318 lines
9.5 KiB
Rust
318 lines
9.5 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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use core::prelude::*;
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use codemap::{Pos, span};
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use codemap;
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use core::io;
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use core::str;
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use core::uint;
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use core::vec;
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use extra::term;
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pub type Emitter = @fn(cmsp: Option<(@codemap::CodeMap, span)>,
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msg: &str,
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lvl: level);
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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 trait handler {
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fn fatal(@mut self, msg: &str) -> !;
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fn err(@mut self, msg: &str);
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fn bump_err_count(@mut self);
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fn err_count(@mut self) -> uint;
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fn has_errors(@mut self) -> bool;
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fn abort_if_errors(@mut self);
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fn warn(@mut self, msg: &str);
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fn note(@mut self, msg: &str);
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// used to indicate a bug in the compiler:
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fn bug(@mut self, msg: &str) -> !;
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fn unimpl(@mut self, msg: &str) -> !;
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fn emit(@mut 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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}
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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 trait span_handler {
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fn span_fatal(@mut self, sp: span, msg: &str) -> !;
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fn span_err(@mut self, sp: span, msg: &str);
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fn span_warn(@mut self, sp: span, msg: &str);
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fn span_note(@mut self, sp: span, msg: &str);
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fn span_bug(@mut self, sp: span, msg: &str) -> !;
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fn span_unimpl(@mut self, sp: span, msg: &str) -> !;
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fn handler(@mut self) -> @handler;
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}
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struct HandlerT {
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err_count: uint,
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emit: Emitter,
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}
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struct CodemapT {
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handler: @handler,
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cm: @codemap::CodeMap,
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}
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impl span_handler for CodemapT {
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fn span_fatal(@mut self, sp: span, msg: &str) -> ! {
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self.handler.emit(Some((self.cm, sp)), msg, fatal);
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fail!();
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}
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fn span_err(@mut 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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fn span_warn(@mut 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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fn span_note(@mut 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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fn span_bug(@mut self, sp: span, msg: &str) -> ! {
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self.span_fatal(sp, ice_msg(msg));
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}
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fn span_unimpl(@mut self, sp: span, msg: &str) -> ! {
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self.span_bug(sp, ~"unimplemented " + msg);
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}
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fn handler(@mut self) -> @handler {
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self.handler
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}
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}
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impl handler for HandlerT {
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fn fatal(@mut self, msg: &str) -> ! {
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(self.emit)(None, msg, fatal);
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fail!();
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}
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fn err(@mut self, msg: &str) {
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(self.emit)(None, msg, error);
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self.bump_err_count();
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}
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fn bump_err_count(@mut self) {
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self.err_count += 1u;
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}
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fn err_count(@mut self) -> uint {
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self.err_count
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}
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fn has_errors(@mut self) -> bool {
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self.err_count > 0u
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}
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fn abort_if_errors(@mut self) {
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let s;
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match self.err_count {
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0u => return,
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1u => s = ~"aborting due to previous error",
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_ => {
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s = fmt!("aborting due to %u previous errors",
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self.err_count);
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}
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}
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self.fatal(s);
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}
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fn warn(@mut self, msg: &str) {
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(self.emit)(None, msg, warning);
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}
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fn note(@mut self, msg: &str) {
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(self.emit)(None, msg, note);
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}
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fn bug(@mut self, msg: &str) -> ! {
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self.fatal(ice_msg(msg));
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}
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fn unimpl(@mut self, msg: &str) -> ! {
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self.bug(~"unimplemented " + msg);
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}
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fn emit(@mut 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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(self.emit)(cmsp, msg, lvl);
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}
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}
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pub fn ice_msg(msg: &str) -> ~str {
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fmt!("internal compiler error: %s", msg)
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}
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pub fn mk_span_handler(handler: @handler, cm: @codemap::CodeMap)
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-> @span_handler {
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@mut CodemapT { handler: handler, cm: cm } as @span_handler
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}
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pub fn mk_handler(emitter: Option<Emitter>) -> @handler {
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let emit: Emitter = match emitter {
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Some(e) => e,
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None => {
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let emit: Emitter = |cmsp, msg, t| emit(cmsp, msg, t);
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emit
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}
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};
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@mut HandlerT { err_count: 0, emit: emit } as @handler
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}
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#[deriving(Eq)]
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pub enum level {
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fatal,
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error,
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warning,
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note,
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}
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fn diagnosticstr(lvl: level) -> ~str {
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match lvl {
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fatal => ~"error",
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error => ~"error",
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warning => ~"warning",
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note => ~"note"
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}
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}
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fn diagnosticcolor(lvl: level) -> u8 {
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match lvl {
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fatal => term::color_bright_red,
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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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}
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}
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fn print_diagnostic(topic: &str, lvl: level, msg: &str) {
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let use_color = term::color_supported() &&
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io::stderr().get_type() == io::Screen;
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if !topic.is_empty() {
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io::stderr().write_str(fmt!("%s ", topic));
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}
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if use_color {
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term::fg(io::stderr(), diagnosticcolor(lvl));
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}
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io::stderr().write_str(fmt!("%s:", diagnosticstr(lvl)));
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if use_color {
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term::reset(io::stderr());
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}
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io::stderr().write_str(fmt!(" %s\n", msg));
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}
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pub fn collect(messages: @mut ~[~str])
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-> @fn(Option<(@codemap::CodeMap, span)>, &str, level) {
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let f: @fn(Option<(@codemap::CodeMap, span)>, &str, level) =
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|_o, msg: &str, _l| { messages.push(msg.to_str()); };
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f
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}
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pub fn emit(cmsp: Option<(@codemap::CodeMap, span)>, msg: &str, lvl: level) {
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match cmsp {
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Some((cm, sp)) => {
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let sp = cm.adjust_span(sp);
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let ss = cm.span_to_str(sp);
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let lines = cm.span_to_lines(sp);
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print_diagnostic(ss, lvl, msg);
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highlight_lines(cm, sp, lines);
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print_macro_backtrace(cm, sp);
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}
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None => {
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print_diagnostic("", lvl, msg);
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}
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}
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}
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fn highlight_lines(cm: @codemap::CodeMap,
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sp: span,
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lines: @codemap::FileLines) {
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let fm = lines.file;
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// arbitrarily only print up to six lines of the error
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let max_lines = 6u;
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let mut elided = false;
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let mut display_lines = /* FIXME (#2543) */ copy lines.lines;
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if display_lines.len() > max_lines {
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display_lines = vec::slice(display_lines, 0u, max_lines).to_vec();
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elided = true;
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}
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// Print the offending lines
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for display_lines.each |line| {
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io::stderr().write_str(fmt!("%s:%u ", fm.name, *line + 1u));
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let s = fm.get_line(*line as int) + "\n";
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io::stderr().write_str(s);
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}
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if elided {
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let last_line = display_lines[display_lines.len() - 1u];
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let s = fmt!("%s:%u ", fm.name, last_line + 1u);
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let mut indent = str::len(s);
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let mut out = ~"";
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while indent > 0u { out += " "; indent -= 1u; }
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out += "...\n";
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io::stderr().write_str(out);
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}
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// FIXME (#3260)
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// If there's one line at fault we can easily point to the problem
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if lines.lines.len() == 1u {
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let lo = cm.lookup_char_pos(sp.lo);
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let mut digits = 0u;
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let mut num = (lines.lines[0] + 1u) / 10u;
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// how many digits must be indent past?
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while num > 0u { num /= 10u; digits += 1u; }
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// indent past |name:## | and the 0-offset column location
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let left = str::len(fm.name) + digits + lo.col.to_uint() + 3u;
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let mut s = ~"";
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// Skip is the number of characters we need to skip because they are
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// part of the 'filename:line ' part of the previous line.
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let skip = str::len(fm.name) + digits + 3u;
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for skip.times() {
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s += " ";
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}
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let orig = fm.get_line(lines.lines[0] as int);
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for uint::range(0u,left-skip) |pos| {
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let curChar = (orig[pos] as char);
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s += match curChar { // Whenever a tab occurs on the previous
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'\t' => "\t", // line, we insert one on the error-point-
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_ => " " // -squigly-line as well (instead of a
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}; // space). This way the squigly-line will
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} // usually appear in the correct position.
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s += "^";
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let hi = cm.lookup_char_pos(sp.hi);
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if hi.col != lo.col {
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// the ^ already takes up one space
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let num_squiglies = hi.col.to_uint()-lo.col.to_uint()-1u;
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for num_squiglies.times() { s += "~"; }
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}
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io::stderr().write_str(s + "\n");
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}
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}
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fn print_macro_backtrace(cm: @codemap::CodeMap, sp: span) {
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for sp.expn_info.each |ei| {
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let ss = ei.callee.span.map_default(@~"", |span| @cm.span_to_str(*span));
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print_diagnostic(*ss, note,
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fmt!("in expansion of %s!", ei.callee.name));
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let ss = cm.span_to_str(ei.call_site);
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print_diagnostic(ss, note, "expansion site");
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print_macro_backtrace(cm, ei.call_site);
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}
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}
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pub fn expect<T:Copy>(diag: @span_handler,
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opt: Option<T>,
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msg: &fn() -> ~str) -> T {
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match opt {
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Some(ref t) => (*t),
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None => diag.handler().bug(msg())
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}
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}
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