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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "InstanceCounter.h"
#include "wtf/HashMap.h"
#include "wtf/StdLibExtras.h"
#include "wtf/ThreadingPrimitives.h"
#include "wtf/text/StringBuilder.h"
#include "wtf/text/StringHash.h"
#include "wtf/text/WTFString.h"
namespace WTF {
#ifdef ENABLE_INSTANCE_COUNTER
// This function is used to stringify a typename T without using RTTI.
// The result of extractNameFunc<T>() is given as |funcName|. |extractNameFromFunctionName| then extracts a typename string from |funcName|.
String extractNameFromFunctionName(const char* funcName)
{
#if COMPILER(GCC)
const size_t prefixLength = sizeof("const char* WTF::extractNameFunc() [with T = ") - 1;
size_t funcNameLength = strlen(funcName);
ASSERT(funcNameLength > prefixLength + 1);
const char* funcNameWithoutPrefix = funcName + prefixLength;
return String(funcNameWithoutPrefix, funcNameLength - prefixLength - 1 /* last ] */);
#else
// FIXME: Support other compilers
ASSERT(false);
#endif
}
class InstanceCounter {
public:
void incrementInstanceCount(const String& instanceName, void* ptr);
void decrementInstanceCount(const String& instanceName, void* ptr);
String dump();
static InstanceCounter* instance()
{
DEFINE_STATIC_LOCAL(InstanceCounter, self, ());
return &self;
}
private:
InstanceCounter() { }
Mutex m_mutex;
HashMap<String, int> m_counterMap;
};
void incrementInstanceCount(const char* extractNameFuncName, void* ptr)
{
String instanceName = extractNameFromFunctionName(extractNameFuncName);
InstanceCounter::instance()->incrementInstanceCount(instanceName, ptr);
}
void decrementInstanceCount(const char* extractNameFuncName, void* ptr)
{
String instanceName = extractNameFromFunctionName(extractNameFuncName);
InstanceCounter::instance()->decrementInstanceCount(instanceName, ptr);
}
String dumpRefCountedInstanceCounts()
{
return InstanceCounter::instance()->dump();
}
void InstanceCounter::incrementInstanceCount(const String& instanceName, void* ptr)
{
MutexLocker locker(m_mutex);
HashMap<String, int>::AddResult result = m_counterMap.add(instanceName, 1);
if (!result.isNewEntry)
++(result.iterator->value);
}
void InstanceCounter::decrementInstanceCount(const String& instanceName, void* ptr)
{
MutexLocker locker(m_mutex);
HashMap<String, int>::iterator it = m_counterMap.find(instanceName);
ASSERT(it != m_counterMap.end());
--(it->value);
if (!it->value)
m_counterMap.remove(it);
}
String InstanceCounter::dump()
{
MutexLocker locker(m_mutex);
StringBuilder builder;
builder.append("{");
HashMap<String, int>::iterator it = m_counterMap.begin();
HashMap<String, int>::iterator itEnd = m_counterMap.end();
for (; it != itEnd; ++it) {
if (it != m_counterMap.begin())
builder.append(",");
builder.append("\"");
builder.append(it->key);
builder.append("\": ");
builder.append(String::number(it->value));
}
builder.append("}");
return builder.toString();
}
#else
String dumpRefCountedInstanceCounts()
{
return String("{}");
}
#endif // ENABLE_INSTANCE_COUNTER
} // namespace WTF
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