blob: 0d89d28278bce80a8a716edd3c788bfadc3d46f4 [file] [log] [blame]
/*
* 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<StaticMutex>&)
{
}
LargeRange VMHeap::tryAllocateLargeChunk(size_t alignment, size_t size, AllocationKind allocationKind)
{
// 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();
if (allocationKind == AllocationKind::Virtual)
vmDeallocatePhysicalPagesSloppy(memory, size);
Chunk* chunk = static_cast<Chunk*>(memory);
#if BOS(DARWIN)
PerProcess<Zone>::get()->addRange(Range(chunk->bytes(), size));
#endif
return LargeRange(chunk->bytes(), size, 0);
}
} // namespace bmalloc