/* * Copyright (C) 2014-2017 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. */ #include "PerProcess.h" #include "VMHeap.h" #include <thread> namespace bmalloc { VMHeap::VMHeap(std::lock_guard<Mutex>&) { } LargeRange VMHeap::tryAllocateLargeChunk(size_t alignment, size_t size) { // We allocate VM in aligned multiples to increase the chances that // the OS will provide contiguous ranges that we can merge. size_t roundedAlignment = roundUpToMultipleOf<chunkSize>(alignment); if (roundedAlignment < alignment) // Check for overflow return LargeRange(); alignment = roundedAlignment; size_t roundedSize = roundUpToMultipleOf<chunkSize>(size); if (roundedSize < size) // Check for overflow return LargeRange(); size = roundedSize; void* memory = tryVMAllocate(alignment, size); if (!memory) return LargeRange(); Chunk* chunk = static_cast<Chunk*>(memory); #if BOS(DARWIN) PerProcess<Zone>::get()->addRange(Range(chunk->bytes(), size)); #endif return LargeRange(chunk->bytes(), size, 0, 0); } } // namespace bmalloc