[es6] Function length property should be configurable

ES6 specs the function length property (it was not part of ES5) and
it makes it configurable.

BUG=v8:3045
LOG=N
R=mstarzinger@chromium.org, adamk@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/993073002

Cr-Commit-Position: refs/heads/master@{#27190}

src/accessors.cc

@@ -1095,12 +1095,52 @@ void Accessors::FunctionLengthGetter(
 }
 
 
+MUST_USE_RESULT static MaybeHandle<Object> ReplaceAccessorWithDataProperty(
+    Isolate* isolate, Handle<JSObject> object, Handle<Name> name,
+    Handle<Object> value, bool is_observed, Handle<Object> old_value) {
+  LookupIterator it(object, name);
+  CHECK_EQ(LookupIterator::ACCESSOR, it.state());
+  DCHECK(it.HolderIsReceiverOrHiddenPrototype());
+  it.ReconfigureDataProperty(value, it.property_details().attributes());
+  value = it.WriteDataValue(value);
+
+  if (is_observed && !old_value->SameValue(*value)) {
+    return JSObject::EnqueueChangeRecord(object, "update", name, old_value);
+  }
+
+  return value;
+}
+
+
+MUST_USE_RESULT static MaybeHandle<Object> SetFunctionLength(
+    Isolate* isolate, Handle<JSFunction> function, Handle<Object> value) {
+  Handle<Object> old_value;
+  bool is_observed = function->map()->is_observed();
+  if (is_observed) {
+    old_value = handle(Smi::FromInt(function->shared()->length()), isolate);
+  }
+
+  return ReplaceAccessorWithDataProperty(isolate, function,
+                                         isolate->factory()->length_string(),
+                                         value, is_observed, old_value);
+}
+
+
 void Accessors::FunctionLengthSetter(
     v8::Local<v8::Name> name,
     v8::Local<v8::Value> val,
     const v8::PropertyCallbackInfo<void>& info) {
-  // Function length is non writable, non configurable.
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
-  UNREACHABLE();
+  HandleScope scope(isolate);
+  Handle<Object> value = Utils::OpenHandle(*val);
+
+  if (SetPropertyOnInstanceIfInherited(isolate, info, name, value)) return;
+
+  Handle<JSFunction> object =
+      Handle<JSFunction>::cast(Utils::OpenHandle(*info.Holder()));
+  if (SetFunctionLength(isolate, object, value).is_null()) {
+    isolate->OptionalRescheduleException(false);
+  }
 }
 
 
@@ -1139,18 +1179,9 @@ MUST_USE_RESULT static MaybeHandle<Object> SetFunctionName(
     old_value = handle(function->shared()->name(), isolate);
   }
 
-  Handle<Name> name = isolate->factory()->name_string();
+  return ReplaceAccessorWithDataProperty(isolate, function,
-  LookupIterator it(function, name);
+                                         isolate->factory()->name_string(),
-  CHECK_EQ(LookupIterator::ACCESSOR, it.state());
+                                         value, is_observed, old_value);
-  DCHECK(it.HolderIsReceiverOrHiddenPrototype());
-  it.ReconfigureDataProperty(value, it.property_details().attributes());
-  value = it.WriteDataValue(value);
-
-  if (is_observed && !old_value->SameValue(*value)) {
-    return JSObject::EnqueueChangeRecord(function, "update", name, old_value);
-  }
-
-  return value;
 }
 
 

src/bootstrapper.cc

@@ -388,10 +388,10 @@ void Genesis::SetFunctionInstanceDescriptor(
       static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
 
   Handle<AccessorInfo> length =
-      Accessors::FunctionLengthInfo(isolate(), ro_attribs);
+      Accessors::FunctionLengthInfo(isolate(), roc_attribs);
   {  // Add length.
     AccessorConstantDescriptor d(Handle<Name>(Name::cast(length->name())),
-                                 length, ro_attribs);
+                                 length, roc_attribs);
     map->AppendDescriptor(&d);
   }
   Handle<AccessorInfo> name =
@@ -555,9 +555,9 @@ void Genesis::SetStrictFunctionInstanceDescriptor(
            function_mode == FUNCTION_WITH_READONLY_PROTOTYPE ||
            function_mode == FUNCTION_WITHOUT_PROTOTYPE);
     Handle<AccessorInfo> length =
-        Accessors::FunctionLengthInfo(isolate(), ro_attribs);
+        Accessors::FunctionLengthInfo(isolate(), roc_attribs);
     AccessorConstantDescriptor d(Handle<Name>(Name::cast(length->name())),
-                                 length, ro_attribs);
+                                 length, roc_attribs);
     map->AppendDescriptor(&d);
   }
   Handle<AccessorInfo> name =

test/mjsunit/es6/function-length-configurable.js

@@ -0,0 +1,119 @@
+// Copyright 2015 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 getStrictF() {
+  'use strict';
+  return function f(x) {};
+}
+
+
+function getSloppyF() {
+  return function f(x) {};
+}
+
+
+function getStrictGenerator() {
+  'use strict';
+  return function* f(x) {};
+}
+
+
+function getSloppyGenerator() {
+  return function* f(x) {};
+}
+
+
+function test(testFunction) {
+  testFunction(getStrictF());
+  testFunction(getSloppyF());
+  testFunction(getStrictGenerator());
+  testFunction(getSloppyGenerator());
+}
+
+
+function testDescriptor(f) {
+  var descr = Object.getOwnPropertyDescriptor(f, 'length');
+  assertTrue(descr.configurable);
+  assertFalse(descr.enumerable);
+  assertEquals(1, descr.value);
+  assertFalse(descr.writable);
+}
+test(testDescriptor);
+
+
+function testSet(f) {
+  f.length = 2;
+  assertEquals(1, f.length);
+}
+test(testSet);
+
+
+function testSetStrict(f) {
+  'use strict';
+  assertThrows(function() {
+    f.length = 2;
+  }, TypeError);
+}
+test(testSetStrict);
+
+
+function testReconfigureAsDataProperty(f) {
+  Object.defineProperty(f, 'length', {
+    value: 2,
+  });
+  assertEquals(2, f.length);
+  Object.defineProperty(f, 'length', {
+    writable: true
+  });
+  f.length = 3;
+  assertEquals(3, f.length);
+
+  f.length = 42;
+  assertEquals(42, f.length);
+}
+test(testReconfigureAsDataProperty);
+
+
+function testReconfigureAsAccessorProperty(f) {
+  var length = 2;
+  Object.defineProperty(f, 'length', {
+    get: function() { return length; },
+    set: function(v) { length = v; }
+  });
+  assertEquals(2, f.length);
+  f.length = 3;
+  assertEquals(3, f.length);
+}
+test(testReconfigureAsAccessorProperty);
+
+
+(function testSetOnInstance() {
+  // This needs to come before testDelete below
+  assertTrue(Function.prototype.hasOwnProperty('length'));
+
+  function f() {}
+  delete f.length;
+  assertEquals(0, f.length);
+
+  f.length = 42;
+  assertEquals(0, f.length);  // non writable prototype property.
+  assertFalse(f.hasOwnProperty('length'));
+
+  Object.defineProperty(Function.prototype, 'length', {writable: true});
+
+  f.length = 123;
+  assertTrue(f.hasOwnProperty('length'));
+  assertEquals(123, f.length);
+})();
+
+
+(function testDelete() {
+  function f(x) {}
+  assertTrue(delete f.length);
+  assertFalse(f.hasOwnProperty('length'));
+  assertEquals(0, f.length);
+
+  assertTrue(delete Function.prototype.length);
+  assertEquals(undefined, f.length);
+})();

test/mjsunit/es7/object-observe.js

@@ -1143,7 +1143,8 @@ function blacklisted(obj, prop) {
   return (obj instanceof Int32Array && prop == 1) ||
          (obj instanceof Int32Array && prop === "length") ||
          (obj instanceof ArrayBuffer && prop == 1) ||
-         (obj instanceof Function && prop === "name");  // Has its own test.
+         (obj instanceof Function && prop === "name") ||  // Has its own test.
+         (obj instanceof Function && prop === "length");  // Has its own test.
 }
 
 for (var i in objects) for (var j in properties) {
@@ -1826,6 +1827,31 @@ for (var b1 = 0; b1 < 2; ++b1)
 })();
 
 
+(function TestFunctionLength() {
+  reset();
+
+  function fun(x) {}
+  Object.observe(fun, observer.callback);
+  fun.length = 'x';  // No change. Not writable.
+  Object.defineProperty(fun, 'length', {value: 'a'});
+  Object.defineProperty(fun, 'length', {writable: true});
+  fun.length = 'b';
+  delete fun.length;
+  fun.length = 'x';  // No change. Function.prototype.length is non writable
+  Object.defineProperty(Function.prototype, 'length', {writable: true});
+  fun.length = 'c';
+  fun.length = 'c';  // Same, no update.
+  Object.deliverChangeRecords(observer.callback);
+  observer.assertCallbackRecords([
+    { object: fun, type: 'update', name: 'length', oldValue: 1 },
+    { object: fun, type: 'reconfigure', name: 'length'},
+    { object: fun, type: 'update', name: 'length', oldValue: 'a' },
+    { object: fun, type: 'delete', name: 'length', oldValue: 'b' },
+    { object: fun, type: 'add', name: 'length' },
+  ]);
+})();
+
+
 (function TestObserveInvalidAcceptMessage() {
   var ex;
   try {

test/mjsunit/regress/regress-1530.js

@@ -82,7 +82,8 @@ assertThrows("Object.defineProperty(f, 'prototype', { value: {} })");
 
 // Verify that non-configurability of other properties is respected, but
 // non-writability is ignored by Object.defineProperty().
+// name and length are configurable in ES6
 Object.defineProperty(f, 'name', { value: {} });
-assertThrows("Object.defineProperty(f, 'length', { value: {} })");
+Object.defineProperty(f, 'length', { value: {} });
 assertThrows("Object.defineProperty(f, 'caller', { value: {} })");
 assertThrows("Object.defineProperty(f, 'arguments', { value: {} })");

test/mjsunit/regress/regress-function-length-strict.js

@@ -37,5 +37,5 @@ var desc = Object.getOwnPropertyDescriptor(foo, 'length');
 assertEquals(3, desc.value);
 assertFalse(desc.writable);
 assertFalse(desc.enumerable);
-assertFalse(desc.configurable);
+assertTrue(desc.configurable);
 assertThrows(function() { foo.length = 2; }, TypeError);

test/mozilla/mozilla.status

@@ -61,6 +61,19 @@
   # TODO(turbofan): Large switch statements crash.
   'js1_5/Regress/regress-398085-01': [PASS, NO_VARIANTS],
 
+  ############################ INVALID TESTS #############################
+
+  # Function length properties are configurable in ES6
+  'ecma/Array/15.4.4.3-1': [FAIL],
+  'ecma/Array/15.4.4.4-1': [FAIL],
+  'ecma/Array/15.4.4.4-2': [FAIL],
+  'ecma/String/15.5.4.10-1': [FAIL],
+  'ecma/String/15.5.4.11-1': [FAIL],
+  'ecma/String/15.5.4.7-2': [FAIL],
+  'ecma/String/15.5.4.8-1': [FAIL],
+  'ecma/String/15.5.4.9-1': [FAIL],
+
+
   ##################### SKIPPED TESTS #####################
 
   # This test checks that we behave properly in an out-of-memory

test/test262-es6/test262-es6.status

@@ -174,6 +174,132 @@
   'es6/String.prototype.contains/String.prototype.contains_Success' : [FAIL_OK],
   'es6/String.prototype.contains/String.prototype.contains_SuccessNoLocation' : [FAIL_OK],
 
+  # Function length properties are configurable in ES6
+  'ch11/11.4/11.4.1/11.4.1-5-a-28-s': [FAIL],
+  'ch13/13.2/13.2-15-1': [FAIL],
+  'ch15/15.1/15.1.2/15.1.2.1/S15.1.2.1_A4.2': [FAIL],
+  'ch15/15.1/15.1.2/15.1.2.2/S15.1.2.2_A9.2': [FAIL],
+  'ch15/15.1/15.1.2/15.1.2.3/S15.1.2.3_A7.2': [FAIL],
+  'ch15/15.1/15.1.2/15.1.2.4/S15.1.2.4_A2.2': [FAIL],
+  'ch15/15.1/15.1.2/15.1.2.5/S15.1.2.5_A2.2': [FAIL],
+  'ch15/15.1/15.1.3/15.1.3.1/S15.1.3.1_A5.2': [FAIL],
+  'ch15/15.1/15.1.3/15.1.3.2/S15.1.3.2_A5.2': [FAIL],
+  'ch15/15.1/15.1.3/15.1.3.3/S15.1.3.3_A5.2': [FAIL],
+  'ch15/15.1/15.1.3/15.1.3.4/S15.1.3.4_A5.2': [FAIL],
+  'ch15/15.10/15.10.6/15.10.6.2/S15.10.6.2_A9': [FAIL],
+  'ch15/15.10/15.10.6/15.10.6.3/S15.10.6.3_A9': [FAIL],
+  'ch15/15.10/15.10.6/15.10.6.4/S15.10.6.4_A9': [FAIL],
+  'ch15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-186': [FAIL],
+  'ch15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-187': [FAIL],
+  'ch15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-191': [FAIL],
+  'ch15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-194': [FAIL],
+  'ch15/15.2/15.2.3/15.2.3.3/15.2.3.3-4-201': [FAIL],
+  'ch15/15.2/15.2.4/15.2.4.2/S15.2.4.2_A9': [FAIL],
+  'ch15/15.2/15.2.4/15.2.4.3/S15.2.4.3_A9': [FAIL],
+  'ch15/15.2/15.2.4/15.2.4.4/S15.2.4.4_A9': [FAIL],
+  'ch15/15.2/15.2.4/15.2.4.5/S15.2.4.5_A9': [FAIL],
+  'ch15/15.2/15.2.4/15.2.4.6/S15.2.4.6_A9': [FAIL],
+  'ch15/15.2/15.2.4/15.2.4.7/S15.2.4.7_A9': [FAIL],
+  'ch15/15.3/15.3.3/15.3.3.2/15.3.3.2-1': [FAIL],
+  'ch15/15.3/15.3.4/15.3.4.2/S15.3.4.2_A9': [FAIL],
+  'ch15/15.3/15.3.4/15.3.4.3/S15.3.4.3_A9': [FAIL],
+  'ch15/15.3/15.3.4/15.3.4.4/S15.3.4.4_A9': [FAIL],
+  'ch15/15.3/15.3.5/S15.3.5.1_A2_T1': [FAIL],
+  'ch15/15.3/15.3.5/S15.3.5.1_A2_T2': [FAIL],
+  'ch15/15.3/15.3.5/S15.3.5.1_A2_T3': [FAIL],
+  'ch15/15.4/15.4.3/S15.4.3_A2.2': [FAIL],
+  'ch15/15.4/15.4.4/15.4.4.10/S15.4.4.10_A5.2': [FAIL],
+  'ch15/15.4/15.4.4/15.4.4.11/S15.4.4.11_A7.2': [FAIL],
+  'ch15/15.4/15.4.4/15.4.4.12/S15.4.4.12_A5.2': [FAIL],
+  'ch15/15.4/15.4.4/15.4.4.13/S15.4.4.13_A5.2': [FAIL],
+  'ch15/15.4/15.4.4/15.4.4.2/S15.4.4.2_A4.2': [FAIL],
+  'ch15/15.4/15.4.4/15.4.4.3/S15.4.4.3_A4.2': [FAIL],
+  'ch15/15.4/15.4.4/15.4.4.4/S15.4.4.4_A4.2': [FAIL],
+  'ch15/15.4/15.4.4/15.4.4.5/S15.4.4.5_A6.2': [FAIL],
+  'ch15/15.4/15.4.4/15.4.4.6/S15.4.4.6_A5.2': [FAIL],
+  'ch15/15.4/15.4.4/15.4.4.7/S15.4.4.7_A6.2': [FAIL],
+  'ch15/15.4/15.4.4/15.4.4.8/S15.4.4.8_A5.2': [FAIL],
+  'ch15/15.4/15.4.4/15.4.4.9/S15.4.4.9_A5.2': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.10/S15.5.4.10_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.11/S15.5.4.11_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.12/S15.5.4.12_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.13/S15.5.4.13_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.14/S15.5.4.14_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.15/S15.5.4.15_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.16/S15.5.4.16_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.17/S15.5.4.17_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.18/S15.5.4.18_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.19/S15.5.4.19_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.4/S15.5.4.4_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.5/S15.5.4.5_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.6/S15.5.4.6_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.7/S15.5.4.7_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.8/S15.5.4.8_A9': [FAIL],
+  'ch15/15.5/15.5.4/15.5.4.9/S15.5.4.9_A9': [FAIL],
+  'ch15/15.9/15.9.4/15.9.4.2/S15.9.4.2_A3_T2': [FAIL],
+  'ch15/15.9/15.9.4/15.9.4.3/S15.9.4.3_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.1/S15.9.5.1_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.10/S15.9.5.10_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.11/S15.9.5.11_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.12/S15.9.5.12_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.13/S15.9.5.13_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.14/S15.9.5.14_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.15/S15.9.5.15_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.16/S15.9.5.16_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.17/S15.9.5.17_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.18/S15.9.5.18_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.19/S15.9.5.19_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.2/S15.9.5.2_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.20/S15.9.5.20_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.21/S15.9.5.21_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.22/S15.9.5.22_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.23/S15.9.5.23_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.24/S15.9.5.24_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.25/S15.9.5.25_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.26/S15.9.5.26_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.27/S15.9.5.27_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.28/S15.9.5.28_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.29/S15.9.5.29_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.3/S15.9.5.3_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.30/S15.9.5.30_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.31/S15.9.5.31_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.32/S15.9.5.32_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.33/S15.9.5.33_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.34/S15.9.5.34_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.35/S15.9.5.35_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.36/S15.9.5.36_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.37/S15.9.5.37_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.38/S15.9.5.38_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.39/S15.9.5.39_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.4/S15.9.5.4_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.40/S15.9.5.40_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.41/S15.9.5.41_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.42/S15.9.5.42_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.5/S15.9.5.5_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.6/S15.9.5.6_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.7/S15.9.5.7_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.8/S15.9.5.8_A3_T2': [FAIL],
+  'ch15/15.9/15.9.5/15.9.5.9/S15.9.5.9_A3_T2': [FAIL],
+  'intl402/ch10/10.1/10.1_L15': [FAIL],
+  'intl402/ch10/10.2/10.2.2_L15': [FAIL],
+  'intl402/ch10/10.3/10.3.2_1_a_L15': [FAIL],
+  'intl402/ch10/10.3/10.3.2_L15': [FAIL],
+  'intl402/ch10/10.3/10.3.3_L15': [FAIL],
+  'intl402/ch11/11.1/11.1_L15': [FAIL],
+  'intl402/ch11/11.2/11.2.2_L15': [FAIL],
+  'intl402/ch11/11.3/11.3.2_1_a_L15': [FAIL],
+  'intl402/ch11/11.3/11.3.2_L15': [FAIL],
+  'intl402/ch11/11.3/11.3.3_L15': [FAIL],
+  'intl402/ch12/12.1/12.1_L15': [FAIL],
+  'intl402/ch12/12.2/12.2.2_L15': [FAIL],
+  'intl402/ch12/12.3/12.3.2_1_a_L15': [FAIL],
+  'intl402/ch12/12.3/12.3.2_L15': [FAIL],
+  'intl402/ch12/12.3/12.3.3_L15': [FAIL],
+  'intl402/ch13/13.1/13.1.1_L15': [FAIL],
+  'intl402/ch13/13.2/13.2.1_L15': [FAIL],
+  'intl402/ch13/13.3/13.3.1_L15': [FAIL],
+  'intl402/ch13/13.3/13.3.2_L15': [FAIL],
+  'intl402/ch13/13.3/13.3.3_L15': [FAIL],
 
   ############################ SKIPPED TESTS #############################
 

test/test262/test262.status

@@ -62,6 +62,133 @@
   '11.1.5_4-4-d-3': [FAIL],
   '11.1.5_4-4-d-4': [FAIL],
 
+  # Function length properties are configurable in ES6
+  '10.1_L15': [FAIL],
+  '10.2.2_L15': [FAIL],
+  '10.3.2_1_a_L15': [FAIL],
+  '10.3.2_L15': [FAIL],
+  '10.3.3_L15': [FAIL],
+  '11.1_L15': [FAIL],
+  '11.2.2_L15': [FAIL],
+  '11.3.2_1_a_L15': [FAIL],
+  '11.3.2_L15': [FAIL],
+  '11.3.3_L15': [FAIL],
+  '11.4.1-5-a-28-s': [FAIL],
+  '12.1_L15': [FAIL],
+  '12.2.2_L15': [FAIL],
+  '12.3.2_1_a_L15': [FAIL],
+  '12.3.2_L15': [FAIL],
+  '12.3.3_L15': [FAIL],
+  '13.1.1_L15': [FAIL],
+  '13.2-15-1': [FAIL],
+  '13.2.1_L15': [FAIL],
+  '13.3.1_L15': [FAIL],
+  '13.3.2_L15': [FAIL],
+  '13.3.3_L15': [FAIL],
+  '15.2.3.3-4-186': [FAIL],
+  '15.2.3.3-4-187': [FAIL],
+  '15.2.3.3-4-191': [FAIL],
+  '15.2.3.3-4-194': [FAIL],
+  '15.2.3.3-4-201': [FAIL],
+  '15.3.3.2-1': [FAIL],
+  'S15.1.2.1_A4.2': [FAIL],
+  'S15.1.2.2_A9.2': [FAIL],
+  'S15.1.2.3_A7.2': [FAIL],
+  'S15.1.2.4_A2.2': [FAIL],
+  'S15.1.2.5_A2.2': [FAIL],
+  'S15.1.3.1_A5.2': [FAIL],
+  'S15.1.3.2_A5.2': [FAIL],
+  'S15.1.3.3_A5.2': [FAIL],
+  'S15.1.3.4_A5.2': [FAIL],
+  'S15.10.6.2_A9': [FAIL],
+  'S15.10.6.3_A9': [FAIL],
+  'S15.10.6.4_A9': [FAIL],
+  'S15.2.4.2_A9': [FAIL],
+  'S15.2.4.3_A9': [FAIL],
+  'S15.2.4.4_A9': [FAIL],
+  'S15.2.4.5_A9': [FAIL],
+  'S15.2.4.6_A9': [FAIL],
+  'S15.2.4.7_A9': [FAIL],
+  'S15.3.4.2_A9': [FAIL],
+  'S15.3.4.3_A9': [FAIL],
+  'S15.3.4.4_A9': [FAIL],
+  'S15.3.5.1_A2_T1': [FAIL],
+  'S15.3.5.1_A2_T2': [FAIL],
+  'S15.3.5.1_A2_T3': [FAIL],
+  'S15.4.3_A2.2': [FAIL],
+  'S15.4.4.10_A5.2': [FAIL],
+  'S15.4.4.11_A7.2': [FAIL],
+  'S15.4.4.12_A5.2': [FAIL],
+  'S15.4.4.13_A5.2': [FAIL],
+  'S15.4.4.2_A4.2': [FAIL],
+  'S15.4.4.3_A4.2': [FAIL],
+  'S15.4.4.4_A4.2': [FAIL],
+  'S15.4.4.5_A6.2': [FAIL],
+  'S15.4.4.6_A5.2': [FAIL],
+  'S15.4.4.7_A6.2': [FAIL],
+  'S15.4.4.8_A5.2': [FAIL],
+  'S15.4.4.9_A5.2': [FAIL],
+  'S15.5.4.10_A9': [FAIL],
+  'S15.5.4.11_A9': [FAIL],
+  'S15.5.4.12_A9': [FAIL],
+  'S15.5.4.13_A9': [FAIL],
+  'S15.5.4.14_A9': [FAIL],
+  'S15.5.4.15_A9': [FAIL],
+  'S15.5.4.16_A9': [FAIL],
+  'S15.5.4.17_A9': [FAIL],
+  'S15.5.4.18_A9': [FAIL],
+  'S15.5.4.19_A9': [FAIL],
+  'S15.5.4.4_A9': [FAIL],
+  'S15.5.4.5_A9': [FAIL],
+  'S15.5.4.6_A9': [FAIL],
+  'S15.5.4.7_A9': [FAIL],
+  'S15.5.4.8_A9': [FAIL],
+  'S15.5.4.9_A9': [FAIL],
+  'S15.9.4.2_A3_T2': [FAIL],
+  'S15.9.4.3_A3_T2': [FAIL],
+  'S15.9.5.10_A3_T2': [FAIL],
+  'S15.9.5.11_A3_T2': [FAIL],
+  'S15.9.5.12_A3_T2': [FAIL],
+  'S15.9.5.13_A3_T2': [FAIL],
+  'S15.9.5.14_A3_T2': [FAIL],
+  'S15.9.5.15_A3_T2': [FAIL],
+  'S15.9.5.16_A3_T2': [FAIL],
+  'S15.9.5.17_A3_T2': [FAIL],
+  'S15.9.5.18_A3_T2': [FAIL],
+  'S15.9.5.19_A3_T2': [FAIL],
+  'S15.9.5.1_A3_T2': [FAIL],
+  'S15.9.5.20_A3_T2': [FAIL],
+  'S15.9.5.21_A3_T2': [FAIL],
+  'S15.9.5.22_A3_T2': [FAIL],
+  'S15.9.5.23_A3_T2': [FAIL],
+  'S15.9.5.24_A3_T2': [FAIL],
+  'S15.9.5.25_A3_T2': [FAIL],
+  'S15.9.5.26_A3_T2': [FAIL],
+  'S15.9.5.27_A3_T2': [FAIL],
+  'S15.9.5.28_A3_T2': [FAIL],
+  'S15.9.5.29_A3_T2': [FAIL],
+  'S15.9.5.2_A3_T2': [FAIL],
+  'S15.9.5.30_A3_T2': [FAIL],
+  'S15.9.5.31_A3_T2': [FAIL],
+  'S15.9.5.32_A3_T2': [FAIL],
+  'S15.9.5.33_A3_T2': [FAIL],
+  'S15.9.5.34_A3_T2': [FAIL],
+  'S15.9.5.35_A3_T2': [FAIL],
+  'S15.9.5.36_A3_T2': [FAIL],
+  'S15.9.5.37_A3_T2': [FAIL],
+  'S15.9.5.38_A3_T2': [FAIL],
+  'S15.9.5.39_A3_T2': [FAIL],
+  'S15.9.5.3_A3_T2': [FAIL],
+  'S15.9.5.40_A3_T2': [FAIL],
+  'S15.9.5.41_A3_T2': [FAIL],
+  'S15.9.5.42_A3_T2': [FAIL],
+  'S15.9.5.4_A3_T2': [FAIL],
+  'S15.9.5.5_A3_T2': [FAIL],
+  'S15.9.5.6_A3_T2': [FAIL],
+  'S15.9.5.7_A3_T2': [FAIL],
+  'S15.9.5.8_A3_T2': [FAIL],
+  'S15.9.5.9_A3_T2': [FAIL],
+
   ######################## NEEDS INVESTIGATION ###########################
 
   # These test failures are specific to the intl402 suite and need investigation

test/webkit/fast/js/kde/prototype_length-expected.txt

@@ -39,7 +39,7 @@ PASS Array.prototype.length is 6
 PASS Function.prototype.length is 0
 PASS String.prototype.length is 0
 PASS delete Array.prototype.length is false
-PASS delete Function.prototype.length is false
+PASS delete Function.prototype.length is true
 PASS delete String.prototype.length is false
 PASS foundArrayPrototypeLength is false
 PASS foundFunctionPrototypeLength is false

test/webkit/fast/js/kde/prototype_length.js

@@ -43,7 +43,7 @@ shouldBe("String.prototype.length","0");
 
 // check DontDelete
 shouldBe("delete Array.prototype.length","false");
-shouldBe("delete Function.prototype.length","false");
+shouldBe("delete Function.prototype.length","true");
 shouldBe("delete String.prototype.length","false");
 
 // check DontEnum