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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 |
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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 | |
32 | sub usage { die "usage: $0 [ -b bison_executable ] [ file.y ]\n" } |
33 | |
34 | use warnings; |
35 | use strict; |
36 | |
37 | my $bison = 'bison'; |
38 | |
39 | if (@ARGV >= 2 and $ARGV[0] eq '-b') { |
40 | shift; |
41 | $bison = shift; |
42 | } |
43 | |
44 | my $y_file = shift || 'perly.y'; |
45 | |
46 | usage 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 | |
56 | die "$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 | |
68 | my $version = `$bison -V`; |
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69 | unless ($version =~ /\b(1\.875[a-z]?|2\.[01])\b/) { die <<EOF; } |
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70 | |
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71 | You have the wrong version of bison in your path; currently 1.875 |
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72 | 2.0 or 2.1 is required. Try installing |
73 | http://ftp.gnu.org/gnu/bison/bison-2.1.tar.gz |
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74 | or similar. Your bison identifies itself as: |
75 | |
76 | $version |
77 | EOF |
78 | |
79 | # creates $tmpc_file and $tmph_file |
80 | my_system("$bison -d -o $tmpc_file $y_file"); |
81 | |
82 | open CTMPFILE, $tmpc_file or die "Can't open $tmpc_file: $!\n"; |
83 | my $clines; |
84 | { local $/; $clines = <CTMPFILE>; } |
85 | die "failed to read $tmpc_file: length mismatch\n" |
86 | unless length $clines == -s $tmpc_file; |
87 | close CTMPFILE; |
88 | |
89 | my ($actlines, $tablines) = extract($clines); |
90 | |
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91 | $tablines .= make_opval_tab($y_file, $tablines); |
92 | |
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93 | chmod 0644, $act_file; |
94 | open ACTFILE, ">$act_file" or die "can't open $act_file: $!\n"; |
95 | print ACTFILE $actlines; |
96 | close ACTFILE; |
97 | chmod 0444, $act_file; |
98 | |
99 | chmod 0644, $tab_file; |
100 | open TABFILE, ">$tab_file" or die "can't open $tab_file: $!\n"; |
101 | print TABFILE $tablines; |
102 | close TABFILE; |
103 | chmod 0444, $tab_file; |
104 | |
105 | unlink $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 | |
110 | open TMPH_FILE, $tmph_file or die "Can't open $tmph_file: $!\n"; |
111 | chmod 0644, $h_file; |
112 | open H_FILE, ">$h_file" or die "Can't open $h_file: $!\n"; |
113 | my $endcore_done = 0; |
114 | while (<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 | $endcore_done = 1; |
119 | } |
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120 | s/"$tmph_file"/"$h_file"/; |
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121 | print H_FILE $_; |
122 | } |
123 | close TMPH_FILE; |
124 | close H_FILE; |
125 | chmod 0444, $h_file; |
126 | unlink $tmph_file; |
127 | |
128 | print "rebuilt: $h_file $tab_file $act_file\n"; |
129 | |
130 | exit 0; |
131 | |
132 | |
133 | sub 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* |
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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 $tablines for the table yytname which gives |
178 | # the token index of each token/non-terminal, then use this to |
179 | # create a new table, indexed by token number, which indicates |
180 | # whether that token is of type opval. |
181 | # |
182 | # ie given |
183 | # %token <opval> A B |
184 | # %type <opval> C D |
185 | # |
186 | # and yytname[] = { "A" "B", "C", "D", "E", "F" }; |
187 | # |
188 | # then return |
189 | # static const int yy_is_opval[] = { 1, 1, 1, 1, 0, 0 } |
190 | |
191 | sub make_opval_tab { |
192 | my ($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" . $fields . "\n};\n"; |
211 | } |
212 | |
213 | |
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214 | sub my_system { |
215 | system(@_); |
216 | if ($? == -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 | } |