gh-138912: Add dedicated opcodes for MatchClass without positional sub-patterns

Author: cdce8p

Doc/library/dis.rst

@@ -1737,6 +1737,25 @@ iterations of the loop.
    .. versionadded:: 3.13
 
 
+.. opcode:: MATCH_CLASS_ISINSTANCE
+
+   Read match subject ``Stack[-2]`` and the type object ``Stack[-1]`` from stack.
+   Pop ``Stack[-1]`` and push ``True`` or ``False`` for the result of :func:`isinstance`.
+
+   .. versionadded:: 3.15
+
+
+.. opcode:: MATCH_CLASS_GET_OPT_ATTR (namei)
+
+   Replaces ``STACK[-1]`` with ``getattr(STACK[-1], co_names[namei])`` and get
+   optional attribute from match subject ``STACK[-2]``.
+
+   Pop ``Stack[-1]``. If attribute is found, push it and ``True`` onto the stack.
+   Otherwise push ``None`` and ``False``.
+
+   .. versionadded:: 3.15
+
+
 .. opcode:: MATCH_CLASS (count)
 
    ``STACK[-1]`` is a tuple of keyword attribute names, ``STACK[-2]`` is the class

Include/internal/pycore_magic_number.h

@@ -286,6 +286,7 @@ Known values:
     Python 3.15a1 3653 (Fix handling of opcodes that may leave operands on the stack when optimizing LOAD_FAST)
     Python 3.15a1 3654 (Fix missing exception handlers in logical expression)
     Python 3.15a1 3655 (Fix miscompilation of some module-level annotations)
+    Python 3.15a1 3656 (Add MATCH_CLASS_ISINSTANCE & MATCH_CLASS_GET_OPT_ATTR)
 
 
     Python 3.16 will start with 3700
@@ -299,7 +300,7 @@ PC/launcher.c must also be updated.
 
 */
 
-#define PYC_MAGIC_NUMBER 3655
+#define PYC_MAGIC_NUMBER 3656
 /* This is equivalent to converting PYC_MAGIC_NUMBER to 2 bytes
    (little-endian) and then appending b'\r\n'. */
 #define PYC_MAGIC_NUMBER_TOKEN \