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;
22 use rustc_errors::{Diagnostic, DiagnosticBuilder, DiagnosticId, ErrorGuaranteed};
23 use rustc_macros::HashStable_Generic;
24 pub use rustc_span::def_id::StableCrateId;
25 use rustc_span::edition::Edition;
26 use rustc_span::source_map::{FileLoader, MultiSpan, RealFileLoader, SourceMap, Span};
27 use rustc_span::{sym, SourceFileHashAlgorithm, Symbol};
28 use rustc_target::asm::InlineAsmArch;
29 use rustc_target::spec::{CodeModel, PanicStrategy, RelocModel, RelroLevel};
30 use rustc_target::spec::{
31 SanitizerSet, SplitDebuginfo, StackProtector, Target, TargetTriple, TlsModel,
34 use std::cell::{self, RefCell};
38 use std::num::NonZeroU32;
39 use std::ops::{Div, Mul};
40 use std::path::{Path, PathBuf};
41 use std::str::FromStr;
43 use std::time::Duration;
45 pub struct OptimizationFuel {
46 /// If `-zfuel=crate=n` is specified, initially set to `n`, otherwise `0`.
48 /// We're rejecting all further optimizations.
52 /// The behavior of the CTFE engine when an error occurs with regards to backtraces.
53 #[derive(Clone, Copy)]
54 pub enum CtfeBacktrace {
55 /// Do nothing special, return the error as usual without a backtrace.
57 /// Capture a backtrace at the point the error is created and return it in the error
58 /// (to be printed later if/when the error ever actually gets shown to the user).
60 /// Capture a backtrace at the point the error is created and immediately print it out.
64 /// New-type wrapper around `usize` for representing limits. Ensures that comparisons against
65 /// limits are consistent throughout the compiler.
66 #[derive(Clone, Copy, Debug, HashStable_Generic)]
67 pub struct Limit(pub usize);
70 /// Create a new limit from a `usize`.
71 pub fn new(value: usize) -> Self {
75 /// Check that `value` is within the limit. Ensures that the same comparisons are used
76 /// throughout the compiler, as mismatches can cause ICEs, see #72540.
78 pub fn value_within_limit(&self, value: usize) -> bool {
83 impl From<usize> for Limit {
84 fn from(value: usize) -> Self {
89 impl fmt::Display for Limit {
90 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
91 write!(f, "{}", self.0)
95 impl Div<usize> for Limit {
98 fn div(self, rhs: usize) -> Self::Output {
99 Limit::new(self.0 / rhs)
103 impl Mul<usize> for Limit {
106 fn mul(self, rhs: usize) -> Self::Output {
107 Limit::new(self.0 * rhs)
111 #[derive(Clone, Copy, Debug, HashStable_Generic)]
113 /// The maximum recursion limit for potentially infinitely recursive
114 /// operations such as auto-dereference and monomorphization.
115 pub recursion_limit: Limit,
116 /// The size at which the `large_assignments` lint starts
118 pub move_size_limit: Limit,
119 /// The maximum length of types during monomorphization.
120 pub type_length_limit: Limit,
121 /// The maximum blocks a const expression can evaluate.
122 pub const_eval_limit: Limit,
125 /// Represents the data associated with a compilation
126 /// session for a single crate.
130 pub opts: config::Options,
131 pub host_tlib_path: Lrc<SearchPath>,
132 pub target_tlib_path: Lrc<SearchPath>,
133 pub parse_sess: ParseSess,
134 pub sysroot: PathBuf,
135 /// The name of the root source file of the crate, in the local file system.
136 /// `None` means that there is no source file.
137 pub local_crate_source_file: Option<PathBuf>,
139 /// Set of `(DiagnosticId, Option<Span>, message)` tuples tracking
140 /// (sub)diagnostics that have been set once, but should not be set again,
141 /// in order to avoid redundantly verbose output (Issue #24690, #44953).
142 pub one_time_diagnostics: Lock<FxHashSet<(DiagnosticMessageId, Option<Span>, String)>>,
143 crate_types: OnceCell<Vec<CrateType>>,
144 /// The `stable_crate_id` is constructed out of the crate name and all the
145 /// `-C metadata` arguments passed to the compiler. Its value forms a unique
146 /// global identifier for the crate. It is used to allow multiple crates
147 /// with the same name to coexist. See the
148 /// `rustc_codegen_llvm::back::symbol_names` module for more information.
149 pub stable_crate_id: OnceCell<StableCrateId>,
151 features: OnceCell<rustc_feature::Features>,
153 incr_comp_session: OneThread<RefCell<IncrCompSession>>,
154 /// Used for incremental compilation tests. Will only be populated if
155 /// `-Zquery-dep-graph` is specified.
156 pub cgu_reuse_tracker: CguReuseTracker,
158 /// Used by `-Z self-profile`.
159 pub prof: SelfProfilerRef,
161 /// Some measurements that are being gathered during compilation.
162 pub perf_stats: PerfStats,
164 /// Data about code being compiled, gathered during compilation.
165 pub code_stats: CodeStats,
167 /// Tracks fuel info if `-zfuel=crate=n` is specified.
168 optimization_fuel: Lock<OptimizationFuel>,
170 /// Always set to zero and incremented so that we can print fuel expended by a crate.
171 pub print_fuel: AtomicU64,
173 /// Loaded up early on in the initialization of this `Session` to avoid
174 /// false positives about a job server in our environment.
175 pub jobserver: Client,
177 /// Cap lint level specified by a driver specifically.
178 pub driver_lint_caps: FxHashMap<lint::LintId, lint::Level>,
180 /// Tracks the current behavior of the CTFE engine when an error occurs.
181 /// Options range from returning the error without a backtrace to returning an error
182 /// and immediately printing the backtrace to stderr.
183 /// The `Lock` is only used by miri to allow setting `ctfe_backtrace` after analysis when
184 /// `MIRI_BACKTRACE` is set. This makes it only apply to miri's errors and not to all CTFE
186 pub ctfe_backtrace: Lock<CtfeBacktrace>,
188 /// This tracks where `-Zunleash-the-miri-inside-of-you` was used to get around a
189 /// const check, optionally with the relevant feature gate. We use this to
190 /// warn about unleashing, but with a single diagnostic instead of dozens that
191 /// drown everything else in noise.
192 miri_unleashed_features: Lock<Vec<(Span, Option<Symbol>)>>,
194 /// Architecture to use for interpreting asm!.
195 pub asm_arch: Option<InlineAsmArch>,
197 /// Set of enabled features for the current target.
198 pub target_features: FxHashSet<Symbol>,
201 pub struct PerfStats {
202 /// The accumulated time spent on computing symbol hashes.
203 pub symbol_hash_time: Lock<Duration>,
204 /// Total number of values canonicalized queries constructed.
205 pub queries_canonicalized: AtomicUsize,
206 /// Number of times this query is invoked.
207 pub normalize_generic_arg_after_erasing_regions: AtomicUsize,
208 /// Number of times this query is invoked.
209 pub normalize_projection_ty: AtomicUsize,
212 /// Enum to support dispatch of one-time diagnostics (in `Session.diag_once`).
213 enum DiagnosticBuilderMethod {
216 // Add more variants as needed to support one-time diagnostics.
219 /// Trait implemented by error types. This should not be implemented manually. Instead, use
220 /// `#[derive(SessionDiagnostic)]` -- see [rustc_macros::SessionDiagnostic].
221 pub trait SessionDiagnostic<'a> {
222 /// Write out as a diagnostic out of `sess`.
224 fn into_diagnostic(self, sess: &'a Session) -> DiagnosticBuilder<'a, ErrorGuaranteed>;
227 /// Diagnostic message ID, used by `Session.one_time_diagnostics` to avoid
228 /// emitting the same message more than once.
229 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
230 pub enum DiagnosticMessageId {
231 ErrorId(u16), // EXXXX error code as integer
232 LintId(lint::LintId),
233 StabilityId(Option<NonZeroU32>), // issue number
236 impl From<&'static lint::Lint> for DiagnosticMessageId {
237 fn from(lint: &'static lint::Lint) -> Self {
238 DiagnosticMessageId::LintId(lint::LintId::of(lint))
243 pub fn miri_unleashed_feature(&self, span: Span, feature_gate: Option<Symbol>) {
244 self.miri_unleashed_features.lock().push((span, feature_gate));
247 fn check_miri_unleashed_features(&self) {
248 let unleashed_features = self.miri_unleashed_features.lock();
249 if !unleashed_features.is_empty() {
250 let mut must_err = false;
251 // Create a diagnostic pointing at where things got unleashed.
252 let mut diag = self.struct_warn("skipping const checks");
253 for &(span, feature_gate) in unleashed_features.iter() {
254 // FIXME: `span_label` doesn't do anything, so we use "help" as a hack.
255 if let Some(feature_gate) = feature_gate {
256 diag.span_help(span, &format!("skipping check for `{}` feature", feature_gate));
257 // The unleash flag must *not* be used to just "hack around" feature gates.
260 diag.span_help(span, "skipping check that does not even have a feature gate");
264 // If we should err, make sure we did.
265 if must_err && !self.has_errors() {
266 // We have skipped a feature gate, and not run into other errors... reject.
268 "`-Zunleash-the-miri-inside-of-you` may not be used to circumvent feature \
269 gates, except when testing error paths in the CTFE engine",
275 /// Invoked all the way at the end to finish off diagnostics printing.
276 pub fn finish_diagnostics(&self, registry: &Registry) {
277 self.check_miri_unleashed_features();
278 self.diagnostic().print_error_count(registry);
279 self.emit_future_breakage();
282 fn emit_future_breakage(&self) {
283 if !self.opts.json_future_incompat {
287 let diags = self.diagnostic().take_future_breakage_diagnostics();
288 if diags.is_empty() {
291 self.parse_sess.span_diagnostic.emit_future_breakage_report(diags);
294 pub fn local_stable_crate_id(&self) -> StableCrateId {
295 self.stable_crate_id.get().copied().unwrap()
298 pub fn crate_types(&self) -> &[CrateType] {
299 self.crate_types.get().unwrap().as_slice()
302 pub fn init_crate_types(&self, crate_types: Vec<CrateType>) {
303 self.crate_types.set(crate_types).expect("`crate_types` was initialized twice")
306 pub fn struct_span_warn<S: Into<MultiSpan>>(
310 ) -> DiagnosticBuilder<'_, ()> {
311 self.diagnostic().struct_span_warn(sp, msg)
313 pub fn struct_span_warn_with_code<S: Into<MultiSpan>>(
318 ) -> DiagnosticBuilder<'_, ()> {
319 self.diagnostic().struct_span_warn_with_code(sp, msg, code)
321 pub fn struct_warn(&self, msg: &str) -> DiagnosticBuilder<'_, ()> {
322 self.diagnostic().struct_warn(msg)
324 pub fn struct_span_allow<S: Into<MultiSpan>>(
328 ) -> DiagnosticBuilder<'_, ()> {
329 self.diagnostic().struct_span_allow(sp, msg)
331 pub fn struct_allow(&self, msg: &str) -> DiagnosticBuilder<'_, ()> {
332 self.diagnostic().struct_allow(msg)
334 pub fn struct_expect(
337 id: lint::LintExpectationId,
338 ) -> DiagnosticBuilder<'_, ()> {
339 self.diagnostic().struct_expect(msg, id)
341 pub fn struct_span_err<S: Into<MultiSpan>>(
345 ) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
346 self.diagnostic().struct_span_err(sp, msg)
348 pub fn struct_span_err_with_code<S: Into<MultiSpan>>(
353 ) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
354 self.diagnostic().struct_span_err_with_code(sp, msg, code)
356 // FIXME: This method should be removed (every error should have an associated error code).
357 pub fn struct_err(&self, msg: &str) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
358 self.diagnostic().struct_err(msg)
360 pub fn struct_err_with_code(
364 ) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
365 self.diagnostic().struct_err_with_code(msg, code)
367 pub fn struct_span_fatal<S: Into<MultiSpan>>(
371 ) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
372 self.diagnostic().struct_span_fatal(sp, msg)
374 pub fn struct_span_fatal_with_code<S: Into<MultiSpan>>(
379 ) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
380 self.diagnostic().struct_span_fatal_with_code(sp, msg, code)
382 pub fn struct_fatal(&self, msg: &str) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
383 self.diagnostic().struct_fatal(msg)
386 pub fn span_fatal<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> ! {
387 self.diagnostic().span_fatal(sp, msg)
389 pub fn span_fatal_with_code<S: Into<MultiSpan>>(
395 self.diagnostic().span_fatal_with_code(sp, msg, code)
397 pub fn fatal(&self, msg: &str) -> ! {
398 self.diagnostic().fatal(msg).raise()
400 pub fn span_err_or_warn<S: Into<MultiSpan>>(&self, is_warning: bool, sp: S, msg: &str) {
402 self.span_warn(sp, msg);
404 self.span_err(sp, msg);
407 pub fn span_err<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
408 self.diagnostic().span_err(sp, msg)
410 pub fn span_err_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: DiagnosticId) {
411 self.diagnostic().span_err_with_code(sp, &msg, code)
413 pub fn err(&self, msg: &str) {
414 self.diagnostic().err(msg)
416 pub fn emit_err<'a>(&'a self, err: impl SessionDiagnostic<'a>) -> ErrorGuaranteed {
417 err.into_diagnostic(self).emit()
420 pub fn err_count(&self) -> usize {
421 self.diagnostic().err_count()
423 pub fn has_errors(&self) -> bool {
424 self.diagnostic().has_errors()
426 pub fn has_errors_or_delayed_span_bugs(&self) -> bool {
427 self.diagnostic().has_errors_or_delayed_span_bugs()
429 pub fn abort_if_errors(&self) {
430 self.diagnostic().abort_if_errors();
432 pub fn compile_status(&self) -> Result<(), ErrorGuaranteed> {
433 if self.diagnostic().has_errors_or_lint_errors() {
434 self.diagnostic().emit_stashed_diagnostics();
440 // FIXME(matthewjasper) Remove this method, it should never be needed.
441 pub fn track_errors<F, T>(&self, f: F) -> Result<T, ErrorGuaranteed>
445 let old_count = self.err_count();
447 if self.err_count() == old_count { Ok(result) } else { Err(ErrorGuaranteed) }
449 pub fn span_warn<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
450 self.diagnostic().span_warn(sp, msg)
452 pub fn span_warn_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: DiagnosticId) {
453 self.diagnostic().span_warn_with_code(sp, msg, code)
455 pub fn warn(&self, msg: &str) {
456 self.diagnostic().warn(msg)
458 /// Delay a span_bug() call until abort_if_errors()
460 pub fn delay_span_bug<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
461 self.diagnostic().delay_span_bug(sp, msg)
464 /// Used for code paths of expensive computations that should only take place when
465 /// warnings or errors are emitted. If no messages are emitted ("good path"), then
466 /// it's likely a bug.
467 pub fn delay_good_path_bug(&self, msg: &str) {
468 if self.opts.debugging_opts.print_type_sizes
469 || self.opts.debugging_opts.query_dep_graph
470 || self.opts.debugging_opts.dump_mir.is_some()
471 || self.opts.debugging_opts.unpretty.is_some()
472 || self.opts.output_types.contains_key(&OutputType::Mir)
473 || std::env::var_os("RUSTC_LOG").is_some()
478 self.diagnostic().delay_good_path_bug(msg)
481 pub fn note_without_error(&self, msg: &str) {
482 self.diagnostic().note_without_error(msg)
484 pub fn span_note_without_error<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
485 self.diagnostic().span_note_without_error(sp, msg)
487 pub fn struct_note_without_error(&self, msg: &str) -> DiagnosticBuilder<'_, ()> {
488 self.diagnostic().struct_note_without_error(msg)
492 pub fn diagnostic(&self) -> &rustc_errors::Handler {
493 &self.parse_sess.span_diagnostic
496 /// Analogous to calling methods on the given `DiagnosticBuilder`, but
497 /// deduplicates on lint ID, span (if any), and message for this `Session`
500 diag: &mut Diagnostic,
501 method: DiagnosticBuilderMethod,
502 msg_id: DiagnosticMessageId,
504 span_maybe: Option<Span>,
506 let id_span_message = (msg_id, span_maybe, message.to_owned());
507 let fresh = self.one_time_diagnostics.borrow_mut().insert(id_span_message);
510 DiagnosticBuilderMethod::Note => {
513 DiagnosticBuilderMethod::SpanNote => {
514 let span = span_maybe.expect("`span_note` needs a span");
515 diag.span_note(span, message);
521 pub fn diag_span_note_once(
523 diag: &mut Diagnostic,
524 msg_id: DiagnosticMessageId,
528 self.diag_once(diag, DiagnosticBuilderMethod::SpanNote, msg_id, message, Some(span));
531 pub fn diag_note_once(
533 diag: &mut Diagnostic,
534 msg_id: DiagnosticMessageId,
537 self.diag_once(diag, DiagnosticBuilderMethod::Note, msg_id, message, None);
541 pub fn source_map(&self) -> &SourceMap {
542 self.parse_sess.source_map()
544 pub fn verbose(&self) -> bool {
545 self.opts.debugging_opts.verbose
547 pub fn time_passes(&self) -> bool {
548 self.opts.debugging_opts.time_passes || self.opts.debugging_opts.time
550 pub fn instrument_mcount(&self) -> bool {
551 self.opts.debugging_opts.instrument_mcount
553 pub fn time_llvm_passes(&self) -> bool {
554 self.opts.debugging_opts.time_llvm_passes
556 pub fn meta_stats(&self) -> bool {
557 self.opts.debugging_opts.meta_stats
559 pub fn asm_comments(&self) -> bool {
560 self.opts.debugging_opts.asm_comments
562 pub fn verify_llvm_ir(&self) -> bool {
563 self.opts.debugging_opts.verify_llvm_ir || option_env!("RUSTC_VERIFY_LLVM_IR").is_some()
565 pub fn print_llvm_passes(&self) -> bool {
566 self.opts.debugging_opts.print_llvm_passes
568 pub fn binary_dep_depinfo(&self) -> bool {
569 self.opts.debugging_opts.binary_dep_depinfo
571 pub fn mir_opt_level(&self) -> usize {
572 self.opts.mir_opt_level()
575 /// Gets the features enabled for the current compilation session.
576 /// DO NOT USE THIS METHOD if there is a TyCtxt available, as it circumvents
577 /// dependency tracking. Use tcx.features() instead.
579 pub fn features_untracked(&self) -> &rustc_feature::Features {
580 self.features.get().unwrap()
583 pub fn init_features(&self, features: rustc_feature::Features) {
584 match self.features.set(features) {
586 Err(_) => panic!("`features` was initialized twice"),
590 /// Calculates the flavor of LTO to use for this compilation.
591 pub fn lto(&self) -> config::Lto {
592 // If our target has codegen requirements ignore the command line
593 if self.target.requires_lto {
594 return config::Lto::Fat;
597 // If the user specified something, return that. If they only said `-C
598 // lto` and we've for whatever reason forced off ThinLTO via the CLI,
599 // then ensure we can't use a ThinLTO.
600 match self.opts.cg.lto {
601 config::LtoCli::Unspecified => {
602 // The compiler was invoked without the `-Clto` flag. Fall
603 // through to the default handling
605 config::LtoCli::No => {
606 // The user explicitly opted out of any kind of LTO
607 return config::Lto::No;
609 config::LtoCli::Yes | config::LtoCli::Fat | config::LtoCli::NoParam => {
610 // All of these mean fat LTO
611 return config::Lto::Fat;
613 config::LtoCli::Thin => {
614 return if self.opts.cli_forced_thinlto_off {
622 // Ok at this point the target doesn't require anything and the user
623 // hasn't asked for anything. Our next decision is whether or not
624 // we enable "auto" ThinLTO where we use multiple codegen units and
625 // then do ThinLTO over those codegen units. The logic below will
626 // either return `No` or `ThinLocal`.
628 // If processing command line options determined that we're incompatible
629 // with ThinLTO (e.g., `-C lto --emit llvm-ir`) then return that option.
630 if self.opts.cli_forced_thinlto_off {
631 return config::Lto::No;
634 // If `-Z thinlto` specified process that, but note that this is mostly
635 // a deprecated option now that `-C lto=thin` exists.
636 if let Some(enabled) = self.opts.debugging_opts.thinlto {
638 return config::Lto::ThinLocal;
640 return config::Lto::No;
644 // If there's only one codegen unit and LTO isn't enabled then there's
645 // no need for ThinLTO so just return false.
646 if self.codegen_units() == 1 {
647 return config::Lto::No;
650 // Now we're in "defaults" territory. By default we enable ThinLTO for
651 // optimized compiles (anything greater than O0).
652 match self.opts.optimize {
653 config::OptLevel::No => config::Lto::No,
654 _ => config::Lto::ThinLocal,
658 /// Returns the panic strategy for this compile session. If the user explicitly selected one
659 /// using '-C panic', use that, otherwise use the panic strategy defined by the target.
660 pub fn panic_strategy(&self) -> PanicStrategy {
661 self.opts.cg.panic.unwrap_or(self.target.panic_strategy)
663 pub fn fewer_names(&self) -> bool {
664 if let Some(fewer_names) = self.opts.debugging_opts.fewer_names {
667 let more_names = self.opts.output_types.contains_key(&OutputType::LlvmAssembly)
668 || self.opts.output_types.contains_key(&OutputType::Bitcode)
669 // AddressSanitizer and MemorySanitizer use alloca name when reporting an issue.
670 || self.opts.debugging_opts.sanitizer.intersects(SanitizerSet::ADDRESS | SanitizerSet::MEMORY);
675 pub fn unstable_options(&self) -> bool {
676 self.opts.debugging_opts.unstable_options
678 pub fn is_nightly_build(&self) -> bool {
679 self.opts.unstable_features.is_nightly_build()
681 pub fn is_sanitizer_cfi_enabled(&self) -> bool {
682 self.opts.debugging_opts.sanitizer.contains(SanitizerSet::CFI)
684 pub fn overflow_checks(&self) -> bool {
685 self.opts.cg.overflow_checks.unwrap_or(self.opts.debug_assertions)
688 /// Check whether this compile session and crate type use static crt.
689 pub fn crt_static(&self, crate_type: Option<CrateType>) -> bool {
690 if !self.target.crt_static_respected {
691 // If the target does not opt in to crt-static support, use its default.
692 return self.target.crt_static_default;
695 let requested_features = self.opts.cg.target_feature.split(',');
696 let found_negative = requested_features.clone().any(|r| r == "-crt-static");
697 let found_positive = requested_features.clone().any(|r| r == "+crt-static");
699 if found_positive || found_negative {
701 } else if crate_type == Some(CrateType::ProcMacro)
702 || crate_type == None && self.opts.crate_types.contains(&CrateType::ProcMacro)
704 // FIXME: When crate_type is not available,
705 // we use compiler options to determine the crate_type.
706 // We can't check `#![crate_type = "proc-macro"]` here.
709 self.target.crt_static_default
713 pub fn relocation_model(&self) -> RelocModel {
714 self.opts.cg.relocation_model.unwrap_or(self.target.relocation_model)
717 pub fn code_model(&self) -> Option<CodeModel> {
718 self.opts.cg.code_model.or(self.target.code_model)
721 pub fn tls_model(&self) -> TlsModel {
722 self.opts.debugging_opts.tls_model.unwrap_or(self.target.tls_model)
725 pub fn is_wasi_reactor(&self) -> bool {
726 self.target.options.os == "wasi"
728 self.opts.debugging_opts.wasi_exec_model,
729 Some(config::WasiExecModel::Reactor)
733 pub fn split_debuginfo(&self) -> SplitDebuginfo {
734 self.opts.cg.split_debuginfo.unwrap_or(self.target.split_debuginfo)
737 pub fn stack_protector(&self) -> StackProtector {
738 if self.target.options.supports_stack_protector {
739 self.opts.debugging_opts.stack_protector
745 pub fn target_can_use_split_dwarf(&self) -> bool {
746 !self.target.is_like_windows && !self.target.is_like_osx
749 pub fn must_emit_unwind_tables(&self) -> bool {
750 // This is used to control the emission of the `uwtable` attribute on
753 // Unwind tables are needed when compiling with `-C panic=unwind`, but
754 // LLVM won't omit unwind tables unless the function is also marked as
755 // `nounwind`, so users are allowed to disable `uwtable` emission.
756 // Historically rustc always emits `uwtable` attributes by default, so
757 // even they can be disabled, they're still emitted by default.
759 // On some targets (including windows), however, exceptions include
760 // other events such as illegal instructions, segfaults, etc. This means
761 // that on Windows we end up still needing unwind tables even if the `-C
762 // panic=abort` flag is passed.
764 // You can also find more info on why Windows needs unwind tables in:
765 // https://bugzilla.mozilla.org/show_bug.cgi?id=1302078
767 // If a target requires unwind tables, then they must be emitted.
768 // Otherwise, we can defer to the `-C force-unwind-tables=<yes/no>`
769 // value, if it is provided, or disable them, if not.
770 self.target.requires_uwtable
771 || self.opts.cg.force_unwind_tables.unwrap_or(
772 self.panic_strategy() == PanicStrategy::Unwind || self.target.default_uwtable,
776 pub fn generate_proc_macro_decls_symbol(&self, stable_crate_id: StableCrateId) -> String {
777 format!("__rustc_proc_macro_decls_{:08x}__", stable_crate_id.to_u64())
780 pub fn target_filesearch(&self, kind: PathKind) -> filesearch::FileSearch<'_> {
781 filesearch::FileSearch::new(
783 self.opts.target_triple.triple(),
784 &self.opts.search_paths,
785 &self.target_tlib_path,
789 pub fn host_filesearch(&self, kind: PathKind) -> filesearch::FileSearch<'_> {
790 filesearch::FileSearch::new(
792 config::host_triple(),
793 &self.opts.search_paths,
794 &self.host_tlib_path,
799 /// Returns a list of directories where target-specific tool binaries are located.
800 pub fn get_tools_search_paths(&self, self_contained: bool) -> Vec<PathBuf> {
801 let rustlib_path = rustc_target::target_rustlib_path(&self.sysroot, &config::host_triple());
802 let p = PathBuf::from_iter([
803 Path::new(&self.sysroot),
804 Path::new(&rustlib_path),
807 if self_contained { vec![p.clone(), p.join("self-contained")] } else { vec![p] }
810 pub fn init_incr_comp_session(
812 session_dir: PathBuf,
813 lock_file: flock::Lock,
814 load_dep_graph: bool,
816 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
818 if let IncrCompSession::NotInitialized = *incr_comp_session {
820 panic!("Trying to initialize IncrCompSession `{:?}`", *incr_comp_session)
824 IncrCompSession::Active { session_directory: session_dir, lock_file, load_dep_graph };
827 pub fn finalize_incr_comp_session(&self, new_directory_path: PathBuf) {
828 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
830 if let IncrCompSession::Active { .. } = *incr_comp_session {
832 panic!("trying to finalize `IncrCompSession` `{:?}`", *incr_comp_session);
835 // Note: this will also drop the lock file, thus unlocking the directory.
836 *incr_comp_session = IncrCompSession::Finalized { session_directory: new_directory_path };
839 pub fn mark_incr_comp_session_as_invalid(&self) {
840 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
842 let session_directory = match *incr_comp_session {
843 IncrCompSession::Active { ref session_directory, .. } => session_directory.clone(),
844 IncrCompSession::InvalidBecauseOfErrors { .. } => return,
845 _ => panic!("trying to invalidate `IncrCompSession` `{:?}`", *incr_comp_session),
848 // Note: this will also drop the lock file, thus unlocking the directory.
849 *incr_comp_session = IncrCompSession::InvalidBecauseOfErrors { session_directory };
852 pub fn incr_comp_session_dir(&self) -> cell::Ref<'_, PathBuf> {
853 let incr_comp_session = self.incr_comp_session.borrow();
854 cell::Ref::map(incr_comp_session, |incr_comp_session| match *incr_comp_session {
855 IncrCompSession::NotInitialized => panic!(
856 "trying to get session directory from `IncrCompSession`: {:?}",
859 IncrCompSession::Active { ref session_directory, .. }
860 | IncrCompSession::Finalized { ref session_directory }
861 | IncrCompSession::InvalidBecauseOfErrors { ref session_directory } => {
867 pub fn incr_comp_session_dir_opt(&self) -> Option<cell::Ref<'_, PathBuf>> {
868 self.opts.incremental.as_ref().map(|_| self.incr_comp_session_dir())
871 pub fn print_perf_stats(&self) {
873 "Total time spent computing symbol hashes: {}",
874 duration_to_secs_str(*self.perf_stats.symbol_hash_time.lock())
877 "Total queries canonicalized: {}",
878 self.perf_stats.queries_canonicalized.load(Ordering::Relaxed)
881 "normalize_generic_arg_after_erasing_regions: {}",
882 self.perf_stats.normalize_generic_arg_after_erasing_regions.load(Ordering::Relaxed)
885 "normalize_projection_ty: {}",
886 self.perf_stats.normalize_projection_ty.load(Ordering::Relaxed)
890 /// We want to know if we're allowed to do an optimization for crate foo from -z fuel=foo=n.
891 /// This expends fuel if applicable, and records fuel if applicable.
892 pub fn consider_optimizing<T: Fn() -> String>(&self, crate_name: &str, msg: T) -> bool {
894 if let Some((ref c, _)) = self.opts.debugging_opts.fuel {
896 assert_eq!(self.threads(), 1);
897 let mut fuel = self.optimization_fuel.lock();
898 ret = fuel.remaining != 0;
899 if fuel.remaining == 0 && !fuel.out_of_fuel {
900 if self.diagnostic().can_emit_warnings() {
901 // We only call `msg` in case we can actually emit warnings.
902 // Otherwise, this could cause a `delay_good_path_bug` to
903 // trigger (issue #79546).
904 self.warn(&format!("optimization-fuel-exhausted: {}", msg()));
906 fuel.out_of_fuel = true;
907 } else if fuel.remaining > 0 {
912 if let Some(ref c) = self.opts.debugging_opts.print_fuel {
914 assert_eq!(self.threads(), 1);
915 self.print_fuel.fetch_add(1, SeqCst);
921 /// Returns the number of query threads that should be used for this
923 pub fn threads(&self) -> usize {
924 self.opts.debugging_opts.threads
927 /// Returns the number of codegen units that should be used for this
929 pub fn codegen_units(&self) -> usize {
930 if let Some(n) = self.opts.cli_forced_codegen_units {
933 if let Some(n) = self.target.default_codegen_units {
937 // If incremental compilation is turned on, we default to a high number
938 // codegen units in order to reduce the "collateral damage" small
940 if self.opts.incremental.is_some() {
944 // Why is 16 codegen units the default all the time?
946 // The main reason for enabling multiple codegen units by default is to
947 // leverage the ability for the codegen backend to do codegen and
948 // optimization in parallel. This allows us, especially for large crates, to
949 // make good use of all available resources on the machine once we've
950 // hit that stage of compilation. Large crates especially then often
951 // take a long time in codegen/optimization and this helps us amortize that
954 // Note that a high number here doesn't mean that we'll be spawning a
955 // large number of threads in parallel. The backend of rustc contains
956 // global rate limiting through the `jobserver` crate so we'll never
957 // overload the system with too much work, but rather we'll only be
958 // optimizing when we're otherwise cooperating with other instances of
961 // Rather a high number here means that we should be able to keep a lot
962 // of idle cpus busy. By ensuring that no codegen unit takes *too* long
963 // to build we'll be guaranteed that all cpus will finish pretty closely
964 // to one another and we should make relatively optimal use of system
967 // Note that the main cost of codegen units is that it prevents LLVM
968 // from inlining across codegen units. Users in general don't have a lot
969 // of control over how codegen units are split up so it's our job in the
970 // compiler to ensure that undue performance isn't lost when using
971 // codegen units (aka we can't require everyone to slap `#[inline]` on
974 // If we're compiling at `-O0` then the number doesn't really matter too
975 // much because performance doesn't matter and inlining is ok to lose.
976 // In debug mode we just want to try to guarantee that no cpu is stuck
977 // doing work that could otherwise be farmed to others.
979 // In release mode, however (O1 and above) performance does indeed
980 // matter! To recover the loss in performance due to inlining we'll be
981 // enabling ThinLTO by default (the function for which is just below).
982 // This will ensure that we recover any inlining wins we otherwise lost
983 // through codegen unit partitioning.
987 // Ok that's a lot of words but the basic tl;dr; is that we want a high
988 // number here -- but not too high. Additionally we're "safe" to have it
989 // always at the same number at all optimization levels.
991 // As a result 16 was chosen here! Mostly because it was a power of 2
992 // and most benchmarks agreed it was roughly a local optimum. Not very
997 pub fn teach(&self, code: &DiagnosticId) -> bool {
998 self.opts.debugging_opts.teach && self.diagnostic().must_teach(code)
1001 pub fn rust_2015(&self) -> bool {
1002 self.opts.edition == Edition::Edition2015
1005 /// Are we allowed to use features from the Rust 2018 edition?
1006 pub fn rust_2018(&self) -> bool {
1007 self.opts.edition >= Edition::Edition2018
1010 /// Are we allowed to use features from the Rust 2021 edition?
1011 pub fn rust_2021(&self) -> bool {
1012 self.opts.edition >= Edition::Edition2021
1015 pub fn edition(&self) -> Edition {
1019 /// Returns `true` if we cannot skip the PLT for shared library calls.
1020 pub fn needs_plt(&self) -> bool {
1021 // Check if the current target usually needs PLT to be enabled.
1022 // The user can use the command line flag to override it.
1023 let needs_plt = self.target.needs_plt;
1025 let dbg_opts = &self.opts.debugging_opts;
1027 let relro_level = dbg_opts.relro_level.unwrap_or(self.target.relro_level);
1029 // Only enable this optimization by default if full relro is also enabled.
1030 // In this case, lazy binding was already unavailable, so nothing is lost.
1031 // This also ensures `-Wl,-z,now` is supported by the linker.
1032 let full_relro = RelroLevel::Full == relro_level;
1034 // If user didn't explicitly forced us to use / skip the PLT,
1035 // then try to skip it where possible.
1036 dbg_opts.plt.unwrap_or(needs_plt || !full_relro)
1039 /// Checks if LLVM lifetime markers should be emitted.
1040 pub fn emit_lifetime_markers(&self) -> bool {
1041 self.opts.optimize != config::OptLevel::No
1042 // AddressSanitizer uses lifetimes to detect use after scope bugs.
1043 // MemorySanitizer uses lifetimes to detect use of uninitialized stack variables.
1044 // HWAddressSanitizer will use lifetimes to detect use after scope bugs in the future.
1045 || self.opts.debugging_opts.sanitizer.intersects(SanitizerSet::ADDRESS | SanitizerSet::MEMORY | SanitizerSet::HWADDRESS)
1048 pub fn link_dead_code(&self) -> bool {
1049 self.opts.cg.link_dead_code.unwrap_or(false)
1052 pub fn instrument_coverage(&self) -> bool {
1053 self.opts.instrument_coverage()
1056 pub fn instrument_coverage_except_unused_generics(&self) -> bool {
1057 self.opts.instrument_coverage_except_unused_generics()
1060 pub fn instrument_coverage_except_unused_functions(&self) -> bool {
1061 self.opts.instrument_coverage_except_unused_functions()
1064 pub fn is_proc_macro_attr(&self, attr: &Attribute) -> bool {
1065 [sym::proc_macro, sym::proc_macro_attribute, sym::proc_macro_derive]
1067 .any(|kind| attr.has_name(*kind))
1070 pub fn contains_name(&self, attrs: &[Attribute], name: Symbol) -> bool {
1071 attrs.iter().any(|item| item.has_name(name))
1074 pub fn find_by_name<'a>(
1076 attrs: &'a [Attribute],
1078 ) -> Option<&'a Attribute> {
1079 attrs.iter().find(|attr| attr.has_name(name))
1082 pub fn filter_by_name<'a>(
1084 attrs: &'a [Attribute],
1086 ) -> impl Iterator<Item = &'a Attribute> {
1087 attrs.iter().filter(move |attr| attr.has_name(name))
1090 pub fn first_attr_value_str_by_name(
1092 attrs: &[Attribute],
1094 ) -> Option<Symbol> {
1095 attrs.iter().find(|at| at.has_name(name)).and_then(|at| at.value_str())
1100 sopts: &config::Options,
1101 registry: rustc_errors::registry::Registry,
1102 source_map: Lrc<SourceMap>,
1103 emitter_dest: Option<Box<dyn Write + Send>>,
1104 ) -> Box<dyn Emitter + sync::Send> {
1105 let macro_backtrace = sopts.debugging_opts.macro_backtrace;
1106 match (sopts.error_format, emitter_dest) {
1107 (config::ErrorOutputType::HumanReadable(kind), dst) => {
1108 let (short, color_config) = kind.unzip();
1110 if let HumanReadableErrorType::AnnotateSnippet(_) = kind {
1112 AnnotateSnippetEmitterWriter::new(Some(source_map), short, macro_backtrace);
1113 Box::new(emitter.ui_testing(sopts.debugging_opts.ui_testing))
1115 let emitter = match dst {
1116 None => EmitterWriter::stderr(
1120 sopts.debugging_opts.teach,
1121 sopts.debugging_opts.terminal_width,
1124 Some(dst) => EmitterWriter::new(
1128 false, // no teach messages when writing to a buffer
1129 false, // no colors when writing to a buffer
1130 None, // no terminal width
1134 Box::new(emitter.ui_testing(sopts.debugging_opts.ui_testing))
1137 (config::ErrorOutputType::Json { pretty, json_rendered }, None) => Box::new(
1138 JsonEmitter::stderr(
1143 sopts.debugging_opts.terminal_width,
1146 .ui_testing(sopts.debugging_opts.ui_testing),
1148 (config::ErrorOutputType::Json { pretty, json_rendered }, Some(dst)) => Box::new(
1155 sopts.debugging_opts.terminal_width,
1158 .ui_testing(sopts.debugging_opts.ui_testing),
1163 pub enum DiagnosticOutput {
1165 Raw(Box<dyn Write + Send>),
1168 pub fn build_session(
1169 sopts: config::Options,
1170 local_crate_source_file: Option<PathBuf>,
1171 registry: rustc_errors::registry::Registry,
1172 diagnostics_output: DiagnosticOutput,
1173 driver_lint_caps: FxHashMap<lint::LintId, lint::Level>,
1174 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
1175 target_override: Option<Target>,
1177 // FIXME: This is not general enough to make the warning lint completely override
1178 // normal diagnostic warnings, since the warning lint can also be denied and changed
1179 // later via the source code.
1180 let warnings_allow = sopts
1183 .filter(|&&(ref key, _)| *key == "warnings")
1184 .map(|&(_, ref level)| *level == lint::Allow)
1187 let cap_lints_allow = sopts.lint_cap.map_or(false, |cap| cap == lint::Allow);
1188 let can_emit_warnings = !(warnings_allow || cap_lints_allow);
1190 let write_dest = match diagnostics_output {
1191 DiagnosticOutput::Default => None,
1192 DiagnosticOutput::Raw(write) => Some(write),
1195 let sysroot = match &sopts.maybe_sysroot {
1196 Some(sysroot) => sysroot.clone(),
1197 None => filesearch::get_or_default_sysroot(),
1200 let target_cfg = config::build_target_config(&sopts, target_override, &sysroot);
1201 let host_triple = TargetTriple::from_triple(config::host_triple());
1202 let (host, target_warnings) = Target::search(&host_triple, &sysroot).unwrap_or_else(|e| {
1203 early_error(sopts.error_format, &format!("Error loading host specification: {}", e))
1205 for warning in target_warnings.warning_messages() {
1206 early_warn(sopts.error_format, &warning)
1209 let loader = file_loader.unwrap_or_else(|| Box::new(RealFileLoader));
1210 let hash_kind = sopts.debugging_opts.src_hash_algorithm.unwrap_or_else(|| {
1211 if target_cfg.is_like_msvc {
1212 SourceFileHashAlgorithm::Sha1
1214 SourceFileHashAlgorithm::Md5
1217 let source_map = Lrc::new(SourceMap::with_file_loader_and_hash_kind(
1219 sopts.file_path_mapping(),
1222 let emitter = default_emitter(&sopts, registry, source_map.clone(), write_dest);
1224 let span_diagnostic = rustc_errors::Handler::with_emitter_and_flags(
1226 sopts.debugging_opts.diagnostic_handler_flags(can_emit_warnings),
1229 let self_profiler = if let SwitchWithOptPath::Enabled(ref d) = sopts.debugging_opts.self_profile
1232 if let Some(ref directory) = d { directory } else { std::path::Path::new(".") };
1234 let profiler = SelfProfiler::new(
1236 sopts.crate_name.as_deref(),
1237 &sopts.debugging_opts.self_profile_events,
1240 Ok(profiler) => Some(Arc::new(profiler)),
1242 early_warn(sopts.error_format, &format!("failed to create profiler: {}", e));
1250 let mut parse_sess = ParseSess::with_span_handler(span_diagnostic, source_map);
1251 parse_sess.assume_incomplete_release = sopts.debugging_opts.assume_incomplete_release;
1253 let host_triple = config::host_triple();
1254 let target_triple = sopts.target_triple.triple();
1255 let host_tlib_path = Lrc::new(SearchPath::from_sysroot_and_triple(&sysroot, host_triple));
1256 let target_tlib_path = if host_triple == target_triple {
1257 // Use the same `SearchPath` if host and target triple are identical to avoid unnecessary
1258 // rescanning of the target lib path and an unnecessary allocation.
1259 host_tlib_path.clone()
1261 Lrc::new(SearchPath::from_sysroot_and_triple(&sysroot, target_triple))
1264 let file_path_mapping = sopts.file_path_mapping();
1266 let local_crate_source_file =
1267 local_crate_source_file.map(|path| file_path_mapping.map_prefix(path).0);
1269 let optimization_fuel = Lock::new(OptimizationFuel {
1270 remaining: sopts.debugging_opts.fuel.as_ref().map_or(0, |i| i.1),
1273 let print_fuel = AtomicU64::new(0);
1275 let cgu_reuse_tracker = if sopts.debugging_opts.query_dep_graph {
1276 CguReuseTracker::new()
1278 CguReuseTracker::new_disabled()
1281 let prof = SelfProfilerRef::new(
1283 sopts.debugging_opts.time_passes || sopts.debugging_opts.time,
1284 sopts.debugging_opts.time_passes,
1287 let ctfe_backtrace = Lock::new(match env::var("RUSTC_CTFE_BACKTRACE") {
1288 Ok(ref val) if val == "immediate" => CtfeBacktrace::Immediate,
1289 Ok(ref val) if val != "0" => CtfeBacktrace::Capture,
1290 _ => CtfeBacktrace::Disabled,
1294 if target_cfg.allow_asm { InlineAsmArch::from_str(&target_cfg.arch).ok() } else { None };
1296 let sess = Session {
1304 local_crate_source_file,
1305 one_time_diagnostics: Default::default(),
1306 crate_types: OnceCell::new(),
1307 stable_crate_id: OnceCell::new(),
1308 features: OnceCell::new(),
1309 incr_comp_session: OneThread::new(RefCell::new(IncrCompSession::NotInitialized)),
1312 perf_stats: PerfStats {
1313 symbol_hash_time: Lock::new(Duration::from_secs(0)),
1314 queries_canonicalized: AtomicUsize::new(0),
1315 normalize_generic_arg_after_erasing_regions: AtomicUsize::new(0),
1316 normalize_projection_ty: AtomicUsize::new(0),
1318 code_stats: Default::default(),
1321 jobserver: jobserver::client(),
1324 miri_unleashed_features: Lock::new(Default::default()),
1326 target_features: FxHashSet::default(),
1329 validate_commandline_args_with_session_available(&sess);
1334 // If it is useful to have a Session available already for validating a
1335 // commandline argument, you can do so here.
1336 fn validate_commandline_args_with_session_available(sess: &Session) {
1337 // Since we don't know if code in an rlib will be linked to statically or
1338 // dynamically downstream, rustc generates `__imp_` symbols that help linkers
1339 // on Windows deal with this lack of knowledge (#27438). Unfortunately,
1340 // these manually generated symbols confuse LLD when it tries to merge
1341 // bitcode during ThinLTO. Therefore we disallow dynamic linking on Windows
1342 // when compiling for LLD ThinLTO. This way we can validly just not generate
1343 // the `dllimport` attributes and `__imp_` symbols in that case.
1344 if sess.opts.cg.linker_plugin_lto.enabled()
1345 && sess.opts.cg.prefer_dynamic
1346 && sess.target.is_like_windows
1349 "Linker plugin based LTO is not supported together with \
1350 `-C prefer-dynamic` when targeting Windows-like targets",
1354 // Make sure that any given profiling data actually exists so LLVM can't
1355 // decide to silently skip PGO.
1356 if let Some(ref path) = sess.opts.cg.profile_use {
1359 "File `{}` passed to `-C profile-use` does not exist.",
1365 // Do the same for sample profile data.
1366 if let Some(ref path) = sess.opts.debugging_opts.profile_sample_use {
1369 "File `{}` passed to `-C profile-sample-use` does not exist.",
1375 // Unwind tables cannot be disabled if the target requires them.
1376 if let Some(include_uwtables) = sess.opts.cg.force_unwind_tables {
1377 if sess.target.requires_uwtable && !include_uwtables {
1379 "target requires unwind tables, they cannot be disabled with \
1380 `-C force-unwind-tables=no`.",
1385 // Sanitizers can only be used on platforms that we know have working sanitizer codegen.
1386 let supported_sanitizers = sess.target.options.supported_sanitizers;
1387 let unsupported_sanitizers = sess.opts.debugging_opts.sanitizer - supported_sanitizers;
1388 match unsupported_sanitizers.into_iter().count() {
1391 .err(&format!("{} sanitizer is not supported for this target", unsupported_sanitizers)),
1392 _ => sess.err(&format!(
1393 "{} sanitizers are not supported for this target",
1394 unsupported_sanitizers
1397 // Cannot mix and match sanitizers.
1398 let mut sanitizer_iter = sess.opts.debugging_opts.sanitizer.into_iter();
1399 if let (Some(first), Some(second)) = (sanitizer_iter.next(), sanitizer_iter.next()) {
1400 sess.err(&format!("`-Zsanitizer={}` is incompatible with `-Zsanitizer={}`", first, second));
1403 // Cannot enable crt-static with sanitizers on Linux
1404 if sess.crt_static(None) && !sess.opts.debugging_opts.sanitizer.is_empty() {
1406 "sanitizer is incompatible with statically linked libc, \
1407 disable it using `-C target-feature=-crt-static`",
1411 // LLVM CFI requires LTO.
1412 if sess.is_sanitizer_cfi_enabled() {
1413 if sess.opts.cg.lto == config::LtoCli::Unspecified
1414 || sess.opts.cg.lto == config::LtoCli::No
1415 || sess.opts.cg.lto == config::LtoCli::Thin
1417 sess.err("`-Zsanitizer=cfi` requires `-Clto`");
1421 if sess.opts.debugging_opts.stack_protector != StackProtector::None {
1422 if !sess.target.options.supports_stack_protector {
1424 "`-Z stack-protector={}` is not supported for target {} and will be ignored",
1425 sess.opts.debugging_opts.stack_protector, sess.opts.target_triple
1431 /// Holds data on the current incremental compilation session, if there is one.
1433 pub enum IncrCompSession {
1434 /// This is the state the session will be in until the incr. comp. dir is
1437 /// This is the state during which the session directory is private and can
1439 Active { session_directory: PathBuf, lock_file: flock::Lock, load_dep_graph: bool },
1440 /// This is the state after the session directory has been finalized. In this
1441 /// state, the contents of the directory must not be modified any more.
1442 Finalized { session_directory: PathBuf },
1443 /// This is an error state that is reached when some compilation error has
1444 /// occurred. It indicates that the contents of the session directory must
1445 /// not be used, since they might be invalid.
1446 InvalidBecauseOfErrors { session_directory: PathBuf },
1449 pub fn early_error_no_abort(output: config::ErrorOutputType, msg: &str) {
1450 let emitter: Box<dyn Emitter + sync::Send> = match output {
1451 config::ErrorOutputType::HumanReadable(kind) => {
1452 let (short, color_config) = kind.unzip();
1453 Box::new(EmitterWriter::stderr(color_config, None, short, false, None, false))
1455 config::ErrorOutputType::Json { pretty, json_rendered } => {
1456 Box::new(JsonEmitter::basic(pretty, json_rendered, None, false))
1459 let handler = rustc_errors::Handler::with_emitter(true, None, emitter);
1460 handler.struct_fatal(msg).emit();
1463 pub fn early_error(output: config::ErrorOutputType, msg: &str) -> ! {
1464 early_error_no_abort(output, msg);
1465 rustc_errors::FatalError.raise();
1468 pub fn early_warn(output: config::ErrorOutputType, msg: &str) {
1469 let emitter: Box<dyn Emitter + sync::Send> = match output {
1470 config::ErrorOutputType::HumanReadable(kind) => {
1471 let (short, color_config) = kind.unzip();
1472 Box::new(EmitterWriter::stderr(color_config, None, short, false, None, false))
1474 config::ErrorOutputType::Json { pretty, json_rendered } => {
1475 Box::new(JsonEmitter::basic(pretty, json_rendered, None, false))
1478 let handler = rustc_errors::Handler::with_emitter(true, None, emitter);
1479 handler.struct_warn(msg).emit();