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Add a new $_inferior convenience variable

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Like $_thread, but holds the current inferior number.

gdb/ChangeLog:
2016-01-13  Pedro Alves  <palves@redhat.com>

	* NEWS: Mention $_inferior.
	* inferior.c (inferior_id_make_value): New.
	(inferior_funcs): New.
	(_initialize_inferior): Create $_inferior variable.

gdb/testsuite/ChangeLog:
2016-01-13  Pedro Alves  <palves@redhat.com>

	* gdb.base/default.exp: Expect $_inferior as well.
	* gdb.multi/base.exp: Test $_inferior.

gdb/doc/ChangeLog:
2016-01-13  Pedro Alves  <palves@redhat.com>

	* gdb.texinfo (Inferiors and Programs): Document the $_inferior
	convenience variable.
	(Convenience Vars): Likewise.
This commit is contained in:
Pedro Alves 2016-01-13 10:56:05 +00:00
parent a911d87ad7
commit e3940304fe
8 changed files with 57 additions and 0 deletions
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21
gdb/inferior.c
View file

@ -1008,6 +1008,26 @@ show_print_inferior_events (struct ui_file *file, int from_tty,
fprintf_filtered (file, _("Printing of inferior events is %s.\n"), value);
}
/* Return a new value for the selected inferior's id. */
static struct value *
inferior_id_make_value (struct gdbarch *gdbarch, struct internalvar *var,
void *ignore)
{
struct inferior *inf = current_inferior ();
return value_from_longest (builtin_type (gdbarch)->builtin_int, inf->num);
}
/* Implementation of `$_inferior' variable. */
static const struct internalvar_funcs inferior_funcs =
{
inferior_id_make_value,
NULL,
NULL
};
void
@ -1071,4 +1091,5 @@ Show printing of inferior events (e.g., inferior start and exit)."), NULL,
show_print_inferior_events,
&setprintlist, &showprintlist);
create_internalvar_type_lazy ("_inferior", &inferior_funcs, NULL);
}