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
::{SanitizerSet, SplitDebuginfo, Target, TargetTriple, TlsModel}
;
32 use std
::cell
::{self, RefCell}
;
36 use std
::num
::NonZeroU32
;
37 use std
::ops
::{Div, Mul}
;
38 use std
::path
::{Path, PathBuf}
;
39 use std
::str::FromStr
;
41 use std
::time
::Duration
;
43 pub struct OptimizationFuel
{
44 /// If `-zfuel=crate=n` is specified, initially set to `n`, otherwise `0`.
46 /// We're rejecting all further optimizations.
50 /// The behavior of the CTFE engine when an error occurs with regards to backtraces.
51 #[derive(Clone, Copy)]
52 pub enum CtfeBacktrace
{
53 /// Do nothing special, return the error as usual without a backtrace.
55 /// Capture a backtrace at the point the error is created and return it in the error
56 /// (to be printed later if/when the error ever actually gets shown to the user).
58 /// Capture a backtrace at the point the error is created and immediately print it out.
62 /// New-type wrapper around `usize` for representing limits. Ensures that comparisons against
63 /// limits are consistent throughout the compiler.
64 #[derive(Clone, Copy, Debug, HashStable_Generic)]
65 pub struct Limit(pub usize);
68 /// Create a new limit from a `usize`.
69 pub fn new(value
: usize) -> Self {
73 /// Check that `value` is within the limit. Ensures that the same comparisons are used
74 /// throughout the compiler, as mismatches can cause ICEs, see #72540.
76 pub fn value_within_limit(&self, value
: usize) -> bool
{
81 impl From
<usize> for Limit
{
82 fn from(value
: usize) -> Self {
87 impl fmt
::Display
for Limit
{
88 fn fmt(&self, f
: &mut fmt
::Formatter
<'_
>) -> fmt
::Result
{
89 write
!(f
, "{}", self.0)
93 impl Div
<usize> for Limit
{
96 fn div(self, rhs
: usize) -> Self::Output
{
97 Limit
::new(self.0 / rhs
)
101 impl Mul
<usize> for Limit
{
104 fn mul(self, rhs
: usize) -> Self::Output
{
105 Limit
::new(self.0 * rhs
)
109 #[derive(Clone, Copy, Debug, HashStable_Generic)]
111 /// The maximum recursion limit for potentially infinitely recursive
112 /// operations such as auto-dereference and monomorphization.
113 pub recursion_limit
: Limit
,
114 /// The size at which the `large_assignments` lint starts
116 pub move_size_limit
: Limit
,
117 /// The maximum length of types during monomorphization.
118 pub type_length_limit
: Limit
,
119 /// The maximum blocks a const expression can evaluate.
120 pub const_eval_limit
: Limit
,
123 /// Represents the data associated with a compilation
124 /// session for a single crate.
128 pub opts
: config
::Options
,
129 pub host_tlib_path
: Lrc
<SearchPath
>,
130 pub target_tlib_path
: Lrc
<SearchPath
>,
131 pub parse_sess
: ParseSess
,
132 pub sysroot
: PathBuf
,
133 /// The name of the root source file of the crate, in the local file system.
134 /// `None` means that there is no source file.
135 pub local_crate_source_file
: Option
<PathBuf
>,
137 /// Set of `(DiagnosticId, Option<Span>, message)` tuples tracking
138 /// (sub)diagnostics that have been set once, but should not be set again,
139 /// in order to avoid redundantly verbose output (Issue #24690, #44953).
140 pub one_time_diagnostics
: Lock
<FxHashSet
<(DiagnosticMessageId
, Option
<Span
>, String
)>>,
141 crate_types
: OnceCell
<Vec
<CrateType
>>,
142 /// The `stable_crate_id` is constructed out of the crate name and all the
143 /// `-C metadata` arguments passed to the compiler. Its value forms a unique
144 /// global identifier for the crate. It is used to allow multiple crates
145 /// with the same name to coexist. See the
146 /// `rustc_codegen_llvm::back::symbol_names` module for more information.
147 pub stable_crate_id
: OnceCell
<StableCrateId
>,
149 features
: OnceCell
<rustc_feature
::Features
>,
151 incr_comp_session
: OneThread
<RefCell
<IncrCompSession
>>,
152 /// Used for incremental compilation tests. Will only be populated if
153 /// `-Zquery-dep-graph` is specified.
154 pub cgu_reuse_tracker
: CguReuseTracker
,
156 /// Used by `-Z self-profile`.
157 pub prof
: SelfProfilerRef
,
159 /// Some measurements that are being gathered during compilation.
160 pub perf_stats
: PerfStats
,
162 /// Data about code being compiled, gathered during compilation.
163 pub code_stats
: CodeStats
,
165 /// Tracks fuel info if `-zfuel=crate=n` is specified.
166 optimization_fuel
: Lock
<OptimizationFuel
>,
168 /// Always set to zero and incremented so that we can print fuel expended by a crate.
169 pub print_fuel
: AtomicU64
,
171 /// Loaded up early on in the initialization of this `Session` to avoid
172 /// false positives about a job server in our environment.
173 pub jobserver
: Client
,
175 /// Cap lint level specified by a driver specifically.
176 pub driver_lint_caps
: FxHashMap
<lint
::LintId
, lint
::Level
>,
178 /// Tracks the current behavior of the CTFE engine when an error occurs.
179 /// Options range from returning the error without a backtrace to returning an error
180 /// and immediately printing the backtrace to stderr.
181 /// The `Lock` is only used by miri to allow setting `ctfe_backtrace` after analysis when
182 /// `MIRI_BACKTRACE` is set. This makes it only apply to miri's errors and not to all CTFE
184 pub ctfe_backtrace
: Lock
<CtfeBacktrace
>,
186 /// This tracks where `-Zunleash-the-miri-inside-of-you` was used to get around a
187 /// const check, optionally with the relevant feature gate. We use this to
188 /// warn about unleashing, but with a single diagnostic instead of dozens that
189 /// drown everything else in noise.
190 miri_unleashed_features
: Lock
<Vec
<(Span
, Option
<Symbol
>)>>,
192 /// Architecture to use for interpreting asm!.
193 pub asm_arch
: Option
<InlineAsmArch
>,
195 /// Set of enabled features for the current target.
196 pub target_features
: FxHashSet
<Symbol
>,
199 pub struct PerfStats
{
200 /// The accumulated time spent on computing symbol hashes.
201 pub symbol_hash_time
: Lock
<Duration
>,
202 /// Total number of values canonicalized queries constructed.
203 pub queries_canonicalized
: AtomicUsize
,
204 /// Number of times this query is invoked.
205 pub normalize_generic_arg_after_erasing_regions
: AtomicUsize
,
206 /// Number of times this query is invoked.
207 pub normalize_projection_ty
: AtomicUsize
,
210 /// Enum to support dispatch of one-time diagnostics (in `Session.diag_once`).
211 enum DiagnosticBuilderMethod
{
214 // Add more variants as needed to support one-time diagnostics.
217 /// Trait implemented by error types. This should not be implemented manually. Instead, use
218 /// `#[derive(SessionDiagnostic)]` -- see [rustc_macros::SessionDiagnostic].
219 pub trait SessionDiagnostic
<'a
> {
220 /// Write out as a diagnostic out of `sess`.
222 fn into_diagnostic(self, sess
: &'a Session
) -> DiagnosticBuilder
<'a
>;
225 /// Diagnostic message ID, used by `Session.one_time_diagnostics` to avoid
226 /// emitting the same message more than once.
227 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
228 pub enum DiagnosticMessageId
{
229 ErrorId(u16), // EXXXX error code as integer
230 LintId(lint
::LintId
),
231 StabilityId(Option
<NonZeroU32
>), // issue number
234 impl From
<&'
static lint
::Lint
> for DiagnosticMessageId
{
235 fn from(lint
: &'
static lint
::Lint
) -> Self {
236 DiagnosticMessageId
::LintId(lint
::LintId
::of(lint
))
241 pub fn miri_unleashed_feature(&self, span
: Span
, feature_gate
: Option
<Symbol
>) {
242 self.miri_unleashed_features
.lock().push((span
, feature_gate
));
245 fn check_miri_unleashed_features(&self) {
246 let unleashed_features
= self.miri_unleashed_features
.lock();
247 if !unleashed_features
.is_empty() {
248 let mut must_err
= false;
249 // Create a diagnostic pointing at where things got unleashed.
250 let mut diag
= self.struct_warn("skipping const checks");
251 for &(span
, feature_gate
) in unleashed_features
.iter() {
252 // FIXME: `span_label` doesn't do anything, so we use "help" as a hack.
253 if let Some(feature_gate
) = feature_gate
{
254 diag
.span_help(span
, &format
!("skipping check for `{}` feature", feature_gate
));
255 // The unleash flag must *not* be used to just "hack around" feature gates.
258 diag
.span_help(span
, "skipping check that does not even have a feature gate");
262 // If we should err, make sure we did.
263 if must_err
&& !self.has_errors() {
264 // We have skipped a feature gate, and not run into other errors... reject.
266 "`-Zunleash-the-miri-inside-of-you` may not be used to circumvent feature \
267 gates, except when testing error paths in the CTFE engine",
273 /// Invoked all the way at the end to finish off diagnostics printing.
274 pub fn finish_diagnostics(&self, registry
: &Registry
) {
275 self.check_miri_unleashed_features();
276 self.diagnostic().print_error_count(registry
);
277 self.emit_future_breakage();
280 fn emit_future_breakage(&self) {
281 if !self.opts
.debugging_opts
.emit_future_incompat_report
{
285 let diags
= self.diagnostic().take_future_breakage_diagnostics();
286 if diags
.is_empty() {
289 self.parse_sess
.span_diagnostic
.emit_future_breakage_report(diags
);
292 pub fn local_stable_crate_id(&self) -> StableCrateId
{
293 self.stable_crate_id
.get().copied().unwrap()
296 pub fn crate_types(&self) -> &[CrateType
] {
297 self.crate_types
.get().unwrap().as_slice()
300 pub fn init_crate_types(&self, crate_types
: Vec
<CrateType
>) {
301 self.crate_types
.set(crate_types
).expect("`crate_types` was initialized twice")
304 pub fn struct_span_warn
<S
: Into
<MultiSpan
>>(&self, sp
: S
, msg
: &str) -> DiagnosticBuilder
<'_
> {
305 self.diagnostic().struct_span_warn(sp
, msg
)
307 pub fn struct_span_force_warn
<S
: Into
<MultiSpan
>>(
311 ) -> DiagnosticBuilder
<'_
> {
312 self.diagnostic().struct_span_force_warn(sp
, msg
)
314 pub fn struct_span_warn_with_code
<S
: Into
<MultiSpan
>>(
319 ) -> DiagnosticBuilder
<'_
> {
320 self.diagnostic().struct_span_warn_with_code(sp
, msg
, code
)
322 pub fn struct_warn(&self, msg
: &str) -> DiagnosticBuilder
<'_
> {
323 self.diagnostic().struct_warn(msg
)
325 pub fn struct_force_warn(&self, msg
: &str) -> DiagnosticBuilder
<'_
> {
326 self.diagnostic().struct_force_warn(msg
)
328 pub fn struct_span_allow
<S
: Into
<MultiSpan
>>(&self, sp
: S
, msg
: &str) -> DiagnosticBuilder
<'_
> {
329 self.diagnostic().struct_span_allow(sp
, msg
)
331 pub fn struct_allow(&self, msg
: &str) -> DiagnosticBuilder
<'_
> {
332 self.diagnostic().struct_allow(msg
)
334 pub fn struct_span_err
<S
: Into
<MultiSpan
>>(&self, sp
: S
, msg
: &str) -> DiagnosticBuilder
<'_
> {
335 self.diagnostic().struct_span_err(sp
, msg
)
337 pub fn struct_span_err_with_code
<S
: Into
<MultiSpan
>>(
342 ) -> DiagnosticBuilder
<'_
> {
343 self.diagnostic().struct_span_err_with_code(sp
, msg
, code
)
345 // FIXME: This method should be removed (every error should have an associated error code).
346 pub fn struct_err(&self, msg
: &str) -> DiagnosticBuilder
<'_
> {
347 self.diagnostic().struct_err(msg
)
349 pub fn struct_err_with_code(&self, msg
: &str, code
: DiagnosticId
) -> DiagnosticBuilder
<'_
> {
350 self.diagnostic().struct_err_with_code(msg
, code
)
352 pub fn struct_span_fatal
<S
: Into
<MultiSpan
>>(&self, sp
: S
, msg
: &str) -> DiagnosticBuilder
<'_
> {
353 self.diagnostic().struct_span_fatal(sp
, msg
)
355 pub fn struct_span_fatal_with_code
<S
: Into
<MultiSpan
>>(
360 ) -> DiagnosticBuilder
<'_
> {
361 self.diagnostic().struct_span_fatal_with_code(sp
, msg
, code
)
363 pub fn struct_fatal(&self, msg
: &str) -> DiagnosticBuilder
<'_
> {
364 self.diagnostic().struct_fatal(msg
)
367 pub fn span_fatal
<S
: Into
<MultiSpan
>>(&self, sp
: S
, msg
: &str) -> ! {
368 self.diagnostic().span_fatal(sp
, msg
)
370 pub fn span_fatal_with_code
<S
: Into
<MultiSpan
>>(
376 self.diagnostic().span_fatal_with_code(sp
, msg
, code
)
378 pub fn fatal(&self, msg
: &str) -> ! {
379 self.diagnostic().fatal(msg
).raise()
381 pub fn span_err_or_warn
<S
: Into
<MultiSpan
>>(&self, is_warning
: bool
, sp
: S
, msg
: &str) {
383 self.span_warn(sp
, msg
);
385 self.span_err(sp
, msg
);
388 pub fn span_err
<S
: Into
<MultiSpan
>>(&self, sp
: S
, msg
: &str) {
389 self.diagnostic().span_err(sp
, msg
)
391 pub fn span_err_with_code
<S
: Into
<MultiSpan
>>(&self, sp
: S
, msg
: &str, code
: DiagnosticId
) {
392 self.diagnostic().span_err_with_code(sp
, &msg
, code
)
394 pub fn err(&self, msg
: &str) {
395 self.diagnostic().err(msg
)
397 pub fn emit_err
<'a
>(&'a
self, err
: impl SessionDiagnostic
<'a
>) {
398 err
.into_diagnostic(self).emit()
401 pub fn err_count(&self) -> usize {
402 self.diagnostic().err_count()
404 pub fn has_errors(&self) -> bool
{
405 self.diagnostic().has_errors()
407 pub fn has_errors_or_delayed_span_bugs(&self) -> bool
{
408 self.diagnostic().has_errors_or_delayed_span_bugs()
410 pub fn abort_if_errors(&self) {
411 self.diagnostic().abort_if_errors();
413 pub fn compile_status(&self) -> Result
<(), ErrorReported
> {
414 if self.has_errors() {
415 self.diagnostic().emit_stashed_diagnostics();
421 // FIXME(matthewjasper) Remove this method, it should never be needed.
422 pub fn track_errors
<F
, T
>(&self, f
: F
) -> Result
<T
, ErrorReported
>
426 let old_count
= self.err_count();
428 if self.err_count() == old_count { Ok(result) }
else { Err(ErrorReported) }
430 pub fn span_warn
<S
: Into
<MultiSpan
>>(&self, sp
: S
, msg
: &str) {
431 self.diagnostic().span_warn(sp
, msg
)
433 pub fn span_warn_with_code
<S
: Into
<MultiSpan
>>(&self, sp
: S
, msg
: &str, code
: DiagnosticId
) {
434 self.diagnostic().span_warn_with_code(sp
, msg
, code
)
436 pub fn warn(&self, msg
: &str) {
437 self.diagnostic().warn(msg
)
439 /// Delay a span_bug() call until abort_if_errors()
441 pub fn delay_span_bug
<S
: Into
<MultiSpan
>>(&self, sp
: S
, msg
: &str) {
442 self.diagnostic().delay_span_bug(sp
, msg
)
445 /// Used for code paths of expensive computations that should only take place when
446 /// warnings or errors are emitted. If no messages are emitted ("good path"), then
447 /// it's likely a bug.
448 pub fn delay_good_path_bug(&self, msg
: &str) {
449 if self.opts
.debugging_opts
.print_type_sizes
450 || self.opts
.debugging_opts
.query_dep_graph
451 || self.opts
.debugging_opts
.dump_mir
.is_some()
452 || self.opts
.debugging_opts
.unpretty
.is_some()
453 || self.opts
.output_types
.contains_key(&OutputType
::Mir
)
454 || std
::env
::var_os("RUSTC_LOG").is_some()
459 self.diagnostic().delay_good_path_bug(msg
)
462 pub fn note_without_error(&self, msg
: &str) {
463 self.diagnostic().note_without_error(msg
)
465 pub fn span_note_without_error
<S
: Into
<MultiSpan
>>(&self, sp
: S
, msg
: &str) {
466 self.diagnostic().span_note_without_error(sp
, msg
)
468 pub fn struct_note_without_error(&self, msg
: &str) -> DiagnosticBuilder
<'_
> {
469 self.diagnostic().struct_note_without_error(msg
)
473 pub fn diagnostic(&self) -> &rustc_errors
::Handler
{
474 &self.parse_sess
.span_diagnostic
477 pub fn with_disabled_diagnostic
<T
, F
: FnOnce() -> T
>(&self, f
: F
) -> T
{
478 self.parse_sess
.span_diagnostic
.with_disabled_diagnostic(f
)
481 /// Analogous to calling methods on the given `DiagnosticBuilder`, but
482 /// deduplicates on lint ID, span (if any), and message for this `Session`
483 fn diag_once
<'a
, 'b
>(
485 diag_builder
: &'b
mut DiagnosticBuilder
<'a
>,
486 method
: DiagnosticBuilderMethod
,
487 msg_id
: DiagnosticMessageId
,
489 span_maybe
: Option
<Span
>,
491 let id_span_message
= (msg_id
, span_maybe
, message
.to_owned());
492 let fresh
= self.one_time_diagnostics
.borrow_mut().insert(id_span_message
);
495 DiagnosticBuilderMethod
::Note
=> {
496 diag_builder
.note(message
);
498 DiagnosticBuilderMethod
::SpanNote
=> {
499 let span
= span_maybe
.expect("`span_note` needs a span");
500 diag_builder
.span_note(span
, message
);
506 pub fn diag_span_note_once
<'a
, 'b
>(
508 diag_builder
: &'b
mut DiagnosticBuilder
<'a
>,
509 msg_id
: DiagnosticMessageId
,
515 DiagnosticBuilderMethod
::SpanNote
,
522 pub fn diag_note_once
<'a
, 'b
>(
524 diag_builder
: &'b
mut DiagnosticBuilder
<'a
>,
525 msg_id
: DiagnosticMessageId
,
528 self.diag_once(diag_builder
, DiagnosticBuilderMethod
::Note
, msg_id
, message
, None
);
532 pub fn source_map(&self) -> &SourceMap
{
533 self.parse_sess
.source_map()
535 pub fn verbose(&self) -> bool
{
536 self.opts
.debugging_opts
.verbose
538 pub fn time_passes(&self) -> bool
{
539 self.opts
.debugging_opts
.time_passes
|| self.opts
.debugging_opts
.time
541 pub fn instrument_mcount(&self) -> bool
{
542 self.opts
.debugging_opts
.instrument_mcount
544 pub fn time_llvm_passes(&self) -> bool
{
545 self.opts
.debugging_opts
.time_llvm_passes
547 pub fn meta_stats(&self) -> bool
{
548 self.opts
.debugging_opts
.meta_stats
550 pub fn asm_comments(&self) -> bool
{
551 self.opts
.debugging_opts
.asm_comments
553 pub fn verify_llvm_ir(&self) -> bool
{
554 self.opts
.debugging_opts
.verify_llvm_ir
|| option_env
!("RUSTC_VERIFY_LLVM_IR").is_some()
556 pub fn print_llvm_passes(&self) -> bool
{
557 self.opts
.debugging_opts
.print_llvm_passes
559 pub fn binary_dep_depinfo(&self) -> bool
{
560 self.opts
.debugging_opts
.binary_dep_depinfo
562 pub fn mir_opt_level(&self) -> usize {
566 .unwrap_or_else(|| if self.opts
.optimize
!= config
::OptLevel
::No { 2 }
else { 1 }
)
569 /// Gets the features enabled for the current compilation session.
570 /// DO NOT USE THIS METHOD if there is a TyCtxt available, as it circumvents
571 /// dependency tracking. Use tcx.features() instead.
573 pub fn features_untracked(&self) -> &rustc_feature
::Features
{
574 self.features
.get().unwrap()
577 pub fn init_features(&self, features
: rustc_feature
::Features
) {
578 match self.features
.set(features
) {
580 Err(_
) => panic
!("`features` was initialized twice"),
584 /// Calculates the flavor of LTO to use for this compilation.
585 pub fn lto(&self) -> config
::Lto
{
586 // If our target has codegen requirements ignore the command line
587 if self.target
.requires_lto
{
588 return config
::Lto
::Fat
;
591 // If the user specified something, return that. If they only said `-C
592 // lto` and we've for whatever reason forced off ThinLTO via the CLI,
593 // then ensure we can't use a ThinLTO.
594 match self.opts
.cg
.lto
{
595 config
::LtoCli
::Unspecified
=> {
596 // The compiler was invoked without the `-Clto` flag. Fall
597 // through to the default handling
599 config
::LtoCli
::No
=> {
600 // The user explicitly opted out of any kind of LTO
601 return config
::Lto
::No
;
603 config
::LtoCli
::Yes
| config
::LtoCli
::Fat
| config
::LtoCli
::NoParam
=> {
604 // All of these mean fat LTO
605 return config
::Lto
::Fat
;
607 config
::LtoCli
::Thin
=> {
608 return if self.opts
.cli_forced_thinlto_off
{
616 // Ok at this point the target doesn't require anything and the user
617 // hasn't asked for anything. Our next decision is whether or not
618 // we enable "auto" ThinLTO where we use multiple codegen units and
619 // then do ThinLTO over those codegen units. The logic below will
620 // either return `No` or `ThinLocal`.
622 // If processing command line options determined that we're incompatible
623 // with ThinLTO (e.g., `-C lto --emit llvm-ir`) then return that option.
624 if self.opts
.cli_forced_thinlto_off
{
625 return config
::Lto
::No
;
628 // If `-Z thinlto` specified process that, but note that this is mostly
629 // a deprecated option now that `-C lto=thin` exists.
630 if let Some(enabled
) = self.opts
.debugging_opts
.thinlto
{
632 return config
::Lto
::ThinLocal
;
634 return config
::Lto
::No
;
638 // If there's only one codegen unit and LTO isn't enabled then there's
639 // no need for ThinLTO so just return false.
640 if self.codegen_units() == 1 {
641 return config
::Lto
::No
;
644 // Now we're in "defaults" territory. By default we enable ThinLTO for
645 // optimized compiles (anything greater than O0).
646 match self.opts
.optimize
{
647 config
::OptLevel
::No
=> config
::Lto
::No
,
648 _
=> config
::Lto
::ThinLocal
,
652 /// Returns the panic strategy for this compile session. If the user explicitly selected one
653 /// using '-C panic', use that, otherwise use the panic strategy defined by the target.
654 pub fn panic_strategy(&self) -> PanicStrategy
{
655 self.opts
.cg
.panic
.unwrap_or(self.target
.panic_strategy
)
657 pub fn fewer_names(&self) -> bool
{
658 if let Some(fewer_names
) = self.opts
.debugging_opts
.fewer_names
{
661 let more_names
= self.opts
.output_types
.contains_key(&OutputType
::LlvmAssembly
)
662 || self.opts
.output_types
.contains_key(&OutputType
::Bitcode
)
663 // AddressSanitizer and MemorySanitizer use alloca name when reporting an issue.
664 || self.opts
.debugging_opts
.sanitizer
.intersects(SanitizerSet
::ADDRESS
| SanitizerSet
::MEMORY
);
669 pub fn unstable_options(&self) -> bool
{
670 self.opts
.debugging_opts
.unstable_options
672 pub fn is_nightly_build(&self) -> bool
{
673 self.opts
.unstable_features
.is_nightly_build()
675 pub fn overflow_checks(&self) -> bool
{
679 .or(self.opts
.debugging_opts
.force_overflow_checks
)
680 .unwrap_or(self.opts
.debug_assertions
)
683 /// Check whether this compile session and crate type use static crt.
684 pub fn crt_static(&self, crate_type
: Option
<CrateType
>) -> bool
{
685 if !self.target
.crt_static_respected
{
686 // If the target does not opt in to crt-static support, use its default.
687 return self.target
.crt_static_default
;
690 let requested_features
= self.opts
.cg
.target_feature
.split('
,'
);
691 let found_negative
= requested_features
.clone().any(|r
| r
== "-crt-static");
692 let found_positive
= requested_features
.clone().any(|r
| r
== "+crt-static");
694 if found_positive
|| found_negative
{
696 } else if crate_type
== Some(CrateType
::ProcMacro
)
697 || crate_type
== None
&& self.opts
.crate_types
.contains(&CrateType
::ProcMacro
)
699 // FIXME: When crate_type is not available,
700 // we use compiler options to determine the crate_type.
701 // We can't check `#![crate_type = "proc-macro"]` here.
704 self.target
.crt_static_default
708 pub fn relocation_model(&self) -> RelocModel
{
709 self.opts
.cg
.relocation_model
.unwrap_or(self.target
.relocation_model
)
712 pub fn code_model(&self) -> Option
<CodeModel
> {
713 self.opts
.cg
.code_model
.or(self.target
.code_model
)
716 pub fn tls_model(&self) -> TlsModel
{
717 self.opts
.debugging_opts
.tls_model
.unwrap_or(self.target
.tls_model
)
720 pub fn is_wasi_reactor(&self) -> bool
{
721 self.target
.options
.os
== "wasi"
723 self.opts
.debugging_opts
.wasi_exec_model
,
724 Some(config
::WasiExecModel
::Reactor
)
728 pub fn split_debuginfo(&self) -> SplitDebuginfo
{
729 self.opts
.cg
.split_debuginfo
.unwrap_or(self.target
.split_debuginfo
)
732 pub fn target_can_use_split_dwarf(&self) -> bool
{
733 !self.target
.is_like_windows
&& !self.target
.is_like_osx
736 pub fn must_emit_unwind_tables(&self) -> bool
{
737 // This is used to control the emission of the `uwtable` attribute on
740 // Unwind tables are needed when compiling with `-C panic=unwind`, but
741 // LLVM won't omit unwind tables unless the function is also marked as
742 // `nounwind`, so users are allowed to disable `uwtable` emission.
743 // Historically rustc always emits `uwtable` attributes by default, so
744 // even they can be disabled, they're still emitted by default.
746 // On some targets (including windows), however, exceptions include
747 // other events such as illegal instructions, segfaults, etc. This means
748 // that on Windows we end up still needing unwind tables even if the `-C
749 // panic=abort` flag is passed.
751 // You can also find more info on why Windows needs unwind tables in:
752 // https://bugzilla.mozilla.org/show_bug.cgi?id=1302078
754 // If a target requires unwind tables, then they must be emitted.
755 // Otherwise, we can defer to the `-C force-unwind-tables=<yes/no>`
756 // value, if it is provided, or disable them, if not.
757 self.target
.requires_uwtable
758 || self.opts
.cg
.force_unwind_tables
.unwrap_or(
759 self.panic_strategy() == PanicStrategy
::Unwind
|| self.target
.default_uwtable
,
763 pub fn generate_proc_macro_decls_symbol(&self, stable_crate_id
: StableCrateId
) -> String
{
764 format
!("__rustc_proc_macro_decls_{:08x}__", stable_crate_id
.to_u64())
767 pub fn target_filesearch(&self, kind
: PathKind
) -> filesearch
::FileSearch
<'_
> {
768 filesearch
::FileSearch
::new(
770 self.opts
.target_triple
.triple(),
771 &self.opts
.search_paths
,
772 &self.target_tlib_path
,
776 pub fn host_filesearch(&self, kind
: PathKind
) -> filesearch
::FileSearch
<'_
> {
777 filesearch
::FileSearch
::new(
779 config
::host_triple(),
780 &self.opts
.search_paths
,
781 &self.host_tlib_path
,
786 /// Returns a list of directories where target-specific tool binaries are located.
787 pub fn get_tools_search_paths(&self, self_contained
: bool
) -> Vec
<PathBuf
> {
788 let rustlib_path
= rustc_target
::target_rustlib_path(&self.sysroot
, &config
::host_triple());
789 let p
= std
::array
::IntoIter
::new([
790 Path
::new(&self.sysroot
),
791 Path
::new(&rustlib_path
),
794 .collect
::<PathBuf
>();
795 if self_contained { vec![p.clone(), p.join("self-contained")] }
else { vec![p] }
798 pub fn init_incr_comp_session(
800 session_dir
: PathBuf
,
801 lock_file
: flock
::Lock
,
802 load_dep_graph
: bool
,
804 let mut incr_comp_session
= self.incr_comp_session
.borrow_mut();
806 if let IncrCompSession
::NotInitialized
= *incr_comp_session
{
808 panic
!("Trying to initialize IncrCompSession `{:?}`", *incr_comp_session
)
812 IncrCompSession
::Active { session_directory: session_dir, lock_file, load_dep_graph }
;
815 pub fn finalize_incr_comp_session(&self, new_directory_path
: PathBuf
) {
816 let mut incr_comp_session
= self.incr_comp_session
.borrow_mut();
818 if let IncrCompSession
::Active { .. }
= *incr_comp_session
{
820 panic
!("trying to finalize `IncrCompSession` `{:?}`", *incr_comp_session
);
823 // Note: this will also drop the lock file, thus unlocking the directory.
824 *incr_comp_session
= IncrCompSession
::Finalized { session_directory: new_directory_path }
;
827 pub fn mark_incr_comp_session_as_invalid(&self) {
828 let mut incr_comp_session
= self.incr_comp_session
.borrow_mut();
830 let session_directory
= match *incr_comp_session
{
831 IncrCompSession
::Active { ref session_directory, .. }
=> session_directory
.clone(),
832 IncrCompSession
::InvalidBecauseOfErrors { .. }
=> return,
833 _
=> panic
!("trying to invalidate `IncrCompSession` `{:?}`", *incr_comp_session
),
836 // Note: this will also drop the lock file, thus unlocking the directory.
837 *incr_comp_session
= IncrCompSession
::InvalidBecauseOfErrors { session_directory }
;
840 pub fn incr_comp_session_dir(&self) -> cell
::Ref
<'_
, PathBuf
> {
841 let incr_comp_session
= self.incr_comp_session
.borrow();
842 cell
::Ref
::map(incr_comp_session
, |incr_comp_session
| match *incr_comp_session
{
843 IncrCompSession
::NotInitialized
=> panic
!(
844 "trying to get session directory from `IncrCompSession`: {:?}",
847 IncrCompSession
::Active { ref session_directory, .. }
848 | IncrCompSession
::Finalized { ref session_directory }
849 | IncrCompSession
::InvalidBecauseOfErrors { ref session_directory }
=> {
855 pub fn incr_comp_session_dir_opt(&self) -> Option
<cell
::Ref
<'_
, PathBuf
>> {
856 self.opts
.incremental
.as_ref().map(|_
| self.incr_comp_session_dir())
859 pub fn print_perf_stats(&self) {
861 "Total time spent computing symbol hashes: {}",
862 duration_to_secs_str(*self.perf_stats
.symbol_hash_time
.lock())
865 "Total queries canonicalized: {}",
866 self.perf_stats
.queries_canonicalized
.load(Ordering
::Relaxed
)
869 "normalize_generic_arg_after_erasing_regions: {}",
870 self.perf_stats
.normalize_generic_arg_after_erasing_regions
.load(Ordering
::Relaxed
)
873 "normalize_projection_ty: {}",
874 self.perf_stats
.normalize_projection_ty
.load(Ordering
::Relaxed
)
878 /// We want to know if we're allowed to do an optimization for crate foo from -z fuel=foo=n.
879 /// This expends fuel if applicable, and records fuel if applicable.
880 pub fn consider_optimizing
<T
: Fn() -> String
>(&self, crate_name
: &str, msg
: T
) -> bool
{
882 if let Some((ref c
, _
)) = self.opts
.debugging_opts
.fuel
{
884 assert_eq
!(self.threads(), 1);
885 let mut fuel
= self.optimization_fuel
.lock();
886 ret
= fuel
.remaining
!= 0;
887 if fuel
.remaining
== 0 && !fuel
.out_of_fuel
{
888 if self.diagnostic().can_emit_warnings() {
889 // We only call `msg` in case we can actually emit warnings.
890 // Otherwise, this could cause a `delay_good_path_bug` to
891 // trigger (issue #79546).
892 self.warn(&format
!("optimization-fuel-exhausted: {}", msg()));
894 fuel
.out_of_fuel
= true;
895 } else if fuel
.remaining
> 0 {
900 if let Some(ref c
) = self.opts
.debugging_opts
.print_fuel
{
902 assert_eq
!(self.threads(), 1);
903 self.print_fuel
.fetch_add(1, SeqCst
);
909 /// Returns the number of query threads that should be used for this
911 pub fn threads(&self) -> usize {
912 self.opts
.debugging_opts
.threads
915 /// Returns the number of codegen units that should be used for this
917 pub fn codegen_units(&self) -> usize {
918 if let Some(n
) = self.opts
.cli_forced_codegen_units
{
921 if let Some(n
) = self.target
.default_codegen_units
{
925 // If incremental compilation is turned on, we default to a high number
926 // codegen units in order to reduce the "collateral damage" small
928 if self.opts
.incremental
.is_some() {
932 // Why is 16 codegen units the default all the time?
934 // The main reason for enabling multiple codegen units by default is to
935 // leverage the ability for the codegen backend to do codegen and
936 // optimization in parallel. This allows us, especially for large crates, to
937 // make good use of all available resources on the machine once we've
938 // hit that stage of compilation. Large crates especially then often
939 // take a long time in codegen/optimization and this helps us amortize that
942 // Note that a high number here doesn't mean that we'll be spawning a
943 // large number of threads in parallel. The backend of rustc contains
944 // global rate limiting through the `jobserver` crate so we'll never
945 // overload the system with too much work, but rather we'll only be
946 // optimizing when we're otherwise cooperating with other instances of
949 // Rather a high number here means that we should be able to keep a lot
950 // of idle cpus busy. By ensuring that no codegen unit takes *too* long
951 // to build we'll be guaranteed that all cpus will finish pretty closely
952 // to one another and we should make relatively optimal use of system
955 // Note that the main cost of codegen units is that it prevents LLVM
956 // from inlining across codegen units. Users in general don't have a lot
957 // of control over how codegen units are split up so it's our job in the
958 // compiler to ensure that undue performance isn't lost when using
959 // codegen units (aka we can't require everyone to slap `#[inline]` on
962 // If we're compiling at `-O0` then the number doesn't really matter too
963 // much because performance doesn't matter and inlining is ok to lose.
964 // In debug mode we just want to try to guarantee that no cpu is stuck
965 // doing work that could otherwise be farmed to others.
967 // In release mode, however (O1 and above) performance does indeed
968 // matter! To recover the loss in performance due to inlining we'll be
969 // enabling ThinLTO by default (the function for which is just below).
970 // This will ensure that we recover any inlining wins we otherwise lost
971 // through codegen unit partitioning.
975 // Ok that's a lot of words but the basic tl;dr; is that we want a high
976 // number here -- but not too high. Additionally we're "safe" to have it
977 // always at the same number at all optimization levels.
979 // As a result 16 was chosen here! Mostly because it was a power of 2
980 // and most benchmarks agreed it was roughly a local optimum. Not very
985 pub fn teach(&self, code
: &DiagnosticId
) -> bool
{
986 self.opts
.debugging_opts
.teach
&& self.diagnostic().must_teach(code
)
989 pub fn rust_2015(&self) -> bool
{
990 self.opts
.edition
== Edition
::Edition2015
993 /// Are we allowed to use features from the Rust 2018 edition?
994 pub fn rust_2018(&self) -> bool
{
995 self.opts
.edition
>= Edition
::Edition2018
998 /// Are we allowed to use features from the Rust 2021 edition?
999 pub fn rust_2021(&self) -> bool
{
1000 self.opts
.edition
>= Edition
::Edition2021
1003 pub fn edition(&self) -> Edition
{
1007 /// Returns `true` if we cannot skip the PLT for shared library calls.
1008 pub fn needs_plt(&self) -> bool
{
1009 // Check if the current target usually needs PLT to be enabled.
1010 // The user can use the command line flag to override it.
1011 let needs_plt
= self.target
.needs_plt
;
1013 let dbg_opts
= &self.opts
.debugging_opts
;
1015 let relro_level
= dbg_opts
.relro_level
.unwrap_or(self.target
.relro_level
);
1017 // Only enable this optimization by default if full relro is also enabled.
1018 // In this case, lazy binding was already unavailable, so nothing is lost.
1019 // This also ensures `-Wl,-z,now` is supported by the linker.
1020 let full_relro
= RelroLevel
::Full
== relro_level
;
1022 // If user didn't explicitly forced us to use / skip the PLT,
1023 // then try to skip it where possible.
1024 dbg_opts
.plt
.unwrap_or(needs_plt
|| !full_relro
)
1027 /// Checks if LLVM lifetime markers should be emitted.
1028 pub fn emit_lifetime_markers(&self) -> bool
{
1029 self.opts
.optimize
!= config
::OptLevel
::No
1030 // AddressSanitizer uses lifetimes to detect use after scope bugs.
1031 // MemorySanitizer uses lifetimes to detect use of uninitialized stack variables.
1032 // HWAddressSanitizer will use lifetimes to detect use after scope bugs in the future.
1033 || self.opts
.debugging_opts
.sanitizer
.intersects(SanitizerSet
::ADDRESS
| SanitizerSet
::MEMORY
| SanitizerSet
::HWADDRESS
)
1036 pub fn link_dead_code(&self) -> bool
{
1037 self.opts
.cg
.link_dead_code
.unwrap_or(false)
1040 pub fn instrument_coverage(&self) -> bool
{
1041 self.opts
.debugging_opts
.instrument_coverage
.unwrap_or(config
::InstrumentCoverage
::Off
)
1042 != config
::InstrumentCoverage
::Off
1045 pub fn instrument_coverage_except_unused_generics(&self) -> bool
{
1046 self.opts
.debugging_opts
.instrument_coverage
.unwrap_or(config
::InstrumentCoverage
::Off
)
1047 == config
::InstrumentCoverage
::ExceptUnusedGenerics
1050 pub fn instrument_coverage_except_unused_functions(&self) -> bool
{
1051 self.opts
.debugging_opts
.instrument_coverage
.unwrap_or(config
::InstrumentCoverage
::Off
)
1052 == config
::InstrumentCoverage
::ExceptUnusedFunctions
1055 pub fn is_proc_macro_attr(&self, attr
: &Attribute
) -> bool
{
1056 [sym
::proc_macro
, sym
::proc_macro_attribute
, sym
::proc_macro_derive
]
1058 .any(|kind
| attr
.has_name(*kind
))
1061 pub fn contains_name(&self, attrs
: &[Attribute
], name
: Symbol
) -> bool
{
1062 attrs
.iter().any(|item
| item
.has_name(name
))
1065 pub fn find_by_name
<'a
>(
1067 attrs
: &'a
[Attribute
],
1069 ) -> Option
<&'a Attribute
> {
1070 attrs
.iter().find(|attr
| attr
.has_name(name
))
1073 pub fn filter_by_name
<'a
>(
1075 attrs
: &'a
[Attribute
],
1077 ) -> impl Iterator
<Item
= &'a Attribute
> {
1078 attrs
.iter().filter(move |attr
| attr
.has_name(name
))
1081 pub fn first_attr_value_str_by_name(
1083 attrs
: &[Attribute
],
1085 ) -> Option
<Symbol
> {
1086 attrs
.iter().find(|at
| at
.has_name(name
)).and_then(|at
| at
.value_str())
1091 sopts
: &config
::Options
,
1092 registry
: rustc_errors
::registry
::Registry
,
1093 source_map
: Lrc
<SourceMap
>,
1094 emitter_dest
: Option
<Box
<dyn Write
+ Send
>>,
1095 ) -> Box
<dyn Emitter
+ sync
::Send
> {
1096 let macro_backtrace
= sopts
.debugging_opts
.macro_backtrace
;
1097 match (sopts
.error_format
, emitter_dest
) {
1098 (config
::ErrorOutputType
::HumanReadable(kind
), dst
) => {
1099 let (short
, color_config
) = kind
.unzip();
1101 if let HumanReadableErrorType
::AnnotateSnippet(_
) = kind
{
1103 AnnotateSnippetEmitterWriter
::new(Some(source_map
), short
, macro_backtrace
);
1104 Box
::new(emitter
.ui_testing(sopts
.debugging_opts
.ui_testing
))
1106 let emitter
= match dst
{
1107 None
=> EmitterWriter
::stderr(
1111 sopts
.debugging_opts
.teach
,
1112 sopts
.debugging_opts
.terminal_width
,
1115 Some(dst
) => EmitterWriter
::new(
1119 false, // no teach messages when writing to a buffer
1120 false, // no colors when writing to a buffer
1121 None
, // no terminal width
1125 Box
::new(emitter
.ui_testing(sopts
.debugging_opts
.ui_testing
))
1128 (config
::ErrorOutputType
::Json { pretty, json_rendered }
, None
) => Box
::new(
1129 JsonEmitter
::stderr(
1134 sopts
.debugging_opts
.terminal_width
,
1137 .ui_testing(sopts
.debugging_opts
.ui_testing
),
1139 (config
::ErrorOutputType
::Json { pretty, json_rendered }
, Some(dst
)) => Box
::new(
1146 sopts
.debugging_opts
.terminal_width
,
1149 .ui_testing(sopts
.debugging_opts
.ui_testing
),
1154 pub enum DiagnosticOutput
{
1156 Raw(Box
<dyn Write
+ Send
>),
1159 pub fn build_session(
1160 sopts
: config
::Options
,
1161 local_crate_source_file
: Option
<PathBuf
>,
1162 registry
: rustc_errors
::registry
::Registry
,
1163 diagnostics_output
: DiagnosticOutput
,
1164 driver_lint_caps
: FxHashMap
<lint
::LintId
, lint
::Level
>,
1165 file_loader
: Option
<Box
<dyn FileLoader
+ Send
+ Sync
+ '
static>>,
1166 target_override
: Option
<Target
>,
1168 // FIXME: This is not general enough to make the warning lint completely override
1169 // normal diagnostic warnings, since the warning lint can also be denied and changed
1170 // later via the source code.
1171 let warnings_allow
= sopts
1174 .filter(|&&(ref key
, _
)| *key
== "warnings")
1175 .map(|&(_
, ref level
)| *level
== lint
::Allow
)
1178 let cap_lints_allow
= sopts
.lint_cap
.map_or(false, |cap
| cap
== lint
::Allow
);
1179 let can_emit_warnings
= !(warnings_allow
|| cap_lints_allow
);
1181 let write_dest
= match diagnostics_output
{
1182 DiagnosticOutput
::Default
=> None
,
1183 DiagnosticOutput
::Raw(write
) => Some(write
),
1186 let sysroot
= match &sopts
.maybe_sysroot
{
1187 Some(sysroot
) => sysroot
.clone(),
1188 None
=> filesearch
::get_or_default_sysroot(),
1191 let target_cfg
= config
::build_target_config(&sopts
, target_override
, &sysroot
);
1192 let host_triple
= TargetTriple
::from_triple(config
::host_triple());
1193 let (host
, target_warnings
) = Target
::search(&host_triple
, &sysroot
).unwrap_or_else(|e
| {
1194 early_error(sopts
.error_format
, &format
!("Error loading host specification: {}", e
))
1196 for warning
in target_warnings
.warning_messages() {
1197 early_warn(sopts
.error_format
, &warning
)
1200 let loader
= file_loader
.unwrap_or_else(|| Box
::new(RealFileLoader
));
1201 let hash_kind
= sopts
.debugging_opts
.src_hash_algorithm
.unwrap_or_else(|| {
1202 if target_cfg
.is_like_msvc
{
1203 SourceFileHashAlgorithm
::Sha1
1205 SourceFileHashAlgorithm
::Md5
1208 let source_map
= Lrc
::new(SourceMap
::with_file_loader_and_hash_kind(
1210 sopts
.file_path_mapping(),
1213 let emitter
= default_emitter(&sopts
, registry
, source_map
.clone(), write_dest
);
1215 let span_diagnostic
= rustc_errors
::Handler
::with_emitter_and_flags(
1217 sopts
.debugging_opts
.diagnostic_handler_flags(can_emit_warnings
),
1220 let self_profiler
= if let SwitchWithOptPath
::Enabled(ref d
) = sopts
.debugging_opts
.self_profile
1223 if let Some(ref directory
) = d { directory }
else { std::path::Path::new(".") }
;
1225 let profiler
= SelfProfiler
::new(
1227 sopts
.crate_name
.as_deref(),
1228 &sopts
.debugging_opts
.self_profile_events
,
1231 Ok(profiler
) => Some(Arc
::new(profiler
)),
1233 early_warn(sopts
.error_format
, &format
!("failed to create profiler: {}", e
));
1241 let mut parse_sess
= ParseSess
::with_span_handler(span_diagnostic
, source_map
);
1242 parse_sess
.assume_incomplete_release
= sopts
.debugging_opts
.assume_incomplete_release
;
1244 let host_triple
= config
::host_triple();
1245 let target_triple
= sopts
.target_triple
.triple();
1246 let host_tlib_path
= Lrc
::new(SearchPath
::from_sysroot_and_triple(&sysroot
, host_triple
));
1247 let target_tlib_path
= if host_triple
== target_triple
{
1248 // Use the same `SearchPath` if host and target triple are identical to avoid unnecessary
1249 // rescanning of the target lib path and an unnecessary allocation.
1250 host_tlib_path
.clone()
1252 Lrc
::new(SearchPath
::from_sysroot_and_triple(&sysroot
, target_triple
))
1255 let file_path_mapping
= sopts
.file_path_mapping();
1257 let local_crate_source_file
=
1258 local_crate_source_file
.map(|path
| file_path_mapping
.map_prefix(path
).0);
1260 let optimization_fuel
= Lock
::new(OptimizationFuel
{
1261 remaining
: sopts
.debugging_opts
.fuel
.as_ref().map_or(0, |i
| i
.1),
1264 let print_fuel
= AtomicU64
::new(0);
1266 let cgu_reuse_tracker
= if sopts
.debugging_opts
.query_dep_graph
{
1267 CguReuseTracker
::new()
1269 CguReuseTracker
::new_disabled()
1272 let prof
= SelfProfilerRef
::new(
1274 sopts
.debugging_opts
.time_passes
|| sopts
.debugging_opts
.time
,
1275 sopts
.debugging_opts
.time_passes
,
1278 let ctfe_backtrace
= Lock
::new(match env
::var("RUSTC_CTFE_BACKTRACE") {
1279 Ok(ref val
) if val
== "immediate" => CtfeBacktrace
::Immediate
,
1280 Ok(ref val
) if val
!= "0" => CtfeBacktrace
::Capture
,
1281 _
=> CtfeBacktrace
::Disabled
,
1285 if target_cfg
.allow_asm { InlineAsmArch::from_str(&target_cfg.arch).ok() }
else { None }
;
1287 let sess
= Session
{
1295 local_crate_source_file
,
1296 one_time_diagnostics
: Default
::default(),
1297 crate_types
: OnceCell
::new(),
1298 stable_crate_id
: OnceCell
::new(),
1299 features
: OnceCell
::new(),
1300 incr_comp_session
: OneThread
::new(RefCell
::new(IncrCompSession
::NotInitialized
)),
1303 perf_stats
: PerfStats
{
1304 symbol_hash_time
: Lock
::new(Duration
::from_secs(0)),
1305 queries_canonicalized
: AtomicUsize
::new(0),
1306 normalize_generic_arg_after_erasing_regions
: AtomicUsize
::new(0),
1307 normalize_projection_ty
: AtomicUsize
::new(0),
1309 code_stats
: Default
::default(),
1312 jobserver
: jobserver
::client(),
1315 miri_unleashed_features
: Lock
::new(Default
::default()),
1317 target_features
: FxHashSet
::default(),
1320 validate_commandline_args_with_session_available(&sess
);
1325 // If it is useful to have a Session available already for validating a
1326 // commandline argument, you can do so here.
1327 fn validate_commandline_args_with_session_available(sess
: &Session
) {
1328 // Since we don't know if code in an rlib will be linked to statically or
1329 // dynamically downstream, rustc generates `__imp_` symbols that help linkers
1330 // on Windows deal with this lack of knowledge (#27438). Unfortunately,
1331 // these manually generated symbols confuse LLD when it tries to merge
1332 // bitcode during ThinLTO. Therefore we disallow dynamic linking on Windows
1333 // when compiling for LLD ThinLTO. This way we can validly just not generate
1334 // the `dllimport` attributes and `__imp_` symbols in that case.
1335 if sess
.opts
.cg
.linker_plugin_lto
.enabled()
1336 && sess
.opts
.cg
.prefer_dynamic
1337 && sess
.target
.is_like_windows
1340 "Linker plugin based LTO is not supported together with \
1341 `-C prefer-dynamic` when targeting Windows-like targets",
1345 // Make sure that any given profiling data actually exists so LLVM can't
1346 // decide to silently skip PGO.
1347 if let Some(ref path
) = sess
.opts
.cg
.profile_use
{
1350 "File `{}` passed to `-C profile-use` does not exist.",
1356 // Do the same for sample profile data.
1357 if let Some(ref path
) = sess
.opts
.debugging_opts
.profile_sample_use
{
1360 "File `{}` passed to `-C profile-sample-use` does not exist.",
1366 // Unwind tables cannot be disabled if the target requires them.
1367 if let Some(include_uwtables
) = sess
.opts
.cg
.force_unwind_tables
{
1368 if sess
.target
.requires_uwtable
&& !include_uwtables
{
1370 "target requires unwind tables, they cannot be disabled with \
1371 `-C force-unwind-tables=no`.",
1376 // Sanitizers can only be used on platforms that we know have working sanitizer codegen.
1377 let supported_sanitizers
= sess
.target
.options
.supported_sanitizers
;
1378 let unsupported_sanitizers
= sess
.opts
.debugging_opts
.sanitizer
- supported_sanitizers
;
1379 match unsupported_sanitizers
.into_iter().count() {
1382 .err(&format
!("{} sanitizer is not supported for this target", unsupported_sanitizers
)),
1383 _
=> sess
.err(&format
!(
1384 "{} sanitizers are not supported for this target",
1385 unsupported_sanitizers
1388 // Cannot mix and match sanitizers.
1389 let mut sanitizer_iter
= sess
.opts
.debugging_opts
.sanitizer
.into_iter();
1390 if let (Some(first
), Some(second
)) = (sanitizer_iter
.next(), sanitizer_iter
.next()) {
1391 sess
.err(&format
!("`-Zsanitizer={}` is incompatible with `-Zsanitizer={}`", first
, second
));
1394 // Cannot enable crt-static with sanitizers on Linux
1395 if sess
.crt_static(None
) && !sess
.opts
.debugging_opts
.sanitizer
.is_empty() {
1397 "sanitizer is incompatible with statically linked libc, \
1398 disable it using `-C target-feature=-crt-static`",
1403 /// Holds data on the current incremental compilation session, if there is one.
1405 pub enum IncrCompSession
{
1406 /// This is the state the session will be in until the incr. comp. dir is
1409 /// This is the state during which the session directory is private and can
1411 Active { session_directory: PathBuf, lock_file: flock::Lock, load_dep_graph: bool }
,
1412 /// This is the state after the session directory has been finalized. In this
1413 /// state, the contents of the directory must not be modified any more.
1414 Finalized { session_directory: PathBuf }
,
1415 /// This is an error state that is reached when some compilation error has
1416 /// occurred. It indicates that the contents of the session directory must
1417 /// not be used, since they might be invalid.
1418 InvalidBecauseOfErrors { session_directory: PathBuf }
,
1421 pub fn early_error_no_abort(output
: config
::ErrorOutputType
, msg
: &str) {
1422 let emitter
: Box
<dyn Emitter
+ sync
::Send
> = match output
{
1423 config
::ErrorOutputType
::HumanReadable(kind
) => {
1424 let (short
, color_config
) = kind
.unzip();
1425 Box
::new(EmitterWriter
::stderr(color_config
, None
, short
, false, None
, false))
1427 config
::ErrorOutputType
::Json { pretty, json_rendered }
=> {
1428 Box
::new(JsonEmitter
::basic(pretty
, json_rendered
, None
, false))
1431 let handler
= rustc_errors
::Handler
::with_emitter(true, None
, emitter
);
1432 handler
.struct_fatal(msg
).emit();
1435 pub fn early_error(output
: config
::ErrorOutputType
, msg
: &str) -> ! {
1436 early_error_no_abort(output
, msg
);
1437 rustc_errors
::FatalError
.raise();
1440 pub fn early_warn(output
: config
::ErrorOutputType
, msg
: &str) {
1441 let emitter
: Box
<dyn Emitter
+ sync
::Send
> = match output
{
1442 config
::ErrorOutputType
::HumanReadable(kind
) => {
1443 let (short
, color_config
) = kind
.unzip();
1444 Box
::new(EmitterWriter
::stderr(color_config
, None
, short
, false, None
, false))
1446 config
::ErrorOutputType
::Json { pretty, json_rendered }
=> {
1447 Box
::new(JsonEmitter
::basic(pretty
, json_rendered
, None
, false))
1450 let handler
= rustc_errors
::Handler
::with_emitter(true, None
, emitter
);
1451 handler
.struct_warn(msg
).emit();