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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug symtab/26390] gdb.fortran/mixed-lang-stack.exp: error reading
 variable in backtrace
Date: Fri, 14 Aug 2020 12:03:55 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26390

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
In the dwarf info, we have:
...
 <1><11f0>: Abbrev Number: 14 (DW_TAG_subprogram)
    <11f1>   DW_AT_name        : mixed_func_1b
    <11f7>   DW_AT_linkage_name: mixed_func_1b_
 <1><1162>: Abbrev Number: 10 (DW_TAG_base_type)
    <1163>   DW_AT_byte_size   : 8
    <1164>   DW_AT_encoding    : 5      (signed)
    <1165>   DW_AT_name        : integer(kind=3D8)
 <1><1169>: Abbrev Number: 7 (DW_TAG_const_type)
    <116a>   DW_AT_type        : <0x1162>
 <2><1250>: Abbrev Number: 9 (DW_TAG_formal_parameter)
    <1251>   DW_AT_name        : e
    <1255>   DW_AT_type        : <0x142c>
    <1259>   DW_AT_location    : 4 byte block: 91 98 7f 6       (DW_OP_fbre=
g:
-104; DW_OP_deref)
 <2><126c>: Abbrev Number: 19 (DW_TAG_formal_parameter)
    <126d>   DW_AT_name        : _e
    <1270>   DW_AT_type        : <0x1169>
    <1274>   DW_AT_artificial  : 1
    <1274>   DW_AT_location    : 2 byte block: 91 0     (DW_OP_fbreg: 0)
 <1><142c>: Abbrev Number: 27 (DW_TAG_string_type)
    <142d>   DW_AT_string_length: 5 byte block: 99 4d 2 0 0     (DW_OP_call=
4:
<0x126c>)
 <2><1437>: Abbrev Number: 28 (DW_TAG_subrange_type)
    <1438>   DW_AT_type        : <0x1162>
    <143c>   DW_AT_upper_bound : <0x126c>
...

It seems at least interesting that the string type at 0x142c has two ways to
get to the length: via DW_AT_string_length and via DW_AT_upper_bound.

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