Reland "Mark internal AccessorInfo properties as 'special data properties'"

This reverts commit ac5336ba.

BUG=

Review URL: https://codereview.chromium.org/1138483005

Cr-Commit-Position: refs/heads/master@{#28442}

src/accessors.cc

@@ -32,6 +32,7 @@ Handle<AccessorInfo> Accessors::MakeAccessor(
   info->set_property_attributes(attributes);
   info->set_all_can_read(false);
   info->set_all_can_write(false);
+  info->set_is_special_data_property(true);
   info->set_name(*name);
   Handle<Object> get = v8::FromCData(isolate, getter);
   Handle<Object> set = v8::FromCData(isolate, setter);
@@ -126,31 +127,6 @@ bool Accessors::IsJSArrayBufferViewFieldAccessor(Handle<Map> map,
 }
 
 
-bool SetPropertyOnInstanceIfInherited(
-    Isolate* isolate, const v8::PropertyCallbackInfo<void>& info,
-    v8::Local<v8::Name> name, Handle<Object> value) {
-  Handle<Object> holder = Utils::OpenHandle(*info.Holder());
-  Handle<Object> receiver = Utils::OpenHandle(*info.This());
-  if (*holder == *receiver) return false;
-  if (receiver->IsJSObject()) {
-    Handle<JSObject> object = Handle<JSObject>::cast(receiver);
-    // This behaves sloppy since we lost the actual strict-mode.
-    // TODO(verwaest): Fix by making ExecutableAccessorInfo behave like data
-    // properties.
-    if (object->IsJSGlobalProxy()) {
-      PrototypeIterator iter(isolate, object);
-      if (iter.IsAtEnd()) return true;
-      DCHECK(PrototypeIterator::GetCurrent(iter)->IsJSGlobalObject());
-      object = Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter));
-    }
-    if (!object->map()->is_extensible()) return true;
-    JSObject::SetOwnPropertyIgnoreAttributes(object, Utils::OpenHandle(*name),
-                                             value, NONE).Check();
-  }
-  return true;
-}
-
-
 //
 // Accessors::ArgumentsIterator
 //
@@ -174,8 +150,6 @@ void Accessors::ArgumentsIteratorSetter(
   Handle<JSObject> object = Utils::OpenHandle(*info.This());
   Handle<Object> value = Utils::OpenHandle(*val);
 
-  if (SetPropertyOnInstanceIfInherited(isolate, info, name, value)) return;
-
   LookupIterator it(object, Utils::OpenHandle(*name));
   CHECK_EQ(LookupIterator::ACCESSOR, it.state());
   DCHECK(it.HolderIsReceiverOrHiddenPrototype());
@@ -234,9 +208,6 @@ void Accessors::ArrayLengthSetter(
   HandleScope scope(isolate);
   Handle<JSObject> object = Utils::OpenHandle(*info.This());
   Handle<Object> value = Utils::OpenHandle(*val);
-  if (SetPropertyOnInstanceIfInherited(isolate, info, name, value)) {
-    return;
-  }
 
   value = FlattenNumber(isolate, value);
 
@@ -970,9 +941,6 @@ void Accessors::FunctionPrototypeSetter(
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
   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 (SetFunctionPrototype(isolate, object, value).is_null()) {
@@ -1061,8 +1029,6 @@ void Accessors::FunctionLengthSetter(
   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()) {
@@ -1120,8 +1086,6 @@ void Accessors::FunctionNameSetter(
   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 (SetFunctionName(isolate, object, value).is_null()) {

src/ic/ic.cc

@@ -1671,6 +1671,12 @@ Handle<Code> StoreIC::CompileHandler(LookupIterator* lookup,
           TRACE_GENERIC_IC(isolate(), "StoreIC", "setter == 0");
           break;
         }
+        if (AccessorInfo::cast(*accessors)->is_special_data_property() &&
+            !lookup->HolderIsReceiverOrHiddenPrototype()) {
+          TRACE_GENERIC_IC(isolate(), "StoreIC",
+                           "special data property in prototype chain");
+          break;
+        }
         if (!ExecutableAccessorInfo::IsCompatibleReceiverMap(isolate(), info,
                                                              receiver_map())) {
           TRACE_GENERIC_IC(isolate(), "StoreIC", "incompatible receiver type");

src/lookup.cc

@@ -142,7 +142,9 @@ void LookupIterator::PrepareTransitionToDataProperty(
     Handle<Object> value, PropertyAttributes attributes,
     Object::StoreFromKeyed store_mode) {
   if (state_ == TRANSITION) return;
-  DCHECK_NE(LookupIterator::ACCESSOR, state_);
+  DCHECK(state_ != LookupIterator::ACCESSOR ||
+         (GetAccessors()->IsAccessorInfo() &&
+          AccessorInfo::cast(*GetAccessors())->is_special_data_property()));
   DCHECK_NE(LookupIterator::INTEGER_INDEXED_EXOTIC, state_);
   DCHECK(state_ == NOT_FOUND || !HolderIsReceiverOrHiddenPrototype());
   // Can only be called when the receiver is a JSObject. JSProxy has to be

src/objects-inl.h

@@ -7055,6 +7055,16 @@ void AccessorInfo::set_all_can_write(bool value) {
 }
 
 
+bool AccessorInfo::is_special_data_property() {
+  return BooleanBit::get(flag(), kSpecialDataProperty);
+}
+
+
+void AccessorInfo::set_is_special_data_property(bool value) {
+  set_flag(BooleanBit::set(flag(), kSpecialDataProperty, value));
+}
+
+
 PropertyAttributes AccessorInfo::property_attributes() {
   return AttributesField::decode(static_cast<uint32_t>(flag()->value()));
 }

src/objects.cc

@@ -3215,14 +3215,21 @@ MaybeHandle<Object> Object::SetPropertyInternal(LookupIterator* it,
         }
         break;
 
-      case LookupIterator::ACCESSOR:
+      case LookupIterator::ACCESSOR: {
         if (it->property_details().IsReadOnly()) {
           return WriteToReadOnlyProperty(it, value, language_mode);
         }
+        Handle<Object> accessors = it->GetAccessors();
+        if (accessors->IsAccessorInfo() &&
+            !it->HolderIsReceiverOrHiddenPrototype() &&
+            AccessorInfo::cast(*accessors)->is_special_data_property()) {
+          done = true;
+          break;
+        }
         return SetPropertyWithAccessor(it->GetReceiver(), it->name(), value,
-                                       it->GetHolder<JSObject>(),
-                                       it->GetAccessors(), language_mode);
-
+                                       it->GetHolder<JSObject>(), accessors,
+                                       language_mode);
+      }
       case LookupIterator::INTEGER_INDEXED_EXOTIC:
         done = true;
         break;

src/objects.h

@@ -10517,6 +10517,9 @@ class AccessorInfo: public Struct {
   inline bool all_can_write();
   inline void set_all_can_write(bool value);
 
+  inline bool is_special_data_property();
+  inline void set_is_special_data_property(bool value);
+
   inline PropertyAttributes property_attributes();
   inline void set_property_attributes(PropertyAttributes attributes);
 
@@ -10549,7 +10552,8 @@ class AccessorInfo: public Struct {
   // Bit positions in flag.
   static const int kAllCanReadBit = 0;
   static const int kAllCanWriteBit = 1;
-  class AttributesField : public BitField<PropertyAttributes, 2, 3> {};
+  static const int kSpecialDataProperty = 2;
+  class AttributesField : public BitField<PropertyAttributes, 3, 3> {};
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AccessorInfo);
 };

test/mjsunit/array-length.js

@@ -119,3 +119,9 @@ for (var i = 0; i < 7; i++) {
   t = a.length = 7;
   assertEquals(7, t);
 }
+
+(function () {
+  "use strict";
+  var frozen_object = Object.freeze({__proto__:[]});
+  assertThrows(function () { frozen_object.length = 10 });
+})();

test/mjsunit/es6/arguments-iterator.js

@@ -219,10 +219,7 @@ function TestArgumentsAsProto() {
   assertSame([][Symbol.iterator], o[Symbol.iterator]);
   assertFalse(o.hasOwnProperty(Symbol.iterator));
   assertSame([][Symbol.iterator], o[Symbol.iterator]);
-  // This should throw, but currently it doesn't, because
-  // ExecutableAccessorInfo callbacks don't see the current strict mode.
-  // See note in accessors.cc:SetPropertyOnInstanceIfInherited.
-  o[Symbol.iterator] = 10;
+  assertThrows(function () { o[Symbol.iterator] = 10 });
   assertFalse(o.hasOwnProperty(Symbol.iterator));
   assertEquals([][Symbol.iterator], o[Symbol.iterator]);
   assertSame([][Symbol.iterator], arguments[Symbol.iterator]);

test/mjsunit/regress/regress-489151.js

+// 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.
+
+this.__proto__ = Array.prototype;
+Object.freeze(this);
+function __f_0() {
+  for (var __v_0 = 0; __v_0 < 10; __v_0++) {
+    this.length = 1;
+  }
+}
+ __f_0();