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};
6 use crate::lint::{self, LintId};
7 use crate::parse::ParseSess;
8 use crate::search_paths::{PathKind, SearchPath};
10 pub use rustc_ast::attr::MarkedAttrs;
11 pub use rustc_ast::Attribute;
12 use rustc_data_structures::flock;
13 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
14 use rustc_data_structures::jobserver::{self, Client};
15 use rustc_data_structures::profiling::{duration_to_secs_str, SelfProfiler, SelfProfilerRef};
16 use rustc_data_structures::sync::{
17 self, AtomicU64, AtomicUsize, Lock, Lrc, OnceCell, OneThread, Ordering, Ordering::SeqCst,
19 use rustc_errors::annotate_snippet_emitter_writer::AnnotateSnippetEmitterWriter;
20 use rustc_errors::emitter::{Emitter, EmitterWriter, HumanReadableErrorType};
21 use rustc_errors::json::JsonEmitter;
22 use rustc_errors::registry::Registry;
23 use rustc_errors::{DiagnosticBuilder, DiagnosticId, ErrorReported};
24 use rustc_macros::HashStable_Generic;
25 pub use rustc_span::def_id::StableCrateId;
26 use rustc_span::edition::Edition;
27 use rustc_span::source_map::{FileLoader, MultiSpan, RealFileLoader, SourceMap, Span};
28 use rustc_span::{sym, SourceFileHashAlgorithm, Symbol};
29 use rustc_target::asm::InlineAsmArch;
30 use rustc_target::spec::{CodeModel, PanicStrategy, RelocModel, RelroLevel};
31 use rustc_target::spec::{SanitizerSet, SplitDebuginfo, Target, TargetTriple, TlsModel};
33 use std::cell::{self, RefCell};
37 use std::num::NonZeroU32;
38 use std::ops::{Div, Mul};
39 use std::path::{Path, PathBuf};
40 use std::str::FromStr;
42 use std::time::Duration;
44 pub trait SessionLintStore: sync::Send + sync::Sync {
45 fn name_to_lint(&self, lint_name: &str) -> LintId;
48 pub struct OptimizationFuel {
49 /// If `-zfuel=crate=n` is specified, initially set to `n`, otherwise `0`.
51 /// We're rejecting all further optimizations.
55 /// The behavior of the CTFE engine when an error occurs with regards to backtraces.
56 #[derive(Clone, Copy)]
57 pub enum CtfeBacktrace {
58 /// Do nothing special, return the error as usual without a backtrace.
60 /// Capture a backtrace at the point the error is created and return it in the error
61 /// (to be printed later if/when the error ever actually gets shown to the user).
63 /// Capture a backtrace at the point the error is created and immediately print it out.
67 /// New-type wrapper around `usize` for representing limits. Ensures that comparisons against
68 /// limits are consistent throughout the compiler.
69 #[derive(Clone, Copy, Debug, HashStable_Generic)]
70 pub struct Limit(pub usize);
73 /// Create a new limit from a `usize`.
74 pub fn new(value: usize) -> Self {
78 /// Check that `value` is within the limit. Ensures that the same comparisons are used
79 /// throughout the compiler, as mismatches can cause ICEs, see #72540.
81 pub fn value_within_limit(&self, value: usize) -> bool {
86 impl From<usize> for Limit {
87 fn from(value: usize) -> Self {
92 impl fmt::Display for Limit {
93 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
94 write!(f, "{}", self.0)
98 impl Div<usize> for Limit {
101 fn div(self, rhs: usize) -> Self::Output {
102 Limit::new(self.0 / rhs)
106 impl Mul<usize> for Limit {
109 fn mul(self, rhs: usize) -> Self::Output {
110 Limit::new(self.0 * rhs)
114 #[derive(Clone, Copy, Debug, HashStable_Generic)]
116 /// The maximum recursion limit for potentially infinitely recursive
117 /// operations such as auto-dereference and monomorphization.
118 pub recursion_limit: Limit,
119 /// The size at which the `large_assignments` lint starts
121 pub move_size_limit: Limit,
122 /// The maximum length of types during monomorphization.
123 pub type_length_limit: Limit,
124 /// The maximum blocks a const expression can evaluate.
125 pub const_eval_limit: Limit,
128 /// Represents the data associated with a compilation
129 /// session for a single crate.
133 pub opts: config::Options,
134 pub host_tlib_path: Lrc<SearchPath>,
135 pub target_tlib_path: Lrc<SearchPath>,
136 pub parse_sess: ParseSess,
137 pub sysroot: PathBuf,
138 /// The name of the root source file of the crate, in the local file system.
139 /// `None` means that there is no source file.
140 pub local_crate_source_file: Option<PathBuf>,
142 /// Set of `(DiagnosticId, Option<Span>, message)` tuples tracking
143 /// (sub)diagnostics that have been set once, but should not be set again,
144 /// in order to avoid redundantly verbose output (Issue #24690, #44953).
145 pub one_time_diagnostics: Lock<FxHashSet<(DiagnosticMessageId, Option<Span>, String)>>,
146 crate_types: OnceCell<Vec<CrateType>>,
147 /// The `stable_crate_id` is constructed out of the crate name and all the
148 /// `-C metadata` arguments passed to the compiler. Its value forms a unique
149 /// global identifier for the crate. It is used to allow multiple crates
150 /// with the same name to coexist. See the
151 /// `rustc_codegen_llvm::back::symbol_names` module for more information.
152 pub stable_crate_id: OnceCell<StableCrateId>,
154 features: OnceCell<rustc_feature::Features>,
156 lint_store: OnceCell<Lrc<dyn SessionLintStore>>,
158 incr_comp_session: OneThread<RefCell<IncrCompSession>>,
159 /// Used for incremental compilation tests. Will only be populated if
160 /// `-Zquery-dep-graph` is specified.
161 pub cgu_reuse_tracker: CguReuseTracker,
163 /// Used by `-Z self-profile`.
164 pub prof: SelfProfilerRef,
166 /// Some measurements that are being gathered during compilation.
167 pub perf_stats: PerfStats,
169 /// Data about code being compiled, gathered during compilation.
170 pub code_stats: CodeStats,
172 /// If `-zfuel=crate=n` is specified, `Some(crate)`.
173 optimization_fuel_crate: Option<String>,
175 /// Tracks fuel info if `-zfuel=crate=n` is specified.
176 optimization_fuel: Lock<OptimizationFuel>,
178 /// Always set to zero and incremented so that we can print fuel expended by a crate.
179 pub print_fuel: AtomicU64,
181 /// Loaded up early on in the initialization of this `Session` to avoid
182 /// false positives about a job server in our environment.
183 pub jobserver: Client,
185 /// Cap lint level specified by a driver specifically.
186 pub driver_lint_caps: FxHashMap<lint::LintId, lint::Level>,
188 /// Tracks the current behavior of the CTFE engine when an error occurs.
189 /// Options range from returning the error without a backtrace to returning an error
190 /// and immediately printing the backtrace to stderr.
191 /// The `Lock` is only used by miri to allow setting `ctfe_backtrace` after analysis when
192 /// `MIRI_BACKTRACE` is set. This makes it only apply to miri's errors and not to all CTFE
194 pub ctfe_backtrace: Lock<CtfeBacktrace>,
196 /// This tracks where `-Zunleash-the-miri-inside-of-you` was used to get around a
197 /// const check, optionally with the relevant feature gate. We use this to
198 /// warn about unleashing, but with a single diagnostic instead of dozens that
199 /// drown everything else in noise.
200 miri_unleashed_features: Lock<Vec<(Span, Option<Symbol>)>>,
202 /// Architecture to use for interpreting asm!.
203 pub asm_arch: Option<InlineAsmArch>,
205 /// Set of enabled features for the current target.
206 pub target_features: FxHashSet<Symbol>,
209 pub struct PerfStats {
210 /// The accumulated time spent on computing symbol hashes.
211 pub symbol_hash_time: Lock<Duration>,
212 /// Total number of values canonicalized queries constructed.
213 pub queries_canonicalized: AtomicUsize,
214 /// Number of times this query is invoked.
215 pub normalize_generic_arg_after_erasing_regions: AtomicUsize,
216 /// Number of times this query is invoked.
217 pub normalize_projection_ty: AtomicUsize,
220 /// Enum to support dispatch of one-time diagnostics (in `Session.diag_once`).
221 enum DiagnosticBuilderMethod {
224 // Add more variants as needed to support one-time diagnostics.
227 /// Trait implemented by error types. This should not be implemented manually. Instead, use
228 /// `#[derive(SessionDiagnostic)]` -- see [rustc_macros::SessionDiagnostic].
229 pub trait SessionDiagnostic<'a> {
230 /// Write out as a diagnostic out of `sess`.
232 fn into_diagnostic(self, sess: &'a Session) -> DiagnosticBuilder<'a>;
235 /// Diagnostic message ID, used by `Session.one_time_diagnostics` to avoid
236 /// emitting the same message more than once.
237 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
238 pub enum DiagnosticMessageId {
239 ErrorId(u16), // EXXXX error code as integer
240 LintId(lint::LintId),
241 StabilityId(Option<NonZeroU32>), // issue number
244 impl From<&'static lint::Lint> for DiagnosticMessageId {
245 fn from(lint: &'static lint::Lint) -> Self {
246 DiagnosticMessageId::LintId(lint::LintId::of(lint))
251 pub fn miri_unleashed_feature(&self, span: Span, feature_gate: Option<Symbol>) {
252 self.miri_unleashed_features.lock().push((span, feature_gate));
255 fn check_miri_unleashed_features(&self) {
256 let unleashed_features = self.miri_unleashed_features.lock();
257 if !unleashed_features.is_empty() {
258 let mut must_err = false;
259 // Create a diagnostic pointing at where things got unleashed.
260 let mut diag = self.struct_warn("skipping const checks");
261 for &(span, feature_gate) in unleashed_features.iter() {
262 // FIXME: `span_label` doesn't do anything, so we use "help" as a hack.
263 if let Some(feature_gate) = feature_gate {
264 diag.span_help(span, &format!("skipping check for `{}` feature", feature_gate));
265 // The unleash flag must *not* be used to just "hack around" feature gates.
268 diag.span_help(span, "skipping check that does not even have a feature gate");
272 // If we should err, make sure we did.
273 if must_err && !self.has_errors() {
274 // We have skipped a feature gate, and not run into other errors... reject.
276 "`-Zunleash-the-miri-inside-of-you` may not be used to circumvent feature \
277 gates, except when testing error paths in the CTFE engine",
283 /// Invoked all the way at the end to finish off diagnostics printing.
284 pub fn finish_diagnostics(&self, registry: &Registry) {
285 self.check_miri_unleashed_features();
286 self.diagnostic().print_error_count(registry);
287 self.emit_future_breakage();
290 fn emit_future_breakage(&self) {
291 if !self.opts.debugging_opts.emit_future_incompat_report {
295 let diags = self.diagnostic().take_future_breakage_diagnostics();
296 if diags.is_empty() {
299 self.parse_sess.span_diagnostic.emit_future_breakage_report(diags);
302 pub fn local_stable_crate_id(&self) -> StableCrateId {
303 self.stable_crate_id.get().copied().unwrap()
306 pub fn crate_types(&self) -> &[CrateType] {
307 self.crate_types.get().unwrap().as_slice()
310 pub fn init_crate_types(&self, crate_types: Vec<CrateType>) {
311 self.crate_types.set(crate_types).expect("`crate_types` was initialized twice")
314 pub fn struct_span_warn<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> DiagnosticBuilder<'_> {
315 self.diagnostic().struct_span_warn(sp, msg)
317 pub fn struct_span_force_warn<S: Into<MultiSpan>>(
321 ) -> DiagnosticBuilder<'_> {
322 self.diagnostic().struct_span_force_warn(sp, msg)
324 pub fn struct_span_warn_with_code<S: Into<MultiSpan>>(
329 ) -> DiagnosticBuilder<'_> {
330 self.diagnostic().struct_span_warn_with_code(sp, msg, code)
332 pub fn struct_warn(&self, msg: &str) -> DiagnosticBuilder<'_> {
333 self.diagnostic().struct_warn(msg)
335 pub fn struct_force_warn(&self, msg: &str) -> DiagnosticBuilder<'_> {
336 self.diagnostic().struct_force_warn(msg)
338 pub fn struct_span_allow<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> DiagnosticBuilder<'_> {
339 self.diagnostic().struct_span_allow(sp, msg)
341 pub fn struct_allow(&self, msg: &str) -> DiagnosticBuilder<'_> {
342 self.diagnostic().struct_allow(msg)
344 pub fn struct_span_err<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> DiagnosticBuilder<'_> {
345 self.diagnostic().struct_span_err(sp, msg)
347 pub fn struct_span_err_with_code<S: Into<MultiSpan>>(
352 ) -> DiagnosticBuilder<'_> {
353 self.diagnostic().struct_span_err_with_code(sp, msg, code)
355 // FIXME: This method should be removed (every error should have an associated error code).
356 pub fn struct_err(&self, msg: &str) -> DiagnosticBuilder<'_> {
357 self.diagnostic().struct_err(msg)
359 pub fn struct_err_with_code(&self, msg: &str, code: DiagnosticId) -> DiagnosticBuilder<'_> {
360 self.diagnostic().struct_err_with_code(msg, code)
362 pub fn struct_span_fatal<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> DiagnosticBuilder<'_> {
363 self.diagnostic().struct_span_fatal(sp, msg)
365 pub fn struct_span_fatal_with_code<S: Into<MultiSpan>>(
370 ) -> DiagnosticBuilder<'_> {
371 self.diagnostic().struct_span_fatal_with_code(sp, msg, code)
373 pub fn struct_fatal(&self, msg: &str) -> DiagnosticBuilder<'_> {
374 self.diagnostic().struct_fatal(msg)
377 pub fn span_fatal<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> ! {
378 self.diagnostic().span_fatal(sp, msg)
380 pub fn span_fatal_with_code<S: Into<MultiSpan>>(
386 self.diagnostic().span_fatal_with_code(sp, msg, code)
388 pub fn fatal(&self, msg: &str) -> ! {
389 self.diagnostic().fatal(msg).raise()
391 pub fn span_err_or_warn<S: Into<MultiSpan>>(&self, is_warning: bool, sp: S, msg: &str) {
393 self.span_warn(sp, msg);
395 self.span_err(sp, msg);
398 pub fn span_err<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
399 self.diagnostic().span_err(sp, msg)
401 pub fn span_err_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: DiagnosticId) {
402 self.diagnostic().span_err_with_code(sp, &msg, code)
404 pub fn err(&self, msg: &str) {
405 self.diagnostic().err(msg)
407 pub fn emit_err<'a>(&'a self, err: impl SessionDiagnostic<'a>) {
408 err.into_diagnostic(self).emit()
411 pub fn err_count(&self) -> usize {
412 self.diagnostic().err_count()
414 pub fn has_errors(&self) -> bool {
415 self.diagnostic().has_errors()
417 pub fn has_errors_or_delayed_span_bugs(&self) -> bool {
418 self.diagnostic().has_errors_or_delayed_span_bugs()
420 pub fn abort_if_errors(&self) {
421 self.diagnostic().abort_if_errors();
423 pub fn compile_status(&self) -> Result<(), ErrorReported> {
424 if self.has_errors() {
425 self.diagnostic().emit_stashed_diagnostics();
431 // FIXME(matthewjasper) Remove this method, it should never be needed.
432 pub fn track_errors<F, T>(&self, f: F) -> Result<T, ErrorReported>
436 let old_count = self.err_count();
438 if self.err_count() == old_count { Ok(result) } else { Err(ErrorReported) }
440 pub fn span_warn<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
441 self.diagnostic().span_warn(sp, msg)
443 pub fn span_warn_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: DiagnosticId) {
444 self.diagnostic().span_warn_with_code(sp, msg, code)
446 pub fn warn(&self, msg: &str) {
447 self.diagnostic().warn(msg)
449 /// Delay a span_bug() call until abort_if_errors()
451 pub fn delay_span_bug<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
452 self.diagnostic().delay_span_bug(sp, msg)
455 /// Used for code paths of expensive computations that should only take place when
456 /// warnings or errors are emitted. If no messages are emitted ("good path"), then
457 /// it's likely a bug.
458 pub fn delay_good_path_bug(&self, msg: &str) {
459 if self.opts.debugging_opts.print_type_sizes
460 || self.opts.debugging_opts.query_dep_graph
461 || self.opts.debugging_opts.dump_mir.is_some()
462 || self.opts.debugging_opts.unpretty.is_some()
463 || self.opts.output_types.contains_key(&OutputType::Mir)
464 || std::env::var_os("RUSTC_LOG").is_some()
469 self.diagnostic().delay_good_path_bug(msg)
472 pub fn note_without_error(&self, msg: &str) {
473 self.diagnostic().note_without_error(msg)
475 pub fn span_note_without_error<S: Into<MultiSpan>>(&self, sp: S, msg: &str) {
476 self.diagnostic().span_note_without_error(sp, msg)
478 pub fn struct_note_without_error(&self, msg: &str) -> DiagnosticBuilder<'_> {
479 self.diagnostic().struct_note_without_error(msg)
483 pub fn diagnostic(&self) -> &rustc_errors::Handler {
484 &self.parse_sess.span_diagnostic
487 pub fn with_disabled_diagnostic<T, F: FnOnce() -> T>(&self, f: F) -> T {
488 self.parse_sess.span_diagnostic.with_disabled_diagnostic(f)
491 /// Analogous to calling methods on the given `DiagnosticBuilder`, but
492 /// deduplicates on lint ID, span (if any), and message for this `Session`
493 fn diag_once<'a, 'b>(
495 diag_builder: &'b mut DiagnosticBuilder<'a>,
496 method: DiagnosticBuilderMethod,
497 msg_id: DiagnosticMessageId,
499 span_maybe: Option<Span>,
501 let id_span_message = (msg_id, span_maybe, message.to_owned());
502 let fresh = self.one_time_diagnostics.borrow_mut().insert(id_span_message);
505 DiagnosticBuilderMethod::Note => {
506 diag_builder.note(message);
508 DiagnosticBuilderMethod::SpanNote => {
509 let span = span_maybe.expect("`span_note` needs a span");
510 diag_builder.span_note(span, message);
516 pub fn diag_span_note_once<'a, 'b>(
518 diag_builder: &'b mut DiagnosticBuilder<'a>,
519 msg_id: DiagnosticMessageId,
525 DiagnosticBuilderMethod::SpanNote,
532 pub fn diag_note_once<'a, 'b>(
534 diag_builder: &'b mut DiagnosticBuilder<'a>,
535 msg_id: DiagnosticMessageId,
538 self.diag_once(diag_builder, DiagnosticBuilderMethod::Note, msg_id, message, None);
542 pub fn source_map(&self) -> &SourceMap {
543 self.parse_sess.source_map()
545 pub fn verbose(&self) -> bool {
546 self.opts.debugging_opts.verbose
548 pub fn time_passes(&self) -> bool {
549 self.opts.debugging_opts.time_passes || self.opts.debugging_opts.time
551 pub fn instrument_mcount(&self) -> bool {
552 self.opts.debugging_opts.instrument_mcount
554 pub fn time_llvm_passes(&self) -> bool {
555 self.opts.debugging_opts.time_llvm_passes
557 pub fn meta_stats(&self) -> bool {
558 self.opts.debugging_opts.meta_stats
560 pub fn asm_comments(&self) -> bool {
561 self.opts.debugging_opts.asm_comments
563 pub fn verify_llvm_ir(&self) -> bool {
564 self.opts.debugging_opts.verify_llvm_ir || option_env!("RUSTC_VERIFY_LLVM_IR").is_some()
566 pub fn print_llvm_passes(&self) -> bool {
567 self.opts.debugging_opts.print_llvm_passes
569 pub fn binary_dep_depinfo(&self) -> bool {
570 self.opts.debugging_opts.binary_dep_depinfo
572 pub fn mir_opt_level(&self) -> usize {
576 .unwrap_or_else(|| if self.opts.optimize != config::OptLevel::No { 2 } else { 1 })
579 /// Gets the features enabled for the current compilation session.
580 /// DO NOT USE THIS METHOD if there is a TyCtxt available, as it circumvents
581 /// dependency tracking. Use tcx.features() instead.
583 pub fn features_untracked(&self) -> &rustc_feature::Features {
584 self.features.get().unwrap()
587 pub fn init_features(&self, features: rustc_feature::Features) {
588 match self.features.set(features) {
590 Err(_) => panic!("`features` was initialized twice"),
594 pub fn init_lint_store(&self, lint_store: Lrc<dyn SessionLintStore>) {
598 .expect("`lint_store` was initialized twice");
601 /// Calculates the flavor of LTO to use for this compilation.
602 pub fn lto(&self) -> config::Lto {
603 // If our target has codegen requirements ignore the command line
604 if self.target.requires_lto {
605 return config::Lto::Fat;
608 // If the user specified something, return that. If they only said `-C
609 // lto` and we've for whatever reason forced off ThinLTO via the CLI,
610 // then ensure we can't use a ThinLTO.
611 match self.opts.cg.lto {
612 config::LtoCli::Unspecified => {
613 // The compiler was invoked without the `-Clto` flag. Fall
614 // through to the default handling
616 config::LtoCli::No => {
617 // The user explicitly opted out of any kind of LTO
618 return config::Lto::No;
620 config::LtoCli::Yes | config::LtoCli::Fat | config::LtoCli::NoParam => {
621 // All of these mean fat LTO
622 return config::Lto::Fat;
624 config::LtoCli::Thin => {
625 return if self.opts.cli_forced_thinlto_off {
633 // Ok at this point the target doesn't require anything and the user
634 // hasn't asked for anything. Our next decision is whether or not
635 // we enable "auto" ThinLTO where we use multiple codegen units and
636 // then do ThinLTO over those codegen units. The logic below will
637 // either return `No` or `ThinLocal`.
639 // If processing command line options determined that we're incompatible
640 // with ThinLTO (e.g., `-C lto --emit llvm-ir`) then return that option.
641 if self.opts.cli_forced_thinlto_off {
642 return config::Lto::No;
645 // If `-Z thinlto` specified process that, but note that this is mostly
646 // a deprecated option now that `-C lto=thin` exists.
647 if let Some(enabled) = self.opts.debugging_opts.thinlto {
649 return config::Lto::ThinLocal;
651 return config::Lto::No;
655 // If there's only one codegen unit and LTO isn't enabled then there's
656 // no need for ThinLTO so just return false.
657 if self.codegen_units() == 1 {
658 return config::Lto::No;
661 // Now we're in "defaults" territory. By default we enable ThinLTO for
662 // optimized compiles (anything greater than O0).
663 match self.opts.optimize {
664 config::OptLevel::No => config::Lto::No,
665 _ => config::Lto::ThinLocal,
669 /// Returns the panic strategy for this compile session. If the user explicitly selected one
670 /// using '-C panic', use that, otherwise use the panic strategy defined by the target.
671 pub fn panic_strategy(&self) -> PanicStrategy {
672 self.opts.cg.panic.unwrap_or(self.target.panic_strategy)
674 pub fn fewer_names(&self) -> bool {
675 if let Some(fewer_names) = self.opts.debugging_opts.fewer_names {
678 let more_names = self.opts.output_types.contains_key(&OutputType::LlvmAssembly)
679 || self.opts.output_types.contains_key(&OutputType::Bitcode)
680 // AddressSanitizer and MemorySanitizer use alloca name when reporting an issue.
681 || self.opts.debugging_opts.sanitizer.intersects(SanitizerSet::ADDRESS | SanitizerSet::MEMORY);
686 pub fn unstable_options(&self) -> bool {
687 self.opts.debugging_opts.unstable_options
689 pub fn is_nightly_build(&self) -> bool {
690 self.opts.unstable_features.is_nightly_build()
692 pub fn overflow_checks(&self) -> bool {
696 .or(self.opts.debugging_opts.force_overflow_checks)
697 .unwrap_or(self.opts.debug_assertions)
700 /// Check whether this compile session and crate type use static crt.
701 pub fn crt_static(&self, crate_type: Option<CrateType>) -> bool {
702 if !self.target.crt_static_respected {
703 // If the target does not opt in to crt-static support, use its default.
704 return self.target.crt_static_default;
707 let requested_features = self.opts.cg.target_feature.split(',');
708 let found_negative = requested_features.clone().any(|r| r == "-crt-static");
709 let found_positive = requested_features.clone().any(|r| r == "+crt-static");
711 if found_positive || found_negative {
713 } else if crate_type == Some(CrateType::ProcMacro)
714 || crate_type == None && self.opts.crate_types.contains(&CrateType::ProcMacro)
716 // FIXME: When crate_type is not available,
717 // we use compiler options to determine the crate_type.
718 // We can't check `#![crate_type = "proc-macro"]` here.
721 self.target.crt_static_default
725 pub fn relocation_model(&self) -> RelocModel {
726 self.opts.cg.relocation_model.unwrap_or(self.target.relocation_model)
729 pub fn code_model(&self) -> Option<CodeModel> {
730 self.opts.cg.code_model.or(self.target.code_model)
733 pub fn tls_model(&self) -> TlsModel {
734 self.opts.debugging_opts.tls_model.unwrap_or(self.target.tls_model)
737 pub fn is_wasi_reactor(&self) -> bool {
738 self.target.options.os == "wasi"
740 self.opts.debugging_opts.wasi_exec_model,
741 Some(config::WasiExecModel::Reactor)
745 pub fn split_debuginfo(&self) -> SplitDebuginfo {
746 self.opts.cg.split_debuginfo.unwrap_or(self.target.split_debuginfo)
749 pub fn target_can_use_split_dwarf(&self) -> bool {
750 !self.target.is_like_windows && !self.target.is_like_osx
753 pub fn must_emit_unwind_tables(&self) -> bool {
754 // This is used to control the emission of the `uwtable` attribute on
757 // Unwind tables are needed when compiling with `-C panic=unwind`, but
758 // LLVM won't omit unwind tables unless the function is also marked as
759 // `nounwind`, so users are allowed to disable `uwtable` emission.
760 // Historically rustc always emits `uwtable` attributes by default, so
761 // even they can be disabled, they're still emitted by default.
763 // On some targets (including windows), however, exceptions include
764 // other events such as illegal instructions, segfaults, etc. This means
765 // that on Windows we end up still needing unwind tables even if the `-C
766 // panic=abort` flag is passed.
768 // You can also find more info on why Windows needs unwind tables in:
769 // https://bugzilla.mozilla.org/show_bug.cgi?id=1302078
771 // If a target requires unwind tables, then they must be emitted.
772 // Otherwise, we can defer to the `-C force-unwind-tables=<yes/no>`
773 // value, if it is provided, or disable them, if not.
774 self.target.requires_uwtable
775 || self.opts.cg.force_unwind_tables.unwrap_or(
776 self.panic_strategy() == PanicStrategy::Unwind || self.target.default_uwtable,
780 pub fn generate_proc_macro_decls_symbol(&self, stable_crate_id: StableCrateId) -> String {
781 format!("__rustc_proc_macro_decls_{:08x}__", stable_crate_id.to_u64())
784 pub fn target_filesearch(&self, kind: PathKind) -> filesearch::FileSearch<'_> {
785 filesearch::FileSearch::new(
787 self.opts.target_triple.triple(),
788 &self.opts.search_paths,
789 &self.target_tlib_path,
793 pub fn host_filesearch(&self, kind: PathKind) -> filesearch::FileSearch<'_> {
794 filesearch::FileSearch::new(
796 config::host_triple(),
797 &self.opts.search_paths,
798 &self.host_tlib_path,
803 /// Returns a list of directories where target-specific tool binaries are located.
804 pub fn get_tools_search_paths(&self, self_contained: bool) -> Vec<PathBuf> {
805 let rustlib_path = rustc_target::target_rustlib_path(&self.sysroot, &config::host_triple());
806 let p = std::array::IntoIter::new([
807 Path::new(&self.sysroot),
808 Path::new(&rustlib_path),
811 .collect::<PathBuf>();
812 if self_contained { vec![p.clone(), p.join("self-contained")] } else { vec![p] }
815 pub fn init_incr_comp_session(
817 session_dir: PathBuf,
818 lock_file: flock::Lock,
819 load_dep_graph: bool,
821 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
823 if let IncrCompSession::NotInitialized = *incr_comp_session {
825 panic!("Trying to initialize IncrCompSession `{:?}`", *incr_comp_session)
829 IncrCompSession::Active { session_directory: session_dir, lock_file, load_dep_graph };
832 pub fn finalize_incr_comp_session(&self, new_directory_path: PathBuf) {
833 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
835 if let IncrCompSession::Active { .. } = *incr_comp_session {
837 panic!("trying to finalize `IncrCompSession` `{:?}`", *incr_comp_session);
840 // Note: this will also drop the lock file, thus unlocking the directory.
841 *incr_comp_session = IncrCompSession::Finalized { session_directory: new_directory_path };
844 pub fn mark_incr_comp_session_as_invalid(&self) {
845 let mut incr_comp_session = self.incr_comp_session.borrow_mut();
847 let session_directory = match *incr_comp_session {
848 IncrCompSession::Active { ref session_directory, .. } => session_directory.clone(),
849 IncrCompSession::InvalidBecauseOfErrors { .. } => return,
850 _ => panic!("trying to invalidate `IncrCompSession` `{:?}`", *incr_comp_session),
853 // Note: this will also drop the lock file, thus unlocking the directory.
854 *incr_comp_session = IncrCompSession::InvalidBecauseOfErrors { session_directory };
857 pub fn incr_comp_session_dir(&self) -> cell::Ref<'_, PathBuf> {
858 let incr_comp_session = self.incr_comp_session.borrow();
859 cell::Ref::map(incr_comp_session, |incr_comp_session| match *incr_comp_session {
860 IncrCompSession::NotInitialized => panic!(
861 "trying to get session directory from `IncrCompSession`: {:?}",
864 IncrCompSession::Active { ref session_directory, .. }
865 | IncrCompSession::Finalized { ref session_directory }
866 | IncrCompSession::InvalidBecauseOfErrors { ref session_directory } => {
872 pub fn incr_comp_session_dir_opt(&self) -> Option<cell::Ref<'_, PathBuf>> {
873 self.opts.incremental.as_ref().map(|_| self.incr_comp_session_dir())
876 pub fn print_perf_stats(&self) {
878 "Total time spent computing symbol hashes: {}",
879 duration_to_secs_str(*self.perf_stats.symbol_hash_time.lock())
882 "Total queries canonicalized: {}",
883 self.perf_stats.queries_canonicalized.load(Ordering::Relaxed)
886 "normalize_generic_arg_after_erasing_regions: {}",
887 self.perf_stats.normalize_generic_arg_after_erasing_regions.load(Ordering::Relaxed)
890 "normalize_projection_ty: {}",
891 self.perf_stats.normalize_projection_ty.load(Ordering::Relaxed)
895 /// We want to know if we're allowed to do an optimization for crate foo from -z fuel=foo=n.
896 /// This expends fuel if applicable, and records fuel if applicable.
897 pub fn consider_optimizing<T: Fn() -> String>(&self, crate_name: &str, msg: T) -> bool {
899 if let Some(ref c) = self.optimization_fuel_crate {
901 assert_eq!(self.threads(), 1);
902 let mut fuel = self.optimization_fuel.lock();
903 ret = fuel.remaining != 0;
904 if fuel.remaining == 0 && !fuel.out_of_fuel {
905 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.debugging_opts.instrument_coverage.unwrap_or(config::InstrumentCoverage::Off)
1054 != config::InstrumentCoverage::Off
1057 pub fn instrument_coverage_except_unused_generics(&self) -> bool {
1058 self.opts.debugging_opts.instrument_coverage.unwrap_or(config::InstrumentCoverage::Off)
1059 == config::InstrumentCoverage::ExceptUnusedGenerics
1062 pub fn instrument_coverage_except_unused_functions(&self) -> bool {
1063 self.opts.debugging_opts.instrument_coverage.unwrap_or(config::InstrumentCoverage::Off)
1064 == config::InstrumentCoverage::ExceptUnusedFunctions
1067 pub fn is_proc_macro_attr(&self, attr: &Attribute) -> bool {
1068 [sym::proc_macro, sym::proc_macro_attribute, sym::proc_macro_derive]
1070 .any(|kind| attr.has_name(*kind))
1073 pub fn contains_name(&self, attrs: &[Attribute], name: Symbol) -> bool {
1074 attrs.iter().any(|item| item.has_name(name))
1077 pub fn find_by_name<'a>(
1079 attrs: &'a [Attribute],
1081 ) -> Option<&'a Attribute> {
1082 attrs.iter().find(|attr| attr.has_name(name))
1085 pub fn filter_by_name<'a>(
1087 attrs: &'a [Attribute],
1089 ) -> impl Iterator<Item = &'a Attribute> {
1090 attrs.iter().filter(move |attr| attr.has_name(name))
1093 pub fn first_attr_value_str_by_name(
1095 attrs: &[Attribute],
1097 ) -> Option<Symbol> {
1098 attrs.iter().find(|at| at.has_name(name)).and_then(|at| at.value_str())
1103 sopts: &config::Options,
1104 registry: rustc_errors::registry::Registry,
1105 source_map: Lrc<SourceMap>,
1106 emitter_dest: Option<Box<dyn Write + Send>>,
1107 ) -> Box<dyn Emitter + sync::Send> {
1108 let macro_backtrace = sopts.debugging_opts.macro_backtrace;
1109 match (sopts.error_format, emitter_dest) {
1110 (config::ErrorOutputType::HumanReadable(kind), dst) => {
1111 let (short, color_config) = kind.unzip();
1113 if let HumanReadableErrorType::AnnotateSnippet(_) = kind {
1115 AnnotateSnippetEmitterWriter::new(Some(source_map), short, macro_backtrace);
1116 Box::new(emitter.ui_testing(sopts.debugging_opts.ui_testing))
1118 let emitter = match dst {
1119 None => EmitterWriter::stderr(
1123 sopts.debugging_opts.teach,
1124 sopts.debugging_opts.terminal_width,
1127 Some(dst) => EmitterWriter::new(
1131 false, // no teach messages when writing to a buffer
1132 false, // no colors when writing to a buffer
1133 None, // no terminal width
1137 Box::new(emitter.ui_testing(sopts.debugging_opts.ui_testing))
1140 (config::ErrorOutputType::Json { pretty, json_rendered }, None) => Box::new(
1141 JsonEmitter::stderr(
1146 sopts.debugging_opts.terminal_width,
1149 .ui_testing(sopts.debugging_opts.ui_testing),
1151 (config::ErrorOutputType::Json { pretty, json_rendered }, Some(dst)) => Box::new(
1158 sopts.debugging_opts.terminal_width,
1161 .ui_testing(sopts.debugging_opts.ui_testing),
1166 pub enum DiagnosticOutput {
1168 Raw(Box<dyn Write + Send>),
1171 pub fn build_session(
1172 sopts: config::Options,
1173 local_crate_source_file: Option<PathBuf>,
1174 registry: rustc_errors::registry::Registry,
1175 diagnostics_output: DiagnosticOutput,
1176 driver_lint_caps: FxHashMap<lint::LintId, lint::Level>,
1177 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
1178 target_override: Option<Target>,
1180 // FIXME: This is not general enough to make the warning lint completely override
1181 // normal diagnostic warnings, since the warning lint can also be denied and changed
1182 // later via the source code.
1183 let warnings_allow = sopts
1186 .filter(|&&(ref key, _)| *key == "warnings")
1187 .map(|&(_, ref level)| *level == lint::Allow)
1190 let cap_lints_allow = sopts.lint_cap.map_or(false, |cap| cap == lint::Allow);
1191 let can_emit_warnings = !(warnings_allow || cap_lints_allow);
1193 let write_dest = match diagnostics_output {
1194 DiagnosticOutput::Default => None,
1195 DiagnosticOutput::Raw(write) => Some(write),
1198 let sysroot = match &sopts.maybe_sysroot {
1199 Some(sysroot) => sysroot.clone(),
1200 None => filesearch::get_or_default_sysroot(),
1203 let target_cfg = config::build_target_config(&sopts, target_override, &sysroot);
1204 let host_triple = TargetTriple::from_triple(config::host_triple());
1205 let (host, target_warnings) = Target::search(&host_triple, &sysroot).unwrap_or_else(|e| {
1206 early_error(sopts.error_format, &format!("Error loading host specification: {}", e))
1208 for warning in target_warnings.warning_messages() {
1209 early_warn(sopts.error_format, &warning)
1212 let loader = file_loader.unwrap_or_else(|| Box::new(RealFileLoader));
1213 let hash_kind = sopts.debugging_opts.src_hash_algorithm.unwrap_or_else(|| {
1214 if target_cfg.is_like_msvc {
1215 SourceFileHashAlgorithm::Sha1
1217 SourceFileHashAlgorithm::Md5
1220 let source_map = Lrc::new(SourceMap::with_file_loader_and_hash_kind(
1222 sopts.file_path_mapping(),
1225 let emitter = default_emitter(&sopts, registry, source_map.clone(), write_dest);
1227 let span_diagnostic = rustc_errors::Handler::with_emitter_and_flags(
1229 sopts.debugging_opts.diagnostic_handler_flags(can_emit_warnings),
1232 let self_profiler = if let SwitchWithOptPath::Enabled(ref d) = sopts.debugging_opts.self_profile
1235 if let Some(ref directory) = d { directory } else { std::path::Path::new(".") };
1237 let profiler = SelfProfiler::new(
1239 sopts.crate_name.as_deref(),
1240 &sopts.debugging_opts.self_profile_events,
1243 Ok(profiler) => Some(Arc::new(profiler)),
1245 early_warn(sopts.error_format, &format!("failed to create profiler: {}", e));
1253 let mut parse_sess = ParseSess::with_span_handler(span_diagnostic, source_map);
1254 parse_sess.assume_incomplete_release = sopts.debugging_opts.assume_incomplete_release;
1256 let host_triple = config::host_triple();
1257 let target_triple = sopts.target_triple.triple();
1258 let host_tlib_path = Lrc::new(SearchPath::from_sysroot_and_triple(&sysroot, host_triple));
1259 let target_tlib_path = if host_triple == target_triple {
1260 // Use the same `SearchPath` if host and target triple are identical to avoid unnecessary
1261 // rescanning of the target lib path and an unnecessary allocation.
1262 host_tlib_path.clone()
1264 Lrc::new(SearchPath::from_sysroot_and_triple(&sysroot, target_triple))
1267 let file_path_mapping = sopts.file_path_mapping();
1269 let local_crate_source_file =
1270 local_crate_source_file.map(|path| file_path_mapping.map_prefix(path).0);
1272 let optimization_fuel_crate = sopts.debugging_opts.fuel.as_ref().map(|i| i.0.clone());
1273 let optimization_fuel = Lock::new(OptimizationFuel {
1274 remaining: sopts.debugging_opts.fuel.as_ref().map_or(0, |i| i.1),
1277 let print_fuel = AtomicU64::new(0);
1279 let cgu_reuse_tracker = if sopts.debugging_opts.query_dep_graph {
1280 CguReuseTracker::new()
1282 CguReuseTracker::new_disabled()
1285 let prof = SelfProfilerRef::new(
1287 sopts.debugging_opts.time_passes || sopts.debugging_opts.time,
1288 sopts.debugging_opts.time_passes,
1291 let ctfe_backtrace = Lock::new(match env::var("RUSTC_CTFE_BACKTRACE") {
1292 Ok(ref val) if val == "immediate" => CtfeBacktrace::Immediate,
1293 Ok(ref val) if val != "0" => CtfeBacktrace::Capture,
1294 _ => CtfeBacktrace::Disabled,
1298 if target_cfg.allow_asm { InlineAsmArch::from_str(&target_cfg.arch).ok() } else { None };
1300 let sess = Session {
1308 local_crate_source_file,
1309 one_time_diagnostics: Default::default(),
1310 crate_types: OnceCell::new(),
1311 stable_crate_id: OnceCell::new(),
1312 features: OnceCell::new(),
1313 lint_store: OnceCell::new(),
1314 incr_comp_session: OneThread::new(RefCell::new(IncrCompSession::NotInitialized)),
1317 perf_stats: PerfStats {
1318 symbol_hash_time: Lock::new(Duration::from_secs(0)),
1319 queries_canonicalized: AtomicUsize::new(0),
1320 normalize_generic_arg_after_erasing_regions: AtomicUsize::new(0),
1321 normalize_projection_ty: AtomicUsize::new(0),
1323 code_stats: Default::default(),
1324 optimization_fuel_crate,
1327 jobserver: jobserver::client(),
1330 miri_unleashed_features: Lock::new(Default::default()),
1332 target_features: FxHashSet::default(),
1335 validate_commandline_args_with_session_available(&sess);
1340 // If it is useful to have a Session available already for validating a
1341 // commandline argument, you can do so here.
1342 fn validate_commandline_args_with_session_available(sess: &Session) {
1343 // Since we don't know if code in an rlib will be linked to statically or
1344 // dynamically downstream, rustc generates `__imp_` symbols that help linkers
1345 // on Windows deal with this lack of knowledge (#27438). Unfortunately,
1346 // these manually generated symbols confuse LLD when it tries to merge
1347 // bitcode during ThinLTO. Therefore we disallow dynamic linking on Windows
1348 // when compiling for LLD ThinLTO. This way we can validly just not generate
1349 // the `dllimport` attributes and `__imp_` symbols in that case.
1350 if sess.opts.cg.linker_plugin_lto.enabled()
1351 && sess.opts.cg.prefer_dynamic
1352 && sess.target.is_like_windows
1355 "Linker plugin based LTO is not supported together with \
1356 `-C prefer-dynamic` when targeting Windows-like targets",
1360 // Make sure that any given profiling data actually exists so LLVM can't
1361 // decide to silently skip PGO.
1362 if let Some(ref path) = sess.opts.cg.profile_use {
1365 "File `{}` passed to `-C profile-use` does not exist.",
1371 // Unwind tables cannot be disabled if the target requires them.
1372 if let Some(include_uwtables) = sess.opts.cg.force_unwind_tables {
1373 if sess.target.requires_uwtable && !include_uwtables {
1375 "target requires unwind tables, they cannot be disabled with \
1376 `-C force-unwind-tables=no`.",
1381 // Sanitizers can only be used on platforms that we know have working sanitizer codegen.
1382 let supported_sanitizers = sess.target.options.supported_sanitizers;
1383 let unsupported_sanitizers = sess.opts.debugging_opts.sanitizer - supported_sanitizers;
1384 match unsupported_sanitizers.into_iter().count() {
1387 .err(&format!("{} sanitizer is not supported for this target", unsupported_sanitizers)),
1388 _ => sess.err(&format!(
1389 "{} sanitizers are not supported for this target",
1390 unsupported_sanitizers
1393 // Cannot mix and match sanitizers.
1394 let mut sanitizer_iter = sess.opts.debugging_opts.sanitizer.into_iter();
1395 if let (Some(first), Some(second)) = (sanitizer_iter.next(), sanitizer_iter.next()) {
1396 sess.err(&format!("`-Zsanitizer={}` is incompatible with `-Zsanitizer={}`", first, second));
1399 // Cannot enable crt-static with sanitizers on Linux
1400 if sess.crt_static(None) && !sess.opts.debugging_opts.sanitizer.is_empty() {
1402 "Sanitizer is incompatible with statically linked libc, \
1403 disable it using `-C target-feature=-crt-static`",
1408 /// Holds data on the current incremental compilation session, if there is one.
1410 pub enum IncrCompSession {
1411 /// This is the state the session will be in until the incr. comp. dir is
1414 /// This is the state during which the session directory is private and can
1416 Active { session_directory: PathBuf, lock_file: flock::Lock, load_dep_graph: bool },
1417 /// This is the state after the session directory has been finalized. In this
1418 /// state, the contents of the directory must not be modified any more.
1419 Finalized { session_directory: PathBuf },
1420 /// This is an error state that is reached when some compilation error has
1421 /// occurred. It indicates that the contents of the session directory must
1422 /// not be used, since they might be invalid.
1423 InvalidBecauseOfErrors { session_directory: PathBuf },
1426 pub fn early_error_no_abort(output: config::ErrorOutputType, msg: &str) {
1427 let emitter: Box<dyn Emitter + sync::Send> = match output {
1428 config::ErrorOutputType::HumanReadable(kind) => {
1429 let (short, color_config) = kind.unzip();
1430 Box::new(EmitterWriter::stderr(color_config, None, short, false, None, false))
1432 config::ErrorOutputType::Json { pretty, json_rendered } => {
1433 Box::new(JsonEmitter::basic(pretty, json_rendered, None, false))
1436 let handler = rustc_errors::Handler::with_emitter(true, None, emitter);
1437 handler.struct_fatal(msg).emit();
1440 pub fn early_error(output: config::ErrorOutputType, msg: &str) -> ! {
1441 early_error_no_abort(output, msg);
1442 rustc_errors::FatalError.raise();
1445 pub fn early_warn(output: config::ErrorOutputType, msg: &str) {
1446 let emitter: Box<dyn Emitter + sync::Send> = match output {
1447 config::ErrorOutputType::HumanReadable(kind) => {
1448 let (short, color_config) = kind.unzip();
1449 Box::new(EmitterWriter::stderr(color_config, None, short, false, None, false))
1451 config::ErrorOutputType::Json { pretty, json_rendered } => {
1452 Box::new(JsonEmitter::basic(pretty, json_rendered, None, false))
1455 let handler = rustc_errors::Handler::with_emitter(true, None, emitter);
1456 handler.struct_warn(msg).emit();