trans.c (call_to_gnu): Open a nesting level if this is a statement.

	* gcc-interface/trans.c (call_to_gnu): Open a nesting level if this is
	a statement.  Otherwise, if at top-level, push the processing of the
	elaboration routine.  In the misaligned case, issue the error messages
	again on entry and create the temporary explicitly.  Do not issue them
	for CONSTRUCTORs.
	For a function call, emit the range check if necessary.
	In the copy-in copy-out case, create the temporary for the return
	value explicitly.
	Do not unnecessarily convert by-ref parameters to the formal's type.
	Remove obsolete guards in conditions.
	(gnat_to_gnu) <N_Assignment_Statement>: For a function call, pass the
	target to call_to_gnu in all cases.
	(gnat_gimplify_expr) <ADDR_EXPR>: Remove handling of SAVE_EXPR.
	(addressable_p) <CONSTRUCTOR>: Return false if not static.
	<COMPOUND_EXPR>: New case.
	* gcc-interface/utils2.c (build_unary_op) <ADDR_EXPR>: Fold a compound
	expression if it has unconstrained array type.
	(gnat_mark_addressable) <COMPOUND_EXPR>: New case.
	(gnat_stabilize_reference) <COMPOUND_EXPR>: Stabilize operands on an
	individual basis.

From-SVN: r158371

gcc/ada/ChangeLog

 2010-04-15  Eric Botcazou  <ebotcazou@adacore.com>
 
+	* gcc-interface/trans.c (call_to_gnu): Open a nesting level if this is
+	a statement.  Otherwise, if at top-level, push the processing of the
+	elaboration routine.  In the misaligned case, issue the error messages
+	again on entry and create the temporary explicitly.  Do not issue them
+	for CONSTRUCTORs.
+	For a function call, emit the range check if necessary.
+	In the copy-in copy-out case, create the temporary for the return
+	value explicitly.
+	Do not unnecessarily convert by-ref parameters to the formal's type.
+	Remove obsolete guards in conditions.
+	(gnat_to_gnu) <N_Assignment_Statement>: For a function call, pass the
+	target to call_to_gnu in all cases.
+	(gnat_gimplify_expr) <ADDR_EXPR>: Remove handling of SAVE_EXPR.
+	(addressable_p) <CONSTRUCTOR>: Return false if not static.
+	<COMPOUND_EXPR>: New case.
+	* gcc-interface/utils2.c (build_unary_op) <ADDR_EXPR>: Fold a compound
+	expression if it has unconstrained array type.
+	(gnat_mark_addressable) <COMPOUND_EXPR>: New case.
+	(gnat_stabilize_reference) <COMPOUND_EXPR>: Stabilize operands on an
+	individual basis.
+
+2010-04-15  Eric Botcazou  <ebotcazou@adacore.com>
+
 	* gcc-interface/trans.c (gigi): Do not start statement group.
 	(Compilation_Unit_to_gnu): Set current_function_decl to NULL.
 	Start statement group and push binding level here...

gcc/ada/gcc-interface/utils2.c

@@ -1025,6 +1025,22 @@ build_unary_op (enum tree_code op_code, tree result_type, tree operand)
 	  TREE_TYPE (result) = type = build_pointer_type (type);
 	  break;
 
+	case COMPOUND_EXPR:
+	  /* Fold a compound expression if it has unconstrained array type
+	     since the middle-end cannot handle it.  But we don't it in the
+	     general case because it may introduce aliasing issues if the
+	     first operand is an indirect assignment and the second operand
+	     the corresponding address, e.g. for an allocator.  */
+	  if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
+	    {
+	      result = build_unary_op (ADDR_EXPR, result_type,
+				       TREE_OPERAND (operand, 1));
+	      result = build2 (COMPOUND_EXPR, TREE_TYPE (result),
+			       TREE_OPERAND (operand, 0), result);
+	      break;
+	    }
+	  goto common;
+
 	case ARRAY_REF:
 	case ARRAY_RANGE_REF:
 	case COMPONENT_REF:
@@ -2119,6 +2135,10 @@ gnat_mark_addressable (tree t)
 	t = TREE_OPERAND (t, 0);
 	break;
 
+      case COMPOUND_EXPR:
+	t = TREE_OPERAND (t, 1);
+	break;
+
       case CONSTRUCTOR:
 	TREE_ADDRESSABLE (t) = 1;
 	return true;
@@ -2377,10 +2397,17 @@ gnat_stabilize_reference (tree ref, bool force, bool *success)
       break;
 
     case CALL_EXPR:
-    case COMPOUND_EXPR:
       result = gnat_stabilize_reference_1 (ref, force);
       break;
 
+    case COMPOUND_EXPR:
+      result = build2 (COMPOUND_EXPR, type,
+		       gnat_stabilize_reference (TREE_OPERAND (ref, 0), force,
+						 success),
+		       gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
+						   force));
+      break;
+
     case CONSTRUCTOR:
       /* Constructors with 1 element are used extensively to formally
 	 convert objects to special wrapping types.  */