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Rollup merge of #119872 - compiler-errors:eagerly-emit-delayed-bugs, r=oli-obk,nnethercote
Give me a way to emit all the delayed bugs as errors (add `-Zeagerly-emit-delayed-bugs`) This is probably a *better* way to inspect all the delayed bugs in a program that what exists currently (and therefore makes it very easy to choose the right number `N` with `-Zemit-err-as-bug=N`, though I guess the naming is a bit ironic when you pair both of the flags together, but that feels like naming bikeshed more than anything). This pacifies my only concern with https://github.com/rust-lang/rust/pull/119871#issuecomment-1888170259, because (afaict?) that PR doesn't allow you to intercept a delayed bug's stack trace anymore, which as someone who debugs the compiler a lot, is something that I can *promise* that I do. r? `@nnethercote` or `@oli-obk`
This commit is contained in:
commit
504794b908
@ -85,7 +85,7 @@ fn source_string(file: Lrc<SourceFile>, line: &Line) -> String {
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/// Maps `Diagnostic::Level` to `snippet::AnnotationType`
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fn annotation_type_for_level(level: Level) -> AnnotationType {
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match level {
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Level::Bug | Level::DelayedBug | Level::Fatal | Level::Error => AnnotationType::Error,
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Level::Bug | Level::DelayedBug(_) | Level::Fatal | Level::Error => AnnotationType::Error,
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Level::ForceWarning(_) | Level::Warning => AnnotationType::Warning,
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Level::Note | Level::OnceNote => AnnotationType::Note,
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Level::Help | Level::OnceHelp => AnnotationType::Help,
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@ -1,7 +1,7 @@
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use crate::snippet::Style;
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use crate::{
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CodeSuggestion, DiagnosticBuilder, DiagnosticMessage, EmissionGuarantee, Level, MultiSpan,
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SubdiagnosticMessage, Substitution, SubstitutionPart, SuggestionStyle,
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CodeSuggestion, DelayedBugKind, DiagnosticBuilder, DiagnosticMessage, EmissionGuarantee, Level,
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MultiSpan, SubdiagnosticMessage, Substitution, SubstitutionPart, SuggestionStyle,
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};
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use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
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use rustc_error_messages::fluent_value_from_str_list_sep_by_and;
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@ -243,12 +243,15 @@ impl Diagnostic {
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pub fn is_error(&self) -> bool {
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match self.level {
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Level::Bug | Level::DelayedBug | Level::Fatal | Level::Error | Level::FailureNote => {
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true
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}
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Level::Bug
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| Level::DelayedBug(DelayedBugKind::Normal)
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| Level::Fatal
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| Level::Error
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| Level::FailureNote => true,
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Level::ForceWarning(_)
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| Level::Warning
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| Level::DelayedBug(DelayedBugKind::GoodPath)
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| Level::Note
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| Level::OnceNote
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| Level::Help
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@ -318,7 +321,7 @@ impl Diagnostic {
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"downgrade_to_delayed_bug: cannot downgrade {:?} to DelayedBug: not an error",
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self.level
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);
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self.level = Level::DelayedBug;
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self.level = Level::DelayedBug(DelayedBugKind::Normal);
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}
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/// Appends a labeled span to the diagnostic.
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@ -519,6 +519,12 @@ fn default_track_diagnostic(diag: Diagnostic, f: &mut dyn FnMut(Diagnostic)) {
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pub static TRACK_DIAGNOSTIC: AtomicRef<fn(Diagnostic, &mut dyn FnMut(Diagnostic))> =
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AtomicRef::new(&(default_track_diagnostic as _));
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#[derive(Copy, PartialEq, Eq, Clone, Hash, Debug, Encodable, Decodable)]
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pub enum DelayedBugKind {
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Normal,
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GoodPath,
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}
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#[derive(Copy, Clone, Default)]
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pub struct DiagCtxtFlags {
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/// If false, warning-level lints are suppressed.
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@ -527,6 +533,9 @@ pub struct DiagCtxtFlags {
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/// If Some, the Nth error-level diagnostic is upgraded to bug-level.
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/// (rustc: see `-Z treat-err-as-bug`)
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pub treat_err_as_bug: Option<NonZeroUsize>,
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/// Eagerly emit delayed bugs as errors, so that the compiler debugger may
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/// see all of the errors being emitted at once.
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pub eagerly_emit_delayed_bugs: bool,
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/// Show macro backtraces.
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/// (rustc: see `-Z macro-backtrace`)
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pub macro_backtrace: bool,
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@ -541,8 +550,7 @@ impl Drop for DiagCtxtInner {
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self.emit_stashed_diagnostics();
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if !self.has_errors() {
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let bugs = std::mem::replace(&mut self.span_delayed_bugs, Vec::new());
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self.flush_delayed(bugs, "no errors encountered even though `span_delayed_bug` issued");
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self.flush_delayed(DelayedBugKind::Normal)
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}
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// FIXME(eddyb) this explains what `good_path_delayed_bugs` are!
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@ -551,11 +559,7 @@ impl Drop for DiagCtxtInner {
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// lints can be `#[allow]`'d, potentially leading to this triggering.
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// Also, "good path" should be replaced with a better naming.
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if !self.has_printed && !self.suppressed_expected_diag && !std::thread::panicking() {
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let bugs = std::mem::replace(&mut self.good_path_delayed_bugs, Vec::new());
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self.flush_delayed(
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bugs,
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"no warnings or errors encountered even though `good_path_delayed_bugs` issued",
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);
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self.flush_delayed(DelayedBugKind::GoodPath);
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}
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if self.check_unstable_expect_diagnostics {
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@ -865,7 +869,8 @@ impl DiagCtxt {
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if treat_next_err_as_bug {
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self.bug(msg);
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}
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DiagnosticBuilder::<ErrorGuaranteed>::new(self, DelayedBug, msg).emit()
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DiagnosticBuilder::<ErrorGuaranteed>::new(self, DelayedBug(DelayedBugKind::Normal), msg)
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.emit()
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}
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/// Like `delayed_bug`, but takes an additional span.
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@ -882,16 +887,15 @@ impl DiagCtxt {
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if treat_next_err_as_bug {
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self.span_bug(sp, msg);
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}
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DiagnosticBuilder::<ErrorGuaranteed>::new(self, DelayedBug, msg).with_span(sp).emit()
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DiagnosticBuilder::<ErrorGuaranteed>::new(self, DelayedBug(DelayedBugKind::Normal), msg)
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.with_span(sp)
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.emit()
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}
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// FIXME(eddyb) note the comment inside `impl Drop for DiagCtxtInner`, that's
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// where the explanation of what "good path" is (also, it should be renamed).
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pub fn good_path_delayed_bug(&self, msg: impl Into<DiagnosticMessage>) {
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let mut inner = self.inner.borrow_mut();
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let diagnostic = Diagnostic::new(DelayedBug, msg);
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let backtrace = std::backtrace::Backtrace::capture();
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inner.good_path_delayed_bugs.push(DelayedDiagnostic::with_backtrace(diagnostic, backtrace));
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DiagnosticBuilder::<()>::new(self, DelayedBug(DelayedBugKind::GoodPath), msg).emit()
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}
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#[track_caller]
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@ -1218,9 +1222,7 @@ impl DiagCtxt {
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}
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pub fn flush_delayed(&self) {
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let mut inner = self.inner.borrow_mut();
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let bugs = std::mem::replace(&mut inner.span_delayed_bugs, Vec::new());
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inner.flush_delayed(bugs, "no errors encountered even though `span_delayed_bug` issued");
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self.inner.borrow_mut().flush_delayed(DelayedBugKind::Normal);
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}
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}
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@ -1270,17 +1272,30 @@ impl DiagCtxtInner {
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return None;
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}
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if diagnostic.level == DelayedBug {
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// FIXME(eddyb) this should check for `has_errors` and stop pushing
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// once *any* errors were emitted (and truncate `span_delayed_bugs`
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// when an error is first emitted, also), but maybe there's a case
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// in which that's not sound? otherwise this is really inefficient.
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let backtrace = std::backtrace::Backtrace::capture();
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self.span_delayed_bugs
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.push(DelayedDiagnostic::with_backtrace(diagnostic.clone(), backtrace));
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// FIXME(eddyb) this should check for `has_errors` and stop pushing
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// once *any* errors were emitted (and truncate `span_delayed_bugs`
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// when an error is first emitted, also), but maybe there's a case
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// in which that's not sound? otherwise this is really inefficient.
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match diagnostic.level {
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DelayedBug(_) if self.flags.eagerly_emit_delayed_bugs => {
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diagnostic.level = Error;
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}
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DelayedBug(DelayedBugKind::Normal) => {
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let backtrace = std::backtrace::Backtrace::capture();
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self.span_delayed_bugs
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.push(DelayedDiagnostic::with_backtrace(diagnostic.clone(), backtrace));
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#[allow(deprecated)]
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return Some(ErrorGuaranteed::unchecked_claim_error_was_emitted());
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#[allow(deprecated)]
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return Some(ErrorGuaranteed::unchecked_claim_error_was_emitted());
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}
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DelayedBug(DelayedBugKind::GoodPath) => {
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let backtrace = std::backtrace::Backtrace::capture();
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self.good_path_delayed_bugs
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.push(DelayedDiagnostic::with_backtrace(diagnostic.clone(), backtrace));
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return None;
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}
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_ => {}
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}
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if diagnostic.has_future_breakage() {
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@ -1396,11 +1411,18 @@ impl DiagCtxtInner {
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self.emit_diagnostic(Diagnostic::new(FailureNote, msg));
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}
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fn flush_delayed(
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&mut self,
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bugs: Vec<DelayedDiagnostic>,
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explanation: impl Into<DiagnosticMessage> + Copy,
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) {
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fn flush_delayed(&mut self, kind: DelayedBugKind) {
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let (bugs, explanation) = match kind {
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DelayedBugKind::Normal => (
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std::mem::take(&mut self.span_delayed_bugs),
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"no errors encountered even though `span_delayed_bug` issued",
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),
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DelayedBugKind::GoodPath => (
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std::mem::take(&mut self.good_path_delayed_bugs),
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"no warnings or errors encountered even though `good_path_delayed_bugs` issued",
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),
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};
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if bugs.is_empty() {
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return;
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}
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@ -1433,7 +1455,7 @@ impl DiagCtxtInner {
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if backtrace || self.ice_file.is_none() { bug.decorate() } else { bug.inner };
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// "Undelay" the `DelayedBug`s (into plain `Bug`s).
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if bug.level != DelayedBug {
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if !matches!(bug.level, DelayedBug(_)) {
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// NOTE(eddyb) not panicking here because we're already producing
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// an ICE, and the more information the merrier.
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bug.subdiagnostic(InvalidFlushedDelayedDiagnosticLevel {
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@ -1521,8 +1543,9 @@ pub enum Level {
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/// silently dropped. I.e. "expect other errors are emitted" semantics. Useful on code paths
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/// that should only be reached when compiling erroneous code.
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///
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/// Its `EmissionGuarantee` is `ErrorGuaranteed`.
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DelayedBug,
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/// Its `EmissionGuarantee` is `ErrorGuaranteed` for `Normal` delayed bugs, and `()` for
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/// `GoodPath` delayed bugs.
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DelayedBug(DelayedBugKind),
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/// An error that causes an immediate abort. Used for things like configuration errors,
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/// internal overflows, some file operation errors.
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@ -1597,7 +1620,7 @@ impl Level {
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fn color(self) -> ColorSpec {
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let mut spec = ColorSpec::new();
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match self {
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Bug | DelayedBug | Fatal | Error => {
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Bug | DelayedBug(_) | Fatal | Error => {
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spec.set_fg(Some(Color::Red)).set_intense(true);
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}
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ForceWarning(_) | Warning => {
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@ -1617,7 +1640,7 @@ impl Level {
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pub fn to_str(self) -> &'static str {
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match self {
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Bug | DelayedBug => "error: internal compiler error",
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Bug | DelayedBug(_) => "error: internal compiler error",
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Fatal | Error => "error",
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ForceWarning(_) | Warning => "warning",
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Note | OnceNote => "note",
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@ -1146,6 +1146,7 @@ impl UnstableOptions {
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DiagCtxtFlags {
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can_emit_warnings,
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treat_err_as_bug: self.treat_err_as_bug,
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eagerly_emit_delayed_bugs: self.eagerly_emit_delayed_bugs,
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macro_backtrace: self.macro_backtrace,
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deduplicate_diagnostics: self.deduplicate_diagnostics,
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track_diagnostics: self.track_diagnostics,
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@ -1583,6 +1583,9 @@ options! {
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"version of DWARF debug information to emit (default: 2 or 4, depending on platform)"),
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dylib_lto: bool = (false, parse_bool, [UNTRACKED],
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"enables LTO for dylib crate type"),
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eagerly_emit_delayed_bugs: bool = (false, parse_bool, [UNTRACKED],
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"emit delayed bugs eagerly as errors instead of stashing them and emitting \
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them only if an error has not been emitted"),
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ehcont_guard: bool = (false, parse_bool, [TRACKED],
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"generate Windows EHCont Guard tables"),
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emit_stack_sizes: bool = (false, parse_bool, [UNTRACKED],
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11
tests/ui/treat-err-as-bug/eagerly-emit.rs
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11
tests/ui/treat-err-as-bug/eagerly-emit.rs
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@ -0,0 +1,11 @@
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// compile-flags: -Zeagerly-emit-delayed-bugs
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trait Foo {}
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fn main() {}
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fn f() -> impl Foo {
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//~^ ERROR the trait bound `i32: Foo` is not satisfied
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//~| ERROR `report_selection_error` did not emit an error
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1i32
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}
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28
tests/ui/treat-err-as-bug/eagerly-emit.stderr
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28
tests/ui/treat-err-as-bug/eagerly-emit.stderr
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@ -0,0 +1,28 @@
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error: `report_selection_error` did not emit an error
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--> $DIR/eagerly-emit.rs:7:11
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LL | fn f() -> impl Foo {
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| ^^^^^^^^
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error: trimmed_def_paths constructed but no error emitted; use `DelayDm` for lints or `with_no_trimmed_paths` for debugging
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error[E0277]: the trait bound `i32: Foo` is not satisfied
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--> $DIR/eagerly-emit.rs:7:11
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LL | fn f() -> impl Foo {
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| ^^^^^^^^ the trait `Foo` is not implemented for `i32`
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...
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LL | 1i32
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| ---- return type was inferred to be `i32` here
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help: this trait has no implementations, consider adding one
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--> $DIR/eagerly-emit.rs:3:1
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LL | trait Foo {}
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| ^^^^^^^^^
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error: expected fulfillment errors
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error: aborting due to 4 previous errors
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For more information about this error, try `rustc --explain E0277`.
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