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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] btf: function prototypes generated with name
Date: Tue, 21 Nov 2023 19:37:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112656

--- Comment #1 from Jose E. Marchesi <jemarch at gcc dot gnu.org> ---
Smaller reproducer:

  static void log_event(const char *event_name, void *dev_ptr)
  {
  }

  void lala ()
  {
    log_event ("foobar", ((void *)0));
  }

Note that the FUNC_PROTO for log_event seems to be created with a name only=
 if
the function gets inlined:

$ bpf-unknown-none-gcc -gbtf -c -O2 foo.c -o foo.o
$ bpftool btf dump file foo.o
[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED
[2] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D0
[3] FUNC_PROTO 'log_event' ret_type_id=3D1 vlen=3D2
        'event_name' type_id=3D6
        'dev_ptr' type_id=3D7
[4] INT 'char' size=3D1 bits_offset=3D0 nr_bits=3D8 encoding=3DSIGNED
[5] CONST '(anon)' type_id=3D4
[6] PTR '(anon)' type_id=3D5
[7] PTR '(anon)' type_id=3D0
[8] FUNC 'lala' type_id=3D2 linkage=3Dglobal

$ bpf-unknown-none-gcc -gbtf -c -O2 -fno-inline foo.c -o foo.o
$ /usr/sbin/bpftool btf dump file foo.o
[1] INT 'int' size=3D4 bits_offset=3D0 nr_bits=3D32 encoding=3DSIGNED
[2] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D0
[3] FUNC_PROTO '(anon)' ret_type_id=3D1 vlen=3D2
        'event_name' type_id=3D6
        'dev_ptr' type_id=3D7
[4] INT 'char' size=3D1 bits_offset=3D0 nr_bits=3D8 encoding=3DSIGNED
[5] CONST '(anon)' type_id=3D4
[6] PTR '(anon)' type_id=3D5
[7] PTR '(anon)' type_id=3D0
[8] FUNC 'lala' type_id=3D2 linkage=3Dglobal
[9] FUNC 'log_event' type_id=3D3 linkage=3Dstatic=