Initial Timeline Events

runtime/vm/timeline.cc

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include <cstdlib>
+
+#include "vm/isolate.h"
+#include "vm/json_stream.h"
+#include "vm/object.h"
+#include "vm/thread.h"
+#include "vm/timeline.h"
+
+namespace dart {
+
+DEFINE_FLAG(bool, trace_timeline, false, "Timeline trace");
+
+
+void TimelineEvent::Reset() {
+  set_event_type(kNone);
+  thread_ = NULL;
+  stream_ = NULL;
+  label_ = NULL;
+  arg_name_ = NULL;
+  if (arg_value_ != NULL) {
+    free(const_cast<char*>(arg_value_));
+  }
+}
+
+
+void TimelineEvent::DurationBegin(TimelineStream* stream, const char* label) {
+  Init(kDuration, stream, label);
+}
+
+
+void TimelineEvent::DurationEnd() {
+  timestamp1_ = OS::GetCurrentTimeMicros();
+}
+
+
+void TimelineEvent::Instant(TimelineStream* stream, const char* label) {
+  Init(kInstant, stream, label);
+}
+
+
+void TimelineEvent::SetArgument(const char* name, const char* value) {
+  arg_name_ = name;
+  arg_value_ = strdup(value);
+}
+
+void TimelineEvent::Init(EventType event_type,
+                         TimelineStream* stream,
+                         const char* label) {
+  set_event_type(event_type);
+  timestamp0_ = OS::GetCurrentTimeMicros();
+  thread_ = Thread::Current();
+  stream_ = stream;
+  label_ = label;
+  arg_name_ = NULL;
+  if (arg_value_ != NULL) {
+    free(const_cast<char*>(arg_value_));
+  }
+}
+
+
+static int64_t GetPid(Isolate* isolate) {
+  // Some mapping from Isolate* to an integer process id.
+  // TODO(Cutch): Investigate if process ids can be strings.
+  return static_cast<int64_t>(reinterpret_cast<uintptr_t>(isolate));
+}
+
+
+static int64_t GetTid(Thread* thread) {
+  // Some mapping from Thread* to an integer thread id.
+  // TODO(Cutch): Investigate if process ids can be strings.
+  return static_cast<int64_t>(reinterpret_cast<uintptr_t>(thread));
+}
+
+
+void TimelineEvent::PrintJSON(JSONStream* stream) {
+  JSONObject obj(stream);
+  int64_t pid = GetPid(Isolate::Current());
+  int64_t tid = GetTid(thread_);
+  obj.AddProperty("name", label_);
+  obj.AddProperty("cat", stream_->name());
+  obj.AddProperty64("tid", tid);
+  obj.AddProperty64("pid", pid);
+  obj.AddProperty("ts", static_cast<double>(timestamp0_));
+
+  switch (event_type()) {
+    case kDuration: {
+      obj.AddProperty("ph", "X");
+      obj.AddProperty("dur", static_cast<double>(timestamp1_ - timestamp0_));
+    }
+    break;
+    case kInstant: {
+      UNIMPLEMENTED();
+    }
+    break;
+    default:
+      UNIMPLEMENTED();
+  }
+
+  if (arg_name_ != NULL) {
+    JSONObject args(&obj, "args");
+    args.AddProperty(arg_name_, arg_value_);
+  }
+}
+
+
+TimelineStream::TimelineStream()
+    : buffer_(NULL),
+      name_(NULL),
+      enabled_(false) {
+}
+
+
+void TimelineStream::Init(const char* name, bool enabled) {
+  name_ = name;
+  enabled_ = enabled;
+}
+
+
+TimelineEvent* TimelineStream::RecordEvent(const Object& obj) {
+  if (!enabled_ || (buffer_ == NULL)) {
+    return NULL;
+  }
+  ASSERT(name_ != NULL);
+  ASSERT(buffer_ != NULL);
+  return buffer_->RecordEvent(obj);
+}
+
+
+TimelineEvent* TimelineStream::RecordEvent() {
+  if (!enabled_ || (buffer_ == NULL)) {
+    return NULL;
+  }
+  ASSERT(name_ != NULL);
+  return buffer_->RecordEvent();
+}
+
+
+intptr_t TimelineEventBuffer::SizeForCapacity(intptr_t capacity) {
+  return sizeof(TimelineEvent) * capacity;
+}
+
+
+TimelineEventBuffer::TimelineEventBuffer(intptr_t capacity)
+    : events_(NULL),
+      event_objects_(Array::null()),
+      cursor_(0),
+      capacity_(capacity) {
+  if (FLAG_trace_timeline) {
+    // 32-bit: 262,144 bytes per isolate.
+    // 64-bit: 393,216 bytes per isolate.
+    // NOTE: Internal isolates (vm and service) do not have a timeline
+    // event buffer.
+    OS::Print("TimelineEventBuffer is %" Pd " bytes (%" Pd " events)\n",
+              SizeForCapacity(capacity),
+              capacity);
+  }
+  events_ =
+      reinterpret_cast<TimelineEvent*>(calloc(capacity, sizeof(TimelineEvent)));
+  const Array& array = Array::Handle(Array::New(capacity, Heap::kOld));
+  event_objects_ = array.raw();
+}
+
+
+TimelineEventBuffer::~TimelineEventBuffer() {
+  for (intptr_t i = 0; i < capacity_; i++) {
+    // Clear any extra data.
+    events_[i].Reset();
+  }
+  free(events_);
+  event_objects_ = Array::null();
+}
+
+
+void TimelineEventBuffer::DumpMeta(JSONArray* events) {
+  Isolate* isolate = Isolate::Current();
+  JSONObject obj(events);
+  int64_t pid = GetPid(isolate);
+  obj.AddProperty("ph", "M");
+  obj.AddProperty64("pid", pid);
+  obj.AddProperty("name", "process_name");
+  {
+    JSONObject args(&obj, "args");
+    args.AddProperty("name", isolate->debugger_name());
+  }
+}
+
+
+void TimelineEventBuffer::DumpEvents(JSONArray* events) {
+  for (intptr_t i = 0; i < capacity_; i++) {
+    if (events_[i].IsValid()) {
+      events->AddValue(&events_[i]);
+    }
+  }
+}
+
+
+void TimelineEventBuffer::Dump() {
+  JSONStream js;
+  {
+    JSONObject topLevel(&js);
+    topLevel.AddProperty("type", "Timeline");
+    {
+      JSONArray events(&topLevel, "traceEvents");
+      DumpMeta(&events);
+      DumpEvents(&events);
+    }
+  }
+  OS::Print("%s\n", js.ToCString());
+}
+
+
+intptr_t TimelineEventBuffer::GetNextIndex() {
+  uintptr_t cursor = AtomicOperations::FetchAndIncrement(&cursor_);
+  return cursor % capacity_;
+}
+
+
+void TimelineEventBuffer::VisitObjectPointers(ObjectPointerVisitor* visitor) {
+  visitor->VisitPointer(reinterpret_cast<RawObject**>(&event_objects_));
+}
+
+
+TimelineEvent* TimelineEventBuffer::RecordEvent(const Object& obj) {
+  ASSERT(events_ != NULL);
+  uintptr_t index = GetNextIndex();
+  const Array& event_objects = Array::Handle(event_objects_);
+  event_objects.SetAt(index, obj);
+  return &events_[index];
+}
+
+
+TimelineEvent* TimelineEventBuffer::RecordEvent() {
+  ASSERT(events_ != NULL);
+  uintptr_t index = GetNextIndex();
+  return &events_[index];
+}
+
+}  // namespace dart