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Fix the last 2 perly.y specific parts of regen_perly.pl, and make
[perl5.git] / regen_perly.pl
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1#!/usr/bin/perl
2#
3# regen_perly.pl, DAPM 12-Feb-04
4#
1d325971 5# Copyright (c) 2004, 2005 Larry Wall
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6#
7# Given an input file perly.y, run bison on it and produce
8# the following output files:
9#
10# perly.h standard bison header file with minor doctoring of
11# #line directives plus adding a #ifdef PERL_CORE
12#
13# perly.tab the parser table C definitions extracted from the bison output
14#
15# perly.act the action case statements extracted from the bison output
16#
17# Note that perly.c is *not* regenerated - this is now a static file which
18# is not dependent on perly.y any more.
19#
20# If a filename of the form foo.y is given on the command line, then
21# this is used instead as the basename for all the files mentioned
22# above.
23#
24# Note that temporary files of the form perlytmp.h and perlytmp.c are
25# created and then deleted during this process
26#
27# Note also that this script is intended to be run on a UNIX system;
28# it may work elsewhere but no specific attempt has been made to make it
29# portable.
30
31sub usage { die "usage: $0 [ -b bison_executable ] [ file.y ]\n" }
32
33use warnings;
34use strict;
35
36my $bison = 'bison';
37
38if (@ARGV >= 2 and $ARGV[0] eq '-b') {
39 shift;
40 $bison = shift;
41}
42
43my $y_file = shift || 'perly.y';
44
45usage unless @ARGV==0 && $y_file =~ /\.y$/;
46
47(my $h_file = $y_file) =~ s/\.y$/.h/;
48(my $act_file = $y_file) =~ s/\.y$/.act/;
49(my $tab_file = $y_file) =~ s/\.y$/.tab/;
50(my $tmpc_file = $y_file) =~ s/\.y$/tmp.c/;
51(my $tmph_file = $y_file) =~ s/\.y$/tmp.h/;
52
53# the yytranslate[] table generated by bison is ASCII/EBCDIC sensitive
54
55die "$0: must be run on an ASCII system\n" unless ord 'A' == 65;
56
57# check for correct version number. The constraints are:
58# * must be >= 1.24 to avoid licensing issues.
59# * it must generate the yystos[] table. Version 1.28 doesn't generate
60# this; 1.35+ does
61# * Must produce output which is extractable by the regexes below
62# * Must produce the right values.
63# These last two contstraints may well be met by earlier versions, but
64# I simply haven't tested them yet. If it works for you, then modify
65# the test below to allow that version too. DAPM Feb 04.
66
67my $version = `$bison -V`;
20515881 68unless ($version =~ /\b(1\.875[a-z]?|2\.[01])\b/) { die <<EOF; }
0de566d7 69
2080282f 70You have the wrong version of bison in your path; currently 1.875
20515881
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712.0 or 2.1 is required. Try installing
72 http://ftp.gnu.org/gnu/bison/bison-2.1.tar.gz
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73or similar. Your bison identifies itself as:
74
75$version
76EOF
77
78# creates $tmpc_file and $tmph_file
79my_system("$bison -d -o $tmpc_file $y_file");
80
81open CTMPFILE, $tmpc_file or die "Can't open $tmpc_file: $!\n";
82my $clines;
83{ local $/; $clines = <CTMPFILE>; }
84die "failed to read $tmpc_file: length mismatch\n"
85 unless length $clines == -s $tmpc_file;
86close CTMPFILE;
87
88my ($actlines, $tablines) = extract($clines);
89
90chmod 0644, $act_file;
91open ACTFILE, ">$act_file" or die "can't open $act_file: $!\n";
92print ACTFILE $actlines;
93close ACTFILE;
94chmod 0444, $act_file;
95
96chmod 0644, $tab_file;
97open TABFILE, ">$tab_file" or die "can't open $tab_file: $!\n";
98print TABFILE $tablines;
99close TABFILE;
100chmod 0444, $tab_file;
101
102unlink $tmpc_file;
103
104# Wrap PERL_CORE round the symbol definitions. Also, the
105# C<#line 123 "perlytmp.h"> gets picked up by make depend, so change it.
106
107open TMPH_FILE, $tmph_file or die "Can't open $tmph_file: $!\n";
108chmod 0644, $h_file;
109open H_FILE, ">$h_file" or die "Can't open $h_file: $!\n";
110my $endcore_done = 0;
111while (<TMPH_FILE>) {
112 print H_FILE "#ifdef PERL_CORE\n" if $. == 1;
113 if (!$endcore_done and /YYSTYPE_IS_DECLARED/) {
114 print H_FILE "#endif /* PERL_CORE */\n";
115 $endcore_done = 1;
116 }
2ade6388 117 s/"$tmph_file"/"$h_file"/;
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118 print H_FILE $_;
119}
120close TMPH_FILE;
121close H_FILE;
122chmod 0444, $h_file;
123unlink $tmph_file;
124
125print "rebuilt: $h_file $tab_file $act_file\n";
126
127exit 0;
128
129
130sub extract {
131 my $clines = shift;
132 my $tablines;
133 my $actlines;
134
135 $clines =~ m@
136 (?:
137 ^/* YYFINAL[^\n]+\n #optional comment
138 )?
139 \# \s* define \s* YYFINAL # first #define
140 .*? # other defines + most tables
141 yystos\[\]\s*= # start of last table
142 .*?
143 }\s*; # end of last table
144 @xms
145 or die "Can't extract tables from $tmpc_file\n";
146 $tablines = $&;
147
148
149 $clines =~ m@
150 switch \s* \( \s* \w+ \s* \) \s* { \s*
151 (
152 case \s* \d+ \s* : \s*
2ade6388 153 \#line [^\n]+"\Q$y_file\E"
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154 .*?
155 )
156 }
157 \s*
158 ( \s* /\* .*? \*/ \s* )* # optional C-comments
159 \s*
160 (
161 \#line[^\n]+\.c"
162 |
163 \#line[^\n]+\.simple"
164 )
165 @xms
166 or die "Can't extract actions from $tmpc_file\n";
167 $actlines = $1;
168
169 return $actlines. "\n", $tablines. "\n";
170}
171
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172sub my_system {
173 system(@_);
174 if ($? == -1) {
175 die "failed to execute comamnd '@_': $!\n";
176 }
177 elsif ($? & 127) {
178 die sprintf "command '@_' died with signal %d\n",
179 ($? & 127);
180 }
181 elsif ($? >> 8) {
182 die sprintf "command '@_' exited with value %d\n", $? >> 8;
183 }
184}