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/*
* Copyright (C) 2008 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 ExecutableAllocator_h
#define ExecutableAllocator_h
#include "JITCompilationEffort.h"
#include <stddef.h> // for ptrdiff_t
#include <limits>
#include <wtf/Assertions.h>
#include <wtf/MetaAllocatorHandle.h>
#include <wtf/MetaAllocator.h>
#include <wtf/PageAllocation.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/Vector.h>
#if OS(IOS)
#include <libkern/OSCacheControl.h>
#endif
#if OS(IOS) || OS(QNX)
#include <sys/mman.h>
#endif
#if CPU(MIPS) && OS(LINUX)
#include <sys/cachectl.h>
#endif
#if CPU(SH4) && OS(LINUX)
#include <asm/cachectl.h>
#include <asm/unistd.h>
#include <sys/syscall.h>
#include <unistd.h>
#endif
#if OS(WINCE)
// From pkfuncs.h (private header file from the Platform Builder)
#define CACHE_SYNC_ALL 0x07F
extern "C" __declspec(dllimport) void CacheRangeFlush(LPVOID pAddr, DWORD dwLength, DWORD dwFlags);
#endif
#define JIT_ALLOCATOR_LARGE_ALLOC_SIZE (pageSize() * 4)
#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
#define PROTECTION_FLAGS_RW (PROT_READ | PROT_WRITE)
#define PROTECTION_FLAGS_RX (PROT_READ | PROT_EXEC)
#define EXECUTABLE_POOL_WRITABLE false
#else
#define EXECUTABLE_POOL_WRITABLE true
#endif
namespace JSC {
class VM;
void releaseExecutableMemory(VM&);
static const unsigned jitAllocationGranule = 32;
inline size_t roundUpAllocationSize(size_t request, size_t granularity)
{
RELEASE_ASSERT((std::numeric_limits<size_t>::max() - granularity) > request);
// Round up to next page boundary
size_t size = request + (granularity - 1);
size = size & ~(granularity - 1);
ASSERT(size >= request);
return size;
}
}
namespace JSC {
typedef WTF::MetaAllocatorHandle ExecutableMemoryHandle;
#if ENABLE(ASSEMBLER)
#if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND)
class DemandExecutableAllocator;
#endif
#if ENABLE(EXECUTABLE_ALLOCATOR_FIXED)
#if CPU(ARM) || CPU(MIPS)
static const size_t fixedExecutableMemoryPoolSize = 16 * 1024 * 1024;
#elif CPU(X86_64) && !CPU(X32)
static const size_t fixedExecutableMemoryPoolSize = 1024 * 1024 * 1024;
#else
static const size_t fixedExecutableMemoryPoolSize = 32 * 1024 * 1024;
#endif
extern uintptr_t startOfFixedExecutableMemoryPool;
#endif
class ExecutableAllocator {
enum ProtectionSetting { Writable, Executable };
public:
ExecutableAllocator(VM&);
~ExecutableAllocator();
static void initializeAllocator();
bool isValid() const;
static bool underMemoryPressure();
static double memoryPressureMultiplier(size_t addedMemoryUsage);
#if ENABLE(META_ALLOCATOR_PROFILE)
static void dumpProfile();
#else
static void dumpProfile() { }
#endif
PassRefPtr<ExecutableMemoryHandle> allocate(VM&, size_t sizeInBytes, void* ownerUID, JITCompilationEffort);
#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
static void makeWritable(void* start, size_t size)
{
reprotectRegion(start, size, Writable);
}
static void makeExecutable(void* start, size_t size)
{
reprotectRegion(start, size, Executable);
}
#else
static void makeWritable(void*, size_t) {}
static void makeExecutable(void*, size_t) {}
#endif
static size_t committedByteCount();
private:
#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
static void reprotectRegion(void*, size_t, ProtectionSetting);
#if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND)
// We create a MetaAllocator for each JS global object.
OwnPtr<DemandExecutableAllocator> m_allocator;
DemandExecutableAllocator* allocator() { return m_allocator.get(); }
#endif
#endif
};
#endif // ENABLE(JIT) && ENABLE(ASSEMBLER)
} // namespace JSC
#endif // !defined(ExecutableAllocator)
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