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lint: don't suggest assume_init for uninhabited types

This commit is contained in:
y21 2023-02-13 15:38:23 +01:00
parent 3eb5c4581a
commit 0610df9314
6 changed files with 32 additions and 59 deletions
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8
compiler/rustc_lint/src/builtin.rs
View File

@ -2635,7 +2635,13 @@ impl<'tcx> LateLintPass<'tcx> for InvalidValue {
cx.emit_spanned_lint(
INVALID_VALUE,
expr.span,
BuiltinUnpermittedTypeInit { msg, ty: conjured_ty, label: expr.span, sub },
BuiltinUnpermittedTypeInit {
msg,
ty: conjured_ty,
label: expr.span,
sub,
tcx: cx.tcx,
},
);
}
}

13
compiler/rustc_lint/src/lints.rs
View File

@ -8,7 +8,9 @@ use rustc_errors::{
};
use rustc_hir::def_id::DefId;
use rustc_macros::{LintDiagnostic, Subdiagnostic};
use rustc_middle::ty::{PolyExistentialTraitRef, Predicate, Ty, TyCtxt};
use rustc_middle::ty::{
inhabitedness::InhabitedPredicate, PolyExistentialTraitRef, Predicate, Ty, TyCtxt,
};
use rustc_session::parse::ParseSess;
use rustc_span::{edition::Edition, sym, symbol::Ident, Span, Symbol};
@ -419,6 +421,7 @@ pub struct BuiltinUnpermittedTypeInit<'a> {
pub ty: Ty<'a>,
pub label: Span,
pub sub: BuiltinUnpermittedTypeInitSub,
pub tcx: TyCtxt<'a>,
}
impl<'a> DecorateLint<'a, ()> for BuiltinUnpermittedTypeInit<'_> {
@ -428,7 +431,13 @@ impl<'a> DecorateLint<'a, ()> for BuiltinUnpermittedTypeInit<'_> {
) -> &'b mut rustc_errors::DiagnosticBuilder<'a, ()> {
diag.set_arg("ty", self.ty);
diag.span_label(self.label, fluent::lint_builtin_unpermitted_type_init_label);
diag.span_label(self.label, fluent::lint_builtin_unpermitted_type_init_label_suggestion);
if let InhabitedPredicate::True = self.ty.inhabited_predicate(self.tcx) {
// Only suggest late `MaybeUninit::assume_init` initialization if the type is inhabited.
diag.span_label(
self.label,
fluent::lint_builtin_unpermitted_type_init_label_suggestion,
);
}
self.sub.add_to_diagnostic(diag);
diag
}

10
tests/ui/consts/const-eval/validate_uninhabited_zsts.32bit.stderr
View File

@ -2,10 +2,7 @@ warning: the type `!` does not permit zero-initialization
--> $DIR/validate_uninhabited_zsts.rs:4:14
|
LL | unsafe { std::mem::transmute(()) }
| ^^^^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
= note: the `!` type has no valid value
= note: `#[warn(invalid_value)]` on by default
@ -40,10 +37,7 @@ warning: the type `empty::Empty` does not permit zero-initialization
--> $DIR/validate_uninhabited_zsts.rs:21:42
|
LL | const BAR: [empty::Empty; 3] = [unsafe { std::mem::transmute(()) }; 3];
| ^^^^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
note: in this struct field
--> $DIR/validate_uninhabited_zsts.rs:16:22

10
tests/ui/consts/const-eval/validate_uninhabited_zsts.64bit.stderr
View File

@ -2,10 +2,7 @@ warning: the type `!` does not permit zero-initialization
--> $DIR/validate_uninhabited_zsts.rs:4:14
|
LL | unsafe { std::mem::transmute(()) }
| ^^^^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
= note: the `!` type has no valid value
= note: `#[warn(invalid_value)]` on by default
@ -40,10 +37,7 @@ warning: the type `empty::Empty` does not permit zero-initialization
--> $DIR/validate_uninhabited_zsts.rs:21:42
|
LL | const BAR: [empty::Empty; 3] = [unsafe { std::mem::transmute(()) }; 3];
| ^^^^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
note: in this struct field
--> $DIR/validate_uninhabited_zsts.rs:16:22

40
tests/ui/lint/invalid_value.stderr
View File

@ -61,10 +61,7 @@ error: the type `!` does not permit zero-initialization
--> $DIR/invalid_value.rs:65:23
|
LL | let _val: ! = mem::zeroed();
| ^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
= note: the `!` type has no valid value
@ -72,10 +69,7 @@ error: the type `!` does not permit being left uninitialized
--> $DIR/invalid_value.rs:66:23
|
LL | let _val: ! = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
= note: the `!` type has no valid value
@ -83,10 +77,7 @@ error: the type `(i32, !)` does not permit zero-initialization
--> $DIR/invalid_value.rs:68:30
|
LL | let _val: (i32, !) = mem::zeroed();
| ^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
= note: the `!` type has no valid value
@ -94,10 +85,7 @@ error: the type `(i32, !)` does not permit being left uninitialized
--> $DIR/invalid_value.rs:69:30
|
LL | let _val: (i32, !) = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
= note: integers must be initialized
@ -105,10 +93,7 @@ error: the type `Void` does not permit zero-initialization
--> $DIR/invalid_value.rs:71:26
|
LL | let _val: Void = mem::zeroed();
| ^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
note: enums with no inhabited variants have no valid value
--> $DIR/invalid_value.rs:12:1
@ -120,10 +105,7 @@ error: the type `Void` does not permit being left uninitialized
--> $DIR/invalid_value.rs:72:26
|
LL | let _val: Void = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
note: enums with no inhabited variants have no valid value
--> $DIR/invalid_value.rs:12:1
@ -405,10 +387,7 @@ error: the type `TwoUninhabited` does not permit zero-initialization
--> $DIR/invalid_value.rs:104:36
|
LL | let _val: TwoUninhabited = mem::zeroed();
| ^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
note: enums with no inhabited variants have no valid value
--> $DIR/invalid_value.rs:42:1
@ -420,10 +399,7 @@ error: the type `TwoUninhabited` does not permit being left uninitialized
--> $DIR/invalid_value.rs:105:36
|
LL | let _val: TwoUninhabited = mem::uninitialized();
| ^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
note: enums with no inhabited variants have no valid value
--> $DIR/invalid_value.rs:42:1

10
tests/ui/statics/uninhabited-static.stderr
View File

@ -53,10 +53,7 @@ warning: the type `Void` does not permit zero-initialization
--> $DIR/uninhabited-static.rs:12:31
|
LL | static VOID2: Void = unsafe { std::mem::transmute(()) };
| ^^^^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
note: enums with no inhabited variants have no valid value
--> $DIR/uninhabited-static.rs:4:1
@ -75,10 +72,7 @@ warning: the type `Void` does not permit zero-initialization
--> $DIR/uninhabited-static.rs:16:32
|
LL | static NEVER2: Void = unsafe { std::mem::transmute(()) };
| ^^^^^^^^^^^^^^^^^^^^^^^
| |
| this code causes undefined behavior when executed
| help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
| ^^^^^^^^^^^^^^^^^^^^^^^ this code causes undefined behavior when executed
|
note: enums with no inhabited variants have no valid value
--> $DIR/uninhabited-static.rs:4:1