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/")]
22 #![feature(box_syntax)]
23 #![cfg_attr(unix, feature(libc))]
25 #![feature(rustc_diagnostic_macros)]
26 #![feature(set_stdio)]
30 extern crate graphviz;
31 extern crate env_logger;
35 extern crate rustc_allocator;
36 extern crate rustc_back;
37 extern crate rustc_borrowck;
38 extern crate rustc_const_eval;
39 extern crate rustc_data_structures;
40 extern crate rustc_errors as errors;
41 extern crate rustc_passes;
42 extern crate rustc_lint;
43 extern crate rustc_plugin;
44 extern crate rustc_privacy;
45 extern crate rustc_incremental;
46 extern crate rustc_metadata;
47 extern crate rustc_mir;
48 extern crate rustc_resolve;
49 extern crate rustc_save_analysis;
50 extern crate rustc_trans_utils;
51 extern crate rustc_typeck;
52 extern crate serialize;
56 extern crate syntax_ext;
57 extern crate syntax_pos;
59 use driver::CompileController;
60 use pretty::{PpMode, UserIdentifiedItem};
62 use rustc_resolve as resolve;
63 use rustc_save_analysis as save;
64 use rustc_save_analysis::DumpHandler;
65 use rustc::session::{self, config, Session, build_session, CompileResult};
66 use rustc::session::CompileIncomplete;
67 use rustc::session::config::{Input, PrintRequest, ErrorOutputType};
68 use rustc::session::config::nightly_options;
69 use rustc::session::filesearch;
70 use rustc::session::{early_error, early_warn};
71 use rustc::lint::Lint;
73 use rustc::middle::cstore::CrateStore;
74 use rustc_metadata::locator;
75 use rustc_metadata::cstore::CStore;
76 use rustc_metadata::dynamic_lib::DynamicLibrary;
77 use rustc::util::common::{time, ErrorReported};
78 use rustc_trans_utils::trans_crate::TransCrate;
80 use serialize::json::ToJson;
83 use std::cmp::Ordering::Equal;
85 use std::default::Default;
86 use std::env::consts::{DLL_PREFIX, DLL_SUFFIX};
88 use std::ffi::OsString;
89 use std::io::{self, Read, Write};
90 use std::iter::repeat;
93 use std::path::{PathBuf, Path};
94 use std::process::{self, Command, Stdio};
97 use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
98 use std::sync::{Once, ONCE_INIT};
102 use syntax::codemap::{CodeMap, FileLoader, RealFileLoader};
103 use syntax::feature_gate::{GatedCfg, UnstableFeatures};
104 use syntax::parse::{self, PResult};
105 use syntax_pos::{DUMMY_SP, MultiSpan, FileName};
113 mod derive_registrar;
115 pub mod target_features {
117 use syntax::symbol::Symbol;
118 use rustc::session::Session;
119 use rustc_trans_utils::trans_crate::TransCrate;
121 /// Add `target_feature = "..."` cfgs for a variety of platform
122 /// specific features (SSE, NEON etc.).
124 /// This is performed by checking whether a whitelisted set of
125 /// features is available on the target machine, by querying LLVM.
126 pub fn add_configuration(cfg: &mut ast::CrateConfig, sess: &Session, trans: &TransCrate) {
127 let tf = Symbol::intern("target_feature");
129 for feat in trans.target_features(sess) {
130 cfg.insert((tf, Some(feat)));
133 if sess.crt_static_feature() {
134 cfg.insert((tf, Some(Symbol::intern("crt-static"))));
139 const BUG_REPORT_URL: &'static str = "https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.\
142 const ICE_REPORT_COMPILER_FLAGS: &'static [&'static str] = &[
147 const ICE_REPORT_COMPILER_FLAGS_EXCLUDE: &'static [&'static str] = &[
151 const ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE: &'static [&'static str] = &[
155 pub fn abort_on_err<T>(result: Result<T, CompileIncomplete>, sess: &Session) -> T {
157 Err(CompileIncomplete::Errored(ErrorReported)) => {
158 sess.abort_if_errors();
159 panic!("error reported but abort_if_errors didn't abort???");
161 Err(CompileIncomplete::Stopped) => {
162 sess.fatal("compilation terminated");
168 pub fn run<F>(run_compiler: F) -> isize
169 where F: FnOnce() -> (CompileResult, Option<Session>) + Send + 'static
172 let (result, session) = run_compiler();
173 if let Err(CompileIncomplete::Errored(_)) = result {
176 sess.abort_if_errors();
177 panic!("error reported but abort_if_errors didn't abort???");
181 errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
185 let handler = errors::Handler::with_emitter(true, false, Box::new(emitter));
186 handler.emit(&MultiSpan::new(),
187 "aborting due to previous error(s)",
188 errors::Level::Fatal);
189 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
197 fn load_backend_from_dylib(path: &Path) -> fn() -> Box<TransCrate> {
198 // Note that we're specifically using `open_global_now` here rather than
199 // `open`, namely we want the behavior on Unix of RTLD_GLOBAL and RTLD_NOW,
200 // where NOW means "bind everything right now" because we don't want
201 // surprises later on and RTLD_GLOBAL allows the symbols to be made
202 // available for future dynamic libraries opened. This is currently used by
203 // loading LLVM and then making its symbols available for other dynamic
205 let lib = match DynamicLibrary::open_global_now(path) {
208 let err = format!("couldn't load codegen backend {:?}: {:?}",
211 early_error(ErrorOutputType::default(), &err);
215 match lib.symbol("__rustc_codegen_backend") {
218 mem::transmute::<*mut u8, _>(f)
221 let err = format!("couldn't load codegen backend as it \
222 doesn't export the `__rustc_codegen_backend` \
224 early_error(ErrorOutputType::default(), &err);
230 pub fn get_trans(sess: &Session) -> Box<TransCrate> {
231 static INIT: Once = ONCE_INIT;
232 static mut LOAD: fn() -> Box<TransCrate> = || unreachable!();
235 let trans_name = sess.opts.debugging_opts.codegen_backend.as_ref()
236 .unwrap_or(&sess.target.target.options.codegen_backend);
237 let backend = match &trans_name[..] {
239 rustc_trans_utils::trans_crate::MetadataOnlyTransCrate::new
241 filename if filename.contains(".") => {
242 load_backend_from_dylib(filename.as_ref())
244 trans_name => get_trans_sysroot(trans_name),
251 let backend = unsafe { LOAD() };
256 fn get_trans_sysroot(backend_name: &str) -> fn() -> Box<TransCrate> {
257 // For now we only allow this function to be called once as it'll dlopen a
258 // few things, which seems to work best if we only do that once. In
259 // general this assertion never trips due to the once guard in `get_trans`,
260 // but there's a few manual calls to this function in this file we protect
262 static LOADED: AtomicBool = ATOMIC_BOOL_INIT;
263 assert!(!LOADED.fetch_or(true, Ordering::SeqCst),
264 "cannot load the default trans backend twice");
266 // When we're compiling this library with `--test` it'll run as a binary but
267 // not actually exercise much functionality. As a result most of the logic
268 // here is defunkt (it assumes we're a dynamic library in a sysroot) so
269 // let's just return a dummy creation function which won't be used in
272 return rustc_trans_utils::trans_crate::MetadataOnlyTransCrate::new
275 let target = session::config::host_triple();
276 let mut sysroot_candidates = vec![filesearch::get_or_default_sysroot()];
277 let path = current_dll_path()
278 .and_then(|s| s.canonicalize().ok());
279 if let Some(dll) = path {
280 // use `parent` twice to chop off the file name and then also the
281 // directory containing the dll which should be either `lib` or `bin`.
282 if let Some(path) = dll.parent().and_then(|p| p.parent()) {
283 // The original `path` pointed at the `rustc_driver` crate's dll.
284 // Now that dll should only be in one of two locations. The first is
285 // in the compiler's libdir, for example `$sysroot/lib/*.dll`. The
286 // other is the target's libdir, for example
287 // `$sysroot/lib/rustlib/$target/lib/*.dll`.
289 // We don't know which, so let's assume that if our `path` above
290 // ends in `$target` we *could* be in the target libdir, and always
291 // assume that we may be in the main libdir.
292 sysroot_candidates.push(path.to_owned());
294 if path.ends_with(target) {
295 sysroot_candidates.extend(path.parent() // chop off `$target`
296 .and_then(|p| p.parent()) // chop off `rustlib`
297 .and_then(|p| p.parent()) // chop off `lib`
298 .map(|s| s.to_owned()));
303 let sysroot = sysroot_candidates.iter()
305 let libdir = filesearch::relative_target_lib_path(&sysroot, &target);
307 .with_file_name(option_env!("CFG_CODEGEN_BACKENDS_DIR")
308 .unwrap_or("codegen-backends"))
311 info!("codegen backend candidate: {}", f.display());
315 let sysroot = match sysroot {
318 let candidates = sysroot_candidates.iter()
319 .map(|p| p.display().to_string())
322 let err = format!("failed to find a `codegen-backends` folder \
323 in the sysroot candidates:\n* {}", candidates);
324 early_error(ErrorOutputType::default(), &err);
327 info!("probing {} for a codegen backend", sysroot.display());
329 let d = match sysroot.read_dir() {
332 let err = format!("failed to load default codegen backend, couldn't \
333 read `{}`: {}", sysroot.display(), e);
334 early_error(ErrorOutputType::default(), &err);
338 let mut file: Option<PathBuf> = None;
340 let expected_name = format!("rustc_trans-{}", backend_name);
341 for entry in d.filter_map(|e| e.ok()) {
342 let path = entry.path();
343 let filename = match path.file_name().and_then(|s| s.to_str()) {
347 if !(filename.starts_with(DLL_PREFIX) && filename.ends_with(DLL_SUFFIX)) {
350 let name = &filename[DLL_PREFIX.len() .. filename.len() - DLL_SUFFIX.len()];
351 if name != expected_name {
354 if let Some(ref prev) = file {
355 let err = format!("duplicate codegen backends found\n\
358 ", prev.display(), path.display());
359 early_error(ErrorOutputType::default(), &err);
361 file = Some(path.clone());
365 Some(ref s) => return load_backend_from_dylib(s),
367 let err = format!("failed to load default codegen backend for `{}`, \
368 no appropriate codegen dylib found in `{}`",
369 backend_name, sysroot.display());
370 early_error(ErrorOutputType::default(), &err);
375 fn current_dll_path() -> Option<PathBuf> {
376 use std::ffi::{OsStr, CStr};
377 use std::os::unix::prelude::*;
380 let addr = current_dll_path as usize as *mut _;
381 let mut info = mem::zeroed();
382 if libc::dladdr(addr, &mut info) == 0 {
383 info!("dladdr failed");
386 if info.dli_fname.is_null() {
387 info!("dladdr returned null pointer");
390 let bytes = CStr::from_ptr(info.dli_fname).to_bytes();
391 let os = OsStr::from_bytes(bytes);
392 Some(PathBuf::from(os))
397 fn current_dll_path() -> Option<PathBuf> {
398 use std::ffi::OsString;
399 use std::os::windows::prelude::*;
402 fn GetModuleHandleExW(dwFlags: u32,
404 phModule: *mut usize) -> i32;
405 fn GetModuleFileNameW(hModule: usize,
406 lpFilename: *mut u16,
410 const GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS: u32 = 0x00000004;
414 let r = GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
415 current_dll_path as usize,
418 info!("GetModuleHandleExW failed: {}", io::Error::last_os_error());
421 let mut space = Vec::with_capacity(1024);
422 let r = GetModuleFileNameW(module,
424 space.capacity() as u32);
426 info!("GetModuleFileNameW failed: {}", io::Error::last_os_error());
430 if r >= space.capacity() {
431 info!("our buffer was too small? {}",
432 io::Error::last_os_error());
436 let os = OsString::from_wide(&space);
437 Some(PathBuf::from(os))
442 // Parse args and run the compiler. This is the primary entry point for rustc.
443 // See comments on CompilerCalls below for details about the callbacks argument.
444 // The FileLoader provides a way to load files from sources other than the file system.
445 pub fn run_compiler<'a>(args: &[String],
446 callbacks: &mut CompilerCalls<'a>,
447 file_loader: Option<Box<FileLoader + 'static>>,
448 emitter_dest: Option<Box<Write + Send>>)
449 -> (CompileResult, Option<Session>)
451 macro_rules! do_or_return {($expr: expr, $sess: expr) => {
453 Compilation::Stop => return (Ok(()), $sess),
454 Compilation::Continue => {}
458 let matches = match handle_options(args) {
459 Some(matches) => matches,
460 None => return (Ok(()), None),
463 let (sopts, cfg) = config::build_session_options_and_crate_config(&matches);
465 let descriptions = diagnostics_registry();
467 do_or_return!(callbacks.early_callback(&matches,
474 let (odir, ofile) = make_output(&matches);
475 let (input, input_file_path, input_err) = match make_input(&matches.free) {
476 Some((input, input_file_path, input_err)) => {
477 let (input, input_file_path) = callbacks.some_input(input, input_file_path);
478 (input, input_file_path, input_err)
480 None => match callbacks.no_input(&matches, &sopts, &cfg, &odir, &ofile, &descriptions) {
481 Some((input, input_file_path)) => (input, input_file_path, None),
482 None => return (Ok(()), None),
486 let loader = file_loader.unwrap_or(box RealFileLoader);
487 let codemap = Rc::new(CodeMap::with_file_loader(loader, sopts.file_path_mapping()));
488 let mut sess = session::build_session_with_codemap(
489 sopts, input_file_path.clone(), descriptions, codemap, emitter_dest,
492 if let Some(err) = input_err {
493 // Immediately stop compilation if there was an issue reading
494 // the input (for example if the input stream is not UTF-8).
495 sess.err(&format!("{}", err));
496 return (Err(CompileIncomplete::Stopped), Some(sess));
499 let trans = get_trans(&sess);
501 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
503 let mut cfg = config::build_configuration(&sess, cfg);
504 target_features::add_configuration(&mut cfg, &sess, &*trans);
505 sess.parse_sess.config = cfg;
507 let plugins = sess.opts.debugging_opts.extra_plugins.clone();
509 let cstore = CStore::new(trans.metadata_loader());
511 do_or_return!(callbacks.late_callback(&*trans,
517 &ofile), Some(sess));
519 let control = callbacks.build_controller(&sess, &matches);
521 (driver::compile_input(trans,
533 // Extract output directory and file from matches.
534 fn make_output(matches: &getopts::Matches) -> (Option<PathBuf>, Option<PathBuf>) {
535 let odir = matches.opt_str("out-dir").map(|o| PathBuf::from(&o));
536 let ofile = matches.opt_str("o").map(|o| PathBuf::from(&o));
540 // Extract input (string or file and optional path) from matches.
541 fn make_input(free_matches: &[String]) -> Option<(Input, Option<PathBuf>, Option<io::Error>)> {
542 if free_matches.len() == 1 {
543 let ifile = &free_matches[0];
545 let mut src = String::new();
546 let err = if io::stdin().read_to_string(&mut src).is_err() {
547 Some(io::Error::new(io::ErrorKind::InvalidData,
548 "couldn't read from stdin, as it did not contain valid UTF-8"))
552 Some((Input::Str { name: FileName::Anon, input: src },
555 Some((Input::File(PathBuf::from(ifile)),
556 Some(PathBuf::from(ifile)), None))
563 fn parse_pretty(sess: &Session,
564 matches: &getopts::Matches)
565 -> Option<(PpMode, Option<UserIdentifiedItem>)> {
566 let pretty = if sess.opts.debugging_opts.unstable_options {
567 matches.opt_default("pretty", "normal").map(|a| {
568 // stable pretty-print variants only
569 pretty::parse_pretty(sess, &a, false)
575 if pretty.is_none() {
576 sess.opts.debugging_opts.unpretty.as_ref().map(|a| {
577 // extended with unstable pretty-print variants
578 pretty::parse_pretty(sess, &a, true)
585 // Whether to stop or continue compilation.
586 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
587 pub enum Compilation {
593 pub fn and_then<F: FnOnce() -> Compilation>(self, next: F) -> Compilation {
595 Compilation::Stop => Compilation::Stop,
596 Compilation::Continue => next(),
601 // A trait for customising the compilation process. Offers a number of hooks for
602 // executing custom code or customising input.
603 pub trait CompilerCalls<'a> {
604 // Hook for a callback early in the process of handling arguments. This will
605 // be called straight after options have been parsed but before anything
606 // else (e.g., selecting input and output).
607 fn early_callback(&mut self,
608 _: &getopts::Matches,
610 _: &ast::CrateConfig,
611 _: &errors::registry::Registry,
614 Compilation::Continue
617 // Hook for a callback late in the process of handling arguments. This will
618 // be called just before actual compilation starts (and before build_controller
619 // is called), after all arguments etc. have been completely handled.
620 fn late_callback(&mut self,
622 _: &getopts::Matches,
629 Compilation::Continue
632 // Called after we extract the input from the arguments. Gives the implementer
633 // an opportunity to change the inputs or to add some custom input handling.
634 // The default behaviour is to simply pass through the inputs.
635 fn some_input(&mut self,
637 input_path: Option<PathBuf>)
638 -> (Input, Option<PathBuf>) {
642 // Called after we extract the input from the arguments if there is no valid
643 // input. Gives the implementer an opportunity to supply alternate input (by
644 // returning a Some value) or to add custom behaviour for this error such as
645 // emitting error messages. Returning None will cause compilation to stop
647 fn no_input(&mut self,
648 _: &getopts::Matches,
650 _: &ast::CrateConfig,
653 _: &errors::registry::Registry)
654 -> Option<(Input, Option<PathBuf>)> {
658 // Create a CompilController struct for controlling the behaviour of
660 fn build_controller(&mut self, _: &Session, _: &getopts::Matches) -> CompileController<'a>;
663 // CompilerCalls instance for a regular rustc build.
664 #[derive(Copy, Clone)]
665 pub struct RustcDefaultCalls;
667 // FIXME remove these and use winapi 0.3 instead
668 // Duplicates: bootstrap/compile.rs, librustc_errors/emitter.rs
670 fn stdout_isatty() -> bool {
671 unsafe { libc::isatty(libc::STDOUT_FILENO) != 0 }
675 fn stdout_isatty() -> bool {
678 type HANDLE = *mut u8;
679 type LPDWORD = *mut u32;
680 const STD_OUTPUT_HANDLE: DWORD = -11i32 as DWORD;
682 fn GetStdHandle(which: DWORD) -> HANDLE;
683 fn GetConsoleMode(hConsoleHandle: HANDLE, lpMode: LPDWORD) -> BOOL;
686 let handle = GetStdHandle(STD_OUTPUT_HANDLE);
688 GetConsoleMode(handle, &mut out) != 0
692 fn handle_explain(code: &str,
693 descriptions: &errors::registry::Registry,
694 output: ErrorOutputType) {
695 let normalised = if code.starts_with("E") {
698 format!("E{0:0>4}", code)
700 match descriptions.find_description(&normalised) {
701 Some(ref description) => {
702 let mut is_in_code_block = false;
703 let mut text = String::new();
705 // Slice off the leading newline and print.
706 for line in description[1..].lines() {
707 let indent_level = line.find(|c: char| !c.is_whitespace())
708 .unwrap_or_else(|| line.len());
709 let dedented_line = &line[indent_level..];
710 if dedented_line.starts_with("```") {
711 is_in_code_block = !is_in_code_block;
712 text.push_str(&line[..(indent_level+3)]);
713 } else if is_in_code_block && dedented_line.starts_with("# ") {
722 show_content_with_pager(&text);
728 early_error(output, &format!("no extended information for {}", code));
733 fn show_content_with_pager(content: &String) {
734 let pager_name = env::var_os("PAGER").unwrap_or_else(|| if cfg!(windows) {
735 OsString::from("more.com")
737 OsString::from("less")
740 let mut fallback_to_println = false;
742 match Command::new(pager_name).stdin(Stdio::piped()).spawn() {
744 if let Some(pipe) = pager.stdin.as_mut() {
745 if pipe.write_all(content.as_bytes()).is_err() {
746 fallback_to_println = true;
750 if pager.wait().is_err() {
751 fallback_to_println = true;
755 fallback_to_println = true;
759 // If pager fails for whatever reason, we should still print the content
760 // to standard output
761 if fallback_to_println {
762 print!("{}", content);
766 impl<'a> CompilerCalls<'a> for RustcDefaultCalls {
767 fn early_callback(&mut self,
768 matches: &getopts::Matches,
770 _: &ast::CrateConfig,
771 descriptions: &errors::registry::Registry,
772 output: ErrorOutputType)
774 if let Some(ref code) = matches.opt_str("explain") {
775 handle_explain(code, descriptions, output);
776 return Compilation::Stop;
779 Compilation::Continue
782 fn no_input(&mut self,
783 matches: &getopts::Matches,
784 sopts: &config::Options,
785 cfg: &ast::CrateConfig,
786 odir: &Option<PathBuf>,
787 ofile: &Option<PathBuf>,
788 descriptions: &errors::registry::Registry)
789 -> Option<(Input, Option<PathBuf>)> {
790 match matches.free.len() {
792 let mut sess = build_session(sopts.clone(),
794 descriptions.clone());
795 if sopts.describe_lints {
796 let mut ls = lint::LintStore::new();
797 rustc_lint::register_builtins(&mut ls, Some(&sess));
798 describe_lints(&sess, &ls, false);
801 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
802 let mut cfg = config::build_configuration(&sess, cfg.clone());
803 let trans = get_trans(&sess);
804 target_features::add_configuration(&mut cfg, &sess, &*trans);
805 sess.parse_sess.config = cfg;
806 let should_stop = RustcDefaultCalls::print_crate_info(
814 if should_stop == Compilation::Stop {
817 early_error(sopts.error_format, "no input filename given");
819 1 => panic!("make_input should have provided valid inputs"),
820 _ => early_error(sopts.error_format, "multiple input filenames provided"),
824 fn late_callback(&mut self,
826 matches: &getopts::Matches,
830 odir: &Option<PathBuf>,
831 ofile: &Option<PathBuf>)
833 RustcDefaultCalls::print_crate_info(trans, sess, Some(input), odir, ofile)
834 .and_then(|| RustcDefaultCalls::list_metadata(sess, cstore, matches, input))
837 fn build_controller(&mut self,
839 matches: &getopts::Matches)
840 -> CompileController<'a> {
841 let mut control = CompileController::basic();
843 control.keep_ast = sess.opts.debugging_opts.keep_ast;
844 control.continue_parse_after_error = sess.opts.debugging_opts.continue_parse_after_error;
846 if let Some((ppm, opt_uii)) = parse_pretty(sess, matches) {
847 if ppm.needs_ast_map(&opt_uii) {
848 control.after_hir_lowering.stop = Compilation::Stop;
850 control.after_parse.callback = box move |state| {
851 state.krate = Some(pretty::fold_crate(state.session,
852 state.krate.take().unwrap(),
855 control.after_hir_lowering.callback = box move |state| {
856 pretty::print_after_hir_lowering(state.session,
857 state.cstore.unwrap(),
858 state.hir_map.unwrap(),
859 state.analysis.unwrap(),
860 state.resolutions.unwrap(),
862 &state.expanded_crate.take().unwrap(),
863 state.crate_name.unwrap(),
865 state.arenas.unwrap(),
866 state.output_filenames.unwrap(),
871 control.after_parse.stop = Compilation::Stop;
873 control.after_parse.callback = box move |state| {
874 let krate = pretty::fold_crate(state.session, state.krate.take().unwrap(), ppm);
875 pretty::print_after_parsing(state.session,
886 if sess.opts.debugging_opts.parse_only ||
887 sess.opts.debugging_opts.show_span.is_some() ||
888 sess.opts.debugging_opts.ast_json_noexpand {
889 control.after_parse.stop = Compilation::Stop;
892 if sess.opts.debugging_opts.no_analysis ||
893 sess.opts.debugging_opts.ast_json {
894 control.after_hir_lowering.stop = Compilation::Stop;
897 if sess.opts.debugging_opts.save_analysis {
898 enable_save_analysis(&mut control);
901 if sess.print_fuel_crate.is_some() {
902 let old_callback = control.compilation_done.callback;
903 control.compilation_done.callback = box move |state| {
905 let sess = state.session;
906 println!("Fuel used by {}: {}",
907 sess.print_fuel_crate.as_ref().unwrap(),
908 sess.print_fuel.get());
915 pub fn enable_save_analysis(control: &mut CompileController) {
916 control.keep_ast = true;
917 control.after_analysis.callback = box |state| {
918 time(state.session.time_passes(), "save analysis", || {
919 save::process_crate(state.tcx.unwrap(),
920 state.expanded_crate.unwrap(),
921 state.analysis.unwrap(),
922 state.crate_name.unwrap(),
924 DumpHandler::new(state.out_dir,
925 state.crate_name.unwrap()))
928 control.after_analysis.run_callback_on_error = true;
929 control.make_glob_map = resolve::MakeGlobMap::Yes;
932 impl RustcDefaultCalls {
933 pub fn list_metadata(sess: &Session,
935 matches: &getopts::Matches,
938 let r = matches.opt_strs("Z");
939 if r.contains(&("ls".to_string())) {
941 &Input::File(ref ifile) => {
942 let path = &(*ifile);
943 let mut v = Vec::new();
944 locator::list_file_metadata(&sess.target.target,
946 cstore.metadata_loader(),
949 println!("{}", String::from_utf8(v).unwrap());
951 &Input::Str { .. } => {
952 early_error(ErrorOutputType::default(), "cannot list metadata for stdin");
955 return Compilation::Stop;
958 return Compilation::Continue;
962 fn print_crate_info(trans: &TransCrate,
964 input: Option<&Input>,
965 odir: &Option<PathBuf>,
966 ofile: &Option<PathBuf>)
968 use rustc::session::config::PrintRequest::*;
969 // PrintRequest::NativeStaticLibs is special - printed during linking
970 // (empty iterator returns true)
971 if sess.opts.prints.iter().all(|&p| p==PrintRequest::NativeStaticLibs) {
972 return Compilation::Continue;
975 let attrs = match input {
978 let result = parse_crate_attrs(sess, input);
980 Ok(attrs) => Some(attrs),
981 Err(mut parse_error) => {
983 return Compilation::Stop;
988 for req in &sess.opts.prints {
991 let mut targets = rustc_back::target::get_targets().collect::<Vec<String>>();
993 println!("{}", targets.join("\n"));
995 Sysroot => println!("{}", sess.sysroot().display()),
996 TargetSpec => println!("{}", sess.target.target.to_json().pretty()),
997 FileNames | CrateName => {
998 let input = match input {
999 Some(input) => input,
1000 None => early_error(ErrorOutputType::default(), "no input file provided"),
1002 let attrs = attrs.as_ref().unwrap();
1003 let t_outputs = driver::build_output_filenames(input, odir, ofile, attrs, sess);
1004 let id = rustc_trans_utils::link::find_crate_name(Some(sess), attrs, input);
1005 if *req == PrintRequest::CrateName {
1009 let crate_types = driver::collect_crate_types(sess, attrs);
1010 for &style in &crate_types {
1011 let fname = rustc_trans_utils::link::filename_for_input(
1020 .to_string_lossy());
1024 let allow_unstable_cfg = UnstableFeatures::from_environment()
1025 .is_nightly_build();
1027 let mut cfgs = Vec::new();
1028 for &(name, ref value) in sess.parse_sess.config.iter() {
1029 let gated_cfg = GatedCfg::gate(&ast::MetaItem {
1031 node: ast::MetaItemKind::Word,
1035 // Note that crt-static is a specially recognized cfg
1036 // directive that's printed out here as part of
1037 // rust-lang/rust#37406, but in general the
1038 // `target_feature` cfg is gated under
1039 // rust-lang/rust#29717. For now this is just
1040 // specifically allowing the crt-static cfg and that's
1041 // it, this is intended to get into Cargo and then go
1042 // through to build scripts.
1043 let value = value.as_ref().map(|s| s.as_str());
1044 let value = value.as_ref().map(|s| s.as_ref());
1045 if name != "target_feature" || value != Some("crt-static") {
1046 if !allow_unstable_cfg && gated_cfg.is_some() {
1051 cfgs.push(if let Some(value) = value {
1052 format!("{}=\"{}\"", name, value)
1060 println!("{}", cfg);
1063 RelocationModels | CodeModels | TlsModels | TargetCPUs | TargetFeatures => {
1064 trans.print(*req, sess);
1066 // Any output here interferes with Cargo's parsing of other printed output
1067 PrintRequest::NativeStaticLibs => {}
1070 return Compilation::Stop;
1074 /// Returns a version string such as "0.12.0-dev".
1075 fn release_str() -> Option<&'static str> {
1076 option_env!("CFG_RELEASE")
1079 /// Returns the full SHA1 hash of HEAD of the Git repo from which rustc was built.
1080 fn commit_hash_str() -> Option<&'static str> {
1081 option_env!("CFG_VER_HASH")
1084 /// Returns the "commit date" of HEAD of the Git repo from which rustc was built as a static string.
1085 fn commit_date_str() -> Option<&'static str> {
1086 option_env!("CFG_VER_DATE")
1089 /// Prints version information
1090 pub fn version(binary: &str, matches: &getopts::Matches) {
1091 let verbose = matches.opt_present("verbose");
1095 option_env!("CFG_VERSION").unwrap_or("unknown version"));
1097 fn unw(x: Option<&str>) -> &str {
1098 x.unwrap_or("unknown")
1100 println!("binary: {}", binary);
1101 println!("commit-hash: {}", unw(commit_hash_str()));
1102 println!("commit-date: {}", unw(commit_date_str()));
1103 println!("host: {}", config::host_triple());
1104 println!("release: {}", unw(release_str()));
1105 get_trans_sysroot("llvm")().print_version();
1109 fn usage(verbose: bool, include_unstable_options: bool) {
1110 let groups = if verbose {
1111 config::rustc_optgroups()
1113 config::rustc_short_optgroups()
1115 let mut options = getopts::Options::new();
1116 for option in groups.iter().filter(|x| include_unstable_options || x.is_stable()) {
1117 (option.apply)(&mut options);
1119 let message = format!("Usage: rustc [OPTIONS] INPUT");
1120 let nightly_help = if nightly_options::is_nightly_build() {
1121 "\n -Z help Print internal options for debugging rustc"
1125 let verbose_help = if verbose {
1128 "\n --help -v Print the full set of options rustc accepts"
1130 println!("{}\nAdditional help:
1131 -C help Print codegen options
1133 Print 'lint' options and default settings{}{}\n",
1134 options.usage(&message),
1139 fn describe_lints(sess: &Session, lint_store: &lint::LintStore, loaded_plugins: bool) {
1141 Available lint options:
1142 -W <foo> Warn about <foo>
1146 -F <foo> Forbid <foo> \
1147 (deny <foo> and all attempts to override)
1151 fn sort_lints(sess: &Session, lints: Vec<(&'static Lint, bool)>) -> Vec<&'static Lint> {
1152 let mut lints: Vec<_> = lints.into_iter().map(|(x, _)| x).collect();
1153 lints.sort_by(|x: &&Lint, y: &&Lint| {
1154 match x.default_level(sess).cmp(&y.default_level(sess)) {
1155 // The sort doesn't case-fold but it's doubtful we care.
1156 Equal => x.name.cmp(y.name),
1163 fn sort_lint_groups(lints: Vec<(&'static str, Vec<lint::LintId>, bool)>)
1164 -> Vec<(&'static str, Vec<lint::LintId>)> {
1165 let mut lints: Vec<_> = lints.into_iter().map(|(x, y, _)| (x, y)).collect();
1166 lints.sort_by(|&(x, _): &(&'static str, Vec<lint::LintId>),
1167 &(y, _): &(&'static str, Vec<lint::LintId>)| {
1173 let (plugin, builtin): (Vec<_>, _) = lint_store.get_lints()
1176 .partition(|&(_, p)| p);
1177 let plugin = sort_lints(sess, plugin);
1178 let builtin = sort_lints(sess, builtin);
1180 let (plugin_groups, builtin_groups): (Vec<_>, _) = lint_store.get_lint_groups()
1183 .partition(|&(.., p)| p);
1184 let plugin_groups = sort_lint_groups(plugin_groups);
1185 let builtin_groups = sort_lint_groups(builtin_groups);
1187 let max_name_len = plugin.iter()
1189 .map(|&s| s.name.chars().count())
1192 let padded = |x: &str| {
1193 let mut s = repeat(" ")
1194 .take(max_name_len - x.chars().count())
1195 .collect::<String>();
1200 println!("Lint checks provided by rustc:\n");
1201 println!(" {} {:7.7} {}", padded("name"), "default", "meaning");
1202 println!(" {} {:7.7} {}", padded("----"), "-------", "-------");
1204 let print_lints = |lints: Vec<&Lint>| {
1206 let name = lint.name_lower().replace("_", "-");
1207 println!(" {} {:7.7} {}",
1209 lint.default_level.as_str(),
1215 print_lints(builtin);
1219 let max_name_len = max("warnings".len(),
1220 plugin_groups.iter()
1221 .chain(&builtin_groups)
1222 .map(|&(s, _)| s.chars().count())
1226 let padded = |x: &str| {
1227 let mut s = repeat(" ")
1228 .take(max_name_len - x.chars().count())
1229 .collect::<String>();
1234 println!("Lint groups provided by rustc:\n");
1235 println!(" {} {}", padded("name"), "sub-lints");
1236 println!(" {} {}", padded("----"), "---------");
1237 println!(" {} {}", padded("warnings"), "all lints that are set to issue warnings");
1239 let print_lint_groups = |lints: Vec<(&'static str, Vec<lint::LintId>)>| {
1240 for (name, to) in lints {
1241 let name = name.to_lowercase().replace("_", "-");
1242 let desc = to.into_iter()
1243 .map(|x| x.to_string().replace("_", "-"))
1244 .collect::<Vec<String>>()
1246 println!(" {} {}", padded(&name), desc);
1251 print_lint_groups(builtin_groups);
1253 match (loaded_plugins, plugin.len(), plugin_groups.len()) {
1254 (false, 0, _) | (false, _, 0) => {
1255 println!("Compiler plugins can provide additional lints and lint groups. To see a \
1256 listing of these, re-run `rustc -W help` with a crate filename.");
1258 (false, ..) => panic!("didn't load lint plugins but got them anyway!"),
1259 (true, 0, 0) => println!("This crate does not load any lint plugins or lint groups."),
1262 println!("Lint checks provided by plugins loaded by this crate:\n");
1263 print_lints(plugin);
1266 println!("Lint groups provided by plugins loaded by this crate:\n");
1267 print_lint_groups(plugin_groups);
1273 fn describe_debug_flags() {
1274 println!("\nAvailable debug options:\n");
1275 print_flag_list("-Z", config::DB_OPTIONS);
1278 fn describe_codegen_flags() {
1279 println!("\nAvailable codegen options:\n");
1280 print_flag_list("-C", config::CG_OPTIONS);
1283 fn print_flag_list<T>(cmdline_opt: &str,
1284 flag_list: &[(&'static str, T, Option<&'static str>, &'static str)]) {
1285 let max_len = flag_list.iter()
1286 .map(|&(name, _, opt_type_desc, _)| {
1287 let extra_len = match opt_type_desc {
1291 name.chars().count() + extra_len
1296 for &(name, _, opt_type_desc, desc) in flag_list {
1297 let (width, extra) = match opt_type_desc {
1298 Some(..) => (max_len - 4, "=val"),
1299 None => (max_len, ""),
1301 println!(" {} {:>width$}{} -- {}",
1303 name.replace("_", "-"),
1310 /// Process command line options. Emits messages as appropriate. If compilation
1311 /// should continue, returns a getopts::Matches object parsed from args,
1312 /// otherwise returns None.
1314 /// The compiler's handling of options is a little complicated as it ties into
1315 /// our stability story, and it's even *more* complicated by historical
1316 /// accidents. The current intention of each compiler option is to have one of
1319 /// 1. An option is stable and can be used everywhere.
1320 /// 2. An option is unstable, but was historically allowed on the stable
1322 /// 3. An option is unstable, and can only be used on nightly.
1324 /// Like unstable library and language features, however, unstable options have
1325 /// always required a form of "opt in" to indicate that you're using them. This
1326 /// provides the easy ability to scan a code base to check to see if anything
1327 /// unstable is being used. Currently, this "opt in" is the `-Z` "zed" flag.
1329 /// All options behind `-Z` are considered unstable by default. Other top-level
1330 /// options can also be considered unstable, and they were unlocked through the
1331 /// `-Z unstable-options` flag. Note that `-Z` remains to be the root of
1332 /// instability in both cases, though.
1334 /// So with all that in mind, the comments below have some more detail about the
1335 /// contortions done here to get things to work out correctly.
1336 pub fn handle_options(args: &[String]) -> Option<getopts::Matches> {
1337 // Throw away the first argument, the name of the binary
1338 let args = &args[1..];
1340 if args.is_empty() {
1341 // user did not write `-v` nor `-Z unstable-options`, so do not
1342 // include that extra information.
1343 usage(false, false);
1347 // Parse with *all* options defined in the compiler, we don't worry about
1348 // option stability here we just want to parse as much as possible.
1349 let mut options = getopts::Options::new();
1350 for option in config::rustc_optgroups() {
1351 (option.apply)(&mut options);
1353 let matches = match options.parse(args) {
1355 Err(f) => early_error(ErrorOutputType::default(), &f.to_string()),
1358 // For all options we just parsed, we check a few aspects:
1360 // * If the option is stable, we're all good
1361 // * If the option wasn't passed, we're all good
1362 // * If `-Z unstable-options` wasn't passed (and we're not a -Z option
1363 // ourselves), then we require the `-Z unstable-options` flag to unlock
1364 // this option that was passed.
1365 // * If we're a nightly compiler, then unstable options are now unlocked, so
1366 // we're good to go.
1367 // * Otherwise, if we're a truly unstable option then we generate an error
1368 // (unstable option being used on stable)
1369 // * If we're a historically stable-but-should-be-unstable option then we
1370 // emit a warning that we're going to turn this into an error soon.
1371 nightly_options::check_nightly_options(&matches, &config::rustc_optgroups());
1373 if matches.opt_present("h") || matches.opt_present("help") {
1374 // Only show unstable options in --help if we *really* accept unstable
1375 // options, which catches the case where we got `-Z unstable-options` on
1376 // the stable channel of Rust which was accidentally allowed
1378 usage(matches.opt_present("verbose"),
1379 nightly_options::is_unstable_enabled(&matches));
1383 // Don't handle -W help here, because we might first load plugins.
1384 let r = matches.opt_strs("Z");
1385 if r.iter().any(|x| *x == "help") {
1386 describe_debug_flags();
1390 let cg_flags = matches.opt_strs("C");
1391 if cg_flags.iter().any(|x| *x == "help") {
1392 describe_codegen_flags();
1396 if cg_flags.iter().any(|x| *x == "no-stack-check") {
1397 early_warn(ErrorOutputType::default(),
1398 "the --no-stack-check flag is deprecated and does nothing");
1401 if cg_flags.contains(&"passes=list".to_string()) {
1402 get_trans_sysroot("llvm")().print_passes();
1406 if matches.opt_present("version") {
1407 version("rustc", &matches);
1414 fn parse_crate_attrs<'a>(sess: &'a Session, input: &Input) -> PResult<'a, Vec<ast::Attribute>> {
1416 Input::File(ref ifile) => {
1417 parse::parse_crate_attrs_from_file(ifile, &sess.parse_sess)
1419 Input::Str { ref name, ref input } => {
1420 parse::parse_crate_attrs_from_source_str(name.clone(),
1427 /// Runs `f` in a suitable thread for running `rustc`; returns a
1428 /// `Result` with either the return value of `f` or -- if a panic
1429 /// occurs -- the panic value.
1430 pub fn in_rustc_thread<F, R>(f: F) -> Result<R, Box<Any + Send>>
1431 where F: FnOnce() -> R + Send + 'static,
1434 // Temporarily have stack size set to 16MB to deal with nom-using crates failing
1435 const STACK_SIZE: usize = 16 * 1024 * 1024; // 16MB
1437 let mut cfg = thread::Builder::new().name("rustc".to_string());
1439 // FIXME: Hacks on hacks. If the env is trying to override the stack size
1440 // then *don't* set it explicitly.
1441 if env::var_os("RUST_MIN_STACK").is_none() {
1442 cfg = cfg.stack_size(STACK_SIZE);
1445 let thread = cfg.spawn(f);
1446 thread.unwrap().join()
1449 /// Get a list of extra command-line flags provided by the user, as strings.
1451 /// This function is used during ICEs to show more information useful for
1452 /// debugging, since some ICEs only happens with non-default compiler flags
1453 /// (and the users don't always report them).
1454 fn extra_compiler_flags() -> Option<(Vec<String>, bool)> {
1455 let mut args = Vec::new();
1456 for arg in env::args_os() {
1457 args.push(arg.to_string_lossy().to_string());
1460 let matches = if let Some(matches) = handle_options(&args) {
1466 let mut result = Vec::new();
1467 let mut excluded_cargo_defaults = false;
1468 for flag in ICE_REPORT_COMPILER_FLAGS {
1469 let prefix = if flag.len() == 1 { "-" } else { "--" };
1471 for content in &matches.opt_strs(flag) {
1472 // Split always returns the first element
1473 let name = if let Some(first) = content.split('=').next() {
1479 let content = if ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE.contains(&name) {
1485 if !ICE_REPORT_COMPILER_FLAGS_EXCLUDE.contains(&name) {
1486 result.push(format!("{}{} {}", prefix, flag, content));
1488 excluded_cargo_defaults = true;
1493 if result.len() > 0 {
1494 Some((result, excluded_cargo_defaults))
1500 /// Run a procedure which will detect panics in the compiler and print nicer
1501 /// error messages rather than just failing the test.
1503 /// The diagnostic emitter yielded to the procedure should be used for reporting
1504 /// errors of the compiler.
1505 pub fn monitor<F: FnOnce() + Send + 'static>(f: F) {
1506 let result = in_rustc_thread(move || {
1510 if let Err(value) = result {
1511 // Thread panicked without emitting a fatal diagnostic
1512 if !value.is::<errors::FatalErrorMarker>() {
1517 Box::new(errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
1521 let handler = errors::Handler::with_emitter(true, false, emitter);
1523 // a .span_bug or .bug call has already printed what
1524 // it wants to print.
1525 if !value.is::<errors::ExplicitBug>() {
1526 handler.emit(&MultiSpan::new(),
1528 errors::Level::Bug);
1532 "the compiler unexpectedly panicked. this is a bug.".to_string(),
1533 format!("we would appreciate a bug report: {}", BUG_REPORT_URL),
1534 format!("rustc {} running on {}",
1535 option_env!("CFG_VERSION").unwrap_or("unknown_version"),
1536 config::host_triple()),
1539 if let Some((flags, excluded_cargo_defaults)) = extra_compiler_flags() {
1540 xs.push(format!("compiler flags: {}", flags.join(" ")));
1542 if excluded_cargo_defaults {
1543 xs.push("some of the compiler flags provided by cargo are hidden".to_string());
1548 handler.emit(&MultiSpan::new(),
1550 errors::Level::Note);
1554 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
1558 pub fn diagnostics_registry() -> errors::registry::Registry {
1559 use errors::registry::Registry;
1561 let mut all_errors = Vec::new();
1562 all_errors.extend_from_slice(&rustc::DIAGNOSTICS);
1563 all_errors.extend_from_slice(&rustc_typeck::DIAGNOSTICS);
1564 all_errors.extend_from_slice(&rustc_resolve::DIAGNOSTICS);
1565 all_errors.extend_from_slice(&rustc_privacy::DIAGNOSTICS);
1566 // FIXME: need to figure out a way to get these back in here
1567 // all_errors.extend_from_slice(get_trans(sess).diagnostics());
1568 all_errors.extend_from_slice(&rustc_trans_utils::DIAGNOSTICS);
1569 all_errors.extend_from_slice(&rustc_const_eval::DIAGNOSTICS);
1570 all_errors.extend_from_slice(&rustc_metadata::DIAGNOSTICS);
1571 all_errors.extend_from_slice(&rustc_passes::DIAGNOSTICS);
1572 all_errors.extend_from_slice(&rustc_plugin::DIAGNOSTICS);
1573 all_errors.extend_from_slice(&rustc_mir::DIAGNOSTICS);
1574 all_errors.extend_from_slice(&syntax::DIAGNOSTICS);
1576 Registry::new(&all_errors)
1580 env_logger::init().unwrap();
1581 let result = run(|| {
1582 let args = env::args_os().enumerate()
1583 .map(|(i, arg)| arg.into_string().unwrap_or_else(|arg| {
1584 early_error(ErrorOutputType::default(),
1585 &format!("Argument {} is not valid Unicode: {:?}", i, arg))
1587 .collect::<Vec<_>>();
1589 &mut RustcDefaultCalls,
1593 process::exit(result as i32);