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/*
* Copyright (C) 2014, 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef Zone_h
#define Zone_h
#include "FixedVector.h"
#include <malloc/malloc.h>
namespace bmalloc {
class Chunk;
class Zone : public malloc_zone_t {
public:
// Enough capacity to track a 64GB heap, so probably enough for anything.
static const size_t capacity = 2048;
Zone();
Zone(task_t, memory_reader_t, vm_address_t);
void addChunk(Chunk*);
FixedVector<Chunk*, capacity>& chunks() { return m_chunks; }
private:
// This vector has two purposes:
// (1) It stores the list of Chunks so that we can enumerate
// each Chunk and request that it be scanned if reachable.
// (2) It roots a pointer to each Chunk in a global non-malloc
// VM region, making each Chunk appear reachable, and therefore
// ensuring that the leaks tool will scan it. (The leaks tool
// conservatively scans all writeable VM regions that are not malloc
// regions, and then scans malloc regions using the introspection API.)
// This prevents the leaks tool from reporting false positive leaks for
// objects pointed to from bmalloc memory -- though it also prevents the
// leaks tool from finding any leaks in bmalloc memory.
FixedVector<Chunk*, capacity> m_chunks;
};
inline void Zone::addChunk(Chunk* chunk)
{
if (m_chunks.size() == m_chunks.capacity())
return;
m_chunks.push(chunk);
}
} // namespace bmalloc
#endif // Zone_h
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