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78 lines (63 loc) · 2.41 KB
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/*
* Copyright (C) 2010 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. 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 INC. 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.
*/
#ifndef LocalScope_h
#define LocalScope_h
#include "HandleStack.h"
#include "Local.h"
namespace JSC {
/*
A LocalScope is a temporary scope in which Locals are allocated. When a
LocalScope goes out of scope, all the Locals created in it are destroyed.
LocalScope is similar in concept to NSAutoreleasePool.
*/
class VM;
class LocalScope {
public:
explicit LocalScope(VM&);
~LocalScope();
template <typename T> Local<T> release(Local<T>); // Destroys all other locals in the scope.
private:
HandleStack* m_handleStack;
HandleStack::Frame m_lastFrame;
};
inline LocalScope::LocalScope(VM& vm)
: m_handleStack(vm.heap.handleStack())
{
m_handleStack->enterScope(m_lastFrame);
}
inline LocalScope::~LocalScope()
{
m_handleStack->leaveScope(m_lastFrame);
}
template <typename T> Local<T> LocalScope::release(Local<T> local)
{
typename Local<T>::ExternalType ptr = local.get();
m_handleStack->leaveScope(m_lastFrame);
HandleSlot slot = m_handleStack->push();
m_handleStack->enterScope(m_lastFrame);
return Local<T>(slot, ptr);
}
}
#endif