Revert "Removed default Isolate."

This reverts commit r21167, cctest/test-serialize has to be fixed first.

TBR=dcarney@chromium.org

Review URL: https://codereview.chromium.org/267163002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21170 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/api.cc

@@ -4958,6 +4958,12 @@ void v8::V8::SetArrayBufferAllocator(
 
 
 bool v8::V8::Dispose() {
+  i::Isolate* isolate = i::Isolate::Current();
+  if (!Utils::ApiCheck(isolate != NULL && isolate->IsDefaultIsolate(),
+                       "v8::V8::Dispose()",
+                       "Use v8::Isolate::Dispose() for non-default isolate.")) {
+    return false;
+  }
   i::V8::TearDown();
   return true;
 }

src/d8.cc

@@ -1659,7 +1659,7 @@ int Shell::Main(int argc, char* argv[]) {
     v8::V8::SetArrayBufferAllocator(&array_buffer_allocator);
   }
   int result = 0;
-  Isolate* isolate = Isolate::New();
+  Isolate* isolate = Isolate::GetCurrent();
 #ifndef V8_SHARED
   v8::ResourceConstraints constraints;
   constraints.ConfigureDefaults(i::OS::TotalPhysicalMemory(),
@@ -1669,7 +1669,6 @@ int Shell::Main(int argc, char* argv[]) {
 #endif
   DumbLineEditor dumb_line_editor(isolate);
   {
-    Isolate::Scope scope(isolate);
     Initialize(isolate);
 #ifdef ENABLE_VTUNE_JIT_INTERFACE
     vTune::InitializeVtuneForV8();

src/isolate.cc

@@ -103,6 +103,7 @@ v8::TryCatch* ThreadLocalTop::TryCatchHandler() {
 }
 
 
+Isolate* Isolate::default_isolate_ = NULL;
 Thread::LocalStorageKey Isolate::isolate_key_;
 Thread::LocalStorageKey Isolate::thread_id_key_;
 Thread::LocalStorageKey Isolate::per_isolate_thread_data_key_;
@@ -165,7 +166,7 @@ void Isolate::SetCrashIfDefaultIsolateInitialized() {
 void Isolate::EnsureDefaultIsolate() {
   LockGuard<Mutex> lock_guard(&process_wide_mutex_);
   CHECK(default_isolate_status_ != kDefaultIsolateCrashIfInitialized);
-  if (thread_data_table_ == NULL) {
+  if (default_isolate_ == NULL) {
     isolate_key_ = Thread::CreateThreadLocalKey();
     thread_id_key_ = Thread::CreateThreadLocalKey();
     per_isolate_thread_data_key_ = Thread::CreateThreadLocalKey();
@@ -173,6 +174,12 @@ void Isolate::EnsureDefaultIsolate() {
     PerThreadAssertScopeBase::thread_local_key = Thread::CreateThreadLocalKey();
 #endif  // DEBUG
     thread_data_table_ = new Isolate::ThreadDataTable();
+    default_isolate_ = new Isolate();
+  }
+  // Can't use SetIsolateThreadLocals(default_isolate_, NULL) here
+  // because a non-null thread data may be already set.
+  if (Thread::GetThreadLocal(isolate_key_) == NULL) {
+    Thread::SetThreadLocal(isolate_key_, default_isolate_);
   }
 }
 
@@ -1516,7 +1523,9 @@ void Isolate::TearDown() {
     serialize_partial_snapshot_cache_ = NULL;
   }
 
+  if (!IsDefaultIsolate()) {
     delete this;
+  }
 
   // Restore the previous current isolate.
   SetIsolateThreadLocals(saved_isolate, saved_data);

src/isolate.h

@@ -478,6 +478,8 @@ class Isolate {
 
   static void GlobalTearDown();
 
+  bool IsDefaultIsolate() const { return this == default_isolate_; }
+
   static void SetCrashIfDefaultIsolateInitialized();
   // Ensures that process-wide resources and the default isolate have been
   // allocated. It is only necessary to call this method in rare cases, for
@@ -1132,12 +1134,14 @@ class Isolate {
     DISALLOW_COPY_AND_ASSIGN(EntryStackItem);
   };
 
-  // This mutex protects highest_thread_id_ and thread_data_table_.
+  // This mutex protects highest_thread_id_, thread_data_table_ and
+  // default_isolate_.
   static Mutex process_wide_mutex_;
 
   static Thread::LocalStorageKey per_isolate_thread_data_key_;
   static Thread::LocalStorageKey isolate_key_;
   static Thread::LocalStorageKey thread_id_key_;
+  static Isolate* default_isolate_;
   static ThreadDataTable* thread_data_table_;
 
   // A global counter for all generated Isolates, might overflow.

src/log.cc

@@ -1936,12 +1936,16 @@ void Logger::LogAccessorCallbacks() {
 
 
 static void AddIsolateIdIfNeeded(Isolate* isolate, StringStream* stream) {
-  if (FLAG_logfile_per_isolate) stream->Add("isolate-%p-", isolate);
+  if (isolate->IsDefaultIsolate() || !FLAG_logfile_per_isolate) return;
+  stream->Add("isolate-%p-", isolate);
 }
 
 
 static SmartArrayPointer<const char> PrepareLogFileName(
     Isolate* isolate, const char* file_name) {
+  if (strchr(file_name, '%') != NULL || !isolate->IsDefaultIsolate()) {
+    // If there's a '%' in the log file name we have to expand
+    // placeholders.
     HeapStringAllocator allocator;
     StringStream stream(&allocator);
     AddIsolateIdIfNeeded(isolate, &stream);
@@ -1978,6 +1982,12 @@ static SmartArrayPointer<const char> PrepareLogFileName(
       }
     }
     return SmartArrayPointer<const char>(stream.ToCString());
+  }
+  int length = StrLength(file_name);
+  char* str = NewArray<char>(length + 1);
+  OS::MemCopy(str, file_name, length);
+  str[length] = '\0';
+  return SmartArrayPointer<const char>(str);
 }
 
 

src/mksnapshot.cc

@@ -393,10 +393,6 @@ int main(int argc, char** argv) {
 
   isolate->Exit();
   isolate->Dispose();
-  // TODO(svenpanne) Alas, we can't cleanly dispose V8 here, because
-  // Serializer::code_address_map_ is static (a.k.a. a global variable), and
-  // disposing that would involve accessing the Isolate just disposed.
-  // code_address_map_ really has to be an instance variable...
-  // V8::Dispose();
+  V8::Dispose();
   return 0;
 }

src/v8.cc

@@ -53,6 +53,16 @@ bool V8::Initialize(Deserializer* des) {
 
 
 void V8::TearDown() {
+  Isolate* isolate = Isolate::Current();
+  ASSERT(isolate->IsDefaultIsolate());
+  if (!isolate->IsInitialized()) return;
+
+  // The isolate has to be torn down before clearing the LOperand
+  // caches so that the optimizing compiler thread (if running)
+  // doesn't see an inconsistent view of the lithium instructions.
+  isolate->TearDown();
+  delete isolate;
+
   Bootstrapper::TearDownExtensions();
   ElementsAccessor::TearDown();
   LOperand::TearDownCaches();

test/cctest/cctest.cc

@@ -152,7 +152,6 @@ int main(int argc, char* argv[]) {
   i::TraceExtension trace_extension;
   v8::RegisterExtension(&trace_extension);
 
-  v8::V8::Initialize();
   int tests_run = 0;
   bool print_run_count = true;
   for (int i = 1; i < argc; i++) {

test/cctest/test-api.cc

@@ -19269,6 +19269,7 @@ TEST(IsolateNewDispose) {
   v8::Isolate* current_isolate = CcTest::isolate();
   v8::Isolate* isolate = v8::Isolate::New();
   CHECK(isolate != NULL);
+  CHECK(!reinterpret_cast<i::Isolate*>(isolate)->IsDefaultIsolate());
   CHECK(current_isolate != isolate);
   CHECK(current_isolate == CcTest::isolate());
 
@@ -22338,7 +22339,6 @@ TEST(EventLogging) {
 
 TEST(Promises) {
   i::FLAG_harmony_promises = true;
-  i::FLAG_harmony_weak_collections = true;  // Implied
 
   LocalContext context;
   v8::Isolate* isolate = context->GetIsolate();

test/cctest/test-microtask-delivery.cc

@@ -37,7 +37,6 @@ class HarmonyIsolate {
  public:
   HarmonyIsolate() {
     i::FLAG_harmony_promises = true;
-    i::FLAG_harmony_weak_collections = true;  // Implied
     isolate_ = Isolate::New();
     isolate_->Enter();
   }