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Remove a use of StructuredDiag, which is incompatible with automatic error tainting and error translations

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This commit is contained in:
Oli Scherer 2024-07-04 12:20:51 +00:00
parent 486bc278ab
commit 0d54fe0d02
9 changed files with 43 additions and 78 deletions
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2
compiler/rustc_hir_analysis/messages.ftl
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@ -55,8 +55,6 @@ hir_analysis_cannot_capture_late_bound_ty =
cannot capture late-bound type parameter in {$what}
.label = parameter defined here
hir_analysis_cast_thin_pointer_to_fat_pointer = cannot cast thin pointer `{$expr_ty}` to fat pointer `{$cast_ty}`
hir_analysis_closure_implicit_hrtb = implicit types in closure signatures are forbidden when `for<...>` is present
.label = `for<...>` is here

9
compiler/rustc_hir_analysis/src/errors.rs
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@ -707,15 +707,6 @@ pub(crate) struct PassToVariadicFunction<'tcx, 'a> {
pub help: Option<()>,
}
#[derive(Diagnostic)]
#[diag(hir_analysis_cast_thin_pointer_to_fat_pointer, code = E0607)]
pub(crate) struct CastThinPointerToFatPointer<'tcx> {
#[primary_span]
pub span: Span,
pub expr_ty: Ty<'tcx>,
pub cast_ty: String,
}
#[derive(Diagnostic)]
#[diag(hir_analysis_invalid_union_field, code = E0740)]
pub(crate) struct InvalidUnionField {

5
compiler/rustc_hir_analysis/src/structured_errors.rs
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@ -1,10 +1,7 @@
mod missing_cast_for_variadic_arg;
mod sized_unsized_cast;
mod wrong_number_of_generic_args;
pub use self::{
missing_cast_for_variadic_arg::*, sized_unsized_cast::*, wrong_number_of_generic_args::*,
};
pub use self::{missing_cast_for_variadic_arg::*, wrong_number_of_generic_args::*};
use rustc_errors::{Diag, ErrCode};
use rustc_session::Session;

56
compiler/rustc_hir_analysis/src/structured_errors/sized_unsized_cast.rs
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@ -1,56 +0,0 @@
use crate::{errors, structured_errors::StructuredDiag};
use rustc_errors::{codes::*, Diag};
use rustc_middle::ty::{Ty, TypeVisitableExt};
use rustc_session::Session;
use rustc_span::Span;
pub struct SizedUnsizedCast<'tcx> {
pub sess: &'tcx Session,
pub span: Span,
pub expr_ty: Ty<'tcx>,
pub cast_ty: String,
}
impl<'tcx> StructuredDiag<'tcx> for SizedUnsizedCast<'tcx> {
fn session(&self) -> &Session {
self.sess
}
fn code(&self) -> ErrCode {
E0607
}
fn diagnostic_common(&self) -> Diag<'tcx> {
let mut err = self.sess.dcx().create_err(errors::CastThinPointerToFatPointer {
span: self.span,
expr_ty: self.expr_ty,
cast_ty: self.cast_ty.to_owned(),
});
if self.expr_ty.references_error() {
err.downgrade_to_delayed_bug();
}
err
}
fn diagnostic_extended(&self, mut err: Diag<'tcx>) -> Diag<'tcx> {
err.help(
"Thin pointers are \"simple\" pointers: they are purely a reference to a
memory address.
Fat pointers are pointers referencing \"Dynamically Sized Types\" (also
called DST). DST don't have a statically known size, therefore they can
only exist behind some kind of pointers that contain additional
information. Slices and trait objects are DSTs. In the case of slices,
the additional information the fat pointer holds is their size.
To fix this error, don't try to cast directly between thin and fat
pointers.
For more information about casts, take a look at The Book:
https://doc.rust-lang.org/reference/expressions/operator-expr.html#type-cast-expressions",
);
err
}
}

15
compiler/rustc_hir_typeck/messages.ftl
View File

@ -23,6 +23,21 @@ hir_typeck_cannot_cast_to_bool = cannot cast `{$expr_ty}` as `bool`
hir_typeck_cast_enum_drop = cannot cast enum `{$expr_ty}` into integer `{$cast_ty}` because it implements `Drop`
hir_typeck_cast_thin_pointer_to_fat_pointer = cannot cast thin pointer `{$expr_ty}` to fat pointer `{$cast_ty}`
.teach_help = Thin pointers are "simple" pointers: they are purely a reference to a
memory address.
Fat pointers are pointers referencing "Dynamically Sized Types" (also
called DST). DST don't have a statically known size, therefore they can
only exist behind some kind of pointers that contain additional
information. Slices and trait objects are DSTs. In the case of slices,
the additional information the fat pointer holds is their size.
To fix this error, don't try to cast directly between thin and fat
pointers.
For more information about casts, take a look at The Book:
https://doc.rust-lang.org/reference/expressions/operator-expr.html#type-cast-expressions",
hir_typeck_cast_unknown_pointer = cannot cast {$to ->
[true] to
*[false] from

10
compiler/rustc_hir_typeck/src/cast.rs
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@ -500,16 +500,12 @@ fn report_cast_error(&self, fcx: &FnCtxt<'a, 'tcx>, e: CastError) {
err.emit();
}
CastError::SizedUnsizedCast => {
use rustc_hir_analysis::structured_errors::{SizedUnsizedCast, StructuredDiag};
SizedUnsizedCast {
sess: fcx.tcx.sess,
fcx.dcx().emit_err(errors::CastThinPointerToFatPointer {
span: self.span,
expr_ty: self.expr_ty,
cast_ty: fcx.ty_to_string(self.cast_ty),
}
.diagnostic()
.emit();
teach: fcx.tcx.sess.teach(E0607).then_some(()),
});
}
CastError::IntToFatCast(known_metadata) => {
let expr_if_nightly = fcx.tcx.sess.is_nightly_build().then_some(self.expr_span);

11
compiler/rustc_hir_typeck/src/errors.rs
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@ -689,3 +689,14 @@ pub struct ReplaceWithName {
pub span: Span,
pub name: String,
}
#[derive(Diagnostic)]
#[diag(hir_typeck_cast_thin_pointer_to_fat_pointer, code = E0607)]
pub(crate) struct CastThinPointerToFatPointer<'tcx> {
#[primary_span]
pub span: Span,
pub expr_ty: Ty<'tcx>,
pub cast_ty: String,
#[note(hir_typeck_teach_help)]
pub(crate) teach: Option<()>,
}

4
tests/ui/consts/slice_elem_ty_mismatch_in_unsizing_cast.rs Normal file
View File

@ -0,0 +1,4 @@
const FOO: &str = unsafe { &*(1_usize as *const [i64; 0] as *const [u8] as *const str) };
//~^ ERROR: cannot cast
fn main() {}

9
tests/ui/consts/slice_elem_ty_mismatch_in_unsizing_cast.stderr Normal file
View File

@ -0,0 +1,9 @@
error[E0607]: cannot cast thin pointer `*const [i64; 0]` to fat pointer `*const [u8]`
--> $DIR/slice_elem_ty_mismatch_in_unsizing_cast.rs:1:31
|
LL | const FOO: &str = unsafe { &*(1_usize as *const [i64; 0] as *const [u8] as *const str) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0607`.