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::{DiagnosticBuilder, DiagnosticId, ErrorReported};
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>;
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>>(&self, sp: S, msg: &str) -> DiagnosticBuilder<'_> {
307 self.diagnostic().struct_span_warn(sp, msg)
309 pub fn struct_span_force_warn<S: Into<MultiSpan>>(
313 ) -> DiagnosticBuilder<'_> {
314 self.diagnostic().struct_span_force_warn(sp, msg)
316 pub fn struct_span_warn_with_code<S: Into<MultiSpan>>(
321 ) -> DiagnosticBuilder<'_> {
322 self.diagnostic().struct_span_warn_with_code(sp, msg, code)
324 pub fn struct_warn(&self, msg: &str) -> DiagnosticBuilder<'_> {
325 self.diagnostic().struct_warn(msg)
327 pub fn struct_force_warn(&self, msg: &str) -> DiagnosticBuilder<'_> {
328 self.diagnostic().struct_force_warn(msg)
330 pub fn struct_span_allow<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> DiagnosticBuilder<'_> {
331 self.diagnostic().struct_span_allow(sp, msg)
333 pub fn struct_allow(&self, msg: &str) -> DiagnosticBuilder<'_> {
334 self.diagnostic().struct_allow(msg)
336 pub fn struct_span_err<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> DiagnosticBuilder<'_> {
337 self.diagnostic().struct_span_err(sp, msg)
339 pub fn struct_span_err_with_code<S: Into<MultiSpan>>(
344 ) -> DiagnosticBuilder<'_> {
345 self.diagnostic().struct_span_err_with_code(sp, msg, code)
347 // FIXME: This method should be removed (every error should have an associated error code).
348 pub fn struct_err(&self, msg: &str) -> DiagnosticBuilder<'_> {
349 self.diagnostic().struct_err(msg)
351 pub fn struct_err_with_code(&self, msg: &str, code: DiagnosticId) -> DiagnosticBuilder<'_> {
352 self.diagnostic().struct_err_with_code(msg, code)
354 pub fn struct_span_fatal<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> DiagnosticBuilder<'_> {
355 self.diagnostic().struct_span_fatal(sp, msg)
357 pub fn struct_span_fatal_with_code<S: Into<MultiSpan>>(
362 ) -> DiagnosticBuilder<'_> {
363 self.diagnostic().struct_span_fatal_with_code(sp, msg, code)
365 pub fn struct_fatal(&self, msg: &str) -> DiagnosticBuilder<'_> {
366 self.diagnostic().struct_fatal(msg)
369 pub fn span_fatal<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> ! {
370 self.diagnostic().span_fatal(sp, msg)
372 pub fn span_fatal_with_code<S: Into<MultiSpan>>(
378 self.diagnostic().span_fatal_with_code(sp, msg, code)
380 pub fn fatal(&self, msg: &str) -> ! {
381 self.diagnostic().fatal(msg).raise()
383 pub fn span_err_or_warn<S: Into<MultiSpan>>(&self, is_warning: bool, sp: S, msg: &str) {
385 self.span_warn(sp, msg);
387 self.span_err(sp, msg);
390 pub fn span_err<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
391 self.diagnostic().span_err(sp, msg)
393 pub fn span_err_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: DiagnosticId) {
394 self.diagnostic().span_err_with_code(sp, &msg, code)
396 pub fn err(&self, msg: &str) {
397 self.diagnostic().err(msg)
399 pub fn emit_err<'a>(&'a self, err: impl SessionDiagnostic<'a>) {
400 err.into_diagnostic(self).emit()
403 pub fn err_count(&self) -> usize {
404 self.diagnostic().err_count()
406 pub fn has_errors(&self) -> bool {
407 self.diagnostic().has_errors()
409 pub fn has_errors_or_delayed_span_bugs(&self) -> bool {
410 self.diagnostic().has_errors_or_delayed_span_bugs()
412 pub fn abort_if_errors(&self) {
413 self.diagnostic().abort_if_errors();
415 pub fn compile_status(&self) -> Result<(), ErrorReported> {
416 if self.diagnostic().has_errors_or_lint_errors() {
417 self.diagnostic().emit_stashed_diagnostics();
423 // FIXME(matthewjasper) Remove this method, it should never be needed.
424 pub fn track_errors<F, T>(&self, f: F) -> Result<T, ErrorReported>
428 let old_count = self.err_count();
430 if self.err_count() == old_count { Ok(result) } else { Err(ErrorReported) }
432 pub fn span_warn<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
433 self.diagnostic().span_warn(sp, msg)
435 pub fn span_warn_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: DiagnosticId) {
436 self.diagnostic().span_warn_with_code(sp, msg, code)
438 pub fn warn(&self, msg: &str) {
439 self.diagnostic().warn(msg)
441 /// Delay a span_bug() call until abort_if_errors()
443 pub fn delay_span_bug<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
444 self.diagnostic().delay_span_bug(sp, msg)
447 /// Used for code paths of expensive computations that should only take place when
448 /// warnings or errors are emitted. If no messages are emitted ("good path"), then
449 /// it's likely a bug.
450 pub fn delay_good_path_bug(&self, msg: &str) {
451 if self.opts.debugging_opts.print_type_sizes
452 || self.opts.debugging_opts.query_dep_graph
453 || self.opts.debugging_opts.dump_mir.is_some()
454 || self.opts.debugging_opts.unpretty.is_some()
455 || self.opts.output_types.contains_key(&OutputType::Mir)
456 || std::env::var_os("RUSTC_LOG").is_some()
461 self.diagnostic().delay_good_path_bug(msg)
464 pub fn note_without_error(&self, msg: &str) {
465 self.diagnostic().note_without_error(msg)
467 pub fn span_note_without_error<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
468 self.diagnostic().span_note_without_error(sp, msg)
470 pub fn struct_note_without_error(&self, msg: &str) -> DiagnosticBuilder<'_> {
471 self.diagnostic().struct_note_without_error(msg)
475 pub fn diagnostic(&self) -> &rustc_errors::Handler {
476 &self.parse_sess.span_diagnostic
479 pub fn with_disabled_diagnostic<T, F: FnOnce() -> T>(&self, f: F) -> T {
480 self.parse_sess.span_diagnostic.with_disabled_diagnostic(f)
483 /// Analogous to calling methods on the given `DiagnosticBuilder`, but
484 /// deduplicates on lint ID, span (if any), and message for this `Session`
485 fn diag_once<'a, 'b>(
487 diag_builder: &'b mut DiagnosticBuilder<'a>,
488 method: DiagnosticBuilderMethod,
489 msg_id: DiagnosticMessageId,
491 span_maybe: Option<Span>,
493 let id_span_message = (msg_id, span_maybe, message.to_owned());
494 let fresh = self.one_time_diagnostics.borrow_mut().insert(id_span_message);
497 DiagnosticBuilderMethod::Note => {
498 diag_builder.note(message);
500 DiagnosticBuilderMethod::SpanNote => {
501 let span = span_maybe.expect("`span_note` needs a span");
502 diag_builder.span_note(span, message);
508 pub fn diag_span_note_once<'a, 'b>(
510 diag_builder: &'b mut DiagnosticBuilder<'a>,
511 msg_id: DiagnosticMessageId,
517 DiagnosticBuilderMethod::SpanNote,
524 pub fn diag_note_once<'a, 'b>(
526 diag_builder: &'b mut DiagnosticBuilder<'a>,
527 msg_id: DiagnosticMessageId,
530 self.diag_once(diag_builder, DiagnosticBuilderMethod::Note, msg_id, message, None);
534 pub fn source_map(&self) -> &SourceMap {
535 self.parse_sess.source_map()
537 pub fn verbose(&self) -> bool {
538 self.opts.debugging_opts.verbose
540 pub fn time_passes(&self) -> bool {
541 self.opts.debugging_opts.time_passes || self.opts.debugging_opts.time
543 pub fn instrument_mcount(&self) -> bool {
544 self.opts.debugging_opts.instrument_mcount
546 pub fn time_llvm_passes(&self) -> bool {
547 self.opts.debugging_opts.time_llvm_passes
549 pub fn meta_stats(&self) -> bool {
550 self.opts.debugging_opts.meta_stats
552 pub fn asm_comments(&self) -> bool {
553 self.opts.debugging_opts.asm_comments
555 pub fn verify_llvm_ir(&self) -> bool {
556 self.opts.debugging_opts.verify_llvm_ir || option_env!("RUSTC_VERIFY_LLVM_IR").is_some()
558 pub fn print_llvm_passes(&self) -> bool {
559 self.opts.debugging_opts.print_llvm_passes
561 pub fn binary_dep_depinfo(&self) -> bool {
562 self.opts.debugging_opts.binary_dep_depinfo
564 pub fn mir_opt_level(&self) -> usize {
565 self.opts.mir_opt_level()
568 /// Gets the features enabled for the current compilation session.
569 /// DO NOT USE THIS METHOD if there is a TyCtxt available, as it circumvents
570 /// dependency tracking. Use tcx.features() instead.
572 pub fn features_untracked(&self) -> &rustc_feature::Features {
573 self.features.get().unwrap()
576 pub fn init_features(&self, features: rustc_feature::Features) {
577 match self.features.set(features) {
579 Err(_) => panic!("`features` was initialized twice"),
583 /// Calculates the flavor of LTO to use for this compilation.
584 pub fn lto(&self) -> config::Lto {
585 // If our target has codegen requirements ignore the command line
586 if self.target.requires_lto {
587 return config::Lto::Fat;
590 // If the user specified something, return that. If they only said `-C
591 // lto` and we've for whatever reason forced off ThinLTO via the CLI,
592 // then ensure we can't use a ThinLTO.
593 match self.opts.cg.lto {
594 config::LtoCli::Unspecified => {
595 // The compiler was invoked without the `-Clto` flag. Fall
596 // through to the default handling
598 config::LtoCli::No => {
599 // The user explicitly opted out of any kind of LTO
600 return config::Lto::No;
602 config::LtoCli::Yes | config::LtoCli::Fat | config::LtoCli::NoParam => {
603 // All of these mean fat LTO
604 return config::Lto::Fat;
606 config::LtoCli::Thin => {
607 return if self.opts.cli_forced_thinlto_off {
615 // Ok at this point the target doesn't require anything and the user
616 // hasn't asked for anything. Our next decision is whether or not
617 // we enable "auto" ThinLTO where we use multiple codegen units and
618 // then do ThinLTO over those codegen units. The logic below will
619 // either return `No` or `ThinLocal`.
621 // If processing command line options determined that we're incompatible
622 // with ThinLTO (e.g., `-C lto --emit llvm-ir`) then return that option.
623 if self.opts.cli_forced_thinlto_off {
624 return config::Lto::No;
627 // If `-Z thinlto` specified process that, but note that this is mostly
628 // a deprecated option now that `-C lto=thin` exists.
629 if let Some(enabled) = self.opts.debugging_opts.thinlto {
631 return config::Lto::ThinLocal;
633 return config::Lto::No;
637 // If there's only one codegen unit and LTO isn't enabled then there's
638 // no need for ThinLTO so just return false.
639 if self.codegen_units() == 1 {
640 return config::Lto::No;
643 // Now we're in "defaults" territory. By default we enable ThinLTO for
644 // optimized compiles (anything greater than O0).
645 match self.opts.optimize {
646 config::OptLevel::No => config::Lto::No,
647 _ => config::Lto::ThinLocal,
651 /// Returns the panic strategy for this compile session. If the user explicitly selected one
652 /// using '-C panic', use that, otherwise use the panic strategy defined by the target.
653 pub fn panic_strategy(&self) -> PanicStrategy {
654 self.opts.cg.panic.unwrap_or(self.target.panic_strategy)
656 pub fn fewer_names(&self) -> bool {
657 if let Some(fewer_names) = self.opts.debugging_opts.fewer_names {
660 let more_names = self.opts.output_types.contains_key(&OutputType::LlvmAssembly)
661 || self.opts.output_types.contains_key(&OutputType::Bitcode)
662 // AddressSanitizer and MemorySanitizer use alloca name when reporting an issue.
663 || self.opts.debugging_opts.sanitizer.intersects(SanitizerSet::ADDRESS | SanitizerSet::MEMORY);
668 pub fn unstable_options(&self) -> bool {
669 self.opts.debugging_opts.unstable_options
671 pub fn is_nightly_build(&self) -> bool {
672 self.opts.unstable_features.is_nightly_build()
674 pub fn is_sanitizer_cfi_enabled(&self) -> bool {
675 self.opts.debugging_opts.sanitizer.contains(SanitizerSet::CFI)
677 pub fn overflow_checks(&self) -> bool {
678 self.opts.cg.overflow_checks.unwrap_or(self.opts.debug_assertions)
681 /// Check whether this compile session and crate type use static crt.
682 pub fn crt_static(&self, crate_type: Option<CrateType>) -> bool {
683 if !self.target.crt_static_respected {
684 // If the target does not opt in to crt-static support, use its default.
685 return self.target.crt_static_default;
688 let requested_features = self.opts.cg.target_feature.split(',');
689 let found_negative = requested_features.clone().any(|r| r == "-crt-static");
690 let found_positive = requested_features.clone().any(|r| r == "+crt-static");
692 if found_positive || found_negative {
694 } else if crate_type == Some(CrateType::ProcMacro)
695 || crate_type == None && self.opts.crate_types.contains(&CrateType::ProcMacro)
697 // FIXME: When crate_type is not available,
698 // we use compiler options to determine the crate_type.
699 // We can't check `#![crate_type = "proc-macro"]` here.
702 self.target.crt_static_default
706 pub fn relocation_model(&self) -> RelocModel {
707 self.opts.cg.relocation_model.unwrap_or(self.target.relocation_model)
710 pub fn code_model(&self) -> Option<CodeModel> {
711 self.opts.cg.code_model.or(self.target.code_model)
714 pub fn tls_model(&self) -> TlsModel {
715 self.opts.debugging_opts.tls_model.unwrap_or(self.target.tls_model)
718 pub fn is_wasi_reactor(&self) -> bool {
719 self.target.options.os == "wasi"
721 self.opts.debugging_opts.wasi_exec_model,
722 Some(config::WasiExecModel::Reactor)
726 pub fn split_debuginfo(&self) -> SplitDebuginfo {
727 self.opts.cg.split_debuginfo.unwrap_or(self.target.split_debuginfo)
730 pub fn stack_protector(&self) -> StackProtector {
731 if self.target.options.supports_stack_protector {
732 self.opts.debugging_opts.stack_protector
738 pub fn target_can_use_split_dwarf(&self) -> bool {
739 !self.target.is_like_windows && !self.target.is_like_osx
742 pub fn must_emit_unwind_tables(&self) -> bool {
743 // This is used to control the emission of the `uwtable` attribute on
746 // Unwind tables are needed when compiling with `-C panic=unwind`, but
747 // LLVM won't omit unwind tables unless the function is also marked as
748 // `nounwind`, so users are allowed to disable `uwtable` emission.
749 // Historically rustc always emits `uwtable` attributes by default, so
750 // even they can be disabled, they're still emitted by default.
752 // On some targets (including windows), however, exceptions include
753 // other events such as illegal instructions, segfaults, etc. This means
754 // that on Windows we end up still needing unwind tables even if the `-C
755 // panic=abort` flag is passed.
757 // You can also find more info on why Windows needs unwind tables in:
758 // https://bugzilla.mozilla.org/show_bug.cgi?id=1302078
760 // If a target requires unwind tables, then they must be emitted.
761 // Otherwise, we can defer to the `-C force-unwind-tables=<yes/no>`
762 // value, if it is provided, or disable them, if not.
763 self.target.requires_uwtable
764 || self.opts.cg.force_unwind_tables.unwrap_or(
765 self.panic_strategy() == PanicStrategy::Unwind || self.target.default_uwtable,
769 pub fn generate_proc_macro_decls_symbol(&self, stable_crate_id: StableCrateId) -> String {
770 format!("__rustc_proc_macro_decls_{:08x}__", stable_crate_id.to_u64())
773 pub fn target_filesearch(&self, kind: PathKind) -> filesearch::FileSearch<'_> {
774 filesearch::FileSearch::new(
776 self.opts.target_triple.triple(),
777 &self.opts.search_paths,
778 &self.target_tlib_path,
782 pub fn host_filesearch(&self, kind: PathKind) -> filesearch::FileSearch<'_> {
783 filesearch::FileSearch::new(
785 config::host_triple(),
786 &self.opts.search_paths,
787 &self.host_tlib_path,
792 /// Returns a list of directories where target-specific tool binaries are located.
793 pub fn get_tools_search_paths(&self, self_contained: bool) -> Vec<PathBuf> {
794 let rustlib_path = rustc_target::target_rustlib_path(&self.sysroot, &config::host_triple());
795 let p = PathBuf::from_iter([
796 Path::new(&self.sysroot),
797 Path::new(&rustlib_path),
800 if self_contained { vec![p.clone(), p.join("self-contained")] } else { vec![p] }
803 pub fn init_incr_comp_session(
805 session_dir: PathBuf,
806 lock_file: flock::Lock,
807 load_dep_graph: bool,
809 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
811 if let IncrCompSession::NotInitialized = *incr_comp_session {
813 panic!("Trying to initialize IncrCompSession `{:?}`", *incr_comp_session)
817 IncrCompSession::Active { session_directory: session_dir, lock_file, load_dep_graph };
820 pub fn finalize_incr_comp_session(&self, new_directory_path: PathBuf) {
821 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
823 if let IncrCompSession::Active { .. } = *incr_comp_session {
825 panic!("trying to finalize `IncrCompSession` `{:?}`", *incr_comp_session);
828 // Note: this will also drop the lock file, thus unlocking the directory.
829 *incr_comp_session = IncrCompSession::Finalized { session_directory: new_directory_path };
832 pub fn mark_incr_comp_session_as_invalid(&self) {
833 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
835 let session_directory = match *incr_comp_session {
836 IncrCompSession::Active { ref session_directory, .. } => session_directory.clone(),
837 IncrCompSession::InvalidBecauseOfErrors { .. } => return,
838 _ => panic!("trying to invalidate `IncrCompSession` `{:?}`", *incr_comp_session),
841 // Note: this will also drop the lock file, thus unlocking the directory.
842 *incr_comp_session = IncrCompSession::InvalidBecauseOfErrors { session_directory };
845 pub fn incr_comp_session_dir(&self) -> cell::Ref<'_, PathBuf> {
846 let incr_comp_session = self.incr_comp_session.borrow();
847 cell::Ref::map(incr_comp_session, |incr_comp_session| match *incr_comp_session {
848 IncrCompSession::NotInitialized => panic!(
849 "trying to get session directory from `IncrCompSession`: {:?}",
852 IncrCompSession::Active { ref session_directory, .. }
853 | IncrCompSession::Finalized { ref session_directory }
854 | IncrCompSession::InvalidBecauseOfErrors { ref session_directory } => {
860 pub fn incr_comp_session_dir_opt(&self) -> Option<cell::Ref<'_, PathBuf>> {
861 self.opts.incremental.as_ref().map(|_| self.incr_comp_session_dir())
864 pub fn print_perf_stats(&self) {
866 "Total time spent computing symbol hashes: {}",
867 duration_to_secs_str(*self.perf_stats.symbol_hash_time.lock())
870 "Total queries canonicalized: {}",
871 self.perf_stats.queries_canonicalized.load(Ordering::Relaxed)
874 "normalize_generic_arg_after_erasing_regions: {}",
875 self.perf_stats.normalize_generic_arg_after_erasing_regions.load(Ordering::Relaxed)
878 "normalize_projection_ty: {}",
879 self.perf_stats.normalize_projection_ty.load(Ordering::Relaxed)
883 /// We want to know if we're allowed to do an optimization for crate foo from -z fuel=foo=n.
884 /// This expends fuel if applicable, and records fuel if applicable.
885 pub fn consider_optimizing<T: Fn() -> String>(&self, crate_name: &str, msg: T) -> bool {
887 if let Some((ref c, _)) = self.opts.debugging_opts.fuel {
889 assert_eq!(self.threads(), 1);
890 let mut fuel = self.optimization_fuel.lock();
891 ret = fuel.remaining != 0;
892 if fuel.remaining == 0 && !fuel.out_of_fuel {
893 if self.diagnostic().can_emit_warnings() {
894 // We only call `msg` in case we can actually emit warnings.
895 // Otherwise, this could cause a `delay_good_path_bug` to
896 // trigger (issue #79546).
897 self.warn(&format!("optimization-fuel-exhausted: {}", msg()));
899 fuel.out_of_fuel = true;
900 } else if fuel.remaining > 0 {
905 if let Some(ref c) = self.opts.debugging_opts.print_fuel {
907 assert_eq!(self.threads(), 1);
908 self.print_fuel.fetch_add(1, SeqCst);
914 /// Returns the number of query threads that should be used for this
916 pub fn threads(&self) -> usize {
917 self.opts.debugging_opts.threads
920 /// Returns the number of codegen units that should be used for this
922 pub fn codegen_units(&self) -> usize {
923 if let Some(n) = self.opts.cli_forced_codegen_units {
926 if let Some(n) = self.target.default_codegen_units {
930 // If incremental compilation is turned on, we default to a high number
931 // codegen units in order to reduce the "collateral damage" small
933 if self.opts.incremental.is_some() {
937 // Why is 16 codegen units the default all the time?
939 // The main reason for enabling multiple codegen units by default is to
940 // leverage the ability for the codegen backend to do codegen and
941 // optimization in parallel. This allows us, especially for large crates, to
942 // make good use of all available resources on the machine once we've
943 // hit that stage of compilation. Large crates especially then often
944 // take a long time in codegen/optimization and this helps us amortize that
947 // Note that a high number here doesn't mean that we'll be spawning a
948 // large number of threads in parallel. The backend of rustc contains
949 // global rate limiting through the `jobserver` crate so we'll never
950 // overload the system with too much work, but rather we'll only be
951 // optimizing when we're otherwise cooperating with other instances of
954 // Rather a high number here means that we should be able to keep a lot
955 // of idle cpus busy. By ensuring that no codegen unit takes *too* long
956 // to build we'll be guaranteed that all cpus will finish pretty closely
957 // to one another and we should make relatively optimal use of system
960 // Note that the main cost of codegen units is that it prevents LLVM
961 // from inlining across codegen units. Users in general don't have a lot
962 // of control over how codegen units are split up so it's our job in the
963 // compiler to ensure that undue performance isn't lost when using
964 // codegen units (aka we can't require everyone to slap `#[inline]` on
967 // If we're compiling at `-O0` then the number doesn't really matter too
968 // much because performance doesn't matter and inlining is ok to lose.
969 // In debug mode we just want to try to guarantee that no cpu is stuck
970 // doing work that could otherwise be farmed to others.
972 // In release mode, however (O1 and above) performance does indeed
973 // matter! To recover the loss in performance due to inlining we'll be
974 // enabling ThinLTO by default (the function for which is just below).
975 // This will ensure that we recover any inlining wins we otherwise lost
976 // through codegen unit partitioning.
980 // Ok that's a lot of words but the basic tl;dr; is that we want a high
981 // number here -- but not too high. Additionally we're "safe" to have it
982 // always at the same number at all optimization levels.
984 // As a result 16 was chosen here! Mostly because it was a power of 2
985 // and most benchmarks agreed it was roughly a local optimum. Not very
990 pub fn teach(&self, code: &DiagnosticId) -> bool {
991 self.opts.debugging_opts.teach && self.diagnostic().must_teach(code)
994 pub fn rust_2015(&self) -> bool {
995 self.opts.edition == Edition::Edition2015
998 /// Are we allowed to use features from the Rust 2018 edition?
999 pub fn rust_2018(&self) -> bool {
1000 self.opts.edition >= Edition::Edition2018
1003 /// Are we allowed to use features from the Rust 2021 edition?
1004 pub fn rust_2021(&self) -> bool {
1005 self.opts.edition >= Edition::Edition2021
1008 pub fn edition(&self) -> Edition {
1012 /// Returns `true` if we cannot skip the PLT for shared library calls.
1013 pub fn needs_plt(&self) -> bool {
1014 // Check if the current target usually needs PLT to be enabled.
1015 // The user can use the command line flag to override it.
1016 let needs_plt = self.target.needs_plt;
1018 let dbg_opts = &self.opts.debugging_opts;
1020 let relro_level = dbg_opts.relro_level.unwrap_or(self.target.relro_level);
1022 // Only enable this optimization by default if full relro is also enabled.
1023 // In this case, lazy binding was already unavailable, so nothing is lost.
1024 // This also ensures `-Wl,-z,now` is supported by the linker.
1025 let full_relro = RelroLevel::Full == relro_level;
1027 // If user didn't explicitly forced us to use / skip the PLT,
1028 // then try to skip it where possible.
1029 dbg_opts.plt.unwrap_or(needs_plt || !full_relro)
1032 /// Checks if LLVM lifetime markers should be emitted.
1033 pub fn emit_lifetime_markers(&self) -> bool {
1034 self.opts.optimize != config::OptLevel::No
1035 // AddressSanitizer uses lifetimes to detect use after scope bugs.
1036 // MemorySanitizer uses lifetimes to detect use of uninitialized stack variables.
1037 // HWAddressSanitizer will use lifetimes to detect use after scope bugs in the future.
1038 || self.opts.debugging_opts.sanitizer.intersects(SanitizerSet::ADDRESS | SanitizerSet::MEMORY | SanitizerSet::HWADDRESS)
1041 pub fn link_dead_code(&self) -> bool {
1042 self.opts.cg.link_dead_code.unwrap_or(false)
1045 pub fn instrument_coverage(&self) -> bool {
1046 self.opts.instrument_coverage()
1049 pub fn instrument_coverage_except_unused_generics(&self) -> bool {
1050 self.opts.instrument_coverage_except_unused_generics()
1053 pub fn instrument_coverage_except_unused_functions(&self) -> bool {
1054 self.opts.instrument_coverage_except_unused_functions()
1057 pub fn is_proc_macro_attr(&self, attr: &Attribute) -> bool {
1058 [sym::proc_macro, sym::proc_macro_attribute, sym::proc_macro_derive]
1060 .any(|kind| attr.has_name(*kind))
1063 pub fn contains_name(&self, attrs: &[Attribute], name: Symbol) -> bool {
1064 attrs.iter().any(|item| item.has_name(name))
1067 pub fn find_by_name<'a>(
1069 attrs: &'a [Attribute],
1071 ) -> Option<&'a Attribute> {
1072 attrs.iter().find(|attr| attr.has_name(name))
1075 pub fn filter_by_name<'a>(
1077 attrs: &'a [Attribute],
1079 ) -> impl Iterator<Item = &'a Attribute> {
1080 attrs.iter().filter(move |attr| attr.has_name(name))
1083 pub fn first_attr_value_str_by_name(
1085 attrs: &[Attribute],
1087 ) -> Option<Symbol> {
1088 attrs.iter().find(|at| at.has_name(name)).and_then(|at| at.value_str())
1093 sopts: &config::Options,
1094 registry: rustc_errors::registry::Registry,
1095 source_map: Lrc<SourceMap>,
1096 emitter_dest: Option<Box<dyn Write + Send>>,
1097 ) -> Box<dyn Emitter + sync::Send> {
1098 let macro_backtrace = sopts.debugging_opts.macro_backtrace;
1099 match (sopts.error_format, emitter_dest) {
1100 (config::ErrorOutputType::HumanReadable(kind), dst) => {
1101 let (short, color_config) = kind.unzip();
1103 if let HumanReadableErrorType::AnnotateSnippet(_) = kind {
1105 AnnotateSnippetEmitterWriter::new(Some(source_map), short, macro_backtrace);
1106 Box::new(emitter.ui_testing(sopts.debugging_opts.ui_testing))
1108 let emitter = match dst {
1109 None => EmitterWriter::stderr(
1113 sopts.debugging_opts.teach,
1114 sopts.debugging_opts.terminal_width,
1117 Some(dst) => EmitterWriter::new(
1121 false, // no teach messages when writing to a buffer
1122 false, // no colors when writing to a buffer
1123 None, // no terminal width
1127 Box::new(emitter.ui_testing(sopts.debugging_opts.ui_testing))
1130 (config::ErrorOutputType::Json { pretty, json_rendered }, None) => Box::new(
1131 JsonEmitter::stderr(
1136 sopts.debugging_opts.terminal_width,
1139 .ui_testing(sopts.debugging_opts.ui_testing),
1141 (config::ErrorOutputType::Json { pretty, json_rendered }, Some(dst)) => Box::new(
1148 sopts.debugging_opts.terminal_width,
1151 .ui_testing(sopts.debugging_opts.ui_testing),
1156 pub enum DiagnosticOutput {
1158 Raw(Box<dyn Write + Send>),
1161 pub fn build_session(
1162 sopts: config::Options,
1163 local_crate_source_file: Option<PathBuf>,
1164 registry: rustc_errors::registry::Registry,
1165 diagnostics_output: DiagnosticOutput,
1166 driver_lint_caps: FxHashMap<lint::LintId, lint::Level>,
1167 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
1168 target_override: Option<Target>,
1170 // FIXME: This is not general enough to make the warning lint completely override
1171 // normal diagnostic warnings, since the warning lint can also be denied and changed
1172 // later via the source code.
1173 let warnings_allow = sopts
1176 .filter(|&&(ref key, _)| *key == "warnings")
1177 .map(|&(_, ref level)| *level == lint::Allow)
1180 let cap_lints_allow = sopts.lint_cap.map_or(false, |cap| cap == lint::Allow);
1181 let can_emit_warnings = !(warnings_allow || cap_lints_allow);
1183 let write_dest = match diagnostics_output {
1184 DiagnosticOutput::Default => None,
1185 DiagnosticOutput::Raw(write) => Some(write),
1188 let sysroot = match &sopts.maybe_sysroot {
1189 Some(sysroot) => sysroot.clone(),
1190 None => filesearch::get_or_default_sysroot(),
1193 let target_cfg = config::build_target_config(&sopts, target_override, &sysroot);
1194 let host_triple = TargetTriple::from_triple(config::host_triple());
1195 let (host, target_warnings) = Target::search(&host_triple, &sysroot).unwrap_or_else(|e| {
1196 early_error(sopts.error_format, &format!("Error loading host specification: {}", e))
1198 for warning in target_warnings.warning_messages() {
1199 early_warn(sopts.error_format, &warning)
1202 let loader = file_loader.unwrap_or_else(|| Box::new(RealFileLoader));
1203 let hash_kind = sopts.debugging_opts.src_hash_algorithm.unwrap_or_else(|| {
1204 if target_cfg.is_like_msvc {
1205 SourceFileHashAlgorithm::Sha1
1207 SourceFileHashAlgorithm::Md5
1210 let source_map = Lrc::new(SourceMap::with_file_loader_and_hash_kind(
1212 sopts.file_path_mapping(),
1215 let emitter = default_emitter(&sopts, registry, source_map.clone(), write_dest);
1217 let span_diagnostic = rustc_errors::Handler::with_emitter_and_flags(
1219 sopts.debugging_opts.diagnostic_handler_flags(can_emit_warnings),
1222 let self_profiler = if let SwitchWithOptPath::Enabled(ref d) = sopts.debugging_opts.self_profile
1225 if let Some(ref directory) = d { directory } else { std::path::Path::new(".") };
1227 let profiler = SelfProfiler::new(
1229 sopts.crate_name.as_deref(),
1230 &sopts.debugging_opts.self_profile_events,
1233 Ok(profiler) => Some(Arc::new(profiler)),
1235 early_warn(sopts.error_format, &format!("failed to create profiler: {}", e));
1243 let mut parse_sess = ParseSess::with_span_handler(span_diagnostic, source_map);
1244 parse_sess.assume_incomplete_release = sopts.debugging_opts.assume_incomplete_release;
1246 let host_triple = config::host_triple();
1247 let target_triple = sopts.target_triple.triple();
1248 let host_tlib_path = Lrc::new(SearchPath::from_sysroot_and_triple(&sysroot, host_triple));
1249 let target_tlib_path = if host_triple == target_triple {
1250 // Use the same `SearchPath` if host and target triple are identical to avoid unnecessary
1251 // rescanning of the target lib path and an unnecessary allocation.
1252 host_tlib_path.clone()
1254 Lrc::new(SearchPath::from_sysroot_and_triple(&sysroot, target_triple))
1257 let file_path_mapping = sopts.file_path_mapping();
1259 let local_crate_source_file =
1260 local_crate_source_file.map(|path| file_path_mapping.map_prefix(path).0);
1262 let optimization_fuel = Lock::new(OptimizationFuel {
1263 remaining: sopts.debugging_opts.fuel.as_ref().map_or(0, |i| i.1),
1266 let print_fuel = AtomicU64::new(0);
1268 let cgu_reuse_tracker = if sopts.debugging_opts.query_dep_graph {
1269 CguReuseTracker::new()
1271 CguReuseTracker::new_disabled()
1274 let prof = SelfProfilerRef::new(
1276 sopts.debugging_opts.time_passes || sopts.debugging_opts.time,
1277 sopts.debugging_opts.time_passes,
1280 let ctfe_backtrace = Lock::new(match env::var("RUSTC_CTFE_BACKTRACE") {
1281 Ok(ref val) if val == "immediate" => CtfeBacktrace::Immediate,
1282 Ok(ref val) if val != "0" => CtfeBacktrace::Capture,
1283 _ => CtfeBacktrace::Disabled,
1287 if target_cfg.allow_asm { InlineAsmArch::from_str(&target_cfg.arch).ok() } else { None };
1289 let sess = Session {
1297 local_crate_source_file,
1298 one_time_diagnostics: Default::default(),
1299 crate_types: OnceCell::new(),
1300 stable_crate_id: OnceCell::new(),
1301 features: OnceCell::new(),
1302 incr_comp_session: OneThread::new(RefCell::new(IncrCompSession::NotInitialized)),
1305 perf_stats: PerfStats {
1306 symbol_hash_time: Lock::new(Duration::from_secs(0)),
1307 queries_canonicalized: AtomicUsize::new(0),
1308 normalize_generic_arg_after_erasing_regions: AtomicUsize::new(0),
1309 normalize_projection_ty: AtomicUsize::new(0),
1311 code_stats: Default::default(),
1314 jobserver: jobserver::client(),
1317 miri_unleashed_features: Lock::new(Default::default()),
1319 target_features: FxHashSet::default(),
1322 validate_commandline_args_with_session_available(&sess);
1327 // If it is useful to have a Session available already for validating a
1328 // commandline argument, you can do so here.
1329 fn validate_commandline_args_with_session_available(sess: &Session) {
1330 // Since we don't know if code in an rlib will be linked to statically or
1331 // dynamically downstream, rustc generates `__imp_` symbols that help linkers
1332 // on Windows deal with this lack of knowledge (#27438). Unfortunately,
1333 // these manually generated symbols confuse LLD when it tries to merge
1334 // bitcode during ThinLTO. Therefore we disallow dynamic linking on Windows
1335 // when compiling for LLD ThinLTO. This way we can validly just not generate
1336 // the `dllimport` attributes and `__imp_` symbols in that case.
1337 if sess.opts.cg.linker_plugin_lto.enabled()
1338 && sess.opts.cg.prefer_dynamic
1339 && sess.target.is_like_windows
1342 "Linker plugin based LTO is not supported together with \
1343 `-C prefer-dynamic` when targeting Windows-like targets",
1347 // Make sure that any given profiling data actually exists so LLVM can't
1348 // decide to silently skip PGO.
1349 if let Some(ref path) = sess.opts.cg.profile_use {
1352 "File `{}` passed to `-C profile-use` does not exist.",
1358 // Do the same for sample profile data.
1359 if let Some(ref path) = sess.opts.debugging_opts.profile_sample_use {
1362 "File `{}` passed to `-C profile-sample-use` does not exist.",
1368 // Unwind tables cannot be disabled if the target requires them.
1369 if let Some(include_uwtables) = sess.opts.cg.force_unwind_tables {
1370 if sess.target.requires_uwtable && !include_uwtables {
1372 "target requires unwind tables, they cannot be disabled with \
1373 `-C force-unwind-tables=no`.",
1378 // Sanitizers can only be used on platforms that we know have working sanitizer codegen.
1379 let supported_sanitizers = sess.target.options.supported_sanitizers;
1380 let unsupported_sanitizers = sess.opts.debugging_opts.sanitizer - supported_sanitizers;
1381 match unsupported_sanitizers.into_iter().count() {
1384 .err(&format!("{} sanitizer is not supported for this target", unsupported_sanitizers)),
1385 _ => sess.err(&format!(
1386 "{} sanitizers are not supported for this target",
1387 unsupported_sanitizers
1390 // Cannot mix and match sanitizers.
1391 let mut sanitizer_iter = sess.opts.debugging_opts.sanitizer.into_iter();
1392 if let (Some(first), Some(second)) = (sanitizer_iter.next(), sanitizer_iter.next()) {
1393 sess.err(&format!("`-Zsanitizer={}` is incompatible with `-Zsanitizer={}`", first, second));
1396 // Cannot enable crt-static with sanitizers on Linux
1397 if sess.crt_static(None) && !sess.opts.debugging_opts.sanitizer.is_empty() {
1399 "sanitizer is incompatible with statically linked libc, \
1400 disable it using `-C target-feature=-crt-static`",
1404 // LLVM CFI requires LTO.
1405 if sess.is_sanitizer_cfi_enabled() {
1406 if sess.opts.cg.lto == config::LtoCli::Unspecified
1407 || sess.opts.cg.lto == config::LtoCli::No
1408 || sess.opts.cg.lto == config::LtoCli::Thin
1410 sess.err("`-Zsanitizer=cfi` requires `-Clto`");
1414 if sess.opts.debugging_opts.stack_protector != StackProtector::None {
1415 if !sess.target.options.supports_stack_protector {
1417 "`-Z stack-protector={}` is not supported for target {} and will be ignored",
1418 sess.opts.debugging_opts.stack_protector, sess.opts.target_triple
1424 /// Holds data on the current incremental compilation session, if there is one.
1426 pub enum IncrCompSession {
1427 /// This is the state the session will be in until the incr. comp. dir is
1430 /// This is the state during which the session directory is private and can
1432 Active { session_directory: PathBuf, lock_file: flock::Lock, load_dep_graph: bool },
1433 /// This is the state after the session directory has been finalized. In this
1434 /// state, the contents of the directory must not be modified any more.
1435 Finalized { session_directory: PathBuf },
1436 /// This is an error state that is reached when some compilation error has
1437 /// occurred. It indicates that the contents of the session directory must
1438 /// not be used, since they might be invalid.
1439 InvalidBecauseOfErrors { session_directory: PathBuf },
1442 pub fn early_error_no_abort(output: config::ErrorOutputType, msg: &str) {
1443 let emitter: Box<dyn Emitter + sync::Send> = match output {
1444 config::ErrorOutputType::HumanReadable(kind) => {
1445 let (short, color_config) = kind.unzip();
1446 Box::new(EmitterWriter::stderr(color_config, None, short, false, None, false))
1448 config::ErrorOutputType::Json { pretty, json_rendered } => {
1449 Box::new(JsonEmitter::basic(pretty, json_rendered, None, false))
1452 let handler = rustc_errors::Handler::with_emitter(true, None, emitter);
1453 handler.struct_fatal(msg).emit();
1456 pub fn early_error(output: config::ErrorOutputType, msg: &str) -> ! {
1457 early_error_no_abort(output, msg);
1458 rustc_errors::FatalError.raise();
1461 pub fn early_warn(output: config::ErrorOutputType, msg: &str) {
1462 let emitter: Box<dyn Emitter + sync::Send> = match output {
1463 config::ErrorOutputType::HumanReadable(kind) => {
1464 let (short, color_config) = kind.unzip();
1465 Box::new(EmitterWriter::stderr(color_config, None, short, false, None, false))
1467 config::ErrorOutputType::Json { pretty, json_rendered } => {
1468 Box::new(JsonEmitter::basic(pretty, json_rendered, None, false))
1471 let handler = rustc_errors::Handler::with_emitter(true, None, emitter);
1472 handler.struct_warn(msg).emit();