

-------------------------------------------------------------
April 14, 2000  davea@sgi.com
Corrected minor bugs in production of 32bit dwarf with
64 bit pointers.  Fixed omissions in legal
DIE children of a DIE.  Make small changes in
description of regster output in frame information
access.

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Mar 7, 2000 davea@sgi.com
Corrected line table reading so it will handle
reading an object with a diffent number of standard
op codes than at libdwarf compile time.
This was possible all along, but libdwarf did
not do it right.

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Dec 8, 1999  davea@sgi.com
Changed nearly all files.
Adding the capability to read and produce
the new, accepted by committee, but not
released-publically 64bit extension proposal
dwarf data.
This allows dwarf compilation units
with 64bit section offsets and 32bit
sections offsets to be mixed. 
So that offsets can grow very large with
64-bit pointer applications (though 64bit pointers
and 64bit offsets are not the same notion).

In addition, removed all the contents (or nearly all)
of the dwarf_funcs.c dwarf_weaks.c dwarf_vars.c,
and dwarf_types.c, as the data format is identical
to dwarf globals (pubnames) and there is no need
to duplicate all that code.

All these sections whose contents were gutted are things that
are formatted exactly like pubnames, and all are sgi
extensions.  Now the implementation uses pubnames code
(dwarf_global.c) to do the work for all the pubnames-like
sections.

The (minor, IMO) difference is that in case of an incorrect
dwarf file (leading to libdwarf being unable to process
something in one of the sgi-specific pubnames-like sections)
the dwarf error string may reference pubnames when weaks,
static functions, static variables, or global typenames are
actually the problem.  This is fixable, however the price would
appear to be that even globals would need to call a helper
function (to pass in the correct error return).  Right now the
dwarf_weaks.c calls the dwarf_global.c function, for example,
with no extra arguments indicating the true section involved.
(Other approaches keeping the original error codes exist.
Producing the code uniquely via macros seems unappealing.
Inline functions would be ok though.  This version does not
inline the functions we are talking about, such as
dwarf_global_name_offsets() when called from
dwarf_type_name_offsets().)

Since these extra sections are SGI only and only really used by
SGI's workshop product, and the performance hit is small, the
extra function calls in reading each seem acceptable.


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Sep 29,1999 davea@sgi.com
Changed many files, so that it is easy to switch
from 32bit-offset-only (like cygnus
and dwarf2 v 2.0.0)  to sgi/mips 64 bit dwarf.
See NEWS for more info on 32bit-offset.


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Since Oct 95 and before May, 1996

Added the function dwarf_get_cie_of_fde() which makes it possible
to remember a single fde/cie set out of a block usefully.

Enhanced doc of dwarf_bitoffset()

Added new function dwarf_global_formref() so all reference
forms can be retrieved.

Fixed bug in retrieving array bounds: was failing to sign extend
formsdata.

Added function dwarf_get_fde_info_for_all_regs(), which makes
retrieval of the complete set of registers (as needed by
debuggers and exception handlers) effectively N times faster
than getting them one a time where N is the number of registers.

Added support for exception table handling (really just support
for a reference to an exception table for c++ exceptions).

Fixed a bug where useless extra space (several megabytes)
were malloc'ed for the abbreviations table by the libdwarf
consumer code.

davea@sgi.com
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