Our JavaScriptFrame::function_slot_object is arch independent.

src/frames-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_FRAMES_INL_H_
 #define V8_FRAMES_INL_H_
 
 #include "src/frames.h"
 #include "src/isolate.h"
 #include "src/v8memory.h"
@@ skipping 199 matching lines @@
 inline bool JavaScriptFrame::has_adapted_arguments() const {
   return IsArgumentsAdaptorFrame(caller_fp());
 }
 
 
 inline JSFunction* JavaScriptFrame::function() const {
   return JSFunction::cast(function_slot_object());
 }
 
 
+inline Object* JavaScriptFrame::function_slot_object() const {
+  const int offset = JavaScriptFrameConstants::kFunctionOffset;
+  return Memory::Object_at(fp() + offset);
+}
+
+
 inline StubFrame::StubFrame(StackFrameIteratorBase* iterator)
     : StandardFrame(iterator) {
 }
 
 
 inline OptimizedFrame::OptimizedFrame(StackFrameIteratorBase* iterator)
     : JavaScriptFrame(iterator) {
 }
 
 
@@ skipping 45 matching lines @@
 inline StackFrame* SafeStackFrameIterator::frame() const {
   DCHECK(!done());
   DCHECK(frame_->is_java_script() || frame_->is_exit());
   return frame_;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FRAMES_INL_H_