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b65fab6299
`rustc_errors` depends on numerous crates, solely to implement its `IntoDiagArg` trait on types from those crates. Many crates depend on `rustc_errors`, and it's on the critical path. We can't swap things around to make all of those crates depend on `rustc_errors` instead, because `rustc_errors` would end up in dependency cycles. Instead, move `IntoDiagArg` into `rustc_error_messages`, which has far fewer dependencies, and then have most of these crates depend on `rustc_error_messages`. This allows `rustc_errors` to drop dependencies on several crates, including the large `rustc_target`. (This doesn't fully reduce dependency chains yet, as `rustc_errors` still depends on `rustc_hir` which depends on `rustc_target`. That will get fixed in a subsequent commit.)
56 lines
1.8 KiB
Rust
56 lines
1.8 KiB
Rust
use std::borrow::Cow;
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use std::fmt::{self, Display};
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use std::sync::OnceLock;
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use rustc_error_messages::{DiagArgValue, IntoDiagArg};
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use rustc_macros::{
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Decodable, Encodable, HashStable_Generic, PrintAttribute, current_rustc_version,
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};
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use crate::attrs::PrintAttribute;
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#[derive(Encodable, Decodable, Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
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#[derive(HashStable_Generic, PrintAttribute)]
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pub struct RustcVersion {
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pub major: u16,
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pub minor: u16,
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pub patch: u16,
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}
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impl RustcVersion {
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pub const CURRENT: Self = current_rustc_version!();
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pub fn current_overridable() -> Self {
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*CURRENT_OVERRIDABLE.get_or_init(|| {
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if let Ok(override_var) = std::env::var("RUSTC_OVERRIDE_VERSION_STRING")
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&& let Some(override_) = Self::parse_str(&override_var)
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{
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override_
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} else {
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Self::CURRENT
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}
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})
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}
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fn parse_str(value: &str) -> Option<Self> {
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// Ignore any suffixes such as "-dev" or "-nightly".
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let mut components = value.split('-').next().unwrap().splitn(3, '.');
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let major = components.next()?.parse().ok()?;
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let minor = components.next()?.parse().ok()?;
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let patch = components.next().unwrap_or("0").parse().ok()?;
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Some(RustcVersion { major, minor, patch })
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}
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}
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static CURRENT_OVERRIDABLE: OnceLock<RustcVersion> = OnceLock::new();
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impl Display for RustcVersion {
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fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(formatter, "{}.{}.{}", self.major, self.minor, self.patch)
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}
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}
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impl IntoDiagArg for RustcVersion {
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fn into_diag_arg(self, _: &mut Option<std::path::PathBuf>) -> DiagArgValue {
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DiagArgValue::Str(Cow::Owned(self.to_string()))
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}
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}
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