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NNs and NULLOKs for MAD's new functions.
[perl5.git] / regen_madly.pl
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1#!/usr/bin/perl
2#
3# regen_madly.pl, DAPM 12-Feb-04
4#
5# Copyright (c) 2004, 2005 Larry Wall
6#
7# Given an input file madly.y, run bison on it and produce
8# the following output files:
9#
10# madly.h standard bison header file with minor doctoring of
11# #line directives plus adding a #ifdef PERL_CORE
12#
13# madly.tab the parser table C definitions extracted from the bison output
14#
15# madly.act the action case statements extracted from the bison output
16#
17# Note that madly.c is *not* regenerated - this is now a static file which
18# is not dependent on madly.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 madlytmp.h and madlytmp.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 || 'madly.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`;
68unless ($version =~ /\b(1\.875[a-z]?|2\.[01])\b/) { die <<EOF; }
69
70You have the wrong version of bison in your path; currently 1.875,
712.0 or 2.1 is required. Try installing
72 http://ftp.gnu.org/gnu/bison/bison-2.0.tar.gz
73or
74 http://ftp.gnu.org/gnu/bison/bison-1.875.tar.bz2
75or similar. Your bison identifies itself as:
76
77$version
78EOF
79
80# creates $tmpc_file and $tmph_file
81my_system("$bison -d -o $tmpc_file $y_file");
82
83open CTMPFILE, $tmpc_file or die "Can't open $tmpc_file: $!\n";
84my $clines;
85{ local $/; $clines = <CTMPFILE>; }
86die "failed to read $tmpc_file: length mismatch\n"
87 unless length $clines == -s $tmpc_file;
88close CTMPFILE;
89
90my ($actlines, $tablines) = extract($clines);
91
92chmod 0644, $act_file;
93open ACTFILE, ">$act_file" or die "can't open $act_file: $!\n";
94print ACTFILE $actlines;
95close ACTFILE;
96chmod 0444, $act_file;
97
98chmod 0644, $tab_file;
99open TABFILE, ">$tab_file" or die "can't open $tab_file: $!\n";
100print TABFILE $tablines;
101close TABFILE;
102chmod 0444, $tab_file;
103
104unlink $tmpc_file;
105
106# Wrap PERL_CORE round the symbol definitions. Also, the
107# C<#line 123 "madlytmp.h"> gets picked up by make depend, so change it.
108
109open TMPH_FILE, $tmph_file or die "Can't open $tmph_file: $!\n";
110chmod 0644, $h_file;
111open H_FILE, ">$h_file" or die "Can't open $h_file: $!\n";
112my $endcore_done = 0;
113while (<TMPH_FILE>) {
114 print H_FILE "#ifdef PERL_CORE\n" if $. == 1;
115 if (!$endcore_done and /YYSTYPE_IS_DECLARED/) {
116 print H_FILE "#endif /* PERL_CORE */\n";
117 $endcore_done = 1;
118 }
119 s/"madlytmp.h"/"madly.h"/;
120 print H_FILE $_;
121}
122close TMPH_FILE;
123close H_FILE;
124chmod 0444, $h_file;
125unlink $tmph_file;
126
127print "rebuilt: $h_file $tab_file $act_file\n";
128
129exit 0;
130
131
132sub extract {
133 my $clines = shift;
134 my $tablines;
135 my $actlines;
136
137 $clines =~ m@
138 (?:
139 ^/* YYFINAL[^\n]+\n #optional comment
140 )?
141 \# \s* define \s* YYFINAL # first #define
142 .*? # other defines + most tables
143 yystos\[\]\s*= # start of last table
144 .*?
145 }\s*; # end of last table
146 @xms
147 or die "Can't extract tables from $tmpc_file\n";
148 $tablines = $&;
149
150
151 $clines =~ m@
152 switch \s* \( \s* \w+ \s* \) \s* { \s*
153 (
154 case \s* \d+ \s* : \s*
155 \#line [^\n]+"madly\.y"
156 .*?
157 )
158 }
159 \s*
160 ( \s* /\* .*? \*/ \s* )* # optional C-comments
161 \s*
162 (
163 \#line[^\n]+\.c"
164 |
165 \#line[^\n]+\.simple"
166 )
167 @xms
168 or die "Can't extract actions from $tmpc_file\n";
169 $actlines = $1;
170
171 return $actlines. "\n", $tablines. "\n";
172}
173
174sub my_system {
175 system(@_);
176 if ($? == -1) {
177 die "failed to execute comamnd '@_': $!\n";
178 }
179 elsif ($? & 127) {
180 die sprintf "command '@_' died with signal %d\n",
181 ($? & 127);
182 }
183 elsif ($? >> 8) {
184 die sprintf "command '@_' exited with value %d\n", $? >> 8;
185 }
186}