DW_AT_string_length is described as "that provides the value of the
length of the string"
Is that the length in characters or bytes?
That matters for e.g. Utf-16 when the DW_TAG_base_type for the char has
a DW_AT_byte_size of 2 (or more).
Below is from the draft for DWARF-6, but the same info is in earlier
versions.
5.11 String Type Entries
The string type entry may also have a DW_AT_string_length attribute whose
value is either (a) a reference (see Section 2.19) to another debugging
information
entry that provides the value of the length of the string, or (b) a location
description yielding the location where the length of the string is stored in
the
program. If the DW_AT_string_length attribute is not present, the size of the
string is assumed to be the amount of storage that is allocated for the string
(as
specified by the DW_AT_byte_size or DW_AT_bit_size attribute)
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