103 lines
3.1 KiB
Perl
Executable File
103 lines
3.1 KiB
Perl
Executable File
#!/usr/bin/perl -s
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# Copyright 2003, 2004, 2005, 2012, 2013 Red Hat, Inc.
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#
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# This file is part of Cygwin.
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#
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# This software is a copyrighted work licensed under the terms of the
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# Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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# details.
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#
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my $tls = shift;
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my $tls_out = shift;
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my $tgt = shift;
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# FIXME? This method obviously requires a 64 bit OS to build tlsoffsets64.h
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# Another method which doesn't requires to run an executable would be to
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# generate assembler code accessing the various struct members and analyzing
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# it, but that's arguably a lot more effort.
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my $tgt_opt='-m64';
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$tgt_opt='-m32' unless ($tgt eq 'x86_64');
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open(TLS, $tls) or die "$0: couldn't open tls file \"$tls\" - $!\n";
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my $struct = '';
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my @fields = ();
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my $def = '';
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$tls = join('', <TLS>);
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$tls =~ s/\A.*\n#pragma once\n//os;
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$tls =~ s/\n[^\n]*gentls_offsets[^\n]*\n(.+)\Z/$1/os;
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my $pre = $`;
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substr($tls, 0, length($pre)) = '';
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$pre .= "\n//*/";
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$tls =~ s%/\*\s*gentls_offsets.*?/\*\s*gentls_offsets\s*\*/%%ogs;
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foreach ($tls =~ /^.*\n/mg) {
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/^}|\s*(?:typedef|const)/o and do {
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$def .= $_ ;
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next;
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};
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$def .= $_ if $struct;
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if (!s/;.*$//o) {
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if (!$struct && /^\s*(?:struct|class)\s*([a-z_0-9]+)/o) {
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$def .= $_;
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$struct = $1
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}
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next;
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}
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s/(?:\[[^\]]*\]|struct|class)//o;
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s/^\s+\S+\s+//o;
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s/[\*\s()]+//go;
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for my $f (split(/,/)) {
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push(@fields, $f);
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}
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}
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close TLS;
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open(TMP, '>', "/tmp/$$.cc") or die "$0: couldn't open temporary index file \"/tmp/$$.c\" - $!\n";
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print TMP <<EOF;
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#define __INSIDE_CYGWIN__
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#ifndef __x86_64__
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#define __attribute__(X)
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#endif
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#define __reg1
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#define __reg2
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#define __reg3
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <windows.h>
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$pre
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$def
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int
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main(int argc, char **argv)
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{
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$struct *foo;
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# define foo_beg ((char *) foo)
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# define offset(f) ((int) (((char *) &(foo->f)) - foo_beg) - CYGTLS_PADSIZE)
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# define poffset(f) (((char *) &(foo->f)) - ((char *) foo))
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EOF
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print TMP 'puts ("//;# autogenerated: Do not edit.\n");', "\n\n";
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print TMP "printf (\"//; \$tls::start_offset = -%d;\\n\", CYGTLS_PADSIZE);\n";
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for my $f (@fields) {
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print TMP ' printf ("//; $tls::', $f, ' = %d;\n", ', "offset($f));\n";
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print TMP ' printf ("//; $tls::p', $f, ' = %d;\n", ', "poffset($f));\n";
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}
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print TMP ' puts ("//; __DATA__\n");', "\n";
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for my $f (@fields) {
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print TMP ' printf ("#define tls_', $f, ' (%d)\n", ', "offset($f));\n";
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print TMP ' printf ("#define tls_p', $f, ' (%d)\n", ', "poffset($f));\n";
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}
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print TMP <<EOF;
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exit (0);
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}
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EOF
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close TMP;
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system @ARGV, '-o', "/tmp/$$-1.cc", '-E', "/tmp/$$.cc";
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system 'g++', "$tgt_opt", '-o', "/tmp/$$.a.out", "/tmp/$$-1.cc" and
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($? == 127 && system 'c++', "$tgt_opt", '-o', "/tmp/$$.a.out", "/tmp/$$-1.cc") and
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die "$0: couldn't generate executable for offset calculation \"/tmp/$$.a.out\" - $!\n";
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open(TLS_OUT, '>', $tls_out) or die "$0: couldn't open tls index file \"$tls_out\" - $!\n";
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open(OFFS, "/tmp/$$.a.out|") or die "$0: couldn't run \"/tmp/$$.a.out\" - $!\n";
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print TLS_OUT <OFFS>;
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close OFFS;
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close TLS_OUT;
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unlink "/tmp/$$.cc", "/tmp/$$-1.cc", "/tmp/$$-1.d", "/tmp/$$.a.out";
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exit(0);
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