to_line blowing up

[Jim Wilson]

Mike Stump wrote:
> Ok, so call me confused, how can:
>   unsigned int to_line = SOURCE_LINE (new_map, new_map->to_line);
> possibly be right?

This looks wrong to me also.  It isn't clear what it is supposed to be, 
because it looks like to_line is used for two different purposes.  In 
one case, it is supposed to be the last line of the file (LC_LEAVE), and 
in the other case it looks like it should be the first line.

> Related to this, should from_line ever be > to_line in the map?

I believe so.  This is used for #line.  So if at line 100 in the input 
file we have a #line that maps to line 1 in a different file, then 
from_line is 100 and to_line is 1.

> If one compiles:
>     int i;
> as a C++ file, and watches what the above code does, one should be able 
> to see it go bad.

This I don't see.  With a trivial input file, from_line and to_line are 
both 1, and nothing bad happens.
-- 
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com