re PR rtl-optimization/45621 (ICE: verify_cgraph_node failed: inlined_to pointer is set but no predecessors found with -fipa-cp-clone -flto)

PR middle-end/45621
	* g++.dg/lto/pr45621.h : New.
	* g++.dg/lto/pr45621_0.C: New.
	* g++.dg/lto/pr45621_1.C: New.
	* cgraph.c (cgraph_update_edges_for_call_stmt_node): When new call is
	redirected to clone, be happy.
	* cgraph.h (cgraph node): Enable former_clone_of unconditinally.
	* cgraphunit.c (verify_cgraph_node, cgraph_materialize_clone): Handle
	former_clone_of unconditinally.

From-SVN: r165492

gcc/ChangeLog

@@ -1,3 +1,12 @@
+2010-10-14  Jan Hubicka  <jh@suse.cz>
+
+	PR middle-end/45621
+	* cgraph.c (cgraph_update_edges_for_call_stmt_node): When new call is
+	redirected to clone, be happy.
+	* cgraph.h (cgraph node): Enable former_clone_of unconditinally.
+	* cgraphunit.c (verify_cgraph_node, cgraph_materialize_clone): Handle
+	former_clone_of unconditinally.
+	
 2010-10-14  Iain Sandoe  <iains@gcc.gnu.org>
 
 	merge from FSF apple 'trunk' branch. 

gcc/cgraph.c

@@ -1241,9 +1241,18 @@ cgraph_update_edges_for_call_stmt_node (struct cgraph_node *node,
 	{
 	  /* See if the edge is already there and has the correct callee.  It
 	     might be so because of indirect inlining has already updated
-	     it.  */
-	  if (new_call && e->callee && e->callee->decl == new_call)
-	    return;
+	     it.  We also might've cloned and redirected the edge.  */
+	  if (new_call && e->callee)
+	    {
+	      struct cgraph_node *callee = e->callee;
+	      while (callee)
+		{
+		  if (callee->decl == new_call
+		      || callee->former_clone_of == new_call)
+		    return;
+		  callee = callee->clone_of;
+		}
+	    }
 
 	  /* Otherwise remove edge and create new one; we can't simply redirect
 	     since function has changed, so inline plan and other information

gcc/cgraph.h

@@ -227,11 +227,8 @@ struct GTY((chain_next ("%h.next"), chain_prev ("%h.previous"))) cgraph_node {
   /* For functions with many calls sites it holds map from call expression
      to the edge to speed up cgraph_edge function.  */
   htab_t GTY((param_is (struct cgraph_edge))) call_site_hash;
-#ifdef ENABLE_CHECKING
-  /* Declaration node used to be clone of.  Used for checking only. 
-     We must skip it or we get references from release checking GGC files. */
-  tree GTY ((skip)) former_clone_of;
-#endif
+  /* Declaration node used to be clone of. */
+  tree former_clone_of;
 
   PTR GTY ((skip)) aux;
 

gcc/cgraphunit.c

@@ -656,7 +656,6 @@ verify_cgraph_node (struct cgraph_node *node)
 				debug_tree (e->callee->decl);
 				error_found = true;
 			      }
-#ifdef ENABLE_CHECKING
 			    else if (!e->callee->global.inlined_to
 				     && decl
 				     && cgraph_get_node (decl)
@@ -671,7 +670,6 @@ verify_cgraph_node (struct cgraph_node *node)
 				debug_tree (decl);
 				error_found = true;
 			      }
-#endif
 			  }
 			else if (decl)
 			  {
@@ -2079,11 +2077,9 @@ static void
 cgraph_materialize_clone (struct cgraph_node *node)
 {
   bitmap_obstack_initialize (NULL);
-#ifdef ENABLE_CHECKING
   node->former_clone_of = node->clone_of->decl;
   if (node->clone_of->former_clone_of)
     node->former_clone_of = node->clone_of->former_clone_of;
-#endif
   /* Copy the OLD_VERSION_NODE function tree to the new version.  */
   tree_function_versioning (node->clone_of->decl, node->decl,
   			    node->clone.tree_map, true,

gcc/testsuite/ChangeLog

@@ -1,3 +1,10 @@
+2010-10-14  Jan Hubicka  <jh@suse.cz>
+
+	PR middle-end/45621
+	* g++.dg/lto/pr45621.h : New.
+	* g++.dg/lto/pr45621_0.C: New.
+	* g++.dg/lto/pr45621_1.C: New.
+
 2010-10-14  Iain Sandoe  <iains@gcc.gnu.org>
 
 	* objc.dg/property: New.

gcc/testsuite/g++.dg/lto/pr45621.h

@@ -0,0 +1,8 @@
+struct S
+{
+  void m ();
+  virtual void v1 ();
+  virtual void v2 ();
+};
+
+extern S s;

gcc/testsuite/g++.dg/lto/pr45621_0.C

@@ -0,0 +1,10 @@
+// { dg-lto-do assemble }
+// { dg-extra-ld-options "-O2 -fipa-cp-clone -flto -nostdlib -r" }
+#include "pr45621.h"
+
+void
+foo ()
+{
+  s.v1 ();
+  s.m ();
+}

gcc/testsuite/g++.dg/lto/pr45621_1.C

@@ -0,0 +1,13 @@
+#include "pr45621.h"
+
+void
+S::v1 ()
+{
+  v2 ();
+}
+
+void
+S::m ()
+{
+  v1 ();
+}