autodie::Util - Internal Utility subroutines for autodie and Fatal
# INTERNAL API for autodie and Fatal only!
use autodie::Util qw(on_end_of_compile_scope);
on_end_of_compile_scope(sub { print "Hallo world\n"; });
Perl Programmers Reference Guide autodie::Util(3)
NAME
autodie::Util - Internal Utility subroutines for autodie and Fatal
SYNOPSIS
# INTERNAL API for autodie and Fatal only!
use autodie::Util qw(on_end_of_compile_scope);
on_end_of_compile_scope(sub { print "Hallo world\n"; });
DESCRIPTION
Interal Utilities for autodie and Fatal! This module is not a part of
autodie's public API.
This module contains utility subroutines for abstracting away the
underlying magic of autodie and (ab)uses of "%^H" to call subs at the
end of a (compile-time) scopes.
Note that due to how "%^H" works, some of these utilities are only
useful during the compilation phase of a perl module and relies on the
internals of how perl handles references in "%^H".
Methods
on_end_of_compile_scope
on_end_of_compile_scope(sub { print "Hallo world\n"; });
Will invoke a sub at the end of a (compile-time) scope. The sub is
called once with no arguments. Can be called multiple times (even in
the same "compile-time" scope) to install multiple subs. Subs are
called in a "first-in-last-out"-order (FILO or "stack"-order).
fill_protos
fill_protos('*$$;$@')
Given a Perl subroutine prototype, return a list of invocation
specifications. Each specification is a listref, where the first
member is the (minimum) number of arguments for this invocation
specification. The remaining arguments are a string representation of
how to pass the arguments correctly to a sub with the given prototype,
when called with the given number of arguments.
The specifications are returned in increasing order of arguments
starting at 0 (e.g. ';$') or 1 (e.g. '$@'). Note that if the
prototype is "slurpy" (e.g. ends with a "@"), the number of arguments
for the last specification is a "minimum" number rather than an exact
number. This can be detected by the last member of the last
specification matching m/[@#]_/.
make_core_trampoline
make_core_trampoline('CORE::open', 'main', prototype('CORE::open'))
Creates a trampoline for calling a core sub. Essentially, a tiny sub
that figures out how we should be calling our core sub, puts in the
arguments in the right way, and bounces our control over to it.
If we could reliably use `goto &` on core builtins, we wouldn't need
this subroutine.
install_subs
install_subs('My::Module', { 'read' => sub { die("Hallo\n"), ... }})
Given a package name and a hashref mapping names to a subroutine
reference (or "undef"), this subroutine will install said subroutines
on their given name in that module. If a name mapes to "undef", any
subroutine with that name in the target module will be remove (possibly
"unshadowing" a CORE sub of same name).
AUTHOR
Copyright 2013-2014, Niels Thykier <niels@thykier.net>
LICENSE
This module is free software. You may distribute it under the same
terms as Perl itself.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+-----------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------------+
|Availability | runtime/perl-532 |
+---------------+-----------------------+
|Stability | Pass-through volatile |
+---------------+-----------------------+
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from
http://www.cpan.org/src/5.0/perl-5.32.0.tar.gz.
Further information about this software can be found on the open source
community website at https://www.perl.org/.
perl v5.32.0 2020-06-14 autodie::Util(3)