This is the mail archive of the mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [PATCH]: Fix PR debug/19191 and dwarf-die-7.c

On Wed, 2004-12-29 at 19:25 -0800, Richard Henderson wrote:
> On Wed, Dec 29, 2004 at 03:35:57PM -0500, Daniel Berlin wrote:
> > 	* gimple-low.c (lower_bind_expr): Mark new block used if 
> > 	old block is used.
> I guess this is ok.
> r~

I withdraw this patch, as it is now causing bootstrap failures in
libstdc++ as of today.

Blocks aren't being marked as used by even if they have used variables
in them.

This can be seen with the attached patch.

I'm just going to add a final pass right after remove_useless_vars that
walks the block tree, and sets used properly on all the blocks (based on
whether they have used variables, used subblocks, etc)

Unless someone thinks this is a bad idea/there is a better approach.

Index: gimple-low.c
RCS file: /cvs/gcc/gcc/gcc/gimple-low.c,v
retrieving revision
diff -u -p -r2.12.2.1 gimple-low.c
--- gimple-low.c	12 Sep 2004 02:55:48 -0000
+++ gimple-low.c	30 Dec 2004 15:36:23 -0000
@@ -209,6 +209,19 @@ lower_stmt (tree_stmt_iterator *tsi, str
   tsi_next (tsi);
+static void
+verify_used_status (tree block)
+  if (BLOCK_VARS (block))
+    {
+      tree var;
+      for (var = BLOCK_VARS (block); var; var = TREE_CHAIN (var))
+	{
+	  if (TREE_USED (var) && !TREE_USED (block))
+	    abort ();
+	}
+    }
 /* Lowers a bind_expr TSI.  DATA is passed through the recursion.  */
 static void
@@ -233,6 +246,7 @@ lower_bind_expr (tree_stmt_iterator *tsi
 	  /* We do not expect to handle duplicate blocks.  */
 	  gcc_assert (!TREE_ASM_WRITTEN (new_block));
 	  TREE_ASM_WRITTEN (new_block) = 1;
+	  verify_used_status (new_block);
 	  /* Block tree may get clobbered by inlining.  Normally this would
 	     be fixed in rest_of_decl_compilation using block notes, but

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]