Commit | Line | Data |
---|---|---|
b75c8c73 | 1 | # Carp::Heavy uses some variables in common with Carp. |
3b5ca523 | 2 | package Carp; |
ca24dfc6 | 3 | |
ab648d5e JH |
4 | =head1 NAME |
5 | ||
4952958f | 6 | Carp::Heavy - heavy machinery, no user serviceable parts inside |
ab648d5e JH |
7 | |
8 | =cut | |
9 | ||
b75c8c73 MS |
10 | # On one line so MakeMaker will see it. |
11 | use Carp; our $VERSION = $Carp::VERSION; | |
29ddba3b DM |
12 | # use strict; # not yet |
13 | ||
14 | # 'use Carp' just installs some very lightweight stubs; the first time | |
15 | # these are called, they require Carp::Heavy which installs the real | |
16 | # routines. | |
17 | ||
18 | # Comments added by Andy Wardley <abw@kfs.org> 09-Apr-98, based on an | |
19 | # _almost_ complete understanding of the package. Corrections and | |
20 | # comments are welcome. | |
21 | ||
22 | # The members of %Internal are packages that are internal to perl. | |
23 | # Carp will not report errors from within these packages if it | |
24 | # can. The members of %CarpInternal are internal to Perl's warning | |
25 | # system. Carp will not report errors from within these packages | |
26 | # either, and will not report calls *to* these packages for carp and | |
27 | # croak. They replace $CarpLevel, which is deprecated. The | |
28 | # $Max(EvalLen|(Arg(Len|Nums)) variables are used to specify how the eval | |
29 | # text and function arguments should be formatted when printed. | |
30 | ||
31 | # Comments added by Jos I. Boumans <kane@dwim.org> 11-Aug-2004 | |
32 | # I can not get %CarpInternal or %Internal to work as advertised, | |
33 | # therefore leaving it out of the below documentation. | |
34 | # $CarpLevel may be decprecated according to the last comment, but | |
35 | # after 6 years, it's still around and in heavy use ;) | |
36 | ||
37 | # disable these by default, so they can live w/o require Carp | |
38 | $CarpInternal{Carp}++; | |
39 | $CarpInternal{warnings}++; | |
40 | $Internal{Exporter}++; | |
41 | $Internal{'Exporter::Heavy'}++; | |
42 | ||
b75c8c73 | 43 | |
eb2aae6f | 44 | our ($CarpLevel, $MaxArgNums, $MaxEvalLen, $MaxArgLen, $Verbose); |
ca24dfc6 | 45 | |
29ddba3b DM |
46 | # XXX longmess_real and shortmess_real should really be merged into |
47 | # XXX {long|sort}mess_heavy at some point | |
48 | ||
49 | sub longmess_real { | |
50 | # Icky backwards compatibility wrapper. :-( | |
51 | my $call_pack = caller(); | |
52 | if ($Internal{$call_pack} or $CarpInternal{$call_pack}) { | |
53 | return longmess_heavy(@_); | |
54 | } | |
55 | else { | |
56 | local $CarpLevel = $CarpLevel + 1; | |
57 | return longmess_heavy(@_); | |
58 | } | |
59 | }; | |
60 | ||
61 | sub shortmess_real { | |
62 | # Icky backwards compatibility wrapper. :-( | |
63 | my $call_pack = caller(); | |
64 | local @CARP_NOT = caller(); | |
65 | shortmess_heavy(@_); | |
66 | }; | |
67 | ||
68 | # replace the two hooks added by Carp | |
69 | ||
70 | # aliasing the whole glob rather than just the CV slot avoids 'redefined' | |
71 | # warnings, even in the presence of perl -W (as used by lib/warnings.t !) | |
72 | ||
73 | *longmess_jmp = *longmess_real; | |
74 | *shortmess_jmp = *shortmess_real; | |
75 | ||
76 | ||
66a4a569 BT |
77 | sub caller_info { |
78 | my $i = shift(@_) + 1; | |
79 | package DB; | |
80 | my %call_info; | |
81 | @call_info{ | |
82 | qw(pack file line sub has_args wantarray evaltext is_require) | |
83 | } = caller($i); | |
84 | ||
85 | unless (defined $call_info{pack}) { | |
86 | return (); | |
87 | } | |
88 | ||
89 | my $sub_name = Carp::get_subname(\%call_info); | |
90 | if ($call_info{has_args}) { | |
a3775ca3 | 91 | my @args = map {Carp::format_arg($_)} @DB::args; |
66a4a569 BT |
92 | if ($MaxArgNums and @args > $MaxArgNums) { # More than we want to show? |
93 | $#args = $MaxArgNums; | |
94 | push @args, '...'; | |
95 | } | |
96 | # Push the args onto the subroutine | |
1798c67d | 97 | $sub_name .= '(' . join (', ', @args) . ')'; |
66a4a569 BT |
98 | } |
99 | $call_info{sub_name} = $sub_name; | |
100 | return wantarray() ? %call_info : \%call_info; | |
101 | } | |
ca24dfc6 | 102 | |
66a4a569 BT |
103 | # Transform an argument to a function into a string. |
104 | sub format_arg { | |
105 | my $arg = shift; | |
8a7acfb9 | 106 | if (ref($arg)) { |
3a57e0bb | 107 | $arg = defined($overload::VERSION) ? overload::StrVal($arg) : "$arg"; |
8a7acfb9 YO |
108 | }elsif (not defined($arg)) { |
109 | $arg = 'undef'; | |
66a4a569 BT |
110 | } |
111 | $arg =~ s/'/\\'/g; | |
eb2aae6f | 112 | $arg = str_len_trim($arg, $MaxArgLen); |
66a4a569 BT |
113 | |
114 | # Quote it? | |
115 | $arg = "'$arg'" unless $arg =~ /^-?[\d.]+\z/; | |
116 | ||
117 | # The following handling of "control chars" is direct from | |
e6ddefa8 | 118 | # the original code - it is broken on Unicode though. |
66a4a569 | 119 | # Suggestions? |
e6ddefa8 RGS |
120 | utf8::is_utf8($arg) |
121 | or $arg =~ s/([[:cntrl:]]|[[:^ascii:]])/sprintf("\\x{%x}",ord($1))/eg; | |
66a4a569 BT |
122 | return $arg; |
123 | } | |
ca24dfc6 | 124 | |
66a4a569 BT |
125 | # Takes an inheritance cache and a package and returns |
126 | # an anon hash of known inheritances and anon array of | |
127 | # inheritances which consequences have not been figured | |
128 | # for. | |
129 | sub get_status { | |
130 | my $cache = shift; | |
131 | my $pkg = shift; | |
132 | $cache->{$pkg} ||= [{$pkg => $pkg}, [trusts_directly($pkg)]]; | |
133 | return @{$cache->{$pkg}}; | |
134 | } | |
ca24dfc6 | 135 | |
66a4a569 BT |
136 | # Takes the info from caller() and figures out the name of |
137 | # the sub/require/eval | |
138 | sub get_subname { | |
139 | my $info = shift; | |
976ea96e RS |
140 | if (defined($info->{evaltext})) { |
141 | my $eval = $info->{evaltext}; | |
66a4a569 BT |
142 | if ($info->{is_require}) { |
143 | return "require $eval"; | |
144 | } | |
145 | else { | |
146 | $eval =~ s/([\\\'])/\\$1/g; | |
976ea96e | 147 | return "eval '" . str_len_trim($eval, $MaxEvalLen) . "'"; |
66a4a569 BT |
148 | } |
149 | } | |
150 | ||
151 | return ($info->{sub} eq '(eval)') ? 'eval {...}' : $info->{sub}; | |
152 | } | |
153 | ||
154 | # Figures out what call (from the point of view of the caller) | |
155 | # the long error backtrace should start at. | |
156 | sub long_error_loc { | |
157 | my $i; | |
158 | my $lvl = $CarpLevel; | |
159 | { | |
160 | my $pkg = caller(++$i); | |
161 | unless(defined($pkg)) { | |
162 | # This *shouldn't* happen. | |
163 | if (%Internal) { | |
164 | local %Internal; | |
165 | $i = long_error_loc(); | |
166 | last; | |
167 | } | |
168 | else { | |
169 | # OK, now I am irritated. | |
170 | return 2; | |
171 | } | |
172 | } | |
173 | redo if $CarpInternal{$pkg}; | |
174 | redo unless 0 > --$lvl; | |
175 | redo if $Internal{$pkg}; | |
176 | } | |
177 | return $i - 1; | |
178 | } | |
ca24dfc6 | 179 | |
3cb6de81 | 180 | |
66a4a569 | 181 | sub longmess_heavy { |
25f5609c | 182 | return @_ if ref($_[0]); # don't break references as exceptions |
66a4a569 BT |
183 | my $i = long_error_loc(); |
184 | return ret_backtrace($i, @_); | |
185 | } | |
ca24dfc6 | 186 | |
66a4a569 BT |
187 | # Returns a full stack backtrace starting from where it is |
188 | # told. | |
189 | sub ret_backtrace { | |
190 | my ($i, @error) = @_; | |
191 | my $mess; | |
192 | my $err = join '', @error; | |
193 | $i++; | |
194 | ||
195 | my $tid_msg = ''; | |
196 | if (defined &Thread::tid) { | |
197 | my $tid = Thread->self->tid; | |
198 | $tid_msg = " thread $tid" if $tid; | |
199 | } | |
200 | ||
59b0a8b7 SH |
201 | my %i = caller_info($i); |
202 | $mess = "$err at $i{file} line $i{line}$tid_msg\n"; | |
66a4a569 BT |
203 | |
204 | while (my %i = caller_info(++$i)) { | |
205 | $mess .= "\t$i{sub_name} called at $i{file} line $i{line}$tid_msg\n"; | |
fbb63a9e | 206 | } |
66a4a569 | 207 | |
25f5609c | 208 | return $mess; |
66a4a569 | 209 | } |
3b5ca523 | 210 | |
66a4a569 BT |
211 | sub ret_summary { |
212 | my ($i, @error) = @_; | |
66a4a569 BT |
213 | my $err = join '', @error; |
214 | $i++; | |
3b5ca523 | 215 | |
66a4a569 BT |
216 | my $tid_msg = ''; |
217 | if (defined &Thread::tid) { | |
218 | my $tid = Thread->self->tid; | |
219 | $tid_msg = " thread $tid" if $tid; | |
220 | } | |
3b5ca523 | 221 | |
66a4a569 BT |
222 | my %i = caller_info($i); |
223 | return "$err at $i{file} line $i{line}$tid_msg\n"; | |
3b5ca523 GS |
224 | } |
225 | ||
226 | ||
66a4a569 BT |
227 | sub short_error_loc { |
228 | my $cache; | |
229 | my $i = 1; | |
230 | my $lvl = $CarpLevel; | |
231 | { | |
232 | my $called = caller($i++); | |
233 | my $caller = caller($i); | |
29ddba3b | 234 | |
66a4a569 BT |
235 | return 0 unless defined($caller); # What happened? |
236 | redo if $Internal{$caller}; | |
237 | redo if $CarpInternal{$called}; | |
238 | redo if trusts($called, $caller, $cache); | |
239 | redo if trusts($caller, $called, $cache); | |
240 | redo unless 0 > --$lvl; | |
241 | } | |
242 | return $i - 1; | |
191f2cf3 GS |
243 | } |
244 | ||
29ddba3b | 245 | |
66a4a569 BT |
246 | sub shortmess_heavy { |
247 | return longmess_heavy(@_) if $Verbose; | |
25f5609c | 248 | return @_ if ref($_[0]); # don't break references as exceptions |
66a4a569 BT |
249 | my $i = short_error_loc(); |
250 | if ($i) { | |
251 | ret_summary($i, @_); | |
252 | } | |
253 | else { | |
254 | longmess_heavy(@_); | |
255 | } | |
256 | } | |
257 | ||
258 | # If a string is too long, trims it with ... | |
259 | sub str_len_trim { | |
260 | my $str = shift; | |
261 | my $max = shift || 0; | |
262 | if (2 < $max and $max < length($str)) { | |
263 | substr($str, $max - 3) = '...'; | |
264 | } | |
265 | return $str; | |
266 | } | |
191f2cf3 | 267 | |
66a4a569 BT |
268 | # Takes two packages and an optional cache. Says whether the |
269 | # first inherits from the second. | |
270 | # | |
271 | # Recursive versions of this have to work to avoid certain | |
272 | # possible endless loops, and when following long chains of | |
273 | # inheritance are less efficient. | |
274 | sub trusts { | |
275 | my $child = shift; | |
276 | my $parent = shift; | |
277 | my $cache = shift || {}; | |
278 | my ($known, $partial) = get_status($cache, $child); | |
279 | # Figure out consequences until we have an answer | |
280 | while (@$partial and not exists $known->{$parent}) { | |
281 | my $anc = shift @$partial; | |
282 | next if exists $known->{$anc}; | |
283 | $known->{$anc}++; | |
284 | my ($anc_knows, $anc_partial) = get_status($cache, $anc); | |
285 | my @found = keys %$anc_knows; | |
286 | @$known{@found} = (); | |
287 | push @$partial, @$anc_partial; | |
3b5ca523 | 288 | } |
66a4a569 BT |
289 | return exists $known->{$parent}; |
290 | } | |
3b5ca523 | 291 | |
66a4a569 BT |
292 | # Takes a package and gives a list of those trusted directly |
293 | sub trusts_directly { | |
294 | my $class = shift; | |
a3775ca3 | 295 | no strict 'refs'; |
b5777b26 | 296 | no warnings 'once'; |
a3775ca3 BT |
297 | return @{"$class\::CARP_NOT"} |
298 | ? @{"$class\::CARP_NOT"} | |
299 | : @{"$class\::ISA"}; | |
3b5ca523 GS |
300 | } |
301 | ||
302 | 1; | |
66a4a569 | 303 |