Hi,

This patch provides better error detection when processing certain DWARF
location blocks. Basically an error is given in these cases when the
attribute's form is not a DW_AT_block*.

Again, this patch does not support in read_tag_string_type() the
DW_AT_string_length attribute which is currently being misused by GCC
(it uses it to hold the length, rather than the location to the length)
and GDB supports this incorrect form.

2002-07-11 Petr Sorfa (petrs@caldera.com)

        *  dwarf2read.c (dwarf2_invalid_attrib_class): New
           complaint for invalid attribute class or form.
           (read_func_scope): DW_AT_frame_base
           better handling of DW_AT_block*.
           (dwarf2_add_member_fn): DW_AT_vtable_elem_location
           better handling of DW_AT_block*.
           (read_common_block): DW_AT_location
           better handling of DW_AT_block*.
           (read_partial_die): DW_AT_location better handling
           of DW_AT_block*.
           (new_symbol): DW_AT_external better handling of
           DW_AT_block*. Proper initialization of variable
           "addr".