1 // Copyright (C) 2023 Huawei Device Co., Ltd.
2 // Licensed under the Apache License, Version 2.0 (the "License");
3 // you may not use this file except in compliance with the License.
4 // You may obtain a copy of the License at
5 //
6 //     http://www.apache.org/licenses/LICENSE-2.0
7 //
8 // Unless required by applicable law or agreed to in writing, software
9 // distributed under the License is distributed on an "AS IS" BASIS,
10 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 // See the License for the specific language governing permissions and
12 // limitations under the License.
13 
14 /// Hitrace adapter which provides timing capability.
15 ///
16 /// The timing will end automatically when the structure drops. Users should
17 /// take care that the lifetime of this structure.
18 pub(crate) struct Trace;
19 
20 impl Trace {
21     // Copies from `Hitrace`.
22     const HITRACE_TAG_MISC: u64 = 1u64 << 41;
23 
24     /// Starts tracing.
new(value: &str) -> Self25     pub(crate) fn new(value: &str) -> Self {
26         hitrace_meter_rust::start_trace(Self::HITRACE_TAG_MISC, value);
27         Self
28     }
29 }
30 
31 impl Drop for Trace {
32     /// Stops tracing.
drop(&mut self)33     fn drop(&mut self) {
34         hitrace_meter_rust::finish_trace(Self::HITRACE_TAG_MISC);
35     }
36 }
37