Explicit locations: use new location API

This patch converts the code base to use the new struct event_location
API being introduced. This patch preserves the current functionality and
adds no new features.

The "big picture" API usage introduced by this patch may be illustrated
with a simple exmaple. Where previously developers would write:

void
my_command (char *arg, int from_tty)
{
   create_breakpoint (..., arg, ...);
   ...
}

one now uses:

void
my_command (char *arg, int from_tty)
{
   struct event_locaiton *location;
   struct cleanup *back_to;

   location = string_to_event_locaiton (&arg, ...);
   back_to = make_cleanup_delete_event_location (location);
   create_breakpoint (..., location, ...);
   do_cleanups (back_to);
}

Linespec-decoding functions (now called location-decoding) such as
decode_line_full no longer skip argument pointers over processed input.
That functionality has been moved into string_to_event_location as
demonstrated above.

gdb/ChangeLog

	* ax-gdb.c: Include location.h.
	(agent_command_1) Use linespec location instead of address
	string.
	* break-catch-throw.c: Include location.h.
	(re_set_exception_catchpoint): Use linespec locations instead
	of address strings.
	* breakpoint.c: Include location.h.
	(create_overlay_event_breakpoint, create_longjmp_master_breakpoint)
	(create_std_terminate_master_breakpoint)
	(create_exception_master_breakpoint, update_breakpoints_after_exec):
	Use linespec location instead of address string.
	(print_breakpoint_location):  Use locations and
	event_location_to_string.
	Print extra_string for pending locations for non-MI streams.
	(print_one_breakpoint_location): Use locations and
	event_location_to_string.
	(init_raw_breakpoint_without_location): Initialize b->location.
	(create_thread_event_breakpoint): Use linespec location instead of
	address string.
	(init_breakpoint_sal): Likewise.
	Only save extra_string if it is non-NULL and not the empty string.
	Use event_location_to_string instead of `addr_string'.
	Constify `p' and `endp'.
	Use skip_spaces_const/skip_space_const instead of non-const versions.
	Copy the location into the breakpoint.
	If LOCATION is NULL, save the breakpoint address as a linespec location
	instead of an address string.
	(create_breakpoint_sal): Change `addr_string' parameter to a struct
	event_location. All uses updated.
	(create_breakpoints_sal): Likewise for local variable `addr_string'.
	(parse_breakpoint_sals): Use locations instead of address strings.
	Remove check for empty linespec with conditional.
	Refactor.
	(decode_static_tracepoint_spec): Make argument const and update
	function.
	(create_breakpoint): Change `arg' to a struct event_location and
	rename.
	Remove `copy_arg' and `addr_start'.
	If EXTRA_STRING is empty, set it to NULL.
	Don't populate `canonical' for pending breakpoints.
	Pass `extra_string' to find_condition_and_thread.
	Clear `extra_string' if `rest' was NULL.
	Do not error with "garbage after location" if setting a dprintf
	breakpoint.
	Copy the location into the breakpoint instead of an address string.
	(break_command_1): Use string_to_event_location and pass this to
	create_breakpoint instead of an address string.
	Check against `arg_cp' for a probe linespec.
	(dprintf_command): Use string_to_event_location and pass this to
	create_breakpoint instead of an address string.
	Throw an exception if no format string was specified.
	(print_recreate_ranged_breakpoint): Use event_location_to_string
	instead of address strings.
	(break_range_command, until_break_command)
	(init_ada_exception_breakpoint): Use locations instead
	of address strings.
	(say_where): Print out extra_string for pending locations.
	(base_breakpoint_dtor): Delete `location' and `location_range_end' of
	the breakpoint.
	(base_breakpoint_create_sals_from_location): Use struct event_location
	instead of address string.
	Remove `addr_start' and `copy_arg' parameters.
	(base_breakpoint_decode_location): Use struct event_location instead of
	address string.
	(bkpt_re_set): Use locations instead of address strings.
	Use event_location_empty_p to check for unset location.
	(bkpt_print_recreate): Use event_location_to_string instead of
	an address string.
	Print out extra_string for pending locations.
	(bkpt_create_sals_from_location, bkpt_decode_location)
 	(bkpt_probe_create_sals_from_location): Use struct event_location
	instead of address string.
	(bkpt_probe_decode_location): Use struct event_location instead of
	address string.
	(tracepoint_print_recreate): Use event_location_to_string to
	recreate the tracepoint.
	(tracepoint_create_sals_from_location, tracepoint_decode_location)
	(tracepoint_probe_create_sals_from_location)
	(tracepoint_probe_decode_location): Use struct event_location
	instead of address string.
	(dprintf_print_recreate): Use event_location_to_string to recreate
	the dprintf.
	(dprintf_re_set): Remove check for valid/missing format string.
	(strace_marker_create_sals_from_location)
	(strace_marker_create_breakpoints_sal, strace_marker_decode_location)
	(update_static_tracepoint): Use struct event_location instead of
	address string.
	(location_to_sals): Likewise.
	Pass `extra_string' to find_condition_and_thread.
	For newly resolved pending breakpoint locations, clear the location's
	string representation.
	Assert that the breakpoint's condition string is NULL when
	condition_not_parsed.
	(breakpoint_re_set_default, create_sals_from_location_default)
	(decode_location_default, trace_command, ftrace_command)
	(strace_command, create_tracepoint_from_upload): Use locations
	instead of address strings.
	* breakpoint.h (struct breakpoint_ops) <create_sals_from_location>:
	Use struct event_location instead of address string.
	Update all uses.
	<decode_location>: Likewise.
	(struct breakpoint) <addr_string>: Change to struct event_location
	and rename `location'.
	<addr_string_range_end>: Change to struct event_location and rename
	`location_range_end'.
	(create_breakpoint): Use struct event_location instead of address
	string.
	* cli/cli-cmds.c: Include location.h.
	(edit_command, list_command): Use locations instead of address strings.
	* elfread.c: Include location.h.
	(elf_gnu_ifunc_resolver_return_stop): Use event_location_to_string.
	* guile/scm-breakpoint.c: Include location.h.
	(bpscm_print_breakpoint_smob): Use event_location_to_string.
	(gdbscm_register_breakpoint): Use locations instead of address
	strings.
	* linespec.c: Include location.h.
	(struct ls_parser) <stream>: Change to const char *.
	(PARSER_STREAM): Update.
	(lionespec_lexer_lex_keyword): According to find_condition_and_thread,
	keywords must be followed by whitespace.
	(canonicalize_linespec): Save a linespec location into `canonical'.
	Save a canonical linespec into `canonical'.
	(parse_linespec): Change `argptr' to const char * and rename `arg'.
	All uses updated.
	Update function description.
	(linespec_parser_new): Initialize `parser'.
	Update initialization of  parsing stream.
	(event_location_to_sals): New function.
	(decode_line_full): Change `argptr' to a struct event_location and
	rename it `location'.
	Use locations instead of address strings.
	Call event_location_to_sals instead of parse_linespec.
	(decode_line_1): Likewise.
	(decode_line_with_current_source, decode_line_with_last_displayed)
	Use locations instead of address strings.
	(decode_objc): Likewise.
	Change `argptr' to const char * and rename `arg'.
	(destroy_linespec_result): Delete the linespec result's location
	instead of freeing the address string.
	* linespec.h (struct linespec_result) <addr_string>: Change to
	struct event_location and rename to ...
	<location>: ... this.
	(decode_line_1, decode_line_full): Change `argptr' to struct
	event_location.  All callers updated.
	* mi/mi-cmd-break.c: Include language.h, location.h, and linespec.h.
	(mi_cmd_break_insert_1): Use locations instead of address strings.
	Throw an error if there was "garbage" at the end of the specified
	linespec.
	* probe.c: Include location.h.
	(parse_probes): Change `argptr' to struct event_location.
	Use event locations instead of address strings.
	* probe.h (parse_probes): Change `argptr' to struct event_location.
	* python/py-breakpoint.c: Include location.h.
	(bppy_get_location): Constify local variable `str'.
	Use event_location_to_string.
	(bppy_init): Use locations instead of address strings.
	* python/py-finishbreakpoint.c: Include location.h.
	(bpfinishpy_init): Remove local variable `addr_str'.
	Use locations instead of address strings.
	* python/python.c: Include location.h.
	(gdbpy_decode_line): Use locations instead of address strings.
	* remote.c: Include location.h.
	(remote_download_tracepoint): Use locations instead of address
	strings.
	* spu-tdep.c: Include location.h.
	(spu_catch_start): Remove local variable `buf'.
	Use locations instead of address strings.
	* tracepoint.c: Include location.h.
	(scope_info): Use locations instead of address strings.
	(encode_source_string): Constify parameter `src'.
	* tracepoint.h (encode_source_string): Likewise.

gdb/testsuite/ChangeLog

	* gdb.base/dprintf-pending.exp: Update dprintf "without format"
	test.
	Add tests for missing ",FMT" and ",".

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