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* [gcc r9-9346] Fix thinko in libcpp preparation patch for modules
@ 2021-04-13 12:04 Eric Botcazou
0 siblings, 0 replies; only message in thread
From: Eric Botcazou @ 2021-04-13 12:04 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:e268afb4a89d172244ef46d999be97b1dd8343d8
commit r9-9346-ge268afb4a89d172244ef46d999be97b1dd8343d8
Author: Eric Botcazou <ebotcazou@adacore.com>
Date: Tue Apr 13 11:57:55 2021 +0200
Fix thinko in libcpp preparation patch for modules
The problem is that the new IS_MACRO_LOC macro:
inline bool
IS_MACRO_LOC (location_t loc)
{
return !IS_ORDINARY_LOC (loc) && !IS_ADHOC_LOC (loc);
}
is not fully correct since the position of the macro lines is not fixed:
/* Returns the lowest location [of a token resulting from macro
expansion] encoded in this line table. */
inline location_t
LINEMAPS_MACRO_LOWEST_LOCATION (const line_maps *set)
{
return LINEMAPS_MACRO_USED (set)
? MAP_START_LOCATION (LINEMAPS_LAST_MACRO_MAP (set))
: MAX_LOCATION_T + 1;
}
In Ada, LINEMAPS_MACRO_USED is false so LINEMAPS_MACRO_LOWEST_LOCATION is
MAX_LOCATION_T + 1, but IS_MACRO_LOC nevertheless returns true for anything
in the range [LINE_MAP_MAX_LOCATION; MAX_LOCATION_T], thus yielding an ICE
in linemap_macro_map_lookup for very large files.
libcpp/
* include/line-map.h (IS_MACRO_LOC): Delete.
* line-map.c (linemap_location_from_macro_expansion_p): Test
LINEMAPS_MACRO_LOWEST_LOCATION of the linemap.
Diff:
---
libcpp/include/line-map.h | 10 +++-------
libcpp/line-map.c | 2 +-
2 files changed, 4 insertions(+), 8 deletions(-)
diff --git a/libcpp/include/line-map.h b/libcpp/include/line-map.h
index 6c77c288855..51db65e5247 100644
--- a/libcpp/include/line-map.h
+++ b/libcpp/include/line-map.h
@@ -561,7 +561,7 @@ struct GTY((tag ("2"))) line_map_macro : public line_map {
#define linemap_assert_fails(EXPR) (! (EXPR))
#endif
-/* Get whether location LOC is an ad-hoc, ordinary or macro location. */
+/* Get whether location LOC is an ordinary location. */
inline bool
IS_ORDINARY_LOC (location_t loc)
@@ -569,18 +569,14 @@ IS_ORDINARY_LOC (location_t loc)
return loc < LINE_MAP_MAX_LOCATION;
}
+/* Get whether location LOC is an ad-hoc location. */
+
inline bool
IS_ADHOC_LOC (location_t loc)
{
return loc > MAX_LOCATION_T;
}
-inline bool
-IS_MACRO_LOC (location_t loc)
-{
- return !IS_ORDINARY_LOC (loc) && !IS_ADHOC_LOC (loc);
-}
-
/* Categorize line map kinds. */
inline bool
diff --git a/libcpp/line-map.c b/libcpp/line-map.c
index b73f5067c24..6b5c36524ee 100644
--- a/libcpp/line-map.c
+++ b/libcpp/line-map.c
@@ -1243,7 +1243,7 @@ linemap_location_from_macro_expansion_p (const struct line_maps *set,
location = set->location_adhoc_data_map.data[location
& MAX_LOCATION_T].locus;
- return IS_MACRO_LOC (location);
+ return location >= LINEMAPS_MACRO_LOWEST_LOCATION (set);
}
/* Given two virtual locations *LOC0 and *LOC1, return the first
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