#
# regen_perly.pl, DAPM 12-Feb-04
#
-# Copyright (c) 2004 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:
# #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
#
# it may work elsewhere but no specific attempt has been made to make it
# portable.
+use 5.006;
sub usage { die "usage: $0 [ -b bison_executable ] [ file.y ]\n" }
use warnings;
use strict;
+BEGIN { require 'regen/regen_lib.pl'; }
+
my $bison = 'bison';
if (@ARGV >= 2 and $ARGV[0] eq '-b') {
# this; 1.35+ does
# * Must produce output which is extractable by the regexes below
# * Must produce the right values.
-# These last two contstraints may well be met by earlier versions, but
+# These last two constraints may well be met by earlier versions, but
# I simply haven't tested them yet. If it works for you, then modify
# 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) { die <<EOF; }
+Could not find a version of bison in your path. Please install bison.
+EOF
+
+unless ($version =~ /\b(1\.875[a-z]?|2\.[01345])\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, 2.3, 2.4 or 2.5 is required. Try installing
+ http://ftp.gnu.org/gnu/bison/bison-2.5.1.tar.gz
or similar. Your bison identifies itself as:
$version
# creates $tmpc_file and $tmph_file
my_system("$bison -d -o $tmpc_file $y_file");
-open CTMPFILE, $tmpc_file or die "Can't open $tmpc_file: $!\n";
+open my $ctmp_fh, '<', $tmpc_file or die "Can't open $tmpc_file: $!\n";
my $clines;
-{ local $/; $clines = <CTMPFILE>; }
+{ local $/; $clines = <$ctmp_fh>; }
die "failed to read $tmpc_file: length mismatch\n"
unless length $clines == -s $tmpc_file;
-close CTMPFILE;
+close $ctmp_fh;
my ($actlines, $tablines) = extract($clines);
-chmod 0644, $act_file;
-open ACTFILE, ">$act_file" or die "can't open $act_file: $!\n";
-print ACTFILE $actlines;
-close ACTFILE;
-chmod 0444, $act_file;
+our %tokens;
+$tablines .= make_type_tab($y_file, $tablines);
+
+my ($act_fh, $tab_fh, $h_fh) = map {
+ open_new($_, '>', { by => $0, from => $y_file });
+} $act_file, $tab_file, $h_file;
+
+print $act_fh $actlines;
-chmod 0644, $tab_file;
-open TABFILE, ">$tab_file" or die "can't open $tab_file: $!\n";
-print TABFILE $tablines;
-close TABFILE;
-chmod 0444, $tab_file;
+print $tab_fh $tablines;
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 my $tmph_fh, '<', $tmph_file or die "Can't open $tmph_file: $!\n";
-open TMPH_FILE, $tmph_file or die "Can't open $tmph_file: $!\n";
-chmod 0644, $h_file;
-open H_FILE, ">$h_file" or die "Can't open $h_file: $!\n";
my $endcore_done = 0;
-while (<TMPH_FILE>) {
- print H_FILE "#ifdef PERL_CORE\n" if $. == 1;
+# Token macros need to be generated manually from bison 2.4 on
+my $gather_tokens = ($version =~ /\b2\.[45]\b/ ? undef : 0);
+my $tokens;
+while (<$tmph_fh>) {
+ print $h_fh "#ifdef PERL_CORE\n" if $. == 1;
if (!$endcore_done and /YYSTYPE_IS_DECLARED/) {
- print H_FILE "#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;
}
- s/"perlytmp.h"/"perly.h"/;
- print H_FILE $_;
+ next if /^#line \d+ ".*"/;
+ if (not defined $gather_tokens) {
+ $gather_tokens = 1 if /^\s* enum \s* yytokentype \s* \{/x;
+ }
+ elsif ($gather_tokens) {
+ if (/^\# \s* endif/x) { # The #endif just after the end of the token enum
+ $gather_tokens = 0;
+ $_ .= "\n/* Tokens. */\n$tokens";
+ }
+ else {
+ my ($tok, $val) = /(\w+) \s* = \s* (\d+)/x;
+ $tokens .= "#define $tok $val\n" if $tok;
+ }
+ }
+ print $h_fh $_;
}
-close TMPH_FILE;
-close H_FILE;
-chmod 0444, $h_file;
+close $tmph_fh;
unlink $tmph_file;
-print "rebuilt: $h_file $tab_file $act_file\n";
+foreach ($act_fh, $tab_fh, $h_fh) {
+ read_only_bottom_close_and_rename($_, ['regen_perly.pl', $y_file]);
+}
exit 0;
$clines =~ m@
switch \s* \( \s* \w+ \s* \) \s* { \s*
(
- case \s* \d+ \s* : \s*
- \#line [^\n]+"perly\.y"
+ case \s* \d+ \s* :
+ \s*
+ (?: \s* /\* .*? \*/ \s* )* # optional C-comments
+ \s*
+ \#line [^\n]+"\Q$y_file\E"
.*?
)
}
\s*
- ( \s* /\* .*? \*/ \s* )* # optional C-comments
+ (?: \s* /\* .*? \*/ \s* )* # optional C-comments
\s*
(
\#line[^\n]+\.c"
|
\#line[^\n]+\.simple"
+ |
+ YY_SYMBOL_PRINT
)
@xms
or die "Can't extract actions from $tmpc_file\n";
$actlines = $1;
+ # Remove extraneous comments from bison 2.4
+ $actlines =~ s!\s* /\* \s* Line \s* \d+ \s* of \s* yacc\.c \s* \*/!!gx;
+
+ # 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 %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*=/) {
+ 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: $_";
+ 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
+ (.*?)
+ ^};
+ /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",
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