Don't return frame by reference in ProcessTopOptimizedFrame.

src/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2163 matching lines @@
     isolate()->global_handles()->IterateObjectGroups(
         visitor, &IsUnmarkedHeapObjectWithHeap);
     MarkImplicitRefGroups();
     ProcessWeakMaps();
     work_to_do = !marking_deque_.IsEmpty();
     ProcessMarkingDeque();
   }
 }
 
 
-static StackFrame* TopOptimizedFrame(Isolate* isolate) {
-  for (StackFrameIterator it(isolate, isolate->thread_local_top());
-       !it.done(); it.Advance()) {
-    if (it.frame()->type() == StackFrame::JAVA_SCRIPT) {
-      return NULL;
-    }
-    if (it.frame()->type() == StackFrame::OPTIMIZED) {
-      return it.frame();
-    }
-  }
-  return NULL;
-}
-
-
 void MarkCompactCollector::ProcessTopOptimizedFrame(ObjectVisitor* visitor) {
-  StackFrame* frame = TopOptimizedFrame(isolate());
-  if (frame != NULL) {
-    Code* code = frame->LookupCode();
-    if (!code->CanDeoptAt(frame->pc())) {
-      code->CodeIterateBody(visitor);
+  for (StackFrameIterator it(isolate(), isolate()->thread_local_top());
+       !it.done(); it.Advance()) {
+    if (it.frame()->type() == StackFrame::JAVA_SCRIPT) {
+      return;
     }
-    ProcessMarkingDeque();
+    if (it.frame()->type() == StackFrame::OPTIMIZED) {
+      Code* code = it.frame()->LookupCode();
+      if (!code->CanDeoptAt(it.frame()->pc())) {
+        code->CodeIterateBody(visitor);
+      }
+      ProcessMarkingDeque();
+      return;
+    }
   }
 }
 
 
 void MarkCompactCollector::MarkLiveObjects() {
   GCTracer::Scope gc_scope(tracer_, GCTracer::Scope::MC_MARK);
   // The recursive GC marker detects when it is nearing stack overflow,
   // and switches to a different marking system.  JS interrupts interfere
   // with the C stack limit check.
   PostponeInterruptsScope postpone(isolate());
@@ skipping 2098 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal