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0de566d7 DM |
1 | #!/usr/bin/perl |
2 | # | |
3 | # regen_perly.pl, DAPM 12-Feb-04 | |
4 | # | |
1d325971 | 5 | # Copyright (c) 2004, 2005 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 | ||
32 | sub usage { die "usage: $0 [ -b bison_executable ] [ file.y ]\n" } | |
33 | ||
34 | use warnings; | |
35 | use strict; | |
36 | ||
2bd4012d | 37 | BEGIN { require 'regen/regen_lib.pl'; } |
a9718e07 | 38 | |
0de566d7 DM |
39 | my $bison = 'bison'; |
40 | ||
41 | if (@ARGV >= 2 and $ARGV[0] eq '-b') { | |
42 | shift; | |
43 | $bison = shift; | |
44 | } | |
45 | ||
46 | my $y_file = shift || 'perly.y'; | |
47 | ||
48 | usage unless @ARGV==0 && $y_file =~ /\.y$/; | |
49 | ||
50 | (my $h_file = $y_file) =~ s/\.y$/.h/; | |
51 | (my $act_file = $y_file) =~ s/\.y$/.act/; | |
52 | (my $tab_file = $y_file) =~ s/\.y$/.tab/; | |
53 | (my $tmpc_file = $y_file) =~ s/\.y$/tmp.c/; | |
54 | (my $tmph_file = $y_file) =~ s/\.y$/tmp.h/; | |
a9718e07 Z |
55 | my $new_h_file = "$h_file-new"; |
56 | my $new_act_file = "$act_file-new"; | |
57 | my $new_tab_file = "$tab_file-new"; | |
0de566d7 DM |
58 | |
59 | # the yytranslate[] table generated by bison is ASCII/EBCDIC sensitive | |
60 | ||
61 | die "$0: must be run on an ASCII system\n" unless ord 'A' == 65; | |
62 | ||
63 | # check for correct version number. The constraints are: | |
64 | # * must be >= 1.24 to avoid licensing issues. | |
65 | # * it must generate the yystos[] table. Version 1.28 doesn't generate | |
66 | # this; 1.35+ does | |
67 | # * Must produce output which is extractable by the regexes below | |
68 | # * Must produce the right values. | |
69 | # These last two contstraints may well be met by earlier versions, but | |
70 | # I simply haven't tested them yet. If it works for you, then modify | |
71 | # the test below to allow that version too. DAPM Feb 04. | |
72 | ||
73 | my $version = `$bison -V`; | |
7b931d50 LB |
74 | unless ($version) { die <<EOF; } |
75 | Could not find a version of bison in your path. Please install bison. | |
76 | EOF | |
77 | ||
ce1534ab | 78 | unless ($version =~ /\b(1\.875[a-z]?|2\.[0134])\b/) { die <<EOF; } |
0de566d7 | 79 | |
2080282f | 80 | You have the wrong version of bison in your path; currently 1.875 |
aae7e7b3 VP |
81 | 2.0, 2.1, 2.3 or 2.4 is required. Try installing |
82 | http://ftp.gnu.org/gnu/bison/bison-2.4.1.tar.gz | |
0de566d7 DM |
83 | or similar. Your bison identifies itself as: |
84 | ||
85 | $version | |
86 | EOF | |
87 | ||
88 | # creates $tmpc_file and $tmph_file | |
89 | my_system("$bison -d -o $tmpc_file $y_file"); | |
90 | ||
91 | open CTMPFILE, $tmpc_file or die "Can't open $tmpc_file: $!\n"; | |
92 | my $clines; | |
93 | { local $/; $clines = <CTMPFILE>; } | |
94 | die "failed to read $tmpc_file: length mismatch\n" | |
95 | unless length $clines == -s $tmpc_file; | |
96 | close CTMPFILE; | |
97 | ||
98 | my ($actlines, $tablines) = extract($clines); | |
99 | ||
d5c6462e | 100 | $tablines .= make_type_tab($y_file, $tablines); |
0539ab63 | 101 | |
a9718e07 Z |
102 | chmod 0644, $new_act_file; |
103 | open ACTFILE, ">$new_act_file" or die "can't open $new_act_file: $!\n"; | |
0de566d7 DM |
104 | print ACTFILE $actlines; |
105 | close ACTFILE; | |
a9718e07 | 106 | chmod 0444, $new_act_file; |
0de566d7 | 107 | |
a9718e07 Z |
108 | chmod 0644, $new_tab_file; |
109 | open TABFILE, ">$new_tab_file" or die "can't open $new_tab_file: $!\n"; | |
0de566d7 DM |
110 | print TABFILE $tablines; |
111 | close TABFILE; | |
a9718e07 | 112 | chmod 0444, $new_tab_file; |
0de566d7 DM |
113 | |
114 | unlink $tmpc_file; | |
115 | ||
116 | # Wrap PERL_CORE round the symbol definitions. Also, the | |
96f4e226 SH |
117 | # C<#line 30 "perly.y"> confuses the Win32 resource compiler and the |
118 | # C<#line 188 "perlytmp.h"> gets picked up by make depend, so remove them. | |
0de566d7 DM |
119 | |
120 | open TMPH_FILE, $tmph_file or die "Can't open $tmph_file: $!\n"; | |
a9718e07 Z |
121 | chmod 0644, $new_h_file; |
122 | open H_FILE, ">$new_h_file" or die "Can't open $new_h_file: $!\n"; | |
0de566d7 | 123 | my $endcore_done = 0; |
ce1534ab VP |
124 | # Token macros need to be generated manually on bison 2.4 |
125 | my $gather_tokens = ($version =~ /\b2\.4\b/ ? undef : 0); | |
126 | my $tokens; | |
0de566d7 DM |
127 | while (<TMPH_FILE>) { |
128 | print H_FILE "#ifdef PERL_CORE\n" if $. == 1; | |
129 | if (!$endcore_done and /YYSTYPE_IS_DECLARED/) { | |
130 | print H_FILE "#endif /* PERL_CORE */\n"; | |
131 | $endcore_done = 1; | |
132 | } | |
96f4e226 | 133 | next if /^#line \d+ ".*"/; |
ce1534ab VP |
134 | if (not defined $gather_tokens) { |
135 | $gather_tokens = 1 if /^\s* enum \s* yytokentype \s* \{/x; | |
136 | } | |
137 | elsif ($gather_tokens) { | |
138 | if (/^\# \s* endif/x) { # The #endif just after the end of the token enum | |
139 | $gather_tokens = 0; | |
140 | $_ .= "\n/* Tokens. */\n$tokens"; | |
141 | } | |
142 | else { | |
143 | my ($tok, $val) = /(\w+) \s* = \s* (\d+)/x; | |
144 | $tokens .= "#define $tok $val\n" if $tok; | |
145 | } | |
146 | } | |
0de566d7 DM |
147 | print H_FILE $_; |
148 | } | |
149 | close TMPH_FILE; | |
150 | close H_FILE; | |
a9718e07 | 151 | chmod 0444, $new_h_file; |
0de566d7 DM |
152 | unlink $tmph_file; |
153 | ||
a9718e07 Z |
154 | rename_if_different($new_h_file, $h_file); |
155 | rename_if_different($new_tab_file, $tab_file); | |
156 | rename_if_different($new_act_file, $act_file); | |
0de566d7 DM |
157 | |
158 | exit 0; | |
159 | ||
160 | ||
161 | sub extract { | |
162 | my $clines = shift; | |
163 | my $tablines; | |
164 | my $actlines; | |
165 | ||
166 | $clines =~ m@ | |
167 | (?: | |
168 | ^/* YYFINAL[^\n]+\n #optional comment | |
169 | )? | |
170 | \# \s* define \s* YYFINAL # first #define | |
171 | .*? # other defines + most tables | |
172 | yystos\[\]\s*= # start of last table | |
173 | .*? | |
174 | }\s*; # end of last table | |
175 | @xms | |
176 | or die "Can't extract tables from $tmpc_file\n"; | |
177 | $tablines = $&; | |
178 | ||
179 | ||
180 | $clines =~ m@ | |
181 | switch \s* \( \s* \w+ \s* \) \s* { \s* | |
182 | ( | |
ce1534ab VP |
183 | case \s* \d+ \s* : |
184 | \s* | |
185 | (?: \s* /\* .*? \*/ \s* )* # optional C-comments | |
186 | \s* | |
2ade6388 | 187 | \#line [^\n]+"\Q$y_file\E" |
0de566d7 DM |
188 | .*? |
189 | ) | |
190 | } | |
191 | \s* | |
ce1534ab | 192 | (?: \s* /\* .*? \*/ \s* )* # optional C-comments |
0de566d7 DM |
193 | \s* |
194 | ( | |
195 | \#line[^\n]+\.c" | |
196 | | | |
197 | \#line[^\n]+\.simple" | |
3797f23d DM |
198 | | |
199 | YY_SYMBOL_PRINT | |
0de566d7 DM |
200 | ) |
201 | @xms | |
202 | or die "Can't extract actions from $tmpc_file\n"; | |
203 | $actlines = $1; | |
204 | ||
ce1534ab VP |
205 | # Remove extraneous comments from bison 2.4 |
206 | $actlines =~ s!\s* /\* \s* Line \s* \d+ \s* of \s* yacc\.c \s* \*/!!gx; | |
207 | ||
0d6f9730 DM |
208 | # C<#line 188 "perlytmp.c"> gets picked up by make depend, so remove them. |
209 | $actlines =~ s/^#line \d+ "\Q$tmpc_file\E".*$//gm; | |
210 | ||
1654d593 DM |
211 | # convert yyvsp[nnn] into ps[nnn].val |
212 | ||
213 | $actlines =~ s/yyvsp\[(.*?)\]/ps[$1].val/g | |
214 | or die "Can't convert value stack name\n"; | |
215 | ||
0de566d7 DM |
216 | return $actlines. "\n", $tablines. "\n"; |
217 | } | |
218 | ||
d5c6462e DM |
219 | # Generate a table, yy_type_tab[], that specifies for each token, what |
220 | # type of value it holds. | |
0539ab63 | 221 | # |
d5c6462e DM |
222 | # Read the .y file and extract a list of all the token names and |
223 | # non-terminal names; then scan the string $tablines for the table yytname, | |
224 | # which gives the token index of each token/non-terminal; then use this to | |
225 | # create yy_type_tab. | |
0539ab63 | 226 | # |
d5c6462e DM |
227 | # ie given (in perly.y), |
228 | # | |
229 | # %token <opval> A | |
230 | # %token <ival> B | |
231 | # %type <pval> C | |
232 | # %type <opval> D | |
233 | # | |
234 | # and (in $tablines), | |
235 | # | |
236 | # yytname[] = { "A" "B", "C", "D", "E" }; | |
0539ab63 DM |
237 | # |
238 | # then return | |
d5c6462e DM |
239 | # |
240 | # typedef enum { toketype_ival, toketype_opval, toketype_pval } toketypes; | |
241 | # | |
242 | # static const toketypes yy_type_tab[] | |
243 | # = { toketype_opval, toketype_ival, toketype_pval, | |
244 | # toketype_opval, toketype_ival } | |
245 | # | |
246 | # where "E" has the default type. The default type is determined | |
247 | # by the __DEFAULT__ comment next to the appropriate union member in | |
248 | # perly.y | |
0539ab63 | 249 | |
d5c6462e | 250 | sub make_type_tab { |
0539ab63 DM |
251 | my ($y_file, $tablines) = @_; |
252 | my %tokens; | |
d5c6462e DM |
253 | my %types; |
254 | my $default_token; | |
0539ab63 DM |
255 | open my $fh, '<', $y_file or die "Can't open $y_file: $!\n"; |
256 | while (<$fh>) { | |
29522234 DM |
257 | if (/(\$\d+)\s*=/) { |
258 | warn "$y_file:$.: dangerous assignment to $1: $_"; | |
259 | } | |
260 | ||
d5c6462e DM |
261 | if (/__DEFAULT__/) { |
262 | m{(\w+) \s* ; \s* /\* \s* __DEFAULT__}x | |
263 | or die "$y_file: can't parse __DEFAULT__ line: $_"; | |
264 | die "$y_file: duplicate __DEFAULT__ line: $_" | |
265 | if defined $default_token; | |
266 | $default_token = $1; | |
267 | next; | |
268 | } | |
269 | ||
270 | next unless /^%(token|type)/; | |
271 | s/^%(token|type)\s+<(\w+)>\s+// | |
272 | or die "$y_file: unparseable token/type line: $_"; | |
273 | $tokens{$_} = $2 for (split ' ', $_); | |
274 | $types{$2} = 1; | |
0539ab63 | 275 | } |
d5c6462e DM |
276 | die "$y_file: no __DEFAULT__ token defined\n" unless $default_token; |
277 | $types{$default_token} = 1; | |
0539ab63 DM |
278 | |
279 | $tablines =~ /^\Qstatic const char *const yytname[] =\E\n | |
280 | {\n | |
281 | (.*?) | |
282 | ^}; | |
283 | /xsm | |
284 | or die "Can't extract yytname[] from table string\n"; | |
285 | my $fields = $1; | |
d5c6462e DM |
286 | $fields =~ s{"([^"]+)"} |
287 | { "toketype_" . | |
288 | (defined $tokens{$1} ? $tokens{$1} : $default_token) | |
289 | }ge; | |
290 | $fields =~ s/, \s* 0 \s* $//x | |
291 | or die "make_type_tab: couldn't delete trailing ',0'\n"; | |
292 | ||
0539ab63 | 293 | return |
d5c6462e DM |
294 | "\ntypedef enum {\n\t" |
295 | . join(", ", map "toketype_$_", sort keys %types) | |
296 | . "\n} toketypes;\n\n" | |
297 | . "/* type of each token/terminal */\n" | |
d5c6462e DM |
298 | . "static const toketypes yy_type_tab[] =\n{\n" |
299 | . $fields | |
300 | . "\n};\n"; | |
0539ab63 DM |
301 | } |
302 | ||
303 | ||
0de566d7 DM |
304 | sub my_system { |
305 | system(@_); | |
306 | if ($? == -1) { | |
d5c6462e | 307 | die "failed to execute command '@_': $!\n"; |
0de566d7 DM |
308 | } |
309 | elsif ($? & 127) { | |
310 | die sprintf "command '@_' died with signal %d\n", | |
311 | ($? & 127); | |
312 | } | |
313 | elsif ($? >> 8) { | |
314 | die sprintf "command '@_' exited with value %d\n", $? >> 8; | |
315 | } | |
316 | } |