Cache some global constants in Thread, to allow access via THR register.

runtime/vm/dart.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/dart.h"
 
 #include "vm/code_observers.h"
 #include "vm/cpu.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
@@ skipping 77 matching lines @@
                            Dart_FileCloseCallback file_close,
                            Dart_EntropySource entropy_source) {
   // TODO(iposva): Fix race condition here.
   if (vm_isolate_ != NULL || !Flags::Initialized()) {
     return "VM already initialized or flags not initialized.";
   }
   Isolate::SetFileCallbacks(file_open, file_read, file_write, file_close);
   Isolate::SetEntropySourceCallback(entropy_source);
   OS::InitOnce();
   VirtualMemory::InitOnce();
-  Thread::InitOnce();
+  Thread::InitOnceBeforeIsolate();
   Isolate::InitOnce();
   PortMap::InitOnce();
   FreeListElement::InitOnce();
   Api::InitOnce();
   CodeObservers::InitOnce();
   ThreadInterrupter::InitOnce();
   Profiler::InitOnce();
   SemiSpace::InitOnce();
   Metric::InitOnce();
   StoreBuffer::InitOnce();
 
 #if defined(USING_SIMULATOR)
   Simulator::InitOnce();
 #endif
   // Create the read-only handles area.
   ASSERT(predefined_handles_ == NULL);
   predefined_handles_ = new ReadOnlyHandles();
   // Create the VM isolate and finish the VM initialization.
   ASSERT(thread_pool_ == NULL);
   thread_pool_ = new ThreadPool();
   {
     ASSERT(vm_isolate_ == NULL);
     ASSERT(Flags::Initialized());
     const bool is_vm_isolate = true;
-    Thread::EnsureInit();
 
     // Setup default flags for the VM isolate.
     Isolate::Flags vm_flags;
     Dart_IsolateFlags api_flags;
     vm_flags.CopyTo(&api_flags);
     vm_isolate_ = Isolate::Init("vm-isolate", api_flags, is_vm_isolate);
 
     StackZone zone(vm_isolate_);
     HandleScope handle_scope(vm_isolate_);
     Heap::Init(vm_isolate_,
                0,  // New gen size 0; VM isolate should only allocate in old.
                FLAG_old_gen_heap_size * MBInWords,
                FLAG_external_max_size * MBInWords);
     Object::InitNull(vm_isolate_);
     ObjectStore::Init(vm_isolate_);
     TargetCPUFeatures::InitOnce();
     Object::InitOnce(vm_isolate_);
     ArgumentsDescriptor::InitOnce();
     StubCode::InitOnce();
+    Thread::InitOnceAfterObjectAndStubCode();
     // Now that the needed stub has been generated, set the stack limit.
     vm_isolate_->InitializeStackLimit();
     if (vm_isolate_snapshot != NULL) {
       const Snapshot* snapshot = Snapshot::SetupFromBuffer(vm_isolate_snapshot);
       if (snapshot == NULL) {
         return "Invalid vm isolate snapshot seen.";
       }
       ASSERT(snapshot->kind() == Snapshot::kFull);
       VmIsolateSnapshotReader reader(snapshot->content(),
                                      snapshot->length(),
@@ skipping 220 matching lines @@
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 
 bool Dart::IsReadOnlyApiHandle(Dart_Handle handle) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->api_handles_.IsValidHandle(handle);
 }
 
 }  // namespace dart