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From: John Mellor-Crummey <johnmc@rice.edu>
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Subject: Extension: read inlining info in an NVIDIA extended line map
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Date: Sun, 5 Sep 2021 19:07:45 -0500
Cc: John Mellor-Crummey <johnmc@rice.edu>, Xiaozhu Meng <xm13@rice.edu>
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--Apple-Mail=_EB22CA76-EC65-45E3-8A9F-E0830BF864E9
Content-Transfer-Encoding: quoted-printable
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	charset=utf-8

As of CUDA 11.2, NVIDIA added extensions to the line map section
of CUDA binaries to represent inlined functions. These extensions
include

 - two new fields in a line table row to represent inline=20
   information: context, and functionname,

 - two new DWARF extended opcodes: DW_LNE_inlined_call,=20
   DW_LNE_set_function_name,

 - an additional word in the line table header that indicates=20
   the offset in the .debug_str function where the function=20
   names for this line table begin, and

 - two new functions in the libdw API: dwarf_linecontext and=20
   dwarf_linefunctionname, which return the new line table fields.

A line table row for an inlined function contains a non-zero
"context" value. The =E2=80=9Ccontext=E2=80=9D field indicates the index =
of the
line table row that serves as the call site for an inlined
context.

The "functionname" field in a line table row is only meaningful
if the "context" field of the row is non-zero. A meaningful
"functionname" field contains an index into the .debug_str
section relative to the base offset established in the line table
header; the position in the .debug_str section indicates the name
of the inlined function.

These extensions resemble the proposed DWARF extensions
(http://dwarfstd.org/ShowIssue.php?issue=3D140906.1) by Cary
Coutant, but are not identical.

This patch adds integrates support for handling NVIDIA's extended
line maps into elfutil's libdw library and the readelf command
line utility.

Since this support is a non-standard extension to DWARF, all code
that implements the extensions is implemented between markers =20
/* Begin NVIDIA_LINEMAP_INLINING_EXTENSIONS */ and=20
/* End NVIDIA_LINEMAP_INLINING_EXTENSIONS */.

The definition below

 #define NVIDIA_LINEMAP_INLINING_EXTENSIONS 1

is added to elfutils/version.h, which enables a client of elfutils=20
to test whether the NVIDIA line map extensions are present.=20

Note: The support for NVIDIA extended line maps adds two integer
fields (context and functionname) to struct Dwarf_Line_s, which
makes the structure about 30% larger.

The patch includes a binary testfile_nvidia_linemap.bz2 that
contains an NVIDIA extended linemap along with two tests that
read the line map.

 - A test script run-nvidia-extended-linemap-readelf.sh=20
   checks the output of readelf on the new test binary to=20
   validate its dump of the line op codes containing context=20
   and functionname entries.

 - A test program tests/nvidia_extended_linemap_libdw.c reads=20
   the extended line map with dwarf_next_lines and dumps the=20
   context and functionname fields of the line map where they=20
   are relevant, i.e. the value of context is non-zero. A test=20
   script run-nvidia-extended-linemap-libdw.sh runs this test=20
   and validates its output.

A patch with the new functionality described above is attached.
--
John Mellor-Crummey		Professor
Dept of Computer Science	Rice University
email: johnmc@rice.edu		phone: 713-348-5179


--Apple-Mail=_EB22CA76-EC65-45E3-8A9F-E0830BF864E9
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NVIDIA_LINEMAP_INLINING_EXTENSIONS=20*/=0A+/*=20NVIDIA=20extension:=20=
Return=20inline=20context=20in=20this=20record.=20A=20non-zero=20context=0A=
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NVIDIA_LINEMAP_INLINING_EXTENSIONS=20*/=0A+=0A=20/*=20Return=20file=20=
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discriminator:24;=0A+/*=20Begin=20NVIDIA_LINEMAP_INLINING_EXTENSIONS=20=
*/=0A+=20=20unsigned=20int=20context;=0A+=20=20unsigned=20int=20=
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};=0A=20=0A=20struct=20Dwarf_Lines_s=0Adiff=20--git=20a/src/readelf.c=20=
b/src/readelf.c=0Aindex=208191bde2..050f2592=20100644=0A---=20=
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=20break;=0A+/*=20End=20NVIDIA_LINEMAP_INLINING_EXTENSIONS=20*/=0A+=0A=20=
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100644=0A---=20a/tests/Makefile.am=0A+++=20b/tests/Makefile.am=0A@@=20=
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newfile=20saridx=20scnnames=20sectiondump=20\=0A=20=09=09=20=20=
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nvidia_extended_linemap_libdw=20\=0A=20=09=09=20=20$(asm_TESTS)=0A=20=0A=20=
asm_TESTS=20=3D=20asm-tst1=20asm-tst2=20asm-tst3=20asm-tst4=20asm-tst5=20=
\=0A@@=20-189,6=20+190,7=20@@=20TESTS=20=3D=20run-arextract.sh=20=
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read_unaligned=20\=0A=20=09msg_tst=20system-elf-libelf-test=20\=0A=20=09=
$(asm_TESTS)=20run-disasm-bpf.sh=20run-low_high_pc-dw-form-indirect.sh=20=
\=0A+=09run-nvidia-extended-linemap-libdw.sh=20=
run-nvidia-extended-linemap-readelf.sh=20\=0A=20=09=
run-readelf-dw-form-indirect.sh=20run-strip-largealign.sh=0A=20=0A=20if=20=
!BIARCH=0A@@=20-725,6=20+727,7=20@@=20dwelf_elf_e_machine_string_LDADD=20=
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$(libdw)=0A=20leb128_LDADD=20=3D=20$(libelf)=20$(libdw)=0A=20=
read_unaligned_LDADD=20=3D=20$(libelf)=20$(libdw)=0A=
+nvidia_extended_linemap_libdw_LDADD=20=3D=20$(libelf)=20$(libdw)=0A=20=0A=
=20#=20We=20want=20to=20test=20the=20libelf=20header=20against=20the=20=
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a/tests/nvidia_extended_linemap_libdw.c=20=
b/tests/nvidia_extended_linemap_libdw.c=0Anew=20file=20mode=20100644=0A=
index=2000000000..9f1e5efd=0A---=20/dev/null=0A+++=20=
b/tests/nvidia_extended_linemap_libdw.c=0A@@=20-0,0=20+1,153=20@@=0A+/*=20=
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=20Copyright=20(C)=202002,=202004,=202018=20Red=20Hat,=20Inc.=0A+=20=20=20=
This=20file=20is=20part=20of=20elfutils.=0A+=0A+=20=20=20This=20file=20=
is=20free=20software;=20you=20can=20redistribute=20it=20and/or=20modify=0A=
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Foundation;=20either=20version=203=20of=20the=20License,=20or=0A+=20=20=20=
(at=20your=20option)=20any=20later=20version.=0A+=0A+=20=20=20elfutils=20=
is=20distributed=20in=20the=20hope=20that=20it=20will=20be=20useful,=20=
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implied=20warranty=20of=0A+=20=20=20MERCHANTABILITY=20or=20FITNESS=20FOR=20=
A=20PARTICULAR=20PURPOSE.=20=20See=20the=0A+=20=20=20GNU=20General=20=
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have=20received=20a=20copy=20of=20the=20GNU=20General=20Public=20License=0A=
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