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::{DiagnosticOutput, 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.
  29 ///
  30 /// Can be used to run `rustc_interface` queries.
  31 /// Created by passing [`Config`] to [`run_compiler`].
  32 pub struct Compiler {
  33     pub(crate) sess: Lrc<Session>,
  34     codegen_backend: Lrc<Box<dyn CodegenBackend>>,
  35     pub(crate) input: Input,
  36     pub(crate) input_path: Option<PathBuf>,
  37     pub(crate) output_dir: Option<PathBuf>,
  38     pub(crate) output_file: Option<PathBuf>,
  39     pub(crate) temps_dir: Option<PathBuf>,
  40     pub(crate) register_lints: Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>,
  41     pub(crate) override_queries:
  42         Option<fn(&Session, &mut ty::query::Providers, &mut ty::query::ExternProviders)>,
  43 }
  44
  45 impl Compiler {
  46     pub fn session(&self) -> &Lrc<Session> {
  47         &self.sess
  48     }
  49     pub fn codegen_backend(&self) -> &Lrc<Box<dyn CodegenBackend>> {
  50         &self.codegen_backend
  51     }
  52     pub fn input(&self) -> &Input {
  53         &self.input
  54     }
  55     pub fn output_dir(&self) -> &Option<PathBuf> {
  56         &self.output_dir
  57     }
  58     pub fn output_file(&self) -> &Option<PathBuf> {
  59         &self.output_file
  60     }
  61     pub fn temps_dir(&self) -> &Option<PathBuf> {
  62         &self.temps_dir
  63     }
  64     pub fn register_lints(&self) -> &Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>> {
  65         &self.register_lints
  66     }
  67     pub fn build_output_filenames(
  68         &self,
  69         sess: &Session,
  70         attrs: &[ast::Attribute],
  71     ) -> OutputFilenames {
  72         util::build_output_filenames(
  73             &self.input,
  74             &self.output_dir,
  75             &self.output_file,
  76             &self.temps_dir,
  77             attrs,
  78             sess,
  79         )
  80     }
  81 }
  82
  83 /// Converts strings provided as `--cfg [cfgspec]` into a `crate_cfg`.
  84 pub fn parse_cfgspecs(cfgspecs: Vec<String>) -> FxHashSet<(String, Option<String>)> {
  85     rustc_span::create_default_session_if_not_set_then(move |_| {
  86         let cfg = cfgspecs
  87             .into_iter()
  88             .map(|s| {
  89                 let sess = ParseSess::with_silent_emitter(Some(format!(
  90                     "this error occurred on the command line: `--cfg={}`",
  91                     s
  92                 )));
  93                 let filename = FileName::cfg_spec_source_code(&s);
  94
  95                 macro_rules! error {
  96                     ($reason: expr) => {
  97                         early_error(
  98                             ErrorOutputType::default(),
  99                             &format!(concat!("invalid `--cfg` argument: `{}` (", $reason, ")"), s),
 100                         );
 101                     };
 102                 }
 103
 104                 match maybe_new_parser_from_source_str(&sess, filename, s.to_string()) {
 105                     Ok(mut parser) => match parser.parse_meta_item() {
 106                         Ok(meta_item) if parser.token == token::Eof => {
 107                             if meta_item.path.segments.len() != 1 {
 108                                 error!("argument key must be an identifier");
 109                             }
 110                             match &meta_item.kind {
 111                                 MetaItemKind::List(..) => {}
 112                                 MetaItemKind::NameValue(lit) if !lit.kind.is_str() => {
 113                                     error!("argument value must be a string");
 114                                 }
 115                                 MetaItemKind::NameValue(..) | MetaItemKind::Word => {
 116                                     let ident = meta_item.ident().expect("multi-segment cfg key");
 117                                     return (ident.name, meta_item.value_str());
 118                                 }
 119                             }
 120                         }
 121                         Ok(..) => {}
 122                         Err(err) => err.cancel(),
 123                     },
 124                     Err(errs) => drop(errs),
 125                 }
 126
 127                 // If the user tried to use a key="value" flag, but is missing the quotes, provide
 128                 // a hint about how to resolve this.
 129                 if s.contains('=') && !s.contains("=\"") && !s.ends_with('"') {
 130                     error!(concat!(
 131                         r#"expected `key` or `key="value"`, ensure escaping is appropriate"#,
 132                         r#" for your shell, try 'key="value"' or key=\"value\""#
 133                     ));
 134                 } else {
 135                     error!(r#"expected `key` or `key="value"`"#);
 136                 }
 137             })
 138             .collect::<CrateConfig>();
 139         cfg.into_iter().map(|(a, b)| (a.to_string(), b.map(|b| b.to_string()))).collect()
 140     })
 141 }
 142
 143 /// Converts strings provided as `--check-cfg [specs]` into a `CheckCfg`.
 144 pub fn parse_check_cfg(specs: Vec<String>) -> CheckCfg {
 145     rustc_span::create_default_session_if_not_set_then(move |_| {
 146         let mut cfg = CheckCfg::default();
 147
 148         'specs: for s in specs {
 149             let sess = ParseSess::with_silent_emitter(Some(format!(
 150                 "this error occurred on the command line: `--check-cfg={}`",
 151                 s
 152             )));
 153             let filename = FileName::cfg_spec_source_code(&s);
 154
 155             macro_rules! error {
 156                 ($reason: expr) => {
 157                     early_error(
 158                         ErrorOutputType::default(),
 159                         &format!(
 160                             concat!("invalid `--check-cfg` argument: `{}` (", $reason, ")"),
 161                             s
 162                         ),
 163                     );
 164                 };
 165             }
 166
 167             match maybe_new_parser_from_source_str(&sess, filename, s.to_string()) {
 168                 Ok(mut parser) => match parser.parse_meta_item() {
 169                     Ok(meta_item) if parser.token == token::Eof => {
 170                         if let Some(args) = meta_item.meta_item_list() {
 171                             if meta_item.has_name(sym::names) {
 172                                 let names_valid =
 173                                     cfg.names_valid.get_or_insert_with(|| FxHashSet::default());
 174                                 for arg in args {
 175                                     if arg.is_word() && arg.ident().is_some() {
 176                                         let ident = arg.ident().expect("multi-segment cfg key");
 177                                         names_valid.insert(ident.name.to_string());
 178                                     } else {
 179                                         error!("`names()` arguments must be simple identifers");
 180                                     }
 181                                 }
 182                                 continue 'specs;
 183                             } else if meta_item.has_name(sym::values) {
 184                                 if let Some((name, values)) = args.split_first() {
 185                                     if name.is_word() && name.ident().is_some() {
 186                                         let ident = name.ident().expect("multi-segment cfg key");
 187                                         let ident_values = cfg
 188                                             .values_valid
 189                                             .entry(ident.name.to_string())
 190                                             .or_insert_with(|| FxHashSet::default());
 191
 192                                         for val in values {
 193                                             if let Some(LitKind::Str(s, _)) =
 194                                                 val.literal().map(|lit| &lit.kind)
 195                                             {
 196                                                 ident_values.insert(s.to_string());
 197                                             } else {
 198                                                 error!(
 199                                                     "`values()` arguments must be string literals"
 200                                                 );
 201                                             }
 202                                         }
 203
 204                                         continue 'specs;
 205                                     } else {
 206                                         error!(
 207                                             "`values()` first argument must be a simple identifer"
 208                                         );
 209                                     }
 210                                 } else if args.is_empty() {
 211                                     cfg.well_known_values = true;
 212                                     continue 'specs;
 213                                 }
 214                             }
 215                         }
 216                     }
 217                     Ok(..) => {}
 218                     Err(err) => err.cancel(),
 219                 },
 220                 Err(errs) => drop(errs),
 221             }
 222
 223             error!(
 224                 "expected `names(name1, name2, ... nameN)` or \
 225                 `values(name, \"value1\", \"value2\", ... \"valueN\")`"
 226             );
 227         }
 228
 229         if let Some(names_valid) = &mut cfg.names_valid {
 230             names_valid.extend(cfg.values_valid.keys().cloned());
 231         }
 232         cfg
 233     })
 234 }
 235
 236 /// The compiler configuration
 237 pub struct Config {
 238     /// Command line options
 239     pub opts: config::Options,
 240
 241     /// cfg! configuration in addition to the default ones
 242     pub crate_cfg: FxHashSet<(String, Option<String>)>,
 243     pub crate_check_cfg: CheckCfg,
 244
 245     pub input: Input,
 246     pub input_path: Option<PathBuf>,
 247     pub output_dir: Option<PathBuf>,
 248     pub output_file: Option<PathBuf>,
 249     pub file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
 250     pub diagnostic_output: DiagnosticOutput,
 251
 252     pub lint_caps: FxHashMap<lint::LintId, lint::Level>,
 253
 254     /// This is a callback from the driver that is called when [`ParseSess`] is created.
 255     pub parse_sess_created: Option<Box<dyn FnOnce(&mut ParseSess) + Send>>,
 256
 257     /// This is a callback from the driver that is called when we're registering lints;
 258     /// it is called during plugin registration when we have the LintStore in a non-shared state.
 259     ///
 260     /// Note that if you find a Some here you probably want to call that function in the new
 261     /// function being registered.
 262     pub register_lints: Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>,
 263
 264     /// This is a callback from the driver that is called just after we have populated
 265     /// the list of queries.
 266     ///
 267     /// The second parameter is local providers and the third parameter is external providers.
 268     pub override_queries:
 269         Option<fn(&Session, &mut ty::query::Providers, &mut ty::query::ExternProviders)>,
 270
 271     /// This is a callback from the driver that is called to create a codegen backend.
 272     pub make_codegen_backend:
 273         Option<Box<dyn FnOnce(&config::Options) -> Box<dyn CodegenBackend> + Send>>,
 274
 275     /// Registry of diagnostics codes.
 276     pub registry: Registry,
 277 }
 278
 279 pub fn create_compiler_and_run<R>(config: Config, f: impl FnOnce(&Compiler) -> R) -> R {
 280     crate::callbacks::setup_callbacks();
 281
 282     let registry = &config.registry;
 283     let (mut sess, codegen_backend) = util::create_session(
 284         config.opts,
 285         config.crate_cfg,
 286         config.crate_check_cfg,
 287         config.diagnostic_output,
 288         config.file_loader,
 289         config.input_path.clone(),
 290         config.lint_caps,
 291         config.make_codegen_backend,
 292         registry.clone(),
 293     );
 294
 295     if let Some(parse_sess_created) = config.parse_sess_created {
 296         parse_sess_created(
 297             &mut Lrc::get_mut(&mut sess)
 298                 .expect("create_session() should never share the returned session")
 299                 .parse_sess,
 300         );
 301     }
 302
 303     let temps_dir = sess.opts.debugging_opts.temps_dir.as_ref().map(|o| PathBuf::from(&o));
 304
 305     let compiler = Compiler {
 306         sess,
 307         codegen_backend,
 308         input: config.input,
 309         input_path: config.input_path,
 310         output_dir: config.output_dir,
 311         output_file: config.output_file,
 312         temps_dir,
 313         register_lints: config.register_lints,
 314         override_queries: config.override_queries,
 315     };
 316
 317     rustc_span::with_source_map(compiler.sess.parse_sess.clone_source_map(), move || {
 318         let r = {
 319             let _sess_abort_error = OnDrop(|| {
 320                 compiler.sess.finish_diagnostics(registry);
 321             });
 322
 323             f(&compiler)
 324         };
 325
 326         let prof = compiler.sess.prof.clone();
 327         prof.generic_activity("drop_compiler").run(move || drop(compiler));
 328         r
 329     })
 330 }
 331
 332 pub fn run_compiler<R: Send>(config: Config, f: impl FnOnce(&Compiler) -> R + Send) -> R {
 333     tracing::trace!("run_compiler");
 334     util::run_in_thread_pool_with_globals(
 335         config.opts.edition,
 336         config.opts.debugging_opts.threads,
 337         || create_compiler_and_run(config, f),
 338     )
 339 }
 340
 341 pub fn try_print_query_stack(handler: &Handler, num_frames: Option<usize>) {
 342     eprintln!("query stack during panic:");
 343
 344     // Be careful relying on global state here: this code is called from
 345     // a panic hook, which means that the global `Handler` may be in a weird
 346     // state if it was responsible for triggering the panic.
 347     let i = ty::tls::with_context_opt(|icx| {
 348         if let Some(icx) = icx {
 349             QueryCtxt::from_tcx(icx.tcx).try_print_query_stack(icx.query, handler, num_frames)
 350         } else {
 351             0
 352         }
 353     });
 354
 355     if num_frames == None || num_frames >= Some(i) {
 356         eprintln!("end of query stack");
 357     } else {
 358         eprintln!("we're just showing a limited slice of the query stack");
 359     }
 360 }