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GH-90997: Document `CACHE`s by brandtbucher · Pull Request #95694 · python/cpython · GitHub

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GH-90997: Document CACHEs #95694

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brandtbucher merged 2 commits into from
Aug 5, 2022
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GH-90997: Document CACHEs #95694

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e8c6528
Add docs for CACHE
brandtbucher Aug 5, 2022
9544955
fixup
brandtbucher Aug 5, 2022
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18 changes: 18 additions & 0 deletions Doc/library/dis.rst
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Expand Up @@ -408,6 +408,24 @@ The Python compiler currently generates the following bytecode instructions.
.. versionadded:: 3.11


.. opcode:: CACHE

Rather than being an actual instruction, this opcode is used to mark extra
space for the interpreter to cache useful data directly in the bytecode
itself. It is automatically hidden by all ``dis`` utilities, but can be
viewed with ``show_caches=True``.

Logically, this space is part of the preceding instruction. Many opcodes
expect to be followed by an exact number of caches, and will instruct the
interpreter to skip over them at runtime.

Populated caches can look like arbitrary instructions, so great care should
be taken when reading or modifying raw, adaptive bytecode containing
quickened data.

.. versionadded:: 3.11


**Unary operations**

Unary operations take the top of the stack, apply the operation, and push the
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7 changes: 7 additions & 0 deletions Doc/whatsnew/3.11.rst
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Expand Up @@ -1165,6 +1165,13 @@ contributors are volunteers from the community.
CPython bytecode changes
========================

* The bytecode now contains inline cache entries, which take the form of
:opcode:`CACHE` instructions. Many opcodes expect to be followed by an exact
number of caches, and instruct the interpreter to skip over them at runtime.
Populated caches can look like arbitrary instructions, so great care should be
taken when reading or modifying raw, adaptive bytecode containing quickened
data.

* Replaced all numeric ``BINARY_*`` and ``INPLACE_*`` instructions with a single
:opcode:`BINARY_OP` implementation.

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