ExtUtils::Typemaps::OutputMap - Entry in the OUTPUT section of a typemap
use ExtUtils::Typemaps; ... my $output = $typemap->get_output_map('T_NV'); my $code = $output->code(); $output->code("...");
Refer to ExtUtils::Typemaps for details.
Requires xstype and code parameters.
xstype
code
Returns or sets the OUTPUT mapping code for this entry.
Returns the name of the XS type of the OUTPUT map.
Returns a cleaned-up copy of the code to which certain transformations have been applied to make it more ANSI compliant.
This is an obscure but effective optimization that used to live in ExtUtils::ParseXS directly. Not implementing it should never result in incorrect use of typemaps, just less efficient code.
ExtUtils::ParseXS
In a nutshell, this will check whether the output code involves calling sv_setiv, sv_setuv, sv_setnv, sv_setpv or sv_setpvn to set the special $arg placeholder to a new value AT THE END OF THE OUTPUT CODE. If that is the case, the code is eligible for using the TARG-related macros to optimize this. Thus the name of the method: targetable.
sv_setiv
sv_setuv
sv_setnv
sv_setpv
sv_setpvn
$arg
TARG
targetable
If this optimization is applicable, ExtUtils::ParseXS will emit a dXSTARG; definition at the start of the generated XSUB code, and type (see below) dependent code to set TARG and push it on the stack at the end of the generated XSUB code.
dXSTARG;
If the optimization can not be applied, this returns undef. If it can be applied, this method returns a hash reference containing the following information:
type: Any of the characters i, u, n, p with_size: Bool indicating whether this is the sv_setpvn variant what: The code that actually evaluates to the output scalar what_size: If "with_size", this has the string length (as code, not constant, including leading comma)
ExtUtils::Typemaps
Steffen Mueller <smueller@cpan.org>
<smueller@cpan.org
Copyright 2009, 2010, 2011, 2012 Steffen Mueller
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
To install ExtUtils::ParseXS, copy and paste the appropriate command in to your terminal.
cpanm
cpanm ExtUtils::ParseXS
CPAN shell
perl -MCPAN -e shell install ExtUtils::ParseXS
For more information on module installation, please visit the detailed CPAN module installation guide.