cp-objcp-common.c (cp_expr_size): Return NULL in the case size is undefined.

	* cp-objcp-common.c (cp_expr_size): Return NULL in the case
	size is undefined.

	* builtins.c (fold_builtin_memory_op): Check that expr_size match.
	* explow.c (expr_size, int_expr_size): Assert that size is non_NULL.

From-SVN: r119515

gcc/ChangeLog

+2006-12-04  Jan Hubicka  <jh@suse.cz>
+
+	* builtins.c (fold_builtin_memory_op): Check that expr_size match.
+	* explow.c (expr_size, int_expr_size): Assert that size is non_NULL.
+
 2006-12-04  Daniel Berlin  <dberlin@dberlin.org>
 	
 	* tree-ssa-alias.c (compute_may_aliases):

gcc/builtins.c

@@ -8202,8 +8202,8 @@ fold_builtin_memory_op (tree arglist, tree type, bool ignore, int endp)
 	  || !TYPE_SIZE_UNIT (desttype)
 	  || TREE_CODE (TYPE_SIZE_UNIT (srctype)) != INTEGER_CST
 	  || TREE_CODE (TYPE_SIZE_UNIT (desttype)) != INTEGER_CST
-	  || !operand_equal_p (TYPE_SIZE_UNIT (srctype), len, 0)
-	  || !operand_equal_p (TYPE_SIZE_UNIT (desttype), len, 0))
+	  || !tree_int_cst_equal (TYPE_SIZE_UNIT (srctype), len)
+	  || !tree_int_cst_equal (TYPE_SIZE_UNIT (desttype), len))
 	return 0;
 
       if (get_pointer_alignment (dest, BIGGEST_ALIGNMENT) 
@@ -8218,6 +8218,8 @@ fold_builtin_memory_op (tree arglist, tree type, bool ignore, int endp)
       srcvar = build_fold_indirect_ref (src);
       if (TREE_THIS_VOLATILE (srcvar))
 	return 0;
+      if (!tree_int_cst_equal (lang_hooks.expr_size (srcvar), len))
+	return 0;
       /* With memcpy, it is possible to bypass aliasing rules, so without
          this check i. e. execute/20060930-2.c would be misoptimized, because
 	 it use conflicting alias set to hold argument for the memcpy call.
@@ -8233,6 +8235,8 @@ fold_builtin_memory_op (tree arglist, tree type, bool ignore, int endp)
       destvar = build_fold_indirect_ref (dest);
       if (TREE_THIS_VOLATILE (destvar))
 	return 0;
+      if (!tree_int_cst_equal (lang_hooks.expr_size (destvar), len))
+	return 0;
       if (!var_decl_component_p (destvar))
 	return 0;
 

gcc/cp/ChangeLog

+2006-12-04  Jan Hubicka  <jh@suse.cz>
+
+	* cp-objcp-common.c (cp_expr_size): Return NULL in the case
+	size is undefined.
+
 2006-12-04  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/29733

gcc/cp/cp-objcp-common.c

@@ -82,29 +82,29 @@ cp_expr_size (tree exp)
       /* The backend should not be interested in the size of an expression
 	 of a type with both of these set; all copies of such types must go
 	 through a constructor or assignment op.  */
-      gcc_assert (!TYPE_HAS_COMPLEX_INIT_REF (type)
-		  || !TYPE_HAS_COMPLEX_ASSIGN_REF (type)
-		  /* But storing a CONSTRUCTOR isn't a copy.  */
-		  || TREE_CODE (exp) == CONSTRUCTOR
-		  /* And, the gimplifier will sometimes make a copy of
-		     an aggregate.  In particular, for a case like:
-
-			struct S { S(); };
-			struct X { int a; S s; };
-			X x = { 0 };
-
-		     the gimplifier will create a temporary with
-		     static storage duration, perform static
-		     initialization of the temporary, and then copy
-		     the result.  Since the "s" subobject is never
-		     constructed, this is a valid transformation.  */
-		  || CP_AGGREGATE_TYPE_P (type));
-
-      /* This would be wrong for a type with virtual bases, but they are
-	 caught by the assert above.  */
-      return (is_empty_class (type)
-	      ? size_zero_node
-	      : CLASSTYPE_SIZE_UNIT (type));
+      if (!TYPE_HAS_COMPLEX_INIT_REF (type)
+	  || !TYPE_HAS_COMPLEX_ASSIGN_REF (type)
+	  /* But storing a CONSTRUCTOR isn't a copy.  */
+	  || TREE_CODE (exp) == CONSTRUCTOR
+	  /* And, the gimplifier will sometimes make a copy of
+	     an aggregate.  In particular, for a case like:
+
+		struct S { S(); };
+		struct X { int a; S s; };
+		X x = { 0 };
+
+	     the gimplifier will create a temporary with
+	     static storage duration, perform static
+	     initialization of the temporary, and then copy
+	     the result.  Since the "s" subobject is never
+	     constructed, this is a valid transformation.  */
+	  || CP_AGGREGATE_TYPE_P (type))
+	/* This would be wrong for a type with virtual bases.  */
+	return (is_empty_class (type)
+		? size_zero_node
+		: CLASSTYPE_SIZE_UNIT (type));
+      else
+	return NULL_TREE;
     }
   else
     /* Use the default code.  */

gcc/explow.c

@@ -245,7 +245,11 @@ expr_size (tree exp)
   if (TREE_CODE (exp) == WITH_SIZE_EXPR)
     size = TREE_OPERAND (exp, 1);
   else
-    size = SUBSTITUTE_PLACEHOLDER_IN_EXPR (lang_hooks.expr_size (exp), exp);
+    {
+      size = lang_hooks.expr_size (exp);
+      gcc_assert (size);
+      size = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, exp);
+    }
 
   return expand_expr (size, NULL_RTX, TYPE_MODE (sizetype), 0);
 }
@@ -261,7 +265,10 @@ int_expr_size (tree exp)
   if (TREE_CODE (exp) == WITH_SIZE_EXPR)
     size = TREE_OPERAND (exp, 1);
   else
-    size = lang_hooks.expr_size (exp);
+    {
+      size = lang_hooks.expr_size (exp);
+      gcc_assert (size);
+    }
 
   if (size == 0 || !host_integerp (size, 0))
     return -1;