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1 | #!/usr/bin/perl |
2 | # |
3 | # regen_perly.pl, DAPM 12-Feb-04 |
4 | # |
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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 |
14 | # |
15 | # perly.act the action case statements extracted from the bison output |
16 | # |
17 | # Note that perly.c is *not* regenerated - this is now a static file which |
18 | # is not dependent on perly.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 perlytmp.h and perlytmp.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 | |
31 | sub usage { die "usage: $0 [ -b bison_executable ] [ file.y ]\n" } |
32 | |
33 | use warnings; |
34 | use strict; |
35 | |
36 | my $bison = 'bison'; |
37 | |
38 | if (@ARGV >= 2 and $ARGV[0] eq '-b') { |
39 | shift; |
40 | $bison = shift; |
41 | } |
42 | |
43 | my $y_file = shift || 'perly.y'; |
44 | |
45 | usage 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 | |
55 | die "$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 | |
67 | my $version = `$bison -V`; |
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68 | unless ($version =~ /\b(1\.875[a-z]?|2\.0)\b/) { die <<EOF; } |
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69 | |
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70 | You have the wrong version of bison in your path; currently 1.875 |
71 | or 2.0 is required. Try installing |
72 | http://ftp.gnu.org/gnu/bison/bison-2.0.tar.gz |
73 | or |
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74 | http://ftp.gnu.org/gnu/bison/bison-1.875.tar.bz2 |
75 | or similar. Your bison identifies itself as: |
76 | |
77 | $version |
78 | EOF |
79 | |
80 | # creates $tmpc_file and $tmph_file |
81 | my_system("$bison -d -o $tmpc_file $y_file"); |
82 | |
83 | open CTMPFILE, $tmpc_file or die "Can't open $tmpc_file: $!\n"; |
84 | my $clines; |
85 | { local $/; $clines = <CTMPFILE>; } |
86 | die "failed to read $tmpc_file: length mismatch\n" |
87 | unless length $clines == -s $tmpc_file; |
88 | close CTMPFILE; |
89 | |
90 | my ($actlines, $tablines) = extract($clines); |
91 | |
92 | chmod 0644, $act_file; |
93 | open ACTFILE, ">$act_file" or die "can't open $act_file: $!\n"; |
94 | print ACTFILE $actlines; |
95 | close ACTFILE; |
96 | chmod 0444, $act_file; |
97 | |
98 | chmod 0644, $tab_file; |
99 | open TABFILE, ">$tab_file" or die "can't open $tab_file: $!\n"; |
100 | print TABFILE $tablines; |
101 | close TABFILE; |
102 | chmod 0444, $tab_file; |
103 | |
104 | unlink $tmpc_file; |
105 | |
106 | # Wrap PERL_CORE round the symbol definitions. Also, the |
107 | # C<#line 123 "perlytmp.h"> gets picked up by make depend, so change it. |
108 | |
109 | open TMPH_FILE, $tmph_file or die "Can't open $tmph_file: $!\n"; |
110 | chmod 0644, $h_file; |
111 | open H_FILE, ">$h_file" or die "Can't open $h_file: $!\n"; |
112 | my $endcore_done = 0; |
113 | while (<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/"perlytmp.h"/"perly.h"/; |
120 | print H_FILE $_; |
121 | } |
122 | close TMPH_FILE; |
123 | close H_FILE; |
124 | chmod 0444, $h_file; |
125 | unlink $tmph_file; |
126 | |
127 | print "rebuilt: $h_file $tab_file $act_file\n"; |
128 | |
129 | exit 0; |
130 | |
131 | |
132 | sub 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]+"perly\.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", $tablines. "\n"; |
172 | } |
173 | |
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174 | sub my_system { |
175 | system(@_); |
176 | if ($? == -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 | } |