Assign specialized array functions only once.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index e8abdef7f5c17f27468cf1ef7901206b3dc7b281..0255e6db32f23b003038d5619d37fcbd6d7257cd 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -1242,6 +1242,38 @@ static Object* Runtime_FinishArrayPrototypeSetup(Arguments args) {
 }
 
 
+static Handle<JSFunction> InstallFunction(Handle<JSObject> holder,
+                                          const char* name,
+                                          Builtins::Name builtin_name) {
+  Handle<String> key = Factory::LookupAsciiSymbol(name);
+  Handle<Code> code(Builtins::builtin(builtin_name));
+  Handle<JSFunction> optimized = Factory::NewFunction(key,
+                                                      JS_OBJECT_TYPE,
+                                                      JSObject::kHeaderSize,
+                                                      code,
+                                                      false);
+  optimized->shared()->DontAdaptArguments();
+  SetProperty(holder, key, optimized, NONE);
+  return optimized;
+}
+
+
+static Object* Runtime_SpecialArrayFunctions(Arguments args) {
+  HandleScope scope;
+  ASSERT(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSObject, holder, 0);
+
+  InstallFunction(holder, "pop", Builtins::ArrayPop);
+  InstallFunction(holder, "push", Builtins::ArrayPush);
+  InstallFunction(holder, "shift", Builtins::ArrayShift);
+  InstallFunction(holder, "unshift", Builtins::ArrayUnshift);
+  InstallFunction(holder, "slice", Builtins::ArraySlice);
+  InstallFunction(holder, "splice", Builtins::ArraySplice);
+
+  return *holder;
+}
+
+
 static Object* Runtime_MaterializeRegExpLiteral(Arguments args) {
   HandleScope scope;
   ASSERT(args.length() == 4);