/* * 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 "Mutex.h" #include "Range.h" #include <malloc/malloc.h> #include <mutex> 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(std::lock_guard<Mutex>&); Zone(task_t, memory_reader_t, vm_address_t); void addRange(Range); FixedVector<Range, capacity>& ranges() { return m_ranges; } 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<Range, capacity> m_ranges; }; inline void Zone::addRange(Range range) { if (m_ranges.size() == m_ranges.capacity()) return; m_ranges.push(range); } } // namespace bmalloc #endif // Zone_h