Reland r20652 "Handlify and convert string.length to new API-style accessor."

BUG=
R=dcarney@chromium.org, yangguo@chromium.org

Review URL: https://codereview.chromium.org/231973004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20767 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/accessors.cc

@@ -37,11 +37,33 @@
 #include "isolate.h"
 #include "list-inl.h"
 #include "property-details.h"
+#include "api.h"
 
 namespace v8 {
 namespace internal {
 
 
+static Handle<AccessorInfo> MakeAccessor(Isolate* isolate,
+                                         Handle<String> name,
+                                         AccessorGetterCallback getter,
+                                         AccessorSetterCallback setter,
+                                         PropertyAttributes attributes) {
+  Factory* factory = isolate->factory();
+  Handle<ExecutableAccessorInfo> info = factory->NewExecutableAccessorInfo();
+  info->set_property_attributes(attributes);
+  info->set_all_can_read(true);
+  info->set_all_can_write(true);
+  info->set_prohibits_overwriting(false);
+  info->set_name(*factory->length_string());
+  info->set_property_attributes(attributes);
+  Handle<Object> get = v8::FromCData(isolate, getter);
+  Handle<Object> set = v8::FromCData(isolate, setter);
+  info->set_getter(*get);
+  info->set_setter(*set);
+  return info;
+}
+
+
 template <class C>
 static C* FindInstanceOf(Isolate* isolate, Object* obj) {
   for (Object* cur = obj; !cur->IsNull(); cur = cur->GetPrototype(isolate)) {
@@ -233,24 +255,42 @@ const AccessorDescriptor Accessors::ArrayLength = {
 // Accessors::StringLength
 //
 
-
-MaybeObject* Accessors::StringGetLength(Isolate* isolate,
-                                        Object* object,
-                                        void*) {
-  Object* value = object;
-  if (object->IsJSValue()) value = JSValue::cast(object)->value();
-  if (value->IsString()) return Smi::FromInt(String::cast(value)->length());
+void Accessors::StringLengthGetter(
+    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);
+  Object* value = *Utils::OpenHandle(*info.This());
+  Object* result;
+  if (value->IsJSValue()) value = JSValue::cast(value)->value();
+  if (value->IsString()) {
+    result = Smi::FromInt(String::cast(value)->length());
+  } else {
     // If object is not a string we return 0 to be compatible with WebKit.
     // Note: Firefox returns the length of ToString(object).
-  return Smi::FromInt(0);
+    result = Smi::FromInt(0);
+  }
+  info.GetReturnValue().Set(Utils::ToLocal(Handle<Object>(result, isolate)));
 }
 
 
-const AccessorDescriptor Accessors::StringLength = {
-  StringGetLength,
-  IllegalSetter,
-  0
-};
+void Accessors::StringLengthSetter(
+    v8::Local<v8::String> name,
+    v8::Local<v8::Value> value,
+    const v8::PropertyCallbackInfo<void>& info) {
+  UNREACHABLE();
+}
+
+
+Handle<AccessorInfo> Accessors::StringLengthInfo(
+      Isolate* isolate, PropertyAttributes attributes) {
+  return MakeAccessor(isolate,
+                      isolate->factory()->length_string(),
+                      &StringLengthGetter,
+                      &StringLengthSetter,
+                      attributes);
+}
 
 
 //

src/accessors.h

@@ -43,7 +43,6 @@ namespace internal {
   V(FunctionArguments)              \
   V(FunctionCaller)                 \
   V(ArrayLength)                    \
-  V(StringLength)                   \
   V(ScriptSource)                   \
   V(ScriptName)                     \
   V(ScriptId)                       \
@@ -57,6 +56,9 @@ namespace internal {
   V(ScriptEvalFromScriptPosition)   \
   V(ScriptEvalFromFunctionName)
 
+#define ACCESSOR_INFO_LIST(V)       \
+  V(StringLength)                   \
+
 // Accessors contains all predefined proxy accessors.
 
 class Accessors : public AllStatic {
@@ -67,11 +69,30 @@ class Accessors : public AllStatic {
   ACCESSOR_DESCRIPTOR_LIST(ACCESSOR_DESCRIPTOR_DECLARATION)
 #undef ACCESSOR_DESCRIPTOR_DECLARATION
 
+#define ACCESSOR_INFO_DECLARATION(name)                   \
+  static void name##Getter(                               \
+      v8::Local<v8::String> name,                         \
+      const v8::PropertyCallbackInfo<v8::Value>& info);   \
+  static void name##Setter(                               \
+      v8::Local<v8::String> name,                         \
+      v8::Local<v8::Value> value,                         \
+      const v8::PropertyCallbackInfo<void>& info);   \
+  static Handle<AccessorInfo> name##Info(                 \
+      Isolate* isolate,                                   \
+      PropertyAttributes attributes);
+  ACCESSOR_INFO_LIST(ACCESSOR_INFO_DECLARATION)
+#undef ACCESSOR_INFO_DECLARATION
+
   enum DescriptorId {
 #define ACCESSOR_DESCRIPTOR_DECLARATION(name) \
     k##name,
   ACCESSOR_DESCRIPTOR_LIST(ACCESSOR_DESCRIPTOR_DECLARATION)
 #undef ACCESSOR_DESCRIPTOR_DECLARATION
+#define ACCESSOR_INFO_DECLARATION(name) \
+    k##name##Getter, \
+    k##name##Setter,
+  ACCESSOR_INFO_LIST(ACCESSOR_INFO_DECLARATION)
+#undef ACCESSOR_INFO_DECLARATION
     descriptorCount
   };
 
@@ -92,7 +113,6 @@ class Accessors : public AllStatic {
                                       Handle<String> name,
                                       int* object_offset);
 
-
  private:
   // Accessor functions only used through the descriptor.
   static MaybeObject* FunctionSetPrototype(Isolate* isolate,

src/bootstrapper.cc

@@ -911,10 +911,10 @@ void Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
         Handle<Map>(native_context()->string_function()->initial_map());
     Map::EnsureDescriptorSlack(string_map, 1);
 
-    Handle<Foreign> string_length(
-        factory->NewForeign(&Accessors::StringLength));
     PropertyAttributes attribs = static_cast<PropertyAttributes>(
         DONT_ENUM | DONT_DELETE | READ_ONLY);
+    Handle<AccessorInfo> string_length(
+        Accessors::StringLengthInfo(isolate, attribs));
 
     {  // Add length.
       CallbacksDescriptor d(factory->length_string(), string_length, attribs);

src/objects.cc

@@ -419,10 +419,9 @@ MaybeHandle<Object> JSObject::GetPropertyWithCallback(Handle<JSObject> object,
         v8::ToCData<v8::AccessorGetterCallback>(data->getter());
     if (call_fun == NULL) return isolate->factory()->undefined_value();
 
-    Handle<JSObject> self = Handle<JSObject>::cast(receiver);
     Handle<String> key = Handle<String>::cast(name);
-    LOG(isolate, ApiNamedPropertyAccess("load", *self, *name));
-    PropertyCallbackArguments args(isolate, data->data(), *self, *object);
+    LOG(isolate, ApiNamedPropertyAccess("load", *object, *name));
+    PropertyCallbackArguments args(isolate, data->data(), *receiver, *object);
     v8::Handle<v8::Value> result =
         args.Call(call_fun, v8::Utils::ToLocal(key));
     RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
@@ -2884,8 +2883,7 @@ MaybeHandle<Object> JSObject::SetPropertyWithCallback(Handle<JSObject> object,
     if (call_fun == NULL) return value;
     Handle<String> key = Handle<String>::cast(name);
     LOG(isolate, ApiNamedPropertyAccess("store", *object, *name));
-    PropertyCallbackArguments args(
-        isolate, data->data(), *object, JSObject::cast(*holder));
+    PropertyCallbackArguments args(isolate, data->data(), *object, *holder);
     args.Call(call_fun,
               v8::Utils::ToLocal(key),
               v8::Utils::ToLocal(value));
@@ -12137,13 +12135,12 @@ MaybeHandle<Object> JSObject::GetElementWithCallback(
     v8::AccessorGetterCallback call_fun =
         v8::ToCData<v8::AccessorGetterCallback>(fun_obj);
     if (call_fun == NULL) return isolate->factory()->undefined_value();
-    Handle<JSObject> self = Handle<JSObject>::cast(receiver);
     Handle<JSObject> holder_handle = Handle<JSObject>::cast(holder);
     Handle<Object> number = isolate->factory()->NewNumberFromUint(index);
     Handle<String> key = isolate->factory()->NumberToString(number);
-    LOG(isolate, ApiNamedPropertyAccess("load", *self, *key));
+    LOG(isolate, ApiNamedPropertyAccess("load", *holder_handle, *key));
     PropertyCallbackArguments
-        args(isolate, data->data(), *self, *holder_handle);
+        args(isolate, data->data(), *receiver, *holder_handle);
     v8::Handle<v8::Value> result = args.Call(call_fun, v8::Utils::ToLocal(key));
     RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
     if (result.IsEmpty()) return isolate->factory()->undefined_value();

src/serialize.cc

@@ -276,10 +276,21 @@ void ExternalReferenceTable::PopulateTable(Isolate* isolate) {
       ACCESSOR, \
       Accessors::k##name, \
       "Accessors::" #name);
-
   ACCESSOR_DESCRIPTOR_LIST(ACCESSOR_DESCRIPTOR_DECLARATION)
 #undef ACCESSOR_DESCRIPTOR_DECLARATION
 
+#define ACCESSOR_INFO_DECLARATION(name) \
+  Add(FUNCTION_ADDR(&Accessors::name##Getter), \
+      ACCESSOR, \
+      Accessors::k##name##Getter, \
+      "Accessors::" #name "Getter"); \
+  Add(FUNCTION_ADDR(&Accessors::name##Setter), \
+      ACCESSOR, \
+      Accessors::k##name##Setter, \
+      "Accessors::" #name "Setter");
+  ACCESSOR_INFO_LIST(ACCESSOR_INFO_DECLARATION)
+#undef ACCESSOR_INFO_DECLARATION
+
   StubCache* stub_cache = isolate->stub_cache();
 
   // Stub cache tables