heap/GCLogging.cpp

   1 /*
   2  * Copyright (C) 2014, 2015 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 #include <wtf/PrintStream.h>
  35
  36 namespace JSC {
  37
  38 const char* GCLogging::levelAsString(Level level)
  39 {
  40     switch (level) {
  41     case None:
  42         return "None";
  43     case Basic:
  44         return "Basic";
  45     case Verbose:
  46         return "Verbose";
  47     default:
  48         RELEASE_ASSERT_NOT_REACHED();
  49         return "";
  50     }
  51 }
  52
  53 class LoggingFunctor {
  54 public:
  55     LoggingFunctor(SlotVisitor& slotVisitor)
  56         : m_slotVisitor(slotVisitor)
  57     {
  58         m_savedMarkStack.resize(m_slotVisitor.markStack().size());
  59         m_slotVisitor.markStack().fillVector(m_savedMarkStack);
  60     }
  61
  62     ~LoggingFunctor()
  63     {
  64         reviveCells();
  65     }
  66
  67     IterationStatus operator()(JSCell* cell)
  68     {
  69         m_liveCells.append(cell);
  70         MarkedBlock::blockFor(cell)->clearMarked(cell);
  71         return IterationStatus::Continue;
  72     }
  73
  74     void log()
  75     {
  76         m_slotVisitor.clearMarkStack();
  77         for (JSCell* cell : m_liveCells) {
  78             cell->methodTable()->visitChildren(cell, m_slotVisitor);
  79             dataLog("\n", *cell, ":\n", m_slotVisitor);
  80             for (const JSCell* neighbor : m_slotVisitor.markStack())
  81                 MarkedBlock::blockFor(neighbor)->clearMarked(neighbor);
  82             m_slotVisitor.clearMarkStack();
  83         }
  84         m_slotVisitor.reset();
  85     }
  86
  87     void reviveCells()
  88     {
  89         for (JSCell* cell : m_liveCells)
  90             MarkedBlock::blockFor(cell)->setMarked(cell);
  91
  92         for (const JSCell* cell : m_savedMarkStack) {
  93             m_slotVisitor.markStack().append(cell);
  94             const_cast<JSCell*>(cell)->setRemembered(true);
  95         }
  96     }
  97
  98     typedef void ReturnType;
  99
 100     void returnValue() { };
 101
 102 private:
 103     Vector<const JSCell*> m_savedMarkStack;
 104     Vector<JSCell*> m_liveCells;
 105     SlotVisitor& m_slotVisitor;
 106 };
 107
 108 void GCLogging::dumpObjectGraph(Heap* heap)
 109 {
 110     LoggingFunctor loggingFunctor(heap->m_slotVisitor);
 111     HeapIterationScope iterationScope(*heap);
 112     heap->objectSpace().forEachLiveCell(iterationScope, loggingFunctor);
 113     loggingFunctor.log();
 114 }
 115
 116 } // namespace JSC
 117
 118 namespace WTF {
 119
 120 void printInternal(PrintStream& out, JSC::GCLogging::Level level)
 121 {
 122     switch (level) {
 123     case JSC::GCLogging::Level::None:
 124         out.print("None");
 125         return;
 126     case JSC::GCLogging::Level::Basic:
 127         out.print("Basic");
 128         return;
 129     case JSC::GCLogging::Level::Verbose:
 130         out.print("Verbose");
 131         return;
 132     default:
 133         out.print("Level=", level - JSC::GCLogging::Level::None);
 134         return;
 135     }
 136 }
 137
 138 } // namespace WTF
 139