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1337 lines
47 KiB
Rust
1337 lines
47 KiB
Rust
//! The Rust compiler.
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//!
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//! # Note
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//!
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//! This API is completely unstable and subject to change.
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#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
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#![feature(nll)]
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#![feature(once_cell)]
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#![recursion_limit = "256"]
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#[macro_use]
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extern crate tracing;
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pub extern crate rustc_plugin_impl as plugin;
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use rustc_ast as ast;
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use rustc_codegen_ssa::{traits::CodegenBackend, CodegenResults};
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use rustc_data_structures::profiling::print_time_passes_entry;
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use rustc_data_structures::sync::SeqCst;
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use rustc_errors::registry::{InvalidErrorCode, Registry};
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use rustc_errors::{ErrorReported, PResult};
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use rustc_feature::find_gated_cfg;
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use rustc_hir::def_id::LOCAL_CRATE;
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use rustc_interface::util::{self, collect_crate_types, get_builtin_codegen_backend};
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use rustc_interface::{interface, Queries};
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use rustc_lint::LintStore;
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use rustc_metadata::locator;
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use rustc_middle::middle::cstore::MetadataLoader;
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use rustc_middle::ty::TyCtxt;
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use rustc_save_analysis as save;
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use rustc_save_analysis::DumpHandler;
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use rustc_serialize::json::{self, ToJson};
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use rustc_session::config::nightly_options;
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use rustc_session::config::{ErrorOutputType, Input, OutputType, PrintRequest, TrimmedDefPaths};
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use rustc_session::getopts;
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use rustc_session::lint::{Lint, LintId};
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use rustc_session::{config, DiagnosticOutput, Session};
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use rustc_session::{early_error, early_warn};
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use rustc_span::source_map::{FileLoader, FileName};
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use rustc_span::symbol::sym;
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use std::borrow::Cow;
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use std::cmp::max;
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use std::default::Default;
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use std::env;
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use std::ffi::OsString;
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use std::fs;
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use std::io::{self, Read, Write};
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use std::lazy::SyncLazy;
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use std::mem;
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use std::panic::{self, catch_unwind};
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use std::path::PathBuf;
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use std::process::{self, Command, Stdio};
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use std::str;
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use std::time::Instant;
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mod args;
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pub mod pretty;
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/// Exit status code used for successful compilation and help output.
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pub const EXIT_SUCCESS: i32 = 0;
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/// Exit status code used for compilation failures and invalid flags.
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pub const EXIT_FAILURE: i32 = 1;
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const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust/issues/new\
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?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md";
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const ICE_REPORT_COMPILER_FLAGS: &[&str] = &["Z", "C", "crate-type"];
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const ICE_REPORT_COMPILER_FLAGS_EXCLUDE: &[&str] = &["metadata", "extra-filename"];
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const ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE: &[&str] = &["incremental"];
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pub fn abort_on_err<T>(result: Result<T, ErrorReported>, sess: &Session) -> T {
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match result {
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Err(..) => {
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sess.abort_if_errors();
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panic!("error reported but abort_if_errors didn't abort???");
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}
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Ok(x) => x,
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}
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}
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pub trait Callbacks {
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/// Called before creating the compiler instance
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fn config(&mut self, _config: &mut interface::Config) {}
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/// Called after parsing. Return value instructs the compiler whether to
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/// continue the compilation afterwards (defaults to `Compilation::Continue`)
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fn after_parsing<'tcx>(
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&mut self,
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_compiler: &interface::Compiler,
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_queries: &'tcx Queries<'tcx>,
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) -> Compilation {
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Compilation::Continue
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}
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/// Called after expansion. Return value instructs the compiler whether to
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/// continue the compilation afterwards (defaults to `Compilation::Continue`)
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fn after_expansion<'tcx>(
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&mut self,
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_compiler: &interface::Compiler,
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_queries: &'tcx Queries<'tcx>,
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) -> Compilation {
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Compilation::Continue
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}
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/// Called after analysis. Return value instructs the compiler whether to
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/// continue the compilation afterwards (defaults to `Compilation::Continue`)
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fn after_analysis<'tcx>(
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&mut self,
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_compiler: &interface::Compiler,
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_queries: &'tcx Queries<'tcx>,
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) -> Compilation {
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Compilation::Continue
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}
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}
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#[derive(Default)]
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pub struct TimePassesCallbacks {
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time_passes: bool,
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}
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impl Callbacks for TimePassesCallbacks {
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fn config(&mut self, config: &mut interface::Config) {
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// If a --prints=... option has been given, we don't print the "total"
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// time because it will mess up the --prints output. See #64339.
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self.time_passes = config.opts.prints.is_empty()
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&& (config.opts.debugging_opts.time_passes || config.opts.debugging_opts.time);
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config.opts.trimmed_def_paths = TrimmedDefPaths::GoodPath;
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}
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}
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pub fn diagnostics_registry() -> Registry {
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Registry::new(&rustc_error_codes::DIAGNOSTICS)
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}
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pub struct RunCompiler<'a, 'b> {
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at_args: &'a [String],
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callbacks: &'b mut (dyn Callbacks + Send),
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file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
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emitter: Option<Box<dyn Write + Send>>,
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make_codegen_backend:
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Option<Box<dyn FnOnce(&config::Options) -> Box<dyn CodegenBackend> + Send>>,
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}
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impl<'a, 'b> RunCompiler<'a, 'b> {
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pub fn new(at_args: &'a [String], callbacks: &'b mut (dyn Callbacks + Send)) -> Self {
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Self { at_args, callbacks, file_loader: None, emitter: None, make_codegen_backend: None }
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}
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pub fn set_make_codegen_backend(
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&mut self,
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make_codegen_backend: Option<
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Box<dyn FnOnce(&config::Options) -> Box<dyn CodegenBackend> + Send>,
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>,
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) -> &mut Self {
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self.make_codegen_backend = make_codegen_backend;
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self
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}
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pub fn set_emitter(&mut self, emitter: Option<Box<dyn Write + Send>>) -> &mut Self {
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self.emitter = emitter;
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self
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}
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pub fn set_file_loader(
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&mut self,
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file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
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) -> &mut Self {
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self.file_loader = file_loader;
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self
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}
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pub fn run(self) -> interface::Result<()> {
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run_compiler(
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self.at_args,
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self.callbacks,
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self.file_loader,
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self.emitter,
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self.make_codegen_backend,
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)
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}
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}
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// Parse args and run the compiler. This is the primary entry point for rustc.
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// The FileLoader provides a way to load files from sources other than the file system.
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fn run_compiler(
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at_args: &[String],
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callbacks: &mut (dyn Callbacks + Send),
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file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
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emitter: Option<Box<dyn Write + Send>>,
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make_codegen_backend: Option<
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Box<dyn FnOnce(&config::Options) -> Box<dyn CodegenBackend> + Send>,
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>,
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) -> interface::Result<()> {
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let mut args = Vec::new();
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for arg in at_args {
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match args::arg_expand(arg.clone()) {
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Ok(arg) => args.extend(arg),
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Err(err) => early_error(
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ErrorOutputType::default(),
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&format!("Failed to load argument file: {}", err),
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),
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}
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}
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let diagnostic_output = emitter.map_or(DiagnosticOutput::Default, DiagnosticOutput::Raw);
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let matches = match handle_options(&args) {
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Some(matches) => matches,
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None => return Ok(()),
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};
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let sopts = config::build_session_options(&matches);
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let cfg = interface::parse_cfgspecs(matches.opt_strs("cfg"));
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// We wrap `make_codegen_backend` in another `Option` such that `dummy_config` can take
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// ownership of it when necessary, while also allowing the non-dummy config to take ownership
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// when `dummy_config` is not used.
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let mut make_codegen_backend = Some(make_codegen_backend);
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let mut dummy_config = |sopts, cfg, diagnostic_output| {
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let mut config = interface::Config {
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opts: sopts,
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crate_cfg: cfg,
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input: Input::File(PathBuf::new()),
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input_path: None,
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output_file: None,
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output_dir: None,
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file_loader: None,
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diagnostic_output,
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stderr: None,
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lint_caps: Default::default(),
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register_lints: None,
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override_queries: None,
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make_codegen_backend: make_codegen_backend.take().unwrap(),
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registry: diagnostics_registry(),
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};
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callbacks.config(&mut config);
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config
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};
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if let Some(ref code) = matches.opt_str("explain") {
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handle_explain(diagnostics_registry(), code, sopts.error_format);
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return Ok(());
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}
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let (odir, ofile) = make_output(&matches);
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let (input, input_file_path, input_err) = match make_input(&matches.free) {
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Some(v) => v,
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None => match matches.free.len() {
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0 => {
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let config = dummy_config(sopts, cfg, diagnostic_output);
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interface::run_compiler(config, |compiler| {
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let sopts = &compiler.session().opts;
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if sopts.describe_lints {
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let mut lint_store = rustc_lint::new_lint_store(
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sopts.debugging_opts.no_interleave_lints,
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compiler.session().unstable_options(),
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);
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let registered_lints =
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if let Some(register_lints) = compiler.register_lints() {
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register_lints(compiler.session(), &mut lint_store);
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true
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} else {
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false
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};
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describe_lints(compiler.session(), &lint_store, registered_lints);
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return;
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}
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let should_stop = RustcDefaultCalls::print_crate_info(
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&***compiler.codegen_backend(),
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compiler.session(),
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None,
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&odir,
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&ofile,
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);
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if should_stop == Compilation::Stop {
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return;
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}
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early_error(sopts.error_format, "no input filename given")
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});
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return Ok(());
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}
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1 => panic!("make_input should have provided valid inputs"),
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_ => early_error(
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sopts.error_format,
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&format!(
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"multiple input filenames provided (first two filenames are `{}` and `{}`)",
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matches.free[0], matches.free[1],
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),
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),
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},
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};
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if let Some(err) = input_err {
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// Immediately stop compilation if there was an issue reading
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// the input (for example if the input stream is not UTF-8).
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interface::run_compiler(dummy_config(sopts, cfg, diagnostic_output), |compiler| {
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compiler.session().err(&err.to_string());
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});
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return Err(ErrorReported);
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}
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let mut config = interface::Config {
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opts: sopts,
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crate_cfg: cfg,
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input,
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input_path: input_file_path,
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output_file: ofile,
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output_dir: odir,
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file_loader,
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diagnostic_output,
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stderr: None,
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lint_caps: Default::default(),
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register_lints: None,
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override_queries: None,
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make_codegen_backend: make_codegen_backend.unwrap(),
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registry: diagnostics_registry(),
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};
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callbacks.config(&mut config);
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interface::run_compiler(config, |compiler| {
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let sess = compiler.session();
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let should_stop = RustcDefaultCalls::print_crate_info(
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&***compiler.codegen_backend(),
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sess,
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Some(compiler.input()),
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compiler.output_dir(),
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compiler.output_file(),
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)
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.and_then(|| {
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RustcDefaultCalls::list_metadata(
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sess,
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&*compiler.codegen_backend().metadata_loader(),
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&matches,
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compiler.input(),
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)
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})
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.and_then(|| RustcDefaultCalls::try_process_rlink(sess, compiler));
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if should_stop == Compilation::Stop {
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return sess.compile_status();
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}
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let linker = compiler.enter(|queries| {
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let early_exit = || sess.compile_status().map(|_| None);
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queries.parse()?;
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if let Some(ppm) = &sess.opts.pretty {
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if ppm.needs_ast_map() {
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queries.global_ctxt()?.peek_mut().enter(|tcx| {
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let expanded_crate = queries.expansion()?.take().0;
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pretty::print_after_hir_lowering(
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tcx,
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compiler.input(),
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&expanded_crate,
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*ppm,
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compiler.output_file().as_ref().map(|p| &**p),
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);
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Ok(())
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})?;
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} else {
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let krate = queries.parse()?.take();
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pretty::print_after_parsing(
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sess,
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&compiler.input(),
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&krate,
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*ppm,
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compiler.output_file().as_ref().map(|p| &**p),
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);
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}
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trace!("finished pretty-printing");
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return early_exit();
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}
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if callbacks.after_parsing(compiler, queries) == Compilation::Stop {
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return early_exit();
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}
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if sess.opts.debugging_opts.parse_only
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|| sess.opts.debugging_opts.show_span.is_some()
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|| sess.opts.debugging_opts.ast_json_noexpand
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{
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return early_exit();
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}
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{
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let (_, lint_store) = &*queries.register_plugins()?.peek();
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// Lint plugins are registered; now we can process command line flags.
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if sess.opts.describe_lints {
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describe_lints(&sess, &lint_store, true);
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return early_exit();
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}
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}
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queries.expansion()?;
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if callbacks.after_expansion(compiler, queries) == Compilation::Stop {
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return early_exit();
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}
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queries.prepare_outputs()?;
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if sess.opts.output_types.contains_key(&OutputType::DepInfo)
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&& sess.opts.output_types.len() == 1
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{
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return early_exit();
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}
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queries.global_ctxt()?;
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// Drop AST after creating GlobalCtxt to free memory
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{
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let _timer = sess.prof.generic_activity("drop_ast");
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mem::drop(queries.expansion()?.take());
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}
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if sess.opts.debugging_opts.no_analysis || sess.opts.debugging_opts.ast_json {
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return early_exit();
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}
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if sess.opts.debugging_opts.save_analysis {
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let crate_name = queries.crate_name()?.peek().clone();
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queries.global_ctxt()?.peek_mut().enter(|tcx| {
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let result = tcx.analysis(LOCAL_CRATE);
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sess.time("save_analysis", || {
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save::process_crate(
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tcx,
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&crate_name,
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&compiler.input(),
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None,
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DumpHandler::new(
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compiler.output_dir().as_ref().map(|p| &**p),
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&crate_name,
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),
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)
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});
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|
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result
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})?;
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}
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|
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queries.global_ctxt()?.peek_mut().enter(|tcx| tcx.analysis(LOCAL_CRATE))?;
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|
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if callbacks.after_analysis(compiler, queries) == Compilation::Stop {
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return early_exit();
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}
|
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|
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queries.ongoing_codegen()?;
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|
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if sess.opts.debugging_opts.print_type_sizes {
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sess.code_stats.print_type_sizes();
|
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}
|
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|
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let linker = queries.linker()?;
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Ok(Some(linker))
|
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})?;
|
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|
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if let Some(linker) = linker {
|
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let _timer = sess.timer("link");
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linker.link()?
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}
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|
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if sess.opts.debugging_opts.perf_stats {
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sess.print_perf_stats();
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}
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|
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if sess.print_fuel_crate.is_some() {
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eprintln!(
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"Fuel used by {}: {}",
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sess.print_fuel_crate.as_ref().unwrap(),
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sess.print_fuel.load(SeqCst)
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);
|
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}
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|
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Ok(())
|
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})
|
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}
|
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|
|
#[cfg(unix)]
|
|
pub fn set_sigpipe_handler() {
|
|
unsafe {
|
|
// Set the SIGPIPE signal handler, so that an EPIPE
|
|
// will cause rustc to terminate, as expected.
|
|
assert_ne!(libc::signal(libc::SIGPIPE, libc::SIG_DFL), libc::SIG_ERR);
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}
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}
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|
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#[cfg(windows)]
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pub fn set_sigpipe_handler() {}
|
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|
|
// Extract output directory and file from matches.
|
|
fn make_output(matches: &getopts::Matches) -> (Option<PathBuf>, Option<PathBuf>) {
|
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let odir = matches.opt_str("out-dir").map(|o| PathBuf::from(&o));
|
|
let ofile = matches.opt_str("o").map(|o| PathBuf::from(&o));
|
|
(odir, ofile)
|
|
}
|
|
|
|
// Extract input (string or file and optional path) from matches.
|
|
fn make_input(free_matches: &[String]) -> Option<(Input, Option<PathBuf>, Option<io::Error>)> {
|
|
if free_matches.len() == 1 {
|
|
let ifile = &free_matches[0];
|
|
if ifile == "-" {
|
|
let mut src = String::new();
|
|
let err = if io::stdin().read_to_string(&mut src).is_err() {
|
|
Some(io::Error::new(
|
|
io::ErrorKind::InvalidData,
|
|
"couldn't read from stdin, as it did not contain valid UTF-8",
|
|
))
|
|
} else {
|
|
None
|
|
};
|
|
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);
|
|
return Some((Input::Str { name: file_name, input: src }, None, err));
|
|
}
|
|
Some((Input::Str { name: FileName::anon_source_code(&src), input: src }, None, err))
|
|
} else {
|
|
Some((Input::File(PathBuf::from(ifile)), Some(PathBuf::from(ifile)), None))
|
|
}
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
|
|
// Whether to stop or continue compilation.
|
|
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
|
|
pub enum Compilation {
|
|
Stop,
|
|
Continue,
|
|
}
|
|
|
|
impl Compilation {
|
|
pub fn and_then<F: FnOnce() -> Compilation>(self, next: F) -> Compilation {
|
|
match self {
|
|
Compilation::Stop => Compilation::Stop,
|
|
Compilation::Continue => next(),
|
|
}
|
|
}
|
|
}
|
|
|
|
/// CompilerCalls instance for a regular rustc build.
|
|
#[derive(Copy, Clone)]
|
|
pub struct RustcDefaultCalls;
|
|
|
|
fn stdout_isatty() -> bool {
|
|
atty::is(atty::Stream::Stdout)
|
|
}
|
|
|
|
fn stderr_isatty() -> bool {
|
|
atty::is(atty::Stream::Stderr)
|
|
}
|
|
|
|
fn handle_explain(registry: Registry, code: &str, output: ErrorOutputType) {
|
|
let normalised =
|
|
if code.starts_with('E') { code.to_string() } else { format!("E{0:0>4}", code) };
|
|
match registry.try_find_description(&normalised) {
|
|
Ok(Some(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 stdout_isatty() {
|
|
show_content_with_pager(&text);
|
|
} else {
|
|
print!("{}", text);
|
|
}
|
|
}
|
|
Ok(None) => {
|
|
early_error(output, &format!("no extended information for {}", code));
|
|
}
|
|
Err(InvalidErrorCode) => {
|
|
early_error(output, &format!("{} is not a valid error code", code));
|
|
}
|
|
}
|
|
}
|
|
|
|
fn show_content_with_pager(content: &str) {
|
|
let pager_name = env::var_os("PAGER").unwrap_or_else(|| {
|
|
if cfg!(windows) { OsString::from("more.com") } else { OsString::from("less") }
|
|
});
|
|
|
|
let mut fallback_to_println = false;
|
|
|
|
match Command::new(pager_name).stdin(Stdio::piped()).spawn() {
|
|
Ok(mut pager) => {
|
|
if let Some(pipe) = pager.stdin.as_mut() {
|
|
if pipe.write_all(content.as_bytes()).is_err() {
|
|
fallback_to_println = true;
|
|
}
|
|
}
|
|
|
|
if pager.wait().is_err() {
|
|
fallback_to_println = true;
|
|
}
|
|
}
|
|
Err(_) => {
|
|
fallback_to_println = true;
|
|
}
|
|
}
|
|
|
|
// If pager fails for whatever reason, we should still print the content
|
|
// to standard output
|
|
if fallback_to_println {
|
|
print!("{}", content);
|
|
}
|
|
}
|
|
|
|
impl RustcDefaultCalls {
|
|
fn process_rlink(sess: &Session, compiler: &interface::Compiler) -> Result<(), ErrorReported> {
|
|
if let Input::File(file) = compiler.input() {
|
|
// FIXME: #![crate_type] and #![crate_name] support not implemented yet
|
|
let attrs = vec![];
|
|
sess.init_crate_types(collect_crate_types(sess, &attrs));
|
|
let outputs = compiler.build_output_filenames(&sess, &attrs);
|
|
let rlink_data = fs::read_to_string(file).unwrap_or_else(|err| {
|
|
sess.fatal(&format!("failed to read rlink file: {}", err));
|
|
});
|
|
let codegen_results: CodegenResults = json::decode(&rlink_data).unwrap_or_else(|err| {
|
|
sess.fatal(&format!("failed to decode rlink: {}", err));
|
|
});
|
|
compiler.codegen_backend().link(&sess, codegen_results, &outputs)
|
|
} else {
|
|
sess.fatal("rlink must be a file")
|
|
}
|
|
}
|
|
|
|
pub fn try_process_rlink(sess: &Session, compiler: &interface::Compiler) -> Compilation {
|
|
if sess.opts.debugging_opts.link_only {
|
|
let result = RustcDefaultCalls::process_rlink(sess, compiler);
|
|
abort_on_err(result, sess);
|
|
Compilation::Stop
|
|
} else {
|
|
Compilation::Continue
|
|
}
|
|
}
|
|
|
|
pub fn list_metadata(
|
|
sess: &Session,
|
|
metadata_loader: &dyn MetadataLoader,
|
|
matches: &getopts::Matches,
|
|
input: &Input,
|
|
) -> Compilation {
|
|
let r = matches.opt_strs("Z");
|
|
if r.iter().any(|s| *s == "ls") {
|
|
match *input {
|
|
Input::File(ref ifile) => {
|
|
let path = &(*ifile);
|
|
let mut v = Vec::new();
|
|
locator::list_file_metadata(&sess.target, path, metadata_loader, &mut v)
|
|
.unwrap();
|
|
println!("{}", String::from_utf8(v).unwrap());
|
|
}
|
|
Input::Str { .. } => {
|
|
early_error(ErrorOutputType::default(), "cannot list metadata for stdin");
|
|
}
|
|
}
|
|
return Compilation::Stop;
|
|
}
|
|
|
|
Compilation::Continue
|
|
}
|
|
|
|
fn print_crate_info(
|
|
codegen_backend: &dyn CodegenBackend,
|
|
sess: &Session,
|
|
input: Option<&Input>,
|
|
odir: &Option<PathBuf>,
|
|
ofile: &Option<PathBuf>,
|
|
) -> Compilation {
|
|
use rustc_session::config::PrintRequest::*;
|
|
// PrintRequest::NativeStaticLibs is special - printed during linking
|
|
// (empty iterator returns true)
|
|
if sess.opts.prints.iter().all(|&p| p == PrintRequest::NativeStaticLibs) {
|
|
return Compilation::Continue;
|
|
}
|
|
|
|
let attrs = match input {
|
|
None => None,
|
|
Some(input) => {
|
|
let result = parse_crate_attrs(sess, input);
|
|
match result {
|
|
Ok(attrs) => Some(attrs),
|
|
Err(mut parse_error) => {
|
|
parse_error.emit();
|
|
return Compilation::Stop;
|
|
}
|
|
}
|
|
}
|
|
};
|
|
for req in &sess.opts.prints {
|
|
match *req {
|
|
TargetList => {
|
|
let mut targets =
|
|
rustc_target::spec::TARGETS.iter().copied().collect::<Vec<_>>();
|
|
targets.sort_unstable();
|
|
println!("{}", targets.join("\n"));
|
|
}
|
|
Sysroot => println!("{}", sess.sysroot.display()),
|
|
TargetLibdir => println!(
|
|
"{}",
|
|
sess.target_tlib_path.as_ref().unwrap_or(&sess.host_tlib_path).dir.display()
|
|
),
|
|
TargetSpec => println!("{}", sess.target.to_json().pretty()),
|
|
FileNames | CrateName => {
|
|
let input = input.unwrap_or_else(|| {
|
|
early_error(ErrorOutputType::default(), "no input file provided")
|
|
});
|
|
let attrs = attrs.as_ref().unwrap();
|
|
let t_outputs = rustc_interface::util::build_output_filenames(
|
|
input, odir, ofile, attrs, sess,
|
|
);
|
|
let id = rustc_session::output::find_crate_name(sess, attrs, input);
|
|
if *req == PrintRequest::CrateName {
|
|
println!("{}", id);
|
|
continue;
|
|
}
|
|
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!("{}", fname.file_name().unwrap().to_string_lossy());
|
|
}
|
|
}
|
|
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!("{}", cfg);
|
|
}
|
|
}
|
|
RelocationModels | CodeModels | TlsModels | TargetCPUs | TargetFeatures => {
|
|
codegen_backend.print(*req, sess);
|
|
}
|
|
// Any output here interferes with Cargo's parsing of other printed output
|
|
PrintRequest::NativeStaticLibs => {}
|
|
}
|
|
}
|
|
Compilation::Stop
|
|
}
|
|
}
|
|
|
|
/// Prints version information
|
|
pub fn version(binary: &str, matches: &getopts::Matches) {
|
|
let verbose = matches.opt_present("verbose");
|
|
|
|
println!("{} {}", binary, util::version_str().unwrap_or("unknown version"));
|
|
|
|
if verbose {
|
|
fn unw(x: Option<&str>) -> &str {
|
|
x.unwrap_or("unknown")
|
|
}
|
|
println!("binary: {}", binary);
|
|
println!("commit-hash: {}", unw(util::commit_hash_str()));
|
|
println!("commit-date: {}", unw(util::commit_date_str()));
|
|
println!("host: {}", config::host_triple());
|
|
println!("release: {}", unw(util::release_str()));
|
|
if cfg!(feature = "llvm") {
|
|
get_builtin_codegen_backend(&None, "llvm")().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 && nightly_build {
|
|
" @path Read newline separated options from `path`\n"
|
|
} else {
|
|
""
|
|
};
|
|
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() {
|
|
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.
|
|
"
|
|
);
|
|
}
|
|
|
|
fn describe_lints(sess: &Session, lint_store: &LintStore, loaded_plugins: bool) {
|
|
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 (plugin, builtin): (Vec<_>, _) =
|
|
lint_store.get_lints().iter().cloned().partition(|&lint| lint.is_plugin);
|
|
let plugin = sort_lints(sess, plugin);
|
|
let builtin = sort_lints(sess, builtin);
|
|
|
|
let (plugin_groups, builtin_groups): (Vec<_>, _) =
|
|
lint_store.get_lint_groups().iter().cloned().partition(|&(.., p)| p);
|
|
let plugin_groups = sort_lint_groups(plugin_groups);
|
|
let builtin_groups = sort_lint_groups(builtin_groups);
|
|
|
|
let max_name_len =
|
|
plugin.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
|
|
};
|
|
|
|
println!("Lint checks provided by rustc:\n");
|
|
println!(" {} {:7.7} {}", padded("name"), "default", "meaning");
|
|
println!(" {} {:7.7} {}", padded("----"), "-------", "-------");
|
|
|
|
let print_lints = |lints: Vec<&Lint>| {
|
|
for lint in lints {
|
|
let name = lint.name_lower().replace("_", "-");
|
|
println!(" {} {:7.7} {}", padded(&name), lint.default_level.as_str(), lint.desc);
|
|
}
|
|
println!("\n");
|
|
};
|
|
|
|
print_lints(builtin);
|
|
|
|
let max_name_len = max(
|
|
"warnings".len(),
|
|
plugin_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
|
|
};
|
|
|
|
println!("Lint groups provided by rustc:\n");
|
|
println!(" {} {}", padded("name"), "sub-lints");
|
|
println!(" {} {}", padded("----"), "---------");
|
|
println!(" {} {}", padded("warnings"), "all lints that are set to issue warnings");
|
|
|
|
let print_lint_groups = |lints: Vec<(&'static str, Vec<LintId>)>| {
|
|
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(", ");
|
|
println!(" {} {}", padded(&name), desc);
|
|
}
|
|
println!("\n");
|
|
};
|
|
|
|
print_lint_groups(builtin_groups);
|
|
|
|
match (loaded_plugins, plugin.len(), plugin_groups.len()) {
|
|
(false, 0, _) | (false, _, 0) => {
|
|
println!("Lint tools like Clippy can provide additional lints and lint groups.");
|
|
}
|
|
(false, ..) => panic!("didn't load lint plugins but got them anyway!"),
|
|
(true, 0, 0) => println!("This crate does not load any lint plugins or lint groups."),
|
|
(true, l, g) => {
|
|
if l > 0 {
|
|
println!("Lint checks provided by plugins loaded by this crate:\n");
|
|
print_lints(plugin);
|
|
}
|
|
if g > 0 {
|
|
println!("Lint groups provided by plugins loaded by this crate:\n");
|
|
print_lint_groups(plugin_groups);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn describe_debug_flags() {
|
|
println!("\nAvailable options:\n");
|
|
print_flag_list("-Z", config::DB_OPTIONS);
|
|
}
|
|
|
|
fn describe_codegen_flags() {
|
|
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 {
|
|
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.
|
|
pub fn handle_options(args: &[String]) -> Option<getopts::Matches> {
|
|
// Throw away the first argument, the name of the binary
|
|
let args = &args[1..];
|
|
|
|
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(|f| early_error(ErrorOutputType::default(), &f.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(&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;
|
|
}
|
|
|
|
// Handle the special case of -Wall.
|
|
let wall = matches.opt_strs("W");
|
|
if wall.iter().any(|x| *x == "all") {
|
|
print_wall_help();
|
|
return None;
|
|
}
|
|
|
|
// Don't handle -W help here, because we might first load plugins.
|
|
let r = matches.opt_strs("Z");
|
|
if r.iter().any(|x| *x == "help") {
|
|
describe_debug_flags();
|
|
return None;
|
|
}
|
|
|
|
let cg_flags = matches.opt_strs("C");
|
|
|
|
if cg_flags.iter().any(|x| *x == "help") {
|
|
describe_codegen_flags();
|
|
return None;
|
|
}
|
|
|
|
if cg_flags.iter().any(|x| *x == "no-stack-check") {
|
|
early_warn(
|
|
ErrorOutputType::default(),
|
|
"the --no-stack-check flag is deprecated and does nothing",
|
|
);
|
|
}
|
|
|
|
if cg_flags.iter().any(|x| *x == "passes=list") {
|
|
if cfg!(feature = "llvm") {
|
|
get_builtin_codegen_backend(&None, "llvm")().print_passes();
|
|
}
|
|
return None;
|
|
}
|
|
|
|
if matches.opt_present("version") {
|
|
version("rustc", &matches);
|
|
return None;
|
|
}
|
|
|
|
Some(matches)
|
|
}
|
|
|
|
fn parse_crate_attrs<'a>(sess: &'a Session, input: &Input) -> PResult<'a, Vec<ast::Attribute>> {
|
|
match 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,
|
|
),
|
|
}
|
|
}
|
|
|
|
/// Gets a list of extra command-line flags provided by the user, as strings.
|
|
///
|
|
/// This function is used during ICEs to show more information useful for
|
|
/// debugging, since some ICEs only happens with non-default compiler flags
|
|
/// (and the users don't always report them).
|
|
fn extra_compiler_flags() -> Option<(Vec<String>, bool)> {
|
|
let args = env::args_os().map(|arg| arg.to_string_lossy().to_string()).collect::<Vec<_>>();
|
|
|
|
// Avoid printing help because of empty args. This can suggest the compiler
|
|
// itself is not the program root (consider RLS).
|
|
if args.len() < 2 {
|
|
return None;
|
|
}
|
|
|
|
let matches = handle_options(&args)?;
|
|
let mut result = Vec::new();
|
|
let mut excluded_cargo_defaults = false;
|
|
for flag in ICE_REPORT_COMPILER_FLAGS {
|
|
let prefix = if flag.len() == 1 { "-" } else { "--" };
|
|
|
|
for content in &matches.opt_strs(flag) {
|
|
// Split always returns the first element
|
|
let name = if let Some(first) = content.split('=').next() { first } else { &content };
|
|
|
|
let content =
|
|
if ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE.contains(&name) { name } else { content };
|
|
|
|
if !ICE_REPORT_COMPILER_FLAGS_EXCLUDE.contains(&name) {
|
|
result.push(format!("{}{} {}", prefix, flag, content));
|
|
} else {
|
|
excluded_cargo_defaults = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if !result.is_empty() { Some((result, excluded_cargo_defaults)) } else { None }
|
|
}
|
|
|
|
/// 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, ErrorReported> {
|
|
catch_unwind(panic::AssertUnwindSafe(f)).map_err(|value| {
|
|
if value.is::<rustc_errors::FatalErrorMarker>() {
|
|
ErrorReported
|
|
} 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 DEFAULT_HOOK: SyncLazy<Box<dyn Fn(&panic::PanicInfo<'_>) + Sync + Send + 'static>> =
|
|
SyncLazy::new(|| {
|
|
let hook = panic::take_hook();
|
|
panic::set_hook(Box::new(|info| report_ice(info, BUG_REPORT_URL)));
|
|
hook
|
|
});
|
|
|
|
/// Prints the ICE message, including backtrace and query stack.
|
|
///
|
|
/// 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.
|
|
pub fn report_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
|
|
// Invoke the default handler, which prints the actual panic message and optionally a backtrace
|
|
(*DEFAULT_HOOK)(info);
|
|
|
|
// Separate the output with an empty line
|
|
eprintln!();
|
|
|
|
let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
|
|
rustc_errors::ColorConfig::Auto,
|
|
None,
|
|
false,
|
|
false,
|
|
None,
|
|
false,
|
|
));
|
|
let handler = rustc_errors::Handler::with_emitter(true, None, emitter);
|
|
|
|
// a .span_bug or .bug call has already printed what
|
|
// it wants to print.
|
|
if !info.payload().is::<rustc_errors::ExplicitBug>() {
|
|
let d = rustc_errors::Diagnostic::new(rustc_errors::Level::Bug, "unexpected panic");
|
|
handler.emit_diagnostic(&d);
|
|
}
|
|
|
|
let mut xs: Vec<Cow<'static, str>> = vec![
|
|
"the compiler unexpectedly panicked. this is a bug.".into(),
|
|
format!("we would appreciate a bug report: {}", bug_report_url).into(),
|
|
format!(
|
|
"rustc {} running on {}",
|
|
util::version_str().unwrap_or("unknown_version"),
|
|
config::host_triple()
|
|
)
|
|
.into(),
|
|
];
|
|
|
|
if let Some((flags, excluded_cargo_defaults)) = extra_compiler_flags() {
|
|
xs.push(format!("compiler flags: {}", flags.join(" ")).into());
|
|
|
|
if excluded_cargo_defaults {
|
|
xs.push("some of the compiler flags provided by cargo are hidden".into());
|
|
}
|
|
}
|
|
|
|
for note in &xs {
|
|
handler.note_without_error(¬e);
|
|
}
|
|
|
|
// If backtraces are enabled, also print the query stack
|
|
let backtrace = env::var_os("RUST_BACKTRACE").map_or(false, |x| &x != "0");
|
|
|
|
let num_frames = if backtrace { None } else { Some(2) };
|
|
|
|
TyCtxt::try_print_query_stack(&handler, num_frames);
|
|
|
|
#[cfg(windows)]
|
|
unsafe {
|
|
if env::var("RUSTC_BREAK_ON_ICE").is_ok() {
|
|
// Trigger a debugger if we crashed during bootstrap
|
|
winapi::um::debugapi::DebugBreak();
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Installs a panic hook that will print the ICE message on unexpected panics.
|
|
///
|
|
/// A custom rustc driver can skip calling this to set up a custom ICE hook.
|
|
pub fn install_ice_hook() {
|
|
SyncLazy::force(&DEFAULT_HOOK);
|
|
}
|
|
|
|
/// This allows tools to enable rust logging without having to magically match rustc's
|
|
/// tracing crate version.
|
|
pub fn init_rustc_env_logger() {
|
|
init_env_logger("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 an env var
|
|
/// other than `RUSTC_LOG`.
|
|
pub fn init_env_logger(env: &str) {
|
|
// Don't register a dispatcher if there's no filter to print anything
|
|
match std::env::var(env) {
|
|
Err(_) => return,
|
|
Ok(s) if s.is_empty() => return,
|
|
Ok(_) => {}
|
|
}
|
|
let color_logs = match std::env::var(String::from(env) + "_COLOR") {
|
|
Ok(value) => match value.as_ref() {
|
|
"always" => true,
|
|
"never" => false,
|
|
"auto" => stderr_isatty(),
|
|
_ => early_error(
|
|
ErrorOutputType::default(),
|
|
&format!(
|
|
"invalid log color value '{}': expected one of always, never, or auto",
|
|
value
|
|
),
|
|
),
|
|
},
|
|
Err(std::env::VarError::NotPresent) => stderr_isatty(),
|
|
Err(std::env::VarError::NotUnicode(_value)) => early_error(
|
|
ErrorOutputType::default(),
|
|
"non-Unicode log color value: expected one of always, never, or auto",
|
|
),
|
|
};
|
|
let filter = tracing_subscriber::EnvFilter::from_env(env);
|
|
let layer = tracing_tree::HierarchicalLayer::default()
|
|
.with_writer(io::stderr)
|
|
.with_indent_lines(true)
|
|
.with_ansi(color_logs)
|
|
.with_targets(true)
|
|
.with_wraparound(10)
|
|
.with_verbose_exit(true)
|
|
.with_verbose_entry(true)
|
|
.with_indent_amount(2);
|
|
#[cfg(parallel_compiler)]
|
|
let layer = layer.with_thread_ids(true).with_thread_names(true);
|
|
|
|
use tracing_subscriber::layer::SubscriberExt;
|
|
let subscriber = tracing_subscriber::Registry::default().with(filter).with(layer);
|
|
tracing::subscriber::set_global_default(subscriber).unwrap();
|
|
}
|
|
|
|
pub fn main() -> ! {
|
|
let start = Instant::now();
|
|
init_rustc_env_logger();
|
|
let mut callbacks = TimePassesCallbacks::default();
|
|
install_ice_hook();
|
|
let exit_code = catch_with_exit_code(|| {
|
|
let args = env::args_os()
|
|
.enumerate()
|
|
.map(|(i, arg)| {
|
|
arg.into_string().unwrap_or_else(|arg| {
|
|
early_error(
|
|
ErrorOutputType::default(),
|
|
&format!("argument {} is not valid Unicode: {:?}", i, arg),
|
|
)
|
|
})
|
|
})
|
|
.collect::<Vec<_>>();
|
|
RunCompiler::new(&args, &mut callbacks).run()
|
|
});
|
|
// The extra `\t` is necessary to align this label with the others.
|
|
print_time_passes_entry(callbacks.time_passes, "\ttotal", start.elapsed());
|
|
process::exit(exit_code)
|
|
}
|