+\f
+
+/* This is called to compute the value of one of the $_probe_arg*
+ convenience variables. */
+
+static struct value *
+compute_probe_arg (struct gdbarch *arch, struct internalvar *ivar,
+ void *data)
+{
+ struct frame_info *frame = get_selected_frame (_("No frame selected"));
+ CORE_ADDR pc = get_frame_pc (frame);
+ int sel = (int) (uintptr_t) data;
+ struct bound_probe pc_probe;
+ unsigned n_args;
+
+ /* SEL == -1 means "_probe_argc". */
+ gdb_assert (sel >= -1);
+
+ pc_probe = find_probe_by_pc (pc);
+ if (pc_probe.prob == NULL)
+ error (_("No probe at PC %s"), core_addr_to_string (pc));
+
+ n_args = pc_probe.prob->get_argument_count (frame);
+ if (sel == -1)
+ return value_from_longest (builtin_type (arch)->builtin_int, n_args);
+
+ if (sel >= n_args)
+ error (_("Invalid probe argument %d -- probe has %u arguments available"),
+ sel, n_args);
+
+ return pc_probe.prob->evaluate_argument (sel, frame);
+}
+
+/* This is called to compile one of the $_probe_arg* convenience
+ variables into an agent expression. */
+
+static void
+compile_probe_arg (struct internalvar *ivar, struct agent_expr *expr,
+ struct axs_value *value, void *data)
+{
+ CORE_ADDR pc = expr->scope;
+ int sel = (int) (uintptr_t) data;
+ struct bound_probe pc_probe;
+ int n_args;
+ struct frame_info *frame = get_selected_frame (NULL);
+
+ /* SEL == -1 means "_probe_argc". */
+ gdb_assert (sel >= -1);
+
+ pc_probe = find_probe_by_pc (pc);
+ if (pc_probe.prob == NULL)
+ error (_("No probe at PC %s"), core_addr_to_string (pc));
+
+ n_args = pc_probe.prob->get_argument_count (frame);
+
+ if (sel == -1)
+ {
+ value->kind = axs_rvalue;
+ value->type = builtin_type (expr->gdbarch)->builtin_int;
+ ax_const_l (expr, n_args);
+ return;
+ }
+
+ gdb_assert (sel >= 0);
+ if (sel >= n_args)
+ error (_("Invalid probe argument %d -- probe has %d arguments available"),
+ sel, n_args);
+
+ pc_probe.prob->compile_to_ax (expr, value, sel);
+}
+
+static const struct internalvar_funcs probe_funcs =
+{
+ compute_probe_arg,
+ compile_probe_arg,
+ NULL
+};
+