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GH-93429: Document LOAD_METHOD removal (GH-93803)

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Ken Jin 2022-06-14 21:43:28 +08:00 • committed by GitHub
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2 changed files with 23 additions and 13 deletions
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27
Doc/library/dis.rst
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@ -887,7 +887,20 @@ iterations of the loop.
.. opcode:: LOAD_ATTR (namei) .. opcode:: LOAD_ATTR (namei)
Replaces TOS with ``getattr(TOS, co_names[namei])``. If the low bit of ``namei`` is not set, this replaces TOS with
``getattr(TOS, co_names[namei>>1])``.
If the low bit of ``namei`` is set, this will attempt to load a method named
``co_names[namei>>1]`` from the TOS object. TOS is popped.
This bytecode distinguishes two cases: if TOS has a method with the correct
name, the bytecode pushes the unbound method and TOS. TOS will be used as
the first argument (``self``) by :opcode:`CALL` when calling the
unbound method. Otherwise, ``NULL`` and the object return by the attribute
lookup are pushed.
.. versionchanged:: 3.11
If the low bit of ``namei`` is set, then a ``NULL`` or ``self`` is
pushed to the stack before the attribute or unbound method respectively.
.. opcode:: COMPARE_OP (opname) .. opcode:: COMPARE_OP (opname)
@ -1189,18 +1202,6 @@ iterations of the loop.
.. versionadded:: 3.6 .. versionadded:: 3.6
.. opcode:: LOAD_METHOD (namei)
Loads a method named ``co_names[namei]`` from the TOS object. TOS is popped.
This bytecode distinguishes two cases: if TOS has a method with the correct
name, the bytecode pushes the unbound method and TOS. TOS will be used as
the first argument (``self``) by :opcode:`CALL` when calling the
unbound method. Otherwise, ``NULL`` and the object return by the attribute
lookup are pushed.
.. versionadded:: 3.7
.. opcode:: PUSH_NULL .. opcode:: PUSH_NULL
Pushes a ``NULL`` to the stack. Pushes a ``NULL`` to the stack.

9
Doc/whatsnew/3.12.rst
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@ -106,6 +106,15 @@ Optimizations
(Contributed by Inada Naoki in :gh:`92536`.) (Contributed by Inada Naoki in :gh:`92536`.)
CPython bytecode changes
========================
* Removed the :opcode:`LOAD_METHOD` instruction. It has been merged into
:opcode:`LOAD_ATTR`. :opcode:`LOAD_ATTR` will now behave like the old
:opcode:`LOAD_METHOD` instruction if the low bit of its oparg is set.
(Contributed by Ken Jin in :gh:`93429`.)
Deprecated Deprecated
========== ==========