[COMMITTED V10 0/7] Support for the CTF and BTF debug formats
Jose E. Marchesi
jose.marchesi@oracle.com
Mon Jun 28 17:35:16 GMT 2021
[Changes from V9:
All the patches have been OKed, provided a few things were fixed
before pushing. These points, raised by Richard Biener and Jason
Merrill, have been all addressed as part of the following changes:
- No dwarf2int.h header is introduced anymore in the patch
series. Instead, we are exporting the needed interface in the
existing dwarf2out.h. We intend to do some refactoring of
dwarf2out.[ch] in the near future.
- Make it explicit in the manual that different debug formats can
coexist.
- Add code comment in dwarf2out_source_line.
- Add missing function level comment for btf_debuginfo_p.
- Use uint32_t for a couple of variables that used unsigned int
before.
- Use XNEWVEC instead of xmalloc.
- Adhere to 80 chars line length.
- A few other cosmetic fixes for upstreaming.
Thanks a lot to the reviewers!]
Hi people!
Last year we submitted a first patch series introducing support for
the CTF debugging format in GCC [1]. We got a lot of feedback that
prompted us to change the approach used to generate the debug info,
and this patch series is the result of that.
This series also add support for the BTF debug format, which is needed
by the BPF backend (more on this below.)
This implementation works, but there are several points that need
discussion and agreement with the upstream community, as they impact
the way debugging options work. We are also proposing a way to add
additional debugging formats in the future. See below for more
details.
Finally, a patch makes the BPF GCC backend to use the DWARF debug
hooks in order to make -gbtf available to it.
[1] https://gcc.gnu.org/legacy-ml/gcc-patches/2019-05/msg01297.html
About CTF
=========
CTF is a debugging format designed in order to express C types in a
very compact way. The key is compactness and simplicity. For more
information see:
- CTF specification
http://www.esperi.org.uk/~oranix/ctf/ctf-spec.pdf
- Compact C-Type support in the GNU toolchain (talk + slides)
https://linuxplumbersconf.org/event/4/contributions/396/
- On type de-duplication in CTF (talk + slides)
https://linuxplumbersconf.org/event/7/contributions/725/
About BTF
=========
BTF is a debugging format, similar to CTF, that is used in the Linux
kernel as the debugging format for BPF programs. From the kernel
documentation:
"BTF (BPF Type Format) is the metadata format which encodes the debug
info related to BPF program/map. The name BTF was used initially to
describe data types. The BTF was later extended to include function
info for defined subroutines, and line info for source/line
information."
Supporting BTF in GCC is important because compiled BPF programs
(which GCC supports as a target) require the type information in order
to be loaded and run in diverse kernel versions. This mechanism is
known as CO-RE (compile-once, run-everywhere) and is described in the
"Update of the BPF support in the GNU Toolchain" talk mentioned below.
The BTF is documented in the Linux kernel documentation tree:
- linux/Documentation/bpf/btf.rst
CTF in the GNU Toolchain
========================
During the last year we have been working in adding support for CTF to
several components of the GNU toolchain:
- binutils support is already upstream. It supports linking objects
with CTF information with full type de-duplication.
- GDB support is to be sent upstream very shortly. It makes the
debugger capable to use the CTF information whenever available.
This is useful in cases where DWARF has been stripped out but CTF is
kept.
- GCC support is being discussed and submitted in this series.
Overview of the Implementation
==============================
dwarf2out.c
The enabled debug formats are hooked in dwarf2out_early_finish.
dwarf2int.h
Internal interface that exports a few functions and data types
defined in dwarf2out.c.
dwarf2ctf.c
Code that tranform the internal GCC DWARF DIEs into CTF container
structures. This file uses the dwarf2int.h interface.
ctfc.c
ctfc.h
These two files implement the "CTF container", which is shared
among CTF and BTF, due to the many similarities between both
formats.
ctfout.c
Code that emits assembler with the .ctf section data, from the CTF
container.
btfout.c
Code that emits assembler with the .BTF section data, from the CTF
container.
>From debug hooks to debug formats
=================================
Our first attempt in adding CTF to GCC used the obvious approach of
adding a new set of debug hooks as defined in gcc/debug.h.
During our first interaction with the upstream community we were told
to _not_ use debug hooks, because these are to be obsoleted at some
point. We were suggested to instead hook our handlers (which
processed type TREE nodes producing CTF types from them) somewhere
else. So we did.
However at the time we were also facing the need to support BTF, which
is another type-related debug format needed by the BPF GCC backend.
Hooking here and there doesn't sound like such a good idea when it
comes to support several debug formats.
Therefore we thought about how to make GCC support diverse debugging
formats in a better way. This led to a proposal we tried to discuss
at the GNU Tools Track in LPC2020:
- Update of the BPF support in the GNU Toolchain
https://linuxplumbersconf.org/event/7/contributions/724/
Basically, the current situation in terms of diversity of debugging
formats in GCC can be summarized in the following like:
tree --+ +--> dwarf2out
rtl --+ +--> dbxout
+--> debug_hooks --+--> vmsdbgout
backends --+ +--> xcoffout
lto --+ +--> godump
i.e. each debug format materializes in a set of debug hooks, as in
gcc/debug.h. The installed hooks are then invoked from many different
areas of the compiler including front-end, middle-end, back-end and
also lto. Most of the hooks get TREE objects, from which they are
supposed to extract/infer whatever information they need to express.
This approach has several problems, some of which were raised by you
people when we initially submitted the CTF support:
- The handlers depend on the TREE nodes, so if new TREE nodes are
added to cover new languages, or functionality in existing
languages, all the debug hooks may need to be updated to reflect it.
- This also happens when the contents of existing TREE node types
change or get expanded.
- The semantics encoded in TREE nodes usually are not in the best form
to be used by debug formats. This implies that the several sets of
debug hooks need to do very similar transformations, which again
will have to be adjusted/corrected if the TREE nodes change.
- And more...
In contrast, this is how LLVM supports several debug formats:
+--> DWARF
IR --> class DebugHandlerBase --+--> CodeView
+--> BTF
i.e. LLVM gets debugging information as part of the IR, and then has
debug info backends in the form of instances of DebugHandlerBase,
which process that subset of the IR to produce whatever debug output.
To overcome the problems above, we thought about introducing a new set
of debug hooks, resulting in something like this:
+--> godump
+--> xcoffout
debug_hooks -+--> vmsdbgout
+--> dbxout +--> DWARF
+--> dwarf2out --> n_debug_hooks --+--> BTF
(walk) +--> CTF
... more ...
See how these "new debug hooks" are intended to be called by the DWARF
old debug hooks. In this way:
- The internal DWARF representation becomes the canonical (and only)
IR for debugging information in the compiler. This is similar to
what LLVM uses to implement support for DWARF, BTF and the Microsoft
debug format.
- Debug formats (like CTF, BTF, stabs, etc) are implemented to provide
a very simple API that traverses the DWARF DIE trees available in
dwarf2out.
- The semantics expressed in the DWARF DIEs, which have been already
extracted from the TREE nodes, are free of many internal details and
more suitable to be easily translated into whatever abstractions the
debug formats require.
To avoid misunderstandings, we got to refer to these "new debug hooks"
simply as "debug formats".
In this patch series we are using this later approach in order to
support both CTF and BTF, and we can say we are happy about using the
internal DWARF DIEs as a source instead of TREE nodes: it led to a
more natural implementation, much easier to understand. This sort of
confirms in practice that the approach is sound.
The debug format API
====================
As you can see in the patch series, we hooked CTF in dwarf2out_early_finish
like this:
/* Emit CTF debug info. */
if (ctf_debug_info_level > CTFINFO_LEVEL_NONE && lang_GNU_C ())
{
ctf_debug_init ();
debug_format_do_cu (comp_unit_die ());
for (limbo_die_node *node = limbo_die_list; node; node = node->next)
debug_format_do_cu (node->die);
}
And then the finalization/emission in dwarf2out_finish:
/* Emit CTF/BTF debug info. */
if ((ctf_debug_info_level > CTFINFO_LEVEL_NONE
|| btf_debug_info_level > BTFINFO_LEVEL_NONE) && lang_GNU_C ())
ctf_debug_finalize (filename, btf_debug_info_level > BTFINFO_LEVEL_NONE);
The reason for ctf_debug_finalize to be in dwarf2out_finish is that
backends may (and will, in the case of the BPF backend) add additional
debugging information.
The call to debug_format_do_cu traverses the tree of DIEs passed to it
calling ctf_do_die on them.
This conforms the debug format API:
FOO_debug_init ()
Initialize the debug format FOO.
FOO_debug_finalize (FILENAME)
Possibly write out, cleanup and finalization for debug format FOO.
FOO_do_die (DIE)
Process the given DIE.
Note how the emission of DWARF is interrupted after that point, if no
DWARF was requested by the user.
dwarf2out - dwarf2ctf
=====================
The functions ctf_debug_init, ctf_do_die and ctf_debug_finalize, that
implement the API described above, are all in gcc/dwarf2ctf.c.
Obviously, these routines need access to the dwarf DIE data
structures, and several functions which are defined in dwarf2out.[ch],
many (most?) of which are private to that file: dw_die_ref, get_AT,
etc.
Therefore, in this implementation we exported these functions and data
types in dwarf2out.h.
Command line options for debug formats
======================================
This implementation adds the following command-line options to select the
emission of CTF and BTF:
-gctf[123]
-gbtf
These options mimic the -g[123...] options for DWARF.
Indu Bhagat (7):
dwarf: externalize some DWARF internals for needs of CTF/BTF
dejagnu: modularize gcc-dg-debug-runtest a bit
CTF/BTF debug formats
CTF/BTF testsuites
CTF/BTF documentation
Enable BTF generation in the BPF backend
libiberty: copy over .BTF section when using LTO
gcc/Makefile.in | 8 +
gcc/btfout.c | 1129 +++++++++++++++++
gcc/common.opt | 15 +
gcc/config/bpf/bpf.c | 4 -
gcc/config/bpf/bpf.h | 12 +-
gcc/ctfc.c | 969 ++++++++++++++
gcc/ctfc.h | 436 +++++++
gcc/ctfout.c | 830 ++++++++++++
gcc/doc/invoke.texi | 32 +-
gcc/dwarf2cfi.c | 2 +-
gcc/dwarf2ctf.c | 990 +++++++++++++++
gcc/dwarf2ctf.h | 53 +
gcc/dwarf2out.c | 118 +-
gcc/dwarf2out.h | 44 +
gcc/final.c | 2 +-
gcc/flag-types.h | 21 +-
gcc/flags.h | 9 +
gcc/gengtype.c | 3 +-
gcc/opts.c | 137 +-
gcc/testsuite/gcc.dg/debug/btf/btf-1.c | 6 +
gcc/testsuite/gcc.dg/debug/btf/btf-2.c | 10 +
.../gcc.dg/debug/btf/btf-anonymous-struct-1.c | 23 +
.../gcc.dg/debug/btf/btf-anonymous-union-1.c | 23 +
gcc/testsuite/gcc.dg/debug/btf/btf-array-1.c | 31 +
.../gcc.dg/debug/btf/btf-bitfields-1.c | 34 +
.../gcc.dg/debug/btf/btf-bitfields-2.c | 26 +
.../gcc.dg/debug/btf/btf-bitfields-3.c | 43 +
.../gcc.dg/debug/btf/btf-bitfields-4.c | 23 +
.../gcc.dg/debug/btf/btf-cvr-quals-1.c | 52 +
.../gcc.dg/debug/btf/btf-datasec-1.c | 45 +
gcc/testsuite/gcc.dg/debug/btf/btf-enum-1.c | 30 +
.../gcc.dg/debug/btf/btf-forward-1.c | 24 +
.../gcc.dg/debug/btf/btf-function-1.c | 18 +
.../gcc.dg/debug/btf/btf-function-2.c | 18 +
.../gcc.dg/debug/btf/btf-function-3.c | 22 +
gcc/testsuite/gcc.dg/debug/btf/btf-int-1.c | 44 +
.../gcc.dg/debug/btf/btf-pointers-1.c | 25 +
.../gcc.dg/debug/btf/btf-pointers-2.c | 13 +
gcc/testsuite/gcc.dg/debug/btf/btf-struct-1.c | 22 +
gcc/testsuite/gcc.dg/debug/btf/btf-struct-2.c | 19 +
.../gcc.dg/debug/btf/btf-typedef-1.c | 82 ++
gcc/testsuite/gcc.dg/debug/btf/btf-union-1.c | 16 +
.../gcc.dg/debug/btf/btf-variables-1.c | 33 +
.../gcc.dg/debug/btf/btf-variables-2.c | 27 +
.../gcc.dg/debug/btf/btf-variables-3.c | 36 +
gcc/testsuite/gcc.dg/debug/btf/btf.exp | 41 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-1.c | 6 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-2.c | 10 +
.../gcc.dg/debug/ctf/ctf-anonymous-struct-1.c | 23 +
.../gcc.dg/debug/ctf/ctf-anonymous-union-1.c | 26 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-array-1.c | 31 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-array-2.c | 38 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-array-3.c | 17 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-array-4.c | 13 +
.../gcc.dg/debug/ctf/ctf-attr-mode-1.c | 22 +
.../gcc.dg/debug/ctf/ctf-attr-used-1.c | 22 +
.../gcc.dg/debug/ctf/ctf-bitfields-1.c | 30 +
.../gcc.dg/debug/ctf/ctf-bitfields-2.c | 39 +
.../gcc.dg/debug/ctf/ctf-bitfields-3.c | 16 +
.../gcc.dg/debug/ctf/ctf-bitfields-4.c | 19 +
.../gcc.dg/debug/ctf/ctf-complex-1.c | 21 +
.../gcc.dg/debug/ctf/ctf-cvr-quals-1.c | 65 +
.../gcc.dg/debug/ctf/ctf-cvr-quals-2.c | 30 +
.../gcc.dg/debug/ctf/ctf-cvr-quals-3.c | 25 +
.../gcc.dg/debug/ctf/ctf-cvr-quals-4.c | 23 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-debug-1.c | 7 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-debug-2.c | 7 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-enum-1.c | 21 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-enum-2.c | 27 +
.../gcc.dg/debug/ctf/ctf-file-scope-1.c | 25 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-float-1.c | 16 +
.../gcc.dg/debug/ctf/ctf-forward-1.c | 40 +
.../gcc.dg/debug/ctf/ctf-forward-2.c | 16 +
.../gcc.dg/debug/ctf/ctf-func-index-1.c | 25 +
.../debug/ctf/ctf-function-pointers-1.c | 24 +
.../debug/ctf/ctf-function-pointers-2.c | 22 +
.../debug/ctf/ctf-function-pointers-3.c | 21 +
.../debug/ctf/ctf-function-pointers-4.c | 18 +
.../gcc.dg/debug/ctf/ctf-functions-1.c | 34 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-int-1.c | 17 +
.../gcc.dg/debug/ctf/ctf-objt-index-1.c | 30 +
.../gcc.dg/debug/ctf/ctf-pointers-1.c | 26 +
.../gcc.dg/debug/ctf/ctf-pointers-2.c | 25 +
.../gcc.dg/debug/ctf/ctf-preamble-1.c | 11 +
.../gcc.dg/debug/ctf/ctf-skip-types-1.c | 38 +
.../gcc.dg/debug/ctf/ctf-skip-types-2.c | 17 +
.../gcc.dg/debug/ctf/ctf-skip-types-3.c | 20 +
.../gcc.dg/debug/ctf/ctf-skip-types-4.c | 19 +
.../gcc.dg/debug/ctf/ctf-skip-types-5.c | 19 +
.../gcc.dg/debug/ctf/ctf-skip-types-6.c | 18 +
.../gcc.dg/debug/ctf/ctf-skip-types-7.c | 18 +
.../gcc.dg/debug/ctf/ctf-skip-types-8.c | 27 +
.../gcc.dg/debug/ctf/ctf-str-table-1.c | 26 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-struct-1.c | 25 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-struct-2.c | 32 +
.../gcc.dg/debug/ctf/ctf-struct-array-1.c | 65 +
.../gcc.dg/debug/ctf/ctf-struct-array-2.c | 15 +
.../gcc.dg/debug/ctf/ctf-struct-pointer-1.c | 21 +
.../gcc.dg/debug/ctf/ctf-struct-pointer-2.c | 22 +
.../gcc.dg/debug/ctf/ctf-typedef-1.c | 68 +
.../gcc.dg/debug/ctf/ctf-typedef-2.c | 20 +
.../gcc.dg/debug/ctf/ctf-typedef-3.c | 24 +
.../gcc.dg/debug/ctf/ctf-typedef-struct-1.c | 14 +
.../gcc.dg/debug/ctf/ctf-typedef-struct-2.c | 17 +
.../gcc.dg/debug/ctf/ctf-typedef-struct-3.c | 32 +
gcc/testsuite/gcc.dg/debug/ctf/ctf-union-1.c | 14 +
.../gcc.dg/debug/ctf/ctf-variables-1.c | 25 +
.../gcc.dg/debug/ctf/ctf-variables-2.c | 16 +
gcc/testsuite/gcc.dg/debug/ctf/ctf.exp | 41 +
gcc/testsuite/lib/gcc-dg.exp | 83 +-
gcc/toplev.c | 19 +-
include/btf.h | 196 +++
include/ctf.h | 520 ++++++++
libiberty/simple-object.c | 6 +
114 files changed, 7851 insertions(+), 114 deletions(-)
create mode 100644 gcc/btfout.c
create mode 100644 gcc/ctfc.c
create mode 100644 gcc/ctfc.h
create mode 100644 gcc/ctfout.c
create mode 100644 gcc/dwarf2ctf.c
create mode 100644 gcc/dwarf2ctf.h
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-anonymous-struct-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-anonymous-union-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-array-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-bitfields-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-bitfields-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-bitfields-3.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-bitfields-4.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-cvr-quals-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-datasec-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-enum-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-forward-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-function-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-function-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-function-3.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-int-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-pointers-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-pointers-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-struct-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-struct-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-typedef-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-union-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-variables-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-variables-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-variables-3.c
create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf.exp
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-anonymous-struct-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-anonymous-union-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-array-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-array-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-array-3.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-array-4.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-attr-mode-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-attr-used-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-bitfields-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-bitfields-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-bitfields-3.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-bitfields-4.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-complex-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-cvr-quals-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-cvr-quals-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-cvr-quals-3.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-cvr-quals-4.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-debug-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-debug-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-enum-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-enum-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-file-scope-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-float-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-forward-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-forward-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-func-index-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-function-pointers-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-function-pointers-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-function-pointers-3.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-function-pointers-4.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-functions-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-int-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-objt-index-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-pointers-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-pointers-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-preamble-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-skip-types-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-skip-types-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-skip-types-3.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-skip-types-4.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-skip-types-5.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-skip-types-6.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-skip-types-7.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-skip-types-8.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-str-table-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-struct-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-struct-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-struct-array-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-struct-array-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-struct-pointer-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-struct-pointer-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-typedef-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-typedef-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-typedef-3.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-typedef-struct-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-typedef-struct-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-typedef-struct-3.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-union-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-variables-1.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf-variables-2.c
create mode 100644 gcc/testsuite/gcc.dg/debug/ctf/ctf.exp
create mode 100644 include/btf.h
create mode 100644 include/ctf.h
--
2.25.0.2.g232378479e
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