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From: "tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug rust/30330] GDB 13.1 no longer prints length of Rust slice
 wrappers
Date: Tue, 11 Apr 2023 11:47:09 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30330

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
Apparently the intent now is to print the underlying
data in the slice, not just the shape of it.
However gdb stumbles over this obviously incorrect debuginfo:

 <2><2699>: Abbrev Number: 7 (DW_TAG_structure_type)
    <269a>   DW_AT_name        : (indirect string, offset: 0x41a): Foo<[u8]>
    <269e>   DW_AT_byte_size   : 0
    <269f>   DW_AT_alignment   : 1

This structure does not really have a byte size of 0,
because it has this member:

 <3><26a9>: Abbrev Number: 25 (DW_TAG_member)
    <26aa>   DW_AT_name        : (indirect string, offset: 0xff104): value
    <26ae>   DW_AT_type        : <0x23b0>
    <26b2>   DW_AT_byte_size   : 1
    <26b3>   DW_AT_bit_size    : 0
    <26b4>   DW_AT_bit_offset  : 8
    <26b5>   DW_AT_data_member_location: 0

This seems to be a rustc bug.

I don't know yet if this can be worked around in a reasonable way.

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