1/* 2 * Copyright (C) 2009, 2011 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. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef HeapRootVisitor_h 27#define HeapRootVisitor_h 28 29#include "SlotVisitor.h" 30#include "SlotVisitorInlines.h" 31 32namespace JSC { 33 34 // Privileged class for marking JSValues directly. It is only safe to use 35 // this class to mark direct heap roots that are marked during every GC pass. 36 // All other references should be wrapped in WriteBarriers. 37 class HeapRootVisitor { 38 private: 39 friend class Heap; 40 HeapRootVisitor(SlotVisitor&); 41 42 public: 43 void visit(JSValue*); 44 void visit(JSValue*, size_t); 45 void visit(JSString**); 46 void visit(JSCell**); 47 48 SlotVisitor& visitor(); 49 50 private: 51 SlotVisitor& m_visitor; 52 }; 53 54 inline HeapRootVisitor::HeapRootVisitor(SlotVisitor& visitor) 55 : m_visitor(visitor) 56 { 57 } 58 59 inline void HeapRootVisitor::visit(JSValue* slot) 60 { 61 m_visitor.append(slot); 62 } 63 64 inline void HeapRootVisitor::visit(JSValue* slot, size_t count) 65 { 66 m_visitor.append(slot, count); 67 } 68 69 inline void HeapRootVisitor::visit(JSString** slot) 70 { 71 m_visitor.append(reinterpret_cast<JSCell**>(slot)); 72 } 73 74 inline void HeapRootVisitor::visit(JSCell** slot) 75 { 76 m_visitor.append(slot); 77 } 78 79 inline SlotVisitor& HeapRootVisitor::visitor() 80 { 81 return m_visitor; 82 } 83 84} // namespace JSC 85 86#endif // HeapRootVisitor_h 87