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/*
* Copyright (C) 2010 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 PageAllocation_h
#define PageAllocation_h
#include <wtf/UnusedParam.h>
#include <wtf/VMTags.h>
#if OS(SYMBIAN)
#include <e32std.h>
#endif
#if HAVE(MMAP)
#define PAGE_ALLOCATION_ALLOCATE_AT 1
#else
#define PAGE_ALLOCATION_ALLOCATE_AT 0
#endif
namespace WTF {
class PageAllocation {
public:
enum Usage {
UnknownUsage = -1,
FastMallocPages = VM_TAG_FOR_TCMALLOC_MEMORY,
JSGCHeapPages = VM_TAG_FOR_COLLECTOR_MEMORY,
JSVMStackPages = VM_TAG_FOR_REGISTERFILE_MEMORY,
JSJITCodePages = VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY,
};
PageAllocation()
: m_base(0)
, m_size(0)
#if OS(SYMBIAN)
, m_chunk(0)
#endif
{
}
// Create a PageAllocation object representing a sub-region of an existing allocation;
// deallocate should never be called on an object represnting a subregion, only on the
// initial allocation.
PageAllocation(void* base, size_t size, const PageAllocation& parent)
: m_base(base)
, m_size(size)
#if OS(SYMBIAN)
, m_chunk(parent.m_chunk)
#endif
{
#if defined(NDEBUG) && !OS(SYMBIAN)
UNUSED_PARAM(parent);
#endif
ASSERT(base >= parent.m_base);
ASSERT(size <= parent.m_size);
ASSERT(static_cast<char*>(base) + size <= static_cast<char*>(parent.m_base) + parent.m_size);
}
void* base() const { return m_base; }
size_t size() const { return m_size; }
bool operator!() const { return !m_base; }
bool commit(void*, size_t, bool writable = true, bool executable = false) const;
void decommit(void*, size_t) const;
void deallocate();
static PageAllocation allocate(size_t, Usage = UnknownUsage, bool writable = true, bool executable = false);
static PageAllocation reserve(size_t, Usage = UnknownUsage, bool writable = true, bool executable = false);
#if PAGE_ALLOCATION_ALLOCATE_AT
static PageAllocation allocateAt(void* address, bool fixed, size_t, Usage = UnknownUsage, bool writable = true, bool executable = false);
static PageAllocation reserveAt(void* address, bool fixed, size_t, Usage = UnknownUsage, bool writable = true, bool executable = false);
#endif
static size_t pagesize();
private:
#if OS(SYMBIAN)
PageAllocation(void* base, size_t size, RChunk* chunk)
: m_base(base)
, m_size(size)
, m_chunk(chunk)
{
}
#else
PageAllocation(void* base, size_t size)
: m_base(base)
, m_size(size)
{
}
#endif
void* m_base;
size_t m_size;
#if OS(SYMBIAN)
RChunk* m_chunk;
#endif
};
}
using WTF::PageAllocation;
#endif // PageAllocation_h
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