compiler/rustc_interface/src/interface.rs

   1 pub use crate::passes::BoxedResolver;
   2 use crate::util;
   3
   4 use rustc_ast::token;
   5 use rustc_ast::{self as ast, LitKind, MetaItemKind};
   6 use rustc_codegen_ssa::traits::CodegenBackend;
   7 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
   8 use rustc_data_structures::sync::Lrc;
   9 use rustc_data_structures::OnDrop;
  10 use rustc_errors::registry::Registry;
  11 use rustc_errors::{ErrorGuaranteed, Handler};
  12 use rustc_lint::LintStore;
  13 use rustc_middle::ty;
  14 use rustc_parse::maybe_new_parser_from_source_str;
  15 use rustc_query_impl::QueryCtxt;
  16 use rustc_session::config::{self, CheckCfg, ErrorOutputType, Input, OutputFilenames};
  17 use rustc_session::early_error;
  18 use rustc_session::lint;
  19 use rustc_session::parse::{CrateConfig, ParseSess};
  20 use rustc_session::Session;
  21 use rustc_span::source_map::{FileLoader, FileName};
  22 use rustc_span::symbol::sym;
  23 use std::path::PathBuf;
  24 use std::result;
  25
  26 pub type Result<T> = result::Result<T, ErrorGuaranteed>;
  27
  28 /// Represents a compiler session. Note that every `Compiler` contains a
  29 /// `Session`, but `Compiler` also contains some things that cannot be in
  30 /// `Session`, due to `Session` being in a crate that has many fewer
  31 /// dependencies than this crate.
  32 ///
  33 /// Can be used to run `rustc_interface` queries.
  34 /// Created by passing [`Config`] to [`run_compiler`].
  35 pub struct Compiler {
  36     pub(crate) sess: Lrc<Session>,
  37     codegen_backend: Lrc<Box<dyn CodegenBackend>>,
  38     pub(crate) input: Input,
  39     pub(crate) input_path: Option<PathBuf>,
  40     pub(crate) output_dir: Option<PathBuf>,
  41     pub(crate) output_file: Option<PathBuf>,
  42     pub(crate) temps_dir: Option<PathBuf>,
  43     pub(crate) register_lints: Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>,
  44     pub(crate) override_queries:
  45         Option<fn(&Session, &mut ty::query::Providers, &mut ty::query::ExternProviders)>,
  46 }
  47
  48 impl Compiler {
  49     pub fn session(&self) -> &Lrc<Session> {
  50         &self.sess
  51     }
  52     pub fn codegen_backend(&self) -> &Lrc<Box<dyn CodegenBackend>> {
  53         &self.codegen_backend
  54     }
  55     pub fn input(&self) -> &Input {
  56         &self.input
  57     }
  58     pub fn output_dir(&self) -> &Option<PathBuf> {
  59         &self.output_dir
  60     }
  61     pub fn output_file(&self) -> &Option<PathBuf> {
  62         &self.output_file
  63     }
  64     pub fn temps_dir(&self) -> &Option<PathBuf> {
  65         &self.temps_dir
  66     }
  67     pub fn register_lints(&self) -> &Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>> {
  68         &self.register_lints
  69     }
  70     pub fn build_output_filenames(
  71         &self,
  72         sess: &Session,
  73         attrs: &[ast::Attribute],
  74     ) -> OutputFilenames {
  75         util::build_output_filenames(
  76             &self.input,
  77             &self.output_dir,
  78             &self.output_file,
  79             &self.temps_dir,
  80             attrs,
  81             sess,
  82         )
  83     }
  84 }
  85
  86 /// Converts strings provided as `--cfg [cfgspec]` into a `crate_cfg`.
  87 pub fn parse_cfgspecs(cfgspecs: Vec<String>) -> FxHashSet<(String, Option<String>)> {
  88     rustc_span::create_default_session_if_not_set_then(move |_| {
  89         let cfg = cfgspecs
  90             .into_iter()
  91             .map(|s| {
  92                 let sess = ParseSess::with_silent_emitter(Some(format!(
  93                     "this error occurred on the command line: `--cfg={}`",
  94                     s
  95                 )));
  96                 let filename = FileName::cfg_spec_source_code(&s);
  97
  98                 macro_rules! error {
  99                     ($reason: expr) => {
 100                         early_error(
 101                             ErrorOutputType::default(),
 102                             &format!(concat!("invalid `--cfg` argument: `{}` (", $reason, ")"), s),
 103                         );
 104                     };
 105                 }
 106
 107                 match maybe_new_parser_from_source_str(&sess, filename, s.to_string()) {
 108                     Ok(mut parser) => match parser.parse_meta_item() {
 109                         Ok(meta_item) if parser.token == token::Eof => {
 110                             if meta_item.path.segments.len() != 1 {
 111                                 error!("argument key must be an identifier");
 112                             }
 113                             match &meta_item.kind {
 114                                 MetaItemKind::List(..) => {}
 115                                 MetaItemKind::NameValue(lit) if !lit.kind.is_str() => {
 116                                     error!("argument value must be a string");
 117                                 }
 118                                 MetaItemKind::NameValue(..) | MetaItemKind::Word => {
 119                                     let ident = meta_item.ident().expect("multi-segment cfg key");
 120                                     return (ident.name, meta_item.value_str());
 121                                 }
 122                             }
 123                         }
 124                         Ok(..) => {}
 125                         Err(err) => err.cancel(),
 126                     },
 127                     Err(errs) => drop(errs),
 128                 }
 129
 130                 // If the user tried to use a key="value" flag, but is missing the quotes, provide
 131                 // a hint about how to resolve this.
 132                 if s.contains('=') && !s.contains("=\"") && !s.ends_with('"') {
 133                     error!(concat!(
 134                         r#"expected `key` or `key="value"`, ensure escaping is appropriate"#,
 135                         r#" for your shell, try 'key="value"' or key=\"value\""#
 136                     ));
 137                 } else {
 138                     error!(r#"expected `key` or `key="value"`"#);
 139                 }
 140             })
 141             .collect::<CrateConfig>();
 142         cfg.into_iter().map(|(a, b)| (a.to_string(), b.map(|b| b.to_string()))).collect()
 143     })
 144 }
 145
 146 /// Converts strings provided as `--check-cfg [specs]` into a `CheckCfg`.
 147 pub fn parse_check_cfg(specs: Vec<String>) -> CheckCfg {
 148     rustc_span::create_default_session_if_not_set_then(move |_| {
 149         let mut cfg = CheckCfg::default();
 150
 151         'specs: for s in specs {
 152             let sess = ParseSess::with_silent_emitter(Some(format!(
 153                 "this error occurred on the command line: `--check-cfg={}`",
 154                 s
 155             )));
 156             let filename = FileName::cfg_spec_source_code(&s);
 157
 158             macro_rules! error {
 159                 ($reason: expr) => {
 160                     early_error(
 161                         ErrorOutputType::default(),
 162                         &format!(
 163                             concat!("invalid `--check-cfg` argument: `{}` (", $reason, ")"),
 164                             s
 165                         ),
 166                     );
 167                 };
 168             }
 169
 170             match maybe_new_parser_from_source_str(&sess, filename, s.to_string()) {
 171                 Ok(mut parser) => match parser.parse_meta_item() {
 172                     Ok(meta_item) if parser.token == token::Eof => {
 173                         if let Some(args) = meta_item.meta_item_list() {
 174                             if meta_item.has_name(sym::names) {
 175                                 let names_valid =
 176                                     cfg.names_valid.get_or_insert_with(|| FxHashSet::default());
 177                                 for arg in args {
 178                                     if arg.is_word() && arg.ident().is_some() {
 179                                         let ident = arg.ident().expect("multi-segment cfg key");
 180                                         names_valid.insert(ident.name.to_string());
 181                                     } else {
 182                                         error!("`names()` arguments must be simple identifiers");
 183                                     }
 184                                 }
 185                                 continue 'specs;
 186                             } else if meta_item.has_name(sym::values) {
 187                                 if let Some((name, values)) = args.split_first() {
 188                                     if name.is_word() && name.ident().is_some() {
 189                                         let ident = name.ident().expect("multi-segment cfg key");
 190                                         let ident_values = cfg
 191                                             .values_valid
 192                                             .entry(ident.name.to_string())
 193                                             .or_insert_with(|| FxHashSet::default());
 194
 195                                         for val in values {
 196                                             if let Some(LitKind::Str(s, _)) =
 197                                                 val.literal().map(|lit| &lit.kind)
 198                                             {
 199                                                 ident_values.insert(s.to_string());
 200                                             } else {
 201                                                 error!(
 202                                                     "`values()` arguments must be string literals"
 203                                                 );
 204                                             }
 205                                         }
 206
 207                                         continue 'specs;
 208                                     } else {
 209                                         error!(
 210                                             "`values()` first argument must be a simple identifier"
 211                                         );
 212                                     }
 213                                 } else if args.is_empty() {
 214                                     cfg.well_known_values = true;
 215                                     continue 'specs;
 216                                 }
 217                             }
 218                         }
 219                     }
 220                     Ok(..) => {}
 221                     Err(err) => err.cancel(),
 222                 },
 223                 Err(errs) => drop(errs),
 224             }
 225
 226             error!(
 227                 "expected `names(name1, name2, ... nameN)` or \
 228                 `values(name, \"value1\", \"value2\", ... \"valueN\")`"
 229             );
 230         }
 231
 232         if let Some(names_valid) = &mut cfg.names_valid {
 233             names_valid.extend(cfg.values_valid.keys().cloned());
 234         }
 235         cfg
 236     })
 237 }
 238
 239 /// The compiler configuration
 240 pub struct Config {
 241     /// Command line options
 242     pub opts: config::Options,
 243
 244     /// cfg! configuration in addition to the default ones
 245     pub crate_cfg: FxHashSet<(String, Option<String>)>,
 246     pub crate_check_cfg: CheckCfg,
 247
 248     pub input: Input,
 249     pub input_path: Option<PathBuf>,
 250     pub output_dir: Option<PathBuf>,
 251     pub output_file: Option<PathBuf>,
 252     pub file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
 253
 254     pub lint_caps: FxHashMap<lint::LintId, lint::Level>,
 255
 256     /// This is a callback from the driver that is called when [`ParseSess`] is created.
 257     pub parse_sess_created: Option<Box<dyn FnOnce(&mut ParseSess) + Send>>,
 258
 259     /// This is a callback from the driver that is called when we're registering lints;
 260     /// it is called during plugin registration when we have the LintStore in a non-shared state.
 261     ///
 262     /// Note that if you find a Some here you probably want to call that function in the new
 263     /// function being registered.
 264     pub register_lints: Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>,
 265
 266     /// This is a callback from the driver that is called just after we have populated
 267     /// the list of queries.
 268     ///
 269     /// The second parameter is local providers and the third parameter is external providers.
 270     pub override_queries:
 271         Option<fn(&Session, &mut ty::query::Providers, &mut ty::query::ExternProviders)>,
 272
 273     /// This is a callback from the driver that is called to create a codegen backend.
 274     pub make_codegen_backend:
 275         Option<Box<dyn FnOnce(&config::Options) -> Box<dyn CodegenBackend> + Send>>,
 276
 277     /// Registry of diagnostics codes.
 278     pub registry: Registry,
 279 }
 280
 281 // JUSTIFICATION: before session exists, only config
 282 #[allow(rustc::bad_opt_access)]
 283 pub fn run_compiler<R: Send>(config: Config, f: impl FnOnce(&Compiler) -> R + Send) -> R {
 284     trace!("run_compiler");
 285     util::run_in_thread_pool_with_globals(
 286         config.opts.edition,
 287         config.opts.unstable_opts.threads,
 288         || {
 289             crate::callbacks::setup_callbacks();
 290
 291             let registry = &config.registry;
 292             let (mut sess, codegen_backend) = util::create_session(
 293                 config.opts,
 294                 config.crate_cfg,
 295                 config.crate_check_cfg,
 296                 config.file_loader,
 297                 config.input_path.clone(),
 298                 config.lint_caps,
 299                 config.make_codegen_backend,
 300                 registry.clone(),
 301             );
 302
 303             if let Some(parse_sess_created) = config.parse_sess_created {
 304                 parse_sess_created(&mut sess.parse_sess);
 305             }
 306
 307             let temps_dir = sess.opts.unstable_opts.temps_dir.as_ref().map(|o| PathBuf::from(&o));
 308
 309             let compiler = Compiler {
 310                 sess: Lrc::new(sess),
 311                 codegen_backend: Lrc::new(codegen_backend),
 312                 input: config.input,
 313                 input_path: config.input_path,
 314                 output_dir: config.output_dir,
 315                 output_file: config.output_file,
 316                 temps_dir,
 317                 register_lints: config.register_lints,
 318                 override_queries: config.override_queries,
 319             };
 320
 321             rustc_span::with_source_map(compiler.sess.parse_sess.clone_source_map(), move || {
 322                 let r = {
 323                     let _sess_abort_error = OnDrop(|| {
 324                         compiler.sess.finish_diagnostics(registry);
 325                     });
 326
 327                     f(&compiler)
 328                 };
 329
 330                 let prof = compiler.sess.prof.clone();
 331                 prof.generic_activity("drop_compiler").run(move || drop(compiler));
 332                 r
 333             })
 334         },
 335     )
 336 }
 337
 338 pub fn try_print_query_stack(handler: &Handler, num_frames: Option<usize>) {
 339     eprintln!("query stack during panic:");
 340
 341     // Be careful relying on global state here: this code is called from
 342     // a panic hook, which means that the global `Handler` may be in a weird
 343     // state if it was responsible for triggering the panic.
 344     let i = ty::tls::with_context_opt(|icx| {
 345         if let Some(icx) = icx {
 346             QueryCtxt::from_tcx(icx.tcx).try_print_query_stack(icx.query, handler, num_frames)
 347         } else {
 348             0
 349         }
 350     });
 351
 352     if num_frames == None || num_frames >= Some(i) {
 353         eprintln!("end of query stack");
 354     } else {
 355         eprintln!("we're just showing a limited slice of the query stack");
 356     }
 357 }