Eric Seckler | 7631120 | 2019-01-07 12:20:25 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "perfetto/protozero/scattered_heap_buffer.h" |
| 18 | |
Eric Seckler | fae9006 | 2019-01-07 15:21:19 +0000 | [diff] [blame] | 19 | #include <algorithm> |
| 20 | |
Eric Seckler | 7631120 | 2019-01-07 12:20:25 +0000 | [diff] [blame] | 21 | namespace protozero { |
| 22 | |
Sami Kyostila | be5d0e3 | 2019-11-07 12:53:25 +0000 | [diff] [blame] | 23 | ScatteredHeapBuffer::Slice::Slice() |
| 24 | : buffer_(nullptr), size_(0u), unused_bytes_(0u) {} |
| 25 | |
Eric Seckler | 7631120 | 2019-01-07 12:20:25 +0000 | [diff] [blame] | 26 | ScatteredHeapBuffer::Slice::Slice(size_t size) |
| 27 | : buffer_(std::unique_ptr<uint8_t[]>(new uint8_t[size])), |
| 28 | size_(size), |
| 29 | unused_bytes_(size) { |
| 30 | PERFETTO_DCHECK(size); |
Sami Kyostila | be5d0e3 | 2019-11-07 12:53:25 +0000 | [diff] [blame] | 31 | Clear(); |
Eric Seckler | 7631120 | 2019-01-07 12:20:25 +0000 | [diff] [blame] | 32 | } |
| 33 | |
| 34 | ScatteredHeapBuffer::Slice::Slice(Slice&& slice) noexcept = default; |
| 35 | |
| 36 | ScatteredHeapBuffer::Slice::~Slice() = default; |
| 37 | |
Sami Kyostila | be5d0e3 | 2019-11-07 12:53:25 +0000 | [diff] [blame] | 38 | ScatteredHeapBuffer::Slice& ScatteredHeapBuffer::Slice::operator=(Slice&&) = |
| 39 | default; |
| 40 | |
| 41 | void ScatteredHeapBuffer::Slice::Clear() { |
| 42 | unused_bytes_ = size_; |
| 43 | #if PERFETTO_DCHECK_IS_ON() |
| 44 | memset(start(), 0xff, size_); |
| 45 | #endif // PERFETTO_DCHECK_IS_ON() |
| 46 | } |
| 47 | |
Eric Seckler | 7631120 | 2019-01-07 12:20:25 +0000 | [diff] [blame] | 48 | ScatteredHeapBuffer::ScatteredHeapBuffer(size_t initial_slice_size_bytes, |
| 49 | size_t maximum_slice_size_bytes) |
| 50 | : next_slice_size_(initial_slice_size_bytes), |
| 51 | maximum_slice_size_(maximum_slice_size_bytes) { |
| 52 | PERFETTO_DCHECK(next_slice_size_ && maximum_slice_size_); |
| 53 | PERFETTO_DCHECK(maximum_slice_size_ >= initial_slice_size_bytes); |
| 54 | } |
| 55 | |
| 56 | ScatteredHeapBuffer::~ScatteredHeapBuffer() = default; |
| 57 | |
| 58 | protozero::ContiguousMemoryRange ScatteredHeapBuffer::GetNewBuffer() { |
| 59 | PERFETTO_CHECK(writer_); |
| 60 | AdjustUsedSizeOfCurrentSlice(); |
| 61 | |
Sami Kyostila | be5d0e3 | 2019-11-07 12:53:25 +0000 | [diff] [blame] | 62 | if (cached_slice_.start()) { |
| 63 | slices_.push_back(std::move(cached_slice_)); |
| 64 | PERFETTO_DCHECK(!cached_slice_.start()); |
| 65 | } else { |
| 66 | slices_.emplace_back(next_slice_size_); |
| 67 | } |
Eric Seckler | 7631120 | 2019-01-07 12:20:25 +0000 | [diff] [blame] | 68 | next_slice_size_ = std::min(maximum_slice_size_, next_slice_size_ * 2); |
| 69 | return slices_.back().GetTotalRange(); |
| 70 | } |
| 71 | |
| 72 | std::vector<uint8_t> ScatteredHeapBuffer::StitchSlices() { |
| 73 | AdjustUsedSizeOfCurrentSlice(); |
| 74 | std::vector<uint8_t> buffer; |
Eric Seckler | 7631120 | 2019-01-07 12:20:25 +0000 | [diff] [blame] | 75 | for (const auto& slice : slices_) { |
| 76 | auto used_range = slice.GetUsedRange(); |
| 77 | buffer.insert(buffer.end(), used_range.begin, used_range.end); |
Eric Seckler | 7631120 | 2019-01-07 12:20:25 +0000 | [diff] [blame] | 78 | } |
| 79 | return buffer; |
| 80 | } |
| 81 | |
Sami Kyostila | be5d0e3 | 2019-11-07 12:53:25 +0000 | [diff] [blame] | 82 | std::vector<protozero::ContiguousMemoryRange> ScatteredHeapBuffer::GetRanges() { |
| 83 | AdjustUsedSizeOfCurrentSlice(); |
| 84 | std::vector<protozero::ContiguousMemoryRange> ranges; |
| 85 | for (const auto& slice : slices_) |
| 86 | ranges.push_back(slice.GetUsedRange()); |
| 87 | return ranges; |
| 88 | } |
| 89 | |
Eric Seckler | 7631120 | 2019-01-07 12:20:25 +0000 | [diff] [blame] | 90 | void ScatteredHeapBuffer::AdjustUsedSizeOfCurrentSlice() { |
| 91 | if (!slices_.empty()) |
| 92 | slices_.back().set_unused_bytes(writer_->bytes_available()); |
| 93 | } |
| 94 | |
| 95 | size_t ScatteredHeapBuffer::GetTotalSize() { |
| 96 | size_t total_size = 0; |
| 97 | for (auto& slice : slices_) { |
| 98 | total_size += slice.size(); |
| 99 | } |
| 100 | return total_size; |
| 101 | } |
| 102 | |
Sami Kyostila | be5d0e3 | 2019-11-07 12:53:25 +0000 | [diff] [blame] | 103 | void ScatteredHeapBuffer::Reset() { |
| 104 | if (slices_.empty()) |
| 105 | return; |
| 106 | cached_slice_ = std::move(slices_.front()); |
| 107 | cached_slice_.Clear(); |
| 108 | slices_.clear(); |
| 109 | } |
| 110 | |
Eric Seckler | 7631120 | 2019-01-07 12:20:25 +0000 | [diff] [blame] | 111 | } // namespace protozero |