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GH-93429: Document LOAD_METHOD removal#93803

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Documentation for removing LOAD_METHOD
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@Fidget-Spinner
Fidget-Spinner committedJun 14, 2022
commit7a8c3d6ec14d203db0c0a68f291e0563071b7a40
27 changes: 14 additions & 13 deletionsDoc/library/dis.rst
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Expand Up@@ -887,7 +887,20 @@ iterations of the loop.

.. 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>>i]`` 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)
Expand DownExpand Up@@ -1189,18 +1202,6 @@ iterations of the loop.
.. 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

Pushes a ``NULL`` to the stack.
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9 changes: 9 additions & 0 deletionsDoc/whatsnew/3.12.rst
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Expand Up@@ -106,6 +106,15 @@ Optimizations
(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
==========

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