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Fix __dict__ getset type by youknowone · Pull Request #6010 · RustPython/RustPython

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Walkthrough

The change refactors the process of adding the __dict__ descriptor during Python type object creation. Instead of inserting the descriptor before the type is created, it now adds it directly to the type's attributes after initialization, using a different method and maintaining the same condition for insertion. Additionally, the logic for locating the base type with a dictionary and retrieving the __dict__ descriptor is restructured with new helper functions, improving alignment with CPython's approach.

Changes

File(s) Change Summary
vm/src/builtins/type.rs Moved __dict__ descriptor insertion to after type object creation with unsafe attribute insertion; replaced find_base_dict_descr with get_builtin_base_with_dict and get_dict_descriptor; rewrote subtype_get_dict and subtype_set_dict to use new helper functions and updated error handling.

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant PyTypeConstructor
    participant TypeObject
    participant BaseTypeWithDict
    participant DictDescriptor

    Caller->>PyTypeConstructor: Create new type
    PyTypeConstructor->>TypeObject: Initialize type object
    alt If base is not type
        PyTypeConstructor->>TypeObject: Insert __dict__ descriptor (post-creation)
    end
    Caller->>TypeObject: Access __dict__
    TypeObject->>BaseTypeWithDict: Find builtin base with dict
    BaseTypeWithDict->>DictDescriptor: Lookup __dict__ descriptor
    DictDescriptor->>TypeObject: Get or set __dict__ value
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Estimated code review effort

2 (60 minutes)

Possibly related PRs

  • type.__dict__ #5957: Adds tests and minor constructor logic changes related to __dict__ presence in type and subclasses, closely related to managing the __dict__ descriptor in PyType.

Poem

In the warren of code, a change takes flight,
The __dict__ now lands after type’s first light.
No more before—now after, it’s true,
With careful precision, the rabbits renew.
Hopping through Rust, descriptors in tow,
The type’s little secrets continue to grow! 🐇

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📥 Commits

Reviewing files that changed from the base of the PR and between 5717700 and f9557a0.

📒 Files selected for processing (1)
  • vm/src/builtins/type.rs (5 hunks)
🚧 Files skipped from review as they are similar to previous changes (1)
  • vm/src/builtins/type.rs
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