| 1 | package Devel::FindRef; |
1 | package Devel::FindRef; |
| 2 | |
2 | |
| 3 | use strict; |
3 | use strict; |
| 4 | |
4 | |
| 5 | use XSLoader; |
5 | use XSLoader; |
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|
6 | use Scalar::Util; |
| 6 | |
7 | |
| 7 | BEGIN { |
8 | BEGIN { |
| 8 | our $VERSION = '1.0'; |
9 | our $VERSION = '1.2'; |
| 9 | XSLoader::load __PACKAGE__, $VERSION; |
10 | XSLoader::load __PACKAGE__, $VERSION; |
| 10 | } |
11 | } |
| 11 | |
12 | |
| 12 | =head1 NAME |
13 | =head1 NAME |
| 13 | |
14 | |
| … | |
… | |
| 44 | testsub; |
45 | testsub; |
| 45 | |
46 | |
| 46 | The output is as follows (or similar to this, in case I forget to update |
47 | The output is as follows (or similar to this, in case I forget to update |
| 47 | the manpage after some changes): |
48 | the manpage after some changes): |
| 48 | |
49 | |
| 49 | SCALAR(0x676fa0) is |
50 | SCALAR(0x7bd2d0) is |
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51 | in the global $Test::var. |
| 50 | referenced by REF(0x676fb0), which is |
52 | referenced by REF(0x7bd240), which is |
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53 | in the member 'ukukey2' of HASH(0x7bd228), which is |
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54 | referenced by REF(0x81dae8), which is |
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55 | in the lexical '$local' in CODE(0x81da88), which is |
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56 | in the global &Test::testsub. |
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57 | referenced by REF(0x81da40), which is |
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58 | in the global $Test::hash2. |
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59 | referenced by REF(0x79f3f8), which is |
| 51 | in the lexical '$x' in CODE(0x676370), which is |
60 | in the lexical '$x' in CODE(0x79f518), which is |
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61 | the containing scope for CODE(0x81da88), which is |
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62 | in the global &Test::testsub. |
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63 | referenced by REF(0x79f2f0), which is |
| 52 | not found anywhere I looked :( |
64 | not found anywhere I looked :( |
| 53 | referenced by REF(0x676360), which is |
65 | referenced by REF(0x79f140), which is |
| 54 | in the member 'ukukey' of HASH(0x756660), which is |
66 | in the member 'ukukey' of HASH(0x81d698), which is |
| 55 | in the global %Test::hash. |
67 | in the global %Test::hash. |
| 56 | in the global $Test::var. |
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| 57 | referenced by REF(0x6760e0), which is |
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| 58 | in the member 'ukukey2' of HASH(0x676f30), which is |
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| 59 | referenced by REF(0x77bcf0), which is |
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| 60 | in the lexical '$local' in CODE(0x77bcb0), which is |
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| 61 | in the global &Test::testsub. |
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| 62 | referenced by REF(0x77bc80), which is |
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| 63 | in the global $Test::hash2. |
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| 64 | |
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| 65 | |
68 | |
| 66 | It is a bit convoluted to read, but basically it says that the value |
69 | It is a bit convoluted to read, but basically it says that the value |
| 67 | stored in C<$var> can be found: |
70 | stored in C<$var> can be found: |
| 68 | |
71 | |
| 69 | =over 4 |
72 | =over 4 |
| … | |
… | |
| 100 | =cut |
103 | =cut |
| 101 | |
104 | |
| 102 | sub find($); |
105 | sub find($); |
| 103 | |
106 | |
| 104 | sub track { |
107 | sub track { |
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108 | my ($ref, $depth) = @_; |
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109 | @_ = (); |
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110 | |
| 105 | my $buf = ""; |
111 | my $buf = ""; |
| 106 | my %ignore; |
112 | |
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113 | Scalar::Util::weaken $ref; |
| 107 | |
114 | |
| 108 | my $track; $track = sub { |
115 | my $track; $track = sub { |
| 109 | my ($target, $depth, $indent) = @_; |
116 | my ($refref, $depth, $indent) = @_; |
| 110 | @_ = (); |
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| 111 | local $ignore{$target+0} = undef; |
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| 112 | |
117 | |
| 113 | if ($depth) { |
118 | if ($depth) { |
| 114 | my (@about) = grep !exists $ignore{$_->[1]}, find $target; |
119 | my (@about) = find $$refref; |
| 115 | if (@about) { |
120 | if (@about) { |
| 116 | local @ignore{map $_->[1]+0, @about} = (); |
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|
| 117 | for my $about (@about) { |
121 | for my $about (@about) { |
| 118 | local $ignore{$about+0} = undef; |
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| 119 | $buf .= (" ") x $indent; |
122 | $buf .= (" ") x $indent; |
| 120 | $buf .= $about->[0]; |
123 | $buf .= $about->[0]; |
| 121 | if (@$about > 1) { |
124 | if (@$about > 1) { |
| 122 | $buf .= " $about->[1], which is\n"; |
125 | $buf .= " $about->[1], which is\n"; |
| 123 | $track->($about->[1], $depth - 1, $indent + 1); |
126 | $track->(\$about->[1], $depth - 1, $indent + 1); |
| 124 | } else { |
127 | } else { |
| 125 | $buf .= ".\n"; |
128 | $buf .= ".\n"; |
| 126 | } |
129 | } |
| 127 | } |
130 | } |
| 128 | } else { |
131 | } else { |
| … | |
… | |
| 133 | $buf .= (" ") x $indent; |
136 | $buf .= (" ") x $indent; |
| 134 | $buf .= "not referenced within the search depth.\n"; |
137 | $buf .= "not referenced within the search depth.\n"; |
| 135 | } |
138 | } |
| 136 | }; |
139 | }; |
| 137 | |
140 | |
| 138 | $buf .= "$_[0] is\n"; |
141 | $buf .= "$ref is\n"; |
| 139 | $track->($_[0], $_[1] || 10, 1); |
142 | $track->(\$ref, $depth || 10, 1); |
| 140 | $buf |
143 | $buf |
| 141 | } |
144 | } |
| 142 | |
145 | |
| 143 | =item @references = Devel::FindRef::find $ref |
146 | =item @references = Devel::FindRef::find $ref |
| 144 | |
147 | |
| 145 | Return arrayrefs that contain [$message, $ref] pairs. The message |
148 | Return arrayrefs that contain [$message, $ref] pairs. The message |
| 146 | describes what kind of reference was found and the C<$ref> is the |
149 | describes what kind of reference was found and the C<$ref> is the |
| 147 | reference itself, which cna be omitted if C<find> decided to end the |
150 | reference itself, which can be omitted if C<find> decided to end the |
| 148 | search. |
151 | search. The returned references are all weak references. |
| 149 | |
152 | |
| 150 | The C<track> function uses this to find references to the value you are |
153 | The C<track> function uses this to find references to the value you are |
| 151 | interested in and recurses on the returned references. |
154 | interested in and recurses on the returned references. |
| 152 | |
155 | |
| 153 | =cut |
156 | =cut |
