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#include "config.h" 27#include "DFGPredictionInjectionPhase.h" 28 29#if ENABLE(DFG_JIT) 30 31#include "DFGBasicBlockInlines.h" 32#include "DFGGraph.h" 33#include "DFGPhase.h" 34#include "Operations.h" 35 36namespace JSC { namespace DFG { 37 38class PredictionInjectionPhase : public Phase { 39public: 40 PredictionInjectionPhase(Graph& graph) 41 : Phase(graph, "prediction injection") 42 { 43 } 44 45 bool run() 46 { 47 ASSERT(m_graph.m_form == ThreadedCPS); 48 ASSERT(m_graph.m_unificationState == GloballyUnified); 49 50 ASSERT(codeBlock()->numParameters() >= 1); 51 for (size_t arg = 0; arg < static_cast<size_t>(codeBlock()->numParameters()); ++arg) { 52 ValueProfile* profile = profiledBlock()->valueProfileForArgument(arg); 53 if (!profile) 54 continue; 55 56 m_graph.m_arguments[arg]->variableAccessData()->predict(profile->computeUpdatedPrediction()); 57 58#if DFG_ENABLE(DEBUG_VERBOSE) 59 dataLog( 60 "Argument [", arg, "] prediction: ", 61 SpeculationDump(m_graph.m_arguments[arg]->variableAccessData()->prediction()), "\n"); 62#endif 63 } 64 65 for (BlockIndex blockIndex = 0; blockIndex < m_graph.m_blocks.size(); ++blockIndex) { 66 BasicBlock* block = m_graph.m_blocks[blockIndex].get(); 67 if (!block) 68 continue; 69 if (!block->isOSRTarget) 70 continue; 71 if (block->bytecodeBegin != m_graph.m_osrEntryBytecodeIndex) 72 continue; 73 for (size_t i = 0; i < m_graph.m_mustHandleValues.size(); ++i) { 74 Node* node = block->variablesAtHead.operand( 75 m_graph.m_mustHandleValues.operandForIndex(i)); 76 if (!node) 77 continue; 78 ASSERT(node->hasLocal()); 79 node->variableAccessData()->predict( 80 speculationFromValue(m_graph.m_mustHandleValues[i])); 81 } 82 } 83 84 return true; 85 } 86}; 87 88bool performPredictionInjection(Graph& graph) 89{ 90 SamplingRegion samplingRegion("DFG Prediction Injection Phase"); 91 return runPhase<PredictionInjectionPhase>(graph); 92} 93 94} } // namespace JSC::DFG 95 96#endif // ENABLE(DFG_JIT) 97 98