Hi Timothy,
On Tue, 4 Dec 2018 at 02:31, Timothy Baldridge <[email protected]> wrote:
> I have the following code in my interpreter, and I'm getting an error message
> I haven't seen before:
>
> @specialize.call_location()
> def assoc(self, *kws):
> (...)
> for idx in unrolling_iterable(range(0, len(kws), 2)):
The problem might be that the call to unrolling_iterable() should not
be seen in RPython code, as far as I know. It should only occur
outside compiled functions.
It might be possible to rewrite your example to do that but it's not
completely obvious how. Here's how I would do it instead. Use the
fact that any function with ``*args`` is automatically specialized
based on the number of arguments (no @specialize needed):
def assoc(self, *kws):
new_dict = {}
shape = self.get_shape()
for k in shape.attr_list():
new_dict[k] = shape.getter_for(k).get_value(self)
_turn_to_dict(new_dict, kws)
return DictStruct(new_dict)
def _turn_to_dict(new_dict, *kws):
if not kws: return # done
new_dict[kws[0]] = kws[1]
_turn_to_dict(new_dict, *kws[2:])
This looks like a recursive call, but it isn't: the function
"_turn_to_dict_6" calls "_turn_to_dict_4", which calls
"_turn_to_dict_2", etc. And at each level the tuple "kws" is replaced
with individual arguments: nobody is actually making and inspecting
any tuple at runtime. Most or all of the levels of calls are inlined
because each function is small enough.
A bientôt,
Armin.
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