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Sergey Aleynikov

NAME

Sub::Disable - Remove function/method call from compiled code

SYNOPSIS

    use Sub::Disable 'debug', 'foo', 'bar'; # without specification - both method + sub form calls

    use Sub::Disable method => ['debug'];
    use Sub::Disable sub    => ['debug'];
    use Sub::Disable {
        method => ['foo'],
        sub    => ['bar'],
    };

    sub debug { warn "DEBUG INFO: @_" }

    __PACKAGE__->debug(some_heave_debug()); # no-op
    debug(even_more(), heavier_debug()); # no-op

DESCRIPTION

This module allows you to turn compile-time resolvable function or method call into no-op (together with all arguments' computations). This is useful for debugging and/or logging, when you don't want to make your production code slower.

Note that 'compile-time resolvable method call' is a method call on a literal package name

    Some::Package->method
    # or
    __PACKAGE__->method

and does not consider inheritance.

Sub::Disable distinguishes between sub and method calls and, by default, removes both of them. If you want to remove only one type, you should use specific import.

PERFORMACE

There's zero runtime overhead. Compile time overhead is negligible - on a test run it took an additional 0.2 ms during compilation of a large-scale project with 1200+ modules loaded.

CAVEATS

Sub::Disable will remove only those sub/method calls that were compiled after you have use'd it.

If you use Sub::Disable together with namespace::clean and you want to remove sub call, but not a method call, of a specific function, you should use Sub::Disable after using namespace::clean or exclude that method with '-except'.

SEE ALSO

B::Hooks::OP::Check and various OP_check[] related core stuff.

COPYRIGHT AND LICENSE

Copyright (C) 2015 by Sergey Aleynikov

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.1 or, at your option, any later version of Perl 5 you may have available.