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         , isolate(0)
  88     {
  89     }
  90
  91     void takeSnapshot(v8::HeapSnapshot::Type);
  92
  93     void printProfileTree(const v8::CpuProfileNode *node, int level = 0);
  94     void sendMessages();
  95
  96     QList<QV8ProfilerData> m_data;
  97
  98     bool initialized;
  99     QList<QDeclarativeEngine *> engines;
 100     v8::Isolate *isolate;
 101 };
 102
 103 QV8ProfilerService::QV8ProfilerService(QObject *parent)
 104     : QDeclarativeDebugService(*(new QV8ProfilerServicePrivate()), QLatin1String("V8Profiler"), parent)
 105 {
 106     Q_D(QV8ProfilerService);
 107     if (status() == Enabled) {
 108         // ,block mode, client attached
 109         while (!d->initialized)
 110             waitForMessage();
 111     }
 112 }
 113
 114 QV8ProfilerService::~QV8ProfilerService()
 115 {
 116 }
 117
 118 QV8ProfilerService *QV8ProfilerService::instance()
 119 {
 120     return v8ProfilerInstance();
 121 }
 122
 123 void QV8ProfilerService::addEngine(QDeclarativeEngine *engine)
 124 {
 125     Q_D(QV8ProfilerService);
 126     Q_ASSERT(engine);
 127     Q_ASSERT(!d->engines.contains(engine));
 128
 129     d->engines.append(engine);
 130 }
 131
 132 void QV8ProfilerService::removeEngine(QDeclarativeEngine *engine)
 133 {
 134     Q_D(QV8ProfilerService);
 135     Q_ASSERT(engine);
 136     Q_ASSERT(d->engines.contains(engine));
 137
 138     d->engines.removeOne(engine);
 139 }
 140
 141 void QV8ProfilerService::messageReceived(const QByteArray &message)
 142 {
 143     Q_D(QV8ProfilerService);
 144
 145     QDataStream ds(message);
 146     QByteArray command;
 147     QByteArray option;
 148     QByteArray title;
 149     ds >> command >> option;
 150
 151     if (!d->isolate) {
 152         d->isolate = v8::Isolate::New();
 153         v8::Isolate::Scope scope(d->isolate);
 154         v8::V8::Initialize();
 155     }
 156
 157     v8::Isolate::Scope scope(d->isolate);
 158
 159     if (command == "V8PROFILER") {
 160         ds >>  title;
 161         if (option == "start") {
 162             startProfiling(QString::fromUtf8(title));
 163         } else if (option == "stop") {
 164             stopProfiling(QString::fromUtf8(title));
 165             sendProfilingData();
 166         }
 167         d->initialized = true;
 168     }
 169
 170     if (command == "V8SNAPSHOT") {
 171         if (option == "full")
 172             d->takeSnapshot(v8::HeapSnapshot::kFull);
 173         else if (option == "delete") {
 174             v8::HeapProfiler::DeleteAllSnapshots();
 175         }
 176     }
 177
 178     QDeclarativeDebugService::messageReceived(message);
 179 }
 180
 181 void QV8ProfilerService::startProfiling(const QString &title)
 182 {
 183     // Start 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     v8::CpuProfiler::StartProfiling(v8title);
 187 }
 188
 189 void QV8ProfilerService::stopProfiling(const QString &title)
 190 {
 191     Q_D(QV8ProfilerService);
 192     // Stop profiling
 193     v8::HandleScope handle_scope;
 194     v8::Handle<v8::String> v8title = v8::String::New(reinterpret_cast<const uint16_t*>(title.data()), title.size());
 195     const v8::CpuProfile *cpuProfile = v8::CpuProfiler::StopProfiling(v8title);
 196     if (cpuProfile) {
 197         // can happen at start
 198         const v8::CpuProfileNode *rootNode = cpuProfile->GetTopDownRoot();
 199         d->printProfileTree(rootNode);
 200     }
 201 }
 202
 203 void QV8ProfilerService::sendProfilingData()
 204 {
 205     Q_D(QV8ProfilerService);
 206     // Send messages to client
 207     d->sendMessages();
 208 }
 209
 210 void QV8ProfilerServicePrivate::printProfileTree(const v8::CpuProfileNode *node, int level)
 211 {
 212     for (int index = 0 ; index < node->GetChildrenCount() ; index++) {
 213         const v8::CpuProfileNode* childNode = node->GetChild(index);
 214         if (QV8Engine::toStringStatic(childNode->GetScriptResourceName()).length() > 0) {
 215
 216             QV8ProfilerData rd = {(int)QV8ProfilerService::V8Entry, QV8Engine::toStringStatic(childNode->GetScriptResourceName()),
 217                 QV8Engine::toStringStatic(childNode->GetFunctionName()),
 218                 childNode->GetLineNumber(), childNode->GetTotalTime(), childNode->GetSelfTime(), level};
 219             m_data.append(rd);
 220
 221             // different nodes might have common children: fix at client side
 222             if (childNode->GetChildrenCount() > 0) {
 223                 printProfileTree(childNode, level+1);
 224             }
 225         }
 226     }
 227 }
 228
 229 void QV8ProfilerServicePrivate::takeSnapshot(v8::HeapSnapshot::Type snapshotType)
 230 {
 231     Q_Q(QV8ProfilerService);
 232
 233     v8::HandleScope scope;
 234     v8::Local<v8::String> title = v8::String::New("");
 235
 236     QByteArray jsonSnapshot;
 237     ByteArrayOutputStream bos(&jsonSnapshot);
 238     const v8::HeapSnapshot *snapshot = v8::HeapProfiler::TakeSnapshot(title, snapshotType);
 239     snapshot->Serialize(&bos, v8::HeapSnapshot::kJSON);
 240
 241     QByteArray data;
 242     QDataStream ds(&data, QIODevice::WriteOnly);
 243     ds << (int)QV8ProfilerService::V8Snapshot << jsonSnapshot;
 244
 245     q->sendMessage(data);
 246 }
 247
 248 void QV8ProfilerServicePrivate::sendMessages()
 249 {
 250     Q_Q(QV8ProfilerService);
 251
 252     for (int i = 0; i < m_data.count(); ++i)
 253         q->sendMessage(m_data.at(i).toByteArray());
 254     m_data.clear();
 255
 256     //indicate completion
 257     QByteArray data;
 258     QDataStream ds(&data, QIODevice::WriteOnly);
 259     ds << (int)QV8ProfilerService::V8Complete;
 260
 261     q->sendMessage(data);
 262 }
 263
 264
 265 QT_END_NAMESPACE