Reuse empty StoreBufferBlocks.

runtime/vm/isolate.h

 // 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.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/base_isolate.h"
 #include "vm/class_table.h"
 #include "vm/counters.h"
 #include "vm/handles.h"
 #include "vm/megamorphic_cache_table.h"
 #include "vm/metrics.h"
 #include "vm/random.h"
-#include "vm/store_buffer.h"
 #include "vm/tags.h"
 #include "vm/thread.h"
 #include "vm/os_thread.h"
 #include "vm/trace_buffer.h"
 #include "vm/timer.h"
 
 namespace dart {
 
 // Forward declarations.
 class AbstractType;
@@ skipping 41 matching lines @@
 class RawError;
 class RawFloat32x4;
 class RawInt32x4;
 class RawUserTag;
 class SampleBuffer;
 class SendPort;
 class ServiceIdZone;
 class Simulator;
 class StackResource;
 class StackZone;
+class StoreBuffer;
 class StubCode;
 class TypeArguments;
 class TypeParameter;
 class UserTag;
 
 
 class IsolateVisitor {
  public:
   IsolateVisitor() {}
   virtual ~IsolateVisitor() {}
@@ skipping 45 matching lines @@
   // Visit all object pointers.
   void VisitObjectPointers(ObjectPointerVisitor* visitor,
                            bool visit_prologue_weak_persistent_handles,
                            bool validate_frames);
 
   // Visits weak object pointers.
   void VisitWeakPersistentHandles(HandleVisitor* visitor,
                                   bool visit_prologue_weak_persistent_handles);
   void VisitPrologueWeakPersistentHandles(HandleVisitor* visitor);
 
-  StoreBuffer* store_buffer() { return &store_buffer_; }
+  StoreBuffer* store_buffer() { return store_buffer_; }
 
   ClassTable* class_table() { return &class_table_; }
   static intptr_t class_table_offset() {
     return OFFSET_OF(Isolate, class_table_);
   }
 
   MegamorphicCacheTable* megamorphic_cache_table() {
     return &megamorphic_cache_table_;
   }
 
@@ skipping 560 matching lines @@
   }
 
   void set_mutator_thread(Thread* thread) {
     mutator_thread_ = thread;
   }
 
   template<class T> T* AllocateReusableHandle();
 
   Thread* mutator_thread_;
   uword vm_tag_;
-  StoreBuffer store_buffer_;
+  StoreBuffer* store_buffer_;
   ClassTable class_table_;
   MegamorphicCacheTable megamorphic_cache_table_;
   Dart_MessageNotifyCallback message_notify_callback_;
   char* name_;
   char* debugger_name_;
   int64_t start_time_;
   Dart_Port main_port_;
   Dart_Port origin_id_;  // Isolates created by spawnFunc have some origin id.
   uint64_t pause_capability_;
   uint64_t terminate_capability_;
@@ skipping 255 matching lines @@
   intptr_t serialized_args_len_;
   uint8_t* serialized_message_;
   intptr_t serialized_message_len_;
   Isolate::Flags isolate_flags_;
   bool paused_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_