Do not eagerly instantiate accessors' JSFunction.

src/arguments.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_ARGUMENTS_H_
 #define V8_ARGUMENTS_H_
 
 #include "src/allocation.h"
 #include "src/isolate.h"
 
@@ skipping 202 matching lines @@
   typedef CustomArguments<T> Super;
   static const int kArgsLength = T::kArgsLength;
   static const int kHolderIndex = T::kHolderIndex;
   static const int kDataIndex = T::kDataIndex;
   static const int kReturnValueDefaultValueIndex =
       T::kReturnValueDefaultValueIndex;
   static const int kIsolateIndex = T::kIsolateIndex;
   static const int kCalleeIndex = T::kCalleeIndex;
   static const int kContextSaveIndex = T::kContextSaveIndex;
 
-  FunctionCallbackArguments(internal::Isolate* isolate,
-      internal::Object* data,
-      internal::JSFunction* callee,
-      internal::Object* holder,
-      internal::Object** argv,
-      int argc,
-      bool is_construct_call)
-        : Super(isolate),
-          argv_(argv),
-          argc_(argc),
-          is_construct_call_(is_construct_call) {
+  FunctionCallbackArguments(internal::Isolate* isolate, internal::Object* data,
+                            internal::HeapObject* callee,
+                            internal::Object* holder, internal::Object** argv,
+                            int argc, bool is_construct_call)
+      : Super(isolate),
+        argv_(argv),
+        argc_(argc),
+        is_construct_call_(is_construct_call) {
     Object** values = begin();
     values[T::kDataIndex] = data;
     values[T::kCalleeIndex] = callee;
     values[T::kHolderIndex] = holder;
     values[T::kContextSaveIndex] = isolate->heap()->the_hole_value();
     values[T::kIsolateIndex] = reinterpret_cast<internal::Object*>(isolate);
     // Here the hole is set as default value.
     // It cannot escape into js as it's remove in Call below.
     values[T::kReturnValueDefaultValueIndex] =
         isolate->heap()->the_hole_value();
     values[T::kReturnValueIndex] = isolate->heap()->the_hole_value();
-    DCHECK(values[T::kCalleeIndex]->IsJSFunction());
+    DCHECK(values[T::kCalleeIndex]->IsJSFunction() ||
+           values[T::kCalleeIndex]->IsFunctionTemplateInfo());
     DCHECK(values[T::kHolderIndex]->IsHeapObject());
     DCHECK(values[T::kIsolateIndex]->IsSmi());
   }
 
   /*
    * The following Call function wraps the calling of all callbacks to handle
    * calling either the old or the new style callbacks depending on which one
    * has been registered.
    * For old callbacks which return an empty handle, the ReturnValue is checked
    * and used if it's been set to anything inside the callback.
@@ skipping 46 matching lines @@
 #define RUNTIME_FUNCTION(Name) RUNTIME_FUNCTION_RETURNS_TYPE(Object*, Name)
 #define RUNTIME_FUNCTION_RETURN_PAIR(Name) \
     RUNTIME_FUNCTION_RETURNS_TYPE(ObjectPair, Name)
 #define RUNTIME_FUNCTION_RETURN_TRIPLE(Name) \
     RUNTIME_FUNCTION_RETURNS_TYPE(ObjectTriple, Name)
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARGUMENTS_H_