dfg/DFGInvalidationPointInjectionPhase.cpp

   1 /*
   2  * Copyright (C) 2013, 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 "DFGInvalidationPointInjectionPhase.h"
  28
  29 #if ENABLE(DFG_JIT)
  30
  31 #include "DFGBlockSetInlines.h"
  32 #include "DFGClobberize.h"
  33 #include "DFGGraph.h"
  34 #include "DFGInsertionSet.h"
  35 #include "DFGPhase.h"
  36 #include "JSCInlines.h"
  37
  38 namespace JSC { namespace DFG {
  39
  40 class InvalidationPointInjectionPhase : public Phase {
  41     static const bool verbose = false;
  42
  43 public:
  44     InvalidationPointInjectionPhase(Graph& graph)
  45         : Phase(graph, "invalidation point injection")
  46         , m_insertionSet(graph)
  47     {
  48     }
  49
  50     bool run()
  51     {
  52         ASSERT(m_graph.m_form != SSA);
  53
  54         BlockSet blocksThatNeedInvalidationPoints;
  55
  56         for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;) {
  57             BasicBlock* block = m_graph.block(blockIndex);
  58             if (!block)
  59                 continue;
  60
  61             for (unsigned nodeIndex = 0; nodeIndex < block->size(); ++nodeIndex)
  62                 handle(nodeIndex, block->at(nodeIndex));
  63
  64             // Note: this assumes that control flow occurs at bytecode instruction boundaries.
  65             if (m_originThatHadFire.isSet()) {
  66                 for (unsigned i = block->numSuccessors(); i--;)
  67                     blocksThatNeedInvalidationPoints.add(block->successor(i));
  68             }
  69
  70             m_insertionSet.execute(block);
  71         }
  72
  73         for (BasicBlock* block : blocksThatNeedInvalidationPoints.iterable(m_graph)) {
  74             insertInvalidationCheck(0, block->at(0));
  75             m_insertionSet.execute(block);
  76         }
  77
  78         return true;
  79     }
  80
  81 private:
  82     void handle(unsigned nodeIndex, Node* node)
  83     {
  84         if (m_originThatHadFire.isSet() && m_originThatHadFire != node->origin.forExit) {
  85             insertInvalidationCheck(nodeIndex, node);
  86             m_originThatHadFire = CodeOrigin();
  87         }
  88
  89         if (writesOverlap(m_graph, node, Watchpoint_fire))
  90             m_originThatHadFire = node->origin.forExit;
  91     }
  92
  93     void insertInvalidationCheck(unsigned nodeIndex, Node* node)
  94     {
  95         m_insertionSet.insertNode(nodeIndex, SpecNone, InvalidationPoint, node->origin);
  96     }
  97
  98     CodeOrigin m_originThatHadFire;
  99     InsertionSet m_insertionSet;
 100 };
 101
 102 bool performInvalidationPointInjection(Graph& graph)
 103 {
 104     SamplingRegion samplingRegion("DFG Invalidation Point Injection Phase");
 105     return runPhase<InvalidationPointInjectionPhase>(graph);
 106 }
 107
 108 } } // namespace JSC::DFG
 109
 110 #endif // ENABLE(DFG_JIT)
 111