + Option AutoTrace implemented. |
750 | # + Trace printed differently if frames are printed too. | |
751 | # + new `inhibitExit' option. | |
752 | # + printing of a very long statement interruptible. | |
1d06cb2d | 753 | # Changes: 0.98: New command `m' for printing possible methods |
69893cff RGS |
754 | # + 'l -' is a synonym for `-'. |
755 | # + Cosmetic bugs in printing stack trace. | |
756 | # + `frame' & 8 to print "expanded args" in stack trace. | |
757 | # + Can list/break in imported subs. | |
758 | # + new `maxTraceLen' option. | |
759 | # + frame & 4 and frame & 8 granted. | |
760 | # + new command `m' | |
761 | # + nonstoppable lines do not have `:' near the line number. | |
762 | # + `b compile subname' implemented. | |
763 | # + Will not use $` any more. | |
764 | # + `-' behaves sane now. | |
477ea2b1 | 765 | # Changes: 0.99: Completion for `f', `m'. |
69893cff RGS |
766 | # + `m' will remove duplicate names instead of duplicate functions. |
767 | # + `b load' strips trailing whitespace. | |
768 | # completion ignores leading `|'; takes into account current package | |
769 | # when completing a subroutine name (same for `l'). | |
055fd3a9 GS |
770 | # Changes: 1.07: Many fixed by tchrist 13-March-2000 |
771 | # BUG FIXES: | |
04e43a21 | 772 | # + Added bare minimal security checks on perldb rc files, plus |
055fd3a9 GS |
773 | # comments on what else is needed. |
774 | # + Fixed the ornaments that made "|h" completely unusable. | |
775 | # They are not used in print_help if they will hurt. Strip pod | |
776 | # if we're paging to less. | |
777 | # + Fixed mis-formatting of help messages caused by ornaments | |
e22ea7cc RF |
778 | # to restore Larry's original formatting. |
779 | # + Fixed many other formatting errors. The code is still suboptimal, | |
04e43a21 | 780 | # and needs a lot of work at restructuring. It's also misindented |
055fd3a9 GS |
781 | # in many places. |
782 | # + Fixed bug where trying to look at an option like your pager | |
e22ea7cc | 783 | # shows "1". |
055fd3a9 GS |
784 | # + Fixed some $? processing. Note: if you use csh or tcsh, you will |
785 | # lose. You should consider shell escapes not using their shell, | |
786 | # or else not caring about detailed status. This should really be | |
787 | # unified into one place, too. | |
788 | # + Fixed bug where invisible trailing whitespace on commands hoses you, | |
04e43a21 | 789 | # tricking Perl into thinking you weren't calling a debugger command! |
055fd3a9 GS |
790 | # + Fixed bug where leading whitespace on commands hoses you. (One |
791 | # suggests a leading semicolon or any other irrelevant non-whitespace | |
792 | # to indicate literal Perl code.) | |
793 | # + Fixed bugs that ate warnings due to wrong selected handle. | |
794 | # + Fixed a precedence bug on signal stuff. | |
795 | # + Fixed some unseemly wording. | |
796 | # + Fixed bug in help command trying to call perl method code. | |
797 | # + Fixed to call dumpvar from exception handler. SIGPIPE killed us. | |
798 | # ENHANCEMENTS: | |
799 | # + Added some comments. This code is still nasty spaghetti. | |
800 | # + Added message if you clear your pre/post command stacks which was | |
801 | # very easy to do if you just typed a bare >, <, or {. (A command | |
802 | # without an argument should *never* be a destructive action; this | |
803 | # API is fundamentally screwed up; likewise option setting, which | |
804 | # is equally buggered.) | |
805 | # + Added command stack dump on argument of "?" for >, <, or {. | |
806 | # + Added a semi-built-in doc viewer command that calls man with the | |
807 | # proper %Config::Config path (and thus gets caching, man -k, etc), | |
808 | # or else perldoc on obstreperous platforms. | |
809 | # + Added to and rearranged the help information. | |
810 | # + Detected apparent misuse of { ... } to declare a block; this used | |
811 | # to work but now is a command, and mysteriously gave no complaint. | |
04e43a21 DL |
812 | # |
813 | # Changes: 1.08: Apr 25, 2001 Jon Eveland <jweveland@yahoo.com> | |
814 | # BUG FIX: | |
815 | # + This patch to perl5db.pl cleans up formatting issues on the help | |
816 | # summary (h h) screen in the debugger. Mostly columnar alignment | |
817 | # issues, plus converted the printed text to use all spaces, since | |
818 | # tabs don't seem to help much here. | |
819 | # | |
820 | # Changes: 1.09: May 19, 2001 Ilya Zakharevich <ilya@math.ohio-state.edu> | |
69893cff RGS |
821 | # Minor bugs corrected; |
822 | # + Support for auto-creation of new TTY window on startup, either | |
823 | # unconditionally, or if started as a kid of another debugger session; | |
824 | # + New `O'ption CreateTTY | |
825 | # I<CreateTTY> bits control attempts to create a new TTY on events: | |
e22ea7cc | 826 | # 1: on fork() |
69893cff RGS |
827 | # 2: debugger is started inside debugger |
828 | # 4: on startup | |
829 | # + Code to auto-create a new TTY window on OS/2 (currently one | |
830 | # extra window per session - need named pipes to have more...); | |
831 | # + Simplified interface for custom createTTY functions (with a backward | |
832 | # compatibility hack); now returns the TTY name to use; return of '' | |
833 | # means that the function reset the I/O handles itself; | |
834 | # + Better message on the semantic of custom createTTY function; | |
835 | # + Convert the existing code to create a TTY into a custom createTTY | |
836 | # function; | |
837 | # + Consistent support for TTY names of the form "TTYin,TTYout"; | |
838 | # + Switch line-tracing output too to the created TTY window; | |
839 | # + make `b fork' DWIM with CORE::GLOBAL::fork; | |
840 | # + High-level debugger API cmd_*(): | |
04e43a21 DL |
841 | # cmd_b_load($filenamepart) # b load filenamepart |
842 | # cmd_b_line($lineno [, $cond]) # b lineno [cond] | |
843 | # cmd_b_sub($sub [, $cond]) # b sub [cond] | |
844 | # cmd_stop() # Control-C | |
492652be | 845 | # cmd_d($lineno) # d lineno (B) |
04e43a21 DL |
846 | # The cmd_*() API returns FALSE on failure; in this case it outputs |
847 | # the error message to the debugging output. | |
69893cff | 848 | # + Low-level debugger API |
04e43a21 DL |
849 | # break_on_load($filename) # b load filename |
850 | # @files = report_break_on_load() # List files with load-breakpoints | |
851 | # breakable_line_in_filename($name, $from [, $to]) | |
852 | # # First breakable line in the | |
853 | # # range $from .. $to. $to defaults | |
e22ea7cc | 854 | # # to $from, and may be less than |
69893cff | 855 | # # $to |
04e43a21 DL |
856 | # breakable_line($from [, $to]) # Same for the current file |
857 | # break_on_filename_line($name, $lineno [, $cond]) | |
e22ea7cc | 858 | # # Set breakpoint,$cond defaults to |
69893cff | 859 | # # 1 |
04e43a21 DL |
860 | # break_on_filename_line_range($name, $from, $to [, $cond]) |
861 | # # As above, on the first | |
862 | # # breakable line in range | |
863 | # break_on_line($lineno [, $cond]) # As above, in the current file | |
864 | # break_subroutine($sub [, $cond]) # break on the first breakable line | |
865 | # ($name, $from, $to) = subroutine_filename_lines($sub) | |
866 | # # The range of lines of the text | |
867 | # The low-level API returns TRUE on success, and die()s on failure. | |
868 | # | |
869 | # Changes: 1.10: May 23, 2001 Daniel Lewart <d-lewart@uiuc.edu> | |
870 | # BUG FIXES: | |
871 | # + Fixed warnings generated by "perl -dWe 42" | |
872 | # + Corrected spelling errors | |
873 | # + Squeezed Help (h) output into 80 columns | |
600d99fa DL |
874 | # |
875 | # Changes: 1.11: May 24, 2001 David Dyck <dcd@tc.fluke.com> | |
876 | # + Made "x @INC" work like it used to | |
877 | # | |
878 | # Changes: 1.12: May 24, 2001 Daniel Lewart <d-lewart@uiuc.edu> | |
879 | # + Fixed warnings generated by "O" (Show debugger options) | |
880 | # + Fixed warnings generated by "p 42" (Print expression) | |
6f891d7d | 881 | # Changes: 1.13: Jun 19, 2001 Scott.L.Miller@compaq.com |
e22ea7cc | 882 | # + Added windowSize option |
2f7e9187 MS |
883 | # Changes: 1.14: Oct 9, 2001 multiple |
884 | # + Clean up after itself on VMS (Charles Lane in 12385) | |
885 | # + Adding "@ file" syntax (Peter Scott in 12014) | |
886 | # + Debug reloading selfloaded stuff (Ilya Zakharevich in 11457) | |
887 | # + $^S and other debugger fixes (Ilya Zakharevich in 11120) | |
888 | # + Forgot a my() declaration (Ilya Zakharevich in 11085) | |
889 | # Changes: 1.15: Nov 6, 2001 Michael G Schwern <schwern@pobox.com> | |
890 | # + Updated 1.14 change log | |
891 | # + Added *dbline explainatory comments | |
892 | # + Mentioning perldebguts man page | |
492652be | 893 | # Changes: 1.16: Feb 15, 2002 Mark-Jason Dominus <mjd@plover.com> |
69893cff | 894 | # + $onetimeDump improvements |
492652be RF |
895 | # Changes: 1.17: Feb 20, 2002 Richard Foley <richard.foley@rfi.net> |
896 | # Moved some code to cmd_[.]()'s for clarity and ease of handling, | |
e22ea7cc RF |
897 | # rationalised the following commands and added cmd_wrapper() to |
898 | # enable switching between old and frighteningly consistent new | |
492652be RF |
899 | # behaviours for diehards: 'o CommandSet=pre580' (sigh...) |
900 | # a(add), A(del) # action expr (added del by line) | |
901 | # + b(add), B(del) # break [line] (was b,D) | |
e22ea7cc | 902 | # + w(add), W(del) # watch expr (was W,W) |
69893cff | 903 | # # added del by expr |
492652be RF |
904 | # + h(summary), h h(long) # help (hh) (was h h,h) |
905 | # + m(methods), M(modules) # ... (was m,v) | |
906 | # + o(option) # lc (was O) | |
907 | # + v(view code), V(view Variables) # ... (was w,V) | |
aef14ef9 RF |
908 | # Changes: 1.18: Mar 17, 2002 Richard Foley <richard.foley@rfi.net> |
909 | # + fixed missing cmd_O bug | |
471505cc SB |
910 | # Changes: 1.19: Mar 29, 2002 Spider Boardman |
911 | # + Added missing local()s -- DB::DB is called recursively. | |
35408c4e RF |
912 | # Changes: 1.20: Feb 17, 2003 Richard Foley <richard.foley@rfi.net> |
913 | # + pre'n'post commands no longer trashed with no args | |
914 | # + watch val joined out of eval() | |
69893cff RGS |
915 | # Changes: 1.21: Jun 04, 2003 Joe McMahon <mcmahon@ibiblio.org> |
916 | # + Added comments and reformatted source. No bug fixes/enhancements. | |
917 | # + Includes cleanup by Robin Barker and Jarkko Hietaniemi. | |
918 | # Changes: 1.22 Jun 09, 2003 Alex Vandiver <alexmv@MIT.EDU> | |
919 | # + Flush stdout/stderr before the debugger prompt is printed. | |
920 | # Changes: 1.23: Dec 21, 2003 Dominique Quatravaux | |
de5e1a3d | 921 | # + Fix a side-effect of bug #24674 in the perl debugger ("odd taint bug") |
e219e2fb RF |
922 | # Changes: 1.24: Mar 03, 2004 Richard Foley <richard.foley@rfi.net> |
923 | # + Added command to save all debugger commands for sourcing later. | |
3c4b39be | 924 | # + Added command to display parent inheritance tree of given class. |
e219e2fb | 925 | # + Fixed minor newline in history bug. |
e22ea7cc RF |
926 | # Changes: 1.25: Apr 17, 2004 Richard Foley <richard.foley@rfi.net> |
927 | # + Fixed option bug (setting invalid options + not recognising valid short forms) | |
928 | # Changes: 1.26: Apr 22, 2004 Richard Foley <richard.foley@rfi.net> | |
929 | # + unfork the 5.8.x and 5.9.x debuggers. | |
930 | # + whitespace and assertions call cleanup across versions | |
931 | # + H * deletes (resets) history | |
932 | # + i now handles Class + blessed objects | |
7fddc82f RF |
933 | # Changes: 1.27: May 09, 2004 Richard Foley <richard.foley@rfi.net> |
934 | # + updated pod page references - clunky. | |
935 | # + removed windowid restriction for forking into an xterm. | |
936 | # + more whitespace again. | |
937 | # + wrapped restart and enabled rerun [-n] (go back n steps) command. | |
2cbb2ee1 RGS |
938 | # Changes: 1.28: Oct 12, 2004 Richard Foley <richard.foley@rfi.net> |
939 | # + Added threads support (inc. e and E commands) | |
6fae1ad7 RF |
940 | # Changes: 1.29: Nov 28, 2006 Bo Lindbergh <blgl@hagernas.com> |
941 | # + Added macosx_get_fork_TTY support | |
5561b870 A |
942 | # Changes: 1.30: Mar 06, 2007 Andreas Koenig <andk@cpan.org> |
943 | # + Added HistFile, HistSize | |
6fae1ad7 | 944 | ######################################################################## |
d338d6fe | 945 | |
69893cff RGS |
946 | =head1 DEBUGGER INITIALIZATION |
947 | ||
948 | The debugger starts up in phases. | |
949 | ||
950 | =head2 BASIC SETUP | |
951 | ||
952 | First, it initializes the environment it wants to run in: turning off | |
953 | warnings during its own compilation, defining variables which it will need | |
954 | to avoid warnings later, setting itself up to not exit when the program | |
955 | terminates, and defaulting to printing return values for the C<r> command. | |
956 | ||
957 | =cut | |
958 | ||
eda6e075 | 959 | # Needed for the statement after exec(): |
69893cff RGS |
960 | # |
961 | # This BEGIN block is simply used to switch off warnings during debugger | |
962 | # compiliation. Probably it would be better practice to fix the warnings, | |
963 | # but this is how it's done at the moment. | |
eda6e075 | 964 | |
e22ea7cc RF |
965 | BEGIN { |
966 | $ini_warn = $^W; | |
967 | $^W = 0; | |
968 | } # Switch compilation warnings off until another BEGIN. | |
d12a4851 | 969 | |
69893cff RGS |
970 | local ($^W) = 0; # Switch run-time warnings off during init. |
971 | ||
2cbb2ee1 RGS |
972 | =head2 THREADS SUPPORT |
973 | ||
974 | If we are running under a threaded Perl, we require threads and threads::shared | |
975 | if the environment variable C<PERL5DB_THREADED> is set, to enable proper | |
976 | threaded debugger control. C<-dt> can also be used to set this. | |
977 | ||
978 | Each new thread will be announced and the debugger prompt will always inform | |
979 | you of each new thread created. It will also indicate the thread id in which | |
980 | we are currently running within the prompt like this: | |
981 | ||
982 | [tid] DB<$i> | |
983 | ||
984 | Where C<[tid]> is an integer thread id and C<$i> is the familiar debugger | |
985 | command prompt. The prompt will show: C<[0]> when running under threads, but | |
986 | not actually in a thread. C<[tid]> is consistent with C<gdb> usage. | |
987 | ||
988 | While running under threads, when you set or delete a breakpoint (etc.), this | |
989 | will apply to all threads, not just the currently running one. When you are | |
990 | in a currently executing thread, you will stay there until it completes. With | |
991 | the current implementation it is not currently possible to hop from one thread | |
992 | to another. | |
993 | ||
994 | The C<e> and C<E> commands are currently fairly minimal - see C<h e> and C<h E>. | |
995 | ||
996 | Note that threading support was built into the debugger as of Perl version | |
997 | C<5.8.6> and debugger version C<1.2.8>. | |
998 | ||
999 | =cut | |
1000 | ||
1001 | BEGIN { | |
1002 | # ensure we can share our non-threaded variables or no-op | |
1003 | if ($ENV{PERL5DB_THREADED}) { | |
1004 | require threads; | |
1005 | require threads::shared; | |
1006 | import threads::shared qw(share); | |
1007 | $DBGR; | |
1008 | share(\$DBGR); | |
1009 | lock($DBGR); | |
1010 | print "Threads support enabled\n"; | |
1011 | } else { | |
1012 | *lock = sub(*) {}; | |
1013 | *share = sub(*) {}; | |
1014 | } | |
1015 | } | |
1016 | ||
69893cff RGS |
1017 | # This would probably be better done with "use vars", but that wasn't around |
1018 | # when this code was originally written. (Neither was "use strict".) And on | |
1019 | # the principle of not fiddling with something that was working, this was | |
1020 | # left alone. | |
1021 | warn( # Do not ;-) | |
2cbb2ee1 | 1022 | # These variables control the execution of 'dumpvar.pl'. |
69893cff RGS |
1023 | $dumpvar::hashDepth, |
1024 | $dumpvar::arrayDepth, | |
1025 | $dumpvar::dumpDBFiles, | |
1026 | $dumpvar::dumpPackages, | |
1027 | $dumpvar::quoteHighBit, | |
1028 | $dumpvar::printUndef, | |
1029 | $dumpvar::globPrint, | |
1030 | $dumpvar::usageOnly, | |
1031 | ||
1032 | # used to save @ARGV and extract any debugger-related flags. | |
1033 | @ARGS, | |
1034 | ||
1035 | # used to control die() reporting in diesignal() | |
1036 | $Carp::CarpLevel, | |
1037 | ||
1038 | # used to prevent multiple entries to diesignal() | |
1039 | # (if for instance diesignal() itself dies) | |
1040 | $panic, | |
1041 | ||
1042 | # used to prevent the debugger from running nonstop | |
1043 | # after a restart | |
1044 | $second_time, | |
1045 | ) | |
1046 | if 0; | |
d338d6fe | 1047 | |
2cbb2ee1 RGS |
1048 | foreach my $k (keys (%INC)) { |
1049 | &share(\$main::{'_<'.$filename}); | |
1050 | }; | |
1051 | ||
54d04a52 | 1052 | # Command-line + PERLLIB: |
69893cff | 1053 | # Save the contents of @INC before they are modified elsewhere. |
54d04a52 IZ |
1054 | @ini_INC = @INC; |
1055 | ||
69893cff RGS |
1056 | # This was an attempt to clear out the previous values of various |
1057 | # trapped errors. Apparently it didn't help. XXX More info needed! | |
d338d6fe | 1058 | # $prevwarn = $prevdie = $prevbus = $prevsegv = ''; # Does not help?! |
1059 | ||
69893cff RGS |
1060 | # We set these variables to safe values. We don't want to blindly turn |
1061 | # off warnings, because other packages may still want them. | |
e22ea7cc RF |
1062 | $trace = $signal = $single = 0; # Uninitialized warning suppression |
1063 | # (local $^W cannot help - other packages!). | |
69893cff RGS |
1064 | |
1065 | # Default to not exiting when program finishes; print the return | |
1066 | # value when the 'r' command is used to return from a subroutine. | |
55497cff | 1067 | $inhibit_exit = $option{PrintRet} = 1; |
d338d6fe | 1068 | |
69893cff RGS |
1069 | =head1 OPTION PROCESSING |
1070 | ||
1071 | The debugger's options are actually spread out over the debugger itself and | |
1072 | C<dumpvar.pl>; some of these are variables to be set, while others are | |
1073 | subs to be called with a value. To try to make this a little easier to | |
1074 | manage, the debugger uses a few data structures to define what options | |
1075 | are legal and how they are to be processed. | |
1076 | ||
1077 | First, the C<@options> array defines the I<names> of all the options that | |
1078 | are to be accepted. | |
1079 | ||
1080 | =cut | |
1081 | ||
1082 | @options = qw( | |
5561b870 | 1083 | CommandSet HistFile HistSize |
e22ea7cc RF |
1084 | hashDepth arrayDepth dumpDepth |
1085 | DumpDBFiles DumpPackages DumpReused | |
1086 | compactDump veryCompact quote | |
1087 | HighBit undefPrint globPrint | |
1088 | PrintRet UsageOnly frame | |
1089 | AutoTrace TTY noTTY | |
1090 | ReadLine NonStop LineInfo | |
1091 | maxTraceLen recallCommand ShellBang | |
1092 | pager tkRunning ornaments | |
1093 | signalLevel warnLevel dieLevel | |
1094 | inhibit_exit ImmediateStop bareStringify | |
1095 | CreateTTY RemotePort windowSize | |
584420f0 | 1096 | DollarCaretP |
e22ea7cc | 1097 | ); |
d12a4851 | 1098 | |
584420f0 | 1099 | @RememberOnROptions = qw(DollarCaretP); |
d12a4851 | 1100 | |
69893cff RGS |
1101 | =pod |
1102 | ||
1103 | Second, C<optionVars> lists the variables that each option uses to save its | |
1104 | state. | |
1105 | ||
1106 | =cut | |
1107 | ||
1108 | %optionVars = ( | |
e22ea7cc RF |
1109 | hashDepth => \$dumpvar::hashDepth, |
1110 | arrayDepth => \$dumpvar::arrayDepth, | |
1111 | CommandSet => \$CommandSet, | |
1112 | DumpDBFiles => \$dumpvar::dumpDBFiles, | |
1113 | DumpPackages => \$dumpvar::dumpPackages, | |
1114 | DumpReused => \$dumpvar::dumpReused, | |
1115 | HighBit => \$dumpvar::quoteHighBit, | |
1116 | undefPrint => \$dumpvar::printUndef, | |
1117 | globPrint => \$dumpvar::globPrint, | |
1118 | UsageOnly => \$dumpvar::usageOnly, | |
1119 | CreateTTY => \$CreateTTY, | |
1120 | bareStringify => \$dumpvar::bareStringify, | |
1121 | frame => \$frame, | |
1122 | AutoTrace => \$trace, | |
1123 | inhibit_exit => \$inhibit_exit, | |
1124 | maxTraceLen => \$maxtrace, | |
1125 | ImmediateStop => \$ImmediateStop, | |
1126 | RemotePort => \$remoteport, | |
1127 | windowSize => \$window, | |
5561b870 A |
1128 | HistFile => \$histfile, |
1129 | HistSize => \$histsize, | |
69893cff RGS |
1130 | ); |
1131 | ||
1132 | =pod | |
1133 | ||
1134 | Third, C<%optionAction> defines the subroutine to be called to process each | |
1135 | option. | |
1136 | ||
1137 | =cut | |
1138 | ||
1139 | %optionAction = ( | |
1140 | compactDump => \&dumpvar::compactDump, | |
1141 | veryCompact => \&dumpvar::veryCompact, | |
1142 | quote => \&dumpvar::quote, | |
1143 | TTY => \&TTY, | |
1144 | noTTY => \&noTTY, | |
1145 | ReadLine => \&ReadLine, | |
1146 | NonStop => \&NonStop, | |
1147 | LineInfo => \&LineInfo, | |
1148 | recallCommand => \&recallCommand, | |
1149 | ShellBang => \&shellBang, | |
1150 | pager => \&pager, | |
1151 | signalLevel => \&signalLevel, | |
1152 | warnLevel => \&warnLevel, | |
1153 | dieLevel => \&dieLevel, | |
1154 | tkRunning => \&tkRunning, | |
1155 | ornaments => \&ornaments, | |
1156 | RemotePort => \&RemotePort, | |
1157 | DollarCaretP => \&DollarCaretP, | |
d12a4851 JH |
1158 | ); |
1159 | ||
69893cff RGS |
1160 | =pod |
1161 | ||
1162 | Last, the C<%optionRequire> notes modules that must be C<require>d if an | |
1163 | option is used. | |
1164 | ||
1165 | =cut | |
d338d6fe | 1166 | |
69893cff RGS |
1167 | # Note that this list is not complete: several options not listed here |
1168 | # actually require that dumpvar.pl be loaded for them to work, but are | |
1169 | # not in the table. A subsequent patch will correct this problem; for | |
1170 | # the moment, we're just recommenting, and we are NOT going to change | |
1171 | # function. | |
eda6e075 | 1172 | %optionRequire = ( |
69893cff RGS |
1173 | compactDump => 'dumpvar.pl', |
1174 | veryCompact => 'dumpvar.pl', | |
1175 | quote => 'dumpvar.pl', | |
e22ea7cc | 1176 | ); |
69893cff RGS |
1177 | |
1178 | =pod | |
1179 | ||
1180 | There are a number of initialization-related variables which can be set | |
1181 | by putting code to set them in a BEGIN block in the C<PERL5DB> environment | |
1182 | variable. These are: | |
1183 | ||
1184 | =over 4 | |
1185 | ||
1186 | =item C<$rl> - readline control XXX needs more explanation | |
1187 | ||
1188 | =item C<$warnLevel> - whether or not debugger takes over warning handling | |
1189 | ||
1190 | =item C<$dieLevel> - whether or not debugger takes over die handling | |
1191 | ||
1192 | =item C<$signalLevel> - whether or not debugger takes over signal handling | |
1193 | ||
1194 | =item C<$pre> - preprompt actions (array reference) | |
1195 | ||
1196 | =item C<$post> - postprompt actions (array reference) | |
1197 | ||
1198 | =item C<$pretype> | |
1199 | ||
1200 | =item C<$CreateTTY> - whether or not to create a new TTY for this debugger | |
1201 | ||
1202 | =item C<$CommandSet> - which command set to use (defaults to new, documented set) | |
1203 | ||
1204 | =back | |
1205 | ||
1206 | =cut | |
d338d6fe | 1207 | |
1208 | # These guys may be defined in $ENV{PERL5DB} : | |
69893cff RGS |
1209 | $rl = 1 unless defined $rl; |
1210 | $warnLevel = 1 unless defined $warnLevel; | |
1211 | $dieLevel = 1 unless defined $dieLevel; | |
1212 | $signalLevel = 1 unless defined $signalLevel; | |
1213 | $pre = [] unless defined $pre; | |
1214 | $post = [] unless defined $post; | |
1215 | $pretype = [] unless defined $pretype; | |
1216 | $CreateTTY = 3 unless defined $CreateTTY; | |
1217 | $CommandSet = '580' unless defined $CommandSet; | |
1218 | ||
2cbb2ee1 RGS |
1219 | share($rl); |
1220 | share($warnLevel); | |
1221 | share($dieLevel); | |
1222 | share($signalLevel); | |
1223 | share($pre); | |
1224 | share($post); | |
1225 | share($pretype); | |
1226 | share($rl); | |
1227 | share($CreateTTY); | |
1228 | share($CommandSet); | |
1229 | ||
69893cff RGS |
1230 | =pod |
1231 | ||
1232 | The default C<die>, C<warn>, and C<signal> handlers are set up. | |
1233 | ||
1234 | =cut | |
055fd3a9 | 1235 | |
d338d6fe | 1236 | warnLevel($warnLevel); |
1237 | dieLevel($dieLevel); | |
1238 | signalLevel($signalLevel); | |
055fd3a9 | 1239 | |
69893cff RGS |
1240 | =pod |
1241 | ||
1242 | The pager to be used is needed next. We try to get it from the | |
5561b870 | 1243 | environment first. If it's not defined there, we try to find it in |
69893cff RGS |
1244 | the Perl C<Config.pm>. If it's not there, we default to C<more>. We |
1245 | then call the C<pager()> function to save the pager name. | |
1246 | ||
1247 | =cut | |
1248 | ||
1249 | # This routine makes sure $pager is set up so that '|' can use it. | |
4865a36d | 1250 | pager( |
e22ea7cc | 1251 | |
69893cff | 1252 | # If PAGER is defined in the environment, use it. |
e22ea7cc RF |
1253 | defined $ENV{PAGER} |
1254 | ? $ENV{PAGER} | |
69893cff RGS |
1255 | |
1256 | # If not, see if Config.pm defines it. | |
e22ea7cc RF |
1257 | : eval { require Config } |
1258 | && defined $Config::Config{pager} | |
1259 | ? $Config::Config{pager} | |
69893cff RGS |
1260 | |
1261 | # If not, fall back to 'more'. | |
e22ea7cc RF |
1262 | : 'more' |
1263 | ) | |
1264 | unless defined $pager; | |
69893cff RGS |
1265 | |
1266 | =pod | |
1267 | ||
1268 | We set up the command to be used to access the man pages, the command | |
be9a9b1d AT |
1269 | recall character (C<!> unless otherwise defined) and the shell escape |
1270 | character (C<!> unless otherwise defined). Yes, these do conflict, and | |
69893cff RGS |
1271 | neither works in the debugger at the moment. |
1272 | ||
1273 | =cut | |
1274 | ||
055fd3a9 | 1275 | setman(); |
69893cff RGS |
1276 | |
1277 | # Set up defaults for command recall and shell escape (note: | |
1278 | # these currently don't work in linemode debugging). | |
d338d6fe | 1279 | &recallCommand("!") unless defined $prc; |
69893cff RGS |
1280 | &shellBang("!") unless defined $psh; |
1281 | ||
1282 | =pod | |
1283 | ||
1284 | We then set up the gigantic string containing the debugger help. | |
1285 | We also set the limit on the number of arguments we'll display during a | |
1286 | trace. | |
1287 | ||
1288 | =cut | |
1289 | ||
04e43a21 | 1290 | sethelp(); |
69893cff RGS |
1291 | |
1292 | # If we didn't get a default for the length of eval/stack trace args, | |
1293 | # set it here. | |
1d06cb2d | 1294 | $maxtrace = 400 unless defined $maxtrace; |
69893cff RGS |
1295 | |
1296 | =head2 SETTING UP THE DEBUGGER GREETING | |
1297 | ||
be9a9b1d | 1298 | The debugger I<greeting> helps to inform the user how many debuggers are |
69893cff RGS |
1299 | running, and whether the current debugger is the primary or a child. |
1300 | ||
1301 | If we are the primary, we just hang onto our pid so we'll have it when | |
1302 | or if we start a child debugger. If we are a child, we'll set things up | |
1303 | so we'll have a unique greeting and so the parent will give us our own | |
1304 | TTY later. | |
1305 | ||
1306 | We save the current contents of the C<PERLDB_PIDS> environment variable | |
1307 | because we mess around with it. We'll also need to hang onto it because | |
1308 | we'll need it if we restart. | |
1309 | ||
1310 | Child debuggers make a label out of the current PID structure recorded in | |
1311 | PERLDB_PIDS plus the new PID. They also mark themselves as not having a TTY | |
1312 | yet so the parent will give them one later via C<resetterm()>. | |
1313 | ||
1314 | =cut | |
1315 | ||
e22ea7cc | 1316 | # Save the current contents of the environment; we're about to |
69893cff | 1317 | # much with it. We'll need this if we have to restart. |
f1583d8f | 1318 | $ini_pids = $ENV{PERLDB_PIDS}; |
69893cff | 1319 | |
e22ea7cc RF |
1320 | if ( defined $ENV{PERLDB_PIDS} ) { |
1321 | ||
69893cff | 1322 | # We're a child. Make us a label out of the current PID structure |
e22ea7cc | 1323 | # recorded in PERLDB_PIDS plus our (new) PID. Mark us as not having |
69893cff | 1324 | # a term yet so the parent will give us one later via resetterm(). |
55f4245e JM |
1325 | |
1326 | my $env_pids = $ENV{PERLDB_PIDS}; | |
1327 | $pids = "[$env_pids]"; | |
1328 | ||
1329 | # Unless we are on OpenVMS, all programs under the DCL shell run under | |
1330 | # the same PID. | |
1331 | ||
1332 | if (($^O eq 'VMS') && ($env_pids =~ /\b$$\b/)) { | |
1333 | $term_pid = $$; | |
1334 | } | |
1335 | else { | |
1336 | $ENV{PERLDB_PIDS} .= "->$$"; | |
1337 | $term_pid = -1; | |
1338 | } | |
1339 | ||
69893cff RGS |
1340 | } ## end if (defined $ENV{PERLDB_PIDS... |
1341 | else { | |
e22ea7cc RF |
1342 | |
1343 | # We're the parent PID. Initialize PERLDB_PID in case we end up with a | |
69893cff RGS |
1344 | # child debugger, and mark us as the parent, so we'll know to set up |
1345 | # more TTY's is we have to. | |
1346 | $ENV{PERLDB_PIDS} = "$$"; | |
619a0444 | 1347 | $pids = "[pid=$$]"; |
e22ea7cc | 1348 | $term_pid = $$; |
f1583d8f | 1349 | } |
69893cff | 1350 | |
f1583d8f | 1351 | $pidprompt = ''; |
69893cff RGS |
1352 | |
1353 | # Sets up $emacs as a synonym for $slave_editor. | |
1354 | *emacs = $slave_editor if $slave_editor; # May be used in afterinit()... | |
1355 | ||
1356 | =head2 READING THE RC FILE | |
1357 | ||
1358 | The debugger will read a file of initialization options if supplied. If | |
1359 | running interactively, this is C<.perldb>; if not, it's C<perldb.ini>. | |
1360 | ||
1361 | =cut | |
1362 | ||
1363 | # As noted, this test really doesn't check accurately that the debugger | |
1364 | # is running at a terminal or not. | |
d338d6fe | 1365 | |
98274836 JM |
1366 | my $dev_tty = '/dev/tty'; |
1367 | $dev_tty = 'TT:' if ($^O eq 'VMS'); | |
1368 | if ( -e $dev_tty ) { # this is the wrong metric! | |
e22ea7cc RF |
1369 | $rcfile = ".perldb"; |
1370 | } | |
69893cff RGS |
1371 | else { |
1372 | $rcfile = "perldb.ini"; | |
d338d6fe | 1373 | } |
1374 | ||
69893cff RGS |
1375 | =pod |
1376 | ||
1377 | The debugger does a safety test of the file to be read. It must be owned | |
1378 | either by the current user or root, and must only be writable by the owner. | |
1379 | ||
1380 | =cut | |
1381 | ||
1382 | # This wraps a safety test around "do" to read and evaluate the init file. | |
1383 | # | |
055fd3a9 GS |
1384 | # This isn't really safe, because there's a race |
1385 | # between checking and opening. The solution is to | |
1386 | # open and fstat the handle, but then you have to read and | |
1387 | # eval the contents. But then the silly thing gets | |
69893cff RGS |
1388 | # your lexical scope, which is unfortunate at best. |
1389 | sub safe_do { | |
055fd3a9 GS |
1390 | my $file = shift; |
1391 | ||
1392 | # Just exactly what part of the word "CORE::" don't you understand? | |
69893cff RGS |
1393 | local $SIG{__WARN__}; |
1394 | local $SIG{__DIE__}; | |
055fd3a9 | 1395 | |
e22ea7cc | 1396 | unless ( is_safe_file($file) ) { |
69893cff | 1397 | CORE::warn <<EO_GRIPE; |
055fd3a9 GS |
1398 | perldb: Must not source insecure rcfile $file. |
1399 | You or the superuser must be the owner, and it must not | |
69893cff | 1400 | be writable by anyone but its owner. |
055fd3a9 | 1401 | EO_GRIPE |
69893cff RGS |
1402 | return; |
1403 | } ## end unless (is_safe_file($file... | |
055fd3a9 GS |
1404 | |
1405 | do $file; | |
1406 | CORE::warn("perldb: couldn't parse $file: $@") if $@; | |
69893cff | 1407 | } ## end sub safe_do |
055fd3a9 | 1408 | |
69893cff RGS |
1409 | # This is the safety test itself. |
1410 | # | |
055fd3a9 GS |
1411 | # Verifies that owner is either real user or superuser and that no |
1412 | # one but owner may write to it. This function is of limited use | |
1413 | # when called on a path instead of upon a handle, because there are | |
1414 | # no guarantees that filename (by dirent) whose file (by ino) is | |
e22ea7cc | 1415 | # eventually accessed is the same as the one tested. |
055fd3a9 GS |
1416 | # Assumes that the file's existence is not in doubt. |
1417 | sub is_safe_file { | |
1418 | my $path = shift; | |
69893cff | 1419 | stat($path) || return; # mysteriously vaporized |
e22ea7cc | 1420 | my ( $dev, $ino, $mode, $nlink, $uid, $gid ) = stat(_); |
055fd3a9 GS |
1421 | |
1422 | return 0 if $uid != 0 && $uid != $<; | |
1423 | return 0 if $mode & 022; | |
1424 | return 1; | |
69893cff | 1425 | } ## end sub is_safe_file |
055fd3a9 | 1426 | |
69893cff | 1427 | # If the rcfile (whichever one we decided was the right one to read) |
e22ea7cc RF |
1428 | # exists, we safely do it. |
1429 | if ( -f $rcfile ) { | |
055fd3a9 | 1430 | safe_do("./$rcfile"); |
69893cff | 1431 | } |
e22ea7cc | 1432 | |
69893cff | 1433 | # If there isn't one here, try the user's home directory. |
e22ea7cc | 1434 | elsif ( defined $ENV{HOME} && -f "$ENV{HOME}/$rcfile" ) { |
055fd3a9 GS |
1435 | safe_do("$ENV{HOME}/$rcfile"); |
1436 | } | |
e22ea7cc | 1437 | |
69893cff | 1438 | # Else try the login directory. |
e22ea7cc | 1439 | elsif ( defined $ENV{LOGDIR} && -f "$ENV{LOGDIR}/$rcfile" ) { |
055fd3a9 | 1440 | safe_do("$ENV{LOGDIR}/$rcfile"); |
d338d6fe | 1441 | } |
1442 | ||
69893cff | 1443 | # If the PERLDB_OPTS variable has options in it, parse those out next. |
e22ea7cc RF |
1444 | if ( defined $ENV{PERLDB_OPTS} ) { |
1445 | parse_options( $ENV{PERLDB_OPTS} ); | |
d338d6fe | 1446 | } |
1447 | ||
69893cff RGS |
1448 | =pod |
1449 | ||
1450 | The last thing we do during initialization is determine which subroutine is | |
1451 | to be used to obtain a new terminal when a new debugger is started. Right now, | |
6fae1ad7 | 1452 | the debugger only handles X Windows, OS/2, and Mac OS X (darwin). |
69893cff RGS |
1453 | |
1454 | =cut | |
1455 | ||
1456 | # Set up the get_fork_TTY subroutine to be aliased to the proper routine. | |
1457 | # Works if you're running an xterm or xterm-like window, or you're on | |
6fae1ad7 RF |
1458 | # OS/2, or on Mac OS X. This may need some expansion. |
1459 | ||
1460 | if (not defined &get_fork_TTY) # only if no routine exists | |
69893cff | 1461 | { |
6fae1ad7 RF |
1462 | if (defined $ENV{TERM} # If we know what kind |
1463 | # of terminal this is, | |
1464 | and $ENV{TERM} eq 'xterm' # and it's an xterm, | |
1465 | and defined $ENV{DISPLAY} # and what display it's on, | |
1466 | ) | |
1467 | { | |
1468 | *get_fork_TTY = \&xterm_get_fork_TTY; # use the xterm version | |
1469 | } | |
1470 | elsif ( $^O eq 'os2' ) { # If this is OS/2, | |
1471 | *get_fork_TTY = \&os2_get_fork_TTY; # use the OS/2 version | |
1472 | } | |
1473 | elsif ( $^O eq 'darwin' # If this is Mac OS X | |
1474 | and defined $ENV{TERM_PROGRAM} # and we're running inside | |
1475 | and $ENV{TERM_PROGRAM} | |
1476 | eq 'Apple_Terminal' # Terminal.app | |
1477 | ) | |
1478 | { | |
1479 | *get_fork_TTY = \&macosx_get_fork_TTY; # use the Mac OS X version | |
1480 | } | |
69893cff | 1481 | } ## end if (not defined &get_fork_TTY... |
e22ea7cc | 1482 | |
dbb46cec DQ |
1483 | # untaint $^O, which may have been tainted by the last statement. |
1484 | # see bug [perl #24674] | |
e22ea7cc RF |
1485 | $^O =~ m/^(.*)\z/; |
1486 | $^O = $1; | |
f1583d8f | 1487 | |
d12a4851 | 1488 | # Here begin the unreadable code. It needs fixing. |
055fd3a9 | 1489 | |
69893cff RGS |
1490 | =head2 RESTART PROCESSING |
1491 | ||
1492 | This section handles the restart command. When the C<R> command is invoked, it | |
1493 | tries to capture all of the state it can into environment variables, and | |
1494 | then sets C<PERLDB_RESTART>. When we start executing again, we check to see | |
1495 | if C<PERLDB_RESTART> is there; if so, we reload all the information that | |
1496 | the R command stuffed into the environment variables. | |
1497 | ||
1498 | PERLDB_RESTART - flag only, contains no restart data itself. | |
1499 | PERLDB_HIST - command history, if it's available | |
1500 | PERLDB_ON_LOAD - breakpoints set by the rc file | |
1501 | PERLDB_POSTPONE - subs that have been loaded/not executed, and have actions | |
1502 | PERLDB_VISITED - files that had breakpoints | |
1503 | PERLDB_FILE_... - breakpoints for a file | |
1504 | PERLDB_OPT - active options | |
1505 | PERLDB_INC - the original @INC | |
1506 | PERLDB_PRETYPE - preprompt debugger actions | |
1507 | PERLDB_PRE - preprompt Perl code | |
1508 | PERLDB_POST - post-prompt Perl code | |
1509 | PERLDB_TYPEAHEAD - typeahead captured by readline() | |
1510 | ||
1511 | We chug through all these variables and plug the values saved in them | |
1512 | back into the appropriate spots in the debugger. | |
1513 | ||
1514 | =cut | |
1515 | ||
e22ea7cc RF |
1516 | if ( exists $ENV{PERLDB_RESTART} ) { |
1517 | ||
69893cff | 1518 | # We're restarting, so we don't need the flag that says to restart anymore. |
e22ea7cc RF |
1519 | delete $ENV{PERLDB_RESTART}; |
1520 | ||
1521 | # $restart = 1; | |
1522 | @hist = get_list('PERLDB_HIST'); | |
1523 | %break_on_load = get_list("PERLDB_ON_LOAD"); | |
1524 | %postponed = get_list("PERLDB_POSTPONE"); | |
69893cff | 1525 | |
2cbb2ee1 RGS |
1526 | share(@hist); |
1527 | share(@truehist); | |
1528 | share(%break_on_load); | |
1529 | share(%postponed); | |
1530 | ||
69893cff | 1531 | # restore breakpoints/actions |
e22ea7cc RF |
1532 | my @had_breakpoints = get_list("PERLDB_VISITED"); |
1533 | for ( 0 .. $#had_breakpoints ) { | |
1534 | my %pf = get_list("PERLDB_FILE_$_"); | |
1535 | $postponed_file{ $had_breakpoints[$_] } = \%pf if %pf; | |
1536 | } | |
69893cff RGS |
1537 | |
1538 | # restore options | |
e22ea7cc RF |
1539 | my %opt = get_list("PERLDB_OPT"); |
1540 | my ( $opt, $val ); | |
1541 | while ( ( $opt, $val ) = each %opt ) { | |
1542 | $val =~ s/[\\\']/\\$1/g; | |
1543 | parse_options("$opt'$val'"); | |
1544 | } | |
69893cff RGS |
1545 | |
1546 | # restore original @INC | |
e22ea7cc RF |
1547 | @INC = get_list("PERLDB_INC"); |
1548 | @ini_INC = @INC; | |
1549 | ||
1550 | # return pre/postprompt actions and typeahead buffer | |
1551 | $pretype = [ get_list("PERLDB_PRETYPE") ]; | |
1552 | $pre = [ get_list("PERLDB_PRE") ]; | |
1553 | $post = [ get_list("PERLDB_POST") ]; | |
1554 | @typeahead = get_list( "PERLDB_TYPEAHEAD", @typeahead ); | |
69893cff RGS |
1555 | } ## end if (exists $ENV{PERLDB_RESTART... |
1556 | ||
1557 | =head2 SETTING UP THE TERMINAL | |
1558 | ||
1559 | Now, we'll decide how the debugger is going to interact with the user. | |
1560 | If there's no TTY, we set the debugger to run non-stop; there's not going | |
1561 | to be anyone there to enter commands. | |
1562 | ||
1563 | =cut | |
54d04a52 | 1564 | |
d338d6fe | 1565 | if ($notty) { |
69893cff | 1566 | $runnonstop = 1; |
2cbb2ee1 | 1567 | share($runnonstop); |
69893cff | 1568 | } |
d12a4851 | 1569 | |
69893cff RGS |
1570 | =pod |
1571 | ||
1572 | If there is a TTY, we have to determine who it belongs to before we can | |
1573 | proceed. If this is a slave editor or graphical debugger (denoted by | |
1574 | the first command-line switch being '-emacs'), we shift this off and | |
1575 | set C<$rl> to 0 (XXX ostensibly to do straight reads). | |
1576 | ||
1577 | =cut | |
1578 | ||
1579 | else { | |
e22ea7cc | 1580 | |
69893cff RGS |
1581 | # Is Perl being run from a slave editor or graphical debugger? |
1582 | # If so, don't use readline, and set $slave_editor = 1. | |
e22ea7cc RF |
1583 | $slave_editor = |
1584 | ( ( defined $main::ARGV[0] ) and ( $main::ARGV[0] eq '-emacs' ) ); | |
1585 | $rl = 0, shift(@main::ARGV) if $slave_editor; | |
1586 | ||
1587 | #require Term::ReadLine; | |
d12a4851 | 1588 | |
69893cff RGS |
1589 | =pod |
1590 | ||
1591 | We then determine what the console should be on various systems: | |
1592 | ||
1593 | =over 4 | |
1594 | ||
1595 | =item * Cygwin - We use C<stdin> instead of a separate device. | |
1596 | ||
1597 | =cut | |
1598 | ||
e22ea7cc RF |
1599 | if ( $^O eq 'cygwin' ) { |
1600 | ||
69893cff RGS |
1601 | # /dev/tty is binary. use stdin for textmode |
1602 | undef $console; | |
1603 | } | |
1604 | ||
1605 | =item * Unix - use C</dev/tty>. | |
1606 | ||
1607 | =cut | |
1608 | ||
e22ea7cc | 1609 | elsif ( -e "/dev/tty" ) { |
69893cff RGS |
1610 | $console = "/dev/tty"; |
1611 | } | |
1612 | ||
1613 | =item * Windows or MSDOS - use C<con>. | |
1614 | ||
1615 | =cut | |
1616 | ||
e22ea7cc | 1617 | elsif ( $^O eq 'dos' or -e "con" or $^O eq 'MSWin32' ) { |
69893cff RGS |
1618 | $console = "con"; |
1619 | } | |
1620 | ||
1621 | =item * MacOS - use C<Dev:Console:Perl Debug> if this is the MPW version; C<Dev: | |
be9a9b1d AT |
1622 | Console> if not. |
1623 | ||
1624 | Note that Mac OS X returns C<darwin>, not C<MacOS>. Also note that the debugger doesn't do anything special for C<darwin>. Maybe it should. | |
69893cff RGS |
1625 | |
1626 | =cut | |
1627 | ||
e22ea7cc RF |
1628 | elsif ( $^O eq 'MacOS' ) { |
1629 | if ( $MacPerl::Version !~ /MPW/ ) { | |
1630 | $console = | |
1631 | "Dev:Console:Perl Debug"; # Separate window for application | |
69893cff RGS |
1632 | } |
1633 | else { | |
1634 | $console = "Dev:Console"; | |
1635 | } | |
1636 | } ## end elsif ($^O eq 'MacOS') | |
1637 | ||
1638 | =item * VMS - use C<sys$command>. | |
1639 | ||
1640 | =cut | |
1641 | ||
1642 | else { | |
e22ea7cc | 1643 | |
69893cff RGS |
1644 | # everything else is ... |
1645 | $console = "sys\$command"; | |
d12a4851 | 1646 | } |
69893cff RGS |
1647 | |
1648 | =pod | |
1649 | ||
1650 | =back | |
1651 | ||
1652 | Several other systems don't use a specific console. We C<undef $console> | |
1653 | for those (Windows using a slave editor/graphical debugger, NetWare, OS/2 | |
1654 | with a slave editor, Epoc). | |
1655 | ||
1656 | =cut | |
d12a4851 | 1657 | |
e22ea7cc RF |
1658 | if ( ( $^O eq 'MSWin32' ) and ( $slave_editor or defined $ENV{EMACS} ) ) { |
1659 | ||
69893cff | 1660 | # /dev/tty is binary. use stdin for textmode |
e22ea7cc RF |
1661 | $console = undef; |
1662 | } | |
1663 | ||
1664 | if ( $^O eq 'NetWare' ) { | |
d12a4851 | 1665 | |
69893cff RGS |
1666 | # /dev/tty is binary. use stdin for textmode |
1667 | $console = undef; | |
1668 | } | |
d12a4851 | 1669 | |
69893cff RGS |
1670 | # In OS/2, we need to use STDIN to get textmode too, even though |
1671 | # it pretty much looks like Unix otherwise. | |
e22ea7cc RF |
1672 | if ( defined $ENV{OS2_SHELL} and ( $slave_editor or $ENV{WINDOWID} ) ) |
1673 | { # In OS/2 | |
1674 | $console = undef; | |
1675 | } | |
1676 | ||
1677 | # EPOC also falls into the 'got to use STDIN' camp. | |
1678 | if ( $^O eq 'epoc' ) { | |
1679 | $console = undef; | |
1680 | } | |
d12a4851 | 1681 | |
69893cff RGS |
1682 | =pod |
1683 | ||
1684 | If there is a TTY hanging around from a parent, we use that as the console. | |
1685 | ||
1686 | =cut | |
1687 | ||
e22ea7cc | 1688 | $console = $tty if defined $tty; |
d12a4851 | 1689 | |
69893cff RGS |
1690 | =head2 SOCKET HANDLING |
1691 | ||
1692 | The debugger is capable of opening a socket and carrying out a debugging | |
1693 | session over the socket. | |
1694 | ||
1695 | If C<RemotePort> was defined in the options, the debugger assumes that it | |
1696 | should try to start a debugging session on that port. It builds the socket | |
1697 | and then tries to connect the input and output filehandles to it. | |
1698 | ||
1699 | =cut | |
1700 | ||
1701 | # Handle socket stuff. | |
e22ea7cc RF |
1702 | |
1703 | if ( defined $remoteport ) { | |
1704 | ||
69893cff RGS |
1705 | # If RemotePort was defined in the options, connect input and output |
1706 | # to the socket. | |
e22ea7cc RF |
1707 | require IO::Socket; |
1708 | $OUT = new IO::Socket::INET( | |
1709 | Timeout => '10', | |
1710 | PeerAddr => $remoteport, | |
1711 | Proto => 'tcp', | |
69893cff | 1712 | ); |
e22ea7cc RF |
1713 | if ( !$OUT ) { die "Unable to connect to remote host: $remoteport\n"; } |
1714 | $IN = $OUT; | |
69893cff RGS |
1715 | } ## end if (defined $remoteport) |
1716 | ||
1717 | =pod | |
1718 | ||
1719 | If no C<RemotePort> was defined, and we want to create a TTY on startup, | |
1720 | this is probably a situation where multiple debuggers are running (for example, | |
1721 | a backticked command that starts up another debugger). We create a new IN and | |
1722 | OUT filehandle, and do the necessary mojo to create a new TTY if we know how | |
1723 | and if we can. | |
1724 | ||
1725 | =cut | |
1726 | ||
1727 | # Non-socket. | |
1728 | else { | |
e22ea7cc | 1729 | |
69893cff RGS |
1730 | # Two debuggers running (probably a system or a backtick that invokes |
1731 | # the debugger itself under the running one). create a new IN and OUT | |
e22ea7cc | 1732 | # filehandle, and do the necessary mojo to create a new tty if we |
69893cff | 1733 | # know how, and we can. |
e22ea7cc RF |
1734 | create_IN_OUT(4) if $CreateTTY & 4; |
1735 | if ($console) { | |
1736 | ||
69893cff | 1737 | # If we have a console, check to see if there are separate ins and |
cd1191f1 | 1738 | # outs to open. (They are assumed identical if not.) |
69893cff | 1739 | |
e22ea7cc RF |
1740 | my ( $i, $o ) = split /,/, $console; |
1741 | $o = $i unless defined $o; | |
69893cff | 1742 | |
69893cff | 1743 | # read/write on in, or just read, or read on STDIN. |
e22ea7cc RF |
1744 | open( IN, "+<$i" ) |
1745 | || open( IN, "<$i" ) | |
1746 | || open( IN, "<&STDIN" ); | |
1747 | ||
69893cff RGS |
1748 | # read/write/create/clobber out, or write/create/clobber out, |
1749 | # or merge with STDERR, or merge with STDOUT. | |
e22ea7cc RF |
1750 | open( OUT, "+>$o" ) |
1751 | || open( OUT, ">$o" ) | |
1752 | || open( OUT, ">&STDERR" ) | |
1753 | || open( OUT, ">&STDOUT" ); # so we don't dongle stdout | |
1754 | ||
1755 | } ## end if ($console) | |
1756 | elsif ( not defined $console ) { | |
1757 | ||
1758 | # No console. Open STDIN. | |
1759 | open( IN, "<&STDIN" ); | |
1760 | ||
1761 | # merge with STDERR, or with STDOUT. | |
1762 | open( OUT, ">&STDERR" ) | |
1763 | || open( OUT, ">&STDOUT" ); # so we don't dongle stdout | |
1764 | $console = 'STDIN/OUT'; | |
69893cff RGS |
1765 | } ## end elsif (not defined $console) |
1766 | ||
1767 | # Keep copies of the filehandles so that when the pager runs, it | |
1768 | # can close standard input without clobbering ours. | |
e22ea7cc RF |
1769 | $IN = \*IN, $OUT = \*OUT if $console or not defined $console; |
1770 | } ## end elsif (from if(defined $remoteport)) | |
1771 | ||
1772 | # Unbuffer DB::OUT. We need to see responses right away. | |
1773 | my $previous = select($OUT); | |
1774 | $| = 1; # for DB::OUT | |
1775 | select($previous); | |
1776 | ||
1777 | # Line info goes to debugger output unless pointed elsewhere. | |
1778 | # Pointing elsewhere makes it possible for slave editors to | |
1779 | # keep track of file and position. We have both a filehandle | |
1780 | # and a I/O description to keep track of. | |
1781 | $LINEINFO = $OUT unless defined $LINEINFO; | |
1782 | $lineinfo = $console unless defined $lineinfo; | |
2cbb2ee1 RGS |
1783 | # share($LINEINFO); # <- unable to share globs |
1784 | share($lineinfo); # | |
e22ea7cc | 1785 | |
69893cff RGS |
1786 | =pod |
1787 | ||
1788 | To finish initialization, we show the debugger greeting, | |
1789 | and then call the C<afterinit()> subroutine if there is one. | |
1790 | ||
1791 | =cut | |
d12a4851 | 1792 | |
e22ea7cc RF |
1793 | # Show the debugger greeting. |
1794 | $header =~ s/.Header: ([^,]+),v(\s+\S+\s+\S+).*$/$1$2/; | |
1795 | unless ($runnonstop) { | |
1796 | local $\ = ''; | |
1797 | local $, = ''; | |
1798 | if ( $term_pid eq '-1' ) { | |
1799 | print $OUT "\nDaughter DB session started...\n"; | |
1800 | } | |
1801 | else { | |
1802 | print $OUT "\nLoading DB routines from $header\n"; | |
1803 | print $OUT ( | |
1804 | "Editor support ", | |
1805 | $slave_editor ? "enabled" : "available", ".\n" | |
1806 | ); | |
1807 | print $OUT | |
69893cff RGS |
1808 | "\nEnter h or `h h' for help, or `$doccmd perldebug' for more help.\n\n"; |
1809 | } ## end else [ if ($term_pid eq '-1') | |
1810 | } ## end unless ($runnonstop) | |
1811 | } ## end else [ if ($notty) | |
1812 | ||
1813 | # XXX This looks like a bug to me. | |
1814 | # Why copy to @ARGS and then futz with @args? | |
d338d6fe | 1815 | @ARGS = @ARGV; |
1816 | for (@args) { | |
69893cff RGS |
1817 | # Make sure backslashes before single quotes are stripped out, and |
1818 | # keep args unless they are numeric (XXX why?) | |
e22ea7cc RF |
1819 | # s/\'/\\\'/g; # removed while not justified understandably |
1820 | # s/(.*)/'$1'/ unless /^-?[\d.]+$/; # ditto | |
d338d6fe | 1821 | } |
1822 | ||
e22ea7cc | 1823 | # If there was an afterinit() sub defined, call it. It will get |
69893cff | 1824 | # executed in our scope, so it can fiddle with debugger globals. |
e22ea7cc | 1825 | if ( defined &afterinit ) { # May be defined in $rcfile |
69893cff | 1826 | &afterinit(); |
d338d6fe | 1827 | } |
e22ea7cc | 1828 | |
69893cff | 1829 | # Inform us about "Stack dump during die enabled ..." in dieLevel(). |
43aed9ee IZ |
1830 | $I_m_init = 1; |
1831 | ||
d338d6fe | 1832 | ############################################################ Subroutines |
1833 | ||
69893cff RGS |
1834 | =head1 SUBROUTINES |
1835 | ||
1836 | =head2 DB | |
1837 | ||
1838 | This gigantic subroutine is the heart of the debugger. Called before every | |
1839 | statement, its job is to determine if a breakpoint has been reached, and | |
1840 | stop if so; read commands from the user, parse them, and execute | |
1841 | them, and hen send execution off to the next statement. | |
1842 | ||
1843 | Note that the order in which the commands are processed is very important; | |
1844 | some commands earlier in the loop will actually alter the C<$cmd> variable | |
be9a9b1d | 1845 | to create other commands to be executed later. This is all highly I<optimized> |
69893cff RGS |
1846 | but can be confusing. Check the comments for each C<$cmd ... && do {}> to |
1847 | see what's happening in any given command. | |
1848 | ||
1849 | =cut | |
1850 | ||
d338d6fe | 1851 | sub DB { |
69893cff | 1852 | |
2cbb2ee1 RGS |
1853 | # lock the debugger and get the thread id for the prompt |
1854 | lock($DBGR); | |
1855 | my $tid; | |
1856 | if ($ENV{PERL5DB_THREADED}) { | |
878090d5 | 1857 | $tid = eval { "[".threads->tid."]" }; |
2cbb2ee1 RGS |
1858 | } |
1859 | ||
69893cff | 1860 | # Check for whether we should be running continuously or not. |
36477c24 | 1861 | # _After_ the perl program is compiled, $single is set to 1: |
e22ea7cc RF |
1862 | if ( $single and not $second_time++ ) { |
1863 | ||
69893cff | 1864 | # Options say run non-stop. Run until we get an interrupt. |
e22ea7cc RF |
1865 | if ($runnonstop) { # Disable until signal |
1866 | # If there's any call stack in place, turn off single | |
1867 | # stepping into subs throughout the stack. | |
1868 | for ( $i = 0 ; $i <= $stack_depth ; ) { | |
1869 | $stack[ $i++ ] &= ~1; | |
1870 | } | |
1871 | ||
69893cff | 1872 | # And we are now no longer in single-step mode. |
e22ea7cc | 1873 | $single = 0; |
69893cff RGS |
1874 | |
1875 | # If we simply returned at this point, we wouldn't get | |
1876 | # the trace info. Fall on through. | |
e22ea7cc | 1877 | # return; |
69893cff RGS |
1878 | } ## end if ($runnonstop) |
1879 | ||
e22ea7cc RF |
1880 | elsif ($ImmediateStop) { |
1881 | ||
1882 | # We are supposed to stop here; XXX probably a break. | |
1883 | $ImmediateStop = 0; # We've processed it; turn it off | |
1884 | $signal = 1; # Simulate an interrupt to force | |
1885 | # us into the command loop | |
69893cff RGS |
1886 | } |
1887 | } ## end if ($single and not $second_time... | |
1888 | ||
1889 | # If we're in single-step mode, or an interrupt (real or fake) | |
1890 | # has occurred, turn off non-stop mode. | |
1891 | $runnonstop = 0 if $single or $signal; | |
1892 | ||
1893 | # Preserve current values of $@, $!, $^E, $,, $/, $\, $^W. | |
1894 | # The code being debugged may have altered them. | |
d338d6fe | 1895 | &save; |
69893cff RGS |
1896 | |
1897 | # Since DB::DB gets called after every line, we can use caller() to | |
1898 | # figure out where we last were executing. Sneaky, eh? This works because | |
e22ea7cc | 1899 | # caller is returning all the extra information when called from the |
69893cff | 1900 | # debugger. |
e22ea7cc | 1901 | local ( $package, $filename, $line ) = caller; |
471505cc | 1902 | local $filename_ini = $filename; |
69893cff RGS |
1903 | |
1904 | # set up the context for DB::eval, so it can properly execute | |
1905 | # code on behalf of the user. We add the package in so that the | |
1906 | # code is eval'ed in the proper package (not in the debugger!). | |
1907 | local $usercontext = | |
e22ea7cc | 1908 | '($@, $!, $^E, $,, $/, $\, $^W) = @saved;' . "package $package;"; |
69893cff RGS |
1909 | |
1910 | # Create an alias to the active file magical array to simplify | |
1911 | # the code here. | |
e22ea7cc | 1912 | local (*dbline) = $main::{ '_<' . $filename }; |
aa057b67 CN |
1913 | |
1914 | # we need to check for pseudofiles on Mac OS (these are files | |
1915 | # not attached to a filename, but instead stored in Dev:Pseudo) | |
e22ea7cc RF |
1916 | if ( $^O eq 'MacOS' && $#dbline < 0 ) { |
1917 | $filename_ini = $filename = 'Dev:Pseudo'; | |
1918 | *dbline = $main::{ '_<' . $filename }; | |
aa057b67 CN |
1919 | } |
1920 | ||
69893cff | 1921 | # Last line in the program. |
471505cc | 1922 | local $max = $#dbline; |
69893cff RGS |
1923 | |
1924 | # if we have something here, see if we should break. | |
e22ea7cc RF |
1925 | if ( $dbline{$line} |
1926 | && ( ( $stop, $action ) = split( /\0/, $dbline{$line} ) ) ) | |
1927 | { | |
1928 | ||
69893cff | 1929 | # Stop if the stop criterion says to just stop. |
e22ea7cc | 1930 | if ( $stop eq '1' ) { |
69893cff RGS |
1931 | $signal |= 1; |
1932 | } | |
e22ea7cc | 1933 | |
69893cff RGS |
1934 | # It's a conditional stop; eval it in the user's context and |
1935 | # see if we should stop. If so, remove the one-time sigil. | |
1936 | elsif ($stop) { | |
e22ea7cc | 1937 | $evalarg = "\$DB::signal |= 1 if do {$stop}"; |
69893cff RGS |
1938 | &eval; |
1939 | $dbline{$line} =~ s/;9($|\0)/$1/; | |
1940 | } | |
1941 | } ## end if ($dbline{$line} && ... | |
1942 | ||
1943 | # Preserve the current stop-or-not, and see if any of the W | |
1944 | # (watch expressions) has changed. | |
36477c24 | 1945 | my $was_signal = $signal; |
69893cff RGS |
1946 | |
1947 | # If we have any watch expressions ... | |
e22ea7cc RF |
1948 | if ( $trace & 2 ) { |
1949 | for ( my $n = 0 ; $n <= $#to_watch ; $n++ ) { | |
1950 | $evalarg = $to_watch[$n]; | |
1951 | local $onetimeDump; # Tell DB::eval() to not output results | |
69893cff RGS |
1952 | |
1953 | # Fix context DB::eval() wants to return an array, but | |
1954 | # we need a scalar here. | |
e22ea7cc RF |
1955 | my ($val) = join( "', '", &eval ); |
1956 | $val = ( ( defined $val ) ? "'$val'" : 'undef' ); | |
69893cff RGS |
1957 | |
1958 | # Did it change? | |
e22ea7cc RF |
1959 | if ( $val ne $old_watch[$n] ) { |
1960 | ||
69893cff | 1961 | # Yep! Show the difference, and fake an interrupt. |
e22ea7cc RF |
1962 | $signal = 1; |
1963 | print $OUT <<EOP; | |
405ff068 | 1964 | Watchpoint $n:\t$to_watch[$n] changed: |
69893cff RGS |
1965 | old value:\t$old_watch[$n] |
1966 | new value:\t$val | |
6027b9a3 | 1967 | EOP |
e22ea7cc | 1968 | $old_watch[$n] = $val; |
69893cff RGS |
1969 | } ## end if ($val ne $old_watch... |
1970 | } ## end for (my $n = 0 ; $n <= ... | |
1971 | } ## end if ($trace & 2) | |
1972 | ||
1973 | =head2 C<watchfunction()> | |
1974 | ||
1975 | C<watchfunction()> is a function that can be defined by the user; it is a | |
1976 | function which will be run on each entry to C<DB::DB>; it gets the | |
1977 | current package, filename, and line as its parameters. | |
1978 | ||
1979 | The watchfunction can do anything it likes; it is executing in the | |
1980 | debugger's context, so it has access to all of the debugger's internal | |
1981 | data structures and functions. | |
1982 | ||
1983 | C<watchfunction()> can control the debugger's actions. Any of the following | |
1984 | will cause the debugger to return control to the user's program after | |
1985 | C<watchfunction()> executes: | |
1986 | ||
1987 | =over 4 | |
1988 | ||
be9a9b1d AT |
1989 | =item * |
1990 | ||
1991 | Returning a false value from the C<watchfunction()> itself. | |
1992 | ||
1993 | =item * | |
1994 | ||
1995 | Altering C<$single> to a false value. | |
1996 | ||
1997 | =item * | |
69893cff | 1998 | |
be9a9b1d | 1999 | Altering C<$signal> to a false value. |
69893cff | 2000 | |
be9a9b1d | 2001 | =item * |
69893cff | 2002 | |
be9a9b1d | 2003 | Turning off the C<4> bit in C<$trace> (this also disables the |
69893cff RGS |
2004 | check for C<watchfunction()>. This can be done with |
2005 | ||
2006 | $trace &= ~4; | |
2007 | ||
2008 | =back | |
2009 | ||
2010 | =cut | |
2011 | ||
e22ea7cc | 2012 | # If there's a user-defined DB::watchfunction, call it with the |
69893cff RGS |
2013 | # current package, filename, and line. The function executes in |
2014 | # the DB:: package. | |
e22ea7cc RF |
2015 | if ( $trace & 4 ) { # User-installed watch |
2016 | return | |
2017 | if watchfunction( $package, $filename, $line ) | |
2018 | and not $single | |
2019 | and not $was_signal | |
2020 | and not( $trace & ~4 ); | |
69893cff RGS |
2021 | } ## end if ($trace & 4) |
2022 | ||
e22ea7cc | 2023 | # Pick up any alteration to $signal in the watchfunction, and |
69893cff | 2024 | # turn off the signal now. |
6027b9a3 | 2025 | $was_signal = $signal; |
69893cff RGS |
2026 | $signal = 0; |
2027 | ||
2028 | =head2 GETTING READY TO EXECUTE COMMANDS | |
2029 | ||
2030 | The debugger decides to take control if single-step mode is on, the | |
2031 | C<t> command was entered, or the user generated a signal. If the program | |
2032 | has fallen off the end, we set things up so that entering further commands | |
2033 | won't cause trouble, and we say that the program is over. | |
2034 | ||
2035 | =cut | |
2036 | ||
2037 | # Check to see if we should grab control ($single true, | |
2038 | # trace set appropriately, or we got a signal). | |
e22ea7cc RF |
2039 | if ( $single || ( $trace & 1 ) || $was_signal ) { |
2040 | ||
69893cff | 2041 | # Yes, grab control. |
e22ea7cc RF |
2042 | if ($slave_editor) { |
2043 | ||
69893cff | 2044 | # Tell the editor to update its position. |
e22ea7cc RF |
2045 | $position = "\032\032$filename:$line:0\n"; |
2046 | print_lineinfo($position); | |
2047 | } | |
69893cff RGS |
2048 | |
2049 | =pod | |
2050 | ||
2051 | Special check: if we're in package C<DB::fake>, we've gone through the | |
2052 | C<END> block at least once. We set up everything so that we can continue | |
2053 | to enter commands and have a valid context to be in. | |
2054 | ||
2055 | =cut | |
2056 | ||
e22ea7cc | 2057 | elsif ( $package eq 'DB::fake' ) { |
69893cff | 2058 | |
69893cff | 2059 | # Fallen off the end already. |
e22ea7cc RF |
2060 | $term || &setterm; |
2061 | print_help(<<EOP); | |
405ff068 | 2062 | Debugged program terminated. Use B<q> to quit or B<R> to restart, |
6b27b0a0 BD |
2063 | use B<o> I<inhibit_exit> to avoid stopping after program termination, |
2064 | B<h q>, B<h R> or B<h o> to get additional info. | |
405ff068 | 2065 | EOP |
e22ea7cc | 2066 | |
69893cff | 2067 | # Set the DB::eval context appropriately. |
e22ea7cc RF |
2068 | $package = 'main'; |
2069 | $usercontext = | |
2070 | '($@, $!, $^E, $,, $/, $\, $^W) = @saved;' | |
2071 | . "package $package;"; # this won't let them modify, alas | |
69893cff | 2072 | } ## end elsif ($package eq 'DB::fake') |
e219e2fb | 2073 | |
69893cff | 2074 | =pod |
e219e2fb | 2075 | |
69893cff RGS |
2076 | If the program hasn't finished executing, we scan forward to the |
2077 | next executable line, print that out, build the prompt from the file and line | |
2078 | number information, and print that. | |
e219e2fb | 2079 | |
69893cff RGS |
2080 | =cut |
2081 | ||
e22ea7cc RF |
2082 | else { |
2083 | ||
69893cff RGS |
2084 | # Still somewhere in the midst of execution. Set up the |
2085 | # debugger prompt. | |
2086 | $sub =~ s/\'/::/; # Swap Perl 4 package separators (') to | |
e22ea7cc | 2087 | # Perl 5 ones (sorry, we don't print Klingon |
69893cff RGS |
2088 | #module names) |
2089 | ||
e22ea7cc RF |
2090 | $prefix = $sub =~ /::/ ? "" : "${'package'}::"; |
2091 | $prefix .= "$sub($filename:"; | |
2092 | $after = ( $dbline[$line] =~ /\n$/ ? '' : "\n" ); | |
69893cff RGS |
2093 | |
2094 | # Break up the prompt if it's really long. | |
e22ea7cc RF |
2095 | if ( length($prefix) > 30 ) { |
2096 | $position = "$prefix$line):\n$line:\t$dbline[$line]$after"; | |
2097 | $prefix = ""; | |
2098 | $infix = ":\t"; | |
2099 | } | |
2100 | else { | |
2101 | $infix = "):\t"; | |
2102 | $position = "$prefix$line$infix$dbline[$line]$after"; | |
2103 | } | |
69893cff RGS |
2104 | |
2105 | # Print current line info, indenting if necessary. | |
e22ea7cc RF |
2106 | if ($frame) { |
2107 | print_lineinfo( ' ' x $stack_depth, | |
2108 | "$line:\t$dbline[$line]$after" ); | |
2109 | } | |
2110 | else { | |
2111 | print_lineinfo($position); | |
2112 | } | |
69893cff RGS |
2113 | |
2114 | # Scan forward, stopping at either the end or the next | |
2115 | # unbreakable line. | |
e22ea7cc RF |
2116 | for ( $i = $line + 1 ; $i <= $max && $dbline[$i] == 0 ; ++$i ) |
2117 | { #{ vi | |
69893cff RGS |
2118 | |
2119 | # Drop out on null statements, block closers, and comments. | |
2120 | last if $dbline[$i] =~ /^\s*[\;\}\#\n]/; | |
2121 | ||
2122 | # Drop out if the user interrupted us. | |
2123 | last if $signal; | |
2124 | ||
2125 | # Append a newline if the line doesn't have one. Can happen | |
2126 | # in eval'ed text, for instance. | |
e22ea7cc | 2127 | $after = ( $dbline[$i] =~ /\n$/ ? '' : "\n" ); |
69893cff RGS |
2128 | |
2129 | # Next executable line. | |
2130 | $incr_pos = "$prefix$i$infix$dbline[$i]$after"; | |
2131 | $position .= $incr_pos; | |
2132 | if ($frame) { | |
e22ea7cc | 2133 | |
69893cff | 2134 | # Print it indented if tracing is on. |
e22ea7cc RF |
2135 | print_lineinfo( ' ' x $stack_depth, |
2136 | "$i:\t$dbline[$i]$after" ); | |
69893cff RGS |
2137 | } |
2138 | else { | |
2139 | print_lineinfo($incr_pos); | |
2140 | } | |
2141 | } ## end for ($i = $line + 1 ; $i... | |
2142 | } ## end else [ if ($slave_editor) | |
2143 | } ## end if ($single || ($trace... | |
2144 | ||
2145 | =pod | |
2146 | ||
2147 | If there's an action to be executed for the line we stopped at, execute it. | |
2148 | If there are any preprompt actions, execute those as well. | |
e219e2fb RF |
2149 | |
2150 | =cut | |
2151 | ||
69893cff RGS |
2152 | # If there's an action, do it now. |
2153 | $evalarg = $action, &eval if $action; | |
e219e2fb | 2154 | |
69893cff RGS |
2155 | # Are we nested another level (e.g., did we evaluate a function |
2156 | # that had a breakpoint in it at the debugger prompt)? | |
e22ea7cc RF |
2157 | if ( $single || $was_signal ) { |
2158 | ||
69893cff | 2159 | # Yes, go down a level. |
e22ea7cc | 2160 | local $level = $level + 1; |
69893cff RGS |
2161 | |
2162 | # Do any pre-prompt actions. | |
e22ea7cc RF |
2163 | foreach $evalarg (@$pre) { |
2164 | &eval; | |
2165 | } | |
69893cff RGS |
2166 | |
2167 | # Complain about too much recursion if we passed the limit. | |
e22ea7cc | 2168 | print $OUT $stack_depth . " levels deep in subroutine calls!\n" |
69893cff RGS |
2169 | if $single & 4; |
2170 | ||
2171 | # The line we're currently on. Set $incr to -1 to stay here | |
2172 | # until we get a command that tells us to advance. | |
e22ea7cc RF |
2173 | $start = $line; |
2174 | $incr = -1; # for backward motion. | |
69893cff RGS |
2175 | |
2176 | # Tack preprompt debugger actions ahead of any actual input. | |
e22ea7cc | 2177 | @typeahead = ( @$pretype, @typeahead ); |
69893cff RGS |
2178 | |
2179 | =head2 WHERE ARE WE? | |
2180 | ||
2181 | XXX Relocate this section? | |
2182 | ||
2183 | The debugger normally shows the line corresponding to the current line of | |
2184 | execution. Sometimes, though, we want to see the next line, or to move elsewhere | |
2185 | in the file. This is done via the C<$incr>, C<$start>, and C<$max> variables. | |
2186 | ||
be9a9b1d AT |
2187 | C<$incr> controls by how many lines the I<current> line should move forward |
2188 | after a command is executed. If set to -1, this indicates that the I<current> | |
69893cff RGS |
2189 | line shouldn't change. |
2190 | ||
be9a9b1d | 2191 | C<$start> is the I<current> line. It is used for things like knowing where to |
69893cff RGS |
2192 | move forwards or backwards from when doing an C<L> or C<-> command. |
2193 | ||
2194 | C<$max> tells the debugger where the last line of the current file is. It's | |
2195 | used to terminate loops most often. | |
2196 | ||
2197 | =head2 THE COMMAND LOOP | |
2198 | ||
2199 | Most of C<DB::DB> is actually a command parsing and dispatch loop. It comes | |
2200 | in two parts: | |
2201 | ||
2202 | =over 4 | |
2203 | ||
be9a9b1d AT |
2204 | =item * |
2205 | ||
2206 | The outer part of the loop, starting at the C<CMD> label. This loop | |
69893cff RGS |
2207 | reads a command and then executes it. |
2208 | ||
be9a9b1d AT |
2209 | =item * |
2210 | ||
2211 | The inner part of the loop, starting at the C<PIPE> label. This part | |
69893cff RGS |
2212 | is wholly contained inside the C<CMD> block and only executes a command. |
2213 | Used to handle commands running inside a pager. | |
2214 | ||
2215 | =back | |
2216 | ||
2217 | So why have two labels to restart the loop? Because sometimes, it's easier to | |
2218 | have a command I<generate> another command and then re-execute the loop to do | |
2219 | the new command. This is faster, but perhaps a bit more convoluted. | |
2220 | ||
2221 | =cut | |
2222 | ||
2223 | # The big command dispatch loop. It keeps running until the | |
2224 | # user yields up control again. | |
2225 | # | |
2226 | # If we have a terminal for input, and we get something back | |
2227 | # from readline(), keep on processing. | |
e22ea7cc RF |
2228 | CMD: |
2229 | while ( | |
2230 | ||
69893cff | 2231 | # We have a terminal, or can get one ... |
e22ea7cc RF |
2232 | ( $term || &setterm ), |
2233 | ||
69893cff | 2234 | # ... and it belogs to this PID or we get one for this PID ... |
e22ea7cc RF |
2235 | ( $term_pid == $$ or resetterm(1) ), |
2236 | ||
69893cff | 2237 | # ... and we got a line of command input ... |
e22ea7cc RF |
2238 | defined( |
2239 | $cmd = &readline( | |
2cbb2ee1 | 2240 | "$pidprompt $tid DB" |
e22ea7cc RF |
2241 | . ( '<' x $level ) |
2242 | . ( $#hist + 1 ) | |
2243 | . ( '>' x $level ) . " " | |
69893cff RGS |
2244 | ) |
2245 | ) | |
2246 | ) | |
2247 | { | |
e22ea7cc | 2248 | |
2cbb2ee1 | 2249 | share($cmd); |
69893cff RGS |
2250 | # ... try to execute the input as debugger commands. |
2251 | ||
2252 | # Don't stop running. | |
2253 | $single = 0; | |
2254 | ||
2255 | # No signal is active. | |
2256 | $signal = 0; | |
2257 | ||
2258 | # Handle continued commands (ending with \): | |
e22ea7cc RF |
2259 | $cmd =~ s/\\$/\n/ && do { |
2260 | $cmd .= &readline(" cont: "); | |
2261 | redo CMD; | |
2262 | }; | |
69893cff RGS |
2263 | |
2264 | =head4 The null command | |
2265 | ||
be9a9b1d | 2266 | A newline entered by itself means I<re-execute the last command>. We grab the |
69893cff RGS |
2267 | command out of C<$laststep> (where it was recorded previously), and copy it |
2268 | back into C<$cmd> to be executed below. If there wasn't any previous command, | |
2269 | we'll do nothing below (no command will match). If there was, we also save it | |
2270 | in the command history and fall through to allow the command parsing to pick | |
2271 | it up. | |
2272 | ||
2273 | =cut | |
2274 | ||
2275 | # Empty input means repeat the last command. | |
e22ea7cc RF |
2276 | $cmd =~ /^$/ && ( $cmd = $laststep ); |
2277 | chomp($cmd); # get rid of the annoying extra newline | |
2278 | push( @hist, $cmd ) if length($cmd) > 1; | |
2279 | push( @truehist, $cmd ); | |
2cbb2ee1 RGS |
2280 | share(@hist); |
2281 | share(@truehist); | |
e22ea7cc RF |
2282 | |
2283 | # This is a restart point for commands that didn't arrive | |
2284 | # via direct user input. It allows us to 'redo PIPE' to | |
2285 | # re-execute command processing without reading a new command. | |
69893cff | 2286 | PIPE: { |
e22ea7cc RF |
2287 | $cmd =~ s/^\s+//s; # trim annoying leading whitespace |
2288 | $cmd =~ s/\s+$//s; # trim annoying trailing whitespace | |
2289 | ($i) = split( /\s+/, $cmd ); | |
69893cff RGS |
2290 | |
2291 | =head3 COMMAND ALIASES | |
2292 | ||
2293 | The debugger can create aliases for commands (these are stored in the | |
2294 | C<%alias> hash). Before a command is executed, the command loop looks it up | |
2295 | in the alias hash and substitutes the contents of the alias for the command, | |
2296 | completely replacing it. | |
2297 | ||
2298 | =cut | |
2299 | ||
2300 | # See if there's an alias for the command, and set it up if so. | |
e22ea7cc RF |
2301 | if ( $alias{$i} ) { |
2302 | ||
69893cff RGS |
2303 | # Squelch signal handling; we want to keep control here |
2304 | # if something goes loco during the alias eval. | |
2305 | local $SIG{__DIE__}; | |
2306 | local $SIG{__WARN__}; | |
2307 | ||
2308 | # This is a command, so we eval it in the DEBUGGER's | |
2309 | # scope! Otherwise, we can't see the special debugger | |
2310 | # variables, or get to the debugger's subs. (Well, we | |
2311 | # _could_, but why make it even more complicated?) | |
2312 | eval "\$cmd =~ $alias{$i}"; | |
2313 | if ($@) { | |
2314 | local $\ = ''; | |
2315 | print $OUT "Couldn't evaluate `$i' alias: $@"; | |
2316 | next CMD; | |
2317 | } | |
2318 | } ## end if ($alias{$i}) | |
2319 | ||
2320 | =head3 MAIN-LINE COMMANDS | |
2321 | ||
2322 | All of these commands work up to and after the program being debugged has | |
2323 | terminated. | |
2324 | ||
2325 | =head4 C<q> - quit | |
2326 | ||
2327 | Quit the debugger. This entails setting the C<$fall_off_end> flag, so we don't | |
2328 | try to execute further, cleaning any restart-related stuff out of the | |
2329 | environment, and executing with the last value of C<$?>. | |
2330 | ||
2331 | =cut | |
2332 | ||
2333 | $cmd =~ /^q$/ && do { | |
2334 | $fall_off_end = 1; | |
2335 | clean_ENV(); | |
2336 | exit $?; | |
2337 | }; | |
2338 | ||
2339 | =head4 C<t> - trace | |
2340 | ||
2341 | Turn tracing on or off. Inverts the appropriate bit in C<$trace> (q.v.). | |
2342 | ||
2343 | =cut | |
2344 | ||
e22ea7cc RF |
2345 | $cmd =~ /^t$/ && do { |
2346 | $trace ^= 1; | |
2347 | local $\ = ''; | |
2348 | print $OUT "Trace = " | |
2349 | . ( ( $trace & 1 ) ? "on" : "off" ) . "\n"; | |
2350 | next CMD; | |
2351 | }; | |
69893cff RGS |
2352 | |
2353 | =head4 C<S> - list subroutines matching/not matching a pattern | |
2354 | ||
2355 | Walks through C<%sub>, checking to see whether or not to print the name. | |
2356 | ||
2357 | =cut | |
2358 | ||
e22ea7cc | 2359 | $cmd =~ /^S(\s+(!)?(.+))?$/ && do { |
69893cff | 2360 | |
e22ea7cc | 2361 | $Srev = defined $2; # Reverse scan? |
69893cff RGS |
2362 | $Spatt = $3; # The pattern (if any) to use. |
2363 | $Snocheck = !defined $1; # No args - print all subs. | |
2364 | ||
2365 | # Need to make these sane here. | |
e22ea7cc RF |
2366 | local $\ = ''; |
2367 | local $, = ''; | |
69893cff RGS |
2368 | |
2369 | # Search through the debugger's magical hash of subs. | |
2370 | # If $nocheck is true, just print the sub name. | |
2371 | # Otherwise, check it against the pattern. We then use | |
2372 | # the XOR trick to reverse the condition as required. | |
e22ea7cc RF |
2373 | foreach $subname ( sort( keys %sub ) ) { |
2374 | if ( $Snocheck or $Srev ^ ( $subname =~ /$Spatt/ ) ) { | |
2375 | print $OUT $subname, "\n"; | |
2376 | } | |
2377 | } | |
2378 | next CMD; | |
2379 | }; | |
69893cff RGS |
2380 | |
2381 | =head4 C<X> - list variables in current package | |
2382 | ||
2383 | Since the C<V> command actually processes this, just change this to the | |
2384 | appropriate C<V> command and fall through. | |
2385 | ||
2386 | =cut | |
2387 | ||
e22ea7cc | 2388 | $cmd =~ s/^X\b/V $package/; |
69893cff RGS |
2389 | |
2390 | =head4 C<V> - list variables | |
2391 | ||
2392 | Uses C<dumpvar.pl> to dump out the current values for selected variables. | |
2393 | ||
2394 | =cut | |
2395 | ||
2396 | # Bare V commands get the currently-being-debugged package | |
2397 | # added. | |
e22ea7cc RF |
2398 | $cmd =~ /^V$/ && do { |
2399 | $cmd = "V $package"; | |
2400 | }; | |
69893cff RGS |
2401 | |
2402 | # V - show variables in package. | |
2403 | $cmd =~ /^V\b\s*(\S+)\s*(.*)/ && do { | |
e22ea7cc | 2404 | |
69893cff RGS |
2405 | # Save the currently selected filehandle and |
2406 | # force output to debugger's filehandle (dumpvar | |
2407 | # just does "print" for output). | |
e22ea7cc | 2408 | local ($savout) = select($OUT); |
69893cff RGS |
2409 | |
2410 | # Grab package name and variables to dump. | |
e22ea7cc RF |
2411 | $packname = $1; |
2412 | @vars = split( ' ', $2 ); | |
69893cff RGS |
2413 | |
2414 | # If main::dumpvar isn't here, get it. | |
e81465be | 2415 | do 'dumpvar.pl' || die $@ unless defined &main::dumpvar; |
e22ea7cc RF |
2416 | if ( defined &main::dumpvar ) { |
2417 | ||
69893cff RGS |
2418 | # We got it. Turn off subroutine entry/exit messages |
2419 | # for the moment, along with return values. | |
e22ea7cc RF |
2420 | local $frame = 0; |
2421 | local $doret = -2; | |
69893cff RGS |
2422 | |
2423 | # must detect sigpipe failures - not catching | |
2424 | # then will cause the debugger to die. | |
2425 | eval { | |
2426 | &main::dumpvar( | |
2427 | $packname, | |
2428 | defined $option{dumpDepth} | |
e22ea7cc RF |
2429 | ? $option{dumpDepth} |
2430 | : -1, # assume -1 unless specified | |
69893cff | 2431 | @vars |
e22ea7cc RF |
2432 | ); |
2433 | }; | |
2434 | ||
2435 | # The die doesn't need to include the $@, because | |
2436 | # it will automatically get propagated for us. | |
2437 | if ($@) { | |
2438 | die unless $@ =~ /dumpvar print failed/; | |
2439 | } | |
2440 | } ## end if (defined &main::dumpvar) | |
2441 | else { | |
2442 | ||
2443 | # Couldn't load dumpvar. | |
2444 | print $OUT "dumpvar.pl not available.\n"; | |
2445 | } | |
69893cff | 2446 | |
69893cff | 2447 | # Restore the output filehandle, and go round again. |
e22ea7cc RF |
2448 | select($savout); |
2449 | next CMD; | |
2450 | }; | |
69893cff RGS |
2451 | |
2452 | =head4 C<x> - evaluate and print an expression | |
2453 | ||
2454 | Hands the expression off to C<DB::eval>, setting it up to print the value | |
2455 | via C<dumpvar.pl> instead of just printing it directly. | |
2456 | ||
2457 | =cut | |
2458 | ||
e22ea7cc RF |
2459 | $cmd =~ s/^x\b/ / && do { # Remainder gets done by DB::eval() |
2460 | $onetimeDump = 'dump'; # main::dumpvar shows the output | |
69893cff RGS |
2461 | |
2462 | # handle special "x 3 blah" syntax XXX propagate | |
2463 | # doc back to special variables. | |
e22ea7cc RF |
2464 | if ( $cmd =~ s/^\s*(\d+)(?=\s)/ / ) { |
2465 | $onetimedumpDepth = $1; | |
2466 | } | |
2467 | }; | |
69893cff RGS |
2468 | |
2469 | =head4 C<m> - print methods | |
2470 | ||
2471 | Just uses C<DB::methods> to determine what methods are available. | |
2472 | ||
2473 | =cut | |
2474 | ||
e22ea7cc RF |
2475 | $cmd =~ s/^m\s+([\w:]+)\s*$/ / && do { |
2476 | methods($1); | |
2477 | next CMD; | |
2478 | }; | |
69893cff RGS |
2479 | |
2480 | # m expr - set up DB::eval to do the work | |
e22ea7cc RF |
2481 | $cmd =~ s/^m\b/ / && do { # Rest gets done by DB::eval() |
2482 | $onetimeDump = 'methods'; # method output gets used there | |
2483 | }; | |
69893cff RGS |
2484 | |
2485 | =head4 C<f> - switch files | |
2486 | ||
2487 | =cut | |
2488 | ||
e22ea7cc RF |
2489 | $cmd =~ /^f\b\s*(.*)/ && do { |
2490 | $file = $1; | |
2491 | $file =~ s/\s+$//; | |
69893cff RGS |
2492 | |
2493 | # help for no arguments (old-style was return from sub). | |
e22ea7cc RF |
2494 | if ( !$file ) { |
2495 | print $OUT | |
2496 | "The old f command is now the r command.\n"; # hint | |
2497 | print $OUT "The new f command switches filenames.\n"; | |
2498 | next CMD; | |
2499 | } ## end if (!$file) | |
69893cff RGS |
2500 | |
2501 | # if not in magic file list, try a close match. | |
e22ea7cc RF |
2502 | if ( !defined $main::{ '_<' . $file } ) { |
2503 | if ( ($try) = grep( m#^_<.*$file#, keys %main:: ) ) { | |
2504 | { | |
2505 | $try = substr( $try, 2 ); | |
2506 | print $OUT "Choosing $try matching `$file':\n"; | |
2507 | $file = $try; | |
2508 | } | |
2509 | } ## end if (($try) = grep(m#^_<.*$file#... | |
2510 | } ## end if (!defined $main::{ ... | |
69893cff RGS |
2511 | |
2512 | # If not successfully switched now, we failed. | |
e22ea7cc RF |
2513 | if ( !defined $main::{ '_<' . $file } ) { |
2514 | print $OUT "No file matching `$file' is loaded.\n"; | |
2515 | next CMD; | |
2516 | } | |
69893cff | 2517 | |
e22ea7cc RF |
2518 | # We switched, so switch the debugger internals around. |
2519 | elsif ( $file ne $filename ) { | |
2520 | *dbline = $main::{ '_<' . $file }; | |
2521 | $max = $#dbline; | |
2522 | $filename = $file; | |
2523 | $start = 1; | |
2524 | $cmd = "l"; | |
2525 | } ## end elsif ($file ne $filename) | |
2526 | ||
2527 | # We didn't switch; say we didn't. | |
2528 | else { | |
2529 | print $OUT "Already in $file.\n"; | |
2530 | next CMD; | |
2531 | } | |
2532 | }; | |
69893cff RGS |
2533 | |
2534 | =head4 C<.> - return to last-executed line. | |
2535 | ||
2536 | We set C<$incr> to -1 to indicate that the debugger shouldn't move ahead, | |
2537 | and then we look up the line in the magical C<%dbline> hash. | |
2538 | ||
2539 | =cut | |
2540 | ||
2541 | # . command. | |
e22ea7cc RF |
2542 | $cmd =~ /^\.$/ && do { |
2543 | $incr = -1; # stay at current line | |
69893cff RGS |
2544 | |
2545 | # Reset everything to the old location. | |
e22ea7cc RF |
2546 | $start = $line; |
2547 | $filename = $filename_ini; | |
2548 | *dbline = $main::{ '_<' . $filename }; | |
2549 | $max = $#dbline; | |
69893cff RGS |
2550 | |
2551 | # Now where are we? | |
e22ea7cc RF |
2552 | print_lineinfo($position); |
2553 | next CMD; | |
2554 | }; | |
69893cff RGS |
2555 | |
2556 | =head4 C<-> - back one window | |
2557 | ||
2558 | We change C<$start> to be one window back; if we go back past the first line, | |
2559 | we set it to be the first line. We ser C<$incr> to put us back at the | |
2560 | currently-executing line, and then put a C<l $start +> (list one window from | |
2561 | C<$start>) in C<$cmd> to be executed later. | |
2562 | ||
2563 | =cut | |
2564 | ||
2565 | # - - back a window. | |
e22ea7cc RF |
2566 | $cmd =~ /^-$/ && do { |
2567 | ||
69893cff | 2568 | # back up by a window; go to 1 if back too far. |
e22ea7cc RF |
2569 | $start -= $incr + $window + 1; |
2570 | $start = 1 if $start <= 0; | |
2571 | $incr = $window - 1; | |
69893cff RGS |
2572 | |
2573 | # Generate and execute a "l +" command (handled below). | |
e22ea7cc RF |
2574 | $cmd = 'l ' . ($start) . '+'; |
2575 | }; | |
69893cff RGS |
2576 | |
2577 | =head3 PRE-580 COMMANDS VS. NEW COMMANDS: C<a, A, b, B, h, l, L, M, o, O, P, v, w, W, E<lt>, E<lt>E<lt>, {, {{> | |
2578 | ||
2579 | In Perl 5.8.0, a realignment of the commands was done to fix up a number of | |
2580 | problems, most notably that the default case of several commands destroying | |
2581 | the user's work in setting watchpoints, actions, etc. We wanted, however, to | |
2582 | retain the old commands for those who were used to using them or who preferred | |
2583 | them. At this point, we check for the new commands and call C<cmd_wrapper> to | |
2584 | deal with them instead of processing them in-line. | |
2585 | ||
2586 | =cut | |
2587 | ||
2588 | # All of these commands were remapped in perl 5.8.0; | |
e22ea7cc | 2589 | # we send them off to the secondary dispatcher (see below). |
2cbb2ee1 | 2590 | $cmd =~ /^([aAbBeEhilLMoOPvwW]\b|[<>\{]{1,2})\s*(.*)/so && do { |
e22ea7cc RF |
2591 | &cmd_wrapper( $1, $2, $line ); |
2592 | next CMD; | |
2593 | }; | |
69893cff RGS |
2594 | |
2595 | =head4 C<y> - List lexicals in higher scope | |
2596 | ||
2597 | Uses C<PadWalker> to find the lexicals supplied as arguments in a scope | |
2598 | above the current one and then displays then using C<dumpvar.pl>. | |
2599 | ||
2600 | =cut | |
2601 | ||
2602 | $cmd =~ /^y(?:\s+(\d*)\s*(.*))?$/ && do { | |
2603 | ||
2604 | # See if we've got the necessary support. | |
2605 | eval { require PadWalker; PadWalker->VERSION(0.08) } | |
2606 | or &warn( | |
2607 | $@ =~ /locate/ | |
2608 | ? "PadWalker module not found - please install\n" | |
2609 | : $@ | |
2610 | ) | |
2611 | and next CMD; | |
2612 | ||
2613 | # Load up dumpvar if we don't have it. If we can, that is. | |
e81465be | 2614 | do 'dumpvar.pl' || die $@ unless defined &main::dumpvar; |
69893cff RGS |
2615 | defined &main::dumpvar |
2616 | or print $OUT "dumpvar.pl not available.\n" | |
2617 | and next CMD; | |
2618 | ||
2619 | # Got all the modules we need. Find them and print them. | |
e22ea7cc | 2620 | my @vars = split( ' ', $2 || '' ); |
69893cff RGS |
2621 | |
2622 | # Find the pad. | |
e22ea7cc | 2623 | my $h = eval { PadWalker::peek_my( ( $1 || 0 ) + 1 ) }; |
69893cff RGS |
2624 | |
2625 | # Oops. Can't find it. | |
2626 | $@ and $@ =~ s/ at .*//, &warn($@), next CMD; | |
2627 | ||
2628 | # Show the desired vars with dumplex(). | |
2629 | my $savout = select($OUT); | |
2630 | ||
2631 | # Have dumplex dump the lexicals. | |
e22ea7cc | 2632 | dumpvar::dumplex( $_, $h->{$_}, |
69893cff | 2633 | defined $option{dumpDepth} ? $option{dumpDepth} : -1, |
e22ea7cc RF |
2634 | @vars ) |
2635 | for sort keys %$h; | |
69893cff RGS |
2636 | select($savout); |
2637 | next CMD; | |
2638 | }; | |
2639 | ||
2640 | =head3 COMMANDS NOT WORKING AFTER PROGRAM ENDS | |
2641 | ||
2642 | All of the commands below this point don't work after the program being | |
2643 | debugged has ended. All of them check to see if the program has ended; this | |
2644 | allows the commands to be relocated without worrying about a 'line of | |
2645 | demarcation' above which commands can be entered anytime, and below which | |
2646 | they can't. | |
2647 | ||
2648 | =head4 C<n> - single step, but don't trace down into subs | |
2649 | ||
2650 | Done by setting C<$single> to 2, which forces subs to execute straight through | |
be9a9b1d | 2651 | when entered (see C<DB::sub>). We also save the C<n> command in C<$laststep>, |
69893cff RGS |
2652 | so a null command knows what to re-execute. |
2653 | ||
2654 | =cut | |
2655 | ||
e22ea7cc | 2656 | # n - next |
69893cff RGS |
2657 | $cmd =~ /^n$/ && do { |
2658 | end_report(), next CMD if $finished and $level <= 1; | |
e22ea7cc | 2659 | |
69893cff RGS |
2660 | # Single step, but don't enter subs. |
2661 | $single = 2; | |
e22ea7cc | 2662 | |
69893cff | 2663 | # Save for empty command (repeat last). |
e22ea7cc RF |
2664 | $laststep = $cmd; |
2665 | last CMD; | |
2666 | }; | |
69893cff RGS |
2667 | |
2668 | =head4 C<s> - single-step, entering subs | |
2669 | ||
be9a9b1d | 2670 | Sets C<$single> to 1, which causes C<DB::sub> to continue tracing inside |
69893cff RGS |
2671 | subs. Also saves C<s> as C<$lastcmd>. |
2672 | ||
2673 | =cut | |
2674 | ||
2675 | # s - single step. | |
2676 | $cmd =~ /^s$/ && do { | |
e22ea7cc | 2677 | |
69893cff RGS |
2678 | # Get out and restart the command loop if program |
2679 | # has finished. | |
e22ea7cc RF |
2680 | end_report(), next CMD if $finished and $level <= 1; |
2681 | ||
69893cff | 2682 | # Single step should enter subs. |
e22ea7cc RF |
2683 | $single = 1; |
2684 | ||
69893cff | 2685 | # Save for empty command (repeat last). |
e22ea7cc RF |
2686 | $laststep = $cmd; |
2687 | last CMD; | |
2688 | }; | |
69893cff RGS |
2689 | |
2690 | =head4 C<c> - run continuously, setting an optional breakpoint | |
2691 | ||
2692 | Most of the code for this command is taken up with locating the optional | |
2693 | breakpoint, which is either a subroutine name or a line number. We set | |
2694 | the appropriate one-time-break in C<@dbline> and then turn off single-stepping | |
2695 | in this and all call levels above this one. | |
2696 | ||
2697 | =cut | |
2698 | ||
2699 | # c - start continuous execution. | |
2700 | $cmd =~ /^c\b\s*([\w:]*)\s*$/ && do { | |
e22ea7cc | 2701 | |
69893cff RGS |
2702 | # Hey, show's over. The debugged program finished |
2703 | # executing already. | |
2704 | end_report(), next CMD if $finished and $level <= 1; | |
2705 | ||
2706 | # Capture the place to put a one-time break. | |
2707 | $subname = $i = $1; | |
2708 | ||
e22ea7cc RF |
2709 | # Probably not needed, since we finish an interactive |
2710 | # sub-session anyway... | |
2711 | # local $filename = $filename; | |
2712 | # local *dbline = *dbline; # XXX Would this work?! | |
69893cff RGS |
2713 | # |
2714 | # The above question wonders if localizing the alias | |
2715 | # to the magic array works or not. Since it's commented | |
2716 | # out, we'll just leave that to speculation for now. | |
2717 | ||
2718 | # If the "subname" isn't all digits, we'll assume it | |
2719 | # is a subroutine name, and try to find it. | |
e22ea7cc RF |
2720 | if ( $subname =~ /\D/ ) { # subroutine name |
2721 | # Qualify it to the current package unless it's | |
2722 | # already qualified. | |
69893cff RGS |
2723 | $subname = $package . "::" . $subname |
2724 | unless $subname =~ /::/; | |
e22ea7cc | 2725 | |
69893cff RGS |
2726 | # find_sub will return "file:line_number" corresponding |
2727 | # to where the subroutine is defined; we call find_sub, | |
e22ea7cc | 2728 | # break up the return value, and assign it in one |
69893cff | 2729 | # operation. |
e22ea7cc | 2730 | ( $file, $i ) = ( find_sub($subname) =~ /^(.*):(.*)$/ ); |
69893cff RGS |
2731 | |
2732 | # Force the line number to be numeric. | |
e22ea7cc | 2733 | $i += 0; |
69893cff RGS |
2734 | |
2735 | # If we got a line number, we found the sub. | |
e22ea7cc RF |
2736 | if ($i) { |
2737 | ||
69893cff RGS |
2738 | # Switch all the debugger's internals around so |
2739 | # we're actually working with that file. | |
e22ea7cc RF |
2740 | $filename = $file; |
2741 | *dbline = $main::{ '_<' . $filename }; | |
2742 | ||
69893cff | 2743 | # Mark that there's a breakpoint in this file. |
e22ea7cc RF |
2744 | $had_breakpoints{$filename} |= 1; |
2745 | ||
69893cff RGS |
2746 | # Scan forward to the first executable line |
2747 | # after the 'sub whatever' line. | |
e22ea7cc RF |
2748 | $max = $#dbline; |
2749 | ++$i while $dbline[$i] == 0 && $i < $max; | |
2750 | } ## end if ($i) | |
69893cff RGS |
2751 | |
2752 | # We didn't find a sub by that name. | |
e22ea7cc RF |
2753 | else { |
2754 | print $OUT "Subroutine $subname not found.\n"; | |
2755 | next CMD; | |
2756 | } | |
2757 | } ## end if ($subname =~ /\D/) | |
69893cff RGS |
2758 | |
2759 | # At this point, either the subname was all digits (an | |
2760 | # absolute line-break request) or we've scanned through | |
2761 | # the code following the definition of the sub, looking | |
2762 | # for an executable, which we may or may not have found. | |
2763 | # | |
2764 | # If $i (which we set $subname from) is non-zero, we | |
e22ea7cc RF |
2765 | # got a request to break at some line somewhere. On |
2766 | # one hand, if there wasn't any real subroutine name | |
2767 | # involved, this will be a request to break in the current | |
2768 | # file at the specified line, so we have to check to make | |
69893cff RGS |
2769 | # sure that the line specified really is breakable. |
2770 | # | |
2771 | # On the other hand, if there was a subname supplied, the | |
3c4b39be | 2772 | # preceding block has moved us to the proper file and |
69893cff RGS |
2773 | # location within that file, and then scanned forward |
2774 | # looking for the next executable line. We have to make | |
2775 | # sure that one was found. | |
2776 | # | |
2777 | # On the gripping hand, we can't do anything unless the | |
2778 | # current value of $i points to a valid breakable line. | |
2779 | # Check that. | |
e22ea7cc RF |
2780 | if ($i) { |
2781 | ||
69893cff | 2782 | # Breakable? |
e22ea7cc RF |
2783 | if ( $dbline[$i] == 0 ) { |
2784 | print $OUT "Line $i not breakable.\n"; | |
2785 | next CMD; | |
2786 | } | |
2787 | ||
69893cff | 2788 | # Yes. Set up the one-time-break sigil. |
e22ea7cc RF |
2789 | $dbline{$i} =~ s/($|\0)/;9$1/; # add one-time-only b.p. |
2790 | } ## end if ($i) | |
69893cff RGS |
2791 | |
2792 | # Turn off stack tracing from here up. | |
e22ea7cc RF |
2793 | for ( $i = 0 ; $i <= $stack_depth ; ) { |
2794 | $stack[ $i++ ] &= ~1; | |
2795 | } | |
2796 | last CMD; | |
2797 | }; | |
69893cff RGS |
2798 | |
2799 | =head4 C<r> - return from a subroutine | |
2800 | ||
2801 | For C<r> to work properly, the debugger has to stop execution again | |
2802 | immediately after the return is executed. This is done by forcing | |
2803 | single-stepping to be on in the call level above the current one. If | |
2804 | we are printing return values when a C<r> is executed, set C<$doret> | |
2805 | appropriately, and force us out of the command loop. | |
2806 | ||
2807 | =cut | |
2808 | ||
2809 | # r - return from the current subroutine. | |
e22ea7cc RF |
2810 | $cmd =~ /^r$/ && do { |
2811 | ||
69893cff | 2812 | # Can't do anythign if the program's over. |
e22ea7cc RF |
2813 | end_report(), next CMD if $finished and $level <= 1; |
2814 | ||
69893cff | 2815 | # Turn on stack trace. |
e22ea7cc RF |
2816 | $stack[$stack_depth] |= 1; |
2817 | ||
69893cff | 2818 | # Print return value unless the stack is empty. |
e22ea7cc RF |
2819 | $doret = $option{PrintRet} ? $stack_depth - 1 : -2; |
2820 | last CMD; | |
2821 | }; | |
69893cff | 2822 | |
69893cff RGS |
2823 | =head4 C<T> - stack trace |
2824 | ||
2825 | Just calls C<DB::print_trace>. | |
2826 | ||
2827 | =cut | |
2828 | ||
e22ea7cc RF |
2829 | $cmd =~ /^T$/ && do { |
2830 | print_trace( $OUT, 1 ); # skip DB | |
2831 | next CMD; | |
2832 | }; | |
69893cff RGS |
2833 | |
2834 | =head4 C<w> - List window around current line. | |
2835 | ||
2836 | Just calls C<DB::cmd_w>. | |
2837 | ||
2838 | =cut | |
2839 | ||
e22ea7cc | 2840 | $cmd =~ /^w\b\s*(.*)/s && do { &cmd_w( 'w', $1 ); next CMD; }; |
69893cff RGS |
2841 | |
2842 | =head4 C<W> - watch-expression processing. | |
2843 | ||
2844 | Just calls C<DB::cmd_W>. | |
2845 | ||
2846 | =cut | |
2847 | ||
e22ea7cc | 2848 | $cmd =~ /^W\b\s*(.*)/s && do { &cmd_W( 'W', $1 ); next CMD; }; |
69893cff RGS |
2849 | |
2850 | =head4 C</> - search forward for a string in the source | |
2851 | ||
2852 | We take the argument and treat it as a pattern. If it turns out to be a | |
2853 | bad one, we return the error we got from trying to C<eval> it and exit. | |
2854 | If not, we create some code to do the search and C<eval> it so it can't | |
2855 | mess us up. | |
2856 | ||
2857 | =cut | |
2858 | ||
e22ea7cc | 2859 | $cmd =~ /^\/(.*)$/ && do { |
69893cff RGS |
2860 | |
2861 | # The pattern as a string. | |
e22ea7cc | 2862 | $inpat = $1; |
69893cff RGS |
2863 | |
2864 | # Remove the final slash. | |
e22ea7cc | 2865 | $inpat =~ s:([^\\])/$:$1:; |
69893cff RGS |
2866 | |
2867 | # If the pattern isn't null ... | |
e22ea7cc | 2868 | if ( $inpat ne "" ) { |
69893cff RGS |
2869 | |
2870 | # Turn of warn and die procesing for a bit. | |
e22ea7cc RF |
2871 | local $SIG{__DIE__}; |
2872 | local $SIG{__WARN__}; | |
69893cff RGS |
2873 | |
2874 | # Create the pattern. | |
e22ea7cc RF |
2875 | eval '$inpat =~ m' . "\a$inpat\a"; |
2876 | if ( $@ ne "" ) { | |
2877 | ||
69893cff | 2878 | # Oops. Bad pattern. No biscuit. |
e22ea7cc | 2879 | # Print the eval error and go back for more |
69893cff | 2880 | # commands. |
e22ea7cc RF |
2881 | print $OUT "$@"; |
2882 | next CMD; | |
2883 | } | |
2884 | $pat = $inpat; | |
2885 | } ## end if ($inpat ne "") | |
69893cff RGS |
2886 | |
2887 | # Set up to stop on wrap-around. | |
e22ea7cc | 2888 | $end = $start; |
69893cff RGS |
2889 | |
2890 | # Don't move off the current line. | |
e22ea7cc | 2891 | $incr = -1; |
69893cff RGS |
2892 | |
2893 | # Done in eval so nothing breaks if the pattern | |
2894 | # does something weird. | |
e22ea7cc RF |
2895 | eval ' |
2896 | for (;;) { | |
69893cff | 2897 | # Move ahead one line. |
e22ea7cc | 2898 | ++$start; |
69893cff RGS |
2899 | |
2900 | # Wrap if we pass the last line. | |
e22ea7cc | 2901 | $start = 1 if ($start > $max); |
69893cff RGS |
2902 | |
2903 | # Stop if we have gotten back to this line again, | |
e22ea7cc | 2904 | last if ($start == $end); |
69893cff RGS |
2905 | |
2906 | # A hit! (Note, though, that we are doing | |
2907 | # case-insensitive matching. Maybe a qr// | |
2908 | # expression would be better, so the user could | |
2909 | # do case-sensitive matching if desired. | |
e22ea7cc RF |
2910 | if ($dbline[$start] =~ m' . "\a$pat\a" . 'i) { |
2911 | if ($slave_editor) { | |
69893cff | 2912 | # Handle proper escaping in the slave. |
e22ea7cc RF |
2913 | print $OUT "\032\032$filename:$start:0\n"; |
2914 | } | |
2915 | else { | |
69893cff | 2916 | # Just print the line normally. |
e22ea7cc RF |
2917 | print $OUT "$start:\t",$dbline[$start],"\n"; |
2918 | } | |
69893cff | 2919 | # And quit since we found something. |
e22ea7cc RF |
2920 | last; |
2921 | } | |
2922 | } '; | |
2923 | ||
69893cff | 2924 | # If we wrapped, there never was a match. |
e22ea7cc RF |
2925 | print $OUT "/$pat/: not found\n" if ( $start == $end ); |
2926 | next CMD; | |
2927 | }; | |
69893cff RGS |
2928 | |
2929 | =head4 C<?> - search backward for a string in the source | |
2930 | ||
2931 | Same as for C</>, except the loop runs backwards. | |
2932 | ||
2933 | =cut | |
2934 | ||
2935 | # ? - backward pattern search. | |
e22ea7cc | 2936 | $cmd =~ /^\?(.*)$/ && do { |
69893cff RGS |
2937 | |
2938 | # Get the pattern, remove trailing question mark. | |
e22ea7cc RF |
2939 | $inpat = $1; |
2940 | $inpat =~ s:([^\\])\?$:$1:; | |
69893cff RGS |
2941 | |
2942 | # If we've got one ... | |
e22ea7cc | 2943 | if ( $inpat ne "" ) { |
69893cff RGS |
2944 | |
2945 | # Turn off die & warn handlers. | |
e22ea7cc RF |
2946 | local $SIG{__DIE__}; |
2947 | local $SIG{__WARN__}; | |
2948 | eval '$inpat =~ m' . "\a$inpat\a"; | |
2949 | ||
2950 | if ( $@ ne "" ) { | |
2951 | ||
69893cff | 2952 | # Ouch. Not good. Print the error. |
e22ea7cc RF |
2953 | print $OUT $@; |
2954 | next CMD; | |
2955 | } | |
2956 | $pat = $inpat; | |
69893cff | 2957 | } ## end if ($inpat ne "") |
e22ea7cc | 2958 | |
69893cff | 2959 | # Where we are now is where to stop after wraparound. |
e22ea7cc | 2960 | $end = $start; |
69893cff RGS |
2961 | |
2962 | # Don't move away from this line. | |
e22ea7cc | 2963 | $incr = -1; |
69893cff RGS |
2964 | |
2965 | # Search inside the eval to prevent pattern badness | |
2966 | # from killing us. | |
e22ea7cc RF |
2967 | eval ' |
2968 | for (;;) { | |
69893cff | 2969 | # Back up a line. |
e22ea7cc | 2970 | --$start; |
69893cff RGS |
2971 | |
2972 | # Wrap if we pass the first line. | |
e22ea7cc RF |
2973 | |
2974 | $start = $max if ($start <= 0); | |
69893cff RGS |
2975 | |
2976 | # Quit if we get back where we started, | |
e22ea7cc | 2977 | last if ($start == $end); |
69893cff RGS |
2978 | |
2979 | # Match? | |
e22ea7cc RF |
2980 | if ($dbline[$start] =~ m' . "\a$pat\a" . 'i) { |
2981 | if ($slave_editor) { | |
69893cff | 2982 | # Yep, follow slave editor requirements. |
e22ea7cc RF |
2983 | print $OUT "\032\032$filename:$start:0\n"; |
2984 | } | |
2985 | else { | |
69893cff | 2986 | # Yep, just print normally. |
e22ea7cc RF |
2987 | print $OUT "$start:\t",$dbline[$start],"\n"; |
2988 | } | |
69893cff RGS |
2989 | |
2990 | # Found, so done. | |
e22ea7cc RF |
2991 | last; |
2992 | } | |
2993 | } '; | |
2994 | ||
2995 | # Say we failed if the loop never found anything, | |
2996 | print $OUT "?$pat?: not found\n" if ( $start == $end ); | |
2997 | next CMD; | |
2998 | }; | |
69893cff RGS |
2999 | |
3000 | =head4 C<$rc> - Recall command | |
3001 | ||
3002 | Manages the commands in C<@hist> (which is created if C<Term::ReadLine> reports | |
3003 | that the terminal supports history). It find the the command required, puts it | |
3004 | into C<$cmd>, and redoes the loop to execute it. | |
3005 | ||
3006 | =cut | |
3007 | ||
e22ea7cc RF |
3008 | # $rc - recall command. |
3009 | $cmd =~ /^$rc+\s*(-)?(\d+)?$/ && do { | |
69893cff RGS |
3010 | |
3011 | # No arguments, take one thing off history. | |
e22ea7cc | 3012 | pop(@hist) if length($cmd) > 1; |
69893cff | 3013 | |
e22ea7cc | 3014 | # Relative (- found)? |
69893cff | 3015 | # Y - index back from most recent (by 1 if bare minus) |
e22ea7cc | 3016 | # N - go to that particular command slot or the last |
69893cff | 3017 | # thing if nothing following. |
e22ea7cc | 3018 | $i = $1 ? ( $#hist - ( $2 || 1 ) ) : ( $2 || $#hist ); |
69893cff RGS |
3019 | |
3020 | # Pick out the command desired. | |
e22ea7cc | 3021 | $cmd = $hist[$i]; |
69893cff RGS |
3022 | |
3023 | # Print the command to be executed and restart the loop | |
3024 | # with that command in the buffer. | |
e22ea7cc RF |
3025 | print $OUT $cmd, "\n"; |
3026 | redo CMD; | |
3027 | }; | |
69893cff RGS |
3028 | |
3029 | =head4 C<$sh$sh> - C<system()> command | |
3030 | ||
3031 | Calls the C<DB::system()> to handle the command. This keeps the C<STDIN> and | |
3032 | C<STDOUT> from getting messed up. | |
3033 | ||
3034 | =cut | |
3035 | ||
3036 | # $sh$sh - run a shell command (if it's all ASCII). | |
3037 | # Can't run shell commands with Unicode in the debugger, hmm. | |
e22ea7cc RF |
3038 | $cmd =~ /^$sh$sh\s*([\x00-\xff]*)/ && do { |
3039 | ||
69893cff | 3040 | # System it. |
e22ea7cc RF |
3041 | &system($1); |
3042 | next CMD; | |
3043 | }; | |
69893cff RGS |
3044 | |
3045 | =head4 C<$rc I<pattern> $rc> - Search command history | |
3046 | ||
3047 | Another command to manipulate C<@hist>: this one searches it with a pattern. | |
be9a9b1d | 3048 | If a command is found, it is placed in C<$cmd> and executed via C<redo>. |
69893cff RGS |
3049 | |
3050 | =cut | |
3051 | ||
e22ea7cc RF |
3052 | # $rc pattern $rc - find a command in the history. |
3053 | $cmd =~ /^$rc([^$rc].*)$/ && do { | |
3054 | ||
69893cff | 3055 | # Create the pattern to use. |
e22ea7cc | 3056 | $pat = "^$1"; |
69893cff RGS |
3057 | |
3058 | # Toss off last entry if length is >1 (and it always is). | |
e22ea7cc | 3059 | pop(@hist) if length($cmd) > 1; |
69893cff RGS |
3060 | |
3061 | # Look backward through the history. | |
e22ea7cc RF |
3062 | for ( $i = $#hist ; $i ; --$i ) { |
3063 | ||
69893cff | 3064 | # Stop if we find it. |
e22ea7cc RF |
3065 | last if $hist[$i] =~ /$pat/; |
3066 | } | |
3067 | ||
3068 | if ( !$i ) { | |
69893cff | 3069 | |
69893cff | 3070 | # Never found it. |
e22ea7cc RF |
3071 | print $OUT "No such command!\n\n"; |
3072 | next CMD; | |
3073 | } | |
69893cff RGS |
3074 | |
3075 | # Found it. Put it in the buffer, print it, and process it. | |
e22ea7cc RF |
3076 | $cmd = $hist[$i]; |
3077 | print $OUT $cmd, "\n"; | |
3078 | redo CMD; | |
3079 | }; | |
69893cff RGS |
3080 | |
3081 | =head4 C<$sh> - Invoke a shell | |
3082 | ||
3083 | Uses C<DB::system> to invoke a shell. | |
3084 | ||
3085 | =cut | |
3086 | ||
3087 | # $sh - start a shell. | |
e22ea7cc RF |
3088 | $cmd =~ /^$sh$/ && do { |
3089 | ||
69893cff RGS |
3090 | # Run the user's shell. If none defined, run Bourne. |
3091 | # We resume execution when the shell terminates. | |
e22ea7cc RF |
3092 | &system( $ENV{SHELL} || "/bin/sh" ); |
3093 | next CMD; | |
3094 | }; | |
69893cff RGS |
3095 | |
3096 | =head4 C<$sh I<command>> - Force execution of a command in a shell | |
3097 | ||
3098 | Like the above, but the command is passed to the shell. Again, we use | |
3099 | C<DB::system> to avoid problems with C<STDIN> and C<STDOUT>. | |
3100 | ||
3101 | =cut | |
3102 | ||
3103 | # $sh command - start a shell and run a command in it. | |
e22ea7cc RF |
3104 | $cmd =~ /^$sh\s*([\x00-\xff]*)/ && do { |
3105 | ||
3106 | # XXX: using csh or tcsh destroys sigint retvals! | |
3107 | #&system($1); # use this instead | |
69893cff RGS |
3108 | |
3109 | # use the user's shell, or Bourne if none defined. | |
e22ea7cc RF |
3110 | &system( $ENV{SHELL} || "/bin/sh", "-c", $1 ); |
3111 | next CMD; | |
3112 | }; | |
69893cff RGS |
3113 | |
3114 | =head4 C<H> - display commands in history | |
3115 | ||
3116 | Prints the contents of C<@hist> (if any). | |
3117 | ||
3118 | =cut | |
3119 | ||
7fddc82f RF |
3120 | $cmd =~ /^H\b\s*\*/ && do { |
3121 | @hist = @truehist = (); | |
3122 | print $OUT "History cleansed\n"; | |
3123 | next CMD; | |
3124 | }; | |
e22ea7cc RF |
3125 | |
3126 | $cmd =~ /^H\b\s*(-(\d+))?/ && do { | |
3127 | ||
3128 | # Anything other than negative numbers is ignored by | |
69893cff | 3129 | # the (incorrect) pattern, so this test does nothing. |
e22ea7cc | 3130 | $end = $2 ? ( $#hist - $2 ) : 0; |
69893cff RGS |
3131 | |
3132 | # Set to the minimum if less than zero. | |
e22ea7cc | 3133 | $hist = 0 if $hist < 0; |
69893cff | 3134 | |
e22ea7cc | 3135 | # Start at the end of the array. |
69893cff RGS |
3136 | # Stay in while we're still above the ending value. |
3137 | # Tick back by one each time around the loop. | |
e22ea7cc | 3138 | for ( $i = $#hist ; $i > $end ; $i-- ) { |
69893cff RGS |
3139 | |
3140 | # Print the command unless it has no arguments. | |
e22ea7cc RF |
3141 | print $OUT "$i: ", $hist[$i], "\n" |
3142 | unless $hist[$i] =~ /^.?$/; | |
3143 | } | |
3144 | next CMD; | |
3145 | }; | |
69893cff RGS |
3146 | |
3147 | =head4 C<man, doc, perldoc> - look up documentation | |
3148 | ||
3149 | Just calls C<runman()> to print the appropriate document. | |
3150 | ||
3151 | =cut | |
3152 | ||
e22ea7cc RF |
3153 | # man, perldoc, doc - show manual pages. |
3154 | $cmd =~ /^(?:man|(?:perl)?doc)\b(?:\s+([^(]*))?$/ && do { | |
3155 | runman($1); | |
3156 | next CMD; | |
3157 | }; | |
69893cff RGS |
3158 | |
3159 | =head4 C<p> - print | |
3160 | ||
3161 | Builds a C<print EXPR> expression in the C<$cmd>; this will get executed at | |
3162 | the bottom of the loop. | |
3163 | ||
3164 | =cut | |
3165 | ||
3166 | # p - print (no args): print $_. | |
e22ea7cc | 3167 | $cmd =~ s/^p$/print {\$DB::OUT} \$_/; |
69893cff RGS |
3168 | |
3169 | # p - print the given expression. | |
e22ea7cc | 3170 | $cmd =~ s/^p\b/print {\$DB::OUT} /; |
69893cff RGS |
3171 | |
3172 | =head4 C<=> - define command alias | |
3173 | ||
3174 | Manipulates C<%alias> to add or list command aliases. | |
3175 | ||
3176 | =cut | |
3177 | ||
e22ea7cc RF |
3178 | # = - set up a command alias. |
3179 | $cmd =~ s/^=\s*// && do { | |
3180 | my @keys; | |
3181 | if ( length $cmd == 0 ) { | |
3182 | ||
69893cff | 3183 | # No args, get current aliases. |
e22ea7cc RF |
3184 | @keys = sort keys %alias; |
3185 | } | |
3186 | elsif ( my ( $k, $v ) = ( $cmd =~ /^(\S+)\s+(\S.*)/ ) ) { | |
3187 | ||
69893cff RGS |
3188 | # Creating a new alias. $k is alias name, $v is |
3189 | # alias value. | |
3190 | ||
e22ea7cc RF |
3191 | # can't use $_ or kill //g state |
3192 | for my $x ( $k, $v ) { | |
3193 | ||
3194 | # Escape "alarm" characters. | |
3195 | $x =~ s/\a/\\a/g; | |
3196 | } | |
69893cff RGS |
3197 | |
3198 | # Substitute key for value, using alarm chars | |
e22ea7cc | 3199 | # as separators (which is why we escaped them in |
69893cff | 3200 | # the command). |
e22ea7cc | 3201 | $alias{$k} = "s\a$k\a$v\a"; |
69893cff RGS |
3202 | |
3203 | # Turn off standard warn and die behavior. | |
e22ea7cc RF |
3204 | local $SIG{__DIE__}; |
3205 | local $SIG{__WARN__}; | |
69893cff RGS |
3206 | |
3207 | # Is it valid Perl? | |
e22ea7cc RF |
3208 | unless ( eval "sub { s\a$k\a$v\a }; 1" ) { |
3209 | ||
69893cff | 3210 | # Nope. Bad alias. Say so and get out. |
e22ea7cc RF |
3211 | print $OUT "Can't alias $k to $v: $@\n"; |
3212 | delete $alias{$k}; | |
3213 | next CMD; | |
3214 | } | |
3215 | ||
69893cff | 3216 | # We'll only list the new one. |
e22ea7cc | 3217 | @keys = ($k); |
69893cff RGS |
3218 | } ## end elsif (my ($k, $v) = ($cmd... |
3219 | ||
3220 | # The argument is the alias to list. | |
e22ea7cc RF |
3221 | else { |
3222 | @keys = ($cmd); | |
3223 | } | |
69893cff RGS |
3224 | |
3225 | # List aliases. | |
e22ea7cc RF |
3226 | for my $k (@keys) { |
3227 | ||
69893cff RGS |
3228 | # Messy metaquoting: Trim the substiution code off. |
3229 | # We use control-G as the delimiter because it's not | |
3230 | # likely to appear in the alias. | |
e22ea7cc RF |
3231 | if ( ( my $v = $alias{$k} ) =~ s\as\a$k\a(.*)\a$\a1\a ) { |
3232 | ||
69893cff | 3233 | # Print the alias. |
e22ea7cc RF |
3234 | print $OUT "$k\t= $1\n"; |
3235 | } | |
3236 | elsif ( defined $alias{$k} ) { | |
3237 | ||
69893cff | 3238 | # Couldn't trim it off; just print the alias code. |
e22ea7cc RF |
3239 | print $OUT "$k\t$alias{$k}\n"; |
3240 | } | |
3241 | else { | |
3242 | ||
69893cff | 3243 | # No such, dude. |
e22ea7cc RF |
3244 | print "No alias for $k\n"; |
3245 | } | |
69893cff | 3246 | } ## end for my $k (@keys) |
e22ea7cc RF |
3247 | next CMD; |
3248 | }; | |
69893cff RGS |
3249 | |
3250 | =head4 C<source> - read commands from a file. | |
3251 | ||
3252 | Opens a lexical filehandle and stacks it on C<@cmdfhs>; C<DB::readline> will | |
3253 | pick it up. | |
3254 | ||
3255 | =cut | |
3256 | ||
e22ea7cc RF |
3257 | # source - read commands from a file (or pipe!) and execute. |
3258 | $cmd =~ /^source\s+(.*\S)/ && do { | |
3259 | if ( open my $fh, $1 ) { | |
3260 | ||
69893cff | 3261 | # Opened OK; stick it in the list of file handles. |
e22ea7cc RF |
3262 | push @cmdfhs, $fh; |
3263 | } | |
3264 | else { | |
3265 | ||
3266 | # Couldn't open it. | |
3267 | &warn("Can't execute `$1': $!\n"); | |
3268 | } | |
3269 | next CMD; | |
3270 | }; | |
69893cff RGS |
3271 | |
3272 | =head4 C<save> - send current history to a file | |
3273 | ||
3274 | Takes the complete history, (not the shrunken version you see with C<H>), | |
3275 | and saves it to the given filename, so it can be replayed using C<source>. | |
3276 | ||
3277 | Note that all C<^(save|source)>'s are commented out with a view to minimise recursion. | |
3278 | ||
3279 | =cut | |
3280 | ||
3281 | # save source - write commands to a file for later use | |
3282 | $cmd =~ /^save\s*(.*)$/ && do { | |
e22ea7cc RF |
3283 | my $file = $1 || '.perl5dbrc'; # default? |
3284 | if ( open my $fh, "> $file" ) { | |
3285 | ||
3286 | # chomp to remove extraneous newlines from source'd files | |
3287 | chomp( my @truelist = | |
3288 | map { m/^\s*(save|source)/ ? "#$_" : $_ } | |
3289 | @truehist ); | |
3290 | print $fh join( "\n", @truelist ); | |
69893cff | 3291 | print "commands saved in $file\n"; |
e22ea7cc RF |
3292 | } |
3293 | else { | |
69893cff RGS |
3294 | &warn("Can't save debugger commands in '$1': $!\n"); |
3295 | } | |
3296 | next CMD; | |
3297 | }; | |
3298 | ||
7fddc82f RF |
3299 | =head4 C<R> - restart |
3300 | ||
3301 | Restart the debugger session. | |
3302 | ||
3303 | =head4 C<rerun> - rerun the current session | |
3304 | ||
3305 | Return to any given position in the B<true>-history list | |
3306 | ||
3307 | =cut | |
3308 | ||
3309 | # R - restart execution. | |
3310 | # rerun - controlled restart execution. | |
3311 | $cmd =~ /^(R|rerun\s*(.*))$/ && do { | |
3312 | my @args = ($1 eq 'R' ? restart() : rerun($2)); | |
3313 | ||
ca28b541 AP |
3314 | # Close all non-system fds for a clean restart. A more |
3315 | # correct method would be to close all fds that were not | |
3316 | # open when the process started, but this seems to be | |
3317 | # hard. See "debugger 'R'estart and open database | |
3318 | # connections" on p5p. | |
3319 | ||
47d3bbda | 3320 | my $max_fd = 1024; # default if POSIX can't be loaded |
ca28b541 AP |
3321 | if (eval { require POSIX }) { |
3322 | $max_fd = POSIX::sysconf(POSIX::_SC_OPEN_MAX()); | |
3323 | } | |
3324 | ||
3325 | if (defined $max_fd) { | |
3326 | foreach ($^F+1 .. $max_fd-1) { | |
3327 | next unless open FD_TO_CLOSE, "<&=$_"; | |
3328 | close(FD_TO_CLOSE); | |
3329 | } | |
3330 | } | |
3331 | ||
7fddc82f RF |
3332 | # And run Perl again. We use exec() to keep the |
3333 | # PID stable (and that way $ini_pids is still valid). | |
3334 | exec(@args) || print $OUT "exec failed: $!\n"; | |
3335 | ||
3336 | last CMD; | |
3337 | }; | |
3338 | ||
69893cff RGS |
3339 | =head4 C<|, ||> - pipe output through the pager. |
3340 | ||
be9a9b1d | 3341 | For C<|>, we save C<OUT> (the debugger's output filehandle) and C<STDOUT> |
69893cff RGS |
3342 | (the program's standard output). For C<||>, we only save C<OUT>. We open a |
3343 | pipe to the pager (restoring the output filehandles if this fails). If this | |
3344 | is the C<|> command, we also set up a C<SIGPIPE> handler which will simply | |
3345 | set C<$signal>, sending us back into the debugger. | |
3346 | ||
3347 | We then trim off the pipe symbols and C<redo> the command loop at the | |
3348 | C<PIPE> label, causing us to evaluate the command in C<$cmd> without | |
3349 | reading another. | |
3350 | ||
3351 | =cut | |
3352 | ||
3353 | # || - run command in the pager, with output to DB::OUT. | |
e22ea7cc RF |
3354 | $cmd =~ /^\|\|?\s*[^|]/ && do { |
3355 | if ( $pager =~ /^\|/ ) { | |
3356 | ||
69893cff | 3357 | # Default pager is into a pipe. Redirect I/O. |
e22ea7cc RF |
3358 | open( SAVEOUT, ">&STDOUT" ) |
3359 | || &warn("Can't save STDOUT"); | |
3360 | open( STDOUT, ">&OUT" ) | |
3361 | || &warn("Can't redirect STDOUT"); | |
69893cff | 3362 | } ## end if ($pager =~ /^\|/) |
e22ea7cc RF |
3363 | else { |
3364 | ||
69893cff | 3365 | # Not into a pipe. STDOUT is safe. |
e22ea7cc RF |
3366 | open( SAVEOUT, ">&OUT" ) || &warn("Can't save DB::OUT"); |
3367 | } | |
69893cff RGS |
3368 | |
3369 | # Fix up environment to record we have less if so. | |
e22ea7cc RF |
3370 | fix_less(); |
3371 | ||
3372 | unless ( $piped = open( OUT, $pager ) ) { | |
69893cff | 3373 | |
69893cff | 3374 | # Couldn't open pipe to pager. |
e22ea7cc RF |
3375 | &warn("Can't pipe output to `$pager'"); |
3376 | if ( $pager =~ /^\|/ ) { | |
3377 | ||
69893cff | 3378 | # Redirect I/O back again. |
e22ea7cc RF |
3379 | open( OUT, ">&STDOUT" ) # XXX: lost message |
3380 | || &warn("Can't restore DB::OUT"); | |
3381 | open( STDOUT, ">&SAVEOUT" ) | |
3382 | || &warn("Can't restore STDOUT"); | |
3383 | close(SAVEOUT); | |
69893cff | 3384 | } ## end if ($pager =~ /^\|/) |
e22ea7cc RF |
3385 | else { |
3386 | ||
69893cff | 3387 | # Redirect I/O. STDOUT already safe. |
e22ea7cc RF |
3388 | open( OUT, ">&STDOUT" ) # XXX: lost message |
3389 | || &warn("Can't restore DB::OUT"); | |
3390 | } | |
3391 | next CMD; | |
69893cff RGS |
3392 | } ## end unless ($piped = open(OUT,... |
3393 | ||
3394 | # Set up broken-pipe handler if necessary. | |
e22ea7cc RF |
3395 | $SIG{PIPE} = \&DB::catch |
3396 | if $pager =~ /^\|/ | |
3397 | && ( "" eq $SIG{PIPE} || "DEFAULT" eq $SIG{PIPE} ); | |
69893cff RGS |
3398 | |
3399 | # Save current filehandle, unbuffer out, and put it back. | |
e22ea7cc RF |
3400 | $selected = select(OUT); |
3401 | $| = 1; | |
69893cff RGS |
3402 | |
3403 | # Don't put it back if pager was a pipe. | |
e22ea7cc | 3404 | select($selected), $selected = "" unless $cmd =~ /^\|\|/; |
69893cff RGS |
3405 | |
3406 | # Trim off the pipe symbols and run the command now. | |
e22ea7cc RF |
3407 | $cmd =~ s/^\|+\s*//; |
3408 | redo PIPE; | |
3409 | }; | |
69893cff RGS |
3410 | |
3411 | =head3 END OF COMMAND PARSING | |
3412 | ||
3413 | Anything left in C<$cmd> at this point is a Perl expression that we want to | |
3414 | evaluate. We'll always evaluate in the user's context, and fully qualify | |
3415 | any variables we might want to address in the C<DB> package. | |
3416 | ||
3417 | =cut | |
3418 | ||
3419 | # t - turn trace on. | |
e22ea7cc | 3420 | $cmd =~ s/^t\s/\$DB::trace |= 1;\n/; |
69893cff RGS |
3421 | |
3422 | # s - single-step. Remember the last command was 's'. | |
e22ea7cc | 3423 | $cmd =~ s/^s\s/\$DB::single = 1;\n/ && do { $laststep = 's' }; |
69893cff RGS |
3424 | |
3425 | # n - single-step, but not into subs. Remember last command | |
e22ea7cc RF |
3426 | # was 'n'. |
3427 | $cmd =~ s/^n\s/\$DB::single = 2;\n/ && do { $laststep = 'n' }; | |
69893cff | 3428 | |
e22ea7cc | 3429 | } # PIPE: |
69893cff | 3430 | |
e22ea7cc | 3431 | # Make sure the flag that says "the debugger's running" is |
69893cff | 3432 | # still on, to make sure we get control again. |
e22ea7cc | 3433 | $evalarg = "\$^D = \$^D | \$DB::db_stop;\n$cmd"; |
69893cff RGS |
3434 | |
3435 | # Run *our* eval that executes in the caller's context. | |
e22ea7cc | 3436 | &eval; |
69893cff RGS |
3437 | |
3438 | # Turn off the one-time-dump stuff now. | |
e22ea7cc RF |
3439 | if ($onetimeDump) { |
3440 | $onetimeDump = undef; | |
69893cff | 3441 | $onetimedumpDepth = undef; |
e22ea7cc RF |
3442 | } |
3443 | elsif ( $term_pid == $$ ) { | |
c7e68384 IZ |
3444 | eval { # May run under miniperl, when not available... |
3445 | STDOUT->flush(); | |
3446 | STDERR->flush(); | |
3447 | }; | |
e22ea7cc | 3448 | |
69893cff | 3449 | # XXX If this is the master pid, print a newline. |
e22ea7cc RF |
3450 | print $OUT "\n"; |
3451 | } | |
3452 | } ## end while (($term || &setterm... | |
69893cff RGS |
3453 | |
3454 | =head3 POST-COMMAND PROCESSING | |
3455 | ||
3456 | After each command, we check to see if the command output was piped anywhere. | |
3457 | If so, we go through the necessary code to unhook the pipe and go back to | |
3458 | our standard filehandles for input and output. | |
3459 | ||
3460 | =cut | |
3461 | ||
e22ea7cc | 3462 | continue { # CMD: |
69893cff RGS |
3463 | |
3464 | # At the end of every command: | |
e22ea7cc RF |
3465 | if ($piped) { |
3466 | ||
69893cff | 3467 | # Unhook the pipe mechanism now. |
e22ea7cc RF |
3468 | if ( $pager =~ /^\|/ ) { |
3469 | ||
69893cff | 3470 | # No error from the child. |
e22ea7cc | 3471 | $? = 0; |
69893cff | 3472 | |
e22ea7cc RF |
3473 | # we cannot warn here: the handle is missing --tchrist |
3474 | close(OUT) || print SAVEOUT "\nCan't close DB::OUT\n"; | |
69893cff | 3475 | |
e22ea7cc | 3476 | # most of the $? crud was coping with broken cshisms |
69893cff | 3477 | # $? is explicitly set to 0, so this never runs. |
e22ea7cc RF |
3478 | if ($?) { |
3479 | print SAVEOUT "Pager `$pager' failed: "; | |
3480 | if ( $? == -1 ) { | |
3481 | print SAVEOUT "shell returned -1\n"; | |
3482 | } | |
3483 | elsif ( $? >> 8 ) { | |
3484 | print SAVEOUT ( $? & 127 ) | |
3485 | ? " (SIG#" . ( $? & 127 ) . ")" | |
3486 | : "", ( $? & 128 ) ? " -- core dumped" : "", "\n"; | |
3487 | } | |
3488 | else { | |
3489 | print SAVEOUT "status ", ( $? >> 8 ), "\n"; | |
3490 | } | |
69893cff RGS |
3491 | } ## end if ($?) |
3492 | ||
e22ea7cc | 3493 | # Reopen filehandle for our output (if we can) and |
69893cff | 3494 | # restore STDOUT (if we can). |
e22ea7cc RF |
3495 | open( OUT, ">&STDOUT" ) || &warn("Can't restore DB::OUT"); |
3496 | open( STDOUT, ">&SAVEOUT" ) | |
3497 | || &warn("Can't restore STDOUT"); | |
69893cff RGS |
3498 | |
3499 | # Turn off pipe exception handler if necessary. | |
e22ea7cc | 3500 | $SIG{PIPE} = "DEFAULT" if $SIG{PIPE} eq \&DB::catch; |
69893cff | 3501 | |
e22ea7cc RF |
3502 | # Will stop ignoring SIGPIPE if done like nohup(1) |
3503 | # does SIGINT but Perl doesn't give us a choice. | |
69893cff | 3504 | } ## end if ($pager =~ /^\|/) |
e22ea7cc RF |
3505 | else { |
3506 | ||
69893cff | 3507 | # Non-piped "pager". Just restore STDOUT. |
e22ea7cc RF |
3508 | open( OUT, ">&SAVEOUT" ) || &warn("Can't restore DB::OUT"); |
3509 | } | |
69893cff RGS |
3510 | |
3511 | # Close filehandle pager was using, restore the normal one | |
3512 | # if necessary, | |
3513 | close(SAVEOUT); | |
e22ea7cc | 3514 | select($selected), $selected = "" unless $selected eq ""; |
69893cff RGS |
3515 | |
3516 | # No pipes now. | |
e22ea7cc | 3517 | $piped = ""; |
69893cff | 3518 | } ## end if ($piped) |
e22ea7cc | 3519 | } # CMD: |
69893cff RGS |
3520 | |
3521 | =head3 COMMAND LOOP TERMINATION | |
3522 | ||
3523 | When commands have finished executing, we come here. If the user closed the | |
3524 | input filehandle, we turn on C<$fall_off_end> to emulate a C<q> command. We | |
3525 | evaluate any post-prompt items. We restore C<$@>, C<$!>, C<$^E>, C<$,>, C<$/>, | |
3526 | C<$\>, and C<$^W>, and return a null list as expected by the Perl interpreter. | |
3527 | The interpreter will then execute the next line and then return control to us | |
3528 | again. | |
3529 | ||
3530 | =cut | |
3531 | ||
3532 | # No more commands? Quit. | |
e22ea7cc | 3533 | $fall_off_end = 1 unless defined $cmd; # Emulate `q' on EOF |
69893cff RGS |
3534 | |
3535 | # Evaluate post-prompt commands. | |
e22ea7cc RF |
3536 | foreach $evalarg (@$post) { |
3537 | &eval; | |
3538 | } | |
3539 | } # if ($single || $signal) | |
69893cff RGS |
3540 | |
3541 | # Put the user's globals back where you found them. | |
e22ea7cc | 3542 | ( $@, $!, $^E, $,, $/, $\, $^W ) = @saved; |
69893cff RGS |
3543 | (); |
3544 | } ## end sub DB | |
3545 | ||
3546 | # The following code may be executed now: | |
3547 | # BEGIN {warn 4} | |
3548 | ||
3549 | =head2 sub | |
3550 | ||
3551 | C<sub> is called whenever a subroutine call happens in the program being | |
3552 | debugged. The variable C<$DB::sub> contains the name of the subroutine | |
3553 | being called. | |
3554 | ||
3555 | The core function of this subroutine is to actually call the sub in the proper | |
3556 | context, capturing its output. This of course causes C<DB::DB> to get called | |
3557 | again, repeating until the subroutine ends and returns control to C<DB::sub> | |
3558 | again. Once control returns, C<DB::sub> figures out whether or not to dump the | |
3559 | return value, and returns its captured copy of the return value as its own | |
3560 | return value. The value then feeds back into the program being debugged as if | |
3561 | C<DB::sub> hadn't been there at all. | |
3562 | ||
3563 | C<sub> does all the work of printing the subroutine entry and exit messages | |
3564 | enabled by setting C<$frame>. It notes what sub the autoloader got called for, | |
3565 | and also prints the return value if needed (for the C<r> command and if | |
3566 | the 16 bit is set in C<$frame>). | |
3567 | ||
3568 | It also tracks the subroutine call depth by saving the current setting of | |
3569 | C<$single> in the C<@stack> package global; if this exceeds the value in | |
3570 | C<$deep>, C<sub> automatically turns on printing of the current depth by | |
be9a9b1d | 3571 | setting the C<4> bit in C<$single>. In any case, it keeps the current setting |
69893cff RGS |
3572 | of stop/don't stop on entry to subs set as it currently is set. |
3573 | ||
3574 | =head3 C<caller()> support | |
3575 | ||
3576 | If C<caller()> is called from the package C<DB>, it provides some | |
3577 | additional data, in the following order: | |
3578 | ||
3579 | =over 4 | |
3580 | ||
3581 | =item * C<$package> | |
3582 | ||
3583 | The package name the sub was in | |
3584 | ||
3585 | =item * C<$filename> | |
3586 | ||
3587 | The filename it was defined in | |
3588 | ||
3589 | =item * C<$line> | |
3590 | ||
3591 | The line number it was defined on | |
3592 | ||
3593 | =item * C<$subroutine> | |
3594 | ||
be9a9b1d | 3595 | The subroutine name; C<(eval)> if an C<eval>(). |
69893cff RGS |
3596 | |
3597 | =item * C<$hasargs> | |
3598 | ||
3599 | 1 if it has arguments, 0 if not | |
3600 | ||
3601 | =item * C<$wantarray> | |
3602 | ||
3603 | 1 if array context, 0 if scalar context | |
3604 | ||
3605 | =item * C<$evaltext> | |
3606 | ||
3607 | The C<eval>() text, if any (undefined for C<eval BLOCK>) | |
3608 | ||
3609 | =item * C<$is_require> | |
3610 | ||
3611 | frame was created by a C<use> or C<require> statement | |
3612 | ||
3613 | =item * C<$hints> | |
3614 | ||
3615 | pragma information; subject to change between versions | |
3616 | ||
3617 | =item * C<$bitmask> | |
3618 | ||
be9a9b1d | 3619 | pragma information; subject to change between versions |
69893cff RGS |
3620 | |
3621 | =item * C<@DB::args> | |
3622 | ||
3623 | arguments with which the subroutine was invoked | |
3624 | ||
3625 | =back | |
3626 | ||
3627 | =cut | |
d338d6fe | 3628 | |
d12a4851 | 3629 | sub sub { |
69893cff | 3630 | |
2cbb2ee1 RGS |
3631 | # lock ourselves under threads |
3632 | lock($DBGR); | |
3633 | ||
69893cff RGS |
3634 | # Whether or not the autoloader was running, a scalar to put the |
3635 | # sub's return value in (if needed), and an array to put the sub's | |
3636 | # return value in (if needed). | |
e22ea7cc | 3637 | my ( $al, $ret, @ret ) = ""; |
2cbb2ee1 RGS |
3638 | if ($sub =~ /^threads::new$/ && $ENV{PERL5DB_THREADED}) { |
3639 | print "creating new thread\n"; | |
3640 | } | |
69893cff | 3641 | |
c81c05fc | 3642 | # If the last ten characters are '::AUTOLOAD', note we've traced |
69893cff | 3643 | # into AUTOLOAD for $sub. |
e22ea7cc | 3644 | if ( length($sub) > 10 && substr( $sub, -10, 10 ) eq '::AUTOLOAD' ) { |
c81c05fc | 3645 | $al = " for $$sub" if defined $$sub; |
d12a4851 | 3646 | } |
69893cff RGS |
3647 | |
3648 | # We stack the stack pointer and then increment it to protect us | |
3649 | # from a situation that might unwind a whole bunch of call frames | |
3650 | # at once. Localizing the stack pointer means that it will automatically | |
3651 | # unwind the same amount when multiple stack frames are unwound. | |
e22ea7cc | 3652 | local $stack_depth = $stack_depth + 1; # Protect from non-local exits |
69893cff RGS |
3653 | |
3654 | # Expand @stack. | |
d12a4851 | 3655 | $#stack = $stack_depth; |
69893cff RGS |
3656 | |
3657 | # Save current single-step setting. | |
d12a4851 | 3658 | $stack[-1] = $single; |
69893cff | 3659 | |
e22ea7cc | 3660 | # Turn off all flags except single-stepping. |
d12a4851 | 3661 | $single &= 1; |
69893cff RGS |
3662 | |
3663 | # If we've gotten really deeply recursed, turn on the flag that will | |
3664 | # make us stop with the 'deep recursion' message. | |
d12a4851 | 3665 | $single |= 4 if $stack_depth == $deep; |
69893cff RGS |
3666 | |
3667 | # If frame messages are on ... | |
3668 | ( | |
3669 | $frame & 4 # Extended frame entry message | |
e22ea7cc RF |
3670 | ? ( |
3671 | print_lineinfo( ' ' x ( $stack_depth - 1 ), "in " ), | |
69893cff | 3672 | |
e22ea7cc | 3673 | # Why -1? But it works! :-( |
69893cff RGS |
3674 | # Because print_trace will call add 1 to it and then call |
3675 | # dump_trace; this results in our skipping -1+1 = 0 stack frames | |
3676 | # in dump_trace. | |
e22ea7cc RF |
3677 | print_trace( $LINEINFO, -1, 1, 1, "$sub$al" ) |
3678 | ) | |
3679 | : print_lineinfo( ' ' x ( $stack_depth - 1 ), "entering $sub$al\n" ) | |
3680 | ||
69893cff | 3681 | # standard frame entry message |
e22ea7cc RF |
3682 | ) |
3683 | if $frame; | |
69893cff RGS |
3684 | |
3685 | # Determine the sub's return type,and capture approppriately. | |
d12a4851 | 3686 | if (wantarray) { |
e22ea7cc | 3687 | |
69893cff RGS |
3688 | # Called in array context. call sub and capture output. |
3689 | # DB::DB will recursively get control again if appropriate; we'll come | |
3690 | # back here when the sub is finished. | |
584420f0 | 3691 | @ret = &$sub; |
69893cff RGS |
3692 | |
3693 | # Pop the single-step value back off the stack. | |
e22ea7cc | 3694 | $single |= $stack[ $stack_depth-- ]; |
69893cff RGS |
3695 | |
3696 | # Check for exit trace messages... | |
e22ea7cc RF |
3697 | ( |
3698 | $frame & 4 # Extended exit message | |
3699 | ? ( | |
3700 | print_lineinfo( ' ' x $stack_depth, "out " ), | |
3701 | print_trace( $LINEINFO, -1, 1, 1, "$sub$al" ) | |
3702 | ) | |
3703 | : print_lineinfo( ' ' x $stack_depth, "exited $sub$al\n" ) | |
3704 | ||
69893cff | 3705 | # Standard exit message |
e22ea7cc RF |
3706 | ) |
3707 | if $frame & 2; | |
69893cff RGS |
3708 | |
3709 | # Print the return info if we need to. | |
e22ea7cc RF |
3710 | if ( $doret eq $stack_depth or $frame & 16 ) { |
3711 | ||
69893cff | 3712 | # Turn off output record separator. |
e22ea7cc RF |
3713 | local $\ = ''; |
3714 | my $fh = ( $doret eq $stack_depth ? $OUT : $LINEINFO ); | |
69893cff RGS |
3715 | |
3716 | # Indent if we're printing because of $frame tracing. | |
e22ea7cc | 3717 | print $fh ' ' x $stack_depth if $frame & 16; |
69893cff RGS |
3718 | |
3719 | # Print the return value. | |
e22ea7cc RF |
3720 | print $fh "list context return from $sub:\n"; |
3721 | dumpit( $fh, \@ret ); | |
69893cff RGS |
3722 | |
3723 | # And don't print it again. | |
e22ea7cc | 3724 | $doret = -2; |
69893cff | 3725 | } ## end if ($doret eq $stack_depth... |
e22ea7cc RF |
3726 | # And we have to return the return value now. |
3727 | @ret; | |
69893cff RGS |
3728 | } ## end if (wantarray) |
3729 | ||
3730 | # Scalar context. | |
3731 | else { | |
584420f0 | 3732 | if ( defined wantarray ) { |
e22ea7cc | 3733 | |
584420f0 RGS |
3734 | # Save the value if it's wanted at all. |
3735 | $ret = &$sub; | |
3736 | } | |
3737 | else { | |
e22ea7cc | 3738 | |
584420f0 RGS |
3739 | # Void return, explicitly. |
3740 | &$sub; | |
3741 | undef $ret; | |
3742 | } | |
69893cff RGS |
3743 | |
3744 | # Pop the single-step value off the stack. | |
e22ea7cc | 3745 | $single |= $stack[ $stack_depth-- ]; |
69893cff RGS |
3746 | |
3747 | # If we're doing exit messages... | |
e22ea7cc RF |
3748 | ( |
3749 | $frame & 4 # Extended messsages | |
3750 | ? ( | |
3751 | print_lineinfo( ' ' x $stack_depth, "out " ), | |
3752 | print_trace( $LINEINFO, -1, 1, 1, "$sub$al" ) | |
3753 | ) | |
3754 | : print_lineinfo( ' ' x $stack_depth, "exited $sub$al\n" ) | |
3755 | ||
3756 | # Standard messages | |
3757 | ) | |
3758 | if $frame & 2; | |
69893cff RGS |
3759 | |
3760 | # If we are supposed to show the return value... same as before. | |
e22ea7cc RF |
3761 | if ( $doret eq $stack_depth or $frame & 16 and defined wantarray ) { |
3762 | local $\ = ''; | |
3763 | my $fh = ( $doret eq $stack_depth ? $OUT : $LINEINFO ); | |
3764 | print $fh ( ' ' x $stack_depth ) if $frame & 16; | |
3765 | print $fh ( | |
3766 | defined wantarray | |
3767 | ? "scalar context return from $sub: " | |
3768 | : "void context return from $sub\n" | |
3769 | ); | |
3770 | dumpit( $fh, $ret ) if defined wantarray; | |
3771 | $doret = -2; | |
69893cff RGS |
3772 | } ## end if ($doret eq $stack_depth... |
3773 | ||
3774 | # Return the appropriate scalar value. | |
e22ea7cc | 3775 | $ret; |
69893cff RGS |
3776 | } ## end else [ if (wantarray) |
3777 | } ## end sub sub | |
3778 | ||
3779 | =head1 EXTENDED COMMAND HANDLING AND THE COMMAND API | |
3780 | ||
3781 | In Perl 5.8.0, there was a major realignment of the commands and what they did, | |
3782 | Most of the changes were to systematize the command structure and to eliminate | |
3783 | commands that threw away user input without checking. | |
3784 | ||
3785 | The following sections describe the code added to make it easy to support | |
3786 | multiple command sets with conflicting command names. This section is a start | |
3787 | at unifying all command processing to make it simpler to develop commands. | |
3788 | ||
3789 | Note that all the cmd_[a-zA-Z] subroutines require the command name, a line | |
3790 | number, and C<$dbline> (the current line) as arguments. | |
3791 | ||
3792 | Support functions in this section which have multiple modes of failure C<die> | |
3793 | on error; the rest simply return a false value. | |
3794 | ||
3795 | The user-interface functions (all of the C<cmd_*> functions) just output | |
3796 | error messages. | |
3797 | ||
3798 | =head2 C<%set> | |
3799 | ||
3800 | The C<%set> hash defines the mapping from command letter to subroutine | |
3801 | name suffix. | |
3802 | ||
3803 | C<%set> is a two-level hash, indexed by set name and then by command name. | |
be9a9b1d AT |
3804 | Note that trying to set the CommandSet to C<foobar> simply results in the |
3805 | 5.8.0 command set being used, since there's no top-level entry for C<foobar>. | |
69893cff RGS |
3806 | |
3807 | =cut | |
d338d6fe | 3808 | |
d12a4851 | 3809 | ### The API section |
f1583d8f | 3810 | |
e22ea7cc RF |
3811 | my %set = ( # |
3812 | 'pre580' => { | |
3813 | 'a' => 'pre580_a', | |
3814 | 'A' => 'pre580_null', | |
3815 | 'b' => 'pre580_b', | |
3816 | 'B' => 'pre580_null', | |
3817 | 'd' => 'pre580_null', | |
3818 | 'D' => 'pre580_D', | |
3819 | 'h' => 'pre580_h', | |
3820 | 'M' => 'pre580_null', | |
3821 | 'O' => 'o', | |
3822 | 'o' => 'pre580_null', | |
3823 | 'v' => 'M', | |
3824 | 'w' => 'v', | |
3825 | 'W' => 'pre580_W', | |
69893cff | 3826 | }, |
e22ea7cc RF |
3827 | 'pre590' => { |
3828 | '<' => 'pre590_prepost', | |
3829 | '<<' => 'pre590_prepost', | |
3830 | '>' => 'pre590_prepost', | |
3831 | '>>' => 'pre590_prepost', | |
3832 | '{' => 'pre590_prepost', | |
3833 | '{{' => 'pre590_prepost', | |
69893cff | 3834 | }, |
d12a4851 | 3835 | ); |
492652be | 3836 | |
69893cff RGS |
3837 | =head2 C<cmd_wrapper()> (API) |
3838 | ||
3839 | C<cmd_wrapper()> allows the debugger to switch command sets | |
3840 | depending on the value of the C<CommandSet> option. | |
3841 | ||
be9a9b1d | 3842 | It tries to look up the command in the C<%set> package-level I<lexical> |
69893cff RGS |
3843 | (which means external entities can't fiddle with it) and create the name of |
3844 | the sub to call based on the value found in the hash (if it's there). I<All> | |
3845 | of the commands to be handled in a set have to be added to C<%set>; if they | |
3846 | aren't found, the 5.8.0 equivalent is called (if there is one). | |
3847 | ||
3848 | This code uses symbolic references. | |
3849 | ||
3850 | =cut | |
3851 | ||
d12a4851 | 3852 | sub cmd_wrapper { |
69893cff RGS |
3853 | my $cmd = shift; |
3854 | my $line = shift; | |
3855 | my $dblineno = shift; | |
3856 | ||
e22ea7cc | 3857 | # Assemble the command subroutine's name by looking up the |
69893cff RGS |
3858 | # command set and command name in %set. If we can't find it, |
3859 | # default to the older version of the command. | |
3860 | my $call = 'cmd_' | |
e22ea7cc RF |
3861 | . ( $set{$CommandSet}{$cmd} |
3862 | || ( $cmd =~ /^[<>{]+/o ? 'prepost' : $cmd ) ); | |
69893cff RGS |
3863 | |
3864 | # Call the command subroutine, call it by name. | |
e22ea7cc RF |
3865 | return &$call( $cmd, $line, $dblineno ); |
3866 | } ## end sub cmd_wrapper | |
492652be | 3867 | |
69893cff RGS |
3868 | =head3 C<cmd_a> (command) |
3869 | ||
3870 | The C<a> command handles pre-execution actions. These are associated with a | |
3871 | particular line, so they're stored in C<%dbline>. We default to the current | |
3872 | line if none is specified. | |
3873 | ||
3874 | =cut | |
3875 | ||
d12a4851 | 3876 | sub cmd_a { |
e22ea7cc RF |
3877 | my $cmd = shift; |
3878 | my $line = shift || ''; # [.|line] expr | |
3879 | my $dbline = shift; | |
69893cff RGS |
3880 | |
3881 | # If it's dot (here), or not all digits, use the current line. | |
3882 | $line =~ s/^(\.|(?:[^\d]))/$dbline/; | |
3883 | ||
e22ea7cc RF |
3884 | # Should be a line number followed by an expression. |
3885 | if ( $line =~ /^\s*(\d*)\s*(\S.+)/ ) { | |
3886 | my ( $lineno, $expr ) = ( $1, $2 ); | |
69893cff RGS |
3887 | |
3888 | # If we have an expression ... | |
e22ea7cc RF |
3889 | if ( length $expr ) { |
3890 | ||
69893cff | 3891 | # ... but the line isn't breakable, complain. |
e22ea7cc RF |
3892 | if ( $dbline[$lineno] == 0 ) { |
3893 | print $OUT | |
3894 | "Line $lineno($dbline[$lineno]) does not have an action?\n"; | |
3895 | } | |
69893cff | 3896 | else { |
e22ea7cc | 3897 | |
69893cff RGS |
3898 | # It's executable. Record that the line has an action. |
3899 | $had_breakpoints{$filename} |= 2; | |
3900 | ||
3901 | # Remove any action, temp breakpoint, etc. | |
3902 | $dbline{$lineno} =~ s/\0[^\0]*//; | |
3903 | ||
3904 | # Add the action to the line. | |
3905 | $dbline{$lineno} .= "\0" . action($expr); | |
3906 | } | |
3907 | } ## end if (length $expr) | |
3908 | } ## end if ($line =~ /^\s*(\d*)\s*(\S.+)/) | |
3909 | else { | |
e22ea7cc | 3910 | |
69893cff | 3911 | # Syntax wrong. |
e22ea7cc RF |
3912 | print $OUT |
3913 | "Adding an action requires an optional lineno and an expression\n" | |
3914 | ; # hint | |
69893cff RGS |
3915 | } |
3916 | } ## end sub cmd_a | |
3917 | ||
3918 | =head3 C<cmd_A> (command) | |
3919 | ||
3920 | Delete actions. Similar to above, except the delete code is in a separate | |
3921 | subroutine, C<delete_action>. | |
3922 | ||
3923 | =cut | |
492652be | 3924 | |
d12a4851 | 3925 | sub cmd_A { |
e22ea7cc | 3926 | my $cmd = shift; |
69893cff | 3927 | my $line = shift || ''; |
e22ea7cc | 3928 | my $dbline = shift; |
69893cff RGS |
3929 | |
3930 | # Dot is this line. | |
3931 | $line =~ s/^\./$dbline/; | |
3932 | ||
3933 | # Call delete_action with a null param to delete them all. | |
3934 | # The '1' forces the eval to be true. It'll be false only | |
3935 | # if delete_action blows up for some reason, in which case | |
3936 | # we print $@ and get out. | |
e22ea7cc | 3937 | if ( $line eq '*' ) { |
69893cff | 3938 | eval { &delete_action(); 1 } or print $OUT $@ and return; |
e22ea7cc RF |
3939 | } |
3940 | ||
69893cff RGS |
3941 | # There's a real line number. Pass it to delete_action. |
3942 | # Error trapping is as above. | |
e22ea7cc | 3943 | elsif ( $line =~ /^(\S.*)/ ) { |
69893cff | 3944 | eval { &delete_action($1); 1 } or print $OUT $@ and return; |
e22ea7cc | 3945 | } |
69893cff RGS |
3946 | |
3947 | # Swing and a miss. Bad syntax. | |
3948 | else { | |
e22ea7cc RF |
3949 | print $OUT |
3950 | "Deleting an action requires a line number, or '*' for all\n" ; # hint | |
69893cff RGS |
3951 | } |
3952 | } ## end sub cmd_A | |
3953 | ||
3954 | =head3 C<delete_action> (API) | |
3955 | ||
3956 | C<delete_action> accepts either a line number or C<undef>. If a line number | |
3957 | is specified, we check for the line being executable (if it's not, it | |
3958 | couldn't have had an action). If it is, we just take the action off (this | |
3959 | will get any kind of an action, including breakpoints). | |
3960 | ||
3961 | =cut | |
492652be | 3962 | |
d12a4851 | 3963 | sub delete_action { |
e22ea7cc RF |
3964 | my $i = shift; |
3965 | if ( defined($i) ) { | |
3966 | ||
69893cff RGS |
3967 | # Can there be one? |
3968 | die "Line $i has no action .\n" if $dbline[$i] == 0; | |
3969 | ||
3970 | # Nuke whatever's there. | |
e22ea7cc | 3971 | $dbline{$i} =~ s/\0[^\0]*//; # \^a |
69893cff | 3972 | delete $dbline{$i} if $dbline{$i} eq ''; |
e22ea7cc RF |
3973 | } |
3974 | else { | |
69893cff | 3975 | print $OUT "Deleting all actions...\n"; |
e22ea7cc RF |
3976 | for my $file ( keys %had_breakpoints ) { |
3977 | local *dbline = $main::{ '_<' . $file }; | |
69893cff RGS |
3978 | my $max = $#dbline; |
3979 | my $was; | |
e22ea7cc RF |
3980 | for ( $i = 1 ; $i <= $max ; $i++ ) { |
3981 | if ( defined $dbline{$i} ) { | |
3982 | $dbline{$i} =~ s/\0[^\0]*//; | |
3983 | delete $dbline{$i} if $dbline{$i} eq ''; | |
3984 | } | |
3985 | unless ( $had_breakpoints{$file} &= ~2 ) { | |
3986 | delete $had_breakpoints{$file}; | |
69893cff RGS |
3987 | } |
3988 | } ## end for ($i = 1 ; $i <= $max... | |
3989 | } ## end for my $file (keys %had_breakpoints) | |
3990 | } ## end else [ if (defined($i)) | |
3991 | } ## end sub delete_action | |
3992 | ||
3993 | =head3 C<cmd_b> (command) | |
3994 | ||
3995 | Set breakpoints. Since breakpoints can be set in so many places, in so many | |
3996 | ways, conditionally or not, the breakpoint code is kind of complex. Mostly, | |
3997 | we try to parse the command type, and then shuttle it off to an appropriate | |
3998 | subroutine to actually do the work of setting the breakpoint in the right | |
3999 | place. | |
4000 | ||
4001 | =cut | |
492652be | 4002 | |
d12a4851 | 4003 | sub cmd_b { |
e22ea7cc RF |
4004 | my $cmd = shift; |
4005 | my $line = shift; # [.|line] [cond] | |
4006 | my $dbline = shift; | |
69893cff RGS |
4007 | |
4008 | # Make . the current line number if it's there.. | |
4009 | $line =~ s/^\./$dbline/; | |
4010 | ||
e22ea7cc RF |
4011 | # No line number, no condition. Simple break on current line. |
4012 | if ( $line =~ /^\s*$/ ) { | |
4013 | &cmd_b_line( $dbline, 1 ); | |
4014 | } | |
69893cff RGS |
4015 | |
4016 | # Break on load for a file. | |
e22ea7cc RF |
4017 | elsif ( $line =~ /^load\b\s*(.*)/ ) { |
4018 | my $file = $1; | |
69893cff RGS |
4019 | $file =~ s/\s+$//; |
4020 | &cmd_b_load($file); | |
e22ea7cc | 4021 | } |
69893cff RGS |
4022 | |
4023 | # b compile|postpone <some sub> [<condition>] | |
e22ea7cc | 4024 | # The interpreter actually traps this one for us; we just put the |
69893cff | 4025 | # necessary condition in the %postponed hash. |
e22ea7cc RF |
4026 | elsif ( $line =~ /^(postpone|compile)\b\s*([':A-Za-z_][':\w]*)\s*(.*)/ ) { |
4027 | ||
69893cff RGS |
4028 | # Capture the condition if there is one. Make it true if none. |
4029 | my $cond = length $3 ? $3 : '1'; | |
4030 | ||
4031 | # Save the sub name and set $break to 1 if $1 was 'postpone', 0 | |
4032 | # if it was 'compile'. | |
e22ea7cc | 4033 | my ( $subname, $break ) = ( $2, $1 eq 'postpone' ); |
69893cff RGS |
4034 | |
4035 | # De-Perl4-ify the name - ' separators to ::. | |
4036 | $subname =~ s/\'/::/g; | |
4037 | ||
4038 | # Qualify it into the current package unless it's already qualified. | |
4039 | $subname = "${'package'}::" . $subname unless $subname =~ /::/; | |
4040 | ||
4041 | # Add main if it starts with ::. | |
e22ea7cc | 4042 | $subname = "main" . $subname if substr( $subname, 0, 2 ) eq "::"; |
69893cff RGS |
4043 | |
4044 | # Save the break type for this sub. | |
4045 | $postponed{$subname} = $break ? "break +0 if $cond" : "compile"; | |
4046 | } ## end elsif ($line =~ ... | |
4047 | ||
4048 | # b <sub name> [<condition>] | |
e22ea7cc RF |
4049 | elsif ( $line =~ /^([':A-Za-z_][':\w]*(?:\[.*\])?)\s*(.*)/ ) { |
4050 | ||
69893cff RGS |
4051 | # |
4052 | $subname = $1; | |
4053 | $cond = length $2 ? $2 : '1'; | |
e22ea7cc RF |
4054 | &cmd_b_sub( $subname, $cond ); |
4055 | } | |
69893cff RGS |
4056 | |
4057 | # b <line> [<condition>]. | |
e22ea7cc RF |
4058 | elsif ( $line =~ /^(\d*)\s*(.*)/ ) { |
4059 | ||
69893cff RGS |
4060 | # Capture the line. If none, it's the current line. |
4061 | $line = $1 || $dbline; | |
4062 | ||
4063 | # If there's no condition, make it '1'. | |
4064 | $cond = length $2 ? $2 : '1'; | |
4065 | ||
4066 | # Break on line. | |
e22ea7cc RF |
4067 | &cmd_b_line( $line, $cond ); |
4068 | } | |
69893cff RGS |
4069 | |
4070 | # Line didn't make sense. | |
4071 | else { | |
4072 | print "confused by line($line)?\n"; | |
4073 | } | |
4074 | } ## end sub cmd_b | |
4075 | ||
4076 | =head3 C<break_on_load> (API) | |
4077 | ||
4078 | We want to break when this file is loaded. Mark this file in the | |
4079 | C<%break_on_load> hash, and note that it has a breakpoint in | |
4080 | C<%had_breakpoints>. | |
4081 | ||
4082 | =cut | |
4083 | ||
d12a4851 | 4084 | sub break_on_load { |
e22ea7cc RF |
4085 | my $file = shift; |
4086 | $break_on_load{$file} = 1; | |
4087 | $had_breakpoints{$file} |= 1; | |
d12a4851 | 4088 | } |
f1583d8f | 4089 | |
69893cff RGS |
4090 | =head3 C<report_break_on_load> (API) |
4091 | ||
4092 | Gives us an array of filenames that are set to break on load. Note that | |
4093 | only files with break-on-load are in here, so simply showing the keys | |
4094 | suffices. | |
4095 | ||
4096 | =cut | |
4097 | ||
d12a4851 | 4098 | sub report_break_on_load { |
e22ea7cc | 4099 | sort keys %break_on_load; |
d12a4851 | 4100 | } |
f1583d8f | 4101 | |
69893cff RGS |
4102 | =head3 C<cmd_b_load> (command) |
4103 | ||
4104 | We take the file passed in and try to find it in C<%INC> (which maps modules | |
4105 | to files they came from). We mark those files for break-on-load via | |
4106 | C<break_on_load> and then report that it was done. | |
4107 | ||
4108 | =cut | |
4109 | ||
d12a4851 | 4110 | sub cmd_b_load { |
e22ea7cc RF |
4111 | my $file = shift; |
4112 | my @files; | |
69893cff RGS |
4113 | |
4114 | # This is a block because that way we can use a redo inside it | |
4115 | # even without there being any looping structure at all outside it. | |
e22ea7cc RF |
4116 | { |
4117 | ||
69893cff | 4118 | # Save short name and full path if found. |
e22ea7cc RF |
4119 | push @files, $file; |
4120 | push @files, $::INC{$file} if $::INC{$file}; | |
69893cff | 4121 | |
e22ea7cc | 4122 | # Tack on .pm and do it again unless there was a '.' in the name |
69893cff | 4123 | # already. |
e22ea7cc RF |
4124 | $file .= '.pm', redo unless $file =~ /\./; |
4125 | } | |
69893cff RGS |
4126 | |
4127 | # Do the real work here. | |
e22ea7cc | 4128 | break_on_load($_) for @files; |
69893cff RGS |
4129 | |
4130 | # All the files that have break-on-load breakpoints. | |
e22ea7cc | 4131 | @files = report_break_on_load; |
69893cff RGS |
4132 | |
4133 | # Normalize for the purposes of our printing this. | |
e22ea7cc RF |
4134 | local $\ = ''; |
4135 | local $" = ' '; | |
4136 | print $OUT "Will stop on load of `@files'.\n"; | |
4137 | } ## end sub cmd_b_load | |
f1583d8f | 4138 | |
69893cff RGS |
4139 | =head3 C<$filename_error> (API package global) |
4140 | ||
4141 | Several of the functions we need to implement in the API need to work both | |
4142 | on the current file and on other files. We don't want to duplicate code, so | |
4143 | C<$filename_error> is used to contain the name of the file that's being | |
4144 | worked on (if it's not the current one). | |
4145 | ||
4146 | We can now build functions in pairs: the basic function works on the current | |
4147 | file, and uses C<$filename_error> as part of its error message. Since this is | |
be9a9b1d | 4148 | initialized to C<"">, no filename will appear when we are working on the |
69893cff RGS |
4149 | current file. |
4150 | ||
4151 | The second function is a wrapper which does the following: | |
4152 | ||
4153 | =over 4 | |
4154 | ||
be9a9b1d AT |
4155 | =item * |
4156 | ||
4157 | Localizes C<$filename_error> and sets it to the name of the file to be processed. | |
4158 | ||
4159 | =item * | |
4160 | ||
4161 | Localizes the C<*dbline> glob and reassigns it to point to the file we want to process. | |
69893cff | 4162 | |
be9a9b1d | 4163 | =item * |
69893cff | 4164 | |
be9a9b1d | 4165 | Calls the first function. |
69893cff | 4166 | |
be9a9b1d | 4167 | The first function works on the I<current> file (i.e., the one we changed to), |
69893cff | 4168 | and prints C<$filename_error> in the error message (the name of the other file) |
be9a9b1d AT |
4169 | if it needs to. When the functions return, C<*dbline> is restored to point |
4170 | to the actual current file (the one we're executing in) and | |
4171 | C<$filename_error> is restored to C<"">. This restores everything to | |
4172 | the way it was before the second function was called at all. | |
69893cff RGS |
4173 | |
4174 | See the comments in C<breakable_line> and C<breakable_line_in_file> for more | |
4175 | details. | |
4176 | ||
4177 | =back | |
4178 | ||
4179 | =cut | |
4180 | ||
d12a4851 | 4181 | $filename_error = ''; |
f1583d8f | 4182 | |
be9a9b1d | 4183 | =head3 breakable_line(from, to) (API) |
69893cff RGS |
4184 | |
4185 | The subroutine decides whether or not a line in the current file is breakable. | |
4186 | It walks through C<@dbline> within the range of lines specified, looking for | |
4187 | the first line that is breakable. | |
4188 | ||
4189 | If C<$to> is greater than C<$from>, the search moves forwards, finding the | |
4190 | first line I<after> C<$to> that's breakable, if there is one. | |
4191 | ||
4192 | If C<$from> is greater than C<$to>, the search goes I<backwards>, finding the | |
4193 | first line I<before> C<$to> that's breakable, if there is one. | |
4194 | ||
4195 | =cut | |
4196 | ||
d12a4851 | 4197 | sub breakable_line { |
69893cff | 4198 | |
e22ea7cc | 4199 | my ( $from, $to ) = @_; |
69893cff RGS |
4200 | |
4201 | # $i is the start point. (Where are the FORTRAN programs of yesteryear?) | |
e22ea7cc | 4202 | my $i = $from; |
69893cff RGS |
4203 | |
4204 | # If there are at least 2 arguments, we're trying to search a range. | |
e22ea7cc | 4205 | if ( @_ >= 2 ) { |
69893cff RGS |
4206 | |
4207 | # $delta is positive for a forward search, negative for a backward one. | |
e22ea7cc | 4208 | my $delta = $from < $to ? +1 : -1; |
69893cff RGS |
4209 | |
4210 | # Keep us from running off the ends of the file. | |
e22ea7cc | 4211 | my $limit = $delta > 0 ? $#dbline : 1; |
69893cff RGS |
4212 | |
4213 | # Clever test. If you're a mathematician, it's obvious why this | |
4214 | # test works. If not: | |
4215 | # If $delta is positive (going forward), $limit will be $#dbline. | |
4216 | # If $to is less than $limit, ($limit - $to) will be positive, times | |
4217 | # $delta of 1 (positive), so the result is > 0 and we should use $to | |
e22ea7cc | 4218 | # as the stopping point. |
69893cff RGS |
4219 | # |
4220 | # If $to is greater than $limit, ($limit - $to) is negative, | |
e22ea7cc | 4221 | # times $delta of 1 (positive), so the result is < 0 and we should |
69893cff RGS |
4222 | # use $limit ($#dbline) as the stopping point. |
4223 | # | |
e22ea7cc | 4224 | # If $delta is negative (going backward), $limit will be 1. |
69893cff RGS |
4225 | # If $to is zero, ($limit - $to) will be 1, times $delta of -1 |
4226 | # (negative) so the result is > 0, and we use $to as the stopping | |
4227 | # point. | |
4228 | # | |
4229 | # If $to is less than zero, ($limit - $to) will be positive, | |
e22ea7cc RF |
4230 | # times $delta of -1 (negative), so the result is not > 0, and |
4231 | # we use $limit (1) as the stopping point. | |
69893cff RGS |
4232 | # |
4233 | # If $to is 1, ($limit - $to) will zero, times $delta of -1 | |
e22ea7cc | 4234 | # (negative), still giving zero; the result is not > 0, and |
69893cff RGS |
4235 | # we use $limit (1) as the stopping point. |
4236 | # | |
4237 | # if $to is >1, ($limit - $to) will be negative, times $delta of -1 | |
4238 | # (negative), giving a positive (>0) value, so we'll set $limit to | |
4239 | # $to. | |
e22ea7cc RF |
4240 | |
4241 | $limit = $to if ( $limit - $to ) * $delta > 0; | |
69893cff RGS |
4242 | |
4243 | # The real search loop. | |
4244 | # $i starts at $from (the point we want to start searching from). | |
4245 | # We move through @dbline in the appropriate direction (determined | |
e22ea7cc RF |
4246 | # by $delta: either -1 (back) or +1 (ahead). |
4247 | # We stay in as long as we haven't hit an executable line | |
69893cff RGS |
4248 | # ($dbline[$i] == 0 means not executable) and we haven't reached |
4249 | # the limit yet (test similar to the above). | |
e22ea7cc RF |
4250 | $i += $delta while $dbline[$i] == 0 and ( $limit - $i ) * $delta > 0; |
4251 | ||
69893cff RGS |
4252 | } ## end if (@_ >= 2) |
4253 | ||
4254 | # If $i points to a line that is executable, return that. | |
e22ea7cc | 4255 | return $i unless $dbline[$i] == 0; |
69893cff RGS |
4256 | |
4257 | # Format the message and print it: no breakable lines in range. | |
e22ea7cc RF |
4258 | my ( $pl, $upto ) = ( '', '' ); |
4259 | ( $pl, $upto ) = ( 's', "..$to" ) if @_ >= 2 and $from != $to; | |
69893cff RGS |
4260 | |
4261 | # If there's a filename in filename_error, we'll see it. | |
4262 | # If not, not. | |
e22ea7cc | 4263 | die "Line$pl $from$upto$filename_error not breakable\n"; |
69893cff RGS |
4264 | } ## end sub breakable_line |
4265 | ||
be9a9b1d | 4266 | =head3 breakable_line_in_filename(file, from, to) (API) |
69893cff RGS |
4267 | |
4268 | Like C<breakable_line>, but look in another file. | |
4269 | ||
4270 | =cut | |
f1583d8f | 4271 | |
d12a4851 | 4272 | sub breakable_line_in_filename { |
e22ea7cc | 4273 | |
69893cff | 4274 | # Capture the file name. |
e22ea7cc | 4275 | my ($f) = shift; |
69893cff RGS |
4276 | |
4277 | # Swap the magic line array over there temporarily. | |
e22ea7cc | 4278 | local *dbline = $main::{ '_<' . $f }; |
69893cff RGS |
4279 | |
4280 | # If there's an error, it's in this other file. | |
e22ea7cc | 4281 | local $filename_error = " of `$f'"; |
69893cff RGS |
4282 | |
4283 | # Find the breakable line. | |
e22ea7cc | 4284 | breakable_line(@_); |
69893cff RGS |
4285 | |
4286 | # *dbline and $filename_error get restored when this block ends. | |
4287 | ||
4288 | } ## end sub breakable_line_in_filename | |
4289 | ||
4290 | =head3 break_on_line(lineno, [condition]) (API) | |
4291 | ||
4292 | Adds a breakpoint with the specified condition (or 1 if no condition was | |
4293 | specified) to the specified line. Dies if it can't. | |
4294 | ||
4295 | =cut | |
f1583d8f | 4296 | |
d12a4851 | 4297 | sub break_on_line { |
e22ea7cc | 4298 | my ( $i, $cond ) = @_; |
69893cff RGS |
4299 | |
4300 | # Always true if no condition supplied. | |
e22ea7cc | 4301 | $cond = 1 unless @_ >= 2; |
69893cff | 4302 | |
e22ea7cc RF |
4303 | my $inii = $i; |
4304 | my $after = ''; | |
4305 | my $pl = ''; | |
69893cff RGS |
4306 | |
4307 | # Woops, not a breakable line. $filename_error allows us to say | |
4308 | # if it was in a different file. | |
e22ea7cc | 4309 | die "Line $i$filename_error not breakable.\n" if $dbline[$i] == 0; |
69893cff RGS |
4310 | |
4311 | # Mark this file as having breakpoints in it. | |
e22ea7cc RF |
4312 | $had_breakpoints{$filename} |= 1; |
4313 | ||
4314 | # If there is an action or condition here already ... | |
4315 | if ( $dbline{$i} ) { | |
69893cff | 4316 | |
69893cff | 4317 | # ... swap this condition for the existing one. |
e22ea7cc | 4318 | $dbline{$i} =~ s/^[^\0]*/$cond/; |
69893cff | 4319 | } |
e22ea7cc RF |
4320 | else { |
4321 | ||
69893cff | 4322 | # Nothing here - just add the condition. |
e22ea7cc | 4323 | $dbline{$i} = $cond; |
69893cff RGS |
4324 | } |
4325 | } ## end sub break_on_line | |
4326 | ||
4327 | =head3 cmd_b_line(line, [condition]) (command) | |
4328 | ||
4329 | Wrapper for C<break_on_line>. Prints the failure message if it | |
4330 | doesn't work. | |
4331 | ||
4332 | =cut | |
f1583d8f | 4333 | |
d12a4851 | 4334 | sub cmd_b_line { |
e22ea7cc RF |
4335 | eval { break_on_line(@_); 1 } or do { |
4336 | local $\ = ''; | |
4337 | print $OUT $@ and return; | |
4338 | }; | |
69893cff RGS |
4339 | } ## end sub cmd_b_line |
4340 | ||
4341 | =head3 break_on_filename_line(file, line, [condition]) (API) | |
4342 | ||
4343 | Switches to the file specified and then calls C<break_on_line> to set | |
4344 | the breakpoint. | |
4345 | ||
4346 | =cut | |
f1583d8f | 4347 | |
d12a4851 | 4348 | sub break_on_filename_line { |
e22ea7cc | 4349 | my ( $f, $i, $cond ) = @_; |
69893cff RGS |
4350 | |
4351 | # Always true if condition left off. | |
e22ea7cc | 4352 | $cond = 1 unless @_ >= 3; |
69893cff RGS |
4353 | |
4354 | # Switch the magical hash temporarily. | |
e22ea7cc | 4355 | local *dbline = $main::{ '_<' . $f }; |
69893cff RGS |
4356 | |
4357 | # Localize the variables that break_on_line uses to make its message. | |
e22ea7cc RF |
4358 | local $filename_error = " of `$f'"; |
4359 | local $filename = $f; | |
69893cff RGS |
4360 | |
4361 | # Add the breakpoint. | |
e22ea7cc | 4362 | break_on_line( $i, $cond ); |
69893cff RGS |
4363 | } ## end sub break_on_filename_line |
4364 | ||
4365 | =head3 break_on_filename_line_range(file, from, to, [condition]) (API) | |
4366 | ||
4367 | Switch to another file, search the range of lines specified for an | |
4368 | executable one, and put a breakpoint on the first one you find. | |
4369 | ||
4370 | =cut | |
f1583d8f | 4371 | |
d12a4851 | 4372 | sub break_on_filename_line_range { |
e22ea7cc | 4373 | my ( $f, $from, $to, $cond ) = @_; |
69893cff RGS |
4374 | |
4375 | # Find a breakable line if there is one. | |
e22ea7cc | 4376 | my $i = breakable_line_in_filename( $f, $from, $to ); |
69893cff | 4377 | |
e22ea7cc RF |
4378 | # Always true if missing. |
4379 | $cond = 1 unless @_ >= 3; | |
69893cff RGS |
4380 | |
4381 | # Add the breakpoint. | |
e22ea7cc | 4382 | break_on_filename_line( $f, $i, $cond ); |
69893cff RGS |
4383 | } ## end sub break_on_filename_line_range |
4384 | ||
4385 | =head3 subroutine_filename_lines(subname, [condition]) (API) | |
4386 | ||
4387 | Search for a subroutine within a given file. The condition is ignored. | |
4388 | Uses C<find_sub> to locate the desired subroutine. | |
4389 | ||
4390 | =cut | |
f1583d8f | 4391 | |
d12a4851 | 4392 | sub subroutine_filename_lines { |
e22ea7cc | 4393 | my ( $subname, $cond ) = @_; |
69893cff RGS |
4394 | |
4395 | # Returned value from find_sub() is fullpathname:startline-endline. | |
4396 | # The match creates the list (fullpathname, start, end). Falling off | |
4397 | # the end of the subroutine returns this implicitly. | |
e22ea7cc | 4398 | find_sub($subname) =~ /^(.*):(\d+)-(\d+)$/; |
69893cff RGS |
4399 | } ## end sub subroutine_filename_lines |
4400 | ||
4401 | =head3 break_subroutine(subname) (API) | |
4402 | ||
4403 | Places a break on the first line possible in the specified subroutine. Uses | |
4404 | C<subroutine_filename_lines> to find the subroutine, and | |
4405 | C<break_on_filename_line_range> to place the break. | |
4406 | ||
4407 | =cut | |
f1583d8f | 4408 | |
d12a4851 | 4409 | sub break_subroutine { |
e22ea7cc | 4410 | my $subname = shift; |
69893cff RGS |
4411 | |
4412 | # Get filename, start, and end. | |
e22ea7cc RF |
4413 | my ( $file, $s, $e ) = subroutine_filename_lines($subname) |
4414 | or die "Subroutine $subname not found.\n"; | |
69893cff RGS |
4415 | |
4416 | # Null condition changes to '1' (always true). | |
e22ea7cc | 4417 | $cond = 1 unless @_ >= 2; |
69893cff RGS |
4418 | |
4419 | # Put a break the first place possible in the range of lines | |
4420 | # that make up this subroutine. | |
e22ea7cc | 4421 | break_on_filename_line_range( $file, $s, $e, @_ ); |
69893cff RGS |
4422 | } ## end sub break_subroutine |
4423 | ||
4424 | =head3 cmd_b_sub(subname, [condition]) (command) | |
4425 | ||
4426 | We take the incoming subroutine name and fully-qualify it as best we can. | |
4427 | ||
4428 | =over 4 | |
4429 | ||
4430 | =item 1. If it's already fully-qualified, leave it alone. | |
4431 | ||
4432 | =item 2. Try putting it in the current package. | |
4433 | ||
4434 | =item 3. If it's not there, try putting it in CORE::GLOBAL if it exists there. | |
4435 | ||
4436 | =item 4. If it starts with '::', put it in 'main::'. | |
4437 | ||
4438 | =back | |
4439 | ||
4440 | After all this cleanup, we call C<break_subroutine> to try to set the | |
4441 | breakpoint. | |
4442 | ||
4443 | =cut | |
f1583d8f | 4444 | |
d12a4851 | 4445 | sub cmd_b_sub { |
e22ea7cc | 4446 | my ( $subname, $cond ) = @_; |
69893cff RGS |
4447 | |
4448 | # Add always-true condition if we have none. | |
e22ea7cc | 4449 | $cond = 1 unless @_ >= 2; |
69893cff | 4450 | |
e22ea7cc | 4451 | # If the subname isn't a code reference, qualify it so that |
69893cff | 4452 | # break_subroutine() will work right. |
e22ea7cc RF |
4453 | unless ( ref $subname eq 'CODE' ) { |
4454 | ||
69893cff | 4455 | # Not Perl4. |
e22ea7cc RF |
4456 | $subname =~ s/\'/::/g; |
4457 | my $s = $subname; | |
69893cff RGS |
4458 | |
4459 | # Put it in this package unless it's already qualified. | |
e22ea7cc RF |
4460 | $subname = "${'package'}::" . $subname |
4461 | unless $subname =~ /::/; | |
69893cff RGS |
4462 | |
4463 | # Requalify it into CORE::GLOBAL if qualifying it into this | |
4464 | # package resulted in its not being defined, but only do so | |
4465 | # if it really is in CORE::GLOBAL. | |
e22ea7cc RF |
4466 | $subname = "CORE::GLOBAL::$s" |
4467 | if not defined &$subname | |
4468 | and $s !~ /::/ | |
4469 | and defined &{"CORE::GLOBAL::$s"}; | |
69893cff RGS |
4470 | |
4471 | # Put it in package 'main' if it has a leading ::. | |
e22ea7cc | 4472 | $subname = "main" . $subname if substr( $subname, 0, 2 ) eq "::"; |
69893cff RGS |
4473 | |
4474 | } ## end unless (ref $subname eq 'CODE') | |
4475 | ||
4476 | # Try to set the breakpoint. | |
e22ea7cc RF |
4477 | eval { break_subroutine( $subname, $cond ); 1 } or do { |
4478 | local $\ = ''; | |
4479 | print $OUT $@ and return; | |
4480 | } | |
69893cff RGS |
4481 | } ## end sub cmd_b_sub |
4482 | ||
4483 | =head3 C<cmd_B> - delete breakpoint(s) (command) | |
4484 | ||
4485 | The command mostly parses the command line and tries to turn the argument | |
4486 | into a line spec. If it can't, it uses the current line. It then calls | |
4487 | C<delete_breakpoint> to actually do the work. | |
4488 | ||
4489 | If C<*> is specified, C<cmd_B> calls C<delete_breakpoint> with no arguments, | |
4490 | thereby deleting all the breakpoints. | |
4491 | ||
4492 | =cut | |
4493 | ||
4494 | sub cmd_B { | |
e22ea7cc | 4495 | my $cmd = shift; |
69893cff | 4496 | |
e22ea7cc | 4497 | # No line spec? Use dbline. |
69893cff | 4498 | # If there is one, use it if it's non-zero, or wipe it out if it is. |
e22ea7cc RF |
4499 | my $line = ( $_[0] =~ /^\./ ) ? $dbline : shift || ''; |
4500 | my $dbline = shift; | |
69893cff RGS |
4501 | |
4502 | # If the line was dot, make the line the current one. | |
4503 | $line =~ s/^\./$dbline/; | |
4504 | ||
4505 | # If it's * we're deleting all the breakpoints. | |
e22ea7cc | 4506 | if ( $line eq '*' ) { |
69893cff | 4507 | eval { &delete_breakpoint(); 1 } or print $OUT $@ and return; |
e22ea7cc | 4508 | } |
69893cff RGS |
4509 | |
4510 | # If there is a line spec, delete the breakpoint on that line. | |
e22ea7cc RF |
4511 | elsif ( $line =~ /^(\S.*)/ ) { |
4512 | eval { &delete_breakpoint( $line || $dbline ); 1 } or do { | |
4513 | local $\ = ''; | |
4514 | print $OUT $@ and return; | |
4515 | }; | |
69893cff RGS |
4516 | } ## end elsif ($line =~ /^(\S.*)/) |
4517 | ||
e22ea7cc | 4518 | # No line spec. |
69893cff | 4519 | else { |
e22ea7cc RF |
4520 | print $OUT |
4521 | "Deleting a breakpoint requires a line number, or '*' for all\n" | |
4522 | ; # hint | |
69893cff RGS |
4523 | } |
4524 | } ## end sub cmd_B | |
4525 | ||
4526 | =head3 delete_breakpoint([line]) (API) | |
f1583d8f | 4527 | |
69893cff RGS |
4528 | This actually does the work of deleting either a single breakpoint, or all |
4529 | of them. | |
4530 | ||
4531 | For a single line, we look for it in C<@dbline>. If it's nonbreakable, we | |
4532 | just drop out with a message saying so. If it is, we remove the condition | |
4533 | part of the 'condition\0action' that says there's a breakpoint here. If, | |
4534 | after we've done that, there's nothing left, we delete the corresponding | |
4535 | line in C<%dbline> to signal that no action needs to be taken for this line. | |
4536 | ||
4537 | For all breakpoints, we iterate through the keys of C<%had_breakpoints>, | |
4538 | which lists all currently-loaded files which have breakpoints. We then look | |
4539 | at each line in each of these files, temporarily switching the C<%dbline> | |
4540 | and C<@dbline> structures to point to the files in question, and do what | |
4541 | we did in the single line case: delete the condition in C<@dbline>, and | |
4542 | delete the key in C<%dbline> if nothing's left. | |
4543 | ||
4544 | We then wholesale delete C<%postponed>, C<%postponed_file>, and | |
4545 | C<%break_on_load>, because these structures contain breakpoints for files | |
4546 | and code that haven't been loaded yet. We can just kill these off because there | |
4547 | are no magical debugger structures associated with them. | |
4548 | ||
4549 | =cut | |
f1583d8f | 4550 | |
d12a4851 | 4551 | sub delete_breakpoint { |
e22ea7cc | 4552 | my $i = shift; |
69893cff RGS |
4553 | |
4554 | # If we got a line, delete just that one. | |
e22ea7cc | 4555 | if ( defined($i) ) { |
69893cff RGS |
4556 | |
4557 | # Woops. This line wasn't breakable at all. | |
e22ea7cc | 4558 | die "Line $i not breakable.\n" if $dbline[$i] == 0; |
69893cff RGS |
4559 | |
4560 | # Kill the condition, but leave any action. | |
e22ea7cc | 4561 | $dbline{$i} =~ s/^[^\0]*//; |
69893cff RGS |
4562 | |
4563 | # Remove the entry entirely if there's no action left. | |
e22ea7cc RF |
4564 | delete $dbline{$i} if $dbline{$i} eq ''; |
4565 | } | |
69893cff RGS |
4566 | |
4567 | # No line; delete them all. | |
e22ea7cc RF |
4568 | else { |
4569 | print $OUT "Deleting all breakpoints...\n"; | |
69893cff RGS |
4570 | |
4571 | # %had_breakpoints lists every file that had at least one | |
4572 | # breakpoint in it. | |
e22ea7cc RF |
4573 | for my $file ( keys %had_breakpoints ) { |
4574 | ||
69893cff | 4575 | # Switch to the desired file temporarily. |
e22ea7cc | 4576 | local *dbline = $main::{ '_<' . $file }; |
69893cff | 4577 | |
e22ea7cc RF |
4578 | my $max = $#dbline; |
4579 | my $was; | |
69893cff RGS |
4580 | |
4581 | # For all lines in this file ... | |
e22ea7cc RF |
4582 | for ( $i = 1 ; $i <= $max ; $i++ ) { |
4583 | ||
69893cff | 4584 | # If there's a breakpoint or action on this line ... |
e22ea7cc RF |
4585 | if ( defined $dbline{$i} ) { |
4586 | ||
69893cff | 4587 | # ... remove the breakpoint. |
e22ea7cc RF |
4588 | $dbline{$i} =~ s/^[^\0]+//; |
4589 | if ( $dbline{$i} =~ s/^\0?$// ) { | |
4590 | ||
69893cff | 4591 | # Remove the entry altogether if no action is there. |
e22ea7cc RF |
4592 | delete $dbline{$i}; |
4593 | } | |
69893cff RGS |
4594 | } ## end if (defined $dbline{$i... |
4595 | } ## end for ($i = 1 ; $i <= $max... | |
4596 | ||
4597 | # If, after we turn off the "there were breakpoints in this file" | |
e22ea7cc | 4598 | # bit, the entry in %had_breakpoints for this file is zero, |
69893cff | 4599 | # we should remove this file from the hash. |
e22ea7cc RF |
4600 | if ( not $had_breakpoints{$file} &= ~1 ) { |
4601 | delete $had_breakpoints{$file}; | |
4602 | } | |
69893cff RGS |
4603 | } ## end for my $file (keys %had_breakpoints) |
4604 | ||
4605 | # Kill off all the other breakpoints that are waiting for files that | |
4606 | # haven't been loaded yet. | |
e22ea7cc RF |
4607 | undef %postponed; |
4608 | undef %postponed_file; | |
4609 | undef %break_on_load; | |
69893cff RGS |
4610 | } ## end else [ if (defined($i)) |
4611 | } ## end sub delete_breakpoint | |
4612 | ||
4613 | =head3 cmd_stop (command) | |
4614 | ||
4615 | This is meant to be part of the new command API, but it isn't called or used | |
4616 | anywhere else in the debugger. XXX It is probably meant for use in development | |
4617 | of new commands. | |
4618 | ||
4619 | =cut | |
4620 | ||
4621 | sub cmd_stop { # As on ^C, but not signal-safy. | |
4622 | $signal = 1; | |
d12a4851 | 4623 | } |
f1583d8f | 4624 | |
2cbb2ee1 RGS |
4625 | =head3 C<cmd_e> - threads |
4626 | ||
4627 | Display the current thread id: | |
4628 | ||
4629 | e | |
4630 | ||
4631 | This could be how (when implemented) to send commands to this thread id (e cmd) | |
4632 | or that thread id (e tid cmd). | |
4633 | ||
4634 | =cut | |
4635 | ||
4636 | sub cmd_e { | |
4637 | my $cmd = shift; | |
4638 | my $line = shift; | |
4639 | unless (exists($INC{'threads.pm'})) { | |
4640 | print "threads not loaded($ENV{PERL5DB_THREADED}) | |
4641 | please run the debugger with PERL5DB_THREADED=1 set in the environment\n"; | |
4642 | } else { | |
878090d5 | 4643 | my $tid = threads->tid; |
2cbb2ee1 RGS |
4644 | print "thread id: $tid\n"; |
4645 | } | |
4646 | } ## end sub cmd_e | |
4647 | ||
4648 | =head3 C<cmd_E> - list of thread ids | |
4649 | ||
4650 | Display the list of available thread ids: | |
4651 | ||
4652 | E | |
4653 | ||
4654 | This could be used (when implemented) to send commands to all threads (E cmd). | |
4655 | ||
4656 | =cut | |
4657 | ||
4658 | sub cmd_E { | |
4659 | my $cmd = shift; | |
4660 | my $line = shift; | |
4661 | unless (exists($INC{'threads.pm'})) { | |
4662 | print "threads not loaded($ENV{PERL5DB_THREADED}) | |
4663 | please run the debugger with PERL5DB_THREADED=1 set in the environment\n"; | |
4664 | } else { | |
878090d5 | 4665 | my $tid = threads->tid; |
2cbb2ee1 RGS |
4666 | print "thread ids: ".join(', ', |
4667 | map { ($tid == $_->tid ? '<'.$_->tid.'>' : $_->tid) } threads->list | |
4668 | )."\n"; | |
4669 | } | |
4670 | } ## end sub cmd_E | |
4671 | ||
69893cff RGS |
4672 | =head3 C<cmd_h> - help command (command) |
4673 | ||
4674 | Does the work of either | |
4675 | ||
4676 | =over 4 | |
4677 | ||
be9a9b1d | 4678 | =item * |
69893cff | 4679 | |
be9a9b1d AT |
4680 | Showing all the debugger help |
4681 | ||
4682 | =item * | |
4683 | ||
4684 | Showing help for a specific command | |
69893cff RGS |
4685 | |
4686 | =back | |
4687 | ||
4688 | =cut | |
4689 | ||
d12a4851 | 4690 | sub cmd_h { |
e22ea7cc | 4691 | my $cmd = shift; |
69893cff RGS |
4692 | |
4693 | # If we have no operand, assume null. | |
e22ea7cc | 4694 | my $line = shift || ''; |
69893cff RGS |
4695 | |
4696 | # 'h h'. Print the long-format help. | |
e22ea7cc | 4697 | if ( $line =~ /^h\s*/ ) { |
69893cff | 4698 | print_help($help); |
e22ea7cc | 4699 | } |
69893cff RGS |
4700 | |
4701 | # 'h <something>'. Search for the command and print only its help. | |
e22ea7cc | 4702 | elsif ( $line =~ /^(\S.*)$/ ) { |
69893cff RGS |
4703 | |
4704 | # support long commands; otherwise bogus errors | |
4705 | # happen when you ask for h on <CR> for example | |
e22ea7cc RF |
4706 | my $asked = $1; # the command requested |
4707 | # (for proper error message) | |
69893cff | 4708 | |
e22ea7cc RF |
4709 | my $qasked = quotemeta($asked); # for searching; we don't |
4710 | # want to use it as a pattern. | |
4711 | # XXX: finds CR but not <CR> | |
69893cff RGS |
4712 | |
4713 | # Search the help string for the command. | |
e22ea7cc RF |
4714 | if ( |
4715 | $help =~ /^ # Start of a line | |
69893cff RGS |
4716 | <? # Optional '<' |
4717 | (?:[IB]<) # Optional markup | |
4718 | $qasked # The requested command | |
e22ea7cc RF |
4719 | /mx |
4720 | ) | |
4721 | { | |
4722 | ||
69893cff | 4723 | # It's there; pull it out and print it. |
e22ea7cc RF |
4724 | while ( |
4725 | $help =~ /^ | |
69893cff RGS |
4726 | (<? # Optional '<' |
4727 | (?:[IB]<) # Optional markup | |
4728 | $qasked # The command | |
4729 | ([\s\S]*?) # Description line(s) | |
4730 | \n) # End of last description line | |
4731 | (?!\s) # Next line not starting with | |
4732 | # whitespace | |
e22ea7cc RF |
4733 | /mgx |
4734 | ) | |
4735 | { | |
69893cff | 4736 | print_help($1); |
69893cff | 4737 | } |
e22ea7cc | 4738 | } |
69893cff RGS |
4739 | |
4740 | # Not found; not a debugger command. | |
e22ea7cc RF |
4741 | else { |
4742 | print_help("B<$asked> is not a debugger command.\n"); | |
4743 | } | |
69893cff RGS |
4744 | } ## end elsif ($line =~ /^(\S.*)$/) |
4745 | ||
4746 | # 'h' - print the summary help. | |
4747 | else { | |
e22ea7cc | 4748 | print_help($summary); |
69893cff RGS |
4749 | } |
4750 | } ## end sub cmd_h | |
492652be | 4751 | |
e219e2fb RF |
4752 | =head3 C<cmd_i> - inheritance display |
4753 | ||
4754 | Display the (nested) parentage of the module or object given. | |
4755 | ||
4756 | =cut | |
4757 | ||
4758 | sub cmd_i { | |
4759 | my $cmd = shift; | |
4760 | my $line = shift; | |
69893cff | 4761 | eval { require Class::ISA }; |
e22ea7cc RF |
4762 | if ($@) { |
4763 | &warn( $@ =~ /locate/ | |
4764 | ? "Class::ISA module not found - please install\n" | |
4765 | : $@ ); | |
4766 | } | |
4767 | else { | |
4768 | ISA: | |
4769 | foreach my $isa ( split( /\s+/, $line ) ) { | |
7fddc82f RF |
4770 | $evalarg = $isa; |
4771 | ($isa) = &eval; | |
e22ea7cc RF |
4772 | no strict 'refs'; |
4773 | print join( | |
4774 | ', ', | |
4775 | map { # snaffled unceremoniously from Class::ISA | |
4776 | "$_" | |
4777 | . ( | |
4778 | defined( ${"$_\::VERSION"} ) | |
4779 | ? ' ' . ${"$_\::VERSION"} | |
4780 | : undef ) | |
4781 | } Class::ISA::self_and_super_path(ref($isa) || $isa) | |
4782 | ); | |
4783 | print "\n"; | |
69893cff RGS |
4784 | } |
4785 | } | |
e219e2fb RF |
4786 | } ## end sub cmd_i |
4787 | ||
69893cff RGS |
4788 | =head3 C<cmd_l> - list lines (command) |
4789 | ||
4790 | Most of the command is taken up with transforming all the different line | |
4791 | specification syntaxes into 'start-stop'. After that is done, the command | |
4792 | runs a loop over C<@dbline> for the specified range of lines. It handles | |
4793 | the printing of each line and any markers (C<==E<gt>> for current line, | |
4794 | C<b> for break on this line, C<a> for action on this line, C<:> for this | |
4795 | line breakable). | |
4796 | ||
4797 | We save the last line listed in the C<$start> global for further listing | |
4798 | later. | |
4799 | ||
4800 | =cut | |
4801 | ||
d12a4851 | 4802 | sub cmd_l { |
69893cff | 4803 | my $current_line = $line; |
e22ea7cc | 4804 | my $cmd = shift; |
69893cff RGS |
4805 | my $line = shift; |
4806 | ||
4807 | # If this is '-something', delete any spaces after the dash. | |
4808 | $line =~ s/^-\s*$/-/; | |
4809 | ||
e22ea7cc | 4810 | # If the line is '$something', assume this is a scalar containing a |
69893cff | 4811 | # line number. |
e22ea7cc | 4812 | if ( $line =~ /^(\$.*)/s ) { |
69893cff RGS |
4813 | |
4814 | # Set up for DB::eval() - evaluate in *user* context. | |
4815 | $evalarg = $1; | |
e22ea7cc | 4816 | # $evalarg = $2; |
69893cff RGS |
4817 | my ($s) = &eval; |
4818 | ||
4819 | # Ooops. Bad scalar. | |
e22ea7cc | 4820 | print( $OUT "Error: $@\n" ), next CMD if $@; |
69893cff RGS |
4821 | |
4822 | # Good scalar. If it's a reference, find what it points to. | |
4823 | $s = CvGV_name($s); | |
e22ea7cc | 4824 | print( $OUT "Interpreted as: $1 $s\n" ); |
69893cff RGS |
4825 | $line = "$1 $s"; |
4826 | ||
4827 | # Call self recursively to really do the command. | |
e22ea7cc | 4828 | &cmd_l( 'l', $s ); |
69893cff RGS |
4829 | } ## end if ($line =~ /^(\$.*)/s) |
4830 | ||
e22ea7cc RF |
4831 | # l name. Try to find a sub by that name. |
4832 | elsif ( $line =~ /^([\':A-Za-z_][\':\w]*(\[.*\])?)/s ) { | |
69893cff RGS |
4833 | my $s = $subname = $1; |
4834 | ||
4835 | # De-Perl4. | |
4836 | $subname =~ s/\'/::/; | |
4837 | ||
4838 | # Put it in this package unless it starts with ::. | |
e22ea7cc | 4839 | $subname = $package . "::" . $subname unless $subname =~ /::/; |
69893cff RGS |
4840 | |
4841 | # Put it in CORE::GLOBAL if t doesn't start with :: and | |
4842 | # it doesn't live in this package and it lives in CORE::GLOBAL. | |
4843 | $subname = "CORE::GLOBAL::$s" | |
e22ea7cc RF |
4844 | if not defined &$subname |
4845 | and $s !~ /::/ | |
4846 | and defined &{"CORE::GLOBAL::$s"}; | |
69893cff RGS |
4847 | |
4848 | # Put leading '::' names into 'main::'. | |
e22ea7cc | 4849 | $subname = "main" . $subname if substr( $subname, 0, 2 ) eq "::"; |
69893cff | 4850 | |
e22ea7cc | 4851 | # Get name:start-stop from find_sub, and break this up at |
69893cff | 4852 | # colons. |
e22ea7cc | 4853 | @pieces = split( /:/, find_sub($subname) || $sub{$subname} ); |
69893cff RGS |
4854 | |
4855 | # Pull off start-stop. | |
4856 | $subrange = pop @pieces; | |
4857 | ||
4858 | # If the name contained colons, the split broke it up. | |
4859 | # Put it back together. | |
e22ea7cc | 4860 | $file = join( ':', @pieces ); |
69893cff RGS |
4861 | |
4862 | # If we're not in that file, switch over to it. | |
e22ea7cc | 4863 | if ( $file ne $filename ) { |
69893cff | 4864 | print $OUT "Switching to file '$file'.\n" |
e22ea7cc | 4865 | unless $slave_editor; |
69893cff RGS |
4866 | |
4867 | # Switch debugger's magic structures. | |
e22ea7cc RF |
4868 | *dbline = $main::{ '_<' . $file }; |
4869 | $max = $#dbline; | |
69893cff RGS |
4870 | $filename = $file; |
4871 | } ## end if ($file ne $filename) | |
4872 | ||
4873 | # Subrange is 'start-stop'. If this is less than a window full, | |
4874 | # swap it to 'start+', which will list a window from the start point. | |
4875 | if ($subrange) { | |
e22ea7cc RF |
4876 | if ( eval($subrange) < -$window ) { |
4877 | $subrange =~ s/-.*/+/; | |
69893cff | 4878 | } |
e22ea7cc | 4879 | |
69893cff RGS |
4880 | # Call self recursively to list the range. |
4881 | $line = $subrange; | |
e22ea7cc | 4882 | &cmd_l( 'l', $subrange ); |
69893cff RGS |
4883 | } ## end if ($subrange) |
4884 | ||
4885 | # Couldn't find it. | |
4886 | else { | |
4887 | print $OUT "Subroutine $subname not found.\n"; | |
4888 | } | |
4889 | } ## end elsif ($line =~ /^([\':A-Za-z_][\':\w]*(\[.*\])?)/s) | |
4890 | ||
4891 | # Bare 'l' command. | |
e22ea7cc RF |
4892 | elsif ( $line =~ /^\s*$/ ) { |
4893 | ||
69893cff RGS |
4894 | # Compute new range to list. |
4895 | $incr = $window - 1; | |
e22ea7cc RF |
4896 | $line = $start . '-' . ( $start + $incr ); |
4897 | ||
69893cff | 4898 | # Recurse to do it. |
e22ea7cc RF |
4899 | &cmd_l( 'l', $line ); |
4900 | } | |
69893cff RGS |
4901 | |
4902 | # l [start]+number_of_lines | |
e22ea7cc RF |
4903 | elsif ( $line =~ /^(\d*)\+(\d*)$/ ) { |
4904 | ||
69893cff RGS |
4905 | # Don't reset start for 'l +nnn'. |
4906 | $start = $1 if $1; | |
4907 | ||
4908 | # Increment for list. Use window size if not specified. | |
4909 | # (Allows 'l +' to work.) | |
4910 | $incr = $2; | |
4911 | $incr = $window - 1 unless $incr; | |
4912 | ||
4913 | # Create a line range we'll understand, and recurse to do it. | |
e22ea7cc RF |
4914 | $line = $start . '-' . ( $start + $incr ); |
4915 | &cmd_l( 'l', $line ); | |
69893cff RGS |
4916 | } ## end elsif ($line =~ /^(\d*)\+(\d*)$/) |
4917 | ||
4918 | # l start-stop or l start,stop | |
e22ea7cc | 4919 | elsif ( $line =~ /^((-?[\d\$\.]+)([-,]([\d\$\.]+))?)?/ ) { |
69893cff RGS |
4920 | |
4921 | # Determine end point; use end of file if not specified. | |
e22ea7cc | 4922 | $end = ( !defined $2 ) ? $max : ( $4 ? $4 : $2 ); |
69893cff RGS |
4923 | |
4924 | # Go on to the end, and then stop. | |
4925 | $end = $max if $end > $max; | |
4926 | ||
e22ea7cc RF |
4927 | # Determine start line. |
4928 | $i = $2; | |
4929 | $i = $line if $i eq '.'; | |
4930 | $i = 1 if $i < 1; | |
69893cff RGS |
4931 | $incr = $end - $i; |
4932 | ||
4933 | # If we're running under a slave editor, force it to show the lines. | |
4934 | if ($slave_editor) { | |
4935 | print $OUT "\032\032$filename:$i:0\n"; | |
4936 | $i = $end; | |
e22ea7cc | 4937 | } |
69893cff RGS |
4938 | |
4939 | # We're doing it ourselves. We want to show the line and special | |
4940 | # markers for: | |
e22ea7cc | 4941 | # - the current line in execution |
69893cff RGS |
4942 | # - whether a line is breakable or not |
4943 | # - whether a line has a break or not | |
4944 | # - whether a line has an action or not | |
4945 | else { | |
e22ea7cc RF |
4946 | for ( ; $i <= $end ; $i++ ) { |
4947 | ||
69893cff | 4948 | # Check for breakpoints and actions. |
e22ea7cc RF |
4949 | my ( $stop, $action ); |
4950 | ( $stop, $action ) = split( /\0/, $dbline{$i} ) | |
4951 | if $dbline{$i}; | |
69893cff RGS |
4952 | |
4953 | # ==> if this is the current line in execution, | |
4954 | # : if it's breakable. | |
e22ea7cc RF |
4955 | $arrow = |
4956 | ( $i == $current_line and $filename eq $filename_ini ) | |
4957 | ? '==>' | |
4958 | : ( $dbline[$i] + 0 ? ':' : ' ' ); | |
69893cff RGS |
4959 | |
4960 | # Add break and action indicators. | |
4961 | $arrow .= 'b' if $stop; | |
4962 | $arrow .= 'a' if $action; | |
4963 | ||
4964 | # Print the line. | |
4965 | print $OUT "$i$arrow\t", $dbline[$i]; | |
4966 | ||
4967 | # Move on to the next line. Drop out on an interrupt. | |
4968 | $i++, last if $signal; | |
4969 | } ## end for (; $i <= $end ; $i++) | |
4970 | ||
4971 | # Line the prompt up; print a newline if the last line listed | |
4972 | # didn't have a newline. | |
e22ea7cc | 4973 | print $OUT "\n" unless $dbline[ $i - 1 ] =~ /\n$/; |
69893cff RGS |
4974 | } ## end else [ if ($slave_editor) |
4975 | ||
4976 | # Save the point we last listed to in case another relative 'l' | |
4977 | # command is desired. Don't let it run off the end. | |
4978 | $start = $i; | |
4979 | $start = $max if $start > $max; | |
4980 | } ## end elsif ($line =~ /^((-?[\d\$\.]+)([-,]([\d\$\.]+))?)?/) | |
4981 | } ## end sub cmd_l | |
4982 | ||
4983 | =head3 C<cmd_L> - list breakpoints, actions, and watch expressions (command) | |
4984 | ||
4985 | To list breakpoints, the command has to look determine where all of them are | |
4986 | first. It starts a C<%had_breakpoints>, which tells us what all files have | |
4987 | breakpoints and/or actions. For each file, we switch the C<*dbline> glob (the | |
4988 | magic source and breakpoint data structures) to the file, and then look | |
4989 | through C<%dbline> for lines with breakpoints and/or actions, listing them | |
4990 | out. We look through C<%postponed> not-yet-compiled subroutines that have | |
4991 | breakpoints, and through C<%postponed_file> for not-yet-C<require>'d files | |
4992 | that have breakpoints. | |
4993 | ||
4994 | Watchpoints are simpler: we just list the entries in C<@to_watch>. | |
4995 | ||
4996 | =cut | |
492652be | 4997 | |
d12a4851 | 4998 | sub cmd_L { |
e22ea7cc | 4999 | my $cmd = shift; |
69893cff | 5000 | |
e22ea7cc | 5001 | # If no argument, list everything. Pre-5.8.0 version always lists |
69893cff | 5002 | # everything |
e22ea7cc RF |
5003 | my $arg = shift || 'abw'; |
5004 | $arg = 'abw' unless $CommandSet eq '580'; # sigh... | |
69893cff RGS |
5005 | |
5006 | # See what is wanted. | |
e22ea7cc RF |
5007 | my $action_wanted = ( $arg =~ /a/ ) ? 1 : 0; |
5008 | my $break_wanted = ( $arg =~ /b/ ) ? 1 : 0; | |
5009 | my $watch_wanted = ( $arg =~ /w/ ) ? 1 : 0; | |
69893cff RGS |
5010 | |
5011 | # Breaks and actions are found together, so we look in the same place | |
5012 | # for both. | |
e22ea7cc RF |
5013 | if ( $break_wanted or $action_wanted ) { |
5014 | ||
69893cff | 5015 | # Look in all the files with breakpoints... |
e22ea7cc RF |
5016 | for my $file ( keys %had_breakpoints ) { |
5017 | ||
69893cff RGS |
5018 | # Temporary switch to this file. |
5019 | local *dbline = $main::{ '_<' . $file }; | |
5020 | ||
5021 | # Set up to look through the whole file. | |
5022 | my $max = $#dbline; | |
e22ea7cc RF |
5023 | my $was; # Flag: did we print something |
5024 | # in this file? | |
69893cff RGS |
5025 | |
5026 | # For each line in the file ... | |
e22ea7cc RF |
5027 | for ( $i = 1 ; $i <= $max ; $i++ ) { |
5028 | ||
69893cff | 5029 | # We've got something on this line. |
e22ea7cc RF |
5030 | if ( defined $dbline{$i} ) { |
5031 | ||
69893cff RGS |
5032 | # Print the header if we haven't. |
5033 | print $OUT "$file:\n" unless $was++; | |
5034 | ||
5035 | # Print the line. | |
5036 | print $OUT " $i:\t", $dbline[$i]; | |
5037 | ||
5038 | # Pull out the condition and the action. | |
e22ea7cc | 5039 | ( $stop, $action ) = split( /\0/, $dbline{$i} ); |
69893cff RGS |
5040 | |
5041 | # Print the break if there is one and it's wanted. | |
5042 | print $OUT " break if (", $stop, ")\n" | |
e22ea7cc RF |
5043 | if $stop |
5044 | and $break_wanted; | |
69893cff RGS |
5045 | |
5046 | # Print the action if there is one and it's wanted. | |
5047 | print $OUT " action: ", $action, "\n" | |
e22ea7cc RF |
5048 | if $action |
5049 | and $action_wanted; | |
69893cff RGS |
5050 | |
5051 | # Quit if the user hit interrupt. | |
5052 | last if $signal; | |
5053 | } ## end if (defined $dbline{$i... | |
5054 | } ## end for ($i = 1 ; $i <= $max... | |
5055 | } ## end for my $file (keys %had_breakpoints) | |
5056 | } ## end if ($break_wanted or $action_wanted) | |
5057 | ||
5058 | # Look for breaks in not-yet-compiled subs: | |
e22ea7cc | 5059 | if ( %postponed and $break_wanted ) { |
69893cff RGS |
5060 | print $OUT "Postponed breakpoints in subroutines:\n"; |
5061 | my $subname; | |
e22ea7cc RF |
5062 | for $subname ( keys %postponed ) { |
5063 | print $OUT " $subname\t$postponed{$subname}\n"; | |
5064 | last if $signal; | |
69893cff RGS |
5065 | } |
5066 | } ## end if (%postponed and $break_wanted) | |
5067 | ||
5068 | # Find files that have not-yet-loaded breaks: | |
e22ea7cc RF |
5069 | my @have = map { # Combined keys |
5070 | keys %{ $postponed_file{$_} } | |
69893cff RGS |
5071 | } keys %postponed_file; |
5072 | ||
5073 | # If there are any, list them. | |
e22ea7cc | 5074 | if ( @have and ( $break_wanted or $action_wanted ) ) { |
69893cff | 5075 | print $OUT "Postponed breakpoints in files:\n"; |
e22ea7cc RF |
5076 | my ( $file, $line ); |
5077 | ||
5078 | for $file ( keys %postponed_file ) { | |
5079 | my $db = $postponed_file{$file}; | |
5080 | print $OUT " $file:\n"; | |
5081 | for $line ( sort { $a <=> $b } keys %$db ) { | |
5082 | print $OUT " $line:\n"; | |
5083 | my ( $stop, $action ) = split( /\0/, $$db{$line} ); | |
5084 | print $OUT " break if (", $stop, ")\n" | |
5085 | if $stop | |
5086 | and $break_wanted; | |
5087 | print $OUT " action: ", $action, "\n" | |
5088 | if $action | |
5089 | and $action_wanted; | |
5090 | last if $signal; | |
5091 | } ## end for $line (sort { $a <=>... | |
69893cff | 5092 | last if $signal; |
69893cff RGS |
5093 | } ## end for $file (keys %postponed_file) |
5094 | } ## end if (@have and ($break_wanted... | |
e22ea7cc | 5095 | if ( %break_on_load and $break_wanted ) { |
69893cff RGS |
5096 | print $OUT "Breakpoints on load:\n"; |
5097 | my $file; | |
e22ea7cc RF |
5098 | for $file ( keys %break_on_load ) { |
5099 | print $OUT " $file\n"; | |
69893cff RGS |
5100 | last if $signal; |
5101 | } | |
e22ea7cc RF |
5102 | } ## end if (%break_on_load and... |
5103 | if ($watch_wanted) { | |
5104 | if ( $trace & 2 ) { | |
5105 | print $OUT "Watch-expressions:\n" if @to_watch; | |
5106 | for my $expr (@to_watch) { | |
5107 | print $OUT " $expr\n"; | |
5108 | last if $signal; | |
5109 | } | |
69893cff RGS |
5110 | } ## end if ($trace & 2) |
5111 | } ## end if ($watch_wanted) | |
5112 | } ## end sub cmd_L | |
5113 | ||
5114 | =head3 C<cmd_M> - list modules (command) | |
5115 | ||
5116 | Just call C<list_modules>. | |
5117 | ||
5118 | =cut | |
492652be | 5119 | |
d12a4851 | 5120 | sub cmd_M { |
69893cff | 5121 | &list_modules(); |
d12a4851 | 5122 | } |
eda6e075 | 5123 | |
69893cff RGS |
5124 | =head3 C<cmd_o> - options (command) |
5125 | ||
5126 | If this is just C<o> by itself, we list the current settings via | |
5127 | C<dump_option>. If there's a nonblank value following it, we pass that on to | |
5128 | C<parse_options> for processing. | |
5129 | ||
5130 | =cut | |
5131 | ||
d12a4851 | 5132 | sub cmd_o { |
e22ea7cc RF |
5133 | my $cmd = shift; |
5134 | my $opt = shift || ''; # opt[=val] | |
69893cff RGS |
5135 | |
5136 | # Nonblank. Try to parse and process. | |
e22ea7cc | 5137 | if ( $opt =~ /^(\S.*)/ ) { |
69893cff | 5138 | &parse_options($1); |
e22ea7cc | 5139 | } |
69893cff RGS |
5140 | |
5141 | # Blank. List the current option settings. | |
5142 | else { | |
5143 | for (@options) { | |
5144 | &dump_option($_); | |
5145 | } | |
5146 | } | |
5147 | } ## end sub cmd_o | |
5148 | ||
5149 | =head3 C<cmd_O> - nonexistent in 5.8.x (command) | |
5150 | ||
5151 | Advises the user that the O command has been renamed. | |
5152 | ||
5153 | =cut | |
eda6e075 | 5154 | |
d12a4851 | 5155 | sub cmd_O { |
e22ea7cc RF |
5156 | print $OUT "The old O command is now the o command.\n"; # hint |
5157 | print $OUT "Use 'h' to get current command help synopsis or\n"; # | |
5158 | print $OUT "use 'o CommandSet=pre580' to revert to old usage\n"; # | |
d12a4851 | 5159 | } |
eda6e075 | 5160 | |
69893cff RGS |
5161 | =head3 C<cmd_v> - view window (command) |
5162 | ||
5163 | Uses the C<$preview> variable set in the second C<BEGIN> block (q.v.) to | |
5164 | move back a few lines to list the selected line in context. Uses C<cmd_l> | |
5165 | to do the actual listing after figuring out the range of line to request. | |
5166 | ||
5167 | =cut | |
5168 | ||
d12a4851 | 5169 | sub cmd_v { |
e22ea7cc | 5170 | my $cmd = shift; |
69893cff RGS |
5171 | my $line = shift; |
5172 | ||
5173 | # Extract the line to list around. (Astute readers will have noted that | |
5174 | # this pattern will match whether or not a numeric line is specified, | |
5175 | # which means that we'll always enter this loop (though a non-numeric | |
5176 | # argument results in no action at all)). | |
e22ea7cc RF |
5177 | if ( $line =~ /^(\d*)$/ ) { |
5178 | ||
69893cff RGS |
5179 | # Total number of lines to list (a windowful). |
5180 | $incr = $window - 1; | |
5181 | ||
5182 | # Set the start to the argument given (if there was one). | |
5183 | $start = $1 if $1; | |
5184 | ||
5185 | # Back up by the context amount. | |
5186 | $start -= $preview; | |
5187 | ||
5188 | # Put together a linespec that cmd_l will like. | |
e22ea7cc | 5189 | $line = $start . '-' . ( $start + $incr ); |
69893cff RGS |
5190 | |
5191 | # List the lines. | |
e22ea7cc | 5192 | &cmd_l( 'l', $line ); |
69893cff RGS |
5193 | } ## end if ($line =~ /^(\d*)$/) |
5194 | } ## end sub cmd_v | |
5195 | ||
5196 | =head3 C<cmd_w> - add a watch expression (command) | |
5197 | ||
5198 | The 5.8 version of this command adds a watch expression if one is specified; | |
5199 | it does nothing if entered with no operands. | |
5200 | ||
5201 | We extract the expression, save it, evaluate it in the user's context, and | |
5202 | save the value. We'll re-evaluate it each time the debugger passes a line, | |
5203 | and will stop (see the code at the top of the command loop) if the value | |
5204 | of any of the expressions changes. | |
5205 | ||
5206 | =cut | |
eda6e075 | 5207 | |
d12a4851 | 5208 | sub cmd_w { |
e22ea7cc | 5209 | my $cmd = shift; |
69893cff RGS |
5210 | |
5211 | # Null expression if no arguments. | |
5212 | my $expr = shift || ''; | |
5213 | ||
5214 | # If expression is not null ... | |
e22ea7cc RF |
5215 | if ( $expr =~ /^(\S.*)/ ) { |
5216 | ||
69893cff RGS |
5217 | # ... save it. |
5218 | push @to_watch, $expr; | |
5219 | ||
5220 | # Parameterize DB::eval and call it to get the expression's value | |
5221 | # in the user's context. This version can handle expressions which | |
5222 | # return a list value. | |
5223 | $evalarg = $expr; | |
e22ea7cc RF |
5224 | my ($val) = join( ' ', &eval ); |
5225 | $val = ( defined $val ) ? "'$val'" : 'undef'; | |
69893cff RGS |
5226 | |
5227 | # Save the current value of the expression. | |
5228 | push @old_watch, $val; | |
5229 | ||
5230 | # We are now watching expressions. | |
5231 | $trace |= 2; | |
5232 | } ## end if ($expr =~ /^(\S.*)/) | |
5233 | ||
5234 | # You have to give one to get one. | |
5235 | else { | |
e22ea7cc | 5236 | print $OUT "Adding a watch-expression requires an expression\n"; # hint |
69893cff RGS |
5237 | } |
5238 | } ## end sub cmd_w | |
5239 | ||
5240 | =head3 C<cmd_W> - delete watch expressions (command) | |
5241 | ||
5242 | This command accepts either a watch expression to be removed from the list | |
5243 | of watch expressions, or C<*> to delete them all. | |
5244 | ||
5245 | If C<*> is specified, we simply empty the watch expression list and the | |
5246 | watch expression value list. We also turn off the bit that says we've got | |
5247 | watch expressions. | |
5248 | ||
5249 | If an expression (or partial expression) is specified, we pattern-match | |
5250 | through the expressions and remove the ones that match. We also discard | |
5251 | the corresponding values. If no watch expressions are left, we turn off | |
be9a9b1d | 5252 | the I<watching expressions> bit. |
69893cff RGS |
5253 | |
5254 | =cut | |
eda6e075 | 5255 | |
d12a4851 | 5256 | sub cmd_W { |
69893cff RGS |
5257 | my $cmd = shift; |
5258 | my $expr = shift || ''; | |
5259 | ||
5260 | # Delete them all. | |
e22ea7cc RF |
5261 | if ( $expr eq '*' ) { |
5262 | ||
69893cff RGS |
5263 | # Not watching now. |
5264 | $trace &= ~2; | |
5265 | ||
5266 | print $OUT "Deleting all watch expressions ...\n"; | |
eda6e075 | 5267 | |
69893cff RGS |
5268 | # And all gone. |
5269 | @to_watch = @old_watch = (); | |
e22ea7cc | 5270 | } |
69893cff RGS |
5271 | |
5272 | # Delete one of them. | |
e22ea7cc RF |
5273 | elsif ( $expr =~ /^(\S.*)/ ) { |
5274 | ||
69893cff RGS |
5275 | # Where we are in the list. |
5276 | my $i_cnt = 0; | |
5277 | ||
5278 | # For each expression ... | |
5279 | foreach (@to_watch) { | |
5280 | my $val = $to_watch[$i_cnt]; | |
5281 | ||
5282 | # Does this one match the command argument? | |
e22ea7cc RF |
5283 | if ( $val eq $expr ) { # =~ m/^\Q$i$/) { |
5284 | # Yes. Turn it off, and its value too. | |
5285 | splice( @to_watch, $i_cnt, 1 ); | |
5286 | splice( @old_watch, $i_cnt, 1 ); | |
69893cff RGS |
5287 | } |
5288 | $i_cnt++; | |
5289 | } ## end foreach (@to_watch) | |
5290 | ||
5291 | # We don't bother to turn watching off because | |
5292 | # a) we don't want to stop calling watchfunction() it it exists | |
5293 | # b) foreach over a null list doesn't do anything anyway | |
5294 | ||
5295 | } ## end elsif ($expr =~ /^(\S.*)/) | |
5296 | ||
e22ea7cc | 5297 | # No command arguments entered. |
69893cff | 5298 | else { |
e22ea7cc RF |
5299 | print $OUT |
5300 | "Deleting a watch-expression requires an expression, or '*' for all\n" | |
5301 | ; # hint | |
69893cff RGS |
5302 | } |
5303 | } ## end sub cmd_W | |
5304 | ||
5305 | ### END of the API section | |
5306 | ||
5307 | =head1 SUPPORT ROUTINES | |
eda6e075 | 5308 | |
69893cff RGS |
5309 | These are general support routines that are used in a number of places |
5310 | throughout the debugger. | |
5311 | ||
69893cff RGS |
5312 | =head2 save |
5313 | ||
5314 | save() saves the user's versions of globals that would mess us up in C<@saved>, | |
5315 | and installs the versions we like better. | |
5316 | ||
5317 | =cut | |
3a6edaec | 5318 | |
d12a4851 | 5319 | sub save { |
e22ea7cc RF |
5320 | |
5321 | # Save eval failure, command failure, extended OS error, output field | |
5322 | # separator, input record separator, output record separator and | |
69893cff | 5323 | # the warning setting. |
e22ea7cc | 5324 | @saved = ( $@, $!, $^E, $,, $/, $\, $^W ); |
69893cff | 5325 | |
e22ea7cc RF |
5326 | $, = ""; # output field separator is null string |
5327 | $/ = "\n"; # input record separator is newline | |
5328 | $\ = ""; # output record separator is null string | |
5329 | $^W = 0; # warnings are off | |
69893cff RGS |
5330 | } ## end sub save |
5331 | ||
5332 | =head2 C<print_lineinfo> - show where we are now | |
5333 | ||
5334 | print_lineinfo prints whatever it is that it is handed; it prints it to the | |
5335 | C<$LINEINFO> filehandle instead of just printing it to STDOUT. This allows | |
5336 | us to feed line information to a slave editor without messing up the | |
5337 | debugger output. | |
5338 | ||
5339 | =cut | |
eda6e075 | 5340 | |
d12a4851 | 5341 | sub print_lineinfo { |
e22ea7cc | 5342 | |
69893cff | 5343 | # Make the terminal sensible if we're not the primary debugger. |
e22ea7cc RF |
5344 | resetterm(1) if $LINEINFO eq $OUT and $term_pid != $$; |
5345 | local $\ = ''; | |
5346 | local $, = ''; | |
5347 | print $LINEINFO @_; | |
69893cff RGS |
5348 | } ## end sub print_lineinfo |
5349 | ||
5350 | =head2 C<postponed_sub> | |
5351 | ||
5352 | Handles setting postponed breakpoints in subroutines once they're compiled. | |
5353 | For breakpoints, we use C<DB::find_sub> to locate the source file and line | |
5354 | range for the subroutine, then mark the file as having a breakpoint, | |
5355 | temporarily switch the C<*dbline> glob over to the source file, and then | |
5356 | search the given range of lines to find a breakable line. If we find one, | |
5357 | we set the breakpoint on it, deleting the breakpoint from C<%postponed>. | |
5358 | ||
5359 | =cut | |
eda6e075 | 5360 | |
d12a4851 | 5361 | # The following takes its argument via $evalarg to preserve current @_ |
eda6e075 | 5362 | |
d12a4851 | 5363 | sub postponed_sub { |
e22ea7cc | 5364 | |
69893cff | 5365 | # Get the subroutine name. |
e22ea7cc | 5366 | my $subname = shift; |
69893cff RGS |
5367 | |
5368 | # If this is a 'break +<n> if <condition>' ... | |
e22ea7cc RF |
5369 | if ( $postponed{$subname} =~ s/^break\s([+-]?\d+)\s+if\s// ) { |
5370 | ||
69893cff | 5371 | # If there's no offset, use '+0'. |
e22ea7cc | 5372 | my $offset = $1 || 0; |
69893cff RGS |
5373 | |
5374 | # find_sub's value is 'fullpath-filename:start-stop'. It's | |
5375 | # possible that the filename might have colons in it too. | |
e22ea7cc RF |
5376 | my ( $file, $i ) = ( find_sub($subname) =~ /^(.*):(\d+)-.*$/ ); |
5377 | if ($i) { | |
5378 | ||
5379 | # We got the start line. Add the offset '+<n>' from | |
69893cff | 5380 | # $postponed{subname}. |
e22ea7cc | 5381 | $i += $offset; |
69893cff RGS |
5382 | |
5383 | # Switch to the file this sub is in, temporarily. | |
e22ea7cc | 5384 | local *dbline = $main::{ '_<' . $file }; |
69893cff RGS |
5385 | |
5386 | # No warnings, please. | |
e22ea7cc | 5387 | local $^W = 0; # != 0 is magical below |
69893cff RGS |
5388 | |
5389 | # This file's got a breakpoint in it. | |
e22ea7cc | 5390 | $had_breakpoints{$file} |= 1; |
69893cff RGS |
5391 | |
5392 | # Last line in file. | |
e22ea7cc | 5393 | my $max = $#dbline; |
69893cff RGS |
5394 | |
5395 | # Search forward until we hit a breakable line or get to | |
5396 | # the end of the file. | |
e22ea7cc | 5397 | ++$i until $dbline[$i] != 0 or $i >= $max; |
69893cff RGS |
5398 | |
5399 | # Copy the breakpoint in and delete it from %postponed. | |
e22ea7cc | 5400 | $dbline{$i} = delete $postponed{$subname}; |
69893cff RGS |
5401 | } ## end if ($i) |
5402 | ||
5403 | # find_sub didn't find the sub. | |
e22ea7cc RF |
5404 | else { |
5405 | local $\ = ''; | |
5406 | print $OUT "Subroutine $subname not found.\n"; | |
5407 | } | |
5408 | return; | |
5409 | } ## end if ($postponed{$subname... | |
5410 | elsif ( $postponed{$subname} eq 'compile' ) { $signal = 1 } | |
5411 | ||
5412 | #print $OUT "In postponed_sub for `$subname'.\n"; | |
5413 | } ## end sub postponed_sub | |
eda6e075 | 5414 | |
69893cff RGS |
5415 | =head2 C<postponed> |
5416 | ||
5417 | Called after each required file is compiled, but before it is executed; | |
5418 | also called if the name of a just-compiled subroutine is a key of | |
5419 | C<%postponed>. Propagates saved breakpoints (from C<b compile>, C<b load>, | |
5420 | etc.) into the just-compiled code. | |
5421 | ||
5422 | If this is a C<require>'d file, the incoming parameter is the glob | |
5423 | C<*{"_<$filename"}>, with C<$filename> the name of the C<require>'d file. | |
5424 | ||
5425 | If it's a subroutine, the incoming parameter is the subroutine name. | |
5426 | ||
5427 | =cut | |
5428 | ||
d12a4851 | 5429 | sub postponed { |
e22ea7cc | 5430 | |
69893cff RGS |
5431 | # If there's a break, process it. |
5432 | if ($ImmediateStop) { | |
69893cff | 5433 | |
e22ea7cc RF |
5434 | # Right, we've stopped. Turn it off. |
5435 | $ImmediateStop = 0; | |
5436 | ||
5437 | # Enter the command loop when DB::DB gets called. | |
5438 | $signal = 1; | |
69893cff RGS |
5439 | } |
5440 | ||
5441 | # If this is a subroutine, let postponed_sub() deal with it. | |
e22ea7cc | 5442 | return &postponed_sub unless ref \$_[0] eq 'GLOB'; |
69893cff RGS |
5443 | |
5444 | # Not a subroutine. Deal with the file. | |
5445 | local *dbline = shift; | |
5446 | my $filename = $dbline; | |
5447 | $filename =~ s/^_<//; | |
5448 | local $\ = ''; | |
5449 | $signal = 1, print $OUT "'$filename' loaded...\n" | |
e22ea7cc RF |
5450 | if $break_on_load{$filename}; |
5451 | print_lineinfo( ' ' x $stack_depth, "Package $filename.\n" ) if $frame; | |
69893cff RGS |
5452 | |
5453 | # Do we have any breakpoints to put in this file? | |
5454 | return unless $postponed_file{$filename}; | |
5455 | ||
5456 | # Yes. Mark this file as having breakpoints. | |
5457 | $had_breakpoints{$filename} |= 1; | |
5458 | ||
5459 | # "Cannot be done: unsufficient magic" - we can't just put the | |
5460 | # breakpoints saved in %postponed_file into %dbline by assigning | |
5461 | # the whole hash; we have to do it one item at a time for the | |
5462 | # breakpoints to be set properly. | |
5463 | #%dbline = %{$postponed_file{$filename}}; | |
5464 | ||
5465 | # Set the breakpoints, one at a time. | |
5466 | my $key; | |
5467 | ||
e22ea7cc RF |
5468 | for $key ( keys %{ $postponed_file{$filename} } ) { |
5469 | ||
5470 | # Stash the saved breakpoint into the current file's magic line array. | |
5471 | $dbline{$key} = ${ $postponed_file{$filename} }{$key}; | |
69893cff RGS |
5472 | } |
5473 | ||
5474 | # This file's been compiled; discard the stored breakpoints. | |
5475 | delete $postponed_file{$filename}; | |
5476 | ||
5477 | } ## end sub postponed | |
5478 | ||
5479 | =head2 C<dumpit> | |
5480 | ||
5481 | C<dumpit> is the debugger's wrapper around dumpvar.pl. | |
5482 | ||
5483 | It gets a filehandle (to which C<dumpvar.pl>'s output will be directed) and | |
5484 | a reference to a variable (the thing to be dumped) as its input. | |
5485 | ||
5486 | The incoming filehandle is selected for output (C<dumpvar.pl> is printing to | |
5487 | the currently-selected filehandle, thank you very much). The current | |
5488 | values of the package globals C<$single> and C<$trace> are backed up in | |
5489 | lexicals, and they are turned off (this keeps the debugger from trying | |
5490 | to single-step through C<dumpvar.pl> (I think.)). C<$frame> is localized to | |
5491 | preserve its current value and it is set to zero to prevent entry/exit | |
5492 | messages from printing, and C<$doret> is localized as well and set to -2 to | |
5493 | prevent return values from being shown. | |
5494 | ||
5495 | C<dumpit()> then checks to see if it needs to load C<dumpvar.pl> and | |
5496 | tries to load it (note: if you have a C<dumpvar.pl> ahead of the | |
be9a9b1d | 5497 | installed version in C<@INC>, yours will be used instead. Possible security |
69893cff RGS |
5498 | problem?). |
5499 | ||
5500 | It then checks to see if the subroutine C<main::dumpValue> is now defined | |
5501 | (it should have been defined by C<dumpvar.pl>). If it has, C<dumpit()> | |
5502 | localizes the globals necessary for things to be sane when C<main::dumpValue()> | |
5503 | is called, and picks up the variable to be dumped from the parameter list. | |
5504 | ||
5505 | It checks the package global C<%options> to see if there's a C<dumpDepth> | |
5506 | specified. If not, -1 is assumed; if so, the supplied value gets passed on to | |
5507 | C<dumpvar.pl>. This tells C<dumpvar.pl> where to leave off when dumping a | |
5508 | structure: -1 means dump everything. | |
5509 | ||
5510 | C<dumpValue()> is then called if possible; if not, C<dumpit()>just prints a | |
5511 | warning. | |
5512 | ||
5513 | In either case, C<$single>, C<$trace>, C<$frame>, and C<$doret> are restored | |
5514 | and we then return to the caller. | |
5515 | ||
5516 | =cut | |
eda6e075 | 5517 | |
d12a4851 | 5518 | sub dumpit { |
e22ea7cc | 5519 | |
69893cff RGS |
5520 | # Save the current output filehandle and switch to the one |
5521 | # passed in as the first parameter. | |
d12a4851 | 5522 | local ($savout) = select(shift); |
69893cff RGS |
5523 | |
5524 | # Save current settings of $single and $trace, and then turn them off. | |
d12a4851 | 5525 | my $osingle = $single; |
69893cff | 5526 | my $otrace = $trace; |
d12a4851 | 5527 | $single = $trace = 0; |
69893cff RGS |
5528 | |
5529 | # XXX Okay, what do $frame and $doret do, again? | |
d12a4851 JH |
5530 | local $frame = 0; |
5531 | local $doret = -2; | |
69893cff RGS |
5532 | |
5533 | # Load dumpvar.pl unless we've already got the sub we need from it. | |
e22ea7cc | 5534 | unless ( defined &main::dumpValue ) { |
e81465be | 5535 | do 'dumpvar.pl' or die $@; |
d12a4851 | 5536 | } |
69893cff RGS |
5537 | |
5538 | # If the load succeeded (or we already had dumpvalue()), go ahead | |
5539 | # and dump things. | |
e22ea7cc | 5540 | if ( defined &main::dumpValue ) { |
d12a4851 JH |
5541 | local $\ = ''; |
5542 | local $, = ''; | |
5543 | local $" = ' '; | |
5544 | my $v = shift; | |
5545 | my $maxdepth = shift || $option{dumpDepth}; | |
e22ea7cc RF |
5546 | $maxdepth = -1 unless defined $maxdepth; # -1 means infinite depth |
5547 | &main::dumpValue( $v, $maxdepth ); | |
69893cff RGS |
5548 | } ## end if (defined &main::dumpValue) |
5549 | ||
5550 | # Oops, couldn't load dumpvar.pl. | |
5551 | else { | |
d12a4851 | 5552 | local $\ = ''; |
e22ea7cc | 5553 | print $OUT "dumpvar.pl not available.\n"; |
d12a4851 | 5554 | } |
69893cff RGS |
5555 | |
5556 | # Reset $single and $trace to their old values. | |
d12a4851 | 5557 | $single = $osingle; |
e22ea7cc | 5558 | $trace = $otrace; |
69893cff RGS |
5559 | |
5560 | # Restore the old filehandle. | |
e22ea7cc | 5561 | select($savout); |
69893cff RGS |
5562 | } ## end sub dumpit |
5563 | ||
5564 | =head2 C<print_trace> | |
5565 | ||
5566 | C<print_trace>'s job is to print a stack trace. It does this via the | |
5567 | C<dump_trace> routine, which actually does all the ferreting-out of the | |
5568 | stack trace data. C<print_trace> takes care of formatting it nicely and | |
5569 | printing it to the proper filehandle. | |
5570 | ||
5571 | Parameters: | |
5572 | ||
5573 | =over 4 | |
5574 | ||
be9a9b1d AT |
5575 | =item * |
5576 | ||
5577 | The filehandle to print to. | |
69893cff | 5578 | |
be9a9b1d | 5579 | =item * |
69893cff | 5580 | |
be9a9b1d | 5581 | How many frames to skip before starting trace. |
69893cff | 5582 | |
be9a9b1d AT |
5583 | =item * |
5584 | ||
5585 | How many frames to print. | |
5586 | ||
5587 | =item * | |
5588 | ||
5589 | A flag: if true, print a I<short> trace without filenames, line numbers, or arguments | |
69893cff RGS |
5590 | |
5591 | =back | |
5592 | ||
5593 | The original comment below seems to be noting that the traceback may not be | |
5594 | correct if this routine is called in a tied method. | |
5595 | ||
5596 | =cut | |
eda6e075 | 5597 | |
d12a4851 | 5598 | # Tied method do not create a context, so may get wrong message: |
eda6e075 | 5599 | |
d12a4851 | 5600 | sub print_trace { |
e22ea7cc RF |
5601 | local $\ = ''; |
5602 | my $fh = shift; | |
5603 | ||
69893cff RGS |
5604 | # If this is going to a slave editor, but we're not the primary |
5605 | # debugger, reset it first. | |
e22ea7cc RF |
5606 | resetterm(1) |
5607 | if $fh eq $LINEINFO # slave editor | |
5608 | and $LINEINFO eq $OUT # normal output | |
5609 | and $term_pid != $$; # not the primary | |
69893cff RGS |
5610 | |
5611 | # Collect the actual trace information to be formatted. | |
5612 | # This is an array of hashes of subroutine call info. | |
e22ea7cc | 5613 | my @sub = dump_trace( $_[0] + 1, $_[1] ); |
69893cff RGS |
5614 | |
5615 | # Grab the "short report" flag from @_. | |
e22ea7cc | 5616 | my $short = $_[2]; # Print short report, next one for sub name |
69893cff RGS |
5617 | |
5618 | # Run through the traceback info, format it, and print it. | |
e22ea7cc RF |
5619 | my $s; |
5620 | for ( $i = 0 ; $i <= $#sub ; $i++ ) { | |
5621 | ||
69893cff | 5622 | # Drop out if the user has lost interest and hit control-C. |
e22ea7cc | 5623 | last if $signal; |
69893cff | 5624 | |
e22ea7cc RF |
5625 | # Set the separator so arrys print nice. |
5626 | local $" = ', '; | |
69893cff RGS |
5627 | |
5628 | # Grab and stringify the arguments if they are there. | |
e22ea7cc RF |
5629 | my $args = |
5630 | defined $sub[$i]{args} | |
5631 | ? "(@{ $sub[$i]{args} })" | |
5632 | : ''; | |
5633 | ||
69893cff | 5634 | # Shorten them up if $maxtrace says they're too long. |
e22ea7cc RF |
5635 | $args = ( substr $args, 0, $maxtrace - 3 ) . '...' |
5636 | if length $args > $maxtrace; | |
69893cff RGS |
5637 | |
5638 | # Get the file name. | |
e22ea7cc | 5639 | my $file = $sub[$i]{file}; |
69893cff RGS |
5640 | |
5641 | # Put in a filename header if short is off. | |
e22ea7cc | 5642 | $file = $file eq '-e' ? $file : "file `$file'" unless $short; |
69893cff RGS |
5643 | |
5644 | # Get the actual sub's name, and shorten to $maxtrace's requirement. | |
e22ea7cc RF |
5645 | $s = $sub[$i]{sub}; |
5646 | $s = ( substr $s, 0, $maxtrace - 3 ) . '...' if length $s > $maxtrace; | |
69893cff RGS |
5647 | |
5648 | # Short report uses trimmed file and sub names. | |
e22ea7cc RF |
5649 | if ($short) { |
5650 | my $sub = @_ >= 4 ? $_[3] : $s; | |
5651 | print $fh "$sub[$i]{context}=$sub$args from $file:$sub[$i]{line}\n"; | |
5652 | } ## end if ($short) | |
69893cff RGS |
5653 | |
5654 | # Non-short report includes full names. | |
e22ea7cc RF |
5655 | else { |
5656 | print $fh "$sub[$i]{context} = $s$args" | |
5657 | . " called from $file" | |
5658 | . " line $sub[$i]{line}\n"; | |
5659 | } | |
69893cff RGS |
5660 | } ## end for ($i = 0 ; $i <= $#sub... |
5661 | } ## end sub print_trace | |
5662 | ||
5663 | =head2 dump_trace(skip[,count]) | |
5664 | ||
5665 | Actually collect the traceback information available via C<caller()>. It does | |
5666 | some filtering and cleanup of the data, but mostly it just collects it to | |
5667 | make C<print_trace()>'s job easier. | |
5668 | ||
5669 | C<skip> defines the number of stack frames to be skipped, working backwards | |
5670 | from the most current. C<count> determines the total number of frames to | |
5671 | be returned; all of them (well, the first 10^9) are returned if C<count> | |
5672 | is omitted. | |
5673 | ||
5674 | This routine returns a list of hashes, from most-recent to least-recent | |
5675 | stack frame. Each has the following keys and values: | |
5676 | ||
5677 | =over 4 | |
5678 | ||
5679 | =item * C<context> - C<.> (null), C<$> (scalar), or C<@> (array) | |
5680 | ||
5681 | =item * C<sub> - subroutine name, or C<eval> information | |
5682 | ||
5683 | =item * C<args> - undef, or a reference to an array of arguments | |
5684 | ||
5685 | =item * C<file> - the file in which this item was defined (if any) | |
5686 | ||
5687 | =item * C<line> - the line on which it was defined | |
5688 | ||
5689 | =back | |
5690 | ||
5691 | =cut | |
eda6e075 | 5692 | |
d12a4851 | 5693 | sub dump_trace { |
69893cff RGS |
5694 | |
5695 | # How many levels to skip. | |
e22ea7cc | 5696 | my $skip = shift; |
69893cff RGS |
5697 | |
5698 | # How many levels to show. (1e9 is a cheap way of saying "all of them"; | |
5699 | # it's unlikely that we'll have more than a billion stack frames. If you | |
5700 | # do, you've got an awfully big machine...) | |
e22ea7cc | 5701 | my $count = shift || 1e9; |
69893cff RGS |
5702 | |
5703 | # We increment skip because caller(1) is the first level *back* from | |
e22ea7cc | 5704 | # the current one. Add $skip to the count of frames so we have a |
69893cff | 5705 | # simple stop criterion, counting from $skip to $count+$skip. |
e22ea7cc RF |
5706 | $skip++; |
5707 | $count += $skip; | |
69893cff RGS |
5708 | |
5709 | # These variables are used to capture output from caller(); | |
e22ea7cc | 5710 | my ( $p, $file, $line, $sub, $h, $context ); |
69893cff | 5711 | |
e22ea7cc | 5712 | my ( $e, $r, @a, @sub, $args ); |
69893cff RGS |
5713 | |
5714 | # XXX Okay... why'd we do that? | |
e22ea7cc RF |
5715 | my $nothard = not $frame & 8; |
5716 | local $frame = 0; | |
69893cff RGS |
5717 | |
5718 | # Do not want to trace this. | |
e22ea7cc RF |
5719 | my $otrace = $trace; |
5720 | $trace = 0; | |
69893cff RGS |
5721 | |
5722 | # Start out at the skip count. | |
5723 | # If we haven't reached the number of frames requested, and caller() is | |
5724 | # still returning something, stay in the loop. (If we pass the requested | |
5725 | # number of stack frames, or we run out - caller() returns nothing - we | |
5726 | # quit. | |
5727 | # Up the stack frame index to go back one more level each time. | |
e22ea7cc RF |
5728 | for ( |
5729 | $i = $skip ; | |
5730 | $i < $count | |
5731 | and ( $p, $file, $line, $sub, $h, $context, $e, $r ) = caller($i) ; | |
5732 | $i++ | |
5733 | ) | |
69893cff RGS |
5734 | { |
5735 | ||
5736 | # Go through the arguments and save them for later. | |
e22ea7cc RF |
5737 | @a = (); |
5738 | for $arg (@args) { | |
5739 | my $type; | |
5740 | if ( not defined $arg ) { # undefined parameter | |
5741 | push @a, "undef"; | |
5742 | } | |
5743 | ||
5744 | elsif ( $nothard and tied $arg ) { # tied parameter | |
5745 | push @a, "tied"; | |
5746 | } | |
5747 | elsif ( $nothard and $type = ref $arg ) { # reference | |
5748 | push @a, "ref($type)"; | |
5749 | } | |
5750 | else { # can be stringified | |
5751 | local $_ = | |
5752 | "$arg"; # Safe to stringify now - should not call f(). | |
69893cff RGS |
5753 | |
5754 | # Backslash any single-quotes or backslashes. | |
e22ea7cc | 5755 | s/([\'\\])/\\$1/g; |
69893cff RGS |
5756 | |
5757 | # Single-quote it unless it's a number or a colon-separated | |
5758 | # name. | |
e22ea7cc RF |
5759 | s/(.*)/'$1'/s |
5760 | unless /^(?: -?[\d.]+ | \*[\w:]* )$/x; | |
69893cff RGS |
5761 | |
5762 | # Turn high-bit characters into meta-whatever. | |
e22ea7cc | 5763 | s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg; |
69893cff RGS |
5764 | |
5765 | # Turn control characters into ^-whatever. | |
e22ea7cc | 5766 | s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg; |
69893cff | 5767 | |
e22ea7cc | 5768 | push( @a, $_ ); |
69893cff RGS |
5769 | } ## end else [ if (not defined $arg) |
5770 | } ## end for $arg (@args) | |
5771 | ||
5772 | # If context is true, this is array (@)context. | |
5773 | # If context is false, this is scalar ($) context. | |
e22ea7cc | 5774 | # If neither, context isn't defined. (This is apparently a 'can't |
69893cff | 5775 | # happen' trap.) |
e22ea7cc | 5776 | $context = $context ? '@' : ( defined $context ? "\$" : '.' ); |
69893cff RGS |
5777 | |
5778 | # if the sub has args ($h true), make an anonymous array of the | |
5779 | # dumped args. | |
e22ea7cc | 5780 | $args = $h ? [@a] : undef; |
69893cff RGS |
5781 | |
5782 | # remove trailing newline-whitespace-semicolon-end of line sequence | |
5783 | # from the eval text, if any. | |
e22ea7cc | 5784 | $e =~ s/\n\s*\;\s*\Z// if $e; |
69893cff RGS |
5785 | |
5786 | # Escape backslashed single-quotes again if necessary. | |
e22ea7cc | 5787 | $e =~ s/([\\\'])/\\$1/g if $e; |
69893cff RGS |
5788 | |
5789 | # if the require flag is true, the eval text is from a require. | |
e22ea7cc RF |
5790 | if ($r) { |
5791 | $sub = "require '$e'"; | |
5792 | } | |
5793 | ||
69893cff | 5794 | # if it's false, the eval text is really from an eval. |
e22ea7cc RF |
5795 | elsif ( defined $r ) { |
5796 | $sub = "eval '$e'"; | |
5797 | } | |
69893cff RGS |
5798 | |
5799 | # If the sub is '(eval)', this is a block eval, meaning we don't | |
5800 | # know what the eval'ed text actually was. | |
e22ea7cc RF |
5801 | elsif ( $sub eq '(eval)' ) { |
5802 | $sub = "eval {...}"; | |
5803 | } | |
69893cff RGS |
5804 | |
5805 | # Stick the collected information into @sub as an anonymous hash. | |
e22ea7cc RF |
5806 | push( |
5807 | @sub, | |
5808 | { | |
5809 | context => $context, | |
5810 | sub => $sub, | |
5811 | args => $args, | |
5812 | file => $file, | |
5813 | line => $line | |
5814 | } | |
69893cff RGS |
5815 | ); |
5816 | ||
5817 | # Stop processing frames if the user hit control-C. | |
e22ea7cc | 5818 | last if $signal; |
69893cff RGS |
5819 | } ## end for ($i = $skip ; $i < ... |
5820 | ||
5821 | # Restore the trace value again. | |
e22ea7cc RF |
5822 | $trace = $otrace; |
5823 | @sub; | |
69893cff RGS |
5824 | } ## end sub dump_trace |
5825 | ||
5826 | =head2 C<action()> | |
5827 | ||
5828 | C<action()> takes input provided as the argument to an add-action command, | |
5829 | either pre- or post-, and makes sure it's a complete command. It doesn't do | |
5830 | any fancy parsing; it just keeps reading input until it gets a string | |
5831 | without a trailing backslash. | |
5832 | ||
5833 | =cut | |
eda6e075 | 5834 | |
d12a4851 JH |
5835 | sub action { |
5836 | my $action = shift; | |
69893cff | 5837 | |
e22ea7cc RF |
5838 | while ( $action =~ s/\\$// ) { |
5839 | ||
69893cff | 5840 | # We have a backslash on the end. Read more. |
e22ea7cc | 5841 | $action .= &gets; |
69893cff RGS |
5842 | } ## end while ($action =~ s/\\$//) |
5843 | ||
5844 | # Return the assembled action. | |
d12a4851 | 5845 | $action; |
69893cff RGS |
5846 | } ## end sub action |
5847 | ||
5848 | =head2 unbalanced | |
5849 | ||
5850 | This routine mostly just packages up a regular expression to be used | |
5851 | to check that the thing it's being matched against has properly-matched | |
5852 | curly braces. | |
5853 | ||
be9a9b1d | 5854 | Of note is the definition of the C<$balanced_brace_re> global via C<||=>, which |
69893cff RGS |
5855 | speeds things up by only creating the qr//'ed expression once; if it's |
5856 | already defined, we don't try to define it again. A speed hack. | |
5857 | ||
5858 | =cut | |
eda6e075 | 5859 | |
e22ea7cc | 5860 | sub unbalanced { |
69893cff RGS |
5861 | |
5862 | # I hate using globals! | |
d12a4851 | 5863 | $balanced_brace_re ||= qr{ |
e22ea7cc RF |
5864 | ^ \{ |
5865 | (?: | |
5866 | (?> [^{}] + ) # Non-parens without backtracking | |
5867 | | | |
5868 | (??{ $balanced_brace_re }) # Group with matching parens | |
5869 | ) * | |
5870 | \} $ | |
d12a4851 | 5871 | }x; |
e22ea7cc | 5872 | return $_[0] !~ m/$balanced_brace_re/; |
69893cff RGS |
5873 | } ## end sub unbalanced |
5874 | ||
5875 | =head2 C<gets()> | |
5876 | ||
5877 | C<gets()> is a primitive (very primitive) routine to read continuations. | |
5878 | It was devised for reading continuations for actions. | |
be9a9b1d | 5879 | it just reads more input with C<readline()> and returns it. |
69893cff RGS |
5880 | |
5881 | =cut | |
eda6e075 | 5882 | |
d12a4851 JH |
5883 | sub gets { |
5884 | &readline("cont: "); | |
5885 | } | |
eda6e075 | 5886 | |
69893cff RGS |
5887 | =head2 C<DB::system()> - handle calls to<system()> without messing up the debugger |
5888 | ||
5889 | The C<system()> function assumes that it can just go ahead and use STDIN and | |
5890 | STDOUT, but under the debugger, we want it to use the debugger's input and | |
5891 | outout filehandles. | |
5892 | ||
5893 | C<DB::system()> socks away the program's STDIN and STDOUT, and then substitutes | |
5894 | the debugger's IN and OUT filehandles for them. It does the C<system()> call, | |
5895 | and then puts everything back again. | |
5896 | ||
5897 | =cut | |
5898 | ||
d12a4851 | 5899 | sub system { |
e22ea7cc | 5900 | |
d12a4851 JH |
5901 | # We save, change, then restore STDIN and STDOUT to avoid fork() since |
5902 | # some non-Unix systems can do system() but have problems with fork(). | |
e22ea7cc RF |
5903 | open( SAVEIN, "<&STDIN" ) || &warn("Can't save STDIN"); |
5904 | open( SAVEOUT, ">&STDOUT" ) || &warn("Can't save STDOUT"); | |
5905 | open( STDIN, "<&IN" ) || &warn("Can't redirect STDIN"); | |
5906 | open( STDOUT, ">&OUT" ) || &warn("Can't redirect STDOUT"); | |
eda6e075 | 5907 | |
d12a4851 JH |
5908 | # XXX: using csh or tcsh destroys sigint retvals! |
5909 | system(@_); | |
e22ea7cc RF |
5910 | open( STDIN, "<&SAVEIN" ) || &warn("Can't restore STDIN"); |
5911 | open( STDOUT, ">&SAVEOUT" ) || &warn("Can't restore STDOUT"); | |
5912 | close(SAVEIN); | |
d12a4851 | 5913 | close(SAVEOUT); |
eda6e075 | 5914 | |
d12a4851 | 5915 | # most of the $? crud was coping with broken cshisms |
e22ea7cc RF |
5916 | if ( $? >> 8 ) { |
5917 | &warn( "(Command exited ", ( $? >> 8 ), ")\n" ); | |
5918 | } | |
5919 | elsif ($?) { | |
5920 | &warn( | |
5921 | "(Command died of SIG#", | |
5922 | ( $? & 127 ), | |
5923 | ( ( $? & 128 ) ? " -- core dumped" : "" ), | |
5924 | ")", "\n" | |
69893cff RGS |
5925 | ); |
5926 | } ## end elsif ($?) | |
eda6e075 | 5927 | |
d12a4851 | 5928 | return $?; |
eda6e075 | 5929 | |
69893cff RGS |
5930 | } ## end sub system |
5931 | ||
5932 | =head1 TTY MANAGEMENT | |
5933 | ||
5934 | The subs here do some of the terminal management for multiple debuggers. | |
5935 | ||
5936 | =head2 setterm | |
5937 | ||
5938 | Top-level function called when we want to set up a new terminal for use | |
5939 | by the debugger. | |
5940 | ||
5941 | If the C<noTTY> debugger option was set, we'll either use the terminal | |
5942 | supplied (the value of the C<noTTY> option), or we'll use C<Term::Rendezvous> | |
5943 | to find one. If we're a forked debugger, we call C<resetterm> to try to | |
5944 | get a whole new terminal if we can. | |
5945 | ||
5946 | In either case, we set up the terminal next. If the C<ReadLine> option was | |
5947 | true, we'll get a C<Term::ReadLine> object for the current terminal and save | |
5948 | the appropriate attributes. We then | |
5949 | ||
5950 | =cut | |
eda6e075 | 5951 | |
d12a4851 | 5952 | sub setterm { |
e22ea7cc | 5953 | |
69893cff | 5954 | # Load Term::Readline, but quietly; don't debug it and don't trace it. |
d12a4851 JH |
5955 | local $frame = 0; |
5956 | local $doret = -2; | |
5957 | eval { require Term::ReadLine } or die $@; | |
69893cff RGS |
5958 | |
5959 | # If noTTY is set, but we have a TTY name, go ahead and hook up to it. | |
d12a4851 | 5960 | if ($notty) { |
e22ea7cc RF |
5961 | if ($tty) { |
5962 | my ( $i, $o ) = split $tty, /,/; | |
5963 | $o = $i unless defined $o; | |
5964 | open( IN, "<$i" ) or die "Cannot open TTY `$i' for read: $!"; | |
5965 | open( OUT, ">$o" ) or die "Cannot open TTY `$o' for write: $!"; | |
5966 | $IN = \*IN; | |
5967 | $OUT = \*OUT; | |
5968 | my $sel = select($OUT); | |
5969 | $| = 1; | |
5970 | select($sel); | |
69893cff RGS |
5971 | } ## end if ($tty) |
5972 | ||
5973 | # We don't have a TTY - try to find one via Term::Rendezvous. | |
e22ea7cc RF |
5974 | else { |
5975 | eval "require Term::Rendezvous;" or die; | |
5976 | ||
69893cff | 5977 | # See if we have anything to pass to Term::Rendezvous. |
b0e77abc BD |
5978 | # Use $HOME/.perldbtty$$ if not. |
5979 | my $rv = $ENV{PERLDB_NOTTY} || "$ENV{HOME}/.perldbtty$$"; | |
69893cff RGS |
5980 | |
5981 | # Rendezvous and get the filehandles. | |
e22ea7cc RF |
5982 | my $term_rv = new Term::Rendezvous $rv; |
5983 | $IN = $term_rv->IN; | |
5984 | $OUT = $term_rv->OUT; | |
69893cff RGS |
5985 | } ## end else [ if ($tty) |
5986 | } ## end if ($notty) | |
5987 | ||
69893cff | 5988 | # We're a daughter debugger. Try to fork off another TTY. |
e22ea7cc RF |
5989 | if ( $term_pid eq '-1' ) { # In a TTY with another debugger |
5990 | resetterm(2); | |
d12a4851 | 5991 | } |
69893cff RGS |
5992 | |
5993 | # If we shouldn't use Term::ReadLine, don't. | |
e22ea7cc RF |
5994 | if ( !$rl ) { |
5995 | $term = new Term::ReadLine::Stub 'perldb', $IN, $OUT; | |
5996 | } | |
d12a4851 | 5997 | |
69893cff RGS |
5998 | # We're using Term::ReadLine. Get all the attributes for this terminal. |
5999 | else { | |
e22ea7cc RF |
6000 | $term = new Term::ReadLine 'perldb', $IN, $OUT; |
6001 | ||
6002 | $rl_attribs = $term->Attribs; | |
6003 | $rl_attribs->{basic_word_break_characters} .= '-:+/*,[])}' | |
6004 | if defined $rl_attribs->{basic_word_break_characters} | |
6005 | and index( $rl_attribs->{basic_word_break_characters}, ":" ) == -1; | |
6006 | $rl_attribs->{special_prefixes} = '$@&%'; | |
6007 | $rl_attribs->{completer_word_break_characters} .= '$@&%'; | |
6008 | $rl_attribs->{completion_function} = \&db_complete; | |
69893cff RGS |
6009 | } ## end else [ if (!$rl) |
6010 | ||
6011 | # Set up the LINEINFO filehandle. | |
e22ea7cc | 6012 | $LINEINFO = $OUT unless defined $LINEINFO; |
d12a4851 | 6013 | $lineinfo = $console unless defined $lineinfo; |
69893cff | 6014 | |
d12a4851 | 6015 | $term->MinLine(2); |
69893cff | 6016 | |
5561b870 A |
6017 | &load_hist(); |
6018 | ||
e22ea7cc RF |
6019 | if ( $term->Features->{setHistory} and "@hist" ne "?" ) { |
6020 | $term->SetHistory(@hist); | |
d12a4851 | 6021 | } |
69893cff RGS |
6022 | |
6023 | # XXX Ornaments are turned on unconditionally, which is not | |
6024 | # always a good thing. | |
d12a4851 JH |
6025 | ornaments($ornaments) if defined $ornaments; |
6026 | $term_pid = $$; | |
69893cff RGS |
6027 | } ## end sub setterm |
6028 | ||
5561b870 A |
6029 | sub load_hist { |
6030 | $histfile //= option_val("HistFile", undef); | |
6031 | return unless defined $histfile; | |
6032 | open my $fh, "<", $histfile or return; | |
6033 | local $/ = "\n"; | |
6034 | @hist = (); | |
6035 | while (<$fh>) { | |
6036 | chomp; | |
6037 | push @hist, $_; | |
6038 | } | |
6039 | close $fh; | |
6040 | } | |
6041 | ||
6042 | sub save_hist { | |
6043 | return unless defined $histfile; | |
6044 | eval { require File::Path } or return; | |
6045 | eval { require File::Basename } or return; | |
6046 | File::Path::mkpath(File::Basename::dirname($histfile)); | |
6047 | open my $fh, ">", $histfile or die "Could not open '$histfile': $!"; | |
6048 | $histsize //= option_val("HistSize",100); | |
6049 | my @copy = grep { $_ ne '?' } @hist; | |
6050 | my $start = scalar(@copy) > $histsize ? scalar(@copy)-$histsize : 0; | |
6051 | for ($start .. $#copy) { | |
6052 | print $fh "$copy[$_]\n"; | |
6053 | } | |
6054 | close $fh or die "Could not write '$histfile': $!"; | |
6055 | } | |
6056 | ||
69893cff RGS |
6057 | =head1 GET_FORK_TTY EXAMPLE FUNCTIONS |
6058 | ||
6059 | When the process being debugged forks, or the process invokes a command | |
6060 | via C<system()> which starts a new debugger, we need to be able to get a new | |
6061 | C<IN> and C<OUT> filehandle for the new debugger. Otherwise, the two processes | |
6062 | fight over the terminal, and you can never quite be sure who's going to get the | |
6063 | input you're typing. | |
6064 | ||
6065 | C<get_fork_TTY> is a glob-aliased function which calls the real function that | |
6066 | is tasked with doing all the necessary operating system mojo to get a new | |
6067 | TTY (and probably another window) and to direct the new debugger to read and | |
6068 | write there. | |
6069 | ||
6fae1ad7 RF |
6070 | The debugger provides C<get_fork_TTY> functions which work for X Windows, |
6071 | OS/2, and Mac OS X. Other systems are not supported. You are encouraged | |
6072 | to write C<get_fork_TTY> functions which work for I<your> platform | |
6073 | and contribute them. | |
69893cff RGS |
6074 | |
6075 | =head3 C<xterm_get_fork_TTY> | |
6076 | ||
6077 | This function provides the C<get_fork_TTY> function for X windows. If a | |
6078 | program running under the debugger forks, a new <xterm> window is opened and | |
6079 | the subsidiary debugger is directed there. | |
6080 | ||
6081 | The C<open()> call is of particular note here. We have the new C<xterm> | |
6082 | we're spawning route file number 3 to STDOUT, and then execute the C<tty> | |
6083 | command (which prints the device name of the TTY we'll want to use for input | |
6084 | and output to STDOUT, then C<sleep> for a very long time, routing this output | |
6085 | to file number 3. This way we can simply read from the <XT> filehandle (which | |
6086 | is STDOUT from the I<commands> we ran) to get the TTY we want to use. | |
6087 | ||
6088 | Only works if C<xterm> is in your path and C<$ENV{DISPLAY}>, etc. are | |
6089 | properly set up. | |
6090 | ||
6091 | =cut | |
eda6e075 | 6092 | |
d12a4851 | 6093 | sub xterm_get_fork_TTY { |
e22ea7cc RF |
6094 | ( my $name = $0 ) =~ s,^.*[/\\],,s; |
6095 | open XT, | |
69893cff | 6096 | qq[3>&1 xterm -title "Daughter Perl debugger $pids $name" -e sh -c 'tty 1>&3;\ |
d12a4851 | 6097 | sleep 10000000' |]; |
69893cff RGS |
6098 | |
6099 | # Get the output from 'tty' and clean it up a little. | |
e22ea7cc RF |
6100 | my $tty = <XT>; |
6101 | chomp $tty; | |
69893cff | 6102 | |
e22ea7cc | 6103 | $pidprompt = ''; # Shown anyway in titlebar |
69893cff | 6104 | |
98274836 JM |
6105 | # We need $term defined or we can not switch to the newly created xterm |
6106 | if ($tty ne '' && !defined $term) { | |
6107 | eval { require Term::ReadLine } or die $@; | |
6108 | if ( !$rl ) { | |
6109 | $term = new Term::ReadLine::Stub 'perldb', $IN, $OUT; | |
6110 | } | |
6111 | else { | |
6112 | $term = new Term::ReadLine 'perldb', $IN, $OUT; | |
6113 | } | |
6114 | } | |
69893cff | 6115 | # There's our new TTY. |
e22ea7cc | 6116 | return $tty; |
69893cff RGS |
6117 | } ## end sub xterm_get_fork_TTY |
6118 | ||
6119 | =head3 C<os2_get_fork_TTY> | |
6120 | ||
6121 | XXX It behooves an OS/2 expert to write the necessary documentation for this! | |
6122 | ||
6123 | =cut | |
eda6e075 | 6124 | |
d12a4851 | 6125 | # This example function resets $IN, $OUT itself |
619a0444 IZ |
6126 | my $c_pipe = 0; |
6127 | sub os2_get_fork_TTY { # A simplification of the following (and works without): | |
e22ea7cc | 6128 | local $\ = ''; |
e22ea7cc | 6129 | ( my $name = $0 ) =~ s,^.*[/\\],,s; |
619a0444 IZ |
6130 | my %opt = ( title => "Daughter Perl debugger $pids $name", |
6131 | ($rl ? (read_by_key => 1) : ()) ); | |
6132 | require OS2::Process; | |
6133 | my ($in, $out, $pid) = eval { OS2::Process::io_term(related => 0, %opt) } | |
6134 | or return; | |
6135 | $pidprompt = ''; # Shown anyway in titlebar | |
6136 | reset_IN_OUT($in, $out); | |
6137 | $tty = '*reset*'; | |
6138 | return ''; # Indicate that reset_IN_OUT is called | |
69893cff RGS |
6139 | } ## end sub os2_get_fork_TTY |
6140 | ||
6fae1ad7 RF |
6141 | =head3 C<macosx_get_fork_TTY> |
6142 | ||
6143 | The Mac OS X version uses AppleScript to tell Terminal.app to create | |
6144 | a new window. | |
6145 | ||
6146 | =cut | |
6147 | ||
6148 | # Notes about Terminal.app's AppleScript support, | |
6149 | # (aka things that might break in future OS versions). | |
6150 | # | |
6151 | # The "do script" command doesn't return a reference to the new window | |
6152 | # it creates, but since it appears frontmost and windows are enumerated | |
6153 | # front to back, we can use "first window" === "window 1". | |
6154 | # | |
52cd570b BL |
6155 | # Since "do script" is implemented by supplying the argument (plus a |
6156 | # return character) as terminal input, there's a potential race condition | |
6157 | # where the debugger could beat the shell to reading the command. | |
6158 | # To prevent this, we wait for the screen to clear before proceeding. | |
6159 | # | |
d457cffc BL |
6160 | # 10.3 and 10.4: |
6161 | # There's no direct accessor for the tty device name, so we fiddle | |
6162 | # with the window title options until it says what we want. | |
6163 | # | |
6164 | # 10.5: | |
6165 | # There _is_ a direct accessor for the tty device name, _and_ there's | |
6166 | # a new possible component of the window title (the name of the settings | |
6167 | # set). A separate version is needed. | |
6fae1ad7 | 6168 | |
d457cffc | 6169 | my @script_versions= |
6fae1ad7 | 6170 | |
d457cffc BL |
6171 | ([237, <<'__LEOPARD__'], |
6172 | tell application "Terminal" | |
6173 | do script "clear;exec sleep 100000" | |
6174 | tell first tab of first window | |
6175 | copy tty to thetty | |
6176 | set custom title to "forked perl debugger" | |
6177 | set title displays custom title to true | |
6178 | repeat while (length of first paragraph of (get contents)) > 0 | |
6179 | delay 0.1 | |
6180 | end repeat | |
6181 | end tell | |
6182 | end tell | |
6183 | thetty | |
6184 | __LEOPARD__ | |
6185 | ||
6186 | [100, <<'__JAGUAR_TIGER__'], | |
6fae1ad7 RF |
6187 | tell application "Terminal" |
6188 | do script "clear;exec sleep 100000" | |
6189 | tell first window | |
6190 | set title displays shell path to false | |
6191 | set title displays window size to false | |
6192 | set title displays file name to false | |
6193 | set title displays device name to true | |
6194 | set title displays custom title to true | |
6195 | set custom title to "" | |
d457cffc | 6196 | copy "/dev/" & name to thetty |
6fae1ad7 | 6197 | set custom title to "forked perl debugger" |
52cd570b BL |
6198 | repeat while (length of first paragraph of (get contents)) > 0 |
6199 | delay 0.1 | |
6200 | end repeat | |
6fae1ad7 RF |
6201 | end tell |
6202 | end tell | |
d457cffc BL |
6203 | thetty |
6204 | __JAGUAR_TIGER__ | |
6205 | ||
6206 | ); | |
6207 | ||
6208 | sub macosx_get_fork_TTY | |
6209 | { | |
6210 | my($version,$script,$pipe,$tty); | |
6fae1ad7 | 6211 | |
d457cffc BL |
6212 | return unless $version=$ENV{TERM_PROGRAM_VERSION}; |
6213 | foreach my $entry (@script_versions) { | |
6214 | if ($version>=$entry->[0]) { | |
6215 | $script=$entry->[1]; | |
6216 | last; | |
6217 | } | |
6218 | } | |
6219 | return unless defined($script); | |
6220 | return unless open($pipe,'-|','/usr/bin/osascript','-e',$script); | |
6fae1ad7 RF |
6221 | $tty=readline($pipe); |
6222 | close($pipe); | |
6223 | return unless defined($tty) && $tty =~ m(^/dev/); | |
6224 | chomp $tty; | |
6225 | return $tty; | |
6226 | } | |
6227 | ||
69893cff | 6228 | =head2 C<create_IN_OUT($flags)> |
eda6e075 | 6229 | |
69893cff RGS |
6230 | Create a new pair of filehandles, pointing to a new TTY. If impossible, |
6231 | try to diagnose why. | |
6232 | ||
6233 | Flags are: | |
6234 | ||
6235 | =over 4 | |
6236 | ||
6237 | =item * 1 - Don't know how to create a new TTY. | |
6238 | ||
6239 | =item * 2 - Debugger has forked, but we can't get a new TTY. | |
6240 | ||
6241 | =item * 4 - standard debugger startup is happening. | |
6242 | ||
6243 | =back | |
6244 | ||
6245 | =cut | |
6246 | ||
6247 | sub create_IN_OUT { # Create a window with IN/OUT handles redirected there | |
6248 | ||
6249 | # If we know how to get a new TTY, do it! $in will have | |
6250 | # the TTY name if get_fork_TTY works. | |
d12a4851 | 6251 | my $in = &get_fork_TTY if defined &get_fork_TTY; |
69893cff | 6252 | |
e22ea7cc RF |
6253 | # It used to be that |
6254 | $in = $fork_TTY if defined $fork_TTY; # Backward compatibility | |
6255 | ||
6256 | if ( not defined $in ) { | |
6257 | my $why = shift; | |
69893cff RGS |
6258 | |
6259 | # We don't know how. | |
e22ea7cc | 6260 | print_help(<<EOP) if $why == 1; |
d12a4851 JH |
6261 | I<#########> Forked, but do not know how to create a new B<TTY>. I<#########> |
6262 | EOP | |
69893cff RGS |
6263 | |
6264 | # Forked debugger. | |
e22ea7cc | 6265 | print_help(<<EOP) if $why == 2; |
d12a4851 JH |
6266 | I<#########> Daughter session, do not know how to change a B<TTY>. I<#########> |
6267 | This may be an asynchronous session, so the parent debugger may be active. | |
6268 | EOP | |
69893cff RGS |
6269 | |
6270 | # Note that both debuggers are fighting over the same input. | |
e22ea7cc | 6271 | print_help(<<EOP) if $why != 4; |
d12a4851 | 6272 | Since two debuggers fight for the same TTY, input is severely entangled. |
eda6e075 | 6273 | |
d12a4851 | 6274 | EOP |
e22ea7cc | 6275 | print_help(<<EOP); |
6fae1ad7 RF |
6276 | I know how to switch the output to a different window in xterms, OS/2 |
6277 | consoles, and Mac OS X Terminal.app only. For a manual switch, put the name | |
6278 | of the created I<TTY> in B<\$DB::fork_TTY>, or define a function | |
6279 | B<DB::get_fork_TTY()> returning this. | |
eda6e075 | 6280 | |
d12a4851 JH |
6281 | On I<UNIX>-like systems one can get the name of a I<TTY> for the given window |
6282 | by typing B<tty>, and disconnect the I<shell> from I<TTY> by B<sleep 1000000>. | |
eda6e075 | 6283 | |
d12a4851 | 6284 | EOP |
69893cff | 6285 | } ## end if (not defined $in) |
e22ea7cc RF |
6286 | elsif ( $in ne '' ) { |
6287 | TTY($in); | |
6288 | } | |
69893cff | 6289 | else { |
e22ea7cc | 6290 | $console = ''; # Indicate no need to open-from-the-console |
d12a4851 JH |
6291 | } |
6292 | undef $fork_TTY; | |
69893cff RGS |
6293 | } ## end sub create_IN_OUT |
6294 | ||
6295 | =head2 C<resetterm> | |
6296 | ||
6297 | Handles rejiggering the prompt when we've forked off a new debugger. | |
6298 | ||
6299 | If the new debugger happened because of a C<system()> that invoked a | |
6300 | program under the debugger, the arrow between the old pid and the new | |
6301 | in the prompt has I<two> dashes instead of one. | |
6302 | ||
6303 | We take the current list of pids and add this one to the end. If there | |
6304 | isn't any list yet, we make one up out of the initial pid associated with | |
6305 | the terminal and our new pid, sticking an arrow (either one-dashed or | |
6306 | two dashed) in between them. | |
6307 | ||
6308 | If C<CreateTTY> is off, or C<resetterm> was called with no arguments, | |
6309 | we don't try to create a new IN and OUT filehandle. Otherwise, we go ahead | |
6310 | and try to do that. | |
eda6e075 | 6311 | |
69893cff RGS |
6312 | =cut |
6313 | ||
e22ea7cc | 6314 | sub resetterm { # We forked, so we need a different TTY |
69893cff RGS |
6315 | |
6316 | # Needs to be passed to create_IN_OUT() as well. | |
d12a4851 | 6317 | my $in = shift; |
69893cff RGS |
6318 | |
6319 | # resetterm(2): got in here because of a system() starting a debugger. | |
6320 | # resetterm(1): just forked. | |
d12a4851 | 6321 | my $systemed = $in > 1 ? '-' : ''; |
69893cff RGS |
6322 | |
6323 | # If there's already a list of pids, add this to the end. | |
d12a4851 | 6324 | if ($pids) { |
e22ea7cc RF |
6325 | $pids =~ s/\]/$systemed->$$]/; |
6326 | } | |
69893cff RGS |
6327 | |
6328 | # No pid list. Time to make one. | |
6329 | else { | |
e22ea7cc | 6330 | $pids = "[$term_pid->$$]"; |
d12a4851 | 6331 | } |
69893cff RGS |
6332 | |
6333 | # The prompt we're going to be using for this debugger. | |
d12a4851 | 6334 | $pidprompt = $pids; |
69893cff RGS |
6335 | |
6336 | # We now 0wnz this terminal. | |
d12a4851 | 6337 | $term_pid = $$; |
69893cff RGS |
6338 | |
6339 | # Just return if we're not supposed to try to create a new TTY. | |
d12a4851 | 6340 | return unless $CreateTTY & $in; |
69893cff RGS |
6341 | |
6342 | # Try to create a new IN/OUT pair. | |
d12a4851 | 6343 | create_IN_OUT($in); |
69893cff RGS |
6344 | } ## end sub resetterm |
6345 | ||
6346 | =head2 C<readline> | |
6347 | ||
6348 | First, we handle stuff in the typeahead buffer. If there is any, we shift off | |
6349 | the next line, print a message saying we got it, add it to the terminal | |
6350 | history (if possible), and return it. | |
6351 | ||
6352 | If there's nothing in the typeahead buffer, check the command filehandle stack. | |
6353 | If there are any filehandles there, read from the last one, and return the line | |
6354 | if we got one. If not, we pop the filehandle off and close it, and try the | |
6355 | next one up the stack. | |
6356 | ||
6357 | If we've emptied the filehandle stack, we check to see if we've got a socket | |
6358 | open, and we read that and return it if we do. If we don't, we just call the | |
6359 | core C<readline()> and return its value. | |
6360 | ||
6361 | =cut | |
eda6e075 | 6362 | |
d12a4851 | 6363 | sub readline { |
69893cff RGS |
6364 | |
6365 | # Localize to prevent it from being smashed in the program being debugged. | |
e22ea7cc | 6366 | local $.; |
69893cff RGS |
6367 | |
6368 | # Pull a line out of the typeahead if there's stuff there. | |
e22ea7cc RF |
6369 | if (@typeahead) { |
6370 | ||
69893cff | 6371 | # How many lines left. |
e22ea7cc | 6372 | my $left = @typeahead; |
69893cff RGS |
6373 | |
6374 | # Get the next line. | |
e22ea7cc | 6375 | my $got = shift @typeahead; |
69893cff RGS |
6376 | |
6377 | # Print a message saying we got input from the typeahead. | |
e22ea7cc RF |
6378 | local $\ = ''; |
6379 | print $OUT "auto(-$left)", shift, $got, "\n"; | |
69893cff RGS |
6380 | |
6381 | # Add it to the terminal history (if possible). | |
e22ea7cc RF |
6382 | $term->AddHistory($got) |
6383 | if length($got) > 1 | |
6384 | and defined $term->Features->{addHistory}; | |
6385 | return $got; | |
69893cff RGS |
6386 | } ## end if (@typeahead) |
6387 | ||
e22ea7cc | 6388 | # We really need to read some input. Turn off entry/exit trace and |
69893cff | 6389 | # return value printing. |
e22ea7cc RF |
6390 | local $frame = 0; |
6391 | local $doret = -2; | |
69893cff RGS |
6392 | |
6393 | # If there are stacked filehandles to read from ... | |
e22ea7cc RF |
6394 | while (@cmdfhs) { |
6395 | ||
69893cff | 6396 | # Read from the last one in the stack. |
e22ea7cc RF |
6397 | my $line = CORE::readline( $cmdfhs[-1] ); |
6398 | ||
69893cff | 6399 | # If we got a line ... |
e22ea7cc RF |
6400 | defined $line |
6401 | ? ( print $OUT ">> $line" and return $line ) # Echo and return | |
6402 | : close pop @cmdfhs; # Pop and close | |
69893cff RGS |
6403 | } ## end while (@cmdfhs) |
6404 | ||
6405 | # Nothing on the filehandle stack. Socket? | |
e22ea7cc RF |
6406 | if ( ref $OUT and UNIVERSAL::isa( $OUT, 'IO::Socket::INET' ) ) { |
6407 | ||
69893cff | 6408 | # Send anyting we have to send. |
e22ea7cc | 6409 | $OUT->write( join( '', @_ ) ); |
69893cff RGS |
6410 | |
6411 | # Receive anything there is to receive. | |
a85de320 BD |
6412 | $stuff; |
6413 | my $stuff = ''; | |
6414 | my $buf; | |
6415 | do { | |
6416 | $IN->recv( $buf = '', 2048 ); # XXX "what's wrong with sysread?" | |
6417 | # XXX Don't know. You tell me. | |
6418 | } while length $buf and ($stuff .= $buf) !~ /\n/; | |
69893cff RGS |
6419 | |
6420 | # What we got. | |
e22ea7cc | 6421 | $stuff; |
69893cff RGS |
6422 | } ## end if (ref $OUT and UNIVERSAL::isa... |
6423 | ||
6424 | # No socket. Just read from the terminal. | |
e22ea7cc RF |
6425 | else { |
6426 | $term->readline(@_); | |
6427 | } | |
69893cff RGS |
6428 | } ## end sub readline |
6429 | ||
6430 | =head1 OPTIONS SUPPORT ROUTINES | |
6431 | ||
6432 | These routines handle listing and setting option values. | |
6433 | ||
6434 | =head2 C<dump_option> - list the current value of an option setting | |
6435 | ||
6436 | This routine uses C<option_val> to look up the value for an option. | |
6437 | It cleans up escaped single-quotes and then displays the option and | |
6438 | its value. | |
6439 | ||
6440 | =cut | |
eda6e075 | 6441 | |
d12a4851 | 6442 | sub dump_option { |
e22ea7cc RF |
6443 | my ( $opt, $val ) = @_; |
6444 | $val = option_val( $opt, 'N/A' ); | |
d12a4851 JH |
6445 | $val =~ s/([\\\'])/\\$1/g; |
6446 | printf $OUT "%20s = '%s'\n", $opt, $val; | |
69893cff RGS |
6447 | } ## end sub dump_option |
6448 | ||
d12a4851 | 6449 | sub options2remember { |
e22ea7cc RF |
6450 | foreach my $k (@RememberOnROptions) { |
6451 | $option{$k} = option_val( $k, 'N/A' ); | |
6452 | } | |
6453 | return %option; | |
d12a4851 | 6454 | } |
eda6e075 | 6455 | |
69893cff RGS |
6456 | =head2 C<option_val> - find the current value of an option |
6457 | ||
6458 | This can't just be a simple hash lookup because of the indirect way that | |
6459 | the option values are stored. Some are retrieved by calling a subroutine, | |
6460 | some are just variables. | |
6461 | ||
6462 | You must supply a default value to be used in case the option isn't set. | |
6463 | ||
6464 | =cut | |
6465 | ||
d12a4851 | 6466 | sub option_val { |
e22ea7cc | 6467 | my ( $opt, $default ) = @_; |
d12a4851 | 6468 | my $val; |
69893cff RGS |
6469 | |
6470 | # Does this option exist, and is it a variable? | |
6471 | # If so, retrieve the value via the value in %optionVars. | |
e22ea7cc RF |
6472 | if ( defined $optionVars{$opt} |
6473 | and defined ${ $optionVars{$opt} } ) | |
6474 | { | |
69893cff RGS |
6475 | $val = ${ $optionVars{$opt} }; |
6476 | } | |
6477 | ||
6478 | # Does this option exist, and it's a subroutine? | |
6479 | # If so, call the subroutine via the ref in %optionAction | |
6480 | # and capture the value. | |
e22ea7cc RF |
6481 | elsif ( defined $optionAction{$opt} |
6482 | and defined &{ $optionAction{$opt} } ) | |
6483 | { | |
6484 | $val = &{ $optionAction{$opt} }(); | |
6485 | } | |
69893cff RGS |
6486 | |
6487 | # If there's an action or variable for the supplied option, | |
6488 | # but no value was set, use the default. | |
6489 | elsif (defined $optionAction{$opt} and not defined $option{$opt} | |
e22ea7cc | 6490 | or defined $optionVars{$opt} and not defined ${ $optionVars{$opt} } ) |
69893cff RGS |
6491 | { |
6492 | $val = $default; | |
e22ea7cc | 6493 | } |
69893cff RGS |
6494 | |
6495 | # Otherwise, do the simple hash lookup. | |
6496 | else { | |
e22ea7cc | 6497 | $val = $option{$opt}; |
d12a4851 | 6498 | } |
69893cff RGS |
6499 | |
6500 | # If the value isn't defined, use the default. | |
6501 | # Then return whatever the value is. | |
d12a4851 | 6502 | $val = $default unless defined $val; |
e22ea7cc | 6503 | $val; |
69893cff RGS |
6504 | } ## end sub option_val |
6505 | ||
6506 | =head2 C<parse_options> | |
6507 | ||
6508 | Handles the parsing and execution of option setting/displaying commands. | |
6509 | ||
be9a9b1d | 6510 | An option entered by itself is assumed to be I<set me to 1> (the default value) |
69893cff | 6511 | if the option is a boolean one. If not, the user is prompted to enter a valid |
be9a9b1d | 6512 | value or to query the current value (via C<option? >). |
69893cff | 6513 | |
be9a9b1d | 6514 | If C<option=value> is entered, we try to extract a quoted string from the |
69893cff RGS |
6515 | value (if it is quoted). If it's not, we just use the whole value as-is. |
6516 | ||
6517 | We load any modules required to service this option, and then we set it: if | |
6518 | it just gets stuck in a variable, we do that; if there's a subroutine to | |
6519 | handle setting the option, we call that. | |
6520 | ||
6521 | Finally, if we're running in interactive mode, we display the effect of the | |
6522 | user's command back to the terminal, skipping this if we're setting things | |
6523 | during initialization. | |
6524 | ||
6525 | =cut | |
eda6e075 | 6526 | |
d12a4851 | 6527 | sub parse_options { |
e22ea7cc | 6528 | local ($_) = @_; |
d12a4851 | 6529 | local $\ = ''; |
69893cff RGS |
6530 | |
6531 | # These options need a value. Don't allow them to be clobbered by accident. | |
e22ea7cc RF |
6532 | my %opt_needs_val = map { ( $_ => 1 ) } qw{ |
6533 | dumpDepth arrayDepth hashDepth LineInfo maxTraceLen ornaments windowSize | |
6534 | pager quote ReadLine recallCommand RemotePort ShellBang TTY CommandSet | |
d12a4851 | 6535 | }; |
69893cff | 6536 | |
d12a4851 | 6537 | while (length) { |
e22ea7cc | 6538 | my $val_defaulted; |
69893cff RGS |
6539 | |
6540 | # Clean off excess leading whitespace. | |
e22ea7cc | 6541 | s/^\s+// && next; |
69893cff RGS |
6542 | |
6543 | # Options are always all word characters, followed by a non-word | |
6544 | # separator. | |
e22ea7cc RF |
6545 | s/^(\w+)(\W?)// or print( $OUT "Invalid option `$_'\n" ), last; |
6546 | my ( $opt, $sep ) = ( $1, $2 ); | |
69893cff | 6547 | |
e22ea7cc RF |
6548 | # Make sure that such an option exists. |
6549 | my $matches = grep( /^\Q$opt/ && ( $option = $_ ), @options ) | |
6550 | || grep( /^\Q$opt/i && ( $option = $_ ), @options ); | |
6551 | ||
6552 | print( $OUT "Unknown option `$opt'\n" ), next unless $matches; | |
6553 | print( $OUT "Ambiguous option `$opt'\n" ), next if $matches > 1; | |
6554 | my $val; | |
69893cff RGS |
6555 | |
6556 | # '?' as separator means query, but must have whitespace after it. | |
e22ea7cc RF |
6557 | if ( "?" eq $sep ) { |
6558 | print( $OUT "Option query `$opt?' followed by non-space `$_'\n" ), | |
6559 | last | |
6560 | if /^\S/; | |
69893cff | 6561 | |
e22ea7cc RF |
6562 | #&dump_option($opt); |
6563 | } ## end if ("?" eq $sep) | |
69893cff RGS |
6564 | |
6565 | # Separator is whitespace (or just a carriage return). | |
6566 | # They're going for a default, which we assume is 1. | |
e22ea7cc RF |
6567 | elsif ( $sep !~ /\S/ ) { |
6568 | $val_defaulted = 1; | |
6569 | $val = "1"; # this is an evil default; make 'em set it! | |
6570 | } | |
69893cff RGS |
6571 | |
6572 | # Separator is =. Trying to set a value. | |
e22ea7cc RF |
6573 | elsif ( $sep eq "=" ) { |
6574 | ||
69893cff | 6575 | # If quoted, extract a quoted string. |
e22ea7cc | 6576 | if (s/ (["']) ( (?: \\. | (?! \1 ) [^\\] )* ) \1 //x) { |
d12a4851 | 6577 | my $quote = $1; |
e22ea7cc RF |
6578 | ( $val = $2 ) =~ s/\\([$quote\\])/$1/g; |
6579 | } | |
69893cff RGS |
6580 | |
6581 | # Not quoted. Use the whole thing. Warn about 'option='. | |
e22ea7cc RF |
6582 | else { |
6583 | s/^(\S*)//; | |
6584 | $val = $1; | |
6585 | print OUT qq(Option better cleared using $opt=""\n) | |
6586 | unless length $val; | |
6587 | } ## end else [ if (s/ (["']) ( (?: \\. | (?! \1 ) [^\\] )* ) \1 //x) | |
6588 | ||
6589 | } ## end elsif ($sep eq "=") | |
6590 | ||
6591 | # "Quoted" with [], <>, or {}. | |
6592 | else { #{ to "let some poor schmuck bounce on the % key in B<vi>." | |
6593 | my ($end) = | |
6594 | "\\" . substr( ")]>}$sep", index( "([<{", $sep ), 1 ); #} | |
6595 | s/^(([^\\$end]|\\[\\$end])*)$end($|\s+)// | |
6596 | or print( $OUT "Unclosed option value `$opt$sep$_'\n" ), last; | |
6597 | ( $val = $1 ) =~ s/\\([\\$end])/$1/g; | |
6598 | } ## end else [ if ("?" eq $sep) | |
69893cff RGS |
6599 | |
6600 | # Exclude non-booleans from getting set to 1 by default. | |
e22ea7cc RF |
6601 | if ( $opt_needs_val{$option} && $val_defaulted ) { |
6602 | my $cmd = ( $CommandSet eq '580' ) ? 'o' : 'O'; | |
6603 | print $OUT | |
6604 | "Option `$opt' is non-boolean. Use `$cmd $option=VAL' to set, `$cmd $option?' to query\n"; | |
6605 | next; | |
6606 | } ## end if ($opt_needs_val{$option... | |
69893cff RGS |
6607 | |
6608 | # Save the option value. | |
e22ea7cc | 6609 | $option{$option} = $val if defined $val; |
69893cff RGS |
6610 | |
6611 | # Load any module that this option requires. | |
e22ea7cc RF |
6612 | eval qq{ |
6613 | local \$frame = 0; | |
6614 | local \$doret = -2; | |
6615 | require '$optionRequire{$option}'; | |
6616 | 1; | |
6617 | } || die # XXX: shouldn't happen | |
6618 | if defined $optionRequire{$option} | |
6619 | && defined $val; | |
6620 | ||
6621 | # Set it. | |
69893cff | 6622 | # Stick it in the proper variable if it goes in a variable. |
e22ea7cc RF |
6623 | ${ $optionVars{$option} } = $val |
6624 | if defined $optionVars{$option} | |
6625 | && defined $val; | |
69893cff RGS |
6626 | |
6627 | # Call the appropriate sub if it gets set via sub. | |
e22ea7cc RF |
6628 | &{ $optionAction{$option} }($val) |
6629 | if defined $optionAction{$option} | |
6630 | && defined &{ $optionAction{$option} } | |
6631 | && defined $val; | |
d12a4851 | 6632 | |
69893cff | 6633 | # Not initialization - echo the value we set it to. |
e22ea7cc | 6634 | dump_option($option) unless $OUT eq \*STDERR; |
69893cff RGS |
6635 | } ## end while (length) |
6636 | } ## end sub parse_options | |
6637 | ||
6638 | =head1 RESTART SUPPORT | |
6639 | ||
6640 | These routines are used to store (and restore) lists of items in environment | |
6641 | variables during a restart. | |
6642 | ||
6643 | =head2 set_list | |
6644 | ||
6645 | Set_list packages up items to be stored in a set of environment variables | |
6646 | (VAR_n, containing the number of items, and VAR_0, VAR_1, etc., containing | |
6647 | the values). Values outside the standard ASCII charset are stored by encoding | |
6648 | then as hexadecimal values. | |
6649 | ||
6650 | =cut | |
eda6e075 | 6651 | |
d12a4851 | 6652 | sub set_list { |
e22ea7cc RF |
6653 | my ( $stem, @list ) = @_; |
6654 | my $val; | |
69893cff RGS |
6655 | |
6656 | # VAR_n: how many we have. Scalar assignment gets the number of items. | |
e22ea7cc | 6657 | $ENV{"${stem}_n"} = @list; |
69893cff RGS |
6658 | |
6659 | # Grab each item in the list, escape the backslashes, encode the non-ASCII | |
6660 | # as hex, and then save in the appropriate VAR_0, VAR_1, etc. | |
e22ea7cc RF |
6661 | for $i ( 0 .. $#list ) { |
6662 | $val = $list[$i]; | |
6663 | $val =~ s/\\/\\\\/g; | |
6664 | $val =~ s/([\0-\37\177\200-\377])/"\\0x" . unpack('H2',$1)/eg; | |
6665 | $ENV{"${stem}_$i"} = $val; | |
69893cff RGS |
6666 | } ## end for $i (0 .. $#list) |
6667 | } ## end sub set_list | |
6668 | ||
6669 | =head2 get_list | |
6670 | ||
6671 | Reverse the set_list operation: grab VAR_n to see how many we should be getting | |
6672 | back, and then pull VAR_0, VAR_1. etc. back out. | |
6673 | ||
6674 | =cut | |
eda6e075 | 6675 | |
d12a4851 | 6676 | sub get_list { |
e22ea7cc RF |
6677 | my $stem = shift; |
6678 | my @list; | |
6679 | my $n = delete $ENV{"${stem}_n"}; | |
6680 | my $val; | |
6681 | for $i ( 0 .. $n - 1 ) { | |
6682 | $val = delete $ENV{"${stem}_$i"}; | |
6683 | $val =~ s/\\((\\)|0x(..))/ $2 ? $2 : pack('H2', $3) /ge; | |
6684 | push @list, $val; | |
6685 | } | |
6686 | @list; | |
69893cff RGS |
6687 | } ## end sub get_list |
6688 | ||
6689 | =head1 MISCELLANEOUS SIGNAL AND I/O MANAGEMENT | |
6690 | ||
6691 | =head2 catch() | |
6692 | ||
6693 | The C<catch()> subroutine is the essence of fast and low-impact. We simply | |
6694 | set an already-existing global scalar variable to a constant value. This | |
6695 | avoids allocating any memory possibly in the middle of something that will | |
3c4b39be | 6696 | get all confused if we do, particularly under I<unsafe signals>. |
69893cff RGS |
6697 | |
6698 | =cut | |
eda6e075 | 6699 | |
d12a4851 JH |
6700 | sub catch { |
6701 | $signal = 1; | |
69893cff | 6702 | return; # Put nothing on the stack - malloc/free land! |
d12a4851 | 6703 | } |
eda6e075 | 6704 | |
69893cff RGS |
6705 | =head2 C<warn()> |
6706 | ||
6707 | C<warn> emits a warning, by joining together its arguments and printing | |
6708 | them, with couple of fillips. | |
6709 | ||
6710 | If the composited message I<doesn't> end with a newline, we automatically | |
6711 | add C<$!> and a newline to the end of the message. The subroutine expects $OUT | |
6712 | to be set to the filehandle to be used to output warnings; it makes no | |
6713 | assumptions about what filehandles are available. | |
6714 | ||
6715 | =cut | |
6716 | ||
d12a4851 | 6717 | sub warn { |
e22ea7cc | 6718 | my ($msg) = join( "", @_ ); |
d12a4851 JH |
6719 | $msg .= ": $!\n" unless $msg =~ /\n$/; |
6720 | local $\ = ''; | |
6721 | print $OUT $msg; | |
69893cff RGS |
6722 | } ## end sub warn |
6723 | ||
6724 | =head1 INITIALIZATION TTY SUPPORT | |
6725 | ||
6726 | =head2 C<reset_IN_OUT> | |
6727 | ||
6728 | This routine handles restoring the debugger's input and output filehandles | |
6729 | after we've tried and failed to move them elsewhere. In addition, it assigns | |
6730 | the debugger's output filehandle to $LINEINFO if it was already open there. | |
6731 | ||
6732 | =cut | |
eda6e075 | 6733 | |
d12a4851 JH |
6734 | sub reset_IN_OUT { |
6735 | my $switch_li = $LINEINFO eq $OUT; | |
69893cff RGS |
6736 | |
6737 | # If there's a term and it's able to get a new tty, try to get one. | |
e22ea7cc RF |
6738 | if ( $term and $term->Features->{newTTY} ) { |
6739 | ( $IN, $OUT ) = ( shift, shift ); | |
6740 | $term->newTTY( $IN, $OUT ); | |
69893cff RGS |
6741 | } |
6742 | ||
6743 | # This term can't get a new tty now. Better luck later. | |
6744 | elsif ($term) { | |
6745 | &warn("Too late to set IN/OUT filehandles, enabled on next `R'!\n"); | |
e22ea7cc | 6746 | } |
69893cff RGS |
6747 | |
6748 | # Set the filehndles up as they were. | |
6749 | else { | |
e22ea7cc | 6750 | ( $IN, $OUT ) = ( shift, shift ); |
d12a4851 | 6751 | } |
69893cff RGS |
6752 | |
6753 | # Unbuffer the output filehandle. | |
d12a4851 JH |
6754 | my $o = select $OUT; |
6755 | $| = 1; | |
6756 | select $o; | |
69893cff RGS |
6757 | |
6758 | # Point LINEINFO to the same output filehandle if it was there before. | |
d12a4851 | 6759 | $LINEINFO = $OUT if $switch_li; |
69893cff RGS |
6760 | } ## end sub reset_IN_OUT |
6761 | ||
6762 | =head1 OPTION SUPPORT ROUTINES | |
6763 | ||
6764 | The following routines are used to process some of the more complicated | |
6765 | debugger options. | |
6766 | ||
6767 | =head2 C<TTY> | |
6768 | ||
6769 | Sets the input and output filehandles to the specified files or pipes. | |
6770 | If the terminal supports switching, we go ahead and do it. If not, and | |
6771 | there's already a terminal in place, we save the information to take effect | |
6772 | on restart. | |
6773 | ||
6774 | If there's no terminal yet (for instance, during debugger initialization), | |
6775 | we go ahead and set C<$console> and C<$tty> to the file indicated. | |
6776 | ||
6777 | =cut | |
eda6e075 | 6778 | |
d12a4851 | 6779 | sub TTY { |
cd1191f1 | 6780 | |
e22ea7cc RF |
6781 | if ( @_ and $term and $term->Features->{newTTY} ) { |
6782 | ||
69893cff RGS |
6783 | # This terminal supports switching to a new TTY. |
6784 | # Can be a list of two files, or on string containing both names, | |
6785 | # comma-separated. | |
6786 | # XXX Should this perhaps be an assignment from @_? | |
e22ea7cc RF |
6787 | my ( $in, $out ) = shift; |
6788 | if ( $in =~ /,/ ) { | |
6789 | ||
69893cff | 6790 | # Split list apart if supplied. |
e22ea7cc RF |
6791 | ( $in, $out ) = split /,/, $in, 2; |
6792 | } | |
6793 | else { | |
6794 | ||
69893cff | 6795 | # Use the same file for both input and output. |
e22ea7cc RF |
6796 | $out = $in; |
6797 | } | |
69893cff RGS |
6798 | |
6799 | # Open file onto the debugger's filehandles, if you can. | |
e22ea7cc RF |
6800 | open IN, $in or die "cannot open `$in' for read: $!"; |
6801 | open OUT, ">$out" or die "cannot open `$out' for write: $!"; | |
69893cff RGS |
6802 | |
6803 | # Swap to the new filehandles. | |
e22ea7cc | 6804 | reset_IN_OUT( \*IN, \*OUT ); |
69893cff RGS |
6805 | |
6806 | # Save the setting for later. | |
e22ea7cc | 6807 | return $tty = $in; |
69893cff RGS |
6808 | } ## end if (@_ and $term and $term... |
6809 | ||
6810 | # Terminal doesn't support new TTY, or doesn't support readline. | |
6811 | # Can't do it now, try restarting. | |
d12a4851 | 6812 | &warn("Too late to set TTY, enabled on next `R'!\n") if $term and @_; |
e22ea7cc | 6813 | |
d12a4851 JH |
6814 | # Useful if done through PERLDB_OPTS: |
6815 | $console = $tty = shift if @_; | |
69893cff RGS |
6816 | |
6817 | # Return whatever the TTY is. | |
d12a4851 | 6818 | $tty or $console; |
69893cff RGS |
6819 | } ## end sub TTY |
6820 | ||
6821 | =head2 C<noTTY> | |
6822 | ||
6823 | Sets the C<$notty> global, controlling whether or not the debugger tries to | |
6824 | get a terminal to read from. If called after a terminal is already in place, | |
6825 | we save the value to use it if we're restarted. | |
6826 | ||
6827 | =cut | |
eda6e075 | 6828 | |
d12a4851 JH |
6829 | sub noTTY { |
6830 | if ($term) { | |
69893cff | 6831 | &warn("Too late to set noTTY, enabled on next `R'!\n") if @_; |
d12a4851 JH |
6832 | } |
6833 | $notty = shift if @_; | |
6834 | $notty; | |
69893cff RGS |
6835 | } ## end sub noTTY |
6836 | ||
6837 | =head2 C<ReadLine> | |
6838 | ||
6839 | Sets the C<$rl> option variable. If 0, we use C<Term::ReadLine::Stub> | |
be9a9b1d | 6840 | (essentially, no C<readline> processing on this I<terminal>). Otherwise, we |
69893cff RGS |
6841 | use C<Term::ReadLine>. Can't be changed after a terminal's in place; we save |
6842 | the value in case a restart is done so we can change it then. | |
6843 | ||
6844 | =cut | |
eda6e075 | 6845 | |
d12a4851 JH |
6846 | sub ReadLine { |
6847 | if ($term) { | |
69893cff | 6848 | &warn("Too late to set ReadLine, enabled on next `R'!\n") if @_; |
d12a4851 JH |
6849 | } |
6850 | $rl = shift if @_; | |
6851 | $rl; | |
69893cff RGS |
6852 | } ## end sub ReadLine |
6853 | ||
6854 | =head2 C<RemotePort> | |
6855 | ||
6856 | Sets the port that the debugger will try to connect to when starting up. | |
6857 | If the terminal's already been set up, we can't do it, but we remember the | |
6858 | setting in case the user does a restart. | |
6859 | ||
6860 | =cut | |
eda6e075 | 6861 | |
d12a4851 JH |
6862 | sub RemotePort { |
6863 | if ($term) { | |
6864 | &warn("Too late to set RemotePort, enabled on next 'R'!\n") if @_; | |
6865 | } | |
6866 | $remoteport = shift if @_; | |
6867 | $remoteport; | |
69893cff RGS |
6868 | } ## end sub RemotePort |
6869 | ||
6870 | =head2 C<tkRunning> | |
6871 | ||
6872 | Checks with the terminal to see if C<Tk> is running, and returns true or | |
6873 | false. Returns false if the current terminal doesn't support C<readline>. | |
6874 | ||
6875 | =cut | |
eda6e075 | 6876 | |
d12a4851 | 6877 | sub tkRunning { |
e22ea7cc | 6878 | if ( ${ $term->Features }{tkRunning} ) { |
d12a4851 | 6879 | return $term->tkRunning(@_); |
e22ea7cc | 6880 | } |
69893cff | 6881 | else { |
e22ea7cc RF |
6882 | local $\ = ''; |
6883 | print $OUT "tkRunning not supported by current ReadLine package.\n"; | |
6884 | 0; | |
d12a4851 | 6885 | } |
69893cff RGS |
6886 | } ## end sub tkRunning |
6887 | ||
6888 | =head2 C<NonStop> | |
6889 | ||
6890 | Sets nonstop mode. If a terminal's already been set up, it's too late; the | |
6891 | debugger remembers the setting in case you restart, though. | |
6892 | ||
6893 | =cut | |
eda6e075 | 6894 | |
d12a4851 JH |
6895 | sub NonStop { |
6896 | if ($term) { | |
e22ea7cc | 6897 | &warn("Too late to set up NonStop mode, enabled on next `R'!\n") |
69893cff | 6898 | if @_; |
d12a4851 JH |
6899 | } |
6900 | $runnonstop = shift if @_; | |
6901 | $runnonstop; | |
69893cff RGS |
6902 | } ## end sub NonStop |
6903 | ||
d12a4851 JH |
6904 | sub DollarCaretP { |
6905 | if ($term) { | |
e22ea7cc RF |
6906 | &warn("Some flag changes could not take effect until next 'R'!\n") |
6907 | if @_; | |
d12a4851 JH |
6908 | } |
6909 | $^P = parse_DollarCaretP_flags(shift) if @_; | |
e22ea7cc | 6910 | expand_DollarCaretP_flags($^P); |
d12a4851 | 6911 | } |
eda6e075 | 6912 | |
69893cff RGS |
6913 | =head2 C<pager> |
6914 | ||
6915 | Set up the C<$pager> variable. Adds a pipe to the front unless there's one | |
6916 | there already. | |
6917 | ||
6918 | =cut | |
6919 | ||
d12a4851 JH |
6920 | sub pager { |
6921 | if (@_) { | |
69893cff | 6922 | $pager = shift; |
e22ea7cc | 6923 | $pager = "|" . $pager unless $pager =~ /^(\+?\>|\|)/; |
d12a4851 JH |
6924 | } |
6925 | $pager; | |
69893cff RGS |
6926 | } ## end sub pager |
6927 | ||
6928 | =head2 C<shellBang> | |
6929 | ||
6930 | Sets the shell escape command, and generates a printable copy to be used | |
6931 | in the help. | |
6932 | ||
6933 | =cut | |
eda6e075 | 6934 | |
d12a4851 | 6935 | sub shellBang { |
69893cff RGS |
6936 | |
6937 | # If we got an argument, meta-quote it, and add '\b' if it | |
6938 | # ends in a word character. | |
d12a4851 | 6939 | if (@_) { |
69893cff RGS |
6940 | $sh = quotemeta shift; |
6941 | $sh .= "\\b" if $sh =~ /\w$/; | |
d12a4851 | 6942 | } |
69893cff RGS |
6943 | |
6944 | # Generate the printable version for the help: | |
e22ea7cc RF |
6945 | $psh = $sh; # copy it |
6946 | $psh =~ s/\\b$//; # Take off trailing \b if any | |
6947 | $psh =~ s/\\(.)/$1/g; # De-escape | |
6948 | $psh; # return the printable version | |
69893cff RGS |
6949 | } ## end sub shellBang |
6950 | ||
6951 | =head2 C<ornaments> | |
6952 | ||
6953 | If the terminal has its own ornaments, fetch them. Otherwise accept whatever | |
6954 | was passed as the argument. (This means you can't override the terminal's | |
6955 | ornaments.) | |
6956 | ||
6957 | =cut | |
eda6e075 | 6958 | |
d12a4851 | 6959 | sub ornaments { |
e22ea7cc RF |
6960 | if ( defined $term ) { |
6961 | ||
69893cff | 6962 | # We don't want to show warning backtraces, but we do want die() ones. |
e22ea7cc | 6963 | local ( $warnLevel, $dieLevel ) = ( 0, 1 ); |
69893cff RGS |
6964 | |
6965 | # No ornaments if the terminal doesn't support them. | |
e22ea7cc RF |
6966 | return '' unless $term->Features->{ornaments}; |
6967 | eval { $term->ornaments(@_) } || ''; | |
6968 | } | |
69893cff RGS |
6969 | |
6970 | # Use what was passed in if we can't determine it ourselves. | |
6971 | else { | |
e22ea7cc RF |
6972 | $ornaments = shift; |
6973 | } | |
69893cff RGS |
6974 | } ## end sub ornaments |
6975 | ||
6976 | =head2 C<recallCommand> | |
6977 | ||
6978 | Sets the recall command, and builds a printable version which will appear in | |
6979 | the help text. | |
6980 | ||
6981 | =cut | |
eda6e075 | 6982 | |
d12a4851 | 6983 | sub recallCommand { |
69893cff RGS |
6984 | |
6985 | # If there is input, metaquote it. Add '\b' if it ends with a word | |
6986 | # character. | |
d12a4851 | 6987 | if (@_) { |
69893cff RGS |
6988 | $rc = quotemeta shift; |
6989 | $rc .= "\\b" if $rc =~ /\w$/; | |
d12a4851 | 6990 | } |
69893cff RGS |
6991 | |
6992 | # Build it into a printable version. | |
e22ea7cc RF |
6993 | $prc = $rc; # Copy it |
6994 | $prc =~ s/\\b$//; # Remove trailing \b | |
6995 | $prc =~ s/\\(.)/$1/g; # Remove escapes | |
6996 | $prc; # Return the printable version | |
69893cff RGS |
6997 | } ## end sub recallCommand |
6998 | ||
6999 | =head2 C<LineInfo> - where the line number information goes | |
7000 | ||
7001 | Called with no arguments, returns the file or pipe that line info should go to. | |
7002 | ||
7003 | Called with an argument (a file or a pipe), it opens that onto the | |
7004 | C<LINEINFO> filehandle, unbuffers the filehandle, and then returns the | |
7005 | file or pipe again to the caller. | |
7006 | ||
7007 | =cut | |
eda6e075 | 7008 | |
d12a4851 JH |
7009 | sub LineInfo { |
7010 | return $lineinfo unless @_; | |
7011 | $lineinfo = shift; | |
69893cff | 7012 | |
e22ea7cc | 7013 | # If this is a valid "thing to be opened for output", tack a |
69893cff | 7014 | # '>' onto the front. |
e22ea7cc | 7015 | my $stream = ( $lineinfo =~ /^(\+?\>|\|)/ ) ? $lineinfo : ">$lineinfo"; |
69893cff RGS |
7016 | |
7017 | # If this is a pipe, the stream points to a slave editor. | |
e22ea7cc | 7018 | $slave_editor = ( $stream =~ /^\|/ ); |
69893cff RGS |
7019 | |
7020 | # Open it up and unbuffer it. | |
e22ea7cc | 7021 | open( LINEINFO, "$stream" ) || &warn("Cannot open `$stream' for write"); |
d12a4851 JH |
7022 | $LINEINFO = \*LINEINFO; |
7023 | my $save = select($LINEINFO); | |
7024 | $| = 1; | |
7025 | select($save); | |
69893cff RGS |
7026 | |
7027 | # Hand the file or pipe back again. | |
d12a4851 | 7028 | $lineinfo; |
69893cff RGS |
7029 | } ## end sub LineInfo |
7030 | ||
7031 | =head1 COMMAND SUPPORT ROUTINES | |
7032 | ||
7033 | These subroutines provide functionality for various commands. | |
7034 | ||
7035 | =head2 C<list_modules> | |
7036 | ||
7037 | For the C<M> command: list modules loaded and their versions. | |
be9a9b1d AT |
7038 | Essentially just runs through the keys in %INC, picks each package's |
7039 | C<$VERSION> variable, gets the file name, and formats the information | |
7040 | for output. | |
69893cff RGS |
7041 | |
7042 | =cut | |
7043 | ||
e22ea7cc RF |
7044 | sub list_modules { # versions |
7045 | my %version; | |
7046 | my $file; | |
eda6e075 | 7047 | |
69893cff RGS |
7048 | # keys are the "as-loaded" name, values are the fully-qualified path |
7049 | # to the file itself. | |
e22ea7cc RF |
7050 | for ( keys %INC ) { |
7051 | $file = $_; # get the module name | |
7052 | s,\.p[lm]$,,i; # remove '.pl' or '.pm' | |
7053 | s,/,::,g; # change '/' to '::' | |
7054 | s/^perl5db$/DB/; # Special case: debugger | |
7055 | # moves to package DB | |
7056 | s/^Term::ReadLine::readline$/readline/; # simplify readline | |
7057 | ||
69893cff RGS |
7058 | # If the package has a $VERSION package global (as all good packages |
7059 | # should!) decode it and save as partial message. | |
e22ea7cc RF |
7060 | if ( defined ${ $_ . '::VERSION' } ) { |
7061 | $version{$file} = "${ $_ . '::VERSION' } from "; | |
7062 | } | |
69893cff RGS |
7063 | |
7064 | # Finish up the message with the file the package came from. | |
e22ea7cc | 7065 | $version{$file} .= $INC{$file}; |
69893cff RGS |
7066 | } ## end for (keys %INC) |
7067 | ||
7068 | # Hey, dumpit() formats a hash nicely, so why not use it? | |
e22ea7cc | 7069 | dumpit( $OUT, \%version ); |
69893cff RGS |
7070 | } ## end sub list_modules |
7071 | ||
7072 | =head2 C<sethelp()> | |
7073 | ||
7074 | Sets up the monster string used to format and print the help. | |
7075 | ||
7076 | =head3 HELP MESSAGE FORMAT | |
7077 | ||
be9a9b1d AT |
7078 | The help message is a peculiar format unto itself; it mixes C<pod> I<ornaments> |
7079 | (C<< B<> >> C<< I<> >>) with tabs to come up with a format that's fairly | |
69893cff RGS |
7080 | easy to parse and portable, but which still allows the help to be a little |
7081 | nicer than just plain text. | |
7082 | ||
be9a9b1d AT |
7083 | Essentially, you define the command name (usually marked up with C<< B<> >> |
7084 | and C<< I<> >>), followed by a tab, and then the descriptive text, ending in a | |
7085 | newline. The descriptive text can also be marked up in the same way. If you | |
7086 | need to continue the descriptive text to another line, start that line with | |
69893cff RGS |
7087 | just tabs and then enter the marked-up text. |
7088 | ||
7089 | If you are modifying the help text, I<be careful>. The help-string parser is | |
7090 | not very sophisticated, and if you don't follow these rules it will mangle the | |
7091 | help beyond hope until you fix the string. | |
7092 | ||
7093 | =cut | |
eda6e075 | 7094 | |
d12a4851 | 7095 | sub sethelp { |
69893cff | 7096 | |
d12a4851 JH |
7097 | # XXX: make sure there are tabs between the command and explanation, |
7098 | # or print_help will screw up your formatting if you have | |
7099 | # eeevil ornaments enabled. This is an insane mess. | |
eda6e075 | 7100 | |
d12a4851 | 7101 | $help = " |
e22ea7cc RF |
7102 | Help is currently only available for the new 5.8 command set. |
7103 | No help is available for the old command set. | |
7104 | We assume you know what you're doing if you switch to it. | |
eda6e075 | 7105 | |
69893cff RGS |
7106 | B<T> Stack trace. |
7107 | B<s> [I<expr>] Single step [in I<expr>]. | |
7108 | B<n> [I<expr>] Next, steps over subroutine calls [in I<expr>]. | |
7109 | <B<CR>> Repeat last B<n> or B<s> command. | |
7110 | B<r> Return from current subroutine. | |
7111 | B<c> [I<line>|I<sub>] Continue; optionally inserts a one-time-only breakpoint | |
7112 | at the specified position. | |
7113 | B<l> I<min>B<+>I<incr> List I<incr>+1 lines starting at I<min>. | |
7114 | B<l> I<min>B<->I<max> List lines I<min> through I<max>. | |
7115 | B<l> I<line> List single I<line>. | |
7116 | B<l> I<subname> List first window of lines from subroutine. | |
7117 | B<l> I<\$var> List first window of lines from subroutine referenced by I<\$var>. | |
7118 | B<l> List next window of lines. | |
7119 | B<-> List previous window of lines. | |
7120 | B<v> [I<line>] View window around I<line>. | |
7121 | B<.> Return to the executed line. | |
7122 | B<f> I<filename> Switch to viewing I<filename>. File must be already loaded. | |
7123 | I<filename> may be either the full name of the file, or a regular | |
7124 | expression matching the full file name: | |
7125 | B<f> I</home/me/foo.pl> and B<f> I<oo\\.> may access the same file. | |
7126 | Evals (with saved bodies) are considered to be filenames: | |
7127 | B<f> I<(eval 7)> and B<f> I<eval 7\\b> access the body of the 7th eval | |
7128 | (in the order of execution). | |
7129 | B</>I<pattern>B</> Search forwards for I<pattern>; final B</> is optional. | |
7130 | B<?>I<pattern>B<?> Search backwards for I<pattern>; final B<?> is optional. | |
7131 | B<L> [I<a|b|w>] List actions and or breakpoints and or watch-expressions. | |
7132 | B<S> [[B<!>]I<pattern>] List subroutine names [not] matching I<pattern>. | |
7133 | B<t> Toggle trace mode. | |
7134 | B<t> I<expr> Trace through execution of I<expr>. | |
7135 | B<b> Sets breakpoint on current line) | |
d12a4851 | 7136 | B<b> [I<line>] [I<condition>] |
69893cff RGS |
7137 | Set breakpoint; I<line> defaults to the current execution line; |
7138 | I<condition> breaks if it evaluates to true, defaults to '1'. | |
d12a4851 | 7139 | B<b> I<subname> [I<condition>] |
69893cff RGS |
7140 | Set breakpoint at first line of subroutine. |
7141 | B<b> I<\$var> Set breakpoint at first line of subroutine referenced by I<\$var>. | |
d12a4851 JH |
7142 | B<b> B<load> I<filename> Set breakpoint on 'require'ing the given file. |
7143 | B<b> B<postpone> I<subname> [I<condition>] | |
69893cff RGS |
7144 | Set breakpoint at first line of subroutine after |
7145 | it is compiled. | |
d12a4851 | 7146 | B<b> B<compile> I<subname> |
69893cff RGS |
7147 | Stop after the subroutine is compiled. |
7148 | B<B> [I<line>] Delete the breakpoint for I<line>. | |
d12a4851 JH |
7149 | B<B> I<*> Delete all breakpoints. |
7150 | B<a> [I<line>] I<command> | |
69893cff RGS |
7151 | Set an action to be done before the I<line> is executed; |
7152 | I<line> defaults to the current execution line. | |
7153 | Sequence is: check for breakpoint/watchpoint, print line | |
7154 | if necessary, do action, prompt user if necessary, | |
7155 | execute line. | |
7156 | B<a> Does nothing | |
7157 | B<A> [I<line>] Delete the action for I<line>. | |
d12a4851 | 7158 | B<A> I<*> Delete all actions. |
69893cff RGS |
7159 | B<w> I<expr> Add a global watch-expression. |
7160 | B<w> Does nothing | |
7161 | B<W> I<expr> Delete a global watch-expression. | |
d12a4851 | 7162 | B<W> I<*> Delete all watch-expressions. |
69893cff RGS |
7163 | B<V> [I<pkg> [I<vars>]] List some (default all) variables in package (default current). |
7164 | Use B<~>I<pattern> and B<!>I<pattern> for positive and negative regexps. | |
7165 | B<X> [I<vars>] Same as \"B<V> I<currentpackage> [I<vars>]\". | |
69893cff RGS |
7166 | B<x> I<expr> Evals expression in list context, dumps the result. |
7167 | B<m> I<expr> Evals expression in list context, prints methods callable | |
7168 | on the first element of the result. | |
7169 | B<m> I<class> Prints methods callable via the given class. | |
7170 | B<M> Show versions of loaded modules. | |
e219e2fb | 7171 | B<i> I<class> Prints nested parents of given class. |
2cbb2ee1 RGS |
7172 | B<e> Display current thread id. |
7173 | B<E> Display all thread ids the current one will be identified: <n>. | |
e22ea7cc | 7174 | B<y> [I<n> [I<Vars>]] List lexicals in higher scope <n>. Vars same as B<V>. |
69893cff RGS |
7175 | |
7176 | B<<> ? List Perl commands to run before each prompt. | |
7177 | B<<> I<expr> Define Perl command to run before each prompt. | |
7178 | B<<<> I<expr> Add to the list of Perl commands to run before each prompt. | |
e22ea7cc | 7179 | B<< *> Delete the list of perl commands to run before each prompt. |
69893cff RGS |
7180 | B<>> ? List Perl commands to run after each prompt. |
7181 | B<>> I<expr> Define Perl command to run after each prompt. | |
7182 | B<>>B<>> I<expr> Add to the list of Perl commands to run after each prompt. | |
e22ea7cc | 7183 | B<>>B< *> Delete the list of Perl commands to run after each prompt. |
69893cff RGS |
7184 | B<{> I<db_command> Define debugger command to run before each prompt. |
7185 | B<{> ? List debugger commands to run before each prompt. | |
7186 | B<{{> I<db_command> Add to the list of debugger commands to run before each prompt. | |
7187 | B<{ *> Delete the list of debugger commands to run before each prompt. | |
7188 | B<$prc> I<number> Redo a previous command (default previous command). | |
7189 | B<$prc> I<-number> Redo number'th-to-last command. | |
7190 | B<$prc> I<pattern> Redo last command that started with I<pattern>. | |
7191 | See 'B<O> I<recallCommand>' too. | |
7192 | B<$psh$psh> I<cmd> Run cmd in a subprocess (reads from DB::IN, writes to DB::OUT)" | |
e22ea7cc RF |
7193 | . ( |
7194 | $rc eq $sh | |
7195 | ? "" | |
7196 | : " | |
7197 | B<$psh> [I<cmd>] Run I<cmd> in subshell (forces \"\$SHELL -c 'cmd'\")." | |
7198 | ) . " | |
69893cff | 7199 | See 'B<O> I<shellBang>' too. |
7fddc82f | 7200 | B<source> I<file> Execute I<file> containing debugger commands (may nest). |
e219e2fb | 7201 | B<save> I<file> Save current debugger session (actual history) to I<file>. |
7fddc82f RF |
7202 | B<rerun> Rerun session to current position. |
7203 | B<rerun> I<n> Rerun session to numbered command. | |
7204 | B<rerun> I<-n> Rerun session to number'th-to-last command. | |
69893cff | 7205 | B<H> I<-number> Display last number commands (default all). |
e22ea7cc | 7206 | B<H> I<*> Delete complete history. |
69893cff RGS |
7207 | B<p> I<expr> Same as \"I<print {DB::OUT} expr>\" in current package. |
7208 | B<|>I<dbcmd> Run debugger command, piping DB::OUT to current pager. | |
7209 | B<||>I<dbcmd> Same as B<|>I<dbcmd> but DB::OUT is temporarilly select()ed as well. | |
7210 | B<\=> [I<alias> I<value>] Define a command alias, or list current aliases. | |
7211 | I<command> Execute as a perl statement in current package. | |
7212 | B<R> Pure-man-restart of debugger, some of debugger state | |
7213 | and command-line options may be lost. | |
7214 | Currently the following settings are preserved: | |
7215 | history, breakpoints and actions, debugger B<O>ptions | |
7216 | and the following command-line options: I<-w>, I<-I>, I<-e>. | |
7217 | ||
7218 | B<o> [I<opt>] ... Set boolean option to true | |
7219 | B<o> [I<opt>B<?>] Query options | |
d12a4851 | 7220 | B<o> [I<opt>B<=>I<val>] [I<opt>=B<\">I<val>B<\">] ... |
5561b870 | 7221 | Set options. Use quotes if spaces in value. |
69893cff RGS |
7222 | I<recallCommand>, I<ShellBang> chars used to recall command or spawn shell; |
7223 | I<pager> program for output of \"|cmd\"; | |
7224 | I<tkRunning> run Tk while prompting (with ReadLine); | |
7225 | I<signalLevel> I<warnLevel> I<dieLevel> level of verbosity; | |
7226 | I<inhibit_exit> Allows stepping off the end of the script. | |
7227 | I<ImmediateStop> Debugger should stop as early as possible. | |
7228 | I<RemotePort> Remote hostname:port for remote debugging | |
d12a4851 | 7229 | The following options affect what happens with B<V>, B<X>, and B<x> commands: |
69893cff RGS |
7230 | I<arrayDepth>, I<hashDepth> print only first N elements ('' for all); |
7231 | I<compactDump>, I<veryCompact> change style of array and hash dump; | |
7232 | I<globPrint> whether to print contents of globs; | |
7233 | I<DumpDBFiles> dump arrays holding debugged files; | |
7234 | I<DumpPackages> dump symbol tables of packages; | |
7235 | I<DumpReused> dump contents of \"reused\" addresses; | |
7236 | I<quote>, I<HighBit>, I<undefPrint> change style of string dump; | |
7237 | I<bareStringify> Do not print the overload-stringified value; | |
d12a4851 | 7238 | Other options include: |
69893cff RGS |
7239 | I<PrintRet> affects printing of return value after B<r> command, |
7240 | I<frame> affects printing messages on subroutine entry/exit. | |
7241 | I<AutoTrace> affects printing messages on possible breaking points. | |
7242 | I<maxTraceLen> gives max length of evals/args listed in stack trace. | |
7243 | I<ornaments> affects screen appearance of the command line. | |
7244 | I<CreateTTY> bits control attempts to create a new TTY on events: | |
7245 | 1: on fork() 2: debugger is started inside debugger | |
7246 | 4: on startup | |
7247 | During startup options are initialized from \$ENV{PERLDB_OPTS}. | |
7248 | You can put additional initialization options I<TTY>, I<noTTY>, | |
7249 | I<ReadLine>, I<NonStop>, and I<RemotePort> there (or use | |
7250 | `B<R>' after you set them). | |
7251 | ||
7252 | B<q> or B<^D> Quit. Set B<\$DB::finished = 0> to debug global destruction. | |
7253 | B<h> Summary of debugger commands. | |
7254 | B<h> [I<db_command>] Get help [on a specific debugger command], enter B<|h> to page. | |
7255 | B<h h> Long help for debugger commands | |
7256 | B<$doccmd> I<manpage> Runs the external doc viewer B<$doccmd> command on the | |
7257 | named Perl I<manpage>, or on B<$doccmd> itself if omitted. | |
7258 | Set B<\$DB::doccmd> to change viewer. | |
eda6e075 | 7259 | |
d12a4851 | 7260 | Type `|h h' for a paged display if this was too hard to read. |
eda6e075 | 7261 | |
e22ea7cc | 7262 | "; # Fix balance of vi % matching: }}}} |
eda6e075 | 7263 | |
d12a4851 JH |
7264 | # note: tabs in the following section are not-so-helpful |
7265 | $summary = <<"END_SUM"; | |
7266 | I<List/search source lines:> I<Control script execution:> | |
7267 | B<l> [I<ln>|I<sub>] List source code B<T> Stack trace | |
7268 | B<-> or B<.> List previous/current line B<s> [I<expr>] Single step [in expr] | |
7269 | B<v> [I<line>] View around line B<n> [I<expr>] Next, steps over subs | |
7270 | B<f> I<filename> View source in file <B<CR>/B<Enter>> Repeat last B<n> or B<s> | |
7271 | B</>I<pattern>B</> B<?>I<patt>B<?> Search forw/backw B<r> Return from subroutine | |
7272 | B<M> Show module versions B<c> [I<ln>|I<sub>] Continue until position | |
7273 | I<Debugger controls:> B<L> List break/watch/actions | |
7274 | B<o> [...] Set debugger options B<t> [I<expr>] Toggle trace [trace expr] | |
7275 | B<<>[B<<>]|B<{>[B<{>]|B<>>[B<>>] [I<cmd>] Do pre/post-prompt B<b> [I<ln>|I<event>|I<sub>] [I<cnd>] Set breakpoint | |
7276 | B<$prc> [I<N>|I<pat>] Redo a previous command B<B> I<ln|*> Delete a/all breakpoints | |
7277 | B<H> [I<-num>] Display last num commands B<a> [I<ln>] I<cmd> Do cmd before line | |
7278 | B<=> [I<a> I<val>] Define/list an alias B<A> I<ln|*> Delete a/all actions | |
7279 | B<h> [I<db_cmd>] Get help on command B<w> I<expr> Add a watch expression | |
7280 | B<h h> Complete help page B<W> I<expr|*> Delete a/all watch exprs | |
7281 | B<|>[B<|>]I<db_cmd> Send output to pager B<$psh>\[B<$psh>\] I<syscmd> Run cmd in a subprocess | |
7282 | B<q> or B<^D> Quit B<R> Attempt a restart | |
7283 | I<Data Examination:> B<expr> Execute perl code, also see: B<s>,B<n>,B<t> I<expr> | |
7284 | B<x>|B<m> I<expr> Evals expr in list context, dumps the result or lists methods. | |
7285 | B<p> I<expr> Print expression (uses script's current package). | |
7286 | B<S> [[B<!>]I<pat>] List subroutine names [not] matching pattern | |
7287 | B<V> [I<Pk> [I<Vars>]] List Variables in Package. Vars can be ~pattern or !pattern. | |
e219e2fb | 7288 | B<X> [I<Vars>] Same as \"B<V> I<current_package> [I<Vars>]\". B<i> I<class> inheritance tree. |
d12a4851 | 7289 | B<y> [I<n> [I<Vars>]] List lexicals in higher scope <n>. Vars same as B<V>. |
2cbb2ee1 | 7290 | B<e> Display thread id B<E> Display all thread ids. |
d12a4851 JH |
7291 | For more help, type B<h> I<cmd_letter>, or run B<$doccmd perldebug> for all docs. |
7292 | END_SUM | |
e22ea7cc | 7293 | |
69893cff RGS |
7294 | # ')}}; # Fix balance of vi % matching |
7295 | ||
7296 | # and this is really numb... | |
7297 | $pre580_help = " | |
7298 | B<T> Stack trace. | |
7299 | B<s> [I<expr>] Single step [in I<expr>]. | |
7300 | B<n> [I<expr>] Next, steps over subroutine calls [in I<expr>]. | |
e22ea7cc | 7301 | B<CR>> Repeat last B<n> or B<s> command. |
69893cff RGS |
7302 | B<r> Return from current subroutine. |
7303 | B<c> [I<line>|I<sub>] Continue; optionally inserts a one-time-only breakpoint | |
7304 | at the specified position. | |
7305 | B<l> I<min>B<+>I<incr> List I<incr>+1 lines starting at I<min>. | |
7306 | B<l> I<min>B<->I<max> List lines I<min> through I<max>. | |
7307 | B<l> I<line> List single I<line>. | |
7308 | B<l> I<subname> List first window of lines from subroutine. | |
7309 | B<l> I<\$var> List first window of lines from subroutine referenced by I<\$var>. | |
7310 | B<l> List next window of lines. | |
7311 | B<-> List previous window of lines. | |
7312 | B<w> [I<line>] List window around I<line>. | |
7313 | B<.> Return to the executed line. | |
7314 | B<f> I<filename> Switch to viewing I<filename>. File must be already loaded. | |
7315 | I<filename> may be either the full name of the file, or a regular | |
7316 | expression matching the full file name: | |
7317 | B<f> I</home/me/foo.pl> and B<f> I<oo\\.> may access the same file. | |
7318 | Evals (with saved bodies) are considered to be filenames: | |
7319 | B<f> I<(eval 7)> and B<f> I<eval 7\\b> access the body of the 7th eval | |
7320 | (in the order of execution). | |
7321 | B</>I<pattern>B</> Search forwards for I<pattern>; final B</> is optional. | |
7322 | B<?>I<pattern>B<?> Search backwards for I<pattern>; final B<?> is optional. | |
7323 | B<L> List all breakpoints and actions. | |
7324 | B<S> [[B<!>]I<pattern>] List subroutine names [not] matching I<pattern>. | |
7325 | B<t> Toggle trace mode. | |
7326 | B<t> I<expr> Trace through execution of I<expr>. | |
d12a4851 | 7327 | B<b> [I<line>] [I<condition>] |
69893cff RGS |
7328 | Set breakpoint; I<line> defaults to the current execution line; |
7329 | I<condition> breaks if it evaluates to true, defaults to '1'. | |
d12a4851 | 7330 | B<b> I<subname> [I<condition>] |
69893cff RGS |
7331 | Set breakpoint at first line of subroutine. |
7332 | B<b> I<\$var> Set breakpoint at first line of subroutine referenced by I<\$var>. | |
d12a4851 JH |
7333 | B<b> B<load> I<filename> Set breakpoint on `require'ing the given file. |
7334 | B<b> B<postpone> I<subname> [I<condition>] | |
69893cff RGS |
7335 | Set breakpoint at first line of subroutine after |
7336 | it is compiled. | |
d12a4851 | 7337 | B<b> B<compile> I<subname> |
69893cff RGS |
7338 | Stop after the subroutine is compiled. |
7339 | B<d> [I<line>] Delete the breakpoint for I<line>. | |
7340 | B<D> Delete all breakpoints. | |
d12a4851 | 7341 | B<a> [I<line>] I<command> |
69893cff RGS |
7342 | Set an action to be done before the I<line> is executed; |
7343 | I<line> defaults to the current execution line. | |
7344 | Sequence is: check for breakpoint/watchpoint, print line | |
7345 | if necessary, do action, prompt user if necessary, | |
7346 | execute line. | |
7347 | B<a> [I<line>] Delete the action for I<line>. | |
7348 | B<A> Delete all actions. | |
7349 | B<W> I<expr> Add a global watch-expression. | |
7350 | B<W> Delete all watch-expressions. | |
7351 | B<V> [I<pkg> [I<vars>]] List some (default all) variables in package (default current). | |
7352 | Use B<~>I<pattern> and B<!>I<pattern> for positive and negative regexps. | |
7353 | B<X> [I<vars>] Same as \"B<V> I<currentpackage> [I<vars>]\". | |
7354 | B<x> I<expr> Evals expression in list context, dumps the result. | |
7355 | B<m> I<expr> Evals expression in list context, prints methods callable | |
7356 | on the first element of the result. | |
7357 | B<m> I<class> Prints methods callable via the given class. | |
7358 | ||
7359 | B<<> ? List Perl commands to run before each prompt. | |
7360 | B<<> I<expr> Define Perl command to run before each prompt. | |
7361 | B<<<> I<expr> Add to the list of Perl commands to run before each prompt. | |
7362 | B<>> ? List Perl commands to run after each prompt. | |
7363 | B<>> I<expr> Define Perl command to run after each prompt. | |
7364 | B<>>B<>> I<expr> Add to the list of Perl commands to run after each prompt. | |
7365 | B<{> I<db_command> Define debugger command to run before each prompt. | |
7366 | B<{> ? List debugger commands to run before each prompt. | |
7367 | B<{{> I<db_command> Add to the list of debugger commands to run before each prompt. | |
7368 | B<$prc> I<number> Redo a previous command (default previous command). | |
7369 | B<$prc> I<-number> Redo number'th-to-last command. | |
7370 | B<$prc> I<pattern> Redo last command that started with I<pattern>. | |
7371 | See 'B<O> I<recallCommand>' too. | |
7372 | B<$psh$psh> I<cmd> Run cmd in a subprocess (reads from DB::IN, writes to DB::OUT)" | |
e22ea7cc RF |
7373 | . ( |
7374 | $rc eq $sh | |
7375 | ? "" | |
7376 | : " | |
69893cff | 7377 | B<$psh> [I<cmd>] Run I<cmd> in subshell (forces \"\$SHELL -c 'cmd'\")." |
e22ea7cc | 7378 | ) . " |
69893cff RGS |
7379 | See 'B<O> I<shellBang>' too. |
7380 | B<source> I<file> Execute I<file> containing debugger commands (may nest). | |
7381 | B<H> I<-number> Display last number commands (default all). | |
7382 | B<p> I<expr> Same as \"I<print {DB::OUT} expr>\" in current package. | |
7383 | B<|>I<dbcmd> Run debugger command, piping DB::OUT to current pager. | |
7384 | B<||>I<dbcmd> Same as B<|>I<dbcmd> but DB::OUT is temporarilly select()ed as well. | |
7385 | B<\=> [I<alias> I<value>] Define a command alias, or list current aliases. | |
7386 | I<command> Execute as a perl statement in current package. | |
7387 | B<v> Show versions of loaded modules. | |
7388 | B<R> Pure-man-restart of debugger, some of debugger state | |
7389 | and command-line options may be lost. | |
7390 | Currently the following settings are preserved: | |
7391 | history, breakpoints and actions, debugger B<O>ptions | |
7392 | and the following command-line options: I<-w>, I<-I>, I<-e>. | |
7393 | ||
7394 | B<O> [I<opt>] ... Set boolean option to true | |
7395 | B<O> [I<opt>B<?>] Query options | |
d12a4851 | 7396 | B<O> [I<opt>B<=>I<val>] [I<opt>=B<\">I<val>B<\">] ... |
5561b870 | 7397 | Set options. Use quotes if spaces in value. |
69893cff RGS |
7398 | I<recallCommand>, I<ShellBang> chars used to recall command or spawn shell; |
7399 | I<pager> program for output of \"|cmd\"; | |
7400 | I<tkRunning> run Tk while prompting (with ReadLine); | |
7401 | I<signalLevel> I<warnLevel> I<dieLevel> level of verbosity; | |
7402 | I<inhibit_exit> Allows stepping off the end of the script. | |
7403 | I<ImmediateStop> Debugger should stop as early as possible. | |
7404 | I<RemotePort> Remote hostname:port for remote debugging | |
d12a4851 | 7405 | The following options affect what happens with B<V>, B<X>, and B<x> commands: |
69893cff RGS |
7406 | I<arrayDepth>, I<hashDepth> print only first N elements ('' for all); |
7407 | I<compactDump>, I<veryCompact> change style of array and hash dump; | |
7408 | I<globPrint> whether to print contents of globs; | |
7409 | I<DumpDBFiles> dump arrays holding debugged files; | |
7410 | I<DumpPackages> dump symbol tables of packages; | |
7411 | I<DumpReused> dump contents of \"reused\" addresses; | |
7412 | I<quote>, I<HighBit>, I<undefPrint> change style of string dump; | |
7413 | I<bareStringify> Do not print the overload-stringified value; | |
d12a4851 | 7414 | Other options include: |
69893cff RGS |
7415 | I<PrintRet> affects printing of return value after B<r> command, |
7416 | I<frame> affects printing messages on subroutine entry/exit. | |
7417 | I<AutoTrace> affects printing messages on possible breaking points. | |
7418 | I<maxTraceLen> gives max length of evals/args listed in stack trace. | |
7419 | I<ornaments> affects screen appearance of the command line. | |
7420 | I<CreateTTY> bits control attempts to create a new TTY on events: | |
7421 | 1: on fork() 2: debugger is started inside debugger | |
7422 | 4: on startup | |
7423 | During startup options are initialized from \$ENV{PERLDB_OPTS}. | |
7424 | You can put additional initialization options I<TTY>, I<noTTY>, | |
7425 | I<ReadLine>, I<NonStop>, and I<RemotePort> there (or use | |
7426 | `B<R>' after you set them). | |
7427 | ||
7428 | B<q> or B<^D> Quit. Set B<\$DB::finished = 0> to debug global destruction. | |
7429 | B<h> [I<db_command>] Get help [on a specific debugger command], enter B<|h> to page. | |
7430 | B<h h> Summary of debugger commands. | |
7431 | B<$doccmd> I<manpage> Runs the external doc viewer B<$doccmd> command on the | |
7432 | named Perl I<manpage>, or on B<$doccmd> itself if omitted. | |
7433 | Set B<\$DB::doccmd> to change viewer. | |
eda6e075 | 7434 | |
d12a4851 | 7435 | Type `|h' for a paged display if this was too hard to read. |
3a6edaec | 7436 | |
e22ea7cc | 7437 | "; # Fix balance of vi % matching: }}}} |
eda6e075 | 7438 | |
d12a4851 JH |
7439 | # note: tabs in the following section are not-so-helpful |
7440 | $pre580_summary = <<"END_SUM"; | |
7441 | I<List/search source lines:> I<Control script execution:> | |
7442 | B<l> [I<ln>|I<sub>] List source code B<T> Stack trace | |
7443 | B<-> or B<.> List previous/current line B<s> [I<expr>] Single step [in expr] | |
7444 | B<w> [I<line>] List around line B<n> [I<expr>] Next, steps over subs | |
7445 | B<f> I<filename> View source in file <B<CR>/B<Enter>> Repeat last B<n> or B<s> | |
7446 | B</>I<pattern>B</> B<?>I<patt>B<?> Search forw/backw B<r> Return from subroutine | |
7447 | B<v> Show versions of modules B<c> [I<ln>|I<sub>] Continue until position | |
7448 | I<Debugger controls:> B<L> List break/watch/actions | |
7449 | B<O> [...] Set debugger options B<t> [I<expr>] Toggle trace [trace expr] | |
7450 | B<<>[B<<>]|B<{>[B<{>]|B<>>[B<>>] [I<cmd>] Do pre/post-prompt B<b> [I<ln>|I<event>|I<sub>] [I<cnd>] Set breakpoint | |
7451 | B<$prc> [I<N>|I<pat>] Redo a previous command B<d> [I<ln>] or B<D> Delete a/all breakpoints | |
7452 | B<H> [I<-num>] Display last num commands B<a> [I<ln>] I<cmd> Do cmd before line | |
7453 | B<=> [I<a> I<val>] Define/list an alias B<W> I<expr> Add a watch expression | |
7454 | B<h> [I<db_cmd>] Get help on command B<A> or B<W> Delete all actions/watch | |
7455 | B<|>[B<|>]I<db_cmd> Send output to pager B<$psh>\[B<$psh>\] I<syscmd> Run cmd in a subprocess | |
7456 | B<q> or B<^D> Quit B<R> Attempt a restart | |
7457 | I<Data Examination:> B<expr> Execute perl code, also see: B<s>,B<n>,B<t> I<expr> | |
7458 | B<x>|B<m> I<expr> Evals expr in list context, dumps the result or lists methods. | |
7459 | B<p> I<expr> Print expression (uses script's current package). | |
7460 | B<S> [[B<!>]I<pat>] List subroutine names [not] matching pattern | |
7461 | B<V> [I<Pk> [I<Vars>]] List Variables in Package. Vars can be ~pattern or !pattern. | |
7462 | B<X> [I<Vars>] Same as \"B<V> I<current_package> [I<Vars>]\". | |
7463 | B<y> [I<n> [I<Vars>]] List lexicals in higher scope <n>. Vars same as B<V>. | |
7464 | For more help, type B<h> I<cmd_letter>, or run B<$doccmd perldebug> for all docs. | |
7465 | END_SUM | |
eda6e075 | 7466 | |
e22ea7cc | 7467 | # ')}}; # Fix balance of vi % matching |
69893cff RGS |
7468 | |
7469 | } ## end sub sethelp | |
7470 | ||
7471 | =head2 C<print_help()> | |
7472 | ||
7473 | Most of what C<print_help> does is just text formatting. It finds the | |
7474 | C<B> and C<I> ornaments, cleans them off, and substitutes the proper | |
7475 | terminal control characters to simulate them (courtesy of | |
be9a9b1d | 7476 | C<Term::ReadLine::TermCap>). |
69893cff RGS |
7477 | |
7478 | =cut | |
eda6e075 | 7479 | |
d12a4851 JH |
7480 | sub print_help { |
7481 | local $_ = shift; | |
eda6e075 | 7482 | |
d12a4851 JH |
7483 | # Restore proper alignment destroyed by eeevil I<> and B<> |
7484 | # ornaments: A pox on both their houses! | |
7485 | # | |
7486 | # A help command will have everything up to and including | |
7487 | # the first tab sequence padded into a field 16 (or if indented 20) | |
7488 | # wide. If it's wider than that, an extra space will be added. | |
7489 | s{ | |
e22ea7cc RF |
7490 | ^ # only matters at start of line |
7491 | ( \040{4} | \t )* # some subcommands are indented | |
7492 | ( < ? # so <CR> works | |
7493 | [BI] < [^\t\n] + ) # find an eeevil ornament | |
7494 | ( \t+ ) # original separation, discarded | |
7495 | ( .* ) # this will now start (no earlier) than | |
7496 | # column 16 | |
d12a4851 | 7497 | } { |
e22ea7cc RF |
7498 | my($leadwhite, $command, $midwhite, $text) = ($1, $2, $3, $4); |
7499 | my $clean = $command; | |
7500 | $clean =~ s/[BI]<([^>]*)>/$1/g; | |
69893cff | 7501 | |
e22ea7cc RF |
7502 | # replace with this whole string: |
7503 | ($leadwhite ? " " x 4 : "") | |
d12a4851 JH |
7504 | . $command |
7505 | . ((" " x (16 + ($leadwhite ? 4 : 0) - length($clean))) || " ") | |
7506 | . $text; | |
eda6e075 | 7507 | |
d12a4851 | 7508 | }mgex; |
eda6e075 | 7509 | |
e22ea7cc RF |
7510 | s{ # handle bold ornaments |
7511 | B < ( [^>] + | > ) > | |
d12a4851 | 7512 | } { |
e22ea7cc RF |
7513 | $Term::ReadLine::TermCap::rl_term_set[2] |
7514 | . $1 | |
7515 | . $Term::ReadLine::TermCap::rl_term_set[3] | |
d12a4851 | 7516 | }gex; |
eda6e075 | 7517 | |
e22ea7cc RF |
7518 | s{ # handle italic ornaments |
7519 | I < ( [^>] + | > ) > | |
d12a4851 | 7520 | } { |
e22ea7cc RF |
7521 | $Term::ReadLine::TermCap::rl_term_set[0] |
7522 | . $1 | |
7523 | . $Term::ReadLine::TermCap::rl_term_set[1] | |
d12a4851 | 7524 | }gex; |
eda6e075 | 7525 | |
d12a4851 JH |
7526 | local $\ = ''; |
7527 | print $OUT $_; | |
69893cff RGS |
7528 | } ## end sub print_help |
7529 | ||
7530 | =head2 C<fix_less> | |
7531 | ||
7532 | This routine does a lot of gyrations to be sure that the pager is C<less>. | |
7533 | It checks for C<less> masquerading as C<more> and records the result in | |
7534 | C<$ENV{LESS}> so we don't have to go through doing the stats again. | |
7535 | ||
7536 | =cut | |
eda6e075 | 7537 | |
d12a4851 | 7538 | sub fix_less { |
69893cff RGS |
7539 | |
7540 | # We already know if this is set. | |
d12a4851 | 7541 | return if defined $ENV{LESS} && $ENV{LESS} =~ /r/; |
69893cff RGS |
7542 | |
7543 | # Pager is less for sure. | |
d12a4851 | 7544 | my $is_less = $pager =~ /\bless\b/; |
e22ea7cc RF |
7545 | if ( $pager =~ /\bmore\b/ ) { |
7546 | ||
69893cff | 7547 | # Nope, set to more. See what's out there. |
e22ea7cc RF |
7548 | my @st_more = stat('/usr/bin/more'); |
7549 | my @st_less = stat('/usr/bin/less'); | |
69893cff RGS |
7550 | |
7551 | # is it really less, pretending to be more? | |
e22ea7cc RF |
7552 | $is_less = @st_more |
7553 | && @st_less | |
7554 | && $st_more[0] == $st_less[0] | |
7555 | && $st_more[1] == $st_less[1]; | |
69893cff | 7556 | } ## end if ($pager =~ /\bmore\b/) |
e22ea7cc | 7557 | |
d12a4851 | 7558 | # changes environment! |
69893cff | 7559 | # 'r' added so we don't do (slow) stats again. |
e22ea7cc | 7560 | $ENV{LESS} .= 'r' if $is_less; |
69893cff RGS |
7561 | } ## end sub fix_less |
7562 | ||
7563 | =head1 DIE AND WARN MANAGEMENT | |
7564 | ||
7565 | =head2 C<diesignal> | |
7566 | ||
7567 | C<diesignal> is a just-drop-dead C<die> handler. It's most useful when trying | |
7568 | to debug a debugger problem. | |
7569 | ||
7570 | It does its best to report the error that occurred, and then forces the | |
7571 | program, debugger, and everything to die. | |
7572 | ||
7573 | =cut | |
eda6e075 | 7574 | |
d12a4851 | 7575 | sub diesignal { |
e22ea7cc | 7576 | |
69893cff | 7577 | # No entry/exit messages. |
d12a4851 | 7578 | local $frame = 0; |
69893cff RGS |
7579 | |
7580 | # No return value prints. | |
d12a4851 | 7581 | local $doret = -2; |
69893cff RGS |
7582 | |
7583 | # set the abort signal handling to the default (just terminate). | |
d12a4851 | 7584 | $SIG{'ABRT'} = 'DEFAULT'; |
69893cff RGS |
7585 | |
7586 | # If we enter the signal handler recursively, kill myself with an | |
7587 | # abort signal (so we just terminate). | |
d12a4851 | 7588 | kill 'ABRT', $$ if $panic++; |
69893cff RGS |
7589 | |
7590 | # If we can show detailed info, do so. | |
e22ea7cc RF |
7591 | if ( defined &Carp::longmess ) { |
7592 | ||
69893cff | 7593 | # Don't recursively enter the warn handler, since we're carping. |
e22ea7cc | 7594 | local $SIG{__WARN__} = ''; |
69893cff | 7595 | |
e22ea7cc RF |
7596 | # Skip two levels before reporting traceback: we're skipping |
7597 | # mydie and confess. | |
7598 | local $Carp::CarpLevel = 2; # mydie + confess | |
69893cff RGS |
7599 | |
7600 | # Tell us all about it. | |
e22ea7cc | 7601 | &warn( Carp::longmess("Signal @_") ); |
d12a4851 | 7602 | } |
69893cff RGS |
7603 | |
7604 | # No Carp. Tell us about the signal as best we can. | |
d12a4851 | 7605 | else { |
69893cff RGS |
7606 | local $\ = ''; |
7607 | print $DB::OUT "Got signal @_\n"; | |
d12a4851 | 7608 | } |
69893cff RGS |
7609 | |
7610 | # Drop dead. | |
d12a4851 | 7611 | kill 'ABRT', $$; |
69893cff RGS |
7612 | } ## end sub diesignal |
7613 | ||
7614 | =head2 C<dbwarn> | |
7615 | ||
7616 | The debugger's own default C<$SIG{__WARN__}> handler. We load C<Carp> to | |
7617 | be able to get a stack trace, and output the warning message vi C<DB::dbwarn()>. | |
7618 | ||
7619 | =cut | |
7620 | ||
e22ea7cc | 7621 | sub dbwarn { |
eda6e075 | 7622 | |
e22ea7cc RF |
7623 | # No entry/exit trace. |
7624 | local $frame = 0; | |
69893cff RGS |
7625 | |
7626 | # No return value printing. | |
e22ea7cc | 7627 | local $doret = -2; |
69893cff RGS |
7628 | |
7629 | # Turn off warn and die handling to prevent recursive entries to this | |
7630 | # routine. | |
e22ea7cc RF |
7631 | local $SIG{__WARN__} = ''; |
7632 | local $SIG{__DIE__} = ''; | |
69893cff RGS |
7633 | |
7634 | # Load Carp if we can. If $^S is false (current thing being compiled isn't | |
7635 | # done yet), we may not be able to do a require. | |
e22ea7cc RF |
7636 | eval { require Carp } |
7637 | if defined $^S; # If error/warning during compilation, | |
7638 | # require may be broken. | |
69893cff RGS |
7639 | |
7640 | # Use the core warn() unless Carp loaded OK. | |
e22ea7cc RF |
7641 | CORE::warn( @_, |
7642 | "\nCannot print stack trace, load with -MCarp option to see stack" ), | |
7643 | return | |
7644 | unless defined &Carp::longmess; | |
69893cff RGS |
7645 | |
7646 | # Save the current values of $single and $trace, and then turn them off. | |
e22ea7cc RF |
7647 | my ( $mysingle, $mytrace ) = ( $single, $trace ); |
7648 | $single = 0; | |
7649 | $trace = 0; | |
69893cff | 7650 | |
e22ea7cc | 7651 | # We can call Carp::longmess without its being "debugged" (which we |
69893cff | 7652 | # don't want - we just want to use it!). Capture this for later. |
e22ea7cc | 7653 | my $mess = Carp::longmess(@_); |
69893cff RGS |
7654 | |
7655 | # Restore $single and $trace to their original values. | |
e22ea7cc | 7656 | ( $single, $trace ) = ( $mysingle, $mytrace ); |
69893cff RGS |
7657 | |
7658 | # Use the debugger's own special way of printing warnings to print | |
7659 | # the stack trace message. | |
e22ea7cc | 7660 | &warn($mess); |
69893cff RGS |
7661 | } ## end sub dbwarn |
7662 | ||
7663 | =head2 C<dbdie> | |
7664 | ||
7665 | The debugger's own C<$SIG{__DIE__}> handler. Handles providing a stack trace | |
7666 | by loading C<Carp> and calling C<Carp::longmess()> to get it. We turn off | |
7667 | single stepping and tracing during the call to C<Carp::longmess> to avoid | |
7668 | debugging it - we just want to use it. | |
7669 | ||
7670 | If C<dieLevel> is zero, we let the program being debugged handle the | |
7671 | exceptions. If it's 1, you get backtraces for any exception. If it's 2, | |
7672 | the debugger takes over all exception handling, printing a backtrace and | |
7673 | displaying the exception via its C<dbwarn()> routine. | |
7674 | ||
7675 | =cut | |
7676 | ||
d12a4851 | 7677 | sub dbdie { |
e22ea7cc RF |
7678 | local $frame = 0; |
7679 | local $doret = -2; | |
7680 | local $SIG{__DIE__} = ''; | |
7681 | local $SIG{__WARN__} = ''; | |
7682 | my $i = 0; | |
7683 | my $ineval = 0; | |
7684 | my $sub; | |
7685 | if ( $dieLevel > 2 ) { | |
7686 | local $SIG{__WARN__} = \&dbwarn; | |
7687 | &warn(@_); # Yell no matter what | |
7688 | return; | |
7689 | } | |
7690 | if ( $dieLevel < 2 ) { | |
7691 | die @_ if $^S; # in eval propagate | |
7692 | } | |
69893cff RGS |
7693 | |
7694 | # The code used to check $^S to see if compiliation of the current thing | |
7695 | # hadn't finished. We don't do it anymore, figuring eval is pretty stable. | |
e22ea7cc | 7696 | eval { require Carp }; |
d12a4851 | 7697 | |
e22ea7cc RF |
7698 | die( @_, |
7699 | "\nCannot print stack trace, load with -MCarp option to see stack" ) | |
7700 | unless defined &Carp::longmess; | |
d12a4851 | 7701 | |
69893cff RGS |
7702 | # We do not want to debug this chunk (automatic disabling works |
7703 | # inside DB::DB, but not in Carp). Save $single and $trace, turn them off, | |
7704 | # get the stack trace from Carp::longmess (if possible), restore $signal | |
7705 | # and $trace, and then die with the stack trace. | |
e22ea7cc RF |
7706 | my ( $mysingle, $mytrace ) = ( $single, $trace ); |
7707 | $single = 0; | |
7708 | $trace = 0; | |
7709 | my $mess = "@_"; | |
7710 | { | |
7711 | ||
7712 | package Carp; # Do not include us in the list | |
7713 | eval { $mess = Carp::longmess(@_); }; | |
7714 | } | |
7715 | ( $single, $trace ) = ( $mysingle, $mytrace ); | |
7716 | die $mess; | |
69893cff RGS |
7717 | } ## end sub dbdie |
7718 | ||
7719 | =head2 C<warnlevel()> | |
7720 | ||
7721 | Set the C<$DB::warnLevel> variable that stores the value of the | |
7722 | C<warnLevel> option. Calling C<warnLevel()> with a positive value | |
7723 | results in the debugger taking over all warning handlers. Setting | |
7724 | C<warnLevel> to zero leaves any warning handlers set up by the program | |
7725 | being debugged in place. | |
7726 | ||
7727 | =cut | |
eda6e075 | 7728 | |
d12a4851 | 7729 | sub warnLevel { |
e22ea7cc RF |
7730 | if (@_) { |
7731 | $prevwarn = $SIG{__WARN__} unless $warnLevel; | |
7732 | $warnLevel = shift; | |
7733 | if ($warnLevel) { | |
7734 | $SIG{__WARN__} = \&DB::dbwarn; | |
7735 | } | |
7736 | elsif ($prevwarn) { | |
7737 | $SIG{__WARN__} = $prevwarn; | |
ea581a51 TM |
7738 | } else { |
7739 | undef $SIG{__WARN__}; | |
e22ea7cc | 7740 | } |
69893cff | 7741 | } ## end if (@_) |
e22ea7cc | 7742 | $warnLevel; |
69893cff RGS |
7743 | } ## end sub warnLevel |
7744 | ||
7745 | =head2 C<dielevel> | |
7746 | ||
7747 | Similar to C<warnLevel>. Non-zero values for C<dieLevel> result in the | |
7748 | C<DB::dbdie()> function overriding any other C<die()> handler. Setting it to | |
7749 | zero lets you use your own C<die()> handler. | |
7750 | ||
7751 | =cut | |
eda6e075 | 7752 | |
d12a4851 | 7753 | sub dieLevel { |
e22ea7cc RF |
7754 | local $\ = ''; |
7755 | if (@_) { | |
7756 | $prevdie = $SIG{__DIE__} unless $dieLevel; | |
7757 | $dieLevel = shift; | |
7758 | if ($dieLevel) { | |
7759 | ||
69893cff | 7760 | # Always set it to dbdie() for non-zero values. |
e22ea7cc | 7761 | $SIG{__DIE__} = \&DB::dbdie; # if $dieLevel < 2; |
69893cff | 7762 | |
e22ea7cc RF |
7763 | # No longer exists, so don't try to use it. |
7764 | #$SIG{__DIE__} = \&DB::diehard if $dieLevel >= 2; | |
69893cff RGS |
7765 | |
7766 | # If we've finished initialization, mention that stack dumps | |
7767 | # are enabled, If dieLevel is 1, we won't stack dump if we die | |
7768 | # in an eval(). | |
e22ea7cc RF |
7769 | print $OUT "Stack dump during die enabled", |
7770 | ( $dieLevel == 1 ? " outside of evals" : "" ), ".\n" | |
7771 | if $I_m_init; | |
69893cff RGS |
7772 | |
7773 | # XXX This is probably obsolete, given that diehard() is gone. | |
e22ea7cc | 7774 | print $OUT "Dump printed too.\n" if $dieLevel > 2; |
69893cff RGS |
7775 | } ## end if ($dieLevel) |
7776 | ||
7777 | # Put the old one back if there was one. | |
e22ea7cc RF |
7778 | elsif ($prevdie) { |
7779 | $SIG{__DIE__} = $prevdie; | |
7780 | print $OUT "Default die handler restored.\n"; | |
ea581a51 TM |
7781 | } else { |
7782 | undef $SIG{__DIE__}; | |
7783 | print $OUT "Die handler removed.\n"; | |
e22ea7cc | 7784 | } |
69893cff | 7785 | } ## end if (@_) |
e22ea7cc | 7786 | $dieLevel; |
69893cff RGS |
7787 | } ## end sub dieLevel |
7788 | ||
7789 | =head2 C<signalLevel> | |
7790 | ||
7791 | Number three in a series: set C<signalLevel> to zero to keep your own | |
7792 | signal handler for C<SIGSEGV> and/or C<SIGBUS>. Otherwise, the debugger | |
7793 | takes over and handles them with C<DB::diesignal()>. | |
7794 | ||
7795 | =cut | |
eda6e075 | 7796 | |
d12a4851 | 7797 | sub signalLevel { |
e22ea7cc RF |
7798 | if (@_) { |
7799 | $prevsegv = $SIG{SEGV} unless $signalLevel; | |
7800 | $prevbus = $SIG{BUS} unless $signalLevel; | |
7801 | $signalLevel = shift; | |
7802 | if ($signalLevel) { | |
7803 | $SIG{SEGV} = \&DB::diesignal; | |
7804 | $SIG{BUS} = \&DB::diesignal; | |
7805 | } | |
7806 | else { | |
7807 | $SIG{SEGV} = $prevsegv; | |
7808 | $SIG{BUS} = $prevbus; | |
7809 | } | |
69893cff | 7810 | } ## end if (@_) |
e22ea7cc | 7811 | $signalLevel; |
69893cff RGS |
7812 | } ## end sub signalLevel |
7813 | ||
7814 | =head1 SUBROUTINE DECODING SUPPORT | |
7815 | ||
7816 | These subroutines are used during the C<x> and C<X> commands to try to | |
7817 | produce as much information as possible about a code reference. They use | |
7818 | L<Devel::Peek> to try to find the glob in which this code reference lives | |
7819 | (if it does) - this allows us to actually code references which correspond | |
7820 | to named subroutines (including those aliased via glob assignment). | |
7821 | ||
7822 | =head2 C<CvGV_name()> | |
7823 | ||
be9a9b1d | 7824 | Wrapper for C<CvGV_name_or_bust>; tries to get the name of a reference |
69893cff | 7825 | via that routine. If this fails, return the reference again (when the |
be9a9b1d | 7826 | reference is stringified, it'll come out as C<SOMETHING(0x...)>). |
69893cff RGS |
7827 | |
7828 | =cut | |
eda6e075 | 7829 | |
d12a4851 | 7830 | sub CvGV_name { |
e22ea7cc RF |
7831 | my $in = shift; |
7832 | my $name = CvGV_name_or_bust($in); | |
7833 | defined $name ? $name : $in; | |
d12a4851 | 7834 | } |
eda6e075 | 7835 | |
69893cff RGS |
7836 | =head2 C<CvGV_name_or_bust> I<coderef> |
7837 | ||
7838 | Calls L<Devel::Peek> to try to find the glob the ref lives in; returns | |
7839 | C<undef> if L<Devel::Peek> can't be loaded, or if C<Devel::Peek::CvGV> can't | |
7840 | find a glob for this ref. | |
7841 | ||
be9a9b1d | 7842 | Returns C<< I<package>::I<glob name> >> if the code ref is found in a glob. |
69893cff RGS |
7843 | |
7844 | =cut | |
7845 | ||
d12a4851 | 7846 | sub CvGV_name_or_bust { |
e22ea7cc RF |
7847 | my $in = shift; |
7848 | return if $skipCvGV; # Backdoor to avoid problems if XS broken... | |
7849 | return unless ref $in; | |
7850 | $in = \&$in; # Hard reference... | |
7851 | eval { require Devel::Peek; 1 } or return; | |
7852 | my $gv = Devel::Peek::CvGV($in) or return; | |
7853 | *$gv{PACKAGE} . '::' . *$gv{NAME}; | |
69893cff RGS |
7854 | } ## end sub CvGV_name_or_bust |
7855 | ||
7856 | =head2 C<find_sub> | |
7857 | ||
7858 | A utility routine used in various places; finds the file where a subroutine | |
7859 | was defined, and returns that filename and a line-number range. | |
7860 | ||
be9a9b1d AT |
7861 | Tries to use C<@sub> first; if it can't find it there, it tries building a |
7862 | reference to the subroutine and uses C<CvGV_name_or_bust> to locate it, | |
7863 | loading it into C<@sub> as a side effect (XXX I think). If it can't find it | |
7864 | this way, it brute-force searches C<%sub>, checking for identical references. | |
69893cff RGS |
7865 | |
7866 | =cut | |
eda6e075 | 7867 | |
d12a4851 | 7868 | sub find_sub { |
e22ea7cc RF |
7869 | my $subr = shift; |
7870 | $sub{$subr} or do { | |
7871 | return unless defined &$subr; | |
7872 | my $name = CvGV_name_or_bust($subr); | |
7873 | my $data; | |
7874 | $data = $sub{$name} if defined $name; | |
7875 | return $data if defined $data; | |
7876 | ||
7877 | # Old stupid way... | |
7878 | $subr = \&$subr; # Hard reference | |
7879 | my $s; | |
7880 | for ( keys %sub ) { | |
7881 | $s = $_, last if $subr eq \&$_; | |
7882 | } | |
7883 | $sub{$s} if $s; | |
69893cff RGS |
7884 | } ## end do |
7885 | } ## end sub find_sub | |
7886 | ||
7887 | =head2 C<methods> | |
7888 | ||
be9a9b1d | 7889 | A subroutine that uses the utility function C<methods_via> to find all the |
69893cff RGS |
7890 | methods in the class corresponding to the current reference and in |
7891 | C<UNIVERSAL>. | |
7892 | ||
7893 | =cut | |
eda6e075 | 7894 | |
d12a4851 | 7895 | sub methods { |
69893cff RGS |
7896 | |
7897 | # Figure out the class - either this is the class or it's a reference | |
7898 | # to something blessed into that class. | |
e22ea7cc RF |
7899 | my $class = shift; |
7900 | $class = ref $class if ref $class; | |
69893cff | 7901 | |
e22ea7cc | 7902 | local %seen; |
69893cff RGS |
7903 | |
7904 | # Show the methods that this class has. | |
e22ea7cc RF |
7905 | methods_via( $class, '', 1 ); |
7906 | ||
7907 | # Show the methods that UNIVERSAL has. | |
7908 | methods_via( 'UNIVERSAL', 'UNIVERSAL', 0 ); | |
69893cff RGS |
7909 | } ## end sub methods |
7910 | ||
7911 | =head2 C<methods_via($class, $prefix, $crawl_upward)> | |
7912 | ||
7913 | C<methods_via> does the work of crawling up the C<@ISA> tree and reporting | |
7914 | all the parent class methods. C<$class> is the name of the next class to | |
7915 | try; C<$prefix> is the message prefix, which gets built up as we go up the | |
7916 | C<@ISA> tree to show parentage; C<$crawl_upward> is 1 if we should try to go | |
7917 | higher in the C<@ISA> tree, 0 if we should stop. | |
7918 | ||
7919 | =cut | |
eda6e075 | 7920 | |
d12a4851 | 7921 | sub methods_via { |
e22ea7cc | 7922 | |
69893cff | 7923 | # If we've processed this class already, just quit. |
e22ea7cc RF |
7924 | my $class = shift; |
7925 | return if $seen{$class}++; | |
7926 | ||
7927 | # This is a package that is contributing the methods we're about to print. | |
7928 | my $prefix = shift; | |
7929 | my $prepend = $prefix ? "via $prefix: " : ''; | |
69893cff | 7930 | |
e22ea7cc RF |
7931 | my $name; |
7932 | for $name ( | |
69893cff | 7933 | |
69893cff | 7934 | # Keep if this is a defined subroutine in this class. |
e22ea7cc RF |
7935 | grep { defined &{ ${"${class}::"}{$_} } } |
7936 | ||
7937 | # Extract from all the symbols in this class. | |
7938 | sort keys %{"${class}::"} | |
7939 | ) | |
7940 | { | |
7941 | ||
69893cff | 7942 | # If we printed this already, skip it. |
e22ea7cc RF |
7943 | next if $seen{$name}++; |
7944 | ||
69893cff | 7945 | # Print the new method name. |
e22ea7cc RF |
7946 | local $\ = ''; |
7947 | local $, = ''; | |
7948 | print $DB::OUT "$prepend$name\n"; | |
69893cff RGS |
7949 | } ## end for $name (grep { defined... |
7950 | ||
7951 | # If the $crawl_upward argument is false, just quit here. | |
e22ea7cc | 7952 | return unless shift; |
69893cff RGS |
7953 | |
7954 | # $crawl_upward true: keep going up the tree. | |
7955 | # Find all the classes this one is a subclass of. | |
e22ea7cc RF |
7956 | for $name ( @{"${class}::ISA"} ) { |
7957 | ||
69893cff | 7958 | # Set up the new prefix. |
e22ea7cc RF |
7959 | $prepend = $prefix ? $prefix . " -> $name" : $name; |
7960 | ||
7961 | # Crawl up the tree and keep trying to crawl up. | |
7962 | methods_via( $name, $prepend, 1 ); | |
7963 | } | |
69893cff RGS |
7964 | } ## end sub methods_via |
7965 | ||
7966 | =head2 C<setman> - figure out which command to use to show documentation | |
eda6e075 | 7967 | |
69893cff RGS |
7968 | Just checks the contents of C<$^O> and sets the C<$doccmd> global accordingly. |
7969 | ||
7970 | =cut | |
7971 | ||
7972 | sub setman { | |
d12a4851 | 7973 | $doccmd = $^O !~ /^(?:MSWin32|VMS|os2|dos|amigaos|riscos|MacOS|NetWare)\z/s |
e22ea7cc RF |
7974 | ? "man" # O Happy Day! |
7975 | : "perldoc"; # Alas, poor unfortunates | |
69893cff RGS |
7976 | } ## end sub setman |
7977 | ||
7978 | =head2 C<runman> - run the appropriate command to show documentation | |
7979 | ||
7980 | Accepts a man page name; runs the appropriate command to display it (set up | |
7981 | during debugger initialization). Uses C<DB::system> to avoid mucking up the | |
7982 | program's STDIN and STDOUT. | |
7983 | ||
7984 | =cut | |
7985 | ||
d12a4851 JH |
7986 | sub runman { |
7987 | my $page = shift; | |
7988 | unless ($page) { | |
69893cff RGS |
7989 | &system("$doccmd $doccmd"); |
7990 | return; | |
7991 | } | |
7992 | ||
d12a4851 JH |
7993 | # this way user can override, like with $doccmd="man -Mwhatever" |
7994 | # or even just "man " to disable the path check. | |
e22ea7cc | 7995 | unless ( $doccmd eq 'man' ) { |
69893cff RGS |
7996 | &system("$doccmd $page"); |
7997 | return; | |
7998 | } | |
eda6e075 | 7999 | |
d12a4851 | 8000 | $page = 'perl' if lc($page) eq 'help'; |
eda6e075 | 8001 | |
d12a4851 JH |
8002 | require Config; |
8003 | my $man1dir = $Config::Config{'man1dir'}; | |
8004 | my $man3dir = $Config::Config{'man3dir'}; | |
e22ea7cc | 8005 | for ( $man1dir, $man3dir ) { s#/[^/]*\z## if /\S/ } |
d12a4851 JH |
8006 | my $manpath = ''; |
8007 | $manpath .= "$man1dir:" if $man1dir =~ /\S/; | |
8008 | $manpath .= "$man3dir:" if $man3dir =~ /\S/ && $man1dir ne $man3dir; | |
8009 | chop $manpath if $manpath; | |
69893cff | 8010 | |
d12a4851 JH |
8011 | # harmless if missing, I figure |
8012 | my $oldpath = $ENV{MANPATH}; | |
8013 | $ENV{MANPATH} = $manpath if $manpath; | |
8014 | my $nopathopt = $^O =~ /dunno what goes here/; | |
69893cff RGS |
8015 | if ( |
8016 | CORE::system( | |
e22ea7cc | 8017 | $doccmd, |
69893cff | 8018 | |
e22ea7cc RF |
8019 | # I just *know* there are men without -M |
8020 | ( ( $manpath && !$nopathopt ) ? ( "-M", $manpath ) : () ), | |
8021 | split ' ', $page | |
69893cff | 8022 | ) |
e22ea7cc | 8023 | ) |
d12a4851 | 8024 | { |
e22ea7cc | 8025 | unless ( $page =~ /^perl\w/ ) { |
7fddc82f RF |
8026 | # do it this way because its easier to slurp in to keep up to date - clunky though. |
8027 | my @pods = qw( | |
8028 | 5004delta | |
8029 | 5005delta | |
8030 | 561delta | |
8031 | 56delta | |
8032 | 570delta | |
8033 | 571delta | |
8034 | 572delta | |
8035 | 573delta | |
8036 | 58delta | |
2dac93e4 RGS |
8037 | 581delta |
8038 | 582delta | |
8039 | 583delta | |
8040 | 584delta | |
8041 | 590delta | |
8042 | 591delta | |
8043 | 592delta | |
7fddc82f RF |
8044 | aix |
8045 | amiga | |
8046 | apio | |
8047 | api | |
8048 | apollo | |
8049 | artistic | |
8050 | beos | |
8051 | book | |
8052 | boot | |
8053 | bot | |
8054 | bs2000 | |
8055 | call | |
8056 | ce | |
8057 | cheat | |
8058 | clib | |
8059 | cn | |
8060 | compile | |
8061 | cygwin | |
8062 | data | |
8063 | dbmfilter | |
8064 | debguts | |
8065 | debtut | |
8066 | debug | |
8067 | delta | |
8068 | dgux | |
8069 | diag | |
8070 | doc | |
8071 | dos | |
8072 | dsc | |
8073 | ebcdic | |
8074 | embed | |
8075 | epoc | |
8076 | faq1 | |
8077 | faq2 | |
8078 | faq3 | |
8079 | faq4 | |
8080 | faq5 | |
8081 | faq6 | |
8082 | faq7 | |
8083 | faq8 | |
8084 | faq9 | |
8085 | faq | |
8086 | filter | |
8087 | fork | |
8088 | form | |
8089 | freebsd | |
8090 | func | |
8091 | gpl | |
8092 | guts | |
8093 | hack | |
8094 | hist | |
8095 | hpux | |
8096 | hurd | |
8097 | intern | |
8098 | intro | |
8099 | iol | |
8100 | ipc | |
8101 | irix | |
8102 | jp | |
8103 | ko | |
8104 | lexwarn | |
8105 | locale | |
8106 | lol | |
8107 | machten | |
8108 | macos | |
8109 | macosx | |
8110 | mint | |
8111 | modinstall | |
8112 | modlib | |
8113 | mod | |
8114 | modstyle | |
8115 | mpeix | |
8116 | netware | |
8117 | newmod | |
8118 | number | |
8119 | obj | |
8120 | opentut | |
8121 | op | |
8122 | os2 | |
8123 | os390 | |
8124 | os400 | |
8125 | othrtut | |
8126 | packtut | |
8127 | plan9 | |
8128 | pod | |
8129 | podspec | |
8130 | port | |
8131 | qnx | |
8132 | ref | |
8133 | reftut | |
8134 | re | |
8135 | requick | |
8136 | reref | |
8137 | retut | |
8138 | run | |
8139 | sec | |
8140 | solaris | |
8141 | style | |
8142 | sub | |
8143 | syn | |
8144 | thrtut | |
8145 | tie | |
8146 | toc | |
8147 | todo | |
8148 | tooc | |
8149 | toot | |
8150 | trap | |
8151 | tru64 | |
8152 | tw | |
8153 | unicode | |
8154 | uniintro | |
8155 | util | |
8156 | uts | |
8157 | var | |
8158 | vmesa | |
8159 | vms | |
8160 | vos | |
8161 | win32 | |
8162 | xs | |
8163 | xstut | |
8164 | ); | |
8165 | if (grep { $page eq $_ } @pods) { | |
e22ea7cc RF |
8166 | $page =~ s/^/perl/; |
8167 | CORE::system( $doccmd, | |
8168 | ( ( $manpath && !$nopathopt ) ? ( "-M", $manpath ) : () ), | |
8169 | $page ); | |
69893cff RGS |
8170 | } ## end if (grep { $page eq $_... |
8171 | } ## end unless ($page =~ /^perl\w/) | |
8172 | } ## end if (CORE::system($doccmd... | |
e22ea7cc RF |
8173 | if ( defined $oldpath ) { |
8174 | $ENV{MANPATH} = $manpath; | |
69893cff RGS |
8175 | } |
8176 | else { | |
e22ea7cc | 8177 | delete $ENV{MANPATH}; |
69893cff RGS |
8178 | } |
8179 | } ## end sub runman | |
8180 | ||
8181 | #use Carp; # This did break, left for debugging | |
8182 | ||
8183 | =head1 DEBUGGER INITIALIZATION - THE SECOND BEGIN BLOCK | |
8184 | ||
8185 | Because of the way the debugger interface to the Perl core is designed, any | |
8186 | debugger package globals that C<DB::sub()> requires have to be defined before | |
8187 | any subroutines can be called. These are defined in the second C<BEGIN> block. | |
8188 | ||
8189 | This block sets things up so that (basically) the world is sane | |
8190 | before the debugger starts executing. We set up various variables that the | |
8191 | debugger has to have set up before the Perl core starts running: | |
8192 | ||
8193 | =over 4 | |
8194 | ||
be9a9b1d AT |
8195 | =item * |
8196 | ||
8197 | The debugger's own filehandles (copies of STD and STDOUT for now). | |
8198 | ||
8199 | =item * | |
8200 | ||
8201 | Characters for shell escapes, the recall command, and the history command. | |
69893cff | 8202 | |
be9a9b1d | 8203 | =item * |
69893cff | 8204 | |
be9a9b1d | 8205 | The maximum recursion depth. |
69893cff | 8206 | |
be9a9b1d | 8207 | =item * |
69893cff | 8208 | |
be9a9b1d | 8209 | The size of a C<w> command's window. |
69893cff | 8210 | |
be9a9b1d | 8211 | =item * |
69893cff | 8212 | |
be9a9b1d | 8213 | The before-this-line context to be printed in a C<v> (view a window around this line) command. |
69893cff | 8214 | |
be9a9b1d | 8215 | =item * |
69893cff | 8216 | |
be9a9b1d | 8217 | The fact that we're not in a sub at all right now. |
69893cff | 8218 | |
be9a9b1d | 8219 | =item * |
69893cff | 8220 | |
be9a9b1d AT |
8221 | The default SIGINT handler for the debugger. |
8222 | ||
8223 | =item * | |
8224 | ||
8225 | The appropriate value of the flag in C<$^D> that says the debugger is running | |
8226 | ||
8227 | =item * | |
8228 | ||
8229 | The current debugger recursion level | |
8230 | ||
8231 | =item * | |
8232 | ||
8233 | The list of postponed items and the C<$single> stack (XXX define this) | |
8234 | ||
8235 | =item * | |
8236 | ||
8237 | That we want no return values and no subroutine entry/exit trace. | |
69893cff RGS |
8238 | |
8239 | =back | |
8240 | ||
8241 | =cut | |
eda6e075 | 8242 | |
d12a4851 | 8243 | # The following BEGIN is very handy if debugger goes havoc, debugging debugger? |
eda6e075 | 8244 | |
e22ea7cc RF |
8245 | BEGIN { # This does not compile, alas. (XXX eh?) |
8246 | $IN = \*STDIN; # For bugs before DB::OUT has been opened | |
8247 | $OUT = \*STDERR; # For errors before DB::OUT has been opened | |
69893cff | 8248 | |
e22ea7cc RF |
8249 | # Define characters used by command parsing. |
8250 | $sh = '!'; # Shell escape (does not work) | |
8251 | $rc = ','; # Recall command (does not work) | |
8252 | @hist = ('?'); # Show history (does not work) | |
8253 | @truehist = (); # Can be saved for replay (per session) | |
69893cff | 8254 | |
e22ea7cc | 8255 | # This defines the point at which you get the 'deep recursion' |
69893cff | 8256 | # warning. It MUST be defined or the debugger will not load. |
e22ea7cc | 8257 | $deep = 100; |
69893cff | 8258 | |
e22ea7cc | 8259 | # Number of lines around the current one that are shown in the |
69893cff | 8260 | # 'w' command. |
e22ea7cc | 8261 | $window = 10; |
69893cff RGS |
8262 | |
8263 | # How much before-the-current-line context the 'v' command should | |
8264 | # use in calculating the start of the window it will display. | |
e22ea7cc | 8265 | $preview = 3; |
69893cff RGS |
8266 | |
8267 | # We're not in any sub yet, but we need this to be a defined value. | |
e22ea7cc | 8268 | $sub = ''; |
69893cff | 8269 | |
e22ea7cc | 8270 | # Set up the debugger's interrupt handler. It simply sets a flag |
69893cff | 8271 | # ($signal) that DB::DB() will check before each command is executed. |
e22ea7cc | 8272 | $SIG{INT} = \&DB::catch; |
69893cff RGS |
8273 | |
8274 | # The following lines supposedly, if uncommented, allow the debugger to | |
e22ea7cc | 8275 | # debug itself. Perhaps we can try that someday. |
69893cff | 8276 | # This may be enabled to debug debugger: |
e22ea7cc RF |
8277 | #$warnLevel = 1 unless defined $warnLevel; |
8278 | #$dieLevel = 1 unless defined $dieLevel; | |
8279 | #$signalLevel = 1 unless defined $signalLevel; | |
d12a4851 | 8280 | |
69893cff RGS |
8281 | # This is the flag that says "a debugger is running, please call |
8282 | # DB::DB and DB::sub". We will turn it on forcibly before we try to | |
8283 | # execute anything in the user's context, because we always want to | |
8284 | # get control back. | |
e22ea7cc RF |
8285 | $db_stop = 0; # Compiler warning ... |
8286 | $db_stop = 1 << 30; # ... because this is only used in an eval() later. | |
69893cff RGS |
8287 | |
8288 | # This variable records how many levels we're nested in debugging. Used | |
e22ea7cc | 8289 | # Used in the debugger prompt, and in determining whether it's all over or |
69893cff | 8290 | # not. |
e22ea7cc | 8291 | $level = 0; # Level of recursive debugging |
69893cff RGS |
8292 | |
8293 | # "Triggers bug (?) in perl if we postpone this until runtime." | |
8294 | # XXX No details on this yet, or whether we should fix the bug instead | |
e22ea7cc RF |
8295 | # of work around it. Stay tuned. |
8296 | @postponed = @stack = (0); | |
69893cff RGS |
8297 | |
8298 | # Used to track the current stack depth using the auto-stacked-variable | |
8299 | # trick. | |
e22ea7cc | 8300 | $stack_depth = 0; # Localized repeatedly; simple way to track $#stack |
69893cff RGS |
8301 | |
8302 | # Don't print return values on exiting a subroutine. | |
e22ea7cc | 8303 | $doret = -2; |
69893cff RGS |
8304 | |
8305 | # No extry/exit tracing. | |
e22ea7cc | 8306 | $frame = 0; |
eda6e075 | 8307 | |
69893cff RGS |
8308 | } ## end BEGIN |
8309 | ||
8310 | BEGIN { $^W = $ini_warn; } # Switch warnings back | |
8311 | ||
8312 | =head1 READLINE SUPPORT - COMPLETION FUNCTION | |
8313 | ||
8314 | =head2 db_complete | |
eda6e075 | 8315 | |
69893cff RGS |
8316 | C<readline> support - adds command completion to basic C<readline>. |
8317 | ||
8318 | Returns a list of possible completions to C<readline> when invoked. C<readline> | |
8319 | will print the longest common substring following the text already entered. | |
8320 | ||
8321 | If there is only a single possible completion, C<readline> will use it in full. | |
8322 | ||
8323 | This code uses C<map> and C<grep> heavily to create lists of possible | |
8324 | completion. Think LISP in this section. | |
8325 | ||
8326 | =cut | |
eda6e075 | 8327 | |
d12a4851 | 8328 | sub db_complete { |
69893cff RGS |
8329 | |
8330 | # Specific code for b c l V m f O, &blah, $blah, @blah, %blah | |
8331 | # $text is the text to be completed. | |
8332 | # $line is the incoming line typed by the user. | |
8333 | # $start is the start of the text to be completed in the incoming line. | |
e22ea7cc | 8334 | my ( $text, $line, $start ) = @_; |
69893cff RGS |
8335 | |
8336 | # Save the initial text. | |
8337 | # The search pattern is current package, ::, extract the next qualifier | |
8338 | # Prefix and pack are set to undef. | |
e22ea7cc RF |
8339 | my ( $itext, $search, $prefix, $pack ) = |
8340 | ( $text, "^\Q${'package'}::\E([^:]+)\$" ); | |
8341 | ||
69893cff RGS |
8342 | =head3 C<b postpone|compile> |
8343 | ||
8344 | =over 4 | |
8345 | ||
be9a9b1d AT |
8346 | =item * |
8347 | ||
8348 | Find all the subroutines that might match in this package | |
8349 | ||
8350 | =item * | |
8351 | ||
3c4b39be | 8352 | Add C<postpone>, C<load>, and C<compile> as possibles (we may be completing the keyword itself) |
be9a9b1d AT |
8353 | |
8354 | =item * | |
8355 | ||
8356 | Include all the rest of the subs that are known | |
69893cff | 8357 | |
be9a9b1d | 8358 | =item * |
69893cff | 8359 | |
be9a9b1d | 8360 | C<grep> out the ones that match the text we have so far |
69893cff | 8361 | |
be9a9b1d | 8362 | =item * |
69893cff | 8363 | |
be9a9b1d | 8364 | Return this as the list of possible completions |
69893cff RGS |
8365 | |
8366 | =back | |
8367 | ||
8368 | =cut | |
8369 | ||
e22ea7cc RF |
8370 | return sort grep /^\Q$text/, ( keys %sub ), |
8371 | qw(postpone load compile), # subroutines | |
8372 | ( map { /$search/ ? ($1) : () } keys %sub ) | |
8373 | if ( substr $line, 0, $start ) =~ /^\|*[blc]\s+((postpone|compile)\s+)?$/; | |
69893cff RGS |
8374 | |
8375 | =head3 C<b load> | |
8376 | ||
be9a9b1d | 8377 | Get all the possible files from C<@INC> as it currently stands and |
69893cff RGS |
8378 | select the ones that match the text so far. |
8379 | ||
8380 | =cut | |
8381 | ||
e22ea7cc RF |
8382 | return sort grep /^\Q$text/, values %INC # files |
8383 | if ( substr $line, 0, $start ) =~ /^\|*b\s+load\s+$/; | |
69893cff RGS |
8384 | |
8385 | =head3 C<V> (list variable) and C<m> (list modules) | |
8386 | ||
8387 | There are two entry points for these commands: | |
8388 | ||
8389 | =head4 Unqualified package names | |
8390 | ||
8391 | Get the top-level packages and grab everything that matches the text | |
8392 | so far. For each match, recursively complete the partial packages to | |
8393 | get all possible matching packages. Return this sorted list. | |
8394 | ||
8395 | =cut | |
8396 | ||
e22ea7cc RF |
8397 | return sort map { ( $_, db_complete( $_ . "::", "V ", 2 ) ) } |
8398 | grep /^\Q$text/, map { /^(.*)::$/ ? ($1) : () } keys %:: # top-packages | |
8399 | if ( substr $line, 0, $start ) =~ /^\|*[Vm]\s+$/ and $text =~ /^\w*$/; | |
69893cff RGS |
8400 | |
8401 | =head4 Qualified package names | |
8402 | ||
8403 | Take a partially-qualified package and find all subpackages for it | |
8404 | by getting all the subpackages for the package so far, matching all | |
8405 | the subpackages against the text, and discarding all of them which | |
8406 | start with 'main::'. Return this list. | |
8407 | ||
8408 | =cut | |
8409 | ||
e22ea7cc RF |
8410 | return sort map { ( $_, db_complete( $_ . "::", "V ", 2 ) ) } |
8411 | grep !/^main::/, grep /^\Q$text/, | |
8412 | map { /^(.*)::$/ ? ( $prefix . "::$1" ) : () } keys %{ $prefix . '::' } | |
8413 | if ( substr $line, 0, $start ) =~ /^\|*[Vm]\s+$/ | |
8414 | and $text =~ /^(.*[^:])::?(\w*)$/ | |
8415 | and $prefix = $1; | |
69893cff RGS |
8416 | |
8417 | =head3 C<f> - switch files | |
8418 | ||
8419 | Here, we want to get a fully-qualified filename for the C<f> command. | |
8420 | Possibilities are: | |
8421 | ||
8422 | =over 4 | |
8423 | ||
8424 | =item 1. The original source file itself | |
8425 | ||
8426 | =item 2. A file from C<@INC> | |
8427 | ||
8428 | =item 3. An C<eval> (the debugger gets a C<(eval N)> fake file for each C<eval>). | |
8429 | ||
8430 | =back | |
8431 | ||
8432 | =cut | |
8433 | ||
e22ea7cc RF |
8434 | if ( $line =~ /^\|*f\s+(.*)/ ) { # Loaded files |
8435 | # We might possibly want to switch to an eval (which has a "filename" | |
8436 | # like '(eval 9)'), so we may need to clean up the completion text | |
8437 | # before proceeding. | |
8438 | $prefix = length($1) - length($text); | |
8439 | $text = $1; | |
69893cff RGS |
8440 | |
8441 | =pod | |
8442 | ||
8443 | Under the debugger, source files are represented as C<_E<lt>/fullpath/to/file> | |
8444 | (C<eval>s are C<_E<lt>(eval NNN)>) keys in C<%main::>. We pull all of these | |
8445 | out of C<%main::>, add the initial source file, and extract the ones that | |
8446 | match the completion text so far. | |
8447 | ||
8448 | =cut | |
8449 | ||
e22ea7cc RF |
8450 | return sort |
8451 | map { substr $_, 2 + $prefix } grep /^_<\Q$text/, ( keys %main:: ), | |
8452 | $0; | |
69893cff RGS |
8453 | } ## end if ($line =~ /^\|*f\s+(.*)/) |
8454 | ||
8455 | =head3 Subroutine name completion | |
8456 | ||
8457 | We look through all of the defined subs (the keys of C<%sub>) and | |
8458 | return both all the possible matches to the subroutine name plus | |
8459 | all the matches qualified to the current package. | |
8460 | ||
8461 | =cut | |
8462 | ||
e22ea7cc RF |
8463 | if ( ( substr $text, 0, 1 ) eq '&' ) { # subroutines |
8464 | $text = substr $text, 1; | |
8465 | $prefix = "&"; | |
8466 | return sort map "$prefix$_", grep /^\Q$text/, ( keys %sub ), | |
69893cff RGS |
8467 | ( |
8468 | map { /$search/ ? ($1) : () } | |
e22ea7cc RF |
8469 | keys %sub |
8470 | ); | |
69893cff RGS |
8471 | } ## end if ((substr $text, 0, ... |
8472 | ||
8473 | =head3 Scalar, array, and hash completion: partially qualified package | |
8474 | ||
8475 | Much like the above, except we have to do a little more cleanup: | |
8476 | ||
8477 | =cut | |
8478 | ||
e22ea7cc | 8479 | if ( $text =~ /^[\$@%](.*)::(.*)/ ) { # symbols in a package |
69893cff RGS |
8480 | |
8481 | =pod | |
8482 | ||
8483 | =over 4 | |
8484 | ||
be9a9b1d AT |
8485 | =item * |
8486 | ||
8487 | Determine the package that the symbol is in. Put it in C<::> (effectively C<main::>) if no package is specified. | |
69893cff RGS |
8488 | |
8489 | =cut | |
8490 | ||
e22ea7cc | 8491 | $pack = ( $1 eq 'main' ? '' : $1 ) . '::'; |
69893cff RGS |
8492 | |
8493 | =pod | |
8494 | ||
be9a9b1d AT |
8495 | =item * |
8496 | ||
8497 | Figure out the prefix vs. what needs completing. | |
69893cff RGS |
8498 | |
8499 | =cut | |
8500 | ||
e22ea7cc RF |
8501 | $prefix = ( substr $text, 0, 1 ) . $1 . '::'; |
8502 | $text = $2; | |
69893cff RGS |
8503 | |
8504 | =pod | |
8505 | ||
be9a9b1d AT |
8506 | =item * |
8507 | ||
8508 | Look through all the symbols in the package. C<grep> out all the possible hashes/arrays/scalars, and then C<grep> the possible matches out of those. C<map> the prefix onto all the possibilities. | |
69893cff RGS |
8509 | |
8510 | =cut | |
8511 | ||
e22ea7cc RF |
8512 | my @out = map "$prefix$_", grep /^\Q$text/, grep /^_?[a-zA-Z]/, |
8513 | keys %$pack; | |
69893cff RGS |
8514 | |
8515 | =pod | |
8516 | ||
be9a9b1d AT |
8517 | =item * |
8518 | ||
8519 | If there's only one hit, and it's a package qualifier, and it's not equal to the initial text, re-complete it using the symbol we actually found. | |
69893cff RGS |
8520 | |
8521 | =cut | |
8522 | ||
e22ea7cc RF |
8523 | if ( @out == 1 and $out[0] =~ /::$/ and $out[0] ne $itext ) { |
8524 | return db_complete( $out[0], $line, $start ); | |
8525 | } | |
69893cff RGS |
8526 | |
8527 | # Return the list of possibles. | |
e22ea7cc | 8528 | return sort @out; |
69893cff RGS |
8529 | |
8530 | } ## end if ($text =~ /^[\$@%](.*)::(.*)/) | |
8531 | ||
8532 | =pod | |
8533 | ||
8534 | =back | |
8535 | ||
8536 | =head3 Symbol completion: current package or package C<main>. | |
8537 | ||
8538 | =cut | |
8539 | ||
e22ea7cc | 8540 | if ( $text =~ /^[\$@%]/ ) { # symbols (in $package + packages in main) |
69893cff RGS |
8541 | |
8542 | =pod | |
8543 | ||
8544 | =over 4 | |
8545 | ||
be9a9b1d AT |
8546 | =item * |
8547 | ||
8548 | If it's C<main>, delete main to just get C<::> leading. | |
69893cff RGS |
8549 | |
8550 | =cut | |
8551 | ||
e22ea7cc | 8552 | $pack = ( $package eq 'main' ? '' : $package ) . '::'; |
69893cff RGS |
8553 | |
8554 | =pod | |
8555 | ||
be9a9b1d AT |
8556 | =item * |
8557 | ||
8558 | We set the prefix to the item's sigil, and trim off the sigil to get the text to be completed. | |
69893cff RGS |
8559 | |
8560 | =cut | |
8561 | ||
e22ea7cc RF |
8562 | $prefix = substr $text, 0, 1; |
8563 | $text = substr $text, 1; | |
69893cff RGS |
8564 | |
8565 | =pod | |
8566 | ||
be9a9b1d AT |
8567 | =item * |
8568 | ||
8569 | If the package is C<::> (C<main>), create an empty list; if it's something else, create a list of all the packages known. Append whichever list to a list of all the possible symbols in the current package. C<grep> out the matches to the text entered so far, then C<map> the prefix back onto the symbols. | |
69893cff RGS |
8570 | |
8571 | =cut | |
8572 | ||
e22ea7cc RF |
8573 | my @out = map "$prefix$_", grep /^\Q$text/, |
8574 | ( grep /^_?[a-zA-Z]/, keys %$pack ), | |
8575 | ( $pack eq '::' ? () : ( grep /::$/, keys %:: ) ); | |
69893cff | 8576 | |
be9a9b1d AT |
8577 | =item * |
8578 | ||
8579 | If there's only one hit, it's a package qualifier, and it's not equal to the initial text, recomplete using this symbol. | |
69893cff RGS |
8580 | |
8581 | =back | |
8582 | ||
8583 | =cut | |
8584 | ||
e22ea7cc RF |
8585 | if ( @out == 1 and $out[0] =~ /::$/ and $out[0] ne $itext ) { |
8586 | return db_complete( $out[0], $line, $start ); | |
8587 | } | |
69893cff RGS |
8588 | |
8589 | # Return the list of possibles. | |
e22ea7cc | 8590 | return sort @out; |
69893cff RGS |
8591 | } ## end if ($text =~ /^[\$@%]/) |
8592 | ||
8593 | =head3 Options | |
8594 | ||
8595 | We use C<option_val()> to look up the current value of the option. If there's | |
8596 | only a single value, we complete the command in such a way that it is a | |
8597 | complete command for setting the option in question. If there are multiple | |
8598 | possible values, we generate a command consisting of the option plus a trailing | |
8599 | question mark, which, if executed, will list the current value of the option. | |
8600 | ||
8601 | =cut | |
8602 | ||
e22ea7cc RF |
8603 | if ( ( substr $line, 0, $start ) =~ /^\|*[oO]\b.*\s$/ ) |
8604 | { # Options after space | |
8605 | # We look for the text to be matched in the list of possible options, | |
8606 | # and fetch the current value. | |
8607 | my @out = grep /^\Q$text/, @options; | |
8608 | my $val = option_val( $out[0], undef ); | |
69893cff RGS |
8609 | |
8610 | # Set up a 'query option's value' command. | |
e22ea7cc RF |
8611 | my $out = '? '; |
8612 | if ( not defined $val or $val =~ /[\n\r]/ ) { | |
8613 | ||
8614 | # There's really nothing else we can do. | |
8615 | } | |
69893cff RGS |
8616 | |
8617 | # We have a value. Create a proper option-setting command. | |
e22ea7cc RF |
8618 | elsif ( $val =~ /\s/ ) { |
8619 | ||
69893cff | 8620 | # XXX This may be an extraneous variable. |
e22ea7cc | 8621 | my $found; |
69893cff RGS |
8622 | |
8623 | # We'll want to quote the string (because of the embedded | |
8624 | # whtespace), but we want to make sure we don't end up with | |
8625 | # mismatched quote characters. We try several possibilities. | |
e22ea7cc RF |
8626 | foreach $l ( split //, qq/\"\'\#\|/ ) { |
8627 | ||
69893cff RGS |
8628 | # If we didn't find this quote character in the value, |
8629 | # quote it using this quote character. | |
e22ea7cc RF |
8630 | $out = "$l$val$l ", last if ( index $val, $l ) == -1; |
8631 | } | |
69893cff RGS |
8632 | } ## end elsif ($val =~ /\s/) |
8633 | ||
8634 | # Don't need any quotes. | |
e22ea7cc RF |
8635 | else { |
8636 | $out = "=$val "; | |
8637 | } | |
69893cff RGS |
8638 | |
8639 | # If there were multiple possible values, return '? ', which | |
8640 | # makes the command into a query command. If there was just one, | |
8641 | # have readline append that. | |
e22ea7cc RF |
8642 | $rl_attribs->{completer_terminator_character} = |
8643 | ( @out == 1 ? $out : '? ' ); | |
69893cff RGS |
8644 | |
8645 | # Return list of possibilities. | |
e22ea7cc | 8646 | return sort @out; |
69893cff RGS |
8647 | } ## end if ((substr $line, 0, ... |
8648 | ||
8649 | =head3 Filename completion | |
8650 | ||
8651 | For entering filenames. We simply call C<readline>'s C<filename_list()> | |
8652 | method with the completion text to get the possible completions. | |
8653 | ||
8654 | =cut | |
8655 | ||
e22ea7cc | 8656 | return $term->filename_list($text); # filenames |
69893cff RGS |
8657 | |
8658 | } ## end sub db_complete | |
8659 | ||
8660 | =head1 MISCELLANEOUS SUPPORT FUNCTIONS | |
8661 | ||
8662 | Functions that possibly ought to be somewhere else. | |
8663 | ||
8664 | =head2 end_report | |
8665 | ||
8666 | Say we're done. | |
8667 | ||
8668 | =cut | |
55497cff | 8669 | |
43aed9ee | 8670 | sub end_report { |
e22ea7cc RF |
8671 | local $\ = ''; |
8672 | print $OUT "Use `q' to quit or `R' to restart. `h q' for details.\n"; | |
43aed9ee | 8673 | } |
4639966b | 8674 | |
69893cff RGS |
8675 | =head2 clean_ENV |
8676 | ||
8677 | If we have $ini_pids, save it in the environment; else remove it from the | |
8678 | environment. Used by the C<R> (restart) command. | |
8679 | ||
8680 | =cut | |
8681 | ||
bf25f2b5 | 8682 | sub clean_ENV { |
e22ea7cc | 8683 | if ( defined($ini_pids) ) { |
bf25f2b5 | 8684 | $ENV{PERLDB_PIDS} = $ini_pids; |
e22ea7cc | 8685 | } |
69893cff | 8686 | else { |
e22ea7cc | 8687 | delete( $ENV{PERLDB_PIDS} ); |
bf25f2b5 | 8688 | } |
69893cff | 8689 | } ## end sub clean_ENV |
06492da6 | 8690 | |
d12a4851 | 8691 | # PERLDBf_... flag names from perl.h |
e22ea7cc RF |
8692 | our ( %DollarCaretP_flags, %DollarCaretP_flags_r ); |
8693 | ||
d12a4851 | 8694 | BEGIN { |
e22ea7cc RF |
8695 | %DollarCaretP_flags = ( |
8696 | PERLDBf_SUB => 0x01, # Debug sub enter/exit | |
8697 | PERLDBf_LINE => 0x02, # Keep line # | |
8698 | PERLDBf_NOOPT => 0x04, # Switch off optimizations | |
8699 | PERLDBf_INTER => 0x08, # Preserve more data | |
8700 | PERLDBf_SUBLINE => 0x10, # Keep subr source lines | |
8701 | PERLDBf_SINGLE => 0x20, # Start with single-step on | |
8702 | PERLDBf_NONAME => 0x40, # For _SUB: no name of the subr | |
8703 | PERLDBf_GOTO => 0x80, # Report goto: call DB::goto | |
8704 | PERLDBf_NAMEEVAL => 0x100, # Informative names for evals | |
8705 | PERLDBf_NAMEANON => 0x200, # Informative names for anon subs | |
584420f0 | 8706 | PERLDB_ALL => 0x33f, # No _NONAME, _GOTO |
d12a4851 | 8707 | ); |
06492da6 | 8708 | |
e22ea7cc | 8709 | %DollarCaretP_flags_r = reverse %DollarCaretP_flags; |
d12a4851 | 8710 | } |
eda6e075 | 8711 | |
d12a4851 | 8712 | sub parse_DollarCaretP_flags { |
e22ea7cc RF |
8713 | my $flags = shift; |
8714 | $flags =~ s/^\s+//; | |
8715 | $flags =~ s/\s+$//; | |
8716 | my $acu = 0; | |
8717 | foreach my $f ( split /\s*\|\s*/, $flags ) { | |
8718 | my $value; | |
8719 | if ( $f =~ /^0x([[:xdigit:]]+)$/ ) { | |
8720 | $value = hex $1; | |
8721 | } | |
8722 | elsif ( $f =~ /^(\d+)$/ ) { | |
8723 | $value = int $1; | |
8724 | } | |
8725 | elsif ( $f =~ /^DEFAULT$/i ) { | |
8726 | $value = $DollarCaretP_flags{PERLDB_ALL}; | |
8727 | } | |
8728 | else { | |
8729 | $f =~ /^(?:PERLDBf_)?(.*)$/i; | |
8730 | $value = $DollarCaretP_flags{ 'PERLDBf_' . uc($1) }; | |
8731 | unless ( defined $value ) { | |
8732 | print $OUT ( | |
8733 | "Unrecognized \$^P flag '$f'!\n", | |
8734 | "Acceptable flags are: " | |
8735 | . join( ', ', sort keys %DollarCaretP_flags ), | |
8736 | ", and hexadecimal and decimal numbers.\n" | |
8737 | ); | |
8738 | return undef; | |
8739 | } | |
8740 | } | |
8741 | $acu |= $value; | |
d12a4851 JH |
8742 | } |
8743 | $acu; | |
8744 | } | |
eda6e075 | 8745 | |
d12a4851 | 8746 | sub expand_DollarCaretP_flags { |
e22ea7cc RF |
8747 | my $DollarCaretP = shift; |
8748 | my @bits = ( | |
8749 | map { | |
8750 | my $n = ( 1 << $_ ); | |
8751 | ( $DollarCaretP & $n ) | |
8752 | ? ( $DollarCaretP_flags_r{$n} | |
8753 | || sprintf( '0x%x', $n ) ) | |
8754 | : () | |
8755 | } 0 .. 31 | |
8756 | ); | |
8757 | return @bits ? join( '|', @bits ) : 0; | |
d12a4851 | 8758 | } |
06492da6 | 8759 | |
be9a9b1d AT |
8760 | =over 4 |
8761 | ||
7fddc82f RF |
8762 | =item rerun |
8763 | ||
8764 | Rerun the current session to: | |
8765 | ||
8766 | rerun current position | |
8767 | ||
8768 | rerun 4 command number 4 | |
8769 | ||
8770 | rerun -4 current command minus 4 (go back 4 steps) | |
8771 | ||
8772 | Whether this always makes sense, in the current context is unknowable, and is | |
8773 | in part left as a useful exersize for the reader. This sub returns the | |
8774 | appropriate arguments to rerun the current session. | |
8775 | ||
8776 | =cut | |
8777 | ||
8778 | sub rerun { | |
8779 | my $i = shift; | |
8780 | my @args; | |
8781 | pop(@truehist); # strim | |
8782 | unless (defined $truehist[$i]) { | |
8783 | print "Unable to return to non-existent command: $i\n"; | |
8784 | } else { | |
8785 | $#truehist = ($i < 0 ? $#truehist + $i : $i > 0 ? $i : $#truehist); | |
8786 | my @temp = @truehist; # store | |
8787 | push(@DB::typeahead, @truehist); # saved | |
8788 | @truehist = @hist = (); # flush | |
8789 | @args = &restart(); # setup | |
8790 | &get_list("PERLDB_HIST"); # clean | |
8791 | &set_list("PERLDB_HIST", @temp); # reset | |
8792 | } | |
8793 | return @args; | |
8794 | } | |
8795 | ||
8796 | =item restart | |
8797 | ||
8798 | Restarting the debugger is a complex operation that occurs in several phases. | |
8799 | First, we try to reconstruct the command line that was used to invoke Perl | |
8800 | and the debugger. | |
8801 | ||
8802 | =cut | |
8803 | ||
8804 | sub restart { | |
8805 | # I may not be able to resurrect you, but here goes ... | |
8806 | print $OUT | |
8807 | "Warning: some settings and command-line options may be lost!\n"; | |
8808 | my ( @script, @flags, $cl ); | |
8809 | ||
8810 | # If warn was on before, turn it on again. | |
8811 | push @flags, '-w' if $ini_warn; | |
7fddc82f RF |
8812 | |
8813 | # Rebuild the -I flags that were on the initial | |
8814 | # command line. | |
8815 | for (@ini_INC) { | |
8816 | push @flags, '-I', $_; | |
8817 | } | |
8818 | ||
8819 | # Turn on taint if it was on before. | |
8820 | push @flags, '-T' if ${^TAINT}; | |
8821 | ||
8822 | # Arrange for setting the old INC: | |
8823 | # Save the current @init_INC in the environment. | |
8824 | set_list( "PERLDB_INC", @ini_INC ); | |
8825 | ||
8826 | # If this was a perl one-liner, go to the "file" | |
8827 | # corresponding to the one-liner read all the lines | |
8828 | # out of it (except for the first one, which is going | |
8829 | # to be added back on again when 'perl -d' runs: that's | |
8830 | # the 'require perl5db.pl;' line), and add them back on | |
8831 | # to the command line to be executed. | |
8832 | if ( $0 eq '-e' ) { | |
8833 | for ( 1 .. $#{'::_<-e'} ) { # The first line is PERL5DB | |
8834 | chomp( $cl = ${'::_<-e'}[$_] ); | |
8835 | push @script, '-e', $cl; | |
8836 | } | |
8837 | } ## end if ($0 eq '-e') | |
8838 | ||
8839 | # Otherwise we just reuse the original name we had | |
8840 | # before. | |
8841 | else { | |
8842 | @script = $0; | |
8843 | } | |
8844 | ||
8845 | =pod | |
8846 | ||
8847 | After the command line has been reconstructed, the next step is to save | |
8848 | the debugger's status in environment variables. The C<DB::set_list> routine | |
8849 | is used to save aggregate variables (both hashes and arrays); scalars are | |
8850 | just popped into environment variables directly. | |
8851 | ||
8852 | =cut | |
8853 | ||
8854 | # If the terminal supported history, grab it and | |
8855 | # save that in the environment. | |
8856 | set_list( "PERLDB_HIST", | |
8857 | $term->Features->{getHistory} | |
8858 | ? $term->GetHistory | |
8859 | : @hist ); | |
8860 | ||
8861 | # Find all the files that were visited during this | |
8862 | # session (i.e., the debugger had magic hashes | |
8863 | # corresponding to them) and stick them in the environment. | |
8864 | my @had_breakpoints = keys %had_breakpoints; | |
8865 | set_list( "PERLDB_VISITED", @had_breakpoints ); | |
8866 | ||
8867 | # Save the debugger options we chose. | |
8868 | set_list( "PERLDB_OPT", %option ); | |
8869 | # set_list( "PERLDB_OPT", options2remember() ); | |
8870 | ||
8871 | # Save the break-on-loads. | |
8872 | set_list( "PERLDB_ON_LOAD", %break_on_load ); | |
8873 | ||
8874 | =pod | |
8875 | ||
8876 | The most complex part of this is the saving of all of the breakpoints. They | |
8877 | can live in an awful lot of places, and we have to go through all of them, | |
8878 | find the breakpoints, and then save them in the appropriate environment | |
8879 | variable via C<DB::set_list>. | |
8880 | ||
8881 | =cut | |
8882 | ||
8883 | # Go through all the breakpoints and make sure they're | |
8884 | # still valid. | |
8885 | my @hard; | |
8886 | for ( 0 .. $#had_breakpoints ) { | |
8887 | ||
8888 | # We were in this file. | |
8889 | my $file = $had_breakpoints[$_]; | |
8890 | ||
8891 | # Grab that file's magic line hash. | |
8892 | *dbline = $main::{ '_<' . $file }; | |
8893 | ||
8894 | # Skip out if it doesn't exist, or if the breakpoint | |
8895 | # is in a postponed file (we'll do postponed ones | |
8896 | # later). | |
8897 | next unless %dbline or $postponed_file{$file}; | |
8898 | ||
8899 | # In an eval. This is a little harder, so we'll | |
8900 | # do more processing on that below. | |
8901 | ( push @hard, $file ), next | |
8902 | if $file =~ /^\(\w*eval/; | |
8903 | ||
8904 | # XXX I have no idea what this is doing. Yet. | |
8905 | my @add; | |
8906 | @add = %{ $postponed_file{$file} } | |
8907 | if $postponed_file{$file}; | |
8908 | ||
8909 | # Save the list of all the breakpoints for this file. | |
8910 | set_list( "PERLDB_FILE_$_", %dbline, @add ); | |
8911 | } ## end for (0 .. $#had_breakpoints) | |
8912 | ||
8913 | # The breakpoint was inside an eval. This is a little | |
8914 | # more difficult. XXX and I don't understand it. | |
8915 | for (@hard) { | |
8916 | # Get over to the eval in question. | |
8917 | *dbline = $main::{ '_<' . $_ }; | |
8918 | my ( $quoted, $sub, %subs, $line ) = quotemeta $_; | |
8919 | for $sub ( keys %sub ) { | |
8920 | next unless $sub{$sub} =~ /^$quoted:(\d+)-(\d+)$/; | |
8921 | $subs{$sub} = [ $1, $2 ]; | |
8922 | } | |
8923 | unless (%subs) { | |
8924 | print $OUT | |
8925 | "No subroutines in $_, ignoring breakpoints.\n"; | |
8926 | next; | |
8927 | } | |
8928 | LINES: for $line ( keys %dbline ) { | |
8929 | ||
8930 | # One breakpoint per sub only: | |
8931 | my ( $offset, $sub, $found ); | |
8932 | SUBS: for $sub ( keys %subs ) { | |
8933 | if ( | |
8934 | $subs{$sub}->[1] >= | |
8935 | $line # Not after the subroutine | |
8936 | and ( | |
8937 | not defined $offset # Not caught | |
8938 | or $offset < 0 | |
8939 | ) | |
8940 | ) | |
8941 | { # or badly caught | |
8942 | $found = $sub; | |
8943 | $offset = $line - $subs{$sub}->[0]; | |
8944 | $offset = "+$offset", last SUBS | |
8945 | if $offset >= 0; | |
8946 | } ## end if ($subs{$sub}->[1] >=... | |
8947 | } ## end for $sub (keys %subs) | |
8948 | if ( defined $offset ) { | |
8949 | $postponed{$found} = | |
8950 | "break $offset if $dbline{$line}"; | |
8951 | } | |
8952 | else { | |
8953 | print $OUT | |
8954 | "Breakpoint in $_:$line ignored: after all the subroutines.\n"; | |
8955 | } | |
8956 | } ## end for $line (keys %dbline) | |
8957 | } ## end for (@hard) | |
8958 | ||
8959 | # Save the other things that don't need to be | |
8960 | # processed. | |
8961 | set_list( "PERLDB_POSTPONE", %postponed ); | |
8962 | set_list( "PERLDB_PRETYPE", @$pretype ); | |
8963 | set_list( "PERLDB_PRE", @$pre ); | |
8964 | set_list( "PERLDB_POST", @$post ); | |
8965 | set_list( "PERLDB_TYPEAHEAD", @typeahead ); | |
8966 | ||
8967 | # We are oficially restarting. | |
8968 | $ENV{PERLDB_RESTART} = 1; | |
8969 | ||
8970 | # We are junking all child debuggers. | |
8971 | delete $ENV{PERLDB_PIDS}; # Restore ini state | |
8972 | ||
8973 | # Set this back to the initial pid. | |
8974 | $ENV{PERLDB_PIDS} = $ini_pids if defined $ini_pids; | |
8975 | ||
8976 | =pod | |
8977 | ||
8978 | After all the debugger status has been saved, we take the command we built up | |
8979 | and then return it, so we can C<exec()> it. The debugger will spot the | |
8980 | C<PERLDB_RESTART> environment variable and realize it needs to reload its state | |
8981 | from the environment. | |
8982 | ||
8983 | =cut | |
8984 | ||
8985 | # And run Perl again. Add the "-d" flag, all the | |
8986 | # flags we built up, the script (whether a one-liner | |
8987 | # or a file), add on the -emacs flag for a slave editor, | |
8988 | # and then the old arguments. | |
8989 | ||
8990 | return ($^X, '-d', @flags, @script, ($slave_editor ? '-emacs' : ()), @ARGS); | |
8991 | ||
8992 | }; # end restart | |
8993 | ||
be9a9b1d AT |
8994 | =back |
8995 | ||
69893cff RGS |
8996 | =head1 END PROCESSING - THE C<END> BLOCK |
8997 | ||
8998 | Come here at the very end of processing. We want to go into a | |
8999 | loop where we allow the user to enter commands and interact with the | |
9000 | debugger, but we don't want anything else to execute. | |
9001 | ||
9002 | First we set the C<$finished> variable, so that some commands that | |
9003 | shouldn't be run after the end of program quit working. | |
9004 | ||
9005 | We then figure out whether we're truly done (as in the user entered a C<q> | |
9006 | command, or we finished execution while running nonstop). If we aren't, | |
9007 | we set C<$single> to 1 (causing the debugger to get control again). | |
9008 | ||
be9a9b1d | 9009 | We then call C<DB::fake::at_exit()>, which returns the C<Use 'q' to quit ...> |
69893cff RGS |
9010 | message and returns control to the debugger. Repeat. |
9011 | ||
9012 | When the user finally enters a C<q> command, C<$fall_off_end> is set to | |
9013 | 1 and the C<END> block simply exits with C<$single> set to 0 (don't | |
9014 | break, run to completion.). | |
9015 | ||
9016 | =cut | |
9017 | ||
55497cff | 9018 | END { |
e22ea7cc RF |
9019 | $finished = 1 if $inhibit_exit; # So that some commands may be disabled. |
9020 | $fall_off_end = 1 unless $inhibit_exit; | |
69893cff | 9021 | |
e22ea7cc | 9022 | # Do not stop in at_exit() and destructors on exit: |
5561b870 A |
9023 | if ($fall_off_end or $runnonstop) { |
9024 | &save_hist(); | |
9025 | } else { | |
9026 | $DB::single = 1; | |
9027 | DB::fake::at_exit(); | |
9028 | } | |
69893cff | 9029 | } ## end END |
eda6e075 | 9030 | |
69893cff | 9031 | =head1 PRE-5.8 COMMANDS |
eda6e075 | 9032 | |
69893cff RGS |
9033 | Some of the commands changed function quite a bit in the 5.8 command |
9034 | realignment, so much so that the old code had to be replaced completely. | |
9035 | Because we wanted to retain the option of being able to go back to the | |
9036 | former command set, we moved the old code off to this section. | |
9037 | ||
9038 | There's an awful lot of duplicated code here. We've duplicated the | |
9039 | comments to keep things clear. | |
9040 | ||
9041 | =head2 Null command | |
9042 | ||
be9a9b1d | 9043 | Does nothing. Used to I<turn off> commands. |
69893cff RGS |
9044 | |
9045 | =cut | |
492652be RF |
9046 | |
9047 | sub cmd_pre580_null { | |
69893cff RGS |
9048 | |
9049 | # do nothing... | |
492652be RF |
9050 | } |
9051 | ||
69893cff RGS |
9052 | =head2 Old C<a> command. |
9053 | ||
9054 | This version added actions if you supplied them, and deleted them | |
9055 | if you didn't. | |
9056 | ||
9057 | =cut | |
9058 | ||
492652be | 9059 | sub cmd_pre580_a { |
69893cff RGS |
9060 | my $xcmd = shift; |
9061 | my $cmd = shift; | |
9062 | ||
9063 | # Argument supplied. Add the action. | |
e22ea7cc | 9064 | if ( $cmd =~ /^(\d*)\s*(.*)/ ) { |
69893cff RGS |
9065 | |
9066 | # If the line isn't there, use the current line. | |
9067 | $i = $1 || $line; | |
9068 | $j = $2; | |
9069 | ||
9070 | # If there is an action ... | |
e22ea7cc | 9071 | if ( length $j ) { |
69893cff RGS |
9072 | |
9073 | # ... but the line isn't breakable, skip it. | |
e22ea7cc | 9074 | if ( $dbline[$i] == 0 ) { |
69893cff RGS |
9075 | print $OUT "Line $i may not have an action.\n"; |
9076 | } | |
9077 | else { | |
e22ea7cc | 9078 | |
69893cff RGS |
9079 | # ... and the line is breakable: |
9080 | # Mark that there's an action in this file. | |
9081 | $had_breakpoints{$filename} |= 2; | |
9082 | ||
9083 | # Delete any current action. | |
9084 | $dbline{$i} =~ s/\0[^\0]*//; | |
9085 | ||
9086 | # Add the new action, continuing the line as needed. | |
9087 | $dbline{$i} .= "\0" . action($j); | |
9088 | } | |
9089 | } ## end if (length $j) | |
9090 | ||
9091 | # No action supplied. | |
9092 | else { | |
e22ea7cc | 9093 | |
69893cff RGS |
9094 | # Delete the action. |
9095 | $dbline{$i} =~ s/\0[^\0]*//; | |
e22ea7cc RF |
9096 | |
9097 | # Mark as having no break or action if nothing's left. | |
69893cff RGS |
9098 | delete $dbline{$i} if $dbline{$i} eq ''; |
9099 | } | |
9100 | } ## end if ($cmd =~ /^(\d*)\s*(.*)/) | |
9101 | } ## end sub cmd_pre580_a | |
9102 | ||
9103 | =head2 Old C<b> command | |
9104 | ||
9105 | Add breakpoints. | |
9106 | ||
9107 | =cut | |
492652be RF |
9108 | |
9109 | sub cmd_pre580_b { | |
e22ea7cc | 9110 | my $xcmd = shift; |
69893cff RGS |
9111 | my $cmd = shift; |
9112 | my $dbline = shift; | |
9113 | ||
9114 | # Break on load. | |
e22ea7cc | 9115 | if ( $cmd =~ /^load\b\s*(.*)/ ) { |
69893cff RGS |
9116 | my $file = $1; |
9117 | $file =~ s/\s+$//; | |
9118 | &cmd_b_load($file); | |
9119 | } | |
9120 | ||
9121 | # b compile|postpone <some sub> [<condition>] | |
e22ea7cc | 9122 | # The interpreter actually traps this one for us; we just put the |
69893cff | 9123 | # necessary condition in the %postponed hash. |
e22ea7cc RF |
9124 | elsif ( $cmd =~ /^(postpone|compile)\b\s*([':A-Za-z_][':\w]*)\s*(.*)/ ) { |
9125 | ||
69893cff RGS |
9126 | # Capture the condition if there is one. Make it true if none. |
9127 | my $cond = length $3 ? $3 : '1'; | |
9128 | ||
9129 | # Save the sub name and set $break to 1 if $1 was 'postpone', 0 | |
9130 | # if it was 'compile'. | |
e22ea7cc | 9131 | my ( $subname, $break ) = ( $2, $1 eq 'postpone' ); |
69893cff RGS |
9132 | |
9133 | # De-Perl4-ify the name - ' separators to ::. | |
9134 | $subname =~ s/\'/::/g; | |
9135 | ||
9136 | # Qualify it into the current package unless it's already qualified. | |
9137 | $subname = "${'package'}::" . $subname | |
e22ea7cc | 9138 | unless $subname =~ /::/; |
69893cff RGS |
9139 | |
9140 | # Add main if it starts with ::. | |
e22ea7cc | 9141 | $subname = "main" . $subname if substr( $subname, 0, 2 ) eq "::"; |
69893cff RGS |
9142 | |
9143 | # Save the break type for this sub. | |
9144 | $postponed{$subname} = $break ? "break +0 if $cond" : "compile"; | |
9145 | } ## end elsif ($cmd =~ ... | |
e22ea7cc | 9146 | |
69893cff | 9147 | # b <sub name> [<condition>] |
e22ea7cc | 9148 | elsif ( $cmd =~ /^([':A-Za-z_][':\w]*(?:\[.*\])?)\s*(.*)/ ) { |
69893cff RGS |
9149 | my $subname = $1; |
9150 | my $cond = length $2 ? $2 : '1'; | |
e22ea7cc RF |
9151 | &cmd_b_sub( $subname, $cond ); |
9152 | } | |
69893cff RGS |
9153 | |
9154 | # b <line> [<condition>]. | |
e22ea7cc | 9155 | elsif ( $cmd =~ /^(\d*)\s*(.*)/ ) { |
69893cff RGS |
9156 | my $i = $1 || $dbline; |
9157 | my $cond = length $2 ? $2 : '1'; | |
e22ea7cc | 9158 | &cmd_b_line( $i, $cond ); |
69893cff RGS |
9159 | } |
9160 | } ## end sub cmd_pre580_b | |
9161 | ||
9162 | =head2 Old C<D> command. | |
9163 | ||
9164 | Delete all breakpoints unconditionally. | |
9165 | ||
9166 | =cut | |
492652be RF |
9167 | |
9168 | sub cmd_pre580_D { | |
69893cff RGS |
9169 | my $xcmd = shift; |
9170 | my $cmd = shift; | |
e22ea7cc | 9171 | if ( $cmd =~ /^\s*$/ ) { |
69893cff RGS |
9172 | print $OUT "Deleting all breakpoints...\n"; |
9173 | ||
9174 | # %had_breakpoints lists every file that had at least one | |
9175 | # breakpoint in it. | |
9176 | my $file; | |
e22ea7cc RF |
9177 | for $file ( keys %had_breakpoints ) { |
9178 | ||
69893cff | 9179 | # Switch to the desired file temporarily. |
e22ea7cc | 9180 | local *dbline = $main::{ '_<' . $file }; |
69893cff RGS |
9181 | |
9182 | my $max = $#dbline; | |
9183 | my $was; | |
9184 | ||
9185 | # For all lines in this file ... | |
e22ea7cc RF |
9186 | for ( $i = 1 ; $i <= $max ; $i++ ) { |
9187 | ||
69893cff | 9188 | # If there's a breakpoint or action on this line ... |
e22ea7cc RF |
9189 | if ( defined $dbline{$i} ) { |
9190 | ||
69893cff RGS |
9191 | # ... remove the breakpoint. |
9192 | $dbline{$i} =~ s/^[^\0]+//; | |
e22ea7cc RF |
9193 | if ( $dbline{$i} =~ s/^\0?$// ) { |
9194 | ||
69893cff RGS |
9195 | # Remove the entry altogether if no action is there. |
9196 | delete $dbline{$i}; | |
9197 | } | |
9198 | } ## end if (defined $dbline{$i... | |
9199 | } ## end for ($i = 1 ; $i <= $max... | |
9200 | ||
9201 | # If, after we turn off the "there were breakpoints in this file" | |
e22ea7cc | 9202 | # bit, the entry in %had_breakpoints for this file is zero, |
69893cff | 9203 | # we should remove this file from the hash. |
e22ea7cc | 9204 | if ( not $had_breakpoints{$file} &= ~1 ) { |
69893cff RGS |
9205 | delete $had_breakpoints{$file}; |
9206 | } | |
9207 | } ## end for $file (keys %had_breakpoints) | |
9208 | ||
9209 | # Kill off all the other breakpoints that are waiting for files that | |
9210 | # haven't been loaded yet. | |
9211 | undef %postponed; | |
9212 | undef %postponed_file; | |
9213 | undef %break_on_load; | |
9214 | } ## end if ($cmd =~ /^\s*$/) | |
9215 | } ## end sub cmd_pre580_D | |
9216 | ||
9217 | =head2 Old C<h> command | |
9218 | ||
9219 | Print help. Defaults to printing the long-form help; the 5.8 version | |
9220 | prints the summary by default. | |
9221 | ||
9222 | =cut | |
492652be RF |
9223 | |
9224 | sub cmd_pre580_h { | |
69893cff RGS |
9225 | my $xcmd = shift; |
9226 | my $cmd = shift; | |
9227 | ||
9228 | # Print the *right* help, long format. | |
e22ea7cc | 9229 | if ( $cmd =~ /^\s*$/ ) { |
69893cff RGS |
9230 | print_help($pre580_help); |
9231 | } | |
9232 | ||
e22ea7cc RF |
9233 | # 'h h' - explicitly-requested summary. |
9234 | elsif ( $cmd =~ /^h\s*/ ) { | |
69893cff RGS |
9235 | print_help($pre580_summary); |
9236 | } | |
9237 | ||
9238 | # Find and print a command's help. | |
e22ea7cc RF |
9239 | elsif ( $cmd =~ /^h\s+(\S.*)$/ ) { |
9240 | my $asked = $1; # for proper errmsg | |
9241 | my $qasked = quotemeta($asked); # for searching | |
9242 | # XXX: finds CR but not <CR> | |
9243 | if ( | |
9244 | $pre580_help =~ /^ | |
69893cff RGS |
9245 | <? # Optional '<' |
9246 | (?:[IB]<) # Optional markup | |
9247 | $qasked # The command name | |
e22ea7cc RF |
9248 | /mx |
9249 | ) | |
9250 | { | |
69893cff RGS |
9251 | |
9252 | while ( | |
9253 | $pre580_help =~ /^ | |
9254 | ( # The command help: | |
9255 | <? # Optional '<' | |
9256 | (?:[IB]<) # Optional markup | |
9257 | $qasked # The command name | |
9258 | ([\s\S]*?) # Lines starting with tabs | |
9259 | \n # Final newline | |
9260 | ) | |
e22ea7cc RF |
9261 | (?!\s)/mgx |
9262 | ) # Line not starting with space | |
9263 | # (Next command's help) | |
69893cff RGS |
9264 | { |
9265 | print_help($1); | |
9266 | } | |
9267 | } ## end if ($pre580_help =~ /^<?(?:[IB]<)$qasked/m) | |
9268 | ||
9269 | # Help not found. | |
9270 | else { | |
9271 | print_help("B<$asked> is not a debugger command.\n"); | |
9272 | } | |
9273 | } ## end elsif ($cmd =~ /^h\s+(\S.*)$/) | |
9274 | } ## end sub cmd_pre580_h | |
9275 | ||
9276 | =head2 Old C<W> command | |
9277 | ||
9278 | C<W E<lt>exprE<gt>> adds a watch expression, C<W> deletes them all. | |
9279 | ||
9280 | =cut | |
492652be RF |
9281 | |
9282 | sub cmd_pre580_W { | |
69893cff RGS |
9283 | my $xcmd = shift; |
9284 | my $cmd = shift; | |
9285 | ||
9286 | # Delete all watch expressions. | |
e22ea7cc RF |
9287 | if ( $cmd =~ /^$/ ) { |
9288 | ||
69893cff RGS |
9289 | # No watching is going on. |
9290 | $trace &= ~2; | |
e22ea7cc | 9291 | |
69893cff RGS |
9292 | # Kill all the watch expressions and values. |
9293 | @to_watch = @old_watch = (); | |
9294 | } | |
9295 | ||
9296 | # Add a watch expression. | |
e22ea7cc RF |
9297 | elsif ( $cmd =~ /^(.*)/s ) { |
9298 | ||
69893cff RGS |
9299 | # add it to the list to be watched. |
9300 | push @to_watch, $1; | |
9301 | ||
e22ea7cc | 9302 | # Get the current value of the expression. |
69893cff RGS |
9303 | # Doesn't handle expressions returning list values! |
9304 | $evalarg = $1; | |
9305 | my ($val) = &eval; | |
e22ea7cc | 9306 | $val = ( defined $val ) ? "'$val'" : 'undef'; |
69893cff RGS |
9307 | |
9308 | # Save it. | |
9309 | push @old_watch, $val; | |
9310 | ||
9311 | # We're watching stuff. | |
9312 | $trace |= 2; | |
9313 | ||
9314 | } ## end elsif ($cmd =~ /^(.*)/s) | |
9315 | } ## end sub cmd_pre580_W | |
9316 | ||
9317 | =head1 PRE-AND-POST-PROMPT COMMANDS AND ACTIONS | |
9318 | ||
9319 | The debugger used to have a bunch of nearly-identical code to handle | |
9320 | the pre-and-post-prompt action commands. C<cmd_pre590_prepost> and | |
9321 | C<cmd_prepost> unify all this into one set of code to handle the | |
9322 | appropriate actions. | |
9323 | ||
9324 | =head2 C<cmd_pre590_prepost> | |
9325 | ||
9326 | A small wrapper around C<cmd_prepost>; it makes sure that the default doesn't | |
9327 | do something destructive. In pre 5.8 debuggers, the default action was to | |
9328 | delete all the actions. | |
9329 | ||
9330 | =cut | |
492652be | 9331 | |
35408c4e | 9332 | sub cmd_pre590_prepost { |
69893cff RGS |
9333 | my $cmd = shift; |
9334 | my $line = shift || '*'; | |
9335 | my $dbline = shift; | |
35408c4e | 9336 | |
69893cff RGS |
9337 | return &cmd_prepost( $cmd, $line, $dbline ); |
9338 | } ## end sub cmd_pre590_prepost | |
eda6e075 | 9339 | |
69893cff RGS |
9340 | =head2 C<cmd_prepost> |
9341 | ||
be9a9b1d | 9342 | Actually does all the handling for C<E<lt>>, C<E<gt>>, C<{{>, C<{>, etc. |
69893cff RGS |
9343 | Since the lists of actions are all held in arrays that are pointed to by |
9344 | references anyway, all we have to do is pick the right array reference and | |
9345 | then use generic code to all, delete, or list actions. | |
9346 | ||
9347 | =cut | |
9348 | ||
e22ea7cc RF |
9349 | sub cmd_prepost { |
9350 | my $cmd = shift; | |
69893cff RGS |
9351 | |
9352 | # No action supplied defaults to 'list'. | |
e22ea7cc RF |
9353 | my $line = shift || '?'; |
9354 | ||
9355 | # Figure out what to put in the prompt. | |
69893cff RGS |
9356 | my $which = ''; |
9357 | ||
9358 | # Make sure we have some array or another to address later. | |
9359 | # This means that if ssome reason the tests fail, we won't be | |
9360 | # trying to stash actions or delete them from the wrong place. | |
e22ea7cc | 9361 | my $aref = []; |
69893cff | 9362 | |
e22ea7cc | 9363 | # < - Perl code to run before prompt. |
69893cff RGS |
9364 | if ( $cmd =~ /^\</o ) { |
9365 | $which = 'pre-perl'; | |
9366 | $aref = $pre; | |
9367 | } | |
9368 | ||
9369 | # > - Perl code to run after prompt. | |
9370 | elsif ( $cmd =~ /^\>/o ) { | |
9371 | $which = 'post-perl'; | |
9372 | $aref = $post; | |
9373 | } | |
9374 | ||
9375 | # { - first check for properly-balanced braces. | |
9376 | elsif ( $cmd =~ /^\{/o ) { | |
9377 | if ( $cmd =~ /^\{.*\}$/o && unbalanced( substr( $cmd, 1 ) ) ) { | |
9378 | print $OUT | |
9379 | "$cmd is now a debugger command\nuse `;$cmd' if you mean Perl code\n"; | |
9380 | } | |
9381 | ||
9382 | # Properly balanced. Pre-prompt debugger actions. | |
9383 | else { | |
9384 | $which = 'pre-debugger'; | |
9385 | $aref = $pretype; | |
9386 | } | |
9387 | } ## end elsif ( $cmd =~ /^\{/o ) | |
9388 | ||
9389 | # Did we find something that makes sense? | |
9390 | unless ($which) { | |
9391 | print $OUT "Confused by command: $cmd\n"; | |
9392 | } | |
9393 | ||
e22ea7cc | 9394 | # Yes. |
69893cff | 9395 | else { |
e22ea7cc | 9396 | |
69893cff RGS |
9397 | # List actions. |
9398 | if ( $line =~ /^\s*\?\s*$/o ) { | |
9399 | unless (@$aref) { | |
e22ea7cc | 9400 | |
69893cff RGS |
9401 | # Nothing there. Complain. |
9402 | print $OUT "No $which actions.\n"; | |
9403 | } | |
9404 | else { | |
e22ea7cc | 9405 | |
69893cff RGS |
9406 | # List the actions in the selected list. |
9407 | print $OUT "$which commands:\n"; | |
9408 | foreach my $action (@$aref) { | |
9409 | print $OUT "\t$cmd -- $action\n"; | |
9410 | } | |
9411 | } ## end else | |
9412 | } ## end if ( $line =~ /^\s*\?\s*$/o) | |
9413 | ||
9414 | # Might be a delete. | |
9415 | else { | |
9416 | if ( length($cmd) == 1 ) { | |
9417 | if ( $line =~ /^\s*\*\s*$/o ) { | |
e22ea7cc RF |
9418 | |
9419 | # It's a delete. Get rid of the old actions in the | |
69893cff RGS |
9420 | # selected list.. |
9421 | @$aref = (); | |
9422 | print $OUT "All $cmd actions cleared.\n"; | |
9423 | } | |
9424 | else { | |
e22ea7cc | 9425 | |
69893cff RGS |
9426 | # Replace all the actions. (This is a <, >, or {). |
9427 | @$aref = action($line); | |
9428 | } | |
9429 | } ## end if ( length($cmd) == 1) | |
e22ea7cc RF |
9430 | elsif ( length($cmd) == 2 ) { |
9431 | ||
69893cff RGS |
9432 | # Add the action to the line. (This is a <<, >>, or {{). |
9433 | push @$aref, action($line); | |
9434 | } | |
9435 | else { | |
e22ea7cc | 9436 | |
69893cff RGS |
9437 | # <<<, >>>>, {{{{{{ ... something not a command. |
9438 | print $OUT | |
9439 | "Confused by strange length of $which command($cmd)...\n"; | |
9440 | } | |
9441 | } ## end else [ if ( $line =~ /^\s*\?\s*$/o) | |
9442 | } ## end else | |
9443 | } ## end sub cmd_prepost | |
9444 | ||
69893cff RGS |
9445 | =head1 C<DB::fake> |
9446 | ||
9447 | Contains the C<at_exit> routine that the debugger uses to issue the | |
9448 | C<Debugged program terminated ...> message after the program completes. See | |
9449 | the C<END> block documentation for more details. | |
9450 | ||
9451 | =cut | |
35408c4e | 9452 | |
55497cff | 9453 | package DB::fake; |
9454 | ||
9455 | sub at_exit { | |
e22ea7cc | 9456 | "Debugged program terminated. Use `q' to quit or `R' to restart."; |
55497cff | 9457 | } |
9458 | ||
69893cff | 9459 | package DB; # Do not trace this 1; below! |
36477c24 | 9460 | |
d338d6fe | 9461 | 1; |
69893cff | 9462 | |
7fddc82f | 9463 |