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. ``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 FTLLoweredNodeValue_h 27#define FTLLoweredNodeValue_h 28 29#if ENABLE(FTL_JIT) 30 31#include "DFGBasicBlock.h" 32#include "FTLAbbreviatedTypes.h" 33 34namespace JSC { namespace FTL { 35 36// Represents the act of having lowered a DFG::Node to an LValue, and records the 37// DFG::BasicBlock that did the lowering. The LValue is what we use most often, but 38// we need to verify that we're in a block that is dominated by the one that did 39// the lowering. We're guaranteed that for each DFG::Node, there will be one 40// LoweredNodeValue that always dominates all uses of the DFG::Node; but there may 41// be others that don't dominate and we're effectively doing opportunistic GVN on 42// the lowering code. 43 44class LoweredNodeValue { 45public: 46 LoweredNodeValue() 47 : m_value(0) 48 , m_block(0) 49 { 50 } 51 52 LoweredNodeValue(LValue value, DFG::BasicBlock* block) 53 : m_value(value) 54 , m_block(block) 55 { 56 ASSERT(m_value); 57 ASSERT(m_block); 58 } 59 60 bool isSet() const { return !!m_value; } 61 bool operator!() const { return !isSet(); } 62 63 LValue value() const { return m_value; } 64 DFG::BasicBlock* block() const { return m_block; } 65 66private: 67 LValue m_value; 68 DFG::BasicBlock* m_block; 69}; 70 71} } // namespace JSC::FTL 72 73#endif // ENABLE(FTL_JIT) 74 75#endif // FTLLoweredNodeValue_h 76 77