trace
locationtrace
command is very similar to the break
command.
Its argument location can be a source line, a function name, or
an address in the target program. See Specify Location. The
trace
command defines a tracepoint, which is a point in the
target program where the debugger will briefly stop, collect some
data, and then allow the program to continue. Setting a tracepoint or
changing its actions doesn't take effect until the next tstart
command, and once a trace experiment is running, further changes will
not have any effect until the next trace experiment starts.
Here are some examples of using the trace
command:
(gdb) trace foo.c:121 // a source file and line number (gdb) trace +2 // 2 lines forward (gdb) trace my_function // first source line of function (gdb) trace *my_function // EXACT start address of function (gdb) trace *0x2117c4 // an address
You can abbreviate trace
as tr
.
The convenience variable $tpnum
records the tracepoint number
of the most recently set tracepoint.
delete tracepoint
[num]delete
command can remove tracepoints also.
Examples:
(gdb) delete trace 1 2 3 // remove three tracepoints (gdb) delete trace // remove all tracepoints
You can abbreviate this command as del tr
.