mirror of
https://github.com/rust-lang/rust.git
synced 2025-10-31 21:16:44 +00:00
562 lines
22 KiB
Rust
562 lines
22 KiB
Rust
use std::env::consts::{DLL_PREFIX, DLL_SUFFIX};
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use std::path::{Path, PathBuf};
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use std::sync::OnceLock;
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::{env, iter, thread};
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use rustc_ast as ast;
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use rustc_codegen_ssa::traits::CodegenBackend;
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use rustc_data_structures::sync;
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use rustc_metadata::{DylibError, load_symbol_from_dylib};
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use rustc_middle::ty::CurrentGcx;
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use rustc_parse::validate_attr;
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use rustc_session::config::{Cfg, OutFileName, OutputFilenames, OutputTypes, host_tuple};
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use rustc_session::filesearch::sysroot_candidates;
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use rustc_session::lint::{self, BuiltinLintDiag, LintBuffer};
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use rustc_session::output::{CRATE_TYPES, categorize_crate_type};
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use rustc_session::{EarlyDiagCtxt, Session, filesearch};
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use rustc_span::edit_distance::find_best_match_for_name;
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use rustc_span::edition::Edition;
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use rustc_span::source_map::SourceMapInputs;
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use rustc_span::{Symbol, sym};
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use rustc_target::spec::Target;
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use tracing::info;
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use crate::errors;
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/// Function pointer type that constructs a new CodegenBackend.
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type MakeBackendFn = fn() -> Box<dyn CodegenBackend>;
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/// Adds `target_feature = "..."` cfgs for a variety of platform
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/// specific features (SSE, NEON etc.).
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///
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/// This is performed by checking whether a set of permitted features
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/// is available on the target machine, by querying the codegen backend.
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pub(crate) fn add_configuration(
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cfg: &mut Cfg,
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sess: &mut Session,
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codegen_backend: &dyn CodegenBackend,
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) {
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let tf = sym::target_feature;
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let (target_features, unstable_target_features) = codegen_backend.target_features_cfg(sess);
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sess.unstable_target_features.extend(unstable_target_features.iter().copied());
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sess.target_features.extend(target_features.iter().copied());
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cfg.extend(target_features.into_iter().map(|feat| (tf, Some(feat))));
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if sess.crt_static(None) {
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cfg.insert((tf, Some(sym::crt_dash_static)));
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}
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}
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/// Ensures that all target features required by the ABI are present.
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/// Must be called after `unstable_target_features` has been populated!
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pub(crate) fn check_abi_required_features(sess: &Session) {
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let abi_feature_constraints = sess.target.abi_required_features();
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// We check this against `unstable_target_features` as that is conveniently already
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// back-translated to rustc feature names, taking into account `-Ctarget-cpu` and `-Ctarget-feature`.
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// Just double-check that the features we care about are actually on our list.
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for feature in
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abi_feature_constraints.required.iter().chain(abi_feature_constraints.incompatible.iter())
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{
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assert!(
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sess.target.rust_target_features().iter().any(|(name, ..)| feature == name),
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"target feature {feature} is required/incompatible for the current ABI but not a recognized feature for this target"
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);
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}
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for feature in abi_feature_constraints.required {
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if !sess.unstable_target_features.contains(&Symbol::intern(feature)) {
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sess.dcx().emit_warn(errors::AbiRequiredTargetFeature { feature, enabled: "enabled" });
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}
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}
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for feature in abi_feature_constraints.incompatible {
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if sess.unstable_target_features.contains(&Symbol::intern(feature)) {
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sess.dcx().emit_warn(errors::AbiRequiredTargetFeature { feature, enabled: "disabled" });
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}
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}
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}
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pub static STACK_SIZE: OnceLock<usize> = OnceLock::new();
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pub const DEFAULT_STACK_SIZE: usize = 8 * 1024 * 1024;
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fn init_stack_size(early_dcx: &EarlyDiagCtxt) -> usize {
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// Obey the environment setting or default
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*STACK_SIZE.get_or_init(|| {
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env::var_os("RUST_MIN_STACK")
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.as_ref()
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.map(|os_str| os_str.to_string_lossy())
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// if someone finds out `export RUST_MIN_STACK=640000` isn't enough stack
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// they might try to "unset" it by running `RUST_MIN_STACK= rustc code.rs`
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// this is wrong, but std would nonetheless "do what they mean", so let's do likewise
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.filter(|s| !s.trim().is_empty())
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// rustc is a batch program, so error early on inputs which are unlikely to be intended
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// so no one thinks we parsed them setting `RUST_MIN_STACK="64 megabytes"`
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// FIXME: we could accept `RUST_MIN_STACK=64MB`, perhaps?
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.map(|s| {
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let s = s.trim();
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// FIXME(workingjubilee): add proper diagnostics when we factor out "pre-run" setup
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#[allow(rustc::untranslatable_diagnostic, rustc::diagnostic_outside_of_impl)]
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s.parse::<usize>().unwrap_or_else(|_| {
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let mut err = early_dcx.early_struct_fatal(format!(
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r#"`RUST_MIN_STACK` should be a number of bytes, but was "{s}""#,
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));
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err.note("you can also unset `RUST_MIN_STACK` to use the default stack size");
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err.emit()
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})
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})
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// otherwise pick a consistent default
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.unwrap_or(DEFAULT_STACK_SIZE)
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})
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}
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fn run_in_thread_with_globals<F: FnOnce(CurrentGcx) -> R + Send, R: Send>(
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thread_stack_size: usize,
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edition: Edition,
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sm_inputs: SourceMapInputs,
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f: F,
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) -> R {
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// The "thread pool" is a single spawned thread in the non-parallel
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// compiler. We run on a spawned thread instead of the main thread (a) to
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// provide control over the stack size, and (b) to increase similarity with
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// the parallel compiler, in particular to ensure there is no accidental
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// sharing of data between the main thread and the compilation thread
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// (which might cause problems for the parallel compiler).
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let builder = thread::Builder::new().name("rustc".to_string()).stack_size(thread_stack_size);
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// We build the session globals and run `f` on the spawned thread, because
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// `SessionGlobals` does not impl `Send` in the non-parallel compiler.
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thread::scope(|s| {
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// `unwrap` is ok here because `spawn_scoped` only panics if the thread
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// name contains null bytes.
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let r = builder
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.spawn_scoped(s, move || {
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rustc_span::create_session_globals_then(edition, Some(sm_inputs), || {
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f(CurrentGcx::new())
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})
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})
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.unwrap()
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.join();
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match r {
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Ok(v) => v,
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Err(e) => std::panic::resume_unwind(e),
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}
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})
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}
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pub(crate) fn run_in_thread_pool_with_globals<F: FnOnce(CurrentGcx) -> R + Send, R: Send>(
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thread_builder_diag: &EarlyDiagCtxt,
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edition: Edition,
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threads: usize,
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sm_inputs: SourceMapInputs,
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f: F,
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) -> R {
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use std::process;
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use rustc_data_structures::sync::FromDyn;
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use rustc_data_structures::{defer, jobserver};
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use rustc_middle::ty::tls;
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use rustc_query_impl::QueryCtxt;
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use rustc_query_system::query::{QueryContext, break_query_cycles};
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let thread_stack_size = init_stack_size(thread_builder_diag);
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let registry = sync::Registry::new(std::num::NonZero::new(threads).unwrap());
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if !sync::is_dyn_thread_safe() {
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return run_in_thread_with_globals(thread_stack_size, edition, sm_inputs, |current_gcx| {
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// Register the thread for use with the `WorkerLocal` type.
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registry.register();
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f(current_gcx)
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});
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}
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let current_gcx = FromDyn::from(CurrentGcx::new());
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let current_gcx2 = current_gcx.clone();
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let builder = rayon::ThreadPoolBuilder::new()
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.thread_name(|_| "rustc".to_string())
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.acquire_thread_handler(jobserver::acquire_thread)
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.release_thread_handler(jobserver::release_thread)
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.num_threads(threads)
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.deadlock_handler(move || {
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// On deadlock, creates a new thread and forwards information in thread
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// locals to it. The new thread runs the deadlock handler.
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// Get a `GlobalCtxt` reference from `CurrentGcx` as we cannot rely on having a
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// `TyCtxt` TLS reference here.
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let query_map = current_gcx2.access(|gcx| {
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tls::enter_context(&tls::ImplicitCtxt::new(gcx), || {
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tls::with(|tcx| {
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match QueryCtxt::new(tcx).collect_active_jobs() {
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Ok(query_map) => query_map,
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Err(_) => {
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// There was an unexpected error collecting all active jobs, which we need
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// to find cycles to break.
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// We want to avoid panicking in the deadlock handler, so we abort instead.
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eprintln!("internal compiler error: failed to get query map in deadlock handler, aborting process");
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process::abort();
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}
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}
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})
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})
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});
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let query_map = FromDyn::from(query_map);
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let registry = rayon_core::Registry::current();
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thread::Builder::new()
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.name("rustc query cycle handler".to_string())
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.spawn(move || {
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let on_panic = defer(|| {
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eprintln!("internal compiler error: query cycle handler thread panicked, aborting process");
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// We need to abort here as we failed to resolve the deadlock,
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// otherwise the compiler could just hang,
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process::abort();
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});
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break_query_cycles(query_map.into_inner(), ®istry);
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on_panic.disable();
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})
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.unwrap();
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})
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.stack_size(thread_stack_size);
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// We create the session globals on the main thread, then create the thread
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// pool. Upon creation, each worker thread created gets a copy of the
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// session globals in TLS. This is possible because `SessionGlobals` impls
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// `Send` in the parallel compiler.
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rustc_span::create_session_globals_then(edition, Some(sm_inputs), || {
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rustc_span::with_session_globals(|session_globals| {
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let session_globals = FromDyn::from(session_globals);
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builder
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.build_scoped(
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// Initialize each new worker thread when created.
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move |thread: rayon::ThreadBuilder| {
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// Register the thread for use with the `WorkerLocal` type.
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registry.register();
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rustc_span::set_session_globals_then(session_globals.into_inner(), || {
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thread.run()
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})
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},
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// Run `f` on the first thread in the thread pool.
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move |pool: &rayon::ThreadPool| pool.install(|| f(current_gcx.into_inner())),
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)
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.unwrap()
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})
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})
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}
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#[allow(rustc::untranslatable_diagnostic)] // FIXME: make this translatable
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fn load_backend_from_dylib(early_dcx: &EarlyDiagCtxt, path: &Path) -> MakeBackendFn {
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match unsafe { load_symbol_from_dylib::<MakeBackendFn>(path, "__rustc_codegen_backend") } {
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Ok(backend_sym) => backend_sym,
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Err(DylibError::DlOpen(path, err)) => {
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let err = format!("couldn't load codegen backend {path}{err}");
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early_dcx.early_fatal(err);
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}
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Err(DylibError::DlSym(_path, err)) => {
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let e = format!(
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"`__rustc_codegen_backend` symbol lookup in the codegen backend failed{err}",
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);
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early_dcx.early_fatal(e);
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}
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}
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}
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/// Get the codegen backend based on the name and specified sysroot.
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///
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/// A name of `None` indicates that the default backend should be used.
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pub fn get_codegen_backend(
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early_dcx: &EarlyDiagCtxt,
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sysroot: &Path,
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backend_name: Option<&str>,
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target: &Target,
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) -> Box<dyn CodegenBackend> {
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static LOAD: OnceLock<unsafe fn() -> Box<dyn CodegenBackend>> = OnceLock::new();
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let load = LOAD.get_or_init(|| {
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let backend = backend_name
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.or(target.default_codegen_backend.as_deref())
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.or(option_env!("CFG_DEFAULT_CODEGEN_BACKEND"))
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.unwrap_or("llvm");
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match backend {
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filename if filename.contains('.') => {
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load_backend_from_dylib(early_dcx, filename.as_ref())
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}
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#[cfg(feature = "llvm")]
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"llvm" => rustc_codegen_llvm::LlvmCodegenBackend::new,
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backend_name => get_codegen_sysroot(early_dcx, sysroot, backend_name),
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}
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});
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// SAFETY: In case of a builtin codegen backend this is safe. In case of an external codegen
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// backend we hope that the backend links against the same rustc_driver version. If this is not
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// the case, we get UB.
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unsafe { load() }
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}
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// This is used for rustdoc, but it uses similar machinery to codegen backend
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// loading, so we leave the code here. It is potentially useful for other tools
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// that want to invoke the rustc binary while linking to rustc as well.
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pub fn rustc_path<'a>() -> Option<&'a Path> {
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static RUSTC_PATH: OnceLock<Option<PathBuf>> = OnceLock::new();
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const BIN_PATH: &str = env!("RUSTC_INSTALL_BINDIR");
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RUSTC_PATH.get_or_init(|| get_rustc_path_inner(BIN_PATH)).as_deref()
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}
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fn get_rustc_path_inner(bin_path: &str) -> Option<PathBuf> {
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sysroot_candidates().iter().find_map(|sysroot| {
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let candidate = sysroot.join(bin_path).join(if cfg!(target_os = "windows") {
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"rustc.exe"
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} else {
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"rustc"
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});
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candidate.exists().then_some(candidate)
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})
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}
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#[allow(rustc::untranslatable_diagnostic)] // FIXME: make this translatable
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fn get_codegen_sysroot(
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early_dcx: &EarlyDiagCtxt,
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sysroot: &Path,
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backend_name: &str,
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) -> MakeBackendFn {
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// For now we only allow this function to be called once as it'll dlopen a
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// few things, which seems to work best if we only do that once. In
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// general this assertion never trips due to the once guard in `get_codegen_backend`,
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// but there's a few manual calls to this function in this file we protect
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// against.
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static LOADED: AtomicBool = AtomicBool::new(false);
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assert!(
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!LOADED.fetch_or(true, Ordering::SeqCst),
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"cannot load the default codegen backend twice"
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);
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let target = host_tuple();
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let sysroot_candidates = sysroot_candidates();
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let sysroot = iter::once(sysroot)
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.chain(sysroot_candidates.iter().map(<_>::as_ref))
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.map(|sysroot| {
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filesearch::make_target_lib_path(sysroot, target).with_file_name("codegen-backends")
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})
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.find(|f| {
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info!("codegen backend candidate: {}", f.display());
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f.exists()
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})
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.unwrap_or_else(|| {
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let candidates = sysroot_candidates
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.iter()
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.map(|p| p.display().to_string())
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.collect::<Vec<_>>()
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.join("\n* ");
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let err = format!(
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"failed to find a `codegen-backends` folder \
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in the sysroot candidates:\n* {candidates}"
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);
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early_dcx.early_fatal(err);
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});
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info!("probing {} for a codegen backend", sysroot.display());
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let d = sysroot.read_dir().unwrap_or_else(|e| {
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let err = format!(
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"failed to load default codegen backend, couldn't \
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read `{}`: {}",
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sysroot.display(),
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e
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);
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early_dcx.early_fatal(err);
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});
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let mut file: Option<PathBuf> = None;
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let expected_names = &[
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format!("rustc_codegen_{}-{}", backend_name, env!("CFG_RELEASE")),
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format!("rustc_codegen_{backend_name}"),
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];
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for entry in d.filter_map(|e| e.ok()) {
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let path = entry.path();
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let Some(filename) = path.file_name().and_then(|s| s.to_str()) else { continue };
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if !(filename.starts_with(DLL_PREFIX) && filename.ends_with(DLL_SUFFIX)) {
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continue;
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}
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let name = &filename[DLL_PREFIX.len()..filename.len() - DLL_SUFFIX.len()];
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if !expected_names.iter().any(|expected| expected == name) {
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continue;
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}
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if let Some(ref prev) = file {
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let err = format!(
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"duplicate codegen backends found\n\
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first: {}\n\
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second: {}\n\
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",
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prev.display(),
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path.display()
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);
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early_dcx.early_fatal(err);
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}
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file = Some(path.clone());
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}
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match file {
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Some(ref s) => load_backend_from_dylib(early_dcx, s),
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None => {
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let err = format!("unsupported builtin codegen backend `{backend_name}`");
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early_dcx.early_fatal(err);
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}
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}
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}
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pub(crate) fn check_attr_crate_type(
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sess: &Session,
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attrs: &[ast::Attribute],
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lint_buffer: &mut LintBuffer,
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) {
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// Unconditionally collect crate types from attributes to make them used
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for a in attrs.iter() {
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if a.has_name(sym::crate_type) {
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if let Some(n) = a.value_str() {
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if categorize_crate_type(n).is_some() {
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return;
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}
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|
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if let ast::MetaItemKind::NameValue(spanned) = a.meta_kind().unwrap() {
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let span = spanned.span;
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let candidate = find_best_match_for_name(
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&CRATE_TYPES.iter().map(|(k, _)| *k).collect::<Vec<_>>(),
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n,
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None,
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);
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lint_buffer.buffer_lint(
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lint::builtin::UNKNOWN_CRATE_TYPES,
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ast::CRATE_NODE_ID,
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span,
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BuiltinLintDiag::UnknownCrateTypes { span, candidate },
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);
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}
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} else {
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// This is here mainly to check for using a macro, such as
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// `#![crate_type = foo!()]`. That is not supported since the
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// crate type needs to be known very early in compilation long
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// before expansion. Otherwise, validation would normally be
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// caught during semantic analysis via `TyCtxt::check_mod_attrs`,
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// but by the time that runs the macro is expanded, and it doesn't
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// give an error.
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validate_attr::emit_fatal_malformed_builtin_attribute(
|
|
&sess.psess,
|
|
a,
|
|
sym::crate_type,
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn multiple_output_types_to_stdout(
|
|
output_types: &OutputTypes,
|
|
single_output_file_is_stdout: bool,
|
|
) -> bool {
|
|
use std::io::IsTerminal;
|
|
if std::io::stdout().is_terminal() {
|
|
// If stdout is a tty, check if multiple text output types are
|
|
// specified by `--emit foo=- --emit bar=-` or `-o - --emit foo,bar`
|
|
let named_text_types = output_types
|
|
.iter()
|
|
.filter(|(f, o)| f.is_text_output() && *o == &Some(OutFileName::Stdout))
|
|
.count();
|
|
let unnamed_text_types =
|
|
output_types.iter().filter(|(f, o)| f.is_text_output() && o.is_none()).count();
|
|
named_text_types > 1 || unnamed_text_types > 1 && single_output_file_is_stdout
|
|
} else {
|
|
// Otherwise, all the output types should be checked
|
|
let named_types =
|
|
output_types.values().filter(|o| *o == &Some(OutFileName::Stdout)).count();
|
|
let unnamed_types = output_types.values().filter(|o| o.is_none()).count();
|
|
named_types > 1 || unnamed_types > 1 && single_output_file_is_stdout
|
|
}
|
|
}
|
|
|
|
pub fn build_output_filenames(attrs: &[ast::Attribute], sess: &Session) -> OutputFilenames {
|
|
if multiple_output_types_to_stdout(
|
|
&sess.opts.output_types,
|
|
sess.io.output_file == Some(OutFileName::Stdout),
|
|
) {
|
|
sess.dcx().emit_fatal(errors::MultipleOutputTypesToStdout);
|
|
}
|
|
|
|
let crate_name = sess
|
|
.opts
|
|
.crate_name
|
|
.clone()
|
|
.or_else(|| rustc_attr_parsing::find_crate_name(attrs).map(|n| n.to_string()));
|
|
|
|
match sess.io.output_file {
|
|
None => {
|
|
// "-" as input file will cause the parser to read from stdin so we
|
|
// have to make up a name
|
|
// We want to toss everything after the final '.'
|
|
let dirpath = sess.io.output_dir.clone().unwrap_or_default();
|
|
|
|
// If a crate name is present, we use it as the link name
|
|
let stem = crate_name.clone().unwrap_or_else(|| sess.io.input.filestem().to_owned());
|
|
|
|
OutputFilenames::new(
|
|
dirpath,
|
|
crate_name.unwrap_or_else(|| stem.replace('-', "_")),
|
|
stem,
|
|
None,
|
|
sess.io.temps_dir.clone(),
|
|
sess.opts.cg.extra_filename.clone(),
|
|
sess.opts.output_types.clone(),
|
|
)
|
|
}
|
|
|
|
Some(ref out_file) => {
|
|
let unnamed_output_types =
|
|
sess.opts.output_types.values().filter(|a| a.is_none()).count();
|
|
let ofile = if unnamed_output_types > 1 {
|
|
sess.dcx().emit_warn(errors::MultipleOutputTypesAdaption);
|
|
None
|
|
} else {
|
|
if !sess.opts.cg.extra_filename.is_empty() {
|
|
sess.dcx().emit_warn(errors::IgnoringExtraFilename);
|
|
}
|
|
Some(out_file.clone())
|
|
};
|
|
if sess.io.output_dir != None {
|
|
sess.dcx().emit_warn(errors::IgnoringOutDir);
|
|
}
|
|
|
|
let out_filestem =
|
|
out_file.filestem().unwrap_or_default().to_str().unwrap().to_string();
|
|
OutputFilenames::new(
|
|
out_file.parent().unwrap_or_else(|| Path::new("")).to_path_buf(),
|
|
crate_name.unwrap_or_else(|| out_filestem.replace('-', "_")),
|
|
out_filestem,
|
|
ofile,
|
|
sess.io.temps_dir.clone(),
|
|
sess.opts.cg.extra_filename.clone(),
|
|
sess.opts.output_types.clone(),
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Returns a version string such as "1.46.0 (04488afe3 2020-08-24)" when invoked by an in-tree tool.
|
|
pub macro version_str() {
|
|
option_env!("CFG_VERSION")
|
|
}
|
|
|
|
/// Returns the version string for `rustc` itself (which may be different from a tool version).
|
|
pub fn rustc_version_str() -> Option<&'static str> {
|
|
version_str!()
|
|
}
|