#
# regen_perly.pl, DAPM 12-Feb-04
#
-# Copyright (c) 2004, 2005 Larry Wall
+# Copyright (c) 2004, 2005, 2006, 2009, 2010, 2011 Larry Wall
#
# Given an input file perly.y, run bison on it and produce
# the following output files:
use warnings;
use strict;
-BEGIN { require 'regen/regen_lib.pl'; }
+our $Verbose;
+BEGIN { require './regen/regen_lib.pl'; }
my $bison = 'bison';
Could not find a version of bison in your path. Please install bison.
EOF
-unless ($version =~ /\b(1\.875[a-z]?|2\.[0134])\b/) { die <<EOF; }
+# Don't change this to add new bison versions without testing that the generated
+# files actually work :-) Win32 in particular may not like them. :-(
+unless ($version =~ /\b(1\.875[a-z]?|2\.[0134567]|3\.[0])\b/) { die <<EOF; }
-You have the wrong version of bison in your path; currently 1.875
-2.0, 2.1, 2.3 or 2.4 is required. Try installing
- http://ftp.gnu.org/gnu/bison/bison-2.4.1.tar.gz
+You have the wrong version of bison in your path; currently versions
+1.875, 2.0-2.7 or 3.0 are known to work. Try installing
+ http://ftp.gnu.org/gnu/bison/bison-2.5.1.tar.gz
or similar. Your bison identifies itself as:
$version
EOF
+# bison's version number, not the entire string, is most useful later on.
+$version = $1;
+
# creates $tmpc_file and $tmph_file
my_system("$bison -d -o $tmpc_file $y_file");
my ($actlines, $tablines) = extract($clines);
+our %tokens;
$tablines .= make_type_tab($y_file, $tablines);
-my $read_only = read_only_top(lang => 'C', by => $0, from => $y_file);
+my ($act_fh, $tab_fh, $h_fh) = map {
+ open_new($_, '>', { by => $0, from => $y_file });
+} $act_file, $tab_file, $h_file;
-my $act_fh = safer_open("$act_file-new", $act_file);
-print $act_fh $read_only, $actlines;
+print $act_fh $actlines;
-my $tab_fh = safer_open("$tab_file-new", $tab_file);
-print $tab_fh $read_only, $tablines;
+print $tab_fh $tablines;
unlink $tmpc_file;
# C<#line 188 "perlytmp.h"> gets picked up by make depend, so remove them.
open my $tmph_fh, '<', $tmph_file or die "Can't open $tmph_file: $!\n";
-my $h_fh = safer_open("$h_file-new", $h_file);
-print $h_fh $read_only;
+# add integer-encoded #def of the bison version
+
+{
+ $version =~ /^(\d+)\.(\d+)/
+ or die "Can't handle bison version format: '$version'";
+ my ($v1,$v2) = ($1,$2);
+ die "Unexpectedly large bison version '$v1'" if $v1 > 99;
+ die "Unexpectedly large bison subversion '$v2'" if $v2 > 9999;
+
+ printf $h_fh "#define PERL_BISON_VERSION %2d%04d\n\n", $v1, $v2;
+}
my $endcore_done = 0;
-# Token macros need to be generated manually on bison 2.4
-my $gather_tokens = ($version =~ /\b2\.4\b/ ? undef : 0);
+# Token macros need to be generated manually from bison 2.4 on
+my $gather_tokens = $version >= 2.4 ? undef : 0;
my $tokens;
while (<$tmph_fh>) {
+ # bison 2.6 adds header guards, which break things because of where we
+ # insert #ifdef PERL_CORE, so strip them because they aren't important
+ next if /YY_PERLYTMP_H/;
+
print $h_fh "#ifdef PERL_CORE\n" if $. == 1;
if (!$endcore_done and /YYSTYPE_IS_DECLARED/) {
- print $h_fh "#endif /* PERL_CORE */\n";
+ print $h_fh <<h;
+#ifdef PERL_IN_TOKE_C
+static bool
+S_is_opval_token(int type) {
+ switch (type) {
+h
+ print $h_fh <<i for sort grep $tokens{$_} eq 'opval', keys %tokens;
+ case $_:
+i
+ print $h_fh <<j;
+ return 1;
+ }
+ return 0;
+}
+#endif /* PERL_IN_TOKE_C */
+#endif /* PERL_CORE */
+j
$endcore_done = 1;
}
next if /^#line \d+ ".*"/;
exit 0;
+# extract the tables and actions from the generated .c file
+
sub extract {
my $clines = shift;
my $tablines;
my $actlines;
+ my $last_table = $version >= 3 ? 'yyr2' : 'yystos';
$clines =~ m@
(?:
^/* YYFINAL[^\n]+\n #optional comment
)?
\# \s* define \s* YYFINAL # first #define
.*? # other defines + most tables
- yystos\[\]\s*= # start of last table
+ $last_table\[\]\s*= # start of last table
.*?
}\s*; # end of last table
@xms
$tablines = $&;
+ # extract all the cases in the big action switch statement
+
$clines =~ m@
- switch \s* \( \s* \w+ \s* \) \s* { \s*
- (
- case \s* \d+ \s* :
- \s*
- (?: \s* /\* .*? \*/ \s* )* # optional C-comments
- \s*
- \#line [^\n]+"\Q$y_file\E"
- .*?
- )
- }
- \s*
- (?: \s* /\* .*? \*/ \s* )* # optional C-comments
- \s*
- (
- \#line[^\n]+\.c"
- |
- \#line[^\n]+\.simple"
- |
- YY_SYMBOL_PRINT
- )
+ switch \s* \( \s* yyn \s* \) \s* { \s*
+ ( .*? default: \s* break; \s* )
+ }
@xms
or die "Can't extract actions from $tmpc_file\n";
$actlines = $1;
sub make_type_tab {
my ($y_file, $tablines) = @_;
+ my %just_tokens;
my %tokens;
my %types;
my $default_token;
open my $fh, '<', $y_file or die "Can't open $y_file: $!\n";
while (<$fh>) {
- if (/(\$\d+)\s*=/) {
+ if (/(\$\d+)\s*=[^=]/) {
warn "$y_file:$.: dangerous assignment to $1: $_";
}
}
next unless /^%(token|type)/;
- s/^%(token|type)\s+<(\w+)>\s+//
+ s/^%((token)|type)\s+<(\w+)>\s+//
or die "$y_file: unparseable token/type line: $_";
- $tokens{$_} = $2 for (split ' ', $_);
- $types{$2} = 1;
+ for (split ' ', $_) {
+ $tokens{$_} = $3;
+ if ($2) {
+ $just_tokens{$_} = $3;
+ }
+ }
+ $types{$3} = 1;
}
+ *tokens = \%just_tokens; # perly.h needs this
die "$y_file: no __DEFAULT__ token defined\n" unless $default_token;
$types{$default_token} = 1;
$tablines =~ /^\Qstatic const char *const yytname[] =\E\n
- {\n
+ \{\n
(.*?)
^};
/xsm
{ "toketype_" .
(defined $tokens{$1} ? $tokens{$1} : $default_token)
}ge;
- $fields =~ s/, \s* 0 \s* $//x
+ $fields =~ s/, \s* (?:0|YY_NULL|YY_NULLPTR) \s* $//x
or die "make_type_tab: couldn't delete trailing ',0'\n";
return
sub my_system {
+ if ($Verbose) {
+ print "executing: @_\n";
+ }
system(@_);
if ($? == -1) {
die "failed to execute command '@_': $!\n";
https://perl5.git.perl.org / perl5.git / blobdiff