1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! The Rust compiler.
15 //! This API is completely unstable and subject to change.
17 #![crate_name = "rustc_driver"]
19 #![crate_type = "dylib"]
20 #![crate_type = "rlib"]
21 #![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
22 html_favicon_url = "http://www.rust-lang.org/favicon.ico",
23 html_root_url = "http://doc.rust-lang.org/nightly/")]
25 #![feature(default_type_params, globs, macro_rules, phase, quote)]
26 #![feature(slicing_syntax, unsafe_destructor)]
27 #![feature(rustc_diagnostic_macros)]
28 #![feature(unboxed_closures)]
29 #![feature(associated_types)]
34 extern crate graphviz;
37 extern crate rustc_back;
38 extern crate rustc_borrowck;
39 extern crate rustc_resolve;
40 extern crate rustc_trans;
41 extern crate rustc_typeck;
42 extern crate serialize;
43 extern crate "rustc_llvm" as llvm;
46 #[phase(plugin, link)]
54 #[phase(plugin, link)]
61 pub use syntax::diagnostic;
63 use rustc_trans::back::link;
64 use rustc::session::{config, Session, build_session};
65 use rustc::session::config::{Input, PrintRequest};
66 use rustc::lint::Lint;
69 use rustc::DIAGNOSTICS;
71 use std::cmp::Ordering::Equal;
73 use std::iter::repeat;
75 use std::sync::mpsc::channel;
78 use rustc::session::early_error;
82 use syntax::diagnostic::Emitter;
83 use syntax::diagnostics;
91 pub fn run(args: Vec<String>) -> int {
92 monitor(move |:| run_compiler(args.as_slice()));
96 static BUG_REPORT_URL: &'static str =
97 "http://doc.rust-lang.org/complement-bugreport.html";
99 fn run_compiler(args: &[String]) {
100 let matches = match handle_options(args.to_vec()) {
101 Some(matches) => matches,
105 let descriptions = diagnostics::registry::Registry::new(&DIAGNOSTICS);
106 match matches.opt_str("explain") {
108 match descriptions.find_description(code[]) {
109 Some(ref description) => {
110 println!("{}", description);
113 early_error(format!("no extended information for {}", code)[]);
121 let sopts = config::build_session_options(&matches);
122 let odir = matches.opt_str("out-dir").map(|o| Path::new(o));
123 let ofile = matches.opt_str("o").map(|o| Path::new(o));
124 let (input, input_file_path) = match matches.free.len() {
126 if sopts.describe_lints {
127 let mut ls = lint::LintStore::new();
128 ls.register_builtin(None);
129 describe_lints(&ls, false);
132 let sess = build_session(sopts, None, descriptions);
133 if print_crate_info(&sess, None, &odir, &ofile) {
136 early_error("no input filename given");
139 let ifile = matches.free[0][];
141 let contents = io::stdin().read_to_end().unwrap();
142 let src = String::from_utf8(contents).unwrap();
143 (Input::Str(src), None)
145 (Input::File(Path::new(ifile)), Some(Path::new(ifile)))
148 _ => early_error("multiple input filenames provided")
151 let mut sess = build_session(sopts, input_file_path, descriptions);
152 let cfg = config::build_configuration(&sess);
153 if print_crate_info(&sess, Some(&input), &odir, &ofile) {
157 let pretty = matches.opt_default("pretty", "normal").map(|a| {
158 // stable pretty-print variants only
159 pretty::parse_pretty(&sess, a.as_slice(), false)
161 let pretty = if pretty.is_none() &&
162 sess.unstable_options() {
163 matches.opt_str("xpretty").map(|a| {
164 // extended with unstable pretty-print variants
165 pretty::parse_pretty(&sess, a.as_slice(), true)
171 match pretty.into_iter().next() {
172 Some((ppm, opt_uii)) => {
173 pretty::pretty_print_input(sess, cfg, &input, ppm, opt_uii, ofile);
176 None => {/* continue */ }
179 if sess.unstable_options() {
180 sess.opts.show_span = matches.opt_str("show-span");
183 let r = matches.opt_strs("Z");
184 if r.contains(&("ls".to_string())) {
186 Input::File(ref ifile) => {
187 let mut stdout = io::stdout();
188 list_metadata(&sess, &(*ifile), &mut stdout).unwrap();
191 early_error("can not list metadata for stdin");
197 driver::compile_input(sess, cfg, &input, &odir, &ofile, None);
200 /// Returns a version string such as "0.12.0-dev".
201 pub fn release_str() -> Option<&'static str> {
202 option_env!("CFG_RELEASE")
205 /// Returns the full SHA1 hash of HEAD of the Git repo from which rustc was built.
206 pub fn commit_hash_str() -> Option<&'static str> {
207 option_env!("CFG_VER_HASH")
210 /// Returns the "commit date" of HEAD of the Git repo from which rustc was built as a static string.
211 pub fn commit_date_str() -> Option<&'static str> {
212 option_env!("CFG_VER_DATE")
215 /// Prints version information and returns None on success or an error
216 /// message on panic.
217 pub fn version(binary: &str, matches: &getopts::Matches) {
218 let verbose = matches.opt_present("verbose");
220 println!("{} {}", binary, option_env!("CFG_VERSION").unwrap_or("unknown version"));
222 fn unw(x: Option<&str>) -> &str { x.unwrap_or("unknown") }
223 println!("binary: {}", binary);
224 println!("commit-hash: {}", unw(commit_hash_str()));
225 println!("commit-date: {}", unw(commit_date_str()));
226 println!("host: {}", config::host_triple());
227 println!("release: {}", unw(release_str()));
231 fn usage(verbose: bool, include_unstable_options: bool) {
232 let groups = if verbose {
233 config::rustc_optgroups()
235 config::rustc_short_optgroups()
237 let groups : Vec<_> = groups.into_iter()
238 .filter(|x| include_unstable_options || x.is_stable())
241 let message = format!("Usage: rustc [OPTIONS] INPUT");
242 let extra_help = if verbose {
245 "\n --help -v Print the full set of options rustc accepts"
249 -C help Print codegen options
250 -W help Print 'lint' options and default settings
251 -Z help Print internal options for debugging rustc{}\n",
252 getopts::usage(message.as_slice(), groups.as_slice()),
256 fn describe_lints(lint_store: &lint::LintStore, loaded_plugins: bool) {
258 Available lint options:
259 -W <foo> Warn about <foo>
262 -F <foo> Forbid <foo> (deny, and deny all overrides)
266 fn sort_lints(lints: Vec<(&'static Lint, bool)>) -> Vec<&'static Lint> {
267 let mut lints: Vec<_> = lints.into_iter().map(|(x, _)| x).collect();
268 lints.sort_by(|x: &&Lint, y: &&Lint| {
269 match x.default_level.cmp(&y.default_level) {
270 // The sort doesn't case-fold but it's doubtful we care.
271 Equal => x.name.cmp(y.name),
278 fn sort_lint_groups(lints: Vec<(&'static str, Vec<lint::LintId>, bool)>)
279 -> Vec<(&'static str, Vec<lint::LintId>)> {
280 let mut lints: Vec<_> = lints.into_iter().map(|(x, y, _)| (x, y)).collect();
281 lints.sort_by(|&(x, _): &(&'static str, Vec<lint::LintId>),
282 &(y, _): &(&'static str, Vec<lint::LintId>)| {
288 let (plugin, builtin): (Vec<_>, _) = lint_store.get_lints()
289 .iter().cloned().partition(|&(_, p)| p);
290 let plugin = sort_lints(plugin);
291 let builtin = sort_lints(builtin);
293 let (plugin_groups, builtin_groups): (Vec<_>, _) = lint_store.get_lint_groups()
294 .iter().cloned().partition(|&(_, _, p)| p);
295 let plugin_groups = sort_lint_groups(plugin_groups);
296 let builtin_groups = sort_lint_groups(builtin_groups);
298 let max_name_len = plugin.iter().chain(builtin.iter())
299 .map(|&s| s.name.width(true))
301 let padded = |&: x: &str| {
302 let mut s = repeat(" ").take(max_name_len - x.chars().count())
303 .collect::<String>();
308 println!("Lint checks provided by rustc:\n");
309 println!(" {} {:7.7} {}", padded("name"), "default", "meaning");
310 println!(" {} {:7.7} {}", padded("----"), "-------", "-------");
312 let print_lints = |&: lints: Vec<&Lint>| {
313 for lint in lints.into_iter() {
314 let name = lint.name_lower().replace("_", "-");
315 println!(" {} {:7.7} {}",
316 padded(name[]), lint.default_level.as_str(), lint.desc);
321 print_lints(builtin);
325 let max_name_len = plugin_groups.iter().chain(builtin_groups.iter())
326 .map(|&(s, _)| s.width(true))
328 let padded = |&: x: &str| {
329 let mut s = repeat(" ").take(max_name_len - x.chars().count())
330 .collect::<String>();
335 println!("Lint groups provided by rustc:\n");
336 println!(" {} {}", padded("name"), "sub-lints");
337 println!(" {} {}", padded("----"), "---------");
339 let print_lint_groups = |&: lints: Vec<(&'static str, Vec<lint::LintId>)>| {
340 for (name, to) in lints.into_iter() {
341 let name = name.chars().map(|x| x.to_lowercase())
342 .collect::<String>().replace("_", "-");
343 let desc = to.into_iter().map(|x| x.as_str().replace("_", "-"))
344 .collect::<Vec<String>>().connect(", ");
346 padded(name[]), desc);
351 print_lint_groups(builtin_groups);
353 match (loaded_plugins, plugin.len(), plugin_groups.len()) {
354 (false, 0, _) | (false, _, 0) => {
355 println!("Compiler plugins can provide additional lints and lint groups. To see a \
356 listing of these, re-run `rustc -W help` with a crate filename.");
358 (false, _, _) => panic!("didn't load lint plugins but got them anyway!"),
359 (true, 0, 0) => println!("This crate does not load any lint plugins or lint groups."),
362 println!("Lint checks provided by plugins loaded by this crate:\n");
366 println!("Lint groups provided by plugins loaded by this crate:\n");
367 print_lint_groups(plugin_groups);
373 fn describe_debug_flags() {
374 println!("\nAvailable debug options:\n");
375 let r = config::debugging_opts_map();
376 for tuple in r.iter() {
378 (ref name, ref desc, _) => {
379 println!(" -Z {:>20} -- {}", *name, *desc);
385 fn describe_codegen_flags() {
386 println!("\nAvailable codegen options:\n");
387 for &(name, _, opt_type_desc, desc) in config::CG_OPTIONS.iter() {
388 let (width, extra) = match opt_type_desc {
389 Some(..) => (21, "=val"),
392 println!(" -C {:>width$}{} -- {}", name.replace("_", "-"),
393 extra, desc, width=width);
397 /// Process command line options. Emits messages as appropriate. If compilation
398 /// should continue, returns a getopts::Matches object parsed from args, otherwise
400 pub fn handle_options(mut args: Vec<String>) -> Option<getopts::Matches> {
401 // Throw away the first argument, the name of the binary
402 let _binary = args.remove(0);
405 // user did not write `-v` nor `-Z unstable-options`, so do not
406 // include that extra information.
412 match getopts::getopts(args[], config::optgroups()[]) {
414 Err(f_stable_attempt) => {
415 // redo option parsing, including unstable options this time,
416 // in anticipation that the mishandled option was one of the
418 let all_groups : Vec<getopts::OptGroup>
419 = config::rustc_optgroups().into_iter().map(|x|x.opt_group).collect();
420 match getopts::getopts(args.as_slice(), all_groups.as_slice()) {
422 let r = m_unstable.opt_strs("Z");
423 let include_unstable_options = r.iter().any(|x| *x == "unstable-options");
424 if include_unstable_options {
427 early_error(f_stable_attempt.to_string().as_slice());
431 // ignore the error from the unstable attempt; just
432 // pass the error we got from the first try.
433 early_error(f_stable_attempt.to_string().as_slice());
439 let r = matches.opt_strs("Z");
440 let include_unstable_options = r.iter().any(|x| *x == "unstable-options");
442 if matches.opt_present("h") || matches.opt_present("help") {
443 usage(matches.opt_present("verbose"), include_unstable_options);
447 // Don't handle -W help here, because we might first load plugins.
449 let r = matches.opt_strs("Z");
450 if r.iter().any(|x| *x == "help") {
451 describe_debug_flags();
455 let cg_flags = matches.opt_strs("C");
456 if cg_flags.iter().any(|x| *x == "help") {
457 describe_codegen_flags();
461 if cg_flags.contains(&"passes=list".to_string()) {
462 unsafe { ::llvm::LLVMRustPrintPasses(); }
466 if matches.opt_present("version") {
467 version("rustc", &matches);
474 fn print_crate_info(sess: &Session,
475 input: Option<&Input>,
477 ofile: &Option<Path>)
479 if sess.opts.prints.len() == 0 { return false }
481 let attrs = input.map(|input| parse_crate_attrs(sess, input));
482 for req in sess.opts.prints.iter() {
484 PrintRequest::Sysroot => println!("{}", sess.sysroot().display()),
485 PrintRequest::FileNames |
486 PrintRequest::CrateName => {
487 let input = match input {
488 Some(input) => input,
489 None => early_error("no input file provided"),
491 let attrs = attrs.as_ref().unwrap().as_slice();
492 let t_outputs = driver::build_output_filenames(input,
497 let id = link::find_crate_name(Some(sess), attrs.as_slice(),
499 if *req == PrintRequest::CrateName {
503 let crate_types = driver::collect_crate_types(sess, attrs);
504 let metadata = driver::collect_crate_metadata(sess, attrs);
505 *sess.crate_metadata.borrow_mut() = metadata;
506 for &style in crate_types.iter() {
507 let fname = link::filename_for_input(sess, style,
509 &t_outputs.with_extension(""));
510 println!("{}", fname.filename_display());
518 fn parse_crate_attrs(sess: &Session, input: &Input) ->
519 Vec<ast::Attribute> {
520 let result = match *input {
521 Input::File(ref ifile) => {
522 parse::parse_crate_attrs_from_file(ifile,
526 Input::Str(ref src) => {
527 parse::parse_crate_attrs_from_source_str(
528 driver::anon_src().to_string(),
534 result.into_iter().collect()
537 pub fn list_metadata(sess: &Session, path: &Path,
538 out: &mut io::Writer) -> io::IoResult<()> {
539 metadata::loader::list_file_metadata(sess.target.target.options.is_like_osx, path, out)
542 /// Run a procedure which will detect panics in the compiler and print nicer
543 /// error messages rather than just failing the test.
545 /// The diagnostic emitter yielded to the procedure should be used for reporting
546 /// errors of the compiler.
547 pub fn monitor<F:FnOnce()+Send>(f: F) {
548 static STACK_SIZE: uint = 8 * 1024 * 1024; // 8MB
550 let (tx, rx) = channel();
551 let w = io::ChanWriter::new(tx);
552 let mut r = io::ChanReader::new(rx);
554 let mut cfg = thread::Builder::new().name("rustc".to_string());
556 // FIXME: Hacks on hacks. If the env is trying to override the stack size
557 // then *don't* set it explicitly.
558 if os::getenv("RUST_MIN_STACK").is_none() {
559 cfg = cfg.stack_size(STACK_SIZE);
562 match cfg.spawn(move || { std::io::stdio::set_stderr(box w); f() }).join() {
563 Ok(()) => { /* fallthrough */ }
565 // Thread panicked without emitting a fatal diagnostic
566 if !value.is::<diagnostic::FatalError>() {
567 let mut emitter = diagnostic::EmitterWriter::stderr(diagnostic::Auto, None);
569 // a .span_bug or .bug call has already printed what
570 // it wants to print.
571 if !value.is::<diagnostic::ExplicitBug>() {
580 "the compiler unexpectedly panicked. this is a bug.".to_string(),
581 format!("we would appreciate a bug report: {}",
583 "run with `RUST_BACKTRACE=1` for a backtrace".to_string(),
585 for note in xs.iter() {
586 emitter.emit(None, note[], None, diagnostic::Note)
589 match r.read_to_string() {
590 Ok(s) => println!("{}", s),
593 format!("failed to read internal \
601 // Panic so the process returns a failure code, but don't pollute the
602 // output with some unnecessary panic messages, we've already
603 // printed everything that we needed to.
604 io::stdio::set_stderr(box io::util::NullWriter);
611 let args = std::os::args();
612 let result = run(args);
613 std::os::set_exit_status(result);