In particular, i64/double are actually supposed to be aligned
to their size on RISC-V (at least according to the ELF psABI),
though it is unclear to me whether this actually caused any
issues.
Artiq assumes that all exceptions raised by the kernel can be constructed with
a single string argument. This isn't always the case. Especially for
exceptions that originated in python and were propagated to the kernel over
rpc.
With out this change a mosek solver failure looks like:
```
ERROR root:logging_tools.py:41 Terminating with exception (TypeError: __init__() missing 1 required positional argument: 'msg')
Traceback (most recent call last):
File "/home/mb/.cache/pypoetry/virtualenvs/ion-transport-1-b41LI0-py3.8/lib/python3.8/site-packages/artiq/master/worker_impl.py", line 540, in main
exp_inst.run()
File "/home/mb/.cache/pypoetry/virtualenvs/ion-transport-1-b41LI0-py3.8/lib/python3.8/site-packages/artiq/test_tools/experiment.py", line 82, in wrapper
meth()
File "/home/mb/.cache/pypoetry/virtualenvs/ion-transport-1-b41LI0-py3.8/lib/python3.8/site-packages/artiq/language/core.py", line 54, in run_on_core
return getattr(self, arg).run(run_on_core, ((self,) + k_args), k_kwargs)
File "/home/mb/.cache/pypoetry/virtualenvs/ion-transport-1-b41LI0-py3.8/lib/python3.8/site-packages/artiq/coredevice/core.py", line 152, in run
self.comm.serve(embedding_map, symbolizer, demangler)
File "/home/mb/.cache/pypoetry/virtualenvs/ion-transport-1-b41LI0-py3.8/lib/python3.8/site-packages/artiq/coredevice/comm_kernel.py", line 720, in serve
self._serve_exception(embedding_map, symbolizer, demangler)
File "/home/mb/.cache/pypoetry/virtualenvs/ion-transport-1-b41LI0-py3.8/lib/python3.8/site-packages/artiq/coredevice/comm_kernel.py", line 699, in _serve_exception
python_exn = python_exn_type(
TypeError: __init__() missing 1 required positional argument: 'msg'
```
With this change we get:
```
ERROR root:logging_tools.py:41 Terminating with exception (RuntimeError: Exception type=<class 'mosek.Error'>, which couldn't be reconstructed (__init__() missing 1 required positional argument: 'msg'))
Core Device Traceback:
Traceback (most recent call first):
File "/home/mb/oxionics/ion-transport/tests/test_end_to_end.py", line 280, in get_transport
return self.seq.solve()
File "/home/mb/oxionics/ion-transport/tests/test_end_to_end.py", line 288, in artiq_worker_test_end_to_end.TransportTestScan.run(..., ...) (RA=+0x2e4)
self.seq.record(self.get_transport(1e-6 + 1e-7 * x))
mosek.Error(27): rescode.err_license_expired(1001): The license has expired.
End of Core Device Traceback
Traceback (most recent call last):
File "/home/mb/oxionics/artiq/artiq/master/worker_impl.py", line 540, in main
exp_inst.run()
File "/home/mb/oxionics/artiq/artiq/test_tools/experiment.py", line 82, in wrapper
meth()
File "/home/mb/oxionics/artiq/artiq/language/core.py", line 54, in run_on_core
return getattr(self, arg).run(run_on_core, ((self,) + k_args), k_kwargs)
File "/home/mb/oxionics/artiq/artiq/coredevice/core.py", line 152, in run
self.comm.serve(embedding_map, symbolizer, demangler)
File "/home/mb/oxionics/artiq/artiq/coredevice/comm_kernel.py", line 732, in serve
self._serve_exception(embedding_map, symbolizer, demangler)
File "/home/mb/oxionics/artiq/artiq/coredevice/comm_kernel.py", line 714, in _serve_exception
raise python_exn
RuntimeError: Exception type=<class 'mosek.Error'>, which couldn't be reconstructed (__init__() missing 1 required positional argument: 'msg')
```
Signed-off-by: Michael Birtwell <michael.birtwell@oxionics.com>
