Make thir_tree and thir_flat into hooks

compiler/rustc_middle/src/hooks/mod.rs

@@ -102,4 +102,10 @@ fn clone(&self) -> Self { *self }
     /// turn a deserialized `DefPathHash` into its current `DefId`.
     /// Will fetch a DefId from a DefPathHash for a foreign crate.
     hook def_path_hash_to_def_id_extern(hash: DefPathHash, stable_crate_id: StableCrateId) -> DefId;
+
+    /// Create a THIR tree for debugging.
+    hook thir_tree(key: LocalDefId) -> String;
+
+    /// Create a list-like THIR representation for debugging.
+    hook thir_flat(key: LocalDefId) -> String;
 }

compiler/rustc_middle/src/query/mod.rs

@@ -474,20 +474,6 @@
         desc { |tcx| "building THIR for `{}`", tcx.def_path_str(key) }
     }
 
-    /// Create a THIR tree for debugging.
-    query thir_tree(key: LocalDefId) -> &'tcx String {
-        no_hash
-        arena_cache
-        desc { |tcx| "constructing THIR tree for `{}`", tcx.def_path_str(key) }
-    }
-
-    /// Create a list-like THIR representation for debugging.
-    query thir_flat(key: LocalDefId) -> &'tcx String {
-        no_hash
-        arena_cache
-        desc { |tcx| "constructing flat THIR representation for `{}`", tcx.def_path_str(key) }
-    }
-
     /// Set of all the `DefId`s in this crate that have MIR associated with
     /// them. This includes all the body owners, but also things like struct
     /// constructors.

compiler/rustc_mir_build/src/lib.rs

@@ -34,6 +34,6 @@ pub fn provide(providers: &mut Providers) {
         build::closure_saved_names_of_captured_variables;
     providers.check_unsafety = check_unsafety::check_unsafety;
     providers.thir_body = thir::cx::thir_body;
-    providers.thir_tree = thir::print::thir_tree;
-    providers.thir_flat = thir::print::thir_flat;
+    providers.hooks.thir_tree = thir::print::thir_tree;
+    providers.hooks.thir_flat = thir::print::thir_flat;
 }

compiler/rustc_mir_build/src/thir/print.rs

@@ -1,10 +1,11 @@
+use rustc_middle::query::TyCtxtAt;
 use rustc_middle::thir::*;
-use rustc_middle::ty::{self, TyCtxt};
+use rustc_middle::ty;
 use rustc_span::def_id::LocalDefId;
 use std::fmt::{self, Write};
 
-pub(crate) fn thir_tree(tcx: TyCtxt<'_>, owner_def: LocalDefId) -> String {
-    match super::cx::thir_body(tcx, owner_def) {
+pub(crate) fn thir_tree(tcx: TyCtxtAt<'_>, owner_def: LocalDefId) -> String {
+    match super::cx::thir_body(*tcx, owner_def) {
         Ok((thir, _)) => {
             let thir = thir.steal();
             let mut printer = ThirPrinter::new(&thir);
@@ -15,8 +16,8 @@ pub(crate) fn thir_tree(tcx: TyCtxt<'_>, owner_def: LocalDefId) -> String {
     }
 }
 
-pub(crate) fn thir_flat(tcx: TyCtxt<'_>, owner_def: LocalDefId) -> String {
-    match super::cx::thir_body(tcx, owner_def) {
+pub(crate) fn thir_flat(tcx: TyCtxtAt<'_>, owner_def: LocalDefId) -> String {
+    match super::cx::thir_body(*tcx, owner_def) {
         Ok((thir, _)) => format!("{:#?}", thir.steal()),
         Err(_) => "error".into(),
     }