1 use crate::cgu_reuse_tracker::CguReuseTracker;
2 use crate::code_stats::CodeStats;
3 pub use crate::code_stats::{DataTypeKind, FieldInfo, SizeKind, VariantInfo};
4 use crate::config::{self, CrateType, OutputType, SwitchWithOptPath};
5 use crate::parse::ParseSess;
6 use crate::search_paths::{PathKind, SearchPath};
7 use crate::{filesearch, lint};
9 pub use rustc_ast::attr::MarkedAttrs;
10 pub use rustc_ast::Attribute;
11 use rustc_data_structures::flock;
12 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
13 use rustc_data_structures::jobserver::{self, Client};
14 use rustc_data_structures::profiling::{duration_to_secs_str, SelfProfiler, SelfProfilerRef};
15 use rustc_data_structures::sync::{
16 self, AtomicU64, AtomicUsize, Lock, Lrc, OnceCell, OneThread, Ordering, Ordering::SeqCst,
18 use rustc_errors::annotate_snippet_emitter_writer::AnnotateSnippetEmitterWriter;
19 use rustc_errors::emitter::{Emitter, EmitterWriter, HumanReadableErrorType};
20 use rustc_errors::json::JsonEmitter;
21 use rustc_errors::registry::Registry;
23 fallback_fluent_bundle, DiagnosticBuilder, DiagnosticId, DiagnosticMessage, EmissionGuarantee,
24 ErrorGuaranteed, FluentBundle, LazyFallbackBundle, MultiSpan,
26 use rustc_macros::HashStable_Generic;
27 pub use rustc_span::def_id::StableCrateId;
28 use rustc_span::edition::Edition;
29 use rustc_span::source_map::{FileLoader, RealFileLoader, SourceMap, Span};
30 use rustc_span::{sym, SourceFileHashAlgorithm, Symbol};
31 use rustc_target::asm::InlineAsmArch;
32 use rustc_target::spec::{CodeModel, PanicStrategy, RelocModel, RelroLevel};
33 use rustc_target::spec::{
34 SanitizerSet, SplitDebuginfo, StackProtector, Target, TargetTriple, TlsModel,
37 use std::cell::{self, RefCell};
41 use std::ops::{Div, Mul};
42 use std::path::{Path, PathBuf};
43 use std::str::FromStr;
45 use std::time::Duration;
47 pub struct OptimizationFuel {
48 /// If `-zfuel=crate=n` is specified, initially set to `n`, otherwise `0`.
50 /// We're rejecting all further optimizations.
54 /// The behavior of the CTFE engine when an error occurs with regards to backtraces.
55 #[derive(Clone, Copy)]
56 pub enum CtfeBacktrace {
57 /// Do nothing special, return the error as usual without a backtrace.
59 /// Capture a backtrace at the point the error is created and return it in the error
60 /// (to be printed later if/when the error ever actually gets shown to the user).
62 /// Capture a backtrace at the point the error is created and immediately print it out.
66 /// New-type wrapper around `usize` for representing limits. Ensures that comparisons against
67 /// limits are consistent throughout the compiler.
68 #[derive(Clone, Copy, Debug, HashStable_Generic)]
69 pub struct Limit(pub usize);
72 /// Create a new limit from a `usize`.
73 pub fn new(value: usize) -> Self {
77 /// Check that `value` is within the limit. Ensures that the same comparisons are used
78 /// throughout the compiler, as mismatches can cause ICEs, see #72540.
80 pub fn value_within_limit(&self, value: usize) -> bool {
85 impl From<usize> for Limit {
86 fn from(value: usize) -> Self {
91 impl fmt::Display for Limit {
92 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
97 impl Div<usize> for Limit {
100 fn div(self, rhs: usize) -> Self::Output {
101 Limit::new(self.0 / rhs)
105 impl Mul<usize> for Limit {
108 fn mul(self, rhs: usize) -> Self::Output {
109 Limit::new(self.0 * rhs)
113 #[derive(Clone, Copy, Debug, HashStable_Generic)]
115 /// The maximum recursion limit for potentially infinitely recursive
116 /// operations such as auto-dereference and monomorphization.
117 pub recursion_limit: Limit,
118 /// The size at which the `large_assignments` lint starts
120 pub move_size_limit: Limit,
121 /// The maximum length of types during monomorphization.
122 pub type_length_limit: Limit,
123 /// The maximum blocks a const expression can evaluate.
124 pub const_eval_limit: Limit,
127 /// Represents the data associated with a compilation
128 /// session for a single crate.
132 pub opts: config::Options,
133 pub host_tlib_path: Lrc<SearchPath>,
134 pub target_tlib_path: Lrc<SearchPath>,
135 pub parse_sess: ParseSess,
136 pub sysroot: PathBuf,
137 /// The name of the root source file of the crate, in the local file system.
138 /// `None` means that there is no source file.
139 pub local_crate_source_file: Option<PathBuf>,
141 crate_types: OnceCell<Vec<CrateType>>,
142 /// The `stable_crate_id` is constructed out of the crate name and all the
143 /// `-C metadata` arguments passed to the compiler. Its value forms a unique
144 /// global identifier for the crate. It is used to allow multiple crates
145 /// with the same name to coexist. See the
146 /// `rustc_codegen_llvm::back::symbol_names` module for more information.
147 pub stable_crate_id: OnceCell<StableCrateId>,
149 features: OnceCell<rustc_feature::Features>,
151 incr_comp_session: OneThread<RefCell<IncrCompSession>>,
152 /// Used for incremental compilation tests. Will only be populated if
153 /// `-Zquery-dep-graph` is specified.
154 pub cgu_reuse_tracker: CguReuseTracker,
156 /// Used by `-Z self-profile`.
157 pub prof: SelfProfilerRef,
159 /// Some measurements that are being gathered during compilation.
160 pub perf_stats: PerfStats,
162 /// Data about code being compiled, gathered during compilation.
163 pub code_stats: CodeStats,
165 /// Tracks fuel info if `-zfuel=crate=n` is specified.
166 optimization_fuel: Lock<OptimizationFuel>,
168 /// Always set to zero and incremented so that we can print fuel expended by a crate.
169 pub print_fuel: AtomicU64,
171 /// Loaded up early on in the initialization of this `Session` to avoid
172 /// false positives about a job server in our environment.
173 pub jobserver: Client,
175 /// Cap lint level specified by a driver specifically.
176 pub driver_lint_caps: FxHashMap<lint::LintId, lint::Level>,
178 /// Tracks the current behavior of the CTFE engine when an error occurs.
179 /// Options range from returning the error without a backtrace to returning an error
180 /// and immediately printing the backtrace to stderr.
181 /// The `Lock` is only used by miri to allow setting `ctfe_backtrace` after analysis when
182 /// `MIRI_BACKTRACE` is set. This makes it only apply to miri's errors and not to all CTFE
184 pub ctfe_backtrace: Lock<CtfeBacktrace>,
186 /// This tracks where `-Zunleash-the-miri-inside-of-you` was used to get around a
187 /// const check, optionally with the relevant feature gate. We use this to
188 /// warn about unleashing, but with a single diagnostic instead of dozens that
189 /// drown everything else in noise.
190 miri_unleashed_features: Lock<Vec<(Span, Option<Symbol>)>>,
192 /// Architecture to use for interpreting asm!.
193 pub asm_arch: Option<InlineAsmArch>,
195 /// Set of enabled features for the current target.
196 pub target_features: FxHashSet<Symbol>,
199 pub struct PerfStats {
200 /// The accumulated time spent on computing symbol hashes.
201 pub symbol_hash_time: Lock<Duration>,
202 /// Total number of values canonicalized queries constructed.
203 pub queries_canonicalized: AtomicUsize,
204 /// Number of times this query is invoked.
205 pub normalize_generic_arg_after_erasing_regions: AtomicUsize,
206 /// Number of times this query is invoked.
207 pub normalize_projection_ty: AtomicUsize,
210 /// Trait implemented by error types. This should not be implemented manually. Instead, use
211 /// `#[derive(SessionDiagnostic)]` -- see [rustc_macros::SessionDiagnostic].
212 pub trait SessionDiagnostic<'a, T: EmissionGuarantee = ErrorGuaranteed> {
213 /// Write out as a diagnostic out of `sess`.
215 fn into_diagnostic(self, sess: &'a ParseSess) -> DiagnosticBuilder<'a, T>;
219 pub fn miri_unleashed_feature(&self, span: Span, feature_gate: Option<Symbol>) {
220 self.miri_unleashed_features.lock().push((span, feature_gate));
223 fn check_miri_unleashed_features(&self) {
224 let unleashed_features = self.miri_unleashed_features.lock();
225 if !unleashed_features.is_empty() {
226 let mut must_err = false;
227 // Create a diagnostic pointing at where things got unleashed.
228 let mut diag = self.struct_warn("skipping const checks");
229 for &(span, feature_gate) in unleashed_features.iter() {
230 // FIXME: `span_label` doesn't do anything, so we use "help" as a hack.
231 if let Some(gate) = feature_gate {
232 diag.span_help(span, &format!("skipping check for `{gate}` feature"));
233 // The unleash flag must *not* be used to just "hack around" feature gates.
236 diag.span_help(span, "skipping check that does not even have a feature gate");
240 // If we should err, make sure we did.
241 if must_err && self.has_errors().is_none() {
242 // We have skipped a feature gate, and not run into other errors... reject.
244 "`-Zunleash-the-miri-inside-of-you` may not be used to circumvent feature \
245 gates, except when testing error paths in the CTFE engine",
251 /// Invoked all the way at the end to finish off diagnostics printing.
252 pub fn finish_diagnostics(&self, registry: &Registry) {
253 self.check_miri_unleashed_features();
254 self.diagnostic().print_error_count(registry);
255 self.emit_future_breakage();
258 fn emit_future_breakage(&self) {
259 if !self.opts.json_future_incompat {
263 let diags = self.diagnostic().take_future_breakage_diagnostics();
264 if diags.is_empty() {
267 self.parse_sess.span_diagnostic.emit_future_breakage_report(diags);
270 pub fn local_stable_crate_id(&self) -> StableCrateId {
271 self.stable_crate_id.get().copied().unwrap()
274 pub fn crate_types(&self) -> &[CrateType] {
275 self.crate_types.get().unwrap().as_slice()
278 pub fn init_crate_types(&self, crate_types: Vec<CrateType>) {
279 self.crate_types.set(crate_types).expect("`crate_types` was initialized twice")
282 pub fn struct_span_warn<S: Into<MultiSpan>>(
285 msg: impl Into<DiagnosticMessage>,
286 ) -> DiagnosticBuilder<'_, ()> {
287 self.diagnostic().struct_span_warn(sp, msg)
289 pub fn struct_span_warn_with_code<S: Into<MultiSpan>>(
292 msg: impl Into<DiagnosticMessage>,
294 ) -> DiagnosticBuilder<'_, ()> {
295 self.diagnostic().struct_span_warn_with_code(sp, msg, code)
297 pub fn struct_warn(&self, msg: impl Into<DiagnosticMessage>) -> DiagnosticBuilder<'_, ()> {
298 self.diagnostic().struct_warn(msg)
300 pub fn struct_span_allow<S: Into<MultiSpan>>(
303 msg: impl Into<DiagnosticMessage>,
304 ) -> DiagnosticBuilder<'_, ()> {
305 self.diagnostic().struct_span_allow(sp, msg)
307 pub fn struct_allow(&self, msg: impl Into<DiagnosticMessage>) -> DiagnosticBuilder<'_, ()> {
308 self.diagnostic().struct_allow(msg)
310 pub fn struct_expect(
312 msg: impl Into<DiagnosticMessage>,
313 id: lint::LintExpectationId,
314 ) -> DiagnosticBuilder<'_, ()> {
315 self.diagnostic().struct_expect(msg, id)
317 pub fn struct_span_err<S: Into<MultiSpan>>(
320 msg: impl Into<DiagnosticMessage>,
321 ) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
322 self.diagnostic().struct_span_err(sp, msg)
324 pub fn struct_span_err_with_code<S: Into<MultiSpan>>(
327 msg: impl Into<DiagnosticMessage>,
329 ) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
330 self.diagnostic().struct_span_err_with_code(sp, msg, code)
332 // FIXME: This method should be removed (every error should have an associated error code).
335 msg: impl Into<DiagnosticMessage>,
336 ) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
337 self.parse_sess.struct_err(msg)
339 pub fn struct_err_with_code(
341 msg: impl Into<DiagnosticMessage>,
343 ) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
344 self.diagnostic().struct_err_with_code(msg, code)
346 pub fn struct_warn_with_code(
348 msg: impl Into<DiagnosticMessage>,
350 ) -> DiagnosticBuilder<'_, ()> {
351 self.diagnostic().struct_warn_with_code(msg, code)
353 pub fn struct_span_fatal<S: Into<MultiSpan>>(
356 msg: impl Into<DiagnosticMessage>,
357 ) -> DiagnosticBuilder<'_, !> {
358 self.diagnostic().struct_span_fatal(sp, msg)
360 pub fn struct_span_fatal_with_code<S: Into<MultiSpan>>(
363 msg: impl Into<DiagnosticMessage>,
365 ) -> DiagnosticBuilder<'_, !> {
366 self.diagnostic().struct_span_fatal_with_code(sp, msg, code)
368 pub fn struct_fatal(&self, msg: impl Into<DiagnosticMessage>) -> DiagnosticBuilder<'_, !> {
369 self.diagnostic().struct_fatal(msg)
372 pub fn span_fatal<S: Into<MultiSpan>>(&self, sp: S, msg: impl Into<DiagnosticMessage>) -> ! {
373 self.diagnostic().span_fatal(sp, msg)
375 pub fn span_fatal_with_code<S: Into<MultiSpan>>(
378 msg: impl Into<DiagnosticMessage>,
381 self.diagnostic().span_fatal_with_code(sp, msg, code)
383 pub fn fatal(&self, msg: impl Into<DiagnosticMessage>) -> ! {
384 self.diagnostic().fatal(msg).raise()
386 pub fn span_err_or_warn<S: Into<MultiSpan>>(
390 msg: impl Into<DiagnosticMessage>,
393 self.span_warn(sp, msg);
395 self.span_err(sp, msg);
398 pub fn span_err<S: Into<MultiSpan>>(
401 msg: impl Into<DiagnosticMessage>,
402 ) -> ErrorGuaranteed {
403 self.diagnostic().span_err(sp, msg)
405 pub fn span_err_with_code<S: Into<MultiSpan>>(
408 msg: impl Into<DiagnosticMessage>,
411 self.diagnostic().span_err_with_code(sp, msg, code)
413 pub fn err(&self, msg: impl Into<DiagnosticMessage>) -> ErrorGuaranteed {
414 self.diagnostic().err(msg)
416 pub fn create_err<'a>(
418 err: impl SessionDiagnostic<'a>,
419 ) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
420 self.parse_sess.create_err(err)
422 pub fn emit_err<'a>(&'a self, err: impl SessionDiagnostic<'a>) -> ErrorGuaranteed {
423 self.parse_sess.emit_err(err)
425 pub fn create_warning<'a>(
427 err: impl SessionDiagnostic<'a, ()>,
428 ) -> DiagnosticBuilder<'a, ()> {
429 self.parse_sess.create_warning(err)
431 pub fn emit_warning<'a>(&'a self, warning: impl SessionDiagnostic<'a, ()>) {
432 self.parse_sess.emit_warning(warning)
435 pub fn err_count(&self) -> usize {
436 self.diagnostic().err_count()
438 pub fn has_errors(&self) -> Option<ErrorGuaranteed> {
439 self.diagnostic().has_errors()
441 pub fn has_errors_or_delayed_span_bugs(&self) -> bool {
442 self.diagnostic().has_errors_or_delayed_span_bugs()
444 pub fn abort_if_errors(&self) {
445 self.diagnostic().abort_if_errors();
447 pub fn compile_status(&self) -> Result<(), ErrorGuaranteed> {
448 if let Some(reported) = self.diagnostic().has_errors_or_lint_errors() {
449 let _ = self.diagnostic().emit_stashed_diagnostics();
455 // FIXME(matthewjasper) Remove this method, it should never be needed.
456 pub fn track_errors<F, T>(&self, f: F) -> Result<T, ErrorGuaranteed>
460 let old_count = self.err_count();
462 if self.err_count() == old_count {
465 Err(ErrorGuaranteed::unchecked_claim_error_was_emitted())
468 pub fn span_warn<S: Into<MultiSpan>>(&self, sp: S, msg: impl Into<DiagnosticMessage>) {
469 self.diagnostic().span_warn(sp, msg)
471 pub fn span_warn_with_code<S: Into<MultiSpan>>(
474 msg: impl Into<DiagnosticMessage>,
477 self.diagnostic().span_warn_with_code(sp, msg, code)
479 pub fn warn(&self, msg: impl Into<DiagnosticMessage>) {
480 self.diagnostic().warn(msg)
482 /// Delay a span_bug() call until abort_if_errors()
484 pub fn delay_span_bug<S: Into<MultiSpan>>(
487 msg: impl Into<DiagnosticMessage>,
488 ) -> ErrorGuaranteed {
489 self.diagnostic().delay_span_bug(sp, msg)
492 /// Used for code paths of expensive computations that should only take place when
493 /// warnings or errors are emitted. If no messages are emitted ("good path"), then
494 /// it's likely a bug.
495 pub fn delay_good_path_bug(&self, msg: impl Into<DiagnosticMessage>) {
496 if self.opts.debugging_opts.print_type_sizes
497 || self.opts.debugging_opts.query_dep_graph
498 || self.opts.debugging_opts.dump_mir.is_some()
499 || self.opts.debugging_opts.unpretty.is_some()
500 || self.opts.output_types.contains_key(&OutputType::Mir)
501 || std::env::var_os("RUSTC_LOG").is_some()
506 self.diagnostic().delay_good_path_bug(msg)
509 pub fn note_without_error(&self, msg: impl Into<DiagnosticMessage>) {
510 self.diagnostic().note_without_error(msg)
512 pub fn span_note_without_error<S: Into<MultiSpan>>(
515 msg: impl Into<DiagnosticMessage>,
517 self.diagnostic().span_note_without_error(sp, msg)
519 pub fn struct_note_without_error(
521 msg: impl Into<DiagnosticMessage>,
522 ) -> DiagnosticBuilder<'_, ()> {
523 self.diagnostic().struct_note_without_error(msg)
527 pub fn diagnostic(&self) -> &rustc_errors::Handler {
528 &self.parse_sess.span_diagnostic
532 pub fn source_map(&self) -> &SourceMap {
533 self.parse_sess.source_map()
535 pub fn verbose(&self) -> bool {
536 self.opts.debugging_opts.verbose
538 pub fn time_passes(&self) -> bool {
539 self.opts.debugging_opts.time_passes || self.opts.debugging_opts.time
541 pub fn instrument_mcount(&self) -> bool {
542 self.opts.debugging_opts.instrument_mcount
544 pub fn time_llvm_passes(&self) -> bool {
545 self.opts.debugging_opts.time_llvm_passes
547 pub fn meta_stats(&self) -> bool {
548 self.opts.debugging_opts.meta_stats
550 pub fn asm_comments(&self) -> bool {
551 self.opts.debugging_opts.asm_comments
553 pub fn verify_llvm_ir(&self) -> bool {
554 self.opts.debugging_opts.verify_llvm_ir || option_env!("RUSTC_VERIFY_LLVM_IR").is_some()
556 pub fn print_llvm_passes(&self) -> bool {
557 self.opts.debugging_opts.print_llvm_passes
559 pub fn binary_dep_depinfo(&self) -> bool {
560 self.opts.debugging_opts.binary_dep_depinfo
562 pub fn mir_opt_level(&self) -> usize {
563 self.opts.mir_opt_level()
566 /// Gets the features enabled for the current compilation session.
567 /// DO NOT USE THIS METHOD if there is a TyCtxt available, as it circumvents
568 /// dependency tracking. Use tcx.features() instead.
570 pub fn features_untracked(&self) -> &rustc_feature::Features {
571 self.features.get().unwrap()
574 pub fn init_features(&self, features: rustc_feature::Features) {
575 match self.features.set(features) {
577 Err(_) => panic!("`features` was initialized twice"),
581 /// Calculates the flavor of LTO to use for this compilation.
582 pub fn lto(&self) -> config::Lto {
583 // If our target has codegen requirements ignore the command line
584 if self.target.requires_lto {
585 return config::Lto::Fat;
588 // If the user specified something, return that. If they only said `-C
589 // lto` and we've for whatever reason forced off ThinLTO via the CLI,
590 // then ensure we can't use a ThinLTO.
591 match self.opts.cg.lto {
592 config::LtoCli::Unspecified => {
593 // The compiler was invoked without the `-Clto` flag. Fall
594 // through to the default handling
596 config::LtoCli::No => {
597 // The user explicitly opted out of any kind of LTO
598 return config::Lto::No;
600 config::LtoCli::Yes | config::LtoCli::Fat | config::LtoCli::NoParam => {
601 // All of these mean fat LTO
602 return config::Lto::Fat;
604 config::LtoCli::Thin => {
605 return if self.opts.cli_forced_thinlto_off {
613 // Ok at this point the target doesn't require anything and the user
614 // hasn't asked for anything. Our next decision is whether or not
615 // we enable "auto" ThinLTO where we use multiple codegen units and
616 // then do ThinLTO over those codegen units. The logic below will
617 // either return `No` or `ThinLocal`.
619 // If processing command line options determined that we're incompatible
620 // with ThinLTO (e.g., `-C lto --emit llvm-ir`) then return that option.
621 if self.opts.cli_forced_thinlto_off {
622 return config::Lto::No;
625 // If `-Z thinlto` specified process that, but note that this is mostly
626 // a deprecated option now that `-C lto=thin` exists.
627 if let Some(enabled) = self.opts.debugging_opts.thinlto {
629 return config::Lto::ThinLocal;
631 return config::Lto::No;
635 // If there's only one codegen unit and LTO isn't enabled then there's
636 // no need for ThinLTO so just return false.
637 if self.codegen_units() == 1 {
638 return config::Lto::No;
641 // Now we're in "defaults" territory. By default we enable ThinLTO for
642 // optimized compiles (anything greater than O0).
643 match self.opts.optimize {
644 config::OptLevel::No => config::Lto::No,
645 _ => config::Lto::ThinLocal,
649 /// Returns the panic strategy for this compile session. If the user explicitly selected one
650 /// using '-C panic', use that, otherwise use the panic strategy defined by the target.
651 pub fn panic_strategy(&self) -> PanicStrategy {
652 self.opts.cg.panic.unwrap_or(self.target.panic_strategy)
654 pub fn fewer_names(&self) -> bool {
655 if let Some(fewer_names) = self.opts.debugging_opts.fewer_names {
658 let more_names = self.opts.output_types.contains_key(&OutputType::LlvmAssembly)
659 || self.opts.output_types.contains_key(&OutputType::Bitcode)
660 // AddressSanitizer and MemorySanitizer use alloca name when reporting an issue.
661 || self.opts.debugging_opts.sanitizer.intersects(SanitizerSet::ADDRESS | SanitizerSet::MEMORY);
666 pub fn unstable_options(&self) -> bool {
667 self.opts.debugging_opts.unstable_options
669 pub fn is_nightly_build(&self) -> bool {
670 self.opts.unstable_features.is_nightly_build()
672 pub fn is_sanitizer_cfi_enabled(&self) -> bool {
673 self.opts.debugging_opts.sanitizer.contains(SanitizerSet::CFI)
675 pub fn overflow_checks(&self) -> bool {
676 self.opts.cg.overflow_checks.unwrap_or(self.opts.debug_assertions)
679 /// Check whether this compile session and crate type use static crt.
680 pub fn crt_static(&self, crate_type: Option<CrateType>) -> bool {
681 if !self.target.crt_static_respected {
682 // If the target does not opt in to crt-static support, use its default.
683 return self.target.crt_static_default;
686 let requested_features = self.opts.cg.target_feature.split(',');
687 let found_negative = requested_features.clone().any(|r| r == "-crt-static");
688 let found_positive = requested_features.clone().any(|r| r == "+crt-static");
690 if found_positive || found_negative {
692 } else if crate_type == Some(CrateType::ProcMacro)
693 || crate_type == None && self.opts.crate_types.contains(&CrateType::ProcMacro)
695 // FIXME: When crate_type is not available,
696 // we use compiler options to determine the crate_type.
697 // We can't check `#![crate_type = "proc-macro"]` here.
700 self.target.crt_static_default
704 pub fn relocation_model(&self) -> RelocModel {
705 self.opts.cg.relocation_model.unwrap_or(self.target.relocation_model)
708 pub fn code_model(&self) -> Option<CodeModel> {
709 self.opts.cg.code_model.or(self.target.code_model)
712 pub fn tls_model(&self) -> TlsModel {
713 self.opts.debugging_opts.tls_model.unwrap_or(self.target.tls_model)
716 pub fn is_wasi_reactor(&self) -> bool {
717 self.target.options.os == "wasi"
719 self.opts.debugging_opts.wasi_exec_model,
720 Some(config::WasiExecModel::Reactor)
724 pub fn split_debuginfo(&self) -> SplitDebuginfo {
725 self.opts.cg.split_debuginfo.unwrap_or(self.target.split_debuginfo)
728 pub fn stack_protector(&self) -> StackProtector {
729 if self.target.options.supports_stack_protector {
730 self.opts.debugging_opts.stack_protector
736 pub fn target_can_use_split_dwarf(&self) -> bool {
737 !self.target.is_like_windows && !self.target.is_like_osx
740 pub fn must_emit_unwind_tables(&self) -> bool {
741 // This is used to control the emission of the `uwtable` attribute on
744 // Unwind tables are needed when compiling with `-C panic=unwind`, but
745 // LLVM won't omit unwind tables unless the function is also marked as
746 // `nounwind`, so users are allowed to disable `uwtable` emission.
747 // Historically rustc always emits `uwtable` attributes by default, so
748 // even they can be disabled, they're still emitted by default.
750 // On some targets (including windows), however, exceptions include
751 // other events such as illegal instructions, segfaults, etc. This means
752 // that on Windows we end up still needing unwind tables even if the `-C
753 // panic=abort` flag is passed.
755 // You can also find more info on why Windows needs unwind tables in:
756 // https://bugzilla.mozilla.org/show_bug.cgi?id=1302078
758 // If a target requires unwind tables, then they must be emitted.
759 // Otherwise, we can defer to the `-C force-unwind-tables=<yes/no>`
760 // value, if it is provided, or disable them, if not.
761 self.target.requires_uwtable
762 || self.opts.cg.force_unwind_tables.unwrap_or(
763 self.panic_strategy() == PanicStrategy::Unwind || self.target.default_uwtable,
767 pub fn generate_proc_macro_decls_symbol(&self, stable_crate_id: StableCrateId) -> String {
768 format!("__rustc_proc_macro_decls_{:08x}__", stable_crate_id.to_u64())
771 pub fn target_filesearch(&self, kind: PathKind) -> filesearch::FileSearch<'_> {
772 filesearch::FileSearch::new(
774 self.opts.target_triple.triple(),
775 &self.opts.search_paths,
776 &self.target_tlib_path,
780 pub fn host_filesearch(&self, kind: PathKind) -> filesearch::FileSearch<'_> {
781 filesearch::FileSearch::new(
783 config::host_triple(),
784 &self.opts.search_paths,
785 &self.host_tlib_path,
790 /// Returns a list of directories where target-specific tool binaries are located.
791 pub fn get_tools_search_paths(&self, self_contained: bool) -> Vec<PathBuf> {
792 let rustlib_path = rustc_target::target_rustlib_path(&self.sysroot, &config::host_triple());
793 let p = PathBuf::from_iter([
794 Path::new(&self.sysroot),
795 Path::new(&rustlib_path),
798 if self_contained { vec![p.clone(), p.join("self-contained")] } else { vec![p] }
801 pub fn init_incr_comp_session(
803 session_dir: PathBuf,
804 lock_file: flock::Lock,
805 load_dep_graph: bool,
807 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
809 if let IncrCompSession::NotInitialized = *incr_comp_session {
811 panic!("Trying to initialize IncrCompSession `{:?}`", *incr_comp_session)
815 IncrCompSession::Active { session_directory: session_dir, lock_file, load_dep_graph };
818 pub fn finalize_incr_comp_session(&self, new_directory_path: PathBuf) {
819 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
821 if let IncrCompSession::Active { .. } = *incr_comp_session {
823 panic!("trying to finalize `IncrCompSession` `{:?}`", *incr_comp_session);
826 // Note: this will also drop the lock file, thus unlocking the directory.
827 *incr_comp_session = IncrCompSession::Finalized { session_directory: new_directory_path };
830 pub fn mark_incr_comp_session_as_invalid(&self) {
831 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
833 let session_directory = match *incr_comp_session {
834 IncrCompSession::Active { ref session_directory, .. } => session_directory.clone(),
835 IncrCompSession::InvalidBecauseOfErrors { .. } => return,
836 _ => panic!("trying to invalidate `IncrCompSession` `{:?}`", *incr_comp_session),
839 // Note: this will also drop the lock file, thus unlocking the directory.
840 *incr_comp_session = IncrCompSession::InvalidBecauseOfErrors { session_directory };
843 pub fn incr_comp_session_dir(&self) -> cell::Ref<'_, PathBuf> {
844 let incr_comp_session = self.incr_comp_session.borrow();
845 cell::Ref::map(incr_comp_session, |incr_comp_session| match *incr_comp_session {
846 IncrCompSession::NotInitialized => panic!(
847 "trying to get session directory from `IncrCompSession`: {:?}",
850 IncrCompSession::Active { ref session_directory, .. }
851 | IncrCompSession::Finalized { ref session_directory }
852 | IncrCompSession::InvalidBecauseOfErrors { ref session_directory } => {
858 pub fn incr_comp_session_dir_opt(&self) -> Option<cell::Ref<'_, PathBuf>> {
859 self.opts.incremental.as_ref().map(|_| self.incr_comp_session_dir())
862 pub fn print_perf_stats(&self) {
864 "Total time spent computing symbol hashes: {}",
865 duration_to_secs_str(*self.perf_stats.symbol_hash_time.lock())
868 "Total queries canonicalized: {}",
869 self.perf_stats.queries_canonicalized.load(Ordering::Relaxed)
872 "normalize_generic_arg_after_erasing_regions: {}",
873 self.perf_stats.normalize_generic_arg_after_erasing_regions.load(Ordering::Relaxed)
876 "normalize_projection_ty: {}",
877 self.perf_stats.normalize_projection_ty.load(Ordering::Relaxed)
881 /// We want to know if we're allowed to do an optimization for crate foo from -z fuel=foo=n.
882 /// This expends fuel if applicable, and records fuel if applicable.
883 pub fn consider_optimizing<T: Fn() -> String>(&self, crate_name: &str, msg: T) -> bool {
885 if let Some((ref c, _)) = self.opts.debugging_opts.fuel {
887 assert_eq!(self.threads(), 1);
888 let mut fuel = self.optimization_fuel.lock();
889 ret = fuel.remaining != 0;
890 if fuel.remaining == 0 && !fuel.out_of_fuel {
891 if self.diagnostic().can_emit_warnings() {
892 // We only call `msg` in case we can actually emit warnings.
893 // Otherwise, this could cause a `delay_good_path_bug` to
894 // trigger (issue #79546).
895 self.warn(&format!("optimization-fuel-exhausted: {}", msg()));
897 fuel.out_of_fuel = true;
898 } else if fuel.remaining > 0 {
903 if let Some(ref c) = self.opts.debugging_opts.print_fuel {
905 assert_eq!(self.threads(), 1);
906 self.print_fuel.fetch_add(1, SeqCst);
912 /// Returns the number of query threads that should be used for this
914 pub fn threads(&self) -> usize {
915 self.opts.debugging_opts.threads
918 /// Returns the number of codegen units that should be used for this
920 pub fn codegen_units(&self) -> usize {
921 if let Some(n) = self.opts.cli_forced_codegen_units {
924 if let Some(n) = self.target.default_codegen_units {
928 // If incremental compilation is turned on, we default to a high number
929 // codegen units in order to reduce the "collateral damage" small
931 if self.opts.incremental.is_some() {
935 // Why is 16 codegen units the default all the time?
937 // The main reason for enabling multiple codegen units by default is to
938 // leverage the ability for the codegen backend to do codegen and
939 // optimization in parallel. This allows us, especially for large crates, to
940 // make good use of all available resources on the machine once we've
941 // hit that stage of compilation. Large crates especially then often
942 // take a long time in codegen/optimization and this helps us amortize that
945 // Note that a high number here doesn't mean that we'll be spawning a
946 // large number of threads in parallel. The backend of rustc contains
947 // global rate limiting through the `jobserver` crate so we'll never
948 // overload the system with too much work, but rather we'll only be
949 // optimizing when we're otherwise cooperating with other instances of
952 // Rather a high number here means that we should be able to keep a lot
953 // of idle cpus busy. By ensuring that no codegen unit takes *too* long
954 // to build we'll be guaranteed that all cpus will finish pretty closely
955 // to one another and we should make relatively optimal use of system
958 // Note that the main cost of codegen units is that it prevents LLVM
959 // from inlining across codegen units. Users in general don't have a lot
960 // of control over how codegen units are split up so it's our job in the
961 // compiler to ensure that undue performance isn't lost when using
962 // codegen units (aka we can't require everyone to slap `#[inline]` on
965 // If we're compiling at `-O0` then the number doesn't really matter too
966 // much because performance doesn't matter and inlining is ok to lose.
967 // In debug mode we just want to try to guarantee that no cpu is stuck
968 // doing work that could otherwise be farmed to others.
970 // In release mode, however (O1 and above) performance does indeed
971 // matter! To recover the loss in performance due to inlining we'll be
972 // enabling ThinLTO by default (the function for which is just below).
973 // This will ensure that we recover any inlining wins we otherwise lost
974 // through codegen unit partitioning.
978 // Ok that's a lot of words but the basic tl;dr; is that we want a high
979 // number here -- but not too high. Additionally we're "safe" to have it
980 // always at the same number at all optimization levels.
982 // As a result 16 was chosen here! Mostly because it was a power of 2
983 // and most benchmarks agreed it was roughly a local optimum. Not very
988 pub fn teach(&self, code: &DiagnosticId) -> bool {
989 self.opts.debugging_opts.teach && self.diagnostic().must_teach(code)
992 pub fn rust_2015(&self) -> bool {
993 self.opts.edition == Edition::Edition2015
996 /// Are we allowed to use features from the Rust 2018 edition?
997 pub fn rust_2018(&self) -> bool {
998 self.opts.edition >= Edition::Edition2018
1001 /// Are we allowed to use features from the Rust 2021 edition?
1002 pub fn rust_2021(&self) -> bool {
1003 self.opts.edition >= Edition::Edition2021
1006 /// Are we allowed to use features from the Rust 2024 edition?
1007 pub fn rust_2024(&self) -> bool {
1008 self.opts.edition >= Edition::Edition2024
1011 pub fn edition(&self) -> Edition {
1015 /// Returns `true` if we cannot skip the PLT for shared library calls.
1016 pub fn needs_plt(&self) -> bool {
1017 // Check if the current target usually needs PLT to be enabled.
1018 // The user can use the command line flag to override it.
1019 let needs_plt = self.target.needs_plt;
1021 let dbg_opts = &self.opts.debugging_opts;
1023 let relro_level = dbg_opts.relro_level.unwrap_or(self.target.relro_level);
1025 // Only enable this optimization by default if full relro is also enabled.
1026 // In this case, lazy binding was already unavailable, so nothing is lost.
1027 // This also ensures `-Wl,-z,now` is supported by the linker.
1028 let full_relro = RelroLevel::Full == relro_level;
1030 // If user didn't explicitly forced us to use / skip the PLT,
1031 // then try to skip it where possible.
1032 dbg_opts.plt.unwrap_or(needs_plt || !full_relro)
1035 /// Checks if LLVM lifetime markers should be emitted.
1036 pub fn emit_lifetime_markers(&self) -> bool {
1037 self.opts.optimize != config::OptLevel::No
1038 // AddressSanitizer uses lifetimes to detect use after scope bugs.
1039 // MemorySanitizer uses lifetimes to detect use of uninitialized stack variables.
1040 // HWAddressSanitizer will use lifetimes to detect use after scope bugs in the future.
1041 || self.opts.debugging_opts.sanitizer.intersects(SanitizerSet::ADDRESS | SanitizerSet::MEMORY | SanitizerSet::HWADDRESS)
1044 pub fn link_dead_code(&self) -> bool {
1045 self.opts.cg.link_dead_code.unwrap_or(false)
1048 pub fn instrument_coverage(&self) -> bool {
1049 self.opts.instrument_coverage()
1052 pub fn instrument_coverage_except_unused_generics(&self) -> bool {
1053 self.opts.instrument_coverage_except_unused_generics()
1056 pub fn instrument_coverage_except_unused_functions(&self) -> bool {
1057 self.opts.instrument_coverage_except_unused_functions()
1060 pub fn is_proc_macro_attr(&self, attr: &Attribute) -> bool {
1061 [sym::proc_macro, sym::proc_macro_attribute, sym::proc_macro_derive]
1063 .any(|kind| attr.has_name(*kind))
1066 pub fn contains_name(&self, attrs: &[Attribute], name: Symbol) -> bool {
1067 attrs.iter().any(|item| item.has_name(name))
1070 pub fn find_by_name<'a>(
1072 attrs: &'a [Attribute],
1074 ) -> Option<&'a Attribute> {
1075 attrs.iter().find(|attr| attr.has_name(name))
1078 pub fn filter_by_name<'a>(
1080 attrs: &'a [Attribute],
1082 ) -> impl Iterator<Item = &'a Attribute> {
1083 attrs.iter().filter(move |attr| attr.has_name(name))
1086 pub fn first_attr_value_str_by_name(
1088 attrs: &[Attribute],
1090 ) -> Option<Symbol> {
1091 attrs.iter().find(|at| at.has_name(name)).and_then(|at| at.value_str())
1096 sopts: &config::Options,
1097 registry: rustc_errors::registry::Registry,
1098 source_map: Lrc<SourceMap>,
1099 bundle: Option<Lrc<FluentBundle>>,
1100 fallback_bundle: LazyFallbackBundle,
1101 emitter_dest: Option<Box<dyn Write + Send>>,
1102 ) -> Box<dyn Emitter + sync::Send> {
1103 let macro_backtrace = sopts.debugging_opts.macro_backtrace;
1104 match (sopts.error_format, emitter_dest) {
1105 (config::ErrorOutputType::HumanReadable(kind), dst) => {
1106 let (short, color_config) = kind.unzip();
1108 if let HumanReadableErrorType::AnnotateSnippet(_) = kind {
1109 let emitter = AnnotateSnippetEmitterWriter::new(
1116 Box::new(emitter.ui_testing(sopts.debugging_opts.ui_testing))
1118 let emitter = match dst {
1119 None => EmitterWriter::stderr(
1125 sopts.debugging_opts.teach,
1126 sopts.debugging_opts.terminal_width,
1129 Some(dst) => EmitterWriter::new(
1135 false, // no teach messages when writing to a buffer
1136 false, // no colors when writing to a buffer
1137 None, // no terminal width
1141 Box::new(emitter.ui_testing(sopts.debugging_opts.ui_testing))
1144 (config::ErrorOutputType::Json { pretty, json_rendered }, None) => Box::new(
1145 JsonEmitter::stderr(
1152 sopts.debugging_opts.terminal_width,
1155 .ui_testing(sopts.debugging_opts.ui_testing),
1157 (config::ErrorOutputType::Json { pretty, json_rendered }, Some(dst)) => Box::new(
1166 sopts.debugging_opts.terminal_width,
1169 .ui_testing(sopts.debugging_opts.ui_testing),
1174 pub enum DiagnosticOutput {
1176 Raw(Box<dyn Write + Send>),
1179 pub fn build_session(
1180 sopts: config::Options,
1181 local_crate_source_file: Option<PathBuf>,
1182 bundle: Option<Lrc<rustc_errors::FluentBundle>>,
1183 registry: rustc_errors::registry::Registry,
1184 diagnostics_output: DiagnosticOutput,
1185 driver_lint_caps: FxHashMap<lint::LintId, lint::Level>,
1186 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
1187 target_override: Option<Target>,
1189 // FIXME: This is not general enough to make the warning lint completely override
1190 // normal diagnostic warnings, since the warning lint can also be denied and changed
1191 // later via the source code.
1192 let warnings_allow = sopts
1195 .filter(|&&(ref key, _)| *key == "warnings")
1196 .map(|&(_, ref level)| *level == lint::Allow)
1199 let cap_lints_allow = sopts.lint_cap.map_or(false, |cap| cap == lint::Allow);
1200 let can_emit_warnings = !(warnings_allow || cap_lints_allow);
1202 let write_dest = match diagnostics_output {
1203 DiagnosticOutput::Default => None,
1204 DiagnosticOutput::Raw(write) => Some(write),
1207 let sysroot = match &sopts.maybe_sysroot {
1208 Some(sysroot) => sysroot.clone(),
1209 None => filesearch::get_or_default_sysroot(),
1212 let target_cfg = config::build_target_config(&sopts, target_override, &sysroot);
1213 let host_triple = TargetTriple::from_triple(config::host_triple());
1214 let (host, target_warnings) = Target::search(&host_triple, &sysroot).unwrap_or_else(|e| {
1215 early_error(sopts.error_format, &format!("Error loading host specification: {e}"))
1217 for warning in target_warnings.warning_messages() {
1218 early_warn(sopts.error_format, &warning)
1221 let loader = file_loader.unwrap_or_else(|| Box::new(RealFileLoader));
1222 let hash_kind = sopts.debugging_opts.src_hash_algorithm.unwrap_or_else(|| {
1223 if target_cfg.is_like_msvc {
1224 SourceFileHashAlgorithm::Sha1
1226 SourceFileHashAlgorithm::Md5
1229 let source_map = Lrc::new(SourceMap::with_file_loader_and_hash_kind(
1231 sopts.file_path_mapping(),
1235 let fallback_bundle = fallback_fluent_bundle(
1236 rustc_errors::DEFAULT_LOCALE_RESOURCES,
1237 sopts.debugging_opts.translate_directionality_markers,
1240 default_emitter(&sopts, registry, source_map.clone(), bundle, fallback_bundle, write_dest);
1242 let span_diagnostic = rustc_errors::Handler::with_emitter_and_flags(
1244 sopts.debugging_opts.diagnostic_handler_flags(can_emit_warnings),
1247 let self_profiler = if let SwitchWithOptPath::Enabled(ref d) = sopts.debugging_opts.self_profile
1250 if let Some(ref directory) = d { directory } else { std::path::Path::new(".") };
1252 let profiler = SelfProfiler::new(
1254 sopts.crate_name.as_deref(),
1255 &sopts.debugging_opts.self_profile_events,
1258 Ok(profiler) => Some(Arc::new(profiler)),
1260 early_warn(sopts.error_format, &format!("failed to create profiler: {e}"));
1268 let mut parse_sess = ParseSess::with_span_handler(span_diagnostic, source_map);
1269 parse_sess.assume_incomplete_release = sopts.debugging_opts.assume_incomplete_release;
1271 let host_triple = config::host_triple();
1272 let target_triple = sopts.target_triple.triple();
1273 let host_tlib_path = Lrc::new(SearchPath::from_sysroot_and_triple(&sysroot, host_triple));
1274 let target_tlib_path = if host_triple == target_triple {
1275 // Use the same `SearchPath` if host and target triple are identical to avoid unnecessary
1276 // rescanning of the target lib path and an unnecessary allocation.
1277 host_tlib_path.clone()
1279 Lrc::new(SearchPath::from_sysroot_and_triple(&sysroot, target_triple))
1282 let file_path_mapping = sopts.file_path_mapping();
1284 let local_crate_source_file =
1285 local_crate_source_file.map(|path| file_path_mapping.map_prefix(path).0);
1287 let optimization_fuel = Lock::new(OptimizationFuel {
1288 remaining: sopts.debugging_opts.fuel.as_ref().map_or(0, |i| i.1),
1291 let print_fuel = AtomicU64::new(0);
1293 let cgu_reuse_tracker = if sopts.debugging_opts.query_dep_graph {
1294 CguReuseTracker::new()
1296 CguReuseTracker::new_disabled()
1299 let prof = SelfProfilerRef::new(
1301 sopts.debugging_opts.time_passes || sopts.debugging_opts.time,
1302 sopts.debugging_opts.time_passes,
1305 let ctfe_backtrace = Lock::new(match env::var("RUSTC_CTFE_BACKTRACE") {
1306 Ok(ref val) if val == "immediate" => CtfeBacktrace::Immediate,
1307 Ok(ref val) if val != "0" => CtfeBacktrace::Capture,
1308 _ => CtfeBacktrace::Disabled,
1312 if target_cfg.allow_asm { InlineAsmArch::from_str(&target_cfg.arch).ok() } else { None };
1314 let sess = Session {
1322 local_crate_source_file,
1323 crate_types: OnceCell::new(),
1324 stable_crate_id: OnceCell::new(),
1325 features: OnceCell::new(),
1326 incr_comp_session: OneThread::new(RefCell::new(IncrCompSession::NotInitialized)),
1329 perf_stats: PerfStats {
1330 symbol_hash_time: Lock::new(Duration::from_secs(0)),
1331 queries_canonicalized: AtomicUsize::new(0),
1332 normalize_generic_arg_after_erasing_regions: AtomicUsize::new(0),
1333 normalize_projection_ty: AtomicUsize::new(0),
1335 code_stats: Default::default(),
1338 jobserver: jobserver::client(),
1341 miri_unleashed_features: Lock::new(Default::default()),
1343 target_features: FxHashSet::default(),
1346 validate_commandline_args_with_session_available(&sess);
1351 // If it is useful to have a Session available already for validating a
1352 // commandline argument, you can do so here.
1353 fn validate_commandline_args_with_session_available(sess: &Session) {
1354 // Since we don't know if code in an rlib will be linked to statically or
1355 // dynamically downstream, rustc generates `__imp_` symbols that help linkers
1356 // on Windows deal with this lack of knowledge (#27438). Unfortunately,
1357 // these manually generated symbols confuse LLD when it tries to merge
1358 // bitcode during ThinLTO. Therefore we disallow dynamic linking on Windows
1359 // when compiling for LLD ThinLTO. This way we can validly just not generate
1360 // the `dllimport` attributes and `__imp_` symbols in that case.
1361 if sess.opts.cg.linker_plugin_lto.enabled()
1362 && sess.opts.cg.prefer_dynamic
1363 && sess.target.is_like_windows
1366 "Linker plugin based LTO is not supported together with \
1367 `-C prefer-dynamic` when targeting Windows-like targets",
1371 // Make sure that any given profiling data actually exists so LLVM can't
1372 // decide to silently skip PGO.
1373 if let Some(ref path) = sess.opts.cg.profile_use {
1376 "File `{}` passed to `-C profile-use` does not exist.",
1382 // Do the same for sample profile data.
1383 if let Some(ref path) = sess.opts.debugging_opts.profile_sample_use {
1386 "File `{}` passed to `-C profile-sample-use` does not exist.",
1392 // Unwind tables cannot be disabled if the target requires them.
1393 if let Some(include_uwtables) = sess.opts.cg.force_unwind_tables {
1394 if sess.target.requires_uwtable && !include_uwtables {
1396 "target requires unwind tables, they cannot be disabled with \
1397 `-C force-unwind-tables=no`.",
1402 // Sanitizers can only be used on platforms that we know have working sanitizer codegen.
1403 let supported_sanitizers = sess.target.options.supported_sanitizers;
1404 let unsupported_sanitizers = sess.opts.debugging_opts.sanitizer - supported_sanitizers;
1405 match unsupported_sanitizers.into_iter().count() {
1409 "{} sanitizer is not supported for this target",
1410 unsupported_sanitizers
1415 "{} sanitizers are not supported for this target",
1416 unsupported_sanitizers
1420 // Cannot mix and match sanitizers.
1421 let mut sanitizer_iter = sess.opts.debugging_opts.sanitizer.into_iter();
1422 if let (Some(first), Some(second)) = (sanitizer_iter.next(), sanitizer_iter.next()) {
1423 sess.err(&format!("`-Zsanitizer={first}` is incompatible with `-Zsanitizer={second}`"));
1426 // Cannot enable crt-static with sanitizers on Linux
1427 if sess.crt_static(None) && !sess.opts.debugging_opts.sanitizer.is_empty() {
1429 "sanitizer is incompatible with statically linked libc, \
1430 disable it using `-C target-feature=-crt-static`",
1434 // LLVM CFI requires LTO.
1435 if sess.is_sanitizer_cfi_enabled() {
1436 if sess.opts.cg.lto == config::LtoCli::Unspecified
1437 || sess.opts.cg.lto == config::LtoCli::No
1438 || sess.opts.cg.lto == config::LtoCli::Thin
1440 sess.err("`-Zsanitizer=cfi` requires `-Clto`");
1444 if sess.opts.debugging_opts.stack_protector != StackProtector::None {
1445 if !sess.target.options.supports_stack_protector {
1447 "`-Z stack-protector={}` is not supported for target {} and will be ignored",
1448 sess.opts.debugging_opts.stack_protector, sess.opts.target_triple
1454 /// Holds data on the current incremental compilation session, if there is one.
1456 pub enum IncrCompSession {
1457 /// This is the state the session will be in until the incr. comp. dir is
1460 /// This is the state during which the session directory is private and can
1462 Active { session_directory: PathBuf, lock_file: flock::Lock, load_dep_graph: bool },
1463 /// This is the state after the session directory has been finalized. In this
1464 /// state, the contents of the directory must not be modified any more.
1465 Finalized { session_directory: PathBuf },
1466 /// This is an error state that is reached when some compilation error has
1467 /// occurred. It indicates that the contents of the session directory must
1468 /// not be used, since they might be invalid.
1469 InvalidBecauseOfErrors { session_directory: PathBuf },
1472 fn early_error_handler(output: config::ErrorOutputType) -> rustc_errors::Handler {
1473 let fallback_bundle = fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
1474 let emitter: Box<dyn Emitter + sync::Send> = match output {
1475 config::ErrorOutputType::HumanReadable(kind) => {
1476 let (short, color_config) = kind.unzip();
1477 Box::new(EmitterWriter::stderr(
1488 config::ErrorOutputType::Json { pretty, json_rendered } => {
1489 Box::new(JsonEmitter::basic(pretty, json_rendered, None, fallback_bundle, None, false))
1492 rustc_errors::Handler::with_emitter(true, None, emitter)
1495 pub fn early_error_no_abort(output: config::ErrorOutputType, msg: &str) -> ErrorGuaranteed {
1496 early_error_handler(output).struct_err(msg).emit()
1499 pub fn early_error(output: config::ErrorOutputType, msg: &str) -> ! {
1500 early_error_handler(output).struct_fatal(msg).emit()
1503 pub fn early_warn(output: config::ErrorOutputType, msg: &str) {
1504 early_error_handler(output).struct_warn(msg).emit()