dfg/DFGPredictionInjectionPhase.cpp

   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
  36 namespace JSC { namespace DFG {
  37
  38 class PredictionInjectionPhase : public Phase {
  39 public:
  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
  88 bool 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