Implement Function.prototype.toMethod.

src/runtime.cc

 // 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.
 
 #include <stdlib.h>
 #include <limits>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 2032 matching lines @@
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
   Handle<Object> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result, JSObject::PreventExtensions(obj));
   return *result;
 }
 
 
+RUNTIME_FUNCTION(Runtime_ToMethod) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 2);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, fun, 0);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, home_object, 1);
+  Handle<JSFunction> clone = JSFunction::Copy(fun);

[arv (Not doing code reviews), 2014/08/20 15:35:53]

This is going to copy the properties which is not right.

+  Handle<Symbol> home_object_symbol(isolate->heap()->home_object_symbol());
+  JSObject::SetOwnPropertyIgnoreAttributes(
+      clone,
+      home_object_symbol,
+      home_object,
+      DONT_SHOW).Assert();

[Toon Verwaest, 2014/08/20 07:43:11]

DONT_ENUM.

The other flags are just there for filtering. Probably we should extract them to
a separate filter class rather than having them as part of the regular
PropertyAttributes. We don't even have enough bits to encode DONT_SHOW into the
descriptor I believe.

+  return *clone;
+}
+
+
+RUNTIME_FUNCTION(Runtime_HomeObjectSymbol) {
+  DCHECK(args.length() == 0);
+  return isolate->heap()->home_object_symbol();
+}
+
+
 RUNTIME_FUNCTION(Runtime_IsExtensible) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(JSObject, obj, 0);
   if (obj->IsJSGlobalProxy()) {
     PrototypeIterator iter(isolate, obj);
     if (iter.IsAtEnd()) return isolate->heap()->false_value();
     DCHECK(iter.GetCurrent()->IsJSGlobalObject());
     obj = JSObject::cast(iter.GetCurrent());
   }
@@ skipping 13586 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal