[WIP] Implement subroutine opcodes

Author: Peppece

eth/vm/computation.py

@@ -333,7 +333,7 @@ def rstack_push_int(self) -> Callable[[int], None]:
         return self._rstack.push_int
 
     @cached_property
-    def rstack_pop1_int(self) -> Callable[[int]], None]:
+    def rstack_pop1_int(self) -> Callable[[int], None]:
         return self._rstack.pop1_int
 
     #

eth/vm/rstack.py

@@ -48,3 +48,17 @@ def push_int(self) -> int:
     def pop1_int(self) -> int:
         #
         # Note: This function is optimized for speed over readability.
+        #
+        if not self.values:
+            raise InsufficientStack("Wanted 1 stack item as int, had none")
+        else:
+            item_type, popped = self._pop_typed()
+            if item_type is int:
+                return popped  # type: ignore
+            elif item_type is bytes:
+                return big_endian_to_int(popped)  # type: ignore
+            else:
+                raise ValidationError(
+                "Stack must always be bytes or int, "
+                f"got {item_type!r} type, val {value!r}"
+                )