commit d25d1601b5ac9e2767e0f14f89e3e24e405927e5
author Enrico Deiana <edeiana@google.com> Fri Jun 07 16:07:18 2024
committer GitHub <noreply@github.com> Fri Jun 07 16:07:18 2024
tree 563aaefeb33071619c7691bbeaf004887c441836
parent 2842570c5ff107e551e8ec88def0b774d8dfc3d1

i#6662 public traces, part 5: func_id_filter_t (#6820)

Adds a new filter: `func_id_filter_t` to record_filter, which filters
TRACE_MARKER_TYPE_FUNC_ markers based on the function ID.

The filter is enabled by `-filter_keep_func_ids` followed by a list of
integers that represent the function IDs bound to
TRACE_MARKER_TYPE_FUNC_ markers to keep in the trace.
Specifically, whenever we encounter a TRACE_MARKER_TYPE_FUNC_ID marker
whose marker value is in the list we set a per-shard flag to indicate
that all TRACE_MARKER_TYPE_FUNC_[ID | ARG | RETVAL | RETADDR] markers
related to that function ID need to be preserved. We remove the
TRACE_MARKER_TYPE_FUNC_ markers related to functions whose ID is not in
the list.

This filter can be invoked with:
```
drrun -t drmemtrace -tool record_filter -filter_keep_func_ids 1,2,3,4 -indir path/to/input/trace -outdir path/to/output/trace
```
To preserve TRACE_MARKER_TYPE_FUNC_ markers related to functions with
ID: 1, 2, 3, 4, and remove the TRACE_MARKER_TYPE_FUNC_ markers for all
other ID values.

We use this filter to preserve markers related to SYS_futex functions in
the public release of traces.

Issue #6662