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Factor out common emit_producing_guarantee code.

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This commit is contained in:
Nicholas Nethercote 2023-12-18 17:02:37 +11:00
parent f5459201e0
commit 9ed87336b0
1 changed files with 21 additions and 43 deletions
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64
compiler/rustc_errors/src/diagnostic_builder.rs
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@ -112,6 +112,22 @@ pub trait EmissionGuarantee: Sized {
fn emit_producing_guarantee(db: &mut DiagnosticBuilder<'_, Self>) -> Self::EmitResult;
}
impl<'a, G: EmissionGuarantee> DiagnosticBuilder<'a, G> {
/// Most `emit_producing_guarantee` functions use this as a starting point.
fn emit_producing_nothing(&mut self) {
match self.inner.state {
// First `.emit()` call, the `&DiagCtxt` is still available.
DiagnosticBuilderState::Emittable(dcx) => {
self.inner.state = DiagnosticBuilderState::AlreadyEmittedOrDuringCancellation;
dcx.emit_diagnostic_without_consuming(&mut self.inner.diagnostic);
}
// `.emit()` was previously called, disallowed from repeating it.
DiagnosticBuilderState::AlreadyEmittedOrDuringCancellation => {}
}
}
}
impl<'a> DiagnosticBuilder<'a, ErrorGuaranteed> {
/// Discard the guarantee `.emit()` would return, in favor of having the
/// type `DiagnosticBuilder<'a, ()>`. This may be necessary whenever there
@ -124,6 +140,7 @@ impl<'a> DiagnosticBuilder<'a, ErrorGuaranteed> {
// FIXME(eddyb) make `ErrorGuaranteed` impossible to create outside `.emit()`.
impl EmissionGuarantee for ErrorGuaranteed {
fn emit_producing_guarantee(db: &mut DiagnosticBuilder<'_, Self>) -> Self::EmitResult {
// Contrast this with `emit_producing_nothing`.
match db.inner.state {
// First `.emit()` call, the `&DiagCtxt` is still available.
DiagnosticBuilderState::Emittable(dcx) => {
@ -165,16 +182,7 @@ impl EmissionGuarantee for ErrorGuaranteed {
// FIXME(eddyb) should there be a `Option<ErrorGuaranteed>` impl as well?
impl EmissionGuarantee for () {
fn emit_producing_guarantee(db: &mut DiagnosticBuilder<'_, Self>) -> Self::EmitResult {
match db.inner.state {
// First `.emit()` call, the `&DiagCtxt` is still available.
DiagnosticBuilderState::Emittable(dcx) => {
db.inner.state = DiagnosticBuilderState::AlreadyEmittedOrDuringCancellation;
dcx.emit_diagnostic_without_consuming(&mut db.inner.diagnostic);
}
// `.emit()` was previously called, disallowed from repeating it.
DiagnosticBuilderState::AlreadyEmittedOrDuringCancellation => {}
}
db.emit_producing_nothing();
}
}
@ -187,17 +195,7 @@ impl EmissionGuarantee for BugAbort {
type EmitResult = !;
fn emit_producing_guarantee(db: &mut DiagnosticBuilder<'_, Self>) -> Self::EmitResult {
match db.inner.state {
// First `.emit()` call, the `&DiagCtxt` is still available.
DiagnosticBuilderState::Emittable(dcx) => {
db.inner.state = DiagnosticBuilderState::AlreadyEmittedOrDuringCancellation;
dcx.emit_diagnostic_without_consuming(&mut db.inner.diagnostic);
}
// `.emit()` was previously called, disallowed from repeating it.
DiagnosticBuilderState::AlreadyEmittedOrDuringCancellation => {}
}
// Then panic. No need to return the marker type.
db.emit_producing_nothing();
panic::panic_any(ExplicitBug);
}
}
@ -211,34 +209,14 @@ impl EmissionGuarantee for FatalAbort {
type EmitResult = !;
fn emit_producing_guarantee(db: &mut DiagnosticBuilder<'_, Self>) -> Self::EmitResult {
match db.inner.state {
// First `.emit()` call, the `&DiagCtxt` is still available.
DiagnosticBuilderState::Emittable(dcx) => {
db.inner.state = DiagnosticBuilderState::AlreadyEmittedOrDuringCancellation;
dcx.emit_diagnostic_without_consuming(&mut db.inner.diagnostic);
}
// `.emit()` was previously called, disallowed from repeating it.
DiagnosticBuilderState::AlreadyEmittedOrDuringCancellation => {}
}
// Then fatally error, returning `!`
db.emit_producing_nothing();
crate::FatalError.raise()
}
}
impl EmissionGuarantee for rustc_span::fatal_error::FatalError {
fn emit_producing_guarantee(db: &mut DiagnosticBuilder<'_, Self>) -> Self::EmitResult {
match db.inner.state {
// First `.emit()` call, the `&DiagCtxt` is still available.
DiagnosticBuilderState::Emittable(dcx) => {
db.inner.state = DiagnosticBuilderState::AlreadyEmittedOrDuringCancellation;
dcx.emit_diagnostic_without_consuming(&mut db.inner.diagnostic);
}
// `.emit()` was previously called, disallowed from repeating it.
DiagnosticBuilderState::AlreadyEmittedOrDuringCancellation => {}
}
// Then fatally error..
db.emit_producing_nothing();
rustc_span::fatal_error::FatalError
}
}