Am 23.03.23 um 09:45 schrieb Martin Frb via fpc-devel:
It's a little hard to comment all at once, but at least I start with one :)
4) "official" marker for string vs pchar vs array
Not sure if that is reported already. Depending on dwarf version
"string" (ansistring) is a pointer (either TAG pointer/reference or
location expression) to
- char (dwarf 2)
- array of char (dwarf 3)
Currently for dwarf 2, the debugger can't tell the difference. If the
user says: foo[1]
The debugger does not know, if the first or second char is meant (0 or 1
based index)
With dwarf 3 the difference would be in the display format "('a', 'b',
'c') vs 'abc'.
But currently the debugger (fpdebug) can tell the difference, because
fpc has a tiny difference in how it encodes the "stride".
That is obviously an implementation detail, and not very future proof.
Therefore an "official" marker would be nice.
- it appears there is none in dwarf
- it could be a custom addition to dwarf
- documenting an "implementation detail" (such as the stride), so
fpdebug can safely rely on it.
What about using DW_TAG_string_type for this? IIRC, when I implemented
dwarf, it was not available/not supported, but fpdebug can do they. I am
not sure about the status of GDB about it though :)
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