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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 <nick@ccl4.org> based on the code in C<h2xs> 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;"; } sub return_statement_for_notdef { # my ($self) = @_; "return PERL_constant_NOTDEF;"; } sub return_statement_for_notfound { # my ($self) = @_; "return PERL_constant_NOTFOUND;"; } sub default_type { 'IV'; } sub macro_from_name { my ($self, $item) = @_; my $macro = $item->{name}; $macro = $item->{value} unless defined $macro; $macro; } sub macro_from_item { my ($self, $item) = @_; my $macro = $item->{macro}; $macro = $self->macro_from_name($item) unless defined $macro; $macro; } # Keep to the traditional perl source macro sub memEQ { "memEQ"; } sub params { my ($self, $what) = @_; foreach (sort keys %$what) { warn "ExtUtils::Constant doesn't know how to handle values of type $_" unless defined $XS_Constant{$_}; } my $params = {}; $params->{''} = 1 if $what->{''}; $params->{IV} = 1 if $what->{IV} || $what->{UV} || $what->{PVN}; $params->{NV} = 1 if $what->{NV}; $params->{PV} = 1 if $what->{PV} || $what->{PVN}; $params->{SV} = 1 if $what->{SV}; return $params; } sub C_constant_prefix_param { "aTHX_ "; } sub C_constant_prefix_param_defintion { "pTHX_ "; } sub namelen_param_definition { 'STRLEN ' . $_[0] -> namelen_param; } sub C_constant_other_params_defintion { my ($self, $params) = @_; my $body = ''; $body .= ", int utf8" if $params->{''}; $body .= ", IV *iv_return" if $params->{IV}; $body .= ", NV *nv_return" if $params->{NV}; $body .= ", const char **pv_return" if $params->{PV}; $body .= ", SV **sv_return" if $params->{SV}; $body; } sub C_constant_other_params { my ($self, $params) = @_; my $body = ''; $body .= ", utf8" if $params->{''}; $body .= ", iv_return" if $params->{IV}; $body .= ", nv_return" if $params->{NV}; $body .= ", pv_return" if $params->{PV}; $body .= ", sv_return" if $params->{SV}; $body; } sub dogfood { my ($self, $args, @items) = @_; my ($package, $subname, $default_type, $what, $indent, $breakout) = @{$args}{qw(package subname default_type what indent breakout)}; my $result = <<"EOT"; /* When generated this function returned values for the list of names given in this section of perl code. Rather than manually editing these functions to add or remove constants, which would result in this comment and section of code becoming inaccurate, we recommend that you edit this section of code, and use it to regenerate a new set of constant functions which you then use to replace the originals. Regenerate these constant functions by feeding this entire source file to perl -x #!$^X -w use ExtUtils::Constant qw (constant_types C_constant XS_constant); EOT $result .= $self->dump_names ({default_type=>$default_type, what=>$what, indent=>0, declare_types=>1}, @items); $result .= <<'EOT'; print constant_types(), "\n"; # macro defs EOT $package = perl_stringify($package); $result .= "foreach (C_constant (\"$package\", '$subname', '$default_type', \$types, "; # The form of the indent parameter isn't defined. (Yet) if (defined $indent) { require Data::Dumper; $Data::Dumper::Terse=1; $Data::Dumper::Terse=1; # Not used once. :-) chomp ($indent = Data::Dumper::Dumper ($indent)); $result .= $indent; } else { $result .= 'undef'; } $result .= ", $breakout" . ', @names) ) { print $_, "\n"; # C constant subs } print "\n#### XS Section:\n"; print XS_constant ("' . $package . '", $types); __END__ */ '; $result; } 1;