Revert "Use symbols instead of hidden properties for i18n markers."

This reverts r24345.

TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/618123005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24346 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 = 152;
+  static const int kEmptyStringRootIndex = 166;
 
   // 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

@@ -588,14 +588,6 @@ 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

@@ -2164,9 +2164,6 @@ 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

@@ -2868,10 +2868,20 @@ void Heap::CreateInitialObjects() {
   // Number of queued microtasks stored in Isolate::pending_microtask_count().
   set_microtask_queue(empty_fixed_array());
 
-#define SYMBOL_INIT(name) \
-  roots_[k##name##RootIndex] = *factory->NewPrivateOwnSymbol();
-  PRIVATE_SYMBOL_LIST(SYMBOL_INIT)
-#undef SYMBOL_INIT
+  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());
 
   Handle<SeededNumberDictionary> slow_element_dictionary =
       SeededNumberDictionary::New(isolate(), 0, TENURED);

src/heap/heap.h

@@ -175,8 +175,22 @@ namespace internal {
   V(JSObject, observation_state, ObservationState)                             \
   V(Map, external_map, ExternalMap)                                            \
   V(Object, symbol_registry, SymbolRegistry)                                   \
+  V(Symbol, frozen_symbol, FrozenSymbol)                                       \
+  V(Symbol, nonexistent_symbol, NonExistentSymbol)                             \
+  V(Symbol, elements_transition_symbol, ElementsTransitionSymbol)              \
   V(SeededNumberDictionary, empty_slow_element_dictionary,                     \
     EmptySlowElementDictionary)                                                \
+  V(Symbol, observed_symbol, ObservedSymbol)                                   \
+  V(Symbol, uninitialized_symbol, UninitializedSymbol)                         \
+  V(Symbol, megamorphic_symbol, MegamorphicSymbol)                             \
+  V(Symbol, premonomorphic_symbol, PremonomorphicSymbol)                       \
+  V(Symbol, generic_symbol, GenericSymbol)                                     \
+  V(Symbol, stack_trace_symbol, StackTraceSymbol)                              \
+  V(Symbol, detailed_stack_trace_symbol, DetailedStackTraceSymbol)             \
+  V(Symbol, normal_ic_symbol, NormalICSymbol)                                  \
+  V(Symbol, home_object_symbol, HomeObjectSymbol)                              \
+  V(Symbol, promise_debug_marker_symbol, PromiseDebugMarkerSymbol)             \
+  V(Symbol, promise_has_handler_symbol, PromiseHasHandlerSymbol)               \
   V(FixedArray, materialized_objects, MaterializedObjects)                     \
   V(FixedArray, allocation_sites_scratchpad, AllocationSitesScratchpad)        \
   V(FixedArray, microtask_queue, MicrotaskQueue)
@@ -321,25 +335,9 @@ namespace internal {
   V(value_string, "value")                                         \
   V(next_string, "next")                                           \
   V(byte_length_string, "byteLength")                              \
-  V(byte_offset_string, "byteOffset")
-
-#define PRIVATE_SYMBOL_LIST(V)      \
-  V(frozen_symbol)                  \
-  V(nonexistent_symbol)             \
-  V(elements_transition_symbol)     \
-  V(observed_symbol)                \
-  V(uninitialized_symbol)           \
-  V(megamorphic_symbol)             \
-  V(premonomorphic_symbol)          \
-  V(generic_symbol)                 \
-  V(stack_trace_symbol)             \
-  V(detailed_stack_trace_symbol)    \
-  V(normal_ic_symbol)               \
-  V(home_object_symbol)             \
-  V(intl_initialized_marker_symbol) \
-  V(intl_impl_object_symbol)        \
-  V(promise_debug_marker_symbol)    \
-  V(promise_has_handler_symbol)
+  V(byte_offset_string, "byteOffset")                              \
+  V(intl_initialized_marker_string, "v8::intl_initialized_marker") \
+  V(intl_impl_object_string, "v8::intl_object")
 
 // Forward declarations.
 class HeapStats;
@@ -787,11 +785,6 @@ class Heap {
   INTERNALIZED_STRING_LIST(STRING_ACCESSOR)
 #undef STRING_ACCESSOR
 
-#define SYMBOL_ACCESSOR(name) \
-  Symbol* name() { return Symbol::cast(roots_[k##name##RootIndex]); }
-  PRIVATE_SYMBOL_LIST(SYMBOL_ACCESSOR)
-#undef SYMBOL_ACCESSOR
-
   // The hidden_string is special because it is the empty string, but does
   // not match the empty string.
   String* hidden_string() { return hidden_string_; }
@@ -1069,10 +1062,6 @@ class Heap {
     INTERNALIZED_STRING_LIST(STRING_INDEX_DECLARATION)
 #undef STRING_DECLARATION
 
-#define SYMBOL_INDEX_DECLARATION(name) k##name##RootIndex,
-    PRIVATE_SYMBOL_LIST(SYMBOL_INDEX_DECLARATION)
-#undef SYMBOL_INDEX_DECLARATION
-
 // Utility type maps
 #define DECLARE_STRUCT_MAP(NAME, Name, name) k##Name##MapRootIndex,
     STRUCT_LIST(DECLARE_STRUCT_MAP)

src/hydrogen-instructions.cc

@@ -2873,9 +2873,6 @@ 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<Symbol> marker = isolate->factory()->intl_initialized_marker_symbol();
-  Handle<Object> tag = JSObject::GetDataProperty(obj, marker);
-  return isolate->heap()->ToBoolean(!tag->IsUndefined());
+  Handle<String> marker = isolate->factory()->intl_initialized_marker_string();
+  Handle<Object> tag(obj->GetHiddenProperty(marker), isolate);
+  return isolate->heap()->ToBoolean(!tag->IsTheHole());
 }
 
 
@@ -250,8 +250,8 @@ RUNTIME_FUNCTION(Runtime_IsInitializedIntlObjectOfType) {
   if (!input->IsJSObject()) return isolate->heap()->false_value();
   Handle<JSObject> obj = Handle<JSObject>::cast(input);
 
-  Handle<Symbol> marker = isolate->factory()->intl_initialized_marker_symbol();
-  Handle<Object> tag = JSObject::GetDataProperty(obj, marker);
+  Handle<String> marker = isolate->factory()->intl_initialized_marker_string();
+  Handle<Object> tag(obj->GetHiddenProperty(marker), isolate);
   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<Symbol> marker = isolate->factory()->intl_initialized_marker_symbol();
-  JSObject::SetProperty(input, marker, type, STRICT).Assert();
+  Handle<String> marker = isolate->factory()->intl_initialized_marker_string();
+  JSObject::SetHiddenProperty(input, marker, type);
 
-  marker = isolate->factory()->intl_impl_object_symbol();
-  JSObject::SetProperty(input, marker, impl, STRICT).Assert();
+  marker = isolate->factory()->intl_impl_object_string();
+  JSObject::SetHiddenProperty(input, marker, impl);
 
   return isolate->heap()->undefined_value();
 }
@@ -291,9 +291,8 @@ RUNTIME_FUNCTION(Runtime_GetImplFromInitializedIntlObject) {
 
   Handle<JSObject> obj = Handle<JSObject>::cast(input);
 
-  Handle<Symbol> marker = isolate->factory()->intl_impl_object_symbol();
-
-  Handle<Object> impl = JSObject::GetDataProperty(obj, marker);
+  Handle<String> marker = isolate->factory()->intl_impl_object_string();
+  Handle<Object> impl(obj->GetHiddenProperty(marker), isolate);
   if (impl->IsTheHole()) {
     Vector<Handle<Object> > arguments = HandleVector(&obj, 1);
     THROW_NEW_ERROR_RETURN_FAILURE(isolate,

src/runtime/runtime.cc

@@ -1040,6 +1040,18 @@ 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

@@ -256,6 +256,7 @@ 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]);