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bpo-43693: Compute deref offsets in compiler (gh-25152)

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Merges locals and cells into a single array.
Saves a pointer in the interpreter and means that we don't need the LOAD_CLOSURE opcode any more

https://bugs.python.org/issue43693
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Mark Shannon 2021-06-04 01:03:54 +01:00 • committed by GitHub
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Doc/library/dis.rst
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@ -1058,16 +1058,24 @@ All of the following opcodes use their arguments.
.. opcode:: LOAD_CLOSURE (i)
Pushes a reference to the cell contained in slot *i* of the cell and free
variable storage. The name of the variable is
``co_fastlocalnames[i + len(co_varnames)]``.
Pushes a reference to the cell contained in slot ``i`` of the "fast locals"
storage. The name of the variable is ``co_fastlocalnames[i]``.
Note that ``LOAD_CLOSURE`` is effectively an alias for ``LOAD_FAST``.
It exists to keep bytecode a little more readable.
.. versionchanged:: 3.11
``i`` is no longer offset by the length of ``co_varnames``.
.. opcode:: LOAD_DEREF (i)
Loads the cell contained in slot *i* of the cell and free variable storage.
Loads the cell contained in slot ``i`` of the "fast locals" storage.
Pushes a reference to the object the cell contains on the stack.
.. versionchanged:: 3.11
``i`` is no longer offset by the length of ``co_varnames``.
.. opcode:: LOAD_CLASSDEREF (i)
@ -1077,20 +1085,29 @@ All of the following opcodes use their arguments.
.. versionadded:: 3.4
.. versionchanged:: 3.11
``i`` is no longer offset by the length of ``co_varnames``.
.. opcode:: STORE_DEREF (i)
Stores TOS into the cell contained in slot *i* of the cell and free variable
Stores TOS into the cell contained in slot ``i`` of the "fast locals"
storage.
.. versionchanged:: 3.11
``i`` is no longer offset by the length of ``co_varnames``.
.. opcode:: DELETE_DEREF (i)
Empties the cell contained in slot *i* of the cell and free variable storage.
Empties the cell contained in slot ``i`` of the "fast locals" storage.
Used by the :keyword:`del` statement.
.. versionadded:: 3.2
.. versionchanged:: 3.11
``i`` is no longer offset by the length of ``co_varnames``.
.. opcode:: RAISE_VARARGS (argc)