ruff/crates/ruff_python_semantic/Cargo.toml
Charlie Marsh 93b5d8a0fb
Implement our own small-integer optimization (#7584)
## Summary

This is a follow-up to #7469 that attempts to achieve similar gains, but
without introducing malachite. Instead, this PR removes the `BigInt`
type altogether, instead opting for a simple enum that allows us to
store small integers directly and only allocate for values greater than
`i64`:

```rust
/// A Python integer literal. Represents both small (fits in an `i64`) and large integers.
#[derive(Clone, PartialEq, Eq, Hash)]
pub struct Int(Number);

#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum Number {
    /// A "small" number that can be represented as an `i64`.
    Small(i64),
    /// A "large" number that cannot be represented as an `i64`.
    Big(Box<str>),
}

impl std::fmt::Display for Number {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Number::Small(value) => write!(f, "{value}"),
            Number::Big(value) => write!(f, "{value}"),
        }
    }
}
```

We typically don't care about numbers greater than `isize` -- our only
uses are comparisons against small constants (like `1`, `2`, `3`, etc.),
so there's no real loss of information, except in one or two rules where
we're now a little more conservative (with the worst-case being that we
don't flag, e.g., an `itertools.pairwise` that uses an extremely large
value for the slice start constant). For simplicity, a few diagnostics
now show a dedicated message when they see integers that are out of the
supported range (e.g., `outdated-version-block`).

An additional benefit here is that we get to remove a few dependencies,
especially `num-bigint`.

## Test Plan

`cargo test`
2023-09-25 15:13:21 +00:00

28 lines
782 B
TOML

[package]
name = "ruff_python_semantic"
version = "0.0.0"
publish = false
authors = { workspace = true }
edition = { workspace = true }
rust-version = { workspace = true }
homepage = { workspace = true }
documentation = { workspace = true }
repository = { workspace = true }
license = { workspace = true }
[lib]
[dependencies]
ruff_index = { path = "../ruff_index" }
ruff_python_ast = { path = "../ruff_python_ast" }
ruff_python_stdlib = { path = "../ruff_python_stdlib" }
ruff_source_file = { path = "../ruff_source_file" }
ruff_text_size = { path = "../ruff_text_size" }
bitflags = { workspace = true }
is-macro = { workspace = true }
rustc-hash = { workspace = true }
smallvec = { workspace = true }
[dev-dependencies]
ruff_python_parser = { path = "../ruff_python_parser" }