src/librustc_interface/interface.rs

   1 use crate::queries::Queries;
   2 use crate::util;
   3 use crate::profile;
   4 pub use crate::passes::BoxedResolver;
   5
   6 use rustc::lint;
   7 use rustc::session::config::{self, Input};
   8 use rustc::session::{DiagnosticOutput, Session};
   9 use rustc::util::common::ErrorReported;
  10 use rustc_codegen_utils::codegen_backend::CodegenBackend;
  11 use rustc_data_structures::OnDrop;
  12 use rustc_data_structures::sync::Lrc;
  13 use rustc_data_structures::fx::{FxHashSet, FxHashMap};
  14 use rustc_metadata::cstore::CStore;
  15 use std::path::PathBuf;
  16 use std::result;
  17 use std::sync::{Arc, Mutex};
  18 use syntax;
  19 use syntax::source_map::{FileLoader, SourceMap};
  20 use syntax_pos::edition;
  21
  22 pub type Result<T> = result::Result<T, ErrorReported>;
  23
  24 /// Represents a compiler session.
  25 /// Can be used run `rustc_interface` queries.
  26 /// Created by passing `Config` to `run_compiler`.
  27 pub struct Compiler {
  28     pub(crate) sess: Lrc<Session>,
  29     codegen_backend: Lrc<Box<dyn CodegenBackend>>,
  30     source_map: Lrc<SourceMap>,
  31     pub(crate) input: Input,
  32     pub(crate) input_path: Option<PathBuf>,
  33     pub(crate) output_dir: Option<PathBuf>,
  34     pub(crate) output_file: Option<PathBuf>,
  35     pub(crate) queries: Queries,
  36     pub(crate) cstore: Lrc<CStore>,
  37     pub(crate) crate_name: Option<String>,
  38 }
  39
  40 impl Compiler {
  41     pub fn session(&self) -> &Lrc<Session> {
  42         &self.sess
  43     }
  44     pub fn codegen_backend(&self) -> &Lrc<Box<dyn CodegenBackend>> {
  45         &self.codegen_backend
  46     }
  47     pub fn cstore(&self) -> &Lrc<CStore> {
  48         &self.cstore
  49     }
  50     pub fn source_map(&self) -> &Lrc<SourceMap> {
  51         &self.source_map
  52     }
  53     pub fn input(&self) -> &Input {
  54         &self.input
  55     }
  56     pub fn output_dir(&self) -> &Option<PathBuf> {
  57         &self.output_dir
  58     }
  59     pub fn output_file(&self) -> &Option<PathBuf> {
  60         &self.output_file
  61     }
  62 }
  63
  64 /// The compiler configuration
  65 pub struct Config {
  66     /// Command line options
  67     pub opts: config::Options,
  68
  69     /// cfg! configuration in addition to the default ones
  70     pub crate_cfg: FxHashSet<(String, Option<String>)>,
  71
  72     pub input: Input,
  73     pub input_path: Option<PathBuf>,
  74     pub output_dir: Option<PathBuf>,
  75     pub output_file: Option<PathBuf>,
  76     pub file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
  77     pub diagnostic_output: DiagnosticOutput,
  78
  79     /// Set to capture stderr output during compiler execution
  80     pub stderr: Option<Arc<Mutex<Vec<u8>>>>,
  81
  82     pub crate_name: Option<String>,
  83     pub lint_caps: FxHashMap<lint::LintId, lint::Level>,
  84 }
  85
  86 pub fn run_compiler_in_existing_thread_pool<F, R>(config: Config, f: F) -> R
  87 where
  88     F: FnOnce(&Compiler) -> R,
  89 {
  90     let (sess, codegen_backend, source_map) = util::create_session(
  91         config.opts,
  92         config.crate_cfg,
  93         config.diagnostic_output,
  94         config.file_loader,
  95         config.input_path.clone(),
  96         config.lint_caps,
  97     );
  98
  99     let cstore = Lrc::new(CStore::new(codegen_backend.metadata_loader()));
 100
 101     let compiler = Compiler {
 102         sess,
 103         codegen_backend,
 104         source_map,
 105         cstore,
 106         input: config.input,
 107         input_path: config.input_path,
 108         output_dir: config.output_dir,
 109         output_file: config.output_file,
 110         queries: Default::default(),
 111         crate_name: config.crate_name,
 112     };
 113
 114     let _sess_abort_error = OnDrop(|| {
 115         compiler.sess.diagnostic().print_error_count(&util::diagnostics_registry());
 116     });
 117
 118     if compiler.sess.profile_queries() {
 119         profile::begin(&compiler.sess);
 120     }
 121
 122     let r = f(&compiler);
 123
 124     if compiler.sess.profile_queries() {
 125         profile::dump(&compiler.sess, "profile_queries".to_string())
 126     }
 127
 128     r
 129 }
 130
 131 pub fn run_compiler<F, R>(mut config: Config, f: F) -> R
 132 where
 133     F: FnOnce(&Compiler) -> R + Send,
 134     R: Send,
 135 {
 136     let stderr = config.stderr.take();
 137     util::spawn_thread_pool(
 138         config.opts.edition,
 139         config.opts.debugging_opts.threads,
 140         &stderr,
 141         || run_compiler_in_existing_thread_pool(config, f),
 142     )
 143 }
 144
 145 pub fn default_thread_pool<F, R>(edition: edition::Edition, f: F) -> R
 146 where
 147     F: FnOnce() -> R + Send,
 148     R: Send,
 149 {
 150     util::spawn_thread_pool(edition, None, &None, f)
 151 }