mirror of
https://github.com/darlinghq/darling-WTF.git
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119 lines
3.8 KiB
C++
119 lines
3.8 KiB
C++
/*
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* Copyright (C) 2010 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef PageAllocation_h
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#define PageAllocation_h
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#include <wtf/Assertions.h>
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#include <wtf/OSAllocator.h>
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#include <wtf/PageBlock.h>
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#include <algorithm>
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#if OS(DARWIN)
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#include <mach/mach_init.h>
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#include <mach/vm_map.h>
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#endif
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#if OS(WINDOWS)
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#include <malloc.h>
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#include <windows.h>
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#endif
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#if HAVE(ERRNO_H)
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#include <errno.h>
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#endif
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#if HAVE(MMAP)
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#include <sys/mman.h>
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#include <unistd.h>
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#endif
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namespace WTF {
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/*
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PageAllocation
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The PageAllocation class provides a cross-platform memory allocation interface
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with similar capabilities to posix mmap/munmap. Memory is allocated by calling
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PageAllocation::allocate, and deallocated by calling deallocate on the
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PageAllocation object. The PageAllocation holds the allocation's base pointer
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and size.
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The allocate method is passed the size required (which must be a multiple of
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the system page size, which can be accessed using PageAllocation::pageSize).
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Callers may also optinally provide a flag indicating the usage (for use by
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system memory usage tracking tools, where implemented), and boolean values
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specifying the required protection (defaulting to writable, non-executable).
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*/
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class PageAllocation : private PageBlock {
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public:
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PageAllocation()
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{
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}
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using PageBlock::size;
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using PageBlock::base;
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#ifndef __clang__
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using PageBlock::operator bool;
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#else
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// FIXME: This is a workaround for <rdar://problem/8876150>, wherein Clang incorrectly emits an access
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// control warning when a client tries to use operator bool exposed above via "using PageBlock::operator bool".
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operator bool() const { return PageBlock::operator bool(); }
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#endif
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static PageAllocation allocate(size_t size, OSAllocator::Usage usage = OSAllocator::UnknownUsage, bool writable = true, bool executable = false)
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{
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ASSERT(isPageAligned(size));
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return PageAllocation(OSAllocator::reserveAndCommit(size, usage, writable, executable), size);
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}
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void deallocate()
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{
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// Clear base & size before calling release; if this is *inside* allocation
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// then we won't be able to clear then after deallocating the memory.
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PageAllocation tmp;
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std::swap(tmp, *this);
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ASSERT(tmp);
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ASSERT(!*this);
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OSAllocator::decommitAndRelease(tmp.base(), tmp.size());
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}
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private:
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PageAllocation(void* base, size_t size)
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: PageBlock(base, size, false)
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{
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}
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};
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} // namespace WTF
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using WTF::PageAllocation;
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#endif // PageAllocation_h
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