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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 AssemblerBuffer_h
#define AssemblerBuffer_h
#include <wtf/Platform.h>
#if ENABLE(ASSEMBLER)
#include "stdint.h"
#include <string.h>
#include <jit/ExecutableAllocator.h>
#include <wtf/Assertions.h>
#include <wtf/FastMalloc.h>
namespace JSC {
class AssemblerBuffer {
static const int inlineCapacity = 256;
public:
AssemblerBuffer()
: m_buffer(m_inlineBuffer)
, m_capacity(inlineCapacity)
, m_size(0)
{
}
~AssemblerBuffer()
{
if (m_buffer != m_inlineBuffer)
fastFree(m_buffer);
}
void ensureSpace(int space)
{
if (m_size > m_capacity - space)
grow();
}
bool isAligned(int alignment) const
{
return !(m_size & (alignment - 1));
}
void putByteUnchecked(int value)
{
ASSERT(!(m_size > m_capacity - 4));
m_buffer[m_size] = value;
m_size++;
}
void putByte(int value)
{
if (m_size > m_capacity - 4)
grow();
putByteUnchecked(value);
}
void putShortUnchecked(int value)
{
ASSERT(!(m_size > m_capacity - 4));
*reinterpret_cast<short*>(&m_buffer[m_size]) = value;
m_size += 2;
}
void putShort(int value)
{
if (m_size > m_capacity - 4)
grow();
putShortUnchecked(value);
}
void putIntUnchecked(int value)
{
ASSERT(!(m_size > m_capacity - 4));
*reinterpret_cast<int*>(&m_buffer[m_size]) = value;
m_size += 4;
}
void putInt64Unchecked(int64_t value)
{
ASSERT(!(m_size > m_capacity - 8));
*reinterpret_cast<int64_t*>(&m_buffer[m_size]) = value;
m_size += 8;
}
void putInt(int value)
{
if (m_size > m_capacity - 4)
grow();
putIntUnchecked(value);
}
void* data() const
{
return m_buffer;
}
int size() const
{
return m_size;
}
void* executableCopy(ExecutablePool* allocator)
{
if (!m_size)
return 0;
void* result = allocator->alloc(m_size);
if (!result)
return 0;
ExecutableAllocator::makeWritable(result, m_size);
return memcpy(result, m_buffer, m_size);
}
protected:
void append(const char* data, int size)
{
if (m_size > m_capacity - size)
grow(size);
memcpy(m_buffer + m_size, data, size);
m_size += size;
}
void grow(int extraCapacity = 0)
{
m_capacity += m_capacity / 2 + extraCapacity;
if (m_buffer == m_inlineBuffer) {
char* newBuffer = static_cast<char*>(fastMalloc(m_capacity));
m_buffer = static_cast<char*>(memcpy(newBuffer, m_buffer, m_size));
} else
m_buffer = static_cast<char*>(fastRealloc(m_buffer, m_capacity));
}
char m_inlineBuffer[inlineCapacity];
char* m_buffer;
int m_capacity;
int m_size;
};
} // namespace JSC
#endif // ENABLE(ASSEMBLER)
#endif // AssemblerBuffer_h
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