The command @code{info scope} (@pxref{Symbols, info scope}) is
particularly useful for figuring out what data to collect.
+@kindex teval @r{(tracepoints)}
+@item teval @var{expr1}, @var{expr2}, @dots{}
+Evaluate the given expressions when the tracepoint is hit. This
+command accepts a comma-separated list of expressions. The results
+are discarded, so this is mainly useful for assigning values to trace
+state variables (@pxref{Trace State Variables}) without adding those
+values to the trace buffer, as would be the case if the @code{collect}
+action were used.
+
@kindex while-stepping @r{(tracepoints)}
@item while-stepping @var{n}
Perform @var{n} single-step traces after the tracepoint, collecting
gdb_test "show default-collect" \
"The list of expressions to collect by default is \"gdb_char_test, gdb_long_test - 100\"..*" \
"5.9b: show default-collect"
+
+# 5.10 teval
+
+gdb_test "tvariable \$tsv" \
+ "Trace state variable \\\$tsv created, with initial value 0." \
+ "Create a trace state variable"
+
+gdb_trace_setactions "5.10a: set teval action for first tracepoint" \
+ "$trcpt1" \
+ "teval gdb_char_test" "^$"
+
+gdb_trace_setactions "5.10a: set teval action for second tracepoint" \
+ "$trcpt2" \
+ "teval \$tsv += 1" "^$"
+
+gdb_test "info tracepoints" \
+ "Num Type\[ \]+Disp Enb Address\[ \]+What.*
+\[0-9\]+\[\t \]+tracepoint keep y.* in gdb_c_test at .*$srcfile:\[0-9\]+.
+\[\t \]+A\[\t \]+teval gdb_char_test.
+\[\t \]+A\[\t \]+end.
+\[0-9\]+\[\t \]+tracepoint keep y.* in gdb_asm_test at .*$srcfile:\[0-9\]+.
+\[\t \]+A\[\t \]+teval \\\$tsv \\\+= 1.
+\[\t \]+A\[\t \]+end.
+\[0-9\]+\[\t \]+tracepoint keep y.* in gdb_recursion_test at .*$srcfile:\[0-9\]+.
+\[\t \]+A\[\t \]+collect gdb_long_test.
+\[\t \]+A\[\t \]+end." \
+ "5.10a: verify teval actions set for two tracepoints"
+
error (_("This command can only be used in a tracepoint actions list."));
}
+static void
+teval_pseudocommand (char *args, int from_tty)
+{
+ error (_("This command can only be used in a tracepoint actions list."));
+}
+
/* Enter a list of actions for a tracepoint. */
static void
trace_actions_command (char *args, int from_tty)
while (p && *p++ == ',');
return GENERIC;
}
+ else if (cmd_cfunc_eq (c, teval_pseudocommand))
+ {
+ struct agent_expr *aexpr;
+
+ do
+ { /* repeat over a comma-separated list */
+ QUIT; /* allow user to bail out with ^C */
+ while (isspace ((int) *p))
+ p++;
+
+ /* Only expressions are allowed for this action. */
+ exp = parse_exp_1 (&p, block_for_pc (t->loc->address), 1);
+ old_chain = make_cleanup (free_current_contents, &exp);
+
+ /* We have something to evaluate, make sure that the expr to
+ bytecode translator can handle it and that it's not too
+ long. */
+ aexpr = gen_eval_for_expr (t->loc->address, exp);
+ make_cleanup_free_agent_expr (aexpr);
+
+ if (aexpr->len > MAX_AGENT_EXPR_LEN)
+ error (_("expression too complicated, try simplifying"));
+
+ do_cleanups (old_chain);
+ }
+ while (p && *p++ == ',');
+ return GENERIC;
+ }
else if (cmd_cfunc_eq (c, while_stepping_pseudocommand))
{
char *steparg; /* in case warning is necessary */
}
while (action_exp && *action_exp++ == ',');
} /* if */
+ else if (cmd_cfunc_eq (cmd, teval_pseudocommand))
+ {
+ do
+ { /* repeat over a comma-separated list */
+ QUIT; /* allow user to bail out with ^C */
+ while (isspace ((int) *action_exp))
+ action_exp++;
+
+ {
+ unsigned long addr, len;
+ struct cleanup *old_chain = NULL;
+ struct cleanup *old_chain1 = NULL;
+ struct agent_reqs areqs;
+
+ exp = parse_exp_1 (&action_exp,
+ block_for_pc (t->loc->address), 1);
+ old_chain = make_cleanup (free_current_contents, &exp);
+
+ aexpr = gen_eval_for_expr (t->loc->address, exp);
+ old_chain1 = make_cleanup_free_agent_expr (aexpr);
+
+ ax_reqs (aexpr, &areqs);
+ if (areqs.flaw != agent_flaw_none)
+ error (_("malformed expression"));
+
+ if (areqs.min_height < 0)
+ error (_("gdb: Internal error: expression has min height < 0"));
+ if (areqs.max_height > 20)
+ error (_("expression too complicated, try simplifying"));
+
+ discard_cleanups (old_chain1);
+ /* Even though we're not officially collecting, add
+ to the collect list anyway. */
+ add_aexpr (collect, aexpr);
+
+ do_cleanups (old_chain);
+ } /* do */
+ }
+ while (action_exp && *action_exp++ == ',');
+ } /* if */
else if (cmd_cfunc_eq (cmd, while_stepping_pseudocommand))
{
collect = &stepping_list;
$locals -- all variables local to the block/function scope.\n\
Note: this command can only be used in a tracepoint \"actions\" list."));
+ add_com ("teval", class_trace, teval_pseudocommand, _("\
+Specify one or more expressions to be evaluated at a tracepoint.\n\
+Accepts a comma-separated list of (one or more) expressions.\n\
+The result of each evaluation will be discarded.\n\
+Note: this command can only be used in a tracepoint \"actions\" list."));
+
add_com ("actions", class_trace, trace_actions_command, _("\
Specify the actions to be taken at a tracepoint.\n\
Tracepoint actions may include collecting of specified data, \n\
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