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=head1 NAME

ExtUtils::ParseXS - converts Perl XS code into C code

=head1 SYNOPSIS

  use ExtUtils::ParseXS qw(process_file);

  process_file( filename => 'foo.xs' );

  process_file( filename => 'foo.xs',
                output => 'bar.c',
                'C++' => 1,
                typemap => 'path/to/typemap',
                hiertype => 1,
                except => 1,
                prototypes => 1,
                versioncheck => 1,
                linenumbers => 1,
                optimize => 1,
                prototypes => 1,
              );

=head1 DESCRIPTION

C<ExtUtils::ParseXS> will compile XS code into C code by embedding the constructs
necessary to let C functions manipulate Perl values and creates the glue
necessary to let Perl access those functions.  The compiler uses typemaps to
determine how to map C function parameters and variables to Perl values.

The compiler will search for typemap files called I<typemap>.  It will use
the following search path to find default typemaps, with the rightmost
typemap taking precedence.

    ../../../typemap:../../typemap:../typemap:typemap

=head1 EXPORT

None by default.  C<process_file()> may be exported upon request.

=head1 FUNCTIONS

=over 4

=item process_file()

This function processes an XS file and sends output to a C file.
Named parameters control how the processing is done.  The following
parameters are accepted:

=over 4

=item B<C++>

Adds C<extern "C"> to the C code.  Default is false.

=item B<hiertype>

Retains C<::> in type names so that C++ hierarchical types can be
mapped.  Default is false.

=item B<except>

Adds exception handling stubs to the C code.  Default is false.

=item B<typemap>

Indicates that a user-supplied typemap should take precedence over the
default typemaps.  A single typemap may be specified as a string, or
multiple typemaps can be specified in an array reference, with the
last typemap having the highest precedence.

=item B<prototypes>

Generates prototype code for all xsubs.  Default is false.

=item B<versioncheck>

Makes sure at run time that the object file (derived from the C<.xs>
file) and the C<.pm> files have the same version number.  Default is
true.

=item B<linenumbers>

Adds C<#line> directives to the C output so error messages will look
like they came from the original XS file.  Default is true.

=item B<optimize>

Enables certain optimizations.  The only optimization that is currently
affected is the use of I<target>s by the output C code (see L<perlguts>).
Not optimizing may significantly slow down the generated code, but this is the way
B<xsubpp> of 5.005 and earlier operated.  Default is to optimize.

=item B<inout>

Enable recognition of C<IN>, C<OUT_LIST> and C<INOUT_LIST>
declarations.  Default is true.

=item B<argtypes>

Enable recognition of ANSI-like descriptions of function signature.
Default is true.

=item B<s>

I<Maintainer note:> I have no clue what this does.  Strips function prefixes?

=back

=item errors()

This function returns the number of [a certain kind of] errors
encountered during processing of the XS file.

=back

=head1 AUTHOR

Based on xsubpp code, written by Larry Wall.

Maintained by:

=over 4

=item *

Ken Williams, <ken@mathforum.org>

=item *

David Golden, <dagolden@cpan.org>

=item *

James Keenan, <jkeenan@cpan.org>

=item *

Steffen Mueller, <smueller@cpan.org>

=back

=head1 COPYRIGHT

Copyright 2002-2012 by Ken Williams, David Golden and other contributors.  All
rights reserved.

This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

Based on the C<ExtUtils::xsubpp> code by Larry Wall and the Perl 5
Porters, which was released under the same license terms.

=head1 SEE ALSO

L<perl>, ExtUtils::xsubpp, ExtUtils::MakeMaker, L<perlxs>, L<perlxstut>.

=cut

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