feat(vm/slot): implement `Py_TPFLAGS_MANAGED_DICT` for class objects by ever0de · Pull Request #5949 · RustPython/RustPython

ever0de

Walkthrough

The changes introduce a new MANAGED_DICT flag to the type flags system and update type construction logic to conditionally set the HAS_DICT and MANAGED_DICT flags only when the __slots__ attribute is absent. This refines the way the runtime tracks dictionary management capabilities of Python types.

Changes

File(s)	Change Summary
vm/src/builtins/type.rs	Adjusted type construction: `HAS_DICT` and new `MANAGED_DICT` flags set only if `__slots__` absent. Removed old TODO comment.
vm/src/types/slot.rs	Added `MANAGED_DICT` constant to `PyTypeFlags` bitflags struct.

Poem

In the warren of types, a new flag appears,
For managed dicts, the intent now clears.
If slots are defined, no dicts to be found,
But without them, both flags abound!
With bits set just right, the VM hops on,
Type logic refined, and the bugs are all gone.
🐇✨

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Reviewing files that changed from the base of the PR and between 5284b73 and 32b24c1.

⛔ Files ignored due to path filters (4)

Lib/test/test_array.py is excluded by !Lib/**
Lib/test/test_importlib/test_metadata_api.py is excluded by !Lib/**
Lib/test/test_property.py is excluded by !Lib/**
Lib/test/test_weakref.py is excluded by !Lib/**

📒 Files selected for processing (2)

vm/src/builtins/type.rs (1 hunks)
vm/src/types/slot.rs (1 hunks)

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**/*.rs

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🔇 Additional comments (2)

vm/src/types/slot.rs (1)

125-125: LGTM - Correct implementation of MANAGED_DICT flag.

The new MANAGED_DICT flag is properly implemented following the existing pattern. The bit position (1 << 4 = 16) is appropriate and doesn't conflict with existing flags.

vm/src/builtins/type.rs (1)

1072-1077: LGTM - Correct conditional flag setting logic.

The implementation properly conditionalizes the HAS_DICT and MANAGED_DICT flags based on the presence of __slots__. This aligns with CPython's behavior where types defining __slots__ don't use managed dictionaries for attribute storage. The logic is clear and well-commented.

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