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/*
* Copyright (C) 2021-2022 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.
*/
#pragma once
#include "JSExportMacros.h"
#if ENABLE(LIBPAS_JIT_HEAP) && ENABLE(JIT)
#include <wtf/CodePtr.h>
#include <wtf/ThreadSafeRefCounted.h>
#else
#include <wtf/MetaAllocatorHandle.h>
#endif
#if !USE(SYSTEM_MALLOC)
#include <bmalloc/BPlatform.h>
#if BENABLE(LIBPAS) && (OS(DARWIN) || OS(LINUX))
#define ENABLE_LIBPAS_JIT_HEAP 1
#endif
#endif
namespace JSC {
#if ENABLE(LIBPAS_JIT_HEAP) && ENABLE(JIT)
DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(ExecutableMemoryHandle);
class ExecutableMemoryHandle : public ThreadSafeRefCounted<ExecutableMemoryHandle> {
WTF_MAKE_FAST_COMPACT_ALLOCATED_WITH_HEAP_IDENTIFIER(ExecutableMemoryHandle);
public:
using MemoryPtr = CodePtr<WTF::HandleMemoryPtrTag>;
// Don't call this directly - for proper accounting it's necessary to call
// ExecutableAllocator::allocate().
JS_EXPORT_PRIVATE static RefPtr<ExecutableMemoryHandle> createImpl(size_t sizeInBytes);
JS_EXPORT_PRIVATE ~ExecutableMemoryHandle();
MemoryPtr start() const
{
return m_start;
}
MemoryPtr end() const
{
return MemoryPtr::fromUntaggedPtr(reinterpret_cast<void*>(endAsInteger()));
}
uintptr_t startAsInteger() const
{
return m_start.untaggedPtr<uintptr_t>();
}
uintptr_t endAsInteger() const
{
return startAsInteger() + sizeInBytes();
}
size_t sizeInBytes() const { return m_sizeInBytes; }
bool containsIntegerAddress(uintptr_t address) const
{
uintptr_t startAddress = startAsInteger();
uintptr_t endAddress = startAddress + sizeInBytes();
return address >= startAddress && address < endAddress;
}
bool contains(void* address) const
{
return containsIntegerAddress(reinterpret_cast<uintptr_t>(address));
}
JS_EXPORT_PRIVATE void shrink(size_t newSizeInBytes);
void* key() const
{
return m_start.untaggedPtr();
}
void dump(PrintStream& out) const
{
out.print(RawPointer(key()));
}
private:
ExecutableMemoryHandle(MemoryPtr start, size_t sizeInBytes)
: m_sizeInBytes(sizeInBytes)
, m_start(start)
{
ASSERT(sizeInBytes == m_sizeInBytes); // executable memory region does not exceed 4GB.
}
unsigned m_sizeInBytes;
MemoryPtr m_start;
};
#else // not (ENABLE(LIBPAS_JIT_HEAP) && ENABLE(JIT))
typedef WTF::MetaAllocatorHandle ExecutableMemoryHandle;
#endif // ENABLE(LIBPAS_JIT_HEAP) && ENABLE(JIT)
} // namespace JSC
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