src/declarative/debugger/qv8profilerservice.cpp

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  41
  42 #include "qv8profilerservice_p.h"
  43 #include "qdeclarativedebugservice_p_p.h"
  44 #include "private/qjsconverter_impl_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     v8::Isolate *isolate;
 100 };
 101
 102 QV8ProfilerService::QV8ProfilerService(QObject *parent)
 103     : QDeclarativeDebugService(*(new QV8ProfilerServicePrivate()), QLatin1String("V8Profiler"), parent)
 104 {
 105     Q_D(QV8ProfilerService);
 106
 107     if (registerService() == 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::initialize()
 124 {
 125     // just make sure that the service is properly registered
 126     v8ProfilerInstance();
 127 }
 128
 129 void QV8ProfilerService::messageReceived(const QByteArray &message)
 130 {
 131     Q_D(QV8ProfilerService);
 132
 133     QDataStream ds(message);
 134     QByteArray command;
 135     QByteArray option;
 136     QByteArray title;
 137     ds >> command >> option;
 138
 139     if (!d->isolate) {
 140         d->isolate = v8::Isolate::New();
 141         v8::Isolate::Scope scope(d->isolate);
 142         v8::V8::Initialize();
 143     }
 144
 145     v8::Isolate::Scope scope(d->isolate);
 146
 147     if (command == "V8PROFILER") {
 148         ds >>  title;
 149         if (option == "start") {
 150             startProfiling(QString::fromUtf8(title));
 151         } else if (option == "stop") {
 152             stopProfiling(QString::fromUtf8(title));
 153             sendProfilingData();
 154         }
 155         d->initialized = true;
 156     }
 157
 158     if (command == "V8SNAPSHOT") {
 159         if (option == "full")
 160             d->takeSnapshot(v8::HeapSnapshot::kFull);
 161         else if (option == "delete") {
 162             v8::HeapProfiler::DeleteAllSnapshots();
 163         }
 164     }
 165
 166     QDeclarativeDebugService::messageReceived(message);
 167 }
 168
 169 void QV8ProfilerService::startProfiling(const QString &title)
 170 {
 171     // Start Profiling
 172     v8::HandleScope handle_scope;
 173     v8::Handle<v8::String> v8title = v8::String::New(reinterpret_cast<const uint16_t*>(title.data()), title.size());
 174     v8::CpuProfiler::StartProfiling(v8title);
 175 }
 176
 177 void QV8ProfilerService::stopProfiling(const QString &title)
 178 {
 179     Q_D(QV8ProfilerService);
 180     // Stop profiling
 181     v8::HandleScope handle_scope;
 182     v8::Handle<v8::String> v8title = v8::String::New(reinterpret_cast<const uint16_t*>(title.data()), title.size());
 183     const v8::CpuProfile *cpuProfile = v8::CpuProfiler::StopProfiling(v8title);
 184     if (cpuProfile) {
 185         // can happen at start
 186         const v8::CpuProfileNode *rootNode = cpuProfile->GetTopDownRoot();
 187         d->printProfileTree(rootNode);
 188     }
 189 }
 190
 191 void QV8ProfilerService::sendProfilingData()
 192 {
 193     Q_D(QV8ProfilerService);
 194     // Send messages to client
 195     d->sendMessages();
 196 }
 197
 198 void QV8ProfilerServicePrivate::printProfileTree(const v8::CpuProfileNode *node, int level)
 199 {
 200     for (int index = 0 ; index < node->GetChildrenCount() ; index++) {
 201         const v8::CpuProfileNode* childNode = node->GetChild(index);
 202         QString scriptResourceName = QJSConverter::toString(childNode->GetScriptResourceName());
 203         if (scriptResourceName.length() > 0) {
 204
 205             QV8ProfilerData rd = {(int)QV8ProfilerService::V8Entry, scriptResourceName,
 206                 QJSConverter::toString(childNode->GetFunctionName()),
 207                 childNode->GetLineNumber(), childNode->GetTotalTime(), childNode->GetSelfTime(), level};
 208             m_data.append(rd);
 209
 210             // different nodes might have common children: fix at client side
 211             if (childNode->GetChildrenCount() > 0) {
 212                 printProfileTree(childNode, level+1);
 213             }
 214         }
 215     }
 216 }
 217
 218 void QV8ProfilerServicePrivate::takeSnapshot(v8::HeapSnapshot::Type snapshotType)
 219 {
 220     Q_Q(QV8ProfilerService);
 221
 222     v8::HandleScope scope;
 223     v8::Local<v8::String> title = v8::String::New("");
 224
 225     QByteArray jsonSnapshot;
 226     ByteArrayOutputStream bos(&jsonSnapshot);
 227     const v8::HeapSnapshot *snapshot = v8::HeapProfiler::TakeSnapshot(title, snapshotType);
 228     snapshot->Serialize(&bos, v8::HeapSnapshot::kJSON);
 229
 230     QByteArray data;
 231     QDataStream ds(&data, QIODevice::WriteOnly);
 232     ds << (int)QV8ProfilerService::V8Snapshot << jsonSnapshot;
 233
 234     q->sendMessage(data);
 235 }
 236
 237 void QV8ProfilerServicePrivate::sendMessages()
 238 {
 239     Q_Q(QV8ProfilerService);
 240
 241     for (int i = 0; i < m_data.count(); ++i)
 242         q->sendMessage(m_data.at(i).toByteArray());
 243     m_data.clear();
 244
 245     //indicate completion
 246     QByteArray data;
 247     QDataStream ds(&data, QIODevice::WriteOnly);
 248     ds << (int)QV8ProfilerService::V8Complete;
 249
 250     q->sendMessage(data);
 251 }
 252
 253
 254 QT_END_NAMESPACE