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Oct 28, 2004
Updated contact address in copyright: SGI moved 1/4 mile
in 2003 to a new address: 1500 Crittenden Lane.
Documented additional vendor extensions.
Oct 27, 2004
Added known vendor extensions to dwarf2/3 to dwarf.h
HP, GNU, PGI and UPC extensions are now recorded.
Recorded vendor extensions from Concurrent.
Feb 3, 2004
If 'Dwarf_Word' is 64 bits, two macros reading leb numbers
fail to initialize upper bits of the values read.
First noticed with bogus line numbers printing from dwarfdump.
Now we use already-existing functions, avoiding the problem.
Oct 02, 2003
Support .debug_loc section fully.
Sept 29, 2003
Support DW_FORM_indirect properly.
Supports loclists in part (but not multiple loclist entries yet).
Support 'padding bytes' at end of .debug_arange and
.debug_pubnames and .debug_pubtypes per CU
(recent dwarf committee email made it clear this is appropriate).
May 23, 2002
Libdwarf now asks for sections only when they are
used, so that unneeded sections aren't loaded.
Support for using SGI's ELF library as an alternative to
using AT&T libelf-style has been added (the SGI ELF
library is presently only available internally to SGI).
Jan 10, 2002
Fixed memory leak in dwarf_finish().
Aug 21, 2001
If one called dwarf_add_file_decl()
or dwarf_add_directory_decl() but never added a line,
.debug_line was not produced. This was a mistake,
as if any file or directory was provided .debug_line
should be produced. Now it is produced.
June 14, 2001
Given a cu header offset, it was not easy to derive the
CU header DIE offset. Created the new
function dwarf_get_cu_die_offset_given_cu_header_offset()
do get the CU header DIE offset.
Added the function dwarf_get_arange_cu_header_offset()
so the cu header offset could be retrieved from .debug_aranges
information.
June 07, 2001
Major bug in dwarf_leb.c decoding large integers
(Dwarf_Signed 64 bit where library is compiled in ILP32)
found and fixed.
May 21, 2001
Some small fixes have been found by various folks,
so it seems time to prepare a new source release.
See ChangeLog for details.
April 15, 2000
The libdwarf copyright has changed to
version 2.1 of the GNU Lesser General Public License.
Anyone holding a version of libdwarf that was published
before this new copyright is allowed to use
the copyright published in that earlier libdwarf source
on the earlier source
or to use
this new copyright on the earlier source,
at their option.
December 08, 1999
The dwarf committee has adopted the offset-extension
proposal. This allows compatibly emitting
dwarf with 64bit offsets.
The dwarf reader now automatically figures out which is in use.
The dwarf writer configures itself at the time the
writer initialization routine is called, though
the writer is restricted, at libdwarf
compile time, to one of
mips/sgi pure 32/pure 64 offsets/pointers.
32bit offsets only (per dwarf 2.0.0 and cygnus)
32bit offsets with extension to 64bit offsets
allowed (the offset-extension newly passed).
In addition, a great deal of duplicate code
for the sgi .debug_weaknames, .debug_funcnames,
.debug_varnames and .debug_typenames sections has
been removed: a single set of functions does the real work now.
Sept 29, 1999
Just found out that cygnus is, on 64bit targets, generating
32bit offsets (as elf32 has, for example) with 64 bit
pointers (in references to text and data).
Whereas sgi has always generated 64bit dwarf with
64 bit offsets (as in elf64) and 64bit pointers for
64bit pointer objects.
I'll call the sgi approach 64-bit and the cygnus approach
32bit-offsets.
Cygnus is following the DWARF2 spec as written, so they are
right in doing only 32bit-offsets.
Folks at sgi (including me) think that, as for elf64,
the offsets in dwarf for 64bit pointer-apps should be
64 bits. We think it is only a matter of time
before we really *need* 64bit offsets and when that happens
it will be on an important app. Disk space is cheap,
so lets just go 64 bit on 64bit apps (such as ia64 apps)
to avoid a future problem.
I(davea@sgi.com) think the 'pointer-size' references in the dwarf
spec were really written for 64-bit pointer apps.
I don't recall serious consideration of 64bit pointer
apps in the committee deliberations (I did miss
a couple of meetings) and think 64bit offsets
are consistent with dwarf2, even though the speci
was not written for such. We think true full 64 bit
dwarf2 is the right way to go (the spec changes
are obvious: file and section offsets become 64bit
with 64bit pointer objects.
MIPS/SGI is definitely 64-bit offsets for 64 bit objects,
cygnus is definitely 32bit-offsets for earlier 64bit pointer
environments.
At any rate, now the dwarf reader allows and accomodates
both and the dwarf producer also accomodates both.
Some tweaking of the pro_init.c or dwarf_init_finish.c
files may be necessary in future: no other changes should
be needed to accomodate the two 64bit approaches, as
the library (and dwarfdump) now deal with both forms.
August 20, 1999
Added some #ifndef/#define to pro_util.h to let libdwarf build
on more hosts. (since those hosts don't need the producer
code, AFAIK, zero values suffice for missing #defines.)
July 21, 1999
Now reader transparently reads either-endianness data
from an either-endianness object.
Updated dwarf.h and libdwarf.h to recognize
GNU egcs dwarf extensions and to print the egcs eh_frame
section.
June 10, 1999
gnu configure version of libdwarf made available for the
first time.
Still allows only same-endian-as-host in objects.
August, 1994
libdwarf source made available for ftp on sgigate.sgi.com
/ftp/pub
June, 1994
Consumer interface changed completely, following
"Candy Machine Interfaces" chapter from
"Writing Solid Code" by Steve Maguire (Microsoft Press).
April, 1993
Initial version of libdwarf for dwarf version 2
written at sgi.
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