rust/src/librustc/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 compiler.
# Note
This API is completely unstable and subject to change.
*/
#![crate_id = "rustc#0.11.0-pre"]
#![comment = "The Rust compiler"]
#![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",
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html_favicon_url = "http://www.rust-lang.org/favicon.ico",
html_root_url = "http://static.rust-lang.org/doc/master")]
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#![allow(deprecated)]
#![feature(macro_rules, globs, struct_variant, managed_boxes, quote,
default_type_params, phase)]
extern crate flate;
extern crate arena;
extern crate graphviz;
extern crate syntax;
extern crate serialize;
extern crate sync;
extern crate getopts;
extern crate collections;
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extern crate time;
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extern crate libc;
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;
pub mod middle {
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pub mod trans;
pub mod ty;
pub mod ty_fold;
pub mod subst;
pub mod resolve;
pub mod resolve_lifetime;
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pub mod typeck;
pub mod check_loop;
pub mod check_match;
pub mod check_const;
pub mod check_static;
pub mod lint;
pub mod borrowck;
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pub mod dataflow;
pub mod mem_categorization;
pub mod liveness;
pub mod kind;
pub mod freevars;
pub mod pat_util;
pub mod region;
pub mod const_eval;
pub mod astencode;
pub mod lang_items;
pub mod privacy;
pub mod entry;
pub mod effect;
pub mod reachable;
pub mod graph;
pub mod cfg;
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pub mod dead;
pub mod expr_use_visitor;
pub mod dependency_format;
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}
pub mod front {
pub mod config;
pub mod test;
pub mod std_inject;
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pub mod assign_node_ids_and_map;
pub mod feature_gate;
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pub mod show_span;
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}
pub mod back {
pub mod abi;
pub mod archive;
pub mod arm;
pub mod link;
pub mod lto;
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pub mod mips;
pub mod rpath;
pub mod svh;
pub mod target_strs;
pub mod x86;
pub mod x86_64;
}
pub mod metadata;
pub mod driver;
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pub mod util {
pub mod common;
pub mod ppaux;
pub mod sha2;
pub mod nodemap;
pub mod fs;
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}
pub mod lib {
pub mod llvm;
pub mod llvmdeps;
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}
pub fn main() {
let args = std::os::args().iter()
.map(|x| x.to_strbuf())
.collect::<Vec<_>>();
std::os::set_exit_status(driver::main_args(args.as_slice()));
}