Implement Function.prototype.toMethod.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index b6c4525bae5e1b3bc86f92c92b199ebd51d55ab5..d7b52ce8f75ea2922a8ba2a821ea558db209df7b 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -2050,6 +2050,28 @@ RUNTIME_FUNCTION(Runtime_PreventExtensions) {
 }
 
 
+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);