mv compiler to compiler/

compiler/rustc_interface/src/interface.rs

@@ -0,0 +1,209 @@
+pub use crate::passes::BoxedResolver;
+use crate::util;
+
+use rustc_ast::token;
+use rustc_ast::{self as ast, MetaItemKind};
+use rustc_codegen_ssa::traits::CodegenBackend;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_data_structures::sync::Lrc;
+use rustc_data_structures::OnDrop;
+use rustc_errors::registry::Registry;
+use rustc_errors::ErrorReported;
+use rustc_lint::LintStore;
+use rustc_middle::ty;
+use rustc_parse::new_parser_from_source_str;
+use rustc_session::config::{self, ErrorOutputType, Input, OutputFilenames};
+use rustc_session::early_error;
+use rustc_session::lint;
+use rustc_session::parse::{CrateConfig, ParseSess};
+use rustc_session::{DiagnosticOutput, Session};
+use rustc_span::source_map::{FileLoader, FileName};
+use std::path::PathBuf;
+use std::result;
+use std::sync::{Arc, Mutex};
+
+pub type Result<T> = result::Result<T, ErrorReported>;
+
+/// Represents a compiler session.
+/// Can be used to run `rustc_interface` queries.
+/// Created by passing `Config` to `run_compiler`.
+pub struct Compiler {
+    pub(crate) sess: Lrc<Session>,
+    codegen_backend: Lrc<Box<dyn CodegenBackend>>,
+    pub(crate) input: Input,
+    pub(crate) input_path: Option<PathBuf>,
+    pub(crate) output_dir: Option<PathBuf>,
+    pub(crate) output_file: Option<PathBuf>,
+    pub(crate) crate_name: Option<String>,
+    pub(crate) register_lints: Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>,
+    pub(crate) override_queries:
+        Option<fn(&Session, &mut ty::query::Providers, &mut ty::query::Providers)>,
+}
+
+impl Compiler {
+    pub fn session(&self) -> &Lrc<Session> {
+        &self.sess
+    }
+    pub fn codegen_backend(&self) -> &Lrc<Box<dyn CodegenBackend>> {
+        &self.codegen_backend
+    }
+    pub fn input(&self) -> &Input {
+        &self.input
+    }
+    pub fn output_dir(&self) -> &Option<PathBuf> {
+        &self.output_dir
+    }
+    pub fn output_file(&self) -> &Option<PathBuf> {
+        &self.output_file
+    }
+    pub fn build_output_filenames(
+        &self,
+        sess: &Session,
+        attrs: &[ast::Attribute],
+    ) -> OutputFilenames {
+        util::build_output_filenames(
+            &self.input,
+            &self.output_dir,
+            &self.output_file,
+            &attrs,
+            &sess,
+        )
+    }
+}
+
+/// Converts strings provided as `--cfg [cfgspec]` into a `crate_cfg`.
+pub fn parse_cfgspecs(cfgspecs: Vec<String>) -> FxHashSet<(String, Option<String>)> {
+    rustc_span::with_default_session_globals(move || {
+        let cfg = cfgspecs
+            .into_iter()
+            .map(|s| {
+                let sess = ParseSess::with_silent_emitter();
+                let filename = FileName::cfg_spec_source_code(&s);
+                let mut parser = new_parser_from_source_str(&sess, filename, s.to_string());
+
+                macro_rules! error {
+                    ($reason: expr) => {
+                        early_error(
+                            ErrorOutputType::default(),
+                            &format!(concat!("invalid `--cfg` argument: `{}` (", $reason, ")"), s),
+                        );
+                    };
+                }
+
+                match &mut parser.parse_meta_item() {
+                    Ok(meta_item) if parser.token == token::Eof => {
+                        if meta_item.path.segments.len() != 1 {
+                            error!("argument key must be an identifier");
+                        }
+                        match &meta_item.kind {
+                            MetaItemKind::List(..) => {
+                                error!(r#"expected `key` or `key="value"`"#);
+                            }
+                            MetaItemKind::NameValue(lit) if !lit.kind.is_str() => {
+                                error!("argument value must be a string");
+                            }
+                            MetaItemKind::NameValue(..) | MetaItemKind::Word => {
+                                let ident = meta_item.ident().expect("multi-segment cfg key");
+                                return (ident.name, meta_item.value_str());
+                            }
+                        }
+                    }
+                    Ok(..) => {}
+                    Err(err) => err.cancel(),
+                }
+
+                error!(r#"expected `key` or `key="value"`"#);
+            })
+            .collect::<CrateConfig>();
+        cfg.into_iter().map(|(a, b)| (a.to_string(), b.map(|b| b.to_string()))).collect()
+    })
+}
+
+/// The compiler configuration
+pub struct Config {
+    /// Command line options
+    pub opts: config::Options,
+
+    /// cfg! configuration in addition to the default ones
+    pub crate_cfg: FxHashSet<(String, Option<String>)>,
+
+    pub input: Input,
+    pub input_path: Option<PathBuf>,
+    pub output_dir: Option<PathBuf>,
+    pub output_file: Option<PathBuf>,
+    pub file_loader: Option<Box<dyn FileLoader + Send + Sync>>,
+    pub diagnostic_output: DiagnosticOutput,
+
+    /// Set to capture stderr output during compiler execution
+    pub stderr: Option<Arc<Mutex<Vec<u8>>>>,
+
+    pub crate_name: Option<String>,
+    pub lint_caps: FxHashMap<lint::LintId, lint::Level>,
+
+    /// This is a callback from the driver that is called when we're registering lints;
+    /// it is called during plugin registration when we have the LintStore in a non-shared state.
+    ///
+    /// Note that if you find a Some here you probably want to call that function in the new
+    /// function being registered.
+    pub register_lints: Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>,
+
+    /// This is a callback from the driver that is called just after we have populated
+    /// the list of queries.
+    ///
+    /// The second parameter is local providers and the third parameter is external providers.
+    pub override_queries:
+        Option<fn(&Session, &mut ty::query::Providers, &mut ty::query::Providers)>,
+
+    /// Registry of diagnostics codes.
+    pub registry: Registry,
+}
+
+pub fn create_compiler_and_run<R>(config: Config, f: impl FnOnce(&Compiler) -> R) -> R {
+    let registry = &config.registry;
+    let (sess, codegen_backend) = util::create_session(
+        config.opts,
+        config.crate_cfg,
+        config.diagnostic_output,
+        config.file_loader,
+        config.input_path.clone(),
+        config.lint_caps,
+        registry.clone(),
+    );
+
+    let compiler = Compiler {
+        sess,
+        codegen_backend,
+        input: config.input,
+        input_path: config.input_path,
+        output_dir: config.output_dir,
+        output_file: config.output_file,
+        crate_name: config.crate_name,
+        register_lints: config.register_lints,
+        override_queries: config.override_queries,
+    };
+
+    rustc_span::with_source_map(compiler.sess.parse_sess.clone_source_map(), move || {
+        let r = {
+            let _sess_abort_error = OnDrop(|| {
+                compiler.sess.finish_diagnostics(registry);
+            });
+
+            f(&compiler)
+        };
+
+        let prof = compiler.sess.prof.clone();
+        prof.generic_activity("drop_compiler").run(move || drop(compiler));
+        r
+    })
+}
+
+pub fn run_compiler<R: Send>(mut config: Config, f: impl FnOnce(&Compiler) -> R + Send) -> R {
+    tracing::trace!("run_compiler");
+    let stderr = config.stderr.take();
+    util::setup_callbacks_and_run_in_thread_pool_with_globals(
+        config.opts.edition,
+        config.opts.debugging_opts.threads,
+        &stderr,
+        || create_compiler_and_run(config, f),
+    )
+}