JavaScriptCore/wtf/RefCountedLeakCounter.cpp

/*
 *  Copyright (C) 2008 Apple Inc. All rights reserved.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "RefCountedLeakCounter.h"

#include <wtf/HashCountedSet.h>

namespace WTF {

#ifdef NDEBUG

void RefCountedLeakCounter::suppressMessages(const char*) { }
void RefCountedLeakCounter::cancelMessageSuppression(const char*) { }

RefCountedLeakCounter::RefCountedLeakCounter(const char*) { }
RefCountedLeakCounter::~RefCountedLeakCounter() { }

void RefCountedLeakCounter::increment() { }
void RefCountedLeakCounter::decrement() { }

#else

#define LOG_CHANNEL_PREFIX Log
static WTFLogChannel LogRefCountedLeaks = { 0x00000000, "", WTFLogChannelOn };

typedef HashCountedSet<const char*, PtrHash<const char*> > ReasonSet;
static ReasonSet* leakMessageSuppressionReasons;

void RefCountedLeakCounter::suppressMessages(const char* reason)
{
    if (!leakMessageSuppressionReasons)
        leakMessageSuppressionReasons = new ReasonSet;
    leakMessageSuppressionReasons->add(reason);
}

void RefCountedLeakCounter::cancelMessageSuppression(const char* reason)
{
    ASSERT(leakMessageSuppressionReasons);
    ASSERT(leakMessageSuppressionReasons->contains(reason));
    leakMessageSuppressionReasons->remove(reason);
}

RefCountedLeakCounter::RefCountedLeakCounter(const char* description)
    : m_description(description)
{
}    

RefCountedLeakCounter::~RefCountedLeakCounter()
{
    static bool loggedSuppressionReason;
    if (m_count) {
        if (!leakMessageSuppressionReasons || leakMessageSuppressionReasons->isEmpty())
            LOG(RefCountedLeaks, "LEAK: %u %s", m_count, m_description);
        else if (!loggedSuppressionReason) {
            // This logs only one reason. Later we could change it so we log all the reasons.
            LOG(RefCountedLeaks, "No leak checking done: %s", leakMessageSuppressionReasons->begin()->first);
            loggedSuppressionReason = true;
        }
    }
}

void RefCountedLeakCounter::increment()
{
#if ENABLE(JSC_MULTIPLE_THREADS)
    atomicIncrement(&m_count);
#else
    ++m_count;
#endif
}

void RefCountedLeakCounter::decrement()
{
#if ENABLE(JSC_MULTIPLE_THREADS)
    atomicDecrement(&m_count);
#else
    --m_count;
#endif
}

#endif

} // namespace WTF