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0de566d7 DM |
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 |
0de566d7 DM |
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. |
0de566d7 DM |
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 | 32 | use 5.006; |
0de566d7 DM |
33 | sub usage { die "usage: $0 [ -b bison_executable ] [ file.y ]\n" } |
34 | ||
35 | use warnings; | |
36 | use strict; | |
37 | ||
e64a0c47 | 38 | our $Verbose; |
3d7c117d | 39 | BEGIN { require './regen/regen_lib.pl'; } |
a9718e07 | 40 | |
0de566d7 DM |
41 | my $bison = 'bison'; |
42 | ||
43 | if (@ARGV >= 2 and $ARGV[0] eq '-b') { | |
44 | shift; | |
45 | $bison = shift; | |
46 | } | |
47 | ||
48 | my $y_file = shift || 'perly.y'; | |
49 | ||
50 | usage unless @ARGV==0 && $y_file =~ /\.y$/; | |
51 | ||
52 | (my $h_file = $y_file) =~ s/\.y$/.h/; | |
53 | (my $act_file = $y_file) =~ s/\.y$/.act/; | |
54 | (my $tab_file = $y_file) =~ s/\.y$/.tab/; | |
55 | (my $tmpc_file = $y_file) =~ s/\.y$/tmp.c/; | |
56 | (my $tmph_file = $y_file) =~ s/\.y$/tmp.h/; | |
57 | ||
58 | # the yytranslate[] table generated by bison is ASCII/EBCDIC sensitive | |
59 | ||
60 | die "$0: must be run on an ASCII system\n" unless ord 'A' == 65; | |
61 | ||
62 | # check for correct version number. The constraints are: | |
63 | # * must be >= 1.24 to avoid licensing issues. | |
64 | # * it must generate the yystos[] table. Version 1.28 doesn't generate | |
65 | # this; 1.35+ does | |
66 | # * Must produce output which is extractable by the regexes below | |
67 | # * Must produce the right values. | |
8abc1060 | 68 | # These last two constraints may well be met by earlier versions, but |
0de566d7 DM |
69 | # I simply haven't tested them yet. If it works for you, then modify |
70 | # the test below to allow that version too. DAPM Feb 04. | |
71 | ||
72 | my $version = `$bison -V`; | |
7b931d50 LB |
73 | unless ($version) { die <<EOF; } |
74 | Could not find a version of bison in your path. Please install bison. | |
75 | EOF | |
76 | ||
9c221ee4 NC |
77 | # Don't change this to add new bison versions without testing that the generated |
78 | # files actually work :-) Win32 in particular may not like them. :-( | |
86b50d93 | 79 | unless ($version =~ /\b(1\.875[a-z]?|2\.[0134567]|3\.[0-4])\b/) { die <<EOF; } |
0de566d7 | 80 | |
f39ff1f3 | 81 | You have the wrong version of bison in your path; currently versions |
86b50d93 | 82 | 1.875, 2.0-2.7 or 3.0-3.4 are known to work. Try installing |
9c221ee4 | 83 | http://ftp.gnu.org/gnu/bison/bison-2.5.1.tar.gz |
0de566d7 DM |
84 | or similar. Your bison identifies itself as: |
85 | ||
86 | $version | |
87 | EOF | |
88 | ||
9c221ee4 NC |
89 | # bison's version number, not the entire string, is most useful later on. |
90 | $version = $1; | |
91 | ||
0de566d7 DM |
92 | # creates $tmpc_file and $tmph_file |
93 | my_system("$bison -d -o $tmpc_file $y_file"); | |
94 | ||
e8fb9efb | 95 | open my $ctmp_fh, '<', $tmpc_file or die "Can't open $tmpc_file: $!\n"; |
0de566d7 | 96 | my $clines; |
e8fb9efb | 97 | { local $/; $clines = <$ctmp_fh>; } |
0de566d7 DM |
98 | die "failed to read $tmpc_file: length mismatch\n" |
99 | unless length $clines == -s $tmpc_file; | |
e8fb9efb | 100 | close $ctmp_fh; |
0de566d7 DM |
101 | |
102 | my ($actlines, $tablines) = extract($clines); | |
103 | ||
6c7ae946 | 104 | our %tokens; |
d5c6462e | 105 | $tablines .= make_type_tab($y_file, $tablines); |
0539ab63 | 106 | |
cc49830d NC |
107 | my ($act_fh, $tab_fh, $h_fh) = map { |
108 | open_new($_, '>', { by => $0, from => $y_file }); | |
109 | } $act_file, $tab_file, $h_file; | |
0de566d7 | 110 | |
cc49830d | 111 | print $act_fh $actlines; |
e8fb9efb | 112 | |
cc49830d | 113 | print $tab_fh $tablines; |
0de566d7 DM |
114 | |
115 | unlink $tmpc_file; | |
116 | ||
117 | # Wrap PERL_CORE round the symbol definitions. Also, the | |
96f4e226 SH |
118 | # C<#line 30 "perly.y"> confuses the Win32 resource compiler and the |
119 | # C<#line 188 "perlytmp.h"> gets picked up by make depend, so remove them. | |
0de566d7 | 120 | |
e8fb9efb | 121 | open my $tmph_fh, '<', $tmph_file or die "Can't open $tmph_file: $!\n"; |
e8fb9efb | 122 | |
f39ff1f3 DM |
123 | # add integer-encoded #def of the bison version |
124 | ||
125 | { | |
126 | $version =~ /^(\d+)\.(\d+)/ | |
127 | or die "Can't handle bison version format: '$version'"; | |
128 | my ($v1,$v2) = ($1,$2); | |
129 | die "Unexpectedly large bison version '$v1'" if $v1 > 99; | |
130 | die "Unexpectedly large bison subversion '$v2'" if $v2 > 9999; | |
131 | ||
132 | printf $h_fh "#define PERL_BISON_VERSION %2d%04d\n\n", $v1, $v2; | |
133 | } | |
134 | ||
0de566d7 | 135 | my $endcore_done = 0; |
2434f628 | 136 | # Token macros need to be generated manually from bison 2.4 on |
9c221ee4 | 137 | my $gather_tokens = $version >= 2.4 ? undef : 0; |
ce1534ab | 138 | my $tokens; |
e8fb9efb | 139 | while (<$tmph_fh>) { |
04ff073f JL |
140 | # bison 2.6 adds header guards, which break things because of where we |
141 | # insert #ifdef PERL_CORE, so strip them because they aren't important | |
142 | next if /YY_PERLYTMP_H/; | |
143 | ||
e8fb9efb | 144 | print $h_fh "#ifdef PERL_CORE\n" if $. == 1; |
0de566d7 | 145 | if (!$endcore_done and /YYSTYPE_IS_DECLARED/) { |
6c7ae946 FC |
146 | print $h_fh <<h; |
147 | #ifdef PERL_IN_TOKE_C | |
148 | static bool | |
149 | S_is_opval_token(int type) { | |
150 | switch (type) { | |
151 | h | |
152 | print $h_fh <<i for sort grep $tokens{$_} eq 'opval', keys %tokens; | |
153 | case $_: | |
154 | i | |
155 | print $h_fh <<j; | |
156 | return 1; | |
157 | } | |
158 | return 0; | |
159 | } | |
160 | #endif /* PERL_IN_TOKE_C */ | |
161 | #endif /* PERL_CORE */ | |
162 | j | |
0de566d7 DM |
163 | $endcore_done = 1; |
164 | } | |
96f4e226 | 165 | next if /^#line \d+ ".*"/; |
ce1534ab VP |
166 | if (not defined $gather_tokens) { |
167 | $gather_tokens = 1 if /^\s* enum \s* yytokentype \s* \{/x; | |
168 | } | |
169 | elsif ($gather_tokens) { | |
170 | if (/^\# \s* endif/x) { # The #endif just after the end of the token enum | |
171 | $gather_tokens = 0; | |
172 | $_ .= "\n/* Tokens. */\n$tokens"; | |
173 | } | |
174 | else { | |
175 | my ($tok, $val) = /(\w+) \s* = \s* (\d+)/x; | |
176 | $tokens .= "#define $tok $val\n" if $tok; | |
177 | } | |
178 | } | |
e8fb9efb | 179 | print $h_fh $_; |
0de566d7 | 180 | } |
e8fb9efb | 181 | close $tmph_fh; |
0de566d7 DM |
182 | unlink $tmph_file; |
183 | ||
c24c946d NC |
184 | foreach ($act_fh, $tab_fh, $h_fh) { |
185 | read_only_bottom_close_and_rename($_, ['regen_perly.pl', $y_file]); | |
186 | } | |
0de566d7 DM |
187 | |
188 | exit 0; | |
189 | ||
190 | ||
59966791 DM |
191 | # extract the tables and actions from the generated .c file |
192 | ||
0de566d7 DM |
193 | sub extract { |
194 | my $clines = shift; | |
195 | my $tablines; | |
196 | my $actlines; | |
197 | ||
f39ff1f3 | 198 | my $last_table = $version >= 3 ? 'yyr2' : 'yystos'; |
0de566d7 DM |
199 | $clines =~ m@ |
200 | (?: | |
201 | ^/* YYFINAL[^\n]+\n #optional comment | |
202 | )? | |
203 | \# \s* define \s* YYFINAL # first #define | |
204 | .*? # other defines + most tables | |
f39ff1f3 | 205 | $last_table\[\]\s*= # start of last table |
0de566d7 DM |
206 | .*? |
207 | }\s*; # end of last table | |
208 | @xms | |
209 | or die "Can't extract tables from $tmpc_file\n"; | |
210 | $tablines = $&; | |
211 | ||
212 | ||
59966791 DM |
213 | # extract all the cases in the big action switch statement |
214 | ||
0de566d7 | 215 | $clines =~ m@ |
59966791 DM |
216 | switch \s* \( \s* yyn \s* \) \s* { \s* |
217 | ( .*? default: \s* break; \s* ) | |
218 | } | |
0de566d7 DM |
219 | @xms |
220 | or die "Can't extract actions from $tmpc_file\n"; | |
221 | $actlines = $1; | |
222 | ||
ce1534ab VP |
223 | # Remove extraneous comments from bison 2.4 |
224 | $actlines =~ s!\s* /\* \s* Line \s* \d+ \s* of \s* yacc\.c \s* \*/!!gx; | |
225 | ||
0d6f9730 DM |
226 | # C<#line 188 "perlytmp.c"> gets picked up by make depend, so remove them. |
227 | $actlines =~ s/^#line \d+ "\Q$tmpc_file\E".*$//gm; | |
228 | ||
1654d593 DM |
229 | # convert yyvsp[nnn] into ps[nnn].val |
230 | ||
231 | $actlines =~ s/yyvsp\[(.*?)\]/ps[$1].val/g | |
232 | or die "Can't convert value stack name\n"; | |
233 | ||
0de566d7 DM |
234 | return $actlines. "\n", $tablines. "\n"; |
235 | } | |
236 | ||
d5c6462e DM |
237 | # Generate a table, yy_type_tab[], that specifies for each token, what |
238 | # type of value it holds. | |
0539ab63 | 239 | # |
d5c6462e DM |
240 | # Read the .y file and extract a list of all the token names and |
241 | # non-terminal names; then scan the string $tablines for the table yytname, | |
242 | # which gives the token index of each token/non-terminal; then use this to | |
243 | # create yy_type_tab. | |
0539ab63 | 244 | # |
d5c6462e DM |
245 | # ie given (in perly.y), |
246 | # | |
247 | # %token <opval> A | |
248 | # %token <ival> B | |
249 | # %type <pval> C | |
250 | # %type <opval> D | |
251 | # | |
252 | # and (in $tablines), | |
253 | # | |
254 | # yytname[] = { "A" "B", "C", "D", "E" }; | |
0539ab63 DM |
255 | # |
256 | # then return | |
d5c6462e DM |
257 | # |
258 | # typedef enum { toketype_ival, toketype_opval, toketype_pval } toketypes; | |
259 | # | |
260 | # static const toketypes yy_type_tab[] | |
261 | # = { toketype_opval, toketype_ival, toketype_pval, | |
262 | # toketype_opval, toketype_ival } | |
263 | # | |
264 | # where "E" has the default type. The default type is determined | |
265 | # by the __DEFAULT__ comment next to the appropriate union member in | |
266 | # perly.y | |
0539ab63 | 267 | |
d5c6462e | 268 | sub make_type_tab { |
0539ab63 | 269 | my ($y_file, $tablines) = @_; |
6c7ae946 | 270 | my %just_tokens; |
0539ab63 | 271 | my %tokens; |
d5c6462e DM |
272 | my %types; |
273 | my $default_token; | |
0539ab63 DM |
274 | open my $fh, '<', $y_file or die "Can't open $y_file: $!\n"; |
275 | while (<$fh>) { | |
b5bbe64a | 276 | if (/(\$\d+)\s*=[^=]/) { |
29522234 DM |
277 | warn "$y_file:$.: dangerous assignment to $1: $_"; |
278 | } | |
279 | ||
d5c6462e DM |
280 | if (/__DEFAULT__/) { |
281 | m{(\w+) \s* ; \s* /\* \s* __DEFAULT__}x | |
282 | or die "$y_file: can't parse __DEFAULT__ line: $_"; | |
283 | die "$y_file: duplicate __DEFAULT__ line: $_" | |
284 | if defined $default_token; | |
285 | $default_token = $1; | |
286 | next; | |
287 | } | |
288 | ||
289 | next unless /^%(token|type)/; | |
6c7ae946 | 290 | s/^%((token)|type)\s+<(\w+)>\s+// |
d5c6462e | 291 | or die "$y_file: unparseable token/type line: $_"; |
6c7ae946 FC |
292 | for (split ' ', $_) { |
293 | $tokens{$_} = $3; | |
294 | if ($2) { | |
295 | $just_tokens{$_} = $3; | |
296 | } | |
297 | } | |
298 | $types{$3} = 1; | |
0539ab63 | 299 | } |
6c7ae946 | 300 | *tokens = \%just_tokens; # perly.h needs this |
d5c6462e DM |
301 | die "$y_file: no __DEFAULT__ token defined\n" unless $default_token; |
302 | $types{$default_token} = 1; | |
0539ab63 DM |
303 | |
304 | $tablines =~ /^\Qstatic const char *const yytname[] =\E\n | |
efcfdf1f | 305 | \{\n |
0539ab63 DM |
306 | (.*?) |
307 | ^}; | |
308 | /xsm | |
309 | or die "Can't extract yytname[] from table string\n"; | |
310 | my $fields = $1; | |
d5c6462e DM |
311 | $fields =~ s{"([^"]+)"} |
312 | { "toketype_" . | |
313 | (defined $tokens{$1} ? $tokens{$1} : $default_token) | |
314 | }ge; | |
f39ff1f3 | 315 | $fields =~ s/, \s* (?:0|YY_NULL|YY_NULLPTR) \s* $//x |
d5c6462e DM |
316 | or die "make_type_tab: couldn't delete trailing ',0'\n"; |
317 | ||
0539ab63 | 318 | return |
d5c6462e DM |
319 | "\ntypedef enum {\n\t" |
320 | . join(", ", map "toketype_$_", sort keys %types) | |
321 | . "\n} toketypes;\n\n" | |
322 | . "/* type of each token/terminal */\n" | |
d5c6462e DM |
323 | . "static const toketypes yy_type_tab[] =\n{\n" |
324 | . $fields | |
325 | . "\n};\n"; | |
0539ab63 DM |
326 | } |
327 | ||
328 | ||
0de566d7 | 329 | sub my_system { |
95a1c520 DM |
330 | if ($Verbose) { |
331 | print "executing: @_\n"; | |
332 | } | |
0de566d7 DM |
333 | system(@_); |
334 | if ($? == -1) { | |
d5c6462e | 335 | die "failed to execute command '@_': $!\n"; |
0de566d7 DM |
336 | } |
337 | elsif ($? & 127) { | |
338 | die sprintf "command '@_' died with signal %d\n", | |
339 | ($? & 127); | |
340 | } | |
341 | elsif ($? >> 8) { | |
342 | die sprintf "command '@_' exited with value %d\n", $? >> 8; | |
343 | } | |
344 | } |