[PATCH] (v2) read inlining info in an NVIDIA extended line map
Wed Nov 10 10:16:31 GMT 2021
On Thu, Nov 04, 2021 at 04:41:58PM -0500, John Mellor-Crummey via Elfutils-devel wrote:
> Here I describe just the improvements to that patch that address Mark’s concerns:
> (1) all of the code for handling NVIDIA DWARF extensions is always
> available; there is no special configuration switch needed.
> (2) all changes are bracketed by comments that mark them NVIDIA
> (3) the DWARF extended opcodes have been renamed with names that
> include NVIDIA in them
> (4) the two new API functions to surface the new information have
> been improved to separate the interface result from the internal
> representation (at Mark’s request)
> (4a) the API for extracting the name of an inlined function in a
> DWARF line now returns a const char * instead of a string
> table index
> (4b) the API for extracting an inline “context” now returns a
> pointer to a DWARF line where the code is inlined rather
> than returning an unsigned int (an index into the line table
> that one could use to compute the pointer)
> (5) there are test cases for readelf and libdw that use a binary
> generated by NVIDIA’s compiler. the test cases include information
> about how the binary was generated
This is really nice. I did make a few tweaks:
- Added your original overview as commit message because it contains
all the relevant context and pointers to more information.
- Added ChangeLog and NEWS entries, mainly for my own review.
- I removed the bracketed comments, I think they cluttered the code
and made it seem like we wanted to remove it or disable at some
point. I think it should just be considered part of the normal code
- I removed the NVIDIA_LINEMAP_INLINING_EXTENSIONS define from
version.h. If people want they can have a configure check for the
new dwarf_linecontext or dwarf_linefunctionname functions or the
DW_LNE_NVIDIA_inlined_call or DW_LNE_NVIDIA_set_function_name
- I made dwarf_linefunctionname always return NULL on error (not
the magic string "???", which is still used in readelf).
- Changed the header check to be exactly 4 bytes, so we are sure to be
able to read the str offset completely (if it is smaller or larger
we cannot handle it).
- The new dwarf_linecontext and dwarf_linefunctionname get their own
new ELFUTILS_0.186 section in libdw.map because they are introduced
with verion 0.186.
- The new run-nvidia-extended-linemap-libdw.sh and
run-nvidia-extended-linemap-readelf.sh sripts and
testfile_nvidia_linemap.bz2 testfile were added to EXTRA_DIST so
they show up in a dist tarball.
Patch as committed attached. Hope you don't mind the cleanups.
We still want to reduce the size of the Dwarf_Line_s and struct
line_state (independent of these extensions). I opened a new bug for
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