Thread-local store buffers, v2

runtime/vm/thread.h

 // Copyright (c) 2015, 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.
 
 #ifndef VM_THREAD_H_
 #define VM_THREAD_H_
 
 #include "vm/base_isolate.h"
 #include "vm/globals.h"
 #include "vm/os_thread.h"
+#include "vm/store_buffer.h"
 
 namespace dart {
 
 class CHA;
 class Isolate;
 
 // A VM thread; may be executing Dart code or performing helper tasks like
 // garbage collection or compilation. The Thread structure associated with
 // a thread is allocated by EnsureInit before entering an isolate, and destroyed
 // automatically when the underlying OS thread exits. NOTE: On Windows, CleanUp
@@ skipping 13 matching lines @@
   // Makes the current thread exit its isolate.
   static void ExitIsolate();
 
   // A VM thread other than the main mutator thread can enter an isolate as a
   // "helper" to gain limited concurrent access to the isolate. One example is
   // SweeperTask (which uses the class table, which is copy-on-write).
   // TODO(koda): Properly synchronize heap access to expand allowed operations.
   static void EnterIsolateAsHelper(Isolate* isolate);
   static void ExitIsolateAsHelper();
 
+  // Called when the current thread transitions from mutator to collector.
+  // Empties the store buffer block into the isolate.
+  // TODO(koda): Always run GC in separate thread.
+  static void PrepareForGC();
+
 #if defined(TARGET_OS_WINDOWS)
   // Clears the state of the current thread and frees the allocation.
   static void CleanUp();
 #endif
 
   // Called at VM startup.
   static void InitOnce();
 
   // The topmost zone used for allocation in this thread.
   Zone* zone() {
     return reinterpret_cast<BaseIsolate*>(isolate())->current_zone();
   }
 
   // The isolate that this thread is operating on, or NULL if none.
   Isolate* isolate() const { return isolate_; }
   static intptr_t isolate_offset() {
     return OFFSET_OF(Thread, isolate_);
   }
 
   // The (topmost) CHA for the compilation in the isolate of this thread.
   // TODO(23153): Move this out of Isolate/Thread.
   CHA* cha() const;
   void set_cha(CHA* value);
 
+  void StoreBufferAddObject(RawObject* obj);
+  void StoreBufferAddObjectGC(RawObject* obj);
+#if defined(TESTING)
+  bool StoreBufferContains(RawObject* obj) const {
+    return store_buffer_block_->Contains(obj);
+  }
+#endif
+  void StoreBufferBlockProcess(bool check_threshold);
+  static intptr_t store_buffer_block_offset() {
+    return OFFSET_OF(Thread, store_buffer_block_);
+  }
+
  private:
   static ThreadLocalKey thread_key_;
 
   Isolate* isolate_;
+  StoreBufferBlock* store_buffer_block_;
 
   Thread()
-      : isolate_(NULL) {}
+      : isolate_(NULL), store_buffer_block_(NULL) {}
 
   static void SetCurrent(Thread* current);
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 }  // namespace dart
 
 #endif  // VM_THREAD_H_