treat host effect params as erased generics in codegen

This fixes the changes brought to codegen tests when effect params are
added to libcore, by not attempting to monomorphize functions that get
the host param by being `const fn`.

2 files changed, 27 insertions, 15 deletions

diff --git a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
index 8fb2ccb7e8a..5b869bed0a0 100644
--- a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
+++ b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
@@ -334,7 +334,7 @@ fn exported_symbols_provider_local(
 
             match *mono_item {
                 MonoItem::Fn(Instance { def: InstanceDef::Item(def), args }) => {
-                    if args.non_erasable_generics().next().is_some() {
+                    if args.non_erasable_generics(tcx, def).next().is_some() {
                         let symbol = ExportedSymbol::Generic(def, args);
                         symbols.push((
                             symbol,
@@ -346,10 +346,10 @@ fn exported_symbols_provider_local(
                         ));
                     }
                 }
-                MonoItem::Fn(Instance { def: InstanceDef::DropGlue(_, Some(ty)), args }) => {
+                MonoItem::Fn(Instance { def: InstanceDef::DropGlue(def_id, Some(ty)), args }) => {
                     // A little sanity-check
                     debug_assert_eq!(
-                        args.non_erasable_generics().next(),
+                        args.non_erasable_generics(tcx, def_id).next(),
                         Some(GenericArgKind::Type(ty))
                     );
                     symbols.push((
diff --git a/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs b/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs
index 067c824aba0..d195e1fc02f 100644
--- a/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs
+++ b/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs
@@ -106,14 +106,14 @@ fn push_debuginfo_type_name<'tcx>(
                     ty_and_layout,
                     &|output, visited| {
                         push_item_name(tcx, def.did(), true, output);
-                        push_generic_params_internal(tcx, args, output, visited);
+                        push_generic_params_internal(tcx, args, def.did(), output, visited);
                     },
                     output,
                     visited,
                 );
             } else {
                 push_item_name(tcx, def.did(), qualified, output);
-                push_generic_params_internal(tcx, args, output, visited);
+                push_generic_params_internal(tcx, args, def.did(), output, visited);
             }
         }
         ty::Tuple(component_types) => {
@@ -237,8 +237,13 @@ fn push_debuginfo_type_name<'tcx>(
                 let principal =
                     tcx.normalize_erasing_late_bound_regions(ty::ParamEnv::reveal_all(), principal);
                 push_item_name(tcx, principal.def_id, qualified, output);
-                let principal_has_generic_params =
-                    push_generic_params_internal(tcx, principal.args, output, visited);
+                let principal_has_generic_params = push_generic_params_internal(
+                    tcx,
+                    principal.args,
+                    principal.def_id,
+                    output,
+                    visited,
+                );
 
                 let projection_bounds: SmallVec<[_; 4]> = trait_data
                     .projection_bounds()
@@ -516,7 +521,13 @@ pub fn compute_debuginfo_vtable_name<'tcx>(
             tcx.normalize_erasing_late_bound_regions(ty::ParamEnv::reveal_all(), trait_ref);
         push_item_name(tcx, trait_ref.def_id, true, &mut vtable_name);
         visited.clear();
-        push_generic_params_internal(tcx, trait_ref.args, &mut vtable_name, &mut visited);
+        push_generic_params_internal(
+            tcx,
+            trait_ref.args,
+            trait_ref.def_id,
+            &mut vtable_name,
+            &mut visited,
+        );
     } else {
         vtable_name.push('_');
     }
@@ -610,20 +621,20 @@ fn push_unqualified_item_name(
 fn push_generic_params_internal<'tcx>(
     tcx: TyCtxt<'tcx>,
     args: GenericArgsRef<'tcx>,
+    def_id: DefId,
     output: &mut String,
     visited: &mut FxHashSet<Ty<'tcx>>,
 ) -> bool {
-    if args.non_erasable_generics().next().is_none() {
+    debug_assert_eq!(args, tcx.normalize_erasing_regions(ty::ParamEnv::reveal_all(), args));
+    let mut args = args.non_erasable_generics(tcx, def_id).peekable();
+    if args.peek().is_none() {
         return false;
     }
-
-    debug_assert_eq!(args, tcx.normalize_erasing_regions(ty::ParamEnv::reveal_all(), args));
-
     let cpp_like_debuginfo = cpp_like_debuginfo(tcx);
 
     output.push('<');
 
-    for type_parameter in args.non_erasable_generics() {
+    for type_parameter in args {
         match type_parameter {
             GenericArgKind::Type(type_parameter) => {
                 push_debuginfo_type_name(tcx, type_parameter, true, output, visited);
@@ -691,11 +702,12 @@ fn push_const_param<'tcx>(tcx: TyCtxt<'tcx>, ct: ty::Const<'tcx>, output: &mut S
 pub fn push_generic_params<'tcx>(
     tcx: TyCtxt<'tcx>,
     args: GenericArgsRef<'tcx>,
+    def_id: DefId,
     output: &mut String,
 ) {
     let _prof = tcx.prof.generic_activity("compute_debuginfo_type_name");
     let mut visited = FxHashSet::default();
-    push_generic_params_internal(tcx, args, output, &mut visited);
+    push_generic_params_internal(tcx, args, def_id, output, &mut visited);
 }
 
 fn push_closure_or_generator_name<'tcx>(
@@ -738,7 +750,7 @@ fn push_closure_or_generator_name<'tcx>(
     // Truncate the args to the length of the above generics. This will cut off
     // anything closure- or generator-specific.
     let args = args.truncate_to(tcx, generics);
-    push_generic_params_internal(tcx, args, output, visited);
+    push_generic_params_internal(tcx, args, enclosing_fn_def_id, output, visited);
 }
 
 fn push_close_angle_bracket(cpp_like_debuginfo: bool, output: &mut String) {