Revert "Remove IsInitialized checks from inlined API functions."

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 2d21355d6008851421256b534211c7cb543ea1df..628c5d1af189516ed162f34363c6c9489278fa47 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -5301,6 +5301,7 @@ class Internals {
   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 kUndefinedValueRootIndex = 5;
@@ -5325,12 +5326,6 @@ class Internals {
   static const int kUndefinedOddballKind = 5;
   static const int kNullOddballKind = 3;
 
-#ifdef V8_ENABLE_CHECKS
-  static void CheckInitialized(v8::Isolate* isolate);
-#else
-  static void CheckInitialized(v8::Isolate* isolate) { }
-#endif
-
   V8_INLINE(static bool HasHeapObjectTag(internal::Object* value)) {
     return ((reinterpret_cast<intptr_t>(value) & kHeapObjectTagMask) ==
             kHeapObjectTag);
@@ -5364,6 +5359,11 @@ class Internals {
     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);
@@ -5939,7 +5939,7 @@ String* String::Cast(v8::Value* value) {
 Local<String> String::Empty(Isolate* isolate) {
   typedef internal::Object* S;
   typedef internal::Internals I;
-  I::CheckInitialized(isolate);
+  if (!I::IsInitialized(isolate)) return Empty();
   S* slot = I::GetRoot(isolate, I::kEmptyStringRootIndex);
   return Local<String>(reinterpret_cast<String*>(slot));
 }
@@ -6292,7 +6292,7 @@ ReturnValue<T> PropertyCallbackInfo<T>::GetReturnValue() const {
 Handle<Primitive> Undefined(Isolate* isolate) {
   typedef internal::Object* S;
   typedef internal::Internals I;
-  I::CheckInitialized(isolate);
+  if (!I::IsInitialized(isolate)) return Undefined();
   S* slot = I::GetRoot(isolate, I::kUndefinedValueRootIndex);
   return Handle<Primitive>(reinterpret_cast<Primitive*>(slot));
 }
@@ -6301,7 +6301,7 @@ Handle<Primitive> Undefined(Isolate* isolate) {
 Handle<Primitive> Null(Isolate* isolate) {
   typedef internal::Object* S;
   typedef internal::Internals I;
-  I::CheckInitialized(isolate);
+  if (!I::IsInitialized(isolate)) return Null();
   S* slot = I::GetRoot(isolate, I::kNullValueRootIndex);
   return Handle<Primitive>(reinterpret_cast<Primitive*>(slot));
 }
@@ -6310,7 +6310,7 @@ Handle<Primitive> Null(Isolate* isolate) {
 Handle<Boolean> True(Isolate* isolate) {
   typedef internal::Object* S;
   typedef internal::Internals I;
-  I::CheckInitialized(isolate);
+  if (!I::IsInitialized(isolate)) return True();
   S* slot = I::GetRoot(isolate, I::kTrueValueRootIndex);
   return Handle<Boolean>(reinterpret_cast<Boolean*>(slot));
 }
@@ -6319,7 +6319,7 @@ Handle<Boolean> True(Isolate* isolate) {
 Handle<Boolean> False(Isolate* isolate) {
   typedef internal::Object* S;
   typedef internal::Internals I;
-  I::CheckInitialized(isolate);
+  if (!I::IsInitialized(isolate)) return False();
   S* slot = I::GetRoot(isolate, I::kFalseValueRootIndex);
   return Handle<Boolean>(reinterpret_cast<Boolean*>(slot));
 }