re PR target/34982 (calling a function with undefined parameters causes…

re PR target/34982 (calling a function with undefined parameters causes segmentation fault at -O1 or higher)


	PR target/34982
	* i386.c (init_cumulative_args): Use real function declaration when
	calling locally.

From-SVN: r131966

gcc/ChangeLog

+2008-01-30  Jan Hubicka  <jh@suse.cz>
+
+	PR target/34982
+	* i386.c (init_cumulative_args): Use real function declaration when
+	calling locally.
+
 2008-01-30  Richard Sandiford  <rsandifo@nildram.co.uk>
 
 	PR rtl-optimization/34998

gcc/config/i386/i386.c

@@ -3432,6 +3432,7 @@ init_cumulative_args (CUMULATIVE_ARGS *cum,  /* Argument info to initialize */
 		      rtx libname,	/* SYMBOL_REF of library name or 0 */
 		      tree fndecl)
 {
+  struct cgraph_local_info *i = fndecl ? cgraph_local_info (fndecl) : NULL;
   memset (cum, 0, sizeof (*cum));
 
   /* Set up the number of registers to use for passing arguments.  */
@@ -3442,6 +3443,15 @@ init_cumulative_args (CUMULATIVE_ARGS *cum,  /* Argument info to initialize */
     cum->mmx_nregs = MMX_REGPARM_MAX;
   cum->warn_sse = true;
   cum->warn_mmx = true;
+
+  /* Because type might mismatch in between caller and callee, we need to
+     use actual type of function for local calls.
+     FIXME: cgraph_analyze can be told to actually record if function uses
+     va_start so for local functions maybe_vaarg can be made aggressive
+     helping K&R code.
+     FIXME: once typesytem is fixed, we won't need this code anymore.  */
+  if (i && i->local)
+    fntype = TREE_TYPE (fndecl);
   cum->maybe_vaarg = (fntype
 		      ? (!prototype_p (fntype) || stdarg_p (fntype))
 		      : !libname);

gcc/testsuite/ChangeLog

+2008-01-30  Jan Hubicka  <jh@suse.cz>
+
+	PR target/34982
+	* gcc.c-torture/execute/pr34982.c: New testcase
+
 2008-01-30  Andreas Krebbel  <krebbel1@de.ibm.com>
 
 	* gcc.target/s390/tf_to_di-1.c: New testcase.

gcc/testsuite/gcc.c-torture/execute/pr34982.c

+extern void abort (void);
+
+static void something();
+
+int main()
+{
+  something(-1);
+}
+
+static void something(int i)
+{
+  if (i != -1)
+    abort ();
+}