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[linemap PATCH] Constify lookup

Browse Source 
https://gcc.gnu.org/ml/gcc-patches/2019-10/msg01080.html
looking up a line map takes a non-constant line_maps object, which is confusing.
This makes the caching fields mutable, so permits a constant object, as one might expect for a lookup.

	* include/line-map.h (struct maps_info_ordinary): Make cache
	mutable.
	(struct maps_info_macro): Likewise.
	(LINEMAPS_CACHE): Remove non-ref accessor. Constify ref accessor.
	(LINEMAPS_ORDINARY_CACHE, LINEMAPS_MACRO_CACHE): Likewise.
	(LINEMAPS_ORDINARY_MAP_AT, LINEMAPS_MACRO_MAP_AT): Use
	LINEMAPS_USED and LINEMAPS_MAP_AT.
	(linemap_lookup): Constify line_map arg.
	linemap.c (linemap_ordinary_map_lookup, linemap_macro_map_lookup):
	Constify line_map arg.

From-SVN: r276994
This commit is contained in:
Nathan Sidwell 2019-10-15 12:03:04 +00:00 committed by Nathan Sidwell
parent d8955dc0f4
commit 9158f0ba97
3 changed files with 32 additions and 46 deletions
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13
libcpp/ChangeLog
View File

@ -1,3 +1,16 @@
2019-10-15 Nathan Sidwell <nathan@acm.org>
* include/line-map.h (struct maps_info_ordinary): Make cache
mutable.
(struct maps_info_macro): Likewise.
(LINEMAPS_CACHE): Remove non-ref accessor. Constify ref accessor.
(LINEMAPS_ORDINARY_CACHE, LINEMAPS_MACRO_CACHE): Likewise.
(LINEMAPS_ORDINARY_MAP_AT, LINEMAPS_MACRO_MAP_AT): Use
LINEMAPS_USED and LINEMAPS_MAP_AT.
(linemap_lookup): Constify line_map arg.
linemap.c (linemap_ordinary_map_lookup, linemap_macro_map_lookup):
Constify line_map arg.
2019-10-11 Joseph Myers <joseph@codesourcery.com>
* include/cpplib.h (struct cpp_options): Add dfp_constants and

53
libcpp/include/line-map.h
View File

@ -724,7 +724,7 @@ struct GTY(()) maps_info_ordinary {
or equal to ALLOCATED. */
unsigned int used;
unsigned int cache;
mutable unsigned int cache;
};
struct GTY(()) maps_info_macro {
@ -739,7 +739,7 @@ struct GTY(()) maps_info_macro {
or equal to ALLOCATED. */
unsigned int used;
unsigned int cache;
mutable unsigned int cache;
};
/* Data structure to associate a source_range together with an arbitrary
@ -865,19 +865,8 @@ LINEMAPS_USED (line_maps *set, bool map_kind)
/* Returns the index of the last map that was looked up with
linemap_lookup. MAP_KIND shall be TRUE if we are interested in
macro maps, FALSE otherwise. */
inline unsigned int
LINEMAPS_CACHE (const line_maps *set, bool map_kind)
{
if (map_kind)
return set->info_macro.cache;
else
return set->info_ordinary.cache;
}
/* As above, but by reference (e.g. as an lvalue). */
inline unsigned int &
LINEMAPS_CACHE (line_maps *set, bool map_kind)
LINEMAPS_CACHE (const line_maps *set, bool map_kind)
{
if (map_kind)
return set->info_macro.cache;
@ -927,9 +916,9 @@ LINEMAPS_ORDINARY_MAPS (const line_maps *set)
inline line_map_ordinary *
LINEMAPS_ORDINARY_MAP_AT (const line_maps *set, int index)
{
linemap_assert (index >= 0);
linemap_assert ((unsigned int)index < set->info_ordinary.used);
return &set->info_ordinary.maps[index];
linemap_assert (index >= 0
&& (unsigned int)index < LINEMAPS_USED (set, false));
return (line_map_ordinary *)LINEMAPS_MAP_AT (set, false, index);
}
/* Return the number of ordinary maps allocated in the line table
@ -949,16 +938,8 @@ LINEMAPS_ORDINARY_USED (const line_maps *set)
/* Return the index of the last ordinary map that was looked up with
linemap_lookup. */
inline unsigned int
LINEMAPS_ORDINARY_CACHE (const line_maps *set)
{
return LINEMAPS_CACHE (set, false);
}
/* As above, but by reference (e.g. as an lvalue). */
inline unsigned int &
LINEMAPS_ORDINARY_CACHE (line_maps *set)
LINEMAPS_ORDINARY_CACHE (const line_maps *set)
{
return LINEMAPS_CACHE (set, false);
}
@ -991,9 +972,9 @@ LINEMAPS_MACRO_MAPS (const line_maps *set)
inline line_map_macro *
LINEMAPS_MACRO_MAP_AT (const line_maps *set, int index)
{
linemap_assert (index >= 0);
linemap_assert ((unsigned int)index < set->info_macro.used);
return &set->info_macro.maps[index];
linemap_assert (index >= 0
&& (unsigned int)index < LINEMAPS_USED (set, true));
return (line_map_macro *)LINEMAPS_MAP_AT (set, true, index);
}
/* Returns the number of macro maps that were allocated in the line
@ -1011,18 +992,10 @@ LINEMAPS_MACRO_USED (const line_maps *set)
return LINEMAPS_USED (set, true);
}
/* Returns the index of the last macro map looked up with
/* Return the index of the last macro map that was looked up with
linemap_lookup. */
inline unsigned int
LINEMAPS_MACRO_CACHE (const line_maps *set)
{
return LINEMAPS_CACHE (set, true);
}
/* As above, but by reference (e.g. as an lvalue). */
inline unsigned int &
LINEMAPS_MACRO_CACHE (line_maps *set)
LINEMAPS_MACRO_CACHE (const line_maps *set)
{
return LINEMAPS_CACHE (set, true);
}
@ -1130,7 +1103,7 @@ extern const line_map *linemap_add
binary search. If no line map have been allocated yet, this
function returns NULL. */
extern const line_map *linemap_lookup
(class line_maps *, location_t);
(const line_maps *, location_t);
/* Returns TRUE if the line table set tracks token locations across
macro expansion, FALSE otherwise. */

12
libcpp/line-map.c
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@ -27,9 +27,9 @@ along with this program; see the file COPYING3. If not see
#include "hashtab.h"
static void trace_include (const line_maps *, const line_map_ordinary *);
static const line_map_ordinary * linemap_ordinary_map_lookup (line_maps *,
static const line_map_ordinary * linemap_ordinary_map_lookup (const line_maps *,
location_t);
static const line_map_macro* linemap_macro_map_lookup (line_maps *,
static const line_map_macro* linemap_macro_map_lookup (const line_maps *,
location_t);
static location_t linemap_macro_map_loc_to_def_point
(const line_map_macro *, location_t);
@ -937,7 +937,7 @@ linemap_position_for_loc_and_offset (line_maps *set,
ordinary or a macro map), returns that map. */
const struct line_map*
linemap_lookup (line_maps *set, location_t line)
linemap_lookup (const line_maps *set, location_t line)
{
if (IS_ADHOC_LOC (line))
line = get_location_from_adhoc_loc (set, line);
@ -952,7 +952,7 @@ linemap_lookup (line_maps *set, location_t line)
binary search. */
static const line_map_ordinary *
linemap_ordinary_map_lookup (line_maps *set, location_t line)
linemap_ordinary_map_lookup (const line_maps *set, location_t line)
{
unsigned int md, mn, mx;
const line_map_ordinary *cached, *result;
@ -965,7 +965,7 @@ linemap_ordinary_map_lookup (line_maps *set, location_t line)
mn = LINEMAPS_ORDINARY_CACHE (set);
mx = LINEMAPS_ORDINARY_USED (set);
cached = LINEMAPS_ORDINARY_MAP_AT (set, mn);
/* We should get a segfault if no line_maps have been added yet. */
if (line >= MAP_START_LOCATION (cached))
@ -1000,7 +1000,7 @@ linemap_ordinary_map_lookup (line_maps *set, location_t line)
binary search. */
static const line_map_macro *
linemap_macro_map_lookup (line_maps *set, location_t line)
linemap_macro_map_lookup (const line_maps *set, location_t line)
{
unsigned int md, mn, mx;
const struct line_map_macro *cached, *result;