src/librustc_interface/interface.rs

   1 pub use crate::passes::BoxedResolver;
   2 use crate::util;
   3
   4 use rustc_ast::ast::{self, MetaItemKind};
   5 use rustc_ast::token;
   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::ErrorReported;
  12 use rustc_lint::LintStore;
  13 use rustc_middle::ty;
  14 use rustc_parse::new_parser_from_source_str;
  15 use rustc_session::config::{self, ErrorOutputType, Input, OutputFilenames};
  16 use rustc_session::early_error;
  17 use rustc_session::lint;
  18 use rustc_session::parse::{CrateConfig, ParseSess};
  19 use rustc_session::{DiagnosticOutput, Session};
  20 use rustc_span::edition;
  21 use rustc_span::source_map::{FileLoader, FileName};
  22 use std::path::PathBuf;
  23 use std::result;
  24 use std::sync::{Arc, Mutex};
  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     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 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 input(&self) -> &Input {
  52         &self.input
  53     }
  54     pub fn output_dir(&self) -> &Option<PathBuf> {
  55         &self.output_dir
  56     }
  57     pub fn output_file(&self) -> &Option<PathBuf> {
  58         &self.output_file
  59     }
  60     pub fn build_output_filenames(
  61         &self,
  62         sess: &Session,
  63         attrs: &[ast::Attribute],
  64     ) -> OutputFilenames {
  65         util::build_output_filenames(
  66             &self.input,
  67             &self.output_dir,
  68             &self.output_file,
  69             &attrs,
  70             &sess,
  71         )
  72     }
  73 }
  74
  75 /// Converts strings provided as `--cfg [cfgspec]` into a `crate_cfg`.
  76 pub fn parse_cfgspecs(cfgspecs: Vec<String>) -> FxHashSet<(String, Option<String>)> {
  77     rustc_ast::with_default_globals(move || {
  78         let cfg = cfgspecs
  79             .into_iter()
  80             .map(|s| {
  81                 let sess = ParseSess::with_silent_emitter();
  82                 let filename = FileName::cfg_spec_source_code(&s);
  83                 let mut parser = new_parser_from_source_str(&sess, filename, s.to_string());
  84
  85                 macro_rules! error {
  86                     ($reason: expr) => {
  87                         early_error(
  88                             ErrorOutputType::default(),
  89                             &format!(concat!("invalid `--cfg` argument: `{}` (", $reason, ")"), s),
  90                         );
  91                     };
  92                 }
  93
  94                 match &mut parser.parse_meta_item() {
  95                     Ok(meta_item) if parser.token == token::Eof => {
  96                         if meta_item.path.segments.len() != 1 {
  97                             error!("argument key must be an identifier");
  98                         }
  99                         match &meta_item.kind {
 100                             MetaItemKind::List(..) => {
 101                                 error!(r#"expected `key` or `key="value"`"#);
 102                             }
 103                             MetaItemKind::NameValue(lit) if !lit.kind.is_str() => {
 104                                 error!("argument value must be a string");
 105                             }
 106                             MetaItemKind::NameValue(..) | MetaItemKind::Word => {
 107                                 let ident = meta_item.ident().expect("multi-segment cfg key");
 108                                 return (ident.name, meta_item.value_str());
 109                             }
 110                         }
 111                     }
 112                     Ok(..) => {}
 113                     Err(err) => err.cancel(),
 114                 }
 115
 116                 error!(r#"expected `key` or `key="value"`"#);
 117             })
 118             .collect::<CrateConfig>();
 119         cfg.into_iter().map(|(a, b)| (a.to_string(), b.map(|b| b.to_string()))).collect()
 120     })
 121 }
 122
 123 /// The compiler configuration
 124 pub struct Config {
 125     /// Command line options
 126     pub opts: config::Options,
 127
 128     /// cfg! configuration in addition to the default ones
 129     pub crate_cfg: FxHashSet<(String, Option<String>)>,
 130
 131     pub input: Input,
 132     pub input_path: Option<PathBuf>,
 133     pub output_dir: Option<PathBuf>,
 134     pub output_file: Option<PathBuf>,
 135     pub file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
 136     pub diagnostic_output: DiagnosticOutput,
 137
 138     /// Set to capture stderr output during compiler execution
 139     pub stderr: Option<Arc<Mutex<Vec<u8>>>>,
 140
 141     pub crate_name: Option<String>,
 142     pub lint_caps: FxHashMap<lint::LintId, lint::Level>,
 143
 144     /// This is a callback from the driver that is called when we're registering lints;
 145     /// it is called during plugin registration when we have the LintStore in a non-shared state.
 146     ///
 147     /// Note that if you find a Some here you probably want to call that function in the new
 148     /// function being registered.
 149     pub register_lints: Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>,
 150
 151     /// This is a callback from the driver that is called just after we have populated
 152     /// the list of queries.
 153     ///
 154     /// The second parameter is local providers and the third parameter is external providers.
 155     pub override_queries:
 156         Option<fn(&Session, &mut ty::query::Providers<'_>, &mut ty::query::Providers<'_>)>,
 157
 158     /// Registry of diagnostics codes.
 159     pub registry: Registry,
 160 }
 161
 162 pub fn run_compiler_in_existing_thread_pool<R>(
 163     config: Config,
 164     f: impl FnOnce(&Compiler) -> R,
 165 ) -> R {
 166     let registry = &config.registry;
 167     let (sess, codegen_backend) = util::create_session(
 168         config.opts,
 169         config.crate_cfg,
 170         config.diagnostic_output,
 171         config.file_loader,
 172         config.input_path.clone(),
 173         config.lint_caps,
 174         registry.clone(),
 175     );
 176
 177     let compiler = Compiler {
 178         sess,
 179         codegen_backend,
 180         input: config.input,
 181         input_path: config.input_path,
 182         output_dir: config.output_dir,
 183         output_file: config.output_file,
 184         crate_name: config.crate_name,
 185         register_lints: config.register_lints,
 186         override_queries: config.override_queries,
 187     };
 188
 189     let r = {
 190         let _sess_abort_error = OnDrop(|| {
 191             compiler.sess.finish_diagnostics(registry);
 192         });
 193
 194         f(&compiler)
 195     };
 196
 197     let prof = compiler.sess.prof.clone();
 198     prof.generic_activity("drop_compiler").run(move || drop(compiler));
 199     r
 200 }
 201
 202 pub fn run_compiler<R: Send>(mut config: Config, f: impl FnOnce(&Compiler) -> R + Send) -> R {
 203     let stderr = config.stderr.take();
 204     util::spawn_thread_pool(
 205         config.opts.edition,
 206         config.opts.debugging_opts.threads,
 207         &stderr,
 208         || run_compiler_in_existing_thread_pool(config, f),
 209     )
 210 }
 211
 212 pub fn default_thread_pool<R: Send>(edition: edition::Edition, f: impl FnOnce() -> R + Send) -> R {
 213     // the 1 here is duplicating code in config.opts.debugging_opts.threads
 214     // which also defaults to 1; it ultimately doesn't matter as the default
 215     // isn't threaded, and just ignores this parameter
 216     util::spawn_thread_pool(edition, 1, &None, f)
 217 }