Fix map space explosion from changing the arguments and caller properties on native functions.

src/accessors.cc

 // Copyright 2011 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 581 matching lines @@
 
 
 MaybeObject* Accessors::FunctionGetArguments(Object* object, void*) {
   Isolate* isolate = Isolate::Current();
   HandleScope scope(isolate);
   bool found_it = false;
   JSFunction* holder = FindInPrototypeChain<JSFunction>(object, &found_it);
   if (!found_it) return isolate->heap()->undefined_value();
   Handle<JSFunction> function(holder, isolate);
 
+  if (function->shared()->native()) return isolate->heap()->null_value();
   // Find the top invocation of the function by traversing frames.
   List<JSFunction*> functions(2);
   for (JavaScriptFrameIterator it(isolate); !it.done(); it.Advance()) {
     JavaScriptFrame* frame = it.frame();
     frame->GetFunctions(&functions);
     for (int i = functions.length() - 1; i >= 0; i--) {
       // Skip all frames that aren't invocations of the given function.
       if (functions[i] != *function) continue;
 
       if (i > 0) {
@@ skipping 113 matching lines @@
 };
 
 
 MaybeObject* Accessors::FunctionGetCaller(Object* object, void*) {
   Isolate* isolate = Isolate::Current();
   HandleScope scope(isolate);
   AssertNoAllocation no_alloc;
   bool found_it = false;
   JSFunction* holder = FindInPrototypeChain<JSFunction>(object, &found_it);
   if (!found_it) return isolate->heap()->undefined_value();
+  if (holder->shared()->native()) return isolate->heap()->null_value();
   Handle<JSFunction> function(holder, isolate);
 
   FrameFunctionIterator it(isolate, no_alloc);
 
   // Find the function from the frames.
   if (!it.Find(*function)) {
     // No frame corresponding to the given function found. Return null.
     return isolate->heap()->null_value();
   }
 
@@ skipping 47 matching lines @@
 }
 
 
 const AccessorDescriptor Accessors::ObjectPrototype = {
   ObjectGetPrototype,
   ObjectSetPrototype,
   0
 };
 
 } }  // namespace v8::internal