On 07/26/2012 03:11 AM, Mark Wielaard wrote:
Hi,
For the elfutils project (https://fedorahosted.org/elfutils/), which
includes libdw a DWARF consumer library used by programs like perf,
systemtap and the dwarves tools, I wrote up a wiki page with all the
DWARF extensions known to the library:
https://fedorahosted.org/elfutils/wiki/DwarfExtensions
Some comments.
Some of the DW_AT_MIPS extensions were invented in the mid 1990's at SGI but
were never emitted. No SGI compiler emitted them that I am aware of
(I was in the compiler group 1988-2006 and responsible for libdwarf and
for SGI debuggers
among other things). These were given the designation MIPS (instead of
SGI)
because we thought that was just a better thing to do.
DW_TAG_MIPS_loop
DW_AT_MIPS_loop_begin
DW_AT_MIPS_tail_loop_begin
DW_AT_MIPS_epilog_begin
DW_AT_MIPS_loop_unroll_factor
DW_AT_MIPS_software_pipeline_depth
are in the class of attributes that were never implemented at SGI/MIPS.
So I doubt if anyone
ever emitted them. The implied compiler optimizations were done at SGI
in-period, but no
DWARF was emitted describing the optimizations.
The mips_extensions pdf (written by me at SGI
in-period and still distributed with libdwarf and dwarfdump) which
explains
what some of the original MIPS
extensions (only a couple of which were widely used)
meant. (I emailed Mark the pdf in separate email).
Corrections are welcome.
David Anderson
--
I told the doctor I broke my leg in two places. He told me to quit going to
those places. -- Henny Youngman
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