March 29, 2006 The March 27, 2006 version accomodates DWARF3. Some people have been using the library without altering dwarf.h, libdwarf.h to accomodate large numbers of registers. This exposed a bug (an off-by-one error) but also makes it clear additional documentation is needed. So in libdwarf large new comments near 'TARGET DEPENDENCY' attempt to explain better. Oct 03, 2005 The July version had an incompatible interface: old dealloc code did not always work right. The incompatibility is now fixed and the new features remain. July 15, 2005 New optional alloc-check code optionally checks all allocated memory is freed (malloc_check.h malloc_check.c) Various new dealloc routines written as the previous approach of letting client code do detailed dealloc turned out not to dealloc all memory. To get the new checking you must manually change a line in malloc_check.h and rebuild libdwarf. Mar 31, 2005 Documented the libexc.so/.debug_funcnames dependency and the 64bit-offset DWARF extension in mips_extentions.{mm,ps}. Mar 21, 2005 gcc 3.3 and 3.4 .eh_frame 'z' augmentations are not handled correctly, so libdwarf gives an error when attempting to print such. gcc 2 'eh' augmentation is simpler and prints correctly. (.eh_frame is a GNU section, not DWARF2/3, and what is recorded in .eh_frame is not specified by DWARF2/3, though .eh_frame does resemble DWARF2/3 .debug_frame). 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.