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* data/yacc.c (yyparse): Undo previous patch. Instead,

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set yylsp[0] and yyvsp[0] only if the initial action
sets yylloc and yylval, respectively.
This commit is contained in:
Paul Eggert
2005-07-09 08:26:29 +00:00
parent 34160ec4ec
commit 407d4a75bb
2 changed files with 13 additions and 5 deletions
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4
ChangeLog
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@@ -1,5 +1,9 @@
2005-07-09 Paul Eggert <eggert@cs.ucla.edu>
* data/yacc.c (yyparse): Undo previous patch. Instead,
set yylsp[0] and yyvsp[0] only if the initial action
sets yylloc and yylval, respectively.
* data/yacc.c (yyparse): In the initial action, set
yylsp[0] and yyvsp[0] rather than yylloc and yylval.
This avoids the use of undefined variables if the initial

14
data/yacc.c
View File

@@ -859,16 +859,20 @@ b4_c_function_def([yyparse], [int], b4_parse_param)
#endif
]])
m4_ifdef([b4_initial_action], [
m4_pushdef([b4_at_dollar], [[yylsp[0]]])dnl
m4_pushdef([b4_dollar_dollar], [[yyvsp[0]]])dnl
m4_pushdef([b4_at_dollar], [m4_define([b4_at_dollar_used])yylloc])dnl
m4_pushdef([b4_dollar_dollar], [m4_define([b4_dollar_dollar_used])yylval])dnl
/* User initialization code. */
b4_initial_action
m4_popdef([b4_dollar_dollar])dnl
m4_popdef([b4_at_dollar])dnl
/* Line __line__ of yacc.c. */
b4_syncline([@oline@], [@ofile@])])dnl
[
goto yysetstate;
b4_syncline([@oline@], [@ofile@])
])dnl
m4_ifdef([b4_dollar_dollar_used],[[ yyvsp[0] = yylval;
]])dnl
m4_ifdef([b4_at_dollar_used], [[ yylsp[0] = yylloc;
]])dnl
[ goto yysetstate;
/*------------------------------------------------------------.
| yynewstate -- Push a new state, which is found in yystate. |