Fix impure push parser compile error reported by Bob Rossi at

<http://lists.gnu.org/archive/html/help-bison/2008-02/msg00023.html>.
* data/yacc.c: Clean up whitespace in the output a little.
(yypstate_allocated): Define for impure push parsers regardless of
whether the pull interface is also requested.
* tests/push.at (Push Parsing: Multiple impure instances): Extend to
check impure push parsers without the pull interface.

* data/yacc.c (yypstate_new): Don't try to invoke yyerror since
yyerror takes arguments specified by %parse-param while yypstate_new
does not.
* doc/bison.texinfo (Parser Create Function): Document that
yypstate_new returns 0 for multiple impure parser instances.
* tests/push.at (Push Parsing: Multiple impure instances): Update
expected stderr output.

4 files changed, 44 insertions, 30 deletions

diff --git a/ChangeLog b/ChangeLog
index 2b63b9ec..a7fef295 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,21 @@
+2008-02-20  Joel E. Denny  <jdenny@ces.clemson.edu>
+
+	Fix impure push parser compile error reported by Bob Rossi at
+	<http://lists.gnu.org/archive/html/help-bison/2008-02/msg00023.html>.
+	* data/yacc.c: Clean up whitespace in the output a little.
+	(yypstate_allocated): Define for impure push parsers regardless of
+	whether the pull interface is also requested.
+	* tests/push.at (Push Parsing: Multiple impure instances): Extend to
+	check impure push parsers without the pull interface.
+
+	* data/yacc.c (yypstate_new): Don't try to invoke yyerror since
+	yyerror takes arguments specified by %parse-param while yypstate_new
+	does not.
+	* doc/bison.texinfo (Parser Create Function): Document that
+	yypstate_new returns 0 for multiple impure parser instances.
+	* tests/push.at (Push Parsing: Multiple impure instances): Update
+	expected stderr output.
+
 2008-02-19  Joel E. Denny  <jdenny@ces.clemson.edu>
 
 	* runtime-po/POTFILES.in (push.c): Remove.
diff --git a/data/yacc.c b/data/yacc.c
index 7e94146e..b871118a 100644
--- a/data/yacc.c
+++ b/data/yacc.c
@@ -1079,26 +1079,25 @@ b4_push_if(
     /* Used to determine if this is the first time this instance has
        been used.  */
     int yynew;
-  };
+  };]b4_pure_if([], [[
 
-]b4_pull_if([b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
+static char yypstate_allocated = 0;]])b4_pull_if([
+
+b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
 {
   return yypull_parse (0]m4_ifset([b4_parse_param],
                                   [[, ]b4_c_args(b4_parse_param)])[);
-}]b4_pure_if([], [[
-
-static char yypstate_allocated = 0;]])[
+}
 
 ]b4_c_function_def([[yypull_parse]], [[int]],
   [[[yypstate *yyps]], [[yyps]]]m4_ifset([b4_parse_param], [,
   b4_parse_param]))[
 {
   int yystatus;
-  yypstate *yyps_local;
-]b4_pure_if([[  int yychar;
-  YYSTYPE yylval;
-]b4_locations_if([[  YYLTYPE yylloc;
-]])])[
+  yypstate *yyps_local;]b4_pure_if([[
+  int yychar;
+  YYSTYPE yylval;]b4_locations_if([[
+  YYLTYPE yylloc;]])])[
   if (yyps == 0)
     {
       yyps_local = yypstate_new ();
@@ -1120,17 +1119,14 @@ static char yypstate_allocated = 0;]])[
   if (yyps == 0)
     yypstate_delete (yyps_local);
   return yystatus;
-}
-]])[
+}]])[
+
 /* Initialize the parser data structure.  */
 ]b4_c_function_def([[yypstate_new]], [[yypstate *]])[
 {
   yypstate *yyps;]b4_pure_if([], [[
   if (yypstate_allocated)
-    {
-      yyerror (]b4_yyerror_args[YY_("cannot allocate multiple impure push-parser instances"));
-      return 0;
-    }]])[
+    return 0;]])[
   yyps = (yypstate *) malloc (sizeof *yyps);
   if (!yyps)
     return 0;
diff --git a/doc/bison.texinfo b/doc/bison.texinfo
index bb6d5dcc..d513b555 100644
--- a/doc/bison.texinfo
+++ b/doc/bison.texinfo
@@ -5339,7 +5339,9 @@ This function is available if either the @code{%define api.push_pull "push"} or
 
 @deftypefun yypstate *yypstate_new (void)
 The fuction will return a valid parser instance if there was memory available
-or NULL if no memory was available.
+or 0 if no memory was available.
+In impure mode, it will also return 0 if a parser instance is currently
+allocated.
 @end deftypefun
 
 @node Parser Delete Function
diff --git a/tests/push.at b/tests/push.at
index 53b20b7d..70c1fdce 100644
--- a/tests/push.at
+++ b/tests/push.at
@@ -83,6 +83,7 @@ AT_CLEANUP
 
 AT_SETUP([[Push Parsing: Multiple impure instances]])
 
+m4_pushdef([AT_MULTIPLE_IMPURE_INSTANCES_CHECK], [
 AT_DATA_GRAMMAR([[input.y]],
 [[
 %{
@@ -92,7 +93,7 @@ AT_DATA_GRAMMAR([[input.y]],
   int yylex (void);
 %}
 
-%define api.push_pull "both"
+%define api.push_pull "]$1["
 
 %%
 
@@ -123,11 +124,11 @@ main (void)
       ps = yypstate_new ();
       assert (ps);
       assert (yypstate_new () == NULL);
-      assert (yyparse () == 2);
+      ]m4_if([$1], [[both]], [[assert (yyparse () == 2)]])[;
       yychar = 0;
       assert (yypush_parse (ps) == 0);
       assert (yypstate_new () == NULL);
-      assert (yyparse () == 2);
+      ]m4_if([$1], [[both]], [[assert (yyparse () == 2)]])[;
       yypstate_delete (ps);
     }
 
@@ -137,16 +138,13 @@ main (void)
 
 AT_BISON_CHECK([[-o input.c input.y]])
 AT_COMPILE([[input]])
-AT_PARSER_CHECK([[./input]], 0, [],
-[[cannot allocate multiple impure push-parser instances
-cannot allocate multiple impure push-parser instances
-cannot allocate multiple impure push-parser instances
-cannot allocate multiple impure push-parser instances
-cannot allocate multiple impure push-parser instances
-cannot allocate multiple impure push-parser instances
-cannot allocate multiple impure push-parser instances
-cannot allocate multiple impure push-parser instances
-]])
+AT_PARSER_CHECK([[./input]])
+])
+
+AT_MULTIPLE_IMPURE_INSTANCES_CHECK([[both]])
+AT_MULTIPLE_IMPURE_INSTANCES_CHECK([[push]])
+
+m4_popdef([AT_MULTIPLE_IMPURE_INSTANCES_CHECK])
 
 AT_CLEANUP