src/declarative/debugger/qv8profilerservice.cpp

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  41
  42 #include "qv8profilerservice_p.h"
  43 #include "qdeclarativedebugservice_p_p.h"
  44 #include <private/qdeclarativeengine_p.h>
  45 #include <private/qv8profiler_p.h>
  46
  47 #include <QtCore/QHash>
  48
  49 QT_BEGIN_NAMESPACE
  50
  51 Q_GLOBAL_STATIC(QV8ProfilerService, v8ProfilerInstance)
  52
  53 class ByteArrayOutputStream : public v8::OutputStream
  54 {
  55     QByteArray *_buffer;
  56 public:
  57     ByteArrayOutputStream(QByteArray *buffer)
  58         : v8::OutputStream(),
  59           _buffer(buffer) {}
  60     void EndOfStream() {}
  61     WriteResult WriteAsciiChunk(char *data, int size)
  62     {
  63         QByteArray b(data, size);
  64         _buffer->append(b);
  65         return kContinue;
  66     }
  67 };
  68
  69 // convert to a QByteArray that can be sent to the debug client
  70 QByteArray QV8ProfilerData::toByteArray() const
  71 {
  72     QByteArray data;
  73     //### using QDataStream is relatively expensive
  74     QDataStream ds(&data, QIODevice::WriteOnly);
  75     ds << messageType << filename << functionname << lineNumber << totalTime << selfTime << treeLevel;
  76
  77     return data;
  78 }
  79
  80 class QV8ProfilerServicePrivate : public QDeclarativeDebugServicePrivate
  81 {
  82     Q_DECLARE_PUBLIC(QV8ProfilerService)
  83
  84 public:
  85     QV8ProfilerServicePrivate()
  86         :initialized(false)
  87     {
  88     }
  89
  90     void takeSnapshot(v8::HeapSnapshot::Type);
  91
  92     void printProfileTree(const v8::CpuProfileNode *node, int level = 0);
  93     void sendMessages();
  94
  95     QList<QV8ProfilerData> m_data;
  96
  97     bool initialized;
  98     QList<QDeclarativeEngine *> engines;
  99 };
 100
 101 QV8ProfilerService::QV8ProfilerService(QObject *parent)
 102     : QDeclarativeDebugService(*(new QV8ProfilerServicePrivate()), QLatin1String("V8Profiler"), parent)
 103 {
 104     Q_D(QV8ProfilerService);
 105     if (status() == Enabled) {
 106         // ,block mode, client attached
 107         while (!d->initialized)
 108             waitForMessage();
 109     }
 110 }
 111
 112 QV8ProfilerService::~QV8ProfilerService()
 113 {
 114 }
 115
 116 QV8ProfilerService *QV8ProfilerService::instance()
 117 {
 118     return v8ProfilerInstance();
 119 }
 120
 121 void QV8ProfilerService::addEngine(QDeclarativeEngine *engine)
 122 {
 123     Q_D(QV8ProfilerService);
 124     Q_ASSERT(engine);
 125     Q_ASSERT(!d->engines.contains(engine));
 126
 127     d->engines.append(engine);
 128 }
 129
 130 void QV8ProfilerService::removeEngine(QDeclarativeEngine *engine)
 131 {
 132     Q_D(QV8ProfilerService);
 133     Q_ASSERT(engine);
 134     Q_ASSERT(d->engines.contains(engine));
 135
 136     d->engines.removeOne(engine);
 137 }
 138
 139 void QV8ProfilerService::messageReceived(const QByteArray &message)
 140 {
 141     Q_D(QV8ProfilerService);
 142
 143     QDataStream ds(message);
 144     QByteArray command;
 145     QByteArray option;
 146     QByteArray title;
 147     ds >> command >> option;
 148
 149     if (command == "V8PROFILER") {
 150         ds >>  title;
 151         if (option == "start") {
 152             startProfiling(QString::fromUtf8(title));
 153         } else if (option == "stop") {
 154             stopProfiling(QString::fromUtf8(title));
 155             // Send messages to client
 156             d->sendMessages();
 157         }
 158         d->initialized = true;
 159     }
 160
 161     if (command == "V8SNAPSHOT") {
 162         if (option == "full")
 163             d->takeSnapshot(v8::HeapSnapshot::kFull);
 164         else if (option == "delete") {
 165             v8::HeapProfiler::DeleteAllSnapshots();
 166         }
 167     }
 168
 169     QDeclarativeDebugService::messageReceived(message);
 170 }
 171
 172 void QV8ProfilerService::startProfiling(const QString &title)
 173 {
 174     // Start Profiling
 175     v8::HandleScope handle_scope;
 176     v8::Handle<v8::String> v8title = v8::String::New(reinterpret_cast<const uint16_t*>(title.data()), title.size());
 177     v8::CpuProfiler::StartProfiling(v8title);
 178 }
 179
 180 void QV8ProfilerService::stopProfiling(const QString &title)
 181 {
 182     Q_D(QV8ProfilerService);
 183     // Stop profiling
 184     v8::HandleScope handle_scope;
 185     v8::Handle<v8::String> v8title = v8::String::New(reinterpret_cast<const uint16_t*>(title.data()), title.size());
 186     const v8::CpuProfile *cpuProfile = v8::CpuProfiler::StopProfiling(v8title);
 187     if (cpuProfile) {
 188         // can happen at start
 189         const v8::CpuProfileNode *rootNode = cpuProfile->GetTopDownRoot();
 190         d->printProfileTree(rootNode);
 191     }
 192 }
 193
 194 void QV8ProfilerServicePrivate::printProfileTree(const v8::CpuProfileNode *node, int level)
 195 {
 196     for (int index = 0 ; index < node->GetChildrenCount() ; index++) {
 197         const v8::CpuProfileNode* childNode = node->GetChild(index);
 198         if (QV8Engine::toStringStatic(childNode->GetScriptResourceName()).length() > 0) {
 199
 200             QV8ProfilerData rd = {(int)QV8ProfilerService::V8Entry, QV8Engine::toStringStatic(childNode->GetScriptResourceName()),
 201                 QV8Engine::toStringStatic(childNode->GetFunctionName()),
 202                 childNode->GetLineNumber(), childNode->GetTotalTime(), childNode->GetSelfTime(), level};
 203             m_data.append(rd);
 204
 205             // different nodes might have common children: fix at client side
 206             if (childNode->GetChildrenCount() > 0) {
 207                 printProfileTree(childNode, level+1);
 208             }
 209         }
 210     }
 211 }
 212
 213 void QV8ProfilerServicePrivate::takeSnapshot(v8::HeapSnapshot::Type snapshotType)
 214 {
 215     Q_Q(QV8ProfilerService);
 216
 217     v8::HandleScope scope;
 218     v8::Local<v8::String> title = v8::String::New("");
 219
 220     QByteArray jsonSnapshot;
 221     ByteArrayOutputStream bos(&jsonSnapshot);
 222     const v8::HeapSnapshot *snapshot = v8::HeapProfiler::TakeSnapshot(title, snapshotType);
 223     snapshot->Serialize(&bos, v8::HeapSnapshot::kJSON);
 224
 225     QByteArray data;
 226     QDataStream ds(&data, QIODevice::WriteOnly);
 227     ds << (int)QV8ProfilerService::V8Snapshot << jsonSnapshot;
 228
 229     q->sendMessage(data);
 230 }
 231
 232 void QV8ProfilerServicePrivate::sendMessages()
 233 {
 234     Q_Q(QV8ProfilerService);
 235
 236     for (int i = 0; i < m_data.count(); ++i)
 237         q->sendMessage(m_data.at(i).toByteArray());
 238     m_data.clear();
 239
 240     //indicate completion
 241     QByteArray data;
 242     QDataStream ds(&data, QIODevice::WriteOnly);
 243     ds << (int)QV8ProfilerService::V8Complete;
 244
 245     q->sendMessage(data);
 246 }
 247
 248
 249 QT_END_NAMESPACE