1 /* 2 * Copyright (C) 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. 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 #include "config.h" 27 #include "ConservativeRoots.h" 28 29 namespace JSC { 30 31 inline bool isPointerAligned(void* p) 32 { 33 return !((intptr_t)(p) & (sizeof(char*) - 1)); 34 } 35 36 void ConservativeRoots::grow() 37 { 38 size_t newCapacity = m_capacity == inlineCapacity ? nonInlineCapacity : m_capacity * 2; 39 JSCell** newRoots = static_cast<JSCell**>(OSAllocator::reserveAndCommit(newCapacity * sizeof(JSCell*))); 40 memcpy(newRoots, m_roots, m_size * sizeof(JSCell*)); 41 if (m_roots != m_inlineRoots) 42 OSAllocator::decommitAndRelease(m_roots, m_capacity * sizeof(JSCell*)); 43 m_capacity = newCapacity; 44 m_roots = newRoots; 45 } 46 47 void ConservativeRoots::add(void* begin, void* end) 48 { 49 ASSERT(begin <= end); 50 ASSERT((static_cast<char*>(end) - static_cast<char*>(begin)) < 0x1000000); 51 ASSERT(isPointerAligned(begin)); 52 ASSERT(isPointerAligned(end)); 53 54 for (char** it = static_cast<char**>(begin); it != static_cast<char**>(end); ++it) 55 add(*it); 56 } 57 58 } // namespace JSC 59
