642 lines
23 KiB
Rust
642 lines
23 KiB
Rust
// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
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html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
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html_root_url = "https://doc.rust-lang.org/nightly/")]
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#![deny(warnings)]
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#![feature(custom_attribute)]
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#![allow(unused_attributes)]
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#![feature(range_contains)]
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#![cfg_attr(unix, feature(libc))]
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#![feature(conservative_impl_trait)]
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#![feature(i128_type)]
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extern crate term;
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#[cfg(unix)]
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extern crate libc;
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extern crate rustc_data_structures;
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extern crate serialize as rustc_serialize;
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extern crate syntax_pos;
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extern crate unicode_width;
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pub use emitter::ColorConfig;
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use self::Level::*;
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use emitter::{Emitter, EmitterWriter};
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use rustc_data_structures::fx::FxHashSet;
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use rustc_data_structures::stable_hasher::StableHasher;
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use std::borrow::Cow;
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use std::cell::{RefCell, Cell};
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use std::mem;
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use std::rc::Rc;
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use std::{error, fmt};
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mod diagnostic;
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mod diagnostic_builder;
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pub mod emitter;
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mod snippet;
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pub mod registry;
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mod styled_buffer;
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mod lock;
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use syntax_pos::{BytePos, Loc, FileLinesResult, FileMap, FileName, MultiSpan, Span, NO_EXPANSION};
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#[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
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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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pub show_code_when_inline: bool,
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}
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#[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
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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, RustcEncodable, RustcDecodable)]
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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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pub trait CodeMapper {
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fn lookup_char_pos(&self, pos: BytePos) -> Loc;
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fn span_to_lines(&self, sp: Span) -> FileLinesResult;
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fn span_to_string(&self, sp: Span) -> String;
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fn span_to_filename(&self, sp: Span) -> FileName;
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fn merge_spans(&self, sp_lhs: Span, sp_rhs: Span) -> Option<Span>;
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fn call_span_if_macro(&self, sp: Span) -> Span;
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fn ensure_filemap_source_present(&self, file_map: Rc<FileMap>) -> bool;
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}
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impl CodeSuggestion {
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/// Returns the assembled code suggestions and whether they should be shown with an underline.
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pub fn splice_lines(&self, cm: &CodeMapper) -> Vec<(String, Vec<SubstitutionPart>)> {
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use syntax_pos::{CharPos, Loc, Pos};
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fn push_trailing(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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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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buf.push_str(match hi_opt {
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Some(hi) => &line[lo..hi],
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None => &line[lo..],
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});
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}
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if let None = hi_opt {
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buf.push('\n');
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}
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}
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}
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assert!(!self.substitutions.is_empty());
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self.substitutions.iter().cloned().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().unwrap();
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let hi = substitution.parts.iter().map(|part| part.span.hi()).min().unwrap();
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let bounding_span = Span::new(lo, hi, NO_EXPANSION);
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let lines = cm.span_to_lines(bounding_span).unwrap();
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assert!(!lines.lines.is_empty());
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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 fm = &lines.file;
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let mut prev_hi = cm.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 = fm.get_line(lines.lines[0].line_index);
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let mut buf = String::new();
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for part in &substitution.parts {
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let cur_lo = cm.lookup_char_pos(part.span.lo());
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if prev_hi.line == cur_lo.line {
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push_trailing(&mut buf, prev_line.as_ref(), &prev_hi, Some(&cur_lo));
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} else {
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push_trailing(&mut buf, prev_line.as_ref(), &prev_hi, None);
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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) = fm.get_line(idx) {
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buf.push_str(line.as_ref());
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buf.push('\n');
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}
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}
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if let Some(cur_line) = fm.get_line(cur_lo.line - 1) {
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buf.push_str(&cur_line[..cur_lo.col.to_usize()]);
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}
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}
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buf.push_str(&part.snippet);
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prev_hi = cm.lookup_char_pos(part.span.hi());
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prev_line = fm.get_line(prev_hi.line - 1);
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}
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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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(buf, substitution.parts)
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}).collect()
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}
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}
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/// Used as a return value to signify a fatal error occurred. (It is also
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/// used as the argument to panic at the moment, but that will eventually
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/// not be true.)
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#[derive(Copy, Clone, Debug)]
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#[must_use]
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pub struct FatalError;
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impl fmt::Display for FatalError {
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fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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write!(f, "parser fatal error")
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}
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}
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impl error::Error for FatalError {
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fn description(&self) -> &str {
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"The parser has encountered a fatal error"
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}
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}
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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) -> Result<(), fmt::Error> {
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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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fn description(&self) -> &str {
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"The parser has encountered an internal bug"
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}
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}
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pub use diagnostic::{Diagnostic, SubDiagnostic, DiagnosticStyledString, DiagnosticId};
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pub use diagnostic_builder::DiagnosticBuilder;
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/// A handler deals with errors; certain errors
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/// (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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pub flags: HandlerFlags,
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err_count: Cell<usize>,
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emitter: RefCell<Box<Emitter>>,
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continue_after_error: Cell<bool>,
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delayed_span_bug: RefCell<Option<Diagnostic>>,
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tracked_diagnostics: RefCell<Option<Vec<Diagnostic>>>,
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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: RefCell<FxHashSet<u128>>,
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}
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#[derive(Default)]
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pub struct HandlerFlags {
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pub can_emit_warnings: bool,
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pub treat_err_as_bug: bool,
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pub external_macro_backtrace: bool,
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}
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impl Handler {
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pub fn with_tty_emitter(color_config: ColorConfig,
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can_emit_warnings: bool,
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treat_err_as_bug: bool,
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cm: Option<Rc<CodeMapper>>)
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-> Handler {
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Handler::with_tty_emitter_and_flags(
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color_config,
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cm,
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HandlerFlags {
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can_emit_warnings,
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treat_err_as_bug,
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.. Default::default()
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})
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}
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pub fn with_tty_emitter_and_flags(color_config: ColorConfig,
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cm: Option<Rc<CodeMapper>>,
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flags: HandlerFlags)
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-> Handler {
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let emitter = Box::new(EmitterWriter::stderr(color_config, cm, false));
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Handler::with_emitter_and_flags(emitter, flags)
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}
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pub fn with_emitter(can_emit_warnings: bool,
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treat_err_as_bug: bool,
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e: Box<Emitter>)
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-> Handler {
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Handler::with_emitter_and_flags(
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e,
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HandlerFlags {
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can_emit_warnings,
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treat_err_as_bug,
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.. Default::default()
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})
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}
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pub fn with_emitter_and_flags(e: Box<Emitter>, flags: HandlerFlags) -> Handler {
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Handler {
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flags,
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err_count: Cell::new(0),
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emitter: RefCell::new(e),
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continue_after_error: Cell::new(true),
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delayed_span_bug: RefCell::new(None),
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tracked_diagnostics: RefCell::new(None),
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emitted_diagnostics: RefCell::new(FxHashSet()),
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}
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}
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pub fn set_continue_after_error(&self, continue_after_error: bool) {
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self.continue_after_error.set(continue_after_error);
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}
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// NOTE: DO NOT call this function from rustc, as it relies on `err_count` being non-zero
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// if an error happened to avoid ICEs. This function should only be called from tools.
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pub fn reset_err_count(&self) {
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self.err_count.set(0);
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}
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pub fn struct_dummy<'a>(&'a self) -> DiagnosticBuilder<'a> {
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DiagnosticBuilder::new(self, Level::Cancelled, "")
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}
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pub fn struct_span_warn<'a, S: Into<MultiSpan>>(&'a self,
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sp: S,
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msg: &str)
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-> DiagnosticBuilder<'a> {
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let mut result = DiagnosticBuilder::new(self, Level::Warning, msg);
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result.set_span(sp);
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if !self.flags.can_emit_warnings {
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result.cancel();
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}
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result
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}
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pub fn struct_span_warn_with_code<'a, S: Into<MultiSpan>>(&'a self,
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sp: S,
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msg: &str,
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code: DiagnosticId)
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-> DiagnosticBuilder<'a> {
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let mut result = DiagnosticBuilder::new(self, Level::Warning, msg);
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result.set_span(sp);
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result.code(code);
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if !self.flags.can_emit_warnings {
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result.cancel();
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}
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result
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}
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pub fn struct_warn<'a>(&'a self, msg: &str) -> DiagnosticBuilder<'a> {
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let mut result = DiagnosticBuilder::new(self, Level::Warning, msg);
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if !self.flags.can_emit_warnings {
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result.cancel();
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}
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result
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}
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pub fn struct_span_err<'a, S: Into<MultiSpan>>(&'a self,
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sp: S,
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msg: &str)
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-> DiagnosticBuilder<'a> {
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let mut result = DiagnosticBuilder::new(self, Level::Error, msg);
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result.set_span(sp);
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result
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}
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pub fn struct_span_err_with_code<'a, S: Into<MultiSpan>>(&'a self,
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sp: S,
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msg: &str,
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code: DiagnosticId)
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-> DiagnosticBuilder<'a> {
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let mut result = DiagnosticBuilder::new(self, Level::Error, msg);
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result.set_span(sp);
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result.code(code);
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result
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}
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// FIXME: This method should be removed (every error should have an associated error code).
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pub fn struct_err<'a>(&'a self, msg: &str) -> DiagnosticBuilder<'a> {
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DiagnosticBuilder::new(self, Level::Error, msg)
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}
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pub fn struct_err_with_code<'a>(
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&'a self,
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msg: &str,
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code: DiagnosticId,
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) -> DiagnosticBuilder<'a> {
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let mut result = DiagnosticBuilder::new(self, Level::Error, msg);
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result.code(code);
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result
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}
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pub fn struct_span_fatal<'a, S: Into<MultiSpan>>(&'a self,
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sp: S,
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msg: &str)
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-> DiagnosticBuilder<'a> {
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let mut result = DiagnosticBuilder::new(self, Level::Fatal, msg);
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result.set_span(sp);
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result
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}
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pub fn struct_span_fatal_with_code<'a, S: Into<MultiSpan>>(&'a self,
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sp: S,
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msg: &str,
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code: DiagnosticId)
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-> DiagnosticBuilder<'a> {
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let mut result = DiagnosticBuilder::new(self, Level::Fatal, msg);
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result.set_span(sp);
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result.code(code);
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result
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}
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pub fn struct_fatal<'a>(&'a self, msg: &str) -> DiagnosticBuilder<'a> {
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DiagnosticBuilder::new(self, Level::Fatal, msg)
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}
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pub fn cancel(&self, err: &mut DiagnosticBuilder) {
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err.cancel();
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}
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fn panic_if_treat_err_as_bug(&self) {
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if self.flags.treat_err_as_bug {
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panic!("encountered error with `-Z treat_err_as_bug");
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}
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}
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pub fn span_fatal<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> FatalError {
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self.emit(&sp.into(), msg, Fatal);
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FatalError
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}
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pub fn span_fatal_with_code<S: Into<MultiSpan>>(&self,
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sp: S,
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msg: &str,
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code: DiagnosticId)
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-> FatalError {
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self.emit_with_code(&sp.into(), msg, code, Fatal);
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FatalError
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}
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pub fn span_err<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
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self.emit(&sp.into(), msg, Error);
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}
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pub fn mut_span_err<'a, S: Into<MultiSpan>>(&'a self,
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sp: S,
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msg: &str)
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-> DiagnosticBuilder<'a> {
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let mut result = DiagnosticBuilder::new(self, Level::Error, msg);
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result.set_span(sp);
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result
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}
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pub fn span_err_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: DiagnosticId) {
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self.emit_with_code(&sp.into(), msg, code, Error);
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}
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pub fn span_warn<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
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self.emit(&sp.into(), msg, Warning);
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}
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pub fn span_warn_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: DiagnosticId) {
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self.emit_with_code(&sp.into(), msg, code, Warning);
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}
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pub fn span_bug<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> ! {
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self.emit(&sp.into(), msg, Bug);
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panic!(ExplicitBug);
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}
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pub fn delay_span_bug<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
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if self.flags.treat_err_as_bug {
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self.span_bug(sp, msg);
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}
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let mut diagnostic = Diagnostic::new(Level::Bug, msg);
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diagnostic.set_span(sp.into());
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*self.delayed_span_bug.borrow_mut() = Some(diagnostic);
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}
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pub fn span_bug_no_panic<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
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self.emit(&sp.into(), msg, Bug);
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}
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pub fn span_note_without_error<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
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self.emit(&sp.into(), msg, Note);
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}
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pub fn span_note_diag<'a>(&'a self,
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sp: Span,
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msg: &str)
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-> DiagnosticBuilder<'a> {
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let mut db = DiagnosticBuilder::new(self, Note, msg);
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db.set_span(sp);
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db
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}
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pub fn span_unimpl<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> ! {
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self.span_bug(sp, &format!("unimplemented {}", msg));
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}
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pub fn fatal(&self, msg: &str) -> FatalError {
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if self.flags.treat_err_as_bug {
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self.bug(msg);
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}
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let mut db = DiagnosticBuilder::new(self, Fatal, msg);
|
|
db.emit();
|
|
FatalError
|
|
}
|
|
pub fn err(&self, msg: &str) {
|
|
if self.flags.treat_err_as_bug {
|
|
self.bug(msg);
|
|
}
|
|
let mut db = DiagnosticBuilder::new(self, Error, msg);
|
|
db.emit();
|
|
}
|
|
pub fn warn(&self, msg: &str) {
|
|
let mut db = DiagnosticBuilder::new(self, Warning, msg);
|
|
db.emit();
|
|
}
|
|
pub fn note_without_error(&self, msg: &str) {
|
|
let mut db = DiagnosticBuilder::new(self, Note, msg);
|
|
db.emit();
|
|
}
|
|
pub fn bug(&self, msg: &str) -> ! {
|
|
let mut db = DiagnosticBuilder::new(self, Bug, msg);
|
|
db.emit();
|
|
panic!(ExplicitBug);
|
|
}
|
|
pub fn unimpl(&self, msg: &str) -> ! {
|
|
self.bug(&format!("unimplemented {}", msg));
|
|
}
|
|
|
|
fn bump_err_count(&self) {
|
|
self.panic_if_treat_err_as_bug();
|
|
self.err_count.set(self.err_count.get() + 1);
|
|
}
|
|
|
|
pub fn err_count(&self) -> usize {
|
|
self.err_count.get()
|
|
}
|
|
|
|
pub fn has_errors(&self) -> bool {
|
|
self.err_count.get() > 0
|
|
}
|
|
pub fn abort_if_errors(&self) {
|
|
let s;
|
|
match self.err_count.get() {
|
|
0 => {
|
|
if let Some(bug) = self.delayed_span_bug.borrow_mut().take() {
|
|
DiagnosticBuilder::new_diagnostic(self, bug).emit();
|
|
}
|
|
return;
|
|
}
|
|
1 => s = "aborting due to previous error".to_string(),
|
|
_ => {
|
|
s = format!("aborting due to {} previous errors", self.err_count.get());
|
|
}
|
|
}
|
|
|
|
panic!(self.fatal(&s));
|
|
}
|
|
pub fn emit(&self, msp: &MultiSpan, msg: &str, lvl: Level) {
|
|
if lvl == Warning && !self.flags.can_emit_warnings {
|
|
return;
|
|
}
|
|
let mut db = DiagnosticBuilder::new(self, lvl, msg);
|
|
db.set_span(msp.clone());
|
|
db.emit();
|
|
if !self.continue_after_error.get() {
|
|
self.abort_if_errors();
|
|
}
|
|
}
|
|
pub fn emit_with_code(&self, msp: &MultiSpan, msg: &str, code: DiagnosticId, lvl: Level) {
|
|
if lvl == Warning && !self.flags.can_emit_warnings {
|
|
return;
|
|
}
|
|
let mut db = DiagnosticBuilder::new_with_code(self, lvl, Some(code), msg);
|
|
db.set_span(msp.clone());
|
|
db.emit();
|
|
if !self.continue_after_error.get() {
|
|
self.abort_if_errors();
|
|
}
|
|
}
|
|
|
|
pub fn track_diagnostics<F, R>(&self, f: F) -> (R, Vec<Diagnostic>)
|
|
where F: FnOnce() -> R
|
|
{
|
|
let prev = mem::replace(&mut *self.tracked_diagnostics.borrow_mut(),
|
|
Some(Vec::new()));
|
|
let ret = f();
|
|
let diagnostics = mem::replace(&mut *self.tracked_diagnostics.borrow_mut(), prev)
|
|
.unwrap();
|
|
(ret, diagnostics)
|
|
}
|
|
|
|
fn emit_db(&self, db: &DiagnosticBuilder) {
|
|
let diagnostic = &**db;
|
|
|
|
if let Some(ref mut list) = *self.tracked_diagnostics.borrow_mut() {
|
|
list.push(diagnostic.clone());
|
|
}
|
|
|
|
let diagnostic_hash = {
|
|
use std::hash::Hash;
|
|
let mut hasher = StableHasher::new();
|
|
diagnostic.hash(&mut hasher);
|
|
hasher.finish()
|
|
};
|
|
|
|
// Only emit the diagnostic if we haven't already emitted an equivalent
|
|
// one:
|
|
if self.emitted_diagnostics.borrow_mut().insert(diagnostic_hash) {
|
|
self.emitter.borrow_mut().emit(db);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
#[derive(Copy, PartialEq, Clone, Hash, Debug, RustcEncodable, RustcDecodable)]
|
|
pub enum Level {
|
|
Bug,
|
|
Fatal,
|
|
// An error which while not immediately fatal, should stop the compiler
|
|
// progressing beyond the current phase.
|
|
PhaseFatal,
|
|
Error,
|
|
Warning,
|
|
Note,
|
|
Help,
|
|
Cancelled,
|
|
}
|
|
|
|
impl fmt::Display for Level {
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
self.to_str().fmt(f)
|
|
}
|
|
}
|
|
|
|
impl Level {
|
|
fn color(self) -> term::color::Color {
|
|
match self {
|
|
Bug | Fatal | PhaseFatal | Error => term::color::BRIGHT_RED,
|
|
Warning => {
|
|
if cfg!(windows) {
|
|
term::color::BRIGHT_YELLOW
|
|
} else {
|
|
term::color::YELLOW
|
|
}
|
|
}
|
|
Note => term::color::BRIGHT_GREEN,
|
|
Help => term::color::BRIGHT_CYAN,
|
|
Cancelled => unreachable!(),
|
|
}
|
|
}
|
|
|
|
pub fn to_str(self) -> &'static str {
|
|
match self {
|
|
Bug => "error: internal compiler error",
|
|
Fatal | PhaseFatal | Error => "error",
|
|
Warning => "warning",
|
|
Note => "note",
|
|
Help => "help",
|
|
Cancelled => panic!("Shouldn't call on cancelled error"),
|
|
}
|
|
}
|
|
}
|