#
# regen_perly.pl, DAPM 12-Feb-04
#
-# Copyright (c) 2004 Larry Wall
+# Copyright (c) 2004, 2005 Larry Wall
#
# Given an input file perly.y, run bison on it and produce
# the following output files:
# #line directives plus adding a #ifdef PERL_CORE
#
# perly.tab the parser table C definitions extracted from the bison output
+# plus an extra table generated by this script.
#
# perly.act the action case statements extracted from the bison output
#
# the test below to allow that version too. DAPM Feb 04.
my $version = `$bison -V`;
-unless ($version =~ /\b(1\.875|2\.0)\b/) { die <<EOF; }
+unless ($version =~ /\b(1\.875[a-z]?|2\.[013])\b/) { die <<EOF; }
You have the wrong version of bison in your path; currently 1.875
-or 2.0 is required. Try installing
- http://ftp.gnu.org/gnu/bison/bison-2.0.tar.gz
-or
- http://ftp.gnu.org/gnu/bison/bison-1.875.tar.bz2
+2.0, 2.1 or 2.3 is required. Try installing
+ http://ftp.gnu.org/gnu/bison/bison-2.1.tar.gz
or similar. Your bison identifies itself as:
$version
my ($actlines, $tablines) = extract($clines);
+$tablines .= make_type_tab($y_file, $tablines);
+
chmod 0644, $act_file;
open ACTFILE, ">$act_file" or die "can't open $act_file: $!\n";
print ACTFILE $actlines;
unlink $tmpc_file;
# Wrap PERL_CORE round the symbol definitions. Also, the
-# C<#line 123 "perlytmp.h"> gets picked up by make depend, so change it.
+# C<#line 30 "perly.y"> confuses the Win32 resource compiler and the
+# C<#line 188 "perlytmp.h"> gets picked up by make depend, so remove them.
open TMPH_FILE, $tmph_file or die "Can't open $tmph_file: $!\n";
chmod 0644, $h_file;
print H_FILE "#endif /* PERL_CORE */\n";
$endcore_done = 1;
}
- s/"perlytmp.h"/"perly.h"/;
+ next if /^#line \d+ ".*"/;
print H_FILE $_;
}
close TMPH_FILE;
switch \s* \( \s* \w+ \s* \) \s* { \s*
(
case \s* \d+ \s* : \s*
- \#line [^\n]+"perly\.y"
+ \#line [^\n]+"\Q$y_file\E"
.*?
)
}
\#line[^\n]+\.c"
|
\#line[^\n]+\.simple"
+ |
+ YY_SYMBOL_PRINT
)
@xms
or die "Can't extract actions from $tmpc_file\n";
$actlines = $1;
+ # C<#line 188 "perlytmp.c"> gets picked up by make depend, so remove them.
+ $actlines =~ s/^#line \d+ "\Q$tmpc_file\E".*$//gm;
+
+ # convert yyvsp[nnn] into ps[nnn].val
+
+ $actlines =~ s/yyvsp\[(.*?)\]/ps[$1].val/g
+ or die "Can't convert value stack name\n";
+
return $actlines. "\n", $tablines. "\n";
}
-
-
+# Generate a table, yy_type_tab[], that specifies for each token, what
+# type of value it holds.
+#
+# Read the .y file and extract a list of all the token names and
+# non-terminal names; then scan the string $tablines for the table yytname,
+# which gives the token index of each token/non-terminal; then use this to
+# create yy_type_tab.
+#
+# ie given (in perly.y),
+#
+# %token <opval> A
+# %token <ival> B
+# %type <pval> C
+# %type <opval> D
+#
+# and (in $tablines),
+#
+# yytname[] = { "A" "B", "C", "D", "E" };
+#
+# then return
+#
+# typedef enum { toketype_ival, toketype_opval, toketype_pval } toketypes;
+#
+# static const toketypes yy_type_tab[]
+# = { toketype_opval, toketype_ival, toketype_pval,
+# toketype_opval, toketype_ival }
+#
+# where "E" has the default type. The default type is determined
+# by the __DEFAULT__ comment next to the appropriate union member in
+# perly.y
+
+sub make_type_tab {
+ my ($y_file, $tablines) = @_;
+ 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*=/) {
+ warn "$y_file:$.: dangerous assignment to $1: $_";
+ }
+
+ if (/__DEFAULT__/) {
+ m{(\w+) \s* ; \s* /\* \s* __DEFAULT__}x
+ or die "$y_file: can't parse __DEFAULT__ line: $_";
+ die "$y_file: duplicate __DEFAULT__ line: $_"
+ if defined $default_token;
+ $default_token = $1;
+ next;
+ }
+
+ next unless /^%(token|type)/;
+ s/^%(token|type)\s+<(\w+)>\s+//
+ or die "$y_file: unparseable token/type line: $_";
+ $tokens{$_} = $2 for (split ' ', $_);
+ $types{$2} = 1;
+ }
+ die "$y_file: no __DEFAULT__ token defined\n" unless $default_token;
+ $types{$default_token} = 1;
+
+ $tablines =~ /^\Qstatic const char *const yytname[] =\E\n
+ {\n
+ (.*?)
+ ^};
+ /xsm
+ or die "Can't extract yytname[] from table string\n";
+ my $fields = $1;
+ $fields =~ s{"([^"]+)"}
+ { "toketype_" .
+ (defined $tokens{$1} ? $tokens{$1} : $default_token)
+ }ge;
+ $fields =~ s/, \s* 0 \s* $//x
+ or die "make_type_tab: couldn't delete trailing ',0'\n";
+
+ return
+ "\ntypedef enum {\n\t"
+ . join(", ", map "toketype_$_", sort keys %types)
+ . "\n} toketypes;\n\n"
+ . "/* type of each token/terminal */\n"
+ . "static const toketypes yy_type_tab[] =\n{\n"
+ . $fields
+ . "\n};\n";
+}
sub my_system {
system(@_);
if ($? == -1) {
- die "failed to execute comamnd '@_': $!\n";
+ die "failed to execute command '@_': $!\n";
}
elsif ($? & 127) {
die sprintf "command '@_' died with signal %d\n",
https://perl5.git.perl.org / perl5.git / blobdiff