[ENH] spm-specific Runtime class

Author: balbasty

spm/_runtime.py

@@ -0,0 +1,23 @@
+from mpython.runtime import Runtime as RuntimeBase
+
+
+class Runtime(RuntimeBase):
+    """
+    Runtime specialization that imports the correct CTF.
+    """
+
+    @classmethod
+    def _import_runtime(cls):
+        import spm_runtime
+        return spm_runtime
+
+
+class RuntimeMixin:
+    """
+    Mixin that SPM classes must inherit so that they can call the
+    correct runtime.
+    """
+
+    @classmethod
+    def _runtime(cls):
+        return Runtime