| //! The Rust compiler. |
| //! |
| //! # Note |
| //! |
| //! This API is completely unstable and subject to change. |
| |
| #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")] |
| #![doc(rust_logo)] |
| #![feature(rustdoc_internals)] |
| #![allow(internal_features)] |
| #![feature(decl_macro)] |
| #![feature(lazy_cell)] |
| #![feature(let_chains)] |
| #![feature(panic_update_hook)] |
| #![recursion_limit = "256"] |
| #![allow(rustc::potential_query_instability)] |
| #![deny(rustc::untranslatable_diagnostic)] |
| #![deny(rustc::diagnostic_outside_of_impl)] |
| |
| #[macro_use] |
| extern crate tracing; |
| |
| use rustc_ast as ast; |
| use rustc_codegen_ssa::{traits::CodegenBackend, CodegenErrors, CodegenResults}; |
| use rustc_data_structures::profiling::{ |
| get_resident_set_size, print_time_passes_entry, TimePassesFormat, |
| }; |
| use rustc_data_structures::sync::SeqCst; |
| use rustc_errors::registry::{InvalidErrorCode, Registry}; |
| use rustc_errors::{markdown, ColorConfig}; |
| use rustc_errors::{DiagnosticMessage, ErrorGuaranteed, Handler, PResult, SubdiagnosticMessage}; |
| use rustc_feature::find_gated_cfg; |
| use rustc_fluent_macro::fluent_messages; |
| use rustc_interface::util::{self, collect_crate_types, get_codegen_backend}; |
| use rustc_interface::{interface, Queries}; |
| use rustc_lint::unerased_lint_store; |
| use rustc_metadata::locator; |
| use rustc_session::config::{nightly_options, CG_OPTIONS, Z_OPTIONS}; |
| use rustc_session::config::{ErrorOutputType, Input, OutFileName, OutputType, TrimmedDefPaths}; |
| use rustc_session::cstore::MetadataLoader; |
| use rustc_session::getopts::{self, Matches}; |
| use rustc_session::lint::{Lint, LintId}; |
| use rustc_session::{config, EarlyErrorHandler, Session}; |
| use rustc_span::def_id::LOCAL_CRATE; |
| use rustc_span::source_map::FileLoader; |
| use rustc_span::symbol::sym; |
| use rustc_span::FileName; |
| use rustc_target::json::ToJson; |
| use rustc_target::spec::{Target, TargetTriple}; |
| |
| use std::cmp::max; |
| use std::collections::BTreeMap; |
| use std::env; |
| use std::ffi::OsString; |
| use std::fmt::Write as _; |
| use std::fs::{self, File}; |
| use std::io::{self, IsTerminal, Read, Write}; |
| use std::panic::{self, catch_unwind, PanicInfo}; |
| use std::path::PathBuf; |
| use std::process::{self, Command, Stdio}; |
| use std::str; |
| use std::sync::atomic::{AtomicBool, Ordering}; |
| use std::sync::{Arc, OnceLock}; |
| use std::time::{Instant, SystemTime}; |
| use time::OffsetDateTime; |
| |
| #[allow(unused_macros)] |
| macro do_not_use_print($($t:tt)*) { |
| std::compile_error!( |
| "Don't use `print` or `println` here, use `safe_print` or `safe_println` instead" |
| ) |
| } |
| |
| #[allow(unused_macros)] |
| macro do_not_use_safe_print($($t:tt)*) { |
| std::compile_error!("Don't use `safe_print` or `safe_println` here, use `println_info` instead") |
| } |
| |
| // This import blocks the use of panicking `print` and `println` in all the code |
| // below. Please use `safe_print` and `safe_println` to avoid ICE when |
| // encountering an I/O error during print. |
| #[allow(unused_imports)] |
| use {do_not_use_print as print, do_not_use_print as println}; |
| |
| pub mod args; |
| pub mod pretty; |
| #[macro_use] |
| mod print; |
| mod session_diagnostics; |
| #[cfg(all(unix, any(target_env = "gnu", target_os = "macos")))] |
| mod signal_handler; |
| |
| #[cfg(not(all(unix, any(target_env = "gnu", target_os = "macos"))))] |
| mod signal_handler { |
| /// On platforms which don't support our signal handler's requirements, |
| /// simply use the default signal handler provided by std. |
| pub(super) fn install() {} |
| } |
| |
| use crate::session_diagnostics::{ |
| RLinkEmptyVersionNumber, RLinkEncodingVersionMismatch, RLinkRustcVersionMismatch, |
| RLinkWrongFileType, RlinkNotAFile, RlinkUnableToRead, |
| }; |
| |
| fluent_messages! { "../messages.ftl" } |
| |
| pub static DEFAULT_LOCALE_RESOURCES: &[&str] = &[ |
| // tidy-alphabetical-start |
| crate::DEFAULT_LOCALE_RESOURCE, |
| rustc_ast_lowering::DEFAULT_LOCALE_RESOURCE, |
| rustc_ast_passes::DEFAULT_LOCALE_RESOURCE, |
| rustc_attr::DEFAULT_LOCALE_RESOURCE, |
| rustc_borrowck::DEFAULT_LOCALE_RESOURCE, |
| rustc_builtin_macros::DEFAULT_LOCALE_RESOURCE, |
| rustc_codegen_ssa::DEFAULT_LOCALE_RESOURCE, |
| rustc_const_eval::DEFAULT_LOCALE_RESOURCE, |
| rustc_error_messages::DEFAULT_LOCALE_RESOURCE, |
| rustc_errors::DEFAULT_LOCALE_RESOURCE, |
| rustc_expand::DEFAULT_LOCALE_RESOURCE, |
| rustc_hir_analysis::DEFAULT_LOCALE_RESOURCE, |
| rustc_hir_typeck::DEFAULT_LOCALE_RESOURCE, |
| rustc_incremental::DEFAULT_LOCALE_RESOURCE, |
| rustc_infer::DEFAULT_LOCALE_RESOURCE, |
| rustc_interface::DEFAULT_LOCALE_RESOURCE, |
| rustc_lint::DEFAULT_LOCALE_RESOURCE, |
| rustc_metadata::DEFAULT_LOCALE_RESOURCE, |
| rustc_middle::DEFAULT_LOCALE_RESOURCE, |
| rustc_mir_build::DEFAULT_LOCALE_RESOURCE, |
| rustc_mir_dataflow::DEFAULT_LOCALE_RESOURCE, |
| rustc_mir_transform::DEFAULT_LOCALE_RESOURCE, |
| rustc_monomorphize::DEFAULT_LOCALE_RESOURCE, |
| rustc_parse::DEFAULT_LOCALE_RESOURCE, |
| rustc_passes::DEFAULT_LOCALE_RESOURCE, |
| rustc_privacy::DEFAULT_LOCALE_RESOURCE, |
| rustc_query_system::DEFAULT_LOCALE_RESOURCE, |
| rustc_resolve::DEFAULT_LOCALE_RESOURCE, |
| rustc_session::DEFAULT_LOCALE_RESOURCE, |
| rustc_trait_selection::DEFAULT_LOCALE_RESOURCE, |
| rustc_ty_utils::DEFAULT_LOCALE_RESOURCE, |
| // tidy-alphabetical-end |
| ]; |
| |
| /// Exit status code used for successful compilation and help output. |
| pub const EXIT_SUCCESS: i32 = 0; |
| |
| /// Exit status code used for compilation failures and invalid flags. |
| pub const EXIT_FAILURE: i32 = 1; |
| |
| pub const DEFAULT_BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust/issues/new\ |
| ?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md"; |
| |
| pub fn abort_on_err<T>(result: Result<T, ErrorGuaranteed>, sess: &Session) -> T { |
| match result { |
| Err(..) => { |
| sess.abort_if_errors(); |
| panic!("error reported but abort_if_errors didn't abort???"); |
| } |
| Ok(x) => x, |
| } |
| } |
| |
| pub trait Callbacks { |
| /// Called before creating the compiler instance |
| fn config(&mut self, _config: &mut interface::Config) {} |
| /// Called after parsing the crate root. Submodules are not yet parsed when |
| /// this callback is called. Return value instructs the compiler whether to |
| /// continue the compilation afterwards (defaults to `Compilation::Continue`) |
| fn after_crate_root_parsing<'tcx>( |
| &mut self, |
| _compiler: &interface::Compiler, |
| _queries: &'tcx Queries<'tcx>, |
| ) -> Compilation { |
| Compilation::Continue |
| } |
| /// Called after expansion. Return value instructs the compiler whether to |
| /// continue the compilation afterwards (defaults to `Compilation::Continue`) |
| fn after_expansion<'tcx>( |
| &mut self, |
| _compiler: &interface::Compiler, |
| _queries: &'tcx Queries<'tcx>, |
| ) -> Compilation { |
| Compilation::Continue |
| } |
| /// Called after analysis. Return value instructs the compiler whether to |
| /// continue the compilation afterwards (defaults to `Compilation::Continue`) |
| fn after_analysis<'tcx>( |
| &mut self, |
| _compiler: &interface::Compiler, |
| _queries: &'tcx Queries<'tcx>, |
| ) -> Compilation { |
| Compilation::Continue |
| } |
| } |
| |
| #[derive(Default)] |
| pub struct TimePassesCallbacks { |
| time_passes: Option<TimePassesFormat>, |
| } |
| |
| impl Callbacks for TimePassesCallbacks { |
| // JUSTIFICATION: the session doesn't exist at this point. |
| #[allow(rustc::bad_opt_access)] |
| fn config(&mut self, config: &mut interface::Config) { |
| // If a --print=... option has been given, we don't print the "total" |
| // time because it will mess up the --print output. See #64339. |
| // |
| self.time_passes = (config.opts.prints.is_empty() && config.opts.unstable_opts.time_passes) |
| .then(|| config.opts.unstable_opts.time_passes_format); |
| config.opts.trimmed_def_paths = TrimmedDefPaths::GoodPath; |
| } |
| } |
| |
| pub fn diagnostics_registry() -> Registry { |
| Registry::new(rustc_error_codes::DIAGNOSTICS) |
| } |
| |
| /// This is the primary entry point for rustc. |
| pub struct RunCompiler<'a, 'b> { |
| at_args: &'a [String], |
| callbacks: &'b mut (dyn Callbacks + Send), |
| file_loader: Option<Box<dyn FileLoader + Send + Sync>>, |
| make_codegen_backend: |
| Option<Box<dyn FnOnce(&config::Options) -> Box<dyn CodegenBackend> + Send>>, |
| using_internal_features: Arc<std::sync::atomic::AtomicBool>, |
| } |
| |
| impl<'a, 'b> RunCompiler<'a, 'b> { |
| pub fn new(at_args: &'a [String], callbacks: &'b mut (dyn Callbacks + Send)) -> Self { |
| Self { |
| at_args, |
| callbacks, |
| file_loader: None, |
| make_codegen_backend: None, |
| using_internal_features: Arc::default(), |
| } |
| } |
| |
| /// Set a custom codegen backend. |
| /// |
| /// Has no uses within this repository, but is used by bjorn3 for "the |
| /// hotswapping branch of cg_clif" for "setting the codegen backend from a |
| /// custom driver where the custom codegen backend has arbitrary data." |
| /// (See #102759.) |
| pub fn set_make_codegen_backend( |
| &mut self, |
| make_codegen_backend: Option< |
| Box<dyn FnOnce(&config::Options) -> Box<dyn CodegenBackend> + Send>, |
| >, |
| ) -> &mut Self { |
| self.make_codegen_backend = make_codegen_backend; |
| self |
| } |
| |
| /// Load files from sources other than the file system. |
| /// |
| /// Has no uses within this repository, but may be used in the future by |
| /// bjorn3 for "hooking rust-analyzer's VFS into rustc at some point for |
| /// running rustc without having to save". (See #102759.) |
| pub fn set_file_loader( |
| &mut self, |
| file_loader: Option<Box<dyn FileLoader + Send + Sync>>, |
| ) -> &mut Self { |
| self.file_loader = file_loader; |
| self |
| } |
| |
| /// Set the session-global flag that checks whether internal features have been used, |
| /// suppressing the message about submitting an issue in ICEs when enabled. |
| #[must_use] |
| pub fn set_using_internal_features(mut self, using_internal_features: Arc<AtomicBool>) -> Self { |
| self.using_internal_features = using_internal_features; |
| self |
| } |
| |
| /// Parse args and run the compiler. |
| pub fn run(self) -> interface::Result<()> { |
| run_compiler( |
| self.at_args, |
| self.callbacks, |
| self.file_loader, |
| self.make_codegen_backend, |
| self.using_internal_features, |
| ) |
| } |
| } |
| |
| fn run_compiler( |
| at_args: &[String], |
| callbacks: &mut (dyn Callbacks + Send), |
| file_loader: Option<Box<dyn FileLoader + Send + Sync>>, |
| make_codegen_backend: Option< |
| Box<dyn FnOnce(&config::Options) -> Box<dyn CodegenBackend> + Send>, |
| >, |
| using_internal_features: Arc<std::sync::atomic::AtomicBool>, |
| ) -> interface::Result<()> { |
| let mut default_handler = EarlyErrorHandler::new(ErrorOutputType::default()); |
| |
| // Throw away the first argument, the name of the binary. |
| // In case of at_args being empty, as might be the case by |
| // passing empty argument array to execve under some platforms, |
| // just use an empty slice. |
| // |
| // This situation was possible before due to arg_expand_all being |
| // called before removing the argument, enabling a crash by calling |
| // the compiler with @empty_file as argv[0] and no more arguments. |
| let at_args = at_args.get(1..).unwrap_or_default(); |
| |
| let args = args::arg_expand_all(&default_handler, at_args); |
| |
| let Some(matches) = handle_options(&default_handler, &args) else { return Ok(()) }; |
| |
| let sopts = config::build_session_options(&mut default_handler, &matches); |
| |
| if let Some(ref code) = matches.opt_str("explain") { |
| handle_explain(&default_handler, diagnostics_registry(), code, sopts.color); |
| return Ok(()); |
| } |
| |
| let (odir, ofile) = make_output(&matches); |
| let mut config = interface::Config { |
| opts: sopts, |
| crate_cfg: matches.opt_strs("cfg"), |
| crate_check_cfg: matches.opt_strs("check-cfg"), |
| input: Input::File(PathBuf::new()), |
| output_file: ofile, |
| output_dir: odir, |
| ice_file: ice_path().clone(), |
| file_loader, |
| locale_resources: DEFAULT_LOCALE_RESOURCES, |
| lint_caps: Default::default(), |
| parse_sess_created: None, |
| hash_untracked_state: None, |
| register_lints: None, |
| override_queries: None, |
| make_codegen_backend, |
| registry: diagnostics_registry(), |
| using_internal_features, |
| expanded_args: args, |
| }; |
| |
| let has_input = match make_input(&default_handler, &matches.free) { |
| Err(reported) => return Err(reported), |
| Ok(Some(input)) => { |
| config.input = input; |
| true // has input: normal compilation |
| } |
| Ok(None) => match matches.free.len() { |
| 0 => false, // no input: we will exit early |
| 1 => panic!("make_input should have provided valid inputs"), |
| _ => default_handler.early_error(format!( |
| "multiple input filenames provided (first two filenames are `{}` and `{}`)", |
| matches.free[0], matches.free[1], |
| )), |
| }, |
| }; |
| |
| callbacks.config(&mut config); |
| |
| default_handler.abort_if_errors(); |
| drop(default_handler); |
| |
| interface::run_compiler(config, |compiler| { |
| let sess = compiler.session(); |
| let codegen_backend = compiler.codegen_backend(); |
| let handler = EarlyErrorHandler::new(sess.opts.error_format); |
| |
| if !has_input { |
| if sess.opts.describe_lints { |
| describe_lints(sess); |
| return sess.compile_status(); |
| } |
| let should_stop = print_crate_info(&handler, codegen_backend, sess, false); |
| if should_stop == Compilation::Continue { |
| handler.early_error("no input filename given") |
| } |
| return sess.compile_status(); |
| } |
| |
| let should_stop = print_crate_info(&handler, codegen_backend, sess, true) |
| .and_then(|| list_metadata(&handler, sess, &*codegen_backend.metadata_loader())) |
| .and_then(|| try_process_rlink(sess, compiler)); |
| |
| if should_stop == Compilation::Stop { |
| return sess.compile_status(); |
| } |
| |
| let linker = compiler.enter(|queries| { |
| let early_exit = || sess.compile_status().map(|_| None); |
| queries.parse()?; |
| |
| if let Some(ppm) = &sess.opts.pretty { |
| if ppm.needs_ast_map() { |
| queries.global_ctxt()?.enter(|tcx| { |
| tcx.ensure().early_lint_checks(()); |
| pretty::print(sess, *ppm, pretty::PrintExtra::NeedsAstMap { tcx }); |
| Ok(()) |
| })?; |
| |
| // Make sure the `output_filenames` query is run for its side |
| // effects of writing the dep-info and reporting errors. |
| queries.global_ctxt()?.enter(|tcx| tcx.output_filenames(())); |
| } else { |
| let krate = queries.parse()?; |
| pretty::print( |
| sess, |
| *ppm, |
| pretty::PrintExtra::AfterParsing { krate: &*krate.borrow() }, |
| ); |
| } |
| trace!("finished pretty-printing"); |
| return early_exit(); |
| } |
| |
| if callbacks.after_crate_root_parsing(compiler, queries) == Compilation::Stop { |
| return early_exit(); |
| } |
| |
| if sess.opts.unstable_opts.parse_only || sess.opts.unstable_opts.show_span.is_some() { |
| return early_exit(); |
| } |
| |
| if sess.opts.describe_lints { |
| describe_lints(sess); |
| return early_exit(); |
| } |
| |
| // Make sure name resolution and macro expansion is run. |
| queries.global_ctxt()?.enter(|tcx| tcx.resolver_for_lowering(())); |
| |
| if callbacks.after_expansion(compiler, queries) == Compilation::Stop { |
| return early_exit(); |
| } |
| |
| // Make sure the `output_filenames` query is run for its side |
| // effects of writing the dep-info and reporting errors. |
| queries.global_ctxt()?.enter(|tcx| tcx.output_filenames(())); |
| |
| if sess.opts.output_types.contains_key(&OutputType::DepInfo) |
| && sess.opts.output_types.len() == 1 |
| { |
| return early_exit(); |
| } |
| |
| if sess.opts.unstable_opts.no_analysis { |
| return early_exit(); |
| } |
| |
| queries.global_ctxt()?.enter(|tcx| tcx.analysis(()))?; |
| |
| if callbacks.after_analysis(compiler, queries) == Compilation::Stop { |
| return early_exit(); |
| } |
| |
| let ongoing_codegen = queries.ongoing_codegen()?; |
| |
| if sess.opts.unstable_opts.print_type_sizes { |
| sess.code_stats.print_type_sizes(); |
| } |
| |
| if sess.opts.unstable_opts.print_vtable_sizes { |
| let crate_name = queries.global_ctxt()?.enter(|tcx| tcx.crate_name(LOCAL_CRATE)); |
| |
| sess.code_stats.print_vtable_sizes(crate_name); |
| } |
| |
| let linker = queries.linker(ongoing_codegen)?; |
| Ok(Some(linker)) |
| })?; |
| |
| if let Some(linker) = linker { |
| let _timer = sess.timer("link"); |
| linker.link(sess, codegen_backend)? |
| } |
| |
| if sess.opts.unstable_opts.print_fuel.is_some() { |
| eprintln!( |
| "Fuel used by {}: {}", |
| sess.opts.unstable_opts.print_fuel.as_ref().unwrap(), |
| sess.print_fuel.load(SeqCst) |
| ); |
| } |
| |
| Ok(()) |
| }) |
| } |
| |
| // Extract output directory and file from matches. |
| fn make_output(matches: &getopts::Matches) -> (Option<PathBuf>, Option<OutFileName>) { |
| let odir = matches.opt_str("out-dir").map(|o| PathBuf::from(&o)); |
| let ofile = matches.opt_str("o").map(|o| match o.as_str() { |
| "-" => OutFileName::Stdout, |
| path => OutFileName::Real(PathBuf::from(path)), |
| }); |
| (odir, ofile) |
| } |
| |
| // Extract input (string or file and optional path) from matches. |
| fn make_input( |
| handler: &EarlyErrorHandler, |
| free_matches: &[String], |
| ) -> Result<Option<Input>, ErrorGuaranteed> { |
| if free_matches.len() == 1 { |
| let ifile = &free_matches[0]; |
| if ifile == "-" { |
| let mut src = String::new(); |
| if io::stdin().read_to_string(&mut src).is_err() { |
| // Immediately stop compilation if there was an issue reading |
| // the input (for example if the input stream is not UTF-8). |
| let reported = handler.early_error_no_abort( |
| "couldn't read from stdin, as it did not contain valid UTF-8", |
| ); |
| return Err(reported); |
| } |
| if let Ok(path) = env::var("UNSTABLE_RUSTDOC_TEST_PATH") { |
| let line = env::var("UNSTABLE_RUSTDOC_TEST_LINE").expect( |
| "when UNSTABLE_RUSTDOC_TEST_PATH is set \ |
| UNSTABLE_RUSTDOC_TEST_LINE also needs to be set", |
| ); |
| let line = isize::from_str_radix(&line, 10) |
| .expect("UNSTABLE_RUSTDOC_TEST_LINE needs to be an number"); |
| let file_name = FileName::doc_test_source_code(PathBuf::from(path), line); |
| Ok(Some(Input::Str { name: file_name, input: src })) |
| } else { |
| Ok(Some(Input::Str { name: FileName::anon_source_code(&src), input: src })) |
| } |
| } else { |
| Ok(Some(Input::File(PathBuf::from(ifile)))) |
| } |
| } else { |
| Ok(None) |
| } |
| } |
| |
| /// Whether to stop or continue compilation. |
| #[derive(Copy, Clone, Debug, Eq, PartialEq)] |
| pub enum Compilation { |
| Stop, |
| Continue, |
| } |
| |
| impl Compilation { |
| fn and_then<F: FnOnce() -> Compilation>(self, next: F) -> Compilation { |
| match self { |
| Compilation::Stop => Compilation::Stop, |
| Compilation::Continue => next(), |
| } |
| } |
| } |
| |
| fn handle_explain(handler: &EarlyErrorHandler, registry: Registry, code: &str, color: ColorConfig) { |
| let upper_cased_code = code.to_ascii_uppercase(); |
| let normalised = |
| if upper_cased_code.starts_with('E') { upper_cased_code } else { format!("E{code:0>4}") }; |
| match registry.try_find_description(&normalised) { |
| Ok(description) => { |
| let mut is_in_code_block = false; |
| let mut text = String::new(); |
| // Slice off the leading newline and print. |
| for line in description.lines() { |
| let indent_level = |
| line.find(|c: char| !c.is_whitespace()).unwrap_or_else(|| line.len()); |
| let dedented_line = &line[indent_level..]; |
| if dedented_line.starts_with("```") { |
| is_in_code_block = !is_in_code_block; |
| text.push_str(&line[..(indent_level + 3)]); |
| } else if is_in_code_block && dedented_line.starts_with("# ") { |
| continue; |
| } else { |
| text.push_str(line); |
| } |
| text.push('\n'); |
| } |
| if io::stdout().is_terminal() { |
| show_md_content_with_pager(&text, color); |
| } else { |
| safe_print!("{text}"); |
| } |
| } |
| Err(InvalidErrorCode) => { |
| handler.early_error(format!("{code} is not a valid error code")); |
| } |
| } |
| } |
| |
| /// If color is always or auto, print formatted & colorized markdown. If color is never or |
| /// if formatted printing fails, print the raw text. |
| /// |
| /// Prefers a pager, falls back standard print |
| fn show_md_content_with_pager(content: &str, color: ColorConfig) { |
| let mut fallback_to_println = false; |
| let pager_name = env::var_os("PAGER").unwrap_or_else(|| { |
| if cfg!(windows) { OsString::from("more.com") } else { OsString::from("less") } |
| }); |
| |
| let mut cmd = Command::new(&pager_name); |
| // FIXME: find if other pagers accept color options |
| let mut print_formatted = if pager_name == "less" { |
| cmd.arg("-r"); |
| true |
| } else if ["bat", "catbat", "delta"].iter().any(|v| *v == pager_name) { |
| true |
| } else { |
| false |
| }; |
| |
| if color == ColorConfig::Never { |
| print_formatted = false; |
| } else if color == ColorConfig::Always { |
| print_formatted = true; |
| } |
| |
| let mdstream = markdown::MdStream::parse_str(content); |
| let bufwtr = markdown::create_stdout_bufwtr(); |
| let mut mdbuf = bufwtr.buffer(); |
| if mdstream.write_termcolor_buf(&mut mdbuf).is_err() { |
| print_formatted = false; |
| } |
| |
| if let Ok(mut pager) = cmd.stdin(Stdio::piped()).spawn() { |
| if let Some(pipe) = pager.stdin.as_mut() { |
| let res = if print_formatted { |
| pipe.write_all(mdbuf.as_slice()) |
| } else { |
| pipe.write_all(content.as_bytes()) |
| }; |
| |
| if res.is_err() { |
| fallback_to_println = true; |
| } |
| } |
| |
| if pager.wait().is_err() { |
| fallback_to_println = true; |
| } |
| } else { |
| fallback_to_println = true; |
| } |
| |
| // If pager fails for whatever reason, we should still print the content |
| // to standard output |
| if fallback_to_println { |
| let fmt_success = match color { |
| ColorConfig::Auto => io::stdout().is_terminal() && bufwtr.print(&mdbuf).is_ok(), |
| ColorConfig::Always => bufwtr.print(&mdbuf).is_ok(), |
| ColorConfig::Never => false, |
| }; |
| |
| if !fmt_success { |
| safe_print!("{content}"); |
| } |
| } |
| } |
| |
| fn try_process_rlink(sess: &Session, compiler: &interface::Compiler) -> Compilation { |
| if sess.opts.unstable_opts.link_only { |
| if let Input::File(file) = &sess.io.input { |
| let outputs = compiler.build_output_filenames(sess, &[]); |
| let rlink_data = fs::read(file).unwrap_or_else(|err| { |
| sess.emit_fatal(RlinkUnableToRead { err }); |
| }); |
| let codegen_results = match CodegenResults::deserialize_rlink(sess, rlink_data) { |
| Ok(codegen) => codegen, |
| Err(err) => { |
| match err { |
| CodegenErrors::WrongFileType => sess.emit_fatal(RLinkWrongFileType), |
| CodegenErrors::EmptyVersionNumber => { |
| sess.emit_fatal(RLinkEmptyVersionNumber) |
| } |
| CodegenErrors::EncodingVersionMismatch { version_array, rlink_version } => { |
| sess.emit_fatal(RLinkEncodingVersionMismatch { |
| version_array, |
| rlink_version, |
| }) |
| } |
| CodegenErrors::RustcVersionMismatch { rustc_version } => { |
| sess.emit_fatal(RLinkRustcVersionMismatch { |
| rustc_version, |
| current_version: sess.cfg_version, |
| }) |
| } |
| }; |
| } |
| }; |
| let result = compiler.codegen_backend().link(sess, codegen_results, &outputs); |
| abort_on_err(result, sess); |
| } else { |
| sess.emit_fatal(RlinkNotAFile {}) |
| } |
| Compilation::Stop |
| } else { |
| Compilation::Continue |
| } |
| } |
| |
| fn list_metadata( |
| handler: &EarlyErrorHandler, |
| sess: &Session, |
| metadata_loader: &dyn MetadataLoader, |
| ) -> Compilation { |
| let ls_kinds = &sess.opts.unstable_opts.ls; |
| if !ls_kinds.is_empty() { |
| match sess.io.input { |
| Input::File(ref ifile) => { |
| let path = &(*ifile); |
| let mut v = Vec::new(); |
| locator::list_file_metadata(&sess.target, path, metadata_loader, &mut v, ls_kinds) |
| .unwrap(); |
| safe_println!("{}", String::from_utf8(v).unwrap()); |
| } |
| Input::Str { .. } => { |
| handler.early_error("cannot list metadata for stdin"); |
| } |
| } |
| return Compilation::Stop; |
| } |
| |
| Compilation::Continue |
| } |
| |
| fn print_crate_info( |
| handler: &EarlyErrorHandler, |
| codegen_backend: &dyn CodegenBackend, |
| sess: &Session, |
| parse_attrs: bool, |
| ) -> Compilation { |
| use rustc_session::config::PrintKind::*; |
| |
| // This import prevents the following code from using the printing macros |
| // used by the rest of the module. Within this function, we only write to |
| // the output specified by `sess.io.output_file`. |
| #[allow(unused_imports)] |
| use {do_not_use_safe_print as safe_print, do_not_use_safe_print as safe_println}; |
| |
| // NativeStaticLibs and LinkArgs are special - printed during linking |
| // (empty iterator returns true) |
| if sess.opts.prints.iter().all(|p| p.kind == NativeStaticLibs || p.kind == LinkArgs) { |
| return Compilation::Continue; |
| } |
| |
| let attrs = if parse_attrs { |
| let result = parse_crate_attrs(sess); |
| match result { |
| Ok(attrs) => Some(attrs), |
| Err(mut parse_error) => { |
| parse_error.emit(); |
| return Compilation::Stop; |
| } |
| } |
| } else { |
| None |
| }; |
| |
| for req in &sess.opts.prints { |
| let mut crate_info = String::new(); |
| macro println_info($($arg:tt)*) { |
| crate_info.write_fmt(format_args!("{}\n", format_args!($($arg)*))).unwrap() |
| } |
| |
| match req.kind { |
| TargetList => { |
| let mut targets = rustc_target::spec::TARGETS.to_vec(); |
| targets.sort_unstable(); |
| println_info!("{}", targets.join("\n")); |
| } |
| Sysroot => println_info!("{}", sess.sysroot.display()), |
| TargetLibdir => println_info!("{}", sess.target_tlib_path.dir.display()), |
| TargetSpec => { |
| println_info!("{}", serde_json::to_string_pretty(&sess.target.to_json()).unwrap()); |
| } |
| AllTargetSpecs => { |
| let mut targets = BTreeMap::new(); |
| for name in rustc_target::spec::TARGETS { |
| let triple = TargetTriple::from_triple(name); |
| let target = Target::expect_builtin(&triple); |
| targets.insert(name, target.to_json()); |
| } |
| println_info!("{}", serde_json::to_string_pretty(&targets).unwrap()); |
| } |
| FileNames => { |
| let Some(attrs) = attrs.as_ref() else { |
| // no crate attributes, print out an error and exit |
| return Compilation::Continue; |
| }; |
| let t_outputs = rustc_interface::util::build_output_filenames(attrs, sess); |
| let id = rustc_session::output::find_crate_name(sess, attrs); |
| let crate_types = collect_crate_types(sess, attrs); |
| for &style in &crate_types { |
| let fname = |
| rustc_session::output::filename_for_input(sess, style, id, &t_outputs); |
| println_info!("{}", fname.as_path().file_name().unwrap().to_string_lossy()); |
| } |
| } |
| CrateName => { |
| let Some(attrs) = attrs.as_ref() else { |
| // no crate attributes, print out an error and exit |
| return Compilation::Continue; |
| }; |
| let id = rustc_session::output::find_crate_name(sess, attrs); |
| println_info!("{id}"); |
| } |
| Cfg => { |
| let mut cfgs = sess |
| .parse_sess |
| .config |
| .iter() |
| .filter_map(|&(name, value)| { |
| // Note that crt-static is a specially recognized cfg |
| // directive that's printed out here as part of |
| // rust-lang/rust#37406, but in general the |
| // `target_feature` cfg is gated under |
| // rust-lang/rust#29717. For now this is just |
| // specifically allowing the crt-static cfg and that's |
| // it, this is intended to get into Cargo and then go |
| // through to build scripts. |
| if (name != sym::target_feature || value != Some(sym::crt_dash_static)) |
| && !sess.is_nightly_build() |
| && find_gated_cfg(|cfg_sym| cfg_sym == name).is_some() |
| { |
| return None; |
| } |
| |
| if let Some(value) = value { |
| Some(format!("{name}=\"{value}\"")) |
| } else { |
| Some(name.to_string()) |
| } |
| }) |
| .collect::<Vec<String>>(); |
| |
| cfgs.sort(); |
| for cfg in cfgs { |
| println_info!("{cfg}"); |
| } |
| } |
| CallingConventions => { |
| let mut calling_conventions = rustc_target::spec::abi::all_names(); |
| calling_conventions.sort_unstable(); |
| println_info!("{}", calling_conventions.join("\n")); |
| } |
| RelocationModels |
| | CodeModels |
| | TlsModels |
| | TargetCPUs |
| | StackProtectorStrategies |
| | TargetFeatures => { |
| codegen_backend.print(req, &mut crate_info, sess); |
| } |
| // Any output here interferes with Cargo's parsing of other printed output |
| NativeStaticLibs => {} |
| LinkArgs => {} |
| SplitDebuginfo => { |
| use rustc_target::spec::SplitDebuginfo::{Off, Packed, Unpacked}; |
| |
| for split in &[Off, Packed, Unpacked] { |
| if sess.target.options.supported_split_debuginfo.contains(split) { |
| println_info!("{split}"); |
| } |
| } |
| } |
| DeploymentTarget => { |
| use rustc_target::spec::current_apple_deployment_target; |
| |
| if sess.target.is_like_osx { |
| let (major, minor) = current_apple_deployment_target(&sess.target) |
| .expect("unknown Apple target OS"); |
| println_info!("deployment_target={}", format!("{major}.{minor}")) |
| } else { |
| handler |
| .early_error("only Apple targets currently support deployment version info") |
| } |
| } |
| } |
| |
| req.out.overwrite(&crate_info, sess); |
| } |
| Compilation::Stop |
| } |
| |
| /// Prints version information |
| /// |
| /// NOTE: this is a macro to support drivers built at a different time than the main `rustc_driver` crate. |
| pub macro version($handler: expr, $binary: literal, $matches: expr) { |
| fn unw(x: Option<&str>) -> &str { |
| x.unwrap_or("unknown") |
| } |
| $crate::version_at_macro_invocation( |
| $handler, |
| $binary, |
| $matches, |
| unw(option_env!("CFG_VERSION")), |
| unw(option_env!("CFG_VER_HASH")), |
| unw(option_env!("CFG_VER_DATE")), |
| unw(option_env!("CFG_RELEASE")), |
| ) |
| } |
| |
| #[doc(hidden)] // use the macro instead |
| pub fn version_at_macro_invocation( |
| handler: &EarlyErrorHandler, |
| binary: &str, |
| matches: &getopts::Matches, |
| version: &str, |
| commit_hash: &str, |
| commit_date: &str, |
| release: &str, |
| ) { |
| let verbose = matches.opt_present("verbose"); |
| |
| safe_println!("{binary} {version}"); |
| |
| if verbose { |
| safe_println!("binary: {binary}"); |
| safe_println!("commit-hash: {commit_hash}"); |
| safe_println!("commit-date: {commit_date}"); |
| safe_println!("host: {}", config::host_triple()); |
| safe_println!("release: {release}"); |
| |
| let debug_flags = matches.opt_strs("Z"); |
| let backend_name = debug_flags.iter().find_map(|x| x.strip_prefix("codegen-backend=")); |
| get_codegen_backend(handler, &None, backend_name).print_version(); |
| } |
| } |
| |
| fn usage(verbose: bool, include_unstable_options: bool, nightly_build: bool) { |
| let groups = if verbose { config::rustc_optgroups() } else { config::rustc_short_optgroups() }; |
| let mut options = getopts::Options::new(); |
| for option in groups.iter().filter(|x| include_unstable_options || x.is_stable()) { |
| (option.apply)(&mut options); |
| } |
| let message = "Usage: rustc [OPTIONS] INPUT"; |
| let nightly_help = if nightly_build { |
| "\n -Z help Print unstable compiler options" |
| } else { |
| "" |
| }; |
| let verbose_help = if verbose { |
| "" |
| } else { |
| "\n --help -v Print the full set of options rustc accepts" |
| }; |
| let at_path = if verbose { |
| " @path Read newline separated options from `path`\n" |
| } else { |
| "" |
| }; |
| safe_println!( |
| "{options}{at_path}\nAdditional help: |
| -C help Print codegen options |
| -W help \ |
| Print 'lint' options and default settings{nightly}{verbose}\n", |
| options = options.usage(message), |
| at_path = at_path, |
| nightly = nightly_help, |
| verbose = verbose_help |
| ); |
| } |
| |
| fn print_wall_help() { |
| safe_println!( |
| " |
| The flag `-Wall` does not exist in `rustc`. Most useful lints are enabled by |
| default. Use `rustc -W help` to see all available lints. It's more common to put |
| warning settings in the crate root using `#![warn(LINT_NAME)]` instead of using |
| the command line flag directly. |
| " |
| ); |
| } |
| |
| /// Write to stdout lint command options, together with a list of all available lints |
| pub fn describe_lints(sess: &Session) { |
| safe_println!( |
| " |
| Available lint options: |
| -W <foo> Warn about <foo> |
| -A <foo> Allow <foo> |
| -D <foo> Deny <foo> |
| -F <foo> Forbid <foo> (deny <foo> and all attempts to override) |
| |
| " |
| ); |
| |
| fn sort_lints(sess: &Session, mut lints: Vec<&'static Lint>) -> Vec<&'static Lint> { |
| // The sort doesn't case-fold but it's doubtful we care. |
| lints.sort_by_cached_key(|x: &&Lint| (x.default_level(sess.edition()), x.name)); |
| lints |
| } |
| |
| fn sort_lint_groups( |
| lints: Vec<(&'static str, Vec<LintId>, bool)>, |
| ) -> Vec<(&'static str, Vec<LintId>)> { |
| let mut lints: Vec<_> = lints.into_iter().map(|(x, y, _)| (x, y)).collect(); |
| lints.sort_by_key(|l| l.0); |
| lints |
| } |
| |
| let lint_store = unerased_lint_store(sess); |
| let (loaded, builtin): (Vec<_>, _) = |
| lint_store.get_lints().iter().cloned().partition(|&lint| lint.is_loaded); |
| let loaded = sort_lints(sess, loaded); |
| let builtin = sort_lints(sess, builtin); |
| |
| let (loaded_groups, builtin_groups): (Vec<_>, _) = |
| lint_store.get_lint_groups().partition(|&(.., p)| p); |
| let loaded_groups = sort_lint_groups(loaded_groups); |
| let builtin_groups = sort_lint_groups(builtin_groups); |
| |
| let max_name_len = |
| loaded.iter().chain(&builtin).map(|&s| s.name.chars().count()).max().unwrap_or(0); |
| let padded = |x: &str| { |
| let mut s = " ".repeat(max_name_len - x.chars().count()); |
| s.push_str(x); |
| s |
| }; |
| |
| safe_println!("Lint checks provided by rustc:\n"); |
| |
| let print_lints = |lints: Vec<&Lint>| { |
| safe_println!(" {} {:7.7} {}", padded("name"), "default", "meaning"); |
| safe_println!(" {} {:7.7} {}", padded("----"), "-------", "-------"); |
| for lint in lints { |
| let name = lint.name_lower().replace('_', "-"); |
| safe_println!( |
| " {} {:7.7} {}", |
| padded(&name), |
| lint.default_level(sess.edition()).as_str(), |
| lint.desc |
| ); |
| } |
| safe_println!("\n"); |
| }; |
| |
| print_lints(builtin); |
| |
| let max_name_len = max( |
| "warnings".len(), |
| loaded_groups |
| .iter() |
| .chain(&builtin_groups) |
| .map(|&(s, _)| s.chars().count()) |
| .max() |
| .unwrap_or(0), |
| ); |
| |
| let padded = |x: &str| { |
| let mut s = " ".repeat(max_name_len - x.chars().count()); |
| s.push_str(x); |
| s |
| }; |
| |
| safe_println!("Lint groups provided by rustc:\n"); |
| |
| let print_lint_groups = |lints: Vec<(&'static str, Vec<LintId>)>, all_warnings| { |
| safe_println!(" {} sub-lints", padded("name")); |
| safe_println!(" {} ---------", padded("----")); |
| |
| if all_warnings { |
| safe_println!(" {} all lints that are set to issue warnings", padded("warnings")); |
| } |
| |
| for (name, to) in lints { |
| let name = name.to_lowercase().replace('_', "-"); |
| let desc = to |
| .into_iter() |
| .map(|x| x.to_string().replace('_', "-")) |
| .collect::<Vec<String>>() |
| .join(", "); |
| safe_println!(" {} {}", padded(&name), desc); |
| } |
| safe_println!("\n"); |
| }; |
| |
| print_lint_groups(builtin_groups, true); |
| |
| match (sess.registered_lints, loaded.len(), loaded_groups.len()) { |
| (false, 0, _) | (false, _, 0) => { |
| safe_println!("Lint tools like Clippy can load additional lints and lint groups."); |
| } |
| (false, ..) => panic!("didn't load additional lints but got them anyway!"), |
| (true, 0, 0) => { |
| safe_println!("This crate does not load any additional lints or lint groups.") |
| } |
| (true, l, g) => { |
| if l > 0 { |
| safe_println!("Lint checks loaded by this crate:\n"); |
| print_lints(loaded); |
| } |
| if g > 0 { |
| safe_println!("Lint groups loaded by this crate:\n"); |
| print_lint_groups(loaded_groups, false); |
| } |
| } |
| } |
| } |
| |
| /// Show help for flag categories shared between rustdoc and rustc. |
| /// |
| /// Returns whether a help option was printed. |
| pub fn describe_flag_categories(handler: &EarlyErrorHandler, matches: &Matches) -> bool { |
| // Handle the special case of -Wall. |
| let wall = matches.opt_strs("W"); |
| if wall.iter().any(|x| *x == "all") { |
| print_wall_help(); |
| rustc_errors::FatalError.raise(); |
| } |
| |
| // Don't handle -W help here, because we might first load additional lints. |
| let debug_flags = matches.opt_strs("Z"); |
| if debug_flags.iter().any(|x| *x == "help") { |
| describe_debug_flags(); |
| return true; |
| } |
| |
| let cg_flags = matches.opt_strs("C"); |
| if cg_flags.iter().any(|x| *x == "help") { |
| describe_codegen_flags(); |
| return true; |
| } |
| |
| if cg_flags.iter().any(|x| *x == "no-stack-check") { |
| handler.early_warn("the --no-stack-check flag is deprecated and does nothing"); |
| } |
| |
| if cg_flags.iter().any(|x| *x == "passes=list") { |
| let backend_name = debug_flags.iter().find_map(|x| x.strip_prefix("codegen-backend=")); |
| get_codegen_backend(handler, &None, backend_name).print_passes(); |
| return true; |
| } |
| |
| false |
| } |
| |
| fn describe_debug_flags() { |
| safe_println!("\nAvailable options:\n"); |
| print_flag_list("-Z", config::Z_OPTIONS); |
| } |
| |
| fn describe_codegen_flags() { |
| safe_println!("\nAvailable codegen options:\n"); |
| print_flag_list("-C", config::CG_OPTIONS); |
| } |
| |
| fn print_flag_list<T>( |
| cmdline_opt: &str, |
| flag_list: &[(&'static str, T, &'static str, &'static str)], |
| ) { |
| let max_len = flag_list.iter().map(|&(name, _, _, _)| name.chars().count()).max().unwrap_or(0); |
| |
| for &(name, _, _, desc) in flag_list { |
| safe_println!( |
| " {} {:>width$}=val -- {}", |
| cmdline_opt, |
| name.replace('_', "-"), |
| desc, |
| width = max_len |
| ); |
| } |
| } |
| |
| /// Process command line options. Emits messages as appropriate. If compilation |
| /// should continue, returns a getopts::Matches object parsed from args, |
| /// otherwise returns `None`. |
| /// |
| /// The compiler's handling of options is a little complicated as it ties into |
| /// our stability story. The current intention of each compiler option is to |
| /// have one of two modes: |
| /// |
| /// 1. An option is stable and can be used everywhere. |
| /// 2. An option is unstable, and can only be used on nightly. |
| /// |
| /// Like unstable library and language features, however, unstable options have |
| /// always required a form of "opt in" to indicate that you're using them. This |
| /// provides the easy ability to scan a code base to check to see if anything |
| /// unstable is being used. Currently, this "opt in" is the `-Z` "zed" flag. |
| /// |
| /// All options behind `-Z` are considered unstable by default. Other top-level |
| /// options can also be considered unstable, and they were unlocked through the |
| /// `-Z unstable-options` flag. Note that `-Z` remains to be the root of |
| /// instability in both cases, though. |
| /// |
| /// So with all that in mind, the comments below have some more detail about the |
| /// contortions done here to get things to work out correctly. |
| /// |
| /// This does not need to be `pub` for rustc itself, but @chaosite needs it to |
| /// be public when using rustc as a library, see |
| /// <https://github.com/rust-lang/rust/commit/2b4c33817a5aaecabf4c6598d41e190080ec119e> |
| pub fn handle_options(handler: &EarlyErrorHandler, args: &[String]) -> Option<getopts::Matches> { |
| if args.is_empty() { |
| // user did not write `-v` nor `-Z unstable-options`, so do not |
| // include that extra information. |
| let nightly_build = |
| rustc_feature::UnstableFeatures::from_environment(None).is_nightly_build(); |
| usage(false, false, nightly_build); |
| return None; |
| } |
| |
| // Parse with *all* options defined in the compiler, we don't worry about |
| // option stability here we just want to parse as much as possible. |
| let mut options = getopts::Options::new(); |
| for option in config::rustc_optgroups() { |
| (option.apply)(&mut options); |
| } |
| let matches = options.parse(args).unwrap_or_else(|e| { |
| let msg = match e { |
| getopts::Fail::UnrecognizedOption(ref opt) => CG_OPTIONS |
| .iter() |
| .map(|&(name, ..)| ('C', name)) |
| .chain(Z_OPTIONS.iter().map(|&(name, ..)| ('Z', name))) |
| .find(|&(_, name)| *opt == name.replace('_', "-")) |
| .map(|(flag, _)| format!("{e}. Did you mean `-{flag} {opt}`?")), |
| _ => None, |
| }; |
| handler.early_error(msg.unwrap_or_else(|| e.to_string())); |
| }); |
| |
| // For all options we just parsed, we check a few aspects: |
| // |
| // * If the option is stable, we're all good |
| // * If the option wasn't passed, we're all good |
| // * If `-Z unstable-options` wasn't passed (and we're not a -Z option |
| // ourselves), then we require the `-Z unstable-options` flag to unlock |
| // this option that was passed. |
| // * If we're a nightly compiler, then unstable options are now unlocked, so |
| // we're good to go. |
| // * Otherwise, if we're an unstable option then we generate an error |
| // (unstable option being used on stable) |
| nightly_options::check_nightly_options(handler, &matches, &config::rustc_optgroups()); |
| |
| if matches.opt_present("h") || matches.opt_present("help") { |
| // Only show unstable options in --help if we accept unstable options. |
| let unstable_enabled = nightly_options::is_unstable_enabled(&matches); |
| let nightly_build = nightly_options::match_is_nightly_build(&matches); |
| usage(matches.opt_present("verbose"), unstable_enabled, nightly_build); |
| return None; |
| } |
| |
| if describe_flag_categories(handler, &matches) { |
| return None; |
| } |
| |
| if matches.opt_present("version") { |
| version!(handler, "rustc", &matches); |
| return None; |
| } |
| |
| Some(matches) |
| } |
| |
| fn parse_crate_attrs<'a>(sess: &'a Session) -> PResult<'a, ast::AttrVec> { |
| match &sess.io.input { |
| Input::File(ifile) => rustc_parse::parse_crate_attrs_from_file(ifile, &sess.parse_sess), |
| Input::Str { name, input } => rustc_parse::parse_crate_attrs_from_source_str( |
| name.clone(), |
| input.clone(), |
| &sess.parse_sess, |
| ), |
| } |
| } |
| |
| /// Runs a closure and catches unwinds triggered by fatal errors. |
| /// |
| /// The compiler currently unwinds with a special sentinel value to abort |
| /// compilation on fatal errors. This function catches that sentinel and turns |
| /// the panic into a `Result` instead. |
| pub fn catch_fatal_errors<F: FnOnce() -> R, R>(f: F) -> Result<R, ErrorGuaranteed> { |
| catch_unwind(panic::AssertUnwindSafe(f)).map_err(|value| { |
| if value.is::<rustc_errors::FatalErrorMarker>() { |
| #[allow(deprecated)] |
| ErrorGuaranteed::unchecked_claim_error_was_emitted() |
| } else { |
| panic::resume_unwind(value); |
| } |
| }) |
| } |
| |
| /// Variant of `catch_fatal_errors` for the `interface::Result` return type |
| /// that also computes the exit code. |
| pub fn catch_with_exit_code(f: impl FnOnce() -> interface::Result<()>) -> i32 { |
| let result = catch_fatal_errors(f).and_then(|result| result); |
| match result { |
| Ok(()) => EXIT_SUCCESS, |
| Err(_) => EXIT_FAILURE, |
| } |
| } |
| |
| static ICE_PATH: OnceLock<Option<PathBuf>> = OnceLock::new(); |
| |
| fn ice_path() -> &'static Option<PathBuf> { |
| ICE_PATH.get_or_init(|| { |
| if !rustc_feature::UnstableFeatures::from_environment(None).is_nightly_build() { |
| return None; |
| } |
| if let Some(s) = std::env::var_os("RUST_BACKTRACE") |
| && s == "0" |
| { |
| return None; |
| } |
| let mut path = match std::env::var_os("RUSTC_ICE") { |
| Some(s) => { |
| if s == "0" { |
| // Explicitly opting out of writing ICEs to disk. |
| return None; |
| } |
| PathBuf::from(s) |
| } |
| None => std::env::current_dir().unwrap_or_default(), |
| }; |
| let now: OffsetDateTime = SystemTime::now().into(); |
| let file_now = now |
| .format( |
| // Don't use a standard datetime format because Windows doesn't support `:` in paths |
| &time::format_description::parse("[year]-[month]-[day]T[hour]_[minute]_[second]") |
| .unwrap(), |
| ) |
| .unwrap_or_default(); |
| let pid = std::process::id(); |
| path.push(format!("rustc-ice-{file_now}-{pid}.txt")); |
| Some(path) |
| }) |
| } |
| |
| /// Installs a panic hook that will print the ICE message on unexpected panics. |
| /// |
| /// The hook is intended to be useable even by external tools. You can pass a custom |
| /// `bug_report_url`, or report arbitrary info in `extra_info`. Note that `extra_info` is called in |
| /// a context where *the thread is currently panicking*, so it must not panic or the process will |
| /// abort. |
| /// |
| /// If you have no extra info to report, pass the empty closure `|_| ()` as the argument to |
| /// extra_info. |
| /// |
| /// Returns a flag that can be set to disable the note for submitting a bug. This can be passed to |
| /// [`RunCompiler::set_using_internal_features`] to let macro expansion set it when encountering |
| /// internal features. |
| /// |
| /// A custom rustc driver can skip calling this to set up a custom ICE hook. |
| pub fn install_ice_hook(bug_report_url: &'static str, extra_info: fn(&Handler)) -> Arc<AtomicBool> { |
| // If the user has not explicitly overridden "RUST_BACKTRACE", then produce |
| // full backtraces. When a compiler ICE happens, we want to gather |
| // as much information as possible to present in the issue opened |
| // by the user. Compiler developers and other rustc users can |
| // opt in to less-verbose backtraces by manually setting "RUST_BACKTRACE" |
| // (e.g. `RUST_BACKTRACE=1`) |
| if std::env::var_os("RUST_BACKTRACE").is_none() { |
| std::env::set_var("RUST_BACKTRACE", "full"); |
| } |
| |
| let using_internal_features = Arc::new(std::sync::atomic::AtomicBool::default()); |
| let using_internal_features_hook = using_internal_features.clone(); |
| panic::update_hook(Box::new( |
| move |default_hook: &(dyn Fn(&PanicInfo<'_>) + Send + Sync + 'static), |
| info: &PanicInfo<'_>| { |
| // If the error was caused by a broken pipe then this is not a bug. |
| // Write the error and return immediately. See #98700. |
| #[cfg(windows)] |
| if let Some(msg) = info.payload().downcast_ref::<String>() { |
| if msg.starts_with("failed printing to stdout: ") && msg.ends_with("(os error 232)") |
| { |
| // the error code is already going to be reported when the panic unwinds up the stack |
| let handler = EarlyErrorHandler::new(ErrorOutputType::default()); |
| let _ = handler.early_error_no_abort(msg.clone()); |
| return; |
| } |
| }; |
| |
| // Invoke the default handler, which prints the actual panic message and optionally a backtrace |
| // Don't do this for delayed bugs, which already emit their own more useful backtrace. |
| if !info.payload().is::<rustc_errors::DelayedBugPanic>() { |
| default_hook(info); |
| // Separate the output with an empty line |
| eprintln!(); |
| |
| if let Some(ice_path) = ice_path() |
| && let Ok(mut out) = File::options().create(true).append(true).open(&ice_path) |
| { |
| // The current implementation always returns `Some`. |
| let location = info.location().unwrap(); |
| let msg = match info.payload().downcast_ref::<&'static str>() { |
| Some(s) => *s, |
| None => match info.payload().downcast_ref::<String>() { |
| Some(s) => &s[..], |
| None => "Box<dyn Any>", |
| }, |
| }; |
| let thread = std::thread::current(); |
| let name = thread.name().unwrap_or("<unnamed>"); |
| let _ = write!( |
| &mut out, |
| "thread '{name}' panicked at {location}:\n\ |
| {msg}\n\ |
| stack backtrace:\n\ |
| {:#}", |
| std::backtrace::Backtrace::force_capture() |
| ); |
| } |
| } |
| |
| // Print the ICE message |
| report_ice(info, bug_report_url, extra_info, &using_internal_features_hook); |
| }, |
| )); |
| |
| using_internal_features |
| } |
| |
| /// Prints the ICE message, including query stack, but without backtrace. |
| /// |
| /// The message will point the user at `bug_report_url` to report the ICE. |
| /// |
| /// When `install_ice_hook` is called, this function will be called as the panic |
| /// hook. |
| fn report_ice( |
| info: &panic::PanicInfo<'_>, |
| bug_report_url: &str, |
| extra_info: fn(&Handler), |
| using_internal_features: &AtomicBool, |
| ) { |
| let fallback_bundle = |
| rustc_errors::fallback_fluent_bundle(crate::DEFAULT_LOCALE_RESOURCES.to_vec(), false); |
| let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr( |
| rustc_errors::ColorConfig::Auto, |
| fallback_bundle, |
| )); |
| let handler = rustc_errors::Handler::with_emitter(emitter); |
| |
| // a .span_bug or .bug call has already printed what |
| // it wants to print. |
| if !info.payload().is::<rustc_errors::ExplicitBug>() |
| && !info.payload().is::<rustc_errors::DelayedBugPanic>() |
| { |
| handler.emit_err(session_diagnostics::Ice); |
| } |
| |
| if using_internal_features.load(std::sync::atomic::Ordering::Relaxed) { |
| handler.emit_note(session_diagnostics::IceBugReportInternalFeature); |
| } else { |
| handler.emit_note(session_diagnostics::IceBugReport { bug_report_url }); |
| } |
| |
| let version = util::version_str!().unwrap_or("unknown_version"); |
| let triple = config::host_triple(); |
| |
| static FIRST_PANIC: AtomicBool = AtomicBool::new(true); |
| |
| let file = if let Some(path) = ice_path() { |
| // Create the ICE dump target file. |
| match crate::fs::File::options().create(true).append(true).open(&path) { |
| Ok(mut file) => { |
| handler.emit_note(session_diagnostics::IcePath { path: path.clone() }); |
| if FIRST_PANIC.swap(false, Ordering::SeqCst) { |
| let _ = write!(file, "\n\nrustc version: {version}\nplatform: {triple}"); |
| } |
| Some(file) |
| } |
| Err(err) => { |
| // The path ICE couldn't be written to disk, provide feedback to the user as to why. |
| handler.emit_warning(session_diagnostics::IcePathError { |
| path: path.clone(), |
| error: err.to_string(), |
| env_var: std::env::var_os("RUSTC_ICE") |
| .map(PathBuf::from) |
| .map(|env_var| session_diagnostics::IcePathErrorEnv { env_var }), |
| }); |
| handler.emit_note(session_diagnostics::IceVersion { version, triple }); |
| None |
| } |
| } |
| } else { |
| handler.emit_note(session_diagnostics::IceVersion { version, triple }); |
| None |
| }; |
| |
| if let Some((flags, excluded_cargo_defaults)) = rustc_session::utils::extra_compiler_flags() { |
| handler.emit_note(session_diagnostics::IceFlags { flags: flags.join(" ") }); |
| if excluded_cargo_defaults { |
| handler.emit_note(session_diagnostics::IceExcludeCargoDefaults); |
| } |
| } |
| |
| // If backtraces are enabled, also print the query stack |
| let backtrace = env::var_os("RUST_BACKTRACE").is_some_and(|x| &x != "0"); |
| |
| let num_frames = if backtrace { None } else { Some(2) }; |
| |
| interface::try_print_query_stack(&handler, num_frames, file); |
| |
| // We don't trust this callback not to panic itself, so run it at the end after we're sure we've |
| // printed all the relevant info. |
| extra_info(&handler); |
| |
| #[cfg(windows)] |
| if env::var("RUSTC_BREAK_ON_ICE").is_ok() { |
| // Trigger a debugger if we crashed during bootstrap |
| unsafe { windows::Win32::System::Diagnostics::Debug::DebugBreak() }; |
| } |
| } |
| |
| /// This allows tools to enable rust logging without having to magically match rustc's |
| /// tracing crate version. |
| pub fn init_rustc_env_logger(handler: &EarlyErrorHandler) { |
| init_logger(handler, rustc_log::LoggerConfig::from_env("RUSTC_LOG")); |
| } |
| |
| /// This allows tools to enable rust logging without having to magically match rustc's |
| /// tracing crate version. In contrast to `init_rustc_env_logger` it allows you to choose |
| /// the values directly rather than having to set an environment variable. |
| pub fn init_logger(handler: &EarlyErrorHandler, cfg: rustc_log::LoggerConfig) { |
| if let Err(error) = rustc_log::init_logger(cfg) { |
| handler.early_error(error.to_string()); |
| } |
| } |
| |
| pub fn main() -> ! { |
| let start_time = Instant::now(); |
| let start_rss = get_resident_set_size(); |
| |
| let handler = EarlyErrorHandler::new(ErrorOutputType::default()); |
| |
| init_rustc_env_logger(&handler); |
| signal_handler::install(); |
| let mut callbacks = TimePassesCallbacks::default(); |
| let using_internal_features = install_ice_hook(DEFAULT_BUG_REPORT_URL, |_| ()); |
| let exit_code = catch_with_exit_code(|| { |
| let args = env::args_os() |
| .enumerate() |
| .map(|(i, arg)| { |
| arg.into_string().unwrap_or_else(|arg| { |
| handler.early_error(format!("argument {i} is not valid Unicode: {arg:?}")) |
| }) |
| }) |
| .collect::<Vec<_>>(); |
| RunCompiler::new(&args, &mut callbacks) |
| .set_using_internal_features(using_internal_features) |
| .run() |
| }); |
| |
| if let Some(format) = callbacks.time_passes { |
| let end_rss = get_resident_set_size(); |
| print_time_passes_entry("total", start_time.elapsed(), start_rss, end_rss, format); |
| } |
| |
| process::exit(exit_code) |
| } |
