1B::Hooks::OP::Check::StUassehrChCaonngter(i3b)uted PerlBD:o:cHuomoeknst:a:tOiPo:n:Check::StashChange(3)
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NAME

6       B::Hooks::OP::Check::StashChange - Invoke callbacks when the stash code
7       is being compiled in changes
8

SYNOPSIS

10   From Perl
11           package Foo;
12
13           use B::Hooks::OP::Check::StashChange;
14
15           our $id = B::Hooks::OP::Check::StashChange::register(sub {
16               my ($new, $old) = @_;
17               warn "${old} -> ${new}";
18           });
19
20           package Bar; # "Foo -> Bar"
21
22           B::Hooks::OP::Check::StashChange::unregister($Foo::id);
23
24           package Moo; # callback not invoked
25
26   From C/XS
27           #include "hooks_op_check_stashchange.h"
28
29           STATIC OP *
30           my_callback (pTHX_ OP *op, char *new_stash, char *old_stash, void *user_data) {
31               /* ... */
32               return op;
33           }
34
35           UV id;
36
37           /* register callback */
38           id = hook_op_check_stashchange (cv, my_callback, NULL);
39
40           /* unregister */
41           hook_op_check_stashchange_remove (id);
42

DESCRIPTION

Perl API

45   register
46           B::Hooks::OP::Check::
47
48           # or
49           my $id = B::Hooks::OP::Check::StashChange::register(\&callback);
50
51       Register "callback" when an opcode is being compiled in a different
52       namespace than the previous one.
53
54       An id that can be used for later removal of the handler using
55       "unregister" is returned.
56
57   unregister
58           B::Hooks::OP::Check::StashChange::unregister($id);
59
60       Disable the callback referenced by $id.
61

C API

63   TYPES
64       OP *(*hook_op_check_stashchange_cb) (pTHX_ OP *op, const char
65       *new_stash, const char *old_stash, void *user_data)
66
67       The type the callbacks need to implement.
68
69   FUNCTIONS
70       UV hook_op_check_stashchange (hook_op_check_stashchange_cb cb, void
71       *user_data)
72
73       Register the callback "cb" to be when an opcode is compiled in a
74       different namespace than the previous. "user_data" will be passed to
75       the callback as the last argument.
76
77       Returns an id that can be used to remove the handler using
78       "hook_op_check_stashchange_remove".
79
80       void *hook_op_check_stashchange_remove (UV id)
81
82       Remove a previously registered handler referred to by "id".
83
84       Returns the user data that was associated with the handler.
85

SEE ALSO

87       B::Hooks::OP::Check
88

AUTHOR

90       Florian Ragwitz <rafl@debian.org>
91
93       Copyright (c) 2008 Florian Ragwitz
94
95       This module is free software.
96
97       You may distribute this code under the same terms as Perl itself.
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101perl v5.30.0                      2019-07-26B::Hooks::OP::Check::StashChange(3)
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