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))]
25 #![feature(rustc_diagnostic_macros)]
26 #![feature(slice_sort_by_cached_key)]
27 #![feature(set_stdio)]
28 #![feature(rustc_stack_internals)]
31 #![recursion_limit="256"]
34 pub extern crate getopts;
35 extern crate graphviz;
36 extern crate env_logger;
39 extern crate rustc_rayon as rayon;
41 extern crate rustc_allocator;
42 extern crate rustc_target;
43 extern crate rustc_borrowck;
44 extern crate rustc_data_structures;
45 extern crate rustc_errors as errors;
46 extern crate rustc_passes;
47 extern crate rustc_lint;
48 extern crate rustc_plugin;
49 extern crate rustc_privacy;
50 extern crate rustc_incremental;
51 extern crate rustc_metadata;
52 extern crate rustc_mir;
53 extern crate rustc_resolve;
54 extern crate rustc_save_analysis;
55 extern crate rustc_traits;
56 extern crate rustc_codegen_utils;
57 extern crate rustc_typeck;
58 extern crate scoped_tls;
59 extern crate serialize;
60 extern crate smallvec;
64 extern crate syntax_ext;
65 extern crate syntax_pos;
67 // Note that the linkage here should be all that we need, on Linux we're not
68 // prefixing the symbols here so this should naturally override our default
69 // allocator. On OSX it should override via the zone allocator. We shouldn't
70 // enable this by default on other platforms, so other platforms aren't handled
72 #[cfg(feature = "jemalloc-sys")]
73 extern crate jemalloc_sys;
75 use driver::CompileController;
76 use pretty::{PpMode, UserIdentifiedItem};
78 use rustc_resolve as resolve;
79 use rustc_save_analysis as save;
80 use rustc_save_analysis::DumpHandler;
81 use rustc_data_structures::sync::{self, Lrc};
82 use rustc_data_structures::OnDrop;
83 use rustc::session::{self, config, Session, build_session, CompileResult};
84 use rustc::session::CompileIncomplete;
85 use rustc::session::config::{Input, PrintRequest, ErrorOutputType};
86 use rustc::session::config::nightly_options;
87 use rustc::session::filesearch;
88 use rustc::session::{early_error, early_warn};
89 use rustc::lint::Lint;
91 use rustc_metadata::locator;
92 use rustc_metadata::cstore::CStore;
93 use rustc_metadata::dynamic_lib::DynamicLibrary;
94 use rustc::util::common::{time, ErrorReported};
95 use rustc_codegen_utils::codegen_backend::CodegenBackend;
97 use serialize::json::ToJson;
100 use std::borrow::Cow;
102 use std::default::Default;
103 use std::env::consts::{DLL_PREFIX, DLL_SUFFIX};
105 use std::error::Error;
106 use std::ffi::OsString;
107 use std::fmt::{self, Display};
108 use std::io::{self, Read, Write};
111 use std::path::{PathBuf, Path};
112 use std::process::{self, Command, Stdio};
114 use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
115 use std::sync::{Once, ONCE_INIT};
119 use syntax::source_map::{SourceMap, FileLoader, RealFileLoader};
120 use syntax::feature_gate::{GatedCfg, UnstableFeatures};
121 use syntax::parse::{self, PResult};
122 use syntax_pos::{DUMMY_SP, MultiSpan, FileName};
130 mod proc_macro_decls;
132 pub mod target_features {
134 use syntax::symbol::Symbol;
135 use rustc::session::Session;
136 use rustc_codegen_utils::codegen_backend::CodegenBackend;
138 /// Add `target_feature = "..."` cfgs for a variety of platform
139 /// specific features (SSE, NEON etc.).
141 /// This is performed by checking whether a whitelisted set of
142 /// features is available on the target machine, by querying LLVM.
143 pub fn add_configuration(cfg: &mut ast::CrateConfig,
145 codegen_backend: &dyn CodegenBackend) {
146 let tf = Symbol::intern("target_feature");
148 cfg.extend(codegen_backend.target_features(sess).into_iter().map(|feat| (tf, Some(feat))));
150 if sess.crt_static_feature() {
151 cfg.insert((tf, Some(Symbol::intern("crt-static"))));
156 /// Exit status code used for successful compilation and help output.
157 pub const EXIT_SUCCESS: isize = 0;
159 /// Exit status code used for compilation failures and invalid flags.
160 pub const EXIT_FAILURE: isize = 1;
162 const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.\
165 const ICE_REPORT_COMPILER_FLAGS: &[&str] = &["Z", "C", "crate-type"];
167 const ICE_REPORT_COMPILER_FLAGS_EXCLUDE: &[&str] = &["metadata", "extra-filename"];
169 const ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE: &[&str] = &["incremental"];
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 syntax::with_globals(|| {
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(
199 errors::ColorConfig::Auto,
204 let handler = errors::Handler::with_emitter(true, false, Box::new(emitter));
205 handler.emit(&MultiSpan::new(),
206 "aborting due to previous error(s)",
207 errors::Level::Fatal);
208 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
216 Ok(()) => EXIT_SUCCESS,
217 Err(_) => EXIT_FAILURE,
221 fn load_backend_from_dylib(path: &Path) -> fn() -> Box<dyn CodegenBackend> {
222 // Note that we're specifically using `open_global_now` here rather than
223 // `open`, namely we want the behavior on Unix of RTLD_GLOBAL and RTLD_NOW,
224 // where NOW means "bind everything right now" because we don't want
225 // surprises later on and RTLD_GLOBAL allows the symbols to be made
226 // available for future dynamic libraries opened. This is currently used by
227 // loading LLVM and then making its symbols available for other dynamic
229 let lib = DynamicLibrary::open_global_now(path).unwrap_or_else(|err| {
230 let err = format!("couldn't load codegen backend {:?}: {:?}", path, err);
231 early_error(ErrorOutputType::default(), &err);
234 match lib.symbol("__rustc_codegen_backend") {
237 mem::transmute::<*mut u8, _>(f)
240 let err = format!("couldn't load codegen backend as it \
241 doesn't export the `__rustc_codegen_backend` \
243 early_error(ErrorOutputType::default(), &err);
249 pub fn get_codegen_backend(sess: &Session) -> Box<dyn CodegenBackend> {
250 static INIT: Once = ONCE_INIT;
254 static mut LOAD: fn() -> Box<dyn CodegenBackend> = || unreachable!();
257 let codegen_name = sess.opts.debugging_opts.codegen_backend.as_ref()
258 .unwrap_or(&sess.target.target.options.codegen_backend);
259 let backend = match &codegen_name[..] {
261 rustc_codegen_utils::codegen_backend::MetadataOnlyCodegenBackend::boxed
263 filename if filename.contains(".") => {
264 load_backend_from_dylib(filename.as_ref())
266 codegen_name => get_codegen_sysroot(codegen_name),
273 let backend = unsafe { LOAD() };
278 fn get_codegen_sysroot(backend_name: &str) -> fn() -> Box<dyn CodegenBackend> {
279 // For now we only allow this function to be called once as it'll dlopen a
280 // few things, which seems to work best if we only do that once. In
281 // general this assertion never trips due to the once guard in `get_codegen_backend`,
282 // but there's a few manual calls to this function in this file we protect
284 static LOADED: AtomicBool = ATOMIC_BOOL_INIT;
285 assert!(!LOADED.fetch_or(true, Ordering::SeqCst),
286 "cannot load the default codegen backend twice");
288 // When we're compiling this library with `--test` it'll run as a binary but
289 // not actually exercise much functionality. As a result most of the logic
290 // here is defunkt (it assumes we're a dynamic library in a sysroot) so
291 // let's just return a dummy creation function which won't be used in
294 return rustc_codegen_utils::codegen_backend::MetadataOnlyCodegenBackend::boxed
297 let target = session::config::host_triple();
298 let mut sysroot_candidates = vec![filesearch::get_or_default_sysroot()];
299 let path = current_dll_path()
300 .and_then(|s| s.canonicalize().ok());
301 if let Some(dll) = path {
302 // use `parent` twice to chop off the file name and then also the
303 // directory containing the dll which should be either `lib` or `bin`.
304 if let Some(path) = dll.parent().and_then(|p| p.parent()) {
305 // The original `path` pointed at the `rustc_driver` crate's dll.
306 // Now that dll should only be in one of two locations. The first is
307 // in the compiler's libdir, for example `$sysroot/lib/*.dll`. The
308 // other is the target's libdir, for example
309 // `$sysroot/lib/rustlib/$target/lib/*.dll`.
311 // We don't know which, so let's assume that if our `path` above
312 // ends in `$target` we *could* be in the target libdir, and always
313 // assume that we may be in the main libdir.
314 sysroot_candidates.push(path.to_owned());
316 if path.ends_with(target) {
317 sysroot_candidates.extend(path.parent() // chop off `$target`
318 .and_then(|p| p.parent()) // chop off `rustlib`
319 .and_then(|p| p.parent()) // chop off `lib`
320 .map(|s| s.to_owned()));
325 let sysroot = sysroot_candidates.iter()
327 let libdir = filesearch::relative_target_lib_path(&sysroot, &target);
328 sysroot.join(libdir).with_file_name(
329 option_env!("CFG_CODEGEN_BACKENDS_DIR").unwrap_or("codegen-backends"))
332 info!("codegen backend candidate: {}", f.display());
336 let sysroot = sysroot.unwrap_or_else(|| {
337 let candidates = sysroot_candidates.iter()
338 .map(|p| p.display().to_string())
341 let err = format!("failed to find a `codegen-backends` folder \
342 in the sysroot candidates:\n* {}", candidates);
343 early_error(ErrorOutputType::default(), &err);
345 info!("probing {} for a codegen backend", sysroot.display());
347 let d = sysroot.read_dir().unwrap_or_else(|e| {
348 let err = format!("failed to load default codegen backend, couldn't \
349 read `{}`: {}", sysroot.display(), e);
350 early_error(ErrorOutputType::default(), &err);
353 let mut file: Option<PathBuf> = None;
355 let expected_name = format!("rustc_codegen_llvm-{}", backend_name);
356 for entry in d.filter_map(|e| e.ok()) {
357 let path = entry.path();
358 let filename = match path.file_name().and_then(|s| s.to_str()) {
362 if !(filename.starts_with(DLL_PREFIX) && filename.ends_with(DLL_SUFFIX)) {
365 let name = &filename[DLL_PREFIX.len() .. filename.len() - DLL_SUFFIX.len()];
366 if name != expected_name {
369 if let Some(ref prev) = file {
370 let err = format!("duplicate codegen backends found\n\
373 ", prev.display(), path.display());
374 early_error(ErrorOutputType::default(), &err);
376 file = Some(path.clone());
380 Some(ref s) => return load_backend_from_dylib(s),
382 let err = format!("failed to load default codegen backend for `{}`, \
383 no appropriate codegen dylib found in `{}`",
384 backend_name, sysroot.display());
385 early_error(ErrorOutputType::default(), &err);
390 fn current_dll_path() -> Option<PathBuf> {
391 use std::ffi::{OsStr, CStr};
392 use std::os::unix::prelude::*;
395 let addr = current_dll_path as usize as *mut _;
396 let mut info = mem::zeroed();
397 if libc::dladdr(addr, &mut info) == 0 {
398 info!("dladdr failed");
401 if info.dli_fname.is_null() {
402 info!("dladdr returned null pointer");
405 let bytes = CStr::from_ptr(info.dli_fname).to_bytes();
406 let os = OsStr::from_bytes(bytes);
407 Some(PathBuf::from(os))
412 fn current_dll_path() -> Option<PathBuf> {
413 use std::ffi::OsString;
414 use std::os::windows::prelude::*;
417 fn GetModuleHandleExW(dwFlags: u32,
419 phModule: *mut usize) -> i32;
420 fn GetModuleFileNameW(hModule: usize,
421 lpFilename: *mut u16,
425 const GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS: u32 = 0x00000004;
429 let r = GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
430 current_dll_path as usize,
433 info!("GetModuleHandleExW failed: {}", io::Error::last_os_error());
436 let mut space = Vec::with_capacity(1024);
437 let r = GetModuleFileNameW(module,
439 space.capacity() as u32);
441 info!("GetModuleFileNameW failed: {}", io::Error::last_os_error());
445 if r >= space.capacity() {
446 info!("our buffer was too small? {}",
447 io::Error::last_os_error());
451 let os = OsString::from_wide(&space);
452 Some(PathBuf::from(os))
457 // Parse args and run the compiler. This is the primary entry point for rustc.
458 // See comments on CompilerCalls below for details about the callbacks argument.
459 // The FileLoader provides a way to load files from sources other than the file system.
460 pub fn run_compiler<'a>(args: &[String],
461 callbacks: Box<dyn CompilerCalls<'a> + sync::Send + 'a>,
462 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
463 emitter_dest: Option<Box<dyn Write + Send>>)
464 -> (CompileResult, Option<Session>)
466 let matches = match handle_options(args) {
467 Some(matches) => matches,
468 None => return (Ok(()), None),
471 let (sopts, cfg) = config::build_session_options_and_crate_config(&matches);
473 driver::spawn_thread_pool(sopts, |sopts| {
474 run_compiler_with_pool(matches, sopts, cfg, callbacks, file_loader, emitter_dest)
478 fn run_compiler_with_pool<'a>(
479 matches: getopts::Matches,
480 sopts: config::Options,
481 cfg: ast::CrateConfig,
482 mut callbacks: Box<dyn CompilerCalls<'a> + sync::Send + 'a>,
483 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
484 emitter_dest: Option<Box<dyn Write + Send>>
485 ) -> (CompileResult, Option<Session>) {
486 macro_rules! do_or_return {($expr: expr, $sess: expr) => {
488 Compilation::Stop => return (Ok(()), $sess),
489 Compilation::Continue => {}
493 let descriptions = diagnostics_registry();
495 do_or_return!(callbacks.early_callback(&matches,
502 let (odir, ofile) = make_output(&matches);
503 let (input, input_file_path, input_err) = match make_input(&matches.free) {
504 Some((input, input_file_path, input_err)) => {
505 let (input, input_file_path) = callbacks.some_input(input, input_file_path);
506 (input, input_file_path, input_err)
508 None => match callbacks.no_input(&matches, &sopts, &cfg, &odir, &ofile, &descriptions) {
509 Some((input, input_file_path)) => (input, input_file_path, None),
510 None => return (Ok(()), None),
514 let loader = file_loader.unwrap_or(box RealFileLoader);
515 let source_map = Lrc::new(SourceMap::with_file_loader(loader, sopts.file_path_mapping()));
516 let mut sess = session::build_session_with_source_map(
517 sopts, input_file_path.clone(), descriptions, source_map, emitter_dest,
520 if let Some(err) = input_err {
521 // Immediately stop compilation if there was an issue reading
522 // the input (for example if the input stream is not UTF-8).
523 sess.err(&err.to_string());
524 return (Err(CompileIncomplete::Stopped), Some(sess));
527 let codegen_backend = get_codegen_backend(&sess);
529 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
531 let mut cfg = config::build_configuration(&sess, cfg);
532 target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
533 sess.parse_sess.config = cfg;
536 let plugins = sess.opts.debugging_opts.extra_plugins.clone();
538 let cstore = CStore::new(codegen_backend.metadata_loader());
540 do_or_return!(callbacks.late_callback(&*codegen_backend,
546 &ofile), Some(sess));
548 let _sess_abort_error = OnDrop(|| sess.diagnostic().print_error_count());
550 let control = callbacks.build_controller(&sess, &matches);
552 driver::compile_input(codegen_backend,
567 pub fn set_sigpipe_handler() {
569 // Set the SIGPIPE signal handler, so that an EPIPE
570 // will cause rustc to terminate, as expected.
571 assert_ne!(libc::signal(libc::SIGPIPE, libc::SIG_DFL), libc::SIG_ERR);
576 pub fn set_sigpipe_handler() {}
578 // Extract output directory and file from matches.
579 fn make_output(matches: &getopts::Matches) -> (Option<PathBuf>, Option<PathBuf>) {
580 let odir = matches.opt_str("out-dir").map(|o| PathBuf::from(&o));
581 let ofile = matches.opt_str("o").map(|o| PathBuf::from(&o));
585 // Extract input (string or file and optional path) from matches.
586 fn make_input(free_matches: &[String]) -> Option<(Input, Option<PathBuf>, Option<io::Error>)> {
587 if free_matches.len() == 1 {
588 let ifile = &free_matches[0];
590 let mut src = String::new();
591 let err = if io::stdin().read_to_string(&mut src).is_err() {
592 Some(io::Error::new(io::ErrorKind::InvalidData,
593 "couldn't read from stdin, as it did not contain valid UTF-8"))
597 Some((Input::Str { name: FileName::anon_source_code(&src), input: src },
600 Some((Input::File(PathBuf::from(ifile)),
601 Some(PathBuf::from(ifile)), None))
608 fn parse_pretty(sess: &Session,
609 matches: &getopts::Matches)
610 -> Option<(PpMode, Option<UserIdentifiedItem>)> {
611 let pretty = if sess.opts.debugging_opts.unstable_options {
612 matches.opt_default("pretty", "normal").map(|a| {
613 // stable pretty-print variants only
614 pretty::parse_pretty(sess, &a, false)
620 if pretty.is_none() {
621 sess.opts.debugging_opts.unpretty.as_ref().map(|a| {
622 // extended with unstable pretty-print variants
623 pretty::parse_pretty(sess, &a, true)
630 // Whether to stop or continue compilation.
631 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
632 pub enum Compilation {
638 pub fn and_then<F: FnOnce() -> Compilation>(self, next: F) -> Compilation {
640 Compilation::Stop => Compilation::Stop,
641 Compilation::Continue => next(),
646 /// A trait for customizing the compilation process. Offers a number of hooks for
647 /// executing custom code or customizing input.
648 pub trait CompilerCalls<'a> {
649 /// Hook for a callback early in the process of handling arguments. This will
650 /// be called straight after options have been parsed but before anything
651 /// else (e.g., selecting input and output).
652 fn early_callback(&mut self,
653 _: &getopts::Matches,
655 _: &ast::CrateConfig,
656 _: &errors::registry::Registry,
659 Compilation::Continue
662 /// Hook for a callback late in the process of handling arguments. This will
663 /// be called just before actual compilation starts (and before build_controller
664 /// is called), after all arguments etc. have been completely handled.
665 fn late_callback(&mut self,
666 _: &dyn CodegenBackend,
667 _: &getopts::Matches,
674 Compilation::Continue
677 /// Called after we extract the input from the arguments. Gives the implementer
678 /// an opportunity to change the inputs or to add some custom input handling.
679 /// The default behaviour is to simply pass through the inputs.
680 fn some_input(&mut self,
682 input_path: Option<PathBuf>)
683 -> (Input, Option<PathBuf>) {
687 /// Called after we extract the input from the arguments if there is no valid
688 /// input. Gives the implementer an opportunity to supply alternate input (by
689 /// returning a Some value) or to add custom behaviour for this error such as
690 /// emitting error messages. Returning None will cause compilation to stop
692 fn no_input(&mut self,
693 _: &getopts::Matches,
695 _: &ast::CrateConfig,
698 _: &errors::registry::Registry)
699 -> Option<(Input, Option<PathBuf>)> {
703 // Create a CompilController struct for controlling the behaviour of
709 ) -> CompileController<'a>;
712 /// CompilerCalls instance for a regular rustc build.
713 #[derive(Copy, Clone)]
714 pub struct RustcDefaultCalls;
716 // FIXME remove these and use winapi 0.3 instead
717 // Duplicates: bootstrap/compile.rs, librustc_errors/emitter.rs
719 fn stdout_isatty() -> bool {
720 unsafe { libc::isatty(libc::STDOUT_FILENO) != 0 }
724 fn stdout_isatty() -> bool {
727 type HANDLE = *mut u8;
728 type LPDWORD = *mut u32;
729 const STD_OUTPUT_HANDLE: DWORD = -11i32 as DWORD;
731 fn GetStdHandle(which: DWORD) -> HANDLE;
732 fn GetConsoleMode(hConsoleHandle: HANDLE, lpMode: LPDWORD) -> BOOL;
735 let handle = GetStdHandle(STD_OUTPUT_HANDLE);
737 GetConsoleMode(handle, &mut out) != 0
741 fn handle_explain(code: &str,
742 descriptions: &errors::registry::Registry,
743 output: ErrorOutputType) {
744 let normalised = if code.starts_with("E") {
747 format!("E{0:0>4}", code)
749 match descriptions.find_description(&normalised) {
750 Some(ref description) => {
751 let mut is_in_code_block = false;
752 let mut text = String::new();
754 // Slice off the leading newline and print.
755 for line in description[1..].lines() {
756 let indent_level = line.find(|c: char| !c.is_whitespace())
757 .unwrap_or_else(|| line.len());
758 let dedented_line = &line[indent_level..];
759 if dedented_line.starts_with("```") {
760 is_in_code_block = !is_in_code_block;
761 text.push_str(&line[..(indent_level+3)]);
762 } else if is_in_code_block && dedented_line.starts_with("# ") {
771 show_content_with_pager(&text);
777 early_error(output, &format!("no extended information for {}", code));
782 fn show_content_with_pager(content: &String) {
783 let pager_name = env::var_os("PAGER").unwrap_or_else(|| if cfg!(windows) {
784 OsString::from("more.com")
786 OsString::from("less")
789 let mut fallback_to_println = false;
791 match Command::new(pager_name).stdin(Stdio::piped()).spawn() {
793 if let Some(pipe) = pager.stdin.as_mut() {
794 if pipe.write_all(content.as_bytes()).is_err() {
795 fallback_to_println = true;
799 if pager.wait().is_err() {
800 fallback_to_println = true;
804 fallback_to_println = true;
808 // If pager fails for whatever reason, we should still print the content
809 // to standard output
810 if fallback_to_println {
811 print!("{}", content);
815 impl<'a> CompilerCalls<'a> for RustcDefaultCalls {
816 fn early_callback(&mut self,
817 matches: &getopts::Matches,
819 _: &ast::CrateConfig,
820 descriptions: &errors::registry::Registry,
821 output: ErrorOutputType)
823 if let Some(ref code) = matches.opt_str("explain") {
824 handle_explain(code, descriptions, output);
825 return Compilation::Stop;
828 Compilation::Continue
831 fn no_input(&mut self,
832 matches: &getopts::Matches,
833 sopts: &config::Options,
834 cfg: &ast::CrateConfig,
835 odir: &Option<PathBuf>,
836 ofile: &Option<PathBuf>,
837 descriptions: &errors::registry::Registry)
838 -> Option<(Input, Option<PathBuf>)> {
839 match matches.free.len() {
841 let mut sess = build_session(sopts.clone(),
843 descriptions.clone());
844 if sopts.describe_lints {
845 let mut ls = lint::LintStore::new();
846 rustc_lint::register_builtins(&mut ls, Some(&sess));
847 describe_lints(&sess, &ls, false);
850 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
851 let mut cfg = config::build_configuration(&sess, cfg.clone());
852 let codegen_backend = get_codegen_backend(&sess);
853 target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
854 sess.parse_sess.config = cfg;
855 let should_stop = RustcDefaultCalls::print_crate_info(
863 if should_stop == Compilation::Stop {
866 early_error(sopts.error_format, "no input filename given");
868 1 => panic!("make_input should have provided valid inputs"),
869 _ => early_error(sopts.error_format, "multiple input filenames provided"),
873 fn late_callback(&mut self,
874 codegen_backend: &dyn CodegenBackend,
875 matches: &getopts::Matches,
879 odir: &Option<PathBuf>,
880 ofile: &Option<PathBuf>)
882 RustcDefaultCalls::print_crate_info(codegen_backend, sess, Some(input), odir, ofile)
883 .and_then(|| RustcDefaultCalls::list_metadata(sess, cstore, matches, input))
886 fn build_controller(self: Box<Self>,
888 matches: &getopts::Matches)
889 -> CompileController<'a> {
890 let mut control = CompileController::basic();
892 control.keep_ast = sess.opts.debugging_opts.keep_ast;
893 control.continue_parse_after_error = sess.opts.debugging_opts.continue_parse_after_error;
895 if let Some((ppm, opt_uii)) = parse_pretty(sess, matches) {
896 if ppm.needs_ast_map(&opt_uii) {
897 control.after_hir_lowering.stop = Compilation::Stop;
899 control.after_parse.callback = box move |state| {
900 state.krate = Some(pretty::fold_crate(state.session,
901 state.krate.take().unwrap(),
904 control.after_hir_lowering.callback = box move |state| {
905 pretty::print_after_hir_lowering(state.session,
906 state.cstore.unwrap(),
907 state.hir_map.unwrap(),
908 state.analysis.unwrap(),
909 state.resolutions.unwrap(),
911 &state.expanded_crate.take().unwrap(),
912 state.crate_name.unwrap(),
914 state.output_filenames.unwrap(),
919 control.after_parse.stop = Compilation::Stop;
921 control.after_parse.callback = box move |state| {
922 let krate = pretty::fold_crate(state.session, state.krate.take().unwrap(), ppm);
923 pretty::print_after_parsing(state.session,
934 if sess.opts.debugging_opts.parse_only ||
935 sess.opts.debugging_opts.show_span.is_some() ||
936 sess.opts.debugging_opts.ast_json_noexpand {
937 control.after_parse.stop = Compilation::Stop;
940 if sess.opts.debugging_opts.no_analysis ||
941 sess.opts.debugging_opts.ast_json {
942 control.after_hir_lowering.stop = Compilation::Stop;
945 if sess.opts.debugging_opts.save_analysis {
946 enable_save_analysis(&mut control);
949 if sess.print_fuel_crate.is_some() {
950 let old_callback = control.compilation_done.callback;
951 control.compilation_done.callback = box move |state| {
953 let sess = state.session;
954 eprintln!("Fuel used by {}: {}",
955 sess.print_fuel_crate.as_ref().unwrap(),
956 sess.print_fuel.get());
963 pub fn enable_save_analysis(control: &mut CompileController) {
964 control.keep_ast = true;
965 control.after_analysis.callback = box |state| {
966 time(state.session, "save analysis", || {
967 save::process_crate(state.tcx.unwrap(),
968 state.expanded_crate.unwrap(),
969 state.analysis.unwrap(),
970 state.crate_name.unwrap(),
973 DumpHandler::new(state.out_dir,
974 state.crate_name.unwrap()))
977 control.after_analysis.run_callback_on_error = true;
978 control.make_glob_map = resolve::MakeGlobMap::Yes;
981 impl RustcDefaultCalls {
982 pub fn list_metadata(sess: &Session,
984 matches: &getopts::Matches,
987 let r = matches.opt_strs("Z");
988 if r.iter().any(|s| *s == "ls") {
990 &Input::File(ref ifile) => {
991 let path = &(*ifile);
992 let mut v = Vec::new();
993 locator::list_file_metadata(&sess.target.target,
995 &*cstore.metadata_loader,
998 println!("{}", String::from_utf8(v).unwrap());
1000 &Input::Str { .. } => {
1001 early_error(ErrorOutputType::default(), "cannot list metadata for stdin");
1004 return Compilation::Stop;
1007 Compilation::Continue
1011 fn print_crate_info(codegen_backend: &dyn CodegenBackend,
1013 input: Option<&Input>,
1014 odir: &Option<PathBuf>,
1015 ofile: &Option<PathBuf>)
1017 use rustc::session::config::PrintRequest::*;
1018 // PrintRequest::NativeStaticLibs is special - printed during linking
1019 // (empty iterator returns true)
1020 if sess.opts.prints.iter().all(|&p| p == PrintRequest::NativeStaticLibs) {
1021 return Compilation::Continue;
1024 let attrs = match input {
1027 let result = parse_crate_attrs(sess, input);
1029 Ok(attrs) => Some(attrs),
1030 Err(mut parse_error) => {
1032 return Compilation::Stop;
1037 for req in &sess.opts.prints {
1040 let mut targets = rustc_target::spec::get_targets().collect::<Vec<String>>();
1042 println!("{}", targets.join("\n"));
1044 Sysroot => println!("{}", sess.sysroot.display()),
1045 TargetSpec => println!("{}", sess.target.target.to_json().pretty()),
1046 FileNames | CrateName => {
1047 let input = input.unwrap_or_else(||
1048 early_error(ErrorOutputType::default(), "no input file provided"));
1049 let attrs = attrs.as_ref().unwrap();
1050 let t_outputs = driver::build_output_filenames(input, odir, ofile, attrs, sess);
1051 let id = rustc_codegen_utils::link::find_crate_name(Some(sess), attrs, input);
1052 if *req == PrintRequest::CrateName {
1056 let crate_types = driver::collect_crate_types(sess, attrs);
1057 for &style in &crate_types {
1058 let fname = rustc_codegen_utils::link::filename_for_input(
1064 println!("{}", fname.file_name().unwrap().to_string_lossy());
1068 let allow_unstable_cfg = UnstableFeatures::from_environment()
1069 .is_nightly_build();
1071 let mut cfgs = sess.parse_sess.config.iter().filter_map(|&(name, ref value)| {
1072 let gated_cfg = GatedCfg::gate(&ast::MetaItem {
1073 ident: ast::Path::from_ident(ast::Ident::with_empty_ctxt(name)),
1074 node: ast::MetaItemKind::Word,
1078 // Note that crt-static is a specially recognized cfg
1079 // directive that's printed out here as part of
1080 // rust-lang/rust#37406, but in general the
1081 // `target_feature` cfg is gated under
1082 // rust-lang/rust#29717. For now this is just
1083 // specifically allowing the crt-static cfg and that's
1084 // it, this is intended to get into Cargo and then go
1085 // through to build scripts.
1086 let value = value.as_ref().map(|s| s.as_str());
1087 let value = value.as_ref().map(|s| s.as_ref());
1088 if name != "target_feature" || value != Some("crt-static") {
1089 if !allow_unstable_cfg && gated_cfg.is_some() {
1094 if let Some(value) = value {
1095 Some(format!("{}=\"{}\"", name, value))
1097 Some(name.to_string())
1099 }).collect::<Vec<String>>();
1103 println!("{}", cfg);
1106 RelocationModels | CodeModels | TlsModels | TargetCPUs | TargetFeatures => {
1107 codegen_backend.print(*req, sess);
1109 // Any output here interferes with Cargo's parsing of other printed output
1110 PrintRequest::NativeStaticLibs => {}
1113 return Compilation::Stop;
1117 /// Returns a version string such as "0.12.0-dev".
1118 fn release_str() -> Option<&'static str> {
1119 option_env!("CFG_RELEASE")
1122 /// Returns the full SHA1 hash of HEAD of the Git repo from which rustc was built.
1123 fn commit_hash_str() -> Option<&'static str> {
1124 option_env!("CFG_VER_HASH")
1127 /// Returns the "commit date" of HEAD of the Git repo from which rustc was built as a static string.
1128 fn commit_date_str() -> Option<&'static str> {
1129 option_env!("CFG_VER_DATE")
1132 /// Prints version information
1133 pub fn version(binary: &str, matches: &getopts::Matches) {
1134 let verbose = matches.opt_present("verbose");
1136 println!("{} {}", binary, option_env!("CFG_VERSION").unwrap_or("unknown version"));
1139 fn unw(x: Option<&str>) -> &str {
1140 x.unwrap_or("unknown")
1142 println!("binary: {}", binary);
1143 println!("commit-hash: {}", unw(commit_hash_str()));
1144 println!("commit-date: {}", unw(commit_date_str()));
1145 println!("host: {}", config::host_triple());
1146 println!("release: {}", unw(release_str()));
1147 get_codegen_sysroot("llvm")().print_version();
1151 fn usage(verbose: bool, include_unstable_options: bool) {
1152 let groups = if verbose {
1153 config::rustc_optgroups()
1155 config::rustc_short_optgroups()
1157 let mut options = getopts::Options::new();
1158 for option in groups.iter().filter(|x| include_unstable_options || x.is_stable()) {
1159 (option.apply)(&mut options);
1161 let message = "Usage: rustc [OPTIONS] INPUT";
1162 let nightly_help = if nightly_options::is_nightly_build() {
1163 "\n -Z help Print internal options for debugging rustc"
1167 let verbose_help = if verbose {
1170 "\n --help -v Print the full set of options rustc accepts"
1172 println!("{}\nAdditional help:
1173 -C help Print codegen options
1175 Print 'lint' options and default settings{}{}\n",
1176 options.usage(message),
1181 fn print_wall_help() {
1183 The flag `-Wall` does not exist in `rustc`. Most useful lints are enabled by
1184 default. Use `rustc -W help` to see all available lints. It's more common to put
1185 warning settings in the crate root using `#![warn(LINT_NAME)]` instead of using
1186 the command line flag directly.
1190 fn describe_lints(sess: &Session, lint_store: &lint::LintStore, loaded_plugins: bool) {
1192 Available lint options:
1193 -W <foo> Warn about <foo>
1197 -F <foo> Forbid <foo> \
1198 (deny <foo> and all attempts to override)
1202 fn sort_lints(sess: &Session, lints: Vec<(&'static Lint, bool)>) -> Vec<&'static Lint> {
1203 let mut lints: Vec<_> = lints.into_iter().map(|(x, _)| x).collect();
1204 // The sort doesn't case-fold but it's doubtful we care.
1205 lints.sort_by_cached_key(|x: &&Lint| (x.default_level(sess), x.name));
1209 fn sort_lint_groups(lints: Vec<(&'static str, Vec<lint::LintId>, bool)>)
1210 -> Vec<(&'static str, Vec<lint::LintId>)> {
1211 let mut lints: Vec<_> = lints.into_iter().map(|(x, y, _)| (x, y)).collect();
1212 lints.sort_by_key(|l| l.0);
1216 let (plugin, builtin): (Vec<_>, _) = lint_store.get_lints()
1219 .partition(|&(_, p)| p);
1220 let plugin = sort_lints(sess, plugin);
1221 let builtin = sort_lints(sess, builtin);
1223 let (plugin_groups, builtin_groups): (Vec<_>, _) = lint_store.get_lint_groups()
1226 .partition(|&(.., p)| p);
1227 let plugin_groups = sort_lint_groups(plugin_groups);
1228 let builtin_groups = sort_lint_groups(builtin_groups);
1230 let max_name_len = plugin.iter()
1232 .map(|&s| s.name.chars().count())
1235 let padded = |x: &str| {
1236 let mut s = " ".repeat(max_name_len - x.chars().count());
1241 println!("Lint checks provided by rustc:\n");
1242 println!(" {} {:7.7} {}", padded("name"), "default", "meaning");
1243 println!(" {} {:7.7} {}", padded("----"), "-------", "-------");
1245 let print_lints = |lints: Vec<&Lint>| {
1247 let name = lint.name_lower().replace("_", "-");
1248 println!(" {} {:7.7} {}",
1250 lint.default_level.as_str(),
1256 print_lints(builtin);
1258 let max_name_len = max("warnings".len(),
1259 plugin_groups.iter()
1260 .chain(&builtin_groups)
1261 .map(|&(s, _)| s.chars().count())
1265 let padded = |x: &str| {
1266 let mut s = " ".repeat(max_name_len - x.chars().count());
1271 println!("Lint groups provided by rustc:\n");
1272 println!(" {} {}", padded("name"), "sub-lints");
1273 println!(" {} {}", padded("----"), "---------");
1274 println!(" {} {}", padded("warnings"), "all lints that are set to issue warnings");
1276 let print_lint_groups = |lints: Vec<(&'static str, Vec<lint::LintId>)>| {
1277 for (name, to) in lints {
1278 let name = name.to_lowercase().replace("_", "-");
1279 let desc = to.into_iter()
1280 .map(|x| x.to_string().replace("_", "-"))
1281 .collect::<Vec<String>>()
1283 println!(" {} {}", padded(&name), desc);
1288 print_lint_groups(builtin_groups);
1290 match (loaded_plugins, plugin.len(), plugin_groups.len()) {
1291 (false, 0, _) | (false, _, 0) => {
1292 println!("Compiler plugins can provide additional lints and lint groups. To see a \
1293 listing of these, re-run `rustc -W help` with a crate filename.");
1295 (false, ..) => panic!("didn't load lint plugins but got them anyway!"),
1296 (true, 0, 0) => println!("This crate does not load any lint plugins or lint groups."),
1299 println!("Lint checks provided by plugins loaded by this crate:\n");
1300 print_lints(plugin);
1303 println!("Lint groups provided by plugins loaded by this crate:\n");
1304 print_lint_groups(plugin_groups);
1310 fn describe_debug_flags() {
1311 println!("\nAvailable debug options:\n");
1312 print_flag_list("-Z", config::DB_OPTIONS);
1315 fn describe_codegen_flags() {
1316 println!("\nAvailable codegen options:\n");
1317 print_flag_list("-C", config::CG_OPTIONS);
1320 fn print_flag_list<T>(cmdline_opt: &str,
1321 flag_list: &[(&'static str, T, Option<&'static str>, &'static str)]) {
1322 let max_len = flag_list.iter()
1323 .map(|&(name, _, opt_type_desc, _)| {
1324 let extra_len = match opt_type_desc {
1328 name.chars().count() + extra_len
1333 for &(name, _, opt_type_desc, desc) in flag_list {
1334 let (width, extra) = match opt_type_desc {
1335 Some(..) => (max_len - 4, "=val"),
1336 None => (max_len, ""),
1338 println!(" {} {:>width$}{} -- {}",
1340 name.replace("_", "-"),
1347 /// Process command line options. Emits messages as appropriate. If compilation
1348 /// should continue, returns a getopts::Matches object parsed from args,
1349 /// otherwise returns None.
1351 /// The compiler's handling of options is a little complicated as it ties into
1352 /// our stability story, and it's even *more* complicated by historical
1353 /// accidents. The current intention of each compiler option is to have one of
1356 /// 1. An option is stable and can be used everywhere.
1357 /// 2. An option is unstable, but was historically allowed on the stable
1359 /// 3. An option is unstable, and can only be used on nightly.
1361 /// Like unstable library and language features, however, unstable options have
1362 /// always required a form of "opt in" to indicate that you're using them. This
1363 /// provides the easy ability to scan a code base to check to see if anything
1364 /// unstable is being used. Currently, this "opt in" is the `-Z` "zed" flag.
1366 /// All options behind `-Z` are considered unstable by default. Other top-level
1367 /// options can also be considered unstable, and they were unlocked through the
1368 /// `-Z unstable-options` flag. Note that `-Z` remains to be the root of
1369 /// instability in both cases, though.
1371 /// So with all that in mind, the comments below have some more detail about the
1372 /// contortions done here to get things to work out correctly.
1373 pub fn handle_options(args: &[String]) -> Option<getopts::Matches> {
1374 // Throw away the first argument, the name of the binary
1375 let args = &args[1..];
1377 if args.is_empty() {
1378 // user did not write `-v` nor `-Z unstable-options`, so do not
1379 // include that extra information.
1380 usage(false, false);
1384 // Parse with *all* options defined in the compiler, we don't worry about
1385 // option stability here we just want to parse as much as possible.
1386 let mut options = getopts::Options::new();
1387 for option in config::rustc_optgroups() {
1388 (option.apply)(&mut options);
1390 let matches = options.parse(args).unwrap_or_else(|f|
1391 early_error(ErrorOutputType::default(), &f.to_string()));
1393 // For all options we just parsed, we check a few aspects:
1395 // * If the option is stable, we're all good
1396 // * If the option wasn't passed, we're all good
1397 // * If `-Z unstable-options` wasn't passed (and we're not a -Z option
1398 // ourselves), then we require the `-Z unstable-options` flag to unlock
1399 // this option that was passed.
1400 // * If we're a nightly compiler, then unstable options are now unlocked, so
1401 // we're good to go.
1402 // * Otherwise, if we're a truly unstable option then we generate an error
1403 // (unstable option being used on stable)
1404 // * If we're a historically stable-but-should-be-unstable option then we
1405 // emit a warning that we're going to turn this into an error soon.
1406 nightly_options::check_nightly_options(&matches, &config::rustc_optgroups());
1408 if matches.opt_present("h") || matches.opt_present("help") {
1409 // Only show unstable options in --help if we *really* accept unstable
1410 // options, which catches the case where we got `-Z unstable-options` on
1411 // the stable channel of Rust which was accidentally allowed
1413 usage(matches.opt_present("verbose"),
1414 nightly_options::is_unstable_enabled(&matches));
1418 // Handle the special case of -Wall.
1419 let wall = matches.opt_strs("W");
1420 if wall.iter().any(|x| *x == "all") {
1425 // Don't handle -W help here, because we might first load plugins.
1426 let r = matches.opt_strs("Z");
1427 if r.iter().any(|x| *x == "help") {
1428 describe_debug_flags();
1432 let cg_flags = matches.opt_strs("C");
1434 if cg_flags.iter().any(|x| *x == "help") {
1435 describe_codegen_flags();
1439 if cg_flags.iter().any(|x| *x == "no-stack-check") {
1440 early_warn(ErrorOutputType::default(),
1441 "the --no-stack-check flag is deprecated and does nothing");
1444 if cg_flags.iter().any(|x| *x == "passes=list") {
1445 get_codegen_sysroot("llvm")().print_passes();
1449 if matches.opt_present("version") {
1450 version("rustc", &matches);
1457 fn parse_crate_attrs<'a>(sess: &'a Session, input: &Input) -> PResult<'a, Vec<ast::Attribute>> {
1459 Input::File(ref ifile) => {
1460 parse::parse_crate_attrs_from_file(ifile, &sess.parse_sess)
1462 Input::Str { ref name, ref input } => {
1463 parse::parse_crate_attrs_from_source_str(name.clone(),
1470 // Temporarily have stack size set to 32MB to deal with various crates with long method
1471 // chains or deep syntax trees.
1472 // FIXME(oli-obk): get https://github.com/rust-lang/rust/pull/55617 the finish line
1473 const STACK_SIZE: usize = 32 * 1024 * 1024; // 32MB
1475 /// Runs `f` in a suitable thread for running `rustc`; returns a `Result` with either the return
1476 /// value of `f` or -- if a panic occurs -- the panic value.
1478 /// This version applies the given name to the thread. This is used by rustdoc to ensure consistent
1479 /// doctest output across platforms and executions.
1480 pub fn in_named_rustc_thread<F, R>(name: String, f: F) -> Result<R, Box<dyn Any + Send>>
1481 where F: FnOnce() -> R + Send + 'static,
1484 #[cfg(all(unix, not(target_os = "haiku")))]
1485 let spawn_thread = unsafe {
1486 // Fetch the current resource limits
1487 let mut rlim = libc::rlimit {
1491 if libc::getrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1492 let err = io::Error::last_os_error();
1493 error!("in_rustc_thread: error calling getrlimit: {}", err);
1495 } else if rlim.rlim_max < STACK_SIZE as libc::rlim_t {
1497 } else if rlim.rlim_cur < STACK_SIZE as libc::rlim_t {
1498 std::rt::deinit_stack_guard();
1499 rlim.rlim_cur = STACK_SIZE as libc::rlim_t;
1500 if libc::setrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1501 let err = io::Error::last_os_error();
1502 error!("in_rustc_thread: error calling setrlimit: {}", err);
1503 std::rt::update_stack_guard();
1506 std::rt::update_stack_guard();
1514 // We set the stack size at link time. See src/rustc/rustc.rs.
1516 let spawn_thread = false;
1518 #[cfg(target_os = "haiku")]
1519 let spawn_thread = unsafe {
1520 // Haiku does not have setrlimit implemented for the stack size.
1521 // By default it does have the 16 MB stack limit, but we check this in
1522 // case the minimum STACK_SIZE changes or Haiku's defaults change.
1523 let mut rlim = libc::rlimit {
1527 if libc::getrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1528 let err = io::Error::last_os_error();
1529 error!("in_rustc_thread: error calling getrlimit: {}", err);
1531 } else if rlim.rlim_cur >= STACK_SIZE {
1538 #[cfg(not(any(windows, unix)))]
1539 let spawn_thread = true;
1541 // The or condition is added from backward compatibility.
1542 if spawn_thread || env::var_os("RUST_MIN_STACK").is_some() {
1543 let mut cfg = thread::Builder::new().name(name);
1545 // FIXME: Hacks on hacks. If the env is trying to override the stack size
1546 // then *don't* set it explicitly.
1547 if env::var_os("RUST_MIN_STACK").is_none() {
1548 cfg = cfg.stack_size(STACK_SIZE);
1551 let thread = cfg.spawn(f);
1552 thread.unwrap().join()
1554 let f = panic::AssertUnwindSafe(f);
1555 panic::catch_unwind(f)
1559 /// Runs `f` in a suitable thread for running `rustc`; returns a
1560 /// `Result` with either the return value of `f` or -- if a panic
1561 /// occurs -- the panic value.
1562 pub fn in_rustc_thread<F, R>(f: F) -> Result<R, Box<dyn Any + Send>>
1563 where F: FnOnce() -> R + Send + 'static,
1566 in_named_rustc_thread("rustc".to_string(), f)
1569 /// Get a list of extra command-line flags provided by the user, as strings.
1571 /// This function is used during ICEs to show more information useful for
1572 /// debugging, since some ICEs only happens with non-default compiler flags
1573 /// (and the users don't always report them).
1574 fn extra_compiler_flags() -> Option<(Vec<String>, bool)> {
1575 let args = env::args_os().map(|arg| arg.to_string_lossy().to_string()).collect::<Vec<_>>();
1577 // Avoid printing help because of empty args. This can suggest the compiler
1578 // itself is not the program root (consider RLS).
1583 let matches = if let Some(matches) = handle_options(&args) {
1589 let mut result = Vec::new();
1590 let mut excluded_cargo_defaults = false;
1591 for flag in ICE_REPORT_COMPILER_FLAGS {
1592 let prefix = if flag.len() == 1 { "-" } else { "--" };
1594 for content in &matches.opt_strs(flag) {
1595 // Split always returns the first element
1596 let name = if let Some(first) = content.split('=').next() {
1602 let content = if ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE.contains(&name) {
1608 if !ICE_REPORT_COMPILER_FLAGS_EXCLUDE.contains(&name) {
1609 result.push(format!("{}{} {}", prefix, flag, content));
1611 excluded_cargo_defaults = true;
1616 if !result.is_empty() {
1617 Some((result, excluded_cargo_defaults))
1624 pub struct CompilationFailure;
1626 impl Error for CompilationFailure {}
1628 impl Display for CompilationFailure {
1629 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1630 write!(f, "compilation had errors")
1634 /// Run a procedure which will detect panics in the compiler and print nicer
1635 /// error messages rather than just failing the test.
1637 /// The diagnostic emitter yielded to the procedure should be used for reporting
1638 /// errors of the compiler.
1639 pub fn monitor<F: FnOnce() + Send + 'static>(f: F) -> Result<(), CompilationFailure> {
1640 in_rustc_thread(move || {
1642 }).map_err(|value| {
1643 if value.is::<errors::FatalErrorMarker>() {
1646 // Thread panicked without emitting a fatal diagnostic
1650 Box::new(errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
1654 let handler = errors::Handler::with_emitter(true, false, emitter);
1656 // a .span_bug or .bug call has already printed what
1657 // it wants to print.
1658 if !value.is::<errors::ExplicitBug>() {
1659 handler.emit(&MultiSpan::new(),
1661 errors::Level::Bug);
1664 let mut xs: Vec<Cow<'static, str>> = vec![
1665 "the compiler unexpectedly panicked. this is a bug.".into(),
1666 format!("we would appreciate a bug report: {}", BUG_REPORT_URL).into(),
1667 format!("rustc {} running on {}",
1668 option_env!("CFG_VERSION").unwrap_or("unknown_version"),
1669 config::host_triple()).into(),
1672 if let Some((flags, excluded_cargo_defaults)) = extra_compiler_flags() {
1673 xs.push(format!("compiler flags: {}", flags.join(" ")).into());
1675 if excluded_cargo_defaults {
1676 xs.push("some of the compiler flags provided by cargo are hidden".into());
1681 handler.emit(&MultiSpan::new(),
1683 errors::Level::Note);
1686 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
1691 pub fn diagnostics_registry() -> errors::registry::Registry {
1692 use errors::registry::Registry;
1694 let mut all_errors = Vec::new();
1695 all_errors.extend_from_slice(&rustc::DIAGNOSTICS);
1696 all_errors.extend_from_slice(&rustc_typeck::DIAGNOSTICS);
1697 all_errors.extend_from_slice(&rustc_resolve::DIAGNOSTICS);
1698 all_errors.extend_from_slice(&rustc_privacy::DIAGNOSTICS);
1699 // FIXME: need to figure out a way to get these back in here
1700 // all_errors.extend_from_slice(get_codegen_backend(sess).diagnostics());
1701 all_errors.extend_from_slice(&rustc_metadata::DIAGNOSTICS);
1702 all_errors.extend_from_slice(&rustc_passes::DIAGNOSTICS);
1703 all_errors.extend_from_slice(&rustc_plugin::DIAGNOSTICS);
1704 all_errors.extend_from_slice(&rustc_mir::DIAGNOSTICS);
1705 all_errors.extend_from_slice(&syntax::DIAGNOSTICS);
1707 Registry::new(&all_errors)
1710 /// This allows tools to enable rust logging without having to magically match rustc's
1711 /// log crate version
1712 pub fn init_rustc_env_logger() {
1717 init_rustc_env_logger();
1718 let result = run(|| {
1719 let args = env::args_os().enumerate()
1720 .map(|(i, arg)| arg.into_string().unwrap_or_else(|arg| {
1721 early_error(ErrorOutputType::default(),
1722 &format!("Argument {} is not valid Unicode: {:?}", i, arg))
1724 .collect::<Vec<_>>();
1726 Box::new(RustcDefaultCalls),
1730 process::exit(result as i32);