4ef16741e3
In regards to: https://github.com/rust-lang/rust/issues/19253#issuecomment-64836729 This commit: * Changes the #deriving code so that it generates code that utilizes fewer reexports (in particur Option::* and Result::*), which is necessary to remove those reexports in the future * Changes other areas of the codebase so that fewer reexports are utilized
113 lines
3.9 KiB
Rust
113 lines
3.9 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
#![experimental]
|
|
|
|
use alloc::boxed::Box;
|
|
use any::{Any, AnyRefExt};
|
|
use cell::RefCell;
|
|
use fmt;
|
|
use io::{Writer, IoResult};
|
|
use kinds::Send;
|
|
use option::Option;
|
|
use option::Option::{Some, None};
|
|
use result::Result::Ok;
|
|
use rt::backtrace;
|
|
use rustrt::{Stderr, Stdio};
|
|
use rustrt::local::Local;
|
|
use rustrt::task::Task;
|
|
use str::Str;
|
|
use string::String;
|
|
|
|
// Defined in this module instead of io::stdio so that the unwinding
|
|
thread_local!(pub static LOCAL_STDERR: RefCell<Option<Box<Writer + Send>>> = {
|
|
RefCell::new(None)
|
|
})
|
|
|
|
impl Writer for Stdio {
|
|
fn write(&mut self, bytes: &[u8]) -> IoResult<()> {
|
|
fn fmt_write<F: fmt::FormatWriter>(f: &mut F, bytes: &[u8]) {
|
|
let _ = f.write(bytes);
|
|
}
|
|
fmt_write(self, bytes);
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn on_fail(obj: &(Any+Send), file: &'static str, line: uint) {
|
|
let msg = match obj.downcast_ref::<&'static str>() {
|
|
Some(s) => *s,
|
|
None => match obj.downcast_ref::<String>() {
|
|
Some(s) => s.as_slice(),
|
|
None => "Box<Any>",
|
|
}
|
|
};
|
|
let mut err = Stderr;
|
|
|
|
// It is assumed that all reasonable rust code will have a local task at
|
|
// all times. This means that this `exists` will return true almost all of
|
|
// the time. There are border cases, however, when the runtime has
|
|
// *almost* set up the local task, but hasn't quite gotten there yet. In
|
|
// order to get some better diagnostics, we print on panic and
|
|
// immediately abort the whole process if there is no local task
|
|
// available.
|
|
if !Local::exists(None::<Task>) {
|
|
let _ = writeln!(&mut err, "panicked at '{}', {}:{}", msg, file, line);
|
|
if backtrace::log_enabled() {
|
|
let _ = backtrace::write(&mut err);
|
|
} else {
|
|
let _ = writeln!(&mut err, "run with `RUST_BACKTRACE=1` to \
|
|
see a backtrace");
|
|
}
|
|
return
|
|
}
|
|
|
|
// Peel the name out of local task so we can print it. We've got to be sure
|
|
// that the local task is in TLS while we're printing as I/O may occur.
|
|
let (name, unwinding) = {
|
|
let mut t = Local::borrow(None::<Task>);
|
|
(t.name.take(), t.unwinder.unwinding())
|
|
};
|
|
{
|
|
let n = name.as_ref().map(|n| n.as_slice()).unwrap_or("<unnamed>");
|
|
|
|
let prev = LOCAL_STDERR.with(|s| s.borrow_mut().take());
|
|
match prev {
|
|
Some(mut stderr) => {
|
|
// FIXME: what to do when the task printing panics?
|
|
let _ = writeln!(stderr,
|
|
"task '{}' panicked at '{}', {}:{}\n",
|
|
n, msg, file, line);
|
|
if backtrace::log_enabled() {
|
|
let _ = backtrace::write(&mut *stderr);
|
|
}
|
|
let mut s = Some(stderr);
|
|
LOCAL_STDERR.with(|slot| {
|
|
*slot.borrow_mut() = s.take();
|
|
});
|
|
}
|
|
None => {
|
|
let _ = writeln!(&mut err, "task '{}' panicked at '{}', {}:{}",
|
|
n, msg, file, line);
|
|
if backtrace::log_enabled() {
|
|
let _ = backtrace::write(&mut err);
|
|
}
|
|
}
|
|
}
|
|
|
|
// If this is a double panic, make sure that we printed a backtrace
|
|
// for this panic.
|
|
if unwinding && !backtrace::log_enabled() {
|
|
let _ = backtrace::write(&mut err);
|
|
}
|
|
}
|
|
Local::borrow(None::<Task>).name = name;
|
|
}
|