mirror of
https://github.com/danbulant/oxc
synced 2026-05-25 04:42:10 +00:00
f159f60084
## Why
Due to the usage of `&'alloc mut T` in `oxc_allocator::Box`, and
`bumpalo::collections::Vec` in `oxc_allocator::Vec`, ast types are
currently invariant over their allocator lifetime `'a`. This prevents
`ouroboros` from generating `borrow_*` on ast type fields, leading to
the unfriendly `with_*` api:
c250b288ef/crates/oxc_parser/examples/multi-thread.rs (L82-L84)
## How
- For `oxc_allocator::Vec`, switch to `allocator_api2::vec::Vec`, which
has a covariant relationship with the allocator lifetime.
- For `oxc_allocator::Box`, use `std::ptr::NonNull` which is
specifically designed to be covariant. I don't use
`allocator_api2::boxed::Box` because it holds the allocator for
dropping, so the size is bigger.
## Downside
Now that `oxc_allocator::Box` uses the unsafe `NonNull`. It has to be a
private field to be safe. This make it impossible to do `Box(....)`
pattern matching.
26 lines
634 B
TOML
26 lines
634 B
TOML
[package]
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name = "oxc_allocator"
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version = "0.12.3"
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authors.workspace = true
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description.workspace = true
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edition.workspace = true
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homepage.workspace = true
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keywords.workspace = true
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license.workspace = true
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repository.workspace = true
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rust-version.workspace = true
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categories.workspace = true
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[lints]
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workspace = true
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[lib]
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doctest = false
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[dependencies]
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bumpalo = { workspace = true, features = ["collections", "allocator-api2"] }
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serde = { workspace = true }
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allocator-api2 = { workspace = true }
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[dev-dependencies]
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serde_json = { workspace = true }
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