src/librustc_interface/interface.rs

   1 pub use crate::passes::BoxedResolver;
   2 use crate::util;
   3
   4 use rustc::lint;
   5 use rustc::session::config::{self, ErrorOutputType, Input};
   6 use rustc::session::early_error;
   7 use rustc::session::{DiagnosticOutput, Session};
   8 use rustc::ty;
   9 use rustc::util::common::ErrorReported;
  10 use rustc_codegen_utils::codegen_backend::CodegenBackend;
  11 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
  12 use rustc_data_structures::sync::Lrc;
  13 use rustc_data_structures::OnDrop;
  14 use rustc_errors::registry::Registry;
  15 use rustc_lint::LintStore;
  16 use rustc_parse::new_parser_from_source_str;
  17 use rustc_span::edition;
  18 use rustc_span::source_map::{FileLoader, FileName, SourceMap};
  19 use std::path::PathBuf;
  20 use std::result;
  21 use std::sync::{Arc, Mutex};
  22 use syntax::ast::{self, MetaItemKind};
  23 use syntax::sess::ParseSess;
  24 use syntax::token;
  25
  26 pub type Result<T> = result::Result<T, ErrorReported>;
  27
  28 /// Represents a compiler session.
  29 /// Can be used to run `rustc_interface` queries.
  30 /// Created by passing `Config` to `run_compiler`.
  31 pub struct Compiler {
  32     pub(crate) sess: Lrc<Session>,
  33     codegen_backend: Lrc<Box<dyn CodegenBackend>>,
  34     source_map: Lrc<SourceMap>,
  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) crate_name: Option<String>,
  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::Providers<'_>)>,
  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 source_map(&self) -> &Lrc<SourceMap> {
  53         &self.source_map
  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 }
  65
  66 /// Converts strings provided as `--cfg [cfgspec]` into a `crate_cfg`.
  67 pub fn parse_cfgspecs(cfgspecs: Vec<String>) -> FxHashSet<(String, Option<String>)> {
  68     syntax::with_default_globals(move || {
  69         let cfg = cfgspecs
  70             .into_iter()
  71             .map(|s| {
  72                 let sess = ParseSess::with_silent_emitter();
  73                 let filename = FileName::cfg_spec_source_code(&s);
  74                 let mut parser = new_parser_from_source_str(&sess, filename, s.to_string());
  75
  76                 macro_rules! error {
  77                     ($reason: expr) => {
  78                         early_error(
  79                             ErrorOutputType::default(),
  80                             &format!(concat!("invalid `--cfg` argument: `{}` (", $reason, ")"), s),
  81                         );
  82                     };
  83                 }
  84
  85                 match &mut parser.parse_meta_item() {
  86                     Ok(meta_item) if parser.token == token::Eof => {
  87                         if meta_item.path.segments.len() != 1 {
  88                             error!("argument key must be an identifier");
  89                         }
  90                         match &meta_item.kind {
  91                             MetaItemKind::List(..) => {
  92                                 error!(r#"expected `key` or `key="value"`"#);
  93                             }
  94                             MetaItemKind::NameValue(lit) if !lit.kind.is_str() => {
  95                                 error!("argument value must be a string");
  96                             }
  97                             MetaItemKind::NameValue(..) | MetaItemKind::Word => {
  98                                 let ident = meta_item.ident().expect("multi-segment cfg key");
  99                                 return (ident.name, meta_item.value_str());
 100                             }
 101                         }
 102                     }
 103                     Ok(..) => {}
 104                     Err(err) => err.cancel(),
 105                 }
 106
 107                 error!(r#"expected `key` or `key="value"`"#);
 108             })
 109             .collect::<ast::CrateConfig>();
 110         cfg.into_iter().map(|(a, b)| (a.to_string(), b.map(|b| b.to_string()))).collect()
 111     })
 112 }
 113
 114 /// The compiler configuration
 115 pub struct Config {
 116     /// Command line options
 117     pub opts: config::Options,
 118
 119     /// cfg! configuration in addition to the default ones
 120     pub crate_cfg: FxHashSet<(String, Option<String>)>,
 121
 122     pub input: Input,
 123     pub input_path: Option<PathBuf>,
 124     pub output_dir: Option<PathBuf>,
 125     pub output_file: Option<PathBuf>,
 126     pub file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
 127     pub diagnostic_output: DiagnosticOutput,
 128
 129     /// Set to capture stderr output during compiler execution
 130     pub stderr: Option<Arc<Mutex<Vec<u8>>>>,
 131
 132     pub crate_name: Option<String>,
 133     pub lint_caps: FxHashMap<lint::LintId, lint::Level>,
 134
 135     /// This is a callback from the driver that is called when we're registering lints;
 136     /// it is called during plugin registration when we have the LintStore in a non-shared state.
 137     ///
 138     /// Note that if you find a Some here you probably want to call that function in the new
 139     /// function being registered.
 140     pub register_lints: Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>,
 141
 142     /// This is a callback from the driver that is called just after we have populated
 143     /// the list of queries.
 144     ///
 145     /// The second parameter is local providers and the third parameter is external providers.
 146     pub override_queries:
 147         Option<fn(&Session, &mut ty::query::Providers<'_>, &mut ty::query::Providers<'_>)>,
 148
 149     /// Registry of diagnostics codes.
 150     pub registry: Registry,
 151 }
 152
 153 pub fn run_compiler_in_existing_thread_pool<R>(
 154     config: Config,
 155     f: impl FnOnce(&Compiler) -> R,
 156 ) -> R {
 157     let registry = &config.registry;
 158     let (sess, codegen_backend, source_map) = util::create_session(
 159         config.opts,
 160         config.crate_cfg,
 161         config.diagnostic_output,
 162         config.file_loader,
 163         config.input_path.clone(),
 164         config.lint_caps,
 165         registry.clone(),
 166     );
 167
 168     let compiler = Compiler {
 169         sess,
 170         codegen_backend,
 171         source_map,
 172         input: config.input,
 173         input_path: config.input_path,
 174         output_dir: config.output_dir,
 175         output_file: config.output_file,
 176         crate_name: config.crate_name,
 177         register_lints: config.register_lints,
 178         override_queries: config.override_queries,
 179     };
 180
 181     let r = {
 182         let _sess_abort_error = OnDrop(|| {
 183             compiler.sess.diagnostic().print_error_count(registry);
 184         });
 185
 186         f(&compiler)
 187     };
 188
 189     let prof = compiler.sess.prof.clone();
 190     prof.generic_activity("drop_compiler").run(move || drop(compiler));
 191     r
 192 }
 193
 194 pub fn run_compiler<R: Send>(mut config: Config, f: impl FnOnce(&Compiler) -> R + Send) -> R {
 195     let stderr = config.stderr.take();
 196     util::spawn_thread_pool(
 197         config.opts.edition,
 198         config.opts.debugging_opts.threads,
 199         &stderr,
 200         || run_compiler_in_existing_thread_pool(config, f),
 201     )
 202 }
 203
 204 pub fn default_thread_pool<R: Send>(edition: edition::Edition, f: impl FnOnce() -> R + Send) -> R {
 205     // the 1 here is duplicating code in config.opts.debugging_opts.threads
 206     // which also defaults to 1; it ultimately doesn't matter as the default
 207     // isn't threaded, and just ignores this parameter
 208     util::spawn_thread_pool(edition, 1, &None, f)
 209 }