| // 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. |
| |
| #ifndef RUNTIME_VM_SCOPE_TIMER_H_ |
| #define RUNTIME_VM_SCOPE_TIMER_H_ |
| |
| #include "platform/allocation.h" |
| #include "platform/globals.h" |
| |
| #include "vm/os.h" |
| |
| namespace dart { |
| |
| // Simple utility class for timing a block of code. |
| class ScopeTimer : public ValueObject { |
| public: |
| explicit ScopeTimer(const char* name, bool enabled = true) |
| : enabled_(enabled), name_(name), start_(0) { |
| if (!enabled_) { |
| return; |
| } |
| start_ = OS::GetCurrentMonotonicMicros(); |
| } |
| |
| int64_t GetElapsed() const { |
| int64_t end = OS::GetCurrentMonotonicMicros(); |
| ASSERT(end >= start_); |
| return end - start_; |
| } |
| |
| ~ScopeTimer() { |
| if (!enabled_) { |
| return; |
| } |
| int64_t elapsed = GetElapsed(); |
| double seconds = MicrosecondsToSeconds(elapsed); |
| OS::PrintErr("%s: %f seconds (%" Pd64 " \u00B5s)\n", name_, seconds, |
| elapsed); |
| } |
| |
| private: |
| const bool enabled_; |
| const char* name_; |
| int64_t start_; |
| }; |
| |
| } // namespace dart |
| |
| #endif // RUNTIME_VM_SCOPE_TIMER_H_ |