Explicit locations: introduce address locations

[deliverable/binutils-gdb.git] / gdb / location.h

/* Data structures and API for event locations in GDB.
   Copyright (C) 2013-2015 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef LOCATIONS_H
#define LOCATIONS_H 1

struct language_defn;
struct event_location;

/* An enumeration of the various ways to specify a stop event
   location (used with create_breakpoint).  */

enum event_location_type
{
  /* A traditional linespec.  */
  LINESPEC_LOCATION,

  /* An address in the inferior.  */
  ADDRESS_LOCATION
};

/* Return the type of the given event location.  */

extern enum event_location_type
  event_location_type (const struct event_location *);

/* Return a string representation of the LOCATION.
   This function may return NULL for unspecified linespecs,
   e.g, LOCATION_LINESPEC and addr_string is NULL.

   The result is cached in LOCATION.  */

extern const char *
  event_location_to_string (struct event_location *location);

/* Create a new linespec location.  The return result is malloc'd
   and should be freed with delete_event_location.  */

extern struct event_location *
  new_linespec_location (char **linespec);

/* Return the linespec location (a string) of the given event_location
   (which must be of type LINESPEC_LOCATION).  */

extern const char *
  get_linespec_location (const struct event_location *location);

/* Create a new address location.  The return result is malloc'd
   and should be freed with delete_event_location.  */

extern struct event_location *
  new_address_location (CORE_ADDR addr);

/* Return the address location (a CORE_ADDR) of the given event_location
   (which must be of type ADDRESS_LOCATION).  */

extern CORE_ADDR
  get_address_location (const struct event_location *location);

/* Free an event location and any associated data.  */

extern void delete_event_location (struct event_location *location);

/* Make a cleanup to free LOCATION.  */

extern struct cleanup *
  make_cleanup_delete_event_location (struct event_location *location);

/* Return a copy of the given SRC location.  */

extern struct event_location *
  copy_event_location (const struct event_location *src);

/* Attempt to convert the input string in *ARGP into an event_location.
   ARGP is advanced past any processed input.  Returns an event_location
   (malloc'd) if an event location was successfully found in *ARGP,
   NULL otherwise.

   This function may call error() if *ARGP looks like properly formed,
   but invalid, input, e.g., if it is called with missing argument parameters
   or invalid options.

   The return result must be freed with delete_event_location.  */

extern struct event_location *
  string_to_event_location (char **argp,
			    const struct language_defn *langauge);

/* A convenience function for testing for unset locations.  */

extern int event_location_empty_p (const struct event_location *location);

/* Set the location's string representation.  If STRING is NULL, clear
   the string representation.  */

extern void
  set_event_location_string (struct event_location *location,
			     const char *string);
#endif /* LOCATIONS_H */