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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#
2eee27d7 5# Copyright (c) 2004, 2005, 2006, 2009, 2010, 2011 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
e8fb9efb 32use 5.006;
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33sub usage { die "usage: $0 [ -b bison_executable ] [ file.y ]\n" }
34
35use warnings;
36use strict;
37
2bd4012d 38BEGIN { require 'regen/regen_lib.pl'; }
a9718e07 39
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40my $bison = 'bison';
41
42if (@ARGV >= 2 and $ARGV[0] eq '-b') {
43 shift;
44 $bison = shift;
45}
46
47my $y_file = shift || 'perly.y';
48
49usage unless @ARGV==0 && $y_file =~ /\.y$/;
50
51(my $h_file = $y_file) =~ s/\.y$/.h/;
52(my $act_file = $y_file) =~ s/\.y$/.act/;
53(my $tab_file = $y_file) =~ s/\.y$/.tab/;
54(my $tmpc_file = $y_file) =~ s/\.y$/tmp.c/;
55(my $tmph_file = $y_file) =~ s/\.y$/tmp.h/;
56
57# the yytranslate[] table generated by bison is ASCII/EBCDIC sensitive
58
59die "$0: must be run on an ASCII system\n" unless ord 'A' == 65;
60
61# check for correct version number. The constraints are:
62# * must be >= 1.24 to avoid licensing issues.
63# * it must generate the yystos[] table. Version 1.28 doesn't generate
64# this; 1.35+ does
65# * Must produce output which is extractable by the regexes below
66# * Must produce the right values.
8abc1060 67# These last two constraints may well be met by earlier versions, but
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68# I simply haven't tested them yet. If it works for you, then modify
69# the test below to allow that version too. DAPM Feb 04.
70
71my $version = `$bison -V`;
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72unless ($version) { die <<EOF; }
73Could not find a version of bison in your path. Please install bison.
74EOF
75
f5cf236d 76unless ($version =~ /\b(1\.875[a-z]?|2\.[0134567])\b/) { die <<EOF; }
0de566d7 77
2080282f 78You have the wrong version of bison in your path; currently 1.875
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792.0, 2.1, 2.3-2.7 is required. Try installing
80 http://ftp.gnu.org/gnu/bison/bison-2.7.tar.gz
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81or similar. Your bison identifies itself as:
82
83$version
84EOF
85
86# creates $tmpc_file and $tmph_file
87my_system("$bison -d -o $tmpc_file $y_file");
88
e8fb9efb 89open my $ctmp_fh, '<', $tmpc_file or die "Can't open $tmpc_file: $!\n";
0de566d7 90my $clines;
e8fb9efb 91{ local $/; $clines = <$ctmp_fh>; }
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92die "failed to read $tmpc_file: length mismatch\n"
93 unless length $clines == -s $tmpc_file;
e8fb9efb 94close $ctmp_fh;
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95
96my ($actlines, $tablines) = extract($clines);
97
6c7ae946 98our %tokens;
d5c6462e 99$tablines .= make_type_tab($y_file, $tablines);
0539ab63 100
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101my ($act_fh, $tab_fh, $h_fh) = map {
102 open_new($_, '>', { by => $0, from => $y_file });
103} $act_file, $tab_file, $h_file;
0de566d7 104
cc49830d 105print $act_fh $actlines;
e8fb9efb 106
cc49830d 107print $tab_fh $tablines;
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108
109unlink $tmpc_file;
110
111# Wrap PERL_CORE round the symbol definitions. Also, the
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112# C<#line 30 "perly.y"> confuses the Win32 resource compiler and the
113# C<#line 188 "perlytmp.h"> gets picked up by make depend, so remove them.
0de566d7 114
e8fb9efb 115open my $tmph_fh, '<', $tmph_file or die "Can't open $tmph_file: $!\n";
e8fb9efb 116
0de566d7 117my $endcore_done = 0;
2434f628 118# Token macros need to be generated manually from bison 2.4 on
04ff073f 119my $gather_tokens = ($version =~ /\b2\.[456]\b/ ? undef : 0);
ce1534ab 120my $tokens;
e8fb9efb 121while (<$tmph_fh>) {
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122 # bison 2.6 adds header guards, which break things because of where we
123 # insert #ifdef PERL_CORE, so strip them because they aren't important
124 next if /YY_PERLYTMP_H/;
125
e8fb9efb 126 print $h_fh "#ifdef PERL_CORE\n" if $. == 1;
0de566d7 127 if (!$endcore_done and /YYSTYPE_IS_DECLARED/) {
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128 print $h_fh <<h;
129#ifdef PERL_IN_TOKE_C
130static bool
131S_is_opval_token(int type) {
132 switch (type) {
133h
134 print $h_fh <<i for sort grep $tokens{$_} eq 'opval', keys %tokens;
135 case $_:
136i
137 print $h_fh <<j;
138 return 1;
139 }
140 return 0;
141}
142#endif /* PERL_IN_TOKE_C */
143#endif /* PERL_CORE */
144j
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145 $endcore_done = 1;
146 }
96f4e226 147 next if /^#line \d+ ".*"/;
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148 if (not defined $gather_tokens) {
149 $gather_tokens = 1 if /^\s* enum \s* yytokentype \s* \{/x;
150 }
151 elsif ($gather_tokens) {
152 if (/^\# \s* endif/x) { # The #endif just after the end of the token enum
153 $gather_tokens = 0;
154 $_ .= "\n/* Tokens. */\n$tokens";
155 }
156 else {
157 my ($tok, $val) = /(\w+) \s* = \s* (\d+)/x;
158 $tokens .= "#define $tok $val\n" if $tok;
159 }
160 }
e8fb9efb 161 print $h_fh $_;
0de566d7 162}
e8fb9efb 163close $tmph_fh;
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164unlink $tmph_file;
165
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166foreach ($act_fh, $tab_fh, $h_fh) {
167 read_only_bottom_close_and_rename($_, ['regen_perly.pl', $y_file]);
168}
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169
170exit 0;
171
172
173sub extract {
174 my $clines = shift;
175 my $tablines;
176 my $actlines;
177
178 $clines =~ m@
179 (?:
180 ^/* YYFINAL[^\n]+\n #optional comment
181 )?
182 \# \s* define \s* YYFINAL # first #define
183 .*? # other defines + most tables
184 yystos\[\]\s*= # start of last table
185 .*?
186 }\s*; # end of last table
187 @xms
188 or die "Can't extract tables from $tmpc_file\n";
189 $tablines = $&;
190
191
192 $clines =~ m@
193 switch \s* \( \s* \w+ \s* \) \s* { \s*
194 (
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195 case \s* \d+ \s* :
196 \s*
197 (?: \s* /\* .*? \*/ \s* )* # optional C-comments
198 \s*
2ade6388 199 \#line [^\n]+"\Q$y_file\E"
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200 .*?
201 )
202 }
203 \s*
ce1534ab 204 (?: \s* /\* .*? \*/ \s* )* # optional C-comments
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205 \s*
206 (
207 \#line[^\n]+\.c"
208 |
209 \#line[^\n]+\.simple"
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210 |
211 YY_SYMBOL_PRINT
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212 )
213 @xms
214 or die "Can't extract actions from $tmpc_file\n";
215 $actlines = $1;
216
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217 # Remove extraneous comments from bison 2.4
218 $actlines =~ s!\s* /\* \s* Line \s* \d+ \s* of \s* yacc\.c \s* \*/!!gx;
219
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220 # C<#line 188 "perlytmp.c"> gets picked up by make depend, so remove them.
221 $actlines =~ s/^#line \d+ "\Q$tmpc_file\E".*$//gm;
222
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223 # convert yyvsp[nnn] into ps[nnn].val
224
225 $actlines =~ s/yyvsp\[(.*?)\]/ps[$1].val/g
226 or die "Can't convert value stack name\n";
227
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228 return $actlines. "\n", $tablines. "\n";
229}
230
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231# Generate a table, yy_type_tab[], that specifies for each token, what
232# type of value it holds.
0539ab63 233#
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234# Read the .y file and extract a list of all the token names and
235# non-terminal names; then scan the string $tablines for the table yytname,
236# which gives the token index of each token/non-terminal; then use this to
237# create yy_type_tab.
0539ab63 238#
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239# ie given (in perly.y),
240#
241# %token <opval> A
242# %token <ival> B
243# %type <pval> C
244# %type <opval> D
245#
246# and (in $tablines),
247#
248# yytname[] = { "A" "B", "C", "D", "E" };
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249#
250# then return
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251#
252# typedef enum { toketype_ival, toketype_opval, toketype_pval } toketypes;
253#
254# static const toketypes yy_type_tab[]
255# = { toketype_opval, toketype_ival, toketype_pval,
256# toketype_opval, toketype_ival }
257#
258# where "E" has the default type. The default type is determined
259# by the __DEFAULT__ comment next to the appropriate union member in
260# perly.y
0539ab63 261
d5c6462e 262sub make_type_tab {
0539ab63 263 my ($y_file, $tablines) = @_;
6c7ae946 264 my %just_tokens;
0539ab63 265 my %tokens;
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266 my %types;
267 my $default_token;
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268 open my $fh, '<', $y_file or die "Can't open $y_file: $!\n";
269 while (<$fh>) {
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270 if (/(\$\d+)\s*=/) {
271 warn "$y_file:$.: dangerous assignment to $1: $_";
272 }
273
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274 if (/__DEFAULT__/) {
275 m{(\w+) \s* ; \s* /\* \s* __DEFAULT__}x
276 or die "$y_file: can't parse __DEFAULT__ line: $_";
277 die "$y_file: duplicate __DEFAULT__ line: $_"
278 if defined $default_token;
279 $default_token = $1;
280 next;
281 }
282
283 next unless /^%(token|type)/;
6c7ae946 284 s/^%((token)|type)\s+<(\w+)>\s+//
d5c6462e 285 or die "$y_file: unparseable token/type line: $_";
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286 for (split ' ', $_) {
287 $tokens{$_} = $3;
288 if ($2) {
289 $just_tokens{$_} = $3;
290 }
291 }
292 $types{$3} = 1;
0539ab63 293 }
6c7ae946 294 *tokens = \%just_tokens; # perly.h needs this
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295 die "$y_file: no __DEFAULT__ token defined\n" unless $default_token;
296 $types{$default_token} = 1;
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297
298 $tablines =~ /^\Qstatic const char *const yytname[] =\E\n
efcfdf1f 299 \{\n
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300 (.*?)
301 ^};
302 /xsm
303 or die "Can't extract yytname[] from table string\n";
304 my $fields = $1;
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305 $fields =~ s{"([^"]+)"}
306 { "toketype_" .
307 (defined $tokens{$1} ? $tokens{$1} : $default_token)
308 }ge;
04ff073f 309 $fields =~ s/, \s* (?:0|YY_NULL) \s* $//x
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310 or die "make_type_tab: couldn't delete trailing ',0'\n";
311
0539ab63 312 return
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313 "\ntypedef enum {\n\t"
314 . join(", ", map "toketype_$_", sort keys %types)
315 . "\n} toketypes;\n\n"
316 . "/* type of each token/terminal */\n"
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317 . "static const toketypes yy_type_tab[] =\n{\n"
318 . $fields
319 . "\n};\n";
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320}
321
322
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323sub my_system {
324 system(@_);
325 if ($? == -1) {
d5c6462e 326 die "failed to execute command '@_': $!\n";
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327 }
328 elsif ($? & 127) {
329 die sprintf "command '@_' died with signal %d\n",
330 ($? & 127);
331 }
332 elsif ($? >> 8) {
333 die sprintf "command '@_' exited with value %d\n", $? >> 8;
334 }
335}