rustc_attr_data_structures/
version.rs1use std::fmt::{self, Display};
2use std::sync::OnceLock;
3
4use rustc_macros::{
5 Decodable, Encodable, HashStable_Generic, PrintAttribute, current_rustc_version,
6};
7
8use crate::PrintAttribute;
9
10#[derive(Encodable, Decodable, Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
11#[derive(HashStable_Generic, PrintAttribute)]
12pub struct RustcVersion {
13 pub major: u16,
14 pub minor: u16,
15 pub patch: u16,
16}
17
18impl RustcVersion {
19 pub const CURRENT: Self = current_rustc_version!();
20 pub fn current_overridable() -> Self {
21 *CURRENT_OVERRIDABLE.get_or_init(|| {
22 if let Ok(override_var) = std::env::var("RUSTC_OVERRIDE_VERSION_STRING")
23 && let Some(override_) = Self::parse_str(&override_var)
24 {
25 override_
26 } else {
27 Self::CURRENT
28 }
29 })
30 }
31 fn parse_str(value: &str) -> Option<Self> {
32 let mut components = value.split('-').next().unwrap().splitn(3, '.');
34 let major = components.next()?.parse().ok()?;
35 let minor = components.next()?.parse().ok()?;
36 let patch = components.next().unwrap_or("0").parse().ok()?;
37 Some(RustcVersion { major, minor, patch })
38 }
39}
40
41static CURRENT_OVERRIDABLE: OnceLock<RustcVersion> = OnceLock::new();
42
43impl Display for RustcVersion {
44 fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
45 write!(formatter, "{}.{}.{}", self.major, self.minor, self.patch)
46 }
47}