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Revision 1.12, Wed Sep 8 13:29:51 2021 UTC (2 years, 8 months ago) by dv
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1, OPENBSD_7_0_BASE, OPENBSD_7_0, HEAD
Changes since 1.11: +0 -2 lines

btrace(8): add initial support for cli arguments

This adds initial support for passing cli args to btrace(8) for use
in bt(5) scripts. Similar to bpftrace, they are referenced via $1,
$2, etc. with $# being the number of command line arguments provided.

Adds an initial regress test and a Makefile change to allow providing
arguments to regress tests in a .args file.

Currently no limit is imposed on the number of arguments, keeping
a similar approach as observed in bpftrace. References to undefined
arguments result in a new "nil" type that contextually acts as a
zero or empty string. More work can be done here to improve bpftrace
compatibility.

ok mpi@, jasper@

Missing feature:

- Option "-c command" to run `command' and use its PID as filter.

Missing language features:

- if/else
- `args', tracepoint arguments support (requires kernel work)
- str(args->buf, args->count)

Improvements:

- rewrite stmt_printf() to not use strings internally
- look at collision in map hash