1315 lines
46 KiB
Rust
1315 lines
46 KiB
Rust
//! Diagnostics creation and emission for `rustc`.
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//!
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//! This module contains the code for creating and emitting diagnostics.
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#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
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#![feature(crate_visibility_modifier)]
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#![feature(backtrace)]
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#![feature(if_let_guard)]
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#![feature(format_args_capture)]
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#![feature(iter_zip)]
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#![feature(nll)]
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#[macro_use]
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extern crate rustc_macros;
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pub use emitter::ColorConfig;
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use tracing::debug;
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use Level::*;
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use emitter::{is_case_difference, Emitter, EmitterWriter};
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use registry::Registry;
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use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
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use rustc_data_structures::stable_hasher::StableHasher;
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use rustc_data_structures::sync::{self, Lock, Lrc};
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use rustc_data_structures::AtomicRef;
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pub use rustc_lint_defs::{pluralize, Applicability};
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use rustc_serialize::json::Json;
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use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
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use rustc_span::source_map::SourceMap;
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use rustc_span::{Loc, MultiSpan, Span};
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use std::borrow::Cow;
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use std::hash::{Hash, Hasher};
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use std::num::NonZeroUsize;
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use std::panic;
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use std::path::Path;
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use std::{error, fmt};
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use termcolor::{Color, ColorSpec};
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pub mod annotate_snippet_emitter_writer;
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mod diagnostic;
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mod diagnostic_builder;
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pub mod emitter;
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pub mod json;
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mod lock;
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pub mod registry;
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mod snippet;
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mod styled_buffer;
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pub use snippet::Style;
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pub type PResult<'a, T> = Result<T, DiagnosticBuilder<'a>>;
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// `PResult` is used a lot. Make sure it doesn't unintentionally get bigger.
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// (See also the comment on `DiagnosticBuilderInner`.)
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#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
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rustc_data_structures::static_assert_size!(PResult<'_, bool>, 16);
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#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash, Encodable, Decodable)]
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pub enum SuggestionStyle {
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/// Hide the suggested code when displaying this suggestion inline.
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HideCodeInline,
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/// Always hide the suggested code but display the message.
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HideCodeAlways,
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/// Do not display this suggestion in the cli output, it is only meant for tools.
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CompletelyHidden,
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/// Always show the suggested code.
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/// This will *not* show the code if the suggestion is inline *and* the suggested code is
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/// empty.
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ShowCode,
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/// Always show the suggested code independently.
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ShowAlways,
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}
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impl SuggestionStyle {
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fn hide_inline(&self) -> bool {
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!matches!(*self, SuggestionStyle::ShowCode)
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}
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}
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#[derive(Clone, Debug, PartialEq, Default)]
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pub struct ToolMetadata(pub Option<Json>);
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impl ToolMetadata {
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fn new(json: Json) -> Self {
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ToolMetadata(Some(json))
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}
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fn is_set(&self) -> bool {
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self.0.is_some()
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}
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}
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impl Hash for ToolMetadata {
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fn hash<H: Hasher>(&self, _state: &mut H) {}
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}
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// Doesn't really need to round-trip
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impl<D: Decoder> Decodable<D> for ToolMetadata {
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fn decode(_d: &mut D) -> Result<Self, D::Error> {
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Ok(ToolMetadata(None))
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}
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}
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impl<S: Encoder> Encodable<S> for ToolMetadata {
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fn encode(&self, e: &mut S) -> Result<(), S::Error> {
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match &self.0 {
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None => e.emit_unit(),
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Some(json) => json.encode(e),
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}
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}
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}
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#[derive(Clone, Debug, PartialEq, Hash, Encodable, Decodable)]
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pub struct CodeSuggestion {
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/// Each substitute can have multiple variants due to multiple
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/// applicable suggestions
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///
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/// `foo.bar` might be replaced with `a.b` or `x.y` by replacing
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/// `foo` and `bar` on their own:
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///
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/// ```
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/// vec![
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/// Substitution { parts: vec![(0..3, "a"), (4..7, "b")] },
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/// Substitution { parts: vec![(0..3, "x"), (4..7, "y")] },
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/// ]
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/// ```
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///
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/// or by replacing the entire span:
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///
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/// ```
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/// vec![
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/// Substitution { parts: vec![(0..7, "a.b")] },
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/// Substitution { parts: vec![(0..7, "x.y")] },
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/// ]
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/// ```
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pub substitutions: Vec<Substitution>,
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pub msg: String,
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/// Visual representation of this suggestion.
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pub style: SuggestionStyle,
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/// Whether or not the suggestion is approximate
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///
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/// Sometimes we may show suggestions with placeholders,
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/// which are useful for users but not useful for
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/// tools like rustfix
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pub applicability: Applicability,
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/// Tool-specific metadata
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pub tool_metadata: ToolMetadata,
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}
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#[derive(Clone, Debug, PartialEq, Hash, Encodable, Decodable)]
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/// See the docs on `CodeSuggestion::substitutions`
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pub struct Substitution {
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pub parts: Vec<SubstitutionPart>,
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}
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#[derive(Clone, Debug, PartialEq, Hash, Encodable, Decodable)]
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pub struct SubstitutionPart {
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pub span: Span,
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pub snippet: String,
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}
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/// Used to translate between `Span`s and byte positions within a single output line in highlighted
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/// code of structured suggestions.
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#[derive(Debug, Clone, Copy)]
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pub struct SubstitutionHighlight {
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start: usize,
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end: usize,
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}
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impl SubstitutionPart {
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pub fn is_addition(&self, sm: &SourceMap) -> bool {
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!self.snippet.is_empty()
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&& sm
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.span_to_snippet(self.span)
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.map_or(self.span.is_empty(), |snippet| snippet.trim().is_empty())
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}
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pub fn is_deletion(&self) -> bool {
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self.snippet.trim().is_empty()
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}
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pub fn is_replacement(&self, sm: &SourceMap) -> bool {
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!self.snippet.is_empty()
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&& sm
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.span_to_snippet(self.span)
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.map_or(!self.span.is_empty(), |snippet| !snippet.trim().is_empty())
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}
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}
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impl CodeSuggestion {
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/// Returns the assembled code suggestions, whether they should be shown with an underline
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/// and whether the substitution only differs in capitalization.
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pub fn splice_lines(
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&self,
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sm: &SourceMap,
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) -> Vec<(String, Vec<SubstitutionPart>, Vec<Vec<SubstitutionHighlight>>, bool)> {
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// For the `Vec<Vec<SubstitutionHighlight>>` value, the first level of the vector
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// corresponds to the output snippet's lines, while the second level corresponds to the
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// substrings within that line that should be highlighted.
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use rustc_span::{CharPos, Pos};
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/// Append to a buffer the remainder of the line of existing source code, and return the
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/// count of lines that have been added for accurate highlighting.
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fn push_trailing(
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buf: &mut String,
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line_opt: Option<&Cow<'_, str>>,
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lo: &Loc,
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hi_opt: Option<&Loc>,
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) -> usize {
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let mut line_count = 0;
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let (lo, hi_opt) = (lo.col.to_usize(), hi_opt.map(|hi| hi.col.to_usize()));
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if let Some(line) = line_opt {
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if let Some(lo) = line.char_indices().map(|(i, _)| i).nth(lo) {
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let hi_opt = hi_opt.and_then(|hi| line.char_indices().map(|(i, _)| i).nth(hi));
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match hi_opt {
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Some(hi) if hi > lo => {
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line_count = line[lo..hi].matches('\n').count();
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buf.push_str(&line[lo..hi])
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}
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Some(_) => (),
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None => {
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line_count = line[lo..].matches('\n').count();
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buf.push_str(&line[lo..])
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}
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}
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}
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if hi_opt.is_none() {
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buf.push('\n');
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}
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}
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line_count
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}
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assert!(!self.substitutions.is_empty());
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self.substitutions
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.iter()
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.filter(|subst| {
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// Suggestions coming from macros can have malformed spans. This is a heavy
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// handed approach to avoid ICEs by ignoring the suggestion outright.
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let invalid = subst.parts.iter().any(|item| sm.is_valid_span(item.span).is_err());
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if invalid {
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debug!("splice_lines: suggestion contains an invalid span: {:?}", subst);
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}
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!invalid
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})
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.cloned()
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.filter_map(|mut substitution| {
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// Assumption: all spans are in the same file, and all spans
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// are disjoint. Sort in ascending order.
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substitution.parts.sort_by_key(|part| part.span.lo());
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// Find the bounding span.
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let lo = substitution.parts.iter().map(|part| part.span.lo()).min()?;
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let hi = substitution.parts.iter().map(|part| part.span.hi()).max()?;
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let bounding_span = Span::with_root_ctxt(lo, hi);
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// The different spans might belong to different contexts, if so ignore suggestion.
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let lines = sm.span_to_lines(bounding_span).ok()?;
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assert!(!lines.lines.is_empty() || bounding_span.is_dummy());
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// We can't splice anything if the source is unavailable.
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if !sm.ensure_source_file_source_present(lines.file.clone()) {
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return None;
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}
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let mut highlights = vec![];
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// To build up the result, we do this for each span:
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// - push the line segment trailing the previous span
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// (at the beginning a "phantom" span pointing at the start of the line)
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// - push lines between the previous and current span (if any)
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// - if the previous and current span are not on the same line
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// push the line segment leading up to the current span
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// - splice in the span substitution
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//
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// Finally push the trailing line segment of the last span
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let sf = &lines.file;
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let mut prev_hi = sm.lookup_char_pos(bounding_span.lo());
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prev_hi.col = CharPos::from_usize(0);
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let mut prev_line =
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lines.lines.get(0).and_then(|line0| sf.get_line(line0.line_index));
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let mut buf = String::new();
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let mut line_highlight = vec![];
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// We need to keep track of the difference between the existing code and the added
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// or deleted code in order to point at the correct column *after* substitution.
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let mut acc = 0;
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for part in &substitution.parts {
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let cur_lo = sm.lookup_char_pos(part.span.lo());
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if prev_hi.line == cur_lo.line {
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let mut count =
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push_trailing(&mut buf, prev_line.as_ref(), &prev_hi, Some(&cur_lo));
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while count > 0 {
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highlights.push(std::mem::take(&mut line_highlight));
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acc = 0;
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count -= 1;
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}
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} else {
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acc = 0;
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highlights.push(std::mem::take(&mut line_highlight));
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let mut count = push_trailing(&mut buf, prev_line.as_ref(), &prev_hi, None);
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while count > 0 {
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highlights.push(std::mem::take(&mut line_highlight));
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count -= 1;
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}
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// push lines between the previous and current span (if any)
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for idx in prev_hi.line..(cur_lo.line - 1) {
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if let Some(line) = sf.get_line(idx) {
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buf.push_str(line.as_ref());
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buf.push('\n');
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highlights.push(std::mem::take(&mut line_highlight));
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}
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}
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if let Some(cur_line) = sf.get_line(cur_lo.line - 1) {
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let end = match cur_line.char_indices().nth(cur_lo.col.to_usize()) {
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Some((i, _)) => i,
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None => cur_line.len(),
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};
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buf.push_str(&cur_line[..end]);
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}
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}
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// Add a whole line highlight per line in the snippet.
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let len: isize = part
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.snippet
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.split('\n')
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.next()
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.unwrap_or(&part.snippet)
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.chars()
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.map(|c| match c {
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'\t' => 4,
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_ => 1,
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})
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.sum();
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line_highlight.push(SubstitutionHighlight {
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start: (cur_lo.col.0 as isize + acc) as usize,
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end: (cur_lo.col.0 as isize + acc + len) as usize,
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});
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buf.push_str(&part.snippet);
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let cur_hi = sm.lookup_char_pos(part.span.hi());
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if prev_hi.line == cur_lo.line {
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// Account for the difference between the width of the current code and the
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// snippet being suggested, so that the *later* suggestions are correctly
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// aligned on the screen.
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acc += len as isize - (cur_hi.col.0 - cur_lo.col.0) as isize;
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}
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prev_hi = cur_hi;
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prev_line = sf.get_line(prev_hi.line - 1);
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for line in part.snippet.split('\n').skip(1) {
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acc = 0;
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highlights.push(std::mem::take(&mut line_highlight));
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let end: usize = line
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.chars()
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.map(|c| match c {
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'\t' => 4,
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_ => 1,
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})
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.sum();
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line_highlight.push(SubstitutionHighlight { start: 0, end });
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}
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}
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highlights.push(std::mem::take(&mut line_highlight));
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let only_capitalization = is_case_difference(sm, &buf, bounding_span);
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// if the replacement already ends with a newline, don't print the next line
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if !buf.ends_with('\n') {
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push_trailing(&mut buf, prev_line.as_ref(), &prev_hi, None);
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}
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// remove trailing newlines
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while buf.ends_with('\n') {
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buf.pop();
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}
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Some((buf, substitution.parts, highlights, only_capitalization))
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})
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.collect()
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}
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}
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pub use rustc_span::fatal_error::{FatalError, FatalErrorMarker};
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/// Signifies that the compiler died with an explicit call to `.bug`
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/// or `.span_bug` rather than a failed assertion, etc.
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#[derive(Copy, Clone, Debug)]
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pub struct ExplicitBug;
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impl fmt::Display for ExplicitBug {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "parser internal bug")
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}
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}
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impl error::Error for ExplicitBug {}
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pub use diagnostic::{Diagnostic, DiagnosticId, DiagnosticStyledString, SubDiagnostic};
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pub use diagnostic_builder::DiagnosticBuilder;
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use std::backtrace::Backtrace;
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/// A handler deals with errors and other compiler output.
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/// Certain errors (fatal, bug, unimpl) may cause immediate exit,
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/// others log errors for later reporting.
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pub struct Handler {
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flags: HandlerFlags,
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inner: Lock<HandlerInner>,
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}
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/// This inner struct exists to keep it all behind a single lock;
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/// this is done to prevent possible deadlocks in a multi-threaded compiler,
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/// as well as inconsistent state observation.
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struct HandlerInner {
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flags: HandlerFlags,
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/// The number of errors that have been emitted, including duplicates.
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///
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/// This is not necessarily the count that's reported to the user once
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/// compilation ends.
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err_count: usize,
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warn_count: usize,
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deduplicated_err_count: usize,
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emitter: Box<dyn Emitter + sync::Send>,
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delayed_span_bugs: Vec<Diagnostic>,
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delayed_good_path_bugs: Vec<DelayedDiagnostic>,
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/// This set contains the `DiagnosticId` of all emitted diagnostics to avoid
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/// emitting the same diagnostic with extended help (`--teach`) twice, which
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/// would be unnecessary repetition.
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taught_diagnostics: FxHashSet<DiagnosticId>,
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/// Used to suggest rustc --explain <error code>
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emitted_diagnostic_codes: FxHashSet<DiagnosticId>,
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/// This set contains a hash of every diagnostic that has been emitted by
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/// this handler. These hashes is used to avoid emitting the same error
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/// twice.
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emitted_diagnostics: FxHashSet<u128>,
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/// Stashed diagnostics emitted in one stage of the compiler that may be
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/// stolen by other stages (e.g. to improve them and add more information).
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/// The stashed diagnostics count towards the total error count.
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/// When `.abort_if_errors()` is called, these are also emitted.
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stashed_diagnostics: FxIndexMap<(Span, StashKey), Diagnostic>,
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/// The warning count, used for a recap upon finishing
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deduplicated_warn_count: usize,
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future_breakage_diagnostics: Vec<Diagnostic>,
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/// If set to `true`, no warning or error will be emitted.
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quiet: bool,
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}
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|
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/// A key denoting where from a diagnostic was stashed.
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#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
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pub enum StashKey {
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ItemNoType,
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}
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|
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fn default_track_diagnostic(_: &Diagnostic) {}
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|
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pub static TRACK_DIAGNOSTICS: AtomicRef<fn(&Diagnostic)> =
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AtomicRef::new(&(default_track_diagnostic as fn(&_)));
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|
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#[derive(Copy, Clone, Default)]
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pub struct HandlerFlags {
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/// If false, warning-level lints are suppressed.
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/// (rustc: see `--allow warnings` and `--cap-lints`)
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pub can_emit_warnings: bool,
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/// If true, error-level diagnostics are 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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/// If true, immediately emit diagnostics that would otherwise be buffered.
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/// (rustc: see `-Z dont-buffer-diagnostics` and `-Z treat-err-as-bug`)
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pub dont_buffer_diagnostics: bool,
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/// If true, immediately print bugs registered with `delay_span_bug`.
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/// (rustc: see `-Z report-delayed-bugs`)
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pub report_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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/// If true, identical diagnostics are reported only once.
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pub deduplicate_diagnostics: bool,
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}
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|
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impl Drop for HandlerInner {
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fn drop(&mut self) {
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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.delayed_span_bugs, Vec::new());
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|
self.flush_delayed(bugs, "no errors encountered even though `delay_span_bug` issued");
|
|
}
|
|
|
|
if !self.has_any_message() {
|
|
let bugs = std::mem::replace(&mut self.delayed_good_path_bugs, Vec::new());
|
|
self.flush_delayed(
|
|
bugs.into_iter().map(DelayedDiagnostic::decorate).collect(),
|
|
"no warnings or errors encountered even though `delayed_good_path_bugs` issued",
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Handler {
|
|
pub fn with_tty_emitter(
|
|
color_config: ColorConfig,
|
|
can_emit_warnings: bool,
|
|
treat_err_as_bug: Option<NonZeroUsize>,
|
|
sm: Option<Lrc<SourceMap>>,
|
|
) -> Self {
|
|
Self::with_tty_emitter_and_flags(
|
|
color_config,
|
|
sm,
|
|
HandlerFlags { can_emit_warnings, treat_err_as_bug, ..Default::default() },
|
|
)
|
|
}
|
|
|
|
pub fn with_tty_emitter_and_flags(
|
|
color_config: ColorConfig,
|
|
sm: Option<Lrc<SourceMap>>,
|
|
flags: HandlerFlags,
|
|
) -> Self {
|
|
let emitter = Box::new(EmitterWriter::stderr(
|
|
color_config,
|
|
sm,
|
|
false,
|
|
false,
|
|
None,
|
|
flags.macro_backtrace,
|
|
));
|
|
Self::with_emitter_and_flags(emitter, flags)
|
|
}
|
|
|
|
pub fn with_emitter(
|
|
can_emit_warnings: bool,
|
|
treat_err_as_bug: Option<NonZeroUsize>,
|
|
emitter: Box<dyn Emitter + sync::Send>,
|
|
) -> Self {
|
|
Handler::with_emitter_and_flags(
|
|
emitter,
|
|
HandlerFlags { can_emit_warnings, treat_err_as_bug, ..Default::default() },
|
|
)
|
|
}
|
|
|
|
pub fn with_emitter_and_flags(
|
|
emitter: Box<dyn Emitter + sync::Send>,
|
|
flags: HandlerFlags,
|
|
) -> Self {
|
|
Self {
|
|
flags,
|
|
inner: Lock::new(HandlerInner {
|
|
flags,
|
|
err_count: 0,
|
|
warn_count: 0,
|
|
deduplicated_err_count: 0,
|
|
deduplicated_warn_count: 0,
|
|
emitter,
|
|
delayed_span_bugs: Vec::new(),
|
|
delayed_good_path_bugs: Vec::new(),
|
|
taught_diagnostics: Default::default(),
|
|
emitted_diagnostic_codes: Default::default(),
|
|
emitted_diagnostics: Default::default(),
|
|
stashed_diagnostics: Default::default(),
|
|
future_breakage_diagnostics: Vec::new(),
|
|
quiet: false,
|
|
}),
|
|
}
|
|
}
|
|
|
|
pub fn with_disabled_diagnostic<T, F: FnOnce() -> T>(&self, f: F) -> T {
|
|
let prev = self.inner.borrow_mut().quiet;
|
|
self.inner.borrow_mut().quiet = true;
|
|
let ret = f();
|
|
self.inner.borrow_mut().quiet = prev;
|
|
ret
|
|
}
|
|
|
|
// This is here to not allow mutation of flags;
|
|
// as of this writing it's only used in tests in librustc_middle.
|
|
pub fn can_emit_warnings(&self) -> bool {
|
|
self.flags.can_emit_warnings
|
|
}
|
|
|
|
/// Resets the diagnostic error count as well as the cached emitted diagnostics.
|
|
///
|
|
/// NOTE: *do not* call this function from rustc. It is only meant to be called from external
|
|
/// tools that want to reuse a `Parser` cleaning the previously emitted diagnostics as well as
|
|
/// the overall count of emitted error diagnostics.
|
|
pub fn reset_err_count(&self) {
|
|
let mut inner = self.inner.borrow_mut();
|
|
inner.err_count = 0;
|
|
inner.warn_count = 0;
|
|
inner.deduplicated_err_count = 0;
|
|
inner.deduplicated_warn_count = 0;
|
|
|
|
// actually free the underlying memory (which `clear` would not do)
|
|
inner.delayed_span_bugs = Default::default();
|
|
inner.delayed_good_path_bugs = Default::default();
|
|
inner.taught_diagnostics = Default::default();
|
|
inner.emitted_diagnostic_codes = Default::default();
|
|
inner.emitted_diagnostics = Default::default();
|
|
inner.stashed_diagnostics = Default::default();
|
|
}
|
|
|
|
/// Stash a given diagnostic with the given `Span` and `StashKey` as the key for later stealing.
|
|
pub fn stash_diagnostic(&self, span: Span, key: StashKey, diag: Diagnostic) {
|
|
let mut inner = self.inner.borrow_mut();
|
|
// FIXME(Centril, #69537): Consider reintroducing panic on overwriting a stashed diagnostic
|
|
// if/when we have a more robust macro-friendly replacement for `(span, key)` as a key.
|
|
// See the PR for a discussion.
|
|
inner.stashed_diagnostics.insert((span, key), diag);
|
|
}
|
|
|
|
/// Steal a previously stashed diagnostic with the given `Span` and `StashKey` as the key.
|
|
pub fn steal_diagnostic(&self, span: Span, key: StashKey) -> Option<DiagnosticBuilder<'_>> {
|
|
self.inner
|
|
.borrow_mut()
|
|
.stashed_diagnostics
|
|
.remove(&(span, key))
|
|
.map(|diag| DiagnosticBuilder::new_diagnostic(self, diag))
|
|
}
|
|
|
|
/// Emit all stashed diagnostics.
|
|
pub fn emit_stashed_diagnostics(&self) {
|
|
self.inner.borrow_mut().emit_stashed_diagnostics();
|
|
}
|
|
|
|
/// Construct a dummy builder with `Level::Cancelled`.
|
|
///
|
|
/// Using this will neither report anything to the user (e.g. a warning),
|
|
/// nor will compilation cancel as a result.
|
|
pub fn struct_dummy(&self) -> DiagnosticBuilder<'_> {
|
|
DiagnosticBuilder::new(self, Level::Cancelled, "")
|
|
}
|
|
|
|
/// Construct a builder at the `Warning` level at the given `span` and with the `msg`.
|
|
///
|
|
/// The builder will be canceled if warnings cannot be emitted.
|
|
pub fn struct_span_warn(&self, span: impl Into<MultiSpan>, msg: &str) -> DiagnosticBuilder<'_> {
|
|
let mut result = self.struct_warn(msg);
|
|
result.set_span(span);
|
|
result
|
|
}
|
|
|
|
/// Construct a builder at the `Warning` level at the given `span` and with the `msg`.
|
|
///
|
|
/// This will "force" the warning meaning it will not be canceled even
|
|
/// if warnings cannot be emitted.
|
|
pub fn struct_span_force_warn(
|
|
&self,
|
|
span: impl Into<MultiSpan>,
|
|
msg: &str,
|
|
) -> DiagnosticBuilder<'_> {
|
|
let mut result = self.struct_force_warn(msg);
|
|
result.set_span(span);
|
|
result
|
|
}
|
|
|
|
/// Construct a builder at the `Allow` level at the given `span` and with the `msg`.
|
|
pub fn struct_span_allow(
|
|
&self,
|
|
span: impl Into<MultiSpan>,
|
|
msg: &str,
|
|
) -> DiagnosticBuilder<'_> {
|
|
let mut result = self.struct_allow(msg);
|
|
result.set_span(span);
|
|
result
|
|
}
|
|
|
|
/// Construct a builder at the `Warning` level at the given `span` and with the `msg`.
|
|
/// Also include a code.
|
|
pub fn struct_span_warn_with_code(
|
|
&self,
|
|
span: impl Into<MultiSpan>,
|
|
msg: &str,
|
|
code: DiagnosticId,
|
|
) -> DiagnosticBuilder<'_> {
|
|
let mut result = self.struct_span_warn(span, msg);
|
|
result.code(code);
|
|
result
|
|
}
|
|
|
|
/// Construct a builder at the `Warning` level with the `msg`.
|
|
///
|
|
/// The builder will be canceled if warnings cannot be emitted.
|
|
pub fn struct_warn(&self, msg: &str) -> DiagnosticBuilder<'_> {
|
|
let mut result = DiagnosticBuilder::new(self, Level::Warning, msg);
|
|
if !self.flags.can_emit_warnings {
|
|
result.cancel();
|
|
}
|
|
result
|
|
}
|
|
|
|
/// Construct a builder at the `Warning` level with the `msg`.
|
|
///
|
|
/// This will "force" a warning meaning it will not be canceled even
|
|
/// if warnings cannot be emitted.
|
|
pub fn struct_force_warn(&self, msg: &str) -> DiagnosticBuilder<'_> {
|
|
DiagnosticBuilder::new(self, Level::Warning, msg)
|
|
}
|
|
|
|
/// Construct a builder at the `Allow` level with the `msg`.
|
|
pub fn struct_allow(&self, msg: &str) -> DiagnosticBuilder<'_> {
|
|
DiagnosticBuilder::new(self, Level::Allow, msg)
|
|
}
|
|
|
|
/// Construct a builder at the `Error` level at the given `span` and with the `msg`.
|
|
pub fn struct_span_err(&self, span: impl Into<MultiSpan>, msg: &str) -> DiagnosticBuilder<'_> {
|
|
let mut result = self.struct_err(msg);
|
|
result.set_span(span);
|
|
result
|
|
}
|
|
|
|
/// Construct a builder at the `Error` level at the given `span`, with the `msg`, and `code`.
|
|
pub fn struct_span_err_with_code(
|
|
&self,
|
|
span: impl Into<MultiSpan>,
|
|
msg: &str,
|
|
code: DiagnosticId,
|
|
) -> DiagnosticBuilder<'_> {
|
|
let mut result = self.struct_span_err(span, msg);
|
|
result.code(code);
|
|
result
|
|
}
|
|
|
|
/// Construct a builder at the `Error` level with the `msg`.
|
|
// FIXME: This method should be removed (every error should have an associated error code).
|
|
pub fn struct_err(&self, msg: &str) -> DiagnosticBuilder<'_> {
|
|
DiagnosticBuilder::new(self, Level::Error, msg)
|
|
}
|
|
|
|
/// Construct a builder at the `Error` level with the `msg` and the `code`.
|
|
pub fn struct_err_with_code(&self, msg: &str, code: DiagnosticId) -> DiagnosticBuilder<'_> {
|
|
let mut result = self.struct_err(msg);
|
|
result.code(code);
|
|
result
|
|
}
|
|
|
|
/// Construct a builder at the `Fatal` level at the given `span` and with the `msg`.
|
|
pub fn struct_span_fatal(
|
|
&self,
|
|
span: impl Into<MultiSpan>,
|
|
msg: &str,
|
|
) -> DiagnosticBuilder<'_> {
|
|
let mut result = self.struct_fatal(msg);
|
|
result.set_span(span);
|
|
result
|
|
}
|
|
|
|
/// Construct a builder at the `Fatal` level at the given `span`, with the `msg`, and `code`.
|
|
pub fn struct_span_fatal_with_code(
|
|
&self,
|
|
span: impl Into<MultiSpan>,
|
|
msg: &str,
|
|
code: DiagnosticId,
|
|
) -> DiagnosticBuilder<'_> {
|
|
let mut result = self.struct_span_fatal(span, msg);
|
|
result.code(code);
|
|
result
|
|
}
|
|
|
|
/// Construct a builder at the `Error` level with the `msg`.
|
|
pub fn struct_fatal(&self, msg: &str) -> DiagnosticBuilder<'_> {
|
|
DiagnosticBuilder::new(self, Level::Fatal, msg)
|
|
}
|
|
|
|
/// Construct a builder at the `Help` level with the `msg`.
|
|
pub fn struct_help(&self, msg: &str) -> DiagnosticBuilder<'_> {
|
|
DiagnosticBuilder::new(self, Level::Help, msg)
|
|
}
|
|
|
|
/// Construct a builder at the `Note` level with the `msg`.
|
|
pub fn struct_note_without_error(&self, msg: &str) -> DiagnosticBuilder<'_> {
|
|
DiagnosticBuilder::new(self, Level::Note, msg)
|
|
}
|
|
|
|
pub fn span_fatal(&self, span: impl Into<MultiSpan>, msg: &str) -> ! {
|
|
self.emit_diag_at_span(Diagnostic::new(Fatal, msg), span);
|
|
FatalError.raise()
|
|
}
|
|
|
|
pub fn span_fatal_with_code(
|
|
&self,
|
|
span: impl Into<MultiSpan>,
|
|
msg: &str,
|
|
code: DiagnosticId,
|
|
) -> ! {
|
|
self.emit_diag_at_span(Diagnostic::new_with_code(Fatal, Some(code), msg), span);
|
|
FatalError.raise()
|
|
}
|
|
|
|
pub fn span_err(&self, span: impl Into<MultiSpan>, msg: &str) {
|
|
self.emit_diag_at_span(Diagnostic::new(Error, msg), span);
|
|
}
|
|
|
|
pub fn span_err_with_code(&self, span: impl Into<MultiSpan>, msg: &str, code: DiagnosticId) {
|
|
self.emit_diag_at_span(Diagnostic::new_with_code(Error, Some(code), msg), span);
|
|
}
|
|
|
|
pub fn span_warn(&self, span: impl Into<MultiSpan>, msg: &str) {
|
|
self.emit_diag_at_span(Diagnostic::new(Warning, msg), span);
|
|
}
|
|
|
|
pub fn span_warn_with_code(&self, span: impl Into<MultiSpan>, msg: &str, code: DiagnosticId) {
|
|
self.emit_diag_at_span(Diagnostic::new_with_code(Warning, Some(code), msg), span);
|
|
}
|
|
|
|
pub fn span_bug(&self, span: impl Into<MultiSpan>, msg: &str) -> ! {
|
|
self.inner.borrow_mut().span_bug(span, msg)
|
|
}
|
|
|
|
#[track_caller]
|
|
pub fn delay_span_bug(&self, span: impl Into<MultiSpan>, msg: &str) {
|
|
self.inner.borrow_mut().delay_span_bug(span, msg)
|
|
}
|
|
|
|
pub fn delay_good_path_bug(&self, msg: &str) {
|
|
self.inner.borrow_mut().delay_good_path_bug(msg)
|
|
}
|
|
|
|
pub fn span_bug_no_panic(&self, span: impl Into<MultiSpan>, msg: &str) {
|
|
self.emit_diag_at_span(Diagnostic::new(Bug, msg), span);
|
|
}
|
|
|
|
pub fn span_note_without_error(&self, span: impl Into<MultiSpan>, msg: &str) {
|
|
self.emit_diag_at_span(Diagnostic::new(Note, msg), span);
|
|
}
|
|
|
|
pub fn span_note_diag(&self, span: Span, msg: &str) -> DiagnosticBuilder<'_> {
|
|
let mut db = DiagnosticBuilder::new(self, Note, msg);
|
|
db.set_span(span);
|
|
db
|
|
}
|
|
|
|
// NOTE: intentionally doesn't raise an error so rustc_codegen_ssa only reports fatal errors in the main thread
|
|
pub fn fatal(&self, msg: &str) -> FatalError {
|
|
self.inner.borrow_mut().fatal(msg)
|
|
}
|
|
|
|
pub fn err(&self, msg: &str) {
|
|
self.inner.borrow_mut().err(msg);
|
|
}
|
|
|
|
pub fn warn(&self, msg: &str) {
|
|
let mut db = DiagnosticBuilder::new(self, Warning, msg);
|
|
db.emit();
|
|
}
|
|
|
|
pub fn note_without_error(&self, msg: &str) {
|
|
DiagnosticBuilder::new(self, Note, msg).emit();
|
|
}
|
|
|
|
pub fn bug(&self, msg: &str) -> ! {
|
|
self.inner.borrow_mut().bug(msg)
|
|
}
|
|
|
|
#[inline]
|
|
pub fn err_count(&self) -> usize {
|
|
self.inner.borrow().err_count()
|
|
}
|
|
|
|
pub fn has_errors(&self) -> bool {
|
|
self.inner.borrow().has_errors()
|
|
}
|
|
pub fn has_errors_or_delayed_span_bugs(&self) -> bool {
|
|
self.inner.borrow().has_errors_or_delayed_span_bugs()
|
|
}
|
|
|
|
pub fn print_error_count(&self, registry: &Registry) {
|
|
self.inner.borrow_mut().print_error_count(registry)
|
|
}
|
|
|
|
pub fn take_future_breakage_diagnostics(&self) -> Vec<Diagnostic> {
|
|
std::mem::take(&mut self.inner.borrow_mut().future_breakage_diagnostics)
|
|
}
|
|
|
|
pub fn abort_if_errors(&self) {
|
|
self.inner.borrow_mut().abort_if_errors()
|
|
}
|
|
|
|
/// `true` if we haven't taught a diagnostic with this code already.
|
|
/// The caller must then teach the user about such a diagnostic.
|
|
///
|
|
/// Used to suppress emitting the same error multiple times with extended explanation when
|
|
/// calling `-Zteach`.
|
|
pub fn must_teach(&self, code: &DiagnosticId) -> bool {
|
|
self.inner.borrow_mut().must_teach(code)
|
|
}
|
|
|
|
pub fn force_print_diagnostic(&self, db: Diagnostic) {
|
|
self.inner.borrow_mut().force_print_diagnostic(db)
|
|
}
|
|
|
|
pub fn emit_diagnostic(&self, diagnostic: &Diagnostic) {
|
|
self.inner.borrow_mut().emit_diagnostic(diagnostic)
|
|
}
|
|
|
|
fn emit_diag_at_span(&self, mut diag: Diagnostic, sp: impl Into<MultiSpan>) {
|
|
let mut inner = self.inner.borrow_mut();
|
|
inner.emit_diagnostic(diag.set_span(sp));
|
|
}
|
|
|
|
pub fn emit_artifact_notification(&self, path: &Path, artifact_type: &str) {
|
|
self.inner.borrow_mut().emit_artifact_notification(path, artifact_type)
|
|
}
|
|
|
|
pub fn emit_future_breakage_report(&self, diags: Vec<Diagnostic>) {
|
|
self.inner.borrow_mut().emitter.emit_future_breakage_report(diags)
|
|
}
|
|
|
|
pub fn emit_unused_externs(&self, lint_level: &str, unused_externs: &[&str]) {
|
|
self.inner.borrow_mut().emit_unused_externs(lint_level, unused_externs)
|
|
}
|
|
|
|
pub fn delay_as_bug(&self, diagnostic: Diagnostic) {
|
|
self.inner.borrow_mut().delay_as_bug(diagnostic)
|
|
}
|
|
}
|
|
|
|
impl HandlerInner {
|
|
fn must_teach(&mut self, code: &DiagnosticId) -> bool {
|
|
self.taught_diagnostics.insert(code.clone())
|
|
}
|
|
|
|
fn force_print_diagnostic(&mut self, db: Diagnostic) {
|
|
self.emitter.emit_diagnostic(&db);
|
|
}
|
|
|
|
/// Emit all stashed diagnostics.
|
|
fn emit_stashed_diagnostics(&mut self) {
|
|
let diags = self.stashed_diagnostics.drain(..).map(|x| x.1).collect::<Vec<_>>();
|
|
diags.iter().for_each(|diag| self.emit_diagnostic(diag));
|
|
}
|
|
|
|
fn emit_diagnostic(&mut self, diagnostic: &Diagnostic) {
|
|
if diagnostic.cancelled() || self.quiet {
|
|
return;
|
|
}
|
|
|
|
if diagnostic.has_future_breakage() {
|
|
self.future_breakage_diagnostics.push(diagnostic.clone());
|
|
}
|
|
|
|
if diagnostic.level == Warning
|
|
&& !self.flags.can_emit_warnings
|
|
&& !diagnostic.is_force_warn()
|
|
{
|
|
if diagnostic.has_future_breakage() {
|
|
(*TRACK_DIAGNOSTICS)(diagnostic);
|
|
}
|
|
return;
|
|
}
|
|
|
|
(*TRACK_DIAGNOSTICS)(diagnostic);
|
|
|
|
if diagnostic.level == Allow {
|
|
return;
|
|
}
|
|
|
|
if let Some(ref code) = diagnostic.code {
|
|
self.emitted_diagnostic_codes.insert(code.clone());
|
|
}
|
|
|
|
let already_emitted = |this: &mut Self| {
|
|
let mut hasher = StableHasher::new();
|
|
diagnostic.hash(&mut hasher);
|
|
let diagnostic_hash = hasher.finish();
|
|
!this.emitted_diagnostics.insert(diagnostic_hash)
|
|
};
|
|
|
|
// Only emit the diagnostic if we've been asked to deduplicate and
|
|
// haven't already emitted an equivalent diagnostic.
|
|
if !(self.flags.deduplicate_diagnostics && already_emitted(self)) {
|
|
self.emitter.emit_diagnostic(diagnostic);
|
|
if diagnostic.is_error() {
|
|
self.deduplicated_err_count += 1;
|
|
} else if diagnostic.level == Warning {
|
|
self.deduplicated_warn_count += 1;
|
|
}
|
|
}
|
|
if diagnostic.is_error() {
|
|
self.bump_err_count();
|
|
} else {
|
|
self.bump_warn_count();
|
|
}
|
|
}
|
|
|
|
fn emit_artifact_notification(&mut self, path: &Path, artifact_type: &str) {
|
|
self.emitter.emit_artifact_notification(path, artifact_type);
|
|
}
|
|
|
|
fn emit_unused_externs(&mut self, lint_level: &str, unused_externs: &[&str]) {
|
|
self.emitter.emit_unused_externs(lint_level, unused_externs);
|
|
}
|
|
|
|
fn treat_err_as_bug(&self) -> bool {
|
|
self.flags.treat_err_as_bug.map_or(false, |c| self.err_count() >= c.get())
|
|
}
|
|
|
|
fn print_error_count(&mut self, registry: &Registry) {
|
|
self.emit_stashed_diagnostics();
|
|
|
|
let warnings = match self.deduplicated_warn_count {
|
|
0 => String::new(),
|
|
1 => "1 warning emitted".to_string(),
|
|
count => format!("{} warnings emitted", count),
|
|
};
|
|
let errors = match self.deduplicated_err_count {
|
|
0 => String::new(),
|
|
1 => "aborting due to previous error".to_string(),
|
|
count => format!("aborting due to {} previous errors", count),
|
|
};
|
|
if self.treat_err_as_bug() {
|
|
return;
|
|
}
|
|
|
|
match (errors.len(), warnings.len()) {
|
|
(0, 0) => return,
|
|
(0, _) => self.emitter.emit_diagnostic(&Diagnostic::new(Level::Warning, &warnings)),
|
|
(_, 0) => {
|
|
let _ = self.fatal(&errors);
|
|
}
|
|
(_, _) => {
|
|
let _ = self.fatal(&format!("{}; {}", &errors, &warnings));
|
|
}
|
|
}
|
|
|
|
let can_show_explain = self.emitter.should_show_explain();
|
|
let are_there_diagnostics = !self.emitted_diagnostic_codes.is_empty();
|
|
if can_show_explain && are_there_diagnostics {
|
|
let mut error_codes = self
|
|
.emitted_diagnostic_codes
|
|
.iter()
|
|
.filter_map(|x| {
|
|
match &x {
|
|
DiagnosticId::Error(s)
|
|
if let Ok(Some(_explanation)) = registry.try_find_description(s) =>
|
|
{
|
|
Some(s.clone())
|
|
}
|
|
_ => None,
|
|
}
|
|
})
|
|
.collect::<Vec<_>>();
|
|
if !error_codes.is_empty() {
|
|
error_codes.sort();
|
|
if error_codes.len() > 1 {
|
|
let limit = if error_codes.len() > 9 { 9 } else { error_codes.len() };
|
|
self.failure(&format!(
|
|
"Some errors have detailed explanations: {}{}",
|
|
error_codes[..limit].join(", "),
|
|
if error_codes.len() > 9 { "..." } else { "." }
|
|
));
|
|
self.failure(&format!(
|
|
"For more information about an error, try \
|
|
`rustc --explain {}`.",
|
|
&error_codes[0]
|
|
));
|
|
} else {
|
|
self.failure(&format!(
|
|
"For more information about this error, try \
|
|
`rustc --explain {}`.",
|
|
&error_codes[0]
|
|
));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn err_count(&self) -> usize {
|
|
self.err_count + self.stashed_diagnostics.len()
|
|
}
|
|
|
|
fn has_errors(&self) -> bool {
|
|
self.err_count() > 0
|
|
}
|
|
fn has_errors_or_delayed_span_bugs(&self) -> bool {
|
|
self.has_errors() || !self.delayed_span_bugs.is_empty()
|
|
}
|
|
fn has_any_message(&self) -> bool {
|
|
self.err_count() > 0 || self.warn_count > 0
|
|
}
|
|
|
|
fn abort_if_errors(&mut self) {
|
|
self.emit_stashed_diagnostics();
|
|
|
|
if self.has_errors() {
|
|
FatalError.raise();
|
|
}
|
|
}
|
|
|
|
fn span_bug(&mut self, sp: impl Into<MultiSpan>, msg: &str) -> ! {
|
|
self.emit_diag_at_span(Diagnostic::new(Bug, msg), sp);
|
|
panic::panic_any(ExplicitBug);
|
|
}
|
|
|
|
fn emit_diag_at_span(&mut self, mut diag: Diagnostic, sp: impl Into<MultiSpan>) {
|
|
self.emit_diagnostic(diag.set_span(sp));
|
|
}
|
|
|
|
#[track_caller]
|
|
fn delay_span_bug(&mut self, sp: impl Into<MultiSpan>, msg: &str) {
|
|
// This is technically `self.treat_err_as_bug()` but `delay_span_bug` is called before
|
|
// incrementing `err_count` by one, so we need to +1 the comparing.
|
|
// FIXME: Would be nice to increment err_count in a more coherent way.
|
|
if self.flags.treat_err_as_bug.map_or(false, |c| self.err_count() + 1 >= c.get()) {
|
|
// FIXME: don't abort here if report_delayed_bugs is off
|
|
self.span_bug(sp, msg);
|
|
}
|
|
let mut diagnostic = Diagnostic::new(Level::Bug, msg);
|
|
diagnostic.set_span(sp.into());
|
|
diagnostic.note(&format!("delayed at {}", std::panic::Location::caller()));
|
|
self.delay_as_bug(diagnostic)
|
|
}
|
|
|
|
fn delay_good_path_bug(&mut self, msg: &str) {
|
|
let diagnostic = Diagnostic::new(Level::Bug, msg);
|
|
if self.flags.report_delayed_bugs {
|
|
self.emit_diagnostic(&diagnostic);
|
|
}
|
|
let backtrace = std::backtrace::Backtrace::force_capture();
|
|
self.delayed_good_path_bugs.push(DelayedDiagnostic::with_backtrace(diagnostic, backtrace));
|
|
}
|
|
|
|
fn failure(&mut self, msg: &str) {
|
|
self.emit_diagnostic(&Diagnostic::new(FailureNote, msg));
|
|
}
|
|
|
|
fn fatal(&mut self, msg: &str) -> FatalError {
|
|
self.emit_error(Fatal, msg);
|
|
FatalError
|
|
}
|
|
|
|
fn err(&mut self, msg: &str) {
|
|
self.emit_error(Error, msg);
|
|
}
|
|
|
|
/// Emit an error; level should be `Error` or `Fatal`.
|
|
fn emit_error(&mut self, level: Level, msg: &str) {
|
|
if self.treat_err_as_bug() {
|
|
self.bug(msg);
|
|
}
|
|
self.emit_diagnostic(&Diagnostic::new(level, msg));
|
|
}
|
|
|
|
fn bug(&mut self, msg: &str) -> ! {
|
|
self.emit_diagnostic(&Diagnostic::new(Bug, msg));
|
|
panic::panic_any(ExplicitBug);
|
|
}
|
|
|
|
fn delay_as_bug(&mut self, diagnostic: Diagnostic) {
|
|
if self.quiet {
|
|
return;
|
|
}
|
|
if self.flags.report_delayed_bugs {
|
|
self.emit_diagnostic(&diagnostic);
|
|
}
|
|
self.delayed_span_bugs.push(diagnostic);
|
|
}
|
|
|
|
fn flush_delayed(&mut self, bugs: Vec<Diagnostic>, explanation: &str) {
|
|
let has_bugs = !bugs.is_empty();
|
|
for bug in bugs {
|
|
self.emit_diagnostic(&bug);
|
|
}
|
|
if has_bugs {
|
|
panic!("{}", explanation);
|
|
}
|
|
}
|
|
|
|
fn bump_err_count(&mut self) {
|
|
self.err_count += 1;
|
|
self.panic_if_treat_err_as_bug();
|
|
}
|
|
|
|
fn bump_warn_count(&mut self) {
|
|
self.warn_count += 1;
|
|
}
|
|
|
|
fn panic_if_treat_err_as_bug(&self) {
|
|
if self.treat_err_as_bug() {
|
|
match (self.err_count(), self.flags.treat_err_as_bug.map(|c| c.get()).unwrap_or(0)) {
|
|
(1, 1) => panic!("aborting due to `-Z treat-err-as-bug=1`"),
|
|
(0, _) | (1, _) => {}
|
|
(count, as_bug) => panic!(
|
|
"aborting after {} errors due to `-Z treat-err-as-bug={}`",
|
|
count, as_bug,
|
|
),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
struct DelayedDiagnostic {
|
|
inner: Diagnostic,
|
|
note: Backtrace,
|
|
}
|
|
|
|
impl DelayedDiagnostic {
|
|
fn with_backtrace(diagnostic: Diagnostic, backtrace: Backtrace) -> Self {
|
|
DelayedDiagnostic { inner: diagnostic, note: backtrace }
|
|
}
|
|
|
|
fn decorate(mut self) -> Diagnostic {
|
|
self.inner.note(&format!("delayed at {}", self.note));
|
|
self.inner
|
|
}
|
|
}
|
|
|
|
#[derive(Copy, PartialEq, Clone, Hash, Debug, Encodable, Decodable)]
|
|
pub enum Level {
|
|
Bug,
|
|
Fatal,
|
|
Error,
|
|
Warning,
|
|
Note,
|
|
Help,
|
|
Cancelled,
|
|
FailureNote,
|
|
Allow,
|
|
}
|
|
|
|
impl fmt::Display for Level {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
self.to_str().fmt(f)
|
|
}
|
|
}
|
|
|
|
impl Level {
|
|
fn color(self) -> ColorSpec {
|
|
let mut spec = ColorSpec::new();
|
|
match self {
|
|
Bug | Fatal | Error => {
|
|
spec.set_fg(Some(Color::Red)).set_intense(true);
|
|
}
|
|
Warning => {
|
|
spec.set_fg(Some(Color::Yellow)).set_intense(cfg!(windows));
|
|
}
|
|
Note => {
|
|
spec.set_fg(Some(Color::Green)).set_intense(true);
|
|
}
|
|
Help => {
|
|
spec.set_fg(Some(Color::Cyan)).set_intense(true);
|
|
}
|
|
FailureNote => {}
|
|
Allow | Cancelled => unreachable!(),
|
|
}
|
|
spec
|
|
}
|
|
|
|
pub fn to_str(self) -> &'static str {
|
|
match self {
|
|
Bug => "error: internal compiler error",
|
|
Fatal | Error => "error",
|
|
Warning => "warning",
|
|
Note => "note",
|
|
Help => "help",
|
|
FailureNote => "failure-note",
|
|
Cancelled => panic!("Shouldn't call on cancelled error"),
|
|
Allow => panic!("Shouldn't call on allowed error"),
|
|
}
|
|
}
|
|
|
|
pub fn is_failure_note(&self) -> bool {
|
|
matches!(*self, FailureNote)
|
|
}
|
|
}
|
|
|
|
pub fn add_elided_lifetime_in_path_suggestion(
|
|
source_map: &SourceMap,
|
|
db: &mut DiagnosticBuilder<'_>,
|
|
n: usize,
|
|
path_span: Span,
|
|
incl_angl_brckt: bool,
|
|
insertion_span: Span,
|
|
anon_lts: String,
|
|
) {
|
|
let (replace_span, suggestion) = if incl_angl_brckt {
|
|
(insertion_span, anon_lts)
|
|
} else {
|
|
// When possible, prefer a suggestion that replaces the whole
|
|
// `Path<T>` expression with `Path<'_, T>`, rather than inserting `'_, `
|
|
// at a point (which makes for an ugly/confusing label)
|
|
if let Ok(snippet) = source_map.span_to_snippet(path_span) {
|
|
// But our spans can get out of whack due to macros; if the place we think
|
|
// we want to insert `'_` isn't even within the path expression's span, we
|
|
// should bail out of making any suggestion rather than panicking on a
|
|
// subtract-with-overflow or string-slice-out-out-bounds (!)
|
|
// FIXME: can we do better?
|
|
if insertion_span.lo().0 < path_span.lo().0 {
|
|
return;
|
|
}
|
|
let insertion_index = (insertion_span.lo().0 - path_span.lo().0) as usize;
|
|
if insertion_index > snippet.len() {
|
|
return;
|
|
}
|
|
let (before, after) = snippet.split_at(insertion_index);
|
|
(path_span, format!("{}{}{}", before, anon_lts, after))
|
|
} else {
|
|
(insertion_span, anon_lts)
|
|
}
|
|
};
|
|
db.span_suggestion(
|
|
replace_span,
|
|
&format!("indicate the anonymous lifetime{}", pluralize!(n)),
|
|
suggestion,
|
|
Applicability::MachineApplicable,
|
|
);
|
|
}
|
|
|
|
// Useful type to use with `Result<>` indicate that an error has already
|
|
// been reported to the user, so no need to continue checking.
|
|
#[derive(Clone, Copy, Debug, Encodable, Decodable, Hash, PartialEq, Eq)]
|
|
pub struct ErrorReported;
|
|
|
|
rustc_data_structures::impl_stable_hash_via_hash!(ErrorReported);
|