Revert r32930 (Add more timing information in the VM to track time...)

runtime/vm/timer_scope.h

-// Copyright (c) 2014, 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.
-
-#ifndef VM_TIMER_SCOPE_H_
-#define VM_TIMER_SCOPE_H_
-
-#include "vm/allocation.h"
-#include "vm/flags.h"
-#include "vm/os.h"
-#include "vm/timer.h"
-
-namespace dart {
-
-// Transition from executing VM code to executing Native code.
-class VmToNativeTimerScope : public ValueObject {
- public:
-  explicit VmToNativeTimerScope(Isolate* isolate) {
-    native_timer_ = &(isolate->timer_list().time_native_execution());
-    native_timer_->Start();
-  }
-  ~VmToNativeTimerScope() {
-    native_timer_->Stop();
-  }
-
- private:
-  Timer* native_timer_;
-  DISALLOW_COPY_AND_ASSIGN(VmToNativeTimerScope);
-};
-
-// Transition from executing Native code to executing VM code.
-class NativeToVmTimerScope : public ValueObject {
- public:
-  explicit NativeToVmTimerScope(Isolate* isolate)
-      : dart_running_(false),
-        timer_list_(&(isolate->timer_list())) {
-    Timer* dart_timer = &(timer_list_->time_dart_execution());
-    // Currently when a native function is setup without the auto scope
-    // setup parameter (leaf function) we would have the dart timer still
-    // running as we have not done any transitioning. If for some reason
-    // such a native function makes API call backs we should account for
-    // that.
-    if (dart_timer->running()) {
-      dart_running_ = true;
-      dart_timer->Stop();
-    } else {
-      Timer* native_timer = &(timer_list_->time_native_execution());
-      native_timer->Stop();
-    }
-  }
-  ~NativeToVmTimerScope() {
-    if (dart_running_) {
-      Timer* dart_timer = &(timer_list_->time_dart_execution());
-      dart_timer->Start();
-    } else {
-      Timer* native_timer = &(timer_list_->time_native_execution());
-      native_timer->Start();
-    }
-  }
-
- private:
-  bool dart_running_;
-  TimerList* timer_list_;
-  DISALLOW_COPY_AND_ASSIGN(NativeToVmTimerScope);
-};
-
-// Transition from executing Dart code to executing Native code.
-class DartToNativeTimerScope : public ValueObject {
- public:
-  explicit DartToNativeTimerScope(Isolate* isolate) {
-    dart_timer_ = &(isolate->timer_list().time_dart_execution());
-    native_timer_ = &(isolate->timer_list().time_native_execution());
-    dart_timer_->Stop();
-    native_timer_->Start();
-  }
-  ~DartToNativeTimerScope() {
-    native_timer_->Stop();
-    dart_timer_->Start();
-  }
-
- private:
-  Timer* native_timer_;
-  Timer* dart_timer_;
-  DISALLOW_COPY_AND_ASSIGN(DartToNativeTimerScope);
-};
-
-// Transition from executing Dart code to executing VM code.
-class DartToVmTimerScope : public ValueObject {
- public:
-  explicit DartToVmTimerScope(Isolate* isolate) {
-    dart_timer_ = &(isolate->timer_list().time_dart_execution());
-    dart_timer_->Stop();
-  }
-  ~DartToVmTimerScope() {
-    dart_timer_->Start();
-  }
-
- private:
-  Timer* dart_timer_;
-  DISALLOW_COPY_AND_ASSIGN(DartToVmTimerScope);
-};
-
-// The class TimerScope is used to start and stop a timer within a scope.
-// It is used as follows:
-// {
-//   TIMERSCOPE(name_of_timer);
-//   ....
-//   .....
-//   code that needs to be timed.
-//   ....
-// }
-class TimerScope : public StackResource {
- public:
-  TimerScope(bool flag, Timer* timer, BaseIsolate* isolate)
-      : StackResource(isolate), flag_(flag), nested_(false), timer_(timer) {
-    if (flag_) {
-      if (!timer_->running()) {
-        timer_->Start();
-      } else {
-        nested_ = true;
-      }
-    }
-  }
-  ~TimerScope() {
-    if (flag_) {
-      if (!nested_) {
-        timer_->Stop();
-      }
-    }
-  }
-
- private:
-  bool flag_;
-  bool nested_;
-  Timer* timer_;
-  DISALLOW_COPY_AND_ASSIGN(TimerScope);
-};
-
-#define TIMERSCOPE(isolate, name)                                              \
-  TimerScope vm_internal_timer_(true, &(isolate->timer_list().name()), isolate)
-
-}  // namespace dart
-
-#endif  // VM_TIMER_SCOPE_H_