[PATCH 3/5] objdump: Add variable types and structure for DWARF info parsing

[Jan Beulich]

On 27.08.2025 13:35, Guillaume VACHERIAS - foss wrote:
> +/* Container for map info information to be generated.  */ typedef 
> +struct base_type {
> +  uint64_t die_offset;
> +  uint64_t usize;
> +  int64_t ssize;
> +  const unsigned char *name;
> 
> I forgot to explain why the field storing attribute DW_AT_name is unsigned char *
> and not plain text. It is mentioned in the DWARF Debugging Information Format
> Standard that:
> "Any debugging information entry representing a program entity that has been
> given a name may have a DW_AT_name attribute, whose value of class string
> represents the name".
> 
> Where again mentioned that a string:
> " A string is a sequence of contiguous non-null bytes followed by one null
> byte. A string may be represented:
> - Immediately in the debugging information entry itself (DW_FORM_string),
> - As an offset into a string table contained in the .debug_str section of
> the object file (DW_FORM_strp), the .debug_line_str section of the
> object file (DW_FORM_line_strp), or as an offset into a string table
> contained in the .debug_str section of a supplementary object file
> (DW_FORM_strp_sup). DW_FORM_strp_sup offsets from the
> .debug_info section of a supplementary object file refer to the local
> .debug_str section of that same file. In the 32-bit DWARF format, the
> representation of a DW_FORM_strp, DW_FORM_line_strp or
> DW_FORM_strp_sup value is a 4-byte unsigned offset; in the 64-bit
> DWARF format, it is an 8-byte unsigned offset.
> - As an indirect offset into the string table using an index into a table of
> offsets contained in the .debug_str_offsets section of the object file
> (DW_FORM_strx, DW_FORM_strx1, DW_FORM_strx2,
> DW_FORM_strx3 and DW_FORM_strx4). The representation of a
> DW_FORM_strx value is an unsigned LEB128 value, which is
> interpreted as a zero-based index into an array of offsets in the
> .debug_str_offsets section. The representation of a
> DW_FORM_strx1, DW_FORM_strx2, DW_FORM_strx3 or
> DW_FORM_strx4 value is a 1-, 2-, 3- or 4-byte unsigned integer value,
> respectively, which is similarly interpreted. The offset entries in the
> .debug_str_offsets section have the same representation as
> DW_FORM_strp values. ".

I can't spot where "unsigned" is demanded in all of this text.

Jan