PR ada/46192

	* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: In the case of a
	renaming, preserve the volatileness through the indirection, if any.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@183365 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index 1960e1a..a961439 100644 (file)
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,9 @@
+2012-01-21  Eric Botcazou  <ebotcazou@adacore.com>
+
+       PR ada/46192
+       * gcc-interface/decl.c (gnat_to_gnu_entity) <object>: In the case of a
+       renaming, preserve the volatileness through the indirection, if any.
+
 2012-01-14  Andreas Schwab  <schwab@linux-m68k.org>
 
        * gcc-interface/Makefile.in (OSCONS_EXTRACT): Add

diff --git a/gcc/ada/gcc-interface/decl.c b/gcc/ada/gcc-interface/decl.c
index 89a6a2e..9d81ade 100644 (file)
--- a/gcc/ada/gcc-interface/decl.c
+++ b/gcc/ada/gcc-interface/decl.c
@@ -1051,6 +1051,14 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition)
                   entity is always accessed indirectly through it.  */
                else
                  {
+                   /* We need to preserve the volatileness of the renamed
+                      object through the indirection.  */
+                   if (TREE_THIS_VOLATILE (gnu_expr)
+                       && !TYPE_VOLATILE (gnu_type))
+                     gnu_type
+                       = build_qualified_type (gnu_type,
+                                               (TYPE_QUALS (gnu_type)
+                                                | TYPE_QUAL_VOLATILE));
                    gnu_type = build_reference_type (gnu_type);
                    inner_const_flag = TREE_READONLY (gnu_expr);
                    const_flag = true;

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index dee0f80..7d3d095 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2012-01-21  Eric Botcazou  <ebotcazou@adacore.com>
+
+       * gnat.dg/renaming5.ad[sb]: New test.
+
 2012-01-20  Jason Merrill  <jason@redhat.com>
 
        PR c++/51919

diff --git a/gcc/testsuite/gnat.dg/renaming5.adb b/gcc/testsuite/gnat.dg/renaming5.adb
new file mode 100644 (file)
index 0000000..25374fe
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/renaming5.adb
@@ -0,0 +1,30 @@
+-- PR ada/46192
+-- Testcase by Rolf Ebert <rolf.ebert.gcc@gmx.de>
+
+-- { dg-do compile }
+-- { dg-options "-O2 -fdump-tree-optimized" }
+
+with System; use System;
+
+package body Renaming5 is
+
+   type Bits_In_Byte is array (0 .. 7) of Boolean;
+   pragma Pack (Bits_In_Byte);
+
+   A : Bits_In_Byte;
+   for A'Address use System'To_Address(16#c0#);
+   pragma Volatile (A);
+
+   B : Bits_In_Byte renames A;
+
+   procedure Proc is
+   begin
+      while B (0) = False loop
+         null;
+      end loop;
+   end;
+
+end Renaming5;
+
+-- { dg-final { scan-tree-dump-times "goto" 2 "optimized" } }
+-- { dg-final { cleanup-tree-dump "optimized" } }

diff --git a/gcc/testsuite/gnat.dg/renaming5.ads b/gcc/testsuite/gnat.dg/renaming5.ads
new file mode 100644 (file)
index 0000000..2b39663
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/renaming5.ads
@@ -0,0 +1,5 @@
+package Renaming5 is
+
+   procedure Proc;
+
+end Renaming5;