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rust/src/test/run-pass/supported-cast.rs
Alex Crichton cc6ec8df95 log: Introduce liblog, the old std::logging 
This commit moves all logging out of the standard library into an external
crate. This crate is the new crate which is responsible for all logging macros
and logging implementation. A few reasons for this change are:

* The crate map has always been a bit of a code smell among rust programs. It
  has difficulty being loaded on almost all platforms, and it's used almost
  exclusively for logging and only logging. Removing the crate map is one of the
  end goals of this movement.

* The compiler has a fair bit of special support for logging. It has the
  __log_level() expression as well as generating a global word per module
  specifying the log level. This is unfairly favoring the built-in logging
  system, and is much better done purely in libraries instead of the compiler
  itself.

* Initialization of logging is much easier to do if there is no reliance on a
  magical crate map being available to set module log levels.

* If the logging library can be written outside of the standard library, there's
  no reason that it shouldn't be. It's likely that we're not going to build the
  highest quality logging library of all time, so third-party libraries should
  be able to provide just as high-quality logging systems as the default one
  provided in the rust distribution.

With a migration such as this, the change does not come for free. There are some
subtle changes in the behavior of liblog vs the previous logging macros:

* The core change of this migration is that there is no longer a physical
  log-level per module. This concept is still emulated (it is quite useful), but
  there is now only a global log level, not a local one. This global log level
  is a reflection of the maximum of all log levels specified. The previously
  generated logging code looked like:

    if specified_level <= __module_log_level() {
        println!(...)
    }

  The newly generated code looks like:

    if specified_level <= ::log::LOG_LEVEL {
        if ::log::module_enabled(module_path!()) {
            println!(...)
        }
    }

  Notably, the first layer of checking is still intended to be "super fast" in
  that it's just a load of a global word and a compare. The second layer of
  checking is executed to determine if the current module does indeed have
  logging turned on.

  This means that if any module has a debug log level turned on, all modules
  with debug log levels get a little bit slower (they all do more expensive
  dynamic checks to determine if they're turned on or not).

  Semantically, this migration brings no change in this respect, but
  runtime-wise, this will have a perf impact on some code.

* A `RUST_LOG=::help` directive will no longer print out a list of all modules
  that can be logged. This is because the crate map will no longer specify the
  log levels of all modules, so the list of modules is not known. Additionally,
  warnings can no longer be provided if a malformed logging directive was
  supplied.

The new "hello world" for logging looks like:

    #[phase(syntax, link)]
    extern crate log;

    fn main() {
        debug!("Hello, world!");
    }
2014-03-15 22:26:36 -07:00

233 lines
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// Copyright 2012 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.
use std::libc;
pub fn main() {
let f = 1 as *libc::FILE;
println!("{}", f as int);
println!("{}", f as uint);
println!("{}", f as i8);
println!("{}", f as i16);
println!("{}", f as i32);
println!("{}", f as i64);
println!("{}", f as u8);
println!("{}", f as u16);
println!("{}", f as u32);
println!("{}", f as u64);
println!("{}", 1 as int);
println!("{}", 1 as uint);
println!("{}", 1 as *libc::FILE);
println!("{}", 1 as i8);
println!("{}", 1 as i16);
println!("{}", 1 as i32);
println!("{}", 1 as i64);
println!("{}", 1 as u8);
println!("{}", 1 as u16);
println!("{}", 1 as u32);
println!("{}", 1 as u64);
println!("{}", 1 as f32);
println!("{}", 1 as f64);
println!("{}", 1u as int);
println!("{}", 1u as uint);
println!("{}", 1u as *libc::FILE);
println!("{}", 1u as i8);
println!("{}", 1u as i16);
println!("{}", 1u as i32);
println!("{}", 1u as i64);
println!("{}", 1u as u8);
println!("{}", 1u as u16);
println!("{}", 1u as u32);
println!("{}", 1u as u64);
println!("{}", 1u as f32);
println!("{}", 1u as f64);
println!("{}", 1i8 as int);
println!("{}", 1i8 as uint);
println!("{}", 1i8 as *libc::FILE);
println!("{}", 1i8 as i8);
println!("{}", 1i8 as i16);
println!("{}", 1i8 as i32);
println!("{}", 1i8 as i64);
println!("{}", 1i8 as u8);
println!("{}", 1i8 as u16);
println!("{}", 1i8 as u32);
println!("{}", 1i8 as u64);
println!("{}", 1i8 as f32);
println!("{}", 1i8 as f64);
println!("{}", 1u8 as int);
println!("{}", 1u8 as uint);
println!("{}", 1u8 as *libc::FILE);
println!("{}", 1u8 as i8);
println!("{}", 1u8 as i16);
println!("{}", 1u8 as i32);
println!("{}", 1u8 as i64);
println!("{}", 1u8 as u8);
println!("{}", 1u8 as u16);
println!("{}", 1u8 as u32);
println!("{}", 1u8 as u64);
println!("{}", 1u8 as f32);
println!("{}", 1u8 as f64);
println!("{}", 1i16 as int);
println!("{}", 1i16 as uint);
println!("{}", 1i16 as *libc::FILE);
println!("{}", 1i16 as i8);
println!("{}", 1i16 as i16);
println!("{}", 1i16 as i32);
println!("{}", 1i16 as i64);
println!("{}", 1i16 as u8);
println!("{}", 1i16 as u16);
println!("{}", 1i16 as u32);
println!("{}", 1i16 as u64);
println!("{}", 1i16 as f32);
println!("{}", 1i16 as f64);
println!("{}", 1u16 as int);
println!("{}", 1u16 as uint);
println!("{}", 1u16 as *libc::FILE);
println!("{}", 1u16 as i8);
println!("{}", 1u16 as i16);
println!("{}", 1u16 as i32);
println!("{}", 1u16 as i64);
println!("{}", 1u16 as u8);
println!("{}", 1u16 as u16);
println!("{}", 1u16 as u32);
println!("{}", 1u16 as u64);
println!("{}", 1u16 as f32);
println!("{}", 1u16 as f64);
println!("{}", 1i32 as int);
println!("{}", 1i32 as uint);
println!("{}", 1i32 as *libc::FILE);
println!("{}", 1i32 as i8);
println!("{}", 1i32 as i16);
println!("{}", 1i32 as i32);
println!("{}", 1i32 as i64);
println!("{}", 1i32 as u8);
println!("{}", 1i32 as u16);
println!("{}", 1i32 as u32);
println!("{}", 1i32 as u64);
println!("{}", 1i32 as f32);
println!("{}", 1i32 as f64);
println!("{}", 1u32 as int);
println!("{}", 1u32 as uint);
println!("{}", 1u32 as *libc::FILE);
println!("{}", 1u32 as i8);
println!("{}", 1u32 as i16);
println!("{}", 1u32 as i32);
println!("{}", 1u32 as i64);
println!("{}", 1u32 as u8);
println!("{}", 1u32 as u16);
println!("{}", 1u32 as u32);
println!("{}", 1u32 as u64);
println!("{}", 1u32 as f32);
println!("{}", 1u32 as f64);
println!("{}", 1i64 as int);
println!("{}", 1i64 as uint);
println!("{}", 1i64 as *libc::FILE);
println!("{}", 1i64 as i8);
println!("{}", 1i64 as i16);
println!("{}", 1i64 as i32);
println!("{}", 1i64 as i64);
println!("{}", 1i64 as u8);
println!("{}", 1i64 as u16);
println!("{}", 1i64 as u32);
println!("{}", 1i64 as u64);
println!("{}", 1i64 as f32);
println!("{}", 1i64 as f64);
println!("{}", 1u64 as int);
println!("{}", 1u64 as uint);
println!("{}", 1u64 as *libc::FILE);
println!("{}", 1u64 as i8);
println!("{}", 1u64 as i16);
println!("{}", 1u64 as i32);
println!("{}", 1u64 as i64);
println!("{}", 1u64 as u8);
println!("{}", 1u64 as u16);
println!("{}", 1u64 as u32);
println!("{}", 1u64 as u64);
println!("{}", 1u64 as f32);
println!("{}", 1u64 as f64);
println!("{}", 1u64 as int);
println!("{}", 1u64 as uint);
println!("{}", 1u64 as *libc::FILE);
println!("{}", 1u64 as i8);
println!("{}", 1u64 as i16);
println!("{}", 1u64 as i32);
println!("{}", 1u64 as i64);
println!("{}", 1u64 as u8);
println!("{}", 1u64 as u16);
println!("{}", 1u64 as u32);
println!("{}", 1u64 as u64);
println!("{}", 1u64 as f32);
println!("{}", 1u64 as f64);
println!("{}", true as int);
println!("{}", true as uint);
println!("{}", true as *libc::FILE);
println!("{}", true as i8);
println!("{}", true as i16);
println!("{}", true as i32);
println!("{}", true as i64);
println!("{}", true as u8);
println!("{}", true as u16);
println!("{}", true as u32);
println!("{}", true as u64);
println!("{}", true as f32);
println!("{}", true as f64);
println!("{}", 1. as int);
println!("{}", 1. as uint);
println!("{}", 1. as i8);
println!("{}", 1. as i16);
println!("{}", 1. as i32);
println!("{}", 1. as i64);
println!("{}", 1. as u8);
println!("{}", 1. as u16);
println!("{}", 1. as u32);
println!("{}", 1. as u64);
println!("{}", 1. as f32);
println!("{}", 1. as f64);
println!("{}", 1f32 as int);
println!("{}", 1f32 as uint);
println!("{}", 1f32 as i8);
println!("{}", 1f32 as i16);
println!("{}", 1f32 as i32);
println!("{}", 1f32 as i64);
println!("{}", 1f32 as u8);
println!("{}", 1f32 as u16);
println!("{}", 1f32 as u32);
println!("{}", 1f32 as u64);
println!("{}", 1f32 as f32);
println!("{}", 1f32 as f64);
println!("{}", 1f64 as int);
println!("{}", 1f64 as uint);
println!("{}", 1f64 as i8);
println!("{}", 1f64 as i16);
println!("{}", 1f64 as i32);
println!("{}", 1f64 as i64);
println!("{}", 1f64 as u8);
println!("{}", 1f64 as u16);
println!("{}", 1f64 as u32);
println!("{}", 1f64 as u64);
println!("{}", 1f64 as f32);
println!("{}", 1f64 as f64);
}
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