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 #![deny(bare_trait_objects)]
19 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
20 html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
21 html_root_url = "https://doc.rust-lang.org/nightly/")]
23 #![feature(box_syntax)]
24 #![cfg_attr(unix, feature(libc))]
26 #![feature(rustc_diagnostic_macros)]
27 #![feature(slice_sort_by_cached_key)]
28 #![feature(set_stdio)]
29 #![feature(rustc_stack_internals)]
32 #![recursion_limit="256"]
36 extern crate graphviz;
37 extern crate env_logger;
40 extern crate rustc_rayon as rayon;
42 extern crate rustc_allocator;
43 extern crate rustc_target;
44 extern crate rustc_borrowck;
45 extern crate rustc_data_structures;
46 extern crate rustc_errors as errors;
47 extern crate rustc_passes;
48 extern crate rustc_lint;
49 extern crate rustc_plugin;
50 extern crate rustc_privacy;
51 extern crate rustc_incremental;
52 extern crate rustc_metadata;
53 extern crate rustc_mir;
54 extern crate rustc_resolve;
55 extern crate rustc_save_analysis;
56 extern crate rustc_traits;
57 extern crate rustc_codegen_utils;
58 extern crate rustc_typeck;
59 extern crate scoped_tls;
60 extern crate serialize;
64 extern crate syntax_ext;
65 extern crate syntax_pos;
67 use driver::CompileController;
68 use pretty::{PpMode, UserIdentifiedItem};
70 use rustc_resolve as resolve;
71 use rustc_save_analysis as save;
72 use rustc_save_analysis::DumpHandler;
73 use rustc_data_structures::sync::{self, Lrc};
74 use rustc_data_structures::OnDrop;
75 use rustc::session::{self, config, Session, build_session, CompileResult};
76 use rustc::session::CompileIncomplete;
77 use rustc::session::config::{Input, PrintRequest, ErrorOutputType};
78 use rustc::session::config::nightly_options;
79 use rustc::session::filesearch;
80 use rustc::session::{early_error, early_warn};
81 use rustc::lint::Lint;
83 use rustc::middle::cstore::CrateStore;
84 use rustc_metadata::locator;
85 use rustc_metadata::cstore::CStore;
86 use rustc_metadata::dynamic_lib::DynamicLibrary;
87 use rustc::util::common::{time, ErrorReported};
88 use rustc_codegen_utils::codegen_backend::CodegenBackend;
90 use serialize::json::ToJson;
94 use std::default::Default;
95 use std::env::consts::{DLL_PREFIX, DLL_SUFFIX};
97 use std::error::Error;
98 use std::ffi::OsString;
99 use std::fmt::{self, Display};
100 use std::io::{self, Read, Write};
103 use std::path::{PathBuf, Path};
104 use std::process::{self, Command, Stdio};
106 use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
107 use std::sync::{Once, ONCE_INIT};
111 use syntax::codemap::{CodeMap, FileLoader, RealFileLoader};
112 use syntax::feature_gate::{GatedCfg, UnstableFeatures};
113 use syntax::parse::{self, PResult};
114 use syntax_pos::{hygiene, DUMMY_SP, MultiSpan, FileName};
122 mod derive_registrar;
124 pub mod target_features {
126 use syntax::symbol::Symbol;
127 use rustc::session::Session;
128 use rustc_codegen_utils::codegen_backend::CodegenBackend;
130 /// Add `target_feature = "..."` cfgs for a variety of platform
131 /// specific features (SSE, NEON etc.).
133 /// This is performed by checking whether a whitelisted set of
134 /// features is available on the target machine, by querying LLVM.
135 pub fn add_configuration(cfg: &mut ast::CrateConfig,
137 codegen_backend: &dyn CodegenBackend) {
138 let tf = Symbol::intern("target_feature");
140 for feat in codegen_backend.target_features(sess) {
141 cfg.insert((tf, Some(feat)));
144 if sess.crt_static_feature() {
145 cfg.insert((tf, Some(Symbol::intern("crt-static"))));
150 /// Exit status code used for successful compilation and help output.
151 pub const EXIT_SUCCESS: isize = 0;
153 /// Exit status code used for compilation failures and invalid flags.
154 pub const EXIT_FAILURE: isize = 1;
156 const BUG_REPORT_URL: &'static str = "https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.\
159 const ICE_REPORT_COMPILER_FLAGS: &'static [&'static str] = &[
164 const ICE_REPORT_COMPILER_FLAGS_EXCLUDE: &'static [&'static str] = &[
168 const ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE: &'static [&'static str] = &[
172 pub fn abort_on_err<T>(result: Result<T, CompileIncomplete>, sess: &Session) -> T {
174 Err(CompileIncomplete::Errored(ErrorReported)) => {
175 sess.abort_if_errors();
176 panic!("error reported but abort_if_errors didn't abort???");
178 Err(CompileIncomplete::Stopped) => {
179 sess.fatal("compilation terminated");
185 pub fn run<F>(run_compiler: F) -> isize
186 where F: FnOnce() -> (CompileResult, Option<Session>) + Send + 'static
188 let result = monitor(move || {
189 let (result, session) = run_compiler();
190 if let Err(CompileIncomplete::Errored(_)) = result {
193 sess.abort_if_errors();
194 panic!("error reported but abort_if_errors didn't abort???");
198 errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
202 let handler = errors::Handler::with_emitter(true, false, Box::new(emitter));
203 handler.emit(&MultiSpan::new(),
204 "aborting due to previous error(s)",
205 errors::Level::Fatal);
206 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
213 Ok(()) => EXIT_SUCCESS,
214 Err(_) => EXIT_FAILURE,
218 fn load_backend_from_dylib(path: &Path) -> fn() -> Box<dyn CodegenBackend> {
219 // Note that we're specifically using `open_global_now` here rather than
220 // `open`, namely we want the behavior on Unix of RTLD_GLOBAL and RTLD_NOW,
221 // where NOW means "bind everything right now" because we don't want
222 // surprises later on and RTLD_GLOBAL allows the symbols to be made
223 // available for future dynamic libraries opened. This is currently used by
224 // loading LLVM and then making its symbols available for other dynamic
226 let lib = match DynamicLibrary::open_global_now(path) {
229 let err = format!("couldn't load codegen backend {:?}: {:?}",
232 early_error(ErrorOutputType::default(), &err);
236 match lib.symbol("__rustc_codegen_backend") {
239 mem::transmute::<*mut u8, _>(f)
242 let err = format!("couldn't load codegen backend as it \
243 doesn't export the `__rustc_codegen_backend` \
245 early_error(ErrorOutputType::default(), &err);
251 pub fn get_codegen_backend(sess: &Session) -> Box<dyn CodegenBackend> {
252 static INIT: Once = ONCE_INIT;
256 static mut LOAD: fn() -> Box<dyn CodegenBackend> = || unreachable!();
259 let codegen_name = sess.opts.debugging_opts.codegen_backend.as_ref()
260 .unwrap_or(&sess.target.target.options.codegen_backend);
261 let backend = match &codegen_name[..] {
263 rustc_codegen_utils::codegen_backend::MetadataOnlyCodegenBackend::new
265 filename if filename.contains(".") => {
266 load_backend_from_dylib(filename.as_ref())
268 codegen_name => get_codegen_sysroot(codegen_name),
275 let backend = unsafe { LOAD() };
280 fn get_codegen_sysroot(backend_name: &str) -> fn() -> Box<dyn CodegenBackend> {
281 // For now we only allow this function to be called once as it'll dlopen a
282 // few things, which seems to work best if we only do that once. In
283 // general this assertion never trips due to the once guard in `get_codegen_backend`,
284 // but there's a few manual calls to this function in this file we protect
286 static LOADED: AtomicBool = ATOMIC_BOOL_INIT;
287 assert!(!LOADED.fetch_or(true, Ordering::SeqCst),
288 "cannot load the default codegen backend twice");
290 // When we're compiling this library with `--test` it'll run as a binary but
291 // not actually exercise much functionality. As a result most of the logic
292 // here is defunkt (it assumes we're a dynamic library in a sysroot) so
293 // let's just return a dummy creation function which won't be used in
296 return rustc_codegen_utils::codegen_backend::MetadataOnlyCodegenBackend::new
299 let target = session::config::host_triple();
300 let mut sysroot_candidates = vec![filesearch::get_or_default_sysroot()];
301 let path = current_dll_path()
302 .and_then(|s| s.canonicalize().ok());
303 if let Some(dll) = path {
304 // use `parent` twice to chop off the file name and then also the
305 // directory containing the dll which should be either `lib` or `bin`.
306 if let Some(path) = dll.parent().and_then(|p| p.parent()) {
307 // The original `path` pointed at the `rustc_driver` crate's dll.
308 // Now that dll should only be in one of two locations. The first is
309 // in the compiler's libdir, for example `$sysroot/lib/*.dll`. The
310 // other is the target's libdir, for example
311 // `$sysroot/lib/rustlib/$target/lib/*.dll`.
313 // We don't know which, so let's assume that if our `path` above
314 // ends in `$target` we *could* be in the target libdir, and always
315 // assume that we may be in the main libdir.
316 sysroot_candidates.push(path.to_owned());
318 if path.ends_with(target) {
319 sysroot_candidates.extend(path.parent() // chop off `$target`
320 .and_then(|p| p.parent()) // chop off `rustlib`
321 .and_then(|p| p.parent()) // chop off `lib`
322 .map(|s| s.to_owned()));
327 let sysroot = sysroot_candidates.iter()
329 let libdir = filesearch::relative_target_lib_path(&sysroot, &target);
331 .with_file_name(option_env!("CFG_CODEGEN_BACKENDS_DIR")
332 .unwrap_or("codegen-backends"))
335 info!("codegen backend candidate: {}", f.display());
339 let sysroot = match sysroot {
342 let candidates = sysroot_candidates.iter()
343 .map(|p| p.display().to_string())
346 let err = format!("failed to find a `codegen-backends` folder \
347 in the sysroot candidates:\n* {}", candidates);
348 early_error(ErrorOutputType::default(), &err);
351 info!("probing {} for a codegen backend", sysroot.display());
353 let d = match sysroot.read_dir() {
356 let err = format!("failed to load default codegen backend, couldn't \
357 read `{}`: {}", sysroot.display(), e);
358 early_error(ErrorOutputType::default(), &err);
362 let mut file: Option<PathBuf> = None;
364 let expected_name = format!("rustc_codegen_llvm-{}", backend_name);
365 for entry in d.filter_map(|e| e.ok()) {
366 let path = entry.path();
367 let filename = match path.file_name().and_then(|s| s.to_str()) {
371 if !(filename.starts_with(DLL_PREFIX) && filename.ends_with(DLL_SUFFIX)) {
374 let name = &filename[DLL_PREFIX.len() .. filename.len() - DLL_SUFFIX.len()];
375 if name != expected_name {
378 if let Some(ref prev) = file {
379 let err = format!("duplicate codegen backends found\n\
382 ", prev.display(), path.display());
383 early_error(ErrorOutputType::default(), &err);
385 file = Some(path.clone());
389 Some(ref s) => return load_backend_from_dylib(s),
391 let err = format!("failed to load default codegen backend for `{}`, \
392 no appropriate codegen dylib found in `{}`",
393 backend_name, sysroot.display());
394 early_error(ErrorOutputType::default(), &err);
399 fn current_dll_path() -> Option<PathBuf> {
400 use std::ffi::{OsStr, CStr};
401 use std::os::unix::prelude::*;
404 let addr = current_dll_path as usize as *mut _;
405 let mut info = mem::zeroed();
406 if libc::dladdr(addr, &mut info) == 0 {
407 info!("dladdr failed");
410 if info.dli_fname.is_null() {
411 info!("dladdr returned null pointer");
414 let bytes = CStr::from_ptr(info.dli_fname).to_bytes();
415 let os = OsStr::from_bytes(bytes);
416 Some(PathBuf::from(os))
421 fn current_dll_path() -> Option<PathBuf> {
422 use std::ffi::OsString;
423 use std::os::windows::prelude::*;
426 fn GetModuleHandleExW(dwFlags: u32,
428 phModule: *mut usize) -> i32;
429 fn GetModuleFileNameW(hModule: usize,
430 lpFilename: *mut u16,
434 const GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS: u32 = 0x00000004;
438 let r = GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
439 current_dll_path as usize,
442 info!("GetModuleHandleExW failed: {}", io::Error::last_os_error());
445 let mut space = Vec::with_capacity(1024);
446 let r = GetModuleFileNameW(module,
448 space.capacity() as u32);
450 info!("GetModuleFileNameW failed: {}", io::Error::last_os_error());
454 if r >= space.capacity() {
455 info!("our buffer was too small? {}",
456 io::Error::last_os_error());
460 let os = OsString::from_wide(&space);
461 Some(PathBuf::from(os))
466 // Parse args and run the compiler. This is the primary entry point for rustc.
467 // See comments on CompilerCalls below for details about the callbacks argument.
468 // The FileLoader provides a way to load files from sources other than the file system.
469 pub fn run_compiler<'a>(args: &[String],
470 callbacks: Box<dyn CompilerCalls<'a> + sync::Send + 'a>,
471 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
472 emitter_dest: Option<Box<dyn Write + Send>>)
473 -> (CompileResult, Option<Session>)
475 syntax::with_globals(|| {
476 let matches = match handle_options(args) {
477 Some(matches) => matches,
478 None => return (Ok(()), None),
481 let (sopts, cfg) = config::build_session_options_and_crate_config(&matches);
482 hygiene::set_default_edition(sopts.edition);
484 driver::spawn_thread_pool(sopts, |sopts| {
485 run_compiler_with_pool(matches, sopts, cfg, callbacks, file_loader, emitter_dest)
490 fn run_compiler_with_pool<'a>(
491 matches: getopts::Matches,
492 sopts: config::Options,
493 cfg: ast::CrateConfig,
494 mut callbacks: Box<dyn CompilerCalls<'a> + sync::Send + 'a>,
495 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
496 emitter_dest: Option<Box<dyn Write + Send>>
497 ) -> (CompileResult, Option<Session>) {
498 macro_rules! do_or_return {($expr: expr, $sess: expr) => {
500 Compilation::Stop => return (Ok(()), $sess),
501 Compilation::Continue => {}
505 let descriptions = diagnostics_registry();
507 do_or_return!(callbacks.early_callback(&matches,
514 let (odir, ofile) = make_output(&matches);
515 let (input, input_file_path, input_err) = match make_input(&matches.free) {
516 Some((input, input_file_path, input_err)) => {
517 let (input, input_file_path) = callbacks.some_input(input, input_file_path);
518 (input, input_file_path, input_err)
520 None => match callbacks.no_input(&matches, &sopts, &cfg, &odir, &ofile, &descriptions) {
521 Some((input, input_file_path)) => (input, input_file_path, None),
522 None => return (Ok(()), None),
526 let loader = file_loader.unwrap_or(box RealFileLoader);
527 let codemap = Lrc::new(CodeMap::with_file_loader(loader, sopts.file_path_mapping()));
528 let mut sess = session::build_session_with_codemap(
529 sopts, input_file_path.clone(), descriptions, codemap, emitter_dest,
532 if let Some(err) = input_err {
533 // Immediately stop compilation if there was an issue reading
534 // the input (for example if the input stream is not UTF-8).
535 sess.err(&format!("{}", err));
536 return (Err(CompileIncomplete::Stopped), Some(sess));
539 let codegen_backend = get_codegen_backend(&sess);
541 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
543 let mut cfg = config::build_configuration(&sess, cfg);
544 target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
545 sess.parse_sess.config = cfg;
548 let plugins = sess.opts.debugging_opts.extra_plugins.clone();
550 let cstore = CStore::new(codegen_backend.metadata_loader());
552 do_or_return!(callbacks.late_callback(&*codegen_backend,
558 &ofile), Some(sess));
560 let _sess_abort_error = OnDrop(|| sess.diagnostic().print_error_count());
562 let control = callbacks.build_controller(&sess, &matches);
564 driver::compile_input(codegen_backend,
579 pub fn set_sigpipe_handler() {
581 // Set the SIGPIPE signal handler, so that an EPIPE
582 // will cause rustc to terminate, as expected.
583 assert!(libc::signal(libc::SIGPIPE, libc::SIG_DFL) != libc::SIG_ERR);
588 pub fn set_sigpipe_handler() {}
590 // Extract output directory and file from matches.
591 fn make_output(matches: &getopts::Matches) -> (Option<PathBuf>, Option<PathBuf>) {
592 let odir = matches.opt_str("out-dir").map(|o| PathBuf::from(&o));
593 let ofile = matches.opt_str("o").map(|o| PathBuf::from(&o));
597 // Extract input (string or file and optional path) from matches.
598 fn make_input(free_matches: &[String]) -> Option<(Input, Option<PathBuf>, Option<io::Error>)> {
599 if free_matches.len() == 1 {
600 let ifile = &free_matches[0];
602 let mut src = String::new();
603 let err = if io::stdin().read_to_string(&mut src).is_err() {
604 Some(io::Error::new(io::ErrorKind::InvalidData,
605 "couldn't read from stdin, as it did not contain valid UTF-8"))
609 Some((Input::Str { name: FileName::Anon, input: src },
612 Some((Input::File(PathBuf::from(ifile)),
613 Some(PathBuf::from(ifile)), None))
620 fn parse_pretty(sess: &Session,
621 matches: &getopts::Matches)
622 -> Option<(PpMode, Option<UserIdentifiedItem>)> {
623 let pretty = if sess.opts.debugging_opts.unstable_options {
624 matches.opt_default("pretty", "normal").map(|a| {
625 // stable pretty-print variants only
626 pretty::parse_pretty(sess, &a, false)
632 if pretty.is_none() {
633 sess.opts.debugging_opts.unpretty.as_ref().map(|a| {
634 // extended with unstable pretty-print variants
635 pretty::parse_pretty(sess, &a, true)
642 // Whether to stop or continue compilation.
643 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
644 pub enum Compilation {
650 pub fn and_then<F: FnOnce() -> Compilation>(self, next: F) -> Compilation {
652 Compilation::Stop => Compilation::Stop,
653 Compilation::Continue => next(),
658 /// A trait for customising the compilation process. Offers a number of hooks for
659 /// executing custom code or customising input.
660 pub trait CompilerCalls<'a> {
661 /// Hook for a callback early in the process of handling arguments. This will
662 /// be called straight after options have been parsed but before anything
663 /// else (e.g., selecting input and output).
664 fn early_callback(&mut self,
665 _: &getopts::Matches,
667 _: &ast::CrateConfig,
668 _: &errors::registry::Registry,
671 Compilation::Continue
674 /// Hook for a callback late in the process of handling arguments. This will
675 /// be called just before actual compilation starts (and before build_controller
676 /// is called), after all arguments etc. have been completely handled.
677 fn late_callback(&mut self,
678 _: &dyn CodegenBackend,
679 _: &getopts::Matches,
686 Compilation::Continue
689 /// Called after we extract the input from the arguments. Gives the implementer
690 /// an opportunity to change the inputs or to add some custom input handling.
691 /// The default behaviour is to simply pass through the inputs.
692 fn some_input(&mut self,
694 input_path: Option<PathBuf>)
695 -> (Input, Option<PathBuf>) {
699 /// Called after we extract the input from the arguments if there is no valid
700 /// input. Gives the implementer an opportunity to supply alternate input (by
701 /// returning a Some value) or to add custom behaviour for this error such as
702 /// emitting error messages. Returning None will cause compilation to stop
704 fn no_input(&mut self,
705 _: &getopts::Matches,
707 _: &ast::CrateConfig,
710 _: &errors::registry::Registry)
711 -> Option<(Input, Option<PathBuf>)> {
715 // Create a CompilController struct for controlling the behaviour of
721 ) -> CompileController<'a>;
724 /// CompilerCalls instance for a regular rustc build.
725 #[derive(Copy, Clone)]
726 pub struct RustcDefaultCalls;
728 // FIXME remove these and use winapi 0.3 instead
729 // Duplicates: bootstrap/compile.rs, librustc_errors/emitter.rs
731 fn stdout_isatty() -> bool {
732 unsafe { libc::isatty(libc::STDOUT_FILENO) != 0 }
736 fn stdout_isatty() -> bool {
739 type HANDLE = *mut u8;
740 type LPDWORD = *mut u32;
741 const STD_OUTPUT_HANDLE: DWORD = -11i32 as DWORD;
743 fn GetStdHandle(which: DWORD) -> HANDLE;
744 fn GetConsoleMode(hConsoleHandle: HANDLE, lpMode: LPDWORD) -> BOOL;
747 let handle = GetStdHandle(STD_OUTPUT_HANDLE);
749 GetConsoleMode(handle, &mut out) != 0
753 fn handle_explain(code: &str,
754 descriptions: &errors::registry::Registry,
755 output: ErrorOutputType) {
756 let normalised = if code.starts_with("E") {
759 format!("E{0:0>4}", code)
761 match descriptions.find_description(&normalised) {
762 Some(ref description) => {
763 let mut is_in_code_block = false;
764 let mut text = String::new();
766 // Slice off the leading newline and print.
767 for line in description[1..].lines() {
768 let indent_level = line.find(|c: char| !c.is_whitespace())
769 .unwrap_or_else(|| line.len());
770 let dedented_line = &line[indent_level..];
771 if dedented_line.starts_with("```") {
772 is_in_code_block = !is_in_code_block;
773 text.push_str(&line[..(indent_level+3)]);
774 } else if is_in_code_block && dedented_line.starts_with("# ") {
783 show_content_with_pager(&text);
789 early_error(output, &format!("no extended information for {}", code));
794 fn show_content_with_pager(content: &String) {
795 let pager_name = env::var_os("PAGER").unwrap_or_else(|| if cfg!(windows) {
796 OsString::from("more.com")
798 OsString::from("less")
801 let mut fallback_to_println = false;
803 match Command::new(pager_name).stdin(Stdio::piped()).spawn() {
805 if let Some(pipe) = pager.stdin.as_mut() {
806 if pipe.write_all(content.as_bytes()).is_err() {
807 fallback_to_println = true;
811 if pager.wait().is_err() {
812 fallback_to_println = true;
816 fallback_to_println = true;
820 // If pager fails for whatever reason, we should still print the content
821 // to standard output
822 if fallback_to_println {
823 print!("{}", content);
827 impl<'a> CompilerCalls<'a> for RustcDefaultCalls {
828 fn early_callback(&mut self,
829 matches: &getopts::Matches,
831 _: &ast::CrateConfig,
832 descriptions: &errors::registry::Registry,
833 output: ErrorOutputType)
835 if let Some(ref code) = matches.opt_str("explain") {
836 handle_explain(code, descriptions, output);
837 return Compilation::Stop;
840 Compilation::Continue
843 fn no_input(&mut self,
844 matches: &getopts::Matches,
845 sopts: &config::Options,
846 cfg: &ast::CrateConfig,
847 odir: &Option<PathBuf>,
848 ofile: &Option<PathBuf>,
849 descriptions: &errors::registry::Registry)
850 -> Option<(Input, Option<PathBuf>)> {
851 match matches.free.len() {
853 let mut sess = build_session(sopts.clone(),
855 descriptions.clone());
856 if sopts.describe_lints {
857 let mut ls = lint::LintStore::new();
858 rustc_lint::register_builtins(&mut ls, Some(&sess));
859 describe_lints(&sess, &ls, false);
862 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
863 let mut cfg = config::build_configuration(&sess, cfg.clone());
864 let codegen_backend = get_codegen_backend(&sess);
865 target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
866 sess.parse_sess.config = cfg;
867 let should_stop = RustcDefaultCalls::print_crate_info(
875 if should_stop == Compilation::Stop {
878 early_error(sopts.error_format, "no input filename given");
880 1 => panic!("make_input should have provided valid inputs"),
881 _ => early_error(sopts.error_format, "multiple input filenames provided"),
885 fn late_callback(&mut self,
886 codegen_backend: &dyn CodegenBackend,
887 matches: &getopts::Matches,
889 cstore: &dyn CrateStore,
891 odir: &Option<PathBuf>,
892 ofile: &Option<PathBuf>)
894 RustcDefaultCalls::print_crate_info(codegen_backend, sess, Some(input), odir, ofile)
895 .and_then(|| RustcDefaultCalls::list_metadata(sess, cstore, matches, input))
898 fn build_controller(self: Box<Self>,
900 matches: &getopts::Matches)
901 -> CompileController<'a> {
902 let mut control = CompileController::basic();
904 control.keep_ast = sess.opts.debugging_opts.keep_ast;
905 control.continue_parse_after_error = sess.opts.debugging_opts.continue_parse_after_error;
907 if let Some((ppm, opt_uii)) = parse_pretty(sess, matches) {
908 if ppm.needs_ast_map(&opt_uii) {
909 control.after_hir_lowering.stop = Compilation::Stop;
911 control.after_parse.callback = box move |state| {
912 state.krate = Some(pretty::fold_crate(state.session,
913 state.krate.take().unwrap(),
916 control.after_hir_lowering.callback = box move |state| {
917 pretty::print_after_hir_lowering(state.session,
918 state.cstore.unwrap(),
919 state.hir_map.unwrap(),
920 state.analysis.unwrap(),
921 state.resolutions.unwrap(),
923 &state.expanded_crate.take().unwrap(),
924 state.crate_name.unwrap(),
926 state.arenas.unwrap(),
927 state.output_filenames.unwrap(),
932 control.after_parse.stop = Compilation::Stop;
934 control.after_parse.callback = box move |state| {
935 let krate = pretty::fold_crate(state.session, state.krate.take().unwrap(), ppm);
936 pretty::print_after_parsing(state.session,
947 if sess.opts.debugging_opts.parse_only ||
948 sess.opts.debugging_opts.show_span.is_some() ||
949 sess.opts.debugging_opts.ast_json_noexpand {
950 control.after_parse.stop = Compilation::Stop;
953 if sess.opts.debugging_opts.no_analysis ||
954 sess.opts.debugging_opts.ast_json {
955 control.after_hir_lowering.stop = Compilation::Stop;
958 if sess.opts.debugging_opts.save_analysis {
959 enable_save_analysis(&mut control);
962 if sess.print_fuel_crate.is_some() {
963 let old_callback = control.compilation_done.callback;
964 control.compilation_done.callback = box move |state| {
966 let sess = state.session;
967 println!("Fuel used by {}: {}",
968 sess.print_fuel_crate.as_ref().unwrap(),
969 sess.print_fuel.get());
976 pub fn enable_save_analysis(control: &mut CompileController) {
977 control.keep_ast = true;
978 control.after_analysis.callback = box |state| {
979 time(state.session, "save analysis", || {
980 save::process_crate(state.tcx.unwrap(),
981 state.expanded_crate.unwrap(),
982 state.analysis.unwrap(),
983 state.crate_name.unwrap(),
985 DumpHandler::new(state.out_dir,
986 state.crate_name.unwrap()))
989 control.after_analysis.run_callback_on_error = true;
990 control.make_glob_map = resolve::MakeGlobMap::Yes;
993 impl RustcDefaultCalls {
994 pub fn list_metadata(sess: &Session,
995 cstore: &dyn CrateStore,
996 matches: &getopts::Matches,
999 let r = matches.opt_strs("Z");
1000 if r.contains(&("ls".to_string())) {
1002 &Input::File(ref ifile) => {
1003 let path = &(*ifile);
1004 let mut v = Vec::new();
1005 locator::list_file_metadata(&sess.target.target,
1007 cstore.metadata_loader(),
1010 println!("{}", String::from_utf8(v).unwrap());
1012 &Input::Str { .. } => {
1013 early_error(ErrorOutputType::default(), "cannot list metadata for stdin");
1016 return Compilation::Stop;
1019 return Compilation::Continue;
1023 fn print_crate_info(codegen_backend: &dyn CodegenBackend,
1025 input: Option<&Input>,
1026 odir: &Option<PathBuf>,
1027 ofile: &Option<PathBuf>)
1029 use rustc::session::config::PrintRequest::*;
1030 // PrintRequest::NativeStaticLibs is special - printed during linking
1031 // (empty iterator returns true)
1032 if sess.opts.prints.iter().all(|&p| p==PrintRequest::NativeStaticLibs) {
1033 return Compilation::Continue;
1036 let attrs = match input {
1039 let result = parse_crate_attrs(sess, input);
1041 Ok(attrs) => Some(attrs),
1042 Err(mut parse_error) => {
1044 return Compilation::Stop;
1049 for req in &sess.opts.prints {
1052 let mut targets = rustc_target::spec::get_targets().collect::<Vec<String>>();
1054 println!("{}", targets.join("\n"));
1056 Sysroot => println!("{}", sess.sysroot().display()),
1057 TargetSpec => println!("{}", sess.target.target.to_json().pretty()),
1058 FileNames | CrateName => {
1059 let input = match input {
1060 Some(input) => input,
1061 None => early_error(ErrorOutputType::default(), "no input file provided"),
1063 let attrs = attrs.as_ref().unwrap();
1064 let t_outputs = driver::build_output_filenames(input, odir, ofile, attrs, sess);
1065 let id = rustc_codegen_utils::link::find_crate_name(Some(sess), attrs, input);
1066 if *req == PrintRequest::CrateName {
1070 let crate_types = driver::collect_crate_types(sess, attrs);
1071 for &style in &crate_types {
1072 let fname = rustc_codegen_utils::link::filename_for_input(
1081 .to_string_lossy());
1085 let allow_unstable_cfg = UnstableFeatures::from_environment()
1086 .is_nightly_build();
1088 let mut cfgs = Vec::new();
1089 for &(name, ref value) in sess.parse_sess.config.iter() {
1090 let gated_cfg = GatedCfg::gate(&ast::MetaItem {
1091 ident: ast::Path::from_ident(ast::Ident::with_empty_ctxt(name)),
1092 node: ast::MetaItemKind::Word,
1096 // Note that crt-static is a specially recognized cfg
1097 // directive that's printed out here as part of
1098 // rust-lang/rust#37406, but in general the
1099 // `target_feature` cfg is gated under
1100 // rust-lang/rust#29717. For now this is just
1101 // specifically allowing the crt-static cfg and that's
1102 // it, this is intended to get into Cargo and then go
1103 // through to build scripts.
1104 let value = value.as_ref().map(|s| s.as_str());
1105 let value = value.as_ref().map(|s| s.as_ref());
1106 if name != "target_feature" || value != Some("crt-static") {
1107 if !allow_unstable_cfg && gated_cfg.is_some() {
1112 cfgs.push(if let Some(value) = value {
1113 format!("{}=\"{}\"", name, value)
1121 println!("{}", cfg);
1124 RelocationModels | CodeModels | TlsModels | TargetCPUs | TargetFeatures => {
1125 codegen_backend.print(*req, sess);
1127 // Any output here interferes with Cargo's parsing of other printed output
1128 PrintRequest::NativeStaticLibs => {}
1131 return Compilation::Stop;
1135 /// Returns a version string such as "0.12.0-dev".
1136 fn release_str() -> Option<&'static str> {
1137 option_env!("CFG_RELEASE")
1140 /// Returns the full SHA1 hash of HEAD of the Git repo from which rustc was built.
1141 fn commit_hash_str() -> Option<&'static str> {
1142 option_env!("CFG_VER_HASH")
1145 /// Returns the "commit date" of HEAD of the Git repo from which rustc was built as a static string.
1146 fn commit_date_str() -> Option<&'static str> {
1147 option_env!("CFG_VER_DATE")
1150 /// Prints version information
1151 pub fn version(binary: &str, matches: &getopts::Matches) {
1152 let verbose = matches.opt_present("verbose");
1156 option_env!("CFG_VERSION").unwrap_or("unknown version"));
1158 fn unw(x: Option<&str>) -> &str {
1159 x.unwrap_or("unknown")
1161 println!("binary: {}", binary);
1162 println!("commit-hash: {}", unw(commit_hash_str()));
1163 println!("commit-date: {}", unw(commit_date_str()));
1164 println!("host: {}", config::host_triple());
1165 println!("release: {}", unw(release_str()));
1166 get_codegen_sysroot("llvm")().print_version();
1170 fn usage(verbose: bool, include_unstable_options: bool) {
1171 let groups = if verbose {
1172 config::rustc_optgroups()
1174 config::rustc_short_optgroups()
1176 let mut options = getopts::Options::new();
1177 for option in groups.iter().filter(|x| include_unstable_options || x.is_stable()) {
1178 (option.apply)(&mut options);
1180 let message = format!("Usage: rustc [OPTIONS] INPUT");
1181 let nightly_help = if nightly_options::is_nightly_build() {
1182 "\n -Z help Print internal options for debugging rustc"
1186 let verbose_help = if verbose {
1189 "\n --help -v Print the full set of options rustc accepts"
1191 println!("{}\nAdditional help:
1192 -C help Print codegen options
1194 Print 'lint' options and default settings{}{}\n",
1195 options.usage(&message),
1200 fn print_wall_help() {
1202 The flag `-Wall` does not exist in `rustc`. Most useful lints are enabled by
1203 default. Use `rustc -W help` to see all available lints. It's more common to put
1204 warning settings in the crate root using `#![warn(LINT_NAME)]` instead of using
1205 the command line flag directly.
1209 fn describe_lints(sess: &Session, lint_store: &lint::LintStore, loaded_plugins: bool) {
1211 Available lint options:
1212 -W <foo> Warn about <foo>
1216 -F <foo> Forbid <foo> \
1217 (deny <foo> and all attempts to override)
1221 fn sort_lints(sess: &Session, lints: Vec<(&'static Lint, bool)>) -> Vec<&'static Lint> {
1222 let mut lints: Vec<_> = lints.into_iter().map(|(x, _)| x).collect();
1223 // The sort doesn't case-fold but it's doubtful we care.
1224 lints.sort_by_cached_key(|x: &&Lint| (x.default_level(sess), x.name));
1228 fn sort_lint_groups(lints: Vec<(&'static str, Vec<lint::LintId>, bool)>)
1229 -> Vec<(&'static str, Vec<lint::LintId>)> {
1230 let mut lints: Vec<_> = lints.into_iter().map(|(x, y, _)| (x, y)).collect();
1231 lints.sort_by_key(|l| l.0);
1235 let (plugin, builtin): (Vec<_>, _) = lint_store.get_lints()
1238 .partition(|&(_, p)| p);
1239 let plugin = sort_lints(sess, plugin);
1240 let builtin = sort_lints(sess, builtin);
1242 let (plugin_groups, builtin_groups): (Vec<_>, _) = lint_store.get_lint_groups()
1245 .partition(|&(.., p)| p);
1246 let plugin_groups = sort_lint_groups(plugin_groups);
1247 let builtin_groups = sort_lint_groups(builtin_groups);
1249 let max_name_len = plugin.iter()
1251 .map(|&s| s.name.chars().count())
1254 let padded = |x: &str| {
1255 let mut s = " ".repeat(max_name_len - x.chars().count());
1260 println!("Lint checks provided by rustc:\n");
1261 println!(" {} {:7.7} {}", padded("name"), "default", "meaning");
1262 println!(" {} {:7.7} {}", padded("----"), "-------", "-------");
1264 let print_lints = |lints: Vec<&Lint>| {
1266 let name = lint.name_lower().replace("_", "-");
1267 println!(" {} {:7.7} {}",
1269 lint.default_level.as_str(),
1275 print_lints(builtin);
1279 let max_name_len = max("warnings".len(),
1280 plugin_groups.iter()
1281 .chain(&builtin_groups)
1282 .map(|&(s, _)| s.chars().count())
1286 let padded = |x: &str| {
1287 let mut s = " ".repeat(max_name_len - x.chars().count());
1292 println!("Lint groups provided by rustc:\n");
1293 println!(" {} {}", padded("name"), "sub-lints");
1294 println!(" {} {}", padded("----"), "---------");
1295 println!(" {} {}", padded("warnings"), "all lints that are set to issue warnings");
1297 let print_lint_groups = |lints: Vec<(&'static str, Vec<lint::LintId>)>| {
1298 for (name, to) in lints {
1299 let name = name.to_lowercase().replace("_", "-");
1300 let desc = to.into_iter()
1301 .map(|x| x.to_string().replace("_", "-"))
1302 .collect::<Vec<String>>()
1304 println!(" {} {}", padded(&name), desc);
1309 print_lint_groups(builtin_groups);
1311 match (loaded_plugins, plugin.len(), plugin_groups.len()) {
1312 (false, 0, _) | (false, _, 0) => {
1313 println!("Compiler plugins can provide additional lints and lint groups. To see a \
1314 listing of these, re-run `rustc -W help` with a crate filename.");
1316 (false, ..) => panic!("didn't load lint plugins but got them anyway!"),
1317 (true, 0, 0) => println!("This crate does not load any lint plugins or lint groups."),
1320 println!("Lint checks provided by plugins loaded by this crate:\n");
1321 print_lints(plugin);
1324 println!("Lint groups provided by plugins loaded by this crate:\n");
1325 print_lint_groups(plugin_groups);
1331 fn describe_debug_flags() {
1332 println!("\nAvailable debug options:\n");
1333 print_flag_list("-Z", config::DB_OPTIONS);
1336 fn describe_codegen_flags() {
1337 println!("\nAvailable codegen options:\n");
1338 print_flag_list("-C", config::CG_OPTIONS);
1341 fn print_flag_list<T>(cmdline_opt: &str,
1342 flag_list: &[(&'static str, T, Option<&'static str>, &'static str)]) {
1343 let max_len = flag_list.iter()
1344 .map(|&(name, _, opt_type_desc, _)| {
1345 let extra_len = match opt_type_desc {
1349 name.chars().count() + extra_len
1354 for &(name, _, opt_type_desc, desc) in flag_list {
1355 let (width, extra) = match opt_type_desc {
1356 Some(..) => (max_len - 4, "=val"),
1357 None => (max_len, ""),
1359 println!(" {} {:>width$}{} -- {}",
1361 name.replace("_", "-"),
1368 /// Process command line options. Emits messages as appropriate. If compilation
1369 /// should continue, returns a getopts::Matches object parsed from args,
1370 /// otherwise returns None.
1372 /// The compiler's handling of options is a little complicated as it ties into
1373 /// our stability story, and it's even *more* complicated by historical
1374 /// accidents. The current intention of each compiler option is to have one of
1377 /// 1. An option is stable and can be used everywhere.
1378 /// 2. An option is unstable, but was historically allowed on the stable
1380 /// 3. An option is unstable, and can only be used on nightly.
1382 /// Like unstable library and language features, however, unstable options have
1383 /// always required a form of "opt in" to indicate that you're using them. This
1384 /// provides the easy ability to scan a code base to check to see if anything
1385 /// unstable is being used. Currently, this "opt in" is the `-Z` "zed" flag.
1387 /// All options behind `-Z` are considered unstable by default. Other top-level
1388 /// options can also be considered unstable, and they were unlocked through the
1389 /// `-Z unstable-options` flag. Note that `-Z` remains to be the root of
1390 /// instability in both cases, though.
1392 /// So with all that in mind, the comments below have some more detail about the
1393 /// contortions done here to get things to work out correctly.
1394 pub fn handle_options(args: &[String]) -> Option<getopts::Matches> {
1395 // Throw away the first argument, the name of the binary
1396 let args = &args[1..];
1398 if args.is_empty() {
1399 // user did not write `-v` nor `-Z unstable-options`, so do not
1400 // include that extra information.
1401 usage(false, false);
1405 // Parse with *all* options defined in the compiler, we don't worry about
1406 // option stability here we just want to parse as much as possible.
1407 let mut options = getopts::Options::new();
1408 for option in config::rustc_optgroups() {
1409 (option.apply)(&mut options);
1411 let matches = match options.parse(args) {
1413 Err(f) => early_error(ErrorOutputType::default(), &f.to_string()),
1416 // For all options we just parsed, we check a few aspects:
1418 // * If the option is stable, we're all good
1419 // * If the option wasn't passed, we're all good
1420 // * If `-Z unstable-options` wasn't passed (and we're not a -Z option
1421 // ourselves), then we require the `-Z unstable-options` flag to unlock
1422 // this option that was passed.
1423 // * If we're a nightly compiler, then unstable options are now unlocked, so
1424 // we're good to go.
1425 // * Otherwise, if we're a truly unstable option then we generate an error
1426 // (unstable option being used on stable)
1427 // * If we're a historically stable-but-should-be-unstable option then we
1428 // emit a warning that we're going to turn this into an error soon.
1429 nightly_options::check_nightly_options(&matches, &config::rustc_optgroups());
1431 if matches.opt_present("h") || matches.opt_present("help") {
1432 // Only show unstable options in --help if we *really* accept unstable
1433 // options, which catches the case where we got `-Z unstable-options` on
1434 // the stable channel of Rust which was accidentally allowed
1436 usage(matches.opt_present("verbose"),
1437 nightly_options::is_unstable_enabled(&matches));
1441 // Handle the special case of -Wall.
1442 let wall = matches.opt_strs("W");
1443 if wall.iter().any(|x| *x == "all") {
1448 // Don't handle -W help here, because we might first load plugins.
1449 let r = matches.opt_strs("Z");
1450 if r.iter().any(|x| *x == "help") {
1451 describe_debug_flags();
1455 let cg_flags = matches.opt_strs("C");
1456 if cg_flags.iter().any(|x| *x == "help") {
1457 describe_codegen_flags();
1461 if cg_flags.iter().any(|x| *x == "no-stack-check") {
1462 early_warn(ErrorOutputType::default(),
1463 "the --no-stack-check flag is deprecated and does nothing");
1466 if cg_flags.contains(&"passes=list".to_string()) {
1467 get_codegen_sysroot("llvm")().print_passes();
1471 if matches.opt_present("version") {
1472 version("rustc", &matches);
1479 fn parse_crate_attrs<'a>(sess: &'a Session, input: &Input) -> PResult<'a, Vec<ast::Attribute>> {
1481 Input::File(ref ifile) => {
1482 parse::parse_crate_attrs_from_file(ifile, &sess.parse_sess)
1484 Input::Str { ref name, ref input } => {
1485 parse::parse_crate_attrs_from_source_str(name.clone(),
1492 /// Runs `f` in a suitable thread for running `rustc`; returns a `Result` with either the return
1493 /// value of `f` or -- if a panic occurs -- the panic value.
1495 /// This version applies the given name to the thread. This is used by rustdoc to ensure consistent
1496 /// doctest output across platforms and executions.
1497 pub fn in_named_rustc_thread<F, R>(name: String, f: F) -> Result<R, Box<dyn Any + Send>>
1498 where F: FnOnce() -> R + Send + 'static,
1501 // Temporarily have stack size set to 16MB to deal with nom-using crates failing
1502 const STACK_SIZE: usize = 16 * 1024 * 1024; // 16MB
1504 #[cfg(all(unix,not(target_os = "haiku")))]
1505 let spawn_thread = unsafe {
1506 // Fetch the current resource limits
1507 let mut rlim = libc::rlimit {
1511 if libc::getrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1512 let err = io::Error::last_os_error();
1513 error!("in_rustc_thread: error calling getrlimit: {}", err);
1515 } else if rlim.rlim_max < STACK_SIZE as libc::rlim_t {
1518 std::rt::deinit_stack_guard();
1519 rlim.rlim_cur = STACK_SIZE as libc::rlim_t;
1520 if libc::setrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1521 let err = io::Error::last_os_error();
1522 error!("in_rustc_thread: error calling setrlimit: {}", err);
1523 std::rt::update_stack_guard();
1526 std::rt::update_stack_guard();
1532 // We set the stack size at link time. See src/rustc/rustc.rs.
1534 let spawn_thread = false;
1536 #[cfg(target_os = "haiku")]
1537 let spawn_thread = unsafe {
1538 // Haiku does not have setrlimit implemented for the stack size.
1539 // By default it does have the 16 MB stack limit, but we check this in
1540 // case the minimum STACK_SIZE changes or Haiku's defaults change.
1541 let mut rlim = libc::rlimit {
1545 if libc::getrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1546 let err = io::Error::last_os_error();
1547 error!("in_rustc_thread: error calling getrlimit: {}", err);
1549 } else if rlim.rlim_cur >= STACK_SIZE {
1556 #[cfg(not(any(windows,unix)))]
1557 let spawn_thread = true;
1559 // The or condition is added from backward compatibility.
1560 if spawn_thread || env::var_os("RUST_MIN_STACK").is_some() {
1561 let mut cfg = thread::Builder::new().name(name);
1563 // FIXME: Hacks on hacks. If the env is trying to override the stack size
1564 // then *don't* set it explicitly.
1565 if env::var_os("RUST_MIN_STACK").is_none() {
1566 cfg = cfg.stack_size(STACK_SIZE);
1569 let thread = cfg.spawn(f);
1570 thread.unwrap().join()
1572 let f = panic::AssertUnwindSafe(f);
1573 panic::catch_unwind(f)
1577 /// Runs `f` in a suitable thread for running `rustc`; returns a
1578 /// `Result` with either the return value of `f` or -- if a panic
1579 /// occurs -- the panic value.
1580 pub fn in_rustc_thread<F, R>(f: F) -> Result<R, Box<dyn Any + Send>>
1581 where F: FnOnce() -> R + Send + 'static,
1584 in_named_rustc_thread("rustc".to_string(), f)
1587 /// Get a list of extra command-line flags provided by the user, as strings.
1589 /// This function is used during ICEs to show more information useful for
1590 /// debugging, since some ICEs only happens with non-default compiler flags
1591 /// (and the users don't always report them).
1592 fn extra_compiler_flags() -> Option<(Vec<String>, bool)> {
1593 let mut args = Vec::new();
1594 for arg in env::args_os() {
1595 args.push(arg.to_string_lossy().to_string());
1598 // Avoid printing help because of empty args. This can suggest the compiler
1599 // itself is not the program root (consider RLS).
1604 let matches = if let Some(matches) = handle_options(&args) {
1610 let mut result = Vec::new();
1611 let mut excluded_cargo_defaults = false;
1612 for flag in ICE_REPORT_COMPILER_FLAGS {
1613 let prefix = if flag.len() == 1 { "-" } else { "--" };
1615 for content in &matches.opt_strs(flag) {
1616 // Split always returns the first element
1617 let name = if let Some(first) = content.split('=').next() {
1623 let content = if ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE.contains(&name) {
1629 if !ICE_REPORT_COMPILER_FLAGS_EXCLUDE.contains(&name) {
1630 result.push(format!("{}{} {}", prefix, flag, content));
1632 excluded_cargo_defaults = true;
1637 if result.len() > 0 {
1638 Some((result, excluded_cargo_defaults))
1645 pub struct CompilationFailure;
1647 impl Error for CompilationFailure {}
1649 impl Display for CompilationFailure {
1650 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1651 write!(f, "compilation had errors")
1655 /// Run a procedure which will detect panics in the compiler and print nicer
1656 /// error messages rather than just failing the test.
1658 /// The diagnostic emitter yielded to the procedure should be used for reporting
1659 /// errors of the compiler.
1660 pub fn monitor<F: FnOnce() + Send + 'static>(f: F) -> Result<(), CompilationFailure> {
1661 in_rustc_thread(move || {
1663 }).map_err(|value| {
1664 if value.is::<errors::FatalErrorMarker>() {
1667 // Thread panicked without emitting a fatal diagnostic
1671 Box::new(errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
1675 let handler = errors::Handler::with_emitter(true, false, emitter);
1677 // a .span_bug or .bug call has already printed what
1678 // it wants to print.
1679 if !value.is::<errors::ExplicitBug>() {
1680 handler.emit(&MultiSpan::new(),
1682 errors::Level::Bug);
1686 "the compiler unexpectedly panicked. this is a bug.".to_string(),
1687 format!("we would appreciate a bug report: {}", BUG_REPORT_URL),
1688 format!("rustc {} running on {}",
1689 option_env!("CFG_VERSION").unwrap_or("unknown_version"),
1690 config::host_triple()),
1693 if let Some((flags, excluded_cargo_defaults)) = extra_compiler_flags() {
1694 xs.push(format!("compiler flags: {}", flags.join(" ")));
1696 if excluded_cargo_defaults {
1697 xs.push("some of the compiler flags provided by cargo are hidden".to_string());
1702 handler.emit(&MultiSpan::new(),
1704 errors::Level::Note);
1707 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
1712 pub fn diagnostics_registry() -> errors::registry::Registry {
1713 use errors::registry::Registry;
1715 let mut all_errors = Vec::new();
1716 all_errors.extend_from_slice(&rustc::DIAGNOSTICS);
1717 all_errors.extend_from_slice(&rustc_typeck::DIAGNOSTICS);
1718 all_errors.extend_from_slice(&rustc_resolve::DIAGNOSTICS);
1719 all_errors.extend_from_slice(&rustc_privacy::DIAGNOSTICS);
1720 // FIXME: need to figure out a way to get these back in here
1721 // all_errors.extend_from_slice(get_codegen_backend(sess).diagnostics());
1722 all_errors.extend_from_slice(&rustc_codegen_utils::DIAGNOSTICS);
1723 all_errors.extend_from_slice(&rustc_metadata::DIAGNOSTICS);
1724 all_errors.extend_from_slice(&rustc_passes::DIAGNOSTICS);
1725 all_errors.extend_from_slice(&rustc_plugin::DIAGNOSTICS);
1726 all_errors.extend_from_slice(&rustc_mir::DIAGNOSTICS);
1727 all_errors.extend_from_slice(&syntax::DIAGNOSTICS);
1729 Registry::new(&all_errors)
1732 /// This allows tools to enable rust logging without having to magically match rustc's
1733 /// log crate version
1734 pub fn init_rustc_env_logger() {
1739 init_rustc_env_logger();
1740 let result = run(|| {
1741 let args = env::args_os().enumerate()
1742 .map(|(i, arg)| arg.into_string().unwrap_or_else(|arg| {
1743 early_error(ErrorOutputType::default(),
1744 &format!("Argument {} is not valid Unicode: {:?}", i, arg))
1746 .collect::<Vec<_>>();
1748 Box::new(RustcDefaultCalls),
1752 process::exit(result as i32);