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#!/usr/bin/perl -w
require 5.003;
sub readsyms (\%$) {
my ($syms, $file) = @_;
%$syms = ();
local (*FILE, $_);
open(FILE, "< $file")
or die "embed.pl: Can't open $file: $!\n";
while (<FILE>) {
s/[ \t]*#.*//; # Delete comments.
if (/^\s*(\S+)\s*$/) {
$$syms{$1} = 1;
}
}
close(FILE);
}
readsyms %global, 'global.sym';
readsyms %interp, 'interp.sym';
readsyms %compat3, 'compat3.sym';
sub hide ($$) {
my ($from, $to) = @_;
my $t = int(length($from) / 8);
"#define $from" . "\t" x ($t < 3 ? 3 - $t : 1) . "$to\n";
}
sub embed ($) {
my ($sym) = @_;
hide($sym, "Perl_$sym");
}
sub multon ($) {
my ($sym) = @_;
hide($sym, "(curinterp->I$sym)");
}
sub multoff ($) {
my ($sym) = @_;
hide("I$sym", $sym);
}
unlink 'embed.h';
open(EM, '> embed.h')
or die "Can't create embed.h: $!\n";
print EM <<'END';
/* !!!!!!! DO NOT EDIT THIS FILE !!!!!!!
This file is built by embed.pl from global.sym, interp.sym,
and compat3.sym. Any changes made here will be lost!
*/
/* (Doing namespace management portably in C is really gross.) */
/* EMBED has no run-time penalty, but helps keep the Perl namespace
from colliding with that used by other libraries pulled in
by extensions or by embedding perl. Allow a cc -DNO_EMBED
override, however, to keep binary compatability with previous
versions of perl.
*/
#ifndef NO_EMBED
# define EMBED 1
#endif
/* Hide global symbols? */
#ifdef EMBED
END
for $sym (sort keys %global) {
print EM embed($sym) unless $compat3{$sym};
}
print EM <<'END';
/* Hide global symbols that 5.003 revealed? */
#ifndef BINCOMPAT3
END
for $sym (sort keys %global) {
print EM embed($sym) if $compat3{$sym};
}
print EM <<'END';
#endif /* !BINCOMPAT3 */
#endif /* EMBED */
/* Put interpreter-specific symbols into a struct? */
#ifdef MULTIPLICITY
END
for $sym (sort keys %interp) {
print EM multon($sym);
}
print EM <<'END';
#else /* !MULTIPLICITY */
END
for $sym (sort keys %interp) {
print EM multoff($sym);
}
print EM <<'END';
/* Hide interpreter-specific symbols? */
#ifdef EMBED
END
for $sym (sort keys %interp) {
print EM embed($sym) if $compat3{$sym};
}
print EM <<'END';
/* Hide interpreter symbols that 5.003 revealed? */
#ifndef BINCOMPAT3
END
for $sym (sort keys %interp) {
print EM embed($sym) unless $compat3{$sym};
}
print EM <<'END';
#endif /* !BINCOMPAT3 */
#endif /* EMBED */
#endif /* MULTIPLICITY */
END
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