| use std::any::Any; |
| use std::ops::{Div, Mul}; |
| use std::path::{Path, PathBuf}; |
| use std::str::FromStr; |
| use std::sync::Arc; |
| use std::sync::atomic::AtomicBool; |
| use std::sync::atomic::Ordering::SeqCst; |
| use std::{env, fmt, io}; |
| |
| use rustc_data_structures::flock; |
| use rustc_data_structures::fx::{FxHashMap, FxIndexSet}; |
| use rustc_data_structures::jobserver::{self, Client}; |
| use rustc_data_structures::profiling::{SelfProfiler, SelfProfilerRef}; |
| use rustc_data_structures::sync::{ |
| AtomicU64, DynSend, DynSync, Lock, Lrc, MappedReadGuard, ReadGuard, RwLock, |
| }; |
| use rustc_errors::annotate_snippet_emitter_writer::AnnotateSnippetEmitter; |
| use rustc_errors::codes::*; |
| use rustc_errors::emitter::{DynEmitter, HumanEmitter, HumanReadableErrorType, stderr_destination}; |
| use rustc_errors::json::JsonEmitter; |
| use rustc_errors::registry::Registry; |
| use rustc_errors::{ |
| Diag, DiagCtxt, DiagCtxtHandle, DiagMessage, Diagnostic, ErrorGuaranteed, FatalAbort, |
| FluentBundle, LazyFallbackBundle, TerminalUrl, fallback_fluent_bundle, |
| }; |
| use rustc_macros::HashStable_Generic; |
| pub use rustc_span::def_id::StableCrateId; |
| use rustc_span::edition::Edition; |
| use rustc_span::source_map::{FilePathMapping, SourceMap}; |
| use rustc_span::{FileNameDisplayPreference, RealFileName, Span, Symbol}; |
| use rustc_target::asm::InlineAsmArch; |
| use rustc_target::spec::{ |
| CodeModel, DebuginfoKind, PanicStrategy, RelocModel, RelroLevel, SanitizerSet, |
| SmallDataThresholdSupport, SplitDebuginfo, StackProtector, SymbolVisibility, Target, |
| TargetTriple, TlsModel, |
| }; |
| |
| use crate::code_stats::CodeStats; |
| pub use crate::code_stats::{DataTypeKind, FieldInfo, FieldKind, SizeKind, VariantInfo}; |
| use crate::config::{ |
| self, CoverageLevel, CrateType, DebugInfo, ErrorOutputType, FunctionReturn, Input, |
| InstrumentCoverage, OptLevel, OutFileName, OutputType, RemapPathScopeComponents, |
| SwitchWithOptPath, |
| }; |
| use crate::parse::{ParseSess, add_feature_diagnostics}; |
| use crate::search_paths::{PathKind, SearchPath}; |
| use crate::{errors, filesearch, lint}; |
| |
| 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, HashStable_Generic)] |
| 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. |
| #[inline] |
| pub fn value_within_limit(&self, value: usize) -> bool { |
| value <= self.0 |
| } |
| } |
| |
| impl From<usize> for Limit { |
| fn from(value: usize) -> Self { |
| Self::new(value) |
| } |
| } |
| |
| impl fmt::Display for Limit { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| self.0.fmt(f) |
| } |
| } |
| |
| 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) |
| } |
| } |
| |
| impl rustc_errors::IntoDiagArg for Limit { |
| fn into_diag_arg(self) -> rustc_errors::DiagArgValue { |
| self.to_string().into_diag_arg() |
| } |
| } |
| |
| #[derive(Clone, Copy, Debug, HashStable_Generic)] |
| pub struct Limits { |
| /// The maximum recursion limit for potentially infinitely recursive |
| /// operations such as auto-dereference and monomorphization. |
| pub recursion_limit: Limit, |
| /// The size at which the `large_assignments` lint starts |
| /// being emitted. |
| pub move_size_limit: Limit, |
| /// The maximum length of types during monomorphization. |
| pub type_length_limit: Limit, |
| } |
| |
| pub struct CompilerIO { |
| pub input: Input, |
| pub output_dir: Option<PathBuf>, |
| pub output_file: Option<OutFileName>, |
| pub temps_dir: Option<PathBuf>, |
| } |
| |
| pub trait LintStoreMarker: Any + DynSync + DynSend {} |
| |
| /// Represents the data associated with a compilation |
| /// session for a single crate. |
| pub struct Session { |
| pub target: Target, |
| pub host: Target, |
| pub opts: config::Options, |
| pub host_tlib_path: Lrc<SearchPath>, |
| pub target_tlib_path: Lrc<SearchPath>, |
| pub psess: ParseSess, |
| pub sysroot: PathBuf, |
| /// Input, input file path and output file path to this compilation process. |
| pub io: CompilerIO, |
| |
| incr_comp_session: RwLock<IncrCompSession>, |
| |
| /// Used by `-Z self-profile`. |
| pub prof: SelfProfilerRef, |
| |
| /// Data about code being compiled, gathered during compilation. |
| pub code_stats: CodeStats, |
| |
| /// Tracks fuel info if `-zfuel=crate=n` is specified. |
| optimization_fuel: Lock<OptimizationFuel>, |
| |
| /// 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, |
| |
| /// This only ever stores a `LintStore` but we don't want a dependency on that type here. |
| pub lint_store: Option<Lrc<dyn LintStoreMarker>>, |
| |
| /// Should be set if any lints are registered in `lint_store`. |
| pub registered_lints: bool, |
| |
| /// Cap lint level specified by a driver specifically. |
| pub driver_lint_caps: FxHashMap<lint::LintId, lint::Level>, |
| |
| /// 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. |
| /// The `Lock` is only used by miri to allow setting `ctfe_backtrace` after analysis when |
| /// `MIRI_BACKTRACE` is set. This makes it only apply to miri's errors and not to all CTFE |
| /// errors. |
| 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>)>>, |
| |
| /// Architecture to use for interpreting asm!. |
| pub asm_arch: Option<InlineAsmArch>, |
| |
| /// Set of enabled features for the current target. |
| pub target_features: FxIndexSet<Symbol>, |
| |
| /// Set of enabled features for the current target, including unstable ones. |
| pub unstable_target_features: FxIndexSet<Symbol>, |
| |
| /// The version of the rustc process, possibly including a commit hash and description. |
| pub cfg_version: &'static str, |
| |
| /// The inner atomic value is set to true when a feature marked as `internal` is |
| /// enabled. Makes it so that "please report a bug" is hidden, as ICEs with |
| /// internal features are wontfix, and they are usually the cause of the ICEs. |
| /// None signifies that this is not tracked. |
| pub using_internal_features: Arc<AtomicBool>, |
| |
| /// All commandline args used to invoke the compiler, with @file args fully expanded. |
| /// This will only be used within debug info, e.g. in the pdb file on windows |
| /// This is mainly useful for other tools that reads that debuginfo to figure out |
| /// how to call the compiler with the same arguments. |
| pub expanded_args: Vec<String>, |
| } |
| |
| #[derive(PartialEq, Eq, PartialOrd, Ord)] |
| pub enum MetadataKind { |
| None, |
| Uncompressed, |
| Compressed, |
| } |
| |
| #[derive(Clone, Copy)] |
| pub enum CodegenUnits { |
| /// Specified by the user. In this case we try fairly hard to produce the |
| /// number of CGUs requested. |
| User(usize), |
| |
| /// A default value, i.e. not specified by the user. In this case we take |
| /// more liberties about CGU formation, e.g. avoid producing very small |
| /// CGUs. |
| Default(usize), |
| } |
| |
| impl CodegenUnits { |
| pub fn as_usize(self) -> usize { |
| match self { |
| CodegenUnits::User(n) => n, |
| CodegenUnits::Default(n) => n, |
| } |
| } |
| } |
| |
| impl Session { |
| pub fn miri_unleashed_feature(&self, span: Span, feature_gate: Option<Symbol>) { |
| self.miri_unleashed_features.lock().push((span, feature_gate)); |
| } |
| |
| pub fn local_crate_source_file(&self) -> Option<RealFileName> { |
| Some(self.source_map().path_mapping().to_real_filename(self.io.input.opt_path()?)) |
| } |
| |
| fn check_miri_unleashed_features(&self) -> Option<ErrorGuaranteed> { |
| let mut guar = None; |
| 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. |
| self.dcx().emit_warn(errors::SkippingConstChecks { |
| unleashed_features: unleashed_features |
| .iter() |
| .map(|(span, gate)| { |
| gate.map(|gate| { |
| must_err = true; |
| errors::UnleashedFeatureHelp::Named { span: *span, gate } |
| }) |
| .unwrap_or(errors::UnleashedFeatureHelp::Unnamed { span: *span }) |
| }) |
| .collect(), |
| }); |
| |
| // If we should err, make sure we did. |
| if must_err && self.dcx().has_errors().is_none() { |
| // We have skipped a feature gate, and not run into other errors... reject. |
| guar = Some(self.dcx().emit_err(errors::NotCircumventFeature)); |
| } |
| } |
| guar |
| } |
| |
| /// Invoked all the way at the end to finish off diagnostics printing. |
| pub fn finish_diagnostics(&self, registry: &Registry) -> Option<ErrorGuaranteed> { |
| let mut guar = None; |
| guar = guar.or(self.check_miri_unleashed_features()); |
| guar = guar.or(self.dcx().emit_stashed_diagnostics()); |
| self.dcx().print_error_count(registry); |
| if self.opts.json_future_incompat { |
| self.dcx().emit_future_breakage_report(); |
| } |
| guar |
| } |
| |
| /// Returns true if the crate is a testing one. |
| pub fn is_test_crate(&self) -> bool { |
| self.opts.test |
| } |
| |
| #[track_caller] |
| pub fn create_feature_err<'a>(&'a self, err: impl Diagnostic<'a>, feature: Symbol) -> Diag<'a> { |
| let mut err = self.dcx().create_err(err); |
| if err.code.is_none() { |
| #[allow(rustc::diagnostic_outside_of_impl)] |
| err.code(E0658); |
| } |
| add_feature_diagnostics(&mut err, self, feature); |
| err |
| } |
| |
| /// Record the fact that we called `trimmed_def_paths`, and do some |
| /// checking about whether its cost was justified. |
| pub fn record_trimmed_def_paths(&self) { |
| if self.opts.unstable_opts.print_type_sizes |
| || self.opts.unstable_opts.query_dep_graph |
| || self.opts.unstable_opts.dump_mir.is_some() |
| || self.opts.unstable_opts.unpretty.is_some() |
| || self.opts.output_types.contains_key(&OutputType::Mir) |
| || std::env::var_os("RUSTC_LOG").is_some() |
| { |
| return; |
| } |
| |
| self.dcx().set_must_produce_diag() |
| } |
| |
| #[inline] |
| pub fn dcx(&self) -> DiagCtxtHandle<'_> { |
| self.psess.dcx() |
| } |
| |
| #[inline] |
| pub fn source_map(&self) -> &SourceMap { |
| self.psess.source_map() |
| } |
| |
| /// Returns `true` if internal lints should be added to the lint store - i.e. if |
| /// `-Zunstable-options` is provided and this isn't rustdoc (internal lints can trigger errors |
| /// to be emitted under rustdoc). |
| pub fn enable_internal_lints(&self) -> bool { |
| self.unstable_options() && !self.opts.actually_rustdoc |
| } |
| |
| pub fn instrument_coverage(&self) -> bool { |
| self.opts.cg.instrument_coverage() != InstrumentCoverage::No |
| } |
| |
| pub fn instrument_coverage_branch(&self) -> bool { |
| self.instrument_coverage() |
| && self.opts.unstable_opts.coverage_options.level >= CoverageLevel::Branch |
| } |
| |
| pub fn instrument_coverage_condition(&self) -> bool { |
| self.instrument_coverage() |
| && self.opts.unstable_opts.coverage_options.level >= CoverageLevel::Condition |
| } |
| |
| pub fn instrument_coverage_mcdc(&self) -> bool { |
| self.instrument_coverage() |
| && self.opts.unstable_opts.coverage_options.level >= CoverageLevel::Mcdc |
| } |
| |
| /// True if `-Zcoverage-options=no-mir-spans` was passed. |
| pub fn coverage_no_mir_spans(&self) -> bool { |
| self.opts.unstable_opts.coverage_options.no_mir_spans |
| } |
| |
| pub fn is_sanitizer_cfi_enabled(&self) -> bool { |
| self.opts.unstable_opts.sanitizer.contains(SanitizerSet::CFI) |
| } |
| |
| pub fn is_sanitizer_cfi_canonical_jump_tables_disabled(&self) -> bool { |
| self.opts.unstable_opts.sanitizer_cfi_canonical_jump_tables == Some(false) |
| } |
| |
| pub fn is_sanitizer_cfi_canonical_jump_tables_enabled(&self) -> bool { |
| self.opts.unstable_opts.sanitizer_cfi_canonical_jump_tables == Some(true) |
| } |
| |
| pub fn is_sanitizer_cfi_generalize_pointers_enabled(&self) -> bool { |
| self.opts.unstable_opts.sanitizer_cfi_generalize_pointers == Some(true) |
| } |
| |
| pub fn is_sanitizer_cfi_normalize_integers_enabled(&self) -> bool { |
| self.opts.unstable_opts.sanitizer_cfi_normalize_integers == Some(true) |
| } |
| |
| pub fn is_sanitizer_kcfi_enabled(&self) -> bool { |
| self.opts.unstable_opts.sanitizer.contains(SanitizerSet::KCFI) |
| } |
| |
| pub fn is_split_lto_unit_enabled(&self) -> bool { |
| self.opts.unstable_opts.split_lto_unit == Some(true) |
| } |
| |
| /// Check whether this compile session and crate type use static crt. |
| pub fn crt_static(&self, crate_type: Option<CrateType>) -> bool { |
| if !self.target.crt_static_respected { |
| // If the target does not opt in to crt-static support, use its default. |
| return self.target.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"); |
| |
| // JUSTIFICATION: necessary use of crate_types directly (see FIXME below) |
| #[allow(rustc::bad_opt_access)] |
| 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.crt_static_default |
| } |
| } |
| |
| pub fn is_wasi_reactor(&self) -> bool { |
| self.target.options.os == "wasi" |
| && matches!( |
| self.opts.unstable_opts.wasi_exec_model, |
| Some(config::WasiExecModel::Reactor) |
| ) |
| } |
| |
| /// Returns `true` if the target can use the current split debuginfo configuration. |
| pub fn target_can_use_split_dwarf(&self) -> bool { |
| self.target.debuginfo_kind == DebuginfoKind::Dwarf |
| } |
| |
| pub fn generate_proc_macro_decls_symbol(&self, stable_crate_id: StableCrateId) -> String { |
| format!("__rustc_proc_macro_decls_{:08x}__", stable_crate_id.as_u64()) |
| } |
| |
| pub fn target_filesearch(&self, kind: PathKind) -> filesearch::FileSearch<'_> { |
| filesearch::FileSearch::new(&self.opts.search_paths, &self.target_tlib_path, kind) |
| } |
| pub fn host_filesearch(&self, kind: PathKind) -> filesearch::FileSearch<'_> { |
| filesearch::FileSearch::new(&self.opts.search_paths, &self.host_tlib_path, kind) |
| } |
| |
| /// Returns a list of directories where target-specific tool binaries are located. Some fallback |
| /// directories are also returned, for example if `--sysroot` is used but tools are missing |
| /// (#125246): we also add the bin directories to the sysroot where rustc is located. |
| pub fn get_tools_search_paths(&self, self_contained: bool) -> Vec<PathBuf> { |
| let bin_path = filesearch::make_target_bin_path(&self.sysroot, config::host_triple()); |
| let fallback_sysroot_paths = filesearch::sysroot_candidates() |
| .into_iter() |
| // Ignore sysroot candidate if it was the same as the sysroot path we just used. |
| .filter(|sysroot| *sysroot != self.sysroot) |
| .map(|sysroot| filesearch::make_target_bin_path(&sysroot, config::host_triple())); |
| let search_paths = std::iter::once(bin_path).chain(fallback_sysroot_paths); |
| |
| if self_contained { |
| // The self-contained tools are expected to be e.g. in `bin/self-contained` in the |
| // sysroot's `rustlib` path, so we add such a subfolder to the bin path, and the |
| // fallback paths. |
| search_paths.flat_map(|path| [path.clone(), path.join("self-contained")]).collect() |
| } else { |
| search_paths.collect() |
| } |
| } |
| |
| pub fn init_incr_comp_session(&self, session_dir: PathBuf, lock_file: flock::Lock) { |
| 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: lock_file }; |
| } |
| |
| 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) -> MappedReadGuard<'_, PathBuf> { |
| let incr_comp_session = self.incr_comp_session.borrow(); |
| ReadGuard::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<MappedReadGuard<'_, PathBuf>> { |
| self.opts.incremental.as_ref().map(|_| self.incr_comp_session_dir()) |
| } |
| |
| /// 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( |
| &self, |
| get_crate_name: impl Fn() -> Symbol, |
| msg: impl Fn() -> String, |
| ) -> bool { |
| let mut ret = true; |
| if let Some((ref c, _)) = self.opts.unstable_opts.fuel { |
| if c == get_crate_name().as_str() { |
| assert_eq!(self.threads(), 1); |
| let mut fuel = self.optimization_fuel.lock(); |
| ret = fuel.remaining != 0; |
| if fuel.remaining == 0 && !fuel.out_of_fuel { |
| if self.dcx().can_emit_warnings() { |
| // We only call `msg` in case we can actually emit warnings. |
| // Otherwise, this could cause a `must_produce_diag` ICE |
| // (issue #79546). |
| self.dcx().emit_warn(errors::OptimisationFuelExhausted { msg: msg() }); |
| } |
| fuel.out_of_fuel = true; |
| } else if fuel.remaining > 0 { |
| fuel.remaining -= 1; |
| } |
| } |
| } |
| if let Some(ref c) = self.opts.unstable_opts.print_fuel { |
| if c == get_crate_name().as_str() { |
| assert_eq!(self.threads(), 1); |
| self.print_fuel.fetch_add(1, SeqCst); |
| } |
| } |
| ret |
| } |
| |
| /// Is this edition 2015? |
| pub fn is_rust_2015(&self) -> bool { |
| self.edition().is_rust_2015() |
| } |
| |
| /// Are we allowed to use features from the Rust 2018 edition? |
| pub fn at_least_rust_2018(&self) -> bool { |
| self.edition().at_least_rust_2018() |
| } |
| |
| /// Are we allowed to use features from the Rust 2021 edition? |
| pub fn at_least_rust_2021(&self) -> bool { |
| self.edition().at_least_rust_2021() |
| } |
| |
| /// Are we allowed to use features from the Rust 2024 edition? |
| pub fn at_least_rust_2024(&self) -> bool { |
| self.edition().at_least_rust_2024() |
| } |
| |
| /// Returns `true` if we should use the PLT for shared library calls. |
| pub fn needs_plt(&self) -> bool { |
| // Check if the current target usually wants PLT to be enabled. |
| // The user can use the command line flag to override it. |
| let want_plt = self.target.plt_by_default; |
| |
| let dbg_opts = &self.opts.unstable_opts; |
| |
| let relro_level = self.opts.cg.relro_level.unwrap_or(self.target.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 use it unless the target doesn't want it by default or the full relro forces it on. |
| dbg_opts.plt.unwrap_or(want_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 and KernelAddressSanitizer uses lifetimes to detect use after scope bugs. |
| // MemorySanitizer uses lifetimes to detect use of uninitialized stack variables. |
| // HWAddressSanitizer will use lifetimes to detect use after scope bugs in the future. |
| || self.opts.unstable_opts.sanitizer.intersects(SanitizerSet::ADDRESS | SanitizerSet::KERNELADDRESS | SanitizerSet::MEMORY | SanitizerSet::HWADDRESS) |
| } |
| |
| pub fn diagnostic_width(&self) -> usize { |
| let default_column_width = 140; |
| if let Some(width) = self.opts.diagnostic_width { |
| width |
| } else if self.opts.unstable_opts.ui_testing { |
| default_column_width |
| } else { |
| termize::dimensions().map_or(default_column_width, |(w, _)| w) |
| } |
| } |
| |
| /// Returns the default symbol visibility. |
| pub fn default_visibility(&self) -> SymbolVisibility { |
| self.opts |
| .unstable_opts |
| .default_visibility |
| .or(self.target.options.default_visibility) |
| .unwrap_or(SymbolVisibility::Interposable) |
| } |
| } |
| |
| // JUSTIFICATION: defn of the suggested wrapper fns |
| #[allow(rustc::bad_opt_access)] |
| impl Session { |
| pub fn verbose_internals(&self) -> bool { |
| self.opts.unstable_opts.verbose_internals |
| } |
| |
| pub fn print_llvm_stats(&self) -> bool { |
| self.opts.unstable_opts.print_codegen_stats |
| } |
| |
| pub fn verify_llvm_ir(&self) -> bool { |
| self.opts.unstable_opts.verify_llvm_ir || option_env!("RUSTC_VERIFY_LLVM_IR").is_some() |
| } |
| |
| pub fn binary_dep_depinfo(&self) -> bool { |
| self.opts.unstable_opts.binary_dep_depinfo |
| } |
| |
| pub fn mir_opt_level(&self) -> usize { |
| self.opts |
| .unstable_opts |
| .mir_opt_level |
| .unwrap_or_else(|| if self.opts.optimize != OptLevel::No { 2 } else { 1 }) |
| } |
| |
| /// 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.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 => { |
| // The user explicitly asked for ThinLTO |
| return 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_local_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.unstable_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().as_usize() == 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.panic_strategy) |
| } |
| |
| pub fn fewer_names(&self) -> bool { |
| if let Some(fewer_names) = self.opts.unstable_opts.fewer_names { |
| fewer_names |
| } else { |
| 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.unstable_opts.sanitizer.intersects(SanitizerSet::ADDRESS | SanitizerSet::MEMORY); |
| !more_names |
| } |
| } |
| |
| pub fn unstable_options(&self) -> bool { |
| self.opts.unstable_opts.unstable_options |
| } |
| |
| pub fn is_nightly_build(&self) -> bool { |
| self.opts.unstable_features.is_nightly_build() |
| } |
| |
| pub fn overflow_checks(&self) -> bool { |
| self.opts.cg.overflow_checks.unwrap_or(self.opts.debug_assertions) |
| } |
| |
| pub fn ub_checks(&self) -> bool { |
| self.opts.unstable_opts.ub_checks.unwrap_or(self.opts.debug_assertions) |
| } |
| |
| pub fn relocation_model(&self) -> RelocModel { |
| self.opts.cg.relocation_model.unwrap_or(self.target.relocation_model) |
| } |
| |
| pub fn code_model(&self) -> Option<CodeModel> { |
| self.opts.cg.code_model.or(self.target.code_model) |
| } |
| |
| pub fn tls_model(&self) -> TlsModel { |
| self.opts.unstable_opts.tls_model.unwrap_or(self.target.tls_model) |
| } |
| |
| pub fn direct_access_external_data(&self) -> Option<bool> { |
| self.opts |
| .unstable_opts |
| .direct_access_external_data |
| .or(self.target.direct_access_external_data) |
| } |
| |
| pub fn split_debuginfo(&self) -> SplitDebuginfo { |
| self.opts.cg.split_debuginfo.unwrap_or(self.target.split_debuginfo) |
| } |
| |
| pub fn stack_protector(&self) -> StackProtector { |
| if self.target.options.supports_stack_protector { |
| self.opts.unstable_opts.stack_protector |
| } else { |
| StackProtector::None |
| } |
| } |
| |
| pub fn must_emit_unwind_tables(&self) -> bool { |
| // This is used to control the emission of the `uwtable` attribute on |
| // LLVM functions. |
| // |
| // Unwind tables are needed when compiling with `-C panic=unwind`, but |
| // LLVM won't omit unwind tables unless the function is also marked as |
| // `nounwind`, so users are allowed to disable `uwtable` emission. |
| // Historically rustc always emits `uwtable` attributes by default, so |
| // even they can be disabled, they're still emitted by default. |
| // |
| // 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. |
| self.target.requires_uwtable |
| || self.opts.cg.force_unwind_tables.unwrap_or( |
| self.panic_strategy() == PanicStrategy::Unwind || self.target.default_uwtable, |
| ) |
| } |
| |
| /// Returns the number of query threads that should be used for this |
| /// compilation |
| #[inline] |
| pub fn threads(&self) -> usize { |
| self.opts.unstable_opts.threads |
| } |
| |
| /// Returns the number of codegen units that should be used for this |
| /// compilation |
| pub fn codegen_units(&self) -> CodegenUnits { |
| if let Some(n) = self.opts.cli_forced_codegen_units { |
| return CodegenUnits::User(n); |
| } |
| if let Some(n) = self.target.default_codegen_units { |
| return CodegenUnits::Default(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 CodegenUnits::Default(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. |
| CodegenUnits::Default(16) |
| } |
| |
| pub fn teach(&self, code: ErrCode) -> bool { |
| self.opts.unstable_opts.teach && self.dcx().must_teach(code) |
| } |
| |
| pub fn edition(&self) -> Edition { |
| self.opts.edition |
| } |
| |
| pub fn link_dead_code(&self) -> bool { |
| self.opts.cg.link_dead_code.unwrap_or(false) |
| } |
| |
| pub fn filename_display_preference( |
| &self, |
| scope: RemapPathScopeComponents, |
| ) -> FileNameDisplayPreference { |
| assert!( |
| scope.bits().count_ones() == 1, |
| "one and only one scope should be passed to `Session::filename_display_preference`" |
| ); |
| if self.opts.unstable_opts.remap_path_scope.contains(scope) { |
| FileNameDisplayPreference::Remapped |
| } else { |
| FileNameDisplayPreference::Local |
| } |
| } |
| } |
| |
| // JUSTIFICATION: part of session construction |
| #[allow(rustc::bad_opt_access)] |
| fn default_emitter( |
| sopts: &config::Options, |
| registry: rustc_errors::registry::Registry, |
| source_map: Lrc<SourceMap>, |
| bundle: Option<Lrc<FluentBundle>>, |
| fallback_bundle: LazyFallbackBundle, |
| ) -> Box<DynEmitter> { |
| let macro_backtrace = sopts.unstable_opts.macro_backtrace; |
| let track_diagnostics = sopts.unstable_opts.track_diagnostics; |
| let terminal_url = match sopts.unstable_opts.terminal_urls { |
| TerminalUrl::Auto => { |
| match (std::env::var("COLORTERM").as_deref(), std::env::var("TERM").as_deref()) { |
| (Ok("truecolor"), Ok("xterm-256color")) |
| if sopts.unstable_features.is_nightly_build() => |
| { |
| TerminalUrl::Yes |
| } |
| _ => TerminalUrl::No, |
| } |
| } |
| t => t, |
| }; |
| match sopts.error_format { |
| config::ErrorOutputType::HumanReadable(kind, color_config) => { |
| let short = kind.short(); |
| |
| if let HumanReadableErrorType::AnnotateSnippet = kind { |
| let emitter = AnnotateSnippetEmitter::new( |
| Some(source_map), |
| bundle, |
| fallback_bundle, |
| short, |
| macro_backtrace, |
| ); |
| Box::new(emitter.ui_testing(sopts.unstable_opts.ui_testing)) |
| } else { |
| let emitter = HumanEmitter::new(stderr_destination(color_config), fallback_bundle) |
| .fluent_bundle(bundle) |
| .sm(Some(source_map)) |
| .short_message(short) |
| .teach(sopts.unstable_opts.teach) |
| .diagnostic_width(sopts.diagnostic_width) |
| .macro_backtrace(macro_backtrace) |
| .track_diagnostics(track_diagnostics) |
| .terminal_url(terminal_url) |
| .ignored_directories_in_source_blocks( |
| sopts.unstable_opts.ignore_directory_in_diagnostics_source_blocks.clone(), |
| ); |
| Box::new(emitter.ui_testing(sopts.unstable_opts.ui_testing)) |
| } |
| } |
| config::ErrorOutputType::Json { pretty, json_rendered, color_config } => Box::new( |
| JsonEmitter::new( |
| Box::new(io::BufWriter::new(io::stderr())), |
| source_map, |
| fallback_bundle, |
| pretty, |
| json_rendered, |
| color_config, |
| ) |
| .registry(Some(registry)) |
| .fluent_bundle(bundle) |
| .ui_testing(sopts.unstable_opts.ui_testing) |
| .ignored_directories_in_source_blocks( |
| sopts.unstable_opts.ignore_directory_in_diagnostics_source_blocks.clone(), |
| ) |
| .diagnostic_width(sopts.diagnostic_width) |
| .macro_backtrace(macro_backtrace) |
| .track_diagnostics(track_diagnostics) |
| .terminal_url(terminal_url), |
| ), |
| } |
| } |
| |
| // JUSTIFICATION: literally session construction |
| #[allow(rustc::bad_opt_access)] |
| #[allow(rustc::untranslatable_diagnostic)] // FIXME: make this translatable |
| pub fn build_session( |
| early_dcx: EarlyDiagCtxt, |
| sopts: config::Options, |
| io: CompilerIO, |
| bundle: Option<Lrc<rustc_errors::FluentBundle>>, |
| registry: rustc_errors::registry::Registry, |
| fluent_resources: Vec<&'static str>, |
| driver_lint_caps: FxHashMap<lint::LintId, lint::Level>, |
| target: Target, |
| sysroot: PathBuf, |
| cfg_version: &'static str, |
| ice_file: Option<PathBuf>, |
| using_internal_features: Arc<AtomicBool>, |
| expanded_args: Vec<String>, |
| ) -> 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() |
| .rfind(|&(key, _)| *key == "warnings") |
| .is_some_and(|&(_, level)| level == lint::Allow); |
| let cap_lints_allow = sopts.lint_cap.is_some_and(|cap| cap == lint::Allow); |
| let can_emit_warnings = !(warnings_allow || cap_lints_allow); |
| |
| let host_triple = TargetTriple::from_triple(config::host_triple()); |
| let (host, target_warnings) = Target::search(&host_triple, &sysroot).unwrap_or_else(|e| { |
| early_dcx.early_fatal(format!("Error loading host specification: {e}")) |
| }); |
| for warning in target_warnings.warning_messages() { |
| early_dcx.early_warn(warning) |
| } |
| |
| let fallback_bundle = fallback_fluent_bundle( |
| fluent_resources, |
| sopts.unstable_opts.translate_directionality_markers, |
| ); |
| let source_map = rustc_span::source_map::get_source_map().unwrap(); |
| let emitter = default_emitter(&sopts, registry, source_map.clone(), bundle, fallback_bundle); |
| |
| let mut dcx = |
| DiagCtxt::new(emitter).with_flags(sopts.unstable_opts.dcx_flags(can_emit_warnings)); |
| if let Some(ice_file) = ice_file { |
| dcx = dcx.with_ice_file(ice_file); |
| } |
| |
| // Now that the proper handler has been constructed, drop early_dcx to |
| // prevent accidental use. |
| drop(early_dcx); |
| |
| let self_profiler = if let SwitchWithOptPath::Enabled(ref d) = sopts.unstable_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_deref(), |
| sopts.unstable_opts.self_profile_events.as_deref(), |
| &sopts.unstable_opts.self_profile_counter, |
| ); |
| match profiler { |
| Ok(profiler) => Some(Arc::new(profiler)), |
| Err(e) => { |
| dcx.handle().emit_warn(errors::FailedToCreateProfiler { err: e.to_string() }); |
| None |
| } |
| } |
| } else { |
| None |
| }; |
| |
| let mut psess = ParseSess::with_dcx(dcx, source_map); |
| psess.assume_incomplete_release = sopts.unstable_opts.assume_incomplete_release; |
| |
| let host_triple = config::host_triple(); |
| let target_triple = sopts.target_triple.triple(); |
| let host_tlib_path = Lrc::new(SearchPath::from_sysroot_and_triple(&sysroot, host_triple)); |
| let target_tlib_path = if host_triple == target_triple { |
| // Use the same `SearchPath` if host and target triple are identical to avoid unnecessary |
| // rescanning of the target lib path and an unnecessary allocation. |
| host_tlib_path.clone() |
| } else { |
| Lrc::new(SearchPath::from_sysroot_and_triple(&sysroot, target_triple)) |
| }; |
| |
| let optimization_fuel = Lock::new(OptimizationFuel { |
| remaining: sopts.unstable_opts.fuel.as_ref().map_or(0, |&(_, i)| i), |
| out_of_fuel: false, |
| }); |
| let print_fuel = AtomicU64::new(0); |
| |
| let prof = SelfProfilerRef::new( |
| self_profiler, |
| sopts.unstable_opts.time_passes.then(|| sopts.unstable_opts.time_passes_format), |
| ); |
| |
| 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, |
| }); |
| |
| let asm_arch = if target.allow_asm { InlineAsmArch::from_str(&target.arch).ok() } else { None }; |
| |
| let sess = Session { |
| target, |
| host, |
| opts: sopts, |
| host_tlib_path, |
| target_tlib_path, |
| psess, |
| sysroot, |
| io, |
| incr_comp_session: RwLock::new(IncrCompSession::NotInitialized), |
| prof, |
| code_stats: Default::default(), |
| optimization_fuel, |
| print_fuel, |
| jobserver: jobserver::client(), |
| lint_store: None, |
| registered_lints: false, |
| driver_lint_caps, |
| ctfe_backtrace, |
| miri_unleashed_features: Lock::new(Default::default()), |
| asm_arch, |
| target_features: Default::default(), |
| unstable_target_features: Default::default(), |
| cfg_version, |
| using_internal_features, |
| expanded_args, |
| }; |
| |
| validate_commandline_args_with_session_available(&sess); |
| |
| sess |
| } |
| |
| /// Validate command line arguments with a `Session`. |
| /// |
| /// If it is useful to have a Session available already for validating a commandline argument, you |
| /// can do so here. |
| // JUSTIFICATION: needs to access args to validate them |
| #[allow(rustc::bad_opt_access)] |
| 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 linkers |
| // on Windows 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 Windows |
| // 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.is_like_windows |
| { |
| sess.dcx().emit_err(errors::LinkerPluginToWindowsNotSupported); |
| } |
| |
| // 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.dcx().emit_err(errors::ProfileUseFileDoesNotExist { path }); |
| } |
| } |
| |
| // Do the same for sample profile data. |
| if let Some(ref path) = sess.opts.unstable_opts.profile_sample_use { |
| if !path.exists() { |
| sess.dcx().emit_err(errors::ProfileSampleUseFileDoesNotExist { path }); |
| } |
| } |
| |
| // Unwind tables cannot be disabled if the target requires them. |
| if let Some(include_uwtables) = sess.opts.cg.force_unwind_tables { |
| if sess.target.requires_uwtable && !include_uwtables { |
| sess.dcx().emit_err(errors::TargetRequiresUnwindTables); |
| } |
| } |
| |
| // Sanitizers can only be used on platforms that we know have working sanitizer codegen. |
| let supported_sanitizers = sess.target.options.supported_sanitizers; |
| let mut unsupported_sanitizers = sess.opts.unstable_opts.sanitizer - supported_sanitizers; |
| // Niche: if `fixed-x18`, or effectively switching on `reserved-x18` flag, is enabled |
| // we should allow Shadow Call Stack sanitizer. |
| if sess.opts.unstable_opts.fixed_x18 && sess.target.arch == "aarch64" { |
| unsupported_sanitizers -= SanitizerSet::SHADOWCALLSTACK; |
| } |
| match unsupported_sanitizers.into_iter().count() { |
| 0 => {} |
| 1 => { |
| sess.dcx() |
| .emit_err(errors::SanitizerNotSupported { us: unsupported_sanitizers.to_string() }); |
| } |
| _ => { |
| sess.dcx().emit_err(errors::SanitizersNotSupported { |
| us: unsupported_sanitizers.to_string(), |
| }); |
| } |
| } |
| |
| // Cannot mix and match mutually-exclusive sanitizers. |
| if let Some((first, second)) = sess.opts.unstable_opts.sanitizer.mutually_exclusive() { |
| sess.dcx().emit_err(errors::CannotMixAndMatchSanitizers { |
| first: first.to_string(), |
| second: second.to_string(), |
| }); |
| } |
| |
| // Cannot enable crt-static with sanitizers on Linux |
| if sess.crt_static(None) |
| && !sess.opts.unstable_opts.sanitizer.is_empty() |
| && !sess.target.is_like_msvc |
| { |
| sess.dcx().emit_err(errors::CannotEnableCrtStaticLinux); |
| } |
| |
| // LLVM CFI requires LTO. |
| if sess.is_sanitizer_cfi_enabled() |
| && !(sess.lto() == config::Lto::Fat || sess.opts.cg.linker_plugin_lto.enabled()) |
| { |
| sess.dcx().emit_err(errors::SanitizerCfiRequiresLto); |
| } |
| |
| // KCFI requires panic=abort |
| if sess.is_sanitizer_kcfi_enabled() && sess.panic_strategy() != PanicStrategy::Abort { |
| sess.dcx().emit_err(errors::SanitizerKcfiRequiresPanicAbort); |
| } |
| |
| // LLVM CFI using rustc LTO requires a single codegen unit. |
| if sess.is_sanitizer_cfi_enabled() |
| && sess.lto() == config::Lto::Fat |
| && (sess.codegen_units().as_usize() != 1) |
| { |
| sess.dcx().emit_err(errors::SanitizerCfiRequiresSingleCodegenUnit); |
| } |
| |
| // Canonical jump tables requires CFI. |
| if sess.is_sanitizer_cfi_canonical_jump_tables_disabled() { |
| if !sess.is_sanitizer_cfi_enabled() { |
| sess.dcx().emit_err(errors::SanitizerCfiCanonicalJumpTablesRequiresCfi); |
| } |
| } |
| |
| // LLVM CFI pointer generalization requires CFI or KCFI. |
| if sess.is_sanitizer_cfi_generalize_pointers_enabled() { |
| if !(sess.is_sanitizer_cfi_enabled() || sess.is_sanitizer_kcfi_enabled()) { |
| sess.dcx().emit_err(errors::SanitizerCfiGeneralizePointersRequiresCfi); |
| } |
| } |
| |
| // LLVM CFI integer normalization requires CFI or KCFI. |
| if sess.is_sanitizer_cfi_normalize_integers_enabled() { |
| if !(sess.is_sanitizer_cfi_enabled() || sess.is_sanitizer_kcfi_enabled()) { |
| sess.dcx().emit_err(errors::SanitizerCfiNormalizeIntegersRequiresCfi); |
| } |
| } |
| |
| // LTO unit splitting requires LTO. |
| if sess.is_split_lto_unit_enabled() |
| && !(sess.lto() == config::Lto::Fat |
| || sess.lto() == config::Lto::Thin |
| || sess.opts.cg.linker_plugin_lto.enabled()) |
| { |
| sess.dcx().emit_err(errors::SplitLtoUnitRequiresLto); |
| } |
| |
| // VFE requires LTO. |
| if sess.lto() != config::Lto::Fat { |
| if sess.opts.unstable_opts.virtual_function_elimination { |
| sess.dcx().emit_err(errors::UnstableVirtualFunctionElimination); |
| } |
| } |
| |
| if sess.opts.unstable_opts.stack_protector != StackProtector::None { |
| if !sess.target.options.supports_stack_protector { |
| sess.dcx().emit_warn(errors::StackProtectorNotSupportedForTarget { |
| stack_protector: sess.opts.unstable_opts.stack_protector, |
| target_triple: &sess.opts.target_triple, |
| }); |
| } |
| } |
| |
| if sess.opts.unstable_opts.small_data_threshold.is_some() { |
| if sess.target.small_data_threshold_support() == SmallDataThresholdSupport::None { |
| sess.dcx().emit_warn(errors::SmallDataThresholdNotSupportedForTarget { |
| target_triple: &sess.opts.target_triple, |
| }) |
| } |
| } |
| |
| if sess.opts.unstable_opts.branch_protection.is_some() && sess.target.arch != "aarch64" { |
| sess.dcx().emit_err(errors::BranchProtectionRequiresAArch64); |
| } |
| |
| if let Some(dwarf_version) = sess.opts.unstable_opts.dwarf_version { |
| if dwarf_version > 5 { |
| sess.dcx().emit_err(errors::UnsupportedDwarfVersion { dwarf_version }); |
| } |
| } |
| |
| if !sess.target.options.supported_split_debuginfo.contains(&sess.split_debuginfo()) |
| && !sess.opts.unstable_opts.unstable_options |
| { |
| sess.dcx() |
| .emit_err(errors::SplitDebugInfoUnstablePlatform { debuginfo: sess.split_debuginfo() }); |
| } |
| |
| if sess.opts.unstable_opts.embed_source { |
| let dwarf_version = |
| sess.opts.unstable_opts.dwarf_version.unwrap_or(sess.target.default_dwarf_version); |
| |
| if dwarf_version < 5 { |
| sess.dcx().emit_warn(errors::EmbedSourceInsufficientDwarfVersion { dwarf_version }); |
| } |
| |
| if sess.opts.debuginfo == DebugInfo::None { |
| sess.dcx().emit_warn(errors::EmbedSourceRequiresDebugInfo); |
| } |
| } |
| |
| if sess.opts.unstable_opts.instrument_xray.is_some() && !sess.target.options.supports_xray { |
| sess.dcx().emit_err(errors::InstrumentationNotSupported { us: "XRay".to_string() }); |
| } |
| |
| if let Some(flavor) = sess.opts.cg.linker_flavor { |
| if let Some(compatible_list) = sess.target.linker_flavor.check_compatibility(flavor) { |
| let flavor = flavor.desc(); |
| sess.dcx().emit_err(errors::IncompatibleLinkerFlavor { flavor, compatible_list }); |
| } |
| } |
| |
| if sess.opts.unstable_opts.function_return != FunctionReturn::default() { |
| if sess.target.arch != "x86" && sess.target.arch != "x86_64" { |
| sess.dcx().emit_err(errors::FunctionReturnRequiresX86OrX8664); |
| } |
| } |
| |
| // The code model check applies to `thunk` and `thunk-extern`, but not `thunk-inline`, so it is |
| // kept as a `match` to force a change if new ones are added, even if we currently only support |
| // `thunk-extern` like Clang. |
| match sess.opts.unstable_opts.function_return { |
| FunctionReturn::Keep => (), |
| FunctionReturn::ThunkExtern => { |
| // FIXME: In principle, the inherited base LLVM target code model could be large, |
| // but this only checks whether we were passed one explicitly (like Clang does). |
| if let Some(code_model) = sess.code_model() |
| && code_model == CodeModel::Large |
| { |
| sess.dcx().emit_err(errors::FunctionReturnThunkExternRequiresNonLargeCodeModel); |
| } |
| } |
| } |
| |
| if sess.opts.cg.soft_float { |
| if sess.target.arch == "arm" && sess.target.abi == "eabihf" { |
| sess.dcx().emit_warn(errors::SoftFloatDeprecated); |
| } else { |
| // All `use_softfp` does is the equivalent of `-mfloat-abi` in GCC/clang, which only exists on ARM targets. |
| // We document this flag to only affect `*eabihf` targets, so let's show a warning for all other targets. |
| sess.dcx().emit_warn(errors::SoftFloatIgnored); |
| } |
| } |
| } |
| |
| /// Holds data on the current incremental compilation session, if there is one. |
| #[derive(Debug)] |
| 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. `_lock_file` is never directly used, but its presence |
| /// alone has an effect, because the file will unlock when the session is |
| /// dropped. |
| Active { session_directory: PathBuf, _lock_file: flock::Lock }, |
| /// 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 }, |
| } |
| |
| /// A wrapper around an [`DiagCtxt`] that is used for early error emissions. |
| pub struct EarlyDiagCtxt { |
| dcx: DiagCtxt, |
| } |
| |
| impl EarlyDiagCtxt { |
| pub fn new(output: ErrorOutputType) -> Self { |
| let emitter = mk_emitter(output); |
| Self { dcx: DiagCtxt::new(emitter) } |
| } |
| |
| /// Swap out the underlying dcx once we acquire the user's preference on error emission |
| /// format. Any errors prior to that will cause an abort and all stashed diagnostics of the |
| /// previous dcx will be emitted. |
| pub fn abort_if_error_and_set_error_format(&mut self, output: ErrorOutputType) { |
| self.dcx.handle().abort_if_errors(); |
| |
| let emitter = mk_emitter(output); |
| self.dcx = DiagCtxt::new(emitter); |
| } |
| |
| #[allow(rustc::untranslatable_diagnostic)] |
| #[allow(rustc::diagnostic_outside_of_impl)] |
| pub fn early_note(&self, msg: impl Into<DiagMessage>) { |
| self.dcx.handle().note(msg) |
| } |
| |
| #[allow(rustc::untranslatable_diagnostic)] |
| #[allow(rustc::diagnostic_outside_of_impl)] |
| pub fn early_help(&self, msg: impl Into<DiagMessage>) { |
| self.dcx.handle().struct_help(msg).emit() |
| } |
| |
| #[allow(rustc::untranslatable_diagnostic)] |
| #[allow(rustc::diagnostic_outside_of_impl)] |
| #[must_use = "ErrorGuaranteed must be returned from `run_compiler` in order to exit with a non-zero status code"] |
| pub fn early_err(&self, msg: impl Into<DiagMessage>) -> ErrorGuaranteed { |
| self.dcx.handle().err(msg) |
| } |
| |
| #[allow(rustc::untranslatable_diagnostic)] |
| #[allow(rustc::diagnostic_outside_of_impl)] |
| pub fn early_fatal(&self, msg: impl Into<DiagMessage>) -> ! { |
| self.dcx.handle().fatal(msg) |
| } |
| |
| #[allow(rustc::untranslatable_diagnostic)] |
| #[allow(rustc::diagnostic_outside_of_impl)] |
| pub fn early_struct_fatal(&self, msg: impl Into<DiagMessage>) -> Diag<'_, FatalAbort> { |
| self.dcx.handle().struct_fatal(msg) |
| } |
| |
| #[allow(rustc::untranslatable_diagnostic)] |
| #[allow(rustc::diagnostic_outside_of_impl)] |
| pub fn early_warn(&self, msg: impl Into<DiagMessage>) { |
| self.dcx.handle().warn(msg) |
| } |
| |
| #[allow(rustc::untranslatable_diagnostic)] |
| #[allow(rustc::diagnostic_outside_of_impl)] |
| pub fn early_struct_warn(&self, msg: impl Into<DiagMessage>) -> Diag<'_, ()> { |
| self.dcx.handle().struct_warn(msg) |
| } |
| } |
| |
| fn mk_emitter(output: ErrorOutputType) -> Box<DynEmitter> { |
| // FIXME(#100717): early errors aren't translated at the moment, so this is fine, but it will |
| // need to reference every crate that might emit an early error for translation to work. |
| let fallback_bundle = |
| fallback_fluent_bundle(vec![rustc_errors::DEFAULT_LOCALE_RESOURCE], false); |
| let emitter: Box<DynEmitter> = match output { |
| config::ErrorOutputType::HumanReadable(kind, color_config) => { |
| let short = kind.short(); |
| Box::new( |
| HumanEmitter::new(stderr_destination(color_config), fallback_bundle) |
| .short_message(short), |
| ) |
| } |
| config::ErrorOutputType::Json { pretty, json_rendered, color_config } => { |
| Box::new(JsonEmitter::new( |
| Box::new(io::BufWriter::new(io::stderr())), |
| Lrc::new(SourceMap::new(FilePathMapping::empty())), |
| fallback_bundle, |
| pretty, |
| json_rendered, |
| color_config, |
| )) |
| } |
| }; |
| emitter |
| } |
| |
| pub trait RemapFileNameExt { |
| type Output<'a> |
| where |
| Self: 'a; |
| |
| /// Returns a possibly remapped filename based on the passed scope and remap cli options. |
| /// |
| /// One and only one scope should be passed to this method, it will panic otherwise. |
| fn for_scope(&self, sess: &Session, scope: RemapPathScopeComponents) -> Self::Output<'_>; |
| } |
| |
| impl RemapFileNameExt for rustc_span::FileName { |
| type Output<'a> = rustc_span::FileNameDisplay<'a>; |
| |
| fn for_scope(&self, sess: &Session, scope: RemapPathScopeComponents) -> Self::Output<'_> { |
| assert!( |
| scope.bits().count_ones() == 1, |
| "one and only one scope should be passed to for_scope" |
| ); |
| if sess.opts.unstable_opts.remap_path_scope.contains(scope) { |
| self.prefer_remapped_unconditionaly() |
| } else { |
| self.prefer_local() |
| } |
| } |
| } |
| |
| impl RemapFileNameExt for rustc_span::RealFileName { |
| type Output<'a> = &'a Path; |
| |
| fn for_scope(&self, sess: &Session, scope: RemapPathScopeComponents) -> Self::Output<'_> { |
| assert!( |
| scope.bits().count_ones() == 1, |
| "one and only one scope should be passed to for_scope" |
| ); |
| if sess.opts.unstable_opts.remap_path_scope.contains(scope) { |
| self.remapped_path_if_available() |
| } else { |
| self.local_path_if_available() |
| } |
| } |
| } |
