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&=LV[(ÁÄ Ñ package ExtUtils::Constant::XS;
use strict;
use vars qw($VERSION %XS_Constant %XS_TypeSet @ISA @EXPORT_OK $is_perl56);
use Carp;
use ExtUtils::Constant::Utils 'perl_stringify';
require ExtUtils::Constant::Base;
@ISA = qw(ExtUtils::Constant::Base Exporter);
@EXPORT_OK = qw(%XS_Constant %XS_TypeSet);
$VERSION = '0.03';
$is_perl56 = ($] < 5.007 && $] > 5.005_50);
=head1 NAME
ExtUtils::Constant::XS - generate C code for XS modules' constants.
=head1 SYNOPSIS
require ExtUtils::Constant::XS;
=head1 DESCRIPTION
ExtUtils::Constant::XS overrides ExtUtils::Constant::Base to generate C
code for XS modules' constants.
=head1 BUGS
Nothing is documented.
Probably others.
=head1 AUTHOR
Nicholas Clark based on the code in C by Larry Wall and
others
=cut
# '' is used as a flag to indicate non-ascii macro names, and hence the need
# to pass in the utf8 on/off flag.
%XS_Constant = (
'' => '',
IV => 'PUSHi(iv)',
UV => 'PUSHu((UV)iv)',
NV => 'PUSHn(nv)',
PV => 'PUSHp(pv, strlen(pv))',
PVN => 'PUSHp(pv, iv)',
SV => 'PUSHs(sv)',
YES => 'PUSHs(&PL_sv_yes)',
NO => 'PUSHs(&PL_sv_no)',
UNDEF => '', # implicit undef
);
%XS_TypeSet = (
IV => '*iv_return = ',
UV => '*iv_return = (IV)',
NV => '*nv_return = ',
PV => '*pv_return = ',
PVN => ['*pv_return = ', '*iv_return = (IV)'],
SV => '*sv_return = ',
YES => undef,
NO => undef,
UNDEF => undef,
);
sub header {
my $start = 1;
my @lines;
push @lines, "#define PERL_constant_NOTFOUND\t$start\n"; $start++;
push @lines, "#define PERL_constant_NOTDEF\t$start\n"; $start++;
foreach (sort keys %XS_Constant) {
next if $_ eq '';
push @lines, "#define PERL_constant_IS$_\t$start\n"; $start++;
}
push @lines, << 'EOT';
#ifndef NVTYPE
typedef double NV; /* 5.6 and later define NVTYPE, and typedef NV to it. */
#endif
#ifndef aTHX_
#define aTHX_ /* 5.6 or later define this for threading support. */
#endif
#ifndef pTHX_
#define pTHX_ /* 5.6 or later define this for threading support. */
#endif
EOT
return join '', @lines;
}
sub valid_type {
my ($self, $type) = @_;
return exists $XS_TypeSet{$type};
}
# This might actually be a return statement
sub assignment_clause_for_type {
my $self = shift;
my $args = shift;
my $type = $args->{type};
my $typeset = $XS_TypeSet{$type};
if (ref $typeset) {
die "Type $type is aggregate, but only single value given"
if @_ == 1;
return map {"$typeset->[$_]$_[$_];"} 0 .. $#$typeset;
} elsif (defined $typeset) {
confess "Aggregate value given for type $type"
if @_ > 1;
return "$typeset$_[0];";
}
return ();
}
sub return_statement_for_type {
my ($self, $type) = @_;
# In the future may pass in an options hash
$type = $type->{type} if ref $type;
"return PERL_constant_IS$type;";