From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sat, 9 Jul 2005 08:26:29 +0000 (+0000)
Subject: * data/yacc.c (yyparse): Undo previous patch.  Instead,
X-Git-Tag: BISON-2_1~109
X-Git-Url: https://git.saurik.com/bison.git/commitdiff_plain/407d4a75bb431a24b02e19239e830213e4cd5476?hp=34160ec4ec58f5ece2ef980201aee2fb20cfab46

* data/yacc.c (yyparse): Undo previous patch.  Instead,
set yylsp[0] and yyvsp[0] only if the initial action
sets yylloc and yylval, respectively.
---

diff --git a/ChangeLog b/ChangeLog
index b5f44ada..43e323be 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -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
diff --git a/data/yacc.c b/data/yacc.c
index ebb0c9be..945d0960 100644
--- a/data/yacc.c
+++ b/data/yacc.c
@@ -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.  |