Auto merge of #105220 - oli-obk:feeding, r=cjgillot

feed resolver_for_lowering instead of storing it in a field

r? `@cjgillot`

opening this as

* a discussion for `no_hash` + `feedable` queries. I think we'll want those, but I don't quite understand why they are rejected beyond a double check of the stable hashes for situations where the query is fed but also read from incremental caches.
* and a discussion on removing all untracked fields from TyCtxt and setting it up so that they are fed queries instead

compiler/rustc_interface/src/passes.rs

@@ -12,6 +12,7 @@ use rustc_ast::{self as ast, visit};
 use rustc_borrowck as mir_borrowck;
 use rustc_codegen_ssa::traits::CodegenBackend;
 use rustc_data_structures::parallel;
+use rustc_data_structures::steal::Steal;
 use rustc_data_structures::sync::{Lrc, OnceCell, WorkerLocal};
 use rustc_errors::{ErrorGuaranteed, PResult};
 use rustc_expand::base::{ExtCtxt, LintStoreExpand, ResolverExpand};
@@ -801,6 +802,12 @@ pub fn create_global_ctxt<'tcx>(
         TcxQueries::new(local_providers, extern_providers, query_result_on_disk_cache)
     });
 
+    let ty::ResolverOutputs {
+        definitions,
+        global_ctxt: untracked_resolutions,
+        ast_lowering: untracked_resolver_for_lowering,
+    } = resolver_outputs;
+
     let gcx = sess.time("setup_global_ctxt", || {
         global_ctxt.get_or_init(move || {
             TyCtxt::create_global_ctxt(
@@ -808,7 +815,8 @@ pub fn create_global_ctxt<'tcx>(
                 lint_store,
                 arena,
                 hir_arena,
-                resolver_outputs,
+                definitions,
+                untracked_resolutions,
                 krate,
                 dep_graph,
                 queries.on_disk_cache.as_ref().map(OnDiskCache::as_dyn),
@@ -820,7 +828,12 @@ pub fn create_global_ctxt<'tcx>(
         })
     });
 
-    QueryContext { gcx }
+    let mut qcx = QueryContext { gcx };
+    qcx.enter(|tcx| {
+        tcx.feed_unit_query()
+            .resolver_for_lowering(tcx.arena.alloc(Steal::new(untracked_resolver_for_lowering)))
+    });
+    qcx
 }
 
 /// Runs the resolution, type-checking, region checking and other
@@ -965,12 +978,10 @@ fn analysis(tcx: TyCtxt<'_>, (): ()) -> Result<()> {
 pub fn start_codegen<'tcx>(
     codegen_backend: &dyn CodegenBackend,
     tcx: TyCtxt<'tcx>,
-    outputs: &OutputFilenames,
 ) -> Box<dyn Any> {
     info!("Pre-codegen\n{:?}", tcx.debug_stats());
 
-    let (metadata, need_metadata_module) =
-        rustc_metadata::fs::encode_and_write_metadata(tcx, outputs);
+    let (metadata, need_metadata_module) = rustc_metadata::fs::encode_and_write_metadata(tcx);
 
     let codegen = tcx.sess.time("codegen_crate", move || {
         codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
@@ -986,7 +997,7 @@ pub fn start_codegen<'tcx>(
     info!("Post-codegen\n{:?}", tcx.debug_stats());
 
     if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
-        if let Err(error) = rustc_mir_transform::dump_mir::emit_mir(tcx, outputs) {
+        if let Err(error) = rustc_mir_transform::dump_mir::emit_mir(tcx) {
             tcx.sess.emit_err(CantEmitMIR { error });
             tcx.sess.abort_if_errors();
         }

compiler/rustc_interface/src/queries.rs

@@ -20,6 +20,7 @@ use rustc_span::symbol::sym;
 use std::any::Any;
 use std::cell::{Ref, RefCell, RefMut};
 use std::rc::Rc;
+use std::sync::Arc;
 
 /// Represent the result of a query.
 ///
@@ -214,7 +215,7 @@ impl<'tcx> Queries<'tcx> {
     pub fn global_ctxt(&'tcx self) -> Result<&Query<QueryContext<'tcx>>> {
         self.global_ctxt.compute(|| {
             let crate_name = self.crate_name()?.peek().clone();
-            let outputs = self.prepare_outputs()?.peek().clone();
+            let outputs = self.prepare_outputs()?.take();
             let dep_graph = self.dep_graph()?.peek().clone();
             let (krate, resolver, lint_store) = self.expansion()?.take();
             Ok(passes::create_global_ctxt(
@@ -235,7 +236,6 @@ impl<'tcx> Queries<'tcx> {
 
     pub fn ongoing_codegen(&'tcx self) -> Result<&Query<Box<dyn Any>>> {
         self.ongoing_codegen.compute(|| {
-            let outputs = self.prepare_outputs()?;
             self.global_ctxt()?.peek_mut().enter(|tcx| {
                 tcx.analysis(()).ok();
 
@@ -249,7 +249,7 @@ impl<'tcx> Queries<'tcx> {
                 // Hook for UI tests.
                 Self::check_for_rustc_errors_attr(tcx);
 
-                Ok(passes::start_codegen(&***self.codegen_backend(), tcx, &*outputs.peek()))
+                Ok(passes::start_codegen(&***self.codegen_backend(), tcx))
             })
         })
     }
@@ -293,8 +293,10 @@ impl<'tcx> Queries<'tcx> {
         let codegen_backend = self.codegen_backend().clone();
 
         let dep_graph = self.dep_graph()?.peek().clone();
-        let prepare_outputs = self.prepare_outputs()?.take();
-        let crate_hash = self.global_ctxt()?.peek_mut().enter(|tcx| tcx.crate_hash(LOCAL_CRATE));
+        let (crate_hash, prepare_outputs) = self
+            .global_ctxt()?
+            .peek_mut()
+            .enter(|tcx| (tcx.crate_hash(LOCAL_CRATE), tcx.output_filenames(()).clone()));
         let ongoing_codegen = self.ongoing_codegen()?.take();
 
         Ok(Linker {
@@ -316,7 +318,7 @@ pub struct Linker {
 
     // compilation outputs
     dep_graph: DepGraph,
-    prepare_outputs: OutputFilenames,
+    prepare_outputs: Arc<OutputFilenames>,
     crate_hash: Svh,
     ongoing_codegen: Box<dyn Any>,
 }