FIXES bytecodealliance#137: make calling wasm from python 7x faster

wasmtime/_func.py

@@ -67,7 +67,7 @@ def type(self, store: Storelike) -> FuncType:
     def _create_raw_vals(self, *params: IntoVal) -> ctypes.Array[wasmtime_val_raw_t]:
         raw = self._vals_raw_type()
         for i, param_str in enumerate(self._params_str):
-            val_setter(raw[i], param_str, params[i])
+            val_setter(self._func.store_id, raw[i], param_str, params[i])
         return raw
 
     def _extract_return(self, vals_raw: ctypes.Array[wasmtime_val_raw_t]) -> Union[IntoVal, Sequence[IntoVal], None]:

wasmtime/_value.py

@@ -63,7 +63,7 @@ def val_getter(store_id: int, val_raw: wasmtime_val_raw_t, attr: str) -> typing.
     return val
 
 
-def val_setter(dst: wasmtime_val_raw_t, attr: str, val: "IntoVal") -> None:
+def val_setter(store_id: int, dst: wasmtime_val_raw_t, attr: str, val: "IntoVal") -> None:
     casted: typing.Union[Any, int, float, None, wasmtime.Func]
     if attr == 'externref':
         if isinstance(val, Val) and val._raw and val._raw.kind == WASMTIME_EXTERNREF.value:
@@ -78,7 +78,8 @@ def val_setter(dst: wasmtime_val_raw_t, attr: str, val: "IntoVal") -> None:
         if isinstance(val, Val) and val._raw and val._raw.kind == WASMTIME_FUNCREF.value:
             casted = val._raw.of.funcref.index
         elif isinstance(val, wasmtime.Func):
-            # TODO: validate same val._func.store_id
+            if val._func.store_id != store_id:
+                raise TypeError("passed funcref does not belong to same store")
             casted = val._func.index
         else:
             raise RuntimeError("expecting param of type funcref got " + type(val).__name__)