1 //! Contains infrastructure for configuring the compiler, including parsing
2 //! command-line options.
4 pub use crate::options::*;
6 use crate::search_paths::SearchPath;
7 use crate::utils::{CanonicalizedPath, NativeLib, NativeLibKind};
8 use crate::{early_error, early_warn, Session};
9 use crate::{lint, HashStableContext};
11 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
13 use rustc_data_structures::stable_hasher::ToStableHashKey;
14 use rustc_target::abi::{Align, TargetDataLayout};
15 use rustc_target::spec::{PanicStrategy, SanitizerSet, SplitDebuginfo};
16 use rustc_target::spec::{Target, TargetTriple, TargetWarnings, TARGETS};
18 use crate::parse::{CrateCheckConfig, CrateConfig};
19 use rustc_feature::UnstableFeatures;
20 use rustc_span::edition::{Edition, DEFAULT_EDITION, EDITION_NAME_LIST, LATEST_STABLE_EDITION};
21 use rustc_span::source_map::{FileName, FilePathMapping};
22 use rustc_span::symbol::{sym, Symbol};
23 use rustc_span::RealFileName;
24 use rustc_span::SourceFileHashAlgorithm;
26 use rustc_errors::emitter::HumanReadableErrorType;
27 use rustc_errors::{ColorConfig, HandlerFlags};
29 use std::collections::btree_map::{
30 Iter as BTreeMapIter, Keys as BTreeMapKeysIter, Values as BTreeMapValuesIter,
32 use std::collections::{BTreeMap, BTreeSet};
35 use std::iter::{self, FromIterator};
36 use std::path::{Path, PathBuf};
37 use std::str::{self, FromStr};
41 /// The different settings that the `-C strip` flag can have.
42 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
44 /// Do not strip at all.
50 /// Strip all symbols.
54 /// The different settings that the `-C control-flow-guard` flag can have.
55 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
57 /// Do not emit Control Flow Guard metadata or checks.
60 /// Emit Control Flow Guard metadata but no checks.
63 /// Emit Control Flow Guard metadata and checks.
67 /// The different settings that the `-Z cf-protection` flag can have.
68 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
69 pub enum CFProtection {
70 /// Do not enable control-flow protection
73 /// Emit control-flow protection for branches (enables indirect branch tracking).
76 /// Emit control-flow protection for returns.
79 /// Emit control-flow protection for both branches and returns.
83 #[derive(Clone, Copy, Debug, PartialEq, Hash, HashStable_Generic)]
93 /// This is what the `LtoCli` values get mapped to after resolving defaults and
94 /// and taking other command line options into account.
96 /// Note that linker plugin-based LTO is a different mechanism entirely.
97 #[derive(Clone, PartialEq)]
99 /// Don't do any LTO whatsoever.
102 /// Do a full-crate-graph (inter-crate) LTO with ThinLTO.
105 /// Do a local ThinLTO (intra-crate, over the CodeGen Units of the local crate only). This is
106 /// only relevant if multiple CGUs are used.
109 /// Do a full-crate-graph (inter-crate) LTO with "fat" LTO.
113 /// The different settings that the `-C lto` flag can have.
114 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
126 /// No `-C lto` flag passed
130 /// The different settings that the `-Z dump_mir_spanview` flag can have. `Statement` generates a
131 /// document highlighting each span of every statement (including terminators). `Terminator` and
132 /// `Block` highlight a single span per `BasicBlock`: the span of the block's `Terminator`, or a
133 /// computed span for the block, representing the entire range, covering the block's terminator and
134 /// all of its statements.
135 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
136 pub enum MirSpanview {
137 /// Default `-Z dump_mir_spanview` or `-Z dump_mir_spanview=statement`
139 /// `-Z dump_mir_spanview=terminator`
141 /// `-Z dump_mir_spanview=block`
145 /// The different settings that the `-C instrument-coverage` flag can have.
147 /// Coverage instrumentation now supports combining `-C instrument-coverage`
148 /// with compiler and linker optimization (enabled with `-O` or `-C opt-level=1`
149 /// and higher). Nevertheless, there are many variables, depending on options
150 /// selected, code structure, and enabled attributes. If errors are encountered,
151 /// either while compiling or when generating `llvm-cov show` reports, consider
152 /// lowering the optimization level, including or excluding `-C link-dead-code`,
153 /// or using `-Zunstable-options -C instrument-coverage=except-unused-functions`
154 /// or `-Zunstable-options -C instrument-coverage=except-unused-generics`.
156 /// Note that `ExceptUnusedFunctions` means: When `mapgen.rs` generates the
157 /// coverage map, it will not attempt to generate synthetic functions for unused
158 /// (and not code-generated) functions (whether they are generic or not). As a
159 /// result, non-codegenned functions will not be included in the coverage map,
160 /// and will not appear, as covered or uncovered, in coverage reports.
162 /// `ExceptUnusedGenerics` will add synthetic functions to the coverage map,
163 /// unless the function has type parameters.
164 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
165 pub enum InstrumentCoverage {
166 /// Default `-C instrument-coverage` or `-C instrument-coverage=statement`
168 /// `-Zunstable-options -C instrument-coverage=except-unused-generics`
169 ExceptUnusedGenerics,
170 /// `-Zunstable-options -C instrument-coverage=except-unused-functions`
171 ExceptUnusedFunctions,
172 /// `-C instrument-coverage=off` (or `no`, etc.)
176 #[derive(Clone, PartialEq, Hash, Debug)]
177 pub enum LinkerPluginLto {
178 LinkerPlugin(PathBuf),
183 /// Used with `-Z assert-incr-state`.
184 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
185 pub enum IncrementalStateAssertion {
186 /// Found and loaded an existing session directory.
188 /// Note that this says nothing about whether any particular query
189 /// will be found to be red or green.
191 /// Did not load an existing session directory.
195 impl LinkerPluginLto {
196 pub fn enabled(&self) -> bool {
198 LinkerPluginLto::LinkerPlugin(_) | LinkerPluginLto::LinkerPluginAuto => true,
199 LinkerPluginLto::Disabled => false,
204 /// The different settings that can be enabled via the `-Z location-detail` flag.
205 #[derive(Clone, PartialEq, Hash, Debug)]
206 pub struct LocationDetail {
212 impl LocationDetail {
213 pub fn all() -> Self {
214 Self { file: true, line: true, column: true }
218 #[derive(Clone, PartialEq, Hash, Debug)]
219 pub enum SwitchWithOptPath {
220 Enabled(Option<PathBuf>),
224 impl SwitchWithOptPath {
225 pub fn enabled(&self) -> bool {
227 SwitchWithOptPath::Enabled(_) => true,
228 SwitchWithOptPath::Disabled => false,
233 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, HashStable_Generic)]
234 #[derive(Encodable, Decodable)]
235 pub enum SymbolManglingVersion {
240 #[derive(Clone, Copy, Debug, PartialEq, Hash)]
247 /// Split debug-information is enabled by `-C split-debuginfo`, this enum is only used if split
248 /// debug-information is enabled (in either `Packed` or `Unpacked` modes), and the platform
249 /// uses DWARF for debug-information.
251 /// Some debug-information requires link-time relocation and some does not. LLVM can partition
252 /// the debuginfo into sections depending on whether or not it requires link-time relocation. Split
253 /// DWARF provides a mechanism which allows the linker to skip the sections which don't require
254 /// link-time relocation - either by putting those sections in DWARF object files, or by keeping
255 /// them in the object file in such a way that the linker will skip them.
256 #[derive(Clone, Copy, Debug, PartialEq, Hash)]
257 pub enum SplitDwarfKind {
258 /// Sections which do not require relocation are written into object file but ignored by the
261 /// Sections which do not require relocation are written into a DWARF object (`.dwo`) file
262 /// which is ignored by the linker.
266 impl FromStr for SplitDwarfKind {
269 fn from_str(s: &str) -> Result<Self, ()> {
271 "single" => SplitDwarfKind::Single,
272 "split" => SplitDwarfKind::Split,
278 #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, PartialOrd, Ord, HashStable_Generic)]
279 #[derive(Encodable, Decodable)]
280 pub enum OutputType {
291 impl<HCX: HashStableContext> ToStableHashKey<HCX> for OutputType {
294 fn to_stable_hash_key(&self, _: &HCX) -> Self::KeyType {
300 fn is_compatible_with_codegen_units_and_single_output_file(&self) -> bool {
302 OutputType::Exe | OutputType::DepInfo | OutputType::Metadata => true,
304 | OutputType::Assembly
305 | OutputType::LlvmAssembly
307 | OutputType::Object => false,
311 fn shorthand(&self) -> &'static str {
313 OutputType::Bitcode => "llvm-bc",
314 OutputType::Assembly => "asm",
315 OutputType::LlvmAssembly => "llvm-ir",
316 OutputType::Mir => "mir",
317 OutputType::Object => "obj",
318 OutputType::Metadata => "metadata",
319 OutputType::Exe => "link",
320 OutputType::DepInfo => "dep-info",
324 fn from_shorthand(shorthand: &str) -> Option<Self> {
325 Some(match shorthand {
326 "asm" => OutputType::Assembly,
327 "llvm-ir" => OutputType::LlvmAssembly,
328 "mir" => OutputType::Mir,
329 "llvm-bc" => OutputType::Bitcode,
330 "obj" => OutputType::Object,
331 "metadata" => OutputType::Metadata,
332 "link" => OutputType::Exe,
333 "dep-info" => OutputType::DepInfo,
338 fn shorthands_display() -> String {
340 "`{}`, `{}`, `{}`, `{}`, `{}`, `{}`, `{}`, `{}`",
341 OutputType::Bitcode.shorthand(),
342 OutputType::Assembly.shorthand(),
343 OutputType::LlvmAssembly.shorthand(),
344 OutputType::Mir.shorthand(),
345 OutputType::Object.shorthand(),
346 OutputType::Metadata.shorthand(),
347 OutputType::Exe.shorthand(),
348 OutputType::DepInfo.shorthand(),
352 pub fn extension(&self) -> &'static str {
354 OutputType::Bitcode => "bc",
355 OutputType::Assembly => "s",
356 OutputType::LlvmAssembly => "ll",
357 OutputType::Mir => "mir",
358 OutputType::Object => "o",
359 OutputType::Metadata => "rmeta",
360 OutputType::DepInfo => "d",
361 OutputType::Exe => "",
366 /// The type of diagnostics output to generate.
367 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
368 pub enum ErrorOutputType {
369 /// Output meant for the consumption of humans.
370 HumanReadable(HumanReadableErrorType),
371 /// Output that's consumed by other tools such as `rustfix` or the `RLS`.
373 /// Render the JSON in a human readable way (with indents and newlines).
375 /// The JSON output includes a `rendered` field that includes the rendered
377 json_rendered: HumanReadableErrorType,
381 impl Default for ErrorOutputType {
382 fn default() -> Self {
383 Self::HumanReadable(HumanReadableErrorType::Default(ColorConfig::Auto))
387 /// Parameter to control path trimming.
388 #[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash)]
389 pub enum TrimmedDefPaths {
390 /// `try_print_trimmed_def_path` never prints a trimmed path and never calls the expensive query
393 /// `try_print_trimmed_def_path` calls the expensive query, the query doesn't call `delay_good_path_bug`
395 /// `try_print_trimmed_def_path` calls the expensive query, the query calls `delay_good_path_bug`
399 /// Use tree-based collections to cheaply get a deterministic `Hash` implementation.
400 /// *Do not* switch `BTreeMap` out for an unsorted container type! That would break
401 /// dependency tracking for command-line arguments. Also only hash keys, since tracking
402 /// should only depend on the output types, not the paths they're written to.
403 #[derive(Clone, Debug, Hash, HashStable_Generic)]
404 pub struct OutputTypes(BTreeMap<OutputType, Option<PathBuf>>);
407 pub fn new(entries: &[(OutputType, Option<PathBuf>)]) -> OutputTypes {
408 OutputTypes(BTreeMap::from_iter(entries.iter().map(|&(k, ref v)| (k, v.clone()))))
411 pub fn get(&self, key: &OutputType) -> Option<&Option<PathBuf>> {
415 pub fn contains_key(&self, key: &OutputType) -> bool {
416 self.0.contains_key(key)
419 pub fn keys(&self) -> BTreeMapKeysIter<'_, OutputType, Option<PathBuf>> {
423 pub fn values(&self) -> BTreeMapValuesIter<'_, OutputType, Option<PathBuf>> {
427 pub fn len(&self) -> usize {
431 /// Returns `true` if any of the output types require codegen or linking.
432 pub fn should_codegen(&self) -> bool {
433 self.0.keys().any(|k| match *k {
435 | OutputType::Assembly
436 | OutputType::LlvmAssembly
439 | OutputType::Exe => true,
440 OutputType::Metadata | OutputType::DepInfo => false,
444 /// Returns `true` if any of the output types require linking.
445 pub fn should_link(&self) -> bool {
446 self.0.keys().any(|k| match *k {
448 | OutputType::Assembly
449 | OutputType::LlvmAssembly
451 | OutputType::Metadata
453 | OutputType::DepInfo => false,
454 OutputType::Exe => true,
459 /// Use tree-based collections to cheaply get a deterministic `Hash` implementation.
460 /// *Do not* switch `BTreeMap` or `BTreeSet` out for an unsorted container type! That
461 /// would break dependency tracking for command-line arguments.
463 pub struct Externs(BTreeMap<String, ExternEntry>);
465 #[derive(Clone, Debug)]
466 pub struct ExternEntry {
467 pub location: ExternLocation,
468 /// Indicates this is a "private" dependency for the
469 /// `exported_private_dependencies` lint.
471 /// This can be set with the `priv` option like
472 /// `--extern priv:name=foo.rlib`.
473 pub is_private_dep: bool,
474 /// Add the extern entry to the extern prelude.
476 /// This can be disabled with the `noprelude` option like
477 /// `--extern noprelude:name`.
478 pub add_prelude: bool,
479 /// The extern entry shouldn't be considered for unused dependency warnings.
481 /// `--extern nounused:std=/path/to/lib/libstd.rlib`. This is used to
482 /// suppress `unused-crate-dependencies` warnings.
483 pub nounused_dep: bool,
486 #[derive(Clone, Debug)]
487 pub enum ExternLocation {
488 /// Indicates to look for the library in the search paths.
490 /// Added via `--extern name`.
491 FoundInLibrarySearchDirectories,
492 /// The locations where this extern entry must be found.
494 /// The `CrateLoader` is responsible for loading these and figuring out
495 /// which one to use.
497 /// Added via `--extern prelude_name=some_file.rlib`
498 ExactPaths(BTreeSet<CanonicalizedPath>),
502 /// Used for testing.
503 pub fn new(data: BTreeMap<String, ExternEntry>) -> Externs {
507 pub fn get(&self, key: &str) -> Option<&ExternEntry> {
511 pub fn iter(&self) -> BTreeMapIter<'_, String, ExternEntry> {
515 pub fn len(&self) -> usize {
521 fn new(location: ExternLocation) -> ExternEntry {
522 ExternEntry { location, is_private_dep: false, add_prelude: false, nounused_dep: false }
525 pub fn files(&self) -> Option<impl Iterator<Item = &CanonicalizedPath>> {
526 match &self.location {
527 ExternLocation::ExactPaths(set) => Some(set.iter()),
533 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
534 pub enum PrintRequest {
549 StackProtectorStrategies,
554 /// Load source code from a file.
556 /// Load source code from a string.
558 /// A string that is shown in place of a filename.
560 /// An anonymous string containing the source code.
566 pub fn filestem(&self) -> &str {
568 Input::File(ref ifile) => ifile.file_stem().unwrap().to_str().unwrap(),
569 Input::Str { .. } => "rust_out",
573 pub fn source_name(&self) -> FileName {
575 Input::File(ref ifile) => ifile.clone().into(),
576 Input::Str { ref name, .. } => name.clone(),
581 #[derive(Clone, Hash, Debug, HashStable_Generic)]
582 pub struct OutputFilenames {
583 pub out_directory: PathBuf,
585 pub single_output_file: Option<PathBuf>,
586 pub temps_directory: Option<PathBuf>,
587 pub outputs: OutputTypes,
590 pub const RLINK_EXT: &str = "rlink";
591 pub const RUST_CGU_EXT: &str = "rcgu";
592 pub const DWARF_OBJECT_EXT: &str = "dwo";
594 impl OutputFilenames {
596 out_directory: PathBuf,
597 out_filestem: String,
598 single_output_file: Option<PathBuf>,
599 temps_directory: Option<PathBuf>,
601 outputs: OutputTypes,
608 filestem: format!("{out_filestem}{extra}"),
612 pub fn path(&self, flavor: OutputType) -> PathBuf {
615 .and_then(|p| p.to_owned())
616 .or_else(|| self.single_output_file.clone())
617 .unwrap_or_else(|| self.output_path(flavor))
620 /// Gets the output path where a compilation artifact of the given type
621 /// should be placed on disk.
622 pub fn output_path(&self, flavor: OutputType) -> PathBuf {
623 let extension = flavor.extension();
624 self.with_directory_and_extension(&self.out_directory, &extension)
627 /// Gets the path where a compilation artifact of the given type for the
628 /// given codegen unit should be placed on disk. If codegen_unit_name is
629 /// None, a path distinct from those of any codegen unit will be generated.
630 pub fn temp_path(&self, flavor: OutputType, codegen_unit_name: Option<&str>) -> PathBuf {
631 let extension = flavor.extension();
632 self.temp_path_ext(extension, codegen_unit_name)
635 /// Like `temp_path`, but specifically for dwarf objects.
636 pub fn temp_path_dwo(&self, codegen_unit_name: Option<&str>) -> PathBuf {
637 self.temp_path_ext(DWARF_OBJECT_EXT, codegen_unit_name)
640 /// Like `temp_path`, but also supports things where there is no corresponding
641 /// OutputType, like noopt-bitcode or lto-bitcode.
642 pub fn temp_path_ext(&self, ext: &str, codegen_unit_name: Option<&str>) -> PathBuf {
643 let mut extension = String::new();
645 if let Some(codegen_unit_name) = codegen_unit_name {
646 extension.push_str(codegen_unit_name);
650 if !extension.is_empty() {
652 extension.push_str(RUST_CGU_EXT);
656 extension.push_str(ext);
659 let temps_directory = self.temps_directory.as_ref().unwrap_or(&self.out_directory);
661 self.with_directory_and_extension(&temps_directory, &extension)
664 pub fn with_extension(&self, extension: &str) -> PathBuf {
665 self.with_directory_and_extension(&self.out_directory, extension)
668 fn with_directory_and_extension(&self, directory: &PathBuf, extension: &str) -> PathBuf {
669 let mut path = directory.join(&self.filestem);
670 path.set_extension(extension);
674 /// Returns the path for the Split DWARF file - this can differ depending on which Split DWARF
675 /// mode is being used, which is the logic that this function is intended to encapsulate.
676 pub fn split_dwarf_path(
678 split_debuginfo_kind: SplitDebuginfo,
679 split_dwarf_kind: SplitDwarfKind,
680 cgu_name: Option<&str>,
681 ) -> Option<PathBuf> {
682 let obj_out = self.temp_path(OutputType::Object, cgu_name);
683 let dwo_out = self.temp_path_dwo(cgu_name);
684 match (split_debuginfo_kind, split_dwarf_kind) {
685 (SplitDebuginfo::Off, SplitDwarfKind::Single | SplitDwarfKind::Split) => None,
686 // Single mode doesn't change how DWARF is emitted, but does add Split DWARF attributes
687 // (pointing at the path which is being determined here). Use the path to the current
689 (SplitDebuginfo::Packed | SplitDebuginfo::Unpacked, SplitDwarfKind::Single) => {
692 // Split mode emits the DWARF into a different file, use that path.
693 (SplitDebuginfo::Packed | SplitDebuginfo::Unpacked, SplitDwarfKind::Split) => {
700 pub fn host_triple() -> &'static str {
701 // Get the host triple out of the build environment. This ensures that our
702 // idea of the host triple is the same as for the set of libraries we've
703 // actually built. We can't just take LLVM's host triple because they
704 // normalize all ix86 architectures to i386.
706 // Instead of grabbing the host triple (for the current host), we grab (at
707 // compile time) the target triple that this rustc is built with and
708 // calling that (at runtime) the host triple.
709 (option_env!("CFG_COMPILER_HOST_TRIPLE")).expect("CFG_COMPILER_HOST_TRIPLE")
712 impl Default for Options {
713 fn default() -> Options {
715 assert_incr_state: None,
716 crate_types: Vec::new(),
717 optimize: OptLevel::No,
718 debuginfo: DebugInfo::None,
719 lint_opts: Vec::new(),
721 describe_lints: false,
722 output_types: OutputTypes(BTreeMap::new()),
723 search_paths: vec![],
725 target_triple: TargetTriple::from_triple(host_triple()),
728 unstable_opts: Default::default(),
730 cg: Default::default(),
731 error_format: ErrorOutputType::default(),
732 diagnostic_width: None,
733 externs: Externs(BTreeMap::new()),
736 unstable_features: UnstableFeatures::Disallow,
737 debug_assertions: true,
738 actually_rustdoc: false,
739 trimmed_def_paths: TrimmedDefPaths::default(),
740 cli_forced_codegen_units: None,
741 cli_forced_thinlto_off: false,
742 remap_path_prefix: Vec::new(),
743 real_rust_source_base_dir: None,
744 edition: DEFAULT_EDITION,
745 json_artifact_notifications: false,
746 json_unused_externs: JsonUnusedExterns::No,
747 json_future_incompat: false,
749 working_dir: RealFileName::LocalPath(std::env::current_dir().unwrap()),
755 /// Returns `true` if there is a reason to build the dep graph.
756 pub fn build_dep_graph(&self) -> bool {
757 self.incremental.is_some()
758 || self.unstable_opts.dump_dep_graph
759 || self.unstable_opts.query_dep_graph
762 pub fn file_path_mapping(&self) -> FilePathMapping {
763 FilePathMapping::new(self.remap_path_prefix.clone())
766 /// Returns `true` if there will be an output file generated.
767 pub fn will_create_output_file(&self) -> bool {
768 !self.unstable_opts.parse_only && // The file is just being parsed
769 !self.unstable_opts.ls // The file is just being queried
773 pub fn share_generics(&self) -> bool {
774 match self.unstable_opts.share_generics {
775 Some(setting) => setting,
776 None => match self.optimize {
777 OptLevel::No | OptLevel::Less | OptLevel::Size | OptLevel::SizeMin => true,
778 OptLevel::Default | OptLevel::Aggressive => false,
783 pub fn get_symbol_mangling_version(&self) -> SymbolManglingVersion {
784 self.cg.symbol_mangling_version.unwrap_or(SymbolManglingVersion::Legacy)
788 impl UnstableOptions {
789 pub fn diagnostic_handler_flags(&self, can_emit_warnings: bool) -> HandlerFlags {
792 treat_err_as_bug: self.treat_err_as_bug,
793 dont_buffer_diagnostics: self.dont_buffer_diagnostics,
794 report_delayed_bugs: self.report_delayed_bugs,
795 macro_backtrace: self.macro_backtrace,
796 deduplicate_diagnostics: self.deduplicate_diagnostics,
801 // The type of entry function, so users can have their own entry functions
802 #[derive(Copy, Clone, PartialEq, Hash, Debug, HashStable_Generic)]
803 pub enum EntryFnType {
805 /// Specifies what to do with `SIGPIPE` before calling `fn main()`.
807 /// What values that are valid and what they mean must be in sync
808 /// across rustc and libstd, but we don't want it public in libstd,
809 /// so we take a bit of an unusual approach with simple constants
810 /// and an `include!()`.
816 #[derive(Copy, PartialEq, PartialOrd, Clone, Ord, Eq, Hash, Debug, Encodable, Decodable)]
817 #[derive(HashStable_Generic)]
828 /// When generated, is this crate type an archive?
829 pub fn is_archive(&self) -> bool {
831 CrateType::Rlib | CrateType::Staticlib => true,
832 CrateType::Executable | CrateType::Dylib | CrateType::Cdylib | CrateType::ProcMacro => {
839 #[derive(Clone, Hash, Debug, PartialEq, Eq)]
846 pub fn is_empty(&self) -> bool {
848 Passes::Some(ref v) => v.is_empty(),
849 Passes::All => false,
853 pub fn extend(&mut self, passes: impl IntoIterator<Item = String>) {
855 Passes::Some(ref mut v) => v.extend(passes),
861 #[derive(Clone, Copy, Hash, Debug, PartialEq)]
867 #[derive(Clone, Copy, Hash, Debug, PartialEq)]
873 #[derive(Clone, Copy, Hash, Debug, PartialEq)]
874 pub struct BranchProtection {
876 pub pac_ret: Option<PacRet>,
879 impl Default for BranchProtection {
880 fn default() -> Self {
881 BranchProtection { bti: false, pac_ret: None }
885 pub const fn default_lib_output() -> CrateType {
889 fn default_configuration(sess: &Session) -> CrateConfig {
890 // NOTE: This should be kept in sync with `CrateCheckConfig::fill_well_known` below.
891 let end = &sess.target.endian;
892 let arch = &sess.target.arch;
893 let wordsz = sess.target.pointer_width.to_string();
894 let os = &sess.target.os;
895 let env = &sess.target.env;
896 let abi = &sess.target.abi;
897 let vendor = &sess.target.vendor;
898 let min_atomic_width = sess.target.min_atomic_width();
899 let max_atomic_width = sess.target.max_atomic_width();
900 let atomic_cas = sess.target.atomic_cas;
901 let layout = TargetDataLayout::parse(&sess.target).unwrap_or_else(|err| {
902 sess.emit_fatal(err);
905 let mut ret = CrateConfig::default();
906 ret.reserve(7); // the minimum number of insertions
908 ret.insert((sym::target_os, Some(Symbol::intern(os))));
909 for fam in sess.target.families.as_ref() {
910 ret.insert((sym::target_family, Some(Symbol::intern(fam))));
911 if fam == "windows" {
912 ret.insert((sym::windows, None));
913 } else if fam == "unix" {
914 ret.insert((sym::unix, None));
917 ret.insert((sym::target_arch, Some(Symbol::intern(arch))));
918 ret.insert((sym::target_endian, Some(Symbol::intern(end.as_str()))));
919 ret.insert((sym::target_pointer_width, Some(Symbol::intern(&wordsz))));
920 ret.insert((sym::target_env, Some(Symbol::intern(env))));
921 ret.insert((sym::target_abi, Some(Symbol::intern(abi))));
922 ret.insert((sym::target_vendor, Some(Symbol::intern(vendor))));
923 if sess.target.has_thread_local {
924 ret.insert((sym::target_thread_local, None));
927 (8, layout.i8_align.abi),
928 (16, layout.i16_align.abi),
929 (32, layout.i32_align.abi),
930 (64, layout.i64_align.abi),
931 (128, layout.i128_align.abi),
933 if i >= min_atomic_width && i <= max_atomic_width {
934 let mut insert_atomic = |s, align: Align| {
935 ret.insert((sym::target_has_atomic_load_store, Some(Symbol::intern(s))));
937 ret.insert((sym::target_has_atomic, Some(Symbol::intern(s))));
939 if align.bits() == i {
940 ret.insert((sym::target_has_atomic_equal_alignment, Some(Symbol::intern(s))));
943 let s = i.to_string();
944 insert_atomic(&s, align);
946 insert_atomic("ptr", layout.pointer_align.abi);
951 let panic_strategy = sess.panic_strategy();
952 ret.insert((sym::panic, Some(panic_strategy.desc_symbol())));
954 for s in sess.opts.unstable_opts.sanitizer {
955 let symbol = Symbol::intern(&s.to_string());
956 ret.insert((sym::sanitize, Some(symbol)));
959 if sess.opts.debug_assertions {
960 ret.insert((sym::debug_assertions, None));
962 // JUSTIFICATION: before wrapper fn is available
963 #[allow(rustc::bad_opt_access)]
964 if sess.opts.crate_types.contains(&CrateType::ProcMacro) {
965 ret.insert((sym::proc_macro, None));
970 /// Converts the crate `cfg!` configuration from `String` to `Symbol`.
971 /// `rustc_interface::interface::Config` accepts this in the compiler configuration,
972 /// but the symbol interner is not yet set up then, so we must convert it later.
973 pub fn to_crate_config(cfg: FxHashSet<(String, Option<String>)>) -> CrateConfig {
974 cfg.into_iter().map(|(a, b)| (Symbol::intern(&a), b.map(|b| Symbol::intern(&b)))).collect()
977 /// The parsed `--check-cfg` options
978 pub struct CheckCfg<T = String> {
979 /// The set of all `names()`, if None no name checking is performed
980 pub names_valid: Option<FxHashSet<T>>,
981 /// Is well known values activated
982 pub well_known_values: bool,
983 /// The set of all `values()`
984 pub values_valid: FxHashMap<T, FxHashSet<T>>,
987 impl<T> Default for CheckCfg<T> {
988 fn default() -> Self {
990 names_valid: Default::default(),
991 values_valid: Default::default(),
992 well_known_values: false,
997 impl<T> CheckCfg<T> {
998 fn map_data<O: Eq + Hash>(&self, f: impl Fn(&T) -> O) -> CheckCfg<O> {
1003 .map(|names_valid| names_valid.iter().map(|a| f(a)).collect()),
1007 .map(|(a, b)| (f(a), b.iter().map(|b| f(b)).collect()))
1009 well_known_values: self.well_known_values,
1014 /// Converts the crate `--check-cfg` options from `String` to `Symbol`.
1015 /// `rustc_interface::interface::Config` accepts this in the compiler configuration,
1016 /// but the symbol interner is not yet set up then, so we must convert it later.
1017 pub fn to_crate_check_config(cfg: CheckCfg) -> CrateCheckConfig {
1018 cfg.map_data(|s| Symbol::intern(s))
1021 impl CrateCheckConfig {
1022 /// Fills a `CrateCheckConfig` with well-known configuration names.
1023 fn fill_well_known_names(&mut self) {
1024 // NOTE: This should be kept in sync with `default_configuration` and
1025 // `fill_well_known_values`
1026 const WELL_KNOWN_NAMES: &[Symbol] = &[
1034 sym::target_pointer_width,
1038 sym::target_thread_local,
1039 sym::target_has_atomic_load_store,
1040 sym::target_has_atomic,
1041 sym::target_has_atomic_equal_alignment,
1042 sym::target_feature,
1045 sym::debug_assertions,
1056 // We only insert well-known names if `names()` was activated
1057 if let Some(names_valid) = &mut self.names_valid {
1058 names_valid.extend(WELL_KNOWN_NAMES);
1062 /// Fills a `CrateCheckConfig` with well-known configuration values.
1063 fn fill_well_known_values(&mut self) {
1064 if !self.well_known_values {
1068 // NOTE: This should be kept in sync with `default_configuration` and
1069 // `fill_well_known_names`
1071 let panic_values = &PanicStrategy::all();
1073 let atomic_values = &[
1075 sym::integer(8usize),
1076 sym::integer(16usize),
1077 sym::integer(32usize),
1078 sym::integer(64usize),
1079 sym::integer(128usize),
1082 let sanitize_values = SanitizerSet::all()
1084 .map(|sanitizer| Symbol::intern(sanitizer.as_str().unwrap()));
1086 // Unknown possible values:
1088 // - `target_feature`
1099 sym::debug_assertions,
1100 sym::target_thread_local,
1102 self.values_valid.entry(name).or_default();
1105 // Pre-defined values
1106 self.values_valid.entry(sym::panic).or_default().extend(panic_values);
1107 self.values_valid.entry(sym::sanitize).or_default().extend(sanitize_values);
1108 self.values_valid.entry(sym::target_has_atomic).or_default().extend(atomic_values);
1110 .entry(sym::target_has_atomic_load_store)
1112 .extend(atomic_values);
1114 .entry(sym::target_has_atomic_equal_alignment)
1116 .extend(atomic_values);
1118 // Target specific values
1120 const VALUES: [&Symbol; 8] = [
1122 &sym::target_family,
1124 &sym::target_endian,
1127 &sym::target_vendor,
1128 &sym::target_pointer_width,
1131 // Initialize (if not already initialized)
1133 self.values_valid.entry(e).or_default();
1136 // Get all values map at once otherwise it would be costly.
1137 // (8 values * 220 targets ~= 1760 times, at the time of writing this comment).
1140 values_target_family,
1142 values_target_endian,
1145 values_target_vendor,
1146 values_target_pointer_width,
1149 .get_many_mut(VALUES)
1150 .expect("unable to get all the check-cfg values buckets");
1152 for target in TARGETS
1154 .map(|target| Target::expect_builtin(&TargetTriple::from_triple(target)))
1156 values_target_os.insert(Symbol::intern(&target.options.os));
1157 values_target_family
1158 .extend(target.options.families.iter().map(|family| Symbol::intern(family)));
1159 values_target_arch.insert(Symbol::intern(&target.arch));
1160 values_target_endian.insert(Symbol::intern(&target.options.endian.as_str()));
1161 values_target_env.insert(Symbol::intern(&target.options.env));
1162 values_target_abi.insert(Symbol::intern(&target.options.abi));
1163 values_target_vendor.insert(Symbol::intern(&target.options.vendor));
1164 values_target_pointer_width.insert(sym::integer(target.pointer_width));
1169 pub fn fill_well_known(&mut self) {
1170 self.fill_well_known_names();
1171 self.fill_well_known_values();
1175 pub fn build_configuration(sess: &Session, mut user_cfg: CrateConfig) -> CrateConfig {
1176 // Combine the configuration requested by the session (command line) with
1177 // some default and generated configuration items.
1178 let default_cfg = default_configuration(sess);
1179 // If the user wants a test runner, then add the test cfg.
1181 user_cfg.insert((sym::test, None));
1183 user_cfg.extend(default_cfg.iter().cloned());
1187 pub(super) fn build_target_config(
1189 target_override: Option<Target>,
1192 let target_result = target_override.map_or_else(
1193 || Target::search(&opts.target_triple, sysroot),
1194 |t| Ok((t, TargetWarnings::empty())),
1196 let (target, target_warnings) = target_result.unwrap_or_else(|e| {
1200 "Error loading target specification: {}. \
1201 Run `rustc --print target-list` for a list of built-in targets",
1206 for warning in target_warnings.warning_messages() {
1207 early_warn(opts.error_format, &warning)
1210 if !matches!(target.pointer_width, 16 | 32 | 64) {
1214 "target specification was invalid: \
1215 unrecognized target-pointer-width {}",
1216 target.pointer_width
1224 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
1225 pub enum OptionStability {
1230 pub struct RustcOptGroup {
1231 pub apply: Box<dyn Fn(&mut getopts::Options) -> &mut getopts::Options>,
1232 pub name: &'static str,
1233 pub stability: OptionStability,
1236 impl RustcOptGroup {
1237 pub fn is_stable(&self) -> bool {
1238 self.stability == OptionStability::Stable
1241 pub fn stable<F>(name: &'static str, f: F) -> RustcOptGroup
1243 F: Fn(&mut getopts::Options) -> &mut getopts::Options + 'static,
1245 RustcOptGroup { name, apply: Box::new(f), stability: OptionStability::Stable }
1248 pub fn unstable<F>(name: &'static str, f: F) -> RustcOptGroup
1250 F: Fn(&mut getopts::Options) -> &mut getopts::Options + 'static,
1252 RustcOptGroup { name, apply: Box::new(f), stability: OptionStability::Unstable }
1256 // The `opt` local module holds wrappers around the `getopts` API that
1257 // adds extra rustc-specific metadata to each option; such metadata
1258 // is exposed by . The public
1259 // functions below ending with `_u` are the functions that return
1260 // *unstable* options, i.e., options that are only enabled when the
1261 // user also passes the `-Z unstable-options` debugging flag.
1263 // The `fn flag*` etc below are written so that we can use them
1264 // in the future; do not warn about them not being used right now.
1265 #![allow(dead_code)]
1267 use super::RustcOptGroup;
1269 pub type R = RustcOptGroup;
1270 pub type S = &'static str;
1272 fn stable<F>(name: S, f: F) -> R
1274 F: Fn(&mut getopts::Options) -> &mut getopts::Options + 'static,
1276 RustcOptGroup::stable(name, f)
1279 fn unstable<F>(name: S, f: F) -> R
1281 F: Fn(&mut getopts::Options) -> &mut getopts::Options + 'static,
1283 RustcOptGroup::unstable(name, f)
1286 fn longer(a: S, b: S) -> S {
1287 if a.len() > b.len() { a } else { b }
1290 pub fn opt_s(a: S, b: S, c: S, d: S) -> R {
1291 stable(longer(a, b), move |opts| opts.optopt(a, b, c, d))
1293 pub fn multi_s(a: S, b: S, c: S, d: S) -> R {
1294 stable(longer(a, b), move |opts| opts.optmulti(a, b, c, d))
1296 pub fn flag_s(a: S, b: S, c: S) -> R {
1297 stable(longer(a, b), move |opts| opts.optflag(a, b, c))
1299 pub fn flagmulti_s(a: S, b: S, c: S) -> R {
1300 stable(longer(a, b), move |opts| opts.optflagmulti(a, b, c))
1303 pub fn opt(a: S, b: S, c: S, d: S) -> R {
1304 unstable(longer(a, b), move |opts| opts.optopt(a, b, c, d))
1306 pub fn multi(a: S, b: S, c: S, d: S) -> R {
1307 unstable(longer(a, b), move |opts| opts.optmulti(a, b, c, d))
1311 /// Returns the "short" subset of the rustc command line options,
1312 /// including metadata for each option, such as whether the option is
1313 /// part of the stable long-term interface for rustc.
1314 pub fn rustc_short_optgroups() -> Vec<RustcOptGroup> {
1316 opt::flag_s("h", "help", "Display this message"),
1317 opt::multi_s("", "cfg", "Configure the compilation environment", "SPEC"),
1318 opt::multi("", "check-cfg", "Provide list of valid cfg options for checking", "SPEC"),
1322 "Add a directory to the library search path. The
1323 optional KIND can be one of dependency, crate, native,
1324 framework, or all (the default).",
1330 "Link the generated crate(s) to the specified native
1331 library NAME. The optional KIND can be one of
1332 static, framework, or dylib (the default).
1333 Optional comma separated MODIFIERS (bundle|verbatim|whole-archive|as-needed)
1334 may be specified each with a prefix of either '+' to
1335 enable or '-' to disable.",
1336 "[KIND[:MODIFIERS]=]NAME[:RENAME]",
1338 make_crate_type_option(),
1339 opt::opt_s("", "crate-name", "Specify the name of the crate being built", "NAME"),
1343 "Specify which edition of the compiler to use when compiling code.",
1349 "Comma separated list of types of output for \
1350 the compiler to emit",
1351 "[asm|llvm-bc|llvm-ir|obj|metadata|link|dep-info|mir]",
1356 "Compiler information to print on stdout",
1357 "[crate-name|file-names|sysroot|target-libdir|cfg|calling-conventions|\
1358 target-list|target-cpus|target-features|relocation-models|code-models|\
1359 tls-models|target-spec-json|native-static-libs|stack-protector-strategies|\
1362 opt::flagmulti_s("g", "", "Equivalent to -C debuginfo=2"),
1363 opt::flagmulti_s("O", "", "Equivalent to -C opt-level=2"),
1364 opt::opt_s("o", "", "Write output to <filename>", "FILENAME"),
1368 "Write output to compiler-chosen filename \
1375 "Provide a detailed explanation of an error \
1379 opt::flag_s("", "test", "Build a test harness"),
1380 opt::opt_s("", "target", "Target triple for which the code is compiled", "TARGET"),
1381 opt::multi_s("A", "allow", "Set lint allowed", "LINT"),
1382 opt::multi_s("W", "warn", "Set lint warnings", "LINT"),
1383 opt::multi_s("", "force-warn", "Set lint force-warn", "LINT"),
1384 opt::multi_s("D", "deny", "Set lint denied", "LINT"),
1385 opt::multi_s("F", "forbid", "Set lint forbidden", "LINT"),
1389 "Set the most restrictive lint level. \
1390 More restrictive lints are capped at this \
1394 opt::multi_s("C", "codegen", "Set a codegen option", "OPT[=VALUE]"),
1395 opt::flag_s("V", "version", "Print version info and exit"),
1396 opt::flag_s("v", "verbose", "Use verbose output"),
1400 /// Returns all rustc command line options, including metadata for
1401 /// each option, such as whether the option is part of the stable
1402 /// long-term interface for rustc.
1403 pub fn rustc_optgroups() -> Vec<RustcOptGroup> {
1404 let mut opts = rustc_short_optgroups();
1405 // FIXME: none of these descriptions are actually used
1410 "Specify where an external rust library is located",
1413 opt::opt_s("", "sysroot", "Override the system root", "PATH"),
1414 opt::multi("Z", "", "Set unstable / perma-unstable options", "FLAG"),
1418 "How errors and other messages are produced",
1421 opt::multi_s("", "json", "Configure the JSON output of the compiler", "CONFIG"),
1425 "Configure coloring of output:
1426 auto = colorize, if output goes to a tty (default);
1427 always = always colorize output;
1428 never = never colorize output",
1429 "auto|always|never",
1434 "Inform rustc of the width of the output so that diagnostics can be truncated to fit",
1439 "remap-path-prefix",
1440 "Remap source names in all output (compiler messages and output files)",
1447 pub fn get_cmd_lint_options(
1448 matches: &getopts::Matches,
1449 error_format: ErrorOutputType,
1450 ) -> (Vec<(String, lint::Level)>, bool, Option<lint::Level>) {
1451 let mut lint_opts_with_position = vec![];
1452 let mut describe_lints = false;
1454 for level in [lint::Allow, lint::Warn, lint::ForceWarn(None), lint::Deny, lint::Forbid] {
1455 for (arg_pos, lint_name) in matches.opt_strs_pos(level.as_str()) {
1456 if lint_name == "help" {
1457 describe_lints = true;
1459 lint_opts_with_position.push((arg_pos, lint_name.replace('-', "_"), level));
1464 lint_opts_with_position.sort_by_key(|x| x.0);
1465 let lint_opts = lint_opts_with_position
1468 .map(|(_, lint_name, level)| (lint_name, level))
1471 let lint_cap = matches.opt_str("cap-lints").map(|cap| {
1472 lint::Level::from_str(&cap)
1473 .unwrap_or_else(|| early_error(error_format, &format!("unknown lint level: `{cap}`")))
1476 (lint_opts, describe_lints, lint_cap)
1479 /// Parses the `--color` flag.
1480 pub fn parse_color(matches: &getopts::Matches) -> ColorConfig {
1481 match matches.opt_str("color").as_ref().map(|s| &s[..]) {
1482 Some("auto") => ColorConfig::Auto,
1483 Some("always") => ColorConfig::Always,
1484 Some("never") => ColorConfig::Never,
1486 None => ColorConfig::Auto,
1488 Some(arg) => early_error(
1489 ErrorOutputType::default(),
1491 "argument for `--color` must be auto, \
1492 always or never (instead was `{arg}`)"
1498 /// Possible json config files
1499 pub struct JsonConfig {
1500 pub json_rendered: HumanReadableErrorType,
1501 pub json_artifact_notifications: bool,
1502 pub json_unused_externs: JsonUnusedExterns,
1503 pub json_future_incompat: bool,
1506 /// Report unused externs in event stream
1507 #[derive(Copy, Clone)]
1508 pub enum JsonUnusedExterns {
1511 /// Report, but do not exit with failure status for deny/forbid
1513 /// Report, and also exit with failure status for deny/forbid
1517 impl JsonUnusedExterns {
1518 pub fn is_enabled(&self) -> bool {
1520 JsonUnusedExterns::No => false,
1521 JsonUnusedExterns::Loud | JsonUnusedExterns::Silent => true,
1525 pub fn is_loud(&self) -> bool {
1527 JsonUnusedExterns::No | JsonUnusedExterns::Silent => false,
1528 JsonUnusedExterns::Loud => true,
1533 /// Parse the `--json` flag.
1535 /// The first value returned is how to render JSON diagnostics, and the second
1536 /// is whether or not artifact notifications are enabled.
1537 pub fn parse_json(matches: &getopts::Matches) -> JsonConfig {
1538 let mut json_rendered: fn(ColorConfig) -> HumanReadableErrorType =
1539 HumanReadableErrorType::Default;
1540 let mut json_color = ColorConfig::Never;
1541 let mut json_artifact_notifications = false;
1542 let mut json_unused_externs = JsonUnusedExterns::No;
1543 let mut json_future_incompat = false;
1544 for option in matches.opt_strs("json") {
1545 // For now conservatively forbid `--color` with `--json` since `--json`
1546 // won't actually be emitting any colors and anything colorized is
1547 // embedded in a diagnostic message anyway.
1548 if matches.opt_str("color").is_some() {
1550 ErrorOutputType::default(),
1551 "cannot specify the `--color` option with `--json`",
1555 for sub_option in option.split(',') {
1557 "diagnostic-short" => json_rendered = HumanReadableErrorType::Short,
1558 "diagnostic-rendered-ansi" => json_color = ColorConfig::Always,
1559 "artifacts" => json_artifact_notifications = true,
1560 "unused-externs" => json_unused_externs = JsonUnusedExterns::Loud,
1561 "unused-externs-silent" => json_unused_externs = JsonUnusedExterns::Silent,
1562 "future-incompat" => json_future_incompat = true,
1564 ErrorOutputType::default(),
1565 &format!("unknown `--json` option `{s}`"),
1572 json_rendered: json_rendered(json_color),
1573 json_artifact_notifications,
1574 json_unused_externs,
1575 json_future_incompat,
1579 /// Parses the `--error-format` flag.
1580 pub fn parse_error_format(
1581 matches: &getopts::Matches,
1583 json_rendered: HumanReadableErrorType,
1584 ) -> ErrorOutputType {
1585 // We need the `opts_present` check because the driver will send us Matches
1586 // with only stable options if no unstable options are used. Since error-format
1587 // is unstable, it will not be present. We have to use `opts_present` not
1588 // `opt_present` because the latter will panic.
1589 let error_format = if matches.opts_present(&["error-format".to_owned()]) {
1590 match matches.opt_str("error-format").as_ref().map(|s| &s[..]) {
1591 None | Some("human") => {
1592 ErrorOutputType::HumanReadable(HumanReadableErrorType::Default(color))
1594 Some("human-annotate-rs") => {
1595 ErrorOutputType::HumanReadable(HumanReadableErrorType::AnnotateSnippet(color))
1597 Some("json") => ErrorOutputType::Json { pretty: false, json_rendered },
1598 Some("pretty-json") => ErrorOutputType::Json { pretty: true, json_rendered },
1599 Some("short") => ErrorOutputType::HumanReadable(HumanReadableErrorType::Short(color)),
1601 Some(arg) => early_error(
1602 ErrorOutputType::HumanReadable(HumanReadableErrorType::Default(color)),
1604 "argument for `--error-format` must be `human`, `json` or \
1605 `short` (instead was `{arg}`)"
1610 ErrorOutputType::HumanReadable(HumanReadableErrorType::Default(color))
1613 match error_format {
1614 ErrorOutputType::Json { .. } => {}
1616 // Conservatively require that the `--json` argument is coupled with
1617 // `--error-format=json`. This means that `--json` is specified we
1618 // should actually be emitting JSON blobs.
1619 _ if !matches.opt_strs("json").is_empty() => {
1621 ErrorOutputType::default(),
1622 "using `--json` requires also using `--error-format=json`",
1632 pub fn parse_crate_edition(matches: &getopts::Matches) -> Edition {
1633 let edition = match matches.opt_str("edition") {
1634 Some(arg) => Edition::from_str(&arg).unwrap_or_else(|_| {
1636 ErrorOutputType::default(),
1638 "argument for `--edition` must be one of: \
1639 {EDITION_NAME_LIST}. (instead was `{arg}`)"
1643 None => DEFAULT_EDITION,
1646 if !edition.is_stable() && !nightly_options::is_unstable_enabled(matches) {
1647 let is_nightly = nightly_options::match_is_nightly_build(matches);
1648 let msg = if !is_nightly {
1650 "the crate requires edition {}, but the latest edition supported by this Rust version is {}",
1651 edition, LATEST_STABLE_EDITION
1654 format!("edition {edition} is unstable and only available with -Z unstable-options")
1656 early_error(ErrorOutputType::default(), &msg)
1662 fn check_error_format_stability(
1663 unstable_opts: &UnstableOptions,
1664 error_format: ErrorOutputType,
1665 json_rendered: HumanReadableErrorType,
1667 if !unstable_opts.unstable_options {
1668 if let ErrorOutputType::Json { pretty: true, json_rendered } = error_format {
1670 ErrorOutputType::Json { pretty: false, json_rendered },
1671 "`--error-format=pretty-json` is unstable",
1674 if let ErrorOutputType::HumanReadable(HumanReadableErrorType::AnnotateSnippet(_)) =
1678 ErrorOutputType::Json { pretty: false, json_rendered },
1679 "`--error-format=human-annotate-rs` is unstable",
1685 fn parse_output_types(
1686 unstable_opts: &UnstableOptions,
1687 matches: &getopts::Matches,
1688 error_format: ErrorOutputType,
1690 let mut output_types = BTreeMap::new();
1691 if !unstable_opts.parse_only {
1692 for list in matches.opt_strs("emit") {
1693 for output_type in list.split(',') {
1694 let (shorthand, path) = match output_type.split_once('=') {
1695 None => (output_type, None),
1696 Some((shorthand, path)) => (shorthand, Some(PathBuf::from(path))),
1698 let output_type = OutputType::from_shorthand(shorthand).unwrap_or_else(|| {
1702 "unknown emission type: `{shorthand}` - expected one of: {display}",
1703 display = OutputType::shorthands_display(),
1707 output_types.insert(output_type, path);
1711 if output_types.is_empty() {
1712 output_types.insert(OutputType::Exe, None);
1714 OutputTypes(output_types)
1717 fn should_override_cgus_and_disable_thinlto(
1718 output_types: &OutputTypes,
1719 matches: &getopts::Matches,
1720 error_format: ErrorOutputType,
1721 mut codegen_units: Option<usize>,
1722 ) -> (bool, Option<usize>) {
1723 let mut disable_thinlto = false;
1724 // Issue #30063: if user requests LLVM-related output to one
1725 // particular path, disable codegen-units.
1726 let incompatible: Vec<_> = output_types
1729 .map(|ot_path| ot_path.0)
1730 .filter(|ot| !ot.is_compatible_with_codegen_units_and_single_output_file())
1731 .map(|ot| ot.shorthand())
1733 if !incompatible.is_empty() {
1734 match codegen_units {
1735 Some(n) if n > 1 => {
1736 if matches.opt_present("o") {
1737 for ot in &incompatible {
1741 "`--emit={ot}` with `-o` incompatible with \
1742 `-C codegen-units=N` for N > 1",
1746 early_warn(error_format, "resetting to default -C codegen-units=1");
1747 codegen_units = Some(1);
1748 disable_thinlto = true;
1752 codegen_units = Some(1);
1753 disable_thinlto = true;
1758 if codegen_units == Some(0) {
1759 early_error(error_format, "value for codegen units must be a positive non-zero integer");
1762 (disable_thinlto, codegen_units)
1765 fn check_thread_count(unstable_opts: &UnstableOptions, error_format: ErrorOutputType) {
1766 if unstable_opts.threads == 0 {
1767 early_error(error_format, "value for threads must be a positive non-zero integer");
1770 if unstable_opts.threads > 1 && unstable_opts.fuel.is_some() {
1771 early_error(error_format, "optimization fuel is incompatible with multiple threads");
1775 fn collect_print_requests(
1776 cg: &mut CodegenOptions,
1777 unstable_opts: &mut UnstableOptions,
1778 matches: &getopts::Matches,
1779 error_format: ErrorOutputType,
1780 ) -> Vec<PrintRequest> {
1781 let mut prints = Vec::<PrintRequest>::new();
1782 if cg.target_cpu.as_ref().map_or(false, |s| s == "help") {
1783 prints.push(PrintRequest::TargetCPUs);
1784 cg.target_cpu = None;
1786 if cg.target_feature == "help" {
1787 prints.push(PrintRequest::TargetFeatures);
1788 cg.target_feature = String::new();
1791 prints.extend(matches.opt_strs("print").into_iter().map(|s| match &*s {
1792 "crate-name" => PrintRequest::CrateName,
1793 "file-names" => PrintRequest::FileNames,
1794 "sysroot" => PrintRequest::Sysroot,
1795 "target-libdir" => PrintRequest::TargetLibdir,
1796 "cfg" => PrintRequest::Cfg,
1797 "calling-conventions" => PrintRequest::CallingConventions,
1798 "target-list" => PrintRequest::TargetList,
1799 "target-cpus" => PrintRequest::TargetCPUs,
1800 "target-features" => PrintRequest::TargetFeatures,
1801 "relocation-models" => PrintRequest::RelocationModels,
1802 "code-models" => PrintRequest::CodeModels,
1803 "tls-models" => PrintRequest::TlsModels,
1804 "native-static-libs" => PrintRequest::NativeStaticLibs,
1805 "stack-protector-strategies" => PrintRequest::StackProtectorStrategies,
1806 "target-spec-json" => {
1807 if unstable_opts.unstable_options {
1808 PrintRequest::TargetSpec
1812 "the `-Z unstable-options` flag must also be passed to \
1813 enable the target-spec-json print option",
1817 "link-args" => PrintRequest::LinkArgs,
1818 req => early_error(error_format, &format!("unknown print request `{req}`")),
1824 pub fn parse_target_triple(
1825 matches: &getopts::Matches,
1826 error_format: ErrorOutputType,
1828 match matches.opt_str("target") {
1829 Some(target) if target.ends_with(".json") => {
1830 let path = Path::new(&target);
1831 TargetTriple::from_path(&path).unwrap_or_else(|_| {
1832 early_error(error_format, &format!("target file {path:?} does not exist"))
1835 Some(target) => TargetTriple::TargetTriple(target),
1836 _ => TargetTriple::from_triple(host_triple()),
1841 matches: &getopts::Matches,
1842 cg: &CodegenOptions,
1843 error_format: ErrorOutputType,
1845 // The `-O` and `-C opt-level` flags specify the same setting, so we want to be able
1846 // to use them interchangeably. However, because they're technically different flags,
1847 // we need to work out manually which should take precedence if both are supplied (i.e.
1848 // the rightmost flag). We do this by finding the (rightmost) position of both flags and
1849 // comparing them. Note that if a flag is not found, its position will be `None`, which
1850 // always compared less than `Some(_)`.
1851 let max_o = matches.opt_positions("O").into_iter().max();
1855 .flat_map(|(i, s)| {
1856 // NB: This can match a string without `=`.
1857 if let Some("opt-level") = s.splitn(2, '=').next() { Some(i) } else { None }
1863 match cg.opt_level.as_ref() {
1864 "0" => OptLevel::No,
1865 "1" => OptLevel::Less,
1866 "2" => OptLevel::Default,
1867 "3" => OptLevel::Aggressive,
1868 "s" => OptLevel::Size,
1869 "z" => OptLevel::SizeMin,
1874 "optimization level needs to be \
1875 between 0-3, s or z (instead was `{arg}`)"
1883 fn select_debuginfo(
1884 matches: &getopts::Matches,
1885 cg: &CodegenOptions,
1886 error_format: ErrorOutputType,
1888 let max_g = matches.opt_positions("g").into_iter().max();
1892 .flat_map(|(i, s)| {
1893 // NB: This can match a string without `=`.
1894 if let Some("debuginfo") = s.splitn(2, '=').next() { Some(i) } else { None }
1900 match cg.debuginfo {
1901 0 => DebugInfo::None,
1902 1 => DebugInfo::Limited,
1903 2 => DebugInfo::Full,
1908 "debug info level needs to be between \
1909 0-2 (instead was `{arg}`)"
1917 pub(crate) fn parse_assert_incr_state(
1918 opt_assertion: &Option<String>,
1919 error_format: ErrorOutputType,
1920 ) -> Option<IncrementalStateAssertion> {
1921 match opt_assertion {
1922 Some(s) if s.as_str() == "loaded" => Some(IncrementalStateAssertion::Loaded),
1923 Some(s) if s.as_str() == "not-loaded" => Some(IncrementalStateAssertion::NotLoaded),
1925 early_error(error_format, &format!("unexpected incremental state assertion value: {s}"))
1931 fn parse_native_lib_kind(
1932 matches: &getopts::Matches,
1934 error_format: ErrorOutputType,
1935 ) -> (NativeLibKind, Option<bool>) {
1936 let (kind, modifiers) = match kind.split_once(':') {
1937 None => (kind, None),
1938 Some((kind, modifiers)) => (kind, Some(modifiers)),
1941 let kind = match kind {
1942 "static" => NativeLibKind::Static { bundle: None, whole_archive: None },
1943 "dylib" => NativeLibKind::Dylib { as_needed: None },
1944 "framework" => NativeLibKind::Framework { as_needed: None },
1946 if !nightly_options::is_unstable_enabled(matches) {
1947 let why = if nightly_options::match_is_nightly_build(matches) {
1948 " and only accepted on the nightly compiler"
1950 ", the `-Z unstable-options` flag must also be passed to use it"
1952 early_error(error_format, &format!("library kind `link-arg` is unstable{why}"))
1954 NativeLibKind::LinkArg
1959 "unknown library kind `{kind}`, expected one of: static, dylib, framework, link-arg"
1964 None => (kind, None),
1965 Some(modifiers) => parse_native_lib_modifiers(kind, modifiers, error_format, matches),
1969 fn parse_native_lib_modifiers(
1970 mut kind: NativeLibKind,
1972 error_format: ErrorOutputType,
1973 matches: &getopts::Matches,
1974 ) -> (NativeLibKind, Option<bool>) {
1975 let mut verbatim = None;
1976 for modifier in modifiers.split(',') {
1977 let (modifier, value) = match modifier.strip_prefix(&['+', '-']) {
1978 Some(m) => (m, modifier.starts_with('+')),
1979 None => early_error(
1981 "invalid linking modifier syntax, expected '+' or '-' prefix \
1982 before one of: bundle, verbatim, whole-archive, as-needed",
1986 let report_unstable_modifier = || {
1987 if !nightly_options::is_unstable_enabled(matches) {
1988 let why = if nightly_options::match_is_nightly_build(matches) {
1989 " and only accepted on the nightly compiler"
1991 ", the `-Z unstable-options` flag must also be passed to use it"
1995 &format!("linking modifier `{modifier}` is unstable{why}"),
1999 let assign_modifier = |dst: &mut Option<bool>| {
2001 let msg = format!("multiple `{modifier}` modifiers in a single `-l` option");
2002 early_error(error_format, &msg)
2007 match (modifier, &mut kind) {
2008 ("bundle", NativeLibKind::Static { bundle, .. }) => assign_modifier(bundle),
2009 ("bundle", _) => early_error(
2011 "linking modifier `bundle` is only compatible with `static` linking kind",
2014 ("verbatim", _) => {
2015 report_unstable_modifier();
2016 assign_modifier(&mut verbatim)
2019 ("whole-archive", NativeLibKind::Static { whole_archive, .. }) => {
2020 assign_modifier(whole_archive)
2022 ("whole-archive", _) => early_error(
2024 "linking modifier `whole-archive` is only compatible with `static` linking kind",
2027 ("as-needed", NativeLibKind::Dylib { as_needed })
2028 | ("as-needed", NativeLibKind::Framework { as_needed }) => {
2029 report_unstable_modifier();
2030 assign_modifier(as_needed)
2032 ("as-needed", _) => early_error(
2034 "linking modifier `as-needed` is only compatible with \
2035 `dylib` and `framework` linking kinds",
2038 // Note: this error also excludes the case with empty modifier
2039 // string, like `modifiers = ""`.
2043 "unknown linking modifier `{modifier}`, expected one \
2044 of: bundle, verbatim, whole-archive, as-needed"
2053 fn parse_libs(matches: &getopts::Matches, error_format: ErrorOutputType) -> Vec<NativeLib> {
2058 // Parse string of the form "[KIND[:MODIFIERS]=]lib[:new_name]",
2059 // where KIND is one of "dylib", "framework", "static", "link-arg" and
2060 // where MODIFIERS are a comma separated list of supported modifiers
2061 // (bundle, verbatim, whole-archive, as-needed). Each modifier is prefixed
2062 // with either + or - to indicate whether it is enabled or disabled.
2063 // The last value specified for a given modifier wins.
2064 let (name, kind, verbatim) = match s.split_once('=') {
2065 None => (s, NativeLibKind::Unspecified, None),
2066 Some((kind, name)) => {
2067 let (kind, verbatim) = parse_native_lib_kind(matches, kind, error_format);
2068 (name.to_string(), kind, verbatim)
2072 let (name, new_name) = match name.split_once(':') {
2073 None => (name, None),
2074 Some((name, new_name)) => (name.to_string(), Some(new_name.to_owned())),
2076 if name.is_empty() {
2077 early_error(error_format, "library name must not be empty");
2079 NativeLib { name, new_name, kind, verbatim }
2084 pub fn parse_externs(
2085 matches: &getopts::Matches,
2086 unstable_opts: &UnstableOptions,
2087 error_format: ErrorOutputType,
2089 let is_unstable_enabled = unstable_opts.unstable_options;
2090 let mut externs: BTreeMap<String, ExternEntry> = BTreeMap::new();
2091 for arg in matches.opt_strs("extern") {
2092 let (name, path) = match arg.split_once('=') {
2093 None => (arg, None),
2094 Some((name, path)) => (name.to_string(), Some(Path::new(path))),
2096 let (options, name) = match name.split_once(':') {
2097 None => (None, name),
2098 Some((opts, name)) => (Some(opts), name.to_string()),
2101 let path = path.map(|p| CanonicalizedPath::new(p));
2103 let entry = externs.entry(name.to_owned());
2105 use std::collections::btree_map::Entry;
2107 let entry = if let Some(path) = path {
2108 // --extern prelude_name=some_file.rlib
2110 Entry::Vacant(vacant) => {
2111 let files = BTreeSet::from_iter(iter::once(path));
2112 vacant.insert(ExternEntry::new(ExternLocation::ExactPaths(files)))
2114 Entry::Occupied(occupied) => {
2115 let ext_ent = occupied.into_mut();
2117 ExternEntry { location: ExternLocation::ExactPaths(files), .. } => {
2121 location: location @ ExternLocation::FoundInLibrarySearchDirectories,
2124 // Exact paths take precedence over search directories.
2125 let files = BTreeSet::from_iter(iter::once(path));
2126 *location = ExternLocation::ExactPaths(files);
2133 // --extern prelude_name
2135 Entry::Vacant(vacant) => {
2136 vacant.insert(ExternEntry::new(ExternLocation::FoundInLibrarySearchDirectories))
2138 Entry::Occupied(occupied) => {
2139 // Ignore if already specified.
2145 let mut is_private_dep = false;
2146 let mut add_prelude = true;
2147 let mut nounused_dep = false;
2148 if let Some(opts) = options {
2149 if !is_unstable_enabled {
2152 "the `-Z unstable-options` flag must also be passed to \
2153 enable `--extern options",
2156 for opt in opts.split(',') {
2158 "priv" => is_private_dep = true,
2160 if let ExternLocation::ExactPaths(_) = &entry.location {
2161 add_prelude = false;
2165 "the `noprelude` --extern option requires a file path",
2169 "nounused" => nounused_dep = true,
2170 _ => early_error(error_format, &format!("unknown --extern option `{opt}`")),
2175 // Crates start out being not private, and go to being private `priv`
2177 entry.is_private_dep |= is_private_dep;
2178 // likewise `nounused`
2179 entry.nounused_dep |= nounused_dep;
2180 // If any flag is missing `noprelude`, then add to the prelude.
2181 entry.add_prelude |= add_prelude;
2186 fn parse_remap_path_prefix(
2187 matches: &getopts::Matches,
2188 unstable_opts: &UnstableOptions,
2189 error_format: ErrorOutputType,
2190 ) -> Vec<(PathBuf, PathBuf)> {
2191 let mut mapping: Vec<(PathBuf, PathBuf)> = matches
2192 .opt_strs("remap-path-prefix")
2194 .map(|remap| match remap.rsplit_once('=') {
2195 None => early_error(
2197 "--remap-path-prefix must contain '=' between FROM and TO",
2199 Some((from, to)) => (PathBuf::from(from), PathBuf::from(to)),
2202 match &unstable_opts.remap_cwd_prefix {
2203 Some(to) => match std::env::current_dir() {
2204 Ok(cwd) => mapping.push((cwd, to.clone())),
2212 // JUSTIFICATION: before wrapper fn is available
2213 #[allow(rustc::bad_opt_access)]
2214 pub fn build_session_options(matches: &getopts::Matches) -> Options {
2215 let color = parse_color(matches);
2217 let edition = parse_crate_edition(matches);
2221 json_artifact_notifications,
2222 json_unused_externs,
2223 json_future_incompat,
2224 } = parse_json(matches);
2226 let error_format = parse_error_format(matches, color, json_rendered);
2228 let diagnostic_width = matches.opt_get("diagnostic-width").unwrap_or_else(|_| {
2229 early_error(error_format, "`--diagnostic-width` must be an positive integer");
2232 let unparsed_crate_types = matches.opt_strs("crate-type");
2233 let crate_types = parse_crate_types_from_list(unparsed_crate_types)
2234 .unwrap_or_else(|e| early_error(error_format, &e));
2236 let mut unstable_opts = UnstableOptions::build(matches, error_format);
2237 let (lint_opts, describe_lints, lint_cap) = get_cmd_lint_options(matches, error_format);
2239 check_error_format_stability(&unstable_opts, error_format, json_rendered);
2241 if !unstable_opts.unstable_options && json_unused_externs.is_enabled() {
2244 "the `-Z unstable-options` flag must also be passed to enable \
2245 the flag `--json=unused-externs`",
2249 let output_types = parse_output_types(&unstable_opts, matches, error_format);
2251 let mut cg = CodegenOptions::build(matches, error_format);
2252 let (disable_thinlto, mut codegen_units) = should_override_cgus_and_disable_thinlto(
2259 check_thread_count(&unstable_opts, error_format);
2261 let incremental = cg.incremental.as_ref().map(PathBuf::from);
2263 let assert_incr_state = parse_assert_incr_state(&unstable_opts.assert_incr_state, error_format);
2265 if unstable_opts.profile && incremental.is_some() {
2268 "can't instrument with gcov profiling when compiling incrementally",
2271 if unstable_opts.profile {
2272 match codegen_units {
2274 None => codegen_units = Some(1),
2275 Some(_) => early_error(
2277 "can't instrument with gcov profiling with multiple codegen units",
2282 if cg.profile_generate.enabled() && cg.profile_use.is_some() {
2285 "options `-C profile-generate` and `-C profile-use` are exclusive",
2289 if unstable_opts.profile_sample_use.is_some()
2290 && (cg.profile_generate.enabled() || cg.profile_use.is_some())
2294 "option `-Z profile-sample-use` cannot be used with `-C profile-generate` or `-C profile-use`",
2298 // Handle both `-Z symbol-mangling-version` and `-C symbol-mangling-version`; the latter takes
2300 match (cg.symbol_mangling_version, unstable_opts.symbol_mangling_version) {
2301 (Some(smv_c), Some(smv_z)) if smv_c != smv_z => {
2304 "incompatible values passed for `-C symbol-mangling-version` \
2305 and `-Z symbol-mangling-version`",
2308 (Some(SymbolManglingVersion::V0), _) => {}
2309 (Some(_), _) if !unstable_opts.unstable_options => {
2312 "`-C symbol-mangling-version=legacy` requires `-Z unstable-options`",
2319 "`-Z symbol-mangling-version` is deprecated; use `-C symbol-mangling-version`",
2321 cg.symbol_mangling_version = smv;
2326 // Handle both `-Z instrument-coverage` and `-C instrument-coverage`; the latter takes
2328 match (cg.instrument_coverage, unstable_opts.instrument_coverage) {
2329 (Some(ic_c), Some(ic_z)) if ic_c != ic_z => {
2332 "incompatible values passed for `-C instrument-coverage` \
2333 and `-Z instrument-coverage`",
2336 (Some(InstrumentCoverage::Off | InstrumentCoverage::All), _) => {}
2337 (Some(_), _) if !unstable_opts.unstable_options => {
2340 "`-C instrument-coverage=except-*` requires `-Z unstable-options`",
2347 "`-Z instrument-coverage` is deprecated; use `-C instrument-coverage`",
2349 cg.instrument_coverage = ic;
2354 if cg.instrument_coverage.is_some() && cg.instrument_coverage != Some(InstrumentCoverage::Off) {
2355 if cg.profile_generate.enabled() || cg.profile_use.is_some() {
2358 "option `-C instrument-coverage` is not compatible with either `-C profile-use` \
2359 or `-C profile-generate`",
2363 // `-C instrument-coverage` implies `-C symbol-mangling-version=v0` - to ensure consistent
2364 // and reversible name mangling. Note, LLVM coverage tools can analyze coverage over
2365 // multiple runs, including some changes to source code; so mangled names must be consistent
2366 // across compilations.
2367 match cg.symbol_mangling_version {
2368 None => cg.symbol_mangling_version = Some(SymbolManglingVersion::V0),
2369 Some(SymbolManglingVersion::Legacy) => {
2372 "-C instrument-coverage requires symbol mangling version `v0`, \
2373 but `-C symbol-mangling-version=legacy` was specified",
2376 Some(SymbolManglingVersion::V0) => {}
2380 if let Ok(graphviz_font) = std::env::var("RUSTC_GRAPHVIZ_FONT") {
2381 unstable_opts.graphviz_font = graphviz_font;
2384 if !cg.embed_bitcode {
2386 LtoCli::No | LtoCli::Unspecified => {}
2387 LtoCli::Yes | LtoCli::NoParam | LtoCli::Thin | LtoCli::Fat => early_error(
2389 "options `-C embed-bitcode=no` and `-C lto` are incompatible",
2394 let prints = collect_print_requests(&mut cg, &mut unstable_opts, matches, error_format);
2398 let sysroot_opt = matches.opt_str("sysroot").map(|m| PathBuf::from(&m));
2399 let target_triple = parse_target_triple(matches, error_format);
2400 let opt_level = parse_opt_level(matches, &cg, error_format);
2401 // The `-g` and `-C debuginfo` flags specify the same setting, so we want to be able
2402 // to use them interchangeably. See the note above (regarding `-O` and `-C opt-level`)
2403 // for more details.
2404 let debug_assertions = cg.debug_assertions.unwrap_or(opt_level == OptLevel::No);
2405 let debuginfo = select_debuginfo(matches, &cg, error_format);
2407 let mut search_paths = vec![];
2408 for s in &matches.opt_strs("L") {
2409 search_paths.push(SearchPath::from_cli_opt(&s, error_format));
2412 let libs = parse_libs(matches, error_format);
2414 let test = matches.opt_present("test");
2416 if !cg.remark.is_empty() && debuginfo == DebugInfo::None {
2417 early_warn(error_format, "-C remark requires \"-C debuginfo=n\" to show source locations");
2420 let externs = parse_externs(matches, &unstable_opts, error_format);
2422 let crate_name = matches.opt_str("crate-name");
2424 let remap_path_prefix = parse_remap_path_prefix(matches, &unstable_opts, error_format);
2426 let pretty = parse_pretty(&unstable_opts, error_format);
2428 // Try to find a directory containing the Rust `src`, for more details see
2429 // the doc comment on the `real_rust_source_base_dir` field.
2431 let sysroot = match &sysroot_opt {
2434 tmp_buf = crate::filesearch::get_or_default_sysroot();
2438 let real_rust_source_base_dir = {
2439 // This is the location used by the `rust-src` `rustup` component.
2440 let mut candidate = sysroot.join("lib/rustlib/src/rust");
2441 if let Ok(metadata) = candidate.symlink_metadata() {
2442 // Replace the symlink rustbuild creates, with its destination.
2443 // We could try to use `fs::canonicalize` instead, but that might
2444 // produce unnecessarily verbose path.
2445 if metadata.file_type().is_symlink() {
2446 if let Ok(symlink_dest) = std::fs::read_link(&candidate) {
2447 candidate = symlink_dest;
2452 // Only use this directory if it has a file we can expect to always find.
2453 if candidate.join("library/std/src/lib.rs").is_file() { Some(candidate) } else { None }
2456 let working_dir = std::env::current_dir().unwrap_or_else(|e| {
2457 early_error(error_format, &format!("Current directory is invalid: {e}"));
2460 let (path, remapped) =
2461 FilePathMapping::new(remap_path_prefix.clone()).map_prefix(working_dir.clone());
2462 let working_dir = if remapped {
2463 RealFileName::Remapped { local_path: Some(working_dir), virtual_name: path }
2465 RealFileName::LocalPath(path)
2471 optimize: opt_level,
2478 maybe_sysroot: sysroot_opt,
2488 unstable_features: UnstableFeatures::from_environment(crate_name.as_deref()),
2492 actually_rustdoc: false,
2493 trimmed_def_paths: TrimmedDefPaths::default(),
2494 cli_forced_codegen_units: codegen_units,
2495 cli_forced_thinlto_off: disable_thinlto,
2497 real_rust_source_base_dir,
2499 json_artifact_notifications,
2500 json_unused_externs,
2501 json_future_incompat,
2507 fn parse_pretty(unstable_opts: &UnstableOptions, efmt: ErrorOutputType) -> Option<PpMode> {
2510 let first = match unstable_opts.unpretty.as_deref()? {
2511 "normal" => Source(PpSourceMode::Normal),
2512 "identified" => Source(PpSourceMode::Identified),
2513 "expanded" => Source(PpSourceMode::Expanded),
2514 "expanded,identified" => Source(PpSourceMode::ExpandedIdentified),
2515 "expanded,hygiene" => Source(PpSourceMode::ExpandedHygiene),
2516 "ast-tree" => AstTree(PpAstTreeMode::Normal),
2517 "ast-tree,expanded" => AstTree(PpAstTreeMode::Expanded),
2518 "hir" => Hir(PpHirMode::Normal),
2519 "hir,identified" => Hir(PpHirMode::Identified),
2520 "hir,typed" => Hir(PpHirMode::Typed),
2521 "hir-tree" => HirTree,
2522 "thir-tree" => ThirTree,
2524 "mir-cfg" => MirCFG,
2525 name => early_error(
2528 "argument to `unpretty` must be one of `normal`, `identified`, \
2529 `expanded`, `expanded,identified`, `expanded,hygiene`, \
2530 `ast-tree`, `ast-tree,expanded`, `hir`, `hir,identified`, \
2531 `hir,typed`, `hir-tree`, `thir-tree`, `mir` or `mir-cfg`; got {name}"
2535 debug!("got unpretty option: {first:?}");
2539 pub fn make_crate_type_option() -> RustcOptGroup {
2543 "Comma separated list of types of crates
2544 for the compiler to emit",
2545 "[bin|lib|rlib|dylib|cdylib|staticlib|proc-macro]",
2549 pub fn parse_crate_types_from_list(list_list: Vec<String>) -> Result<Vec<CrateType>, String> {
2550 let mut crate_types: Vec<CrateType> = Vec::new();
2551 for unparsed_crate_type in &list_list {
2552 for part in unparsed_crate_type.split(',') {
2553 let new_part = match part {
2554 "lib" => default_lib_output(),
2555 "rlib" => CrateType::Rlib,
2556 "staticlib" => CrateType::Staticlib,
2557 "dylib" => CrateType::Dylib,
2558 "cdylib" => CrateType::Cdylib,
2559 "bin" => CrateType::Executable,
2560 "proc-macro" => CrateType::ProcMacro,
2561 _ => return Err(format!("unknown crate type: `{part}`")),
2563 if !crate_types.contains(&new_part) {
2564 crate_types.push(new_part)
2572 pub mod nightly_options {
2573 use super::{ErrorOutputType, OptionStability, RustcOptGroup};
2574 use crate::early_error;
2575 use rustc_feature::UnstableFeatures;
2577 pub fn is_unstable_enabled(matches: &getopts::Matches) -> bool {
2578 match_is_nightly_build(matches)
2579 && matches.opt_strs("Z").iter().any(|x| *x == "unstable-options")
2582 pub fn match_is_nightly_build(matches: &getopts::Matches) -> bool {
2583 is_nightly_build(matches.opt_str("crate-name").as_deref())
2586 pub fn is_nightly_build(krate: Option<&str>) -> bool {
2587 UnstableFeatures::from_environment(krate).is_nightly_build()
2590 pub fn check_nightly_options(matches: &getopts::Matches, flags: &[RustcOptGroup]) {
2591 let has_z_unstable_option = matches.opt_strs("Z").iter().any(|x| *x == "unstable-options");
2592 let really_allows_unstable_options = match_is_nightly_build(matches);
2594 for opt in flags.iter() {
2595 if opt.stability == OptionStability::Stable {
2598 if !matches.opt_present(opt.name) {
2601 if opt.name != "Z" && !has_z_unstable_option {
2603 ErrorOutputType::default(),
2605 "the `-Z unstable-options` flag must also be passed to enable \
2611 if really_allows_unstable_options {
2614 match opt.stability {
2615 OptionStability::Unstable => {
2617 "the option `{}` is only accepted on the \
2621 early_error(ErrorOutputType::default(), &msg);
2623 OptionStability::Stable => {}
2629 impl fmt::Display for CrateType {
2630 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2632 CrateType::Executable => "bin".fmt(f),
2633 CrateType::Dylib => "dylib".fmt(f),
2634 CrateType::Rlib => "rlib".fmt(f),
2635 CrateType::Staticlib => "staticlib".fmt(f),
2636 CrateType::Cdylib => "cdylib".fmt(f),
2637 CrateType::ProcMacro => "proc-macro".fmt(f),
2642 #[derive(Copy, Clone, PartialEq, Debug)]
2643 pub enum PpSourceMode {
2644 /// `-Zunpretty=normal`
2646 /// `-Zunpretty=expanded`
2648 /// `-Zunpretty=identified`
2650 /// `-Zunpretty=expanded,identified`
2652 /// `-Zunpretty=expanded,hygiene`
2656 #[derive(Copy, Clone, PartialEq, Debug)]
2657 pub enum PpAstTreeMode {
2658 /// `-Zunpretty=ast`
2660 /// `-Zunpretty=ast,expanded`
2664 #[derive(Copy, Clone, PartialEq, Debug)]
2665 pub enum PpHirMode {
2666 /// `-Zunpretty=hir`
2668 /// `-Zunpretty=hir,identified`
2670 /// `-Zunpretty=hir,typed`
2674 #[derive(Copy, Clone, PartialEq, Debug)]
2676 /// Options that print the source code, i.e.
2677 /// `-Zunpretty=normal` and `-Zunpretty=expanded`
2678 Source(PpSourceMode),
2679 AstTree(PpAstTreeMode),
2680 /// Options that print the HIR, i.e. `-Zunpretty=hir`
2682 /// `-Zunpretty=hir-tree`
2684 /// `-Zunpretty=thir-tree`
2686 /// `-Zunpretty=mir`
2688 /// `-Zunpretty=mir-cfg`
2693 pub fn needs_ast_map(&self) -> bool {
2695 use PpSourceMode::*;
2697 Source(Normal | Identified) | AstTree(PpAstTreeMode::Normal) => false,
2699 Source(Expanded | ExpandedIdentified | ExpandedHygiene)
2700 | AstTree(PpAstTreeMode::Expanded)
2708 pub fn needs_hir(&self) -> bool {
2711 Source(_) | AstTree(_) => false,
2713 Hir(_) | HirTree | ThirTree | Mir | MirCFG => true,
2717 pub fn needs_analysis(&self) -> bool {
2719 matches!(*self, Mir | MirCFG | ThirTree)
2723 /// Command-line arguments passed to the compiler have to be incorporated with
2724 /// the dependency tracking system for incremental compilation. This module
2725 /// provides some utilities to make this more convenient.
2727 /// The values of all command-line arguments that are relevant for dependency
2728 /// tracking are hashed into a single value that determines whether the
2729 /// incremental compilation cache can be re-used or not. This hashing is done
2730 /// via the `DepTrackingHash` trait defined below, since the standard `Hash`
2731 /// implementation might not be suitable (e.g., arguments are stored in a `Vec`,
2732 /// the hash of which is order dependent, but we might not want the order of
2733 /// arguments to make a difference for the hash).
2735 /// However, since the value provided by `Hash::hash` often *is* suitable,
2736 /// especially for primitive types, there is the
2737 /// `impl_dep_tracking_hash_via_hash!()` macro that allows to simply reuse the
2738 /// `Hash` implementation for `DepTrackingHash`. It's important though that
2739 /// we have an opt-in scheme here, so one is hopefully forced to think about
2740 /// how the hash should be calculated when adding a new command-line argument.
2741 pub(crate) mod dep_tracking {
2743 BranchProtection, CFGuard, CFProtection, CrateType, DebugInfo, ErrorOutputType,
2744 InstrumentCoverage, LdImpl, LinkerPluginLto, LocationDetail, LtoCli, OomStrategy, OptLevel,
2745 OutputType, OutputTypes, Passes, SourceFileHashAlgorithm, SplitDwarfKind,
2746 SwitchWithOptPath, SymbolManglingVersion, TrimmedDefPaths,
2749 use crate::options::WasiExecModel;
2750 use crate::utils::{NativeLib, NativeLibKind};
2751 use rustc_errors::LanguageIdentifier;
2752 use rustc_feature::UnstableFeatures;
2753 use rustc_span::edition::Edition;
2754 use rustc_span::RealFileName;
2755 use rustc_target::spec::{CodeModel, MergeFunctions, PanicStrategy, RelocModel};
2756 use rustc_target::spec::{
2757 RelroLevel, SanitizerSet, SplitDebuginfo, StackProtector, TargetTriple, TlsModel,
2759 use std::collections::hash_map::DefaultHasher;
2760 use std::collections::BTreeMap;
2761 use std::hash::Hash;
2762 use std::num::NonZeroUsize;
2763 use std::path::PathBuf;
2765 pub trait DepTrackingHash {
2768 hasher: &mut DefaultHasher,
2769 error_format: ErrorOutputType,
2770 for_crate_hash: bool,
2774 macro_rules! impl_dep_tracking_hash_via_hash {
2775 ($($t:ty),+ $(,)?) => {$(
2776 impl DepTrackingHash for $t {
2777 fn hash(&self, hasher: &mut DefaultHasher, _: ErrorOutputType, _for_crate_hash: bool) {
2778 Hash::hash(self, hasher);
2784 impl<T: DepTrackingHash> DepTrackingHash for Option<T> {
2787 hasher: &mut DefaultHasher,
2788 error_format: ErrorOutputType,
2789 for_crate_hash: bool,
2793 Hash::hash(&1, hasher);
2794 DepTrackingHash::hash(x, hasher, error_format, for_crate_hash);
2796 None => Hash::hash(&0, hasher),
2801 impl_dep_tracking_hash_via_hash!(
2836 SymbolManglingVersion,
2837 SourceFileHashAlgorithm,
2848 impl<T1, T2> DepTrackingHash for (T1, T2)
2850 T1: DepTrackingHash,
2851 T2: DepTrackingHash,
2855 hasher: &mut DefaultHasher,
2856 error_format: ErrorOutputType,
2857 for_crate_hash: bool,
2859 Hash::hash(&0, hasher);
2860 DepTrackingHash::hash(&self.0, hasher, error_format, for_crate_hash);
2861 Hash::hash(&1, hasher);
2862 DepTrackingHash::hash(&self.1, hasher, error_format, for_crate_hash);
2866 impl<T1, T2, T3> DepTrackingHash for (T1, T2, T3)
2868 T1: DepTrackingHash,
2869 T2: DepTrackingHash,
2870 T3: DepTrackingHash,
2874 hasher: &mut DefaultHasher,
2875 error_format: ErrorOutputType,
2876 for_crate_hash: bool,
2878 Hash::hash(&0, hasher);
2879 DepTrackingHash::hash(&self.0, hasher, error_format, for_crate_hash);
2880 Hash::hash(&1, hasher);
2881 DepTrackingHash::hash(&self.1, hasher, error_format, for_crate_hash);
2882 Hash::hash(&2, hasher);
2883 DepTrackingHash::hash(&self.2, hasher, error_format, for_crate_hash);
2887 impl<T: DepTrackingHash> DepTrackingHash for Vec<T> {
2890 hasher: &mut DefaultHasher,
2891 error_format: ErrorOutputType,
2892 for_crate_hash: bool,
2894 Hash::hash(&self.len(), hasher);
2895 for (index, elem) in self.iter().enumerate() {
2896 Hash::hash(&index, hasher);
2897 DepTrackingHash::hash(elem, hasher, error_format, for_crate_hash);
2902 impl DepTrackingHash for OutputTypes {
2905 hasher: &mut DefaultHasher,
2906 error_format: ErrorOutputType,
2907 for_crate_hash: bool,
2909 Hash::hash(&self.0.len(), hasher);
2910 for (key, val) in &self.0 {
2911 DepTrackingHash::hash(key, hasher, error_format, for_crate_hash);
2912 if !for_crate_hash {
2913 DepTrackingHash::hash(val, hasher, error_format, for_crate_hash);
2919 // This is a stable hash because BTreeMap is a sorted container
2920 pub(crate) fn stable_hash(
2921 sub_hashes: BTreeMap<&'static str, &dyn DepTrackingHash>,
2922 hasher: &mut DefaultHasher,
2923 error_format: ErrorOutputType,
2924 for_crate_hash: bool,
2926 for (key, sub_hash) in sub_hashes {
2927 // Using Hash::hash() instead of DepTrackingHash::hash() is fine for
2928 // the keys, as they are just plain strings
2929 Hash::hash(&key.len(), hasher);
2930 Hash::hash(key, hasher);
2931 sub_hash.hash(hasher, error_format, for_crate_hash);
2936 /// Default behavior to use in out-of-memory situations.
2937 #[derive(Clone, Copy, PartialEq, Hash, Debug, Encodable, Decodable, HashStable_Generic)]
2938 pub enum OomStrategy {
2939 /// Generate a panic that can be caught by `catch_unwind`.
2942 /// Abort the process immediately.
2947 pub const SYMBOL: &'static str = "__rust_alloc_error_handler_should_panic";
2949 pub fn should_panic(self) -> u8 {
2951 OomStrategy::Panic => 1,
2952 OomStrategy::Abort => 0,
2957 /// How to run proc-macro code when building this crate
2958 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
2959 pub enum ProcMacroExecutionStrategy {
2960 /// Run the proc-macro code on the same thread as the server.
2963 /// Run the proc-macro code on a different thread.