Robert Oliver | 81e6e3e | 2020-06-25 14:43:40 -0400 | [diff] [blame] | 1 | // Copyright 2020 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 | // |
| 16 | #include "pw_trace_tokenized/trace_buffer.h" |
| 17 | |
| 18 | #include <span> |
| 19 | |
| 20 | #include "pw_ring_buffer/prefixed_entry_ring_buffer.h" |
| 21 | #include "pw_trace_tokenized/trace_callback.h" |
| 22 | |
| 23 | namespace pw { |
| 24 | namespace trace { |
| 25 | namespace { |
| 26 | |
| 27 | class TraceBuffer { |
| 28 | public: |
| 29 | TraceBuffer() { |
| 30 | ring_buffer_.SetBuffer(raw_buffer_); |
| 31 | Callbacks::Instance().RegisterSink( |
| 32 | TraceSinkStartBlock, TraceSinkAddBytes, TraceSinkEndBlock, this); |
| 33 | } |
| 34 | |
| 35 | static void TraceSinkStartBlock(void* user_data, size_t size) { |
| 36 | TraceBuffer* buffer = reinterpret_cast<TraceBuffer*>(user_data); |
| 37 | if (size > PW_TRACE_BUFFER_MAX_BLOCK_SIZE_BYTES) { |
| 38 | buffer->block_size_ = 0; // Skip this block |
| 39 | return; |
| 40 | } |
| 41 | buffer->block_size_ = static_cast<uint16_t>(size); |
| 42 | buffer->block_idx_ = 0; |
| 43 | } |
| 44 | |
| 45 | static void TraceSinkAddBytes(void* user_data, |
| 46 | const void* bytes, |
| 47 | size_t size) { |
| 48 | TraceBuffer* buffer = reinterpret_cast<TraceBuffer*>(user_data); |
| 49 | if (buffer->block_size_ == 0 || |
| 50 | buffer->block_idx_ + size > buffer->block_size_) { |
| 51 | return; // Block is too large, skipping. |
| 52 | } |
| 53 | memcpy(&buffer->current_block_[buffer->block_idx_], bytes, size); |
| 54 | buffer->block_idx_ += size; |
| 55 | } |
| 56 | |
| 57 | static void TraceSinkEndBlock(void* user_data) { |
| 58 | TraceBuffer* buffer = reinterpret_cast<TraceBuffer*>(user_data); |
| 59 | if (buffer->block_idx_ != buffer->block_size_) { |
| 60 | return; // Block is too large, skipping. |
| 61 | } |
| 62 | buffer->ring_buffer_.PushBack(std::span<const std::byte>( |
| 63 | &buffer->current_block_[0], buffer->block_size_)); |
| 64 | } |
| 65 | |
| 66 | pw::ring_buffer::PrefixedEntryRingBuffer& RingBuffer() { |
| 67 | return ring_buffer_; |
| 68 | }; |
| 69 | |
| 70 | private: |
| 71 | uint16_t block_size_ = 0; |
| 72 | uint16_t block_idx_ = 0; |
| 73 | std::byte current_block_[PW_TRACE_BUFFER_MAX_BLOCK_SIZE_BYTES]; |
| 74 | std::byte raw_buffer_[PW_TRACE_BUFFER_SIZE_BYTES]; |
| 75 | pw::ring_buffer::PrefixedEntryRingBuffer ring_buffer_{false}; |
| 76 | }; |
| 77 | |
| 78 | #if PW_TRACE_BUFFER_SIZE_BYTES > 0 |
| 79 | TraceBuffer trace_buffer_instance; |
| 80 | #endif // PW_TRACE_BUFFER_SIZE_BYTES > 0 |
| 81 | |
| 82 | } // namespace |
| 83 | |
| 84 | void ClearBuffer() { trace_buffer_instance.RingBuffer().Clear(); } |
| 85 | |
| 86 | pw::ring_buffer::PrefixedEntryRingBuffer* GetBuffer() { |
| 87 | return &trace_buffer_instance.RingBuffer(); |
| 88 | } |
| 89 | |
| 90 | } // namespace trace |
| 91 | } // namespace pw |