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