[Bug c/69985] [6 Regression] ICE: in linemap_position_for_loc_and_offset, at libcpp/line-map.c:924

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69985

--- Comment #19 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Manuel López-Ibáñez from comment #18)
> I don't really understand why this is the case: we seem to waste a lot of
> location numbers that do not point to anything. If there is a way to tell
> which map should encode a particular line,column, then we simply should use
> that map if there are free locations left to do so.

Perhaps by trying first

linemap_position_for_line_and_column (set, map, line, column+offset)

if that returns a location >= map[1].start_location, then if (line <
ORDINARY_MAP_STARTING_LINE_NUMBER (map+1)), try again with map++, until either
we run out of maps or the next map encodes a higher line, and in those cases we
give up.