Fix test when the JIT is enabled only with the interpreter

python · pablogsal · Jan 27, 2026 · Jan 16, 2026 · Jan 25, 2026 · Jan 16, 2026
commit 5d53a15795ebef0801e909cd36b4e9cac0d90bc4
diff --git a/Lib/test/test_frame_pointer_unwind.py b/Lib/test/test_frame_pointer_unwind.py
@@ -86,7 +86,9 @@ def _classify_stack(stack, jit_enabled):
 def _annotate_unwind():
     stack = _build_stack_and_unwind()
     jit_enabled = hasattr(sys, "_jit") and sys._jit.is_enabled()
+    jit_backend = _testinternalcapi.get_jit_backend()
     ranges = _testinternalcapi.get_jit_code_ranges() if jit_enabled else []
+    jit_code_ranges = len(ranges)
     if jit_enabled and ranges:
         print("JIT ranges:")
         for start, end in ranges:
@@ -101,6 +103,8 @@ def _annotate_unwind():
         "python_frames": python_frames,
         "jit_frames": jit_frames,
         "other_frames": other_frames,
+        "jit_code_ranges": jit_code_ranges,
+        "jit_backend": jit_backend,
     })
 
 
@@ -163,18 +167,27 @@ def test_manual_unwind_respects_frame_pointers(self):
                 result = _manual_unwind_length(**env)
                 jit_frames = result["jit_frames"]
                 python_frames = result.get("python_frames", 0)
+                jit_backend = result.get("jit_backend")
                 if self.frame_pointers_expected:
                     self.assertGreater(
                         python_frames,
                         0,
                         f"expected to find Python frames on {self.machine} with env {env}",
                     )
                     if using_jit:
-                        self.assertGreater(
-                            jit_frames,
-                            0,
-                            f"expected to find JIT frames on {self.machine} with env {env}",
-                        )
+                        if jit_backend == "jit":
+                            self.assertGreater(
+                                jit_frames,
+                                0,
+                                f"expected to find JIT frames on {self.machine} with env {env}",
+                            )
+                        else:
+                            # jit_backend is "interpreter" or not present
+                            self.assertEqual(
+                                jit_frames,
+                                0,
+                                f"unexpected JIT frames counted on {self.machine} with env {env}",
+                            )
                     else:
                         self.assertEqual(
                             jit_frames,

diff --git a/Modules/_testinternalcapi.c b/Modules/_testinternalcapi.c
@@ -306,6 +306,18 @@ get_jit_code_ranges(PyObject *self, PyObject *Py_UNUSED(args))
     return ranges;
 }
 
+static PyObject *
+get_jit_backend(PyObject *self, PyObject *Py_UNUSED(args))
+{
+#ifdef _Py_JIT
+    return PyUnicode_FromString("jit");
+#elif defined(_Py_TIER2)
+    return PyUnicode_FromString("interpreter");
+#else
+    Py_RETURN_NONE;
+#endif
+}
+
 static PyObject *
 manual_unwind_from_fp(uintptr_t *frame_pointer)
 {
@@ -2828,6 +2840,7 @@ static PyMethodDef module_functions[] = {
     {"get_stack_margin", get_stack_margin, METH_NOARGS},
     {"classify_stack_addresses", classify_stack_addresses, METH_VARARGS},
     {"get_jit_code_ranges", get_jit_code_ranges, METH_NOARGS},
+    {"get_jit_backend", get_jit_backend, METH_NOARGS},
     {"manual_frame_pointer_unwind", manual_frame_pointer_unwind, METH_NOARGS},
     {"test_bswap", test_bswap, METH_NOARGS},
     {"test_popcount", test_popcount, METH_NOARGS},