heap/GCLogging.cpp

   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. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "GCLogging.h"
  28
  29 #include "ClassInfo.h"
  30 #include "Heap.h"
  31 #include "HeapIterationScope.h"
  32 #include "JSCell.h"
  33 #include "JSCellInlines.h"
  34
  35 namespace JSC {
  36
  37 const char* GCLogging::levelAsString(Level level)
  38 {
  39     switch (level) {
  40     case None:
  41         return "None";
  42     case Basic:
  43         return "Basic";
  44     case Verbose:
  45         return "Verbose";
  46     default:
  47         RELEASE_ASSERT_NOT_REACHED();
  48         return "";
  49     }
  50 }
  51
  52 class LoggingFunctor {
  53 public:
  54     LoggingFunctor(SlotVisitor& slotVisitor)
  55         : m_slotVisitor(slotVisitor)
  56     {
  57         m_savedMarkStack.resize(m_slotVisitor.markStack().size());
  58         m_slotVisitor.markStack().fillVector(m_savedMarkStack);
  59     }
  60
  61     ~LoggingFunctor()
  62     {
  63         reviveCells();
  64     }
  65
  66     void operator()(JSCell* cell)
  67     {
  68         m_liveCells.append(cell);
  69         MarkedBlock::blockFor(cell)->clearMarked(cell);
  70     }
  71
  72     void log()
  73     {
  74         m_slotVisitor.clearMarkStack();
  75         for (JSCell* cell : m_liveCells) {
  76             cell->methodTable()->visitChildren(cell, m_slotVisitor);
  77             dataLog("\n", *cell, ":\n", m_slotVisitor);
  78             for (const JSCell* neighbor : m_slotVisitor.markStack())
  79                 MarkedBlock::blockFor(neighbor)->clearMarked(neighbor);
  80             m_slotVisitor.clearMarkStack();
  81         }
  82         m_slotVisitor.reset();
  83     }
  84
  85     void reviveCells()
  86     {
  87         for (JSCell* cell : m_liveCells)
  88             MarkedBlock::blockFor(cell)->setMarked(cell);
  89
  90         for (const JSCell* cell : m_savedMarkStack) {
  91             m_slotVisitor.markStack().append(cell);
  92             const_cast<JSCell*>(cell)->setRemembered(true);
  93         }
  94     }
  95
  96     typedef void ReturnType;
  97
  98     void returnValue() { };
  99
 100 private:
 101     Vector<const JSCell*> m_savedMarkStack;
 102     Vector<JSCell*> m_liveCells;
 103     SlotVisitor& m_slotVisitor;
 104 };
 105
 106 void GCLogging::dumpObjectGraph(Heap* heap)
 107 {
 108     LoggingFunctor loggingFunctor(heap->m_slotVisitor);
 109     HeapIterationScope iterationScope(*heap);
 110     heap->objectSpace().forEachLiveCell(iterationScope, loggingFunctor);
 111     loggingFunctor.log();
 112 }
 113
 114 } // namespace JSC