1 //! Diagnostics creation and emission for `rustc`.
3 //! This module contains the code for creating and emitting diagnostics.
5 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
6 #![feature(crate_visibility_modifier)]
7 #![cfg_attr(unix, feature(libc))]
9 #![feature(optin_builtin_traits)]
11 pub use emitter::ColorConfig;
15 use emitter::{is_case_difference, Emitter, EmitterWriter};
16 use registry::Registry;
17 use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
18 use rustc_data_structures::stable_hasher::StableHasher;
19 use rustc_data_structures::sync::{self, Lock, Lrc};
20 use rustc_data_structures::AtomicRef;
21 use rustc_span::source_map::SourceMap;
22 use rustc_span::{Loc, MultiSpan, Span};
27 use std::{error, fmt};
29 use termcolor::{Color, ColorSpec};
31 pub mod annotate_snippet_emitter_writer;
33 mod diagnostic_builder;
40 pub use snippet::Style;
42 pub type PResult<'a, T> = Result<T, DiagnosticBuilder<'a>>;
44 // `PResult` is used a lot. Make sure it doesn't unintentionally get bigger.
45 // (See also the comment on `DiagnosticBuilderInner`.)
46 #[cfg(target_arch = "x86_64")]
47 rustc_data_structures::static_assert_size!(PResult<'_, bool>, 16);
49 /// Indicates the confidence in the correctness of a suggestion.
51 /// All suggestions are marked with an `Applicability`. Tools use the applicability of a suggestion
52 /// to determine whether it should be automatically applied or if the user should be consulted
53 /// before applying the suggestion.
54 #[derive(Copy, Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
55 pub enum Applicability {
56 /// The suggestion is definitely what the user intended. This suggestion should be
57 /// automatically applied.
60 /// The suggestion may be what the user intended, but it is uncertain. The suggestion should
61 /// result in valid Rust code if it is applied.
64 /// The suggestion contains placeholders like `(...)` or `{ /* fields */ }`. The suggestion
65 /// cannot be applied automatically because it will not result in valid Rust code. The user
66 /// will need to fill in the placeholders.
69 /// The applicability of the suggestion is unknown.
73 #[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, RustcEncodable, RustcDecodable)]
74 pub enum SuggestionStyle {
75 /// Hide the suggested code when displaying this suggestion inline.
77 /// Always hide the suggested code but display the message.
79 /// Do not display this suggestion in the cli output, it is only meant for tools.
81 /// Always show the suggested code.
82 /// This will *not* show the code if the suggestion is inline *and* the suggested code is
85 /// Always show the suggested code independently.
89 impl SuggestionStyle {
90 fn hide_inline(&self) -> bool {
92 SuggestionStyle::ShowCode => false,
98 #[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
99 pub struct CodeSuggestion {
100 /// Each substitute can have multiple variants due to multiple
101 /// applicable suggestions
103 /// `foo.bar` might be replaced with `a.b` or `x.y` by replacing
104 /// `foo` and `bar` on their own:
108 /// Substitution { parts: vec![(0..3, "a"), (4..7, "b")] },
109 /// Substitution { parts: vec![(0..3, "x"), (4..7, "y")] },
113 /// or by replacing the entire span:
117 /// Substitution { parts: vec![(0..7, "a.b")] },
118 /// Substitution { parts: vec![(0..7, "x.y")] },
121 pub substitutions: Vec<Substitution>,
123 /// Visual representation of this suggestion.
124 pub style: SuggestionStyle,
125 /// Whether or not the suggestion is approximate
127 /// Sometimes we may show suggestions with placeholders,
128 /// which are useful for users but not useful for
129 /// tools like rustfix
130 pub applicability: Applicability,
133 #[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
134 /// See the docs on `CodeSuggestion::substitutions`
135 pub struct Substitution {
136 pub parts: Vec<SubstitutionPart>,
139 #[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
140 pub struct SubstitutionPart {
145 impl CodeSuggestion {
146 /// Returns the assembled code suggestions, whether they should be shown with an underline
147 /// and whether the substitution only differs in capitalization.
148 pub fn splice_lines(&self, cm: &SourceMap) -> Vec<(String, Vec<SubstitutionPart>, bool)> {
149 use rustc_span::{CharPos, Pos};
153 line_opt: Option<&Cow<'_, str>>,
155 hi_opt: Option<&Loc>,
157 let (lo, hi_opt) = (lo.col.to_usize(), hi_opt.map(|hi| hi.col.to_usize()));
158 if let Some(line) = line_opt {
159 if let Some(lo) = line.char_indices().map(|(i, _)| i).nth(lo) {
160 let hi_opt = hi_opt.and_then(|hi| line.char_indices().map(|(i, _)| i).nth(hi));
162 Some(hi) if hi > lo => buf.push_str(&line[lo..hi]),
164 None => buf.push_str(&line[lo..]),
167 if let None = hi_opt {
173 assert!(!self.substitutions.is_empty());
178 .map(|mut substitution| {
179 // Assumption: all spans are in the same file, and all spans
180 // are disjoint. Sort in ascending order.
181 substitution.parts.sort_by_key(|part| part.span.lo());
183 // Find the bounding span.
184 let lo = substitution.parts.iter().map(|part| part.span.lo()).min().unwrap();
185 let hi = substitution.parts.iter().map(|part| part.span.hi()).min().unwrap();
186 let bounding_span = Span::with_root_ctxt(lo, hi);
187 let lines = cm.span_to_lines(bounding_span).unwrap();
188 assert!(!lines.lines.is_empty());
190 // To build up the result, we do this for each span:
191 // - push the line segment trailing the previous span
192 // (at the beginning a "phantom" span pointing at the start of the line)
193 // - push lines between the previous and current span (if any)
194 // - if the previous and current span are not on the same line
195 // push the line segment leading up to the current span
196 // - splice in the span substitution
198 // Finally push the trailing line segment of the last span
199 let fm = &lines.file;
200 let mut prev_hi = cm.lookup_char_pos(bounding_span.lo());
201 prev_hi.col = CharPos::from_usize(0);
203 let mut prev_line = fm.get_line(lines.lines[0].line_index);
204 let mut buf = String::new();
206 for part in &substitution.parts {
207 let cur_lo = cm.lookup_char_pos(part.span.lo());
208 if prev_hi.line == cur_lo.line {
209 push_trailing(&mut buf, prev_line.as_ref(), &prev_hi, Some(&cur_lo));
211 push_trailing(&mut buf, prev_line.as_ref(), &prev_hi, None);
212 // push lines between the previous and current span (if any)
213 for idx in prev_hi.line..(cur_lo.line - 1) {
214 if let Some(line) = fm.get_line(idx) {
215 buf.push_str(line.as_ref());
219 if let Some(cur_line) = fm.get_line(cur_lo.line - 1) {
220 let end = std::cmp::min(cur_line.len(), cur_lo.col.to_usize());
221 buf.push_str(&cur_line[..end]);
224 buf.push_str(&part.snippet);
225 prev_hi = cm.lookup_char_pos(part.span.hi());
226 prev_line = fm.get_line(prev_hi.line - 1);
228 let only_capitalization = is_case_difference(cm, &buf, bounding_span);
229 // if the replacement already ends with a newline, don't print the next line
230 if !buf.ends_with('\n') {
231 push_trailing(&mut buf, prev_line.as_ref(), &prev_hi, None);
233 // remove trailing newlines
234 while buf.ends_with('\n') {
237 (buf, substitution.parts, only_capitalization)
243 pub use rustc_span::fatal_error::{FatalError, FatalErrorMarker};
245 /// Signifies that the compiler died with an explicit call to `.bug`
246 /// or `.span_bug` rather than a failed assertion, etc.
247 #[derive(Copy, Clone, Debug)]
248 pub struct ExplicitBug;
250 impl fmt::Display for ExplicitBug {
251 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
252 write!(f, "parser internal bug")
256 impl error::Error for ExplicitBug {}
258 pub use diagnostic::{Diagnostic, DiagnosticId, DiagnosticStyledString, SubDiagnostic};
259 pub use diagnostic_builder::DiagnosticBuilder;
261 /// A handler deals with errors and other compiler output.
262 /// Certain errors (fatal, bug, unimpl) may cause immediate exit,
263 /// others log errors for later reporting.
266 inner: Lock<HandlerInner>,
269 /// This inner struct exists to keep it all behind a single lock;
270 /// this is done to prevent possible deadlocks in a multi-threaded compiler,
271 /// as well as inconsistent state observation.
272 struct HandlerInner {
274 /// The number of errors that have been emitted, including duplicates.
276 /// This is not necessarily the count that's reported to the user once
277 /// compilation ends.
279 deduplicated_err_count: usize,
280 emitter: Box<dyn Emitter + sync::Send>,
281 continue_after_error: bool,
282 delayed_span_bugs: Vec<Diagnostic>,
284 /// This set contains the `DiagnosticId` of all emitted diagnostics to avoid
285 /// emitting the same diagnostic with extended help (`--teach`) twice, which
286 /// would be uneccessary repetition.
287 taught_diagnostics: FxHashSet<DiagnosticId>,
289 /// Used to suggest rustc --explain <error code>
290 emitted_diagnostic_codes: FxHashSet<DiagnosticId>,
292 /// This set contains a hash of every diagnostic that has been emitted by
293 /// this handler. These hashes is used to avoid emitting the same error
295 emitted_diagnostics: FxHashSet<u128>,
297 /// Stashed diagnostics emitted in one stage of the compiler that may be
298 /// stolen by other stages (e.g. to improve them and add more information).
299 /// The stashed diagnostics count towards the total error count.
300 /// When `.abort_if_errors()` is called, these are also emitted.
301 stashed_diagnostics: FxIndexMap<(Span, StashKey), Diagnostic>,
304 /// A key denoting where from a diagnostic was stashed.
305 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
310 fn default_track_diagnostic(_: &Diagnostic) {}
312 pub static TRACK_DIAGNOSTICS: AtomicRef<fn(&Diagnostic)> =
313 AtomicRef::new(&(default_track_diagnostic as fn(&_)));
315 #[derive(Copy, Clone, Default)]
316 pub struct HandlerFlags {
317 /// If false, warning-level lints are suppressed.
318 /// (rustc: see `--allow warnings` and `--cap-lints`)
319 pub can_emit_warnings: bool,
320 /// If true, error-level diagnostics are upgraded to bug-level.
321 /// (rustc: see `-Z treat-err-as-bug`)
322 pub treat_err_as_bug: Option<usize>,
323 /// If true, immediately emit diagnostics that would otherwise be buffered.
324 /// (rustc: see `-Z dont-buffer-diagnostics` and `-Z treat-err-as-bug`)
325 pub dont_buffer_diagnostics: bool,
326 /// If true, immediately print bugs registered with `delay_span_bug`.
327 /// (rustc: see `-Z report-delayed-bugs`)
328 pub report_delayed_bugs: bool,
329 /// show macro backtraces even for non-local macros.
330 /// (rustc: see `-Z external-macro-backtrace`)
331 pub external_macro_backtrace: bool,
332 /// If true, identical diagnostics are reported only once.
333 pub deduplicate_diagnostics: bool,
336 impl Drop for HandlerInner {
338 self.emit_stashed_diagnostics();
340 if !self.has_errors() {
341 let bugs = std::mem::replace(&mut self.delayed_span_bugs, Vec::new());
342 let has_bugs = !bugs.is_empty();
344 self.emit_diagnostic(&bug);
347 panic!("no errors encountered even though `delay_span_bug` issued");
354 pub fn with_tty_emitter(
355 color_config: ColorConfig,
356 can_emit_warnings: bool,
357 treat_err_as_bug: Option<usize>,
358 cm: Option<Lrc<SourceMap>>,
360 Self::with_tty_emitter_and_flags(
363 HandlerFlags { can_emit_warnings, treat_err_as_bug, ..Default::default() },
367 pub fn with_tty_emitter_and_flags(
368 color_config: ColorConfig,
369 cm: Option<Lrc<SourceMap>>,
372 let emitter = Box::new(EmitterWriter::stderr(
378 flags.external_macro_backtrace,
380 Self::with_emitter_and_flags(emitter, flags)
384 can_emit_warnings: bool,
385 treat_err_as_bug: Option<usize>,
386 emitter: Box<dyn Emitter + sync::Send>,
388 Handler::with_emitter_and_flags(
390 HandlerFlags { can_emit_warnings, treat_err_as_bug, ..Default::default() },
394 pub fn with_emitter_and_flags(
395 emitter: Box<dyn Emitter + sync::Send>,
400 inner: Lock::new(HandlerInner {
403 deduplicated_err_count: 0,
405 continue_after_error: true,
406 delayed_span_bugs: Vec::new(),
407 taught_diagnostics: Default::default(),
408 emitted_diagnostic_codes: Default::default(),
409 emitted_diagnostics: Default::default(),
410 stashed_diagnostics: Default::default(),
415 pub fn set_continue_after_error(&self, continue_after_error: bool) {
416 self.inner.borrow_mut().continue_after_error = continue_after_error;
419 // This is here to not allow mutation of flags;
420 // as of this writing it's only used in tests in librustc.
421 pub fn can_emit_warnings(&self) -> bool {
422 self.flags.can_emit_warnings
425 /// Resets the diagnostic error count as well as the cached emitted diagnostics.
427 /// NOTE: *do not* call this function from rustc. It is only meant to be called from external
428 /// tools that want to reuse a `Parser` cleaning the previously emitted diagnostics as well as
429 /// the overall count of emitted error diagnostics.
430 pub fn reset_err_count(&self) {
431 let mut inner = self.inner.borrow_mut();
433 inner.deduplicated_err_count = 0;
435 // actually free the underlying memory (which `clear` would not do)
436 inner.delayed_span_bugs = Default::default();
437 inner.taught_diagnostics = Default::default();
438 inner.emitted_diagnostic_codes = Default::default();
439 inner.emitted_diagnostics = Default::default();
440 inner.stashed_diagnostics = Default::default();
443 /// Stash a given diagnostic with the given `Span` and `StashKey` as the key for later stealing.
444 /// If the diagnostic with this `(span, key)` already exists, this will result in an ICE.
445 pub fn stash_diagnostic(&self, span: Span, key: StashKey, diag: Diagnostic) {
446 let mut inner = self.inner.borrow_mut();
447 if let Some(mut old_diag) = inner.stashed_diagnostics.insert((span, key), diag) {
448 // We are removing a previously stashed diagnostic which should not happen.
449 old_diag.level = Bug;
450 old_diag.note(&format!(
451 "{}:{}: already existing stashed diagnostic with (span = {:?}, key = {:?})",
457 inner.emit_diag_at_span(old_diag, span);
462 /// Steal a previously stashed diagnostic with the given `Span` and `StashKey` as the key.
463 pub fn steal_diagnostic(&self, span: Span, key: StashKey) -> Option<DiagnosticBuilder<'_>> {
467 .remove(&(span, key))
468 .map(|diag| DiagnosticBuilder::new_diagnostic(self, diag))
471 /// Emit all stashed diagnostics.
472 pub fn emit_stashed_diagnostics(&self) {
473 self.inner.borrow_mut().emit_stashed_diagnostics();
476 /// Construct a dummy builder with `Level::Cancelled`.
478 /// Using this will neither report anything to the user (e.g. a warning),
479 /// nor will compilation cancel as a result.
480 pub fn struct_dummy(&self) -> DiagnosticBuilder<'_> {
481 DiagnosticBuilder::new(self, Level::Cancelled, "")
484 /// Construct a builder at the `Warning` level at the given `span` and with the `msg`.
485 pub fn struct_span_warn(&self, span: impl Into<MultiSpan>, msg: &str) -> DiagnosticBuilder<'_> {
486 let mut result = self.struct_warn(msg);
487 result.set_span(span);
491 /// Construct a builder at the `Warning` level at the given `span` and with the `msg`.
492 /// Also include a code.
493 pub fn struct_span_warn_with_code(
495 span: impl Into<MultiSpan>,
498 ) -> DiagnosticBuilder<'_> {
499 let mut result = self.struct_span_warn(span, msg);
504 /// Construct a builder at the `Warning` level with the `msg`.
505 pub fn struct_warn(&self, msg: &str) -> DiagnosticBuilder<'_> {
506 let mut result = DiagnosticBuilder::new(self, Level::Warning, msg);
507 if !self.flags.can_emit_warnings {
513 /// Construct a builder at the `Error` level at the given `span` and with the `msg`.
514 pub fn struct_span_err(&self, span: impl Into<MultiSpan>, msg: &str) -> DiagnosticBuilder<'_> {
515 let mut result = self.struct_err(msg);
516 result.set_span(span);
520 /// Construct a builder at the `Error` level at the given `span`, with the `msg`, and `code`.
521 pub fn struct_span_err_with_code(
523 span: impl Into<MultiSpan>,
526 ) -> DiagnosticBuilder<'_> {
527 let mut result = self.struct_span_err(span, msg);
532 /// Construct a builder at the `Error` level with the `msg`.
533 // FIXME: This method should be removed (every error should have an associated error code).
534 pub fn struct_err(&self, msg: &str) -> DiagnosticBuilder<'_> {
535 DiagnosticBuilder::new(self, Level::Error, msg)
538 /// Construct a builder at the `Error` level with the `msg` and the `code`.
539 pub fn struct_err_with_code(&self, msg: &str, code: DiagnosticId) -> DiagnosticBuilder<'_> {
540 let mut result = self.struct_err(msg);
545 /// Construct a builder at the `Fatal` level at the given `span` and with the `msg`.
546 pub fn struct_span_fatal(
548 span: impl Into<MultiSpan>,
550 ) -> DiagnosticBuilder<'_> {
551 let mut result = self.struct_fatal(msg);
552 result.set_span(span);
556 /// Construct a builder at the `Fatal` level at the given `span`, with the `msg`, and `code`.
557 pub fn struct_span_fatal_with_code(
559 span: impl Into<MultiSpan>,
562 ) -> DiagnosticBuilder<'_> {
563 let mut result = self.struct_span_fatal(span, msg);
568 /// Construct a builder at the `Error` level with the `msg`.
569 pub fn struct_fatal(&self, msg: &str) -> DiagnosticBuilder<'_> {
570 DiagnosticBuilder::new(self, Level::Fatal, msg)
573 /// Construct a builder at the `Help` level with the `msg`.
574 pub fn struct_help(&self, msg: &str) -> DiagnosticBuilder<'_> {
575 DiagnosticBuilder::new(self, Level::Help, msg)
578 pub fn span_fatal(&self, span: impl Into<MultiSpan>, msg: &str) -> FatalError {
579 self.emit_diag_at_span(Diagnostic::new(Fatal, msg), span);
583 pub fn span_fatal_with_code(
585 span: impl Into<MultiSpan>,
589 self.emit_diag_at_span(Diagnostic::new_with_code(Fatal, Some(code), msg), span);
593 pub fn span_err(&self, span: impl Into<MultiSpan>, msg: &str) {
594 self.emit_diag_at_span(Diagnostic::new(Error, msg), span);
597 pub fn span_err_with_code(&self, span: impl Into<MultiSpan>, msg: &str, code: DiagnosticId) {
598 self.emit_diag_at_span(Diagnostic::new_with_code(Error, Some(code), msg), span);
601 pub fn span_warn(&self, span: impl Into<MultiSpan>, msg: &str) {
602 self.emit_diag_at_span(Diagnostic::new(Warning, msg), span);
605 pub fn span_warn_with_code(&self, span: impl Into<MultiSpan>, msg: &str, code: DiagnosticId) {
606 self.emit_diag_at_span(Diagnostic::new_with_code(Warning, Some(code), msg), span);
609 pub fn span_bug(&self, span: impl Into<MultiSpan>, msg: &str) -> ! {
610 self.inner.borrow_mut().span_bug(span, msg)
613 pub fn delay_span_bug(&self, span: impl Into<MultiSpan>, msg: &str) {
614 self.inner.borrow_mut().delay_span_bug(span, msg)
617 pub fn span_bug_no_panic(&self, span: impl Into<MultiSpan>, msg: &str) {
618 self.emit_diag_at_span(Diagnostic::new(Bug, msg), span);
621 pub fn span_note_without_error(&self, span: impl Into<MultiSpan>, msg: &str) {
622 self.emit_diag_at_span(Diagnostic::new(Note, msg), span);
625 pub fn span_note_diag(&self, span: Span, msg: &str) -> DiagnosticBuilder<'_> {
626 let mut db = DiagnosticBuilder::new(self, Note, msg);
631 pub fn failure(&self, msg: &str) {
632 self.inner.borrow_mut().failure(msg);
635 pub fn fatal(&self, msg: &str) -> FatalError {
636 self.inner.borrow_mut().fatal(msg)
639 pub fn err(&self, msg: &str) {
640 self.inner.borrow_mut().err(msg);
643 pub fn warn(&self, msg: &str) {
644 let mut db = DiagnosticBuilder::new(self, Warning, msg);
648 pub fn note_without_error(&self, msg: &str) {
649 DiagnosticBuilder::new(self, Note, msg).emit();
652 pub fn bug(&self, msg: &str) -> ! {
653 self.inner.borrow_mut().bug(msg)
656 pub fn err_count(&self) -> usize {
657 self.inner.borrow().err_count()
660 pub fn has_errors(&self) -> bool {
661 self.inner.borrow().has_errors()
663 pub fn has_errors_or_delayed_span_bugs(&self) -> bool {
664 self.inner.borrow().has_errors_or_delayed_span_bugs()
667 pub fn print_error_count(&self, registry: &Registry) {
668 self.inner.borrow_mut().print_error_count(registry)
671 pub fn abort_if_errors(&self) {
672 self.inner.borrow_mut().abort_if_errors()
675 pub fn abort_if_errors_and_should_abort(&self) {
676 self.inner.borrow_mut().abort_if_errors_and_should_abort()
679 /// `true` if we haven't taught a diagnostic with this code already.
680 /// The caller must then teach the user about such a diagnostic.
682 /// Used to suppress emitting the same error multiple times with extended explanation when
683 /// calling `-Zteach`.
684 pub fn must_teach(&self, code: &DiagnosticId) -> bool {
685 self.inner.borrow_mut().must_teach(code)
688 pub fn force_print_diagnostic(&self, db: Diagnostic) {
689 self.inner.borrow_mut().force_print_diagnostic(db)
692 pub fn emit_diagnostic(&self, diagnostic: &Diagnostic) {
693 self.inner.borrow_mut().emit_diagnostic(diagnostic)
696 fn emit_diag_at_span(&self, mut diag: Diagnostic, sp: impl Into<MultiSpan>) {
697 let mut inner = self.inner.borrow_mut();
698 inner.emit_diagnostic(diag.set_span(sp));
699 inner.abort_if_errors_and_should_abort();
702 pub fn emit_artifact_notification(&self, path: &Path, artifact_type: &str) {
703 self.inner.borrow_mut().emit_artifact_notification(path, artifact_type)
706 pub fn delay_as_bug(&self, diagnostic: Diagnostic) {
707 self.inner.borrow_mut().delay_as_bug(diagnostic)
712 fn must_teach(&mut self, code: &DiagnosticId) -> bool {
713 self.taught_diagnostics.insert(code.clone())
716 fn force_print_diagnostic(&mut self, db: Diagnostic) {
717 self.emitter.emit_diagnostic(&db);
720 /// Emit all stashed diagnostics.
721 fn emit_stashed_diagnostics(&mut self) {
722 let diags = self.stashed_diagnostics.drain(..).map(|x| x.1).collect::<Vec<_>>();
723 diags.iter().for_each(|diag| self.emit_diagnostic(diag));
726 fn emit_diagnostic(&mut self, diagnostic: &Diagnostic) {
727 if diagnostic.cancelled() {
731 if diagnostic.level == Warning && !self.flags.can_emit_warnings {
735 (*TRACK_DIAGNOSTICS)(diagnostic);
737 if let Some(ref code) = diagnostic.code {
738 self.emitted_diagnostic_codes.insert(code.clone());
741 let already_emitted = |this: &mut Self| {
743 let mut hasher = StableHasher::new();
744 diagnostic.hash(&mut hasher);
745 let diagnostic_hash = hasher.finish();
746 !this.emitted_diagnostics.insert(diagnostic_hash)
749 // Only emit the diagnostic if we've been asked to deduplicate and
750 // haven't already emitted an equivalent diagnostic.
751 if !(self.flags.deduplicate_diagnostics && already_emitted(self)) {
752 self.emitter.emit_diagnostic(diagnostic);
753 if diagnostic.is_error() {
754 self.deduplicated_err_count += 1;
757 if diagnostic.is_error() {
758 self.bump_err_count();
762 fn emit_artifact_notification(&mut self, path: &Path, artifact_type: &str) {
763 self.emitter.emit_artifact_notification(path, artifact_type);
766 fn treat_err_as_bug(&self) -> bool {
767 self.flags.treat_err_as_bug.map(|c| self.err_count() >= c).unwrap_or(false)
770 fn print_error_count(&mut self, registry: &Registry) {
771 self.emit_stashed_diagnostics();
773 let s = match self.deduplicated_err_count {
775 1 => "aborting due to previous error".to_string(),
776 count => format!("aborting due to {} previous errors", count),
778 if self.treat_err_as_bug() {
782 let _ = self.fatal(&s);
784 let can_show_explain = self.emitter.should_show_explain();
785 let are_there_diagnostics = !self.emitted_diagnostic_codes.is_empty();
786 if can_show_explain && are_there_diagnostics {
787 let mut error_codes = self
788 .emitted_diagnostic_codes
790 .filter_map(|x| match &x {
791 DiagnosticId::Error(s) if registry.find_description(s).is_some() => {
796 .collect::<Vec<_>>();
797 if !error_codes.is_empty() {
799 if error_codes.len() > 1 {
800 let limit = if error_codes.len() > 9 { 9 } else { error_codes.len() };
801 self.failure(&format!(
802 "Some errors have detailed explanations: {}{}",
803 error_codes[..limit].join(", "),
804 if error_codes.len() > 9 { "..." } else { "." }
806 self.failure(&format!(
807 "For more information about an error, try \
808 `rustc --explain {}`.",
812 self.failure(&format!(
813 "For more information about this error, try \
814 `rustc --explain {}`.",
822 fn err_count(&self) -> usize {
823 self.err_count + self.stashed_diagnostics.len()
826 fn has_errors(&self) -> bool {
829 fn has_errors_or_delayed_span_bugs(&self) -> bool {
830 self.has_errors() || !self.delayed_span_bugs.is_empty()
833 fn abort_if_errors_and_should_abort(&mut self) {
834 self.emit_stashed_diagnostics();
836 if self.has_errors() && !self.continue_after_error {
841 fn abort_if_errors(&mut self) {
842 self.emit_stashed_diagnostics();
844 if self.has_errors() {
849 fn span_bug(&mut self, sp: impl Into<MultiSpan>, msg: &str) -> ! {
850 self.emit_diag_at_span(Diagnostic::new(Bug, msg), sp);
854 fn emit_diag_at_span(&mut self, mut diag: Diagnostic, sp: impl Into<MultiSpan>) {
855 self.emit_diagnostic(diag.set_span(sp));
856 self.abort_if_errors_and_should_abort();
859 fn delay_span_bug(&mut self, sp: impl Into<MultiSpan>, msg: &str) {
860 if self.treat_err_as_bug() {
861 // FIXME: don't abort here if report_delayed_bugs is off
862 self.span_bug(sp, msg);
864 let mut diagnostic = Diagnostic::new(Level::Bug, msg);
865 diagnostic.set_span(sp.into());
866 self.delay_as_bug(diagnostic)
869 fn failure(&mut self, msg: &str) {
870 self.emit_diagnostic(&Diagnostic::new(FailureNote, msg));
873 fn fatal(&mut self, msg: &str) -> FatalError {
874 self.emit_error(Fatal, msg);
878 fn err(&mut self, msg: &str) {
879 self.emit_error(Error, msg);
882 /// Emit an error; level should be `Error` or `Fatal`.
883 fn emit_error(&mut self, level: Level, msg: &str) {
884 if self.treat_err_as_bug() {
887 self.emit_diagnostic(&Diagnostic::new(level, msg));
890 fn bug(&mut self, msg: &str) -> ! {
891 self.emit_diagnostic(&Diagnostic::new(Bug, msg));
895 fn delay_as_bug(&mut self, diagnostic: Diagnostic) {
896 if self.flags.report_delayed_bugs {
897 self.emit_diagnostic(&diagnostic);
899 self.delayed_span_bugs.push(diagnostic);
902 fn bump_err_count(&mut self) {
904 self.panic_if_treat_err_as_bug();
907 fn panic_if_treat_err_as_bug(&self) {
908 if self.treat_err_as_bug() {
909 let s = match (self.err_count(), self.flags.treat_err_as_bug.unwrap_or(0)) {
911 (1, 1) => "aborting due to `-Z treat-err-as-bug=1`".to_string(),
913 (count, as_bug) => format!(
914 "aborting after {} errors due to `-Z treat-err-as-bug={}`",
923 #[derive(Copy, PartialEq, Clone, Hash, Debug, RustcEncodable, RustcDecodable)]
935 impl fmt::Display for Level {
936 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
942 fn color(self) -> ColorSpec {
943 let mut spec = ColorSpec::new();
945 Bug | Fatal | Error => {
946 spec.set_fg(Some(Color::Red)).set_intense(true);
949 spec.set_fg(Some(Color::Yellow)).set_intense(cfg!(windows));
952 spec.set_fg(Some(Color::Green)).set_intense(true);
955 spec.set_fg(Some(Color::Cyan)).set_intense(true);
958 Cancelled => unreachable!(),
963 pub fn to_str(self) -> &'static str {
965 Bug => "error: internal compiler error",
966 Fatal | Error => "error",
967 Warning => "warning",
970 FailureNote => "failure-note",
971 Cancelled => panic!("Shouldn't call on cancelled error"),
975 pub fn is_failure_note(&self) -> bool {
984 macro_rules! pluralize {
986 if $x != 1 { "s" } else { "" }
990 // Useful type to use with `Result<>` indicate that an error has already
991 // been reported to the user, so no need to continue checking.
992 #[derive(Clone, Copy, Debug, RustcEncodable, RustcDecodable, Hash, PartialEq, Eq)]
993 pub struct ErrorReported;
995 rustc_data_structures::impl_stable_hash_via_hash!(ErrorReported);