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Rust: port std::error into libstd_artiq.
See https://github.com/jethrogb/rust-core_io/issues/3.
This commit is contained in:
parent
1c7e1dd645
commit
dec394bc13
453
artiq/runtime.rs/libstd_artiq/error.rs
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453
artiq/runtime.rs/libstd_artiq/error.rs
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@ -0,0 +1,453 @@
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// Copyright 2014 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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//! Traits for working with Errors.
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//!
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//! # The `Error` trait
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//!
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//! `Error` is a trait representing the basic expectations for error values,
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//! i.e. values of type `E` in `Result<T, E>`. At a minimum, errors must provide
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//! a description, but they may optionally provide additional detail (via
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//! `Display`) and cause chain information:
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//!
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//! ```
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//! use std::fmt::Display;
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//!
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//! trait Error: Display {
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//! fn description(&self) -> &str;
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//!
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//! fn cause(&self) -> Option<&Error> { None }
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//! }
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//! ```
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//!
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//! The `cause` method is generally used when errors cross "abstraction
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//! boundaries", i.e. when a one module must report an error that is "caused"
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//! by an error from a lower-level module. This setup makes it possible for the
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//! high-level module to provide its own errors that do not commit to any
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//! particular implementation, but also reveal some of its implementation for
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//! debugging via `cause` chains.
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// A note about crates and the facade:
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//
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// Originally, the `Error` trait was defined in libcore, and the impls
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// were scattered about. However, coherence objected to this
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// arrangement, because to create the blanket impls for `Box` required
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// knowing that `&str: !Error`, and we have no means to deal with that
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// sort of conflict just now. Therefore, for the time being, we have
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// moved the `Error` trait into libstd. As we evolve a sol'n to the
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// coherence challenge (e.g., specialization, neg impls, etc) we can
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// reconsider what crate these items belong in.
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use any::TypeId;
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use boxed::Box;
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use cell;
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use fmt::{self, Debug, Display};
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use marker::{Send, Sync, Reflect};
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use mem::transmute;
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use num;
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use core::raw::TraitObject;
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use str;
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use string::{self, String};
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/// Base functionality for all errors in Rust.
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pub trait Error: Debug + Display + Reflect {
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/// A short description of the error.
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///
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/// The description should not contain newlines or sentence-ending
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/// punctuation, to facilitate embedding in larger user-facing
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/// strings.
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///
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/// # Examples
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///
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/// ```
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/// use std::error::Error;
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///
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/// match "xc".parse::<u32>() {
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/// Err(e) => {
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/// println!("Error: {}", e.description());
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/// }
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/// _ => println!("No error"),
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/// }
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/// ```
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fn description(&self) -> &str;
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/// The lower-level cause of this error, if any.
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///
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/// # Examples
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///
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/// ```
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/// use std::error::Error;
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/// use std::fmt;
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///
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/// #[derive(Debug)]
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/// struct SuperError {
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/// side: SuperErrorSideKick,
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/// }
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///
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/// impl fmt::Display for SuperError {
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/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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/// write!(f, "SuperError is here!")
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/// }
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/// }
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///
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/// impl Error for SuperError {
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/// fn description(&self) -> &str {
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/// "I'm the superhero of errors!"
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/// }
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///
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/// fn cause(&self) -> Option<&Error> {
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/// Some(&self.side)
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/// }
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/// }
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///
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/// #[derive(Debug)]
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/// struct SuperErrorSideKick;
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///
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/// impl fmt::Display for SuperErrorSideKick {
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/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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/// write!(f, "SuperErrorSideKick is here!")
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/// }
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/// }
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///
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/// impl Error for SuperErrorSideKick {
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/// fn description(&self) -> &str {
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/// "I'm SuperError side kick!"
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/// }
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/// }
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///
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/// fn get_super_error() -> Result<(), SuperError> {
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/// Err(SuperError { side: SuperErrorSideKick })
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/// }
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///
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/// fn main() {
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/// match get_super_error() {
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/// Err(e) => {
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/// println!("Error: {}", e.description());
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/// println!("Caused by: {}", e.cause().unwrap());
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/// }
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/// _ => println!("No error"),
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/// }
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/// }
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/// ```
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fn cause(&self) -> Option<&Error> { None }
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/// Get the `TypeId` of `self`
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#[doc(hidden)]
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fn type_id(&self) -> TypeId where Self: 'static {
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TypeId::of::<Self>()
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}
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}
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impl<'a, E: Error + 'a> From<E> for Box<Error + 'a> {
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fn from(err: E) -> Box<Error + 'a> {
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Box::new(err)
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}
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}
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impl<'a, E: Error + Send + Sync + 'a> From<E> for Box<Error + Send + Sync + 'a> {
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fn from(err: E) -> Box<Error + Send + Sync + 'a> {
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Box::new(err)
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}
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}
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impl From<String> for Box<Error + Send + Sync> {
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fn from(err: String) -> Box<Error + Send + Sync> {
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#[derive(Debug)]
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struct StringError(String);
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impl Error for StringError {
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fn description(&self) -> &str { &self.0 }
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}
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impl Display for StringError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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Display::fmt(&self.0, f)
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}
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}
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Box::new(StringError(err))
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}
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}
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impl From<String> for Box<Error> {
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fn from(str_err: String) -> Box<Error> {
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let err1: Box<Error + Send + Sync> = From::from(str_err);
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let err2: Box<Error> = err1;
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err2
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}
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}
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impl<'a, 'b> From<&'b str> for Box<Error + Send + Sync + 'a> {
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fn from(err: &'b str) -> Box<Error + Send + Sync + 'a> {
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From::from(String::from(err))
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}
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}
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impl<'a> From<&'a str> for Box<Error> {
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fn from(err: &'a str) -> Box<Error> {
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From::from(String::from(err))
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}
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}
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impl Error for str::ParseBoolError {
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fn description(&self) -> &str { "failed to parse bool" }
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}
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impl Error for str::Utf8Error {
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fn description(&self) -> &str {
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"invalid utf-8: corrupt contents"
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}
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}
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impl Error for num::ParseIntError {
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fn description(&self) -> &str {
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self.__description()
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}
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}
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impl Error for num::TryFromIntError {
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fn description(&self) -> &str {
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self.__description()
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}
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}
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impl Error for num::ParseFloatError {
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fn description(&self) -> &str {
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self.__description()
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}
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}
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impl Error for string::FromUtf8Error {
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fn description(&self) -> &str {
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"invalid utf-8"
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}
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}
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impl Error for string::FromUtf16Error {
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fn description(&self) -> &str {
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"invalid utf-16"
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}
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}
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impl Error for string::ParseError {
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fn description(&self) -> &str {
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match *self {}
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}
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}
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impl<T: Error> Error for Box<T> {
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fn description(&self) -> &str {
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Error::description(&**self)
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}
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fn cause(&self) -> Option<&Error> {
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Error::cause(&**self)
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}
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}
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impl Error for fmt::Error {
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fn description(&self) -> &str {
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"an error occurred when formatting an argument"
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}
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}
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impl<'a, T: ?Sized + Reflect> Error for cell::BorrowError<'a, T> {
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fn description(&self) -> &str {
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"already mutably borrowed"
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}
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}
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impl<'a, T: ?Sized + Reflect> Error for cell::BorrowMutError<'a, T> {
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fn description(&self) -> &str {
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"already borrowed"
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}
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}
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// copied from any.rs
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impl Error + 'static {
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/// Returns true if the boxed type is the same as `T`
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#[inline]
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pub fn is<T: Error + 'static>(&self) -> bool {
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// Get TypeId of the type this function is instantiated with
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let t = TypeId::of::<T>();
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// Get TypeId of the type in the trait object
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let boxed = self.type_id();
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// Compare both TypeIds on equality
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t == boxed
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}
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/// Returns some reference to the boxed value if it is of type `T`, or
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/// `None` if it isn't.
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#[inline]
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pub fn downcast_ref<T: Error + 'static>(&self) -> Option<&T> {
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if self.is::<T>() {
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unsafe {
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// Get the raw representation of the trait object
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let to: TraitObject = transmute(self);
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// Extract the data pointer
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Some(&*(to.data as *const T))
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}
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} else {
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None
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}
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}
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/// Returns some mutable reference to the boxed value if it is of type `T`, or
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/// `None` if it isn't.
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#[inline]
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pub fn downcast_mut<T: Error + 'static>(&mut self) -> Option<&mut T> {
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if self.is::<T>() {
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unsafe {
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// Get the raw representation of the trait object
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let to: TraitObject = transmute(self);
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// Extract the data pointer
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Some(&mut *(to.data as *const T as *mut T))
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}
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} else {
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None
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}
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}
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}
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impl Error + 'static + Send {
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/// Forwards to the method defined on the type `Any`.
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#[inline]
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pub fn is<T: Error + 'static>(&self) -> bool {
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<Error + 'static>::is::<T>(self)
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}
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/// Forwards to the method defined on the type `Any`.
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#[inline]
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pub fn downcast_ref<T: Error + 'static>(&self) -> Option<&T> {
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<Error + 'static>::downcast_ref::<T>(self)
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}
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/// Forwards to the method defined on the type `Any`.
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#[inline]
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pub fn downcast_mut<T: Error + 'static>(&mut self) -> Option<&mut T> {
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<Error + 'static>::downcast_mut::<T>(self)
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}
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}
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impl Error + 'static + Send + Sync {
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/// Forwards to the method defined on the type `Any`.
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#[inline]
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pub fn is<T: Error + 'static>(&self) -> bool {
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<Error + 'static>::is::<T>(self)
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}
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/// Forwards to the method defined on the type `Any`.
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#[inline]
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pub fn downcast_ref<T: Error + 'static>(&self) -> Option<&T> {
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<Error + 'static>::downcast_ref::<T>(self)
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}
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/// Forwards to the method defined on the type `Any`.
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#[inline]
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pub fn downcast_mut<T: Error + 'static>(&mut self) -> Option<&mut T> {
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<Error + 'static>::downcast_mut::<T>(self)
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}
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}
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impl Error {
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#[inline]
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/// Attempt to downcast the box to a concrete type.
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pub fn downcast<T: Error + 'static>(self: Box<Self>) -> Result<Box<T>, Box<Error>> {
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if self.is::<T>() {
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unsafe {
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// Get the raw representation of the trait object
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let raw = Box::into_raw(self);
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let to: TraitObject =
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transmute::<*mut Error, TraitObject>(raw);
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// Extract the data pointer
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Ok(Box::from_raw(to.data as *mut T))
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}
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} else {
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Err(self)
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}
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}
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}
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impl Error + Send {
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#[inline]
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/// Attempt to downcast the box to a concrete type.
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pub fn downcast<T: Error + 'static>(self: Box<Self>)
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-> Result<Box<T>, Box<Error + Send>> {
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let err: Box<Error> = self;
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<Error>::downcast(err).map_err(|s| unsafe {
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// reapply the Send marker
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transmute::<Box<Error>, Box<Error + Send>>(s)
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})
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}
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}
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impl Error + Send + Sync {
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#[inline]
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/// Attempt to downcast the box to a concrete type.
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pub fn downcast<T: Error + 'static>(self: Box<Self>)
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-> Result<Box<T>, Box<Self>> {
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let err: Box<Error> = self;
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<Error>::downcast(err).map_err(|s| unsafe {
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// reapply the Send+Sync marker
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transmute::<Box<Error>, Box<Error + Send + Sync>>(s)
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})
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}
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}
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#[cfg(test)]
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mod tests {
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use prelude::v1::*;
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use super::Error;
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use fmt;
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#[derive(Debug, PartialEq)]
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struct A;
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#[derive(Debug, PartialEq)]
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struct B;
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impl fmt::Display for A {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "A")
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}
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}
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impl fmt::Display for B {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "B")
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}
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}
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|
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impl Error for A {
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fn description(&self) -> &str { "A-desc" }
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}
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impl Error for B {
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fn description(&self) -> &str { "A-desc" }
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}
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#[test]
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fn downcasting() {
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let mut a = A;
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let mut a = &mut a as &mut (Error + 'static);
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assert_eq!(a.downcast_ref::<A>(), Some(&A));
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assert_eq!(a.downcast_ref::<B>(), None);
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assert_eq!(a.downcast_mut::<A>(), Some(&mut A));
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assert_eq!(a.downcast_mut::<B>(), None);
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|
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let a: Box<Error> = Box::new(A);
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match a.downcast::<B>() {
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Ok(..) => panic!("expected error"),
|
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Err(e) => assert_eq!(*e.downcast::<A>().unwrap(), A),
|
||||
}
|
||||
}
|
||||
}
|
@ -14,7 +14,7 @@ use core::fmt;
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||||
use core::marker::{Send, Sync};
|
||||
use core::option::Option::{self, Some, None};
|
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use core::result;
|
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use collections::string::String;
|
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use error;
|
||||
|
||||
/// A specialized [`Result`](../result/enum.Result.html) type for I/O
|
||||
/// operations.
|
||||
@ -68,7 +68,7 @@ enum Repr {
|
||||
#[derive(Debug)]
|
||||
struct Custom {
|
||||
kind: ErrorKind,
|
||||
error: String,
|
||||
error: Box<error::Error+Send+Sync>,
|
||||
}
|
||||
|
||||
/// A list specifying general categories of I/O error.
|
||||
@ -163,12 +163,12 @@ impl Error {
|
||||
/// let custom_error2 = Error::new(ErrorKind::Interrupted, custom_error);
|
||||
/// ```
|
||||
pub fn new<E>(kind: ErrorKind, error: E) -> Error
|
||||
where E: Into<String>
|
||||
where E: Into<Box<error::Error+Send+Sync>>
|
||||
{
|
||||
Self::_new(kind, error.into())
|
||||
}
|
||||
|
||||
fn _new(kind: ErrorKind, error: String) -> Error {
|
||||
fn _new(kind: ErrorKind, error: Box<error::Error+Send+Sync>) -> Error {
|
||||
Error {
|
||||
repr: Repr::Custom(Box::new(Custom {
|
||||
kind: kind,
|
||||
@ -198,10 +198,10 @@ impl Error {
|
||||
///
|
||||
/// If this `Error` was constructed via `new` then this function will
|
||||
/// return `Some`, otherwise it will return `None`.
|
||||
pub fn get_ref(&self) -> Option<&String> {
|
||||
pub fn get_ref(&self) -> Option<&(error::Error+Send+Sync+'static)> {
|
||||
match self.repr {
|
||||
Repr::Os(..) => None,
|
||||
Repr::Custom(ref c) => Some(&c.error),
|
||||
Repr::Custom(ref c) => Some(&*c.error),
|
||||
}
|
||||
}
|
||||
|
||||
@ -210,10 +210,10 @@ impl Error {
|
||||
///
|
||||
/// If this `Error` was constructed via `new` then this function will
|
||||
/// return `Some`, otherwise it will return `None`.
|
||||
pub fn get_mut(&mut self) -> Option<&mut String> {
|
||||
pub fn get_mut(&mut self) -> Option<&mut (error::Error+Send+Sync+'static)> {
|
||||
match self.repr {
|
||||
Repr::Os(..) => None,
|
||||
Repr::Custom(ref mut c) => Some(&mut c.error),
|
||||
Repr::Custom(ref mut c) => Some(&mut *c.error),
|
||||
}
|
||||
}
|
||||
|
||||
@ -221,7 +221,7 @@ impl Error {
|
||||
///
|
||||
/// If this `Error` was constructed via `new` then this function will
|
||||
/// return `Some`, otherwise it will return `None`.
|
||||
pub fn into_inner(self) -> Option<String> {
|
||||
pub fn into_inner(self) -> Option<Box<error::Error+Send+Sync>> {
|
||||
match self.repr {
|
||||
Repr::Os(..) => None,
|
||||
Repr::Custom(c) => Some(c.error)
|
||||
@ -258,6 +258,42 @@ impl fmt::Display for Error {
|
||||
}
|
||||
}
|
||||
|
||||
impl error::Error for Error {
|
||||
fn description(&self) -> &str {
|
||||
match self.repr {
|
||||
Repr::Os(..) => match self.kind() {
|
||||
ErrorKind::NotFound => "entity not found",
|
||||
ErrorKind::PermissionDenied => "permission denied",
|
||||
ErrorKind::ConnectionRefused => "connection refused",
|
||||
ErrorKind::ConnectionReset => "connection reset",
|
||||
ErrorKind::ConnectionAborted => "connection aborted",
|
||||
ErrorKind::NotConnected => "not connected",
|
||||
ErrorKind::AddrInUse => "address in use",
|
||||
ErrorKind::AddrNotAvailable => "address not available",
|
||||
ErrorKind::BrokenPipe => "broken pipe",
|
||||
ErrorKind::AlreadyExists => "entity already exists",
|
||||
ErrorKind::WouldBlock => "operation would block",
|
||||
ErrorKind::InvalidInput => "invalid input parameter",
|
||||
ErrorKind::InvalidData => "invalid data",
|
||||
ErrorKind::TimedOut => "timed out",
|
||||
ErrorKind::WriteZero => "write zero",
|
||||
ErrorKind::Interrupted => "operation interrupted",
|
||||
ErrorKind::Other => "other os error",
|
||||
ErrorKind::UnexpectedEof => "unexpected end of file",
|
||||
ErrorKind::__Nonexhaustive => unreachable!()
|
||||
},
|
||||
Repr::Custom(ref c) => c.error.description(),
|
||||
}
|
||||
}
|
||||
|
||||
fn cause(&self) -> Option<&error::Error> {
|
||||
match self.repr {
|
||||
Repr::Os(..) => None,
|
||||
Repr::Custom(ref c) => c.error.cause(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn _assert_error_is_sync_send() {
|
||||
fn _is_sync_send<T: Sync+Send>() {}
|
||||
_is_sync_send::<Error>();
|
||||
|
@ -1,5 +1,6 @@
|
||||
#![feature(lang_items, asm, alloc, collections, libc, needs_panic_runtime,
|
||||
question_mark, unicode)]
|
||||
question_mark, unicode, reflect_marker, raw, int_error_internals,
|
||||
try_from, try_borrow)]
|
||||
#![no_std]
|
||||
#![needs_panic_runtime]
|
||||
|
||||
@ -27,6 +28,7 @@ pub mod prelude {
|
||||
}
|
||||
|
||||
pub mod time;
|
||||
pub mod error;
|
||||
pub mod io;
|
||||
|
||||
use core::fmt::Write;
|
||||
|
Loading…
Reference in New Issue
Block a user