c-parse.in (malloced_yyss, [...]): New.

        * c-parse.in (malloced_yyss, malloced_yyvs): New.
        (yyoverflow): Re-add.  Set them.
        (free_parser_stacks): New.
        * c-common.h: Declare it.
        * c-lex.c (c_common_parse_file): Call it.

        * parse.y (malloced_yyss, malloced_yyvs): New.
        (yyoverflow): Re-add.  Set them.
        (free_parser_stacks): New.

From-SVN: r52827

1 files changed, 55 insertions, 0 deletions

diff --git a/gcc/c-parse.in b/gcc/c-parse.in
index ff279a1..679d42d 100644
--- a/gcc/c-parse.in
+++ b/gcc/c-parse.in
@@ -61,6 +61,49 @@ end ifobjc
 
 /* Like YYERROR but do call yyerror.  */
 #define YYERROR1 { yyerror ("syntax error"); YYERROR; }
+
+/* Like the default stack expander, except (1) use realloc when possible,
+   (2) impose no hard maxiumum on stack size, (3) REALLY do not use alloca.
+
+   Irritatingly, YYSTYPE is defined after this %{ %} block, so we cannot
+   give malloced_yyvs its proper type.  This is ok since all we need from
+   it is to be able to free it.  */
+
+static short *malloced_yyss;
+static void *malloced_yyvs;
+
+#define yyoverflow(MSG, SS, SSSIZE, VS, VSSIZE, YYSSZ)			\
+do {									\
+  size_t newsize;							\
+  short *newss;								\
+  YYSTYPE *newvs;							\
+  newsize = *(YYSSZ) *= 2;						\
+  if (malloced_yyss)							\
+    {									\
+      newss = (short *)							\
+	really_call_realloc (*(SS), newsize * sizeof (short));		\
+      newvs = (YYSTYPE *)						\
+	really_call_realloc (*(VS), newsize * sizeof (YYSTYPE));	\
+    }									\
+  else									\
+    {									\
+      newss = (short *) really_call_malloc (newsize * sizeof (short));	\
+      newvs = (YYSTYPE *) really_call_malloc (newsize * sizeof (YYSTYPE)); \
+      if (newss)							\
+        memcpy (newss, *(SS), (SSSIZE));				\
+      if (newvs)							\
+        memcpy (newvs, *(VS), (VSSIZE));				\
+    }									\
+  if (!newss || !newvs)							\
+    {									\
+      yyerror (MSG);							\
+      return 2;								\
+    }									\
+  *(SS) = newss;							\
+  *(VS) = newvs;							\
+  malloced_yyss = newss;						\
+  malloced_yyvs = (void *) newvs;					\
+} while (0)
 %}
 
 %start program
@@ -3908,3 +3951,15 @@ make_pointer_declarator (type_quals_attrs, target)
     itarget = tree_cons (attrs, target, NULL_TREE);
   return build1 (INDIRECT_REF, quals, itarget);
 }
+
+/* Free malloced parser stacks if necessary.  */
+
+void
+free_parser_stacks ()
+{
+  if (malloced_yyss)
+    {
+      free (malloced_yyss);
+      free (malloced_yyvs);
+    }
+}