do not add type watchers for immutable types

kumaraditya303 · kumaraditya303 · commit 75500b1335e5 · 2026-03-26T11:42:11.000+05:30
diff --git a/Python/optimizer_analysis.c b/Python/optimizer_analysis.c
@@ -369,8 +369,10 @@ lookup_attr(JitOptContext *ctx, _PyBloomFilter *dependencies, _PyUOpInstruction
         if (lookup) {
             int opcode = _Py_IsImmortal(lookup) ? immortal : mortal;
             ADD_OP(opcode, 0, (uintptr_t)lookup);
-            PyType_Watch(TYPE_WATCHER_ID, (PyObject *)type);
-            _Py_BloomFilter_Add(dependencies, type);
+            if ((type->tp_flags & Py_TPFLAGS_IMMUTABLETYPE) == 0) {
+                PyType_Watch(TYPE_WATCHER_ID, (PyObject *)type);
+                _Py_BloomFilter_Add(dependencies, type);
+            }
             return sym_new_const(ctx, lookup);
         }
     }

Original file line number	Diff line number	Diff line change
`@@ -369,8 +369,10 @@ lookup_attr(JitOptContext ctx, _PyBloomFilter dependencies, _PyUOpInstruction`
`369`	`369`	`if (lookup) {`
`370`	`370`	`int opcode = _Py_IsImmortal(lookup) ? immortal : mortal;`
`371`	`371`	`ADD_OP(opcode, 0, (uintptr_t)lookup);`
`372`		`- PyType_Watch(TYPE_WATCHER_ID, (PyObject *)type);`
`373`		`- _Py_BloomFilter_Add(dependencies, type);`
	`372`	`+ if ((type->tp_flags & Py_TPFLAGS_IMMUTABLETYPE) == 0) {`
	`373`	`+ PyType_Watch(TYPE_WATCHER_ID, (PyObject *)type);`
	`374`	`+ _Py_BloomFilter_Add(dependencies, type);`
	`375`	`+ }`
`374`	`376`	`return sym_new_const(ctx, lookup);`
`375`	`377`	`}`
`376`	`378`	`}`