Convert array.length to API-style accessor.

BUG=
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/259773009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@21023 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/accessors.cc

@@ -174,15 +174,6 @@ bool Accessors::IsJSObjectFieldAccessor<HeapType>(Handle<HeapType> type,
 //
 
 
-Object* Accessors::ArrayGetLength(Isolate* isolate,
-                                  Object* object,
-                                  void*) {
-  // Traverse the prototype chain until we reach an array.
-  JSArray* holder = FindInstanceOf<JSArray>(isolate, object);
-  return holder == NULL ? Smi::FromInt(0) : holder->length();
-}
-
-
 // The helper function will 'flatten' Number objects.
 Handle<Object> Accessors::FlattenNumber(Isolate* isolate,
                                         Handle<Object> value) {
@@ -199,55 +190,84 @@ Handle<Object> Accessors::FlattenNumber(Isolate* isolate,
 }
 
 
-Object* Accessors::ArraySetLength(Isolate* isolate,
-                                  JSObject* object_raw,
-                                  Object* value_raw,
-                                  void*) {
+void Accessors::ArrayLengthGetter(
+    v8::Local<v8::String> name,
+    const v8::PropertyCallbackInfo<v8::Value>& info) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
+  DisallowHeapAllocation no_allocation;
   HandleScope scope(isolate);
-  Handle<JSObject> object(object_raw, isolate);
-  Handle<Object> value(value_raw, isolate);
+  Object* object = *Utils::OpenHandle(*info.This());
+  // Traverse the prototype chain until we reach an array.
+  JSArray* holder = FindInstanceOf<JSArray>(isolate, object);
+  Object* result;
+  if (holder != NULL) {
+    result = holder->length();
+  } else {
+    result = Smi::FromInt(0);
+  }
+  info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(result, isolate)));
+}
 
+
+void Accessors::ArrayLengthSetter(
+    v8::Local<v8::String> name,
+    v8::Local<v8::Value> val,
+    const v8::PropertyCallbackInfo<void>& info) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
+  HandleScope scope(isolate);
+  Handle<JSObject> object = Handle<JSObject>::cast(
+      Utils::OpenHandle(*info.This()));
+  Handle<Object> value = Utils::OpenHandle(*val);
   // This means one of the object's prototypes is a JSArray and the
   // object does not have a 'length' property.  Calling SetProperty
   // causes an infinite loop.
   if (!object->IsJSArray()) {
-    Handle<Object> result;
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-        isolate, result,
+    MaybeHandle<Object> maybe_result =
         JSObject::SetLocalPropertyIgnoreAttributes(
-            object, isolate->factory()->length_string(), value, NONE));
-    return *result;
+            object, isolate->factory()->length_string(), value, NONE);
+    maybe_result.ToHandleChecked();
+    return;
   }
 
   value = FlattenNumber(isolate, value);
 
   Handle<JSArray> array_handle = Handle<JSArray>::cast(object);
-
+  MaybeHandle<Object> maybe;
   Handle<Object> uint32_v;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, uint32_v, Execution::ToUint32(isolate, value));
+  maybe = Execution::ToUint32(isolate, value);
+  if (!maybe.ToHandle(&uint32_v)) {
+    isolate->OptionalRescheduleException(false);
+    return;
+  }
   Handle<Object> number_v;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, number_v, Execution::ToNumber(isolate, value));
+  maybe = Execution::ToNumber(isolate, value);
+  if (!maybe.ToHandle(&number_v)) {
+    isolate->OptionalRescheduleException(false);
+    return;
+  }
 
   if (uint32_v->Number() == number_v->Number()) {
-    Handle<Object> result;
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-        isolate, result,
-        JSArray::SetElementsLength(array_handle, uint32_v));
-    return *result;
+    MaybeHandle<Object> result;
+    result = JSArray::SetElementsLength(array_handle, uint32_v);
+    USE(result);
+    return;
   }
-  return isolate->Throw(
+
+  isolate->ScheduleThrow(
       *isolate->factory()->NewRangeError("invalid_array_length",
                                          HandleVector<Object>(NULL, 0)));
 }
 
 
-const AccessorDescriptor Accessors::ArrayLength = {
-  ArrayGetLength,
-  ArraySetLength,
-  0
-};
+Handle<AccessorInfo> Accessors::ArrayLengthInfo(
+      Isolate* isolate, PropertyAttributes attributes) {
+  return MakeAccessor(isolate,
+                      isolate->factory()->length_string(),
+                      &ArrayLengthGetter,
+                      &ArrayLengthSetter,
+                      attributes);
+}
+
 
 
 //

src/accessors.h

@@ -37,9 +37,10 @@ namespace internal {
 // The list of accessor descriptors. This is a second-order macro
 // taking a macro to be applied to all accessor descriptor names.
 #define ACCESSOR_DESCRIPTOR_LIST(V) \
-  V(ArrayLength)
+
 
 #define ACCESSOR_INFO_LIST(V)       \
+  V(ArrayLength)                    \
   V(FunctionArguments)              \
   V(FunctionCaller)                 \
   V(FunctionName)                   \

src/bootstrapper.cc

@@ -863,12 +863,15 @@ void Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
     ASSERT(initial_map->elements_kind() == GetInitialFastElementsKind());
     Map::EnsureDescriptorSlack(initial_map, 1);
 
-    Handle<Foreign> array_length(factory->NewForeign(&Accessors::ArrayLength));
     PropertyAttributes attribs = static_cast<PropertyAttributes>(
         DONT_ENUM | DONT_DELETE);
 
+    Handle<AccessorInfo> array_length =
+        Accessors::ArrayLengthInfo(isolate, attribs);
     {  // Add length.
-      CallbacksDescriptor d(factory->length_string(), array_length, attribs);
+      CallbacksDescriptor d(
+          Handle<Name>(Name::cast(array_length->name())),
+          array_length, attribs);
       array_function->initial_map()->AppendDescriptor(&d);
     }
 
@@ -1614,14 +1617,14 @@ Handle<JSFunction> Genesis::InstallInternalArray(
   // Make "length" magic on instances.
   Map::EnsureDescriptorSlack(initial_map, 1);
 
-  Handle<Foreign> array_length(factory()->NewForeign(
-      &Accessors::ArrayLength));
   PropertyAttributes attribs = static_cast<PropertyAttributes>(
       DONT_ENUM | DONT_DELETE);
 
+  Handle<AccessorInfo> array_length =
+      Accessors::ArrayLengthInfo(isolate(), attribs);
   {  // Add length.
     CallbacksDescriptor d(
-        factory()->length_string(), array_length, attribs);
+        Handle<Name>(Name::cast(array_length->name())), array_length, attribs);
     array_function->initial_map()->AppendDescriptor(&d);
   }