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From: "bernd.edlinger at hotmail dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/94474] Incorrect DWARF range information for inlined
 function
Date: Mon, 06 Apr 2020 09:59:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94474

--- Comment #1 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Hi,

I use a newer binutils versions FWIW, and buit GCC-10 from
a few days ago using those binutils.

$ readelf -version
GNU readelf (GNU Binutils) 2.32
Copyright (C) 2019 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) any later vers=
ion.
This program has absolutely no warranty.

instead of
    #+BEGIN_EXAMPLE
       <2><8db>: Abbrev Number: 38 (DW_TAG_inlined_subroutine)
          <8dc>   DW_AT_abstract_origin: <0x9cc>
          <8e0>   DW_AT_entry_pc    : 0x400545
          <8e8>   Unknown AT value: 2138: 3
          <8e9>   DW_AT_ranges      : 0x30
          <8ed>   DW_AT_call_file   : 1
          <8ee>   DW_AT_call_line   : 52
          <8ef>   DW_AT_call_column : 10
          <8f0>   DW_AT_sibling     : <0x92f>
    #+END_EXAMPLE

 I see:

 <2><8b3>: Abbrev Number: 38 (DW_TAG_inlined_subroutine)
    <8b4>   DW_AT_abstract_origin: <0x9a4>
    <8b8>   DW_AT_entry_pc    : 0x401165
    <8c0>   DW_AT_GNU_entry_view: 0
    <8c1>   DW_AT_ranges      : 0x30
    <8c5>   DW_AT_call_file   : 1
    <8c6>   DW_AT_call_line   : 52
    <8c7>   DW_AT_call_column : 10
    <8c8>   DW_AT_sibling     : <0x907>

But as you can see there is a view number where
the range begins, but there is no view number where
the range ends.

I am not sure if there are any view numbers when
the inline has multiple ranges, (I dont remember)

Therefore I try to chamge gdb to ignore is-stmt breakpoints
which are at the end of the inline block.

I am not sure if an entirely new DWARF version is necessary,
or just a new  AT value: like 2139 or so, to give us
an idea if the is-stmt is per its view in the subroutine
or in the calling program.


Bernd.=