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|
#!/usr/bin/perl
use strict;
use 5.6.0;
use warnings;
# This perl script generates a C program which generates a perl
# script. It's gonna get ugly.
my @types = ('char', 'signed char', 'unsigned char', 'short',
'unsigned short', 'int', 'unsigned', 'long', 'unsigned long',
'long long', 'unsigned long long', 'float', 'double', 'long double',
'_Bool', 'void *', 'enum null_enum');
sub mangle_typename
{
my $name = shift;
$name =~ s/\*/ptr/g;
$name =~ s/[^\w]/_/g;
return $name;
}
sub print_align_struct
{
my $type = shift;
my $name = mangle_typename($type);
print <<"END";
struct align_$name
{
char pad;
$type object;
};
END
}
print <<END;
enum null_enum {enumerator};
END
print_align_struct($_) foreach @types;
print <<END;
#include <stddef.h>
#include <limits.h>
#include <stdio.h>
int
main(void)
{
printf("package CType::Native;\\n");
printf("\\n");
printf("use 5.6.0;\\n");
printf("use strict;\\n");
printf("use warnings;\\n");
printf("\\n");
printf("use bigint;\\n");
printf("use CType::Fundamental qw/register_type_attrs/;\\n");
printf("\\n");
END
# We can't use gcc's __alignof__ function because it's
# broken. __alignof__(double) returns 8 on i686-linux-gnu, but the
# correct value is 4. Instead we'll examine how a struct is laid out,
# to deduce the alignment actually used.
sub alignof
{
my $type = shift;
my $name = mangle_typename($type);
return "offsetof(struct align_$name, object) * 8";
}
sub signof
{
my $type = shift;
return "((($type) -1) < 0)";
}
sub sizeof
{
my $type = shift;
return "sizeof($type) * 8";
}
my %printf_limit_values = ('long' => '%ld',
'unsigned long' => '%lu',
'long long' => '%lld',
'unsigned long long' => '%llu',
);
my %limit_values = ('char' => 'CHAR',
'signed char' => 'SCHAR',
'unsigned char' => 'UCHAR',
'short' => 'SHRT',
'unsigned short' => 'USHRT',
'int' => 'INT',
'unsigned' => 'UINT',
'long' => 'LONG',
'unsigned long' => 'ULONG',
'long long' => 'LLONG',
'unsigned long long' => 'ULLONG'
);
sub printf_limit_min
{
my $type = shift;
return '\%d' unless $printf_limit_values{$type};
return '\%d' if $type =~ /unsigned/;
return $printf_limit_values{$type};
}
sub printf_limit_max
{
my $type = shift;
return '\%d' unless $printf_limit_values{$type};
return $printf_limit_values{$type};
}
sub minof
{
my $type = shift;
return '0' unless $limit_values{$type};
return '0' if $type =~ /unsigned/;
return $limit_values{$type} . '_MIN';
}
sub maxof
{
my $type = shift;
return '0' unless $limit_values{$type};
return $limit_values{$type} . '_MAX';
}
sub print_register_attrs
{
my $type = shift;
my $ln = printf_limit_min($type);
my $lx = printf_limit_max($type);
print " printf(\"register_type_attrs('$type', \%d, \%d, \%d, $ln, $lx);\\n\",\n";
print " " . sizeof($type) . ", " . alignof($type) . ", " . signof($type) . ",\n";
print " " . minof($type) . ", " . maxof($type) . ");\n";
}
print_register_attrs($_) foreach @types;
print <<END;
printf("\\n");
printf("1;\\n");
return 0;
}
END
|
