Inline MarkIndependent(), MarkPartiallyDependent(), IsIndependent()

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4134 matching lines @@
   static const int kContextHeaderSize = 2 * kApiPointerSize;
   static const int kContextEmbedderDataIndex = 54;
   static const int kFullStringRepresentationMask = 0x07;
   static const int kStringEncodingMask = 0x4;
   static const int kExternalTwoByteRepresentationTag = 0x02;
   static const int kExternalAsciiRepresentationTag = 0x06;
 
   static const int kIsolateStateOffset = 0;
   static const int kIsolateEmbedderDataOffset = 1 * kApiPointerSize;
   static const int kIsolateRootsOffset = 3 * kApiPointerSize;
+  static const int kNodeFlagsOffset = 1 * kApiPointerSize + 3;
   static const int kUndefinedValueRootIndex = 5;
   static const int kNullValueRootIndex = 7;
   static const int kTrueValueRootIndex = 8;
   static const int kFalseValueRootIndex = 9;
   static const int kEmptySymbolRootIndex = 119;
 
+  static const int kNodeIsIndependentShift = 4;
+  static const int kNodeIsPartiallyDependentShift = 5;
+
   static const int kJSObjectType = 0xab;
   static const int kFirstNonstringType = 0x80;
   static const int kOddballType = 0x82;
   static const int kForeignType = 0x85;
 
   static const int kUndefinedOddballKind = 5;
   static const int kNullOddballKind = 3;
 
   V8_INLINE(static bool HasHeapObjectTag(internal::Object* value)) {
     return ((reinterpret_cast<intptr_t>(value) & kHeapObjectTagMask) ==
@@ skipping 18 matching lines @@
   V8_INLINE(static bool IsExternalTwoByteString(int instance_type)) {
     int representation = (instance_type & kFullStringRepresentationMask);
     return representation == kExternalTwoByteRepresentationTag;
   }
 
   V8_INLINE(static bool IsInitialized(v8::Isolate* isolate)) {
     uint8_t* addr = reinterpret_cast<uint8_t*>(isolate) + kIsolateStateOffset;
     return *reinterpret_cast<int*>(addr) == 1;
   }
 
+  V8_INLINE(static uint8_t GetNodeFlag(internal::Object** obj, int shift)) {
+      uint8_t* addr = reinterpret_cast<uint8_t*>(obj) + kNodeFlagsOffset;
+      return *addr & (1 << shift);
+  }
+
+  V8_INLINE(static void UpdateNodeFlag(internal::Object** obj,
+                                       bool value, int shift)) {
+      uint8_t* addr = reinterpret_cast<uint8_t*>(obj) + kNodeFlagsOffset;
+      uint8_t mask = 1 << shift;
+      *addr = (*addr & ~mask) | (value << shift);
+  }
+
   V8_INLINE(static void SetEmbedderData(v8::Isolate* isolate, void* data)) {
     uint8_t* addr = reinterpret_cast<uint8_t*>(isolate) +
         kIsolateEmbedderDataOffset;
     *reinterpret_cast<void**>(addr) = data;
   }
 
   V8_INLINE(static void* GetEmbedderData(v8::Isolate* isolate)) {
     uint8_t* addr = reinterpret_cast<uint8_t*>(isolate) +
         kIsolateEmbedderDataOffset;
     return *reinterpret_cast<void**>(addr);
@@ skipping 73 matching lines @@
 
 template <class T>
 bool Persistent<T>::IsIndependent() const {
   if (this->IsEmpty()) return false;
   return V8::IsGlobalIndependent(reinterpret_cast<internal::Object**>(**this));
 }
 
 
 template <class T>
 bool Persistent<T>::IsIndependent(Isolate* isolate) const {
+  typedef internal::Internals I;
   if (this->IsEmpty()) return false;
-  return V8::IsGlobalIndependent(reinterpret_cast<internal::Isolate*>(isolate),
-                                 reinterpret_cast<internal::Object**>(**this));
+  if (!I::IsInitialized(isolate)) return false;
+  return I::GetNodeFlag(reinterpret_cast<internal::Object**>(**this),
+                        I::kNodeIsIndependentShift);
 }
 
 
 template <class T>
 bool Persistent<T>::IsNearDeath() const {
   if (this->IsEmpty()) return false;
   return V8::IsGlobalNearDeath(reinterpret_cast<internal::Object**>(**this));
 }
 
 
@@ skipping 51 matching lines @@
   V8::ClearWeak(reinterpret_cast<internal::Object**>(**this));
 }
 
 template <class T>
 void Persistent<T>::MarkIndependent() {
   V8::MarkIndependent(reinterpret_cast<internal::Object**>(**this));
 }
 
 template <class T>
 void Persistent<T>::MarkIndependent(Isolate* isolate) {
-  V8::MarkIndependent(reinterpret_cast<internal::Isolate*>(isolate),
-                      reinterpret_cast<internal::Object**>(**this));
+  typedef internal::Internals I;
+  if (this->IsEmpty()) return;
+  if (!I::IsInitialized(isolate)) return;
+  I::UpdateNodeFlag(reinterpret_cast<internal::Object**>(**this),
+                    true, I::kNodeIsIndependentShift);
 }
 
 template <class T>
 void Persistent<T>::MarkPartiallyDependent() {
   V8::MarkPartiallyDependent(reinterpret_cast<internal::Object**>(**this));
 }
 
 template <class T>
 void Persistent<T>::MarkPartiallyDependent(Isolate* isolate) {
-  V8::MarkPartiallyDependent(reinterpret_cast<internal::Isolate*>(isolate),
-                             reinterpret_cast<internal::Object**>(**this));
+  typedef internal::Internals I;
+  if (this->IsEmpty()) return;
+  if (!I::IsInitialized(isolate)) return;
+  I::UpdateNodeFlag(reinterpret_cast<internal::Object**>(**this),
+                    true, I::kNodeIsPartiallyDependentShift);
 }
 
 template <class T>
 void Persistent<T>::SetWrapperClassId(uint16_t class_id) {
   V8::SetWrapperClassId(reinterpret_cast<internal::Object**>(**this), class_id);
 }
 
 template <class T>
 uint16_t Persistent<T>::WrapperClassId() const {
   return V8::GetWrapperClassId(reinterpret_cast<internal::Object**>(**this));
@@ skipping 416 matching lines @@
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_