Auto merge of #85810 - bjorn3:further_driver_cleanup, r=varkor

Driver improvements

This PR contains a couple of cleanups for the driver and a few small improvements for the custom codegen backend interface. It also implements `--version` and `-Cpasses=list` support for custom codegen backends.

1 files changed, 15 insertions, 12 deletions

diff --git a/compiler/rustc_interface/src/queries.rs b/compiler/rustc_interface/src/queries.rs
index 969b526235b..2320f0b47d2 100644
--- a/compiler/rustc_interface/src/queries.rs
+++ b/compiler/rustc_interface/src/queries.rs
@@ -245,8 +245,7 @@ impl<'tcx> Queries<'tcx> {
         self.prepare_outputs.compute(|| {
             let expansion_result = self.expansion()?;
             let (krate, boxed_resolver, _) = &*expansion_result.peek();
-            let crate_name = self.crate_name()?;
-            let crate_name = crate_name.peek();
+            let crate_name = self.crate_name()?.peek();
             passes::prepare_outputs(
                 self.session(),
                 self.compiler,
@@ -343,32 +342,36 @@ impl<'tcx> Queries<'tcx> {
     }
 
     pub fn linker(&'tcx self) -> Result<Linker> {
-        let dep_graph = self.dep_graph()?;
-        let prepare_outputs = self.prepare_outputs()?;
-        let crate_hash = self.global_ctxt()?.peek_mut().enter(|tcx| tcx.crate_hash(LOCAL_CRATE));
-        let ongoing_codegen = self.ongoing_codegen()?;
-
         let sess = self.session().clone();
         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 ongoing_codegen = self.ongoing_codegen()?.take();
+
         Ok(Linker {
             sess,
-            dep_graph: dep_graph.peek().clone(),
-            prepare_outputs: prepare_outputs.take(),
-            crate_hash,
-            ongoing_codegen: ongoing_codegen.take(),
             codegen_backend,
+
+            dep_graph,
+            prepare_outputs,
+            crate_hash,
+            ongoing_codegen,
         })
     }
 }
 
 pub struct Linker {
+    // compilation inputs
     sess: Lrc<Session>,
+    codegen_backend: Lrc<Box<dyn CodegenBackend>>,
+
+    // compilation outputs
     dep_graph: DepGraph,
     prepare_outputs: OutputFilenames,
     crate_hash: Svh,
     ongoing_codegen: Box<dyn Any>,
-    codegen_backend: Lrc<Box<dyn CodegenBackend>>,
 }
 
 impl Linker {