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34add230f6
This flag allows dumping timings of various precompiler passes. TEST=precompiled dart2js with --print-precompiler-timings Change-Id: I54d6fdf26c25a0e43ae4f2717e833e09e9321d81 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/198407 Commit-Queue: Vyacheslav Egorov <vegorov@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com>
51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_SCOPE_TIMER_H_
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#define RUNTIME_VM_SCOPE_TIMER_H_
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#include "platform/allocation.h"
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#include "platform/globals.h"
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#include "vm/os.h"
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namespace dart {
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// Simple utility class for timing a block of code.
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class ScopeTimer : public ValueObject {
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public:
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explicit ScopeTimer(const char* name, bool enabled = true)
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: enabled_(enabled), name_(name), start_(0) {
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if (!enabled_) {
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return;
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}
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start_ = OS::GetCurrentMonotonicMicros();
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}
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int64_t GetElapsed() const {
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int64_t end = OS::GetCurrentMonotonicMicros();
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ASSERT(end >= start_);
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return end - start_;
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}
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~ScopeTimer() {
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if (!enabled_) {
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return;
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}
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int64_t elapsed = GetElapsed();
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double seconds = MicrosecondsToSeconds(elapsed);
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OS::PrintErr("%s: %.2f seconds (%" Pd64 " \u00B5s)\n", name_, seconds,
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elapsed);
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}
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private:
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const bool enabled_;
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const char* name_;
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int64_t start_;
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};
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} // namespace dart
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#endif // RUNTIME_VM_SCOPE_TIMER_H_
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