| // Copyright 2020 The Pigweed Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| // use this file except in compliance with the License. You may obtain a copy of |
| // the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| // License for the specific language governing permissions and limitations under |
| // the License. |
| //============================================================================== |
| // BUILD |
| // ninja -C out |
| // pw_strict_host_clang_debug/obj/pw_trace_tokenized/bin/trace_tokenized_example_trigger |
| // |
| // RUN |
| // ./out/pw_strict_host_clang_debug/obj/pw_trace_tokenized/bin/trace_tokenized_example_trigger |
| // trace.bin |
| // |
| // DECODE |
| // python pw_trace_tokenized/py/trace_tokenized.py -i trace.bin -o trace.json |
| // ./out/pw_strict_host_clang_debug/obj/pw_trace_tokenized/bin/trace_tokenized_example_basic#trace |
| // |
| // VIEW |
| // In chrome navigate to chrome://tracing, and load the trace.json file. |
| |
| #include "pw_log/log.h" |
| #include "pw_trace/example/sample_app.h" |
| #include "pw_trace/trace.h" |
| #include "pw_trace_tokenized/example/trace_to_file.h" |
| #include "pw_trace_tokenized/trace_callback.h" |
| #include "pw_trace_tokenized/trace_tokenized.h" |
| |
| namespace { |
| |
| constexpr uint32_t kTriggerId = 3; |
| constexpr uint32_t kTriggerStartTraceRef = |
| PW_TRACE_REF_DATA(PW_TRACE_TYPE_ASYNC_START, |
| "Processing", // Module |
| "Job", // Label |
| PW_TRACE_FLAGS_DEFAULT, |
| "Process", |
| "@pw_py_struct_fmt:B"); |
| constexpr uint32_t kTriggerEndTraceRef = PW_TRACE_REF(PW_TRACE_TYPE_ASYNC_END, |
| "Processing", // Module |
| "Job", // Label |
| PW_TRACE_FLAGS_DEFAULT, |
| "Process"); |
| |
| } // namespace |
| |
| pw_trace_TraceEventReturnFlags TraceEventCallback( |
| void* /* user_data */, |
| uint32_t trace_ref, |
| pw_trace_EventType /* event_type */, |
| const char* /* module */, |
| uint32_t trace_id, |
| uint8_t /* flags */) { |
| if (trace_ref == kTriggerStartTraceRef && trace_id == kTriggerId) { |
| PW_LOG_INFO("Trace capture started!"); |
| PW_TRACE_SET_ENABLED(true); |
| } |
| if (trace_ref == kTriggerEndTraceRef && trace_id == kTriggerId) { |
| PW_LOG_INFO("Trace capture ended!"); |
| return PW_TRACE_EVENT_RETURN_FLAGS_DISABLE_AFTER_PROCESSING; |
| } |
| return 0; |
| } |
| |
| int main(int argc, char** argv) { // Take filename as arg |
| if (argc != 2) { |
| PW_LOG_ERROR("Expected output file name as argument.\n"); |
| return -1; |
| } |
| |
| // Register trigger callback |
| pw::trace::Callbacks::Instance() |
| .RegisterEventCallback(TraceEventCallback, |
| pw::trace::CallbacksImpl::kCallOnEveryEvent) |
| .IgnoreError(); // TODO(pwbug/387): Handle Status properly |
| |
| // Ensure tracing is off at start, the trigger will turn it on. |
| PW_TRACE_SET_ENABLED(false); |
| |
| // Dump trace data to the file passed in. |
| pw::trace::TraceToFile trace_to_file(argv[1]); |
| |
| PW_LOG_INFO("Running trigger example..."); |
| RunTraceSampleApp(); |
| return 0; |
| } |