utils2.c (build_compound_expr): New function.

2010-10-26  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>

	* gcc-interface/utils2.c (build_compound_expr): New function.
	* gcc-interface/gigi.h (build_compound_expr): Declare it.
	* gcc-interface/trans.c (Attribute_to_gnu, call_to_gnu): Use it.
	(gnat_to_gnu, case N_Expression_With_Actions): Likewise.

From-SVN: r165958

gcc/ada/ChangeLog

+2010-10-26  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
+
+	* gcc-interface/utils2.c (build_compound_expr): New function.
+	* gcc-interface/gigi.h (build_compound_expr): Declare it.
+	* gcc-interface/trans.c (Attribute_to_gnu, call_to_gnu): Use it.
+	(gnat_to_gnu, case N_Expression_With_Actions): Likewise. 
+
 2010-10-26  Javier Miranda  <miranda@adacore.com>
 
 	* sem_prag.adb (Process_Import_Or_Interface): Skip primitives of

gcc/ada/gcc-interface/gigi.h

@@ -777,6 +777,11 @@ extern tree build_unary_op (enum tree_code op_code, tree result_type,
 extern tree build_cond_expr (tree result_type, tree condition_operand,
                              tree true_operand, tree false_operand);
 
+/* Similar, but for COMPOUND_EXPR.  */
+
+extern tree build_compound_expr (tree result_type, tree stmt_operand,
+				 tree expr_operand);
+
 /* Similar, but for RETURN_EXPR.  */
 extern tree build_return_expr (tree ret_obj, tree ret_val);
 

gcc/ada/gcc-interface/trans.c

@@ -1955,8 +1955,8 @@ Attribute_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, int attribute)
      example in AARM 11.6(5.e).  */
   if (prefix_unused && TREE_SIDE_EFFECTS (gnu_prefix)
       && !Is_Entity_Name (Prefix (gnat_node)))
-    gnu_result = fold_build2 (COMPOUND_EXPR, TREE_TYPE (gnu_result),
-			      gnu_prefix, gnu_result);
+    gnu_result = build_compound_expr  (TREE_TYPE (gnu_result), gnu_prefix,
+				       gnu_result);
 
   *gnu_result_type_p = gnu_result_type;
   return gnu_result;
@@ -2921,7 +2921,7 @@ call_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, tree gnu_target)
 
 	  /* But initialize it on the fly like for an implicit temporary as
 	     we aren't necessarily dealing with a statement.  */
-	  gnu_name = build2 (COMPOUND_EXPR, TREE_TYPE (gnu_name), gnu_stmt,
+	  gnu_name = build_compound_expr (TREE_TYPE (gnu_name), gnu_stmt,
 					  gnu_temp);
 
 	  /* Set up to move the copy back to the original if needed.  */
@@ -3307,19 +3307,8 @@ call_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, tree gnu_target)
   /* If we need a value, make a COMPOUND_EXPR to return it; otherwise,
      return the result.  Deal specially with UNCONSTRAINED_ARRAY_REF.  */
   if (returning_value)
-    {
-      if (TREE_CODE (gnu_call) == UNCONSTRAINED_ARRAY_REF
-	  || TREE_CODE (gnu_call) == INDIRECT_REF)
-	gnu_result = build1 (TREE_CODE (gnu_call), TREE_TYPE (gnu_call),
-			     fold_build2 (COMPOUND_EXPR,
-					  TREE_TYPE (TREE_OPERAND (gnu_call,
-								   0)),
-					  gnu_result,
-					  TREE_OPERAND (gnu_call, 0)));
-      else
-	gnu_result = fold_build2 (COMPOUND_EXPR, TREE_TYPE (gnu_call),
-				  gnu_result, gnu_call);
-    }
+    gnu_result = build_compound_expr (TREE_TYPE (gnu_call), gnu_result,
+				      gnu_call);
 
   return gnu_result;
 }
@@ -5525,7 +5514,7 @@ gnat_to_gnu (Node_Id gnat_node)
       TREE_SIDE_EFFECTS (gnu_result) = 1;
       gnu_expr = gnat_to_gnu (Expression (gnat_node));
       gnu_result
-	= build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr), gnu_result, gnu_expr);
+	= build_compound_expr (TREE_TYPE (gnu_expr), gnu_result, gnu_expr);
       break;
 
     case N_Freeze_Entity:

gcc/ada/gcc-interface/utils2.c

@@ -1372,6 +1372,33 @@ build_cond_expr (tree result_type, tree condition_operand,
   return result;
 }
 
+/* Similar, but for COMPOUND_EXPR.  */
+
+tree
+build_compound_expr (tree result_type, tree stmt_operand, tree expr_operand)
+{
+  bool addr_p = false;
+  tree result;
+
+  /* If the result type is unconstrained, take the address of the operand and
+     then dereference the result.  Likewise if the result type is passed by
+     reference, but this is natively handled in the gimplifier.  */
+  if (TREE_CODE (result_type) == UNCONSTRAINED_ARRAY_TYPE
+      || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (result_type)))
+    {
+      result_type = build_pointer_type (result_type);
+      expr_operand = build_unary_op (ADDR_EXPR, result_type, expr_operand);
+      addr_p = true;
+    }
+
+  result = fold_build2 (COMPOUND_EXPR, result_type, stmt_operand,
+			expr_operand);
+
+  if (addr_p)
+    result = build_unary_op (INDIRECT_REF, NULL_TREE, result);
+
+  return result;
+}
 /* Similar, but for RETURN_EXPR.  If RET_VAL is non-null, build a RETURN_EXPR
    around the assignment of RET_VAL to RET_OBJ.  Otherwise just build a bare
    RETURN_EXPR around RESULT_OBJ, which may be null in this case.  */