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::middle::cstore::CrateStore;
82 use rustc_metadata::locator;
83 use rustc_metadata::cstore::CStore;
84 use rustc_metadata::dynamic_lib::DynamicLibrary;
85 use rustc::util::common::{time, ErrorReported};
86 use rustc_codegen_utils::codegen_backend::CodegenBackend;
88 use serialize::json::ToJson;
92 use std::default::Default;
93 use std::env::consts::{DLL_PREFIX, DLL_SUFFIX};
95 use std::error::Error;
96 use std::ffi::OsString;
97 use std::fmt::{self, Display};
98 use std::io::{self, Read, Write};
99 use std::iter::repeat;
102 use std::path::{PathBuf, Path};
103 use std::process::{self, Command, Stdio};
105 use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
106 use std::sync::{Once, ONCE_INIT};
110 use syntax::codemap::{CodeMap, FileLoader, RealFileLoader};
111 use syntax::feature_gate::{GatedCfg, UnstableFeatures};
112 use syntax::parse::{self, PResult};
113 use syntax_pos::{hygiene, DUMMY_SP, MultiSpan, FileName};
121 mod derive_registrar;
123 pub mod target_features {
125 use syntax::symbol::Symbol;
126 use rustc::session::Session;
127 use rustc_codegen_utils::codegen_backend::CodegenBackend;
129 /// Add `target_feature = "..."` cfgs for a variety of platform
130 /// specific features (SSE, NEON etc.).
132 /// This is performed by checking whether a whitelisted set of
133 /// features is available on the target machine, by querying LLVM.
134 pub fn add_configuration(cfg: &mut ast::CrateConfig,
136 codegen_backend: &dyn CodegenBackend) {
137 let tf = Symbol::intern("target_feature");
139 for feat in codegen_backend.target_features(sess) {
140 cfg.insert((tf, Some(feat)));
143 if sess.crt_static_feature() {
144 cfg.insert((tf, Some(Symbol::intern("crt-static"))));
149 /// Exit status code used for successful compilation and help output.
150 pub const EXIT_SUCCESS: isize = 0;
152 /// Exit status code used for compilation failures and invalid flags.
153 pub const EXIT_FAILURE: isize = 1;
155 const BUG_REPORT_URL: &'static str = "https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.\
158 const ICE_REPORT_COMPILER_FLAGS: &'static [&'static str] = &[
163 const ICE_REPORT_COMPILER_FLAGS_EXCLUDE: &'static [&'static str] = &[
167 const ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE: &'static [&'static str] = &[
171 pub fn abort_on_err<T>(result: Result<T, CompileIncomplete>, sess: &Session) -> T {
173 Err(CompileIncomplete::Errored(ErrorReported)) => {
174 sess.abort_if_errors();
175 panic!("error reported but abort_if_errors didn't abort???");
177 Err(CompileIncomplete::Stopped) => {
178 sess.fatal("compilation terminated");
184 pub fn run<F>(run_compiler: F) -> isize
185 where F: FnOnce() -> (CompileResult, Option<Session>) + Send + 'static
187 let result = monitor(move || {
188 let (result, session) = run_compiler();
189 if let Err(CompileIncomplete::Errored(_)) = result {
192 sess.abort_if_errors();
193 panic!("error reported but abort_if_errors didn't abort???");
197 errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
201 let handler = errors::Handler::with_emitter(true, false, Box::new(emitter));
202 handler.emit(&MultiSpan::new(),
203 "aborting due to previous error(s)",
204 errors::Level::Fatal);
205 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
212 Ok(()) => EXIT_SUCCESS,
213 Err(_) => EXIT_FAILURE,
217 fn load_backend_from_dylib(path: &Path) -> fn() -> Box<dyn CodegenBackend> {
218 // Note that we're specifically using `open_global_now` here rather than
219 // `open`, namely we want the behavior on Unix of RTLD_GLOBAL and RTLD_NOW,
220 // where NOW means "bind everything right now" because we don't want
221 // surprises later on and RTLD_GLOBAL allows the symbols to be made
222 // available for future dynamic libraries opened. This is currently used by
223 // loading LLVM and then making its symbols available for other dynamic
225 let lib = match DynamicLibrary::open_global_now(path) {
228 let err = format!("couldn't load codegen backend {:?}: {:?}",
231 early_error(ErrorOutputType::default(), &err);
235 match lib.symbol("__rustc_codegen_backend") {
238 mem::transmute::<*mut u8, _>(f)
241 let err = format!("couldn't load codegen backend as it \
242 doesn't export the `__rustc_codegen_backend` \
244 early_error(ErrorOutputType::default(), &err);
250 pub fn get_codegen_backend(sess: &Session) -> Box<dyn CodegenBackend> {
251 static INIT: Once = ONCE_INIT;
255 static mut LOAD: fn() -> Box<dyn CodegenBackend> = || unreachable!();
258 let codegen_name = sess.opts.debugging_opts.codegen_backend.as_ref()
259 .unwrap_or(&sess.target.target.options.codegen_backend);
260 let backend = match &codegen_name[..] {
262 rustc_codegen_utils::codegen_backend::MetadataOnlyCodegenBackend::new
264 filename if filename.contains(".") => {
265 load_backend_from_dylib(filename.as_ref())
267 codegen_name => get_codegen_sysroot(codegen_name),
274 let backend = unsafe { LOAD() };
279 fn get_codegen_sysroot(backend_name: &str) -> fn() -> Box<dyn CodegenBackend> {
280 // For now we only allow this function to be called once as it'll dlopen a
281 // few things, which seems to work best if we only do that once. In
282 // general this assertion never trips due to the once guard in `get_codegen_backend`,
283 // but there's a few manual calls to this function in this file we protect
285 static LOADED: AtomicBool = ATOMIC_BOOL_INIT;
286 assert!(!LOADED.fetch_or(true, Ordering::SeqCst),
287 "cannot load the default codegen backend twice");
289 // When we're compiling this library with `--test` it'll run as a binary but
290 // not actually exercise much functionality. As a result most of the logic
291 // here is defunkt (it assumes we're a dynamic library in a sysroot) so
292 // let's just return a dummy creation function which won't be used in
295 return rustc_codegen_utils::codegen_backend::MetadataOnlyCodegenBackend::new
298 let target = session::config::host_triple();
299 let mut sysroot_candidates = vec![filesearch::get_or_default_sysroot()];
300 let path = current_dll_path()
301 .and_then(|s| s.canonicalize().ok());
302 if let Some(dll) = path {
303 // use `parent` twice to chop off the file name and then also the
304 // directory containing the dll which should be either `lib` or `bin`.
305 if let Some(path) = dll.parent().and_then(|p| p.parent()) {
306 // The original `path` pointed at the `rustc_driver` crate's dll.
307 // Now that dll should only be in one of two locations. The first is
308 // in the compiler's libdir, for example `$sysroot/lib/*.dll`. The
309 // other is the target's libdir, for example
310 // `$sysroot/lib/rustlib/$target/lib/*.dll`.
312 // We don't know which, so let's assume that if our `path` above
313 // ends in `$target` we *could* be in the target libdir, and always
314 // assume that we may be in the main libdir.
315 sysroot_candidates.push(path.to_owned());
317 if path.ends_with(target) {
318 sysroot_candidates.extend(path.parent() // chop off `$target`
319 .and_then(|p| p.parent()) // chop off `rustlib`
320 .and_then(|p| p.parent()) // chop off `lib`
321 .map(|s| s.to_owned()));
326 let sysroot = sysroot_candidates.iter()
328 let libdir = filesearch::relative_target_lib_path(&sysroot, &target);
330 .with_file_name(option_env!("CFG_CODEGEN_BACKENDS_DIR")
331 .unwrap_or("codegen-backends"))
334 info!("codegen backend candidate: {}", f.display());
338 let sysroot = match sysroot {
341 let candidates = sysroot_candidates.iter()
342 .map(|p| p.display().to_string())
345 let err = format!("failed to find a `codegen-backends` folder \
346 in the sysroot candidates:\n* {}", candidates);
347 early_error(ErrorOutputType::default(), &err);
350 info!("probing {} for a codegen backend", sysroot.display());
352 let d = match sysroot.read_dir() {
355 let err = format!("failed to load default codegen backend, couldn't \
356 read `{}`: {}", sysroot.display(), e);
357 early_error(ErrorOutputType::default(), &err);
361 let mut file: Option<PathBuf> = None;
363 let expected_name = format!("rustc_codegen_llvm-{}", backend_name);
364 for entry in d.filter_map(|e| e.ok()) {
365 let path = entry.path();
366 let filename = match path.file_name().and_then(|s| s.to_str()) {
370 if !(filename.starts_with(DLL_PREFIX) && filename.ends_with(DLL_SUFFIX)) {
373 let name = &filename[DLL_PREFIX.len() .. filename.len() - DLL_SUFFIX.len()];
374 if name != expected_name {
377 if let Some(ref prev) = file {
378 let err = format!("duplicate codegen backends found\n\
381 ", prev.display(), path.display());
382 early_error(ErrorOutputType::default(), &err);
384 file = Some(path.clone());
388 Some(ref s) => return load_backend_from_dylib(s),
390 let err = format!("failed to load default codegen backend for `{}`, \
391 no appropriate codegen dylib found in `{}`",
392 backend_name, sysroot.display());
393 early_error(ErrorOutputType::default(), &err);
398 fn current_dll_path() -> Option<PathBuf> {
399 use std::ffi::{OsStr, CStr};
400 use std::os::unix::prelude::*;
403 let addr = current_dll_path as usize as *mut _;
404 let mut info = mem::zeroed();
405 if libc::dladdr(addr, &mut info) == 0 {
406 info!("dladdr failed");
409 if info.dli_fname.is_null() {
410 info!("dladdr returned null pointer");
413 let bytes = CStr::from_ptr(info.dli_fname).to_bytes();
414 let os = OsStr::from_bytes(bytes);
415 Some(PathBuf::from(os))
420 fn current_dll_path() -> Option<PathBuf> {
421 use std::ffi::OsString;
422 use std::os::windows::prelude::*;
425 fn GetModuleHandleExW(dwFlags: u32,
427 phModule: *mut usize) -> i32;
428 fn GetModuleFileNameW(hModule: usize,
429 lpFilename: *mut u16,
433 const GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS: u32 = 0x00000004;
437 let r = GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
438 current_dll_path as usize,
441 info!("GetModuleHandleExW failed: {}", io::Error::last_os_error());
444 let mut space = Vec::with_capacity(1024);
445 let r = GetModuleFileNameW(module,
447 space.capacity() as u32);
449 info!("GetModuleFileNameW failed: {}", io::Error::last_os_error());
453 if r >= space.capacity() {
454 info!("our buffer was too small? {}",
455 io::Error::last_os_error());
459 let os = OsString::from_wide(&space);
460 Some(PathBuf::from(os))
465 // Parse args and run the compiler. This is the primary entry point for rustc.
466 // See comments on CompilerCalls below for details about the callbacks argument.
467 // The FileLoader provides a way to load files from sources other than the file system.
468 pub fn run_compiler<'a>(args: &[String],
469 callbacks: Box<dyn CompilerCalls<'a> + sync::Send + 'a>,
470 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
471 emitter_dest: Option<Box<dyn Write + Send>>)
472 -> (CompileResult, Option<Session>)
474 syntax::with_globals(|| {
475 let matches = match handle_options(args) {
476 Some(matches) => matches,
477 None => return (Ok(()), None),
480 let (sopts, cfg) = config::build_session_options_and_crate_config(&matches);
481 hygiene::set_default_edition(sopts.edition);
483 driver::spawn_thread_pool(sopts, |sopts| {
484 run_compiler_with_pool(matches, sopts, cfg, callbacks, file_loader, emitter_dest)
489 fn run_compiler_with_pool<'a>(
490 matches: getopts::Matches,
491 sopts: config::Options,
492 cfg: ast::CrateConfig,
493 mut callbacks: Box<dyn CompilerCalls<'a> + sync::Send + 'a>,
494 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
495 emitter_dest: Option<Box<dyn Write + Send>>
496 ) -> (CompileResult, Option<Session>) {
497 macro_rules! do_or_return {($expr: expr, $sess: expr) => {
499 Compilation::Stop => return (Ok(()), $sess),
500 Compilation::Continue => {}
504 let descriptions = diagnostics_registry();
506 do_or_return!(callbacks.early_callback(&matches,
513 let (odir, ofile) = make_output(&matches);
514 let (input, input_file_path, input_err) = match make_input(&matches.free) {
515 Some((input, input_file_path, input_err)) => {
516 let (input, input_file_path) = callbacks.some_input(input, input_file_path);
517 (input, input_file_path, input_err)
519 None => match callbacks.no_input(&matches, &sopts, &cfg, &odir, &ofile, &descriptions) {
520 Some((input, input_file_path)) => (input, input_file_path, None),
521 None => return (Ok(()), None),
525 let loader = file_loader.unwrap_or(box RealFileLoader);
526 let codemap = Lrc::new(CodeMap::with_file_loader(loader, sopts.file_path_mapping()));
527 let mut sess = session::build_session_with_codemap(
528 sopts, input_file_path.clone(), descriptions, codemap, emitter_dest,
531 if let Some(err) = input_err {
532 // Immediately stop compilation if there was an issue reading
533 // the input (for example if the input stream is not UTF-8).
534 sess.err(&format!("{}", err));
535 return (Err(CompileIncomplete::Stopped), Some(sess));
538 let codegen_backend = get_codegen_backend(&sess);
540 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
542 let mut cfg = config::build_configuration(&sess, cfg);
543 target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
544 sess.parse_sess.config = cfg;
547 let plugins = sess.opts.debugging_opts.extra_plugins.clone();
549 let cstore = CStore::new(codegen_backend.metadata_loader());
551 do_or_return!(callbacks.late_callback(&*codegen_backend,
557 &ofile), Some(sess));
559 let _sess_abort_error = OnDrop(|| sess.diagnostic().print_error_count());
561 let control = callbacks.build_controller(&sess, &matches);
563 driver::compile_input(codegen_backend,
578 pub fn set_sigpipe_handler() {
580 // Set the SIGPIPE signal handler, so that an EPIPE
581 // will cause rustc to terminate, as expected.
582 assert!(libc::signal(libc::SIGPIPE, libc::SIG_DFL) != libc::SIG_ERR);
587 pub fn set_sigpipe_handler() {}
589 // Extract output directory and file from matches.
590 fn make_output(matches: &getopts::Matches) -> (Option<PathBuf>, Option<PathBuf>) {
591 let odir = matches.opt_str("out-dir").map(|o| PathBuf::from(&o));
592 let ofile = matches.opt_str("o").map(|o| PathBuf::from(&o));
596 // Extract input (string or file and optional path) from matches.
597 fn make_input(free_matches: &[String]) -> Option<(Input, Option<PathBuf>, Option<io::Error>)> {
598 if free_matches.len() == 1 {
599 let ifile = &free_matches[0];
601 let mut src = String::new();
602 let err = if io::stdin().read_to_string(&mut src).is_err() {
603 Some(io::Error::new(io::ErrorKind::InvalidData,
604 "couldn't read from stdin, as it did not contain valid UTF-8"))
608 Some((Input::Str { name: FileName::Anon, input: src },
611 Some((Input::File(PathBuf::from(ifile)),
612 Some(PathBuf::from(ifile)), None))
619 fn parse_pretty(sess: &Session,
620 matches: &getopts::Matches)
621 -> Option<(PpMode, Option<UserIdentifiedItem>)> {
622 let pretty = if sess.opts.debugging_opts.unstable_options {
623 matches.opt_default("pretty", "normal").map(|a| {
624 // stable pretty-print variants only
625 pretty::parse_pretty(sess, &a, false)
631 if pretty.is_none() {
632 sess.opts.debugging_opts.unpretty.as_ref().map(|a| {
633 // extended with unstable pretty-print variants
634 pretty::parse_pretty(sess, &a, true)
641 // Whether to stop or continue compilation.
642 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
643 pub enum Compilation {
649 pub fn and_then<F: FnOnce() -> Compilation>(self, next: F) -> Compilation {
651 Compilation::Stop => Compilation::Stop,
652 Compilation::Continue => next(),
657 /// A trait for customising the compilation process. Offers a number of hooks for
658 /// executing custom code or customising input.
659 pub trait CompilerCalls<'a> {
660 /// Hook for a callback early in the process of handling arguments. This will
661 /// be called straight after options have been parsed but before anything
662 /// else (e.g., selecting input and output).
663 fn early_callback(&mut self,
664 _: &getopts::Matches,
666 _: &ast::CrateConfig,
667 _: &errors::registry::Registry,
670 Compilation::Continue
673 /// Hook for a callback late in the process of handling arguments. This will
674 /// be called just before actual compilation starts (and before build_controller
675 /// is called), after all arguments etc. have been completely handled.
676 fn late_callback(&mut self,
677 _: &dyn CodegenBackend,
678 _: &getopts::Matches,
685 Compilation::Continue
688 /// Called after we extract the input from the arguments. Gives the implementer
689 /// an opportunity to change the inputs or to add some custom input handling.
690 /// The default behaviour is to simply pass through the inputs.
691 fn some_input(&mut self,
693 input_path: Option<PathBuf>)
694 -> (Input, Option<PathBuf>) {
698 /// Called after we extract the input from the arguments if there is no valid
699 /// input. Gives the implementer an opportunity to supply alternate input (by
700 /// returning a Some value) or to add custom behaviour for this error such as
701 /// emitting error messages. Returning None will cause compilation to stop
703 fn no_input(&mut self,
704 _: &getopts::Matches,
706 _: &ast::CrateConfig,
709 _: &errors::registry::Registry)
710 -> Option<(Input, Option<PathBuf>)> {
714 // Create a CompilController struct for controlling the behaviour of
720 ) -> CompileController<'a>;
723 /// CompilerCalls instance for a regular rustc build.
724 #[derive(Copy, Clone)]
725 pub struct RustcDefaultCalls;
727 // FIXME remove these and use winapi 0.3 instead
728 // Duplicates: bootstrap/compile.rs, librustc_errors/emitter.rs
730 fn stdout_isatty() -> bool {
731 unsafe { libc::isatty(libc::STDOUT_FILENO) != 0 }
735 fn stdout_isatty() -> bool {
738 type HANDLE = *mut u8;
739 type LPDWORD = *mut u32;
740 const STD_OUTPUT_HANDLE: DWORD = -11i32 as DWORD;
742 fn GetStdHandle(which: DWORD) -> HANDLE;
743 fn GetConsoleMode(hConsoleHandle: HANDLE, lpMode: LPDWORD) -> BOOL;
746 let handle = GetStdHandle(STD_OUTPUT_HANDLE);
748 GetConsoleMode(handle, &mut out) != 0
752 fn handle_explain(code: &str,
753 descriptions: &errors::registry::Registry,
754 output: ErrorOutputType) {
755 let normalised = if code.starts_with("E") {
758 format!("E{0:0>4}", code)
760 match descriptions.find_description(&normalised) {
761 Some(ref description) => {
762 let mut is_in_code_block = false;
763 let mut text = String::new();
765 // Slice off the leading newline and print.
766 for line in description[1..].lines() {
767 let indent_level = line.find(|c: char| !c.is_whitespace())
768 .unwrap_or_else(|| line.len());
769 let dedented_line = &line[indent_level..];
770 if dedented_line.starts_with("```") {
771 is_in_code_block = !is_in_code_block;
772 text.push_str(&line[..(indent_level+3)]);
773 } else if is_in_code_block && dedented_line.starts_with("# ") {
782 show_content_with_pager(&text);
788 early_error(output, &format!("no extended information for {}", code));
793 fn show_content_with_pager(content: &String) {
794 let pager_name = env::var_os("PAGER").unwrap_or_else(|| if cfg!(windows) {
795 OsString::from("more.com")
797 OsString::from("less")
800 let mut fallback_to_println = false;
802 match Command::new(pager_name).stdin(Stdio::piped()).spawn() {
804 if let Some(pipe) = pager.stdin.as_mut() {
805 if pipe.write_all(content.as_bytes()).is_err() {
806 fallback_to_println = true;
810 if pager.wait().is_err() {
811 fallback_to_println = true;
815 fallback_to_println = true;
819 // If pager fails for whatever reason, we should still print the content
820 // to standard output
821 if fallback_to_println {
822 print!("{}", content);
826 impl<'a> CompilerCalls<'a> for RustcDefaultCalls {
827 fn early_callback(&mut self,
828 matches: &getopts::Matches,
830 _: &ast::CrateConfig,
831 descriptions: &errors::registry::Registry,
832 output: ErrorOutputType)
834 if let Some(ref code) = matches.opt_str("explain") {
835 handle_explain(code, descriptions, output);
836 return Compilation::Stop;
839 Compilation::Continue
842 fn no_input(&mut self,
843 matches: &getopts::Matches,
844 sopts: &config::Options,
845 cfg: &ast::CrateConfig,
846 odir: &Option<PathBuf>,
847 ofile: &Option<PathBuf>,
848 descriptions: &errors::registry::Registry)
849 -> Option<(Input, Option<PathBuf>)> {
850 match matches.free.len() {
852 let mut sess = build_session(sopts.clone(),
854 descriptions.clone());
855 if sopts.describe_lints {
856 let mut ls = lint::LintStore::new();
857 rustc_lint::register_builtins(&mut ls, Some(&sess));
858 describe_lints(&sess, &ls, false);
861 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
862 let mut cfg = config::build_configuration(&sess, cfg.clone());
863 let codegen_backend = get_codegen_backend(&sess);
864 target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
865 sess.parse_sess.config = cfg;
866 let should_stop = RustcDefaultCalls::print_crate_info(
874 if should_stop == Compilation::Stop {
877 early_error(sopts.error_format, "no input filename given");
879 1 => panic!("make_input should have provided valid inputs"),
880 _ => early_error(sopts.error_format, "multiple input filenames provided"),
884 fn late_callback(&mut self,
885 codegen_backend: &dyn CodegenBackend,
886 matches: &getopts::Matches,
888 cstore: &dyn CrateStore,
890 odir: &Option<PathBuf>,
891 ofile: &Option<PathBuf>)
893 RustcDefaultCalls::print_crate_info(codegen_backend, sess, Some(input), odir, ofile)
894 .and_then(|| RustcDefaultCalls::list_metadata(sess, cstore, matches, input))
897 fn build_controller(self: Box<Self>,
899 matches: &getopts::Matches)
900 -> CompileController<'a> {
901 let mut control = CompileController::basic();
903 control.keep_ast = sess.opts.debugging_opts.keep_ast;
904 control.continue_parse_after_error = sess.opts.debugging_opts.continue_parse_after_error;
906 if let Some((ppm, opt_uii)) = parse_pretty(sess, matches) {
907 if ppm.needs_ast_map(&opt_uii) {
908 control.after_hir_lowering.stop = Compilation::Stop;
910 control.after_parse.callback = box move |state| {
911 state.krate = Some(pretty::fold_crate(state.session,
912 state.krate.take().unwrap(),
915 control.after_hir_lowering.callback = box move |state| {
916 pretty::print_after_hir_lowering(state.session,
917 state.cstore.unwrap(),
918 state.hir_map.unwrap(),
919 state.analysis.unwrap(),
920 state.resolutions.unwrap(),
922 &state.expanded_crate.take().unwrap(),
923 state.crate_name.unwrap(),
925 state.arenas.unwrap(),
926 state.output_filenames.unwrap(),
931 control.after_parse.stop = Compilation::Stop;
933 control.after_parse.callback = box move |state| {
934 let krate = pretty::fold_crate(state.session, state.krate.take().unwrap(), ppm);
935 pretty::print_after_parsing(state.session,
946 if sess.opts.debugging_opts.parse_only ||
947 sess.opts.debugging_opts.show_span.is_some() ||
948 sess.opts.debugging_opts.ast_json_noexpand {
949 control.after_parse.stop = Compilation::Stop;
952 if sess.opts.debugging_opts.no_analysis ||
953 sess.opts.debugging_opts.ast_json {
954 control.after_hir_lowering.stop = Compilation::Stop;
957 if sess.opts.debugging_opts.save_analysis {
958 enable_save_analysis(&mut control);
961 if sess.print_fuel_crate.is_some() {
962 let old_callback = control.compilation_done.callback;
963 control.compilation_done.callback = box move |state| {
965 let sess = state.session;
966 println!("Fuel used by {}: {}",
967 sess.print_fuel_crate.as_ref().unwrap(),
968 sess.print_fuel.get());
975 pub fn enable_save_analysis(control: &mut CompileController) {
976 control.keep_ast = true;
977 control.after_analysis.callback = box |state| {
978 time(state.session, "save analysis", || {
979 save::process_crate(state.tcx.unwrap(),
980 state.expanded_crate.unwrap(),
981 state.analysis.unwrap(),
982 state.crate_name.unwrap(),
984 DumpHandler::new(state.out_dir,
985 state.crate_name.unwrap()))
988 control.after_analysis.run_callback_on_error = true;
989 control.make_glob_map = resolve::MakeGlobMap::Yes;
992 impl RustcDefaultCalls {
993 pub fn list_metadata(sess: &Session,
994 cstore: &dyn CrateStore,
995 matches: &getopts::Matches,
998 let r = matches.opt_strs("Z");
999 if r.contains(&("ls".to_string())) {
1001 &Input::File(ref ifile) => {
1002 let path = &(*ifile);
1003 let mut v = Vec::new();
1004 locator::list_file_metadata(&sess.target.target,
1006 cstore.metadata_loader(),
1009 println!("{}", String::from_utf8(v).unwrap());
1011 &Input::Str { .. } => {
1012 early_error(ErrorOutputType::default(), "cannot list metadata for stdin");
1015 return Compilation::Stop;
1018 return Compilation::Continue;
1022 fn print_crate_info(codegen_backend: &dyn CodegenBackend,
1024 input: Option<&Input>,
1025 odir: &Option<PathBuf>,
1026 ofile: &Option<PathBuf>)
1028 use rustc::session::config::PrintRequest::*;
1029 // PrintRequest::NativeStaticLibs is special - printed during linking
1030 // (empty iterator returns true)
1031 if sess.opts.prints.iter().all(|&p| p==PrintRequest::NativeStaticLibs) {
1032 return Compilation::Continue;
1035 let attrs = match input {
1038 let result = parse_crate_attrs(sess, input);
1040 Ok(attrs) => Some(attrs),
1041 Err(mut parse_error) => {
1043 return Compilation::Stop;
1048 for req in &sess.opts.prints {
1051 let mut targets = rustc_target::spec::get_targets().collect::<Vec<String>>();
1053 println!("{}", targets.join("\n"));
1055 Sysroot => println!("{}", sess.sysroot().display()),
1056 TargetSpec => println!("{}", sess.target.target.to_json().pretty()),
1057 FileNames | CrateName => {
1058 let input = match input {
1059 Some(input) => input,
1060 None => early_error(ErrorOutputType::default(), "no input file provided"),
1062 let attrs = attrs.as_ref().unwrap();
1063 let t_outputs = driver::build_output_filenames(input, odir, ofile, attrs, sess);
1064 let id = rustc_codegen_utils::link::find_crate_name(Some(sess), attrs, input);
1065 if *req == PrintRequest::CrateName {
1069 let crate_types = driver::collect_crate_types(sess, attrs);
1070 for &style in &crate_types {
1071 let fname = rustc_codegen_utils::link::filename_for_input(
1080 .to_string_lossy());
1084 let allow_unstable_cfg = UnstableFeatures::from_environment()
1085 .is_nightly_build();
1087 let mut cfgs = Vec::new();
1088 for &(name, ref value) in sess.parse_sess.config.iter() {
1089 let gated_cfg = GatedCfg::gate(&ast::MetaItem {
1090 ident: ast::Path::from_ident(ast::Ident::with_empty_ctxt(name)),
1091 node: ast::MetaItemKind::Word,
1095 // Note that crt-static is a specially recognized cfg
1096 // directive that's printed out here as part of
1097 // rust-lang/rust#37406, but in general the
1098 // `target_feature` cfg is gated under
1099 // rust-lang/rust#29717. For now this is just
1100 // specifically allowing the crt-static cfg and that's
1101 // it, this is intended to get into Cargo and then go
1102 // through to build scripts.
1103 let value = value.as_ref().map(|s| s.as_str());
1104 let value = value.as_ref().map(|s| s.as_ref());
1105 if name != "target_feature" || value != Some("crt-static") {
1106 if !allow_unstable_cfg && gated_cfg.is_some() {
1111 cfgs.push(if let Some(value) = value {
1112 format!("{}=\"{}\"", name, value)
1120 println!("{}", cfg);
1123 RelocationModels | CodeModels | TlsModels | TargetCPUs | TargetFeatures => {
1124 codegen_backend.print(*req, sess);
1126 // Any output here interferes with Cargo's parsing of other printed output
1127 PrintRequest::NativeStaticLibs => {}
1130 return Compilation::Stop;
1134 /// Returns a version string such as "0.12.0-dev".
1135 fn release_str() -> Option<&'static str> {
1136 option_env!("CFG_RELEASE")
1139 /// Returns the full SHA1 hash of HEAD of the Git repo from which rustc was built.
1140 fn commit_hash_str() -> Option<&'static str> {
1141 option_env!("CFG_VER_HASH")
1144 /// Returns the "commit date" of HEAD of the Git repo from which rustc was built as a static string.
1145 fn commit_date_str() -> Option<&'static str> {
1146 option_env!("CFG_VER_DATE")
1149 /// Prints version information
1150 pub fn version(binary: &str, matches: &getopts::Matches) {
1151 let verbose = matches.opt_present("verbose");
1155 option_env!("CFG_VERSION").unwrap_or("unknown version"));
1157 fn unw(x: Option<&str>) -> &str {
1158 x.unwrap_or("unknown")
1160 println!("binary: {}", binary);
1161 println!("commit-hash: {}", unw(commit_hash_str()));
1162 println!("commit-date: {}", unw(commit_date_str()));
1163 println!("host: {}", config::host_triple());
1164 println!("release: {}", unw(release_str()));
1165 get_codegen_sysroot("llvm")().print_version();
1169 fn usage(verbose: bool, include_unstable_options: bool) {
1170 let groups = if verbose {
1171 config::rustc_optgroups()
1173 config::rustc_short_optgroups()
1175 let mut options = getopts::Options::new();
1176 for option in groups.iter().filter(|x| include_unstable_options || x.is_stable()) {
1177 (option.apply)(&mut options);
1179 let message = format!("Usage: rustc [OPTIONS] INPUT");
1180 let nightly_help = if nightly_options::is_nightly_build() {
1181 "\n -Z help Print internal options for debugging rustc"
1185 let verbose_help = if verbose {
1188 "\n --help -v Print the full set of options rustc accepts"
1190 println!("{}\nAdditional help:
1191 -C help Print codegen options
1193 Print 'lint' options and default settings{}{}\n",
1194 options.usage(&message),
1199 fn print_wall_help() {
1201 The flag `-Wall` does not exist in `rustc`. Most useful lints are enabled by
1202 default. Use `rustc -W help` to see all available lints. It's more common to put
1203 warning settings in the crate root using `#![warn(LINT_NAME)]` instead of using
1204 the command line flag directly.
1208 fn describe_lints(sess: &Session, lint_store: &lint::LintStore, loaded_plugins: bool) {
1210 Available lint options:
1211 -W <foo> Warn about <foo>
1215 -F <foo> Forbid <foo> \
1216 (deny <foo> and all attempts to override)
1220 fn sort_lints(sess: &Session, lints: Vec<(&'static Lint, bool)>) -> Vec<&'static Lint> {
1221 let mut lints: Vec<_> = lints.into_iter().map(|(x, _)| x).collect();
1222 // The sort doesn't case-fold but it's doubtful we care.
1223 lints.sort_by_cached_key(|x: &&Lint| (x.default_level(sess), x.name));
1227 fn sort_lint_groups(lints: Vec<(&'static str, Vec<lint::LintId>, bool)>)
1228 -> Vec<(&'static str, Vec<lint::LintId>)> {
1229 let mut lints: Vec<_> = lints.into_iter().map(|(x, y, _)| (x, y)).collect();
1230 lints.sort_by_key(|ref l| l.0);
1234 let (plugin, builtin): (Vec<_>, _) = lint_store.get_lints()
1237 .partition(|&(_, p)| p);
1238 let plugin = sort_lints(sess, plugin);
1239 let builtin = sort_lints(sess, builtin);
1241 let (plugin_groups, builtin_groups): (Vec<_>, _) = lint_store.get_lint_groups()
1244 .partition(|&(.., p)| p);
1245 let plugin_groups = sort_lint_groups(plugin_groups);
1246 let builtin_groups = sort_lint_groups(builtin_groups);
1248 let max_name_len = plugin.iter()
1250 .map(|&s| s.name.chars().count())
1253 let padded = |x: &str| {
1254 let mut s = repeat(" ")
1255 .take(max_name_len - x.chars().count())
1256 .collect::<String>();
1261 println!("Lint checks provided by rustc:\n");
1262 println!(" {} {:7.7} {}", padded("name"), "default", "meaning");
1263 println!(" {} {:7.7} {}", padded("----"), "-------", "-------");
1265 let print_lints = |lints: Vec<&Lint>| {
1267 let name = lint.name_lower().replace("_", "-");
1268 println!(" {} {:7.7} {}",
1270 lint.default_level.as_str(),
1276 print_lints(builtin);
1280 let max_name_len = max("warnings".len(),
1281 plugin_groups.iter()
1282 .chain(&builtin_groups)
1283 .map(|&(s, _)| s.chars().count())
1287 let padded = |x: &str| {
1288 let mut s = repeat(" ")
1289 .take(max_name_len - x.chars().count())
1290 .collect::<String>();
1295 println!("Lint groups provided by rustc:\n");
1296 println!(" {} {}", padded("name"), "sub-lints");
1297 println!(" {} {}", padded("----"), "---------");
1298 println!(" {} {}", padded("warnings"), "all lints that are set to issue warnings");
1300 let print_lint_groups = |lints: Vec<(&'static str, Vec<lint::LintId>)>| {
1301 for (name, to) in lints {
1302 let name = name.to_lowercase().replace("_", "-");
1303 let desc = to.into_iter()
1304 .map(|x| x.to_string().replace("_", "-"))
1305 .collect::<Vec<String>>()
1307 println!(" {} {}", padded(&name), desc);
1312 print_lint_groups(builtin_groups);
1314 match (loaded_plugins, plugin.len(), plugin_groups.len()) {
1315 (false, 0, _) | (false, _, 0) => {
1316 println!("Compiler plugins can provide additional lints and lint groups. To see a \
1317 listing of these, re-run `rustc -W help` with a crate filename.");
1319 (false, ..) => panic!("didn't load lint plugins but got them anyway!"),
1320 (true, 0, 0) => println!("This crate does not load any lint plugins or lint groups."),
1323 println!("Lint checks provided by plugins loaded by this crate:\n");
1324 print_lints(plugin);
1327 println!("Lint groups provided by plugins loaded by this crate:\n");
1328 print_lint_groups(plugin_groups);
1334 fn describe_debug_flags() {
1335 println!("\nAvailable debug options:\n");
1336 print_flag_list("-Z", config::DB_OPTIONS);
1339 fn describe_codegen_flags() {
1340 println!("\nAvailable codegen options:\n");
1341 print_flag_list("-C", config::CG_OPTIONS);
1344 fn print_flag_list<T>(cmdline_opt: &str,
1345 flag_list: &[(&'static str, T, Option<&'static str>, &'static str)]) {
1346 let max_len = flag_list.iter()
1347 .map(|&(name, _, opt_type_desc, _)| {
1348 let extra_len = match opt_type_desc {
1352 name.chars().count() + extra_len
1357 for &(name, _, opt_type_desc, desc) in flag_list {
1358 let (width, extra) = match opt_type_desc {
1359 Some(..) => (max_len - 4, "=val"),
1360 None => (max_len, ""),
1362 println!(" {} {:>width$}{} -- {}",
1364 name.replace("_", "-"),
1371 /// Process command line options. Emits messages as appropriate. If compilation
1372 /// should continue, returns a getopts::Matches object parsed from args,
1373 /// otherwise returns None.
1375 /// The compiler's handling of options is a little complicated as it ties into
1376 /// our stability story, and it's even *more* complicated by historical
1377 /// accidents. The current intention of each compiler option is to have one of
1380 /// 1. An option is stable and can be used everywhere.
1381 /// 2. An option is unstable, but was historically allowed on the stable
1383 /// 3. An option is unstable, and can only be used on nightly.
1385 /// Like unstable library and language features, however, unstable options have
1386 /// always required a form of "opt in" to indicate that you're using them. This
1387 /// provides the easy ability to scan a code base to check to see if anything
1388 /// unstable is being used. Currently, this "opt in" is the `-Z` "zed" flag.
1390 /// All options behind `-Z` are considered unstable by default. Other top-level
1391 /// options can also be considered unstable, and they were unlocked through the
1392 /// `-Z unstable-options` flag. Note that `-Z` remains to be the root of
1393 /// instability in both cases, though.
1395 /// So with all that in mind, the comments below have some more detail about the
1396 /// contortions done here to get things to work out correctly.
1397 pub fn handle_options(args: &[String]) -> Option<getopts::Matches> {
1398 // Throw away the first argument, the name of the binary
1399 let args = &args[1..];
1401 if args.is_empty() {
1402 // user did not write `-v` nor `-Z unstable-options`, so do not
1403 // include that extra information.
1404 usage(false, false);
1408 // Parse with *all* options defined in the compiler, we don't worry about
1409 // option stability here we just want to parse as much as possible.
1410 let mut options = getopts::Options::new();
1411 for option in config::rustc_optgroups() {
1412 (option.apply)(&mut options);
1414 let matches = match options.parse(args) {
1416 Err(f) => early_error(ErrorOutputType::default(), &f.to_string()),
1419 // For all options we just parsed, we check a few aspects:
1421 // * If the option is stable, we're all good
1422 // * If the option wasn't passed, we're all good
1423 // * If `-Z unstable-options` wasn't passed (and we're not a -Z option
1424 // ourselves), then we require the `-Z unstable-options` flag to unlock
1425 // this option that was passed.
1426 // * If we're a nightly compiler, then unstable options are now unlocked, so
1427 // we're good to go.
1428 // * Otherwise, if we're a truly unstable option then we generate an error
1429 // (unstable option being used on stable)
1430 // * If we're a historically stable-but-should-be-unstable option then we
1431 // emit a warning that we're going to turn this into an error soon.
1432 nightly_options::check_nightly_options(&matches, &config::rustc_optgroups());
1434 if matches.opt_present("h") || matches.opt_present("help") {
1435 // Only show unstable options in --help if we *really* accept unstable
1436 // options, which catches the case where we got `-Z unstable-options` on
1437 // the stable channel of Rust which was accidentally allowed
1439 usage(matches.opt_present("verbose"),
1440 nightly_options::is_unstable_enabled(&matches));
1444 // Handle the special case of -Wall.
1445 let wall = matches.opt_strs("W");
1446 if wall.iter().any(|x| *x == "all") {
1451 // Don't handle -W help here, because we might first load plugins.
1452 let r = matches.opt_strs("Z");
1453 if r.iter().any(|x| *x == "help") {
1454 describe_debug_flags();
1458 let cg_flags = matches.opt_strs("C");
1459 if cg_flags.iter().any(|x| *x == "help") {
1460 describe_codegen_flags();
1464 if cg_flags.iter().any(|x| *x == "no-stack-check") {
1465 early_warn(ErrorOutputType::default(),
1466 "the --no-stack-check flag is deprecated and does nothing");
1469 if cg_flags.contains(&"passes=list".to_string()) {
1470 get_codegen_sysroot("llvm")().print_passes();
1474 if matches.opt_present("version") {
1475 version("rustc", &matches);
1482 fn parse_crate_attrs<'a>(sess: &'a Session, input: &Input) -> PResult<'a, Vec<ast::Attribute>> {
1484 Input::File(ref ifile) => {
1485 parse::parse_crate_attrs_from_file(ifile, &sess.parse_sess)
1487 Input::Str { ref name, ref input } => {
1488 parse::parse_crate_attrs_from_source_str(name.clone(),
1495 /// Runs `f` in a suitable thread for running `rustc`; returns a `Result` with either the return
1496 /// value of `f` or -- if a panic occurs -- the panic value.
1498 /// This version applies the given name to the thread. This is used by rustdoc to ensure consistent
1499 /// doctest output across platforms and executions.
1500 pub fn in_named_rustc_thread<F, R>(name: String, f: F) -> Result<R, Box<dyn Any + Send>>
1501 where F: FnOnce() -> R + Send + 'static,
1504 // Temporarily have stack size set to 16MB to deal with nom-using crates failing
1505 const STACK_SIZE: usize = 16 * 1024 * 1024; // 16MB
1507 #[cfg(all(unix,not(target_os = "haiku")))]
1508 let spawn_thread = unsafe {
1509 // Fetch the current resource limits
1510 let mut rlim = libc::rlimit {
1514 if libc::getrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1515 let err = io::Error::last_os_error();
1516 error!("in_rustc_thread: error calling getrlimit: {}", err);
1518 } else if rlim.rlim_max < STACK_SIZE as libc::rlim_t {
1521 std::rt::deinit_stack_guard();
1522 rlim.rlim_cur = STACK_SIZE as libc::rlim_t;
1523 if libc::setrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1524 let err = io::Error::last_os_error();
1525 error!("in_rustc_thread: error calling setrlimit: {}", err);
1526 std::rt::update_stack_guard();
1529 std::rt::update_stack_guard();
1535 // We set the stack size at link time. See src/rustc/rustc.rs.
1537 let spawn_thread = false;
1539 #[cfg(target_os = "haiku")]
1540 let spawn_thread = unsafe {
1541 // Haiku does not have setrlimit implemented for the stack size.
1542 // By default it does have the 16 MB stack limit, but we check this in
1543 // case the minimum STACK_SIZE changes or Haiku's defaults change.
1544 let mut rlim = libc::rlimit {
1548 if libc::getrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1549 let err = io::Error::last_os_error();
1550 error!("in_rustc_thread: error calling getrlimit: {}", err);
1552 } else if rlim.rlim_cur >= STACK_SIZE {
1559 #[cfg(not(any(windows,unix)))]
1560 let spawn_thread = true;
1562 // The or condition is added from backward compatibility.
1563 if spawn_thread || env::var_os("RUST_MIN_STACK").is_some() {
1564 let mut cfg = thread::Builder::new().name(name);
1566 // FIXME: Hacks on hacks. If the env is trying to override the stack size
1567 // then *don't* set it explicitly.
1568 if env::var_os("RUST_MIN_STACK").is_none() {
1569 cfg = cfg.stack_size(STACK_SIZE);
1572 let thread = cfg.spawn(f);
1573 thread.unwrap().join()
1575 let f = panic::AssertUnwindSafe(f);
1576 panic::catch_unwind(f)
1580 /// Runs `f` in a suitable thread for running `rustc`; returns a
1581 /// `Result` with either the return value of `f` or -- if a panic
1582 /// occurs -- the panic value.
1583 pub fn in_rustc_thread<F, R>(f: F) -> Result<R, Box<dyn Any + Send>>
1584 where F: FnOnce() -> R + Send + 'static,
1587 in_named_rustc_thread("rustc".to_string(), f)
1590 /// Get a list of extra command-line flags provided by the user, as strings.
1592 /// This function is used during ICEs to show more information useful for
1593 /// debugging, since some ICEs only happens with non-default compiler flags
1594 /// (and the users don't always report them).
1595 fn extra_compiler_flags() -> Option<(Vec<String>, bool)> {
1596 let mut args = Vec::new();
1597 for arg in env::args_os() {
1598 args.push(arg.to_string_lossy().to_string());
1601 // Avoid printing help because of empty args. This can suggest the compiler
1602 // itself is not the program root (consider RLS).
1607 let matches = if let Some(matches) = handle_options(&args) {
1613 let mut result = Vec::new();
1614 let mut excluded_cargo_defaults = false;
1615 for flag in ICE_REPORT_COMPILER_FLAGS {
1616 let prefix = if flag.len() == 1 { "-" } else { "--" };
1618 for content in &matches.opt_strs(flag) {
1619 // Split always returns the first element
1620 let name = if let Some(first) = content.split('=').next() {
1626 let content = if ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE.contains(&name) {
1632 if !ICE_REPORT_COMPILER_FLAGS_EXCLUDE.contains(&name) {
1633 result.push(format!("{}{} {}", prefix, flag, content));
1635 excluded_cargo_defaults = true;
1640 if result.len() > 0 {
1641 Some((result, excluded_cargo_defaults))
1648 pub struct CompilationFailure;
1650 impl Error for CompilationFailure {}
1652 impl Display for CompilationFailure {
1653 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1654 write!(f, "compilation had errors")
1658 /// Run a procedure which will detect panics in the compiler and print nicer
1659 /// error messages rather than just failing the test.
1661 /// The diagnostic emitter yielded to the procedure should be used for reporting
1662 /// errors of the compiler.
1663 pub fn monitor<F: FnOnce() + Send + 'static>(f: F) -> Result<(), CompilationFailure> {
1664 in_rustc_thread(move || {
1666 }).map_err(|value| {
1667 if value.is::<errors::FatalErrorMarker>() {
1670 // Thread panicked without emitting a fatal diagnostic
1674 Box::new(errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
1678 let handler = errors::Handler::with_emitter(true, false, emitter);
1680 // a .span_bug or .bug call has already printed what
1681 // it wants to print.
1682 if !value.is::<errors::ExplicitBug>() {
1683 handler.emit(&MultiSpan::new(),
1685 errors::Level::Bug);
1689 "the compiler unexpectedly panicked. this is a bug.".to_string(),
1690 format!("we would appreciate a bug report: {}", BUG_REPORT_URL),
1691 format!("rustc {} running on {}",
1692 option_env!("CFG_VERSION").unwrap_or("unknown_version"),
1693 config::host_triple()),
1696 if let Some((flags, excluded_cargo_defaults)) = extra_compiler_flags() {
1697 xs.push(format!("compiler flags: {}", flags.join(" ")));
1699 if excluded_cargo_defaults {
1700 xs.push("some of the compiler flags provided by cargo are hidden".to_string());
1705 handler.emit(&MultiSpan::new(),
1707 errors::Level::Note);
1710 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
1715 pub fn diagnostics_registry() -> errors::registry::Registry {
1716 use errors::registry::Registry;
1718 let mut all_errors = Vec::new();
1719 all_errors.extend_from_slice(&rustc::DIAGNOSTICS);
1720 all_errors.extend_from_slice(&rustc_typeck::DIAGNOSTICS);
1721 all_errors.extend_from_slice(&rustc_resolve::DIAGNOSTICS);
1722 all_errors.extend_from_slice(&rustc_privacy::DIAGNOSTICS);
1723 // FIXME: need to figure out a way to get these back in here
1724 // all_errors.extend_from_slice(get_codegen_backend(sess).diagnostics());
1725 all_errors.extend_from_slice(&rustc_codegen_utils::DIAGNOSTICS);
1726 all_errors.extend_from_slice(&rustc_metadata::DIAGNOSTICS);
1727 all_errors.extend_from_slice(&rustc_passes::DIAGNOSTICS);
1728 all_errors.extend_from_slice(&rustc_plugin::DIAGNOSTICS);
1729 all_errors.extend_from_slice(&rustc_mir::DIAGNOSTICS);
1730 all_errors.extend_from_slice(&syntax::DIAGNOSTICS);
1732 Registry::new(&all_errors)
1735 /// This allows tools to enable rust logging without having to magically match rustc's
1736 /// log crate version
1737 pub fn init_rustc_env_logger() {
1742 init_rustc_env_logger();
1743 let result = run(|| {
1744 let args = env::args_os().enumerate()
1745 .map(|(i, arg)| arg.into_string().unwrap_or_else(|arg| {
1746 early_error(ErrorOutputType::default(),
1747 &format!("Argument {} is not valid Unicode: {:?}", i, arg))
1749 .collect::<Vec<_>>();
1751 Box::new(RustcDefaultCalls),
1755 process::exit(result as i32);