Adding raw tracing to trace framework.

base/debug/trace_event_impl.cc

Index: base/debug/trace_event_impl.cc
diff --git a/base/debug/trace_event_impl.cc b/base/debug/trace_event_impl.cc
index 823acbe17726396b25168599476f1c85f5760e88..11f5d74929013cfdb2df26986358715c85431180 100644
--- a/base/debug/trace_event_impl.cc
+++ b/base/debug/trace_event_impl.cc
@@ -609,6 +609,33 @@ void TraceLog::Flush(const TraceLog::OutputCallback& cb) {
   }
 }
 
+int TraceLog::AddTraceEventExplicit(char phase,
+                                    const unsigned char* category_enabled,
+                                    const char* name,
+                                    int64 timestamp,
+                                    unsigned long long id,
+                                    int num_args,
+                                    const char** arg_names,
+                                    const unsigned char* arg_types,
+                                    const unsigned long long* arg_values,
+                                    int threshold_begin_id,
+                                    long long threshold,
+                                    unsigned char flags) {
+  DCHECK(name);
+  TimeTicks now = TimeTicks::FromInternalValue(timestamp);
+  NotificationHelper notifier(this);
+
+  int ret_begin_id = AddTraceEventInternal(notifier, now, phase,
+                                           category_enabled, name,
+                                           id, num_args, arg_names, arg_types,
+                                           arg_values, threshold_begin_id,
+                                           threshold, flags);
+
+  notifier.SendNotificationIfAny();
+
+  return ret_begin_id;
+}
+
 int TraceLog::AddTraceEvent(char phase,
                             const unsigned char* category_enabled,
                             const char* name,
@@ -629,79 +656,98 @@ int TraceLog::AddTraceEvent(char phase,
 
   TimeTicks now = TimeTicks::NowFromSystemTraceTime();
   NotificationHelper notifier(this);
-  int ret_begin_id = -1;
-  {
-    AutoLock lock(lock_);
-    if (*category_enabled != CATEGORY_ENABLED)
-      return -1;
-    if (logged_events_.size() >= kTraceEventBufferSize)
-      return -1;
 
-    int thread_id = static_cast<int>(PlatformThread::CurrentId());
-
-    const char* new_name = PlatformThread::GetName();
-    // Check if the thread name has been set or changed since the previous
-    // call (if any), but don't bother if the new name is empty. Note this will
-    // not detect a thread name change within the same char* buffer address: we
-    // favor common case performance over corner case correctness.
-    if (new_name != g_current_thread_name.Get().Get() &&
-        new_name && *new_name) {
-      g_current_thread_name.Get().Set(new_name);
-      base::hash_map<int, std::string>::iterator existing_name =
-          thread_names_.find(thread_id);
-      if (existing_name == thread_names_.end()) {
-        // This is a new thread id, and a new name.
-        thread_names_[thread_id] = new_name;
-      } else {
-        // This is a thread id that we've seen before, but potentially with a
-        // new name.
-        std::vector<base::StringPiece> existing_names;
-        Tokenize(existing_name->second, ",", &existing_names);
-        bool found = std::find(existing_names.begin(),
-                               existing_names.end(),
-                               new_name) != existing_names.end();
-        if (!found) {
-          existing_name->second.push_back(',');
-          existing_name->second.append(new_name);
-        }
-      }
-    }
+  int ret_begin_id = AddTraceEventInternal(notifier, now, phase,
+                                           category_enabled, name,
+                                           id, num_args, arg_names, arg_types,
+                                           arg_values, threshold_begin_id,
+                                           threshold, flags);
+
+  notifier.SendNotificationIfAny();
+
+  return ret_begin_id;
+}
 
-    if (threshold_begin_id > -1) {
-      DCHECK(phase == TRACE_EVENT_PHASE_END);
-      size_t begin_i = static_cast<size_t>(threshold_begin_id);
-      // Return now if there has been a flush since the begin event was posted.
-      if (begin_i >= logged_events_.size())
-        return -1;
-      // Determine whether to drop the begin/end pair.
-      TimeDelta elapsed = now - logged_events_[begin_i].timestamp();
-      if (elapsed < TimeDelta::FromMicroseconds(threshold)) {
-        // Remove begin event and do not add end event.
-        // This will be expensive if there have been other events in the
-        // mean time (should be rare).
-        logged_events_.erase(logged_events_.begin() + begin_i);
-        return -1;
+int TraceLog::AddTraceEventInternal(NotificationHelper& notifier,
+                                    TimeTicks timestamp,
+                                    char phase,
+                                    const unsigned char* category_enabled,
+                                    const char* name,
+                                    unsigned long long id,
+                                    int num_args,
+                                    const char** arg_names,
+                                    const unsigned char* arg_types,
+                                    const unsigned long long* arg_values,
+                                    int threshold_begin_id,
+                                    long long threshold,
+                                    unsigned char flags) {
+  AutoLock lock(lock_);
+  if (*category_enabled != CATEGORY_ENABLED)
+    return -1;
+  if (logged_events_.size() >= kTraceEventBufferSize)
+    return -1;
+
+  int thread_id = static_cast<int>(PlatformThread::CurrentId());
+  const char* new_name = PlatformThread::GetName();
+  // Check if the thread name has been set or changed since the previous
+  // call (if any), but don't bother if the new name is empty. Note this will
+  // not detect a thread name change within the same char* buffer address: we
+  // favor common case performance over corner case correctness.
+  if (new_name != g_current_thread_name.Get().Get() &&
+      new_name && *new_name) {
+    g_current_thread_name.Get().Set(new_name);
+    base::hash_map<int, std::string>::iterator existing_name =
+        thread_names_.find(thread_id);
+    if (existing_name == thread_names_.end()) {
+      // This is a new thread id, and a new name.
+      thread_names_[thread_id] = new_name;
+    } else {
+      // This is a thread id that we've seen before, but potentially with a
+      // new name.
+      std::vector<base::StringPiece> existing_names;
+      Tokenize(existing_name->second, ",", &existing_names);
+      bool found = std::find(existing_names.begin(),
+                             existing_names.end(),
+                             new_name) != existing_names.end();
+      if (!found) {
+        existing_name->second.push_back(',');
+        existing_name->second.append(new_name);
       }
     }
+  }
 
-    if (flags & TRACE_EVENT_FLAG_MANGLE_ID)
-      id ^= process_id_hash_;
+  if (threshold_begin_id > -1) {
+    DCHECK(phase == TRACE_EVENT_PHASE_END);
+    size_t begin_i = static_cast<size_t>(threshold_begin_id);
+    // Return now if there has been a flush since the begin event was posted.
+    if (begin_i >= logged_events_.size())
+      return -1;
+    // Determine whether to drop the begin/end pair.
+    TimeDelta elapsed = timestamp - logged_events_[begin_i].timestamp();
+    if (elapsed < TimeDelta::FromMicroseconds(threshold)) {
+      // Remove begin event and do not add end event.
+      // This will be expensive if there have been other events in the
+      // mean time (should be rare).
+      logged_events_.erase(logged_events_.begin() + begin_i);
+      return -1;
+    }
+  }
 
-    ret_begin_id = static_cast<int>(logged_events_.size());
-    logged_events_.push_back(
-        TraceEvent(thread_id,
-                   now, phase, category_enabled, name, id,
-                   num_args, arg_names, arg_types, arg_values,
-                   flags));
+  if (flags & TRACE_EVENT_FLAG_MANGLE_ID)
+    id ^= process_id_hash_;
 
-    if (logged_events_.size() == kTraceEventBufferSize)
-      notifier.AddNotificationWhileLocked(TRACE_BUFFER_FULL);
+  int ret_begin_id = static_cast<int>(logged_events_.size());
+  logged_events_.push_back(
+      TraceEvent(thread_id,
+                 timestamp, phase, category_enabled, name, id,
+                 num_args, arg_names, arg_types, arg_values,
+                 flags));
 
-    if (watch_category_ == category_enabled && watch_event_name_ == name)
-      notifier.AddNotificationWhileLocked(EVENT_WATCH_NOTIFICATION);
-  }  // release lock
+  if (logged_events_.size() == kTraceEventBufferSize)
+    notifier.AddNotificationWhileLocked(TRACE_BUFFER_FULL);
 
-  notifier.SendNotificationIfAny();
+  if (watch_category_ == category_enabled && watch_event_name_ == name)
+    notifier.AddNotificationWhileLocked(EVENT_WATCH_NOTIFICATION);
 
   return ret_begin_id;
 }