Commit | Line | Data |
218b7c12 |
1 | package DBICTest::Util::LeakTracer; |
2 | |
3 | use warnings; |
4 | use strict; |
5 | |
c0329273 |
6 | use ANFANG; |
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7 | use Carp; |
96577657 |
8 | use Scalar::Util qw(isweak weaken blessed reftype); |
8433421f |
9 | use DBIx::Class::_Util qw(refcount hrefaddr refdesc); |
556c4fe6 |
10 | use DBIx::Class::Optional::Dependencies; |
c0329273 |
11 | use DBICTest::RunMode; |
96577657 |
12 | use Data::Dumper::Concise; |
c9abd679 |
13 | use DBICTest::Util qw( stacktrace visit_namespaces ); |
556c4fe6 |
14 | use constant { |
30b4a316 |
15 | CV_TRACING => !DBICTest::RunMode->is_plain && DBIx::Class::Optional::Dependencies->req_ok_for ('test_leaks_heavy'), |
556c4fe6 |
16 | }; |
218b7c12 |
17 | |
18 | use base 'Exporter'; |
bf302897 |
19 | our @EXPORT_OK = qw(populate_weakregistry assert_empty_weakregistry visit_refs); |
218b7c12 |
20 | |
21 | my $refs_traced = 0; |
96577657 |
22 | my $leaks_found = 0; |
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23 | my %reg_of_regs; |
24 | |
25 | sub populate_weakregistry { |
96577657 |
26 | my ($weak_registry, $target, $note) = @_; |
218b7c12 |
27 | |
28 | croak 'Expecting a registry hashref' unless ref $weak_registry eq 'HASH'; |
29 | croak 'Target is not a reference' unless length ref $target; |
30 | |
96577657 |
31 | my $refaddr = hrefaddr $target; |
8fa57d17 |
32 | |
96577657 |
33 | # a registry could be fed to itself or another registry via recursive sweeps |
34 | return $target if $reg_of_regs{$refaddr}; |
218b7c12 |
35 | |
85ad63df |
36 | weaken( $reg_of_regs{ hrefaddr($weak_registry) } = $weak_registry ) |
37 | unless( $reg_of_regs{ hrefaddr($weak_registry) } ); |
38 | |
39 | # an explicit "garbage collection" pass every time we store a ref |
40 | # if we do not do this the registry will keep growing appearing |
41 | # as if the traced program is continuously slowly leaking memory |
42 | for my $reg (values %reg_of_regs) { |
43 | (defined $reg->{$_}{weakref}) or delete $reg->{$_} |
44 | for keys %$reg; |
45 | } |
46 | |
96577657 |
47 | if (! defined $weak_registry->{$refaddr}{weakref}) { |
48 | $weak_registry->{$refaddr} = { |
8fa57d17 |
49 | stacktrace => stacktrace(1), |
96577657 |
50 | weakref => $target, |
8fa57d17 |
51 | }; |
4841171c |
52 | |
53 | # on perl < 5.8.3 sometimes a weaken can throw (can't find RT) |
54 | # so guard against that unlikely event |
55 | local $@; |
56 | eval { weaken( $weak_registry->{$refaddr}{weakref} ); $refs_traced++ } |
57 | or delete $weak_registry->{$refaddr}; |
218b7c12 |
58 | } |
59 | |
8433421f |
60 | my $desc = refdesc $target; |
96577657 |
61 | $weak_registry->{$refaddr}{slot_names}{$desc} = 1; |
62 | if ($note) { |
63 | $note =~ s/\s*\Q$desc\E\s*//g; |
64 | $weak_registry->{$refaddr}{slot_names}{$note} = 1; |
65 | } |
66 | |
218b7c12 |
67 | $target; |
68 | } |
69 | |
96577657 |
70 | # Regenerate the slots names on a thread spawn |
218b7c12 |
71 | sub CLONE { |
72 | my @individual_regs = grep { scalar keys %{$_||{}} } values %reg_of_regs; |
73 | %reg_of_regs = (); |
74 | |
75 | for my $reg (@individual_regs) { |
96577657 |
76 | my @live_slots = grep { defined $_->{weakref} } values %$reg |
218b7c12 |
77 | or next; |
cf8fa286 |
78 | |
cf8fa286 |
79 | $reg = {}; # get a fresh hashref in the new thread ctx |
96577657 |
80 | weaken( $reg_of_regs{hrefaddr($reg)} = $reg ); |
218b7c12 |
81 | |
96577657 |
82 | for my $slot_info (@live_slots) { |
83 | my $new_addr = hrefaddr $slot_info->{weakref}; |
8fa57d17 |
84 | |
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85 | # replace all slot names |
86 | $slot_info->{slot_names} = { map { |
87 | my $name = $_; |
88 | $name =~ s/\(0x[0-9A-F]+\)/sprintf ('(%s)', $new_addr)/ieg; |
89 | ($name => 1); |
90 | } keys %{$slot_info->{slot_names}} }; |
218b7c12 |
91 | |
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92 | $reg->{$new_addr} = $slot_info; |
218b7c12 |
93 | } |
94 | } |
d52fc26d |
95 | |
96 | # Dummy NEXTSTATE ensuring the all temporaries on the stack are garbage |
97 | # collected before leaving this scope. Depending on the code above, this |
98 | # may very well be just a preventive measure guarding future modifications |
99 | undef; |
218b7c12 |
100 | } |
101 | |
556c4fe6 |
102 | sub visit_refs { |
103 | my $args = { (ref $_[0]) ? %{$_[0]} : @_ }; |
104 | |
105 | $args->{seen_refs} ||= {}; |
106 | |
107 | my $visited_cnt = '0E0'; |
108 | for my $i (0 .. $#{$args->{refs}} ) { |
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109 | |
a42634cd |
110 | next unless length ref $args->{refs}[$i]; # not-a-ref |
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111 | |
a42634cd |
112 | my $addr = hrefaddr $args->{refs}[$i]; |
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113 | |
6ae62c5c |
114 | # no diving into weakregistries |
a42634cd |
115 | next if $reg_of_regs{$addr}; |
556c4fe6 |
116 | |
a42634cd |
117 | next if $args->{seen_refs}{$addr}++; |
556c4fe6 |
118 | $visited_cnt++; |
a42634cd |
119 | |
120 | my $r = $args->{refs}[$i]; |
121 | |
556c4fe6 |
122 | $args->{action}->($r) or next; |
123 | |
6ae62c5c |
124 | # This may end up being necessarry some day, but do not slow things |
125 | # down for now |
126 | #if ( defined( my $t = tied($r) ) ) { |
127 | # $visited_cnt += visit_refs({ %$args, refs => [ $t ] }); |
128 | #} |
129 | |
a42634cd |
130 | my $type = reftype $r; |
131 | |
7664b1a0 |
132 | local $@; |
133 | eval { |
7664b1a0 |
134 | if ($type eq 'HASH') { |
135 | $visited_cnt += visit_refs({ %$args, refs => [ map { |
136 | ( !isweak($r->{$_}) ) ? $r->{$_} : () |
137 | } keys %$r ] }); |
138 | } |
139 | elsif ($type eq 'ARRAY') { |
140 | $visited_cnt += visit_refs({ %$args, refs => [ map { |
141 | ( !isweak($r->[$_]) ) ? $r->[$_] : () |
142 | } 0..$#$r ] }); |
143 | } |
144 | elsif ($type eq 'REF' and !isweak($$r)) { |
145 | $visited_cnt += visit_refs({ %$args, refs => [ $$r ] }); |
146 | } |
147 | elsif (CV_TRACING and $type eq 'CODE') { |
148 | $visited_cnt += visit_refs({ %$args, refs => [ map { |
149 | ( !isweak($_) ) ? $_ : () |
1a77219a |
150 | } values %{ scalar PadWalker::closed_over($r) } ] }); # scalar due to RT#92269 |
7664b1a0 |
151 | } |
152 | 1; |
8433421f |
153 | } or warn "Could not descend into @{[ refdesc $r ]}: $@\n"; |
556c4fe6 |
154 | } |
155 | $visited_cnt; |
156 | } |
157 | |
a42634cd |
158 | # compiles a list of addresses stored as globals (possibly even catching |
159 | # class data in the form of method closures), so we can skip them further on |
160 | sub symtable_referenced_addresses { |
161 | |
162 | my $refs_per_pkg; |
163 | |
a42634cd |
164 | my $seen_refs = {}; |
165 | visit_namespaces( |
166 | action => sub { |
556c4fe6 |
167 | |
556c4fe6 |
168 | no strict 'refs'; |
556c4fe6 |
169 | |
a42634cd |
170 | my $pkg = shift; |
a42634cd |
171 | |
556c4fe6 |
172 | # the unless regex at the end skips some dangerous namespaces outright |
173 | # (but does not prevent descent) |
a42634cd |
174 | $refs_per_pkg->{$pkg} += visit_refs ( |
556c4fe6 |
175 | seen_refs => $seen_refs, |
a42634cd |
176 | |
1a77219a |
177 | action => sub { 1 }, |
a42634cd |
178 | |
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179 | refs => [ map { my $sym = $_; |
c9abd679 |
180 | # *{"${pkg}::$sym"}{CODE} won't simply work - MRO-cached CVs are invisible there |
181 | ( CV_TRACING ? Class::MethodCache::get_cv("${pkg}::$sym") : () ), |
556c4fe6 |
182 | |
c9abd679 |
183 | ( defined *{"${pkg}::$sym"}{SCALAR} and length ref ${"${pkg}::$sym"} and ! isweak( ${"${pkg}::$sym"} ) ) |
184 | ? ${"${pkg}::$sym"} : () |
556c4fe6 |
185 | , |
a42634cd |
186 | |
556c4fe6 |
187 | ( map { |
c9abd679 |
188 | ( defined *{"${pkg}::$sym"}{$_} and ! isweak(defined *{"${pkg}::$sym"}{$_}) ) |
189 | ? *{"${pkg}::$sym"}{$_} |
556c4fe6 |
190 | : () |
191 | } qw(HASH ARRAY IO GLOB) ), |
a42634cd |
192 | |
c9abd679 |
193 | } keys %{"${pkg}::"} ], |
194 | ) unless $pkg =~ /^ (?: |
556c4fe6 |
195 | DB | next | B | .+? ::::ISA (?: ::CACHE ) | Class::C3 |
c9abd679 |
196 | ) $/x; |
a42634cd |
197 | } |
198 | ); |
556c4fe6 |
199 | |
a42634cd |
200 | # use Devel::Dwarn; |
201 | # Ddie [ map |
202 | # { { $_ => $refs_per_pkg->{$_} } } |
203 | # sort |
204 | # {$refs_per_pkg->{$a} <=> $refs_per_pkg->{$b} } |
205 | # keys %$refs_per_pkg |
206 | # ]; |
207 | |
208 | $seen_refs; |
209 | } |
210 | |
211 | sub assert_empty_weakregistry { |
212 | my ($weak_registry, $quiet) = @_; |
213 | |
214 | # in case we hooked bless any extra object creation will wreak |
215 | # havoc during the assert phase |
216 | local *CORE::GLOBAL::bless; |
821edc09 |
217 | *CORE::GLOBAL::bless = sub { CORE::bless( $_[0], (@_ > 1) ? $_[1] : CORE::caller() ) }; |
a42634cd |
218 | |
219 | croak 'Expecting a registry hashref' unless ref $weak_registry eq 'HASH'; |
220 | |
221 | defined $weak_registry->{$_}{weakref} or delete $weak_registry->{$_} |
222 | for keys %$weak_registry; |
223 | |
224 | return unless keys %$weak_registry; |
8fa57d17 |
225 | |
a42634cd |
226 | my $tb = eval { Test::Builder->new } |
227 | or croak "Calling assert_empty_weakregistry in $0 without a loaded Test::Builder makes no sense"; |
8fa57d17 |
228 | |
a42634cd |
229 | for my $addr (keys %$weak_registry) { |
230 | $weak_registry->{$addr}{display_name} = join ' | ', ( |
231 | sort |
232 | { length $a <=> length $b or $a cmp $b } |
233 | keys %{$weak_registry->{$addr}{slot_names}} |
234 | ); |
235 | |
236 | $tb->BAILOUT("!!!! WEAK REGISTRY SLOT $weak_registry->{$addr}{display_name} IS NOT A WEAKREF !!!!") |
237 | if defined $weak_registry->{$addr}{weakref} and ! isweak( $weak_registry->{$addr}{weakref} ); |
238 | } |
239 | |
8d73fcd4 |
240 | # the symtable walk is very expensive |
241 | # if we are $quiet (running in an END block) we do not really need to be |
242 | # that thorough - can get by with only %Sub::Quote::QUOTED |
243 | delete $weak_registry->{$_} for $quiet |
244 | ? do { |
245 | my $refs = {}; |
246 | visit_refs ( |
247 | # only look at the closed over stuffs |
248 | refs => [ grep { length ref $_ } map { values %{$_->[2]} } grep { ref $_ eq 'ARRAY' } values %Sub::Quote::QUOTED ], |
249 | seen_refs => $refs, |
250 | action => sub { 1 }, |
251 | ); |
252 | keys %$refs; |
253 | } |
254 | : ( |
255 | # full sumtable walk, starting from :: |
256 | keys %{ symtable_referenced_addresses() } |
257 | ) |
258 | ; |
556c4fe6 |
259 | |
96577657 |
260 | for my $addr (sort { $weak_registry->{$a}{display_name} cmp $weak_registry->{$b}{display_name} } keys %$weak_registry) { |
261 | |
1a44a267 |
262 | next if ! defined $weak_registry->{$addr}{weakref}; |
263 | |
5dc4301c |
264 | $leaks_found++ unless $tb->in_todo; |
ee20ecfc |
265 | $tb->ok (0, "Expected garbage collection of $weak_registry->{$addr}{display_name}"); |
1a44a267 |
266 | |
267 | my $diag = do { |
268 | local $Data::Dumper::Maxdepth = 1; |
269 | sprintf "\n%s (refcnt %d) => %s\n", |
270 | $weak_registry->{$addr}{display_name}, |
271 | refcount($weak_registry->{$addr}{weakref}), |
272 | ( |
273 | ref($weak_registry->{$addr}{weakref}) eq 'CODE' |
274 | and |
275 | B::svref_2object($weak_registry->{$addr}{weakref})->XSUB |
276 | ) ? '__XSUB__' : Dumper( $weak_registry->{$addr}{weakref} ) |
277 | ; |
218b7c12 |
278 | }; |
1a44a267 |
279 | |
5dc4301c |
280 | # FIXME - need to add a circular reference seeker based on the visitor |
281 | # (will need a bunch of modifications, punting with just a stub for now) |
282 | |
556c4fe6 |
283 | $diag .= Devel::FindRef::track ($weak_registry->{$addr}{weakref}, 50) . "\n" |
1a44a267 |
284 | if ( $ENV{TEST_VERBOSE} && eval { require Devel::FindRef }); |
285 | |
286 | $diag =~ s/^/ /mg; |
287 | |
288 | if (my $stack = $weak_registry->{$addr}{stacktrace}) { |
289 | $diag .= " Reference first seen$stack"; |
290 | } |
291 | |
292 | $tb->diag($diag); |
6ae62c5c |
293 | |
294 | # if ($leaks_found == 1) { |
295 | # # using the fh dumper due to intermittent buffering issues |
296 | # # in case we decide to exit soon after (possibly via _exit) |
297 | # require Devel::MAT::Dumper; |
298 | # local $Devel::MAT::Dumper::MAX_STRING = -1; |
299 | # open( my $fh, '>:raw', "leaked_${addr}_pid$$.pmat" ) or die $!; |
300 | # Devel::MAT::Dumper::dumpfh( $fh ); |
301 | # close ($fh) or die $!; |
302 | # |
47603d6c |
303 | # require POSIX; |
6ae62c5c |
304 | # POSIX::_exit(1); |
305 | # } |
1a44a267 |
306 | } |
307 | |
5dc4301c |
308 | if (! $quiet and !$leaks_found and ! $tb->in_todo) { |
821edc09 |
309 | $tb->ok(1, sprintf "No leaks found at %s line %d", (CORE::caller())[1,2] ); |
218b7c12 |
310 | } |
311 | } |
312 | |
313 | END { |
b77a61d8 |
314 | if ( |
315 | $INC{'Test/Builder.pm'} |
316 | and |
317 | my $tb = do { |
318 | local $@; |
319 | my $t = eval { Test::Builder->new } |
320 | or warn "Test::Builder->new failed:\n$@\n"; |
321 | $t; |
322 | } |
323 | ) { |
218b7c12 |
324 | # we check for test passage - a leak may be a part of a TODO |
325 | if ($leaks_found and !$tb->is_passing) { |
326 | |
327 | $tb->diag(sprintf |
328 | "\n\n%s\n%s\n\nInstall Devel::FindRef and re-run the test with set " |
329 | . '$ENV{TEST_VERBOSE} (prove -v) to see a more detailed leak-report' |
330 | . "\n\n%s\n%s\n\n", ('#' x 16) x 4 |
331 | ) if ( !$ENV{TEST_VERBOSE} or !$INC{'Devel/FindRef.pm'} ); |
332 | |
333 | } |
334 | else { |
335 | $tb->note("Auto checked $refs_traced references for leaks - none detected"); |
336 | } |
cbd7f87a |
337 | |
cbd7f87a |
338 | # also while we are here and not in plain runmode: make sure we never |
339 | # loaded any of the strictures XS bullshit (it's a leak in a sense) |
0020e364 |
340 | unless ( |
341 | $ENV{MOO_FATAL_WARNINGS} |
342 | or |
343 | # FIXME - SQLT loads strictures explicitly, /facedesk |
344 | # remove this INC check when 0fb58589 and 45287c815 are rectified |
345 | $INC{'SQL/Translator.pm'} |
346 | or |
347 | DBICTest::RunMode->is_plain |
348 | ) { |
cbd7f87a |
349 | for (qw(indirect multidimensional bareword::filehandles)) { |
350 | exists $INC{ Module::Runtime::module_notional_filename($_) } |
351 | and |
ee20ecfc |
352 | $tb->ok(0, "$_ load should not have been attempted!!!" ) |
cbd7f87a |
353 | } |
354 | } |
218b7c12 |
355 | } |
356 | } |
357 | |
358 | 1; |