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android / toolchain / rustc / 5139364148b53d79de1b5e778004d41a6a33a4a2 / . / compiler / rustc_session / src / config.rs
blob: f745bc390cadcdb7fc6fc66db3c8b64d880bfb5c [file] [log] [blame]
//! Contains infrastructure for configuring the compiler, including parsing
//! command-line options.
pub use crate::options::*;
use crate::errors::FileWriteFail;
use crate::search_paths::SearchPath;
use crate::utils::{CanonicalizedPath, NativeLib, NativeLibKind};
use crate::{lint, HashStableContext};
use crate::{EarlyErrorHandler, Session};
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexSet};
use rustc_data_structures::stable_hasher::{StableOrd, ToStableHashKey};
use rustc_target::abi::Align;
use rustc_target::spec::LinkSelfContainedComponents;
use rustc_target::spec::{PanicStrategy, RelocModel, SanitizerSet, SplitDebuginfo};
use rustc_target::spec::{Target, TargetTriple, TargetWarnings, TARGETS};
use rustc_feature::UnstableFeatures;
use rustc_span::edition::{Edition, DEFAULT_EDITION, EDITION_NAME_LIST, LATEST_STABLE_EDITION};
use rustc_span::source_map::FilePathMapping;
use rustc_span::symbol::{sym, Symbol};
use rustc_span::{FileName, FileNameDisplayPreference, RealFileName, SourceFileHashAlgorithm};
use rustc_errors::emitter::HumanReadableErrorType;
use rustc_errors::{ColorConfig, DiagnosticArgValue, HandlerFlags, IntoDiagnosticArg};
use std::collections::btree_map::{
Iter as BTreeMapIter, Keys as BTreeMapKeysIter, Values as BTreeMapValuesIter,
};
use std::collections::{BTreeMap, BTreeSet};
use std::ffi::OsStr;
use std::fmt;
use std::fs;
use std::hash::Hash;
use std::iter;
use std::path::{Path, PathBuf};
use std::str::{self, FromStr};
use std::sync::LazyLock;
pub mod sigpipe;
/// The different settings that the `-C strip` flag can have.
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum Strip {
/// Do not strip at all.
None,
/// Strip debuginfo.
Debuginfo,
/// Strip all symbols.
Symbols,
}
/// The different settings that the `-C control-flow-guard` flag can have.
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum CFGuard {
/// Do not emit Control Flow Guard metadata or checks.
Disabled,
/// Emit Control Flow Guard metadata but no checks.
NoChecks,
/// Emit Control Flow Guard metadata and checks.
Checks,
}
/// The different settings that the `-Z cf-protection` flag can have.
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum CFProtection {
/// Do not enable control-flow protection
None,
/// Emit control-flow protection for branches (enables indirect branch tracking).
Branch,
/// Emit control-flow protection for returns.
Return,
/// Emit control-flow protection for both branches and returns.
Full,
}
#[derive(Clone, Copy, Debug, PartialEq, Hash, HashStable_Generic)]
pub enum OptLevel {
No, // -O0
Less, // -O1
Default, // -O2
Aggressive, // -O3
Size, // -Os
SizeMin, // -Oz
}
/// This is what the `LtoCli` values get mapped to after resolving defaults and
/// and taking other command line options into account.
///
/// Note that linker plugin-based LTO is a different mechanism entirely.
#[derive(Clone, PartialEq)]
pub enum Lto {
/// Don't do any LTO whatsoever.
No,
/// Do a full-crate-graph (inter-crate) LTO with ThinLTO.
Thin,
/// Do a local ThinLTO (intra-crate, over the CodeGen Units of the local crate only). This is
/// only relevant if multiple CGUs are used.
ThinLocal,
/// Do a full-crate-graph (inter-crate) LTO with "fat" LTO.
Fat,
}
/// The different settings that the `-C lto` flag can have.
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum LtoCli {
/// `-C lto=no`
No,
/// `-C lto=yes`
Yes,
/// `-C lto`
NoParam,
/// `-C lto=thin`
Thin,
/// `-C lto=fat`
Fat,
/// No `-C lto` flag passed
Unspecified,
}
/// The different settings that the `-Z dump_mir_spanview` flag can have. `Statement` generates a
/// document highlighting each span of every statement (including terminators). `Terminator` and
/// `Block` highlight a single span per `BasicBlock`: the span of the block's `Terminator`, or a
/// computed span for the block, representing the entire range, covering the block's terminator and
/// all of its statements.
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum MirSpanview {
/// Default `-Z dump_mir_spanview` or `-Z dump_mir_spanview=statement`
Statement,
/// `-Z dump_mir_spanview=terminator`
Terminator,
/// `-Z dump_mir_spanview=block`
Block,
}
/// The different settings that the `-C instrument-coverage` flag can have.
///
/// Coverage instrumentation now supports combining `-C instrument-coverage`
/// with compiler and linker optimization (enabled with `-O` or `-C opt-level=1`
/// and higher). Nevertheless, there are many variables, depending on options
/// selected, code structure, and enabled attributes. If errors are encountered,
/// either while compiling or when generating `llvm-cov show` reports, consider
/// lowering the optimization level, including or excluding `-C link-dead-code`,
/// or using `-Zunstable-options -C instrument-coverage=except-unused-functions`
/// or `-Zunstable-options -C instrument-coverage=except-unused-generics`.
///
/// Note that `ExceptUnusedFunctions` means: When `mapgen.rs` generates the
/// coverage map, it will not attempt to generate synthetic functions for unused
/// (and not code-generated) functions (whether they are generic or not). As a
/// result, non-codegenned functions will not be included in the coverage map,
/// and will not appear, as covered or uncovered, in coverage reports.
///
/// `ExceptUnusedGenerics` will add synthetic functions to the coverage map,
/// unless the function has type parameters.
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum InstrumentCoverage {
/// Default `-C instrument-coverage` or `-C instrument-coverage=statement`
All,
/// Additionally, instrument branches and output branch coverage.
/// `-Zunstable-options -C instrument-coverage=branch`
Branch,
/// `-Zunstable-options -C instrument-coverage=except-unused-generics`
ExceptUnusedGenerics,
/// `-Zunstable-options -C instrument-coverage=except-unused-functions`
ExceptUnusedFunctions,
/// `-C instrument-coverage=off` (or `no`, etc.)
Off,
}
/// Settings for `-Z instrument-xray` flag.
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash)]
pub struct InstrumentXRay {
/// `-Z instrument-xray=always`, force instrumentation
pub always: bool,
/// `-Z instrument-xray=never`, disable instrumentation
pub never: bool,
/// `-Z instrument-xray=ignore-loops`, ignore presence of loops,
/// instrument functions based only on instruction count
pub ignore_loops: bool,
/// `-Z instrument-xray=instruction-threshold=N`, explicitly set instruction threshold
/// for instrumentation, or `None` to use compiler's default
pub instruction_threshold: Option<usize>,
/// `-Z instrument-xray=skip-entry`, do not instrument function entry
pub skip_entry: bool,
/// `-Z instrument-xray=skip-exit`, do not instrument function exit
pub skip_exit: bool,
}
#[derive(Clone, PartialEq, Hash, Debug)]
pub enum LinkerPluginLto {
LinkerPlugin(PathBuf),
LinkerPluginAuto,
Disabled,
}
impl LinkerPluginLto {
pub fn enabled(&self) -> bool {
match *self {
LinkerPluginLto::LinkerPlugin(_) | LinkerPluginLto::LinkerPluginAuto => true,
LinkerPluginLto::Disabled => false,
}
}
}
/// The different values `-C link-self-contained` can take: a list of individually enabled or
/// disabled components used during linking, coming from the rustc distribution, instead of being
/// found somewhere on the host system.
///
/// They can be set in bulk via `-C link-self-contained=yes|y|on` or `-C
/// link-self-contained=no|n|off`, and those boolean values are the historical defaults.
///
/// But each component is fine-grained, and can be unstably targeted, to use:
/// - some CRT objects
/// - the libc static library
/// - libgcc/libunwind libraries
/// - a linker we distribute
/// - some sanitizer runtime libraries
/// - all other MinGW libraries and Windows import libs
///
#[derive(Default, Clone, PartialEq, Debug)]
pub struct LinkSelfContained {
/// Whether the user explicitly set `-C link-self-contained` on or off, the historical values.
/// Used for compatibility with the existing opt-in and target inference.
pub explicitly_set: Option<bool>,
/// The components that are enabled on the CLI, using the `+component` syntax or one of the
/// `true` shorcuts.
enabled_components: LinkSelfContainedComponents,
/// The components that are disabled on the CLI, using the `-component` syntax or one of the
/// `false` shortcuts.
disabled_components: LinkSelfContainedComponents,
}
impl LinkSelfContained {
/// Incorporates an enabled or disabled component as specified on the CLI, if possible.
/// For example: `+linker`, and `-crto`.
pub(crate) fn handle_cli_component(&mut self, component: &str) -> Option<()> {
// Note that for example `-Cself-contained=y -Cself-contained=-linker` is not an explicit
// set of all values like `y` or `n` used to be. Therefore, if this flag had previously been
// set in bulk with its historical values, then manually setting a component clears that
// `explicitly_set` state.
if let Some(component_to_enable) = component.strip_prefix('+') {
self.explicitly_set = None;
self.enabled_components
.insert(LinkSelfContainedComponents::from_str(component_to_enable)?);
Some(())
} else if let Some(component_to_disable) = component.strip_prefix('-') {
self.explicitly_set = None;
self.disabled_components
.insert(LinkSelfContainedComponents::from_str(component_to_disable)?);
Some(())
} else {
None
}
}
/// Turns all components on or off and records that this was done explicitly for compatibility
/// purposes.
pub(crate) fn set_all_explicitly(&mut self, enabled: bool) {
self.explicitly_set = Some(enabled);
if enabled {
self.enabled_components = LinkSelfContainedComponents::all();
self.disabled_components = LinkSelfContainedComponents::empty();
} else {
self.enabled_components = LinkSelfContainedComponents::empty();
self.disabled_components = LinkSelfContainedComponents::all();
}
}
/// Helper creating a fully enabled `LinkSelfContained` instance. Used in tests.
pub fn on() -> Self {
let mut on = LinkSelfContained::default();
on.set_all_explicitly(true);
on
}
/// To help checking CLI usage while some of the values are unstable: returns whether one of the
/// components was set individually. This would also require the `-Zunstable-options` flag, to
/// be allowed.
fn are_unstable_variants_set(&self) -> bool {
let any_component_set =
!self.enabled_components.is_empty() || !self.disabled_components.is_empty();
self.explicitly_set.is_none() && any_component_set
}
/// Returns whether the self-contained linker component was enabled on the CLI, using the
/// `-C link-self-contained=+linker` syntax, or one of the `true` shorcuts.
pub fn is_linker_enabled(&self) -> bool {
self.enabled_components.contains(LinkSelfContainedComponents::LINKER)
}
/// Returns whether the self-contained linker component was disabled on the CLI, using the
/// `-C link-self-contained=-linker` syntax, or one of the `false` shorcuts.
pub fn is_linker_disabled(&self) -> bool {
self.disabled_components.contains(LinkSelfContainedComponents::LINKER)
}
/// Returns CLI inconsistencies to emit errors: individual components were both enabled and
/// disabled.
fn check_consistency(&self) -> Option<LinkSelfContainedComponents> {
if self.explicitly_set.is_some() {
None
} else {
let common = self.enabled_components.intersection(self.disabled_components);
if common.is_empty() { None } else { Some(common) }
}
}
}
/// Used with `-Z assert-incr-state`.
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum IncrementalStateAssertion {
/// Found and loaded an existing session directory.
///
/// Note that this says nothing about whether any particular query
/// will be found to be red or green.
Loaded,
/// Did not load an existing session directory.
NotLoaded,
}
/// The different settings that can be enabled via the `-Z location-detail` flag.
#[derive(Copy, Clone, PartialEq, Hash, Debug)]
pub struct LocationDetail {
pub file: bool,
pub line: bool,
pub column: bool,
}
impl LocationDetail {
pub fn all() -> Self {
Self { file: true, line: true, column: true }
}
}
#[derive(Clone, PartialEq, Hash, Debug)]
pub enum SwitchWithOptPath {
Enabled(Option<PathBuf>),
Disabled,
}
impl SwitchWithOptPath {
pub fn enabled(&self) -> bool {
match *self {
SwitchWithOptPath::Enabled(_) => true,
SwitchWithOptPath::Disabled => false,
}
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, HashStable_Generic)]
#[derive(Encodable, Decodable)]
pub enum SymbolManglingVersion {
Legacy,
V0,
}
#[derive(Clone, Copy, Debug, PartialEq, Hash)]
pub enum DebugInfo {
None,
LineDirectivesOnly,
LineTablesOnly,
Limited,
Full,
}
#[derive(Clone, Copy, Debug, PartialEq, Hash)]
pub enum DebugInfoCompression {
None,
Zlib,
Zstd,
}
impl ToString for DebugInfoCompression {
fn to_string(&self) -> String {
match self {
DebugInfoCompression::None => "none",
DebugInfoCompression::Zlib => "zlib",
DebugInfoCompression::Zstd => "zstd",
}
.to_owned()
}
}
/// Split debug-information is enabled by `-C split-debuginfo`, this enum is only used if split
/// debug-information is enabled (in either `Packed` or `Unpacked` modes), and the platform
/// uses DWARF for debug-information.
///
/// Some debug-information requires link-time relocation and some does not. LLVM can partition
/// the debuginfo into sections depending on whether or not it requires link-time relocation. Split
/// DWARF provides a mechanism which allows the linker to skip the sections which don't require
/// link-time relocation - either by putting those sections in DWARF object files, or by keeping
/// them in the object file in such a way that the linker will skip them.
#[derive(Clone, Copy, Debug, PartialEq, Hash)]
pub enum SplitDwarfKind {
/// Sections which do not require relocation are written into object file but ignored by the
/// linker.
Single,
/// Sections which do not require relocation are written into a DWARF object (`.dwo`) file
/// which is ignored by the linker.
Split,
}
impl FromStr for SplitDwarfKind {
type Err = ();
fn from_str(s: &str) -> Result<Self, ()> {
Ok(match s {
"single" => SplitDwarfKind::Single,
"split" => SplitDwarfKind::Split,
_ => return Err(()),
})
}
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, PartialOrd, Ord, HashStable_Generic)]
#[derive(Encodable, Decodable)]
pub enum OutputType {
Bitcode,
Assembly,
LlvmAssembly,
Mir,
Metadata,
Object,
Exe,
DepInfo,
}
// Safety: Trivial C-Style enums have a stable sort order across compilation sessions.
unsafe impl StableOrd for OutputType {
const CAN_USE_UNSTABLE_SORT: bool = true;
}
impl<HCX: HashStableContext> ToStableHashKey<HCX> for OutputType {
type KeyType = Self;
fn to_stable_hash_key(&self, _: &HCX) -> Self::KeyType {
*self
}
}
impl OutputType {
fn is_compatible_with_codegen_units_and_single_output_file(&self) -> bool {
match *self {
OutputType::Exe | OutputType::DepInfo | OutputType::Metadata => true,
OutputType::Bitcode
| OutputType::Assembly
| OutputType::LlvmAssembly
| OutputType::Mir
| OutputType::Object => false,
}
}
pub fn shorthand(&self) -> &'static str {
match *self {
OutputType::Bitcode => "llvm-bc",
OutputType::Assembly => "asm",
OutputType::LlvmAssembly => "llvm-ir",
OutputType::Mir => "mir",
OutputType::Object => "obj",
OutputType::Metadata => "metadata",
OutputType::Exe => "link",
OutputType::DepInfo => "dep-info",
}
}
fn from_shorthand(shorthand: &str) -> Option<Self> {
Some(match shorthand {
"asm" => OutputType::Assembly,
"llvm-ir" => OutputType::LlvmAssembly,
"mir" => OutputType::Mir,
"llvm-bc" => OutputType::Bitcode,
"obj" => OutputType::Object,
"metadata" => OutputType::Metadata,
"link" => OutputType::Exe,
"dep-info" => OutputType::DepInfo,
_ => return None,
})
}
fn shorthands_display() -> String {
format!(
"`{}`, `{}`, `{}`, `{}`, `{}`, `{}`, `{}`, `{}`",
OutputType::Bitcode.shorthand(),
OutputType::Assembly.shorthand(),
OutputType::LlvmAssembly.shorthand(),
OutputType::Mir.shorthand(),
OutputType::Object.shorthand(),
OutputType::Metadata.shorthand(),
OutputType::Exe.shorthand(),
OutputType::DepInfo.shorthand(),
)
}
pub fn extension(&self) -> &'static str {
match *self {
OutputType::Bitcode => "bc",
OutputType::Assembly => "s",
OutputType::LlvmAssembly => "ll",
OutputType::Mir => "mir",
OutputType::Object => "o",
OutputType::Metadata => "rmeta",
OutputType::DepInfo => "d",
OutputType::Exe => "",
}
}
pub fn is_text_output(&self) -> bool {
match *self {
OutputType::Assembly
| OutputType::LlvmAssembly
| OutputType::Mir
| OutputType::DepInfo => true,
OutputType::Bitcode | OutputType::Object | OutputType::Metadata | OutputType::Exe => {
false
}
}
}
}
/// The type of diagnostics output to generate.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum ErrorOutputType {
/// Output meant for the consumption of humans.
HumanReadable(HumanReadableErrorType),
/// Output that's consumed by other tools such as `rustfix` or the `RLS`.
Json {
/// Render the JSON in a human readable way (with indents and newlines).
pretty: bool,
/// The JSON output includes a `rendered` field that includes the rendered
/// human output.
json_rendered: HumanReadableErrorType,
},
}
impl Default for ErrorOutputType {
fn default() -> Self {
Self::HumanReadable(HumanReadableErrorType::Default(ColorConfig::Auto))
}
}
/// Parameter to control path trimming.
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash)]
pub enum TrimmedDefPaths {
/// `try_print_trimmed_def_path` never prints a trimmed path and never calls the expensive query
#[default]
Never,
/// `try_print_trimmed_def_path` calls the expensive query, the query doesn't call `delay_good_path_bug`
Always,
/// `try_print_trimmed_def_path` calls the expensive query, the query calls `delay_good_path_bug`
GoodPath,
}
#[derive(Clone, Hash, Debug)]
pub enum ResolveDocLinks {
/// Do not resolve doc links.
None,
/// Resolve doc links on exported items only for crate types that have metadata.
ExportedMetadata,
/// Resolve doc links on exported items.
Exported,
/// Resolve doc links on all items.
All,
}
/// Use tree-based collections to cheaply get a deterministic `Hash` implementation.
/// *Do not* switch `BTreeMap` out for an unsorted container type! That would break
/// dependency tracking for command-line arguments. Also only hash keys, since tracking
/// should only depend on the output types, not the paths they're written to.
#[derive(Clone, Debug, Hash, HashStable_Generic)]
pub struct OutputTypes(BTreeMap<OutputType, Option<OutFileName>>);
impl OutputTypes {
pub fn new(entries: &[(OutputType, Option<OutFileName>)]) -> OutputTypes {
OutputTypes(BTreeMap::from_iter(entries.iter().map(|&(k, ref v)| (k, v.clone()))))
}
pub fn get(&self, key: &OutputType) -> Option<&Option<OutFileName>> {
self.0.get(key)
}
pub fn contains_key(&self, key: &OutputType) -> bool {
self.0.contains_key(key)
}
pub fn iter(&self) -> BTreeMapIter<'_, OutputType, Option<OutFileName>> {
self.0.iter()
}
pub fn keys(&self) -> BTreeMapKeysIter<'_, OutputType, Option<OutFileName>> {
self.0.keys()
}
pub fn values(&self) -> BTreeMapValuesIter<'_, OutputType, Option<OutFileName>> {
self.0.values()
}
pub fn len(&self) -> usize {
self.0.len()
}
/// Returns `true` if any of the output types require codegen or linking.
pub fn should_codegen(&self) -> bool {
self.0.keys().any(|k| match *k {
OutputType::Bitcode
| OutputType::Assembly
| OutputType::LlvmAssembly
| OutputType::Mir
| OutputType::Object
| OutputType::Exe => true,
OutputType::Metadata | OutputType::DepInfo => false,
})
}
/// Returns `true` if any of the output types require linking.
pub fn should_link(&self) -> bool {
self.0.keys().any(|k| match *k {
OutputType::Bitcode
| OutputType::Assembly
| OutputType::LlvmAssembly
| OutputType::Mir
| OutputType::Metadata
| OutputType::Object
| OutputType::DepInfo => false,
OutputType::Exe => true,
})
}
}
/// Use tree-based collections to cheaply get a deterministic `Hash` implementation.
/// *Do not* switch `BTreeMap` or `BTreeSet` out for an unsorted container type! That
/// would break dependency tracking for command-line arguments.
#[derive(Clone)]
pub struct Externs(BTreeMap<String, ExternEntry>);
#[derive(Clone, Debug)]
pub struct ExternEntry {
pub location: ExternLocation,
/// Indicates this is a "private" dependency for the
/// `exported_private_dependencies` lint.
///
/// This can be set with the `priv` option like
/// `--extern priv:name=foo.rlib`.
pub is_private_dep: bool,
/// Add the extern entry to the extern prelude.
///
/// This can be disabled with the `noprelude` option like
/// `--extern noprelude:name`.
pub add_prelude: bool,
/// The extern entry shouldn't be considered for unused dependency warnings.
///
/// `--extern nounused:std=/path/to/lib/libstd.rlib`. This is used to
/// suppress `unused-crate-dependencies` warnings.
pub nounused_dep: bool,
/// If the extern entry is not referenced in the crate, force it to be resolved anyway.
///
/// Allows a dependency satisfying, for instance, a missing panic handler to be injected
/// without modifying source:
/// `--extern force:extras=/path/to/lib/libstd.rlib`
pub force: bool,
}
#[derive(Clone, Debug)]
pub enum ExternLocation {
/// Indicates to look for the library in the search paths.
///
/// Added via `--extern name`.
FoundInLibrarySearchDirectories,
/// The locations where this extern entry must be found.
///
/// The `CrateLoader` is responsible for loading these and figuring out
/// which one to use.
///
/// Added via `--extern prelude_name=some_file.rlib`
ExactPaths(BTreeSet<CanonicalizedPath>),
}
impl Externs {
/// Used for testing.
pub fn new(data: BTreeMap<String, ExternEntry>) -> Externs {
Externs(data)
}
pub fn get(&self, key: &str) -> Option<&ExternEntry> {
self.0.get(key)
}
pub fn iter(&self) -> BTreeMapIter<'_, String, ExternEntry> {
self.0.iter()
}
pub fn len(&self) -> usize {
self.0.len()
}
}
impl ExternEntry {
fn new(location: ExternLocation) -> ExternEntry {
ExternEntry {
location,
is_private_dep: false,
add_prelude: false,
nounused_dep: false,
force: false,
}
}
pub fn files(&self) -> Option<impl Iterator<Item = &CanonicalizedPath>> {
match &self.location {
ExternLocation::ExactPaths(set) => Some(set.iter()),
_ => None,
}
}
}
#[derive(Clone, PartialEq, Debug)]
pub struct PrintRequest {
pub kind: PrintKind,
pub out: OutFileName,
}
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub enum PrintKind {
FileNames,
Sysroot,
TargetLibdir,
CrateName,
Cfg,
CallingConventions,
TargetList,
TargetCPUs,
TargetFeatures,
RelocationModels,
CodeModels,
TlsModels,
TargetSpec,
AllTargetSpecs,
NativeStaticLibs,
StackProtectorStrategies,
LinkArgs,
SplitDebuginfo,
DeploymentTarget,
}
#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
pub enum TraitSolver {
/// Classic trait solver in `rustc_trait_selection::traits::select`
Classic,
/// Experimental trait solver in `rustc_trait_selection::solve`
Next,
/// Use the new trait solver during coherence
NextCoherence,
}
#[derive(Default, Debug, Copy, Clone, Hash, PartialEq, Eq)]
pub enum DumpSolverProofTree {
Always,
OnError,
#[default]
Never,
}
pub enum Input {
/// Load source code from a file.
File(PathBuf),
/// Load source code from a string.
Str {
/// A string that is shown in place of a filename.
name: FileName,
/// An anonymous string containing the source code.
input: String,
},
}
impl Input {
pub fn filestem(&self) -> &str {
match *self {
Input::File(ref ifile) => ifile.file_stem().unwrap().to_str().unwrap(),
Input::Str { .. } => "rust_out",
}
}
pub fn source_name(&self) -> FileName {
match *self {
Input::File(ref ifile) => ifile.clone().into(),
Input::Str { ref name, .. } => name.clone(),
}
}
pub fn opt_path(&self) -> Option<&Path> {
match self {
Input::File(file) => Some(file),
Input::Str { name, .. } => match name {
FileName::Real(real) => real.local_path(),
FileName::QuoteExpansion(_) => None,
FileName::Anon(_) => None,
FileName::MacroExpansion(_) => None,
FileName::ProcMacroSourceCode(_) => None,
FileName::CliCrateAttr(_) => None,
FileName::Custom(_) => None,
FileName::DocTest(path, _) => Some(path),
FileName::InlineAsm(_) => None,
},
}
}
}
#[derive(Clone, Hash, Debug, HashStable_Generic, PartialEq)]
pub enum OutFileName {
Real(PathBuf),
Stdout,
}
impl OutFileName {
pub fn parent(&self) -> Option<&Path> {
match *self {
OutFileName::Real(ref path) => path.parent(),
OutFileName::Stdout => None,
}
}
pub fn filestem(&self) -> Option<&OsStr> {
match *self {
OutFileName::Real(ref path) => path.file_stem(),
OutFileName::Stdout => Some(OsStr::new("stdout")),
}
}
pub fn is_stdout(&self) -> bool {
match *self {
OutFileName::Real(_) => false,
OutFileName::Stdout => true,
}
}
pub fn is_tty(&self) -> bool {
use std::io::IsTerminal;
match *self {
OutFileName::Real(_) => false,
OutFileName::Stdout => std::io::stdout().is_terminal(),
}
}
pub fn as_path(&self) -> &Path {
match *self {
OutFileName::Real(ref path) => path.as_ref(),
OutFileName::Stdout => &Path::new("stdout"),
}
}
/// For a given output filename, return the actual name of the file that
/// can be used to write codegen data of type `flavor`. For real-path
/// output filenames, this would be trivial as we can just use the path.
/// Otherwise for stdout, return a temporary path so that the codegen data
/// may be later copied to stdout.
pub fn file_for_writing(
&self,
outputs: &OutputFilenames,
flavor: OutputType,
codegen_unit_name: Option<&str>,
) -> PathBuf {
match *self {
OutFileName::Real(ref path) => path.clone(),
OutFileName::Stdout => outputs.temp_path(flavor, codegen_unit_name),
}
}
pub fn overwrite(&self, content: &str, sess: &Session) {
match self {
OutFileName::Stdout => print!("{content}"),
OutFileName::Real(path) => {
if let Err(e) = fs::write(path, content) {
sess.emit_fatal(FileWriteFail { path, err: e.to_string() });
}
}
}
}
}
#[derive(Clone, Hash, Debug, HashStable_Generic)]
pub struct OutputFilenames {
pub out_directory: PathBuf,
/// Crate name. Never contains '-'.
crate_stem: String,
/// Typically based on `.rs` input file name. Any '-' is preserved.
filestem: String,
pub single_output_file: Option<OutFileName>,
pub temps_directory: Option<PathBuf>,
pub outputs: OutputTypes,
}
pub const RLINK_EXT: &str = "rlink";
pub const RUST_CGU_EXT: &str = "rcgu";
pub const DWARF_OBJECT_EXT: &str = "dwo";
impl OutputFilenames {
pub fn new(
out_directory: PathBuf,
out_crate_name: String,
out_filestem: String,
single_output_file: Option<OutFileName>,
temps_directory: Option<PathBuf>,
extra: String,
outputs: OutputTypes,
) -> Self {
OutputFilenames {
out_directory,
single_output_file,
temps_directory,
outputs,
crate_stem: format!("{out_crate_name}{extra}"),
filestem: format!("{out_filestem}{extra}"),
}
}
pub fn path(&self, flavor: OutputType) -> OutFileName {
self.outputs
.get(&flavor)
.and_then(|p| p.to_owned())
.or_else(|| self.single_output_file.clone())
.unwrap_or_else(|| OutFileName::Real(self.output_path(flavor)))
}
/// Gets the output path where a compilation artifact of the given type
/// should be placed on disk.
pub fn output_path(&self, flavor: OutputType) -> PathBuf {
let extension = flavor.extension();
match flavor {
OutputType::Metadata => {
self.out_directory.join(format!("lib{}.{}", self.crate_stem, extension))
}
_ => self.with_directory_and_extension(&self.out_directory, extension),
}
}
/// Gets the path where a compilation artifact of the given type for the
/// given codegen unit should be placed on disk. If codegen_unit_name is
/// None, a path distinct from those of any codegen unit will be generated.
pub fn temp_path(&self, flavor: OutputType, codegen_unit_name: Option<&str>) -> PathBuf {
let extension = flavor.extension();
self.temp_path_ext(extension, codegen_unit_name)
}
/// Like `temp_path`, but specifically for dwarf objects.
pub fn temp_path_dwo(&self, codegen_unit_name: Option<&str>) -> PathBuf {
self.temp_path_ext(DWARF_OBJECT_EXT, codegen_unit_name)
}
/// Like `temp_path`, but also supports things where there is no corresponding
/// OutputType, like noopt-bitcode or lto-bitcode.
pub fn temp_path_ext(&self, ext: &str, codegen_unit_name: Option<&str>) -> PathBuf {
let mut extension = String::new();
if let Some(codegen_unit_name) = codegen_unit_name {
extension.push_str(codegen_unit_name);
}
if !ext.is_empty() {
if !extension.is_empty() {
extension.push('.');
extension.push_str(RUST_CGU_EXT);
extension.push('.');
}
extension.push_str(ext);
}
let temps_directory = self.temps_directory.as_ref().unwrap_or(&self.out_directory);
self.with_directory_and_extension(temps_directory, &extension)
}
pub fn with_extension(&self, extension: &str) -> PathBuf {
self.with_directory_and_extension(&self.out_directory, extension)
}
fn with_directory_and_extension(&self, directory: &PathBuf, extension: &str) -> PathBuf {
let mut path = directory.join(&self.filestem);
path.set_extension(extension);
path
}
/// Returns the path for the Split DWARF file - this can differ depending on which Split DWARF
/// mode is being used, which is the logic that this function is intended to encapsulate.
pub fn split_dwarf_path(
&self,
split_debuginfo_kind: SplitDebuginfo,
split_dwarf_kind: SplitDwarfKind,
cgu_name: Option<&str>,
) -> Option<PathBuf> {
let obj_out = self.temp_path(OutputType::Object, cgu_name);
let dwo_out = self.temp_path_dwo(cgu_name);
match (split_debuginfo_kind, split_dwarf_kind) {
(SplitDebuginfo::Off, SplitDwarfKind::Single | SplitDwarfKind::Split) => None,
// Single mode doesn't change how DWARF is emitted, but does add Split DWARF attributes
// (pointing at the path which is being determined here). Use the path to the current
// object file.
(SplitDebuginfo::Packed | SplitDebuginfo::Unpacked, SplitDwarfKind::Single) => {
Some(obj_out)
}
// Split mode emits the DWARF into a different file, use that path.
(SplitDebuginfo::Packed | SplitDebuginfo::Unpacked, SplitDwarfKind::Split) => {
Some(dwo_out)
}
}
}
}
bitflags::bitflags! {
/// Scopes used to determined if it need to apply to --remap-path-prefix
pub struct RemapPathScopeComponents: u8 {
/// Apply remappings to the expansion of std::file!() macro
const MACRO = 1 << 0;
/// Apply remappings to printed compiler diagnostics
const DIAGNOSTICS = 1 << 1;
/// Apply remappings to debug information only when they are written to
/// compiled executables or libraries, but not when they are in split
/// debuginfo files
const UNSPLIT_DEBUGINFO = 1 << 2;
/// Apply remappings to debug information only when they are written to
/// split debug information files, but not in compiled executables or
/// libraries
const SPLIT_DEBUGINFO = 1 << 3;
/// Apply remappings to the paths pointing to split debug information
/// files. Does nothing when these files are not generated.
const SPLIT_DEBUGINFO_PATH = 1 << 4;
/// An alias for macro,unsplit-debuginfo,split-debuginfo-path. This
/// ensures all paths in compiled executables or libraries are remapped
/// but not elsewhere.
const OBJECT = Self::MACRO.bits | Self::UNSPLIT_DEBUGINFO.bits | Self::SPLIT_DEBUGINFO_PATH.bits;
}
}
pub fn host_triple() -> &'static str {
// Get the host triple out of the build environment. This ensures that our
// idea of the host triple is the same as for the set of libraries we've
// actually built. We can't just take LLVM's host triple because they
// normalize all ix86 architectures to i386.
//
// Instead of grabbing the host triple (for the current host), we grab (at
// compile time) the target triple that this rustc is built with and
// calling that (at runtime) the host triple.
(option_env!("CFG_COMPILER_HOST_TRIPLE")).expect("CFG_COMPILER_HOST_TRIPLE")
}
fn file_path_mapping(
remap_path_prefix: Vec<(PathBuf, PathBuf)>,
unstable_opts: &UnstableOptions,
) -> FilePathMapping {
FilePathMapping::new(
remap_path_prefix.clone(),
if unstable_opts.remap_path_scope.contains(RemapPathScopeComponents::DIAGNOSTICS)
&& !remap_path_prefix.is_empty()
{
FileNameDisplayPreference::Remapped
} else {
FileNameDisplayPreference::Local
},
)
}
impl Default for Options {
fn default() -> Options {
Options {
assert_incr_state: None,
crate_types: Vec::new(),
optimize: OptLevel::No,
debuginfo: DebugInfo::None,
debuginfo_compression: DebugInfoCompression::None,
lint_opts: Vec::new(),
lint_cap: None,
describe_lints: false,
output_types: OutputTypes(BTreeMap::new()),
search_paths: vec![],
maybe_sysroot: None,
target_triple: TargetTriple::from_triple(host_triple()),
test: false,
incremental: None,
untracked_state_hash: Default::default(),
unstable_opts: Default::default(),
prints: Vec::new(),
cg: Default::default(),
error_format: ErrorOutputType::default(),
diagnostic_width: None,
externs: Externs(BTreeMap::new()),
crate_name: None,
libs: Vec::new(),
unstable_features: UnstableFeatures::Disallow,
debug_assertions: true,
actually_rustdoc: false,
resolve_doc_links: ResolveDocLinks::None,
trimmed_def_paths: TrimmedDefPaths::default(),
cli_forced_codegen_units: None,
cli_forced_local_thinlto_off: false,
remap_path_prefix: Vec::new(),
real_rust_source_base_dir: None,
edition: DEFAULT_EDITION,
json_artifact_notifications: false,
json_unused_externs: JsonUnusedExterns::No,
json_future_incompat: false,
pretty: None,
working_dir: RealFileName::LocalPath(std::env::current_dir().unwrap()),
color: ColorConfig::Auto,
}
}
}
impl Options {
/// Returns `true` if there is a reason to build the dep graph.
pub fn build_dep_graph(&self) -> bool {
self.incremental.is_some()
|| self.unstable_opts.dump_dep_graph
|| self.unstable_opts.query_dep_graph
}
pub fn file_path_mapping(&self) -> FilePathMapping {
file_path_mapping(self.remap_path_prefix.clone(), &self.unstable_opts)
}
/// Returns `true` if there will be an output file generated.
pub fn will_create_output_file(&self) -> bool {
!self.unstable_opts.parse_only && // The file is just being parsed
self.unstable_opts.ls.is_empty() // The file is just being queried
}
#[inline]
pub fn share_generics(&self) -> bool {
match self.unstable_opts.share_generics {
Some(setting) => setting,
None => match self.optimize {
OptLevel::No | OptLevel::Less | OptLevel::Size | OptLevel::SizeMin => true,
OptLevel::Default | OptLevel::Aggressive => false,
},
}
}
pub fn get_symbol_mangling_version(&self) -> SymbolManglingVersion {
self.cg.symbol_mangling_version.unwrap_or(SymbolManglingVersion::Legacy)
}
}
impl UnstableOptions {
pub fn diagnostic_handler_flags(&self, can_emit_warnings: bool) -> HandlerFlags {
HandlerFlags {
can_emit_warnings,
treat_err_as_bug: self.treat_err_as_bug,
dont_buffer_diagnostics: self.dont_buffer_diagnostics,
report_delayed_bugs: self.report_delayed_bugs,
macro_backtrace: self.macro_backtrace,
deduplicate_diagnostics: self.deduplicate_diagnostics,
track_diagnostics: self.track_diagnostics,
}
}
}
// The type of entry function, so users can have their own entry functions
#[derive(Copy, Clone, PartialEq, Hash, Debug, HashStable_Generic)]
pub enum EntryFnType {
Main {
/// Specifies what to do with `SIGPIPE` before calling `fn main()`.
///
/// What values that are valid and what they mean must be in sync
/// across rustc and libstd, but we don't want it public in libstd,
/// so we take a bit of an unusual approach with simple constants
/// and an `include!()`.
sigpipe: u8,
},
Start,
}
#[derive(Copy, PartialEq, PartialOrd, Clone, Ord, Eq, Hash, Debug, Encodable, Decodable)]
#[derive(HashStable_Generic)]
pub enum CrateType {
Executable,
Dylib,
Rlib,
Staticlib,
Cdylib,
ProcMacro,
}
impl CrateType {
pub fn has_metadata(self) -> bool {
match self {
CrateType::Rlib | CrateType::Dylib | CrateType::ProcMacro => true,
CrateType::Executable | CrateType::Cdylib | CrateType::Staticlib => false,
}
}
}
#[derive(Clone, Hash, Debug, PartialEq, Eq)]
pub enum Passes {
Some(Vec<String>),
All,
}
impl Passes {
pub fn is_empty(&self) -> bool {
match *self {
Passes::Some(ref v) => v.is_empty(),
Passes::All => false,
}
}
pub fn extend(&mut self, passes: impl IntoIterator<Item = String>) {
match *self {
Passes::Some(ref mut v) => v.extend(passes),
Passes::All => {}
}
}
}
#[derive(Clone, Copy, Hash, Debug, PartialEq)]
pub enum PAuthKey {
A,
B,
}
#[derive(Clone, Copy, Hash, Debug, PartialEq)]
pub struct PacRet {
pub leaf: bool,
pub key: PAuthKey,
}
#[derive(Clone, Copy, Hash, Debug, PartialEq, Default)]
pub struct BranchProtection {
pub bti: bool,
pub pac_ret: Option<PacRet>,
}
pub const fn default_lib_output() -> CrateType {
CrateType::Rlib
}
fn default_configuration(sess: &Session) -> Cfg {
// NOTE: This should be kept in sync with `CheckCfg::fill_well_known` below.
let end = &sess.target.endian;
let arch = &sess.target.arch;
let wordsz = sess.target.pointer_width.to_string();
let os = &sess.target.os;
let env = &sess.target.env;
let abi = &sess.target.abi;
let relocation_model = sess.target.relocation_model.desc_symbol();
let vendor = &sess.target.vendor;
let min_atomic_width = sess.target.min_atomic_width();
let max_atomic_width = sess.target.max_atomic_width();
let atomic_cas = sess.target.atomic_cas;
let layout = sess.target.parse_data_layout().unwrap_or_else(|err| {
sess.emit_fatal(err);
});
let mut ret = Cfg::default();
ret.reserve(7); // the minimum number of insertions
// Target bindings.
ret.insert((sym::target_os, Some(Symbol::intern(os))));
for fam in sess.target.families.as_ref() {
ret.insert((sym::target_family, Some(Symbol::intern(fam))));
if fam == "windows" {
ret.insert((sym::windows, None));
} else if fam == "unix" {
ret.insert((sym::unix, None));
}
}
ret.insert((sym::target_arch, Some(Symbol::intern(arch))));
ret.insert((sym::target_endian, Some(Symbol::intern(end.as_str()))));
ret.insert((sym::target_pointer_width, Some(Symbol::intern(&wordsz))));
ret.insert((sym::target_env, Some(Symbol::intern(env))));
ret.insert((sym::target_abi, Some(Symbol::intern(abi))));
if sess.is_nightly_build() {
ret.insert((sym::relocation_model, Some(relocation_model)));
}
ret.insert((sym::target_vendor, Some(Symbol::intern(vendor))));
if sess.target.has_thread_local {
ret.insert((sym::target_thread_local, None));
}
let mut has_atomic = false;
for (i, align) in [
(8, layout.i8_align.abi),
(16, layout.i16_align.abi),
(32, layout.i32_align.abi),
(64, layout.i64_align.abi),
(128, layout.i128_align.abi),
] {
if i >= min_atomic_width && i <= max_atomic_width {
has_atomic = true;
let mut insert_atomic = |s, align: Align| {
ret.insert((sym::target_has_atomic_load_store, Some(Symbol::intern(s))));
if atomic_cas {
ret.insert((sym::target_has_atomic, Some(Symbol::intern(s))));
}
if align.bits() == i {
ret.insert((sym::target_has_atomic_equal_alignment, Some(Symbol::intern(s))));
}
};
let s = i.to_string();
insert_atomic(&s, align);
if s == wordsz {
insert_atomic("ptr", layout.pointer_align.abi);
}
}
}
if sess.is_nightly_build() && has_atomic {
ret.insert((sym::target_has_atomic_load_store, None));
if atomic_cas {
ret.insert((sym::target_has_atomic, None));
}
}
let panic_strategy = sess.panic_strategy();
ret.insert((sym::panic, Some(panic_strategy.desc_symbol())));
for mut s in sess.opts.unstable_opts.sanitizer {
// KASAN should use the same attribute name as ASAN, as it's still ASAN
// under the hood
if s == SanitizerSet::KERNELADDRESS {
s = SanitizerSet::ADDRESS;
}
let symbol = Symbol::intern(&s.to_string());
ret.insert((sym::sanitize, Some(symbol)));
}
if sess.is_sanitizer_cfi_generalize_pointers_enabled() {
ret.insert((sym::sanitizer_cfi_generalize_pointers, None));
}
if sess.is_sanitizer_cfi_normalize_integers_enabled() {
ret.insert((sym::sanitizer_cfi_normalize_integers, None));
}
if sess.opts.debug_assertions {
ret.insert((sym::debug_assertions, None));
}
if sess.overflow_checks() {
ret.insert((sym::overflow_checks, None));
}
// JUSTIFICATION: before wrapper fn is available
#[allow(rustc::bad_opt_access)]
if sess.opts.crate_types.contains(&CrateType::ProcMacro) {
ret.insert((sym::proc_macro, None));
}
ret
}
/// The parsed `--cfg` options that define the compilation environment of the
/// crate, used to drive conditional compilation.
///
/// An `FxIndexSet` is used to ensure deterministic ordering of error messages
/// relating to `--cfg`.
pub type Cfg = FxIndexSet<(Symbol, Option<Symbol>)>;
/// The parsed `--check-cfg` options.
#[derive(Default)]
pub struct CheckCfg {
/// Is well known names activated
pub exhaustive_names: bool,
/// Is well known values activated
pub exhaustive_values: bool,
/// All the expected values for a config name
pub expecteds: FxHashMap<Symbol, ExpectedValues<Symbol>>,
}
pub enum ExpectedValues<T> {
Some(FxHashSet<Option<T>>),
Any,
}
impl<T: Eq + Hash> ExpectedValues<T> {
fn insert(&mut self, value: T) -> bool {
match self {
ExpectedValues::Some(expecteds) => expecteds.insert(Some(value)),
ExpectedValues::Any => false,
}
}
}
impl<T: Eq + Hash> Extend<T> for ExpectedValues<T> {
fn extend<I: IntoIterator<Item = T>>(&mut self, iter: I) {
match self {
ExpectedValues::Some(expecteds) => expecteds.extend(iter.into_iter().map(Some)),
ExpectedValues::Any => {}
}
}
}
impl<'a, T: Eq + Hash + Copy + 'a> Extend<&'a T> for ExpectedValues<T> {
fn extend<I: IntoIterator<Item = &'a T>>(&mut self, iter: I) {
match self {
ExpectedValues::Some(expecteds) => expecteds.extend(iter.into_iter().map(|a| Some(*a))),
ExpectedValues::Any => {}
}
}
}
impl CheckCfg {
pub fn fill_well_known(&mut self, current_target: &Target) {
if !self.exhaustive_values && !self.exhaustive_names {
return;
}
let no_values = || {
let mut values = FxHashSet::default();
values.insert(None);
ExpectedValues::Some(values)
};
let empty_values = || {
let values = FxHashSet::default();
ExpectedValues::Some(values)
};
// NOTE: This should be kept in sync with `default_configuration`
let panic_values = &PanicStrategy::all();
let atomic_values = &[
sym::ptr,
sym::integer(8usize),
sym::integer(16usize),
sym::integer(32usize),
sym::integer(64usize),
sym::integer(128usize),
];
let sanitize_values = SanitizerSet::all()
.into_iter()
.map(|sanitizer| Symbol::intern(sanitizer.as_str().unwrap()));
let relocation_model_values = RelocModel::all();
// Unknown possible values:
// - `feature`
// - `target_feature`
for name in [sym::feature, sym::target_feature] {
self.expecteds.entry(name).or_insert(ExpectedValues::Any);
}
// No-values
for name in [
sym::doc,
sym::miri,
sym::unix,
sym::test,
sym::doctest,
sym::windows,
sym::proc_macro,
sym::debug_assertions,
sym::overflow_checks,
sym::target_thread_local,
] {
self.expecteds.entry(name).or_insert_with(no_values);
}
// Pre-defined values
self.expecteds.entry(sym::panic).or_insert_with(empty_values).extend(panic_values);
self.expecteds.entry(sym::sanitize).or_insert_with(empty_values).extend(sanitize_values);
self.expecteds
.entry(sym::target_has_atomic)
.or_insert_with(no_values)
.extend(atomic_values);
self.expecteds
.entry(sym::target_has_atomic_load_store)
.or_insert_with(no_values)
.extend(atomic_values);
self.expecteds
.entry(sym::target_has_atomic_equal_alignment)
.or_insert_with(no_values)
.extend(atomic_values);
self.expecteds
.entry(sym::relocation_model)
.or_insert_with(empty_values)
.extend(relocation_model_values);
// Target specific values
{
const VALUES: [&Symbol; 8] = [
&sym::target_os,
&sym::target_family,
&sym::target_arch,
&sym::target_endian,
&sym::target_env,
&sym::target_abi,
&sym::target_vendor,
&sym::target_pointer_width,
];
// Initialize (if not already initialized)
for &e in VALUES {
let entry = self.expecteds.entry(e);
if !self.exhaustive_values {
entry.or_insert(ExpectedValues::Any);
} else {
entry.or_insert_with(empty_values);
}
}
if self.exhaustive_values {
// Get all values map at once otherwise it would be costly.
// (8 values * 220 targets ~= 1760 times, at the time of writing this comment).
let [
values_target_os,
values_target_family,
values_target_arch,
values_target_endian,
values_target_env,
values_target_abi,
values_target_vendor,
values_target_pointer_width,
] = self
.expecteds
.get_many_mut(VALUES)
.expect("unable to get all the check-cfg values buckets");
for target in TARGETS
.iter()
.map(|target| Target::expect_builtin(&TargetTriple::from_triple(target)))
.chain(iter::once(current_target.clone()))
{
values_target_os.insert(Symbol::intern(&target.options.os));
values_target_family.extend(
target.options.families.iter().map(|family| Symbol::intern(family)),
);
values_target_arch.insert(Symbol::intern(&target.arch));
values_target_endian.insert(Symbol::intern(target.options.endian.as_str()));
values_target_env.insert(Symbol::intern(&target.options.env));
values_target_abi.insert(Symbol::intern(&target.options.abi));
values_target_vendor.insert(Symbol::intern(&target.options.vendor));
values_target_pointer_width.insert(sym::integer(target.pointer_width));
}
}
}
}
}
pub fn build_configuration(sess: &Session, mut user_cfg: Cfg) -> Cfg {
// Combine the configuration requested by the session (command line) with
// some default and generated configuration items.
let default_cfg = default_configuration(sess);
// If the user wants a test runner, then add the test cfg.
if sess.is_test_crate() {
user_cfg.insert((sym::test, None));
}
user_cfg.extend(default_cfg.iter().cloned());
user_cfg
}
pub(super) fn build_target_config(
handler: &EarlyErrorHandler,
opts: &Options,
target_override: Option<Target>,
sysroot: &Path,
) -> Target {
let target_result = target_override.map_or_else(
|| Target::search(&opts.target_triple, sysroot),
|t| Ok((t, TargetWarnings::empty())),
);
let (target, target_warnings) = target_result.unwrap_or_else(|e| {
handler.early_error(format!(
"Error loading target specification: {e}. \
Run `rustc --print target-list` for a list of built-in targets"
))
});
for warning in target_warnings.warning_messages() {
handler.early_warn(warning)
}
if !matches!(target.pointer_width, 16 | 32 | 64) {
handler.early_error(format!(
"target specification was invalid: unrecognized target-pointer-width {}",
target.pointer_width
))
}
target
}
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub enum OptionStability {
Stable,
Unstable,
}
pub struct RustcOptGroup {
pub apply: Box<dyn Fn(&mut getopts::Options) -> &mut getopts::Options>,
pub name: &'static str,
pub stability: OptionStability,
}
impl RustcOptGroup {
pub fn is_stable(&self) -> bool {
self.stability == OptionStability::Stable
}
pub fn stable<F>(name: &'static str, f: F) -> RustcOptGroup
where
F: Fn(&mut getopts::Options) -> &mut getopts::Options + 'static,
{
RustcOptGroup { name, apply: Box::new(f), stability: OptionStability::Stable }
}
pub fn unstable<F>(name: &'static str, f: F) -> RustcOptGroup
where
F: Fn(&mut getopts::Options) -> &mut getopts::Options + 'static,
{
RustcOptGroup { name, apply: Box::new(f), stability: OptionStability::Unstable }
}
}
// The `opt` local module holds wrappers around the `getopts` API that
// adds extra rustc-specific metadata to each option; such metadata
// is exposed by . The public
// functions below ending with `_u` are the functions that return
// *unstable* options, i.e., options that are only enabled when the
// user also passes the `-Z unstable-options` debugging flag.
mod opt {
// The `fn flag*` etc below are written so that we can use them
// in the future; do not warn about them not being used right now.
#![allow(dead_code)]
use super::RustcOptGroup;
pub type R = RustcOptGroup;
pub type S = &'static str;
fn stable<F>(name: S, f: F) -> R
where
F: Fn(&mut getopts::Options) -> &mut getopts::Options + 'static,
{
RustcOptGroup::stable(name, f)
}
fn unstable<F>(name: S, f: F) -> R
where
F: Fn(&mut getopts::Options) -> &mut getopts::Options + 'static,
{
RustcOptGroup::unstable(name, f)
}
fn longer(a: S, b: S) -> S {
if a.len() > b.len() { a } else { b }
}
pub fn opt_s(a: S, b: S, c: S, d: S) -> R {
stable(longer(a, b), move |opts| opts.optopt(a, b, c, d))
}
pub fn multi_s(a: S, b: S, c: S, d: S) -> R {
stable(longer(a, b), move |opts| opts.optmulti(a, b, c, d))
}
pub fn flag_s(a: S, b: S, c: S) -> R {
stable(longer(a, b), move |opts| opts.optflag(a, b, c))
}
pub fn flagmulti_s(a: S, b: S, c: S) -> R {
stable(longer(a, b), move |opts| opts.optflagmulti(a, b, c))
}
pub fn opt(a: S, b: S, c: S, d: S) -> R {
unstable(longer(a, b), move |opts| opts.optopt(a, b, c, d))
}
pub fn multi(a: S, b: S, c: S, d: S) -> R {
unstable(longer(a, b), move |opts| opts.optmulti(a, b, c, d))
}
}
static EDITION_STRING: LazyLock<String> = LazyLock::new(|| {
format!(
"Specify which edition of the compiler to use when compiling code. \
The default is {DEFAULT_EDITION} and the latest stable edition is {LATEST_STABLE_EDITION}."
)
});
/// Returns the "short" subset of the rustc command line options,
/// including metadata for each option, such as whether the option is
/// part of the stable long-term interface for rustc.
pub fn rustc_short_optgroups() -> Vec<RustcOptGroup> {
vec![
opt::flag_s("h", "help", "Display this message"),
opt::multi_s("", "cfg", "Configure the compilation environment.
SPEC supports the syntax `NAME[=\"VALUE\"]`.", "SPEC"),
opt::multi("", "check-cfg", "Provide list of valid cfg options for checking", "SPEC"),
opt::multi_s(
"L",
"",
"Add a directory to the library search path. The
optional KIND can be one of dependency, crate, native,
framework, or all (the default).",
"[KIND=]PATH",
),
opt::multi_s(
"l",
"",
"Link the generated crate(s) to the specified native
library NAME. The optional KIND can be one of
static, framework, or dylib (the default).
Optional comma separated MODIFIERS (bundle|verbatim|whole-archive|as-needed)
may be specified each with a prefix of either '+' to
enable or '-' to disable.",
"[KIND[:MODIFIERS]=]NAME[:RENAME]",
),
make_crate_type_option(),
opt::opt_s("", "crate-name", "Specify the name of the crate being built", "NAME"),
opt::opt_s(
"",
"edition",
&EDITION_STRING,
EDITION_NAME_LIST,
),
opt::multi_s(
"",
"emit",
"Comma separated list of types of output for \
the compiler to emit",
"[asm|llvm-bc|llvm-ir|obj|metadata|link|dep-info|mir]",
),
opt::multi_s(
"",
"print",
"Compiler information to print on stdout",
"[crate-name|file-names|sysroot|target-libdir|cfg|calling-conventions|\
target-list|target-cpus|target-features|relocation-models|code-models|\
tls-models|target-spec-json|all-target-specs-json|native-static-libs|\
stack-protector-strategies|link-args|deployment-target]",
),
opt::flagmulti_s("g", "", "Equivalent to -C debuginfo=2"),
opt::flagmulti_s("O", "", "Equivalent to -C opt-level=2"),
opt::opt_s("o", "", "Write output to <filename>", "FILENAME"),
opt::opt_s(
"",
"out-dir",
"Write output to compiler-chosen filename \
in <dir>",
"DIR",
),
opt::opt_s(
"",
"explain",
"Provide a detailed explanation of an error \
message",
"OPT",
),
opt::flag_s("", "test", "Build a test harness"),
opt::opt_s("", "target", "Target triple for which the code is compiled", "TARGET"),
opt::multi_s("A", "allow", "Set lint allowed", "LINT"),
opt::multi_s("W", "warn", "Set lint warnings", "LINT"),
opt::multi_s("", "force-warn", "Set lint force-warn", "LINT"),
opt::multi_s("D", "deny", "Set lint denied", "LINT"),
opt::multi_s("F", "forbid", "Set lint forbidden", "LINT"),
opt::multi_s(
"",
"cap-lints",
"Set the most restrictive lint level. \
More restrictive lints are capped at this \
level",
"LEVEL",
),
opt::multi_s("C", "codegen", "Set a codegen option", "OPT[=VALUE]"),
opt::flag_s("V", "version", "Print version info and exit"),
opt::flag_s("v", "verbose", "Use verbose output"),
]
}
/// Returns all rustc command line options, including metadata for
/// each option, such as whether the option is part of the stable
/// long-term interface for rustc.
pub fn rustc_optgroups() -> Vec<RustcOptGroup> {
let mut opts = rustc_short_optgroups();
// FIXME: none of these descriptions are actually used
opts.extend(vec![
opt::multi_s(
"",
"extern",
"Specify where an external rust library is located",
"NAME[=PATH]",
),
opt::opt_s("", "sysroot", "Override the system root", "PATH"),
opt::multi("Z", "", "Set unstable / perma-unstable options", "FLAG"),
opt::opt_s(
"",
"error-format",
"How errors and other messages are produced",
"human|json|short",
),
opt::multi_s("", "json", "Configure the JSON output of the compiler", "CONFIG"),
opt::opt_s(
"",
"color",
"Configure coloring of output:
auto = colorize, if output goes to a tty (default);
always = always colorize output;
never = never colorize output",
"auto|always|never",
),
opt::opt_s(
"",
"diagnostic-width",
"Inform rustc of the width of the output so that diagnostics can be truncated to fit",
"WIDTH",
),
opt::multi_s(
"",
"remap-path-prefix",
"Remap source names in all output (compiler messages and output files)",
"FROM=TO",
),
]);
opts
}
pub fn get_cmd_lint_options(
handler: &EarlyErrorHandler,
matches: &getopts::Matches,
) -> (Vec<(String, lint::Level)>, bool, Option<lint::Level>) {
let mut lint_opts_with_position = vec![];
let mut describe_lints = false;
for level in [lint::Allow, lint::Warn, lint::ForceWarn(None), lint::Deny, lint::Forbid] {
for (arg_pos, lint_name) in matches.opt_strs_pos(level.as_str()) {
if lint_name == "help" {
describe_lints = true;
} else {
lint_opts_with_position.push((arg_pos, lint_name.replace('-', "_"), level));
}
}
}
lint_opts_with_position.sort_by_key(|x| x.0);
let lint_opts = lint_opts_with_position
.iter()
.cloned()
.map(|(_, lint_name, level)| (lint_name, level))
.collect();
let lint_cap = matches.opt_str("cap-lints").map(|cap| {
lint::Level::from_str(&cap)
.unwrap_or_else(|| handler.early_error(format!("unknown lint level: `{cap}`")))
});
(lint_opts, describe_lints, lint_cap)
}
/// Parses the `--color` flag.
pub fn parse_color(handler: &EarlyErrorHandler, matches: &getopts::Matches) -> ColorConfig {
match matches.opt_str("color").as_deref() {
Some("auto") => ColorConfig::Auto,
Some("always") => ColorConfig::Always,
Some("never") => ColorConfig::Never,
None => ColorConfig::Auto,
Some(arg) => handler.early_error(format!(
"argument for `--color` must be auto, \
always or never (instead was `{arg}`)"
)),
}
}
/// Possible json config files
pub struct JsonConfig {
pub json_rendered: HumanReadableErrorType,
pub json_artifact_notifications: bool,
pub json_unused_externs: JsonUnusedExterns,
pub json_future_incompat: bool,
}
/// Report unused externs in event stream
#[derive(Copy, Clone)]
pub enum JsonUnusedExterns {
/// Do not
No,
/// Report, but do not exit with failure status for deny/forbid
Silent,
/// Report, and also exit with failure status for deny/forbid
Loud,
}
impl JsonUnusedExterns {
pub fn is_enabled(&self) -> bool {
match self {
JsonUnusedExterns::No => false,
JsonUnusedExterns::Loud | JsonUnusedExterns::Silent => true,
}
}
pub fn is_loud(&self) -> bool {
match self {
JsonUnusedExterns::No | JsonUnusedExterns::Silent => false,
JsonUnusedExterns::Loud => true,
}
}
}
/// Parse the `--json` flag.
///
/// The first value returned is how to render JSON diagnostics, and the second
/// is whether or not artifact notifications are enabled.
pub fn parse_json(handler: &EarlyErrorHandler, matches: &getopts::Matches) -> JsonConfig {
let mut json_rendered: fn(ColorConfig) -> HumanReadableErrorType =
HumanReadableErrorType::Default;
let mut json_color = ColorConfig::Never;
let mut json_artifact_notifications = false;
let mut json_unused_externs = JsonUnusedExterns::No;
let mut json_future_incompat = false;
for option in matches.opt_strs("json") {
// For now conservatively forbid `--color` with `--json` since `--json`
// won't actually be emitting any colors and anything colorized is
// embedded in a diagnostic message anyway.
if matches.opt_str("color").is_some() {
handler.early_error("cannot specify the `--color` option with `--json`");
}
for sub_option in option.split(',') {
match sub_option {
"diagnostic-short" => json_rendered = HumanReadableErrorType::Short,
"diagnostic-rendered-ansi" => json_color = ColorConfig::Always,
"artifacts" => json_artifact_notifications = true,
"unused-externs" => json_unused_externs = JsonUnusedExterns::Loud,
"unused-externs-silent" => json_unused_externs = JsonUnusedExterns::Silent,
"future-incompat" => json_future_incompat = true,
s => handler.early_error(format!("unknown `--json` option `{s}`")),
}
}
}
JsonConfig {
json_rendered: json_rendered(json_color),
json_artifact_notifications,
json_unused_externs,
json_future_incompat,
}
}
/// Parses the `--error-format` flag.
pub fn parse_error_format(
handler: &mut EarlyErrorHandler,
matches: &getopts::Matches,
color: ColorConfig,
json_rendered: HumanReadableErrorType,
) -> ErrorOutputType {
// We need the `opts_present` check because the driver will send us Matches
// with only stable options if no unstable options are used. Since error-format
// is unstable, it will not be present. We have to use `opts_present` not
// `opt_present` because the latter will panic.
let error_format = if matches.opts_present(&["error-format".to_owned()]) {
match matches.opt_str("error-format").as_deref() {
None | Some("human") => {
ErrorOutputType::HumanReadable(HumanReadableErrorType::Default(color))
}
Some("human-annotate-rs") => {
ErrorOutputType::HumanReadable(HumanReadableErrorType::AnnotateSnippet(color))
}
Some("json") => ErrorOutputType::Json { pretty: false, json_rendered },
Some("pretty-json") => ErrorOutputType::Json { pretty: true, json_rendered },
Some("short") => ErrorOutputType::HumanReadable(HumanReadableErrorType::Short(color)),
Some(arg) => {
handler.abort_if_error_and_set_error_format(ErrorOutputType::HumanReadable(
HumanReadableErrorType::Default(color),
));
handler.early_error(format!(
"argument for `--error-format` must be `human`, `json` or \
`short` (instead was `{arg}`)"
))
}
}
} else {
ErrorOutputType::HumanReadable(HumanReadableErrorType::Default(color))
};
match error_format {
ErrorOutputType::Json { .. } => {}
// Conservatively require that the `--json` argument is coupled with
// `--error-format=json`. This means that `--json` is specified we
// should actually be emitting JSON blobs.
_ if !matches.opt_strs("json").is_empty() => {
handler.early_error("using `--json` requires also using `--error-format=json`");
}
_ => {}
}
error_format
}
pub fn parse_crate_edition(handler: &EarlyErrorHandler, matches: &getopts::Matches) -> Edition {
let edition = match matches.opt_str("edition") {
Some(arg) => Edition::from_str(&arg).unwrap_or_else(|_| {
handler.early_error(format!(
"argument for `--edition` must be one of: \
{EDITION_NAME_LIST}. (instead was `{arg}`)"
))
}),
None => DEFAULT_EDITION,
};
if !edition.is_stable() && !nightly_options::is_unstable_enabled(matches) {
let is_nightly = nightly_options::match_is_nightly_build(matches);
let msg = if !is_nightly {
format!(
"the crate requires edition {edition}, but the latest edition supported by this Rust version is {LATEST_STABLE_EDITION}"
)
} else {
format!("edition {edition} is unstable and only available with -Z unstable-options")
};
handler.early_error(msg)
}
edition
}
fn check_error_format_stability(
handler: &mut EarlyErrorHandler,
unstable_opts: &UnstableOptions,
error_format: ErrorOutputType,
json_rendered: HumanReadableErrorType,
) {
if !unstable_opts.unstable_options {
if let ErrorOutputType::Json { pretty: true, json_rendered } = error_format {
handler.abort_if_error_and_set_error_format(ErrorOutputType::Json {
pretty: false,
json_rendered,
});
handler.early_error("`--error-format=pretty-json` is unstable");
}
if let ErrorOutputType::HumanReadable(HumanReadableErrorType::AnnotateSnippet(_)) =
error_format
{
handler.abort_if_error_and_set_error_format(ErrorOutputType::Json {
pretty: false,
json_rendered,
});
handler.early_error("`--error-format=human-annotate-rs` is unstable");
}
}
}
fn parse_output_types(
handler: &EarlyErrorHandler,
unstable_opts: &UnstableOptions,
matches: &getopts::Matches,
) -> OutputTypes {
let mut output_types = BTreeMap::new();
if !unstable_opts.parse_only {
for list in matches.opt_strs("emit") {
for output_type in list.split(',') {
let (shorthand, path) = split_out_file_name(output_type);
let output_type = OutputType::from_shorthand(shorthand).unwrap_or_else(|| {
handler.early_error(format!(
"unknown emission type: `{shorthand}` - expected one of: {display}",
display = OutputType::shorthands_display(),
))
});
output_types.insert(output_type, path);
}
}
};
if output_types.is_empty() {
output_types.insert(OutputType::Exe, None);
}
OutputTypes(output_types)
}
fn split_out_file_name(arg: &str) -> (&str, Option<OutFileName>) {
match arg.split_once('=') {
None => (arg, None),
Some((kind, "-")) => (kind, Some(OutFileName::Stdout)),
Some((kind, path)) => (kind, Some(OutFileName::Real(PathBuf::from(path)))),
}
}
fn should_override_cgus_and_disable_thinlto(
handler: &EarlyErrorHandler,
output_types: &OutputTypes,
matches: &getopts::Matches,
mut codegen_units: Option<usize>,
) -> (bool, Option<usize>) {
let mut disable_local_thinlto = false;
// Issue #30063: if user requests LLVM-related output to one
// particular path, disable codegen-units.
let incompatible: Vec<_> = output_types
.0
.iter()
.map(|ot_path| ot_path.0)
.filter(|ot| !ot.is_compatible_with_codegen_units_and_single_output_file())
.map(|ot| ot.shorthand())
.collect();
if !incompatible.is_empty() {
match codegen_units {
Some(n) if n > 1 => {
if matches.opt_present("o") {
for ot in &incompatible {
handler.early_warn(format!(
"`--emit={ot}` with `-o` incompatible with \
`-C codegen-units=N` for N > 1",
));
}
handler.early_warn("resetting to default -C codegen-units=1");
codegen_units = Some(1);
disable_local_thinlto = true;
}
}
_ => {
codegen_units = Some(1);
disable_local_thinlto = true;
}
}
}
if codegen_units == Some(0) {
handler.early_error("value for codegen units must be a positive non-zero integer");
}
(disable_local_thinlto, codegen_units)
}
fn check_thread_count(handler: &EarlyErrorHandler, unstable_opts: &UnstableOptions) {
if unstable_opts.threads == 0 {
handler.early_error("value for threads must be a positive non-zero integer");
}
if unstable_opts.threads > 1 && unstable_opts.fuel.is_some() {
handler.early_error("optimization fuel is incompatible with multiple threads");
}
}
fn collect_print_requests(
handler: &EarlyErrorHandler,
cg: &mut CodegenOptions,
unstable_opts: &mut UnstableOptions,
matches: &getopts::Matches,
) -> Vec<PrintRequest> {
let mut prints = Vec::<PrintRequest>::new();
if cg.target_cpu.as_ref().is_some_and(|s| s == "help") {
prints.push(PrintRequest { kind: PrintKind::TargetCPUs, out: OutFileName::Stdout });
cg.target_cpu = None;
};
if cg.target_feature == "help" {
prints.push(PrintRequest { kind: PrintKind::TargetFeatures, out: OutFileName::Stdout });
cg.target_feature = String::new();
}
const PRINT_KINDS: &[(&str, PrintKind)] = &[
("crate-name", PrintKind::CrateName),
("file-names", PrintKind::FileNames),
("sysroot", PrintKind::Sysroot),
("target-libdir", PrintKind::TargetLibdir),
("cfg", PrintKind::Cfg),
("calling-conventions", PrintKind::CallingConventions),
("target-list", PrintKind::TargetList),
("target-cpus", PrintKind::TargetCPUs),
("target-features", PrintKind::TargetFeatures),
("relocation-models", PrintKind::RelocationModels),
("code-models", PrintKind::CodeModels),
("tls-models", PrintKind::TlsModels),
("native-static-libs", PrintKind::NativeStaticLibs),
("stack-protector-strategies", PrintKind::StackProtectorStrategies),
("target-spec-json", PrintKind::TargetSpec),
("all-target-specs-json", PrintKind::AllTargetSpecs),
("link-args", PrintKind::LinkArgs),
("split-debuginfo", PrintKind::SplitDebuginfo),
("deployment-target", PrintKind::DeploymentTarget),
];
// We disallow reusing the same path in multiple prints, such as `--print
// cfg=output.txt --print link-args=output.txt`, because outputs are printed
// by disparate pieces of the compiler, and keeping track of which files
// need to be overwritten vs appended to is annoying.
let mut printed_paths = FxHashSet::default();
prints.extend(matches.opt_strs("print").into_iter().map(|req| {
let (req, out) = split_out_file_name(&req);
let kind = match PRINT_KINDS.iter().find(|&&(name, _)| name == req) {
Some((_, PrintKind::TargetSpec)) => {
if unstable_opts.unstable_options {
PrintKind::TargetSpec
} else {
handler.early_error(
"the `-Z unstable-options` flag must also be passed to \
enable the target-spec-json print option",
);
}
}
Some((_, PrintKind::AllTargetSpecs)) => {
if unstable_opts.unstable_options {
PrintKind::AllTargetSpecs
} else {
handler.early_error(
"the `-Z unstable-options` flag must also be passed to \
enable the all-target-specs-json print option",
);
}
}
Some(&(_, print_kind)) => print_kind,
None => {
let prints =
PRINT_KINDS.iter().map(|(name, _)| format!("`{name}`")).collect::<Vec<_>>();
let prints = prints.join(", ");
handler.early_error(format!(
"unknown print request `{req}`. Valid print requests are: {prints}"
));
}
};
let out = out.unwrap_or(OutFileName::Stdout);
if let OutFileName::Real(path) = &out {
if !printed_paths.insert(path.clone()) {
handler.early_error(format!(
"cannot print multiple outputs to the same path: {}",
path.display(),
));
}
}
PrintRequest { kind, out }
}));
prints
}
pub fn parse_target_triple(
handler: &EarlyErrorHandler,
matches: &getopts::Matches,
) -> TargetTriple {
match matches.opt_str("target") {
Some(target) if target.ends_with(".json") => {
let path = Path::new(&target);
TargetTriple::from_path(path).unwrap_or_else(|_| {
handler.early_error(format!("target file {path:?} does not exist"))
})
}
Some(target) => TargetTriple::TargetTriple(target),
_ => TargetTriple::from_triple(host_triple()),
}
}
fn parse_opt_level(
handler: &EarlyErrorHandler,
matches: &getopts::Matches,
cg: &CodegenOptions,
) -> OptLevel {
// The `-O` and `-C opt-level` flags specify the same setting, so we want to be able
// to use them interchangeably. However, because they're technically different flags,
// we need to work out manually which should take precedence if both are supplied (i.e.
// the rightmost flag). We do this by finding the (rightmost) position of both flags and
// comparing them. Note that if a flag is not found, its position will be `None`, which
// always compared less than `Some(_)`.
let max_o = matches.opt_positions("O").into_iter().max();
let max_c = matches
.opt_strs_pos("C")
.into_iter()
.flat_map(|(i, s)| {
// NB: This can match a string without `=`.
if let Some("opt-level") = s.split('=').next() { Some(i) } else { None }
})
.max();
if max_o > max_c {
OptLevel::Default
} else {
match cg.opt_level.as_ref() {
"0" => OptLevel::No,
"1" => OptLevel::Less,
"2" => OptLevel::Default,
"3" => OptLevel::Aggressive,
"s" => OptLevel::Size,
"z" => OptLevel::SizeMin,
arg => {
handler.early_error(format!(
"optimization level needs to be \
between 0-3, s or z (instead was `{arg}`)"
));
}
}
}
}
fn select_debuginfo(matches: &getopts::Matches, cg: &CodegenOptions) -> DebugInfo {
let max_g = matches.opt_positions("g").into_iter().max();
let max_c = matches
.opt_strs_pos("C")
.into_iter()
.flat_map(|(i, s)| {
// NB: This can match a string without `=`.
if let Some("debuginfo") = s.split('=').next() { Some(i) } else { None }
})
.max();
if max_g > max_c { DebugInfo::Full } else { cg.debuginfo }
}
fn select_debuginfo_compression(
_handler: &EarlyErrorHandler,
unstable_opts: &UnstableOptions,
) -> DebugInfoCompression {
unstable_opts.debuginfo_compression
}
pub(crate) fn parse_assert_incr_state(
handler: &EarlyErrorHandler,
opt_assertion: &Option<String>,
) -> Option<IncrementalStateAssertion> {
match opt_assertion {
Some(s) if s.as_str() == "loaded" => Some(IncrementalStateAssertion::Loaded),
Some(s) if s.as_str() == "not-loaded" => Some(IncrementalStateAssertion::NotLoaded),
Some(s) => {
handler.early_error(format!("unexpected incremental state assertion value: {s}"))
}
None => None,
}
}
fn parse_native_lib_kind(
handler: &EarlyErrorHandler,
matches: &getopts::Matches,
kind: &str,
) -> (NativeLibKind, Option<bool>) {
let (kind, modifiers) = match kind.split_once(':') {
None => (kind, None),
Some((kind, modifiers)) => (kind, Some(modifiers)),
};
let kind = match kind {
"static" => NativeLibKind::Static { bundle: None, whole_archive: None },
"dylib" => NativeLibKind::Dylib { as_needed: None },
"framework" => NativeLibKind::Framework { as_needed: None },
"link-arg" => {
if !nightly_options::is_unstable_enabled(matches) {
let why = if nightly_options::match_is_nightly_build(matches) {
" and only accepted on the nightly compiler"
} else {
", the `-Z unstable-options` flag must also be passed to use it"
};
handler.early_error(format!("library kind `link-arg` is unstable{why}"))
}
NativeLibKind::LinkArg
}
_ => handler.early_error(format!(
"unknown library kind `{kind}`, expected one of: static, dylib, framework, link-arg"
)),
};
match modifiers {
None => (kind, None),
Some(modifiers) => parse_native_lib_modifiers(handler, kind, modifiers, matches),
}
}
fn parse_native_lib_modifiers(
handler: &EarlyErrorHandler,
mut kind: NativeLibKind,
modifiers: &str,
matches: &getopts::Matches,
) -> (NativeLibKind, Option<bool>) {
let mut verbatim = None;
for modifier in modifiers.split(',') {
let (modifier, value) = match modifier.strip_prefix(['+', '-']) {
Some(m) => (m, modifier.starts_with('+')),
None => handler.early_error(
"invalid linking modifier syntax, expected '+' or '-' prefix \
before one of: bundle, verbatim, whole-archive, as-needed",
),
};
let report_unstable_modifier = || {
if !nightly_options::is_unstable_enabled(matches) {
let why = if nightly_options::match_is_nightly_build(matches) {
" and only accepted on the nightly compiler"
} else {
", the `-Z unstable-options` flag must also be passed to use it"
};
handler.early_error(format!("linking modifier `{modifier}` is unstable{why}"))
}
};
let assign_modifier = |dst: &mut Option<bool>| {
if dst.is_some() {
let msg = format!("multiple `{modifier}` modifiers in a single `-l` option");
handler.early_error(msg)
} else {
*dst = Some(value);
}
};
match (modifier, &mut kind) {
("bundle", NativeLibKind::Static { bundle, .. }) => assign_modifier(bundle),
("bundle", _) => handler.early_error(
"linking modifier `bundle` is only compatible with `static` linking kind",
),
("verbatim", _) => assign_modifier(&mut verbatim),
("whole-archive", NativeLibKind::Static { whole_archive, .. }) => {
assign_modifier(whole_archive)
}
("whole-archive", _) => handler.early_error(
"linking modifier `whole-archive` is only compatible with `static` linking kind",
),
("as-needed", NativeLibKind::Dylib { as_needed })
| ("as-needed", NativeLibKind::Framework { as_needed }) => {
report_unstable_modifier();
assign_modifier(as_needed)
}
("as-needed", _) => handler.early_error(
"linking modifier `as-needed` is only compatible with \
`dylib` and `framework` linking kinds",
),
// Note: this error also excludes the case with empty modifier
// string, like `modifiers = ""`.
_ => handler.early_error(format!(
"unknown linking modifier `{modifier}`, expected one \
of: bundle, verbatim, whole-archive, as-needed"
)),
}
}
(kind, verbatim)
}
fn parse_libs(handler: &EarlyErrorHandler, matches: &getopts::Matches) -> Vec<NativeLib> {
matches
.opt_strs("l")
.into_iter()
.map(|s| {
// Parse string of the form "[KIND[:MODIFIERS]=]lib[:new_name]",
// where KIND is one of "dylib", "framework", "static", "link-arg" and
// where MODIFIERS are a comma separated list of supported modifiers
// (bundle, verbatim, whole-archive, as-needed). Each modifier is prefixed
// with either + or - to indicate whether it is enabled or disabled.
// The last value specified for a given modifier wins.
let (name, kind, verbatim) = match s.split_once('=') {
None => (s, NativeLibKind::Unspecified, None),
Some((kind, name)) => {
let (kind, verbatim) = parse_native_lib_kind(handler, matches, kind);
(name.to_string(), kind, verbatim)
}
};
let (name, new_name) = match name.split_once(':') {
None => (name, None),
Some((name, new_name)) => (name.to_string(), Some(new_name.to_owned())),
};
if name.is_empty() {
handler.early_error("library name must not be empty");
}
NativeLib { name, new_name, kind, verbatim }
})
.collect()
}
pub fn parse_externs(
handler: &EarlyErrorHandler,
matches: &getopts::Matches,
unstable_opts: &UnstableOptions,
) -> Externs {
let is_unstable_enabled = unstable_opts.unstable_options;
let mut externs: BTreeMap<String, ExternEntry> = BTreeMap::new();
for arg in matches.opt_strs("extern") {
let (name, path) = match arg.split_once('=') {
None => (arg, None),
Some((name, path)) => (name.to_string(), Some(Path::new(path))),
};
let (options, name) = match name.split_once(':') {
None => (None, name),
Some((opts, name)) => (Some(opts), name.to_string()),
};
if !crate::utils::is_ascii_ident(&name) {
let mut error = handler.early_struct_error(format!(
"crate name `{name}` passed to `--extern` is not a valid ASCII identifier"
));
let adjusted_name = name.replace('-', "_");
if crate::utils::is_ascii_ident(&adjusted_name) {
error.help(format!(
"consider replacing the dashes with underscores: `{adjusted_name}`"
));
}
error.emit();
}
let path = path.map(|p| CanonicalizedPath::new(p));
let entry = externs.entry(name.to_owned());
use std::collections::btree_map::Entry;
let entry = if let Some(path) = path {
// --extern prelude_name=some_file.rlib
match entry {
Entry::Vacant(vacant) => {
let files = BTreeSet::from_iter(iter::once(path));
vacant.insert(ExternEntry::new(ExternLocation::ExactPaths(files)))
}
Entry::Occupied(occupied) => {
let ext_ent = occupied.into_mut();
match ext_ent {
ExternEntry { location: ExternLocation::ExactPaths(files), .. } => {
files.insert(path);
}
ExternEntry {
location: location @ ExternLocation::FoundInLibrarySearchDirectories,
..
} => {
// Exact paths take precedence over search directories.
let files = BTreeSet::from_iter(iter::once(path));
*location = ExternLocation::ExactPaths(files);
}
}
ext_ent
}
}
} else {
// --extern prelude_name
match entry {
Entry::Vacant(vacant) => {
vacant.insert(ExternEntry::new(ExternLocation::FoundInLibrarySearchDirectories))
}
Entry::Occupied(occupied) => {
// Ignore if already specified.
occupied.into_mut()
}
}
};
let mut is_private_dep = false;
let mut add_prelude = true;
let mut nounused_dep = false;
let mut force = false;
if let Some(opts) = options {
if !is_unstable_enabled {
handler.early_error(
"the `-Z unstable-options` flag must also be passed to \
enable `--extern` options",
);
}
for opt in opts.split(',') {
match opt {
"priv" => is_private_dep = true,
"noprelude" => {
if let ExternLocation::ExactPaths(_) = &entry.location {
add_prelude = false;
} else {
handler.early_error(
"the `noprelude` --extern option requires a file path",
);
}
}
"nounused" => nounused_dep = true,
"force" => force = true,
_ => handler.early_error(format!("unknown --extern option `{opt}`")),
}
}
}
// Crates start out being not private, and go to being private `priv`
// is specified.
entry.is_private_dep |= is_private_dep;
// likewise `nounused`
entry.nounused_dep |= nounused_dep;
// and `force`
entry.force |= force;
// If any flag is missing `noprelude`, then add to the prelude.
entry.add_prelude |= add_prelude;
}
Externs(externs)
}
fn parse_remap_path_prefix(
handler: &EarlyErrorHandler,
matches: &getopts::Matches,
unstable_opts: &UnstableOptions,
) -> Vec<(PathBuf, PathBuf)> {
let mut mapping: Vec<(PathBuf, PathBuf)> = matches
.opt_strs("remap-path-prefix")
.into_iter()
.map(|remap| match remap.rsplit_once('=') {
None => handler.early_error("--remap-path-prefix must contain '=' between FROM and TO"),
Some((from, to)) => (PathBuf::from(from), PathBuf::from(to)),
})
.collect();
match &unstable_opts.remap_cwd_prefix {
Some(to) => match std::env::current_dir() {
Ok(cwd) => mapping.push((cwd, to.clone())),
Err(_) => (),
},
None => (),
};
mapping
}
// JUSTIFICATION: before wrapper fn is available
#[allow(rustc::bad_opt_access)]
pub fn build_session_options(
handler: &mut EarlyErrorHandler,
matches: &getopts::Matches,
) -> Options {
let color = parse_color(handler, matches);
let edition = parse_crate_edition(handler, matches);
let JsonConfig {
json_rendered,
json_artifact_notifications,
json_unused_externs,
json_future_incompat,
} = parse_json(handler, matches);
let error_format = parse_error_format(handler, matches, color, json_rendered);
handler.abort_if_error_and_set_error_format(error_format);
let diagnostic_width = matches.opt_get("diagnostic-width").unwrap_or_else(|_| {
handler.early_error("`--diagnostic-width` must be an positive integer");
});
let unparsed_crate_types = matches.opt_strs("crate-type");
let crate_types = parse_crate_types_from_list(unparsed_crate_types)
.unwrap_or_else(|e| handler.early_error(e));
let mut unstable_opts = UnstableOptions::build(handler, matches);
let (lint_opts, describe_lints, lint_cap) = get_cmd_lint_options(handler, matches);
check_error_format_stability(handler, &unstable_opts, error_format, json_rendered);
if !unstable_opts.unstable_options && json_unused_externs.is_enabled() {
handler.early_error(
"the `-Z unstable-options` flag must also be passed to enable \
the flag `--json=unused-externs`",
);
}
let output_types = parse_output_types(handler, &unstable_opts, matches);
let mut cg = CodegenOptions::build(handler, matches);
let (disable_local_thinlto, mut codegen_units) =
should_override_cgus_and_disable_thinlto(handler, &output_types, matches, cg.codegen_units);
check_thread_count(handler, &unstable_opts);
let incremental = cg.incremental.as_ref().map(PathBuf::from);
let assert_incr_state = parse_assert_incr_state(handler, &unstable_opts.assert_incr_state);
if unstable_opts.profile && incremental.is_some() {
handler.early_error("can't instrument with gcov profiling when compiling incrementally");
}
if unstable_opts.profile {
match codegen_units {
Some(1) => {}
None => codegen_units = Some(1),
Some(_) => handler
.early_error("can't instrument with gcov profiling with multiple codegen units"),
}
}
if cg.profile_generate.enabled() && cg.profile_use.is_some() {
handler.early_error("options `-C profile-generate` and `-C profile-use` are exclusive");
}
if unstable_opts.profile_sample_use.is_some()
&& (cg.profile_generate.enabled() || cg.profile_use.is_some())
{
handler.early_error(
"option `-Z profile-sample-use` cannot be used with `-C profile-generate` or `-C profile-use`",
);
}
// Check for unstable values of `-C symbol-mangling-version`.
// This is what prevents them from being used on stable compilers.
match cg.symbol_mangling_version {
// Stable values:
None | Some(SymbolManglingVersion::V0) => {}
// Unstable values:
Some(SymbolManglingVersion::Legacy) => {
if !unstable_opts.unstable_options {
handler.early_error(
"`-C symbol-mangling-version=legacy` requires `-Z unstable-options`",
);
}
}
}
// Check for unstable values of `-C instrument-coverage`.
// This is what prevents them from being used on stable compilers.
match cg.instrument_coverage {
// Stable values:
InstrumentCoverage::All | InstrumentCoverage::Off => {}
// Unstable values:
InstrumentCoverage::Branch
| InstrumentCoverage::ExceptUnusedFunctions
| InstrumentCoverage::ExceptUnusedGenerics => {
if !unstable_opts.unstable_options {
handler.early_error(
"`-C instrument-coverage=branch` and `-C instrument-coverage=except-*` \
require `-Z unstable-options`",
);
}
}
}
if cg.instrument_coverage != InstrumentCoverage::Off {
if cg.profile_generate.enabled() || cg.profile_use.is_some() {
handler.early_error(
"option `-C instrument-coverage` is not compatible with either `-C profile-use` \
or `-C profile-generate`",
);
}
// `-C instrument-coverage` implies `-C symbol-mangling-version=v0` - to ensure consistent
// and reversible name mangling. Note, LLVM coverage tools can analyze coverage over
// multiple runs, including some changes to source code; so mangled names must be consistent
// across compilations.
match cg.symbol_mangling_version {
None => cg.symbol_mangling_version = Some(SymbolManglingVersion::V0),
Some(SymbolManglingVersion::Legacy) => {
handler.early_warn(
"-C instrument-coverage requires symbol mangling version `v0`, \
but `-C symbol-mangling-version=legacy` was specified",
);
}
Some(SymbolManglingVersion::V0) => {}
}
}
if let Ok(graphviz_font) = std::env::var("RUSTC_GRAPHVIZ_FONT") {
unstable_opts.graphviz_font = graphviz_font;
}
if !cg.embed_bitcode {
match cg.lto {
LtoCli::No | LtoCli::Unspecified => {}
LtoCli::Yes | LtoCli::NoParam | LtoCli::Thin | LtoCli::Fat => {
handler.early_error("options `-C embed-bitcode=no` and `-C lto` are incompatible")
}
}
}
// For testing purposes, until we have more feedback about these options: ensure `-Z
// unstable-options` is required when using the unstable `-C link-self-contained` and `-C
// linker-flavor` options.
if !nightly_options::is_unstable_enabled(matches) {
let uses_unstable_self_contained_option =
cg.link_self_contained.are_unstable_variants_set();
if uses_unstable_self_contained_option {
handler.early_error(
"only `-C link-self-contained` values `y`/`yes`/`on`/`n`/`no`/`off` are stable, \
the `-Z unstable-options` flag must also be passed to use the unstable values",
);
}
if let Some(flavor) = cg.linker_flavor {
if flavor.is_unstable() {
handler.early_error(format!(
"the linker flavor `{}` is unstable, the `-Z unstable-options` \
flag must also be passed to use the unstable values",
flavor.desc()
));
}
}
}
// Check `-C link-self-contained` for consistency: individual components cannot be both enabled
// and disabled at the same time.
if let Some(erroneous_components) = cg.link_self_contained.check_consistency() {
let names: String = erroneous_components
.into_iter()
.map(|c| c.as_str().unwrap())
.intersperse(", ")
.collect();
handler.early_error(format!(
"some `-C link-self-contained` components were both enabled and disabled: {names}"
));
}
let prints = collect_print_requests(handler, &mut cg, &mut unstable_opts, matches);
let cg = cg;
let sysroot_opt = matches.opt_str("sysroot").map(|m| PathBuf::from(&m));
let target_triple = parse_target_triple(handler, matches);
let opt_level = parse_opt_level(handler, matches, &cg);
// The `-g` and `-C debuginfo` flags specify the same setting, so we want to be able
// to use them interchangeably. See the note above (regarding `-O` and `-C opt-level`)
// for more details.
let debug_assertions = cg.debug_assertions.unwrap_or(opt_level == OptLevel::No);
let debuginfo = select_debuginfo(matches, &cg);
let debuginfo_compression: DebugInfoCompression =
select_debuginfo_compression(handler, &unstable_opts);
let mut search_paths = vec![];
for s in &matches.opt_strs("L") {
search_paths.push(SearchPath::from_cli_opt(handler, s));
}
let libs = parse_libs(handler, matches);
let test = matches.opt_present("test");
if !cg.remark.is_empty() && debuginfo == DebugInfo::None {
handler.early_warn("-C remark requires \"-C debuginfo=n\" to show source locations");
}
if cg.remark.is_empty() && unstable_opts.remark_dir.is_some() {
handler.early_warn("using -Z remark-dir without enabling remarks using e.g. -C remark=all");
}
let externs = parse_externs(handler, matches, &unstable_opts);
let crate_name = matches.opt_str("crate-name");
let remap_path_prefix = parse_remap_path_prefix(handler, matches, &unstable_opts);
let pretty = parse_pretty(handler, &unstable_opts);
// query-dep-graph is required if dump-dep-graph is given #106736
if unstable_opts.dump_dep_graph && !unstable_opts.query_dep_graph {
handler.early_error("can't dump dependency graph without `-Z query-dep-graph`");
}
// Try to find a directory containing the Rust `src`, for more details see
// the doc comment on the `real_rust_source_base_dir` field.
let tmp_buf;
let sysroot = match &sysroot_opt {
Some(s) => s,
None => {
tmp_buf = crate::filesearch::get_or_default_sysroot().expect("Failed finding sysroot");
&tmp_buf
}
};
let real_rust_source_base_dir = {
// This is the location used by the `rust-src` `rustup` component.
let mut candidate = sysroot.join("lib/rustlib/src/rust");
if let Ok(metadata) = candidate.symlink_metadata() {
// Replace the symlink rustbuild creates, with its destination.
// We could try to use `fs::canonicalize` instead, but that might
// produce unnecessarily verbose path.
if metadata.file_type().is_symlink() {
if let Ok(symlink_dest) = std::fs::read_link(&candidate) {
candidate = symlink_dest;
}
}
}
// Only use this directory if it has a file we can expect to always find.
candidate.join("library/std/src/lib.rs").is_file().then_some(candidate)
};
let working_dir = std::env::current_dir().unwrap_or_else(|e| {
handler.early_error(format!("Current directory is invalid: {e}"));
});
let remap = file_path_mapping(remap_path_prefix.clone(), &unstable_opts);
let (path, remapped) = remap.map_prefix(&working_dir);
let working_dir = if remapped {
RealFileName::Remapped { virtual_name: path.into_owned(), local_path: Some(working_dir) }
} else {
RealFileName::LocalPath(path.into_owned())
};
Options {
assert_incr_state,
crate_types,
optimize: opt_level,
debuginfo,
debuginfo_compression,
lint_opts,
lint_cap,
describe_lints,
output_types,
search_paths,
maybe_sysroot: sysroot_opt,
target_triple,
test,
incremental,
untracked_state_hash: Default::default(),
unstable_opts,
prints,
cg,
error_format,
diagnostic_width,
externs,
unstable_features: UnstableFeatures::from_environment(crate_name.as_deref()),
crate_name,
libs,
debug_assertions,
actually_rustdoc: false,
resolve_doc_links: ResolveDocLinks::ExportedMetadata,
trimmed_def_paths: TrimmedDefPaths::default(),
cli_forced_codegen_units: codegen_units,
cli_forced_local_thinlto_off: disable_local_thinlto,
remap_path_prefix,
real_rust_source_base_dir,
edition,
json_artifact_notifications,
json_unused_externs,
json_future_incompat,
pretty,
working_dir,
color,
}
}
fn parse_pretty(handler: &EarlyErrorHandler, unstable_opts: &UnstableOptions) -> Option<PpMode> {
use PpMode::*;
let first = match unstable_opts.unpretty.as_deref()? {
"normal" => Source(PpSourceMode::Normal),
"identified" => Source(PpSourceMode::Identified),
"expanded" => Source(PpSourceMode::Expanded),
"expanded,identified" => Source(PpSourceMode::ExpandedIdentified),
"expanded,hygiene" => Source(PpSourceMode::ExpandedHygiene),
"ast-tree" => AstTree,
"ast-tree,expanded" => AstTreeExpanded,
"hir" => Hir(PpHirMode::Normal),
"hir,identified" => Hir(PpHirMode::Identified),
"hir,typed" => Hir(PpHirMode::Typed),
"hir-tree" => HirTree,
"thir-tree" => ThirTree,
"thir-flat" => ThirFlat,
"mir" => Mir,
"mir-cfg" => MirCFG,
name => handler.early_error(format!(
"argument to `unpretty` must be one of `normal`, `identified`, \
`expanded`, `expanded,identified`, `expanded,hygiene`, \
`ast-tree`, `ast-tree,expanded`, `hir`, `hir,identified`, \
`hir,typed`, `hir-tree`, `thir-tree`, `thir-flat`, `mir` or \
`mir-cfg`; got {name}"
)),
};
debug!("got unpretty option: {first:?}");
Some(first)
}
pub fn make_crate_type_option() -> RustcOptGroup {
opt::multi_s(
"",
"crate-type",
"Comma separated list of types of crates
for the compiler to emit",
"[bin|lib|rlib|dylib|cdylib|staticlib|proc-macro]",
)
}
pub fn parse_crate_types_from_list(list_list: Vec<String>) -> Result<Vec<CrateType>, String> {
let mut crate_types: Vec<CrateType> = Vec::new();
for unparsed_crate_type in &list_list {
for part in unparsed_crate_type.split(',') {
let new_part = match part {
"lib" => default_lib_output(),
"rlib" => CrateType::Rlib,
"staticlib" => CrateType::Staticlib,
"dylib" => CrateType::Dylib,
"cdylib" => CrateType::Cdylib,
"bin" => CrateType::Executable,
"proc-macro" => CrateType::ProcMacro,
_ => return Err(format!("unknown crate type: `{part}`")),
};
if !crate_types.contains(&new_part) {
crate_types.push(new_part)
}
}
}
Ok(crate_types)
}
pub mod nightly_options {
use super::{OptionStability, RustcOptGroup};
use crate::EarlyErrorHandler;
use rustc_feature::UnstableFeatures;
pub fn is_unstable_enabled(matches: &getopts::Matches) -> bool {
match_is_nightly_build(matches)
&& matches.opt_strs("Z").iter().any(|x| *x == "unstable-options")
}
pub fn match_is_nightly_build(matches: &getopts::Matches) -> bool {
is_nightly_build(matches.opt_str("crate-name").as_deref())
}
pub fn is_nightly_build(krate: Option<&str>) -> bool {
UnstableFeatures::from_environment(krate).is_nightly_build()
}
pub fn check_nightly_options(
handler: &EarlyErrorHandler,
matches: &getopts::Matches,
flags: &[RustcOptGroup],
) {
let has_z_unstable_option = matches.opt_strs("Z").iter().any(|x| *x == "unstable-options");
let really_allows_unstable_options = match_is_nightly_build(matches);
let mut nightly_options_on_stable = 0;
for opt in flags.iter() {
if opt.stability == OptionStability::Stable {
continue;
}
if !matches.opt_present(opt.name) {
continue;
}
if opt.name != "Z" && !has_z_unstable_option {
handler.early_error(format!(
"the `-Z unstable-options` flag must also be passed to enable \
the flag `{}`",
opt.name
));
}
if really_allows_unstable_options {
continue;
}
match opt.stability {
OptionStability::Unstable => {
nightly_options_on_stable += 1;
let msg = format!(
"the option `{}` is only accepted on the nightly compiler",
opt.name
);
let _ = handler.early_error_no_abort(msg);
}
OptionStability::Stable => {}
}
}
if nightly_options_on_stable > 0 {
handler
.early_help("consider switching to a nightly toolchain: `rustup default nightly`");
handler.early_note("selecting a toolchain with `+toolchain` arguments require a rustup proxy; see <https://rust-lang.github.io/rustup/concepts/index.html>");
handler.early_note("for more information about Rust's stability policy, see <https://doc.rust-lang.org/book/appendix-07-nightly-rust.html#unstable-features>");
handler.early_error(format!(
"{} nightly option{} were parsed",
nightly_options_on_stable,
if nightly_options_on_stable > 1 { "s" } else { "" }
));
}
}
}
impl fmt::Display for CrateType {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
CrateType::Executable => "bin".fmt(f),
CrateType::Dylib => "dylib".fmt(f),
CrateType::Rlib => "rlib".fmt(f),
CrateType::Staticlib => "staticlib".fmt(f),
CrateType::Cdylib => "cdylib".fmt(f),
CrateType::ProcMacro => "proc-macro".fmt(f),
}
}
}
impl IntoDiagnosticArg for CrateType {
fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
self.to_string().into_diagnostic_arg()
}
}
#[derive(Copy, Clone, PartialEq, Debug)]
pub enum PpSourceMode {
/// `-Zunpretty=normal`
Normal,
/// `-Zunpretty=expanded`
Expanded,
/// `-Zunpretty=identified`
Identified,
/// `-Zunpretty=expanded,identified`
ExpandedIdentified,
/// `-Zunpretty=expanded,hygiene`
ExpandedHygiene,
}
#[derive(Copy, Clone, PartialEq, Debug)]
pub enum PpHirMode {
/// `-Zunpretty=hir`
Normal,
/// `-Zunpretty=hir,identified`
Identified,
/// `-Zunpretty=hir,typed`
Typed,
}
#[derive(Copy, Clone, PartialEq, Debug)]
pub enum PpMode {
/// Options that print the source code, i.e.
/// `-Zunpretty=normal` and `-Zunpretty=expanded`
Source(PpSourceMode),
/// `-Zunpretty=ast-tree`
AstTree,
/// `-Zunpretty=ast-tree,expanded`
AstTreeExpanded,
/// Options that print the HIR, i.e. `-Zunpretty=hir`
Hir(PpHirMode),
/// `-Zunpretty=hir-tree`
HirTree,
/// `-Zunpretty=thir-tree`
ThirTree,
/// `-Zunpretty=thir-flat`
ThirFlat,
/// `-Zunpretty=mir`
Mir,
/// `-Zunpretty=mir-cfg`
MirCFG,
}
impl PpMode {
pub fn needs_ast_map(&self) -> bool {
use PpMode::*;
use PpSourceMode::*;
match *self {
Source(Normal | Identified) | AstTree => false,
Source(Expanded | ExpandedIdentified | ExpandedHygiene)
| AstTreeExpanded
| Hir(_)
| HirTree
| ThirTree
| ThirFlat
| Mir
| MirCFG => true,
}
}
pub fn needs_hir(&self) -> bool {
use PpMode::*;
match *self {
Source(_) | AstTree | AstTreeExpanded => false,
Hir(_) | HirTree | ThirTree | ThirFlat | Mir | MirCFG => true,
}
}
pub fn needs_analysis(&self) -> bool {
use PpMode::*;
matches!(*self, Hir(PpHirMode::Typed) | Mir | MirCFG | ThirTree | ThirFlat)
}
}
/// Command-line arguments passed to the compiler have to be incorporated with
/// the dependency tracking system for incremental compilation. This module
/// provides some utilities to make this more convenient.
///
/// The values of all command-line arguments that are relevant for dependency
/// tracking are hashed into a single value that determines whether the
/// incremental compilation cache can be re-used or not. This hashing is done
/// via the `DepTrackingHash` trait defined below, since the standard `Hash`
/// implementation might not be suitable (e.g., arguments are stored in a `Vec`,
/// the hash of which is order dependent, but we might not want the order of
/// arguments to make a difference for the hash).
///
/// However, since the value provided by `Hash::hash` often *is* suitable,
/// especially for primitive types, there is the
/// `impl_dep_tracking_hash_via_hash!()` macro that allows to simply reuse the
/// `Hash` implementation for `DepTrackingHash`. It's important though that
/// we have an opt-in scheme here, so one is hopefully forced to think about
/// how the hash should be calculated when adding a new command-line argument.
pub(crate) mod dep_tracking {
use super::{
BranchProtection, CFGuard, CFProtection, CrateType, DebugInfo, DebugInfoCompression,
ErrorOutputType, InliningThreshold, InstrumentCoverage, InstrumentXRay, LinkerPluginLto,
LocationDetail, LtoCli, OomStrategy, OptLevel, OutFileName, OutputType, OutputTypes,
Polonius, RemapPathScopeComponents, ResolveDocLinks, SourceFileHashAlgorithm,
SplitDwarfKind, SwitchWithOptPath, SymbolManglingVersion, TraitSolver, TrimmedDefPaths,
};
use crate::lint;
use crate::options::WasiExecModel;
use crate::utils::NativeLib;
use rustc_data_structures::stable_hasher::Hash64;
use rustc_errors::LanguageIdentifier;
use rustc_feature::UnstableFeatures;
use rustc_span::edition::Edition;
use rustc_span::RealFileName;
use rustc_target::spec::{CodeModel, MergeFunctions, PanicStrategy, RelocModel};
use rustc_target::spec::{
RelroLevel, SanitizerSet, SplitDebuginfo, StackProtector, TargetTriple, TlsModel,
};
use std::collections::hash_map::DefaultHasher;
use std::collections::BTreeMap;
use std::hash::Hash;
use std::num::NonZeroUsize;
use std::path::PathBuf;
pub trait DepTrackingHash {
fn hash(
&self,
hasher: &mut DefaultHasher,
error_format: ErrorOutputType,
for_crate_hash: bool,
);
}
macro_rules! impl_dep_tracking_hash_via_hash {
($($t:ty),+ $(,)?) => {$(
impl DepTrackingHash for $t {
fn hash(&self, hasher: &mut DefaultHasher, _: ErrorOutputType, _for_crate_hash: bool) {
Hash::hash(self, hasher);
}
}
)+};
}
impl<T: DepTrackingHash> DepTrackingHash for Option<T> {
fn hash(
&self,
hasher: &mut DefaultHasher,
error_format: ErrorOutputType,
for_crate_hash: bool,
) {
match self {
Some(x) => {
Hash::hash(&1, hasher);
DepTrackingHash::hash(x, hasher, error_format, for_crate_hash);
}
None => Hash::hash(&0, hasher),
}
}
}
impl_dep_tracking_hash_via_hash!(
bool,
usize,
NonZeroUsize,
u64,
Hash64,
String,
PathBuf,
lint::Level,
WasiExecModel,
u32,
RelocModel,
CodeModel,
TlsModel,
InstrumentCoverage,
InstrumentXRay,
CrateType,
MergeFunctions,
PanicStrategy,
RelroLevel,
OptLevel,
LtoCli,
DebugInfo,
DebugInfoCompression,
UnstableFeatures,
NativeLib,
SanitizerSet,
CFGuard,
CFProtection,
TargetTriple,
Edition,
LinkerPluginLto,
ResolveDocLinks,
SplitDebuginfo,
SplitDwarfKind,
StackProtector,
SwitchWithOptPath,
SymbolManglingVersion,
RemapPathScopeComponents,
SourceFileHashAlgorithm,
TrimmedDefPaths,
OutFileName,
OutputType,
RealFileName,
LocationDetail,
BranchProtection,
OomStrategy,
LanguageIdentifier,
TraitSolver,
Polonius,
InliningThreshold,
);
impl<T1, T2> DepTrackingHash for (T1, T2)
where
T1: DepTrackingHash,
T2: DepTrackingHash,
{
fn hash(
&self,
hasher: &mut DefaultHasher,
error_format: ErrorOutputType,
for_crate_hash: bool,
) {
Hash::hash(&0, hasher);
DepTrackingHash::hash(&self.0, hasher, error_format, for_crate_hash);
Hash::hash(&1, hasher);
DepTrackingHash::hash(&self.1, hasher, error_format, for_crate_hash);
}
}
impl<T1, T2, T3> DepTrackingHash for (T1, T2, T3)
where
T1: DepTrackingHash,
T2: DepTrackingHash,
T3: DepTrackingHash,
{
fn hash(
&self,
hasher: &mut DefaultHasher,
error_format: ErrorOutputType,
for_crate_hash: bool,
) {
Hash::hash(&0, hasher);
DepTrackingHash::hash(&self.0, hasher, error_format, for_crate_hash);
Hash::hash(&1, hasher);
DepTrackingHash::hash(&self.1, hasher, error_format, for_crate_hash);
Hash::hash(&2, hasher);
DepTrackingHash::hash(&self.2, hasher, error_format, for_crate_hash);
}
}
impl<T: DepTrackingHash> DepTrackingHash for Vec<T> {
fn hash(
&self,
hasher: &mut DefaultHasher,
error_format: ErrorOutputType,
for_crate_hash: bool,
) {
Hash::hash(&self.len(), hasher);
for (index, elem) in self.iter().enumerate() {
Hash::hash(&index, hasher);
DepTrackingHash::hash(elem, hasher, error_format, for_crate_hash);
}
}
}
impl DepTrackingHash for OutputTypes {
fn hash(
&self,
hasher: &mut DefaultHasher,
error_format: ErrorOutputType,
for_crate_hash: bool,
) {
Hash::hash(&self.0.len(), hasher);
for (key, val) in &self.0 {
DepTrackingHash::hash(key, hasher, error_format, for_crate_hash);
if !for_crate_hash {
DepTrackingHash::hash(val, hasher, error_format, for_crate_hash);
}
}
}
}
// This is a stable hash because BTreeMap is a sorted container
pub(crate) fn stable_hash(
sub_hashes: BTreeMap<&'static str, &dyn DepTrackingHash>,
hasher: &mut DefaultHasher,
error_format: ErrorOutputType,
for_crate_hash: bool,
) {
for (key, sub_hash) in sub_hashes {
// Using Hash::hash() instead of DepTrackingHash::hash() is fine for
// the keys, as they are just plain strings
Hash::hash(&key.len(), hasher);
Hash::hash(key, hasher);
sub_hash.hash(hasher, error_format, for_crate_hash);
}
}
}
/// Default behavior to use in out-of-memory situations.
#[derive(Clone, Copy, PartialEq, Hash, Debug, Encodable, Decodable, HashStable_Generic)]
pub enum OomStrategy {
/// Generate a panic that can be caught by `catch_unwind`.
Panic,
/// Abort the process immediately.
Abort,
}
impl OomStrategy {
pub const SYMBOL: &'static str = "__rust_alloc_error_handler_should_panic";
pub fn should_panic(self) -> u8 {
match self {
OomStrategy::Panic => 1,
OomStrategy::Abort => 0,
}
}
}
/// How to run proc-macro code when building this crate
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum ProcMacroExecutionStrategy {
/// Run the proc-macro code on the same thread as the server.
SameThread,
/// Run the proc-macro code on a different thread.
CrossThread,
}
/// Which format to use for `-Z dump-mono-stats`
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum DumpMonoStatsFormat {
/// Pretty-print a markdown table
Markdown,
/// Emit structured JSON
Json,
}
impl DumpMonoStatsFormat {
pub fn extension(self) -> &'static str {
match self {
Self::Markdown => "md",
Self::Json => "json",
}
}
}
/// `-Zpolonius` values, enabling the borrow checker polonius analysis, and which version: legacy,
/// or future prototype.
#[derive(Clone, Copy, PartialEq, Hash, Debug, Default)]
pub enum Polonius {
/// The default value: disabled.
#[default]
Off,
/// Legacy version, using datalog and the `polonius-engine` crate. Historical value for `-Zpolonius`.
Legacy,
/// In-tree prototype, extending the NLL infrastructure.
Next,
}
impl Polonius {
/// Returns whether the legacy version of polonius is enabled
pub fn is_legacy_enabled(&self) -> bool {
matches!(self, Polonius::Legacy)
}
/// Returns whether the "next" version of polonius is enabled
pub fn is_next_enabled(&self) -> bool {
matches!(self, Polonius::Next)
}
}
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum InliningThreshold {
Always,
Sometimes(usize),
Never,
}
impl Default for InliningThreshold {
fn default() -> Self {
Self::Sometimes(100)
}
}