1 // Copyright 2014-2015 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 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
18 html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
19 html_root_url = "https://doc.rust-lang.org/nightly/")]
21 #![feature(box_syntax)]
22 #![cfg_attr(unix, feature(libc))]
24 #![feature(rustc_diagnostic_macros)]
25 #![feature(slice_sort_by_cached_key)]
26 #![feature(set_stdio)]
27 #![feature(rustc_stack_internals)]
30 #![recursion_limit="256"]
34 extern crate graphviz;
35 extern crate env_logger;
38 extern crate rustc_rayon as rayon;
40 extern crate rustc_allocator;
41 extern crate rustc_target;
42 extern crate rustc_borrowck;
43 extern crate rustc_data_structures;
44 extern crate rustc_errors as errors;
45 extern crate rustc_passes;
46 extern crate rustc_lint;
47 extern crate rustc_plugin;
48 extern crate rustc_privacy;
49 extern crate rustc_incremental;
50 extern crate rustc_metadata;
51 extern crate rustc_mir;
52 extern crate rustc_resolve;
53 extern crate rustc_save_analysis;
54 extern crate rustc_traits;
55 extern crate rustc_codegen_utils;
56 extern crate rustc_typeck;
57 extern crate scoped_tls;
58 extern crate serialize;
62 extern crate syntax_ext;
63 extern crate syntax_pos;
65 use driver::CompileController;
66 use pretty::{PpMode, UserIdentifiedItem};
68 use rustc_resolve as resolve;
69 use rustc_save_analysis as save;
70 use rustc_save_analysis::DumpHandler;
71 use rustc_data_structures::sync::{self, Lrc};
72 use rustc_data_structures::OnDrop;
73 use rustc::session::{self, config, Session, build_session, CompileResult};
74 use rustc::session::CompileIncomplete;
75 use rustc::session::config::{Input, PrintRequest, ErrorOutputType};
76 use rustc::session::config::nightly_options;
77 use rustc::session::filesearch;
78 use rustc::session::{early_error, early_warn};
79 use rustc::lint::Lint;
81 use rustc_metadata::locator;
82 use rustc_metadata::cstore::CStore;
83 use rustc_metadata::dynamic_lib::DynamicLibrary;
84 use rustc::util::common::{time, ErrorReported};
85 use rustc_codegen_utils::codegen_backend::CodegenBackend;
87 use serialize::json::ToJson;
91 use std::default::Default;
92 use std::env::consts::{DLL_PREFIX, DLL_SUFFIX};
94 use std::error::Error;
95 use std::ffi::OsString;
96 use std::fmt::{self, Display};
97 use std::io::{self, Read, Write};
100 use std::path::{PathBuf, Path};
101 use std::process::{self, Command, Stdio};
103 use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
104 use std::sync::{Once, ONCE_INIT};
108 use syntax::codemap::{CodeMap, FileLoader, RealFileLoader};
109 use syntax::feature_gate::{GatedCfg, UnstableFeatures};
110 use syntax::parse::{self, PResult};
111 use syntax_pos::{hygiene, DUMMY_SP, MultiSpan, FileName};
119 mod derive_registrar;
121 pub mod target_features {
123 use syntax::symbol::Symbol;
124 use rustc::session::Session;
125 use rustc_codegen_utils::codegen_backend::CodegenBackend;
127 /// Add `target_feature = "..."` cfgs for a variety of platform
128 /// specific features (SSE, NEON etc.).
130 /// This is performed by checking whether a whitelisted set of
131 /// features is available on the target machine, by querying LLVM.
132 pub fn add_configuration(cfg: &mut ast::CrateConfig,
134 codegen_backend: &dyn CodegenBackend) {
135 let tf = Symbol::intern("target_feature");
137 for feat in codegen_backend.target_features(sess) {
138 cfg.insert((tf, Some(feat)));
141 if sess.crt_static_feature() {
142 cfg.insert((tf, Some(Symbol::intern("crt-static"))));
147 /// Exit status code used for successful compilation and help output.
148 pub const EXIT_SUCCESS: isize = 0;
150 /// Exit status code used for compilation failures and invalid flags.
151 pub const EXIT_FAILURE: isize = 1;
153 const BUG_REPORT_URL: &'static str = "https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.\
156 const ICE_REPORT_COMPILER_FLAGS: &'static [&'static str] = &[
161 const ICE_REPORT_COMPILER_FLAGS_EXCLUDE: &'static [&'static str] = &[
165 const ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE: &'static [&'static str] = &[
169 pub fn abort_on_err<T>(result: Result<T, CompileIncomplete>, sess: &Session) -> T {
171 Err(CompileIncomplete::Errored(ErrorReported)) => {
172 sess.abort_if_errors();
173 panic!("error reported but abort_if_errors didn't abort???");
175 Err(CompileIncomplete::Stopped) => {
176 sess.fatal("compilation terminated");
182 pub fn run<F>(run_compiler: F) -> isize
183 where F: FnOnce() -> (CompileResult, Option<Session>) + Send + 'static
185 let result = monitor(move || {
186 let (result, session) = run_compiler();
187 if let Err(CompileIncomplete::Errored(_)) = result {
190 sess.abort_if_errors();
191 panic!("error reported but abort_if_errors didn't abort???");
195 errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
199 let handler = errors::Handler::with_emitter(true, false, Box::new(emitter));
200 handler.emit(&MultiSpan::new(),
201 "aborting due to previous error(s)",
202 errors::Level::Fatal);
203 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
210 Ok(()) => EXIT_SUCCESS,
211 Err(_) => EXIT_FAILURE,
215 fn load_backend_from_dylib(path: &Path) -> fn() -> Box<dyn CodegenBackend> {
216 // Note that we're specifically using `open_global_now` here rather than
217 // `open`, namely we want the behavior on Unix of RTLD_GLOBAL and RTLD_NOW,
218 // where NOW means "bind everything right now" because we don't want
219 // surprises later on and RTLD_GLOBAL allows the symbols to be made
220 // available for future dynamic libraries opened. This is currently used by
221 // loading LLVM and then making its symbols available for other dynamic
223 let lib = match DynamicLibrary::open_global_now(path) {
226 let err = format!("couldn't load codegen backend {:?}: {:?}",
229 early_error(ErrorOutputType::default(), &err);
233 match lib.symbol("__rustc_codegen_backend") {
236 mem::transmute::<*mut u8, _>(f)
239 let err = format!("couldn't load codegen backend as it \
240 doesn't export the `__rustc_codegen_backend` \
242 early_error(ErrorOutputType::default(), &err);
248 pub fn get_codegen_backend(sess: &Session) -> Box<dyn CodegenBackend> {
249 static INIT: Once = ONCE_INIT;
253 static mut LOAD: fn() -> Box<dyn CodegenBackend> = || unreachable!();
256 let codegen_name = sess.opts.debugging_opts.codegen_backend.as_ref()
257 .unwrap_or(&sess.target.target.options.codegen_backend);
258 let backend = match &codegen_name[..] {
260 rustc_codegen_utils::codegen_backend::MetadataOnlyCodegenBackend::new
262 filename if filename.contains(".") => {
263 load_backend_from_dylib(filename.as_ref())
265 codegen_name => get_codegen_sysroot(codegen_name),
272 let backend = unsafe { LOAD() };
277 fn get_codegen_sysroot(backend_name: &str) -> fn() -> Box<dyn CodegenBackend> {
278 // For now we only allow this function to be called once as it'll dlopen a
279 // few things, which seems to work best if we only do that once. In
280 // general this assertion never trips due to the once guard in `get_codegen_backend`,
281 // but there's a few manual calls to this function in this file we protect
283 static LOADED: AtomicBool = ATOMIC_BOOL_INIT;
284 assert!(!LOADED.fetch_or(true, Ordering::SeqCst),
285 "cannot load the default codegen backend twice");
287 // When we're compiling this library with `--test` it'll run as a binary but
288 // not actually exercise much functionality. As a result most of the logic
289 // here is defunkt (it assumes we're a dynamic library in a sysroot) so
290 // let's just return a dummy creation function which won't be used in
293 return rustc_codegen_utils::codegen_backend::MetadataOnlyCodegenBackend::new
296 let target = session::config::host_triple();
297 let mut sysroot_candidates = vec![filesearch::get_or_default_sysroot()];
298 let path = current_dll_path()
299 .and_then(|s| s.canonicalize().ok());
300 if let Some(dll) = path {
301 // use `parent` twice to chop off the file name and then also the
302 // directory containing the dll which should be either `lib` or `bin`.
303 if let Some(path) = dll.parent().and_then(|p| p.parent()) {
304 // The original `path` pointed at the `rustc_driver` crate's dll.
305 // Now that dll should only be in one of two locations. The first is
306 // in the compiler's libdir, for example `$sysroot/lib/*.dll`. The
307 // other is the target's libdir, for example
308 // `$sysroot/lib/rustlib/$target/lib/*.dll`.
310 // We don't know which, so let's assume that if our `path` above
311 // ends in `$target` we *could* be in the target libdir, and always
312 // assume that we may be in the main libdir.
313 sysroot_candidates.push(path.to_owned());
315 if path.ends_with(target) {
316 sysroot_candidates.extend(path.parent() // chop off `$target`
317 .and_then(|p| p.parent()) // chop off `rustlib`
318 .and_then(|p| p.parent()) // chop off `lib`
319 .map(|s| s.to_owned()));
324 let sysroot = sysroot_candidates.iter()
326 let libdir = filesearch::relative_target_lib_path(&sysroot, &target);
328 .with_file_name(option_env!("CFG_CODEGEN_BACKENDS_DIR")
329 .unwrap_or("codegen-backends"))
332 info!("codegen backend candidate: {}", f.display());
336 let sysroot = match sysroot {
339 let candidates = sysroot_candidates.iter()
340 .map(|p| p.display().to_string())
343 let err = format!("failed to find a `codegen-backends` folder \
344 in the sysroot candidates:\n* {}", candidates);
345 early_error(ErrorOutputType::default(), &err);
348 info!("probing {} for a codegen backend", sysroot.display());
350 let d = match sysroot.read_dir() {
353 let err = format!("failed to load default codegen backend, couldn't \
354 read `{}`: {}", sysroot.display(), e);
355 early_error(ErrorOutputType::default(), &err);
359 let mut file: Option<PathBuf> = None;
361 let expected_name = format!("rustc_codegen_llvm-{}", backend_name);
362 for entry in d.filter_map(|e| e.ok()) {
363 let path = entry.path();
364 let filename = match path.file_name().and_then(|s| s.to_str()) {
368 if !(filename.starts_with(DLL_PREFIX) && filename.ends_with(DLL_SUFFIX)) {
371 let name = &filename[DLL_PREFIX.len() .. filename.len() - DLL_SUFFIX.len()];
372 if name != expected_name {
375 if let Some(ref prev) = file {
376 let err = format!("duplicate codegen backends found\n\
379 ", prev.display(), path.display());
380 early_error(ErrorOutputType::default(), &err);
382 file = Some(path.clone());
386 Some(ref s) => return load_backend_from_dylib(s),
388 let err = format!("failed to load default codegen backend for `{}`, \
389 no appropriate codegen dylib found in `{}`",
390 backend_name, sysroot.display());
391 early_error(ErrorOutputType::default(), &err);
396 fn current_dll_path() -> Option<PathBuf> {
397 use std::ffi::{OsStr, CStr};
398 use std::os::unix::prelude::*;
401 let addr = current_dll_path as usize as *mut _;
402 let mut info = mem::zeroed();
403 if libc::dladdr(addr, &mut info) == 0 {
404 info!("dladdr failed");
407 if info.dli_fname.is_null() {
408 info!("dladdr returned null pointer");
411 let bytes = CStr::from_ptr(info.dli_fname).to_bytes();
412 let os = OsStr::from_bytes(bytes);
413 Some(PathBuf::from(os))
418 fn current_dll_path() -> Option<PathBuf> {
419 use std::ffi::OsString;
420 use std::os::windows::prelude::*;
423 fn GetModuleHandleExW(dwFlags: u32,
425 phModule: *mut usize) -> i32;
426 fn GetModuleFileNameW(hModule: usize,
427 lpFilename: *mut u16,
431 const GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS: u32 = 0x00000004;
435 let r = GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
436 current_dll_path as usize,
439 info!("GetModuleHandleExW failed: {}", io::Error::last_os_error());
442 let mut space = Vec::with_capacity(1024);
443 let r = GetModuleFileNameW(module,
445 space.capacity() as u32);
447 info!("GetModuleFileNameW failed: {}", io::Error::last_os_error());
451 if r >= space.capacity() {
452 info!("our buffer was too small? {}",
453 io::Error::last_os_error());
457 let os = OsString::from_wide(&space);
458 Some(PathBuf::from(os))
463 // Parse args and run the compiler. This is the primary entry point for rustc.
464 // See comments on CompilerCalls below for details about the callbacks argument.
465 // The FileLoader provides a way to load files from sources other than the file system.
466 pub fn run_compiler<'a>(args: &[String],
467 callbacks: Box<dyn CompilerCalls<'a> + sync::Send + 'a>,
468 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
469 emitter_dest: Option<Box<dyn Write + Send>>)
470 -> (CompileResult, Option<Session>)
472 syntax::with_globals(|| {
473 let matches = match handle_options(args) {
474 Some(matches) => matches,
475 None => return (Ok(()), None),
478 let (sopts, cfg) = config::build_session_options_and_crate_config(&matches);
479 hygiene::set_default_edition(sopts.edition);
481 driver::spawn_thread_pool(sopts, |sopts| {
482 run_compiler_with_pool(matches, sopts, cfg, callbacks, file_loader, emitter_dest)
487 fn run_compiler_with_pool<'a>(
488 matches: getopts::Matches,
489 sopts: config::Options,
490 cfg: ast::CrateConfig,
491 mut callbacks: Box<dyn CompilerCalls<'a> + sync::Send + 'a>,
492 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
493 emitter_dest: Option<Box<dyn Write + Send>>
494 ) -> (CompileResult, Option<Session>) {
495 macro_rules! do_or_return {($expr: expr, $sess: expr) => {
497 Compilation::Stop => return (Ok(()), $sess),
498 Compilation::Continue => {}
502 let descriptions = diagnostics_registry();
504 do_or_return!(callbacks.early_callback(&matches,
511 let (odir, ofile) = make_output(&matches);
512 let (input, input_file_path, input_err) = match make_input(&matches.free) {
513 Some((input, input_file_path, input_err)) => {
514 let (input, input_file_path) = callbacks.some_input(input, input_file_path);
515 (input, input_file_path, input_err)
517 None => match callbacks.no_input(&matches, &sopts, &cfg, &odir, &ofile, &descriptions) {
518 Some((input, input_file_path)) => (input, input_file_path, None),
519 None => return (Ok(()), None),
523 let loader = file_loader.unwrap_or(box RealFileLoader);
524 let codemap = Lrc::new(CodeMap::with_file_loader(loader, sopts.file_path_mapping()));
525 let mut sess = session::build_session_with_codemap(
526 sopts, input_file_path.clone(), descriptions, codemap, emitter_dest,
529 if let Some(err) = input_err {
530 // Immediately stop compilation if there was an issue reading
531 // the input (for example if the input stream is not UTF-8).
532 sess.err(&err.to_string());
533 return (Err(CompileIncomplete::Stopped), Some(sess));
536 let codegen_backend = get_codegen_backend(&sess);
538 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
540 let mut cfg = config::build_configuration(&sess, cfg);
541 target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
542 sess.parse_sess.config = cfg;
545 let plugins = sess.opts.debugging_opts.extra_plugins.clone();
547 let cstore = CStore::new(codegen_backend.metadata_loader());
549 do_or_return!(callbacks.late_callback(&*codegen_backend,
555 &ofile), Some(sess));
557 let _sess_abort_error = OnDrop(|| sess.diagnostic().print_error_count());
559 let control = callbacks.build_controller(&sess, &matches);
561 driver::compile_input(codegen_backend,
576 pub fn set_sigpipe_handler() {
578 // Set the SIGPIPE signal handler, so that an EPIPE
579 // will cause rustc to terminate, as expected.
580 assert!(libc::signal(libc::SIGPIPE, libc::SIG_DFL) != libc::SIG_ERR);
585 pub fn set_sigpipe_handler() {}
587 // Extract output directory and file from matches.
588 fn make_output(matches: &getopts::Matches) -> (Option<PathBuf>, Option<PathBuf>) {
589 let odir = matches.opt_str("out-dir").map(|o| PathBuf::from(&o));
590 let ofile = matches.opt_str("o").map(|o| PathBuf::from(&o));
594 // Extract input (string or file and optional path) from matches.
595 fn make_input(free_matches: &[String]) -> Option<(Input, Option<PathBuf>, Option<io::Error>)> {
596 if free_matches.len() == 1 {
597 let ifile = &free_matches[0];
599 let mut src = String::new();
600 let err = if io::stdin().read_to_string(&mut src).is_err() {
601 Some(io::Error::new(io::ErrorKind::InvalidData,
602 "couldn't read from stdin, as it did not contain valid UTF-8"))
606 Some((Input::Str { name: FileName::Anon, input: src },
609 Some((Input::File(PathBuf::from(ifile)),
610 Some(PathBuf::from(ifile)), None))
617 fn parse_pretty(sess: &Session,
618 matches: &getopts::Matches)
619 -> Option<(PpMode, Option<UserIdentifiedItem>)> {
620 let pretty = if sess.opts.debugging_opts.unstable_options {
621 matches.opt_default("pretty", "normal").map(|a| {
622 // stable pretty-print variants only
623 pretty::parse_pretty(sess, &a, false)
629 if pretty.is_none() {
630 sess.opts.debugging_opts.unpretty.as_ref().map(|a| {
631 // extended with unstable pretty-print variants
632 pretty::parse_pretty(sess, &a, true)
639 // Whether to stop or continue compilation.
640 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
641 pub enum Compilation {
647 pub fn and_then<F: FnOnce() -> Compilation>(self, next: F) -> Compilation {
649 Compilation::Stop => Compilation::Stop,
650 Compilation::Continue => next(),
655 /// A trait for customising the compilation process. Offers a number of hooks for
656 /// executing custom code or customising input.
657 pub trait CompilerCalls<'a> {
658 /// Hook for a callback early in the process of handling arguments. This will
659 /// be called straight after options have been parsed but before anything
660 /// else (e.g., selecting input and output).
661 fn early_callback(&mut self,
662 _: &getopts::Matches,
664 _: &ast::CrateConfig,
665 _: &errors::registry::Registry,
668 Compilation::Continue
671 /// Hook for a callback late in the process of handling arguments. This will
672 /// be called just before actual compilation starts (and before build_controller
673 /// is called), after all arguments etc. have been completely handled.
674 fn late_callback(&mut self,
675 _: &dyn CodegenBackend,
676 _: &getopts::Matches,
683 Compilation::Continue
686 /// Called after we extract the input from the arguments. Gives the implementer
687 /// an opportunity to change the inputs or to add some custom input handling.
688 /// The default behaviour is to simply pass through the inputs.
689 fn some_input(&mut self,
691 input_path: Option<PathBuf>)
692 -> (Input, Option<PathBuf>) {
696 /// Called after we extract the input from the arguments if there is no valid
697 /// input. Gives the implementer an opportunity to supply alternate input (by
698 /// returning a Some value) or to add custom behaviour for this error such as
699 /// emitting error messages. Returning None will cause compilation to stop
701 fn no_input(&mut self,
702 _: &getopts::Matches,
704 _: &ast::CrateConfig,
707 _: &errors::registry::Registry)
708 -> Option<(Input, Option<PathBuf>)> {
712 // Create a CompilController struct for controlling the behaviour of
718 ) -> CompileController<'a>;
721 /// CompilerCalls instance for a regular rustc build.
722 #[derive(Copy, Clone)]
723 pub struct RustcDefaultCalls;
725 // FIXME remove these and use winapi 0.3 instead
726 // Duplicates: bootstrap/compile.rs, librustc_errors/emitter.rs
728 fn stdout_isatty() -> bool {
729 unsafe { libc::isatty(libc::STDOUT_FILENO) != 0 }
733 fn stdout_isatty() -> bool {
736 type HANDLE = *mut u8;
737 type LPDWORD = *mut u32;
738 const STD_OUTPUT_HANDLE: DWORD = -11i32 as DWORD;
740 fn GetStdHandle(which: DWORD) -> HANDLE;
741 fn GetConsoleMode(hConsoleHandle: HANDLE, lpMode: LPDWORD) -> BOOL;
744 let handle = GetStdHandle(STD_OUTPUT_HANDLE);
746 GetConsoleMode(handle, &mut out) != 0
750 fn handle_explain(code: &str,
751 descriptions: &errors::registry::Registry,
752 output: ErrorOutputType) {
753 let normalised = if code.starts_with("E") {
756 format!("E{0:0>4}", code)
758 match descriptions.find_description(&normalised) {
759 Some(ref description) => {
760 let mut is_in_code_block = false;
761 let mut text = String::new();
763 // Slice off the leading newline and print.
764 for line in description[1..].lines() {
765 let indent_level = line.find(|c: char| !c.is_whitespace())
766 .unwrap_or_else(|| line.len());
767 let dedented_line = &line[indent_level..];
768 if dedented_line.starts_with("```") {
769 is_in_code_block = !is_in_code_block;
770 text.push_str(&line[..(indent_level+3)]);
771 } else if is_in_code_block && dedented_line.starts_with("# ") {
780 show_content_with_pager(&text);
786 early_error(output, &format!("no extended information for {}", code));
791 fn show_content_with_pager(content: &String) {
792 let pager_name = env::var_os("PAGER").unwrap_or_else(|| if cfg!(windows) {
793 OsString::from("more.com")
795 OsString::from("less")
798 let mut fallback_to_println = false;
800 match Command::new(pager_name).stdin(Stdio::piped()).spawn() {
802 if let Some(pipe) = pager.stdin.as_mut() {
803 if pipe.write_all(content.as_bytes()).is_err() {
804 fallback_to_println = true;
808 if pager.wait().is_err() {
809 fallback_to_println = true;
813 fallback_to_println = true;
817 // If pager fails for whatever reason, we should still print the content
818 // to standard output
819 if fallback_to_println {
820 print!("{}", content);
824 impl<'a> CompilerCalls<'a> for RustcDefaultCalls {
825 fn early_callback(&mut self,
826 matches: &getopts::Matches,
828 _: &ast::CrateConfig,
829 descriptions: &errors::registry::Registry,
830 output: ErrorOutputType)
832 if let Some(ref code) = matches.opt_str("explain") {
833 handle_explain(code, descriptions, output);
834 return Compilation::Stop;
837 Compilation::Continue
840 fn no_input(&mut self,
841 matches: &getopts::Matches,
842 sopts: &config::Options,
843 cfg: &ast::CrateConfig,
844 odir: &Option<PathBuf>,
845 ofile: &Option<PathBuf>,
846 descriptions: &errors::registry::Registry)
847 -> Option<(Input, Option<PathBuf>)> {
848 match matches.free.len() {
850 let mut sess = build_session(sopts.clone(),
852 descriptions.clone());
853 if sopts.describe_lints {
854 let mut ls = lint::LintStore::new();
855 rustc_lint::register_builtins(&mut ls, Some(&sess));
856 describe_lints(&sess, &ls, false);
859 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
860 let mut cfg = config::build_configuration(&sess, cfg.clone());
861 let codegen_backend = get_codegen_backend(&sess);
862 target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
863 sess.parse_sess.config = cfg;
864 let should_stop = RustcDefaultCalls::print_crate_info(
872 if should_stop == Compilation::Stop {
875 early_error(sopts.error_format, "no input filename given");
877 1 => panic!("make_input should have provided valid inputs"),
878 _ => early_error(sopts.error_format, "multiple input filenames provided"),
882 fn late_callback(&mut self,
883 codegen_backend: &dyn CodegenBackend,
884 matches: &getopts::Matches,
888 odir: &Option<PathBuf>,
889 ofile: &Option<PathBuf>)
891 RustcDefaultCalls::print_crate_info(codegen_backend, sess, Some(input), odir, ofile)
892 .and_then(|| RustcDefaultCalls::list_metadata(sess, cstore, matches, input))
895 fn build_controller(self: Box<Self>,
897 matches: &getopts::Matches)
898 -> CompileController<'a> {
899 let mut control = CompileController::basic();
901 control.keep_ast = sess.opts.debugging_opts.keep_ast;
902 control.continue_parse_after_error = sess.opts.debugging_opts.continue_parse_after_error;
904 if let Some((ppm, opt_uii)) = parse_pretty(sess, matches) {
905 if ppm.needs_ast_map(&opt_uii) {
906 control.after_hir_lowering.stop = Compilation::Stop;
908 control.after_parse.callback = box move |state| {
909 state.krate = Some(pretty::fold_crate(state.session,
910 state.krate.take().unwrap(),
913 control.after_hir_lowering.callback = box move |state| {
914 pretty::print_after_hir_lowering(state.session,
915 state.cstore.unwrap(),
916 state.hir_map.unwrap(),
917 state.analysis.unwrap(),
918 state.resolutions.unwrap(),
920 &state.expanded_crate.take().unwrap(),
921 state.crate_name.unwrap(),
923 state.arenas.unwrap(),
924 state.output_filenames.unwrap(),
929 control.after_parse.stop = Compilation::Stop;
931 control.after_parse.callback = box move |state| {
932 let krate = pretty::fold_crate(state.session, state.krate.take().unwrap(), ppm);
933 pretty::print_after_parsing(state.session,
944 if sess.opts.debugging_opts.parse_only ||
945 sess.opts.debugging_opts.show_span.is_some() ||
946 sess.opts.debugging_opts.ast_json_noexpand {
947 control.after_parse.stop = Compilation::Stop;
950 if sess.opts.debugging_opts.no_analysis ||
951 sess.opts.debugging_opts.ast_json {
952 control.after_hir_lowering.stop = Compilation::Stop;
955 if sess.opts.debugging_opts.save_analysis {
956 enable_save_analysis(&mut control);
959 if sess.print_fuel_crate.is_some() {
960 let old_callback = control.compilation_done.callback;
961 control.compilation_done.callback = box move |state| {
963 let sess = state.session;
964 println!("Fuel used by {}: {}",
965 sess.print_fuel_crate.as_ref().unwrap(),
966 sess.print_fuel.get());
973 pub fn enable_save_analysis(control: &mut CompileController) {
974 control.keep_ast = true;
975 control.after_analysis.callback = box |state| {
976 time(state.session, "save analysis", || {
977 save::process_crate(state.tcx.unwrap(),
978 state.expanded_crate.unwrap(),
979 state.analysis.unwrap(),
980 state.crate_name.unwrap(),
982 DumpHandler::new(state.out_dir,
983 state.crate_name.unwrap()))
986 control.after_analysis.run_callback_on_error = true;
987 control.make_glob_map = resolve::MakeGlobMap::Yes;
990 impl RustcDefaultCalls {
991 pub fn list_metadata(sess: &Session,
993 matches: &getopts::Matches,
996 let r = matches.opt_strs("Z");
997 if r.contains(&("ls".to_string())) {
999 &Input::File(ref ifile) => {
1000 let path = &(*ifile);
1001 let mut v = Vec::new();
1002 locator::list_file_metadata(&sess.target.target,
1004 &*cstore.metadata_loader,
1007 println!("{}", String::from_utf8(v).unwrap());
1009 &Input::Str { .. } => {
1010 early_error(ErrorOutputType::default(), "cannot list metadata for stdin");
1013 return Compilation::Stop;
1016 return Compilation::Continue;
1020 fn print_crate_info(codegen_backend: &dyn CodegenBackend,
1022 input: Option<&Input>,
1023 odir: &Option<PathBuf>,
1024 ofile: &Option<PathBuf>)
1026 use rustc::session::config::PrintRequest::*;
1027 // PrintRequest::NativeStaticLibs is special - printed during linking
1028 // (empty iterator returns true)
1029 if sess.opts.prints.iter().all(|&p| p==PrintRequest::NativeStaticLibs) {
1030 return Compilation::Continue;
1033 let attrs = match input {
1036 let result = parse_crate_attrs(sess, input);
1038 Ok(attrs) => Some(attrs),
1039 Err(mut parse_error) => {
1041 return Compilation::Stop;
1046 for req in &sess.opts.prints {
1049 let mut targets = rustc_target::spec::get_targets().collect::<Vec<String>>();
1051 println!("{}", targets.join("\n"));
1053 Sysroot => println!("{}", sess.sysroot().display()),
1054 TargetSpec => println!("{}", sess.target.target.to_json().pretty()),
1055 FileNames | CrateName => {
1056 let input = match input {
1057 Some(input) => input,
1058 None => early_error(ErrorOutputType::default(), "no input file provided"),
1060 let attrs = attrs.as_ref().unwrap();
1061 let t_outputs = driver::build_output_filenames(input, odir, ofile, attrs, sess);
1062 let id = rustc_codegen_utils::link::find_crate_name(Some(sess), attrs, input);
1063 if *req == PrintRequest::CrateName {
1067 let crate_types = driver::collect_crate_types(sess, attrs);
1068 for &style in &crate_types {
1069 let fname = rustc_codegen_utils::link::filename_for_input(
1078 .to_string_lossy());
1082 let allow_unstable_cfg = UnstableFeatures::from_environment()
1083 .is_nightly_build();
1085 let mut cfgs = Vec::new();
1086 for &(name, ref value) in sess.parse_sess.config.iter() {
1087 let gated_cfg = GatedCfg::gate(&ast::MetaItem {
1088 ident: ast::Path::from_ident(ast::Ident::with_empty_ctxt(name)),
1089 node: ast::MetaItemKind::Word,
1093 // Note that crt-static is a specially recognized cfg
1094 // directive that's printed out here as part of
1095 // rust-lang/rust#37406, but in general the
1096 // `target_feature` cfg is gated under
1097 // rust-lang/rust#29717. For now this is just
1098 // specifically allowing the crt-static cfg and that's
1099 // it, this is intended to get into Cargo and then go
1100 // through to build scripts.
1101 let value = value.as_ref().map(|s| s.as_str());
1102 let value = value.as_ref().map(|s| s.as_ref());
1103 if name != "target_feature" || value != Some("crt-static") {
1104 if !allow_unstable_cfg && gated_cfg.is_some() {
1109 cfgs.push(if let Some(value) = value {
1110 format!("{}=\"{}\"", name, value)
1118 println!("{}", cfg);
1121 RelocationModels | CodeModels | TlsModels | TargetCPUs | TargetFeatures => {
1122 codegen_backend.print(*req, sess);
1124 // Any output here interferes with Cargo's parsing of other printed output
1125 PrintRequest::NativeStaticLibs => {}
1128 return Compilation::Stop;
1132 /// Returns a version string such as "0.12.0-dev".
1133 fn release_str() -> Option<&'static str> {
1134 option_env!("CFG_RELEASE")
1137 /// Returns the full SHA1 hash of HEAD of the Git repo from which rustc was built.
1138 fn commit_hash_str() -> Option<&'static str> {
1139 option_env!("CFG_VER_HASH")
1142 /// Returns the "commit date" of HEAD of the Git repo from which rustc was built as a static string.
1143 fn commit_date_str() -> Option<&'static str> {
1144 option_env!("CFG_VER_DATE")
1147 /// Prints version information
1148 pub fn version(binary: &str, matches: &getopts::Matches) {
1149 let verbose = matches.opt_present("verbose");
1153 option_env!("CFG_VERSION").unwrap_or("unknown version"));
1155 fn unw(x: Option<&str>) -> &str {
1156 x.unwrap_or("unknown")
1158 println!("binary: {}", binary);
1159 println!("commit-hash: {}", unw(commit_hash_str()));
1160 println!("commit-date: {}", unw(commit_date_str()));
1161 println!("host: {}", config::host_triple());
1162 println!("release: {}", unw(release_str()));
1163 get_codegen_sysroot("llvm")().print_version();
1167 fn usage(verbose: bool, include_unstable_options: bool) {
1168 let groups = if verbose {
1169 config::rustc_optgroups()
1171 config::rustc_short_optgroups()
1173 let mut options = getopts::Options::new();
1174 for option in groups.iter().filter(|x| include_unstable_options || x.is_stable()) {
1175 (option.apply)(&mut options);
1177 let message = "Usage: rustc [OPTIONS] INPUT".to_string();
1178 let nightly_help = if nightly_options::is_nightly_build() {
1179 "\n -Z help Print internal options for debugging rustc"
1183 let verbose_help = if verbose {
1186 "\n --help -v Print the full set of options rustc accepts"
1188 println!("{}\nAdditional help:
1189 -C help Print codegen options
1191 Print 'lint' options and default settings{}{}\n",
1192 options.usage(&message),
1197 fn print_wall_help() {
1199 The flag `-Wall` does not exist in `rustc`. Most useful lints are enabled by
1200 default. Use `rustc -W help` to see all available lints. It's more common to put
1201 warning settings in the crate root using `#![warn(LINT_NAME)]` instead of using
1202 the command line flag directly.
1206 fn describe_lints(sess: &Session, lint_store: &lint::LintStore, loaded_plugins: bool) {
1208 Available lint options:
1209 -W <foo> Warn about <foo>
1213 -F <foo> Forbid <foo> \
1214 (deny <foo> and all attempts to override)
1218 fn sort_lints(sess: &Session, lints: Vec<(&'static Lint, bool)>) -> Vec<&'static Lint> {
1219 let mut lints: Vec<_> = lints.into_iter().map(|(x, _)| x).collect();
1220 // The sort doesn't case-fold but it's doubtful we care.
1221 lints.sort_by_cached_key(|x: &&Lint| (x.default_level(sess), x.name));
1225 fn sort_lint_groups(lints: Vec<(&'static str, Vec<lint::LintId>, bool)>)
1226 -> Vec<(&'static str, Vec<lint::LintId>)> {
1227 let mut lints: Vec<_> = lints.into_iter().map(|(x, y, _)| (x, y)).collect();
1228 lints.sort_by_key(|l| l.0);
1232 let (plugin, builtin): (Vec<_>, _) = lint_store.get_lints()
1235 .partition(|&(_, p)| p);
1236 let plugin = sort_lints(sess, plugin);
1237 let builtin = sort_lints(sess, builtin);
1239 let (plugin_groups, builtin_groups): (Vec<_>, _) = lint_store.get_lint_groups()
1242 .partition(|&(.., p)| p);
1243 let plugin_groups = sort_lint_groups(plugin_groups);
1244 let builtin_groups = sort_lint_groups(builtin_groups);
1246 let max_name_len = plugin.iter()
1248 .map(|&s| s.name.chars().count())
1251 let padded = |x: &str| {
1252 let mut s = " ".repeat(max_name_len - x.chars().count());
1257 println!("Lint checks provided by rustc:\n");
1258 println!(" {} {:7.7} {}", padded("name"), "default", "meaning");
1259 println!(" {} {:7.7} {}", padded("----"), "-------", "-------");
1261 let print_lints = |lints: Vec<&Lint>| {
1263 let name = lint.name_lower().replace("_", "-");
1264 println!(" {} {:7.7} {}",
1266 lint.default_level.as_str(),
1272 print_lints(builtin);
1276 let max_name_len = max("warnings".len(),
1277 plugin_groups.iter()
1278 .chain(&builtin_groups)
1279 .map(|&(s, _)| s.chars().count())
1283 let padded = |x: &str| {
1284 let mut s = " ".repeat(max_name_len - x.chars().count());
1289 println!("Lint groups provided by rustc:\n");
1290 println!(" {} {}", padded("name"), "sub-lints");
1291 println!(" {} {}", padded("----"), "---------");
1292 println!(" {} {}", padded("warnings"), "all lints that are set to issue warnings");
1294 let print_lint_groups = |lints: Vec<(&'static str, Vec<lint::LintId>)>| {
1295 for (name, to) in lints {
1296 let name = name.to_lowercase().replace("_", "-");
1297 let desc = to.into_iter()
1298 .map(|x| x.to_string().replace("_", "-"))
1299 .collect::<Vec<String>>()
1301 println!(" {} {}", padded(&name), desc);
1306 print_lint_groups(builtin_groups);
1308 match (loaded_plugins, plugin.len(), plugin_groups.len()) {
1309 (false, 0, _) | (false, _, 0) => {
1310 println!("Compiler plugins can provide additional lints and lint groups. To see a \
1311 listing of these, re-run `rustc -W help` with a crate filename.");
1313 (false, ..) => panic!("didn't load lint plugins but got them anyway!"),
1314 (true, 0, 0) => println!("This crate does not load any lint plugins or lint groups."),
1317 println!("Lint checks provided by plugins loaded by this crate:\n");
1318 print_lints(plugin);
1321 println!("Lint groups provided by plugins loaded by this crate:\n");
1322 print_lint_groups(plugin_groups);
1328 fn describe_debug_flags() {
1329 println!("\nAvailable debug options:\n");
1330 print_flag_list("-Z", config::DB_OPTIONS);
1333 fn describe_codegen_flags() {
1334 println!("\nAvailable codegen options:\n");
1335 print_flag_list("-C", config::CG_OPTIONS);
1338 fn print_flag_list<T>(cmdline_opt: &str,
1339 flag_list: &[(&'static str, T, Option<&'static str>, &'static str)]) {
1340 let max_len = flag_list.iter()
1341 .map(|&(name, _, opt_type_desc, _)| {
1342 let extra_len = match opt_type_desc {
1346 name.chars().count() + extra_len
1351 for &(name, _, opt_type_desc, desc) in flag_list {
1352 let (width, extra) = match opt_type_desc {
1353 Some(..) => (max_len - 4, "=val"),
1354 None => (max_len, ""),
1356 println!(" {} {:>width$}{} -- {}",
1358 name.replace("_", "-"),
1365 /// Process command line options. Emits messages as appropriate. If compilation
1366 /// should continue, returns a getopts::Matches object parsed from args,
1367 /// otherwise returns None.
1369 /// The compiler's handling of options is a little complicated as it ties into
1370 /// our stability story, and it's even *more* complicated by historical
1371 /// accidents. The current intention of each compiler option is to have one of
1374 /// 1. An option is stable and can be used everywhere.
1375 /// 2. An option is unstable, but was historically allowed on the stable
1377 /// 3. An option is unstable, and can only be used on nightly.
1379 /// Like unstable library and language features, however, unstable options have
1380 /// always required a form of "opt in" to indicate that you're using them. This
1381 /// provides the easy ability to scan a code base to check to see if anything
1382 /// unstable is being used. Currently, this "opt in" is the `-Z` "zed" flag.
1384 /// All options behind `-Z` are considered unstable by default. Other top-level
1385 /// options can also be considered unstable, and they were unlocked through the
1386 /// `-Z unstable-options` flag. Note that `-Z` remains to be the root of
1387 /// instability in both cases, though.
1389 /// So with all that in mind, the comments below have some more detail about the
1390 /// contortions done here to get things to work out correctly.
1391 pub fn handle_options(args: &[String]) -> Option<getopts::Matches> {
1392 // Throw away the first argument, the name of the binary
1393 let args = &args[1..];
1395 if args.is_empty() {
1396 // user did not write `-v` nor `-Z unstable-options`, so do not
1397 // include that extra information.
1398 usage(false, false);
1402 // Parse with *all* options defined in the compiler, we don't worry about
1403 // option stability here we just want to parse as much as possible.
1404 let mut options = getopts::Options::new();
1405 for option in config::rustc_optgroups() {
1406 (option.apply)(&mut options);
1408 let matches = match options.parse(args) {
1410 Err(f) => early_error(ErrorOutputType::default(), &f.to_string()),
1413 // For all options we just parsed, we check a few aspects:
1415 // * If the option is stable, we're all good
1416 // * If the option wasn't passed, we're all good
1417 // * If `-Z unstable-options` wasn't passed (and we're not a -Z option
1418 // ourselves), then we require the `-Z unstable-options` flag to unlock
1419 // this option that was passed.
1420 // * If we're a nightly compiler, then unstable options are now unlocked, so
1421 // we're good to go.
1422 // * Otherwise, if we're a truly unstable option then we generate an error
1423 // (unstable option being used on stable)
1424 // * If we're a historically stable-but-should-be-unstable option then we
1425 // emit a warning that we're going to turn this into an error soon.
1426 nightly_options::check_nightly_options(&matches, &config::rustc_optgroups());
1428 if matches.opt_present("h") || matches.opt_present("help") {
1429 // Only show unstable options in --help if we *really* accept unstable
1430 // options, which catches the case where we got `-Z unstable-options` on
1431 // the stable channel of Rust which was accidentally allowed
1433 usage(matches.opt_present("verbose"),
1434 nightly_options::is_unstable_enabled(&matches));
1438 // Handle the special case of -Wall.
1439 let wall = matches.opt_strs("W");
1440 if wall.iter().any(|x| *x == "all") {
1445 // Don't handle -W help here, because we might first load plugins.
1446 let r = matches.opt_strs("Z");
1447 if r.iter().any(|x| *x == "help") {
1448 describe_debug_flags();
1452 let cg_flags = matches.opt_strs("C");
1453 if cg_flags.iter().any(|x| *x == "help") {
1454 describe_codegen_flags();
1458 if cg_flags.iter().any(|x| *x == "no-stack-check") {
1459 early_warn(ErrorOutputType::default(),
1460 "the --no-stack-check flag is deprecated and does nothing");
1463 if cg_flags.contains(&"passes=list".to_string()) {
1464 get_codegen_sysroot("llvm")().print_passes();
1468 if matches.opt_present("version") {
1469 version("rustc", &matches);
1476 fn parse_crate_attrs<'a>(sess: &'a Session, input: &Input) -> PResult<'a, Vec<ast::Attribute>> {
1478 Input::File(ref ifile) => {
1479 parse::parse_crate_attrs_from_file(ifile, &sess.parse_sess)
1481 Input::Str { ref name, ref input } => {
1482 parse::parse_crate_attrs_from_source_str(name.clone(),
1489 /// Runs `f` in a suitable thread for running `rustc`; returns a `Result` with either the return
1490 /// value of `f` or -- if a panic occurs -- the panic value.
1492 /// This version applies the given name to the thread. This is used by rustdoc to ensure consistent
1493 /// doctest output across platforms and executions.
1494 pub fn in_named_rustc_thread<F, R>(name: String, f: F) -> Result<R, Box<dyn Any + Send>>
1495 where F: FnOnce() -> R + Send + 'static,
1498 // Temporarily have stack size set to 16MB to deal with nom-using crates failing
1499 const STACK_SIZE: usize = 16 * 1024 * 1024; // 16MB
1501 #[cfg(all(unix,not(target_os = "haiku")))]
1502 let spawn_thread = unsafe {
1503 // Fetch the current resource limits
1504 let mut rlim = libc::rlimit {
1508 if libc::getrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1509 let err = io::Error::last_os_error();
1510 error!("in_rustc_thread: error calling getrlimit: {}", err);
1512 } else if rlim.rlim_max < STACK_SIZE as libc::rlim_t {
1515 std::rt::deinit_stack_guard();
1516 rlim.rlim_cur = STACK_SIZE as libc::rlim_t;
1517 if libc::setrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1518 let err = io::Error::last_os_error();
1519 error!("in_rustc_thread: error calling setrlimit: {}", err);
1520 std::rt::update_stack_guard();
1523 std::rt::update_stack_guard();
1529 // We set the stack size at link time. See src/rustc/rustc.rs.
1531 let spawn_thread = false;
1533 #[cfg(target_os = "haiku")]
1534 let spawn_thread = unsafe {
1535 // Haiku does not have setrlimit implemented for the stack size.
1536 // By default it does have the 16 MB stack limit, but we check this in
1537 // case the minimum STACK_SIZE changes or Haiku's defaults change.
1538 let mut rlim = libc::rlimit {
1542 if libc::getrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1543 let err = io::Error::last_os_error();
1544 error!("in_rustc_thread: error calling getrlimit: {}", err);
1546 } else if rlim.rlim_cur >= STACK_SIZE {
1553 #[cfg(not(any(windows,unix)))]
1554 let spawn_thread = true;
1556 // The or condition is added from backward compatibility.
1557 if spawn_thread || env::var_os("RUST_MIN_STACK").is_some() {
1558 let mut cfg = thread::Builder::new().name(name);
1560 // FIXME: Hacks on hacks. If the env is trying to override the stack size
1561 // then *don't* set it explicitly.
1562 if env::var_os("RUST_MIN_STACK").is_none() {
1563 cfg = cfg.stack_size(STACK_SIZE);
1566 let thread = cfg.spawn(f);
1567 thread.unwrap().join()
1569 let f = panic::AssertUnwindSafe(f);
1570 panic::catch_unwind(f)
1574 /// Runs `f` in a suitable thread for running `rustc`; returns a
1575 /// `Result` with either the return value of `f` or -- if a panic
1576 /// occurs -- the panic value.
1577 pub fn in_rustc_thread<F, R>(f: F) -> Result<R, Box<dyn Any + Send>>
1578 where F: FnOnce() -> R + Send + 'static,
1581 in_named_rustc_thread("rustc".to_string(), f)
1584 /// Get a list of extra command-line flags provided by the user, as strings.
1586 /// This function is used during ICEs to show more information useful for
1587 /// debugging, since some ICEs only happens with non-default compiler flags
1588 /// (and the users don't always report them).
1589 fn extra_compiler_flags() -> Option<(Vec<String>, bool)> {
1590 let args = env::args_os().map(|arg| arg.to_string_lossy().to_string()).collect::<Vec<_>>();
1592 // Avoid printing help because of empty args. This can suggest the compiler
1593 // itself is not the program root (consider RLS).
1598 let matches = if let Some(matches) = handle_options(&args) {
1604 let mut result = Vec::new();
1605 let mut excluded_cargo_defaults = false;
1606 for flag in ICE_REPORT_COMPILER_FLAGS {
1607 let prefix = if flag.len() == 1 { "-" } else { "--" };
1609 for content in &matches.opt_strs(flag) {
1610 // Split always returns the first element
1611 let name = if let Some(first) = content.split('=').next() {
1617 let content = if ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE.contains(&name) {
1623 if !ICE_REPORT_COMPILER_FLAGS_EXCLUDE.contains(&name) {
1624 result.push(format!("{}{} {}", prefix, flag, content));
1626 excluded_cargo_defaults = true;
1631 if result.len() > 0 {
1632 Some((result, excluded_cargo_defaults))
1639 pub struct CompilationFailure;
1641 impl Error for CompilationFailure {}
1643 impl Display for CompilationFailure {
1644 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1645 write!(f, "compilation had errors")
1649 /// Run a procedure which will detect panics in the compiler and print nicer
1650 /// error messages rather than just failing the test.
1652 /// The diagnostic emitter yielded to the procedure should be used for reporting
1653 /// errors of the compiler.
1654 pub fn monitor<F: FnOnce() + Send + 'static>(f: F) -> Result<(), CompilationFailure> {
1655 in_rustc_thread(move || {
1657 }).map_err(|value| {
1658 if value.is::<errors::FatalErrorMarker>() {
1661 // Thread panicked without emitting a fatal diagnostic
1665 Box::new(errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
1669 let handler = errors::Handler::with_emitter(true, false, emitter);
1671 // a .span_bug or .bug call has already printed what
1672 // it wants to print.
1673 if !value.is::<errors::ExplicitBug>() {
1674 handler.emit(&MultiSpan::new(),
1676 errors::Level::Bug);
1680 "the compiler unexpectedly panicked. this is a bug.".to_string(),
1681 format!("we would appreciate a bug report: {}", BUG_REPORT_URL),
1682 format!("rustc {} running on {}",
1683 option_env!("CFG_VERSION").unwrap_or("unknown_version"),
1684 config::host_triple()),
1687 if let Some((flags, excluded_cargo_defaults)) = extra_compiler_flags() {
1688 xs.push(format!("compiler flags: {}", flags.join(" ")));
1690 if excluded_cargo_defaults {
1691 xs.push("some of the compiler flags provided by cargo are hidden".to_string());
1696 handler.emit(&MultiSpan::new(),
1698 errors::Level::Note);
1701 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
1706 pub fn diagnostics_registry() -> errors::registry::Registry {
1707 use errors::registry::Registry;
1709 let mut all_errors = Vec::new();
1710 all_errors.extend_from_slice(&rustc::DIAGNOSTICS);
1711 all_errors.extend_from_slice(&rustc_typeck::DIAGNOSTICS);
1712 all_errors.extend_from_slice(&rustc_resolve::DIAGNOSTICS);
1713 all_errors.extend_from_slice(&rustc_privacy::DIAGNOSTICS);
1714 // FIXME: need to figure out a way to get these back in here
1715 // all_errors.extend_from_slice(get_codegen_backend(sess).diagnostics());
1716 all_errors.extend_from_slice(&rustc_codegen_utils::DIAGNOSTICS);
1717 all_errors.extend_from_slice(&rustc_metadata::DIAGNOSTICS);
1718 all_errors.extend_from_slice(&rustc_passes::DIAGNOSTICS);
1719 all_errors.extend_from_slice(&rustc_plugin::DIAGNOSTICS);
1720 all_errors.extend_from_slice(&rustc_mir::DIAGNOSTICS);
1721 all_errors.extend_from_slice(&syntax::DIAGNOSTICS);
1723 Registry::new(&all_errors)
1726 /// This allows tools to enable rust logging without having to magically match rustc's
1727 /// log crate version
1728 pub fn init_rustc_env_logger() {
1733 init_rustc_env_logger();
1734 let result = run(|| {
1735 let args = env::args_os().enumerate()
1736 .map(|(i, arg)| arg.into_string().unwrap_or_else(|arg| {
1737 early_error(ErrorOutputType::default(),
1738 &format!("Argument {} is not valid Unicode: {:?}", i, arg))
1740 .collect::<Vec<_>>();
1742 Box::new(RustcDefaultCalls),
1746 process::exit(result as i32);