src/librustc_interface/interface.rs

   1 use crate::util;
   2 pub use crate::passes::BoxedResolver;
   3
   4 use rustc::lint;
   5 use rustc::session::early_error;
   6 use rustc::session::config::{self, Input, ErrorOutputType};
   7 use rustc::session::{DiagnosticOutput, Session};
   8 use rustc::util::common::ErrorReported;
   9 use rustc_codegen_utils::codegen_backend::CodegenBackend;
  10 use rustc_data_structures::OnDrop;
  11 use rustc_data_structures::sync::Lrc;
  12 use rustc_data_structures::fx::{FxHashSet, FxHashMap};
  13 use rustc_errors::registry::Registry;
  14 use rustc_parse::new_parser_from_source_str;
  15 use rustc::ty;
  16 use std::path::PathBuf;
  17 use std::result;
  18 use std::sync::{Arc, Mutex};
  19 use syntax::ast::{self, MetaItemKind};
  20 use syntax::token;
  21 use syntax::source_map::{FileName, FileLoader, SourceMap};
  22 use syntax::sess::ParseSess;
  23 use syntax_pos::edition;
  24
  25 pub type Result<T> = result::Result<T, ErrorReported>;
  26
  27 /// Represents a compiler session.
  28 /// Can be used run `rustc_interface` queries.
  29 /// Created by passing `Config` to `run_compiler`.
  30 pub struct Compiler {
  31     pub(crate) sess: Lrc<Session>,
  32     codegen_backend: Lrc<Box<dyn CodegenBackend>>,
  33     source_map: Lrc<SourceMap>,
  34     pub(crate) input: Input,
  35     pub(crate) input_path: Option<PathBuf>,
  36     pub(crate) output_dir: Option<PathBuf>,
  37     pub(crate) output_file: Option<PathBuf>,
  38     pub(crate) crate_name: Option<String>,
  39     pub(crate) register_lints: Option<Box<dyn Fn(&Session, &mut lint::LintStore) + Send + Sync>>,
  40     pub(crate) override_queries:
  41         Option<fn(&Session, &mut ty::query::Providers<'_>, &mut ty::query::Providers<'_>)>,
  42 }
  43
  44 impl Compiler {
  45     pub fn session(&self) -> &Lrc<Session> {
  46         &self.sess
  47     }
  48     pub fn codegen_backend(&self) -> &Lrc<Box<dyn CodegenBackend>> {
  49         &self.codegen_backend
  50     }
  51     pub fn source_map(&self) -> &Lrc<SourceMap> {
  52         &self.source_map
  53     }
  54     pub fn input(&self) -> &Input {
  55         &self.input
  56     }
  57     pub fn output_dir(&self) -> &Option<PathBuf> {
  58         &self.output_dir
  59     }
  60     pub fn output_file(&self) -> &Option<PathBuf> {
  61         &self.output_file
  62     }
  63 }
  64
  65 /// Converts strings provided as `--cfg [cfgspec]` into a `crate_cfg`.
  66 pub fn parse_cfgspecs(cfgspecs: Vec<String>) -> FxHashSet<(String, Option<String>)> {
  67     syntax::with_default_globals(move || {
  68         let cfg = cfgspecs.into_iter().map(|s| {
  69             let sess = ParseSess::with_silent_emitter();
  70             let filename = FileName::cfg_spec_source_code(&s);
  71             let mut parser = new_parser_from_source_str(&sess, filename, s.to_string());
  72
  73             macro_rules! error {($reason: expr) => {
  74                 early_error(ErrorOutputType::default(),
  75                             &format!(concat!("invalid `--cfg` argument: `{}` (", $reason, ")"), s));
  76             }}
  77
  78             match &mut parser.parse_meta_item() {
  79                 Ok(meta_item) if parser.token == token::Eof => {
  80                     if meta_item.path.segments.len() != 1 {
  81                         error!("argument key must be an identifier");
  82                     }
  83                     match &meta_item.kind {
  84                         MetaItemKind::List(..) => {
  85                             error!(r#"expected `key` or `key="value"`"#);
  86                         }
  87                         MetaItemKind::NameValue(lit) if !lit.kind.is_str() => {
  88                             error!("argument value must be a string");
  89                         }
  90                         MetaItemKind::NameValue(..) | MetaItemKind::Word => {
  91                             let ident = meta_item.ident().expect("multi-segment cfg key");
  92                             return (ident.name, meta_item.value_str());
  93                         }
  94                     }
  95                 }
  96                 Ok(..) => {}
  97                 Err(err) => err.cancel(),
  98             }
  99
 100             error!(r#"expected `key` or `key="value"`"#);
 101         }).collect::<ast::CrateConfig>();
 102         cfg.into_iter().map(|(a, b)| {
 103             (a.to_string(), b.map(|b| b.to_string()))
 104         }).collect()
 105     })
 106 }
 107
 108 /// The compiler configuration
 109 pub struct Config {
 110     /// Command line options
 111     pub opts: config::Options,
 112
 113     /// cfg! configuration in addition to the default ones
 114     pub crate_cfg: FxHashSet<(String, Option<String>)>,
 115
 116     pub input: Input,
 117     pub input_path: Option<PathBuf>,
 118     pub output_dir: Option<PathBuf>,
 119     pub output_file: Option<PathBuf>,
 120     pub file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
 121     pub diagnostic_output: DiagnosticOutput,
 122
 123     /// Set to capture stderr output during compiler execution
 124     pub stderr: Option<Arc<Mutex<Vec<u8>>>>,
 125
 126     pub crate_name: Option<String>,
 127     pub lint_caps: FxHashMap<lint::LintId, lint::Level>,
 128
 129     /// This is a callback from the driver that is called when we're registering lints;
 130     /// it is called during plugin registration when we have the LintStore in a non-shared state.
 131     ///
 132     /// Note that if you find a Some here you probably want to call that function in the new
 133     /// function being registered.
 134     pub register_lints: Option<Box<dyn Fn(&Session, &mut lint::LintStore) + Send + Sync>>,
 135
 136     /// This is a callback from the driver that is called just after we have populated
 137     /// the list of queries.
 138     ///
 139     /// The second parameter is local providers and the third parameter is external providers.
 140     pub override_queries:
 141         Option<fn(&Session, &mut ty::query::Providers<'_>, &mut ty::query::Providers<'_>)>,
 142
 143     /// Registry of diagnostics codes.
 144     pub registry: Registry,
 145 }
 146
 147 pub fn run_compiler_in_existing_thread_pool<R>(
 148     config: Config,
 149     f: impl FnOnce(&Compiler) -> R,
 150 ) -> R {
 151     let registry = &config.registry;
 152     let (sess, codegen_backend, source_map) = util::create_session(
 153         config.opts,
 154         config.crate_cfg,
 155         config.diagnostic_output,
 156         config.file_loader,
 157         config.input_path.clone(),
 158         config.lint_caps,
 159         registry.clone(),
 160     );
 161
 162     let compiler = Compiler {
 163         sess,
 164         codegen_backend,
 165         source_map,
 166         input: config.input,
 167         input_path: config.input_path,
 168         output_dir: config.output_dir,
 169         output_file: config.output_file,
 170         crate_name: config.crate_name,
 171         register_lints: config.register_lints,
 172         override_queries: config.override_queries,
 173     };
 174
 175     let _sess_abort_error = OnDrop(|| {
 176         compiler.sess.diagnostic().print_error_count(registry);
 177     });
 178
 179     f(&compiler)
 180 }
 181
 182 pub fn run_compiler<R: Send>(mut config: Config, f: impl FnOnce(&Compiler) -> R + Send) -> R {
 183     let stderr = config.stderr.take();
 184     util::spawn_thread_pool(
 185         config.opts.edition,
 186         config.opts.debugging_opts.threads,
 187         &stderr,
 188         || run_compiler_in_existing_thread_pool(config, f),
 189     )
 190 }
 191
 192 pub fn default_thread_pool<R: Send>(edition: edition::Edition, f: impl FnOnce() -> R + Send) -> R {
 193     // the 1 here is duplicating code in config.opts.debugging_opts.threads
 194     // which also defaults to 1; it ultimately doesn't matter as the default
 195     // isn't threaded, and just ignores this parameter
 196     util::spawn_thread_pool(edition, 1, &None, f)
 197 }