1/* 2 * Copyright (C) 2014 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#include "config.h" 27#include "FTLDataSection.h" 28 29#if ENABLE(FTL_JIT) 30 31#include <wtf/Assertions.h> 32#include <wtf/DataLog.h> 33#include <wtf/FastMalloc.h> 34 35namespace JSC { namespace FTL { 36 37DataSection::DataSection(size_t size, unsigned alignment) 38 : m_size(size) 39{ 40 RELEASE_ASSERT(WTF::bitCount(alignment) == 1); 41 42 const unsigned nativeAlignment = 8; 43 44 alignment = std::max(nativeAlignment, alignment); 45 46 size_t allocatedSize = size + alignment - nativeAlignment; 47 m_allocationBase = fastMalloc(allocatedSize); 48 49 m_base = bitwise_cast<void*>( 50 (bitwise_cast<uintptr_t>(m_allocationBase) + alignment - 1) & ~static_cast<uintptr_t>(alignment - 1)); 51 52 RELEASE_ASSERT(!(bitwise_cast<uintptr_t>(m_base) & (alignment - 1))); 53 RELEASE_ASSERT(bitwise_cast<uintptr_t>(m_base) + size <= bitwise_cast<uintptr_t>(m_allocationBase) + allocatedSize); 54} 55 56DataSection::~DataSection() 57{ 58 fastFree(m_allocationBase); 59} 60 61} } // namespace JSC::FTL 62 63#endif // ENABLE(FTL_JIT) 64 65