re PR debug/48354 (internal compiler error: in splice_child_die, at dwarf2out.c:8064)

2011-12-13  Richard Guenther  <rguenther@suse.de>

	PR lto/48354
	* tree.c (find_decls_types_r): Also walk DECL_ORIGINAL_TYPE.
	* tree-streamer-in.c (lto_input_ts_decl_non_common_tree_pointers):
	Stream DECL_ORIGINAL_TYPE.
	* tree-streamer-out.c (write_ts_decl_non_common_tree_pointers):
	Likewise.

	lto/
	* lto.c (lto_ft_decl_non_common): When we merged DECL_ORIGINAL_TYPE
	with the type of the TYPE_DECL clear DECL_ORIGINAL_TYPE.

	* g++.dg/lto/pr48354-1_0.C: New testcase.

From-SVN: r182286

gcc/ChangeLog

+2011-12-13  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/48354
+	* tree.c (find_decls_types_r): Also walk DECL_ORIGINAL_TYPE.
+	* tree-streamer-in.c (lto_input_ts_decl_non_common_tree_pointers):
+	Stream DECL_ORIGINAL_TYPE.
+	* tree-streamer-out.c (write_ts_decl_non_common_tree_pointers):
+	Likewise.
+
 2011-12-13  Jakub Jelinek  <jakub@redhat.com>
 
 	Revert

gcc/lto/ChangeLog

+2011-12-13  Richard Guenther  <rguenther@suse.de>
+
+	PR lto/48354
+	* lto.c (lto_ft_decl_non_common): When we merged DECL_ORIGINAL_TYPE
+	with the type of the TYPE_DECL clear DECL_ORIGINAL_TYPE.
+
 2011-12-01  Uros Bizjak  <ubizjak@gmail.com>
 
 	* lto-lang.c (lto_attribute_table): Handle *tm regparm.

gcc/lto/lto.c

@@ -381,6 +381,13 @@ lto_ft_decl_non_common (tree t)
   LTO_FIXUP_TREE (DECL_ARGUMENT_FLD (t));
   LTO_FIXUP_TREE (DECL_RESULT_FLD (t));
   LTO_FIXUP_TREE (DECL_VINDEX (t));
+  /* The C frontends may create exact duplicates for DECL_ORIGINAL_TYPE
+     like for 'typedef enum foo foo'.  We have no way of avoiding to
+     merge them and dwarf2out.c cannot deal with this,
+     so fix this up by clearing DECL_ORIGINAL_TYPE in this case.  */
+  if (TREE_CODE (t) == TYPE_DECL
+      && DECL_ORIGINAL_TYPE (t) == TREE_TYPE (t))
+    DECL_ORIGINAL_TYPE (t) = NULL_TREE;
 }
 
 /* Fix up fields of a decl_non_common T.  */

gcc/testsuite/ChangeLog

 2011-12-13  Richard Guenther  <rguenther@suse.de>
 
+	PR lto/48354
+	* g++.dg/lto/pr48354-1_0.C: New testcase.
+
+2011-12-13  Richard Guenther  <rguenther@suse.de>
+
 	PR tree-optimization/51519
 	* gcc.dg/pr51519.c: New testcase.
 

gcc/testsuite/g++.dg/lto/pr48354-1_0.C

+// { dg-lto-do link }
+// { dg-lto-options { { -g -flto } } }
+// { dg-extra-ld-options "-r -nostdlib" }
+
+template<typename T> struct Identity { typedef T type; };
+struct S {
+    typedef void (S::*FP)();
+    FP fp;
+};
+void g();
+void f() {
+    typedef Identity<S>::type Dummy;
+    S s;
+    g();
+}
+

gcc/tree-streamer-in.c

@@ -602,6 +602,8 @@ lto_input_ts_decl_non_common_tree_pointers (struct lto_input_block *ib,
       DECL_ARGUMENTS (expr) = stream_read_tree (ib, data_in);
       DECL_RESULT (expr) = stream_read_tree (ib, data_in);
     }
+  else if (TREE_CODE (expr) == TYPE_DECL)
+    DECL_ORIGINAL_TYPE (expr) = stream_read_tree (ib, data_in);
   DECL_VINDEX (expr) = stream_read_tree (ib, data_in);
 }
 

gcc/tree-streamer-out.c

@@ -508,6 +508,8 @@ write_ts_decl_non_common_tree_pointers (struct output_block *ob, tree expr,
       stream_write_tree (ob, DECL_ARGUMENTS (expr), ref_p);
       stream_write_tree (ob, DECL_RESULT (expr), ref_p);
     }
+  else if (TREE_CODE (expr) == TYPE_DECL)
+    stream_write_tree (ob, DECL_ORIGINAL_TYPE (expr), ref_p);
   stream_write_tree (ob, DECL_VINDEX (expr), ref_p);
 }
 

gcc/tree.c

@@ -4796,6 +4796,7 @@ find_decls_types_r (tree *tp, int *ws, void *data)
 	{
 	  fld_worklist_push (DECL_ARGUMENT_FLD (t), fld);
 	  fld_worklist_push (DECL_VINDEX (t), fld);
+	  fld_worklist_push (DECL_ORIGINAL_TYPE (t), fld);
 	}
       else if (TREE_CODE (t) == FIELD_DECL)
 	{