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[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
0539ab63 14# plus an extra table generated by this script.
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15#
16# perly.act the action case statements extracted from the bison output
17#
18# Note that perly.c is *not* regenerated - this is now a static file which
19# is not dependent on perly.y any more.
20#
21# If a filename of the form foo.y is given on the command line, then
22# this is used instead as the basename for all the files mentioned
23# above.
24#
25# Note that temporary files of the form perlytmp.h and perlytmp.c are
26# created and then deleted during this process
27#
28# Note also that this script is intended to be run on a UNIX system;
29# it may work elsewhere but no specific attempt has been made to make it
30# portable.
31
32sub usage { die "usage: $0 [ -b bison_executable ] [ file.y ]\n" }
33
34use warnings;
35use strict;
36
37my $bison = 'bison';
38
39if (@ARGV >= 2 and $ARGV[0] eq '-b') {
40 shift;
41 $bison = shift;
42}
43
44my $y_file = shift || 'perly.y';
45
46usage unless @ARGV==0 && $y_file =~ /\.y$/;
47
48(my $h_file = $y_file) =~ s/\.y$/.h/;
49(my $act_file = $y_file) =~ s/\.y$/.act/;
50(my $tab_file = $y_file) =~ s/\.y$/.tab/;
51(my $tmpc_file = $y_file) =~ s/\.y$/tmp.c/;
52(my $tmph_file = $y_file) =~ s/\.y$/tmp.h/;
53
54# the yytranslate[] table generated by bison is ASCII/EBCDIC sensitive
55
56die "$0: must be run on an ASCII system\n" unless ord 'A' == 65;
57
58# check for correct version number. The constraints are:
59# * must be >= 1.24 to avoid licensing issues.
60# * it must generate the yystos[] table. Version 1.28 doesn't generate
61# this; 1.35+ does
62# * Must produce output which is extractable by the regexes below
63# * Must produce the right values.
64# These last two contstraints may well be met by earlier versions, but
65# I simply haven't tested them yet. If it works for you, then modify
66# the test below to allow that version too. DAPM Feb 04.
67
68my $version = `$bison -V`;
20515881 69unless ($version =~ /\b(1\.875[a-z]?|2\.[01])\b/) { die <<EOF; }
0de566d7 70
2080282f 71You have the wrong version of bison in your path; currently 1.875
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722.0 or 2.1 is required. Try installing
73 http://ftp.gnu.org/gnu/bison/bison-2.1.tar.gz
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74or similar. Your bison identifies itself as:
75
76$version
77EOF
78
79# creates $tmpc_file and $tmph_file
80my_system("$bison -d -o $tmpc_file $y_file");
81
82open CTMPFILE, $tmpc_file or die "Can't open $tmpc_file: $!\n";
83my $clines;
84{ local $/; $clines = <CTMPFILE>; }
85die "failed to read $tmpc_file: length mismatch\n"
86 unless length $clines == -s $tmpc_file;
87close CTMPFILE;
88
89my ($actlines, $tablines) = extract($clines);
90
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91$tablines .= make_opval_tab($y_file, $tablines);
92
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93chmod 0644, $act_file;
94open ACTFILE, ">$act_file" or die "can't open $act_file: $!\n";
95print ACTFILE $actlines;
96close ACTFILE;
97chmod 0444, $act_file;
98
99chmod 0644, $tab_file;
100open TABFILE, ">$tab_file" or die "can't open $tab_file: $!\n";
101print TABFILE $tablines;
102close TABFILE;
103chmod 0444, $tab_file;
104
105unlink $tmpc_file;
106
107# Wrap PERL_CORE round the symbol definitions. Also, the
108# C<#line 123 "perlytmp.h"> gets picked up by make depend, so change it.
109
110open TMPH_FILE, $tmph_file or die "Can't open $tmph_file: $!\n";
111chmod 0644, $h_file;
112open H_FILE, ">$h_file" or die "Can't open $h_file: $!\n";
113my $endcore_done = 0;
114while (<TMPH_FILE>) {
115 print H_FILE "#ifdef PERL_CORE\n" if $. == 1;
116 if (!$endcore_done and /YYSTYPE_IS_DECLARED/) {
117 print H_FILE "#endif /* PERL_CORE */\n";
118 $endcore_done = 1;
119 }
2ade6388 120 s/"$tmph_file"/"$h_file"/;
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121 print H_FILE $_;
122}
123close TMPH_FILE;
124close H_FILE;
125chmod 0444, $h_file;
126unlink $tmph_file;
127
128print "rebuilt: $h_file $tab_file $act_file\n";
129
130exit 0;
131
132
133sub extract {
134 my $clines = shift;
135 my $tablines;
136 my $actlines;
137
138 $clines =~ m@
139 (?:
140 ^/* YYFINAL[^\n]+\n #optional comment
141 )?
142 \# \s* define \s* YYFINAL # first #define
143 .*? # other defines + most tables
144 yystos\[\]\s*= # start of last table
145 .*?
146 }\s*; # end of last table
147 @xms
148 or die "Can't extract tables from $tmpc_file\n";
149 $tablines = $&;
150
151
152 $clines =~ m@
153 switch \s* \( \s* \w+ \s* \) \s* { \s*
154 (
155 case \s* \d+ \s* : \s*
2ade6388 156 \#line [^\n]+"\Q$y_file\E"
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157 .*?
158 )
159 }
160 \s*
161 ( \s* /\* .*? \*/ \s* )* # optional C-comments
162 \s*
163 (
164 \#line[^\n]+\.c"
165 |
166 \#line[^\n]+\.simple"
167 )
168 @xms
169 or die "Can't extract actions from $tmpc_file\n";
170 $actlines = $1;
171
172 return $actlines. "\n", $tablines. "\n";
173}
174
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175# read a .y file and extract a list of all the token names and
176# non-terminal names that are declared to be of type opval
177# then scan the string $tablines for the table yytname which gives
178# the token index of each token/non-terminal, then use this to
179# create a new table, indexed by token number, which indicates
180# whether that token is of type opval.
181#
182# ie given
183# %token <opval> A B
184# %type <opval> C D
185#
186# and yytname[] = { "A" "B", "C", "D", "E", "F" };
187#
188# then return
189# static const int yy_is_opval[] = { 1, 1, 1, 1, 0, 0 }
190
191sub make_opval_tab {
192 my ($y_file, $tablines) = @_;
193 my %tokens;
194 open my $fh, '<', $y_file or die "Can't open $y_file: $!\n";
195 while (<$fh>) {
196 next unless s/^%(token|type)\s+<opval>\s+//;
197 $tokens{$_} =1 for (split ' ', $_);
198 }
199
200 $tablines =~ /^\Qstatic const char *const yytname[] =\E\n
201 {\n
202 (.*?)
203 ^};
204 /xsm
205 or die "Can't extract yytname[] from table string\n";
206 my $fields = $1;
207 $fields =~ s/"([^"]+)"/$tokens{$1}||0/ge;
208 return
209 "/* which symbols are of type opval */\n" .
210 "static const int yy_is_opval[] =\n{\n" . $fields . "\n};\n";
211}
212
213
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214sub my_system {
215 system(@_);
216 if ($? == -1) {
217 die "failed to execute comamnd '@_': $!\n";
218 }
219 elsif ($? & 127) {
220 die sprintf "command '@_' died with signal %d\n",
221 ($? & 127);
222 }
223 elsif ($? >> 8) {
224 die sprintf "command '@_' exited with value %d\n", $? >> 8;
225 }
226}