Refactor JavaScriptFrame::function() to return a JSFunction* and remove associated casts.

src/ic.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 141 matching lines @@
 Address IC::OriginalCodeAddress() const {
   HandleScope scope(isolate());
   // Compute the JavaScript frame for the frame pointer of this IC
   // structure. We need this to be able to find the function
   // corresponding to the frame.
   StackFrameIterator it(isolate());
   while (it.frame()->fp() != this->fp()) it.Advance();
   JavaScriptFrame* frame = JavaScriptFrame::cast(it.frame());
   // Find the function on the stack and both the active code for the
   // function and the original code.
-  JSFunction* function = JSFunction::cast(frame->function());
+  JSFunction* function = frame->function();
   Handle<SharedFunctionInfo> shared(function->shared(), isolate());
   Code* code = shared->code();
   ASSERT(Debug::HasDebugInfo(shared));
   Code* original_code = Debug::GetDebugInfo(shared)->original_code();
   ASSERT(original_code->IsCode());
   // Get the address of the call site in the active code. This is the
   // place where the call to DebugBreakXXX is and where the IC
   // normally would be.
   Address addr = Assembler::target_address_from_return_address(pc());
   // Return the address in the original code. This is the place where
@@ skipping 2919 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal