Use symbols instead of hidden properties for i18n markers.

Also refactor symbols in the root list.

R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/614083002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24345 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

include/v8.h

@@ -5904,7 +5904,7 @@ class Internals {
   static const int kNullValueRootIndex = 7;
   static const int kTrueValueRootIndex = 8;
   static const int kFalseValueRootIndex = 9;
-  static const int kEmptyStringRootIndex = 166;
+  static const int kEmptyStringRootIndex = 152;
 
   // The external allocation limit should be below 256 MB on all architectures
   // to avoid that resource-constrained embedders run low on memory.

src/factory.h

@@ -588,6 +588,14 @@ class Factory FINAL {
   INTERNALIZED_STRING_LIST(STRING_ACCESSOR)
 #undef STRING_ACCESSOR
 
+#define SYMBOL_ACCESSOR(name)                                   \
+  inline Handle<Symbol> name() {                                \
+    return Handle<Symbol>(bit_cast<Symbol**>(                   \
+        &isolate()->heap()->roots_[Heap::k##name##RootIndex])); \
+  }
+  PRIVATE_SYMBOL_LIST(SYMBOL_ACCESSOR)
+#undef SYMBOL_ACCESSOR
+
   inline void set_string_table(Handle<StringTable> table) {
     isolate()->heap()->set_string_table(*table);
   }

src/heap-snapshot-generator.cc

@@ -2164,6 +2164,9 @@ const char* V8HeapExplorer::GetStrongGcSubrootName(Object* object) {
 #define STRING_NAME(name, str) NAME_ENTRY(name)
     INTERNALIZED_STRING_LIST(STRING_NAME)
 #undef STRING_NAME
+#define SYMBOL_NAME(name) NAME_ENTRY(name)
+    PRIVATE_SYMBOL_LIST(SYMBOL_NAME)
+#undef SYMBOL_NAME
 #undef NAME_ENTRY
     CHECK(!strong_gc_subroot_names_.is_empty());
   }

src/heap/heap.cc

@@ -2868,20 +2868,10 @@ void Heap::CreateInitialObjects() {
   // Number of queued microtasks stored in Isolate::pending_microtask_count().
   set_microtask_queue(empty_fixed_array());
 
-  set_detailed_stack_trace_symbol(*factory->NewPrivateOwnSymbol());
-  set_elements_transition_symbol(*factory->NewPrivateOwnSymbol());
-  set_frozen_symbol(*factory->NewPrivateOwnSymbol());
-  set_megamorphic_symbol(*factory->NewPrivateOwnSymbol());
-  set_premonomorphic_symbol(*factory->NewPrivateOwnSymbol());
-  set_generic_symbol(*factory->NewPrivateOwnSymbol());
-  set_nonexistent_symbol(*factory->NewPrivateOwnSymbol());
-  set_normal_ic_symbol(*factory->NewPrivateOwnSymbol());
-  set_observed_symbol(*factory->NewPrivateOwnSymbol());
-  set_stack_trace_symbol(*factory->NewPrivateOwnSymbol());
-  set_uninitialized_symbol(*factory->NewPrivateOwnSymbol());
-  set_home_object_symbol(*factory->NewPrivateOwnSymbol());
-  set_promise_debug_marker_symbol(*factory->NewPrivateOwnSymbol());
-  set_promise_has_handler_symbol(*factory->NewPrivateOwnSymbol());
+#define SYMBOL_INIT(name) \
+  roots_[k##name##RootIndex] = *factory->NewPrivateOwnSymbol();
+  PRIVATE_SYMBOL_LIST(SYMBOL_INIT)
+#undef SYMBOL_INIT
 
   Handle<SeededNumberDictionary> slow_element_dictionary =
       SeededNumberDictionary::New(isolate(), 0, TENURED);

src/hydrogen-instructions.cc

@@ -2873,6 +2873,9 @@ bool HConstant::ImmortalImmovable() const {
       object_.IsKnownGlobal(heap->name##_map()) ||
       STRING_TYPE_LIST(STRING_TYPE)
 #undef STRING_TYPE
+#define SYMBOL(name) object_.IsKnownGlobal(heap->name()) ||
+      PRIVATE_SYMBOL_LIST(SYMBOL)
+#undef SYMBOL
       false;
 }
 

src/runtime/runtime-i18n.cc

@@ -233,9 +233,9 @@ RUNTIME_FUNCTION(Runtime_IsInitializedIntlObject) {
   if (!input->IsJSObject()) return isolate->heap()->false_value();
   Handle<JSObject> obj = Handle<JSObject>::cast(input);
 
-  Handle<String> marker = isolate->factory()->intl_initialized_marker_string();
-  Handle<Object> tag(obj->GetHiddenProperty(marker), isolate);
-  return isolate->heap()->ToBoolean(!tag->IsTheHole());
+  Handle<Symbol> marker = isolate->factory()->intl_initialized_marker_symbol();
+  Handle<Object> tag = JSObject::GetDataProperty(obj, marker);
+  return isolate->heap()->ToBoolean(!tag->IsUndefined());
 }
 
 
@@ -250,8 +250,8 @@ RUNTIME_FUNCTION(Runtime_IsInitializedIntlObjectOfType) {
   if (!input->IsJSObject()) return isolate->heap()->false_value();
   Handle<JSObject> obj = Handle<JSObject>::cast(input);
 
-  Handle<String> marker = isolate->factory()->intl_initialized_marker_string();
-  Handle<Object> tag(obj->GetHiddenProperty(marker), isolate);
+  Handle<Symbol> marker = isolate->factory()->intl_initialized_marker_symbol();
+  Handle<Object> tag = JSObject::GetDataProperty(obj, marker);
   return isolate->heap()->ToBoolean(tag->IsString() &&
                                     String::cast(*tag)->Equals(*expected_type));
 }
@@ -266,11 +266,11 @@ RUNTIME_FUNCTION(Runtime_MarkAsInitializedIntlObjectOfType) {
   CONVERT_ARG_HANDLE_CHECKED(String, type, 1);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, impl, 2);
 
-  Handle<String> marker = isolate->factory()->intl_initialized_marker_string();
-  JSObject::SetHiddenProperty(input, marker, type);
+  Handle<Symbol> marker = isolate->factory()->intl_initialized_marker_symbol();
+  JSObject::SetProperty(input, marker, type, STRICT).Assert();
 
-  marker = isolate->factory()->intl_impl_object_string();
-  JSObject::SetHiddenProperty(input, marker, impl);
+  marker = isolate->factory()->intl_impl_object_symbol();
+  JSObject::SetProperty(input, marker, impl, STRICT).Assert();
 
   return isolate->heap()->undefined_value();
 }
@@ -291,8 +291,9 @@ RUNTIME_FUNCTION(Runtime_GetImplFromInitializedIntlObject) {
 
   Handle<JSObject> obj = Handle<JSObject>::cast(input);
 
-  Handle<String> marker = isolate->factory()->intl_impl_object_string();
-  Handle<Object> impl(obj->GetHiddenProperty(marker), isolate);
+  Handle<Symbol> marker = isolate->factory()->intl_impl_object_symbol();
+
+  Handle<Object> impl = JSObject::GetDataProperty(obj, marker);
   if (impl->IsTheHole()) {
     Vector<Handle<Object> > arguments = HandleVector(&obj, 1);
     THROW_NEW_ERROR_RETURN_FAILURE(isolate,

src/runtime/runtime.cc

@@ -1040,18 +1040,6 @@ MaybeHandle<Object> Runtime::DeleteObjectProperty(Isolate* isolate,
 }
 
 
-RUNTIME_FUNCTION(Runtime_SetHiddenProperty) {
-  HandleScope scope(isolate);
-  RUNTIME_ASSERT(args.length() == 3);
-
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(String, key, 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
-  RUNTIME_ASSERT(key->IsUniqueName());
-  return *JSObject::SetHiddenProperty(object, key, value);
-}
-
-
 RUNTIME_FUNCTION(Runtime_AddNamedProperty) {
   HandleScope scope(isolate);
   RUNTIME_ASSERT(args.length() == 4);

src/runtime/runtime.h

@@ -256,7 +256,6 @@ namespace internal {
   F(DefineDataPropertyUnchecked, 4, 1)                 \
   F(DefineAccessorPropertyUnchecked, 5, 1)             \
   F(GetDataProperty, 2, 1)                             \
-  F(SetHiddenProperty, 3, 1)                           \
                                                        \
   /* Arrays */                                         \
   F(RemoveArrayHoles, 2, 1)                            \

test/mjsunit/test-hidden-string.js

-// Copyright 2014 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.
-
-// Flags: --allow-natives-syntax
-
-var o = {};
-%SetHiddenProperty(o, "test", 1);
-// Create non-internalized ""
-var empty = "a".substring(1, 1);
-assertEquals(undefined, o[empty]);