676 lines
23 KiB
Rust
676 lines
23 KiB
Rust
// Copyright 2012 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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pub use self::Level::*;
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pub use self::RenderSpan::*;
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pub use self::ColorConfig::*;
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use self::Destination::*;
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use codemap::{COMMAND_LINE_SP, COMMAND_LINE_EXPN, Pos, Span};
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use codemap;
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use diagnostics;
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use std::cell::{RefCell, Cell};
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use std::fmt;
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use std::io::prelude::*;
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use std::io;
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use term::WriterWrapper;
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use term;
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use libc;
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/// maximum number of lines we will print for each error; arbitrary.
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const MAX_LINES: usize = 6;
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#[derive(Clone, Copy)]
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pub enum RenderSpan {
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/// A FullSpan renders with both with an initial line for the
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/// message, prefixed by file:linenum, followed by a summary of
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/// the source code covered by the span.
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FullSpan(Span),
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/// A FileLine renders with just a line for the message prefixed
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/// by file:linenum.
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FileLine(Span),
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}
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impl RenderSpan {
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fn span(self) -> Span {
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match self {
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FullSpan(s) | FileLine(s) => s
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}
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}
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fn is_full_span(&self) -> bool {
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match self {
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&FullSpan(..) => true,
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&FileLine(..) => false,
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}
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}
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}
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#[derive(Clone, Copy)]
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pub enum ColorConfig {
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Auto,
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Always,
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Never
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}
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pub trait Emitter {
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fn emit(&mut self, cmsp: Option<(&codemap::CodeMap, Span)>,
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msg: &str, code: Option<&str>, lvl: Level);
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fn custom_emit(&mut self, cm: &codemap::CodeMap,
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sp: RenderSpan, msg: &str, lvl: Level);
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}
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/// This structure is used to signify that a task has panicked with a fatal error
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/// from the diagnostics. You can use this with the `Any` trait to figure out
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/// how a rustc task died (if so desired).
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#[derive(Copy)]
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pub struct FatalError;
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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)]
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pub struct ExplicitBug;
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/// A span-handler is like a handler but also
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/// accepts span information for source-location
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/// reporting.
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pub struct SpanHandler {
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pub handler: Handler,
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pub cm: codemap::CodeMap,
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}
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impl SpanHandler {
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pub fn span_fatal(&self, sp: Span, msg: &str) -> ! {
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self.handler.emit(Some((&self.cm, sp)), msg, Fatal);
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panic!(FatalError);
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}
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pub fn span_fatal_with_code(&self, sp: Span, msg: &str, code: &str) -> ! {
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self.handler.emit_with_code(Some((&self.cm, sp)), msg, code, Fatal);
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panic!(FatalError);
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}
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pub fn span_err(&self, sp: Span, msg: &str) {
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self.handler.emit(Some((&self.cm, sp)), msg, Error);
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self.handler.bump_err_count();
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}
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pub fn span_err_with_code(&self, sp: Span, msg: &str, code: &str) {
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self.handler.emit_with_code(Some((&self.cm, sp)), msg, code, Error);
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self.handler.bump_err_count();
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}
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pub fn span_warn(&self, sp: Span, msg: &str) {
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self.handler.emit(Some((&self.cm, sp)), msg, Warning);
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}
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pub fn span_warn_with_code(&self, sp: Span, msg: &str, code: &str) {
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self.handler.emit_with_code(Some((&self.cm, sp)), msg, code, Warning);
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}
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pub fn span_note(&self, sp: Span, msg: &str) {
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self.handler.emit(Some((&self.cm, sp)), msg, Note);
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}
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pub fn span_end_note(&self, sp: Span, msg: &str) {
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self.handler.custom_emit(&self.cm, FullSpan(sp), msg, Note);
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}
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pub fn span_help(&self, sp: Span, msg: &str) {
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self.handler.emit(Some((&self.cm, sp)), msg, Help);
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}
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pub fn fileline_note(&self, sp: Span, msg: &str) {
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self.handler.custom_emit(&self.cm, FileLine(sp), msg, Note);
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}
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pub fn fileline_help(&self, sp: Span, msg: &str) {
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self.handler.custom_emit(&self.cm, FileLine(sp), msg, Help);
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}
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pub fn span_bug(&self, sp: Span, msg: &str) -> ! {
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self.handler.emit(Some((&self.cm, sp)), msg, Bug);
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panic!(ExplicitBug);
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}
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pub fn span_unimpl(&self, sp: Span, msg: &str) -> ! {
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self.span_bug(sp, &format!("unimplemented {}", msg));
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}
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pub fn handler<'a>(&'a self) -> &'a Handler {
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&self.handler
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}
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}
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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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err_count: Cell<usize>,
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emit: RefCell<Box<Emitter + Send>>,
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pub can_emit_warnings: bool
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}
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impl Handler {
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pub fn fatal(&self, msg: &str) -> ! {
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self.emit.borrow_mut().emit(None, msg, None, Fatal);
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panic!(FatalError);
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}
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pub fn err(&self, msg: &str) {
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self.emit.borrow_mut().emit(None, msg, None, Error);
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self.bump_err_count();
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}
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pub fn bump_err_count(&self) {
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self.err_count.set(self.err_count.get() + 1);
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}
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pub fn err_count(&self) -> usize {
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self.err_count.get()
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}
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pub fn has_errors(&self) -> bool {
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self.err_count.get() > 0
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}
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pub fn abort_if_errors(&self) {
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let s;
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match self.err_count.get() {
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0 => return,
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1 => s = "aborting due to previous error".to_string(),
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_ => {
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s = format!("aborting due to {} previous errors",
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self.err_count.get());
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}
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}
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self.fatal(&s[..]);
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}
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pub fn warn(&self, msg: &str) {
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self.emit.borrow_mut().emit(None, msg, None, Warning);
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}
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pub fn note(&self, msg: &str) {
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self.emit.borrow_mut().emit(None, msg, None, Note);
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}
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pub fn help(&self, msg: &str) {
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self.emit.borrow_mut().emit(None, msg, None, Help);
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}
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pub fn bug(&self, msg: &str) -> ! {
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self.emit.borrow_mut().emit(None, msg, None, Bug);
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panic!(ExplicitBug);
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}
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pub fn unimpl(&self, msg: &str) -> ! {
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self.bug(&format!("unimplemented {}", msg));
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}
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pub fn emit(&self,
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cmsp: Option<(&codemap::CodeMap, Span)>,
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msg: &str,
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lvl: Level) {
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if lvl == Warning && !self.can_emit_warnings { return }
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self.emit.borrow_mut().emit(cmsp, msg, None, lvl);
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}
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pub fn emit_with_code(&self,
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cmsp: Option<(&codemap::CodeMap, Span)>,
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msg: &str,
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code: &str,
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lvl: Level) {
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if lvl == Warning && !self.can_emit_warnings { return }
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self.emit.borrow_mut().emit(cmsp, msg, Some(code), lvl);
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}
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pub fn custom_emit(&self, cm: &codemap::CodeMap,
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sp: RenderSpan, msg: &str, lvl: Level) {
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if lvl == Warning && !self.can_emit_warnings { return }
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self.emit.borrow_mut().custom_emit(cm, sp, msg, lvl);
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}
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}
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pub fn mk_span_handler(handler: Handler, cm: codemap::CodeMap) -> SpanHandler {
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SpanHandler {
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handler: handler,
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cm: cm,
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}
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}
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pub fn default_handler(color_config: ColorConfig,
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registry: Option<diagnostics::registry::Registry>,
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can_emit_warnings: bool) -> Handler {
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mk_handler(can_emit_warnings, Box::new(EmitterWriter::stderr(color_config, registry)))
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}
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pub fn mk_handler(can_emit_warnings: bool, e: Box<Emitter + Send>) -> Handler {
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Handler {
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err_count: Cell::new(0),
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emit: RefCell::new(e),
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can_emit_warnings: can_emit_warnings
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}
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}
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#[derive(Copy, PartialEq, Clone, Debug)]
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pub enum Level {
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Bug,
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Fatal,
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Error,
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Warning,
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Note,
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Help,
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}
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impl fmt::Display for Level {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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use std::fmt::Display;
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match *self {
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Bug => "error: internal compiler error".fmt(f),
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Fatal | Error => "error".fmt(f),
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Warning => "warning".fmt(f),
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Note => "note".fmt(f),
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Help => "help".fmt(f),
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}
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}
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}
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impl Level {
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fn color(self) -> term::color::Color {
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match self {
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Bug | Fatal | Error => term::color::BRIGHT_RED,
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Warning => term::color::BRIGHT_YELLOW,
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Note => term::color::BRIGHT_GREEN,
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Help => term::color::BRIGHT_CYAN,
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}
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}
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}
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fn print_maybe_styled(w: &mut EmitterWriter,
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msg: &str,
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color: term::attr::Attr) -> io::Result<()> {
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match w.dst {
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Terminal(ref mut t) => {
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try!(t.attr(color));
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// If `msg` ends in a newline, we need to reset the color before
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// the newline. We're making the assumption that we end up writing
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// to a `LineBufferedWriter`, which means that emitting the reset
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// after the newline ends up buffering the reset until we print
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// another line or exit. Buffering the reset is a problem if we're
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// sharing the terminal with any other programs (e.g. other rustc
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// instances via `make -jN`).
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//
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// Note that if `msg` contains any internal newlines, this will
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// result in the `LineBufferedWriter` flushing twice instead of
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// once, which still leaves the opportunity for interleaved output
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// to be miscolored. We assume this is rare enough that we don't
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// have to worry about it.
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if msg.ends_with("\n") {
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try!(t.write_all(msg[..msg.len()-1].as_bytes()));
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try!(t.reset());
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try!(t.write_all(b"\n"));
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} else {
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try!(t.write_all(msg.as_bytes()));
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try!(t.reset());
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}
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Ok(())
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}
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Raw(ref mut w) => w.write_all(msg.as_bytes()),
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}
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}
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fn print_diagnostic(dst: &mut EmitterWriter, topic: &str, lvl: Level,
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msg: &str, code: Option<&str>) -> io::Result<()> {
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if !topic.is_empty() {
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try!(write!(&mut dst.dst, "{} ", topic));
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}
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try!(print_maybe_styled(dst,
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&format!("{}: ", lvl.to_string()),
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term::attr::ForegroundColor(lvl.color())));
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try!(print_maybe_styled(dst,
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&format!("{}", msg),
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term::attr::Bold));
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match code {
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Some(code) => {
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let style = term::attr::ForegroundColor(term::color::BRIGHT_MAGENTA);
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try!(print_maybe_styled(dst, &format!(" [{}]", code.clone()), style));
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}
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None => ()
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}
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try!(write!(&mut dst.dst, "\n"));
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Ok(())
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}
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pub struct EmitterWriter {
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dst: Destination,
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registry: Option<diagnostics::registry::Registry>
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}
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enum Destination {
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Terminal(Box<term::Terminal<WriterWrapper> + Send>),
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Raw(Box<Write + Send>),
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}
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impl EmitterWriter {
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pub fn stderr(color_config: ColorConfig,
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registry: Option<diagnostics::registry::Registry>) -> EmitterWriter {
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let stderr = io::stderr();
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let use_color = match color_config {
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Always => true,
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Never => false,
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Auto => stderr_isatty(),
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};
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if use_color {
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let dst = match term::stderr() {
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Some(t) => Terminal(t),
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None => Raw(Box::new(stderr)),
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};
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EmitterWriter { dst: dst, registry: registry }
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} else {
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EmitterWriter { dst: Raw(Box::new(stderr)), registry: registry }
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}
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}
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pub fn new(dst: Box<Write + Send>,
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registry: Option<diagnostics::registry::Registry>) -> EmitterWriter {
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EmitterWriter { dst: Raw(dst), registry: registry }
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}
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}
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#[cfg(unix)]
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fn stderr_isatty() -> bool {
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unsafe { libc::isatty(libc::STDERR_FILENO) != 0 }
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}
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#[cfg(windows)]
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fn stderr_isatty() -> bool {
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const STD_ERROR_HANDLE: libc::DWORD = -12;
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extern "system" {
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fn GetStdHandle(which: libc::DWORD) -> libc::HANDLE;
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fn GetConsoleMode(hConsoleHandle: libc::HANDLE,
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lpMode: libc::LPDWORD) -> libc::BOOL;
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}
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unsafe {
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let handle = GetStdHandle(STD_ERROR_HANDLE);
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let mut out = 0;
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GetConsoleMode(handle, &mut out) != 0
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}
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}
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impl Write for Destination {
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fn write(&mut self, bytes: &[u8]) -> io::Result<usize> {
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match *self {
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Terminal(ref mut t) => t.write(bytes),
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Raw(ref mut w) => w.write(bytes),
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}
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}
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fn flush(&mut self) -> io::Result<()> {
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match *self {
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Terminal(ref mut t) => t.flush(),
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Raw(ref mut w) => w.flush(),
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}
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}
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}
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impl Emitter for EmitterWriter {
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fn emit(&mut self,
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cmsp: Option<(&codemap::CodeMap, Span)>,
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msg: &str, code: Option<&str>, lvl: Level) {
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let error = match cmsp {
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Some((cm, COMMAND_LINE_SP)) => emit(self, cm,
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FileLine(COMMAND_LINE_SP),
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msg, code, lvl, false),
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Some((cm, sp)) => emit(self, cm, FullSpan(sp), msg, code, lvl, false),
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None => print_diagnostic(self, "", lvl, msg, code),
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};
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match error {
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Ok(()) => {}
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Err(e) => panic!("failed to print diagnostics: {:?}", e),
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}
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}
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fn custom_emit(&mut self, cm: &codemap::CodeMap,
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sp: RenderSpan, msg: &str, lvl: Level) {
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match emit(self, cm, sp, msg, None, lvl, true) {
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Ok(()) => {}
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Err(e) => panic!("failed to print diagnostics: {:?}", e),
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}
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}
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}
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fn emit(dst: &mut EmitterWriter, cm: &codemap::CodeMap, rsp: RenderSpan,
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msg: &str, code: Option<&str>, lvl: Level, custom: bool) -> io::Result<()> {
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let sp = rsp.span();
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// We cannot check equality directly with COMMAND_LINE_SP
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// since PartialEq is manually implemented to ignore the ExpnId
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let ss = if sp.expn_id == COMMAND_LINE_EXPN {
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"<command line option>".to_string()
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} else {
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cm.span_to_string(sp)
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};
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if custom {
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// we want to tell compiletest/runtest to look at the last line of the
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// span (since `custom_highlight_lines` displays an arrow to the end of
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// the span)
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let span_end = Span { lo: sp.hi, hi: sp.hi, expn_id: sp.expn_id};
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let ses = cm.span_to_string(span_end);
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try!(print_diagnostic(dst, &ses[..], lvl, msg, code));
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if rsp.is_full_span() {
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try!(custom_highlight_lines(dst, cm, sp, lvl, cm.span_to_lines(sp)));
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}
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} else {
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try!(print_diagnostic(dst, &ss[..], lvl, msg, code));
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if rsp.is_full_span() {
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try!(highlight_lines(dst, cm, sp, lvl, cm.span_to_lines(sp)));
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}
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}
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if sp != COMMAND_LINE_SP {
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try!(print_macro_backtrace(dst, cm, sp));
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}
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match code {
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Some(code) =>
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match dst.registry.as_ref().and_then(|registry| registry.find_description(code)) {
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Some(_) => {
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try!(print_diagnostic(dst, &ss[..], Help,
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&format!("pass `--explain {}` to see a detailed \
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explanation", code), None));
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}
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None => ()
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},
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None => (),
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}
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Ok(())
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}
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fn highlight_lines(err: &mut EmitterWriter,
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cm: &codemap::CodeMap,
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sp: Span,
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lvl: Level,
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lines: codemap::FileLines) -> io::Result<()> {
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let fm = &*lines.file;
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let mut elided = false;
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let mut display_lines = &lines.lines[..];
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if display_lines.len() > MAX_LINES {
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display_lines = &display_lines[0..MAX_LINES];
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elided = true;
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}
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// Print the offending lines
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for &line_number in display_lines {
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if let Some(line) = fm.get_line(line_number) {
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try!(write!(&mut err.dst, "{}:{} {}\n", fm.name,
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line_number + 1, line));
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}
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}
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if elided {
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|
let last_line = display_lines[display_lines.len() - 1];
|
|
let s = format!("{}:{} ", fm.name, last_line + 1);
|
|
try!(write!(&mut err.dst, "{0:1$}...\n", "", s.len()));
|
|
}
|
|
|
|
// FIXME (#3260)
|
|
// If there's one line at fault we can easily point to the problem
|
|
if lines.lines.len() == 1 {
|
|
let lo = cm.lookup_char_pos(sp.lo);
|
|
let mut digits = 0;
|
|
let mut num = (lines.lines[0] + 1) / 10;
|
|
|
|
// how many digits must be indent past?
|
|
while num > 0 { num /= 10; digits += 1; }
|
|
|
|
let mut s = String::new();
|
|
// Skip is the number of characters we need to skip because they are
|
|
// part of the 'filename:line ' part of the previous line.
|
|
let skip = fm.name.width(false) + digits + 3;
|
|
for _ in 0..skip {
|
|
s.push(' ');
|
|
}
|
|
if let Some(orig) = fm.get_line(lines.lines[0]) {
|
|
let mut col = skip;
|
|
let mut lastc = ' ';
|
|
let mut iter = orig.chars().enumerate();
|
|
for (pos, ch) in iter.by_ref() {
|
|
lastc = ch;
|
|
if pos >= lo.col.to_usize() { break; }
|
|
// Whenever a tab occurs on the previous line, we insert one on
|
|
// the error-point-squiggly-line as well (instead of a space).
|
|
// That way the squiggly line will usually appear in the correct
|
|
// position.
|
|
match ch {
|
|
'\t' => {
|
|
col += 8 - col%8;
|
|
s.push('\t');
|
|
},
|
|
c => for _ in 0..c.width(false).unwrap_or(0) {
|
|
col += 1;
|
|
s.push(' ');
|
|
},
|
|
}
|
|
}
|
|
|
|
try!(write!(&mut err.dst, "{}", s));
|
|
let mut s = String::from_str("^");
|
|
let count = match lastc {
|
|
// Most terminals have a tab stop every eight columns by default
|
|
'\t' => 8 - col%8,
|
|
_ => lastc.width(false).unwrap_or(0),
|
|
};
|
|
col += count;
|
|
s.extend(::std::iter::repeat('~').take(count));
|
|
|
|
let hi = cm.lookup_char_pos(sp.hi);
|
|
if hi.col != lo.col {
|
|
for (pos, ch) in iter {
|
|
if pos >= hi.col.to_usize() { break; }
|
|
let count = match ch {
|
|
'\t' => 8 - col%8,
|
|
_ => ch.width(false).unwrap_or(0),
|
|
};
|
|
col += count;
|
|
s.extend(::std::iter::repeat('~').take(count));
|
|
}
|
|
}
|
|
|
|
if s.len() > 1 {
|
|
// One extra squiggly is replaced by a "^"
|
|
s.pop();
|
|
}
|
|
|
|
try!(print_maybe_styled(err,
|
|
&format!("{}\n", s),
|
|
term::attr::ForegroundColor(lvl.color())));
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
/// Here are the differences between this and the normal `highlight_lines`:
|
|
/// `custom_highlight_lines` will always put arrow on the last byte of the
|
|
/// span (instead of the first byte). Also, when the span is too long (more
|
|
/// than 6 lines), `custom_highlight_lines` will print the first line, then
|
|
/// dot dot dot, then last line, whereas `highlight_lines` prints the first
|
|
/// six lines.
|
|
fn custom_highlight_lines(w: &mut EmitterWriter,
|
|
cm: &codemap::CodeMap,
|
|
sp: Span,
|
|
lvl: Level,
|
|
lines: codemap::FileLines)
|
|
-> io::Result<()> {
|
|
let fm = &*lines.file;
|
|
|
|
let lines = &lines.lines[..];
|
|
if lines.len() > MAX_LINES {
|
|
if let Some(line) = fm.get_line(lines[0]) {
|
|
try!(write!(&mut w.dst, "{}:{} {}\n", fm.name,
|
|
lines[0] + 1, line));
|
|
}
|
|
try!(write!(&mut w.dst, "...\n"));
|
|
let last_line_number = lines[lines.len() - 1];
|
|
if let Some(last_line) = fm.get_line(last_line_number) {
|
|
try!(write!(&mut w.dst, "{}:{} {}\n", fm.name,
|
|
last_line_number + 1, last_line));
|
|
}
|
|
} else {
|
|
for &line_number in lines {
|
|
if let Some(line) = fm.get_line(line_number) {
|
|
try!(write!(&mut w.dst, "{}:{} {}\n", fm.name,
|
|
line_number + 1, line));
|
|
}
|
|
}
|
|
}
|
|
let last_line_start = format!("{}:{} ", fm.name, lines[lines.len()-1]+1);
|
|
let hi = cm.lookup_char_pos(sp.hi);
|
|
let skip = last_line_start.width(false);
|
|
let mut s = String::new();
|
|
for _ in 0..skip {
|
|
s.push(' ');
|
|
}
|
|
if let Some(orig) = fm.get_line(lines[0]) {
|
|
let iter = orig.chars().enumerate();
|
|
for (pos, ch) in iter {
|
|
// Span seems to use half-opened interval, so subtract 1
|
|
if pos >= hi.col.to_usize() - 1 { break; }
|
|
// Whenever a tab occurs on the previous line, we insert one on
|
|
// the error-point-squiggly-line as well (instead of a space).
|
|
// That way the squiggly line will usually appear in the correct
|
|
// position.
|
|
match ch {
|
|
'\t' => s.push('\t'),
|
|
c => for _ in 0..c.width(false).unwrap_or(0) {
|
|
s.push(' ');
|
|
},
|
|
}
|
|
}
|
|
}
|
|
s.push('^');
|
|
s.push('\n');
|
|
print_maybe_styled(w,
|
|
&s[..],
|
|
term::attr::ForegroundColor(lvl.color()))
|
|
}
|
|
|
|
fn print_macro_backtrace(w: &mut EmitterWriter,
|
|
cm: &codemap::CodeMap,
|
|
sp: Span)
|
|
-> io::Result<()> {
|
|
let cs = try!(cm.with_expn_info(sp.expn_id, |expn_info| -> io::Result<_> {
|
|
match expn_info {
|
|
Some(ei) => {
|
|
let ss = ei.callee.span.map_or(String::new(),
|
|
|span| cm.span_to_string(span));
|
|
let (pre, post) = match ei.callee.format {
|
|
codemap::MacroAttribute => ("#[", "]"),
|
|
codemap::MacroBang => ("", "!")
|
|
};
|
|
try!(print_diagnostic(w, &ss, Note,
|
|
&format!("in expansion of {}{}{}", pre,
|
|
ei.callee.name,
|
|
post), None));
|
|
let ss = cm.span_to_string(ei.call_site);
|
|
try!(print_diagnostic(w, &ss, Note, "expansion site", None));
|
|
Ok(Some(ei.call_site))
|
|
}
|
|
None => Ok(None)
|
|
}
|
|
}));
|
|
cs.map_or(Ok(()), |call_site| print_macro_backtrace(w, cm, call_site))
|
|
}
|
|
|
|
pub fn expect<T, M>(diag: &SpanHandler, opt: Option<T>, msg: M) -> T where
|
|
M: FnOnce() -> String,
|
|
{
|
|
match opt {
|
|
Some(t) => t,
|
|
None => diag.handler().bug(&msg()),
|
|
}
|
|
}
|