This patch removes the function is_first_nonwhitespace_on_line() in
favor of augmenting the function get_visual_column() to optionally
return the visual column corresponding to the first non-whitespace character
on the line. Existing usage of is_first_nonwhitespace_on_line() can
be trivially replaced by calling get_visual_column() and comparing *out
with *first_nws.
The rationale for this change is that in many cases it is better to use
the visual column of the first non-whitespace character rather than the
visual column of the token. Consider:
if (p) {
foo (1);
} else // GUARD
if (q) // BODY
foo (2);
foo (3); // NEXT
Here, with current heuristics, we do not emit a warning because we
notice that the visual columns of each token line up ("suggesting"
autogenerated code). Yet it is obvious that we should warn here because
it misleadingly looks like the foo (3); statement is guarded by the
else.
If we instead consider the visual column of the first non-whitespace
character on the guard line, the columns will not line up thus we will
emit the warning. This will be done in the next patch.
gcc/c-family/ChangeLog:
* c-indentation.c (get_visual_column): Add parameter first_nws,
use it. Update comment documenting the function.
(is_first_nonwhitespace_on_line): Remove.
(should_warn_for_misleading_indentation): Replace usage of
of is_first_nonwhitespace_on_line with get_visual_column.