1/* 2 * Copyright (C) 2013 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef RecursiveAllocationScope_h 27#define RecursiveAllocationScope_h 28 29#include "Heap.h" 30#include "VM.h" 31 32namespace JSC { 33 34class RecursiveAllocationScope { 35public: 36 RecursiveAllocationScope(Heap& heap) 37 : m_heap(heap) 38#ifndef NDEBUG 39 , m_savedObjectClass(heap.vm()->m_initializingObjectClass) 40#endif 41 { 42#ifndef NDEBUG 43 m_heap.vm()->m_initializingObjectClass = nullptr; 44#endif 45 m_heap.m_deferralDepth++; // Make sure that we don't GC. 46 } 47 48 ~RecursiveAllocationScope() 49 { 50 m_heap.m_deferralDepth--; // Decrement deferal manually so we don't GC when we do so since we are already GCing!. 51#ifndef NDEBUG 52 m_heap.vm()->m_initializingObjectClass = m_savedObjectClass; 53#endif 54 } 55 56private: 57 Heap& m_heap; 58#ifndef NDEBUG 59 const ClassInfo* m_savedObjectClass; 60#endif 61}; 62 63} 64 65#endif // RecursiveAllocationScope_h 66