Get rid of of the global_ctxt query

Author: bjorn3

compiler/rustc_driver_impl/src/lib.rs

@@ -45,7 +45,7 @@ use rustc_errors::registry::Registry;
 use rustc_errors::{ColorConfig, DiagCtxt, ErrCode, FatalError, PResult, markdown};
 use rustc_feature::find_gated_cfg;
 use rustc_interface::util::{self, get_codegen_backend};
-use rustc_interface::{Linker, interface, passes};
+use rustc_interface::{Linker, create_and_enter_global_ctxt, interface, passes};
 use rustc_lint::unerased_lint_store;
 use rustc_metadata::creader::MetadataLoader;
 use rustc_metadata::locator;
@@ -400,7 +400,9 @@ fn run_compiler(
             // If pretty printing is requested: Figure out the representation, print it and exit
             if let Some(pp_mode) = sess.opts.pretty {
                 if pp_mode.needs_ast_map() {
-                    queries.global_ctxt().enter(|tcx| {
+                    let krate = queries.parse().steal();
+
+                    create_and_enter_global_ctxt(&compiler, krate, |tcx| {
                         tcx.ensure().early_lint_checks(());
                         pretty::print(sess, pp_mode, pretty::PrintExtra::NeedsAstMap { tcx });
                         passes::write_dep_info(tcx);
@@ -425,7 +427,9 @@ fn run_compiler(
                 return early_exit();
             }
 
-            queries.global_ctxt().enter(|tcx| {
+            let krate = queries.parse().steal();
+
+            create_and_enter_global_ctxt(&compiler, krate, |tcx| {
                 // Make sure name resolution and macro expansion is run.
                 let _ = tcx.resolver_for_lowering();
 

compiler/rustc_interface/src/lib.rs

@@ -8,7 +8,7 @@
 // tidy-alphabetical-end
 
 mod callbacks;
-mod errors;
+pub mod errors;
 pub mod interface;
 pub mod passes;
 mod proc_macro_decls;
@@ -17,7 +17,7 @@ pub mod util;
 
 pub use callbacks::setup_callbacks;
 pub use interface::{Config, run_compiler};
-pub use passes::DEFAULT_QUERY_PROVIDERS;
+pub use passes::{DEFAULT_QUERY_PROVIDERS, create_and_enter_global_ctxt};
 pub use queries::{Linker, Queries};
 
 #[cfg(test)]

compiler/rustc_interface/src/passes.rs

@@ -41,7 +41,7 @@ use tracing::{info, instrument};
 use crate::interface::Compiler;
 use crate::{errors, proc_macro_decls, util};
 
-pub(crate) fn parse<'a>(sess: &'a Session) -> ast::Crate {
+pub fn parse<'a>(sess: &'a Session) -> ast::Crate {
     let krate = sess
         .time("parse_crate", || {
             let mut parser = unwrap_or_emit_fatal(match &sess.io.input {
@@ -709,7 +709,22 @@ pub static DEFAULT_QUERY_PROVIDERS: LazyLock<Providers> = LazyLock::new(|| {
     *providers
 });
 
-pub(crate) fn create_global_ctxt<'tcx>(
+pub fn create_and_enter_global_ctxt<'tcx, T>(
+    compiler: &'tcx Compiler,
+    krate: rustc_ast::Crate,
+    f: impl for<'a> FnOnce(TyCtxt<'a>) -> T,
+) -> T {
+    let gcx_cell = OnceLock::new();
+    let arena = WorkerLocal::new(|_| Arena::default());
+    let hir_arena = WorkerLocal::new(|_| rustc_hir::Arena::default());
+
+    let gcx = create_global_ctxt(compiler, krate, &gcx_cell, &arena, &hir_arena);
+    let ret = gcx.enter(f);
+    gcx.finish();
+    ret
+}
+
+fn create_global_ctxt<'tcx>(
     compiler: &'tcx Compiler,
     mut krate: rustc_ast::Crate,
     gcx_cell: &'tcx OnceLock<GlobalCtxt<'tcx>>,

compiler/rustc_interface/src/queries.rs

@@ -7,9 +7,7 @@ use rustc_codegen_ssa::CodegenResults;
 use rustc_codegen_ssa::traits::CodegenBackend;
 use rustc_data_structures::steal::Steal;
 use rustc_data_structures::svh::Svh;
-use rustc_data_structures::sync::{OnceLock, WorkerLocal};
 use rustc_hir::def_id::LOCAL_CRATE;
-use rustc_middle::arena::Arena;
 use rustc_middle::dep_graph::DepGraph;
 use rustc_middle::ty::{GlobalCtxt, TyCtxt};
 use rustc_session::Session;
@@ -65,51 +63,18 @@ impl<'a, 'tcx> QueryResult<'a, &'tcx GlobalCtxt<'tcx>> {
 
 pub struct Queries<'tcx> {
     compiler: &'tcx Compiler,
-    gcx_cell: OnceLock<GlobalCtxt<'tcx>>,
-
-    arena: WorkerLocal<Arena<'tcx>>,
-    hir_arena: WorkerLocal<rustc_hir::Arena<'tcx>>,
 
     parse: Query<ast::Crate>,
-    // This just points to what's in `gcx_cell`.
-    gcx: Query<&'tcx GlobalCtxt<'tcx>>,
 }
 
 impl<'tcx> Queries<'tcx> {
     pub fn new(compiler: &'tcx Compiler) -> Queries<'tcx> {
-        Queries {
-            compiler,
-            gcx_cell: OnceLock::new(),
-            arena: WorkerLocal::new(|_| Arena::default()),
-            hir_arena: WorkerLocal::new(|_| rustc_hir::Arena::default()),
-            parse: Query { result: RefCell::new(None) },
-            gcx: Query { result: RefCell::new(None) },
-        }
-    }
-
-    pub fn finish(&'tcx self) {
-        if let Some(gcx) = self.gcx_cell.get() {
-            gcx.finish();
-        }
+        Queries { compiler, parse: Query { result: RefCell::new(None) } }
     }
 
     pub fn parse(&self) -> QueryResult<'_, ast::Crate> {
         self.parse.compute(|| passes::parse(&self.compiler.sess))
     }
-
-    pub fn global_ctxt(&'tcx self) -> QueryResult<'tcx, &'tcx GlobalCtxt<'tcx>> {
-        self.gcx.compute(|| {
-            let krate = self.parse().steal();
-
-            passes::create_global_ctxt(
-                self.compiler,
-                krate,
-                &self.gcx_cell,
-                &self.arena,
-                &self.hir_arena,
-            )
-        })
-    }
 }
 
 pub struct Linker {
@@ -192,16 +157,7 @@ impl Compiler {
     where
         F: for<'tcx> FnOnce(&'tcx Queries<'tcx>) -> T,
     {
-        // Must declare `_timer` first so that it is dropped after `queries`.
-        let _timer;
         let queries = Queries::new(self);
-        let ret = f(&queries);
-
-        // The timer's lifetime spans the dropping of `queries`, which contains
-        // the global context.
-        _timer = self.sess.timer("free_global_ctxt");
-        queries.finish();
-
-        ret
+        f(&queries)
     }
 }

src/librustdoc/doctest.rs

@@ -175,23 +175,26 @@ pub(crate) fn run(dcx: DiagCtxtHandle<'_>, input: Input, options: RustdocOptions
         ..
     } = interface::run_compiler(config, |compiler| {
         compiler.enter(|queries| {
-            let collector = queries.global_ctxt().enter(|tcx| {
-                let crate_name = tcx.crate_name(LOCAL_CRATE).to_string();
-                let crate_attrs = tcx.hir().attrs(CRATE_HIR_ID);
-                let opts = scrape_test_config(crate_name, crate_attrs, args_path);
-                let enable_per_target_ignores = options.enable_per_target_ignores;
-
-                let mut collector = CreateRunnableDocTests::new(options, opts);
-                let hir_collector = HirCollector::new(
-                    ErrorCodes::from(compiler.sess.opts.unstable_features.is_nightly_build()),
-                    enable_per_target_ignores,
-                    tcx,
-                );
-                let tests = hir_collector.collect_crate();
-                tests.into_iter().for_each(|t| collector.add_test(t));
-
-                collector
-            });
+            let krate = queries.parse().steal();
+
+            let collector =
+                rustc_interface::create_and_enter_global_ctxt(&compiler, krate, |tcx| {
+                    let crate_name = tcx.crate_name(LOCAL_CRATE).to_string();
+                    let crate_attrs = tcx.hir().attrs(CRATE_HIR_ID);
+                    let opts = scrape_test_config(crate_name, crate_attrs, args_path);
+                    let enable_per_target_ignores = options.enable_per_target_ignores;
+
+                    let mut collector = CreateRunnableDocTests::new(options, opts);
+                    let hir_collector = HirCollector::new(
+                        ErrorCodes::from(compiler.sess.opts.unstable_features.is_nightly_build()),
+                        enable_per_target_ignores,
+                        tcx,
+                    );
+                    let tests = hir_collector.collect_crate();
+                    tests.into_iter().for_each(|t| collector.add_test(t));
+
+                    collector
+                });
             compiler.sess.dcx().abort_if_errors();
 
             collector

src/librustdoc/lib.rs

@@ -857,12 +857,12 @@ fn main_args(
         }
 
         compiler.enter(|queries| {
-            let mut gcx = queries.global_ctxt();
+            let krate = queries.parse().steal();
             if sess.dcx().has_errors().is_some() {
                 sess.dcx().fatal("Compilation failed, aborting rustdoc");
             }
 
-            gcx.enter(|tcx| {
+            rustc_interface::create_and_enter_global_ctxt(&compiler, krate, |tcx| {
                 let (krate, render_opts, mut cache) = sess.time("run_global_ctxt", || {
                     core::run_global_ctxt(tcx, show_coverage, render_options, output_format)
                 });