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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 "RegisterFileStack.h"
using namespace std;
namespace KJS {
RegisterFileStack::~RegisterFileStack()
{
ASSERT(m_stack.size() == 1 && m_stack[0]->size() == 0); // The stack shouldn't be destroyed during execution.
delete m_stack[0];
}
RegisterFile* RegisterFileStack::pushGlobalRegisterFile()
{
RegisterFile* current = this->current();
// Common case: Existing register file is not in use: re-use it.
if (!current->size()) {
current->setSafeForReentry(true);
return current;
}
// Slow case: Existing register file is in use: Create a nested
// register file with a copy of this register file's globals.
RegisterFile* lastGlobal = this->lastGlobal();
current = allocateRegisterFile(current->maxSize() - current->size(), this);
current->addGlobalSlots(lastGlobal->numGlobalSlots());
current->copyGlobals(lastGlobal);
m_globalBase = *current->basePointer();
return current;
}
void RegisterFileStack::popGlobalRegisterFile()
{
// Common case: This is the only register file: clear its call frames.
if (!hasPrevious()) {
current()->shrink(0);
return;
}
// Slow case: This is a nested register file: pop this register file and
// copy its globals to the previous register file.
RegisterFile* tmp = m_stack.last();
m_stack.removeLast();
ASSERT(tmp->isGlobal() || tmp->numGlobalSlots() == lastGlobal()->numGlobalSlots());
if (tmp->isGlobal()) {
RegisterFile* lastGlobal = this->lastGlobal();
lastGlobal->addGlobalSlots(tmp->numGlobalSlots() - lastGlobal->numGlobalSlots());
lastGlobal->copyGlobals(tmp);
m_globalBase = *lastGlobal->basePointer();
}
delete tmp;
}
RegisterFile* RegisterFileStack::pushFunctionRegisterFile()
{
return allocateRegisterFile(current()->maxSize() - current()->size());
}
void RegisterFileStack::popFunctionRegisterFile()
{
delete m_stack.last();
m_stack.removeLast();
}
RegisterFile* RegisterFileStack::allocateRegisterFile(size_t maxSize, RegisterFileStack* registerFileStack)
{
RegisterFile* registerFile = new RegisterFile(maxSize, registerFileStack);
m_stack.append(registerFile);
return registerFile;
}
} // namespace KJS
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