1 | NAME |
1 | NAME |
2 | Devel::FindRef - where is that reference to my scalar hiding? |
2 | Devel::FindRef - where is that reference to my variable hiding? |
3 | |
3 | |
4 | SYNOPSIS |
4 | SYNOPSIS |
5 | use Devel::FindRef; |
5 | use Devel::FindRef; |
6 | |
6 | |
7 | DESCRIPTION |
7 | DESCRIPTION |
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14 | to the variables containing them. |
14 | to the variables containing them. |
15 | |
15 | |
16 | For example, for this fragment: |
16 | For example, for this fragment: |
17 | |
17 | |
18 | package Test; |
18 | package Test; |
19 | |
19 | |
20 | our $var = "hi\n"; |
20 | our $var = "hi\n"; |
21 | my $x = \$var; |
21 | my $x = \$var; |
22 | our %hash = (ukukey => \$var); |
22 | our %hash = (ukukey => \$var); |
23 | our $hash2 = {ukukey2 => \$var}; |
23 | our $hash2 = {ukukey2 => \$var}; |
24 | |
24 | |
25 | sub testsub { |
25 | sub testsub { |
26 | my $local = $hash2; |
26 | my $local = $hash2; |
27 | print Devel::FindRef::track \$var; |
27 | print Devel::FindRef::track \$var; |
28 | } |
28 | } |
29 | |
29 | |
30 | testsub; |
30 | testsub; |
31 | |
31 | |
32 | The output is as follows (or similar to this, in case I forget to update |
32 | The output is as follows (or similar to this, in case I forget to update |
33 | the manpage after some changes): |
33 | the manpage after some changes): |
34 | |
34 | |
35 | SCALAR(0x676fa0) is |
35 | SCALAR(0x814ece8) is |
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36 | +- in the global $Test::var. |
36 | referenced by REF(0x676fb0), which is |
37 | +- referenced by REF(0x814f9e4), which is |
37 | in the lexical '$x' in CODE(0x676370), which is |
38 | | in the lexical '$x' in CODE(0x814ed78), which is |
38 | not found anywhere I looked :( |
39 | | the containing scope for CODE(0x820c4b0), which is |
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40 | | in the global &Test::testsub. |
39 | referenced by REF(0x676360), which is |
41 | +- referenced by REF(0x814ed6c), which is |
40 | in the member 'ukukey' of HASH(0x756660), which is |
42 | | in the member 'ukukey' of HASH(0x81da20c), which is |
41 | in the global %Test::hash. |
43 | | in the global %Test::hash. |
42 | in the global $Test::var. |
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43 | referenced by REF(0x6760e0), which is |
44 | +- referenced by REF(0x814ec28), which is |
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45 | | not found anywhere I looked :( |
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46 | +- referenced by REF(0x814eb44), which is |
44 | in the member 'ukukey2' of HASH(0x676f30), which is |
47 | in the member 'ukukey2' of HASH(0x814f99c), which is |
45 | referenced by REF(0x77bcf0), which is |
48 | +- referenced by REF(0x820c450), which is |
46 | in the lexical '$local' in CODE(0x77bcb0), which is |
49 | | in the lexical '$local' in CODE(0x820c4b0), which was seen before. |
47 | in the global &Test::testsub. |
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48 | referenced by REF(0x77bc80), which is |
50 | +- referenced by REF(0x820c204), which is |
49 | in the global $Test::hash2. |
51 | in the global $Test::hash2. |
50 | |
52 | |
51 | It is a bit convoluted to read, but basically it says that the value |
53 | It is a bit convoluted to read, but basically it says that the value |
52 | stored in $var can be found: |
54 | stored in $var can be found: |
53 | |
55 | |
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88 | call on invalid ones. |
90 | call on invalid ones. |
89 | |
91 | |
90 | # we know that HASH(0x176ff70) exists, so turn it into a hashref: |
92 | # we know that HASH(0x176ff70) exists, so turn it into a hashref: |
91 | my $ref_to_hash = Devel::FindRef::ptr2ref 0x176ff70; |
93 | my $ref_to_hash = Devel::FindRef::ptr2ref 0x176ff70; |
92 | |
94 | |
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95 | $ref = Devel::FindRef::ref2ptr $reference |
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96 | The opposite of "ptr2ref", above: returns the internal address of |
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97 | the value pointed to by the passed reference. *No checks whatsoever |
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98 | will be done*, so don't use this. |
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99 | |
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100 | ENVIRONMENT VARIABLES |
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101 | You can set the environment variable "PERL_DEVEL_FINDREF_DEPTH" to an |
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102 | integer to override the default depth in "track". If a call explicitly |
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103 | specified a depth it is not overridden. |
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104 | |
93 | AUTHOR |
105 | AUTHOR |
94 | Marc Lehmann <pcg@goof.com>. |
106 | Marc Lehmann <pcg@goof.com>. |
95 | |
107 | |
96 | BUGS |
108 | BUGS |
97 | Only code values, arrays, hashes, scalars and magic are being looked at. |
109 | Only code values, arrays, hashes, scalars and magic are being looked at. |