1 // Copyright 2011 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_STORE_BUFFER_H_ 6 #define V8_STORE_BUFFER_H_ 7 8 #include "src/allocation.h" 9 #include "src/base/logging.h" 10 #include "src/base/platform/platform.h" 11 #include "src/globals.h" 12 #include "src/heap/slot-set.h" 13 14 namespace v8 { 15 namespace internal { 16 17 // Intermediate buffer that accumulates old-to-new stores from the generated 18 // code. On buffer overflow the slots are moved to the remembered set. 19 class StoreBuffer { 20 public: 21 static const int kStoreBufferSize = 1 << (14 + kPointerSizeLog2); 22 static const int kStoreBufferMask = kStoreBufferSize - 1; 23 24 static void StoreBufferOverflow(Isolate* isolate); 25 26 explicit StoreBuffer(Heap* heap); 27 void SetUp(); 28 void TearDown(); 29 30 // Used to add entries from generated code. 31 inline Address* top_address() { return reinterpret_cast<Address*>(&top_); } 32 33 void MoveEntriesToRememberedSet(); 34 35 private: 36 Heap* heap_; 37 38 Address* top_; 39 40 // The start and the limit of the buffer that contains store slots 41 // added from the generated code. 42 Address* start_; 43 Address* limit_; 44 45 base::VirtualMemory* virtual_memory_; 46 }; 47 48 } // namespace internal 49 } // namespace v8 50 51 #endif // V8_STORE_BUFFER_H_ 52
