13.3 Convenience Variables for Tracepoints

(int) $trace_frame

The current trace snapshot (a.k.a. frame) number, or -1 if no snapshot is selected.

(int) $tracepoint

The tracepoint for the current trace snapshot.

(int) $trace_line

The line number for the current trace snapshot.

(char []) $trace_file

The source file for the current trace snapshot.

(char []) $trace_func

The name of the function containing $tracepoint.

Note: $trace_file is not suitable for use in printf, use output instead.

Here’s a simple example of using these convenience variables for stepping through all the trace snapshots and printing some of their data. Note that these are not the same as trace state variables, which are managed by the target.

(gdb) tfind start

(gdb) while $trace_frame != -1
> output $trace_file
> printf ", line %d (tracepoint #%d)\n", $trace_line, $tracepoint
> tfind
> end