bneradt opened a new pull request, #12255:
URL: https://github.com/apache/trafficserver/pull/12255
This adds a gdb pretty-printer for the HttpSM history (or other History)
variables. It does the following:
* Prints the entries in order, handling the wrapping of the circular buffer
as necessary,
* Prints a human readable version of the events.
* Filers out set_next_state and the state_api_call* functions since they
don't seem to add much value.
Example (run from a frame in HttpSM):
```
(gdb) source ~bneradt/gdb-helpers.py
(gdb) p history
$50 = History(capacity=65, history_pos=124, num_entries=65) = {
HttpSM.cc:5025 do_cache_lookup_and_read
TS_EVENT_NONE (0) reent= 22,
HttpSM.cc:2088 state_send_server_request_header
TS_EVENT_VCONN_WRITE_COMPLETE (103) reent= 1,
HttpSM.cc:6361 do_setup_client_request_body_tunnel
NO_EVENT (34463) reent= 1,
HttpSM.cc:1903 state_read_server_response_header
TS_EVENT_VCONN_EOS (104) reent= 1,
HttpCacheSM.cc:104 state_cache_open_read
TS_EVENT_CACHE_OPEN_READ_FAILED (1103) reent= -31073,
HttpSM.cc:2568 state_cache_open_read
TS_EVENT_CACHE_OPEN_READ_FAILED (1103) reent= 15,
HttpSM.cc:5025 do_cache_lookup_and_read
TS_EVENT_NONE (0) reent= 14,
HttpSM.cc:1770 state_http_server_open
TS_EVENT_VCONN_EOS (104) reent= 1
}
```
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