GH-122390: Replace _Py_GetbaseOpcode with _Py_GetBaseCodeUnit (GH-122942)

Author: markshannon

Include/internal/pycore_code.h

@@ -586,7 +586,7 @@ adaptive_counter_backoff(_Py_BackoffCounter counter) {
 
 extern int _Py_Instrument(PyCodeObject *co, PyInterpreterState *interp);
 
-extern int _Py_GetBaseOpcode(PyCodeObject *code, int offset);
+extern _Py_CODEUNIT _Py_GetBaseCodeUnit(PyCodeObject *code, int offset);
 
 extern int _PyInstruction_GetLength(PyCodeObject *code, int offset);
 

Include/internal/pycore_magic_number.h

@@ -256,6 +256,7 @@ Known values:
     Python 3.14a1 3602 (Add LOAD_SPECIAL. Remove BEFORE_WITH and BEFORE_ASYNC_WITH)
     Python 3.14a1 3603 (Remove BUILD_CONST_KEY_MAP)
     Python 3.14a1 3604 (Do not duplicate test at end of while statements)
+    Python 3.14a1 3605 (Move ENTER_EXECUTOR to opcode 255)
 
     Python 3.15 will start with 3650
 
@@ -268,7 +269,7 @@ PC/launcher.c must also be updated.
 
 */
 
-#define PYC_MAGIC_NUMBER 3604
+#define PYC_MAGIC_NUMBER 3605
 /* This is equivalent to converting PYC_MAGIC_NUMBER to 2 bytes
    (little-endian) and then appending b'\r\n'. */
 #define PYC_MAGIC_NUMBER_TOKEN \

Include/internal/pycore_opcode_metadata.h

@@ -17,7 +17,7 @@ def check_bool_function_result(self, func, ops, expected):
                 self.assertEqual(func(op), expected)
 
     def test_invalid_opcodes(self):
-        invalid = [-100, -1, 255, 512, 513, 1000]
+        invalid = [-100, -1, 512, 513, 1000]
         self.check_bool_function_result(_opcode.is_valid, invalid, False)
         self.check_bool_function_result(_opcode.has_arg, invalid, False)
         self.check_bool_function_result(_opcode.has_const, invalid, False)