| use crate::cgu_reuse_tracker::CguReuseTracker; |
| use crate::code_stats::CodeStats; |
| pub use crate::code_stats::{DataTypeKind, FieldInfo, SizeKind, VariantInfo}; |
| use crate::config::{self, CrateType, OutputType, PrintRequest, SanitizerSet, SwitchWithOptPath}; |
| use crate::filesearch; |
| use crate::lint; |
| use crate::parse::ParseSess; |
| use crate::search_paths::{PathKind, SearchPath}; |
| |
| pub use rustc_ast::crate_disambiguator::CrateDisambiguator; |
| use rustc_data_structures::flock; |
| use rustc_data_structures::fx::{FxHashMap, FxHashSet}; |
| use rustc_data_structures::jobserver::{self, Client}; |
| use rustc_data_structures::profiling::{duration_to_secs_str, SelfProfiler, SelfProfilerRef}; |
| use rustc_data_structures::sync::{ |
| self, AtomicU64, AtomicUsize, Lock, Lrc, OnceCell, OneThread, Ordering, Ordering::SeqCst, |
| }; |
| use rustc_errors::annotate_snippet_emitter_writer::AnnotateSnippetEmitterWriter; |
| use rustc_errors::emitter::{Emitter, EmitterWriter, HumanReadableErrorType}; |
| use rustc_errors::json::JsonEmitter; |
| use rustc_errors::registry::Registry; |
| use rustc_errors::{Applicability, DiagnosticBuilder, DiagnosticId, ErrorReported}; |
| use rustc_span::edition::Edition; |
| use rustc_span::source_map::{FileLoader, MultiSpan, RealFileLoader, SourceMap, Span}; |
| use rustc_span::{SourceFileHashAlgorithm, Symbol}; |
| use rustc_target::asm::InlineAsmArch; |
| use rustc_target::spec::{CodeModel, PanicStrategy, RelocModel, RelroLevel}; |
| use rustc_target::spec::{Target, TargetTriple, TlsModel}; |
| |
| use std::cell::{self, RefCell}; |
| use std::env; |
| use std::fmt; |
| use std::io::Write; |
| use std::num::NonZeroU32; |
| use std::ops::{Div, Mul}; |
| use std::path::PathBuf; |
| use std::str::FromStr; |
| use std::sync::Arc; |
| use std::time::Duration; |
| |
| pub struct OptimizationFuel { |
| /// If `-zfuel=crate=n` is specified, initially set to `n`, otherwise `0`. |
| remaining: u64, |
| /// We're rejecting all further optimizations. |
| out_of_fuel: bool, |
| } |
| |
| /// The behavior of the CTFE engine when an error occurs with regards to backtraces. |
| #[derive(Clone, Copy)] |
| pub enum CtfeBacktrace { |
| /// Do nothing special, return the error as usual without a backtrace. |
| Disabled, |
| /// Capture a backtrace at the point the error is created and return it in the error |
| /// (to be printed later if/when the error ever actually gets shown to the user). |
| Capture, |
| /// Capture a backtrace at the point the error is created and immediately print it out. |
| Immediate, |
| } |
| |
| /// New-type wrapper around `usize` for representing limits. Ensures that comparisons against |
| /// limits are consistent throughout the compiler. |
| #[derive(Clone, Copy, Debug)] |
| pub struct Limit(pub usize); |
| |
| impl Limit { |
| /// Create a new limit from a `usize`. |
| pub fn new(value: usize) -> Self { |
| Limit(value) |
| } |
| |
| /// Check that `value` is within the limit. Ensures that the same comparisons are used |
| /// throughout the compiler, as mismatches can cause ICEs, see #72540. |
| pub fn value_within_limit(&self, value: usize) -> bool { |
| value <= self.0 |
| } |
| } |
| |
| impl fmt::Display for Limit { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!(f, "{}", self.0) |
| } |
| } |
| |
| impl Div<usize> for Limit { |
| type Output = Limit; |
| |
| fn div(self, rhs: usize) -> Self::Output { |
| Limit::new(self.0 / rhs) |
| } |
| } |
| |
| impl Mul<usize> for Limit { |
| type Output = Limit; |
| |
| fn mul(self, rhs: usize) -> Self::Output { |
| Limit::new(self.0 * rhs) |
| } |
| } |
| |
| /// Represents the data associated with a compilation |
| /// session for a single crate. |
| pub struct Session { |
| pub target: config::Config, |
| pub host: Target, |
| pub opts: config::Options, |
| pub host_tlib_path: SearchPath, |
| /// `None` if the host and target are the same. |
| pub target_tlib_path: Option<SearchPath>, |
| pub parse_sess: ParseSess, |
| pub sysroot: PathBuf, |
| /// The name of the root source file of the crate, in the local file system. |
| /// `None` means that there is no source file. |
| pub local_crate_source_file: Option<PathBuf>, |
| /// The directory the compiler has been executed in plus a flag indicating |
| /// if the value stored here has been affected by path remapping. |
| pub working_dir: (PathBuf, bool), |
| |
| /// Set of `(DiagnosticId, Option<Span>, message)` tuples tracking |
| /// (sub)diagnostics that have been set once, but should not be set again, |
| /// in order to avoid redundantly verbose output (Issue #24690, #44953). |
| pub one_time_diagnostics: Lock<FxHashSet<(DiagnosticMessageId, Option<Span>, String)>>, |
| crate_types: OnceCell<Vec<CrateType>>, |
| /// The `crate_disambiguator` is constructed out of all the `-C metadata` |
| /// arguments passed to the compiler. Its value together with the crate-name |
| /// forms a unique global identifier for the crate. It is used to allow |
| /// multiple crates with the same name to coexist. See the |
| /// `rustc_codegen_llvm::back::symbol_names` module for more information. |
| pub crate_disambiguator: OnceCell<CrateDisambiguator>, |
| |
| features: OnceCell<rustc_feature::Features>, |
| |
| /// The maximum recursion limit for potentially infinitely recursive |
| /// operations such as auto-dereference and monomorphization. |
| pub recursion_limit: OnceCell<Limit>, |
| |
| /// The maximum length of types during monomorphization. |
| pub type_length_limit: OnceCell<Limit>, |
| |
| /// The maximum blocks a const expression can evaluate. |
| pub const_eval_limit: OnceCell<Limit>, |
| |
| incr_comp_session: OneThread<RefCell<IncrCompSession>>, |
| /// Used for incremental compilation tests. Will only be populated if |
| /// `-Zquery-dep-graph` is specified. |
| pub cgu_reuse_tracker: CguReuseTracker, |
| |
| /// Used by `-Z self-profile`. |
| pub prof: SelfProfilerRef, |
| |
| /// Some measurements that are being gathered during compilation. |
| pub perf_stats: PerfStats, |
| |
| /// Data about code being compiled, gathered during compilation. |
| pub code_stats: CodeStats, |
| |
| /// If `-zfuel=crate=n` is specified, `Some(crate)`. |
| optimization_fuel_crate: Option<String>, |
| |
| /// Tracks fuel info if `-zfuel=crate=n` is specified. |
| optimization_fuel: Lock<OptimizationFuel>, |
| |
| // The next two are public because the driver needs to read them. |
| /// If `-zprint-fuel=crate`, `Some(crate)`. |
| pub print_fuel_crate: Option<String>, |
| /// Always set to zero and incremented so that we can print fuel expended by a crate. |
| pub print_fuel: AtomicU64, |
| |
| /// Loaded up early on in the initialization of this `Session` to avoid |
| /// false positives about a job server in our environment. |
| pub jobserver: Client, |
| |
| /// Cap lint level specified by a driver specifically. |
| pub driver_lint_caps: FxHashMap<lint::LintId, lint::Level>, |
| |
| /// `Span`s of trait methods that weren't found to avoid emitting object safety errors |
| pub trait_methods_not_found: Lock<FxHashSet<Span>>, |
| |
| /// Mapping from ident span to path span for paths that don't exist as written, but that |
| /// exist under `std`. For example, wrote `str::from_utf8` instead of `std::str::from_utf8`. |
| pub confused_type_with_std_module: Lock<FxHashMap<Span, Span>>, |
| |
| /// Path for libraries that will take preference over libraries shipped by Rust. |
| /// Used by windows-gnu targets to priortize system mingw-w64 libraries. |
| pub system_library_path: OneThread<RefCell<Option<Option<PathBuf>>>>, |
| |
| /// Tracks the current behavior of the CTFE engine when an error occurs. |
| /// Options range from returning the error without a backtrace to returning an error |
| /// and immediately printing the backtrace to stderr. |
| pub ctfe_backtrace: Lock<CtfeBacktrace>, |
| |
| /// This tracks where `-Zunleash-the-miri-inside-of-you` was used to get around a |
| /// const check, optionally with the relevant feature gate. We use this to |
| /// warn about unleashing, but with a single diagnostic instead of dozens that |
| /// drown everything else in noise. |
| miri_unleashed_features: Lock<Vec<(Span, Option<Symbol>)>>, |
| |
| /// Base directory containing the `src/` for the Rust standard library, and |
| /// potentially `rustc` as well, if we can can find it. Right now it's always |
| /// `$sysroot/lib/rustlib/src/rust` (i.e. the `rustup` `rust-src` component). |
| /// |
| /// This directory is what the virtual `/rustc/$hash` is translated back to, |
| /// if Rust was built with path remapping to `/rustc/$hash` enabled |
| /// (the `rust.remap-debuginfo` option in `config.toml`). |
| pub real_rust_source_base_dir: Option<PathBuf>, |
| |
| /// Architecture to use for interpreting asm!. |
| pub asm_arch: Option<InlineAsmArch>, |
| |
| /// Set of enabled features for the current target. |
| pub target_features: FxHashSet<Symbol>, |
| } |
| |
| pub struct PerfStats { |
| /// The accumulated time spent on computing symbol hashes. |
| pub symbol_hash_time: Lock<Duration>, |
| /// The accumulated time spent decoding def path tables from metadata. |
| pub decode_def_path_tables_time: Lock<Duration>, |
| /// Total number of values canonicalized queries constructed. |
| pub queries_canonicalized: AtomicUsize, |
| /// Number of times this query is invoked. |
| pub normalize_generic_arg_after_erasing_regions: AtomicUsize, |
| /// Number of times this query is invoked. |
| pub normalize_projection_ty: AtomicUsize, |
| } |
| |
| /// Enum to support dispatch of one-time diagnostics (in `Session.diag_once`). |
| enum DiagnosticBuilderMethod { |
| Note, |
| SpanNote, |
| SpanSuggestion(String), // suggestion |
| // Add more variants as needed to support one-time diagnostics. |
| } |
| |
| /// Diagnostic message ID, used by `Session.one_time_diagnostics` to avoid |
| /// emitting the same message more than once. |
| #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)] |
| pub enum DiagnosticMessageId { |
| ErrorId(u16), // EXXXX error code as integer |
| LintId(lint::LintId), |
| StabilityId(Option<NonZeroU32>), // issue number |
| } |
| |
| impl From<&'static lint::Lint> for DiagnosticMessageId { |
| fn from(lint: &'static lint::Lint) -> Self { |
| DiagnosticMessageId::LintId(lint::LintId::of(lint)) |
| } |
| } |
| |
| impl Session { |
| pub fn miri_unleashed_feature(&self, span: Span, feature_gate: Option<Symbol>) { |
| self.miri_unleashed_features.lock().push((span, feature_gate)); |
| } |
| |
| fn check_miri_unleashed_features(&self) { |
| let unleashed_features = self.miri_unleashed_features.lock(); |
| if !unleashed_features.is_empty() { |
| let mut must_err = false; |
| // Create a diagnostic pointing at where things got unleashed. |
| let mut diag = self.struct_warn("skipping const checks"); |
| for &(span, feature_gate) in unleashed_features.iter() { |
| // FIXME: `span_label` doesn't do anything, so we use "help" as a hack. |
| if let Some(feature_gate) = feature_gate { |
| diag.span_help(span, &format!("skipping check for `{}` feature", feature_gate)); |
| // The unleash flag must *not* be used to just "hack around" feature gates. |
| must_err = true; |
| } else { |
| diag.span_help(span, "skipping check that does not even have a feature gate"); |
| } |
| } |
| diag.emit(); |
| // If we should err, make sure we did. |
| if must_err && !self.has_errors() { |
| // We have skipped a feature gate, and not run into other errors... reject. |
| self.err( |
| "`-Zunleash-the-miri-inside-of-you` may not be used to circumvent feature \ |
| gates, except when testing error paths in the CTFE engine", |
| ); |
| } |
| } |
| } |
| |
| /// Invoked all the way at the end to finish off diagnostics printing. |
| pub fn finish_diagnostics(&self, registry: &Registry) { |
| self.check_miri_unleashed_features(); |
| self.diagnostic().print_error_count(registry); |
| } |
| |
| pub fn local_crate_disambiguator(&self) -> CrateDisambiguator { |
| self.crate_disambiguator.get().copied().unwrap() |
| } |
| |
| pub fn crate_types(&self) -> &[CrateType] { |
| self.crate_types.get().unwrap().as_slice() |
| } |
| |
| pub fn init_crate_types(&self, crate_types: Vec<CrateType>) { |
| self.crate_types.set(crate_types).expect("`crate_types` was initialized twice") |
| } |
| |
| pub fn recursion_limit(&self) -> Limit { |
| self.recursion_limit.get().copied().unwrap() |
| } |
| |
| pub fn type_length_limit(&self) -> Limit { |
| self.type_length_limit.get().copied().unwrap() |
| } |
| |
| pub fn const_eval_limit(&self) -> Limit { |
| self.const_eval_limit.get().copied().unwrap() |
| } |
| |
| pub fn struct_span_warn<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> DiagnosticBuilder<'_> { |
| self.diagnostic().struct_span_warn(sp, msg) |
| } |
| pub fn struct_span_warn_with_code<S: Into<MultiSpan>>( |
| &self, |
| sp: S, |
| msg: &str, |
| code: DiagnosticId, |
| ) -> DiagnosticBuilder<'_> { |
| self.diagnostic().struct_span_warn_with_code(sp, msg, code) |
| } |
| pub fn struct_warn(&self, msg: &str) -> DiagnosticBuilder<'_> { |
| self.diagnostic().struct_warn(msg) |
| } |
| pub fn struct_span_err<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> DiagnosticBuilder<'_> { |
| self.diagnostic().struct_span_err(sp, msg) |
| } |
| pub fn struct_span_err_with_code<S: Into<MultiSpan>>( |
| &self, |
| sp: S, |
| msg: &str, |
| code: DiagnosticId, |
| ) -> DiagnosticBuilder<'_> { |
| self.diagnostic().struct_span_err_with_code(sp, msg, code) |
| } |
| // FIXME: This method should be removed (every error should have an associated error code). |
| pub fn struct_err(&self, msg: &str) -> DiagnosticBuilder<'_> { |
| self.diagnostic().struct_err(msg) |
| } |
| pub fn struct_err_with_code(&self, msg: &str, code: DiagnosticId) -> DiagnosticBuilder<'_> { |
| self.diagnostic().struct_err_with_code(msg, code) |
| } |
| pub fn struct_span_fatal<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> DiagnosticBuilder<'_> { |
| self.diagnostic().struct_span_fatal(sp, msg) |
| } |
| pub fn struct_span_fatal_with_code<S: Into<MultiSpan>>( |
| &self, |
| sp: S, |
| msg: &str, |
| code: DiagnosticId, |
| ) -> DiagnosticBuilder<'_> { |
| self.diagnostic().struct_span_fatal_with_code(sp, msg, code) |
| } |
| pub fn struct_fatal(&self, msg: &str) -> DiagnosticBuilder<'_> { |
| self.diagnostic().struct_fatal(msg) |
| } |
| |
| pub fn span_fatal<S: Into<MultiSpan>>(&self, sp: S, msg: &str) -> ! { |
| self.diagnostic().span_fatal(sp, msg).raise() |
| } |
| pub fn span_fatal_with_code<S: Into<MultiSpan>>( |
| &self, |
| sp: S, |
| msg: &str, |
| code: DiagnosticId, |
| ) -> ! { |
| self.diagnostic().span_fatal_with_code(sp, msg, code).raise() |
| } |
| pub fn fatal(&self, msg: &str) -> ! { |
| self.diagnostic().fatal(msg).raise() |
| } |
| pub fn span_err_or_warn<S: Into<MultiSpan>>(&self, is_warning: bool, sp: S, msg: &str) { |
| if is_warning { |
| self.span_warn(sp, msg); |
| } else { |
| self.span_err(sp, msg); |
| } |
| } |
| pub fn span_err<S: Into<MultiSpan>>(&self, sp: S, msg: &str) { |
| self.diagnostic().span_err(sp, msg) |
| } |
| pub fn span_err_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: DiagnosticId) { |
| self.diagnostic().span_err_with_code(sp, &msg, code) |
| } |
| pub fn err(&self, msg: &str) { |
| self.diagnostic().err(msg) |
| } |
| pub fn err_count(&self) -> usize { |
| self.diagnostic().err_count() |
| } |
| pub fn has_errors(&self) -> bool { |
| self.diagnostic().has_errors() |
| } |
| pub fn has_errors_or_delayed_span_bugs(&self) -> bool { |
| self.diagnostic().has_errors_or_delayed_span_bugs() |
| } |
| pub fn abort_if_errors(&self) { |
| self.diagnostic().abort_if_errors(); |
| } |
| pub fn compile_status(&self) -> Result<(), ErrorReported> { |
| if self.has_errors() { |
| self.diagnostic().emit_stashed_diagnostics(); |
| Err(ErrorReported) |
| } else { |
| Ok(()) |
| } |
| } |
| // FIXME(matthewjasper) Remove this method, it should never be needed. |
| pub fn track_errors<F, T>(&self, f: F) -> Result<T, ErrorReported> |
| where |
| F: FnOnce() -> T, |
| { |
| let old_count = self.err_count(); |
| let result = f(); |
| let errors = self.err_count() - old_count; |
| if errors == 0 { Ok(result) } else { Err(ErrorReported) } |
| } |
| pub fn span_warn<S: Into<MultiSpan>>(&self, sp: S, msg: &str) { |
| self.diagnostic().span_warn(sp, msg) |
| } |
| pub fn span_warn_with_code<S: Into<MultiSpan>>(&self, sp: S, msg: &str, code: DiagnosticId) { |
| self.diagnostic().span_warn_with_code(sp, msg, code) |
| } |
| pub fn warn(&self, msg: &str) { |
| self.diagnostic().warn(msg) |
| } |
| pub fn opt_span_warn<S: Into<MultiSpan>>(&self, opt_sp: Option<S>, msg: &str) { |
| match opt_sp { |
| Some(sp) => self.span_warn(sp, msg), |
| None => self.warn(msg), |
| } |
| } |
| /// Delay a span_bug() call until abort_if_errors() |
| pub fn delay_span_bug<S: Into<MultiSpan>>(&self, sp: S, msg: &str) { |
| self.diagnostic().delay_span_bug(sp, msg) |
| } |
| pub fn note_without_error(&self, msg: &str) { |
| self.diagnostic().note_without_error(msg) |
| } |
| pub fn span_note_without_error<S: Into<MultiSpan>>(&self, sp: S, msg: &str) { |
| self.diagnostic().span_note_without_error(sp, msg) |
| } |
| pub fn struct_note_without_error(&self, msg: &str) -> DiagnosticBuilder<'_> { |
| self.diagnostic().struct_note_without_error(msg) |
| } |
| |
| pub fn diagnostic(&self) -> &rustc_errors::Handler { |
| &self.parse_sess.span_diagnostic |
| } |
| |
| /// Analogous to calling methods on the given `DiagnosticBuilder`, but |
| /// deduplicates on lint ID, span (if any), and message for this `Session` |
| fn diag_once<'a, 'b>( |
| &'a self, |
| diag_builder: &'b mut DiagnosticBuilder<'a>, |
| method: DiagnosticBuilderMethod, |
| msg_id: DiagnosticMessageId, |
| message: &str, |
| span_maybe: Option<Span>, |
| ) { |
| let id_span_message = (msg_id, span_maybe, message.to_owned()); |
| let fresh = self.one_time_diagnostics.borrow_mut().insert(id_span_message); |
| if fresh { |
| match method { |
| DiagnosticBuilderMethod::Note => { |
| diag_builder.note(message); |
| } |
| DiagnosticBuilderMethod::SpanNote => { |
| let span = span_maybe.expect("`span_note` needs a span"); |
| diag_builder.span_note(span, message); |
| } |
| DiagnosticBuilderMethod::SpanSuggestion(suggestion) => { |
| let span = span_maybe.expect("`span_suggestion_*` needs a span"); |
| diag_builder.span_suggestion( |
| span, |
| message, |
| suggestion, |
| Applicability::Unspecified, |
| ); |
| } |
| } |
| } |
| } |
| |
| pub fn diag_span_note_once<'a, 'b>( |
| &'a self, |
| diag_builder: &'b mut DiagnosticBuilder<'a>, |
| msg_id: DiagnosticMessageId, |
| span: Span, |
| message: &str, |
| ) { |
| self.diag_once( |
| diag_builder, |
| DiagnosticBuilderMethod::SpanNote, |
| msg_id, |
| message, |
| Some(span), |
| ); |
| } |
| |
| pub fn diag_note_once<'a, 'b>( |
| &'a self, |
| diag_builder: &'b mut DiagnosticBuilder<'a>, |
| msg_id: DiagnosticMessageId, |
| message: &str, |
| ) { |
| self.diag_once(diag_builder, DiagnosticBuilderMethod::Note, msg_id, message, None); |
| } |
| |
| pub fn diag_span_suggestion_once<'a, 'b>( |
| &'a self, |
| diag_builder: &'b mut DiagnosticBuilder<'a>, |
| msg_id: DiagnosticMessageId, |
| span: Span, |
| message: &str, |
| suggestion: String, |
| ) { |
| self.diag_once( |
| diag_builder, |
| DiagnosticBuilderMethod::SpanSuggestion(suggestion), |
| msg_id, |
| message, |
| Some(span), |
| ); |
| } |
| |
| #[inline] |
| pub fn source_map(&self) -> &SourceMap { |
| self.parse_sess.source_map() |
| } |
| pub fn verbose(&self) -> bool { |
| self.opts.debugging_opts.verbose |
| } |
| pub fn time_passes(&self) -> bool { |
| self.opts.debugging_opts.time_passes || self.opts.debugging_opts.time |
| } |
| pub fn instrument_mcount(&self) -> bool { |
| self.opts.debugging_opts.instrument_mcount |
| } |
| pub fn time_llvm_passes(&self) -> bool { |
| self.opts.debugging_opts.time_llvm_passes |
| } |
| pub fn meta_stats(&self) -> bool { |
| self.opts.debugging_opts.meta_stats |
| } |
| pub fn asm_comments(&self) -> bool { |
| self.opts.debugging_opts.asm_comments |
| } |
| pub fn verify_llvm_ir(&self) -> bool { |
| self.opts.debugging_opts.verify_llvm_ir || cfg!(always_verify_llvm_ir) |
| } |
| pub fn borrowck_stats(&self) -> bool { |
| self.opts.debugging_opts.borrowck_stats |
| } |
| pub fn print_llvm_passes(&self) -> bool { |
| self.opts.debugging_opts.print_llvm_passes |
| } |
| pub fn binary_dep_depinfo(&self) -> bool { |
| self.opts.debugging_opts.binary_dep_depinfo |
| } |
| |
| /// Gets the features enabled for the current compilation session. |
| /// DO NOT USE THIS METHOD if there is a TyCtxt available, as it circumvents |
| /// dependency tracking. Use tcx.features() instead. |
| #[inline] |
| pub fn features_untracked(&self) -> &rustc_feature::Features { |
| self.features.get().unwrap() |
| } |
| |
| pub fn init_features(&self, features: rustc_feature::Features) { |
| match self.features.set(features) { |
| Ok(()) => {} |
| Err(_) => panic!("`features` was initialized twice"), |
| } |
| } |
| |
| /// Calculates the flavor of LTO to use for this compilation. |
| pub fn lto(&self) -> config::Lto { |
| // If our target has codegen requirements ignore the command line |
| if self.target.target.options.requires_lto { |
| return config::Lto::Fat; |
| } |
| |
| // If the user specified something, return that. If they only said `-C |
| // lto` and we've for whatever reason forced off ThinLTO via the CLI, |
| // then ensure we can't use a ThinLTO. |
| match self.opts.cg.lto { |
| config::LtoCli::Unspecified => { |
| // The compiler was invoked without the `-Clto` flag. Fall |
| // through to the default handling |
| } |
| config::LtoCli::No => { |
| // The user explicitly opted out of any kind of LTO |
| return config::Lto::No; |
| } |
| config::LtoCli::Yes | config::LtoCli::Fat | config::LtoCli::NoParam => { |
| // All of these mean fat LTO |
| return config::Lto::Fat; |
| } |
| config::LtoCli::Thin => { |
| return if self.opts.cli_forced_thinlto_off { |
| config::Lto::Fat |
| } else { |
| config::Lto::Thin |
| }; |
| } |
| } |
| |
| // Ok at this point the target doesn't require anything and the user |
| // hasn't asked for anything. Our next decision is whether or not |
| // we enable "auto" ThinLTO where we use multiple codegen units and |
| // then do ThinLTO over those codegen units. The logic below will |
| // either return `No` or `ThinLocal`. |
| |
| // If processing command line options determined that we're incompatible |
| // with ThinLTO (e.g., `-C lto --emit llvm-ir`) then return that option. |
| if self.opts.cli_forced_thinlto_off { |
| return config::Lto::No; |
| } |
| |
| // If `-Z thinlto` specified process that, but note that this is mostly |
| // a deprecated option now that `-C lto=thin` exists. |
| if let Some(enabled) = self.opts.debugging_opts.thinlto { |
| if enabled { |
| return config::Lto::ThinLocal; |
| } else { |
| return config::Lto::No; |
| } |
| } |
| |
| // If there's only one codegen unit and LTO isn't enabled then there's |
| // no need for ThinLTO so just return false. |
| if self.codegen_units() == 1 { |
| return config::Lto::No; |
| } |
| |
| // Now we're in "defaults" territory. By default we enable ThinLTO for |
| // optimized compiles (anything greater than O0). |
| match self.opts.optimize { |
| config::OptLevel::No => config::Lto::No, |
| _ => config::Lto::ThinLocal, |
| } |
| } |
| |
| /// Returns the panic strategy for this compile session. If the user explicitly selected one |
| /// using '-C panic', use that, otherwise use the panic strategy defined by the target. |
| pub fn panic_strategy(&self) -> PanicStrategy { |
| self.opts.cg.panic.unwrap_or(self.target.target.options.panic_strategy) |
| } |
| pub fn fewer_names(&self) -> bool { |
| let more_names = self.opts.output_types.contains_key(&OutputType::LlvmAssembly) |
| || self.opts.output_types.contains_key(&OutputType::Bitcode) |
| // AddressSanitizer and MemorySanitizer use alloca name when reporting an issue. |
| || self.opts.debugging_opts.sanitizer.intersects(SanitizerSet::ADDRESS | SanitizerSet::MEMORY); |
| |
| self.opts.debugging_opts.fewer_names || !more_names |
| } |
| |
| pub fn unstable_options(&self) -> bool { |
| self.opts.debugging_opts.unstable_options |
| } |
| pub fn overflow_checks(&self) -> bool { |
| self.opts |
| .cg |
| .overflow_checks |
| .or(self.opts.debugging_opts.force_overflow_checks) |
| .unwrap_or(self.opts.debug_assertions) |
| } |
| |
| /// Check whether this compile session and crate type use static crt. |
| pub fn crt_static(&self, crate_type: Option<CrateType>) -> bool { |
| if !self.target.target.options.crt_static_respected { |
| // If the target does not opt in to crt-static support, use its default. |
| return self.target.target.options.crt_static_default; |
| } |
| |
| let requested_features = self.opts.cg.target_feature.split(','); |
| let found_negative = requested_features.clone().any(|r| r == "-crt-static"); |
| let found_positive = requested_features.clone().any(|r| r == "+crt-static"); |
| |
| if found_positive || found_negative { |
| found_positive |
| } else if crate_type == Some(CrateType::ProcMacro) |
| || crate_type == None && self.opts.crate_types.contains(&CrateType::ProcMacro) |
| { |
| // FIXME: When crate_type is not available, |
| // we use compiler options to determine the crate_type. |
| // We can't check `#![crate_type = "proc-macro"]` here. |
| false |
| } else { |
| self.target.target.options.crt_static_default |
| } |
| } |
| |
| pub fn relocation_model(&self) -> RelocModel { |
| self.opts.cg.relocation_model.unwrap_or(self.target.target.options.relocation_model) |
| } |
| |
| pub fn code_model(&self) -> Option<CodeModel> { |
| self.opts.cg.code_model.or(self.target.target.options.code_model) |
| } |
| |
| pub fn tls_model(&self) -> TlsModel { |
| self.opts.debugging_opts.tls_model.unwrap_or(self.target.target.options.tls_model) |
| } |
| |
| pub fn must_not_eliminate_frame_pointers(&self) -> bool { |
| // "mcount" function relies on stack pointer. |
| // See <https://sourceware.org/binutils/docs/gprof/Implementation.html>. |
| if self.instrument_mcount() { |
| true |
| } else if let Some(x) = self.opts.cg.force_frame_pointers { |
| x |
| } else { |
| !self.target.target.options.eliminate_frame_pointer |
| } |
| } |
| |
| pub fn must_emit_unwind_tables(&self) -> bool { |
| // This is used to control the emission of the `uwtable` attribute on |
| // LLVM functions. |
| // |
| // At the very least, unwind tables are needed when compiling with |
| // `-C panic=unwind`. |
| // |
| // On some targets (including windows), however, exceptions include |
| // other events such as illegal instructions, segfaults, etc. This means |
| // that on Windows we end up still needing unwind tables even if the `-C |
| // panic=abort` flag is passed. |
| // |
| // You can also find more info on why Windows needs unwind tables in: |
| // https://bugzilla.mozilla.org/show_bug.cgi?id=1302078 |
| // |
| // If a target requires unwind tables, then they must be emitted. |
| // Otherwise, we can defer to the `-C force-unwind-tables=<yes/no>` |
| // value, if it is provided, or disable them, if not. |
| if self.panic_strategy() == PanicStrategy::Unwind { |
| true |
| } else if self.target.target.options.requires_uwtable { |
| true |
| } else { |
| self.opts.cg.force_unwind_tables.unwrap_or(false) |
| } |
| } |
| |
| /// Returns the symbol name for the registrar function, |
| /// given the crate `Svh` and the function `DefIndex`. |
| pub fn generate_plugin_registrar_symbol(&self, disambiguator: CrateDisambiguator) -> String { |
| format!("__rustc_plugin_registrar_{}__", disambiguator.to_fingerprint().to_hex()) |
| } |
| |
| pub fn generate_proc_macro_decls_symbol(&self, disambiguator: CrateDisambiguator) -> String { |
| format!("__rustc_proc_macro_decls_{}__", disambiguator.to_fingerprint().to_hex()) |
| } |
| |
| pub fn target_filesearch(&self, kind: PathKind) -> filesearch::FileSearch<'_> { |
| filesearch::FileSearch::new( |
| &self.sysroot, |
| self.opts.target_triple.triple(), |
| &self.opts.search_paths, |
| // `target_tlib_path == None` means it's the same as `host_tlib_path`. |
| self.target_tlib_path.as_ref().unwrap_or(&self.host_tlib_path), |
| kind, |
| ) |
| } |
| pub fn host_filesearch(&self, kind: PathKind) -> filesearch::FileSearch<'_> { |
| filesearch::FileSearch::new( |
| &self.sysroot, |
| config::host_triple(), |
| &self.opts.search_paths, |
| &self.host_tlib_path, |
| kind, |
| ) |
| } |
| |
| pub fn set_incr_session_load_dep_graph(&self, load: bool) { |
| let mut incr_comp_session = self.incr_comp_session.borrow_mut(); |
| |
| if let IncrCompSession::Active { ref mut load_dep_graph, .. } = *incr_comp_session { |
| *load_dep_graph = load; |
| } |
| } |
| |
| pub fn incr_session_load_dep_graph(&self) -> bool { |
| let incr_comp_session = self.incr_comp_session.borrow(); |
| match *incr_comp_session { |
| IncrCompSession::Active { load_dep_graph, .. } => load_dep_graph, |
| _ => false, |
| } |
| } |
| |
| pub fn init_incr_comp_session( |
| &self, |
| session_dir: PathBuf, |
| lock_file: flock::Lock, |
| load_dep_graph: bool, |
| ) { |
| let mut incr_comp_session = self.incr_comp_session.borrow_mut(); |
| |
| if let IncrCompSession::NotInitialized = *incr_comp_session { |
| } else { |
| panic!("Trying to initialize IncrCompSession `{:?}`", *incr_comp_session) |
| } |
| |
| *incr_comp_session = |
| IncrCompSession::Active { session_directory: session_dir, lock_file, load_dep_graph }; |
| } |
| |
| pub fn finalize_incr_comp_session(&self, new_directory_path: PathBuf) { |
| let mut incr_comp_session = self.incr_comp_session.borrow_mut(); |
| |
| if let IncrCompSession::Active { .. } = *incr_comp_session { |
| } else { |
| panic!("trying to finalize `IncrCompSession` `{:?}`", *incr_comp_session); |
| } |
| |
| // Note: this will also drop the lock file, thus unlocking the directory. |
| *incr_comp_session = IncrCompSession::Finalized { session_directory: new_directory_path }; |
| } |
| |
| pub fn mark_incr_comp_session_as_invalid(&self) { |
| let mut incr_comp_session = self.incr_comp_session.borrow_mut(); |
| |
| let session_directory = match *incr_comp_session { |
| IncrCompSession::Active { ref session_directory, .. } => session_directory.clone(), |
| IncrCompSession::InvalidBecauseOfErrors { .. } => return, |
| _ => panic!("trying to invalidate `IncrCompSession` `{:?}`", *incr_comp_session), |
| }; |
| |
| // Note: this will also drop the lock file, thus unlocking the directory. |
| *incr_comp_session = IncrCompSession::InvalidBecauseOfErrors { session_directory }; |
| } |
| |
| pub fn incr_comp_session_dir(&self) -> cell::Ref<'_, PathBuf> { |
| let incr_comp_session = self.incr_comp_session.borrow(); |
| cell::Ref::map(incr_comp_session, |incr_comp_session| match *incr_comp_session { |
| IncrCompSession::NotInitialized => panic!( |
| "trying to get session directory from `IncrCompSession`: {:?}", |
| *incr_comp_session, |
| ), |
| IncrCompSession::Active { ref session_directory, .. } |
| | IncrCompSession::Finalized { ref session_directory } |
| | IncrCompSession::InvalidBecauseOfErrors { ref session_directory } => { |
| session_directory |
| } |
| }) |
| } |
| |
| pub fn incr_comp_session_dir_opt(&self) -> Option<cell::Ref<'_, PathBuf>> { |
| self.opts.incremental.as_ref().map(|_| self.incr_comp_session_dir()) |
| } |
| |
| pub fn print_perf_stats(&self) { |
| println!( |
| "Total time spent computing symbol hashes: {}", |
| duration_to_secs_str(*self.perf_stats.symbol_hash_time.lock()) |
| ); |
| println!( |
| "Total time spent decoding DefPath tables: {}", |
| duration_to_secs_str(*self.perf_stats.decode_def_path_tables_time.lock()) |
| ); |
| println!( |
| "Total queries canonicalized: {}", |
| self.perf_stats.queries_canonicalized.load(Ordering::Relaxed) |
| ); |
| println!( |
| "normalize_generic_arg_after_erasing_regions: {}", |
| self.perf_stats.normalize_generic_arg_after_erasing_regions.load(Ordering::Relaxed) |
| ); |
| println!( |
| "normalize_projection_ty: {}", |
| self.perf_stats.normalize_projection_ty.load(Ordering::Relaxed) |
| ); |
| } |
| |
| /// We want to know if we're allowed to do an optimization for crate foo from -z fuel=foo=n. |
| /// This expends fuel if applicable, and records fuel if applicable. |
| pub fn consider_optimizing<T: Fn() -> String>(&self, crate_name: &str, msg: T) -> bool { |
| let mut ret = true; |
| if let Some(ref c) = self.optimization_fuel_crate { |
| if c == crate_name { |
| assert_eq!(self.threads(), 1); |
| let mut fuel = self.optimization_fuel.lock(); |
| ret = fuel.remaining != 0; |
| if fuel.remaining == 0 && !fuel.out_of_fuel { |
| self.warn(&format!("optimization-fuel-exhausted: {}", msg())); |
| fuel.out_of_fuel = true; |
| } else if fuel.remaining > 0 { |
| fuel.remaining -= 1; |
| } |
| } |
| } |
| if let Some(ref c) = self.print_fuel_crate { |
| if c == crate_name { |
| assert_eq!(self.threads(), 1); |
| self.print_fuel.fetch_add(1, SeqCst); |
| } |
| } |
| ret |
| } |
| |
| /// Returns the number of query threads that should be used for this |
| /// compilation |
| pub fn threads(&self) -> usize { |
| self.opts.debugging_opts.threads |
| } |
| |
| /// Returns the number of codegen units that should be used for this |
| /// compilation |
| pub fn codegen_units(&self) -> usize { |
| if let Some(n) = self.opts.cli_forced_codegen_units { |
| return n; |
| } |
| if let Some(n) = self.target.target.options.default_codegen_units { |
| return n as usize; |
| } |
| |
| // If incremental compilation is turned on, we default to a high number |
| // codegen units in order to reduce the "collateral damage" small |
| // changes cause. |
| if self.opts.incremental.is_some() { |
| return 256; |
| } |
| |
| // Why is 16 codegen units the default all the time? |
| // |
| // The main reason for enabling multiple codegen units by default is to |
| // leverage the ability for the codegen backend to do codegen and |
| // optimization in parallel. This allows us, especially for large crates, to |
| // make good use of all available resources on the machine once we've |
| // hit that stage of compilation. Large crates especially then often |
| // take a long time in codegen/optimization and this helps us amortize that |
| // cost. |
| // |
| // Note that a high number here doesn't mean that we'll be spawning a |
| // large number of threads in parallel. The backend of rustc contains |
| // global rate limiting through the `jobserver` crate so we'll never |
| // overload the system with too much work, but rather we'll only be |
| // optimizing when we're otherwise cooperating with other instances of |
| // rustc. |
| // |
| // Rather a high number here means that we should be able to keep a lot |
| // of idle cpus busy. By ensuring that no codegen unit takes *too* long |
| // to build we'll be guaranteed that all cpus will finish pretty closely |
| // to one another and we should make relatively optimal use of system |
| // resources |
| // |
| // Note that the main cost of codegen units is that it prevents LLVM |
| // from inlining across codegen units. Users in general don't have a lot |
| // of control over how codegen units are split up so it's our job in the |
| // compiler to ensure that undue performance isn't lost when using |
| // codegen units (aka we can't require everyone to slap `#[inline]` on |
| // everything). |
| // |
| // If we're compiling at `-O0` then the number doesn't really matter too |
| // much because performance doesn't matter and inlining is ok to lose. |
| // In debug mode we just want to try to guarantee that no cpu is stuck |
| // doing work that could otherwise be farmed to others. |
| // |
| // In release mode, however (O1 and above) performance does indeed |
| // matter! To recover the loss in performance due to inlining we'll be |
| // enabling ThinLTO by default (the function for which is just below). |
| // This will ensure that we recover any inlining wins we otherwise lost |
| // through codegen unit partitioning. |
| // |
| // --- |
| // |
| // Ok that's a lot of words but the basic tl;dr; is that we want a high |
| // number here -- but not too high. Additionally we're "safe" to have it |
| // always at the same number at all optimization levels. |
| // |
| // As a result 16 was chosen here! Mostly because it was a power of 2 |
| // and most benchmarks agreed it was roughly a local optimum. Not very |
| // scientific. |
| 16 |
| } |
| |
| pub fn teach(&self, code: &DiagnosticId) -> bool { |
| self.opts.debugging_opts.teach && self.diagnostic().must_teach(code) |
| } |
| |
| pub fn rust_2015(&self) -> bool { |
| self.opts.edition == Edition::Edition2015 |
| } |
| |
| /// Are we allowed to use features from the Rust 2018 edition? |
| pub fn rust_2018(&self) -> bool { |
| self.opts.edition >= Edition::Edition2018 |
| } |
| |
| pub fn edition(&self) -> Edition { |
| self.opts.edition |
| } |
| |
| /// Returns `true` if we cannot skip the PLT for shared library calls. |
| pub fn needs_plt(&self) -> bool { |
| // Check if the current target usually needs PLT to be enabled. |
| // The user can use the command line flag to override it. |
| let needs_plt = self.target.target.options.needs_plt; |
| |
| let dbg_opts = &self.opts.debugging_opts; |
| |
| let relro_level = dbg_opts.relro_level.unwrap_or(self.target.target.options.relro_level); |
| |
| // Only enable this optimization by default if full relro is also enabled. |
| // In this case, lazy binding was already unavailable, so nothing is lost. |
| // This also ensures `-Wl,-z,now` is supported by the linker. |
| let full_relro = RelroLevel::Full == relro_level; |
| |
| // If user didn't explicitly forced us to use / skip the PLT, |
| // then try to skip it where possible. |
| dbg_opts.plt.unwrap_or(needs_plt || !full_relro) |
| } |
| |
| /// Checks if LLVM lifetime markers should be emitted. |
| pub fn emit_lifetime_markers(&self) -> bool { |
| self.opts.optimize != config::OptLevel::No |
| // AddressSanitizer uses lifetimes to detect use after scope bugs. |
| // MemorySanitizer uses lifetimes to detect use of uninitialized stack variables. |
| || self.opts.debugging_opts.sanitizer.intersects(SanitizerSet::ADDRESS | SanitizerSet::MEMORY) |
| } |
| } |
| |
| fn default_emitter( |
| sopts: &config::Options, |
| registry: rustc_errors::registry::Registry, |
| source_map: Lrc<SourceMap>, |
| emitter_dest: Option<Box<dyn Write + Send>>, |
| ) -> Box<dyn Emitter + sync::Send> { |
| let macro_backtrace = sopts.debugging_opts.macro_backtrace; |
| match (sopts.error_format, emitter_dest) { |
| (config::ErrorOutputType::HumanReadable(kind), dst) => { |
| let (short, color_config) = kind.unzip(); |
| |
| if let HumanReadableErrorType::AnnotateSnippet(_) = kind { |
| let emitter = |
| AnnotateSnippetEmitterWriter::new(Some(source_map), short, macro_backtrace); |
| Box::new(emitter.ui_testing(sopts.debugging_opts.ui_testing)) |
| } else { |
| let emitter = match dst { |
| None => EmitterWriter::stderr( |
| color_config, |
| Some(source_map), |
| short, |
| sopts.debugging_opts.teach, |
| sopts.debugging_opts.terminal_width, |
| macro_backtrace, |
| ), |
| Some(dst) => EmitterWriter::new( |
| dst, |
| Some(source_map), |
| short, |
| false, // no teach messages when writing to a buffer |
| false, // no colors when writing to a buffer |
| None, // no terminal width |
| macro_backtrace, |
| ), |
| }; |
| Box::new(emitter.ui_testing(sopts.debugging_opts.ui_testing)) |
| } |
| } |
| (config::ErrorOutputType::Json { pretty, json_rendered }, None) => Box::new( |
| JsonEmitter::stderr( |
| Some(registry), |
| source_map, |
| pretty, |
| json_rendered, |
| sopts.debugging_opts.terminal_width, |
| macro_backtrace, |
| ) |
| .ui_testing(sopts.debugging_opts.ui_testing), |
| ), |
| (config::ErrorOutputType::Json { pretty, json_rendered }, Some(dst)) => Box::new( |
| JsonEmitter::new( |
| dst, |
| Some(registry), |
| source_map, |
| pretty, |
| json_rendered, |
| sopts.debugging_opts.terminal_width, |
| macro_backtrace, |
| ) |
| .ui_testing(sopts.debugging_opts.ui_testing), |
| ), |
| } |
| } |
| |
| pub enum DiagnosticOutput { |
| Default, |
| Raw(Box<dyn Write + Send>), |
| } |
| |
| pub fn build_session( |
| sopts: config::Options, |
| local_crate_source_file: Option<PathBuf>, |
| registry: rustc_errors::registry::Registry, |
| diagnostics_output: DiagnosticOutput, |
| driver_lint_caps: FxHashMap<lint::LintId, lint::Level>, |
| file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>, |
| ) -> Session { |
| // FIXME: This is not general enough to make the warning lint completely override |
| // normal diagnostic warnings, since the warning lint can also be denied and changed |
| // later via the source code. |
| let warnings_allow = sopts |
| .lint_opts |
| .iter() |
| .filter(|&&(ref key, _)| *key == "warnings") |
| .map(|&(_, ref level)| *level == lint::Allow) |
| .last() |
| .unwrap_or(false); |
| let cap_lints_allow = sopts.lint_cap.map_or(false, |cap| cap == lint::Allow); |
| let can_emit_warnings = !(warnings_allow || cap_lints_allow); |
| |
| let write_dest = match diagnostics_output { |
| DiagnosticOutput::Default => None, |
| DiagnosticOutput::Raw(write) => Some(write), |
| }; |
| |
| let target_cfg = config::build_target_config(&sopts, sopts.error_format); |
| let host_triple = TargetTriple::from_triple(config::host_triple()); |
| let host = Target::search(&host_triple).unwrap_or_else(|e| { |
| early_error(sopts.error_format, &format!("Error loading host specification: {}", e)) |
| }); |
| |
| let loader = file_loader.unwrap_or(Box::new(RealFileLoader)); |
| let hash_kind = sopts.debugging_opts.src_hash_algorithm.unwrap_or_else(|| { |
| if target_cfg.target.options.is_like_msvc { |
| SourceFileHashAlgorithm::Sha1 |
| } else { |
| SourceFileHashAlgorithm::Md5 |
| } |
| }); |
| let source_map = Lrc::new(SourceMap::with_file_loader_and_hash_kind( |
| loader, |
| sopts.file_path_mapping(), |
| hash_kind, |
| )); |
| let emitter = default_emitter(&sopts, registry, source_map.clone(), write_dest); |
| |
| let span_diagnostic = rustc_errors::Handler::with_emitter_and_flags( |
| emitter, |
| sopts.debugging_opts.diagnostic_handler_flags(can_emit_warnings), |
| ); |
| |
| let self_profiler = if let SwitchWithOptPath::Enabled(ref d) = sopts.debugging_opts.self_profile |
| { |
| let directory = |
| if let Some(ref directory) = d { directory } else { std::path::Path::new(".") }; |
| |
| let profiler = SelfProfiler::new( |
| directory, |
| sopts.crate_name.as_ref().map(|s| &s[..]), |
| &sopts.debugging_opts.self_profile_events, |
| ); |
| match profiler { |
| Ok(profiler) => Some(Arc::new(profiler)), |
| Err(e) => { |
| early_warn(sopts.error_format, &format!("failed to create profiler: {}", e)); |
| None |
| } |
| } |
| } else { |
| None |
| }; |
| |
| let parse_sess = ParseSess::with_span_handler(span_diagnostic, source_map); |
| let sysroot = match &sopts.maybe_sysroot { |
| Some(sysroot) => sysroot.clone(), |
| None => filesearch::get_or_default_sysroot(), |
| }; |
| |
| let host_triple = config::host_triple(); |
| let target_triple = sopts.target_triple.triple(); |
| let host_tlib_path = SearchPath::from_sysroot_and_triple(&sysroot, host_triple); |
| let target_tlib_path = if host_triple == target_triple { |
| None |
| } else { |
| Some(SearchPath::from_sysroot_and_triple(&sysroot, target_triple)) |
| }; |
| |
| let file_path_mapping = sopts.file_path_mapping(); |
| |
| let local_crate_source_file = |
| local_crate_source_file.map(|path| file_path_mapping.map_prefix(path).0); |
| |
| let optimization_fuel_crate = sopts.debugging_opts.fuel.as_ref().map(|i| i.0.clone()); |
| let optimization_fuel = Lock::new(OptimizationFuel { |
| remaining: sopts.debugging_opts.fuel.as_ref().map(|i| i.1).unwrap_or(0), |
| out_of_fuel: false, |
| }); |
| let print_fuel_crate = sopts.debugging_opts.print_fuel.clone(); |
| let print_fuel = AtomicU64::new(0); |
| |
| let working_dir = env::current_dir().unwrap_or_else(|e| { |
| parse_sess.span_diagnostic.fatal(&format!("Current directory is invalid: {}", e)).raise() |
| }); |
| let working_dir = file_path_mapping.map_prefix(working_dir); |
| |
| let cgu_reuse_tracker = if sopts.debugging_opts.query_dep_graph { |
| CguReuseTracker::new() |
| } else { |
| CguReuseTracker::new_disabled() |
| }; |
| |
| let prof = SelfProfilerRef::new( |
| self_profiler, |
| sopts.debugging_opts.time_passes || sopts.debugging_opts.time, |
| sopts.debugging_opts.time_passes, |
| ); |
| |
| let ctfe_backtrace = Lock::new(match env::var("RUSTC_CTFE_BACKTRACE") { |
| Ok(ref val) if val == "immediate" => CtfeBacktrace::Immediate, |
| Ok(ref val) if val != "0" => CtfeBacktrace::Capture, |
| _ => CtfeBacktrace::Disabled, |
| }); |
| |
| // Try to find a directory containing the Rust `src`, for more details see |
| // the doc comment on the `real_rust_source_base_dir` field. |
| let real_rust_source_base_dir = { |
| // This is the location used by the `rust-src` `rustup` component. |
| let mut candidate = sysroot.join("lib/rustlib/src/rust"); |
| if let Ok(metadata) = candidate.symlink_metadata() { |
| // Replace the symlink rustbuild creates, with its destination. |
| // We could try to use `fs::canonicalize` instead, but that might |
| // produce unnecessarily verbose path. |
| if metadata.file_type().is_symlink() { |
| if let Ok(symlink_dest) = std::fs::read_link(&candidate) { |
| candidate = symlink_dest; |
| } |
| } |
| } |
| |
| // Only use this directory if it has a file we can expect to always find. |
| if candidate.join("src/libstd/lib.rs").is_file() { Some(candidate) } else { None } |
| }; |
| |
| let asm_arch = if target_cfg.target.options.allow_asm { |
| InlineAsmArch::from_str(&target_cfg.target.arch).ok() |
| } else { |
| None |
| }; |
| |
| let sess = Session { |
| target: target_cfg, |
| host, |
| opts: sopts, |
| host_tlib_path, |
| target_tlib_path, |
| parse_sess, |
| sysroot, |
| local_crate_source_file, |
| working_dir, |
| one_time_diagnostics: Default::default(), |
| crate_types: OnceCell::new(), |
| crate_disambiguator: OnceCell::new(), |
| features: OnceCell::new(), |
| recursion_limit: OnceCell::new(), |
| type_length_limit: OnceCell::new(), |
| const_eval_limit: OnceCell::new(), |
| incr_comp_session: OneThread::new(RefCell::new(IncrCompSession::NotInitialized)), |
| cgu_reuse_tracker, |
| prof, |
| perf_stats: PerfStats { |
| symbol_hash_time: Lock::new(Duration::from_secs(0)), |
| decode_def_path_tables_time: Lock::new(Duration::from_secs(0)), |
| queries_canonicalized: AtomicUsize::new(0), |
| normalize_generic_arg_after_erasing_regions: AtomicUsize::new(0), |
| normalize_projection_ty: AtomicUsize::new(0), |
| }, |
| code_stats: Default::default(), |
| optimization_fuel_crate, |
| optimization_fuel, |
| print_fuel_crate, |
| print_fuel, |
| jobserver: jobserver::client(), |
| driver_lint_caps, |
| trait_methods_not_found: Lock::new(Default::default()), |
| confused_type_with_std_module: Lock::new(Default::default()), |
| system_library_path: OneThread::new(RefCell::new(Default::default())), |
| ctfe_backtrace, |
| miri_unleashed_features: Lock::new(Default::default()), |
| real_rust_source_base_dir, |
| asm_arch, |
| target_features: FxHashSet::default(), |
| }; |
| |
| validate_commandline_args_with_session_available(&sess); |
| |
| sess |
| } |
| |
| // If it is useful to have a Session available already for validating a |
| // commandline argument, you can do so here. |
| fn validate_commandline_args_with_session_available(sess: &Session) { |
| // Since we don't know if code in an rlib will be linked to statically or |
| // dynamically downstream, rustc generates `__imp_` symbols that help the |
| // MSVC linker deal with this lack of knowledge (#27438). Unfortunately, |
| // these manually generated symbols confuse LLD when it tries to merge |
| // bitcode during ThinLTO. Therefore we disallow dynamic linking on MSVC |
| // when compiling for LLD ThinLTO. This way we can validly just not generate |
| // the `dllimport` attributes and `__imp_` symbols in that case. |
| if sess.opts.cg.linker_plugin_lto.enabled() |
| && sess.opts.cg.prefer_dynamic |
| && sess.target.target.options.is_like_msvc |
| { |
| sess.err( |
| "Linker plugin based LTO is not supported together with \ |
| `-C prefer-dynamic` when targeting MSVC", |
| ); |
| } |
| |
| // Make sure that any given profiling data actually exists so LLVM can't |
| // decide to silently skip PGO. |
| if let Some(ref path) = sess.opts.cg.profile_use { |
| if !path.exists() { |
| sess.err(&format!( |
| "File `{}` passed to `-C profile-use` does not exist.", |
| path.display() |
| )); |
| } |
| } |
| |
| // Unwind tables cannot be disabled if the target requires them. |
| if let Some(include_uwtables) = sess.opts.cg.force_unwind_tables { |
| if sess.panic_strategy() == PanicStrategy::Unwind && !include_uwtables { |
| sess.err( |
| "panic=unwind requires unwind tables, they cannot be disabled \ |
| with `-C force-unwind-tables=no`.", |
| ); |
| } |
| |
| if sess.target.target.options.requires_uwtable && !include_uwtables { |
| sess.err( |
| "target requires unwind tables, they cannot be disabled with \ |
| `-C force-unwind-tables=no`.", |
| ); |
| } |
| } |
| |
| // PGO does not work reliably with panic=unwind on Windows. Let's make it |
| // an error to combine the two for now. It always runs into an assertions |
| // if LLVM is built with assertions, but without assertions it sometimes |
| // does not crash and will probably generate a corrupted binary. |
| // We should only display this error if we're actually going to run PGO. |
| // If we're just supposed to print out some data, don't show the error (#61002). |
| if sess.opts.cg.profile_generate.enabled() |
| && sess.target.target.options.is_like_msvc |
| && sess.panic_strategy() == PanicStrategy::Unwind |
| && sess.opts.prints.iter().all(|&p| p == PrintRequest::NativeStaticLibs) |
| { |
| sess.err( |
| "Profile-guided optimization does not yet work in conjunction \ |
| with `-Cpanic=unwind` on Windows when targeting MSVC. \ |
| See issue #61002 <https://github.com/rust-lang/rust/issues/61002> \ |
| for more information.", |
| ); |
| } |
| |
| const ASAN_SUPPORTED_TARGETS: &[&str] = &[ |
| "aarch64-fuchsia", |
| "aarch64-unknown-linux-gnu", |
| "x86_64-apple-darwin", |
| "x86_64-fuchsia", |
| "x86_64-unknown-linux-gnu", |
| ]; |
| const LSAN_SUPPORTED_TARGETS: &[&str] = |
| &["aarch64-unknown-linux-gnu", "x86_64-apple-darwin", "x86_64-unknown-linux-gnu"]; |
| const MSAN_SUPPORTED_TARGETS: &[&str] = |
| &["aarch64-unknown-linux-gnu", "x86_64-unknown-linux-gnu"]; |
| const TSAN_SUPPORTED_TARGETS: &[&str] = |
| &["aarch64-unknown-linux-gnu", "x86_64-apple-darwin", "x86_64-unknown-linux-gnu"]; |
| |
| // Sanitizers can only be used on some tested platforms. |
| for s in sess.opts.debugging_opts.sanitizer { |
| let supported_targets = match s { |
| SanitizerSet::ADDRESS => ASAN_SUPPORTED_TARGETS, |
| SanitizerSet::LEAK => LSAN_SUPPORTED_TARGETS, |
| SanitizerSet::MEMORY => MSAN_SUPPORTED_TARGETS, |
| SanitizerSet::THREAD => TSAN_SUPPORTED_TARGETS, |
| _ => panic!("unrecognized sanitizer {}", s), |
| }; |
| if !supported_targets.contains(&&*sess.opts.target_triple.triple()) { |
| sess.err(&format!( |
| "`-Zsanitizer={}` only works with targets: {}", |
| s, |
| supported_targets.join(", ") |
| )); |
| } |
| let conflicting = sess.opts.debugging_opts.sanitizer - s; |
| if !conflicting.is_empty() { |
| sess.err(&format!( |
| "`-Zsanitizer={}` is incompatible with `-Zsanitizer={}`", |
| s, conflicting, |
| )); |
| // Don't report additional errors. |
| break; |
| } |
| } |
| } |
| |
| /// Holds data on the current incremental compilation session, if there is one. |
| #[derive(Debug)] |
| pub enum IncrCompSession { |
| /// This is the state the session will be in until the incr. comp. dir is |
| /// needed. |
| NotInitialized, |
| /// This is the state during which the session directory is private and can |
| /// be modified. |
| Active { session_directory: PathBuf, lock_file: flock::Lock, load_dep_graph: bool }, |
| /// This is the state after the session directory has been finalized. In this |
| /// state, the contents of the directory must not be modified any more. |
| Finalized { session_directory: PathBuf }, |
| /// This is an error state that is reached when some compilation error has |
| /// occurred. It indicates that the contents of the session directory must |
| /// not be used, since they might be invalid. |
| InvalidBecauseOfErrors { session_directory: PathBuf }, |
| } |
| |
| pub fn early_error(output: config::ErrorOutputType, msg: &str) -> ! { |
| let emitter: Box<dyn Emitter + sync::Send> = match output { |
| config::ErrorOutputType::HumanReadable(kind) => { |
| let (short, color_config) = kind.unzip(); |
| Box::new(EmitterWriter::stderr(color_config, None, short, false, None, false)) |
| } |
| config::ErrorOutputType::Json { pretty, json_rendered } => { |
| Box::new(JsonEmitter::basic(pretty, json_rendered, None, false)) |
| } |
| }; |
| let handler = rustc_errors::Handler::with_emitter(true, None, emitter); |
| handler.struct_fatal(msg).emit(); |
| rustc_errors::FatalError.raise(); |
| } |
| |
| pub fn early_warn(output: config::ErrorOutputType, msg: &str) { |
| let emitter: Box<dyn Emitter + sync::Send> = match output { |
| config::ErrorOutputType::HumanReadable(kind) => { |
| let (short, color_config) = kind.unzip(); |
| Box::new(EmitterWriter::stderr(color_config, None, short, false, None, false)) |
| } |
| config::ErrorOutputType::Json { pretty, json_rendered } => { |
| Box::new(JsonEmitter::basic(pretty, json_rendered, None, false)) |
| } |
| }; |
| let handler = rustc_errors::Handler::with_emitter(true, None, emitter); |
| handler.struct_warn(msg).emit(); |
| } |
| |
| pub type CompileResult = Result<(), ErrorReported>; |
