1 // Copyright 2023 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14
15 #include "pw_bluetooth_sapphire/internal/host/common/retire_log.h"
16
17 #include <limits>
18
19 namespace bt::internal {
20
RetireLog(size_t min_depth,size_t max_depth)21 RetireLog::RetireLog(size_t min_depth, size_t max_depth)
22 : min_depth_(min_depth), max_depth_(max_depth) {
23 BT_ASSERT(min_depth_ > 0);
24 BT_ASSERT(min_depth_ <= max_depth_);
25
26 // For simplicity, log indexes are computed with doubles, so limit the depth
27 // to 2**53 in which precision is preserved, assuming IEEE-754 DPFPs.
28 BT_ASSERT(max_depth_ <=
29 (decltype(max_depth_){1} << std::numeric_limits<double>::digits));
30 buffer_.reserve(max_depth_);
31 std::apply(
32 [this](auto&... scratchpad) { (scratchpad.reserve(max_depth_), ...); },
33 quantile_scratchpads_);
34 }
35
Retire(size_t byte_count,pw::chrono::SystemClock::duration age)36 void RetireLog::Retire(size_t byte_count,
37 pw::chrono::SystemClock::duration age) {
38 if (depth() < max_depth_) {
39 buffer_.push_back({byte_count, age});
40 return;
41 }
42 buffer_[next_insertion_index_] = {byte_count, age};
43 next_insertion_index_ = (next_insertion_index_ + 1) % depth();
44 }
45
46 } // namespace bt::internal
47