On 23/10/2021 14:04, Martin via fpc-devel wrote:
Could anyone from the team comment on the following issue please?
https://gitlab.com/freepascal.org/lazarus/lazarus/-/merge_requests/28
It seems with -O2 FPC may set the location of a variable to a register
(which is correct).
But it then attempts
DW_OP_push_object_address, DW_OP_deref
which may not be correct (not sure, but read my big comment on the issue)
While -O2 is normally not for debugging, it may still be desirable
that debug info is at least conform to the DWARF standard.
Looking at GDB.
From what I can see, current gdb (git main) fails in the IDE, on the
"ptype s", because the upper bound is expected to be a constant, but it
is not. (gdb bug)
Outside the IDE "p S" returns without error, but empty result.
I looked at the code "expr.c"
DW_OP_deref will always call
this->read_mem (buf, addr, addr_size);
So even if it gets a value from the register, gdb (most likely) would
not take the register content as the deref value, but deref it again.
_______________________________________________
fpc-devel maillist - fpc-devel@lists.freepascal.org
https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
