gh-115999: Add free-threaded specialization for CONTAINS_OP

Author: corona10

Lib/test/test_dis.py

@@ -1335,6 +1335,27 @@ def test_call_specialize(self):
         got = self.get_disassembly(co, adaptive=True)
         self.do_disassembly_compare(got, call_quicken)
 
+    @cpython_only
+    @requires_specialization_ft
+    def test_contains_specialize(self):
+        contains_op_quicken = """\
+  0           RESUME_CHECK             0
+
+  1           LOAD_NAME                0 (a)
+              LOAD_NAME                1 (b)
+              %s
+              RETURN_VALUE
+"""
+        co_dict = compile('a in b', "<dict>", "eval")
+        self.code_quicken(lambda: exec(co_dict, {}, {'a': 1, 'b': {1: 5}}))
+        got = self.get_disassembly(co_dict, adaptive=True)
+        self.do_disassembly_compare(got, contains_op_quicken % "CONTAINS_OP_DICT         0 (in)")
+
+        co_set = compile('a in b', "<set>", "eval")
+        self.code_quicken(lambda: exec(co_set, {}, {'a': 1.0, 'b': {1, 2, 3}}))
+        got = self.get_disassembly(co_set, adaptive=True)
+        self.do_disassembly_compare(got, contains_op_quicken % "CONTAINS_OP_SET          0 (in)")
+
     @cpython_only
     @requires_specialization
     def test_loop_quicken(self):

Python/bytecodes.c

@@ -2508,7 +2508,7 @@ dummy_func(
         }
 
         specializing op(_SPECIALIZE_CONTAINS_OP, (counter/1, left, right -- left, right)) {
-            #if ENABLE_SPECIALIZATION
+            #if ENABLE_SPECIALIZATION_FT
             if (ADAPTIVE_COUNTER_TRIGGERS(counter)) {
                 next_instr = this_instr;
                 _Py_Specialize_ContainsOp(right, next_instr);

Python/generated_cases.c.h

@@ -2747,25 +2747,27 @@ _Py_Specialize_ContainsOp(_PyStackRef value_st, _Py_CODEUNIT *instr)
 {
     PyObject *value = PyStackRef_AsPyObjectBorrow(value_st);
 
-    assert(ENABLE_SPECIALIZATION);
+    assert(ENABLE_SPECIALIZATION_FT);
     assert(_PyOpcode_Caches[CONTAINS_OP] == INLINE_CACHE_ENTRIES_COMPARE_OP);
+    uint8_t specialized_op;
     _PyContainsOpCache *cache = (_PyContainsOpCache  *)(instr + 1);
     if (PyDict_CheckExact(value)) {
-        instr->op.code = CONTAINS_OP_DICT;
+        specialized_op = CONTAINS_OP_DICT;
         goto success;
     }
     if (PySet_CheckExact(value) || PyFrozenSet_CheckExact(value)) {
-        instr->op.code = CONTAINS_OP_SET;
+        specialized_op = CONTAINS_OP_SET;
         goto success;
     }
 
     SPECIALIZATION_FAIL(CONTAINS_OP, containsop_fail_kind(value));
     STAT_INC(CONTAINS_OP, failure);
-    instr->op.code = CONTAINS_OP;
+    SET_OPCODE_OR_RETURN(instr, CONTAINS_OP);
     cache->counter = adaptive_counter_backoff(cache->counter);
     return;
 success:
     STAT_INC(CONTAINS_OP, success);
+    SET_OPCODE_OR_RETURN(instr, specialized_op);
     cache->counter = adaptive_counter_cooldown();
 }