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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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