Commit | Line | Data |
---|---|---|
4633a7c4 | 1 | package diagnostics; |
4633a7c4 LW |
2 | |
3 | =head1 NAME | |
4 | ||
c7bcd97d | 5 | diagnostics, splain - produce verbose warning diagnostics |
4633a7c4 LW |
6 | |
7 | =head1 SYNOPSIS | |
8 | ||
c7bcd97d | 9 | Using the C<diagnostics> pragma: |
4633a7c4 LW |
10 | |
11 | use diagnostics; | |
12 | use diagnostics -verbose; | |
13 | ||
14 | enable diagnostics; | |
15 | disable diagnostics; | |
16 | ||
c7bcd97d | 17 | Using the C<splain> standalone filter program: |
4633a7c4 LW |
18 | |
19 | perl program 2>diag.out | |
20 | splain [-v] [-p] diag.out | |
21 | ||
58618f23 FD |
22 | Using diagnostics to get stack traces from a misbehaving script: |
23 | ||
24 | perl -Mdiagnostics=-traceonly my_script.pl | |
25 | ||
4633a7c4 LW |
26 | =head1 DESCRIPTION |
27 | ||
28 | =head2 The C<diagnostics> Pragma | |
29 | ||
30 | This module extends the terse diagnostics normally emitted by both the | |
c411974d SP |
31 | perl compiler and the perl interpreter (from running perl with a -w |
32 | switch or C<use warnings>), augmenting them with the more | |
4633a7c4 | 33 | explicative and endearing descriptions found in L<perldiag>. Like the |
1fef88e7 | 34 | other pragmata, it affects the compilation phase of your program rather |
4633a7c4 LW |
35 | than merely the execution phase. |
36 | ||
37 | To use in your program as a pragma, merely invoke | |
38 | ||
39 | use diagnostics; | |
40 | ||
41 | at the start (or near the start) of your program. (Note | |
42 | that this I<does> enable perl's B<-w> flag.) Your whole | |
43 | compilation will then be subject(ed :-) to the enhanced diagnostics. | |
44 | These still go out B<STDERR>. | |
45 | ||
ae2c041d | 46 | Due to the interaction between runtime and compiletime issues, |
4633a7c4 | 47 | and because it's probably not a very good idea anyway, |
ae2c041d | 48 | you may not use C<no diagnostics> to turn them off at compiletime. |
3d0ae7ba | 49 | However, you may control their behaviour at runtime using the |
4633a7c4 LW |
50 | disable() and enable() methods to turn them off and on respectively. |
51 | ||
52 | The B<-verbose> flag first prints out the L<perldiag> introduction before | |
1fef88e7 JM |
53 | any other diagnostics. The $diagnostics::PRETTY variable can generate nicer |
54 | escape sequences for pagers. | |
4633a7c4 | 55 | |
097b73fc BB |
56 | Warnings dispatched from perl itself (or more accurately, those that match |
57 | descriptions found in L<perldiag>) are only displayed once (no duplicate | |
49704364 | 58 | descriptions). User code generated warnings a la warn() are unaffected, |
097b73fc BB |
59 | allowing duplicate user messages to be displayed. |
60 | ||
58618f23 FD |
61 | This module also adds a stack trace to the error message when perl dies. |
62 | This is useful for pinpointing what caused the death. The B<-traceonly> (or | |
3c4b39be | 63 | just B<-t>) flag turns off the explanations of warning messages leaving just |
58618f23 FD |
64 | the stack traces. So if your script is dieing, run it again with |
65 | ||
66 | perl -Mdiagnostics=-traceonly my_bad_script | |
67 | ||
68 | to see the call stack at the time of death. By supplying the B<-warntrace> | |
69 | (or just B<-w>) flag, any warnings emitted will also come with a stack | |
70 | trace. | |
71 | ||
4633a7c4 LW |
72 | =head2 The I<splain> Program |
73 | ||
74 | While apparently a whole nuther program, I<splain> is actually nothing | |
75 | more than a link to the (executable) F<diagnostics.pm> module, as well as | |
76 | a link to the F<diagnostics.pod> documentation. The B<-v> flag is like | |
77 | the C<use diagnostics -verbose> directive. | |
78 | The B<-p> flag is like the | |
79 | $diagnostics::PRETTY variable. Since you're post-processing with | |
80 | I<splain>, there's no sense in being able to enable() or disable() processing. | |
81 | ||
82 | Output from I<splain> is directed to B<STDOUT>, unlike the pragma. | |
83 | ||
84 | =head1 EXAMPLES | |
85 | ||
86 | The following file is certain to trigger a few errors at both | |
ae2c041d | 87 | runtime and compiletime: |
4633a7c4 LW |
88 | |
89 | use diagnostics; | |
90 | print NOWHERE "nothing\n"; | |
91 | print STDERR "\n\tThis message should be unadorned.\n"; | |
92 | warn "\tThis is a user warning"; | |
93 | print "\nDIAGNOSTIC TESTER: Please enter a <CR> here: "; | |
94 | my $a, $b = scalar <STDIN>; | |
95 | print "\n"; | |
96 | print $x/$y; | |
97 | ||
98 | If you prefer to run your program first and look at its problem | |
99 | afterwards, do this: | |
100 | ||
101 | perl -w test.pl 2>test.out | |
102 | ./splain < test.out | |
103 | ||
104 | Note that this is not in general possible in shells of more dubious heritage, | |
1fef88e7 | 105 | as the theoretical |
4633a7c4 LW |
106 | |
107 | (perl -w test.pl >/dev/tty) >& test.out | |
108 | ./splain < test.out | |
109 | ||
110 | Because you just moved the existing B<stdout> to somewhere else. | |
111 | ||
112 | If you don't want to modify your source code, but still have on-the-fly | |
113 | warnings, do this: | |
114 | ||
115 | exec 3>&1; perl -w test.pl 2>&1 1>&3 3>&- | splain 1>&2 3>&- | |
116 | ||
117 | Nifty, eh? | |
118 | ||
119 | If you want to control warnings on the fly, do something like this. | |
120 | Make sure you do the C<use> first, or you won't be able to get | |
121 | at the enable() or disable() methods. | |
122 | ||
123 | use diagnostics; # checks entire compilation phase | |
124 | print "\ntime for 1st bogus diags: SQUAWKINGS\n"; | |
125 | print BOGUS1 'nada'; | |
126 | print "done with 1st bogus\n"; | |
127 | ||
128 | disable diagnostics; # only turns off runtime warnings | |
129 | print "\ntime for 2nd bogus: (squelched)\n"; | |
130 | print BOGUS2 'nada'; | |
131 | print "done with 2nd bogus\n"; | |
132 | ||
133 | enable diagnostics; # turns back on runtime warnings | |
134 | print "\ntime for 3rd bogus: SQUAWKINGS\n"; | |
135 | print BOGUS3 'nada'; | |
136 | print "done with 3rd bogus\n"; | |
137 | ||
138 | disable diagnostics; | |
139 | print "\ntime for 4th bogus: (squelched)\n"; | |
140 | print BOGUS4 'nada'; | |
141 | print "done with 4th bogus\n"; | |
142 | ||
143 | =head1 INTERNALS | |
144 | ||
145 | Diagnostic messages derive from the F<perldiag.pod> file when available at | |
146 | runtime. Otherwise, they may be embedded in the file itself when the | |
147 | splain package is built. See the F<Makefile> for details. | |
148 | ||
149 | If an extant $SIG{__WARN__} handler is discovered, it will continue | |
1fef88e7 | 150 | to be honored, but only after the diagnostics::splainthis() function |
4633a7c4 LW |
151 | (the module's $SIG{__WARN__} interceptor) has had its way with your |
152 | warnings. | |
153 | ||
154 | There is a $diagnostics::DEBUG variable you may set if you're desperately | |
155 | curious what sorts of things are being intercepted. | |
156 | ||
157 | BEGIN { $diagnostics::DEBUG = 1 } | |
158 | ||
159 | ||
160 | =head1 BUGS | |
161 | ||
162 | Not being able to say "no diagnostics" is annoying, but may not be | |
163 | insurmountable. | |
164 | ||
165 | The C<-pretty> directive is called too late to affect matters. | |
864e1151 | 166 | You have to do this instead, and I<before> you load the module. |
4633a7c4 LW |
167 | |
168 | BEGIN { $diagnostics::PRETTY = 1 } | |
169 | ||
170 | I could start up faster by delaying compilation until it should be | |
a6006777 | 171 | needed, but this gets a "panic: top_level" when using the pragma form |
172 | in Perl 5.001e. | |
4633a7c4 LW |
173 | |
174 | While it's true that this documentation is somewhat subserious, if you use | |
175 | a program named I<splain>, you should expect a bit of whimsy. | |
176 | ||
177 | =head1 AUTHOR | |
178 | ||
352854fa | 179 | Tom Christiansen <F<tchrist@mox.perl.com>>, 25 June 1995. |
4633a7c4 LW |
180 | |
181 | =cut | |
182 | ||
7a4340ed | 183 | use strict; |
3b825e41 | 184 | use 5.006; |
5f05dabc | 185 | use Carp; |
58618f23 | 186 | $Carp::Internal{__PACKAGE__.""}++; |
5f05dabc | 187 | |
98225a64 | 188 | our $VERSION = 1.15; |
7a4340ed GS |
189 | our $DEBUG; |
190 | our $VERBOSE; | |
191 | our $PRETTY; | |
58618f23 FD |
192 | our $TRACEONLY = 0; |
193 | our $WARNTRACE = 0; | |
1e4e2d84 | 194 | |
5f05dabc | 195 | use Config; |
7a4340ed | 196 | my($privlib, $archlib) = @Config{qw(privlibexp archlibexp)}; |
5f05dabc | 197 | if ($^O eq 'VMS') { |
91a06757 CS |
198 | require VMS::Filespec; |
199 | $privlib = VMS::Filespec::unixify($privlib); | |
200 | $archlib = VMS::Filespec::unixify($archlib); | |
5f05dabc | 201 | } |
7a4340ed | 202 | my @trypod = ( |
7ec2cea4 | 203 | "$archlib/pod/perldiag.pod", |
0ff3fa1a | 204 | "$privlib/pod/perldiag-$Config{version}.pod", |
5459498c | 205 | "$privlib/pod/perldiag.pod", |
7ec2cea4 | 206 | "$archlib/pods/perldiag.pod", |
0ff3fa1a | 207 | "$privlib/pods/perldiag-$Config{version}.pod", |
5459498c | 208 | "$privlib/pods/perldiag.pod", |
7ec2cea4 | 209 | ); |
fb73857a | 210 | # handy for development testing of new warnings etc |
211 | unshift @trypod, "./pod/perldiag.pod" if -e "pod/perldiag.pod"; | |
7a4340ed | 212 | (my $PODFILE) = ((grep { -e } @trypod), $trypod[$#trypod])[0]; |
5f05dabc | 213 | |
95e8664e CN |
214 | if ($^O eq 'MacOS') { |
215 | # just updir one from each lib dir, we'll find it ... | |
216 | ($PODFILE) = grep { -e } map { "$_:pod:perldiag.pod" } @INC; | |
217 | } | |
218 | ||
219 | ||
4633a7c4 LW |
220 | $DEBUG ||= 0; |
221 | my $WHOAMI = ref bless []; # nobody's business, prolly not even mine | |
222 | ||
7a4340ed | 223 | local $| = 1; |
4633a7c4 LW |
224 | local $_; |
225 | ||
7a4340ed GS |
226 | my $standalone; |
227 | my(%HTML_2_Troff, %HTML_2_Latin_1, %HTML_2_ASCII_7); | |
228 | ||
4633a7c4 | 229 | CONFIG: { |
7a4340ed | 230 | our $opt_p = our $opt_d = our $opt_v = our $opt_f = ''; |
4633a7c4 | 231 | |
7a4340ed | 232 | unless (caller) { |
4633a7c4 LW |
233 | $standalone++; |
234 | require Getopt::Std; | |
91a06757 CS |
235 | Getopt::Std::getopts('pdvf:') |
236 | or die "Usage: $0 [-v] [-p] [-f splainpod]"; | |
4633a7c4 LW |
237 | $PODFILE = $opt_f if $opt_f; |
238 | $DEBUG = 2 if $opt_d; | |
239 | $VERBOSE = $opt_v; | |
240 | $PRETTY = $opt_p; | |
7a4340ed | 241 | } |
4633a7c4 LW |
242 | |
243 | if (open(POD_DIAG, $PODFILE)) { | |
244 | warn "Happy happy podfile from real $PODFILE\n" if $DEBUG; | |
245 | last CONFIG; | |
246 | } | |
247 | ||
248 | if (caller) { | |
249 | INCPATH: { | |
7a4340ed | 250 | for my $file ( (map { "$_/$WHOAMI.pm" } @INC), $0) { |
4633a7c4 LW |
251 | warn "Checking $file\n" if $DEBUG; |
252 | if (open(POD_DIAG, $file)) { | |
253 | while (<POD_DIAG>) { | |
7a4340ed GS |
254 | next unless |
255 | /^__END__\s*# wish diag dbase were more accessible/; | |
4633a7c4 LW |
256 | print STDERR "podfile is $file\n" if $DEBUG; |
257 | last INCPATH; | |
258 | } | |
259 | } | |
260 | } | |
261 | } | |
262 | } else { | |
263 | print STDERR "podfile is <DATA>\n" if $DEBUG; | |
264 | *POD_DIAG = *main::DATA; | |
265 | } | |
266 | } | |
267 | if (eof(POD_DIAG)) { | |
268 | die "couldn't find diagnostic data in $PODFILE @INC $0"; | |
269 | } | |
270 | ||
271 | ||
272 | %HTML_2_Troff = ( | |
273 | 'amp' => '&', # ampersand | |
274 | 'lt' => '<', # left chevron, less-than | |
275 | 'gt' => '>', # right chevron, greater-than | |
276 | 'quot' => '"', # double quote | |
277 | ||
278 | "Aacute" => "A\\*'", # capital A, acute accent | |
279 | # etc | |
280 | ||
281 | ); | |
282 | ||
283 | %HTML_2_Latin_1 = ( | |
284 | 'amp' => '&', # ampersand | |
285 | 'lt' => '<', # left chevron, less-than | |
286 | 'gt' => '>', # right chevron, greater-than | |
287 | 'quot' => '"', # double quote | |
288 | ||
289 | "Aacute" => "\xC1" # capital A, acute accent | |
290 | ||
291 | # etc | |
292 | ); | |
293 | ||
294 | %HTML_2_ASCII_7 = ( | |
295 | 'amp' => '&', # ampersand | |
296 | 'lt' => '<', # left chevron, less-than | |
297 | 'gt' => '>', # right chevron, greater-than | |
298 | 'quot' => '"', # double quote | |
299 | ||
300 | "Aacute" => "A" # capital A, acute accent | |
301 | # etc | |
302 | ); | |
303 | ||
7a4340ed | 304 | our %HTML_Escapes; |
4633a7c4 LW |
305 | *HTML_Escapes = do { |
306 | if ($standalone) { | |
307 | $PRETTY ? \%HTML_2_Latin_1 : \%HTML_2_ASCII_7; | |
308 | } else { | |
309 | \%HTML_2_Latin_1; | |
310 | } | |
311 | }; | |
312 | ||
313 | *THITHER = $standalone ? *STDOUT : *STDERR; | |
314 | ||
49704364 | 315 | my %transfmt = (); |
7a4340ed | 316 | my $transmo = <<EOFUNC; |
4633a7c4 | 317 | sub transmo { |
599cee73 | 318 | #local \$^W = 0; # recursive warnings we do NOT need! |
4633a7c4 LW |
319 | study; |
320 | EOFUNC | |
321 | ||
7a4340ed GS |
322 | my %msg; |
323 | { | |
4633a7c4 | 324 | print STDERR "FINISHING COMPILATION for $_\n" if $DEBUG; |
7a4340ed | 325 | local $/ = ''; |
4633a7c4 | 326 | local $_; |
7a4340ed GS |
327 | my $header; |
328 | my $for_item; | |
4633a7c4 | 329 | while (<POD_DIAG>) { |
4633a7c4 LW |
330 | |
331 | unescape(); | |
332 | if ($PRETTY) { | |
333 | sub noop { return $_[0] } # spensive for a noop | |
334 | sub bold { my $str =$_[0]; $str =~ s/(.)/$1\b$1/g; return $str; } | |
335 | sub italic { my $str = $_[0]; $str =~ s/(.)/_\b$1/g; return $str; } | |
67612b68 | 336 | s/C<<< (.*?) >>>|C<< (.*?) >>|[BC]<(.*?)>/bold($+)/ges; |
4633a7c4 LW |
337 | s/[LIF]<(.*?)>/italic($1)/ges; |
338 | } else { | |
67612b68 | 339 | s/C<<< (.*?) >>>|C<< (.*?) >>|[BC]<(.*?)>/$+/gs; |
4633a7c4 LW |
340 | s/[LIF]<(.*?)>/$1/gs; |
341 | } | |
342 | unless (/^=/) { | |
343 | if (defined $header) { | |
344 | if ( $header eq 'DESCRIPTION' && | |
345 | ( /Optional warnings are enabled/ | |
346 | || /Some of these messages are generic./ | |
347 | ) ) | |
348 | { | |
349 | next; | |
49704364 | 350 | } |
4633a7c4 LW |
351 | s/^/ /gm; |
352 | $msg{$header} .= $_; | |
7a4340ed | 353 | undef $for_item; |
4633a7c4 LW |
354 | } |
355 | next; | |
356 | } | |
7a4340ed | 357 | unless ( s/=item (.*?)\s*\z//) { |
4633a7c4 LW |
358 | |
359 | if ( s/=head1\sDESCRIPTION//) { | |
360 | $msg{$header = 'DESCRIPTION'} = ''; | |
7a4340ed | 361 | undef $for_item; |
4633a7c4 | 362 | } |
7a4340ed GS |
363 | elsif( s/^=for\s+diagnostics\s*\n(.*?)\s*\z// ) { |
364 | $for_item = $1; | |
365 | } | |
4633a7c4 LW |
366 | next; |
367 | } | |
4fdae800 | 368 | |
5cd5c422 RB |
369 | if( $for_item ) { $header = $for_item; undef $for_item } |
370 | else { | |
371 | $header = $1; | |
372 | while( $header =~ /[;,]\z/ ) { | |
373 | <POD_DIAG> =~ /^\s*(.*?)\s*\z/; | |
374 | $header .= ' '.$1; | |
375 | } | |
376 | } | |
377 | ||
49704364 | 378 | # strip formatting directives from =item line |
7a4340ed | 379 | $header =~ s/[A-Z]<(.*?)>/$1/g; |
4633a7c4 | 380 | |
49704364 WL |
381 | my @toks = split( /(%l?[dx]|%c|%(?:\.\d+)?s)/, $header ); |
382 | if (@toks > 1) { | |
383 | my $conlen = 0; | |
384 | for my $i (0..$#toks){ | |
385 | if( $i % 2 ){ | |
386 | if( $toks[$i] eq '%c' ){ | |
387 | $toks[$i] = '.'; | |
388 | } elsif( $toks[$i] eq '%d' ){ | |
389 | $toks[$i] = '\d+'; | |
390 | } elsif( $toks[$i] eq '%s' ){ | |
391 | $toks[$i] = $i == $#toks ? '.*' : '.*?'; | |
392 | } elsif( $toks[$i] =~ '%.(\d+)s' ){ | |
393 | $toks[$i] = ".{$1}"; | |
394 | } elsif( $toks[$i] =~ '^%l*x$' ){ | |
395 | $toks[$i] = '[\da-f]+'; | |
396 | } | |
397 | } elsif( length( $toks[$i] ) ){ | |
398 | $toks[$i] =~ s/^.*$/\Q$&\E/; | |
399 | $conlen += length( $toks[$i] ); | |
400 | } | |
401 | } | |
402 | my $lhs = join( '', @toks ); | |
403 | $transfmt{$header}{pat} = | |
404 | " s{^$lhs}\n {\Q$header\E}s\n\t&& return 1;\n"; | |
405 | $transfmt{$header}{len} = $conlen; | |
4633a7c4 | 406 | } else { |
49704364 WL |
407 | $transfmt{$header}{pat} = |
408 | " m{^\Q$header\E} && return 1;\n"; | |
409 | $transfmt{$header}{len} = length( $header ); | |
4633a7c4 LW |
410 | } |
411 | ||
eff9c6e2 CS |
412 | print STDERR "$WHOAMI: Duplicate entry: \"$header\"\n" |
413 | if $msg{$header}; | |
4633a7c4 LW |
414 | |
415 | $msg{$header} = ''; | |
416 | } | |
417 | ||
418 | ||
419 | close POD_DIAG unless *main::DATA eq *POD_DIAG; | |
420 | ||
421 | die "No diagnostics?" unless %msg; | |
422 | ||
49704364 WL |
423 | # Apply patterns in order of decreasing sum of lengths of fixed parts |
424 | # Seems the best way of hitting the right one. | |
425 | for my $hdr ( sort { $transfmt{$b}{len} <=> $transfmt{$a}{len} } | |
426 | keys %transfmt ){ | |
427 | $transmo .= $transfmt{$hdr}{pat}; | |
428 | } | |
4633a7c4 LW |
429 | $transmo .= " return 0;\n}\n"; |
430 | print STDERR $transmo if $DEBUG; | |
431 | eval $transmo; | |
432 | die $@ if $@; | |
7a4340ed | 433 | } |
4633a7c4 LW |
434 | |
435 | if ($standalone) { | |
436 | if (!@ARGV and -t STDIN) { print STDERR "$0: Reading from STDIN\n" } | |
7a4340ed | 437 | while (defined (my $error = <>)) { |
4633a7c4 LW |
438 | splainthis($error) || print THITHER $error; |
439 | } | |
440 | exit; | |
7a4340ed GS |
441 | } |
442 | ||
443 | my $olddie; | |
444 | my $oldwarn; | |
4633a7c4 LW |
445 | |
446 | sub import { | |
447 | shift; | |
7a4340ed GS |
448 | $^W = 1; # yup, clobbered the global variable; |
449 | # tough, if you want diags, you want diags. | |
0dc02ca5 | 450 | return if defined $SIG{__WARN__} && ($SIG{__WARN__} eq \&warn_trap); |
4633a7c4 LW |
451 | |
452 | for (@_) { | |
453 | ||
454 | /^-d(ebug)?$/ && do { | |
455 | $DEBUG++; | |
456 | next; | |
457 | }; | |
458 | ||
459 | /^-v(erbose)?$/ && do { | |
460 | $VERBOSE++; | |
461 | next; | |
462 | }; | |
463 | ||
464 | /^-p(retty)?$/ && do { | |
465 | print STDERR "$0: I'm afraid it's too late for prettiness.\n"; | |
466 | $PRETTY++; | |
467 | next; | |
468 | }; | |
469 | ||
58618f23 FD |
470 | /^-t(race)?$/ && do { |
471 | $TRACEONLY++; | |
472 | next; | |
473 | }; | |
474 | /^-w(arntrace)?$/ && do { | |
475 | $WARNTRACE++; | |
476 | next; | |
477 | }; | |
478 | ||
4633a7c4 LW |
479 | warn "Unknown flag: $_"; |
480 | } | |
481 | ||
482 | $oldwarn = $SIG{__WARN__}; | |
483 | $olddie = $SIG{__DIE__}; | |
484 | $SIG{__WARN__} = \&warn_trap; | |
485 | $SIG{__DIE__} = \&death_trap; | |
486 | } | |
487 | ||
488 | sub enable { &import } | |
489 | ||
490 | sub disable { | |
491 | shift; | |
4633a7c4 | 492 | return unless $SIG{__WARN__} eq \&warn_trap; |
3d0ae7ba GS |
493 | $SIG{__WARN__} = $oldwarn || ''; |
494 | $SIG{__DIE__} = $olddie || ''; | |
4633a7c4 LW |
495 | } |
496 | ||
497 | sub warn_trap { | |
498 | my $warning = $_[0]; | |
499 | if (caller eq $WHOAMI or !splainthis($warning)) { | |
58618f23 FD |
500 | if ($WARNTRACE) { |
501 | print STDERR Carp::longmess($warning); | |
502 | } else { | |
503 | print STDERR $warning; | |
504 | } | |
4633a7c4 | 505 | } |
58618f23 | 506 | goto &$oldwarn if defined $oldwarn and $oldwarn and $oldwarn ne \&warn_trap; |
4633a7c4 LW |
507 | }; |
508 | ||
509 | sub death_trap { | |
510 | my $exception = $_[0]; | |
55497cff | 511 | |
512 | # See if we are coming from anywhere within an eval. If so we don't | |
513 | # want to explain the exception because it's going to get caught. | |
514 | my $in_eval = 0; | |
515 | my $i = 0; | |
58618f23 | 516 | while (my $caller = (caller($i++))[3]) { |
55497cff | 517 | if ($caller eq '(eval)') { |
518 | $in_eval = 1; | |
519 | last; | |
520 | } | |
521 | } | |
522 | ||
523 | splainthis($exception) unless $in_eval; | |
4633a7c4 | 524 | if (caller eq $WHOAMI) { print STDERR "INTERNAL EXCEPTION: $exception"; } |
37120919 | 525 | &$olddie if defined $olddie and $olddie and $olddie ne \&death_trap; |
55497cff | 526 | |
d23f0205 MS |
527 | return if $in_eval; |
528 | ||
55497cff | 529 | # We don't want to unset these if we're coming from an eval because |
d23f0205 MS |
530 | # then we've turned off diagnostics. |
531 | ||
532 | # Switch off our die/warn handlers so we don't wind up in our own | |
533 | # traps. | |
534 | $SIG{__DIE__} = $SIG{__WARN__} = ''; | |
535 | ||
536 | # Have carp skip over death_trap() when showing the stack trace. | |
6f48387a | 537 | local($Carp::CarpLevel) = 1; |
d23f0205 | 538 | |
6f48387a | 539 | confess "Uncaught exception from user code:\n\t$exception"; |
4633a7c4 LW |
540 | # up we go; where we stop, nobody knows, but i think we die now |
541 | # but i'm deeply afraid of the &$olddie guy reraising and us getting | |
542 | # into an indirect recursion loop | |
543 | }; | |
544 | ||
7a4340ed GS |
545 | my %exact_duplicate; |
546 | my %old_diag; | |
547 | my $count; | |
548 | my $wantspace; | |
4633a7c4 | 549 | sub splainthis { |
58618f23 | 550 | return 0 if $TRACEONLY; |
4633a7c4 | 551 | local $_ = shift; |
5025c45a | 552 | local $\; |
4633a7c4 LW |
553 | ### &finish_compilation unless %msg; |
554 | s/\.?\n+$//; | |
555 | my $orig = $_; | |
556 | # return unless defined; | |
49704364 WL |
557 | |
558 | # get rid of the where-are-we-in-input part | |
4633a7c4 | 559 | s/, <.*?> (?:line|chunk).*$//; |
49704364 WL |
560 | |
561 | # Discard 1st " at <file> line <no>" and all text beyond | |
562 | # but be aware of messsages containing " at this-or-that" | |
563 | my $real = 0; | |
564 | my @secs = split( / at / ); | |
565 | $_ = $secs[0]; | |
566 | for my $i ( 1..$#secs ){ | |
567 | if( $secs[$i] =~ /.+? (?:line|chunk) \d+/ ){ | |
568 | $real = 1; | |
569 | last; | |
570 | } else { | |
571 | $_ .= ' at ' . $secs[$i]; | |
572 | } | |
573 | } | |
574 | ||
575 | # remove parenthesis occurring at the end of some messages | |
4633a7c4 | 576 | s/^\((.*)\)$/$1/; |
49704364 | 577 | |
097b73fc BB |
578 | if ($exact_duplicate{$orig}++) { |
579 | return &transmo; | |
49704364 | 580 | } else { |
097b73fc BB |
581 | return 0 unless &transmo; |
582 | } | |
49704364 | 583 | |
4633a7c4 LW |
584 | $orig = shorten($orig); |
585 | if ($old_diag{$_}) { | |
586 | autodescribe(); | |
587 | print THITHER "$orig (#$old_diag{$_})\n"; | |
588 | $wantspace = 1; | |
589 | } else { | |
590 | autodescribe(); | |
591 | $old_diag{$_} = ++$count; | |
592 | print THITHER "\n" if $wantspace; | |
593 | $wantspace = 0; | |
594 | print THITHER "$orig (#$old_diag{$_})\n"; | |
595 | if ($msg{$_}) { | |
596 | print THITHER $msg{$_}; | |
597 | } else { | |
598 | if (0 and $standalone) { | |
599 | print THITHER " **** Error #$old_diag{$_} ", | |
600 | ($real ? "is" : "appears to be"), | |
601 | " an unknown diagnostic message.\n\n"; | |
602 | } | |
603 | return 0; | |
604 | } | |
605 | } | |
606 | return 1; | |
607 | } | |
608 | ||
609 | sub autodescribe { | |
610 | if ($VERBOSE and not $count) { | |
611 | print THITHER &{$PRETTY ? \&bold : \&noop}("DESCRIPTION OF DIAGNOSTICS"), | |
612 | "\n$msg{DESCRIPTION}\n"; | |
613 | } | |
614 | } | |
615 | ||
616 | sub unescape { | |
617 | s { | |
618 | E< | |
619 | ( [A-Za-z]+ ) | |
620 | > | |
621 | } { | |
622 | do { | |
623 | exists $HTML_Escapes{$1} | |
624 | ? do { $HTML_Escapes{$1} } | |
625 | : do { | |
f02a87df | 626 | warn "Unknown escape: E<$1> in $_"; |
4633a7c4 LW |
627 | "E<$1>"; |
628 | } | |
629 | } | |
630 | }egx; | |
631 | } | |
632 | ||
633 | sub shorten { | |
634 | my $line = $_[0]; | |
774d564b | 635 | if (length($line) > 79 and index($line, "\n") == -1) { |
4633a7c4 LW |
636 | my $space_place = rindex($line, ' ', 79); |
637 | if ($space_place != -1) { | |
638 | substr($line, $space_place, 1) = "\n\t"; | |
639 | } | |
640 | } | |
641 | return $line; | |
642 | } | |
643 | ||
644 | ||
4633a7c4 LW |
645 | 1 unless $standalone; # or it'll complain about itself |
646 | __END__ # wish diag dbase were more accessible |