Auto merge of rust-lang#132460 - lcnr:questionable-uwu, r=compiler-errors

Use `TypingMode` throughout the compiler instead of `ParamEnv`

Hopefully the biggest single PR as part of rust-lang/types-team#128.

## `infcx.typing_env` while defining opaque types

I don't know how'll be able to correctly handle opaque types when using something taking a `TypingEnv` while defining opaque types. To correctly handle the opaques we need to be able to pass in the current `opaque_type_storage` and return constraints, i.e. we need to use a proper canonical query. We should migrate all the queries used during HIR typeck and borrowck where this matters to proper canonical queries. This is

## `layout_of` and `Reveal::All`

We convert the `ParamEnv` to `Reveal::All` right at the start of the `layout_of` query, so I've changed callers of `layout_of` to already use a post analysis `TypingEnv` when encountering it.

https://github.com/rust-lang/rust/blob/ca87b535a05097df6abbe2a031b057de2cefac5b/compiler/rustc_ty_utils/src/layout.rs#L51

## `Ty::is_[unpin|sized|whatever]`

I haven't migrated `fn is_item_raw` to use `TypingEnv`, will do so in a followup PR, this should significantly reduce the amount of `typing_env.param_env`. At some point there will probably be zero such uses as using the type system while ignoring the `typing_mode` is incorrect.

## `MirPhase` and phase-transitions

When inside of a MIR-body, we can mostly use its `MirPhase` to figure out the right `typing_mode`. This does not work during phase transitions, most notably when transitioning from `Analysis` to `Runtime`:

https://github.com/rust-lang/rust/blob/dae7ac133b9eda152784c075facb31a6688c92b1/compiler/rustc_mir_transform/src/lib.rs#L606-L625

All these passes still run with `MirPhase::Analysis`, but we should only use `Reveal::All` once we're run the `RevealAll` pass. This required me to manually construct the right `TypingEnv` in all these passes. Given that it feels somewhat easy to accidentally miss this going forward, I would maybe like to change `Body::phase` to an `Option` and replace it at the start of phase transitions. This then makes it clear that the MIR is currently in a weird state.

r? `@ghost`

Author: bors

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -682,8 +682,12 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
                 // Normalize before comparing to see through type aliases and projections.
                 let old_ty = ty::EarlyBinder::bind(ty).instantiate(tcx, generic_args);
                 let new_ty = ty::EarlyBinder::bind(ty).instantiate(tcx, new_args);
-                if let Ok(old_ty) = tcx.try_normalize_erasing_regions(self.param_env, old_ty)
-                    && let Ok(new_ty) = tcx.try_normalize_erasing_regions(self.param_env, new_ty)
+                if let Ok(old_ty) =
+                    tcx.try_normalize_erasing_regions(self.infcx.typing_env(self.param_env), old_ty)
+                    && let Ok(new_ty) = tcx.try_normalize_erasing_regions(
+                        self.infcx.typing_env(self.param_env),
+                        new_ty,
+                    )
                 {
                     old_ty == new_ty
                 } else {
@@ -703,7 +707,9 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
             // Test the callee's predicates, substituting in `ref_ty` for the moved argument type.
             clauses.instantiate(tcx, new_args).predicates.iter().all(|&(mut clause)| {
                 // Normalize before testing to see through type aliases and projections.
-                if let Ok(normalized) = tcx.try_normalize_erasing_regions(self.param_env, clause) {
+                if let Ok(normalized) =
+                    tcx.try_normalize_erasing_regions(self.infcx.typing_env(self.param_env), clause)
+                {
                     clause = normalized;
                 }
                 self.infcx.predicate_must_hold_modulo_regions(&Obligation::new(
@@ -3831,11 +3837,16 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
             if tcx.is_diagnostic_item(sym::deref_method, method_did) {
                 let deref_target =
                     tcx.get_diagnostic_item(sym::deref_target).and_then(|deref_target| {
-                        Instance::try_resolve(tcx, self.param_env, deref_target, method_args)
-                            .transpose()
+                        Instance::try_resolve(
+                            tcx,
+                            self.infcx.typing_env(self.param_env),
+                            deref_target,
+                            method_args,
+                        )
+                        .transpose()
                     });
                 if let Some(Ok(instance)) = deref_target {
-                    let deref_target_ty = instance.ty(tcx, self.param_env);
+                    let deref_target_ty = instance.ty(tcx, self.infcx.typing_env(self.param_env));
                     err.note(format!("borrow occurs due to deref coercion to `{deref_target_ty}`"));
                     err.span_note(tcx.def_span(instance.def_id()), "deref defined here");
                 }

compiler/rustc_borrowck/src/diagnostics/mod.rs

@@ -864,7 +864,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
 
             let kind = call_kind(
                 self.infcx.tcx,
-                self.param_env,
+                self.infcx.typing_env(self.param_env),
                 method_did,
                 method_args,
                 *fn_span,

compiler/rustc_borrowck/src/diagnostics/region_errors.rs

@@ -952,7 +952,7 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
 
             if let Ok(Some(instance)) = ty::Instance::try_resolve(
                 tcx,
-                self.param_env,
+                self.infcx.typing_env(self.param_env),
                 *fn_did,
                 self.infcx.resolve_vars_if_possible(args),
             ) {

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -1527,7 +1527,9 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                 // The signature in this call can reference region variables,
                 // so erase them before calling a query.
                 let output_ty = self.tcx().erase_regions(sig.output());
-                if !output_ty.is_privately_uninhabited(self.tcx(), self.param_env) {
+                if !output_ty
+                    .is_privately_uninhabited(self.tcx(), self.infcx.typing_env(self.param_env))
+                {
                     span_mirbug!(self, term, "call to converging function {:?} w/o dest", sig);
                 }
             }

compiler/rustc_codegen_cranelift/src/abi/mod.rs

@@ -376,7 +376,7 @@ pub(crate) fn codegen_terminator_call<'tcx>(
     let instance = if let ty::FnDef(def_id, fn_args) = *func.layout().ty.kind() {
         let instance = ty::Instance::expect_resolve(
             fx.tcx,
-            ty::ParamEnv::reveal_all(),
+            ty::TypingEnv::fully_monomorphized(),
             def_id,
             fn_args,
             source_info.span,

compiler/rustc_codegen_cranelift/src/base.rs

@@ -666,7 +666,7 @@ fn codegen_stmt<'tcx>(
                             let func_ref = fx.get_function_ref(
                                 Instance::resolve_for_fn_ptr(
                                     fx.tcx,
-                                    ParamEnv::reveal_all(),
+                                    ty::TypingEnv::fully_monomorphized(),
                                     def_id,
                                     args,
                                 )
@@ -841,14 +841,18 @@ fn codegen_stmt<'tcx>(
                     lval.write_cvalue(fx, CValue::by_val(operand, box_layout));
                 }
                 Rvalue::NullaryOp(ref null_op, ty) => {
-                    assert!(lval.layout().ty.is_sized(fx.tcx, ParamEnv::reveal_all()));
+                    assert!(lval.layout().ty.is_sized(fx.tcx, ty::ParamEnv::reveal_all()));
                     let layout = fx.layout_of(fx.monomorphize(ty));
                     let val = match null_op {
                         NullOp::SizeOf => layout.size.bytes(),
                         NullOp::AlignOf => layout.align.abi.bytes(),
                         NullOp::OffsetOf(fields) => fx
                             .tcx
-                            .offset_of_subfield(ParamEnv::reveal_all(), layout, fields.iter())
+                            .offset_of_subfield(
+                                ty::TypingEnv::fully_monomorphized(),
+                                layout,
+                                fields.iter(),
+                            )
                             .bytes(),
                         NullOp::UbChecks => {
                             let val = fx.tcx.sess.ub_checks();

compiler/rustc_codegen_cranelift/src/common.rs

@@ -103,11 +103,11 @@ fn clif_pair_type_from_ty<'tcx>(
 
 /// Is a pointer to this type a wide ptr?
 pub(crate) fn has_ptr_meta<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> bool {
-    if ty.is_sized(tcx, ParamEnv::reveal_all()) {
+    if ty.is_sized(tcx, ty::ParamEnv::reveal_all()) {
         return false;
     }
 
-    let tail = tcx.struct_tail_for_codegen(ty, ParamEnv::reveal_all());
+    let tail = tcx.struct_tail_for_codegen(ty, ty::TypingEnv::fully_monomorphized());
     match tail.kind() {
         ty::Foreign(..) => false,
         ty::Str | ty::Slice(..) | ty::Dynamic(..) => true,
@@ -339,9 +339,9 @@ impl<'tcx> rustc_abi::HasDataLayout for FunctionCx<'_, '_, 'tcx> {
     }
 }
 
-impl<'tcx> layout::HasParamEnv<'tcx> for FunctionCx<'_, '_, 'tcx> {
-    fn param_env(&self) -> ParamEnv<'tcx> {
-        ParamEnv::reveal_all()
+impl<'tcx> layout::HasTypingEnv<'tcx> for FunctionCx<'_, '_, 'tcx> {
+    fn typing_env(&self) -> ty::TypingEnv<'tcx> {
+        ty::TypingEnv::fully_monomorphized()
     }
 }
 
@@ -358,7 +358,7 @@ impl<'tcx> FunctionCx<'_, '_, 'tcx> {
     {
         self.instance.instantiate_mir_and_normalize_erasing_regions(
             self.tcx,
-            ty::ParamEnv::reveal_all(),
+            ty::TypingEnv::fully_monomorphized(),
             ty::EarlyBinder::bind(value),
         )
     }
@@ -497,9 +497,9 @@ impl<'tcx> rustc_abi::HasDataLayout for RevealAllLayoutCx<'tcx> {
     }
 }
 
-impl<'tcx> layout::HasParamEnv<'tcx> for RevealAllLayoutCx<'tcx> {
-    fn param_env(&self) -> ParamEnv<'tcx> {
-        ParamEnv::reveal_all()
+impl<'tcx> layout::HasTypingEnv<'tcx> for RevealAllLayoutCx<'tcx> {
+    fn typing_env(&self) -> ty::TypingEnv<'tcx> {
+        ty::TypingEnv::fully_monomorphized()
     }
 }
 

compiler/rustc_codegen_cranelift/src/constant.rs

@@ -78,7 +78,7 @@ pub(crate) fn eval_mir_constant<'tcx>(
     let cv = fx.monomorphize(constant.const_);
     // This cannot fail because we checked all required_consts in advance.
     let val = cv
-        .eval(fx.tcx, ty::ParamEnv::reveal_all(), constant.span)
+        .eval(fx.tcx, ty::TypingEnv::fully_monomorphized(), constant.span)
         .expect("erroneous constant missed by mono item collection");
     (val, cv.ty())
 }
@@ -265,8 +265,13 @@ fn data_id_for_static(
         assert!(!definition);
         assert!(!tcx.is_mutable_static(def_id));
 
-        let ty = instance.ty(tcx, ParamEnv::reveal_all());
-        let align = tcx.layout_of(ParamEnv::reveal_all().and(ty)).unwrap().align.pref.bytes();
+        let ty = instance.ty(tcx, ty::TypingEnv::fully_monomorphized());
+        let align = tcx
+            .layout_of(ty::TypingEnv::fully_monomorphized().as_query_input(ty))
+            .unwrap()
+            .align
+            .pref
+            .bytes();
 
         let linkage = if import_linkage == rustc_middle::mir::mono::Linkage::ExternalWeak
             || import_linkage == rustc_middle::mir::mono::Linkage::WeakAny

compiler/rustc_codegen_cranelift/src/debuginfo/mod.rs

@@ -210,7 +210,7 @@ impl DebugContext {
 
         type_names::push_generic_params(
             tcx,
-            tcx.normalize_erasing_regions(ty::ParamEnv::reveal_all(), args),
+            tcx.normalize_erasing_regions(ty::TypingEnv::fully_monomorphized(), args),
             &mut name,
         );
 
@@ -275,8 +275,10 @@ impl DebugContext {
         let span = tcx.def_span(def_id);
         let (file_id, line, _column) = self.get_span_loc(tcx, span, span);
 
-        let static_type = Instance::mono(tcx, def_id).ty(tcx, ty::ParamEnv::reveal_all());
-        let static_layout = tcx.layout_of(ty::ParamEnv::reveal_all().and(static_type)).unwrap();
+        let static_type = Instance::mono(tcx, def_id).ty(tcx, ty::TypingEnv::fully_monomorphized());
+        let static_layout = tcx
+            .layout_of(ty::TypingEnv::fully_monomorphized().as_query_input(static_type))
+            .unwrap();
         // FIXME use the actual type layout
         let type_id = self.debug_type(tcx, type_dbg, static_type);
 

compiler/rustc_codegen_cranelift/src/inline_asm.rs

@@ -92,7 +92,7 @@ pub(crate) fn codegen_inline_asm_terminator<'tcx>(
                 if let ty::FnDef(def_id, args) = *const_.ty().kind() {
                     let instance = ty::Instance::resolve_for_fn_ptr(
                         fx.tcx,
-                        ty::ParamEnv::reveal_all(),
+                        ty::TypingEnv::fully_monomorphized(),
                         def_id,
                         args,
                     )
@@ -227,11 +227,11 @@ pub(crate) fn codegen_naked_asm<'tcx>(
             InlineAsmOperand::Const { ref value } => {
                 let cv = instance.instantiate_mir_and_normalize_erasing_regions(
                     tcx,
-                    ty::ParamEnv::reveal_all(),
+                    ty::TypingEnv::fully_monomorphized(),
                     ty::EarlyBinder::bind(value.const_),
                 );
                 let const_value = cv
-                    .eval(tcx, ty::ParamEnv::reveal_all(), value.span)
+                    .eval(tcx, ty::TypingEnv::fully_monomorphized(), value.span)
                     .expect("erroneous constant missed by mono item collection");
 
                 let value = rustc_codegen_ssa::common::asm_const_to_str(
@@ -250,13 +250,13 @@ pub(crate) fn codegen_naked_asm<'tcx>(
 
                 let const_ = instance.instantiate_mir_and_normalize_erasing_regions(
                     tcx,
-                    ty::ParamEnv::reveal_all(),
+                    ty::TypingEnv::fully_monomorphized(),
                     ty::EarlyBinder::bind(value.const_),
                 );
                 if let ty::FnDef(def_id, args) = *const_.ty().kind() {
                     let instance = ty::Instance::resolve_for_fn_ptr(
                         tcx,
-                        ty::ParamEnv::reveal_all(),
+                        ty::TypingEnv::fully_monomorphized(),
                         def_id,
                         args,
                     )

compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs

@@ -20,7 +20,7 @@ mod simd;
 use cranelift_codegen::ir::AtomicRmwOp;
 use rustc_middle::ty;
 use rustc_middle::ty::GenericArgsRef;
-use rustc_middle::ty::layout::{HasParamEnv, ValidityRequirement};
+use rustc_middle::ty::layout::ValidityRequirement;
 use rustc_middle::ty::print::{with_no_trimmed_paths, with_no_visible_paths};
 use rustc_span::source_map::Spanned;
 use rustc_span::symbol::{Symbol, sym};
@@ -682,7 +682,10 @@ fn codegen_regular_intrinsic_call<'tcx>(
             if let Some(requirement) = requirement {
                 let do_panic = !fx
                     .tcx
-                    .check_validity_requirement((requirement, fx.param_env().and(ty)))
+                    .check_validity_requirement((
+                        requirement,
+                        ty::TypingEnv::fully_monomorphized().as_query_input(ty),
+                    ))
                     .expect("expect to have layout during codegen");
 
                 if do_panic {
@@ -741,7 +744,7 @@ fn codegen_regular_intrinsic_call<'tcx>(
 
             let const_val = fx
                 .tcx
-                .const_eval_instance(ParamEnv::reveal_all(), instance, source_info.span)
+                .const_eval_instance(ty::ParamEnv::reveal_all(), instance, source_info.span)
                 .unwrap();
             let val = crate::constant::codegen_const_value(fx, const_val, ret.layout().ty);
             ret.write_cvalue(fx, val);

compiler/rustc_codegen_cranelift/src/lib.rs

@@ -98,7 +98,7 @@ mod prelude {
     pub(crate) use rustc_middle::mir::{self, *};
     pub(crate) use rustc_middle::ty::layout::{LayoutOf, TyAndLayout};
     pub(crate) use rustc_middle::ty::{
-        self, FloatTy, Instance, InstanceKind, IntTy, ParamEnv, Ty, TyCtxt, UintTy,
+        self, FloatTy, Instance, InstanceKind, IntTy, Ty, TyCtxt, UintTy,
     };
     pub(crate) use rustc_span::Span;
 

compiler/rustc_codegen_cranelift/src/main_shim.rs

@@ -49,7 +49,7 @@ pub(crate) fn maybe_create_entry_wrapper(
         // regions must appear in the argument
         // listing.
         let main_ret_ty = tcx.normalize_erasing_regions(
-            ty::ParamEnv::reveal_all(),
+            ty::TypingEnv::fully_monomorphized(),
             main_ret_ty.no_bound_vars().unwrap(),
         );
 
@@ -113,7 +113,7 @@ pub(crate) fn maybe_create_entry_wrapper(
                     .unwrap();
                 let report = Instance::expect_resolve(
                     tcx,
-                    ParamEnv::reveal_all(),
+                    ty::TypingEnv::fully_monomorphized(),
                     report.def_id,
                     tcx.mk_args(&[GenericArg::from(main_ret_ty)]),
                     DUMMY_SP,
@@ -139,7 +139,7 @@ pub(crate) fn maybe_create_entry_wrapper(
                 let start_def_id = tcx.require_lang_item(LangItem::Start, None);
                 let start_instance = Instance::expect_resolve(
                     tcx,
-                    ParamEnv::reveal_all(),
+                    ty::TypingEnv::fully_monomorphized(),
                     start_def_id,
                     tcx.mk_args(&[main_ret_ty.into()]),
                     DUMMY_SP,

compiler/rustc_codegen_cranelift/src/unsize.rs

@@ -3,6 +3,7 @@
 //! [`PointerCoercion::Unsize`]: `rustc_middle::ty::adjustment::PointerCoercion::Unsize`
 
 use rustc_codegen_ssa::base::validate_trivial_unsize;
+use rustc_middle::ty::layout::HasTypingEnv;
 use rustc_middle::ty::print::{with_no_trimmed_paths, with_no_visible_paths};
 
 use crate::base::codegen_panic_nounwind;
@@ -23,7 +24,7 @@ pub(crate) fn unsized_info<'tcx>(
     old_info: Option<Value>,
 ) -> Value {
     let (source, target) =
-        fx.tcx.struct_lockstep_tails_for_codegen(source, target, ParamEnv::reveal_all());
+        fx.tcx.struct_lockstep_tails_for_codegen(source, target, fx.typing_env());
     match (&source.kind(), &target.kind()) {
         (&ty::Array(_, len), &ty::Slice(_)) => fx.bcx.ins().iconst(
             fx.pointer_type,

compiler/rustc_codegen_cranelift/src/value_and_place.rs

@@ -4,6 +4,7 @@ use cranelift_codegen::entity::EntityRef;
 use cranelift_codegen::ir::immediates::Offset32;
 use cranelift_frontend::Variable;
 use rustc_middle::ty::FnSig;
+use rustc_middle::ty::layout::HasTypingEnv;
 
 use crate::prelude::*;
 
@@ -884,19 +885,17 @@ pub(crate) fn assert_assignable<'tcx>(
             assert_assignable(fx, *a, *b, limit - 1);
         }
         (ty::FnPtr(..), ty::FnPtr(..)) => {
-            let from_sig = fx.tcx.normalize_erasing_late_bound_regions(
-                ParamEnv::reveal_all(),
-                from_ty.fn_sig(fx.tcx),
-            );
+            let from_sig = fx
+                .tcx
+                .normalize_erasing_late_bound_regions(fx.typing_env(), from_ty.fn_sig(fx.tcx));
             let FnSig {
                 inputs_and_output: types_from,
                 c_variadic: c_variadic_from,
                 safety: unsafety_from,
                 abi: abi_from,
             } = from_sig;
-            let to_sig = fx
-                .tcx
-                .normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), to_ty.fn_sig(fx.tcx));
+            let to_sig =
+                fx.tcx.normalize_erasing_late_bound_regions(fx.typing_env(), to_ty.fn_sig(fx.tcx));
             let FnSig {
                 inputs_and_output: types_to,
                 c_variadic: c_variadic_to,
@@ -932,9 +931,8 @@ pub(crate) fn assert_assignable<'tcx>(
         (&ty::Dynamic(from_traits, _, _from_kind), &ty::Dynamic(to_traits, _, _to_kind)) => {
             // FIXME(dyn-star): Do the right thing with DynKinds
             for (from, to) in from_traits.iter().zip(to_traits) {
-                let from =
-                    fx.tcx.normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), from);
-                let to = fx.tcx.normalize_erasing_late_bound_regions(ParamEnv::reveal_all(), to);
+                let from = fx.tcx.normalize_erasing_late_bound_regions(fx.typing_env(), from);
+                let to = fx.tcx.normalize_erasing_late_bound_regions(fx.typing_env(), to);
                 assert_eq!(
                     from, to,
                     "Can't write trait object of incompatible traits {:?} to place with traits {:?}\n\n{:#?}",