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.)
42 lines
1.2 KiB
Rust
42 lines
1.2 KiB
Rust
//! This module defines the following.
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//! - The `ErrCode` type.
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//! - A constant for every error code, with a name like `E0123`.
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//! - A static table `DIAGNOSTICS` pairing every error code constant with its
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//! long description text.
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use std::fmt;
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rustc_index::newtype_index! {
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#[max = 9999] // Because all error codes have four digits.
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#[orderable]
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#[encodable]
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#[debug_format = "ErrCode({})"]
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pub struct ErrCode {}
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}
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impl fmt::Display for ErrCode {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "E{:04}", self.as_u32())
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}
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}
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rustc_error_messages::into_diag_arg_using_display!(ErrCode);
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macro_rules! define_error_code_constants_and_diagnostics_table {
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($($name:ident: $num:literal,)*) => (
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$(
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pub const $name: $crate::ErrCode = $crate::ErrCode::from_u32($num);
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)*
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pub static DIAGNOSTICS: &[($crate::ErrCode, &str)] = &[
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$( (
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$name,
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include_str!(
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concat!("../../rustc_error_codes/src/error_codes/", stringify!($name), ".md")
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)
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), )*
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];
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)
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}
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rustc_error_codes::error_codes!(define_error_code_constants_and_diagnostics_table);
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