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From: "ibhagat at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/109161] Bad CTF generated for stub in function scope
Date: Wed, 12 Apr 2023 21:19:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109161

--- Comment #3 from Indu Bhagat <ibhagat at gcc dot gnu.org> ---
Excerpt from the generated DWARF debug info:
 <1><32>: Abbrev Number: 3 (DW_TAG_subprogram)
    <33>   DW_AT_external    : 1
    <33>   DW_AT_name        : (indirect string, offset: 0x12c4): set_cpu_a=
rch
    ...
    <4c>   DW_AT_sibling     : <0x8e>
 <2><50>: Abbrev Number: 4 (DW_TAG_structure_type)
    <51>   DW_AT_name        : (indirect string, offset: 0x227c):
arch_stack_entry
    ...=20
    <59>   DW_AT_sibling     : <0x70>
 <3><5d>: Abbrev Number: 5 (DW_TAG_member)
    <5e>   DW_AT_name        : (indirect string, offset: 0x79a): prev
    ...
    <65>   DW_AT_type        : <0x8e>
    <69>   DW_AT_data_member_location: 0
 <3><6a>: Abbrev Number: 6 (DW_TAG_const_type)
    <6b>   DW_AT_type        : <0x50>
 <3><6f>: Abbrev Number: 0
 <2><70>: Abbrev Number: 7 (DW_TAG_typedef)
    <71>   DW_AT_name        : (indirect string, offset: 0x227c):
arch_stack_entry
    ...
    <78>   DW_AT_type        : <0x50>
 <2><7c>: Abbrev Number: 8 (DW_TAG_variable)
    <7d>   DW_AT_name        : (indirect string, offset: 0x9c5): arch_stack=
_top
    ...
    <84>   DW_AT_type        : <0x88>
 <2><88>: Abbrev Number: 1 (DW_TAG_pointer_type)
    <89>   DW_AT_byte_size   : 8
    <89>   DW_AT_type        : <0x70>
 <2><8d>: Abbrev Number: 0
 <1><8e>: Abbrev Number: 1 (DW_TAG_pointer_type)
    <8f>   DW_AT_byte_size   : 8
    <8f>   DW_AT_type        : <0x6a>
 <1><93>: Abbrev Number: 0

I see the issues to be the result of:
#1. The gen_ctf_sou_type function is processing
   <3><6a>: Abbrev Number: 6 (DW_TAG_const_type)
   as a member of the struct.
#2. The top-level DIE=20
   <1><8e>: Abbrev Number: 1 (DW_TAG_pointer_type)
   is being processed by ctf_do_die.=