d365f62ec1
Add a new abstract class TraceEventListener which is just an interface for consuming trace events. This separates the V8-specific stuff that an actual perfetto consumer needs to do e.g. handling the has_more flag and signalling back to the controller with a semaphore. This is a change from the previous plan of making the PerfettoConsumer class sub-classable to implement custom consumption of trace events. This will be difficult when the consumer is created outside of the PerfettoTracingController as we can't hook up the consumer_finished_semaphore_ that belongs to the controller. Now the PerfettoTracingController is responsible for the Consumer life- cycle and hides it entirely from callers. We add the AddTraceEventListener() method to allow callers to register a listener either for testing or a JSON listener for real tracing. This lets us write tests that can store all the trace events in memory without first converting them to JSON, letting us write test more easily. There's an example test add to test-tracing - more tests using this style will follow. Cq-Include-Trybots: luci.v8.try:v8_linux64_perfetto_dbg_ng Bug: v8:8339 Change-Id: I2d2b0f408b1c7bed954144163e1968f40d772c1b Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1628789 Commit-Queue: Ulan Degenbaev <ulan@chromium.org> Auto-Submit: Peter Marshall <petermarshall@chromium.org> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Reviewed-by: Jakob Gruber <jgruber@chromium.org> Cr-Commit-Position: refs/heads/master@{#61854} |
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| DEPS | ||
| libplatform-export.h | ||
| libplatform.h | ||
| v8-tracing.h | ||