From patchwork Mon Aug  2 13:40:28 2010
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Subject: [Ada] Don't generate RTL in gigi
Date: Mon, 02 Aug 2010 03:40:28 -0000
From: Eric Botcazou <ebotcazou@adacore.com>
X-Patchwork-Id: 60535
Message-Id: <201008021540.28908.ebotcazou@adacore.com>
To: gcc-patches@gcc.gnu.org
Cc: Steven Bosscher <stevenb.gcc@gmail.com>

This eliminates the (presumably) last bits of RTL generation in gigi.

Tested on x86-64-suse-linux.  Steven, let me know if I've forgotten something.


2010-08-02  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c: Do not undefine N_GCC_FRONTEND and do not
	include expr.h.
	(gnat_to_gnu_entity) <object>: Force address of -1 at the tree level
	for the debug-only entity.
	* gcc-interface/Make-lang.in (ada/decl.o): Adjust dependencies.


Index: gcc-interface/decl.c
===================================================================
--- gcc-interface/decl.c	(revision 162622)
+++ gcc-interface/decl.c	(working copy)
@@ -23,10 +23,6 @@
  *                                                                          *
  ****************************************************************************/
 
-/* FIXME: Still need to include rtl.h here (via expr.h) because this file
-   actually generates RTL (search for gen_rtx_* in gnat_to_gnu_entity).  */
-#undef IN_GCC_FRONTEND
-
 #include "config.h"
 #include "system.h"
 #include "coretypes.h"
@@ -36,7 +32,6 @@
 #include "toplev.h"
 #include "ggc.h"
 #include "target.h"
-#include "expr.h"
 #include "tree-inline.h"
 
 #include "ada.h"
@@ -600,18 +595,18 @@ gnat_to_gnu_entity (Entity_Id gnat_entit
 	    && DECL_NAME (TYPE_NAME (gnu_type)) == exception_data_name_id)
 	  gnu_type = except_type_node;
 
-	/* For a debug renaming declaration, build a pure debug entity.  */
+	/* For a debug renaming declaration, build a debug-only entity.  */
 	if (Present (Debug_Renaming_Link (gnat_entity)))
 	  {
-	    rtx addr;
+	    /* Force a non-null value to make sure the symbol is retained.  */
+	    tree value = build1 (INDIRECT_REF, gnu_type,
+				 build1 (NOP_EXPR,
+					 build_pointer_type (gnu_type),
+					 integer_minus_one_node));
 	    gnu_decl = build_decl (input_location,
 				   VAR_DECL, gnu_entity_name, gnu_type);
-	    /* The (MEM (CONST (0))) pattern is prescribed by STABS.  */
-	    if (global_bindings_p ())
-	      addr = gen_rtx_CONST (VOIDmode, const0_rtx);
-	    else
-	      addr = stack_pointer_rtx;
-	    SET_DECL_RTL (gnu_decl, gen_rtx_MEM (Pmode, addr));
+	    SET_DECL_VALUE_EXPR (gnu_decl, value);
+	    DECL_HAS_VALUE_EXPR_P (gnu_decl) = 1;
 	    gnat_pushdecl (gnu_decl, gnat_entity);
 	    break;
 	  }
Index: gcc-interface/Make-lang.in
===================================================================
--- gcc-interface/Make-lang.in	(revision 162622)
+++ gcc-interface/Make-lang.in	(working copy)
@@ -1235,8 +1235,8 @@ ada/cuintp.o : ada/gcc-interface/cuintp.
 	$(COMPILER) -c $(ALL_COMPILERFLAGS) -I.. $(ALL_CPPFLAGS) $< -o $@
 
 ada/decl.o : ada/gcc-interface/decl.c $(CONFIG_H) $(SYSTEM_H) coretypes.h \
-   $(TM_H) $(TREE_H) $(FLAGS_H) toplev.h $(TARGET_H) $(EXPR_H) \
-   $(TREE_INLINE_H) ada/gcc-interface/ada.h ada/types.h ada/atree.h \
+   $(TM_H) $(TREE_H) $(FLAGS_H) toplev.h $(TARGET_H) $(TREE_INLINE_H) \
+   ada/gcc-interface/ada.h ada/types.h ada/atree.h \
    ada/elists.h ada/namet.h ada/nlists.h ada/repinfo.h ada/snames.h \
    ada/stringt.h ada/uintp.h ada/fe.h ada/sinfo.h ada/einfo.h $(ADA_TREE_H) \
    ada/gcc-interface/gigi.h gt-ada-decl.h