--- a/src/share/vm/runtime/frame.cpp	Tue Jul 30 13:03:28 2013 -0700
+++ b/src/share/vm/runtime/frame.cpp	Wed Jul 31 11:00:54 2013 +0200
@@ -221,9 +221,20 @@
 
 
 bool frame::entry_frame_is_first() const {
-  return entry_frame_call_wrapper()->anchor()->last_Java_sp() == NULL;
+  return entry_frame_call_wrapper()->is_first_frame();
 }
 
+JavaCallWrapper* frame::entry_frame_call_wrapper_if_safe(JavaThread* thread) const {
+  JavaCallWrapper** jcw = entry_frame_call_wrapper_addr();
+  address addr = (address) jcw;
+
+  // addr must be within the usable part of the stack
+  if (thread->is_in_usable_stack(addr)) {
+    return *jcw;
+  }
+
+  return NULL;
+}
 
 bool frame::should_be_deoptimized() const {
   if (_deopt_state == is_deoptimized ||
@@ -387,7 +398,6 @@
 Method* frame::interpreter_frame_method() const {
   assert(is_interpreted_frame(), "interpreted frame expected");
   Method* m = *interpreter_frame_method_addr();
-  assert(m->is_metadata(), "bad Method* in interpreter frame");
   assert(m->is_method(), "not a Method*");
   return m;
 }
@@ -713,7 +723,8 @@
       Method* m = ((nmethod *)_cb)->method();
       if (m != NULL) {
         m->name_and_sig_as_C_string(buf, buflen);
-        st->print("J  %s", buf);
+        st->print("J  %s @ " PTR_FORMAT " [" PTR_FORMAT "+" SIZE_FORMAT "]",
+                  buf, _pc, _cb->code_begin(), _pc - _cb->code_begin());
       } else {
         st->print("J  " PTR_FORMAT, pc());
       }