From: "Guillermo E. Martinez" <guillermo.e.martinez@oracle.com>
To: David Faust <david.faust@oracle.com>
Cc: gcc-patches@gcc.gnu.org, Indu Bhagat <indu.bhagat@oracle.com>
Subject: Re: [PATCH] btf: Add support to BTF_KIND_ENUM64 type
Date: Wed, 28 Sep 2022 16:07:33 -0500 [thread overview]
Message-ID: <a8f2ba94-4daa-7a9e-dfa9-1806554e3cfa@oracle.com> (raw)
In-Reply-To: <2debbcea-96b5-f89c-191b-5787bbb2b048@oracle.com>
On 9/28/22 13:45, David Faust wrote:
> Hi Guillermo,
>
Hi David,
> Thanks for the patch. Just a couple of small nits on the changelog
> entries below but otherwise very nice, LGTM.
>
> But, please wait a couple of days before pushing to give Indu time
> to raise any objections about the changes in ctfc/dwarf2ctf.
>
OK. Thanks for your comments!.
> Thanks!
> David
>
> On 8/29/22 14:11, Guillermo E. Martinez via Gcc-patches wrote:
>> Hello GCC team,
>>
>> The following patch update BTF/CTF backend to support
>> BTF_KIND_ENUM64 type.
>>
>> Comments will be welcomed and appreciated!,
>>
>> Kind regards,
>> guillermo
>> --
>>
>> BTF supports 64-bits enumerators with following encoding:
>>
>> struct btf_type:
>> name_off: 0 or offset to a valid C identifier
>> info.kind_flag: 0 for unsigned, 1 for signed
>> info.kind: BTF_KIND_ENUM64
>> info.vlen: number of enum values
>> size: 1/2/4/8
>>
>> The btf_type is followed by info.vlen number of:
>>
>> struct btf_enum64
>> {
>> uint32_t name_off; /* Offset in string section of enumerator name. */
>> uint32_t val_lo32; /* lower 32-bit value for a 64-bit value Enumerator */
>> uint32_t val_hi32; /* high 32-bit value for a 64-bit value Enumerator */
>> };
>>
>> So, a new btf_enum64 structure was added to represent BTF_KIND_ENUM64
>> and a new field in ctf_dtdef to represent specific type's properties, in
>> the particular case for CTF enums it helps to distinguish when its
>> enumerators values are signed or unsigned, later that information is
>> used to encode the BTF enum type.
>>
>> gcc/ChangeLog:
>>
>> * btfout.cc (btf_calc_num_vbytes): Compute enumeration size depending of
>> enumerator type btf_enum{,64}.
>> (btf_asm_type): Update btf_kflag according to enumerators sign,
>> using correct BPF type in BTF_KIND_ENUMi{,64}.
>> (btf_asm_enum_const): New argument to represent the size of
>> the BTF enum type.
>> * ctfc.cc (ctf_add_enum): Use and initialization of flag field to
>> CTF_ENUM_F_NONE.
>> (ctf_add_enumerator): New argument to represent CTF flags,
>> updating the comment and flag vaue according to enumerators
>> sing.
>> * ctfc.h (ctf_dmdef): Update dmd_value to HOST_WIDE_INT to allow
>> use 32/64 bits enumerators.
>> (ctf_dtdef): Add flags to to describe specifyc type's properties.
>
> typo: specific
>
Fixed in v2.
>> * dwarf2ctf.cc (gen_ctf_enumeration_type): Update flags field
>> depending when a signed enumerator value is found.
>> include/btf.h (btf_enum64): Add new definition and new symbolic
>> constant to BTF_KIND_ENUM64 and BTF_KF_ENUM_{UN,}SIGNED.
>
> Missing an * here for include/btf.h
>
Fixed in v2.
>>
>> gcc/testsuite/ChangeLog:
>>
>> gcc.dg/debug/btf/btf-enum-1.c: Update testcase, with correct
>> info.kflags encoding.
>> gcc.dg/debug/btf/btf-enum64-1.c: New testcase.
>
> Likewise for these ChangeLog entries.
>
Fixed in v2.
> You can use contrib/gcc-changelog/git_check_commit.py to check the
> formatting of the entries.
>
Oh. thanks for mention it, really useful.
>> ---
>> gcc/btfout.cc | 24 ++++++++---
>> gcc/ctfc.cc | 14 ++++---
>> gcc/ctfc.h | 9 +++-
>> gcc/dwarf2ctf.cc | 9 +++-
>> gcc/testsuite/gcc.dg/debug/btf/btf-enum-1.c | 2 +-
>> gcc/testsuite/gcc.dg/debug/btf/btf-enum64-1.c | 41 +++++++++++++++++++
>> include/btf.h | 19 +++++++--
>> 7 files changed, 99 insertions(+), 19 deletions(-)
>> create mode 100644 gcc/testsuite/gcc.dg/debug/btf/btf-enum64-1.c
>>
>> diff --git a/gcc/btfout.cc b/gcc/btfout.cc
>> index 997a33fa089..4b11c867c23 100644
>> --- a/gcc/btfout.cc
>>[...]
Regards,
guillermo
next prev parent reply other threads:[~2022-09-28 21:07 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-29 21:11 Guillermo E. Martinez
2022-09-20 19:32 ` Guillermo E. Martinez
2022-09-28 18:45 ` David Faust
2022-09-28 21:07 ` Guillermo E. Martinez [this message]
2022-09-28 21:15 ` [PATCH v2] " Guillermo E. Martinez
2022-09-29 22:35 ` Indu Bhagat
2022-10-03 14:39 ` Guillermo E. Martinez
2022-10-11 18:55 ` Indu Bhagat
2022-10-15 3:45 ` Guillermo E. Martinez
2022-10-15 3:55 ` [PATCH v3] " Guillermo E. Martinez
2022-10-18 21:40 ` Indu Bhagat
2022-10-18 21:48 ` Guillermo E. Martinez
2022-10-20 2:05 ` [PATCH v4] " Guillermo E. Martinez
2022-10-21 9:28 ` Indu Bhagat
2022-10-31 18:26 ` Indu Bhagat
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