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// Copyright (c) 2011, 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_GC_SWEEPER_H_
#define VM_GC_SWEEPER_H_
#include "vm/globals.h"
namespace dart {
// Forward declarations.
class FreeList;
class Heap;
class HeapPage;
class Isolate;
class PageSpace;
// The class GCSweeper is used to visit the heap after marking to reclaim unused
// memory.
class GCSweeper {
GCSweeper() {}
~GCSweeper() {}
// Sweep the memory area for the page while clearing the mark bits and adding
// all the unmarked objects to the freelist. Whether the freelist is
// pre-locked is indicated by the locked parameter.
// Returns true if the page is in use. Freelist is untouched if page is not
// in use.
bool SweepPage(HeapPage* page, FreeList* freelist, bool locked);
// Returns the number of words from page->object_start() to the end of the
// last marked object.
intptr_t SweepLargePage(HeapPage* page);
// Sweep the regular sized data pages between first and last inclusive.
static void SweepConcurrent(Isolate* isolate,
HeapPage* first,
HeapPage* last,
FreeList* freelist);
} // namespace dart
#endif // VM_GC_SWEEPER_H_