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/")]
7 #![feature(crate_visibility_modifier)]
8 #![cfg_attr(unix, feature(libc))]
10 #![feature(optin_builtin_traits)]
12 pub use emitter::ColorConfig;
16 use emitter::{Emitter, EmitterWriter, is_case_difference};
17 use registry::Registry;
18 use rustc_data_structures::sync::{self, Lrc, Lock};
19 use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
20 use rustc_data_structures::stable_hasher::StableHasher;
21 use syntax_pos::source_map::SourceMap;
22 use syntax_pos::{Loc, Span, MultiSpan};
26 use std::{error, fmt};
30 use termcolor::{ColorSpec, Color};
33 mod diagnostic_builder;
35 pub mod annotate_snippet_emitter_writer;
41 pub type PResult<'a, T> = Result<T, DiagnosticBuilder<'a>>;
43 // `PResult` is used a lot. Make sure it doesn't unintentionally get bigger.
44 // (See also the comment on `DiagnosticBuilderInner`.)
45 #[cfg(target_arch = "x86_64")]
46 rustc_data_structures::static_assert_size!(PResult<'_, bool>, 16);
48 /// Indicates the confidence in the correctness of a suggestion.
50 /// All suggestions are marked with an `Applicability`. Tools use the applicability of a suggestion
51 /// to determine whether it should be automatically applied or if the user should be consulted
52 /// before applying the suggestion.
53 #[derive(Copy, Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
54 pub enum Applicability {
55 /// The suggestion is definitely what the user intended. This suggestion should be
56 /// automatically applied.
59 /// The suggestion may be what the user intended, but it is uncertain. The suggestion should
60 /// result in valid Rust code if it is applied.
63 /// The suggestion contains placeholders like `(...)` or `{ /* fields */ }`. The suggestion
64 /// cannot be applied automatically because it will not result in valid Rust code. The user
65 /// will need to fill in the placeholders.
68 /// The applicability of the suggestion is unknown.
72 #[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, RustcEncodable, RustcDecodable)]
73 pub enum SuggestionStyle {
74 /// Hide the suggested code when displaying this suggestion inline.
76 /// Always hide the suggested code but display the message.
78 /// Do not display this suggestion in the cli output, it is only meant for tools.
80 /// Always show the suggested code.
81 /// This will *not* show the code if the suggestion is inline *and* the suggested code is
84 /// Always show the suggested code independently.
88 impl SuggestionStyle {
89 fn hide_inline(&self) -> bool {
91 SuggestionStyle::ShowCode => false,
97 #[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
98 pub struct CodeSuggestion {
99 /// Each substitute can have multiple variants due to multiple
100 /// applicable suggestions
102 /// `foo.bar` might be replaced with `a.b` or `x.y` by replacing
103 /// `foo` and `bar` on their own:
107 /// Substitution { parts: vec![(0..3, "a"), (4..7, "b")] },
108 /// Substitution { parts: vec![(0..3, "x"), (4..7, "y")] },
112 /// or by replacing the entire span:
116 /// Substitution { parts: vec![(0..7, "a.b")] },
117 /// Substitution { parts: vec![(0..7, "x.y")] },
120 pub substitutions: Vec<Substitution>,
122 /// Visual representation of this suggestion.
123 pub style: SuggestionStyle,
124 /// Whether or not the suggestion is approximate
126 /// Sometimes we may show suggestions with placeholders,
127 /// which are useful for users but not useful for
128 /// tools like rustfix
129 pub applicability: Applicability,
132 #[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
133 /// See the docs on `CodeSuggestion::substitutions`
134 pub struct Substitution {
135 pub parts: Vec<SubstitutionPart>,
138 #[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
139 pub struct SubstitutionPart {
144 impl CodeSuggestion {
145 /// Returns the assembled code suggestions, whether they should be shown with an underline
146 /// and whether the substitution only differs in capitalization.
150 ) -> Vec<(String, Vec<SubstitutionPart>, bool)> {
151 use syntax_pos::{CharPos, Pos};
153 fn push_trailing(buf: &mut String,
154 line_opt: Option<&Cow<'_, str>>,
156 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());
175 self.substitutions.iter().cloned().map(|mut substitution| {
176 // Assumption: all spans are in the same file, and all spans
177 // are disjoint. Sort in ascending order.
178 substitution.parts.sort_by_key(|part| part.span.lo());
180 // Find the bounding span.
181 let lo = substitution.parts.iter().map(|part| part.span.lo()).min().unwrap();
182 let hi = substitution.parts.iter().map(|part| part.span.hi()).min().unwrap();
183 let bounding_span = Span::with_root_ctxt(lo, hi);
184 let lines = cm.span_to_lines(bounding_span).unwrap();
185 assert!(!lines.lines.is_empty());
187 // To build up the result, we do this for each span:
188 // - push the line segment trailing the previous span
189 // (at the beginning a "phantom" span pointing at the start of the line)
190 // - push lines between the previous and current span (if any)
191 // - if the previous and current span are not on the same line
192 // push the line segment leading up to the current span
193 // - splice in the span substitution
195 // Finally push the trailing line segment of the last span
196 let fm = &lines.file;
197 let mut prev_hi = cm.lookup_char_pos(bounding_span.lo());
198 prev_hi.col = CharPos::from_usize(0);
200 let mut prev_line = fm.get_line(lines.lines[0].line_index);
201 let mut buf = String::new();
203 for part in &substitution.parts {
204 let cur_lo = cm.lookup_char_pos(part.span.lo());
205 if prev_hi.line == cur_lo.line {
206 push_trailing(&mut buf, prev_line.as_ref(), &prev_hi, Some(&cur_lo));
208 push_trailing(&mut buf, prev_line.as_ref(), &prev_hi, None);
209 // push lines between the previous and current span (if any)
210 for idx in prev_hi.line..(cur_lo.line - 1) {
211 if let Some(line) = fm.get_line(idx) {
212 buf.push_str(line.as_ref());
216 if let Some(cur_line) = fm.get_line(cur_lo.line - 1) {
217 let end = std::cmp::min(cur_line.len(), cur_lo.col.to_usize());
218 buf.push_str(&cur_line[..end]);
221 buf.push_str(&part.snippet);
222 prev_hi = cm.lookup_char_pos(part.span.hi());
223 prev_line = fm.get_line(prev_hi.line - 1);
225 let only_capitalization = is_case_difference(cm, &buf, bounding_span);
226 // if the replacement already ends with a newline, don't print the next line
227 if !buf.ends_with('\n') {
228 push_trailing(&mut buf, prev_line.as_ref(), &prev_hi, None);
230 // remove trailing newlines
231 while buf.ends_with('\n') {
234 (buf, substitution.parts, only_capitalization)
239 pub use syntax_pos::fatal_error::{FatalError, FatalErrorMarker};
241 /// Signifies that the compiler died with an explicit call to `.bug`
242 /// or `.span_bug` rather than a failed assertion, etc.
243 #[derive(Copy, Clone, Debug)]
244 pub struct ExplicitBug;
246 impl fmt::Display for ExplicitBug {
247 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
248 write!(f, "parser internal bug")
252 impl error::Error for ExplicitBug {
253 fn description(&self) -> &str {
254 "The parser has encountered an internal bug"
258 pub use diagnostic::{Diagnostic, SubDiagnostic, DiagnosticStyledString, DiagnosticId};
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 thread_local!(pub static TRACK_DIAGNOSTICS: Cell<fn(&Diagnostic)> =
313 Cell::new(default_track_diagnostic));
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,
334 impl Drop for HandlerInner {
336 self.emit_stashed_diagnostics();
338 if !self.has_errors() {
339 let bugs = std::mem::replace(&mut self.delayed_span_bugs, Vec::new());
340 let has_bugs = !bugs.is_empty();
342 self.emit_diagnostic(&bug);
345 panic!("no errors encountered even though `delay_span_bug` issued");
352 pub fn with_tty_emitter(
353 color_config: ColorConfig,
354 can_emit_warnings: bool,
355 treat_err_as_bug: Option<usize>,
356 cm: Option<Lrc<SourceMap>>,
358 Self::with_tty_emitter_and_flags(
364 .. Default::default()
369 pub fn with_tty_emitter_and_flags(
370 color_config: ColorConfig,
371 cm: Option<Lrc<SourceMap>>,
374 let emitter = Box::new(EmitterWriter::stderr(
380 flags.external_macro_backtrace,
382 Self::with_emitter_and_flags(emitter, flags)
386 can_emit_warnings: bool,
387 treat_err_as_bug: Option<usize>,
388 emitter: Box<dyn Emitter + sync::Send>,
390 Handler::with_emitter_and_flags(
395 .. Default::default()
400 pub fn with_emitter_and_flags(
401 emitter: Box<dyn Emitter + sync::Send>,
406 inner: Lock::new(HandlerInner {
409 deduplicated_err_count: 0,
411 continue_after_error: true,
412 delayed_span_bugs: Vec::new(),
413 taught_diagnostics: Default::default(),
414 emitted_diagnostic_codes: Default::default(),
415 emitted_diagnostics: Default::default(),
416 stashed_diagnostics: Default::default(),
421 pub fn set_continue_after_error(&self, continue_after_error: bool) {
422 self.inner.borrow_mut().continue_after_error = continue_after_error;
425 // This is here to not allow mutation of flags;
426 // as of this writing it's only used in tests in librustc.
427 pub fn can_emit_warnings(&self) -> bool {
428 self.flags.can_emit_warnings
431 /// Resets the diagnostic error count as well as the cached emitted diagnostics.
433 /// NOTE: *do not* call this function from rustc. It is only meant to be called from external
434 /// tools that want to reuse a `Parser` cleaning the previously emitted diagnostics as well as
435 /// the overall count of emitted error diagnostics.
436 pub fn reset_err_count(&self) {
437 let mut inner = self.inner.borrow_mut();
439 inner.deduplicated_err_count = 0;
441 // actually free the underlying memory (which `clear` would not do)
442 inner.delayed_span_bugs = Default::default();
443 inner.taught_diagnostics = Default::default();
444 inner.emitted_diagnostic_codes = Default::default();
445 inner.emitted_diagnostics = Default::default();
446 inner.stashed_diagnostics = Default::default();
449 /// Stash a given diagnostic with the given `Span` and `StashKey` as the key for later stealing.
450 /// If the diagnostic with this `(span, key)` already exists, this will result in an ICE.
451 pub fn stash_diagnostic(&self, span: Span, key: StashKey, diag: Diagnostic) {
452 let mut inner = self.inner.borrow_mut();
453 if let Some(mut old_diag) = inner.stashed_diagnostics.insert((span, key), diag) {
454 // We are removing a previously stashed diagnostic which should not happen.
455 old_diag.level = Bug;
456 old_diag.note(&format!(
457 "{}:{}: already existing stashed diagnostic with (span = {:?}, key = {:?})",
458 file!(), line!(), span, key
460 inner.emit_diag_at_span(old_diag, span);
465 /// Steal a previously stashed diagnostic with the given `Span` and `StashKey` as the key.
466 pub fn steal_diagnostic(&self, span: Span, key: StashKey) -> Option<DiagnosticBuilder<'_>> {
470 .remove(&(span, key))
471 .map(|diag| DiagnosticBuilder::new_diagnostic(self, diag))
474 /// Emit all stashed diagnostics.
475 pub fn emit_stashed_diagnostics(&self) {
476 self.inner.borrow_mut().emit_stashed_diagnostics();
479 /// Construct a dummy builder with `Level::Cancelled`.
481 /// Using this will neither report anything to the user (e.g. a warning),
482 /// nor will compilation cancel as a result.
483 pub fn struct_dummy(&self) -> DiagnosticBuilder<'_> {
484 DiagnosticBuilder::new(self, Level::Cancelled, "")
487 /// Construct a builder at the `Warning` level at the given `span` and with the `msg`.
488 pub fn struct_span_warn(&self, span: impl Into<MultiSpan>, msg: &str) -> DiagnosticBuilder<'_> {
489 let mut result = self.struct_warn(msg);
490 result.set_span(span);
494 /// Construct a builder at the `Warning` level at the given `span` and with the `msg`.
495 /// Also include a code.
496 pub fn struct_span_warn_with_code(
498 span: impl Into<MultiSpan>,
501 ) -> DiagnosticBuilder<'_> {
502 let mut result = self.struct_span_warn(span, msg);
507 /// Construct a builder at the `Warning` level with the `msg`.
508 pub fn struct_warn(&self, msg: &str) -> DiagnosticBuilder<'_> {
509 let mut result = DiagnosticBuilder::new(self, Level::Warning, msg);
510 if !self.flags.can_emit_warnings {
516 /// Construct a builder at the `Error` level at the given `span` and with the `msg`.
517 pub fn struct_span_err(&self, span: impl Into<MultiSpan>, msg: &str) -> DiagnosticBuilder<'_> {
518 let mut result = self.struct_err(msg);
519 result.set_span(span);
523 /// Construct a builder at the `Error` level at the given `span`, with the `msg`, and `code`.
524 pub fn struct_span_err_with_code(
526 span: impl Into<MultiSpan>,
529 ) -> DiagnosticBuilder<'_> {
530 let mut result = self.struct_span_err(span, msg);
535 /// Construct a builder at the `Error` level with the `msg`.
536 // FIXME: This method should be removed (every error should have an associated error code).
537 pub fn struct_err(&self, msg: &str) -> DiagnosticBuilder<'_> {
538 DiagnosticBuilder::new(self, Level::Error, msg)
541 /// Construct a builder at the `Error` level with the `msg` and the `code`.
542 pub fn struct_err_with_code(&self, msg: &str, code: DiagnosticId) -> DiagnosticBuilder<'_> {
543 let mut result = self.struct_err(msg);
548 /// Construct a builder at the `Fatal` level at the given `span` and with the `msg`.
549 pub fn struct_span_fatal(
551 span: impl Into<MultiSpan>,
553 ) -> DiagnosticBuilder<'_> {
554 let mut result = self.struct_fatal(msg);
555 result.set_span(span);
559 /// Construct a builder at the `Fatal` level at the given `span`, with the `msg`, and `code`.
560 pub fn struct_span_fatal_with_code(
562 span: impl Into<MultiSpan>,
565 ) -> DiagnosticBuilder<'_> {
566 let mut result = self.struct_span_fatal(span, msg);
571 /// Construct a builder at the `Error` level with the `msg`.
572 pub fn struct_fatal(&self, msg: &str) -> DiagnosticBuilder<'_> {
573 DiagnosticBuilder::new(self, Level::Fatal, msg)
576 pub fn span_fatal(&self, span: impl Into<MultiSpan>, msg: &str) -> FatalError {
577 self.emit_diag_at_span(Diagnostic::new(Fatal, msg), span);
581 pub fn span_fatal_with_code(
583 span: impl Into<MultiSpan>,
587 self.emit_diag_at_span(Diagnostic::new_with_code(Fatal, Some(code), msg), span);
591 pub fn span_err(&self, span: impl Into<MultiSpan>, msg: &str) {
592 self.emit_diag_at_span(Diagnostic::new(Error, msg), span);
595 pub fn span_err_with_code(&self, span: impl Into<MultiSpan>, msg: &str, code: DiagnosticId) {
596 self.emit_diag_at_span(Diagnostic::new_with_code(Error, Some(code), msg), span);
599 pub fn span_warn(&self, span: impl Into<MultiSpan>, msg: &str) {
600 self.emit_diag_at_span(Diagnostic::new(Warning, msg), span);
603 pub fn span_warn_with_code(&self, span: impl Into<MultiSpan>, msg: &str, code: DiagnosticId) {
604 self.emit_diag_at_span(Diagnostic::new_with_code(Warning, Some(code), msg), span);
607 pub fn span_bug(&self, span: impl Into<MultiSpan>, msg: &str) -> ! {
608 self.inner.borrow_mut().span_bug(span, msg)
611 pub fn delay_span_bug(&self, span: impl Into<MultiSpan>, msg: &str) {
612 self.inner.borrow_mut().delay_span_bug(span, msg)
615 pub fn span_bug_no_panic(&self, span: impl Into<MultiSpan>, msg: &str) {
616 self.emit_diag_at_span(Diagnostic::new(Bug, msg), span);
619 pub fn span_note_without_error(&self, span: impl Into<MultiSpan>, msg: &str) {
620 self.emit_diag_at_span(Diagnostic::new(Note, msg), span);
623 pub fn span_note_diag(&self, span: Span, msg: &str) -> DiagnosticBuilder<'_> {
624 let mut db = DiagnosticBuilder::new(self, Note, msg);
629 pub fn failure(&self, msg: &str) {
630 self.inner.borrow_mut().failure(msg);
633 pub fn fatal(&self, msg: &str) -> FatalError {
634 self.inner.borrow_mut().fatal(msg)
637 pub fn err(&self, msg: &str) {
638 self.inner.borrow_mut().err(msg);
641 pub fn warn(&self, msg: &str) {
642 let mut db = DiagnosticBuilder::new(self, Warning, msg);
646 pub fn note_without_error(&self, msg: &str) {
647 DiagnosticBuilder::new(self, Note, msg).emit();
650 pub fn bug(&self, msg: &str) -> ! {
651 self.inner.borrow_mut().bug(msg)
654 pub fn err_count(&self) -> usize {
655 self.inner.borrow().err_count()
658 pub fn has_errors(&self) -> bool {
659 self.inner.borrow().has_errors()
661 pub fn has_errors_or_delayed_span_bugs(&self) -> bool {
662 self.inner.borrow().has_errors_or_delayed_span_bugs()
665 pub fn print_error_count(&self, registry: &Registry) {
666 self.inner.borrow_mut().print_error_count(registry)
669 pub fn abort_if_errors(&self) {
670 self.inner.borrow_mut().abort_if_errors()
673 pub fn abort_if_errors_and_should_abort(&self) {
674 self.inner.borrow_mut().abort_if_errors_and_should_abort()
677 /// `true` if we haven't taught a diagnostic with this code already.
678 /// The caller must then teach the user about such a diagnostic.
680 /// Used to suppress emitting the same error multiple times with extended explanation when
681 /// calling `-Zteach`.
682 pub fn must_teach(&self, code: &DiagnosticId) -> bool {
683 self.inner.borrow_mut().must_teach(code)
686 pub fn force_print_diagnostic(&self, db: Diagnostic) {
687 self.inner.borrow_mut().force_print_diagnostic(db)
690 pub fn emit_diagnostic(&self, diagnostic: &Diagnostic) {
691 self.inner.borrow_mut().emit_diagnostic(diagnostic)
694 fn emit_diag_at_span(&self, mut diag: Diagnostic, sp: impl Into<MultiSpan>) {
695 let mut inner = self.inner.borrow_mut();
696 inner.emit_diagnostic(diag.set_span(sp));
697 inner.abort_if_errors_and_should_abort();
700 pub fn emit_artifact_notification(&self, path: &Path, artifact_type: &str) {
701 self.inner.borrow_mut().emit_artifact_notification(path, artifact_type)
704 pub fn delay_as_bug(&self, diagnostic: Diagnostic) {
705 self.inner.borrow_mut().delay_as_bug(diagnostic)
710 fn must_teach(&mut self, code: &DiagnosticId) -> bool {
711 self.taught_diagnostics.insert(code.clone())
714 fn force_print_diagnostic(&mut self, db: Diagnostic) {
715 self.emitter.emit_diagnostic(&db);
718 /// Emit all stashed diagnostics.
719 fn emit_stashed_diagnostics(&mut self) {
720 let diags = self.stashed_diagnostics.drain(..).map(|x| x.1).collect::<Vec<_>>();
721 diags.iter().for_each(|diag| self.emit_diagnostic(diag));
724 fn emit_diagnostic(&mut self, diagnostic: &Diagnostic) {
725 if diagnostic.cancelled() {
729 if diagnostic.level == Warning && !self.flags.can_emit_warnings {
733 TRACK_DIAGNOSTICS.with(|track_diagnostics| {
734 track_diagnostics.get()(diagnostic);
737 if let Some(ref code) = diagnostic.code {
738 self.emitted_diagnostic_codes.insert(code.clone());
741 let diagnostic_hash = {
743 let mut hasher = StableHasher::new();
744 diagnostic.hash(&mut hasher);
748 // Only emit the diagnostic if we haven't already emitted an equivalent
750 if self.emitted_diagnostics.insert(diagnostic_hash) {
751 self.emitter.emit_diagnostic(diagnostic);
752 if diagnostic.is_error() {
753 self.deduplicated_err_count += 1;
756 if diagnostic.is_error() {
757 self.bump_err_count();
761 fn emit_artifact_notification(&mut self, path: &Path, artifact_type: &str) {
762 self.emitter.emit_artifact_notification(path, artifact_type);
765 fn treat_err_as_bug(&self) -> bool {
766 self.flags.treat_err_as_bug.map(|c| self.err_count() >= c).unwrap_or(false)
769 fn print_error_count(&mut self, registry: &Registry) {
770 self.emit_stashed_diagnostics();
772 let s = match self.deduplicated_err_count {
774 1 => "aborting due to previous error".to_string(),
775 count => format!("aborting due to {} previous errors", count)
777 if self.treat_err_as_bug() {
781 let _ = self.fatal(&s);
783 let can_show_explain = self.emitter.should_show_explain();
784 let are_there_diagnostics = !self.emitted_diagnostic_codes.is_empty();
785 if can_show_explain && are_there_diagnostics {
786 let mut error_codes = self
787 .emitted_diagnostic_codes
789 .filter_map(|x| match &x {
790 DiagnosticId::Error(s) if registry.find_description(s).is_some() => {
795 .collect::<Vec<_>>();
796 if !error_codes.is_empty() {
798 if error_codes.len() > 1 {
799 let limit = if error_codes.len() > 9 { 9 } else { error_codes.len() };
800 self.failure(&format!("Some errors have detailed explanations: {}{}",
801 error_codes[..limit].join(", "),
802 if error_codes.len() > 9 { "..." } else { "." }));
803 self.failure(&format!("For more information about an error, try \
804 `rustc --explain {}`.",
807 self.failure(&format!("For more information about this error, try \
808 `rustc --explain {}`.",
815 fn err_count(&self) -> usize {
816 self.err_count + self.stashed_diagnostics.len()
819 fn has_errors(&self) -> bool {
822 fn has_errors_or_delayed_span_bugs(&self) -> bool {
823 self.has_errors() || !self.delayed_span_bugs.is_empty()
826 fn abort_if_errors_and_should_abort(&mut self) {
827 self.emit_stashed_diagnostics();
829 if self.has_errors() && !self.continue_after_error {
834 fn abort_if_errors(&mut self) {
835 self.emit_stashed_diagnostics();
837 if self.has_errors() {
842 fn span_bug(&mut self, sp: impl Into<MultiSpan>, msg: &str) -> ! {
843 self.emit_diag_at_span(Diagnostic::new(Bug, msg), sp);
847 fn emit_diag_at_span(&mut self, mut diag: Diagnostic, sp: impl Into<MultiSpan>) {
848 self.emit_diagnostic(diag.set_span(sp));
849 self.abort_if_errors_and_should_abort();
852 fn delay_span_bug(&mut self, sp: impl Into<MultiSpan>, msg: &str) {
853 if self.treat_err_as_bug() {
854 // FIXME: don't abort here if report_delayed_bugs is off
855 self.span_bug(sp, msg);
857 let mut diagnostic = Diagnostic::new(Level::Bug, msg);
858 diagnostic.set_span(sp.into());
859 self.delay_as_bug(diagnostic)
862 fn failure(&mut self, msg: &str) {
863 self.emit_diagnostic(&Diagnostic::new(FailureNote, msg));
866 fn fatal(&mut self, msg: &str) -> FatalError {
867 self.emit_error(Fatal, msg);
871 fn err(&mut self, msg: &str) {
872 self.emit_error(Error, msg);
875 /// Emit an error; level should be `Error` or `Fatal`.
876 fn emit_error(&mut self, level: Level, msg: &str,) {
877 if self.treat_err_as_bug() {
880 self.emit_diagnostic(&Diagnostic::new(level, msg));
883 fn bug(&mut self, msg: &str) -> ! {
884 self.emit_diagnostic(&Diagnostic::new(Bug, msg));
888 fn delay_as_bug(&mut self, diagnostic: Diagnostic) {
889 if self.flags.report_delayed_bugs {
890 self.emit_diagnostic(&diagnostic);
892 self.delayed_span_bugs.push(diagnostic);
895 fn bump_err_count(&mut self) {
897 self.panic_if_treat_err_as_bug();
900 fn panic_if_treat_err_as_bug(&self) {
901 if self.treat_err_as_bug() {
902 let s = match (self.err_count(), self.flags.treat_err_as_bug.unwrap_or(0)) {
904 (1, 1) => "aborting due to `-Z treat-err-as-bug=1`".to_string(),
908 "aborting after {} errors due to `-Z treat-err-as-bug={}`",
919 #[derive(Copy, PartialEq, Clone, Hash, Debug, RustcEncodable, RustcDecodable)]
931 impl fmt::Display for Level {
932 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
938 fn color(self) -> ColorSpec {
939 let mut spec = ColorSpec::new();
941 Bug | Fatal | Error => {
942 spec.set_fg(Some(Color::Red))
946 spec.set_fg(Some(Color::Yellow))
947 .set_intense(cfg!(windows));
950 spec.set_fg(Some(Color::Green))
954 spec.set_fg(Some(Color::Cyan))
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 { "" }