93 lines
2.5 KiB
Rust
93 lines
2.5 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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//! Misc low level stuff
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#[allow(missing_doc)];
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use c_str::ToCStr;
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use libc::size_t;
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use libc;
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use repr;
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use rt::task;
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use str;
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pub fn log_str<T>(t: &T) -> ~str {
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use rt::io;
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use rt::io::Decorator;
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let mut result = io::mem::MemWriter::new();
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repr::write_repr(&mut result as &mut io::Writer, t);
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str::from_utf8_owned(result.inner())
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}
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/// Trait for initiating task failure.
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pub trait FailWithCause {
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/// Fail the current task, taking ownership of `cause`
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fn fail_with(cause: Self, file: &'static str, line: uint) -> !;
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}
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impl FailWithCause for ~str {
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fn fail_with(cause: ~str, file: &'static str, line: uint) -> ! {
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do cause.with_c_str |msg_buf| {
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do file.with_c_str |file_buf| {
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task::begin_unwind(msg_buf, file_buf, line as libc::size_t)
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}
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}
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}
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}
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impl FailWithCause for &'static str {
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fn fail_with(cause: &'static str, file: &'static str, line: uint) -> ! {
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do cause.with_c_str |msg_buf| {
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do file.with_c_str |file_buf| {
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task::begin_unwind(msg_buf, file_buf, line as libc::size_t)
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}
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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 cast;
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use sys::*;
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#[test]
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fn synthesize_closure() {
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use unstable::raw::Closure;
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unsafe {
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let x = 10;
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let f: &fn(int) -> int = |y| x + y;
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assert_eq!(f(20), 30);
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let original_closure: Closure = cast::transmute(f);
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let actual_function_pointer = original_closure.code;
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let environment = original_closure.env;
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let new_closure = Closure {
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code: actual_function_pointer,
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env: environment
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};
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let new_f: &fn(int) -> int = cast::transmute(new_closure);
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assert_eq!(new_f(20), 30);
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}
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}
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#[test]
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#[should_fail]
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fn fail_static() { FailWithCause::fail_with("cause", file!(), line!()) }
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#[test]
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#[should_fail]
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fn fail_owned() { FailWithCause::fail_with(~"cause", file!(), line!()) }
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}
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