decl.c (gnat_to_gnu_entity): Force all local variables with aggregate types in memory if not optimizing.

* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: Force all local
	variables with aggregate types in memory if not optimizing.

From-SVN: r203507

gcc/ada/ChangeLog

@@ -1,3 +1,8 @@
+2013-10-13  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: Force all local
+	variables with aggregate types in memory if not optimizing.
+
 2013-10-13  Hristian Kirtchev  <kirtchev@adacore.com>
 
 	* sem_prag.adb (Check_Mode): Do

gcc/ada/gcc-interface/decl.c

@@ -1497,7 +1497,7 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
 	/* If we are defining an Out parameter and optimization isn't enabled,
 	   create a fake PARM_DECL for debugging purposes and make it point to
 	   the VAR_DECL.  Suppress debug info for the latter but make sure it
-	   will live on the stack so that it can be accessed from within the
+	   will live in memory so that it can be accessed from within the
 	   debugger through the PARM_DECL.  */
 	if (kind == E_Out_Parameter
 	    && definition
@@ -1520,7 +1520,7 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
 	/* If this is a renaming pointer, attach the renamed object to it and
 	   register it if we are at the global level.  Note that an external
 	   constant is at the global level.  */
-	else if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
+	if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj)
 	  {
 	    SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj);
 	    if ((!definition && kind == E_Constant) || global_bindings_p ())
@@ -1579,6 +1579,19 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
 	    && Has_Nested_Block_With_Handler (Scope (gnat_entity)))
 	  TREE_ADDRESSABLE (gnu_decl) = 1;
 
+	/* If this is a local variable with non-BLKmode and aggregate type,
+	   and optimization isn't enabled, then force it in memory so that
+	   a register won't be allocated to it with possible subparts left
+	   uninitialized and reaching the register allocator.  */
+	else if (TREE_CODE (gnu_decl) == VAR_DECL
+		 && !DECL_EXTERNAL (gnu_decl)
+		 && !TREE_STATIC (gnu_decl)
+		 && DECL_MODE (gnu_decl) != BLKmode
+		 && AGGREGATE_TYPE_P (TREE_TYPE (gnu_decl))
+		 && !TYPE_IS_FAT_POINTER_P (TREE_TYPE (gnu_decl))
+		 && !optimize)
+	  TREE_ADDRESSABLE (gnu_decl) = 1;
+
 	/* If we are defining an object with variable size or an object with
 	   fixed size that will be dynamically allocated, and we are using the
 	   setjmp/longjmp exception mechanism, update the setjmp buffer.  */

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2013-10-13  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* gnat.dg/uninit_array.ad[sn]: New test.
+	* gnat.dg/uninit_array_pkg.ads: New helper.
+
 2013-10-13  Richard Biener  <rguenther@suse.de>
 
 	* gcc.c-torture/execute/pr58662.c: New test.

gcc/testsuite/gnat.dg/uninit_array.adb

@@ -0,0 +1,22 @@
+-- { dg-do compile }
+-- { dg-options "-gnatws" }
+
+with Uninit_Array_Pkg; use Uninit_Array_Pkg;
+
+package body Uninit_Array is
+
+  function F1 return Integer;
+  pragma Inline_Always (F1);
+
+  function F1 return Integer is
+    Var : Arr;
+  begin
+    return F (Var(Var'First(1)));
+  end;
+
+  function F2 return Integer is
+  begin
+    return F1;
+  end;
+
+end Uninit_Array;

gcc/testsuite/gnat.dg/uninit_array.ads

@@ -0,0 +1,5 @@
+package Uninit_Array is
+
+  function F2 return Integer;
+
+end Uninit_Array;

gcc/testsuite/gnat.dg/uninit_array_pkg.ads

@@ -0,0 +1,11 @@
+package Uninit_Array_Pkg Is
+
+  type Rec is record
+    B1, B2, B3, B4: Boolean;
+  end record;
+
+  type Arr is array (Boolean) of Rec;
+
+  function F (R : Rec) return Integer;
+
+end Uninit_Array_Pkg;