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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_MARKER_H_
#define VM_GC_MARKER_H_
#include "vm/allocation.h"
#include "vm/os_thread.h" // Mutex.
namespace dart {
// Forward declarations.
class HandleVisitor;
class Heap;
class Isolate;
class ObjectPointerVisitor;
class PageSpace;
class RawWeakProperty;
// The class GCMarker is used to mark reachable old generation objects as part
// of the mark-sweep collection. The marking bit used is defined in RawObject.
class GCMarker : public ValueObject {
explicit GCMarker(Heap* heap)
: heap_(heap), marked_bytes_(0) { }
~GCMarker() { }
void MarkObjects(Isolate* isolate,
PageSpace* page_space,
bool invoke_api_callbacks,
bool collect_code);
intptr_t marked_words() { return marked_bytes_ >> kWordSizeLog2; }
void Prologue(Isolate* isolate, bool invoke_api_callbacks);
void Epilogue(Isolate* isolate, bool invoke_api_callbacks);
void IterateRoots(Isolate* isolate,
ObjectPointerVisitor* visitor,
bool visit_prologue_weak_persistent_handles,
intptr_t slice_index, intptr_t num_slices);
void IterateWeakRoots(Isolate* isolate,
HandleVisitor* visitor,
bool visit_prologue_weak_persistent_handles);
template<class MarkingVisitorType>
void IterateWeakReferences(Isolate* isolate, MarkingVisitorType* visitor);
void ProcessWeakTables(PageSpace* page_space);
void ProcessObjectIdTable(Isolate* isolate);
// Called by anyone: finalize and accumulate stats from 'visitor'.
template<class MarkingVisitorType>
void FinalizeResultsFrom(MarkingVisitorType* visitor);
Heap* heap_;
Mutex stats_mutex_;
// TODO(koda): Remove after verifying it's redundant w.r.t. ClassHeapStats.
uintptr_t marked_bytes_;
friend class MarkTask;
} // namespace dart
#endif // VM_GC_MARKER_H_