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From: "jemarch at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/112656] New: btf: function prototypes generated with name
Date: Tue, 21 Nov 2023 19:25:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112656

            Bug ID: 112656
           Summary: btf: function prototypes generated with name
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jemarch at gcc dot gnu.org
  Target Milestone: ---

BTF suports both BTF_KIND_FUNC and BTF_KIND_FUNC_PROTO tags.  FUNC entries =
link
to their corresponding PROTO via type_id.  PROTO entries must have no names,
i.e. name_off shall be 0.

GCC seems to be generating non-anonymous BTF_KIND_FUNC_PROTO entries in some
circumstances:

$ bpf-unknown-none-gcc -c -O2 repro.i -o repro.o
$ bpftool btf dump all | grep FUNC_PROTO | grep -v anon
[8319] FUNC_PROTO '____kretprobe_ieee80211_get_channel_khz' ret_type_id=3D7
vlen=3D2
[8321] FUNC_PROTO '____kprobe_ieee80211_scan_completed' ret_type_id=3D7 vle=
n=3D2
[8333] FUNC_PROTO '____kprobe_ieee80211_request_scan' ret_type_id=3D7 vlen=
=3D2
[8343] FUNC_PROTO '____kprobe_unregister_netdev' ret_type_id=3D7 vlen=3D2
[8345] FUNC_PROTO '____kprobe_register_netdev' ret_type_id=3D7 vlen=3D2
[8347] FUNC_PROTO '____kprobe_ieee80211_unregister_hw' ret_type_id=3D7 vlen=
=3D1
[8349] FUNC_PROTO '____kprobe_ieee80211_register_hw' ret_type_id=3D7 vlen=
=3D1
[8351] FUNC_PROTO 'log_event' ret_type_id=3D0 vlen=3D2=