rust/src/libsyntax/lib.rs

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// Copyright 2012-2013 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.
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/*!
The Rust parser and macro expander.
# Note
This API is completely unstable and subject to change.
*/
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#![crate_id = "syntax#0.11.0-pre"]
#![license = "MIT/ASL2"]
#![crate_type = "dylib"]
#![crate_type = "rlib"]
#![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
html_favicon_url = "http://www.rust-lang.org/favicon.ico",
html_root_url = "http://doc.rust-lang.org/")]
#![feature(macro_rules, globs, managed_boxes, default_type_params, phase,
quote)]
#![allow(deprecated)]
extern crate serialize;
extern crate term;
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!"); }
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#[phase(syntax, link)]
extern crate log;
extern crate fmt_macros;
extern crate debug;
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pub mod util {
pub mod interner;
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#[cfg(test)]
pub mod parser_testing;
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pub mod small_vector;
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}
pub mod syntax {
pub use ext;
pub use parse;
pub use ast;
}
pub mod owned_slice;
pub mod attr;
pub mod diagnostic;
pub mod codemap;
pub mod abi;
pub mod ast;
pub mod ast_util;
pub mod ast_map;
pub mod visit;
pub mod fold;
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pub mod parse;
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pub mod crateid;
pub mod print {
pub mod pp;
pub mod pprust;
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}
pub mod ext {
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pub mod asm;
pub mod base;
pub mod expand;
pub mod quote;
pub mod deriving;
pub mod build;
pub mod tt {
pub mod transcribe;
pub mod macro_parser;
pub mod macro_rules;
}
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pub mod mtwt;
pub mod cfg;
pub mod fmt;
pub mod format;
pub mod env;
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pub mod bytes;
pub mod concat;
pub mod concat_idents;
pub mod log_syntax;
pub mod source_util;
pub mod trace_macros;
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}