[rustdoc] Box some more ItemKind variants #79975
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This should *vastly* reduce memory usage.
This was simpler than expected.
- Use a tuple struct instead of a single field - Enforce calling `source_callsite()` by making the inner span private - Rename `empty` to `dummy`
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I also tried boxing the |
This brings the sizes down to ``` [src/librustdoc/lib.rs:102] std::mem::size_of::<Item>() = 520 [src/librustdoc/lib.rs:102] std::mem::size_of::<ItemKind>() = 248 ``` from ``` [src/librustdoc/lib.rs:102] std::mem::size_of::<Item>() = 608 [src/librustdoc/lib.rs:102] std::mem::size_of::<ItemKind>() = 336 ```
This reduces the size from ``` [src/librustdoc/lib.rs:102] std::mem::size_of::<Item>() = 520 [src/librustdoc/lib.rs:102] std::mem::size_of::<ItemKind>() = 248 ``` to ``` [src/librustdoc/lib.rs:102] std::mem::size_of::<Item>() = 432 [src/librustdoc/lib.rs:102] std::mem::size_of::<ItemKind>() = 160 ```
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See #79967 (comment), I would prefer to go with #80014. |
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Builds on #79967 and #79957 and should not be merged before. Helps with #79103.