1db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block/* 22bde8e466a4451c7319e3a072d118917957d6554Steve Block * Copyright (C) 2010 Apple Inc. All rights reserved. 3db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * 4db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * Redistribution and use in source and binary forms, with or without 5db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * modification, are permitted provided that the following conditions 6db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * are met: 7db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * 1. Redistributions of source code must retain the above copyright 8db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * notice, this list of conditions and the following disclaimer. 9db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * 2. Redistributions in binary form must reproduce the above copyright 10db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * notice, this list of conditions and the following disclaimer in the 11db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * documentation and/or other materials provided with the distribution. 12db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * 13db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block * THE POSSIBILITY OF SUCH DAMAGE. 24db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block */ 25db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block 262bde8e466a4451c7319e3a072d118917957d6554Steve Block#ifndef LocalScope_h 272bde8e466a4451c7319e3a072d118917957d6554Steve Block#define LocalScope_h 28dd8bb3de4f353a81954234999f1fea748aee2ea9Ben Murdoch 292bde8e466a4451c7319e3a072d118917957d6554Steve Block#include "HandleStack.h" 302bde8e466a4451c7319e3a072d118917957d6554Steve Block#include "Local.h" 3165f03d4f644ce73618e5f4f50dd694b26f55ae12Ben Murdoch 322bde8e466a4451c7319e3a072d118917957d6554Steve Blocknamespace JSC { 332bde8e466a4451c7319e3a072d118917957d6554Steve Block/* 342bde8e466a4451c7319e3a072d118917957d6554Steve Block A LocalScope is a temporary scope in which Locals are allocated. When a 352bde8e466a4451c7319e3a072d118917957d6554Steve Block LocalScope goes out of scope, all the Locals created in it are destroyed. 3665f03d4f644ce73618e5f4f50dd694b26f55ae12Ben Murdoch 372bde8e466a4451c7319e3a072d118917957d6554Steve Block LocalScope is similar in concept to NSAutoreleasePool. 382bde8e466a4451c7319e3a072d118917957d6554Steve Block*/ 392bde8e466a4451c7319e3a072d118917957d6554Steve Block 402bde8e466a4451c7319e3a072d118917957d6554Steve Blockclass JSGlobalData; 412bde8e466a4451c7319e3a072d118917957d6554Steve Block 422bde8e466a4451c7319e3a072d118917957d6554Steve Blockclass LocalScope { 432bde8e466a4451c7319e3a072d118917957d6554Steve Blockpublic: 442bde8e466a4451c7319e3a072d118917957d6554Steve Block explicit LocalScope(JSGlobalData&); 452bde8e466a4451c7319e3a072d118917957d6554Steve Block ~LocalScope(); 462bde8e466a4451c7319e3a072d118917957d6554Steve Block 472bde8e466a4451c7319e3a072d118917957d6554Steve Block template <typename T> Local<T> release(Local<T>); // Destroys all other locals in the scope. 482bde8e466a4451c7319e3a072d118917957d6554Steve Block 492bde8e466a4451c7319e3a072d118917957d6554Steve Blockprivate: 502bde8e466a4451c7319e3a072d118917957d6554Steve Block HandleStack* m_handleStack; 512bde8e466a4451c7319e3a072d118917957d6554Steve Block HandleStack::Frame m_lastFrame; 522bde8e466a4451c7319e3a072d118917957d6554Steve Block}; 532bde8e466a4451c7319e3a072d118917957d6554Steve Block 542bde8e466a4451c7319e3a072d118917957d6554Steve Blockinline LocalScope::LocalScope(JSGlobalData& globalData) 552bde8e466a4451c7319e3a072d118917957d6554Steve Block : m_handleStack(globalData.heap.handleStack()) 562bde8e466a4451c7319e3a072d118917957d6554Steve Block{ 572bde8e466a4451c7319e3a072d118917957d6554Steve Block m_handleStack->enterScope(m_lastFrame); 582bde8e466a4451c7319e3a072d118917957d6554Steve Block} 592bde8e466a4451c7319e3a072d118917957d6554Steve Block 602bde8e466a4451c7319e3a072d118917957d6554Steve Blockinline LocalScope::~LocalScope() 6165f03d4f644ce73618e5f4f50dd694b26f55ae12Ben Murdoch{ 622bde8e466a4451c7319e3a072d118917957d6554Steve Block m_handleStack->leaveScope(m_lastFrame); 632bde8e466a4451c7319e3a072d118917957d6554Steve Block} 642bde8e466a4451c7319e3a072d118917957d6554Steve Block 652bde8e466a4451c7319e3a072d118917957d6554Steve Blocktemplate <typename T> Local<T> LocalScope::release(Local<T> local) 662bde8e466a4451c7319e3a072d118917957d6554Steve Block{ 672bde8e466a4451c7319e3a072d118917957d6554Steve Block typename Local<T>::ExternalType ptr = local.get(); 682bde8e466a4451c7319e3a072d118917957d6554Steve Block 692bde8e466a4451c7319e3a072d118917957d6554Steve Block m_handleStack->leaveScope(m_lastFrame); 702bde8e466a4451c7319e3a072d118917957d6554Steve Block HandleSlot slot = m_handleStack->push(); 712bde8e466a4451c7319e3a072d118917957d6554Steve Block m_handleStack->enterScope(m_lastFrame); 722bde8e466a4451c7319e3a072d118917957d6554Steve Block 732bde8e466a4451c7319e3a072d118917957d6554Steve Block return Local<T>(slot, ptr); 742bde8e466a4451c7319e3a072d118917957d6554Steve Block} 752bde8e466a4451c7319e3a072d118917957d6554Steve Block 76dd8bb3de4f353a81954234999f1fea748aee2ea9Ben Murdoch} 77db14019a23d96bc8a444b6576a5da8bd1cfbc8b0Steve Block 782bde8e466a4451c7319e3a072d118917957d6554Steve Block#endif 79