5 //! This API is completely unstable and subject to change.
7 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
9 #![feature(box_syntax)]
10 #![cfg_attr(unix, feature(libc))]
12 #![feature(rustc_diagnostic_macros)]
13 #![feature(set_stdio)]
15 #![feature(integer_atomics)]
17 #![recursion_limit="256"]
19 pub extern crate getopts;
25 pub extern crate rustc_plugin_impl as plugin;
27 use pretty::{PpMode, UserIdentifiedItem};
29 //use rustc_resolve as resolve;
30 use rustc_save_analysis as save;
31 use rustc_save_analysis::DumpHandler;
32 use rustc::session::{config, Session, DiagnosticOutput};
33 use rustc::session::config::{Input, PrintRequest, ErrorOutputType, OutputType};
34 use rustc::session::config::nightly_options;
35 use rustc::session::{early_error, early_warn};
36 use rustc::lint::Lint;
38 use rustc::hir::def_id::LOCAL_CRATE;
39 use rustc::util::common::{ErrorReported, install_panic_hook, print_time_passes_entry};
40 use rustc::util::common::{set_time_depth, time};
41 use rustc_metadata::locator;
42 use rustc_metadata::cstore::CStore;
43 use rustc_codegen_utils::codegen_backend::CodegenBackend;
44 use rustc_interface::interface;
45 use rustc_interface::util::get_codegen_sysroot;
46 use rustc_data_structures::sync::SeqCst;
48 use rustc_serialize::json::ToJson;
52 use std::default::Default;
54 use std::ffi::OsString;
55 use std::io::{self, Read, Write};
57 use std::panic::{self, catch_unwind};
58 use std::path::PathBuf;
59 use std::process::{self, Command, Stdio};
61 use std::time::Instant;
64 use syntax::source_map::FileLoader;
65 use syntax::feature_gate::{GatedCfg, UnstableFeatures};
66 use syntax::parse::{self, PResult};
67 use syntax::symbol::sym;
68 use syntax_pos::{DUMMY_SP, MultiSpan, FileName};
72 /// Exit status code used for successful compilation and help output.
73 pub const EXIT_SUCCESS: i32 = 0;
75 /// Exit status code used for compilation failures and invalid flags.
76 pub const EXIT_FAILURE: i32 = 1;
78 const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.\
81 const ICE_REPORT_COMPILER_FLAGS: &[&str] = &["Z", "C", "crate-type"];
83 const ICE_REPORT_COMPILER_FLAGS_EXCLUDE: &[&str] = &["metadata", "extra-filename"];
85 const ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE: &[&str] = &["incremental"];
87 pub fn source_name(input: &Input) -> FileName {
89 Input::File(ref ifile) => ifile.clone().into(),
90 Input::Str { ref name, .. } => name.clone(),
94 pub fn abort_on_err<T>(result: Result<T, ErrorReported>, sess: &Session) -> T {
97 sess.abort_if_errors();
98 panic!("error reported but abort_if_errors didn't abort???");
104 pub trait Callbacks {
105 /// Called before creating the compiler instance
106 fn config(&mut self, _config: &mut interface::Config) {}
107 /// Called after parsing. Return value instructs the compiler whether to
108 /// continue the compilation afterwards (defaults to `Compilation::Continue`)
109 fn after_parsing(&mut self, _compiler: &interface::Compiler) -> Compilation {
110 Compilation::Continue
112 /// Called after expansion. Return value instructs the compiler whether to
113 /// continue the compilation afterwards (defaults to `Compilation::Continue`)
114 fn after_expansion(&mut self, _compiler: &interface::Compiler) -> Compilation {
115 Compilation::Continue
117 /// Called after analysis. Return value instructs the compiler whether to
118 /// continue the compilation afterwards (defaults to `Compilation::Continue`)
119 fn after_analysis(&mut self, _compiler: &interface::Compiler) -> Compilation {
120 Compilation::Continue
124 pub struct DefaultCallbacks;
126 impl Callbacks for DefaultCallbacks {}
129 pub struct TimePassesCallbacks {
133 impl Callbacks for TimePassesCallbacks {
134 fn config(&mut self, config: &mut interface::Config) {
136 config.opts.debugging_opts.time_passes || config.opts.debugging_opts.time;
140 // Parse args and run the compiler. This is the primary entry point for rustc.
141 // See comments on CompilerCalls below for details about the callbacks argument.
142 // The FileLoader provides a way to load files from sources other than the file system.
145 callbacks: &mut (dyn Callbacks + Send),
146 file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
147 emitter: Option<Box<dyn Write + Send>>
148 ) -> interface::Result<()> {
149 let diagnostic_output = emitter.map(|emitter| DiagnosticOutput::Raw(emitter))
150 .unwrap_or(DiagnosticOutput::Default);
151 let matches = match handle_options(args) {
152 Some(matches) => matches,
153 None => return Ok(()),
156 install_panic_hook();
158 let (sopts, cfg) = config::build_session_options_and_crate_config(&matches);
160 let mut dummy_config = |sopts, cfg, diagnostic_output| {
161 let mut config = interface::Config {
164 input: Input::File(PathBuf::new()),
172 lint_caps: Default::default(),
174 callbacks.config(&mut config);
178 if let Some(ref code) = matches.opt_str("explain") {
179 handle_explain(code, sopts.error_format);
183 let (odir, ofile) = make_output(&matches);
184 let (input, input_file_path, input_err) = match make_input(&matches.free) {
187 match matches.free.len() {
189 let config = dummy_config(sopts, cfg, diagnostic_output);
190 interface::run_compiler(config, |compiler| {
191 let sopts = &compiler.session().opts;
192 if sopts.describe_lints {
195 &*compiler.session().lint_store.borrow(),
200 let should_stop = RustcDefaultCalls::print_crate_info(
201 &***compiler.codegen_backend(),
208 if should_stop == Compilation::Stop {
211 early_error(sopts.error_format, "no input filename given")
215 1 => panic!("make_input should have provided valid inputs"),
216 _ => early_error(sopts.error_format, &format!(
217 "multiple input filenames provided (first two filenames are `{}` and `{}`)",
225 if let Some(err) = input_err {
226 // Immediately stop compilation if there was an issue reading
227 // the input (for example if the input stream is not UTF-8).
228 interface::run_compiler(dummy_config(sopts, cfg, diagnostic_output), |compiler| {
229 compiler.session().err(&err.to_string());
231 return Err(ErrorReported);
234 let mut config = interface::Config {
238 input_path: input_file_path,
245 lint_caps: Default::default(),
248 callbacks.config(&mut config);
250 interface::run_compiler(config, |compiler| {
251 let sess = compiler.session();
252 let should_stop = RustcDefaultCalls::print_crate_info(
253 &***compiler.codegen_backend(),
255 Some(compiler.input()),
256 compiler.output_dir(),
257 compiler.output_file(),
258 ).and_then(|| RustcDefaultCalls::list_metadata(
265 if should_stop == Compilation::Stop {
266 return sess.compile_status();
269 let pretty_info = parse_pretty(sess, &matches);
273 if let Some((ppm, opt_uii)) = pretty_info {
274 if ppm.needs_ast_map(&opt_uii) {
275 pretty::visit_crate(sess, &mut compiler.parse()?.peek_mut(), ppm);
276 compiler.global_ctxt()?.peek_mut().enter(|tcx| {
277 let expanded_crate = compiler.expansion()?.take().0;
278 pretty::print_after_hir_lowering(
284 compiler.output_file().as_ref().map(|p| &**p),
288 return sess.compile_status();
290 let mut krate = compiler.parse()?.take();
291 pretty::visit_crate(sess, &mut krate, ppm);
292 pretty::print_after_parsing(
297 compiler.output_file().as_ref().map(|p| &**p),
299 return sess.compile_status();
303 if callbacks.after_parsing(compiler) == Compilation::Stop {
304 return sess.compile_status();
307 if sess.opts.debugging_opts.parse_only ||
308 sess.opts.debugging_opts.show_span.is_some() ||
309 sess.opts.debugging_opts.ast_json_noexpand {
310 return sess.compile_status();
313 compiler.register_plugins()?;
315 // Lint plugins are registered; now we can process command line flags.
316 if sess.opts.describe_lints {
317 describe_lints(&sess, &sess.lint_store.borrow(), true);
318 return sess.compile_status();
321 compiler.expansion()?;
322 if callbacks.after_expansion(compiler) == Compilation::Stop {
323 return sess.compile_status();
326 compiler.prepare_outputs()?;
328 if sess.opts.output_types.contains_key(&OutputType::DepInfo)
329 && sess.opts.output_types.len() == 1
331 return sess.compile_status();
334 compiler.global_ctxt()?;
336 if sess.opts.debugging_opts.no_analysis ||
337 sess.opts.debugging_opts.ast_json {
338 return sess.compile_status();
341 if sess.opts.debugging_opts.save_analysis {
342 let expanded_crate = &compiler.expansion()?.peek().0;
343 let crate_name = compiler.crate_name()?.peek().clone();
344 compiler.global_ctxt()?.peek_mut().enter(|tcx| {
345 let result = tcx.analysis(LOCAL_CRATE);
347 time(sess, "save analysis", || {
354 DumpHandler::new(compiler.output_dir().as_ref().map(|p| &**p), &crate_name)
359 // AST will be dropped *after* the `after_analysis` callback
360 // (needed by the RLS)
363 // Drop AST after creating GlobalCtxt to free memory
364 mem::drop(compiler.expansion()?.take());
367 compiler.global_ctxt()?.peek_mut().enter(|tcx| tcx.analysis(LOCAL_CRATE))?;
369 if callbacks.after_analysis(compiler) == Compilation::Stop {
370 return sess.compile_status();
373 if sess.opts.debugging_opts.save_analysis {
374 mem::drop(compiler.expansion()?.take());
377 compiler.ongoing_codegen()?;
379 // Drop GlobalCtxt after starting codegen to free memory
380 mem::drop(compiler.global_ctxt()?.take());
382 if sess.opts.debugging_opts.print_type_sizes {
383 sess.code_stats.borrow().print_type_sizes();
388 if sess.opts.debugging_opts.perf_stats {
389 sess.print_perf_stats();
392 if sess.print_fuel_crate.is_some() {
393 eprintln!("Fuel used by {}: {}",
394 sess.print_fuel_crate.as_ref().unwrap(),
395 sess.print_fuel.load(SeqCst));
403 pub fn set_sigpipe_handler() {
405 // Set the SIGPIPE signal handler, so that an EPIPE
406 // will cause rustc to terminate, as expected.
407 assert_ne!(libc::signal(libc::SIGPIPE, libc::SIG_DFL), libc::SIG_ERR);
412 pub fn set_sigpipe_handler() {}
414 // Extract output directory and file from matches.
415 fn make_output(matches: &getopts::Matches) -> (Option<PathBuf>, Option<PathBuf>) {
416 let odir = matches.opt_str("out-dir").map(|o| PathBuf::from(&o));
417 let ofile = matches.opt_str("o").map(|o| PathBuf::from(&o));
421 // Extract input (string or file and optional path) from matches.
422 fn make_input(free_matches: &[String]) -> Option<(Input, Option<PathBuf>, Option<io::Error>)> {
423 if free_matches.len() == 1 {
424 let ifile = &free_matches[0];
426 let mut src = String::new();
427 let err = if io::stdin().read_to_string(&mut src).is_err() {
428 Some(io::Error::new(io::ErrorKind::InvalidData,
429 "couldn't read from stdin, as it did not contain valid UTF-8"))
433 Some((Input::Str { name: FileName::anon_source_code(&src), input: src },
436 Some((Input::File(PathBuf::from(ifile)),
437 Some(PathBuf::from(ifile)), None))
444 fn parse_pretty(sess: &Session,
445 matches: &getopts::Matches)
446 -> Option<(PpMode, Option<UserIdentifiedItem>)> {
447 let pretty = if sess.opts.debugging_opts.unstable_options {
448 matches.opt_default("pretty", "normal").map(|a| {
449 // stable pretty-print variants only
450 pretty::parse_pretty(sess, &a, false)
456 if pretty.is_none() {
457 sess.opts.debugging_opts.unpretty.as_ref().map(|a| {
458 // extended with unstable pretty-print variants
459 pretty::parse_pretty(sess, &a, true)
466 // Whether to stop or continue compilation.
467 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
468 pub enum Compilation {
474 pub fn and_then<F: FnOnce() -> Compilation>(self, next: F) -> Compilation {
476 Compilation::Stop => Compilation::Stop,
477 Compilation::Continue => next(),
482 /// CompilerCalls instance for a regular rustc build.
483 #[derive(Copy, Clone)]
484 pub struct RustcDefaultCalls;
486 // FIXME remove these and use winapi 0.3 instead
487 // Duplicates: bootstrap/compile.rs, librustc_errors/emitter.rs
489 fn stdout_isatty() -> bool {
490 unsafe { libc::isatty(libc::STDOUT_FILENO) != 0 }
494 fn stdout_isatty() -> bool {
497 type HANDLE = *mut u8;
498 type LPDWORD = *mut u32;
499 const STD_OUTPUT_HANDLE: DWORD = -11i32 as DWORD;
501 fn GetStdHandle(which: DWORD) -> HANDLE;
502 fn GetConsoleMode(hConsoleHandle: HANDLE, lpMode: LPDWORD) -> BOOL;
505 let handle = GetStdHandle(STD_OUTPUT_HANDLE);
507 GetConsoleMode(handle, &mut out) != 0
511 fn handle_explain(code: &str,
512 output: ErrorOutputType) {
513 let descriptions = rustc_interface::util::diagnostics_registry();
514 let normalised = if code.starts_with("E") {
517 format!("E{0:0>4}", code)
519 match descriptions.find_description(&normalised) {
520 Some(ref description) => {
521 let mut is_in_code_block = false;
522 let mut text = String::new();
524 // Slice off the leading newline and print.
525 for line in description[1..].lines() {
526 let indent_level = line.find(|c: char| !c.is_whitespace())
527 .unwrap_or_else(|| line.len());
528 let dedented_line = &line[indent_level..];
529 if dedented_line.starts_with("```") {
530 is_in_code_block = !is_in_code_block;
531 text.push_str(&line[..(indent_level+3)]);
532 } else if is_in_code_block && dedented_line.starts_with("# ") {
541 show_content_with_pager(&text);
547 early_error(output, &format!("no extended information for {}", code));
552 fn show_content_with_pager(content: &String) {
553 let pager_name = env::var_os("PAGER").unwrap_or_else(|| if cfg!(windows) {
554 OsString::from("more.com")
556 OsString::from("less")
559 let mut fallback_to_println = false;
561 match Command::new(pager_name).stdin(Stdio::piped()).spawn() {
563 if let Some(pipe) = pager.stdin.as_mut() {
564 if pipe.write_all(content.as_bytes()).is_err() {
565 fallback_to_println = true;
569 if pager.wait().is_err() {
570 fallback_to_println = true;
574 fallback_to_println = true;
578 // If pager fails for whatever reason, we should still print the content
579 // to standard output
580 if fallback_to_println {
581 print!("{}", content);
585 impl RustcDefaultCalls {
586 pub fn list_metadata(sess: &Session,
588 matches: &getopts::Matches,
591 let r = matches.opt_strs("Z");
592 if r.iter().any(|s| *s == "ls") {
594 &Input::File(ref ifile) => {
595 let path = &(*ifile);
596 let mut v = Vec::new();
597 locator::list_file_metadata(&sess.target.target,
599 &*cstore.metadata_loader,
602 println!("{}", String::from_utf8(v).unwrap());
604 &Input::Str { .. } => {
605 early_error(ErrorOutputType::default(), "cannot list metadata for stdin");
608 return Compilation::Stop;
611 Compilation::Continue
615 fn print_crate_info(codegen_backend: &dyn CodegenBackend,
617 input: Option<&Input>,
618 odir: &Option<PathBuf>,
619 ofile: &Option<PathBuf>)
621 use rustc::session::config::PrintRequest::*;
622 // PrintRequest::NativeStaticLibs is special - printed during linking
623 // (empty iterator returns true)
624 if sess.opts.prints.iter().all(|&p| p == PrintRequest::NativeStaticLibs) {
625 return Compilation::Continue;
628 let attrs = match input {
631 let result = parse_crate_attrs(sess, input);
633 Ok(attrs) => Some(attrs),
634 Err(mut parse_error) => {
636 return Compilation::Stop;
641 for req in &sess.opts.prints {
644 let mut targets = rustc_target::spec::get_targets().collect::<Vec<String>>();
646 println!("{}", targets.join("\n"));
648 Sysroot => println!("{}", sess.sysroot.display()),
649 TargetSpec => println!("{}", sess.target.target.to_json().pretty()),
650 FileNames | CrateName => {
651 let input = input.unwrap_or_else(||
652 early_error(ErrorOutputType::default(), "no input file provided"));
653 let attrs = attrs.as_ref().unwrap();
654 let t_outputs = rustc_interface::util::build_output_filenames(
661 let id = rustc_codegen_utils::link::find_crate_name(Some(sess), attrs, input);
662 if *req == PrintRequest::CrateName {
666 let crate_types = rustc_interface::util::collect_crate_types(sess, attrs);
667 for &style in &crate_types {
668 let fname = rustc_codegen_utils::link::filename_for_input(
674 println!("{}", fname.file_name().unwrap().to_string_lossy());
678 let allow_unstable_cfg = UnstableFeatures::from_environment()
681 let mut cfgs = sess.parse_sess.config.iter().filter_map(|&(name, ref value)| {
682 let gated_cfg = GatedCfg::gate(&ast::MetaItem {
683 path: ast::Path::from_ident(ast::Ident::with_dummy_span(name)),
684 node: ast::MetaItemKind::Word,
688 // Note that crt-static is a specially recognized cfg
689 // directive that's printed out here as part of
690 // rust-lang/rust#37406, but in general the
691 // `target_feature` cfg is gated under
692 // rust-lang/rust#29717. For now this is just
693 // specifically allowing the crt-static cfg and that's
694 // it, this is intended to get into Cargo and then go
695 // through to build scripts.
696 let value = value.as_ref().map(|s| s.as_str());
697 let value = value.as_ref().map(|s| s.as_ref());
698 if name != sym::target_feature || value != Some("crt-static") {
699 if !allow_unstable_cfg && gated_cfg.is_some() {
704 if let Some(value) = value {
705 Some(format!("{}=\"{}\"", name, value))
707 Some(name.to_string())
709 }).collect::<Vec<String>>();
716 RelocationModels | CodeModels | TlsModels | TargetCPUs | TargetFeatures => {
717 codegen_backend.print(*req, sess);
719 // Any output here interferes with Cargo's parsing of other printed output
720 PrintRequest::NativeStaticLibs => {}
723 return Compilation::Stop;
727 /// Returns a version string such as "0.12.0-dev".
728 fn release_str() -> Option<&'static str> {
729 option_env!("CFG_RELEASE")
732 /// Returns the full SHA1 hash of HEAD of the Git repo from which rustc was built.
733 fn commit_hash_str() -> Option<&'static str> {
734 option_env!("CFG_VER_HASH")
737 /// Returns the "commit date" of HEAD of the Git repo from which rustc was built as a static string.
738 fn commit_date_str() -> Option<&'static str> {
739 option_env!("CFG_VER_DATE")
742 /// Prints version information
743 pub fn version(binary: &str, matches: &getopts::Matches) {
744 let verbose = matches.opt_present("verbose");
746 println!("{} {}", binary, option_env!("CFG_VERSION").unwrap_or("unknown version"));
749 fn unw(x: Option<&str>) -> &str {
750 x.unwrap_or("unknown")
752 println!("binary: {}", binary);
753 println!("commit-hash: {}", unw(commit_hash_str()));
754 println!("commit-date: {}", unw(commit_date_str()));
755 println!("host: {}", config::host_triple());
756 println!("release: {}", unw(release_str()));
757 get_codegen_sysroot("llvm")().print_version();
761 fn usage(verbose: bool, include_unstable_options: bool) {
762 let groups = if verbose {
763 config::rustc_optgroups()
765 config::rustc_short_optgroups()
767 let mut options = getopts::Options::new();
768 for option in groups.iter().filter(|x| include_unstable_options || x.is_stable()) {
769 (option.apply)(&mut options);
771 let message = "Usage: rustc [OPTIONS] INPUT";
772 let nightly_help = if nightly_options::is_nightly_build() {
773 "\n -Z help Print unstable compiler options"
777 let verbose_help = if verbose {
780 "\n --help -v Print the full set of options rustc accepts"
782 println!("{}\nAdditional help:
783 -C help Print codegen options
785 Print 'lint' options and default settings{}{}\n",
786 options.usage(message),
791 fn print_wall_help() {
793 The flag `-Wall` does not exist in `rustc`. Most useful lints are enabled by
794 default. Use `rustc -W help` to see all available lints. It's more common to put
795 warning settings in the crate root using `#![warn(LINT_NAME)]` instead of using
796 the command line flag directly.
800 fn describe_lints(sess: &Session, lint_store: &lint::LintStore, loaded_plugins: bool) {
802 Available lint options:
803 -W <foo> Warn about <foo>
807 -F <foo> Forbid <foo> \
808 (deny <foo> and all attempts to override)
812 fn sort_lints(sess: &Session, lints: Vec<(&'static Lint, bool)>) -> Vec<&'static Lint> {
813 let mut lints: Vec<_> = lints.into_iter().map(|(x, _)| x).collect();
814 // The sort doesn't case-fold but it's doubtful we care.
815 lints.sort_by_cached_key(|x: &&Lint| (x.default_level(sess), x.name));
819 fn sort_lint_groups(lints: Vec<(&'static str, Vec<lint::LintId>, bool)>)
820 -> Vec<(&'static str, Vec<lint::LintId>)> {
821 let mut lints: Vec<_> = lints.into_iter().map(|(x, y, _)| (x, y)).collect();
822 lints.sort_by_key(|l| l.0);
826 let (plugin, builtin): (Vec<_>, _) = lint_store.get_lints()
829 .partition(|&(_, p)| p);
830 let plugin = sort_lints(sess, plugin);
831 let builtin = sort_lints(sess, builtin);
833 let (plugin_groups, builtin_groups): (Vec<_>, _) = lint_store.get_lint_groups()
836 .partition(|&(.., p)| p);
837 let plugin_groups = sort_lint_groups(plugin_groups);
838 let builtin_groups = sort_lint_groups(builtin_groups);
840 let max_name_len = plugin.iter()
842 .map(|&s| s.name.chars().count())
845 let padded = |x: &str| {
846 let mut s = " ".repeat(max_name_len - x.chars().count());
851 println!("Lint checks provided by rustc:\n");
852 println!(" {} {:7.7} {}", padded("name"), "default", "meaning");
853 println!(" {} {:7.7} {}", padded("----"), "-------", "-------");
855 let print_lints = |lints: Vec<&Lint>| {
857 let name = lint.name_lower().replace("_", "-");
858 println!(" {} {:7.7} {}",
860 lint.default_level.as_str(),
866 print_lints(builtin);
868 let max_name_len = max("warnings".len(),
870 .chain(&builtin_groups)
871 .map(|&(s, _)| s.chars().count())
875 let padded = |x: &str| {
876 let mut s = " ".repeat(max_name_len - x.chars().count());
881 println!("Lint groups provided by rustc:\n");
882 println!(" {} {}", padded("name"), "sub-lints");
883 println!(" {} {}", padded("----"), "---------");
884 println!(" {} {}", padded("warnings"), "all lints that are set to issue warnings");
886 let print_lint_groups = |lints: Vec<(&'static str, Vec<lint::LintId>)>| {
887 for (name, to) in lints {
888 let name = name.to_lowercase().replace("_", "-");
889 let desc = to.into_iter()
890 .map(|x| x.to_string().replace("_", "-"))
891 .collect::<Vec<String>>()
893 println!(" {} {}", padded(&name), desc);
898 print_lint_groups(builtin_groups);
900 match (loaded_plugins, plugin.len(), plugin_groups.len()) {
901 (false, 0, _) | (false, _, 0) => {
902 println!("Compiler plugins can provide additional lints and lint groups. To see a \
903 listing of these, re-run `rustc -W help` with a crate filename.");
905 (false, ..) => panic!("didn't load lint plugins but got them anyway!"),
906 (true, 0, 0) => println!("This crate does not load any lint plugins or lint groups."),
909 println!("Lint checks provided by plugins loaded by this crate:\n");
913 println!("Lint groups provided by plugins loaded by this crate:\n");
914 print_lint_groups(plugin_groups);
920 fn describe_debug_flags() {
921 println!("\nAvailable options:\n");
922 print_flag_list("-Z", config::DB_OPTIONS);
925 fn describe_codegen_flags() {
926 println!("\nAvailable codegen options:\n");
927 print_flag_list("-C", config::CG_OPTIONS);
930 fn print_flag_list<T>(cmdline_opt: &str,
931 flag_list: &[(&'static str, T, Option<&'static str>, &'static str)]) {
932 let max_len = flag_list.iter()
933 .map(|&(name, _, opt_type_desc, _)| {
934 let extra_len = match opt_type_desc {
938 name.chars().count() + extra_len
943 for &(name, _, opt_type_desc, desc) in flag_list {
944 let (width, extra) = match opt_type_desc {
945 Some(..) => (max_len - 4, "=val"),
946 None => (max_len, ""),
948 println!(" {} {:>width$}{} -- {}",
950 name.replace("_", "-"),
957 /// Process command line options. Emits messages as appropriate. If compilation
958 /// should continue, returns a getopts::Matches object parsed from args,
959 /// otherwise returns `None`.
961 /// The compiler's handling of options is a little complicated as it ties into
962 /// our stability story. The current intention of each compiler option is to
963 /// have one of two modes:
965 /// 1. An option is stable and can be used everywhere.
966 /// 2. An option is unstable, and can only be used on nightly.
968 /// Like unstable library and language features, however, unstable options have
969 /// always required a form of "opt in" to indicate that you're using them. This
970 /// provides the easy ability to scan a code base to check to see if anything
971 /// unstable is being used. Currently, this "opt in" is the `-Z` "zed" flag.
973 /// All options behind `-Z` are considered unstable by default. Other top-level
974 /// options can also be considered unstable, and they were unlocked through the
975 /// `-Z unstable-options` flag. Note that `-Z` remains to be the root of
976 /// instability in both cases, though.
978 /// So with all that in mind, the comments below have some more detail about the
979 /// contortions done here to get things to work out correctly.
980 pub fn handle_options(args: &[String]) -> Option<getopts::Matches> {
981 // Throw away the first argument, the name of the binary
982 let args = &args[1..];
985 // user did not write `-v` nor `-Z unstable-options`, so do not
986 // include that extra information.
991 // Parse with *all* options defined in the compiler, we don't worry about
992 // option stability here we just want to parse as much as possible.
993 let mut options = getopts::Options::new();
994 for option in config::rustc_optgroups() {
995 (option.apply)(&mut options);
997 let matches = options.parse(args).unwrap_or_else(|f|
998 early_error(ErrorOutputType::default(), &f.to_string()));
1000 // For all options we just parsed, we check a few aspects:
1002 // * If the option is stable, we're all good
1003 // * If the option wasn't passed, we're all good
1004 // * If `-Z unstable-options` wasn't passed (and we're not a -Z option
1005 // ourselves), then we require the `-Z unstable-options` flag to unlock
1006 // this option that was passed.
1007 // * If we're a nightly compiler, then unstable options are now unlocked, so
1008 // we're good to go.
1009 // * Otherwise, if we're an unstable option then we generate an error
1010 // (unstable option being used on stable)
1011 nightly_options::check_nightly_options(&matches, &config::rustc_optgroups());
1013 if matches.opt_present("h") || matches.opt_present("help") {
1014 // Only show unstable options in --help if we accept unstable options.
1015 usage(matches.opt_present("verbose"), nightly_options::is_unstable_enabled(&matches));
1019 // Handle the special case of -Wall.
1020 let wall = matches.opt_strs("W");
1021 if wall.iter().any(|x| *x == "all") {
1026 // Don't handle -W help here, because we might first load plugins.
1027 let r = matches.opt_strs("Z");
1028 if r.iter().any(|x| *x == "help") {
1029 describe_debug_flags();
1033 let cg_flags = matches.opt_strs("C");
1035 if cg_flags.iter().any(|x| *x == "help") {
1036 describe_codegen_flags();
1040 if cg_flags.iter().any(|x| *x == "no-stack-check") {
1041 early_warn(ErrorOutputType::default(),
1042 "the --no-stack-check flag is deprecated and does nothing");
1045 if cg_flags.iter().any(|x| *x == "passes=list") {
1046 get_codegen_sysroot("llvm")().print_passes();
1050 if matches.opt_present("version") {
1051 version("rustc", &matches);
1058 fn parse_crate_attrs<'a>(sess: &'a Session, input: &Input) -> PResult<'a, Vec<ast::Attribute>> {
1060 Input::File(ref ifile) => {
1061 parse::parse_crate_attrs_from_file(ifile, &sess.parse_sess)
1063 Input::Str { ref name, ref input } => {
1064 parse::parse_crate_attrs_from_source_str(name.clone(),
1071 /// Gets a list of extra command-line flags provided by the user, as strings.
1073 /// This function is used during ICEs to show more information useful for
1074 /// debugging, since some ICEs only happens with non-default compiler flags
1075 /// (and the users don't always report them).
1076 fn extra_compiler_flags() -> Option<(Vec<String>, bool)> {
1077 let args = env::args_os().map(|arg| arg.to_string_lossy().to_string()).collect::<Vec<_>>();
1079 // Avoid printing help because of empty args. This can suggest the compiler
1080 // itself is not the program root (consider RLS).
1085 let matches = if let Some(matches) = handle_options(&args) {
1091 let mut result = Vec::new();
1092 let mut excluded_cargo_defaults = false;
1093 for flag in ICE_REPORT_COMPILER_FLAGS {
1094 let prefix = if flag.len() == 1 { "-" } else { "--" };
1096 for content in &matches.opt_strs(flag) {
1097 // Split always returns the first element
1098 let name = if let Some(first) = content.split('=').next() {
1104 let content = if ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE.contains(&name) {
1110 if !ICE_REPORT_COMPILER_FLAGS_EXCLUDE.contains(&name) {
1111 result.push(format!("{}{} {}", prefix, flag, content));
1113 excluded_cargo_defaults = true;
1118 if !result.is_empty() {
1119 Some((result, excluded_cargo_defaults))
1125 /// Runs a procedure which will detect panics in the compiler and print nicer
1126 /// error messages rather than just failing the test.
1128 /// The diagnostic emitter yielded to the procedure should be used for reporting
1129 /// errors of the compiler.
1130 pub fn report_ices_to_stderr_if_any<F: FnOnce() -> R, R>(f: F) -> Result<R, ErrorReported> {
1131 catch_unwind(panic::AssertUnwindSafe(f)).map_err(|value| {
1132 if value.is::<errors::FatalErrorMarker>() {
1135 // Thread panicked without emitting a fatal diagnostic
1139 Box::new(errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
1143 let handler = errors::Handler::with_emitter(true, None, emitter);
1145 // a .span_bug or .bug call has already printed what
1146 // it wants to print.
1147 if !value.is::<errors::ExplicitBug>() {
1148 handler.emit(&MultiSpan::new(),
1150 errors::Level::Bug);
1153 let mut xs: Vec<Cow<'static, str>> = vec![
1154 "the compiler unexpectedly panicked. this is a bug.".into(),
1155 format!("we would appreciate a bug report: {}", BUG_REPORT_URL).into(),
1156 format!("rustc {} running on {}",
1157 option_env!("CFG_VERSION").unwrap_or("unknown_version"),
1158 config::host_triple()).into(),
1161 if let Some((flags, excluded_cargo_defaults)) = extra_compiler_flags() {
1162 xs.push(format!("compiler flags: {}", flags.join(" ")).into());
1164 if excluded_cargo_defaults {
1165 xs.push("some of the compiler flags provided by cargo are hidden".into());
1170 handler.emit(&MultiSpan::new(),
1172 errors::Level::Note);
1175 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
1180 /// This allows tools to enable rust logging without having to magically match rustc's
1181 /// log crate version
1182 pub fn init_rustc_env_logger() {
1183 env_logger::init_from_env("RUSTC_LOG");
1187 let start = Instant::now();
1188 init_rustc_env_logger();
1189 let mut callbacks = TimePassesCallbacks::default();
1190 let result = report_ices_to_stderr_if_any(|| {
1191 let args = env::args_os().enumerate()
1192 .map(|(i, arg)| arg.into_string().unwrap_or_else(|arg| {
1193 early_error(ErrorOutputType::default(),
1194 &format!("Argument {} is not valid Unicode: {:?}", i, arg))
1196 .collect::<Vec<_>>();
1197 run_compiler(&args, &mut callbacks, None, None)
1198 }).and_then(|result| result);
1199 let exit_code = match result {
1200 Ok(_) => EXIT_SUCCESS,
1201 Err(_) => EXIT_FAILURE,
1203 // The extra `\t` is necessary to align this label with the others.
1205 print_time_passes_entry(callbacks.time_passes, "\ttotal", start.elapsed());
1206 process::exit(exit_code);