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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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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.
*/
#include "config.h"
#include "RegisterFile.h"
#include "RegisterFileStack.h"
#include "Register.h"
using namespace std;
namespace KJS {
size_t RegisterFile::newBuffer(size_t size, size_t capacity, size_t minCapacity, size_t maxSize, size_t offset)
{
capacity = (max(minCapacity, min(maxSize, max<size_t>(16, capacity + capacity / 4 + 1))));
Register* newBuffer = static_cast<Register*>(fastCalloc(capacity, sizeof(Register))); // zero-filled memory
if (m_buffer)
memcpy(newBuffer + offset, m_buffer, size * sizeof(Register));
setBuffer(newBuffer);
return capacity;
}
bool RegisterFile::growBuffer(size_t minCapacity, size_t maxSize)
{
if (minCapacity > m_maxSize)
return false;
size_t numGlobalSlots = this->numGlobalSlots();
size_t size = m_size + numGlobalSlots;
size_t capacity = m_capacity + numGlobalSlots;
minCapacity += numGlobalSlots;
capacity = newBuffer(size, capacity, minCapacity, maxSize, 0);
setBase(m_buffer + numGlobalSlots);
m_capacity = capacity - numGlobalSlots;
return true;
}
void RegisterFile::addGlobalSlots(size_t count)
{
if (!count)
return;
ASSERT(safeForReentry());
size_t numGlobalSlots = this->numGlobalSlots();
size_t size = m_size + numGlobalSlots;
size_t capacity = m_capacity + numGlobalSlots;
size_t minCapacity = size + count;
if (minCapacity < capacity)
memmove(m_buffer + count, m_buffer, size * sizeof(Register));
else
capacity = newBuffer(size, capacity, minCapacity, m_maxSize, count);
numGlobalSlots += count;
setBase(m_buffer + numGlobalSlots);
m_capacity = capacity - numGlobalSlots;
}
void RegisterFile::copyGlobals(RegisterFile* src)
{
ASSERT(src->numGlobalSlots() > 0); // Global code should always allocate at least a "this" slot.
size_t numSlotsToCopy = src->numGlobalSlots() - 1; // Don't propogate the nested "this" value back to the parent register file.
if (!numSlotsToCopy)
return;
memcpy(m_buffer, src->m_buffer, numSlotsToCopy * sizeof(Register));
}
void RegisterFile::setBase(Register* base)
{
m_base = base;
if (m_baseObserver)
m_baseObserver->baseChanged(this);
}
void RegisterFile::clear()
{
setBase(m_buffer);
m_size = 0;
}
} // namespace KJS
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