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 // BUILD
16 // ninja -C out
17 // pw_strict_host_clang_debug/obj/pw_trace_tokenized/bin/trace_tokenized_example_filter
18 //
19 // RUN
20 // ./out/pw_strict_host_clang_debug/obj/pw_trace_tokenized/bin/trace_tokenized_example_filter
21 // trace.bin
22 //
23 // DECODE
24 // python pw_trace_tokenized/py/trace_tokenized.py -i trace.bin -o trace.json
25 // ./out/pw_strict_host_clang_debug/obj/pw_trace_tokenized/bin/trace_tokenized_example_basic#trace
26 //
27 // VIEW
28 // In chrome navigate to chrome://tracing, and load the trace.json file.
29
30 #include "pw_log/log.h"
31 #include "pw_trace/example/sample_app.h"
32 #include "pw_trace/trace.h"
33 #include "pw_trace_tokenized/example/trace_to_file.h"
34 #include "pw_trace_tokenized/trace_callback.h"
35 #include "pw_trace_tokenized/trace_tokenized.h"
36
TraceEventCallback(void *,uint32_t,pw_trace_EventType,const char * module,uint32_t trace_id,uint8_t)37 pw_trace_TraceEventReturnFlags TraceEventCallback(
38 void* /* user_data */,
39 uint32_t /* trace_ref */,
40 pw_trace_EventType /* event_type */,
41 const char* module,
42 uint32_t trace_id,
43 uint8_t /* flags */) {
44 // Filter out all traces from processing task, which aren't traceId 3
45 static constexpr uint32_t kFilterId = 3;
46 return (strcmp("Processing", module) == 0 && trace_id != kFilterId)
47 ? PW_TRACE_EVENT_RETURN_FLAGS_SKIP_EVENT
48 : 0;
49 }
50
main(int argc,char ** argv)51 int main(int argc, char** argv) { // Take filename as arg
52 if (argc != 2) {
53 PW_LOG_ERROR("Expected output file name as argument.\n");
54 return -1;
55 }
56
57 // Register filter callback
58 pw::trace::Callbacks::Instance()
59 .RegisterEventCallback(TraceEventCallback)
60 .IgnoreError(); // TODO(pwbug/387): Handle Status properly
61
62 PW_TRACE_SET_ENABLED(true); // Start with tracing enabled
63
64 // Dump trace data to the file passed in.
65 pw::trace::TraceToFile trace_to_file(argv[1]);
66
67 PW_LOG_INFO("Running filter example...");
68 RunTraceSampleApp();
69 return 0;
70 }
71