[es6] Initial steps towards a correct implementation of IsCallable.

src/v8natives.js

 // 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.
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 // ----------------------------------------------------------------------------
 // Imports
@@ skipping 200 matching lines @@
   return %IsPropertyEnumerable(TO_OBJECT(this), P);
 }
 
 
 // Extensions for providing property getters and setters.
 function ObjectDefineGetter(name, fun) {
   var receiver = this;
   if (IS_NULL(receiver) || IS_UNDEFINED(receiver)) {
     receiver = %GlobalProxy(ObjectDefineGetter);
   }
-  if (!IS_SPEC_FUNCTION(fun)) {
+  if (!IS_CALLABLE(fun)) {
     throw MakeTypeError(kObjectGetterExpectingFunction);
   }
   var desc = new PropertyDescriptor();
   desc.setGet(fun);
   desc.setEnumerable(true);
   desc.setConfigurable(true);
   DefineOwnProperty(TO_OBJECT(receiver), $toName(name), desc, false);
 }
 
 
 function ObjectLookupGetter(name) {
   var receiver = this;
   if (IS_NULL(receiver) || IS_UNDEFINED(receiver)) {
     receiver = %GlobalProxy(ObjectLookupGetter);
   }
   return %LookupAccessor(TO_OBJECT(receiver), $toName(name), GETTER);
 }
 
 
 function ObjectDefineSetter(name, fun) {
   var receiver = this;
   if (IS_NULL(receiver) || IS_UNDEFINED(receiver)) {
     receiver = %GlobalProxy(ObjectDefineSetter);
   }
-  if (!IS_SPEC_FUNCTION(fun)) {
+  if (!IS_CALLABLE(fun)) {
     throw MakeTypeError(kObjectSetterExpectingFunction);
   }
   var desc = new PropertyDescriptor();
   desc.setSet(fun);
   desc.setEnumerable(true);
   desc.setConfigurable(true);
   DefineOwnProperty(TO_OBJECT(receiver), $toName(name), desc, false);
 }
 
 
@@ skipping 105 matching lines @@
   if ("value" in obj) {
     desc.setValue(obj.value);
   }
 
   if ("writable" in obj) {
     desc.setWritable(ToBoolean(obj.writable));
   }
 
   if ("get" in obj) {
     var get = obj.get;
-    if (!IS_UNDEFINED(get) && !IS_SPEC_FUNCTION(get)) {
+    if (!IS_UNDEFINED(get) && !IS_CALLABLE(get)) {
       throw MakeTypeError(kObjectGetterCallable, get);
     }
     desc.setGet(get);
   }
 
   if ("set" in obj) {
     var set = obj.set;
-    if (!IS_UNDEFINED(set) && !IS_SPEC_FUNCTION(set)) {
+    if (!IS_UNDEFINED(set) && !IS_CALLABLE(set)) {
       throw MakeTypeError(kObjectSetterCallable, set);
     }
     desc.setSet(set);
   }
 
   if (IsInconsistentDescriptor(desc)) {
     throw MakeTypeError(kValueAndAccessor, obj);
   }
   return desc;
 }
@@ skipping 139 matching lines @@
 
 
 // For Harmony proxies.
 function GetTrap(handler, name, defaultTrap) {
   var trap = handler[name];
   if (IS_UNDEFINED(trap)) {
     if (IS_UNDEFINED(defaultTrap)) {
       throw MakeTypeError(kProxyHandlerTrapMissing, handler, name);
     }
     trap = defaultTrap;
-  } else if (!IS_SPEC_FUNCTION(trap)) {
+  } else if (!IS_CALLABLE(trap)) {
     throw MakeTypeError(kProxyHandlerTrapMustBeCallable, handler, name);
   }
   return trap;
 }
 
 
 function CallTrap0(handler, name, defaultTrap) {
   return %_CallFunction(handler, GetTrap(handler, name, defaultTrap));
 }
 
@@ skipping 48 matching lines @@
   } else {
     return;
   }
 }
 
 
 // ES6, draft 12-24-14, section 7.3.8
 function GetMethod(obj, p) {
   var func = obj[p];
   if (IS_NULL_OR_UNDEFINED(func)) return UNDEFINED;
-  if (IS_SPEC_FUNCTION(func)) return func;
+  if (IS_CALLABLE(func)) return func;
   throw MakeTypeError(kCalledNonCallable, typeof func);
 }
 
 
 // Harmony proxies.
 function DefineProxyProperty(obj, p, attributes, should_throw) {
   // TODO(rossberg): adjust once there is a story for symbols vs proxies.
   if (IS_SYMBOL(p)) return false;
 
   var handler = %GetHandler(obj);
@@ skipping 1032 matching lines @@
 }
 
 
 function FunctionToString() {
   return FunctionSourceString(this);
 }
 
 
 // ES5 15.3.4.5
 function FunctionBind(this_arg) { // Length is 1.
-  if (!IS_SPEC_FUNCTION(this)) throw MakeTypeError(kFunctionBind);
+  if (!IS_CALLABLE(this)) throw MakeTypeError(kFunctionBind);
 
   var boundFunction = function () {
     // Poison .arguments and .caller, but is otherwise not detectable.
     "use strict";
     // This function must not use any object literals (Object, Array, RegExp),
     // since the literals-array is being used to store the bound data.
     if (%_IsConstructCall()) {
       return %NewObjectFromBound(boundFunction);
     }
     var bindings = %BoundFunctionGetBindings(boundFunction);
@@ skipping 95 matching lines @@
 
 // ----------------------------------------------------------------------------
 // Iterator related spec functions.
 
 // ES6 rev 33, 2015-02-12
 // 7.4.1 GetIterator ( obj, method )
 function GetIterator(obj, method) {
   if (IS_UNDEFINED(method)) {
     method = obj[symbolIterator];
   }
-  if (!IS_SPEC_FUNCTION(method)) {
+  if (!IS_CALLABLE(method)) {
     throw MakeTypeError(kNotIterable, obj);
   }
   var iterator = %_CallFunction(obj, method);
   if (!IS_SPEC_OBJECT(iterator)) {
     throw MakeTypeError(kNotAnIterator, iterator);
   }
   return iterator;
 }
 
 // ----------------------------------------------------------------------------
@@ skipping 21 matching lines @@
 });
 
 %InstallToContext([
   "global_eval_fun", GlobalEval,
   "object_define_own_property", DefineOwnPropertyFromAPI,
   "object_get_own_property_descriptor", ObjectGetOwnPropertyDescriptor,
   "to_complete_property_descriptor", ToCompletePropertyDescriptor,
 ]);
 
 })