Minutes, June 12, 2001
010302.1 DW_AT_description attribute
The DW_AT_description attribute provides additional compiler
or language specific descriptions for an object. The intent
is that a consumer (i.e., debugger) would print this as part
of or along with the name of the object.
Adopted, with the second paragraph of the proposed text as non-
010302.2 Byte size and bit offset as object attributes
This proposal would have permitted size and offset attributes on
any object, not just on base types. It would also permit the
dynamic specification of the values for these attributes. The
committee generally felt that permitting size and offset on any
object was too broad an application and it was not clear that
this was needed. Allowing dynamic values for DW_AT_byte_size and
DW_AT_bit_offset was adopted.
Partially adopted: Change 5.1, 5.5, 5.6.1, 5.6.6, (and any other
appropriate sections) to permit expressions as well as constant
values for DW_AT_byte_size and DW_AT_bit_offset
IEEE-ISTO status: Have had further discussions with ISTO about
becomming a forum. Still have not received participant agreement
and will follow up. ISTO will provide web site and other services,
prepare and distribute PR about Dwarf 2 standard, and maintain
participant and/or user list. Distributed updated version of
DWARF2 Operating Procedures document (available at
for additional comment. (Please do read and comment.)
Copyright: We expect to replace the existing copyright page
with copyright information as required by IEEE-ISTO. Will ask
ISTO for copyright info and doc style comments.
Five committee members reviewed and commented on the documents.
Special thanks to Ron Brender for flying from the East Coast
to participate in the editorial review. Thanks to the committee
members who spent the afternoon in this review: Dave Anderson,
Ron Brender, Felix Burton, Michael Eager, and David Weatherford.
A number of editorial changes were noted. Please submit any
other changes, whether major or minor, to the Editor, Ron Brender.
The description and/or semantics of the stack machine used to
evaluate Dwarf expressions is less than completely clear. In
particular, the semantics of DW_OP_piece in 126.96.36.199 and the
semantics of register encodings in 2.5.1 leave much to the
imagination. Pointer to member type (DW_TAG_ptr_to_member) may
not be adequate to describe implementations in adequate detail.
It isn't clear whether we wish to revise these portions of the
document at this time.
Some C++ keywords are not represented in Dwarf. A proposal to
add a TAG for "mutable" and any others which are missing will be