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/*
* Copyright (C) 2008, 2012 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 AssemblerBuffer_h
#define AssemblerBuffer_h
#if ENABLE(ASSEMBLER)
#include "ExecutableAllocator.h"
#include "JITCompilationEffort.h"
#include "VM.h"
#include "stdint.h"
#include <string.h>
#include <wtf/Assertions.h>
#include <wtf/FastMalloc.h>
#include <wtf/StdLibExtras.h>
namespace JSC {
struct AssemblerLabel {
AssemblerLabel()
: m_offset(std::numeric_limits<uint32_t>::max())
{
}
explicit AssemblerLabel(uint32_t offset)
: m_offset(offset)
{
}
bool isSet() const { return (m_offset != std::numeric_limits<uint32_t>::max()); }
AssemblerLabel labelAtOffset(int offset) const
{
return AssemblerLabel(m_offset + offset);
}
uint32_t m_offset;
};
class AssemblerBuffer {
static const int inlineCapacity = 128;
public:
AssemblerBuffer()
: m_storage(inlineCapacity)
, m_buffer(m_storage.begin())
, m_capacity(inlineCapacity)
, m_index(0)
{
}
~AssemblerBuffer()
{
}
bool isAvailable(int space)
{
return m_index + space <= m_capacity;
}
void ensureSpace(int space)
{
if (!isAvailable(space))
grow();
}
bool isAligned(int alignment) const
{
return !(m_index & (alignment - 1));
}
template<typename IntegralType>
void putIntegral(IntegralType value)
{
ensureSpace(sizeof(IntegralType));
putIntegralUnchecked(value);
}
template<typename IntegralType>
void putIntegralUnchecked(IntegralType value)
{
ASSERT(isAvailable(sizeof(IntegralType)));
*reinterpret_cast_ptr<IntegralType*>(m_buffer + m_index) = value;
m_index += sizeof(IntegralType);
}
void putByteUnchecked(int8_t value) { putIntegralUnchecked(value); }
void putByte(int8_t value) { putIntegral(value); }
void putShortUnchecked(int16_t value) { putIntegralUnchecked(value); }
void putShort(int16_t value) { putIntegral(value); }
void putIntUnchecked(int32_t value) { putIntegralUnchecked(value); }
void putInt(int32_t value) { putIntegral(value); }
void putInt64Unchecked(int64_t value) { putIntegralUnchecked(value); }
void putInt64(int64_t value) { putIntegral(value); }
void* data() const
{
return m_buffer;
}
size_t codeSize() const
{
return m_index;
}
AssemblerLabel label() const
{
return AssemblerLabel(m_index);
}
PassRefPtr<ExecutableMemoryHandle> executableCopy(VM& vm, void* ownerUID, JITCompilationEffort effort)
{
if (!m_index)
return 0;
RefPtr<ExecutableMemoryHandle> result = vm.executableAllocator.allocate(vm, m_index, ownerUID, effort);
if (!result)
return 0;
ExecutableAllocator::makeWritable(result->start(), result->sizeInBytes());
memcpy(result->start(), m_buffer, m_index);
return result.release();
}
unsigned debugOffset() { return m_index; }
protected:
void append(const char* data, int size)
{
if (!isAvailable(size))
grow(size);
memcpy(m_buffer + m_index, data, size);
m_index += size;
}
void grow(int extraCapacity = 0)
{
m_capacity += m_capacity / 2 + extraCapacity;
m_storage.grow(m_capacity);
m_buffer = m_storage.begin();
}
private:
Vector<char, inlineCapacity, UnsafeVectorOverflow> m_storage;
char* m_buffer;
int m_capacity;
int m_index;
};
} // namespace JSC
#endif // ENABLE(ASSEMBLER)
#endif // AssemblerBuffer_h
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