summaryrefslogtreecommitdiff
path: root/Master/tlpkg/tlperl/lib/ExtUtils/Constant/XS.pm
blob: 14eb80971466078dbbdf3696be5bb2026d7ba8ec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
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;