Start TimelineAnalysis utility

runtime/vm/timeline_analysis.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 "vm/timeline_analysis.h"
+
+#include "vm/flags.h"
+
+namespace dart {
+
+DECLARE_FLAG(bool, trace_timeline);
+
+
+TimelineAnalysisThread::TimelineAnalysisThread(ThreadId id)
+    : id_(id) {
+}
+
+
+TimelineAnalysisThread::~TimelineAnalysisThread() {
+}
+
+
+void TimelineAnalysisThread::AddBlock(TimelineEventBlock* block) {
+  blocks_.Add(block);
+}
+
+
+static int CompareBlocksLowerTimeBound(TimelineEventBlock* const* a,
+                                       TimelineEventBlock* const* b) {
+  ASSERT(a != NULL);
+  ASSERT(*a != NULL);
+  ASSERT(b != NULL);
+  ASSERT(*b != NULL);
+  return (*a)->LowerTimeBound() - (*b)->LowerTimeBound();
+}
+
+
+void TimelineAnalysisThread::Finalize() {
+  blocks_.Sort(CompareBlocksLowerTimeBound);
+}
+
+
+TimelineAnalysis::TimelineAnalysis(Zone* zone,
+                                   Isolate* isolate,
+                                   TimelineEventEndlessRecorder* recorder)
+    : zone_(zone),
+      isolate_(isolate),
+      recorder_(recorder),
+      has_error_(false),
+      error_msg_(NULL) {
+  ASSERT(zone_ != NULL);
+  ASSERT(isolate_ != NULL);
+  ASSERT(recorder_ != NULL);
+}
+
+
+TimelineAnalysis::~TimelineAnalysis() {
+}
+
+
+void TimelineAnalysis::BuildThreads() {
+  DiscoverThreads();
+  FinalizeThreads();
+}
+
+
+TimelineAnalysisThread* TimelineAnalysis::GetThread(ThreadId tid) {
+  // Linear lookup because we expect N (# of threads in an isolate) to be small.
+  for (intptr_t i = 0; i < threads_.length(); i++) {
+    TimelineAnalysisThread* thread = threads_.At(i);
+    ASSERT(thread != NULL);
+    if (thread->id() == tid) {
+      return thread;
+    }
+  }
+  return NULL;
+}
+
+
+TimelineAnalysisThread* TimelineAnalysis::GetOrAddThread(ThreadId tid) {
+  TimelineAnalysisThread* thread = GetThread(tid);
+  if (thread != NULL) {
+    return thread;
+  }
+  // New thread.
+  thread = new TimelineAnalysisThread(tid);
+  threads_.Add(thread);
+  return thread;
+}
+
+
+void TimelineAnalysis::DiscoverThreads() {
+  TimelineEventBlockIterator it(recorder_);
+  while (it.Next()) {
+    TimelineEventBlock* block = it.current();
+    ASSERT(block != NULL);
+    if (block->IsEmpty()) {
+      // Skip empty blocks.
+      continue;
+    }
+    if (!block->CheckBlock()) {
+      // Skip bad blocks.
+      // TODO(johnmccutchan): Make this into an error?
+      continue;
+    }
+    TimelineAnalysisThread* thread = GetOrAddThread(block->thread());
+    ASSERT(thread != NULL);
+    thread->AddBlock(block);
+  }
+}
+
+
+void TimelineAnalysis::FinalizeThreads() {
+  for (intptr_t i = 0; i < threads_.length(); i++) {
+    TimelineAnalysisThread* thread = threads_.At(i);
+    ASSERT(thread != NULL);
+    thread->Finalize();
+  }
+}
+
+
+void TimelineAnalysis::SetError(const char* format, ...) {
+  ASSERT(!has_error_);
+  ASSERT(error_msg_ == NULL);
+  has_error_ = true;
+  va_list args;
+  va_start(args, format);
+  error_msg_ = zone_->VPrint(format, args);
+  ASSERT(error_msg_ != NULL);
+}
+
+
+TimelinePauses::TimelinePauses(Zone* zone,
+                               Isolate* isolate,
+                               TimelineEventEndlessRecorder* recorder)
+    : TimelineAnalysis(zone, isolate, recorder) {
+}
+
+}  // namespace dart