[rfa] allocate_objfile(NULL, 0)

David Carlton
2003-01-10T23:41:23Z

The function allocate_objfile takes some care to return a useful
objfile if its first argument (the bfd) is NULL. But it doesn't set
objfile->name in that case; there is code in GDB that loops over all
the objfiles and examines their names, which breaks in this case.
(See, for example, symbol_add_stub.)

I ran into this problem when imitating the dynamics objfile in
jv-lang.c. So I'm pretty sure that, currently, if anybody tries to
debug Java code that requires that objfile to exist, GDB will seg
fault.

The enclosed patch modifies allocate_objfile to set the name to
"<<anonymous objfile>>" in that situation. It removes the seg fault
that I saw. I ran the test suite on i686-pc-linux-gnu/GCC 3.1/DWARF-2
and saw no new regressions.

Is this patch okay? I don't know offhand who the appropriate
maintainer is.

David Carlton
carlton@math.stanford.edu

2003-01-10 David Carlton <carlton@math.stanford.edu>

* objfiles.c (allocate_objfile): Always set name.

Index: objfiles.c
===================================================================
RCS file: /cvs/src/src/gdb/objfiles.c,v
retrieving revision 1.22
diff -u -p -r1.22 objfiles.c
--- objfiles.c 29 Jul 2002 22:55:26 -0000 1.22
+++ objfiles.c 10 Jan 2003 23:31:56 -0000
@@ -305,6 +305,10 @@ allocate_objfile (bfd *abfd, int flags)
objfile->name, bfd_errmsg (bfd_get_error ()));
}
}
+ else
+ {
+ objfile->name = "<<anonymous objfile>>";
+ }

/* Initialize the section indexes for this objfile, so that we can
later detect if they are used w/o being properly assigned to. */