re PR lto/47497 (SPEC CPU 2006 failed to link with LTO -fuse-linker-plugin -fwhole-program)

	PR lto/47497
	* lto-symtab.c (lto_cgraph_replace_node): Do not set thunk.alias.
	(lto_symtab_merge_cgraph_nodes_1): Update thunk.alias pointers here.
	* cgraph.h (cgraph_same_body_alias, cgraph_add_thunk): Add node pointers.
	* cgraph.c (cgraph_same_body_alias_1, cgraph_same_body_alias,
	cgraph_add_thunk): Add node pointers.
	* lto-cgraph.c (lto_output_node): Verify that thunks&aliases are
	associated to right node.
	(input_node): Update use of cgraph_same_body_alias
	and cgraph_add_thunk.

	* optimize.c (maybe_clone_body): Update call of cgraph_same_body_alias
	and cgraph_add_thunk.
	* method.c (make_alias_for_thunk, use_thunk): Likewise.
	* mangle.c (mangle_decl): Likewise.

From-SVN: r170682

gcc/ChangeLog

+2011-03-04  Jan Hubicka  <jh@suse.cz>
+
+	PR lto/47497
+	* lto-symtab.c (lto_cgraph_replace_node): Do not set thunk.alias.
+	(lto_symtab_merge_cgraph_nodes_1): Update thunk.alias pointers here.
+	* cgraph.h (cgraph_same_body_alias, cgraph_add_thunk): Add node pointers.
+	* cgraph.c (cgraph_same_body_alias_1, cgraph_same_body_alias,
+	cgraph_add_thunk): Add node pointers.
+	* lto-cgraph.c (lto_output_node): Verify that thunks&aliases are
+	associated to right node.
+	(input_node): Update use of cgraph_same_body_alias
+	and cgraph_add_thunk.
+
 2011-03-04  Changpeng Fang  <changpeng.fang@amd.com>
 
 	* config/i386/i386.opt (mprefer-avx128): New flag.

gcc/cgraph.c

@@ -536,16 +536,16 @@ cgraph_node (tree decl)
   return node;
 }
 
-/* Mark ALIAS as an alias to DECL.  */
+/* Mark ALIAS as an alias to DECL.  DECL_NODE is cgraph node representing
+   the function body is associated with (not neccesarily cgraph_node (DECL).  */
 
 static struct cgraph_node *
-cgraph_same_body_alias_1 (tree alias, tree decl)
+cgraph_same_body_alias_1 (struct cgraph_node *decl_node, tree alias, tree decl)
 {
-  struct cgraph_node key, *alias_node, *decl_node, **slot;
+  struct cgraph_node key, *alias_node, **slot;
 
   gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
   gcc_assert (TREE_CODE (alias) == FUNCTION_DECL);
-  decl_node = cgraph_node (decl);
 
   key.decl = alias;
 
@@ -575,7 +575,7 @@ cgraph_same_body_alias_1 (tree alias, tree decl)
    and cgraph_node (ALIAS) transparently returns cgraph_node (DECL).   */
 
 struct cgraph_node *
-cgraph_same_body_alias (tree alias, tree decl)
+cgraph_same_body_alias (struct cgraph_node *decl_node, tree alias, tree decl)
 {
 #ifndef ASM_OUTPUT_DEF
   /* If aliases aren't supported by the assembler, fail.  */
@@ -584,7 +584,7 @@ cgraph_same_body_alias (tree alias, tree decl)
 
   /*gcc_assert (!assembler_name_hash);*/
 
-  return cgraph_same_body_alias_1 (alias, decl);
+  return cgraph_same_body_alias_1 (decl_node, alias, decl);
 }
 
 /* Add thunk alias into callgraph.  The alias declaration is ALIAS and it
@@ -592,7 +592,8 @@ cgraph_same_body_alias (tree alias, tree decl)
    See comments in thunk_adjust for detail on the parameters.  */
 
 struct cgraph_node *
-cgraph_add_thunk (tree alias, tree decl, bool this_adjusting,
+cgraph_add_thunk (struct cgraph_node *decl_node, tree alias, tree decl,
+		  bool this_adjusting,
 		  HOST_WIDE_INT fixed_offset, HOST_WIDE_INT virtual_value,
 		  tree virtual_offset,
 		  tree real_alias)
@@ -606,7 +607,7 @@ cgraph_add_thunk (tree alias, tree decl, bool this_adjusting,
       cgraph_remove_node (node);
     }
   
-  node = cgraph_same_body_alias_1 (alias, decl);
+  node = cgraph_same_body_alias_1 (decl_node, alias, decl);
   gcc_assert (node);
   gcc_checking_assert (!virtual_offset
 		       || tree_int_cst_equal (virtual_offset,
@@ -2722,7 +2723,7 @@ cgraph_propagate_frequency (struct cgraph_node *node)
 	case NODE_FREQUENCY_EXECUTED_ONCE:
 	  if (dump_file && (dump_flags & TDF_DETAILS))
 	    fprintf (dump_file, "  Called by %s that is executed once\n",
-		     cgraph_node_name (node));
+		     cgraph_node_name (edge->caller));
 	  maybe_unlikely_executed = false;
 	  if (edge->loop_nest)
 	    {
@@ -2735,7 +2736,7 @@ cgraph_propagate_frequency (struct cgraph_node *node)
 	case NODE_FREQUENCY_NORMAL:
 	  if (dump_file && (dump_flags & TDF_DETAILS))
 	    fprintf (dump_file, "  Called by %s that is normal or hot\n",
-		     cgraph_node_name (node));
+		     cgraph_node_name (edge->caller));
 	  maybe_unlikely_executed = false;
 	  maybe_executed_once = false;
 	  break;

gcc/cgraph.h

@@ -559,8 +559,8 @@ struct cgraph_indirect_call_info *cgraph_allocate_init_indirect_info (void);
 struct cgraph_node * cgraph_get_node (const_tree);
 struct cgraph_node * cgraph_get_node_or_alias (const_tree);
 struct cgraph_node * cgraph_node (tree);
-struct cgraph_node * cgraph_same_body_alias (tree, tree);
-struct cgraph_node * cgraph_add_thunk (tree, tree, bool, HOST_WIDE_INT,
+struct cgraph_node * cgraph_same_body_alias (struct cgraph_node *, tree, tree);
+struct cgraph_node * cgraph_add_thunk (struct cgraph_node *, tree, tree, bool, HOST_WIDE_INT,
 				       HOST_WIDE_INT, tree, tree);
 void cgraph_remove_same_body_alias (struct cgraph_node *);
 struct cgraph_node *cgraph_node_for_asm (tree);

gcc/cp/ChangeLog

+2011-03-04  Jan Hubicka  <jh@suse.cz>
+
+	PR lto/47497
+	* optimize.c (maybe_clone_body): Update call of cgraph_same_body_alias
+	and cgraph_add_thunk.
+	* method.c (make_alias_for_thunk, use_thunk): Likewise.
+	* mangle.c (mangle_decl): Likewise.
+
 2011-03-04  Jason Merrill  <jason@redhat.com>
 
 	PR c++/47971

gcc/cp/mangle.c

@@ -3163,7 +3163,7 @@ mangle_decl (const tree decl)
       if (vague_linkage_p (decl))
 	DECL_WEAK (alias) = 1;
       if (TREE_CODE (decl) == FUNCTION_DECL)
-	cgraph_same_body_alias (alias, decl);
+	cgraph_same_body_alias (cgraph_node (decl), alias, decl);
       else
 	varpool_extra_name_alias (alias, decl);
 #endif

gcc/cp/method.c

@@ -259,7 +259,8 @@ make_alias_for_thunk (tree function)
 
   if (!flag_syntax_only)
     {
-      struct cgraph_node *aliasn = cgraph_same_body_alias (alias, function);
+      struct cgraph_node *aliasn = cgraph_same_body_alias (cgraph_node (function),
+							   alias, function);
       DECL_ASSEMBLER_NAME (function);
       gcc_assert (aliasn != NULL);
     }
@@ -376,7 +377,7 @@ use_thunk (tree thunk_fndecl, bool emit_p)
   a = nreverse (t);
   DECL_ARGUMENTS (thunk_fndecl) = a;
   TREE_ASM_WRITTEN (thunk_fndecl) = 1;
-  cgraph_add_thunk (thunk_fndecl, function,
+  cgraph_add_thunk (cgraph_node (function), thunk_fndecl, function,
 		    this_adjusting, fixed_offset, virtual_value,
 		    virtual_offset, alias);
 

gcc/cp/optimize.c

@@ -309,7 +309,7 @@ maybe_clone_body (tree fn)
 	  && (!DECL_ONE_ONLY (fns[0])
 	      || (HAVE_COMDAT_GROUP
 		  && DECL_WEAK (fns[0])))
-	  && cgraph_same_body_alias (clone, fns[0]))
+	  && cgraph_same_body_alias (cgraph_node (fns[0]), clone, fns[0]))
 	{
 	  alias = true;
 	  if (DECL_ONE_ONLY (fns[0]))

gcc/lto-cgraph.c

@@ -551,6 +551,7 @@ lto_output_node (struct lto_simple_output_block *ob, struct cgraph_node *node,
 	      lto_output_fn_decl_index (ob->decl_state, ob->main_stream,
 					alias->thunk.alias);
 	    }
+	  gcc_assert (cgraph_get_node (alias->thunk.alias) == node);
 	  lto_output_uleb128_stream (ob->main_stream, alias->resolution);
 	  alias = alias->previous;
 	}
@@ -1094,7 +1095,7 @@ input_node (struct lto_file_decl_data *file_data,
 	  tree real_alias;
 	  decl_index = lto_input_uleb128 (ib);
 	  real_alias = lto_file_decl_data_get_fn_decl (file_data, decl_index);
-	  alias = cgraph_same_body_alias (alias_decl, real_alias);
+	  alias = cgraph_same_body_alias (node, alias_decl, real_alias);
 	}
       else
         {
@@ -1103,12 +1104,13 @@ input_node (struct lto_file_decl_data *file_data,
 	  tree real_alias;
 	  decl_index = lto_input_uleb128 (ib);
 	  real_alias = lto_file_decl_data_get_fn_decl (file_data, decl_index);
-	  alias = cgraph_add_thunk (alias_decl, fn_decl, type & 2, fixed_offset,
+	  alias = cgraph_add_thunk (node, alias_decl, fn_decl, type & 2, fixed_offset,
 				    virtual_value,
 				    (type & 4) ? size_int (virtual_value) : NULL_TREE,
 				    real_alias);
 	}
-       alias->resolution = (enum ld_plugin_symbol_resolution)lto_input_uleb128 (ib);
+      gcc_assert (alias);
+      alias->resolution = (enum ld_plugin_symbol_resolution)lto_input_uleb128 (ib);
     }
   return node;
 }

gcc/lto-symtab.c

@@ -273,7 +273,6 @@ lto_cgraph_replace_node (struct cgraph_node *node,
 	  last = alias;
 	  gcc_assert (alias->same_body_alias);
 	  alias->same_body = prevailing_node;
-	  alias->thunk.alias = prevailing_node->decl;
 	}
       last->next = prevailing_node->same_body;
       /* Node with aliases is prevailed by alias.
@@ -828,8 +827,16 @@ lto_symtab_merge_cgraph_nodes_1 (void **slot, void *data ATTRIBUTE_UNUSED)
 void
 lto_symtab_merge_cgraph_nodes (void)
 {
+  struct cgraph_node *node, *alias, *next;
   lto_symtab_maybe_init_hash_table ();
   htab_traverse (lto_symtab_identifiers, lto_symtab_merge_cgraph_nodes_1, NULL);
+
+  for (node = cgraph_nodes; node; node = node->next)
+    for (alias = node->same_body; alias; alias = next)
+      {
+	next = alias->next;
+	alias->thunk.alias = lto_symtab_prevailing_decl (alias->thunk.alias);
+      }
 }
 
 /* Given the decl DECL, return the prevailing decl with the same name. */