gimple.c (walk_gimple_op): Do not request a pure rvalue on the RHS if the LHS is of a non-renamable type.

	* gimple.c (walk_gimple_op) <GIMPLE_ASSIGN>: Do not request a pure
	rvalue on the RHS if the LHS is of a non-renamable type.
	* tree-ssa-ccp.c (maybe_fold_offset_to_component_ref): Fold result.
ada/
	* gcc-interface/ada-tree.h (TYPE_BY_REFERENCE_P): Delete.
	(DECL_CONST_ADDRESS_P): New macro.
	(SET_DECL_ORIGINAL_FIELD_TO_FIELD): Likewise.
	(SAME_FIELD_P): Likewise.
	* gcc-interface/decl.c (constructor_address_p): New static function.
	(gnat_to_gnu_entity) <object>: Set DECL_CONST_ADDRESS_P according to
	the return value of above function.
	(gnat_to_gnu_entity) <E_Record_Type>: Force BLKmode for all types
	passed by reference.
	<E_Record_Subtype>: Likewise.
	Set TREE_ADDRESSABLE on the type if it passed by reference.
	(make_packable_type): Use SET_DECL_ORIGINAL_FIELD_TO_FIELD.
	(create_field_decl_from): Likewise.
	(substitute_in_type): Likewise.
	(purpose_member_field): Use SAME_FIELD_P.
	* gcc-interface/misc.c (must_pass_by_ref): Test TREE_ADDRESSABLE.
	* gcc-interface/trans.c (lvalue_required_p): Add ADDRESS_OF_CONSTANT
	parameter and adjust recursive calls.
	<N_Explicit_Dereference>: New case.
	<N_Object_Declaration>: Return 1 if the object is of a class-wide type.
	Adjust calls to lvalue_required_p.  Do not return the initializer of a
	DECL_CONST_ADDRESS_P constant if an lvalue is required for it.
	(call_to_gnu): Delay issuing error message for a misaligned actual and
	avoid the associated back-end assertion.  Test TREE_ADDRESSABLE.
	(gnat_gimplify_expr) <ADDR_EXPR>: Handle non-static constructors.
	* gcc-interface/utils.c (make_dummy_type): Set TREE_ADDRESSABLE if the
	type is passed by reference.
	(convert) <CONSTRUCTOR>: Convert in-place in more cases.
	* gcc-interface/utils2.c (build_cond_expr): Drop TYPE_BY_REFERENCE_P.
	(build_simple_component_ref): Use SAME_FIELD_P.

From-SVN: r158254

1 files changed, 18 insertions, 3 deletions

diff --git a/gcc/ada/gcc-interface/ada-tree.h b/gcc/ada/gcc-interface/ada-tree.h
index 8a646fe..5c54c30 100644
--- a/gcc/ada/gcc-interface/ada-tree.h
+++ b/gcc/ada/gcc-interface/ada-tree.h
@@ -102,9 +102,6 @@ do {							    \
    front-end.  */
 #define TYPE_EXTRA_SUBTYPE_P(NODE) TYPE_LANG_FLAG_2 (NODE)
 
-/* Nonzero for composite types if this is a by-reference type.  */
-#define TYPE_BY_REFERENCE_P(NODE) TYPE_LANG_FLAG_2 (NODE)
-
 /* For RECORD_TYPE, UNION_TYPE, and QUAL_UNION_TYPE, nonzero if this is the
    type for an object whose type includes its template in addition to
    its value (only true for RECORD_TYPE).  */
@@ -325,6 +322,10 @@ do {						   \
    been elaborated and TREE_READONLY is not set on it.  */
 #define DECL_READONLY_ONCE_ELAB(NODE) DECL_LANG_FLAG_0 (VAR_DECL_CHECK (NODE))
 
+/* Nonzero in a CONST_DECL if its value is (essentially) the address of a
+   constant CONSTRUCTOR.  */
+#define DECL_CONST_ADDRESS_P(NODE) DECL_LANG_FLAG_0 (CONST_DECL_CHECK (NODE))
+
 /* Nonzero if this decl is always used by reference; i.e., an INDIRECT_REF
    is needed to access the object.  */
 #define DECL_BY_REF_P(NODE) DECL_LANG_FLAG_1 (NODE)
@@ -369,6 +370,20 @@ do {						   \
 #define SET_DECL_ORIGINAL_FIELD(NODE, X) \
   SET_DECL_LANG_SPECIFIC (FIELD_DECL_CHECK (NODE), X)
 
+/* Set DECL_ORIGINAL_FIELD of FIELD1 to (that of) FIELD2.  */
+#define SET_DECL_ORIGINAL_FIELD_TO_FIELD(FIELD1, FIELD2)	\
+  SET_DECL_ORIGINAL_FIELD ((FIELD1),				\
+			   DECL_ORIGINAL_FIELD (FIELD2)		\
+			   ? DECL_ORIGINAL_FIELD (FIELD2) : (FIELD2))
+
+/* Return true if FIELD1 and FIELD2 represent the same field.  */
+#define SAME_FIELD_P(FIELD1, FIELD2)					\
+  ((FIELD1) == (FIELD2)							\
+   || DECL_ORIGINAL_FIELD (FIELD1) == (FIELD2)				\
+   || (FIELD1) == DECL_ORIGINAL_FIELD (FIELD2)				\
+   || (DECL_ORIGINAL_FIELD (FIELD1)					\
+       && (DECL_ORIGINAL_FIELD (FIELD1) == DECL_ORIGINAL_FIELD (FIELD2))))
+
 /* In a VAR_DECL, points to the object being renamed if the VAR_DECL is a
    renaming pointer, otherwise 0.  Note that this object is guaranteed to
    be protected against multiple evaluations.  */