Hopefully the first issue has now been resolved, although it may require
refactoring later.
https://gitlab.com/freepascal.org/fpc/source/-/merge_requests/691
The main issue is that, for some reason, trying to dereference from a
code section instead of a data section raises an access violation,
although I'm not sure if it's a permissions issue or a subtle fault with
the pointers. This may require refactoring later on or if bugs manifest
in larger projects.
Kit
On 26/05/2024 21:33, J. Gareth Moreton via fpc-devel wrote:
Thank you for all your assistance with this Sven.
One trick I have been doing is writing equivalent programs in C/C++ to
see how Clang and MSVC convert them into equivalent assembly
language. It's providing some insights at least in regards to what
works. My first attempted fix (putting the jump table in the same
section as the actual code) unfortunately didn't work, so it's
something more subtle.
Kit
On 26/05/2024 11:55, Sven Barth via fpc-devel wrote:
J. Gareth Moreton via fpc-devel <fpc-devel@lists.freepascal.org>
schrieb am Sa., 25. Mai 2024, 22:18:
Indeed - I'm not giving up! I installed Clang via LLVM. Which
of the EXE files is actually the assembler? It's not entirely
clear (no "clang-as", for example). (Although I trust it works!)
Simply check what FPC calls. ;)
I've got some ideas as to how to start debugging. I will solve
this puzzle!
There is a tool that converts DWARF to CodeView, you can use that to
debug with WinDBG.
Regards,
Sven
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