| … | |
… | |
| 4 | SYNOPSIS |
4 | SYNOPSIS |
| 5 | use Devel::FindRef; |
5 | use Devel::FindRef; |
| 6 | |
6 | |
| 7 | DESCRIPTION |
7 | DESCRIPTION |
| 8 | Tracking down reference problems (e.g. you expect some object to be |
8 | Tracking down reference problems (e.g. you expect some object to be |
| 9 | destroyed, but there are still references to it that keep it alive). can |
9 | destroyed, but there are still references to it that keep it alive) can |
| 10 | be very hard, although perl keeps track of all values. |
10 | be very hard. Fortunately, perl keeps track of all its values, so |
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11 | tracking references "backwards" is usually possible. |
| 11 | |
12 | |
| 12 | The "track" function can hlep track down some of those refernces back to |
13 | The "track" function can help track down some of those references back |
| 13 | the variables containing them. |
14 | to the variables containing them. |
| 14 | |
15 | |
| 15 | For example, for this fragment: |
16 | For example, for this fragment: |
| 16 | |
17 | |
| 17 | package Test; |
18 | package Test; |
| 18 | |
19 | |
| … | |
… | |
| 26 | print Devel::FindRef::track \$var; |
27 | print Devel::FindRef::track \$var; |
| 27 | } |
28 | } |
| 28 | |
29 | |
| 29 | testsub; |
30 | testsub; |
| 30 | |
31 | |
| 31 | The output is as follows (or similar to htis, in case I forget to update |
32 | The output is as follows (or similar to this, in case I forget to update |
| 32 | the manpage afetr some changes): |
33 | the manpage after some changes): |
| 33 | |
34 | |
| 34 | SCALAR(0x676fa0) is |
35 | SCALAR(0x676fa0) is |
| 35 | referenced by REF(0x676fb0), which is |
36 | referenced by REF(0x676fb0), which is |
| 36 | in the lexical '$x' in CODE(0x676370), which is |
37 | in the lexical '$x' in CODE(0x676370), which is |
| 37 | not found anywhere I looked :( |
38 | not found anywhere I looked :( |
| … | |
… | |
| 91 | |
92 | |
| 92 | BUGS |
93 | BUGS |
| 93 | Only code values, arrays, hashes, scalars and magic are being looked |
94 | Only code values, arrays, hashes, scalars and magic are being looked |
| 94 | at. |
95 | at. |
| 95 | |
96 | |
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97 | This is a quick hack only. |
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98 | |
| 96 | COPYRIGHT AND LICENSE |
99 | COPYRIGHT AND LICENSE |
| 97 | Copyright (C) 2007 by Marc Lehmann. |
100 | Copyright (C) 2007 by Marc Lehmann. |
| 98 | |
101 | |
| 99 | This library is free software; you can redistribute it and/or modify |
102 | This library is free software; you can redistribute it and/or modify |
| 100 | it under the same terms as Perl itself, either Perl version 5.8.8 |
103 | it under the same terms as Perl itself, either Perl version 5.8.8 |
