7132180: JSR 292: C1 JVM crash with ClassValue/MethodHandle

Reviewed-by: never

src/share/vm/c1/c1_GraphBuilder.cpp

 /*
- * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -3683,8 +3683,12 @@ bool GraphBuilder::for_method_handle_inline(ciMethod* callee) {
       // Get the two MethodHandle inputs from the Phi.
       Value op1 = phi->operand_at(0);
       Value op2 = phi->operand_at(1);
-      ciMethodHandle* mh1 = op1->type()->as_ObjectType()->constant_value()->as_method_handle();
-      ciMethodHandle* mh2 = op2->type()->as_ObjectType()->constant_value()->as_method_handle();
+      ObjectType* op1type = op1->type()->as_ObjectType();
+      ObjectType* op2type = op2->type()->as_ObjectType();
+
+      if (op1type->is_constant() && op2type->is_constant()) {
+        ciMethodHandle* mh1 = op1type->constant_value()->as_method_handle();
+        ciMethodHandle* mh2 = op2type->constant_value()->as_method_handle();
 
         // Set the callee to have access to the class and signature in
         // the MethodHandleCompiler.
@@ -3736,6 +3740,7 @@ bool GraphBuilder::for_method_handle_inline(ciMethod* callee) {
         }
       }
     }
+  }
   return false;
 }