Auto merge of rust-lang#121387 - oli-obk:eager_const_failures_regression, r=<try>

Avoid some unnecessary query invocations.

Specifically this inlines `const_eval_poly` and avoids computing the generic params, the param env, normalizing the param env and erasing lifetimes on everything.

should fix the perf regression from rust-lang#121087

Author: bors

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -11,6 +11,7 @@ use rustc_hir::lang_items::LangItem;
 use rustc_hir::ItemKind;
 use rustc_infer::infer::outlives::env::OutlivesEnvironment;
 use rustc_infer::infer::{self, InferCtxt, TyCtxtInferExt};
+use rustc_middle::mir::interpret::GlobalId;
 use rustc_middle::query::Providers;
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::trait_def::TraitSpecializationKind;
@@ -291,9 +292,16 @@ fn check_item<'tcx>(tcx: TyCtxt<'tcx>, item: &'tcx hir::Item<'tcx>) -> Result<()
             check_item_fn(tcx, def_id, item.ident, item.span, sig.decl)
         }
         hir::ItemKind::Static(ty, ..) => {
+            tcx.ensure().eval_static_initializer(def_id);
             check_item_type(tcx, def_id, ty.span, UnsizedHandling::Forbid)
         }
-        hir::ItemKind::Const(ty, ..) => {
+        hir::ItemKind::Const(ty, ast_generics, _) => {
+            if ast_generics.params.is_empty() {
+                let instance = ty::Instance::new(def_id.into(), ty::GenericArgs::empty());
+                let cid = GlobalId { instance, promoted: None };
+                let param_env = ty::ParamEnv::reveal_all();
+                tcx.ensure().eval_to_const_value_raw(param_env.and(cid));
+            }
             check_item_type(tcx, def_id, ty.span, UnsizedHandling::Forbid)
         }
         hir::ItemKind::Struct(_, ast_generics) => {

compiler/rustc_hir_analysis/src/lib.rs

@@ -198,17 +198,6 @@ pub fn check_crate(tcx: TyCtxt<'_>) -> Result<(), ErrorGuaranteed> {
         collect::test_opaque_hidden_types(tcx)?;
     }
 
-    // Make sure we evaluate all static and (non-associated) const items, even if unused.
-    // If any of these fail to evaluate, we do not want this crate to pass compilation.
-    tcx.hir().par_body_owners(|item_def_id| {
-        let def_kind = tcx.def_kind(item_def_id);
-        match def_kind {
-            DefKind::Static(_) => tcx.ensure().eval_static_initializer(item_def_id),
-            DefKind::Const => tcx.ensure().const_eval_poly(item_def_id.into()),
-            _ => (),
-        }
-    });
-
     // Freeze definitions as we don't add new ones at this point. This improves performance by
     // allowing lock-free access to them.
     tcx.untracked().definitions.freeze();

tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-impl.stderr

@@ -30,7 +30,11 @@ note: ...which requires elaborating drops for `<impl at $DIR/issue-24949-assoc-c
 LL |     const BAR: u32 = IMPL_REF_BAR;
    |                      ^^^^^^^^^^^^
    = note: ...which again requires simplifying constant for the type system `IMPL_REF_BAR`, completing the cycle
-   = note: cycle used when running analysis passes on this crate
+note: cycle used when checking that `IMPL_REF_BAR` is well-formed
+  --> $DIR/issue-24949-assoc-const-static-recursion-impl.rs:7:1
+   |
+LL | const IMPL_REF_BAR: u32 = GlobalImplRef::BAR;
+   | ^^^^^^^^^^^^^^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: aborting due to 1 previous error

tests/ui/associated-consts/issue-24949-assoc-const-static-recursion-trait.stderr

@@ -30,7 +30,11 @@ note: ...which requires elaborating drops for `<impl at $DIR/issue-24949-assoc-c
 LL |     const BAR: u32 = TRAIT_REF_BAR;
    |                      ^^^^^^^^^^^^^
    = note: ...which again requires simplifying constant for the type system `TRAIT_REF_BAR`, completing the cycle
-   = note: cycle used when running analysis passes on this crate
+note: cycle used when checking that `TRAIT_REF_BAR` is well-formed
+  --> $DIR/issue-24949-assoc-const-static-recursion-trait.rs:7:1
+   |
+LL | const TRAIT_REF_BAR: u32 = <GlobalTraitRef>::BAR;
+   | ^^^^^^^^^^^^^^^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: aborting due to 1 previous error

tests/ui/associated-inherent-types/generic-associated-types-bad.item.stderr

@@ -1,8 +1,8 @@
 error[E0277]: the trait bound `String: Copy` is not satisfied
-  --> $DIR/generic-associated-types-bad.rs:16:10
+  --> $DIR/generic-associated-types-bad.rs:16:27
    |
 LL | const _: Ty::Pr<String> = String::new();
-   |          ^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `String`
+   |                           ^^^^^^^^^^^^^ the trait `Copy` is not implemented for `String`
    |
 note: required by a bound in `Ty::Pr`
   --> $DIR/generic-associated-types-bad.rs:10:16
@@ -11,10 +11,10 @@ LL |     type Pr<T: Copy> = T;
    |                ^^^^ required by this bound in `Ty::Pr`
 
 error[E0277]: the trait bound `String: Copy` is not satisfied
-  --> $DIR/generic-associated-types-bad.rs:16:27
+  --> $DIR/generic-associated-types-bad.rs:16:10
    |
 LL | const _: Ty::Pr<String> = String::new();
-   |                           ^^^^^^^^^^^^^ the trait `Copy` is not implemented for `String`
+   |          ^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `String`
    |
 note: required by a bound in `Ty::Pr`
   --> $DIR/generic-associated-types-bad.rs:10:16

tests/ui/consts/const-array-oob.stderr

@@ -1,15 +1,15 @@
-error[E0080]: evaluation of constant value failed
-  --> $DIR/const-array-oob.rs:5:19
-   |
-LL | const BLUB: [u32; FOO[4]] = [5, 6];
-   |                   ^^^^^^ index out of bounds: the length is 3 but the index is 4
-
 error[E0080]: evaluation of constant value failed
   --> $DIR/const-array-oob.rs:2:20
    |
 LL | const BAR: usize = FOO[5];
    |                    ^^^^^^ index out of bounds: the length is 3 but the index is 5
 
+error[E0080]: evaluation of constant value failed
+  --> $DIR/const-array-oob.rs:5:19
+   |
+LL | const BLUB: [u32; FOO[4]] = [5, 6];
+   |                   ^^^^^^ index out of bounds: the length is 3 but the index is 4
+
 error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0080`.

tests/ui/consts/const-eval/const-eval-query-stack.stderr

@@ -7,5 +7,7 @@ LL | const X: i32 = 1 / 0;
 query stack during panic:
 #0 [eval_to_allocation_raw] const-evaluating + checking `X`
 #1 [eval_to_const_value_raw] simplifying constant for the type system `X`
-#2 [analysis] running analysis passes on this crate
+#2 [check_well_formed] checking that `X` is well-formed
+#3 [check_mod_type_wf] checking that types are well-formed in top-level module
+#4 [analysis] running analysis passes on this crate
 end of query stack

tests/ui/consts/const-unsized.stderr

@@ -1,70 +1,70 @@
 error[E0277]: the size for values of type `(dyn Debug + Sync + 'static)` cannot be known at compilation time
-  --> $DIR/const-unsized.rs:3:16
+  --> $DIR/const-unsized.rs:3:35
    |
 LL | const CONST_0: dyn Debug + Sync = *(&0 as &(dyn Debug + Sync));
-   |                ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+   |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `(dyn Debug + Sync + 'static)`
+   = note: constant expressions must have a statically known size
 
 error[E0277]: the size for values of type `(dyn Debug + Sync + 'static)` cannot be known at compilation time
-  --> $DIR/const-unsized.rs:3:35
+  --> $DIR/const-unsized.rs:3:16
    |
 LL | const CONST_0: dyn Debug + Sync = *(&0 as &(dyn Debug + Sync));
-   |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+   |                ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `(dyn Debug + Sync + 'static)`
-   = note: constant expressions must have a statically known size
 
 error[E0277]: the size for values of type `str` cannot be known at compilation time
-  --> $DIR/const-unsized.rs:7:18
+  --> $DIR/const-unsized.rs:7:24
    |
 LL | const CONST_FOO: str = *"foo";
-   |                  ^^^ doesn't have a size known at compile-time
+   |                        ^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `str`
+   = note: constant expressions must have a statically known size
 
 error[E0277]: the size for values of type `str` cannot be known at compilation time
-  --> $DIR/const-unsized.rs:7:24
+  --> $DIR/const-unsized.rs:7:18
    |
 LL | const CONST_FOO: str = *"foo";
-   |                        ^^^^^^ doesn't have a size known at compile-time
+   |                  ^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `str`
-   = note: constant expressions must have a statically known size
 
 error[E0277]: the size for values of type `(dyn Debug + Sync + 'static)` cannot be known at compilation time
-  --> $DIR/const-unsized.rs:11:18
+  --> $DIR/const-unsized.rs:11:37
    |
 LL | static STATIC_1: dyn Debug + Sync = *(&1 as &(dyn Debug + Sync));
-   |                  ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+   |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `(dyn Debug + Sync + 'static)`
+   = note: constant expressions must have a statically known size
 
 error[E0277]: the size for values of type `(dyn Debug + Sync + 'static)` cannot be known at compilation time
-  --> $DIR/const-unsized.rs:11:37
+  --> $DIR/const-unsized.rs:11:18
    |
 LL | static STATIC_1: dyn Debug + Sync = *(&1 as &(dyn Debug + Sync));
-   |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+   |                  ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `(dyn Debug + Sync + 'static)`
-   = note: constant expressions must have a statically known size
 
 error[E0277]: the size for values of type `str` cannot be known at compilation time
-  --> $DIR/const-unsized.rs:15:20
+  --> $DIR/const-unsized.rs:15:26
    |
 LL | static STATIC_BAR: str = *"bar";
-   |                    ^^^ doesn't have a size known at compile-time
+   |                          ^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `str`
+   = note: constant expressions must have a statically known size
 
 error[E0277]: the size for values of type `str` cannot be known at compilation time
-  --> $DIR/const-unsized.rs:15:26
+  --> $DIR/const-unsized.rs:15:20
    |
 LL | static STATIC_BAR: str = *"bar";
-   |                          ^^^^^^ doesn't have a size known at compile-time
+   |                    ^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `str`
-   = note: constant expressions must have a statically known size
 
 error[E0161]: cannot move a value of type `str`
   --> $DIR/const-unsized.rs:20:48

tests/ui/consts/const_cmp_type_id.stderr

@@ -1,15 +1,15 @@
-error[E0131]: `main` function is not allowed to have generic parameters
-  --> $DIR/const_cmp_type_id.rs:7:14
-   |
-LL | const fn main() {
-   |              ^ `main` cannot have generic parameters
-
 error[E0080]: evaluation of constant value failed
   --> $DIR/const_cmp_type_id.rs:10:22
    |
 LL |     const _A: bool = TypeId::of::<u8>() < TypeId::of::<u16>();
    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ calling non-const function `<TypeId as PartialOrd>::lt`
 
+error[E0131]: `main` function is not allowed to have generic parameters
+  --> $DIR/const_cmp_type_id.rs:7:14
+   |
+LL | const fn main() {
+   |              ^ `main` cannot have generic parameters
+
 error[E0308]: mismatched types
   --> $DIR/const_cmp_type_id.rs:8:13
    |

tests/ui/consts/recursive-zst-static.default.stderr

@@ -16,7 +16,11 @@ note: ...which requires evaluating initializer of static `B`...
 LL | static B: () = A;
    |                ^
    = note: ...which again requires evaluating initializer of static `A`, completing the cycle
-   = note: cycle used when running analysis passes on this crate
+note: cycle used when checking that `A` is well-formed
+  --> $DIR/recursive-zst-static.rs:13:1
+   |
+LL | static A: () = B;
+   | ^^^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: aborting due to 2 previous errors