https://sourceware.org/bugzilla/show_bug.cgi?id=31111
Aaron Merey <amerey at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amerey at redhat dot com
Resolution|--- |FIXED
Status|NEW |RESOLVED
--- Comment #5 from Aaron Merey <amerey at redhat dot com> ---
Fixed in the following commit:
commit add63e0317b6e27dd4077b19e998e6c56a3becb5
Author: Aaron Merey <ame...@redhat.com>
Date: Fri Feb 9 21:10:19 2024 -0500
Handle DW_AT_decl_file 0
Modify dwarf_decl_file to support DW_AT_decl_file with value 0.
Because of inconsistencies in the DWARF 5 spec, it is ambiguous whether
DW_AT_decl_file value 0 is a valid .debug_line file table index for the
main source file or if it means that there is no source file specified.
dwarf_decl_file interprets DW_AT_decl_file 0 as meaning no source file
is specified. This works with DWARF 5 produced by gcc, which duplicates
the main source file name at index 0 and 1 of the file table and avoids
using DW_AT_decl_file 0.
However clang uses DW_AT_decl_file 0 for the main source index with no
duplication at another index. In this case dwarf_decl_file will be
unable to find the file name of the main file.
This patch changes dwarf_decl_file to treat DW_AT_decl_file 0 as a normal
index into the file table, allowing it to work with DWARF 5 debuginfo
produced by clang.
As for earlier DWARF versions which exclusively use DW_AT_decl_file 0
to indicate that no source file is specified, dwarf_decl_file will now
return the name "???" if called on a DIE with DW_AT_decl_file 0.
https://sourceware.org/bugzilla/show_bug.cgi?id=31111
Signed-off-by: Aaron Merey <ame...@redhat.com>
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