bjoernager/rust
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Improve safe transmute error reporting

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This patch updates the error reporting when Safe Transmute is not
possible between 2 types by including the reason.

Also, fix some small bugs that occur when computing the `Answer` for
transmutability.
This commit is contained in:
Bryan Garza 2023-04-06 01:58:53 +00:00
parent 59a05ad118
commit 36febe1f4d
29 changed files with 495 additions and 593 deletions
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28
compiler/rustc_transmute/src/layout/tree.rs
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@ -167,31 +167,31 @@ where
}
}
#[derive(Debug, Copy, Clone)]
pub(crate) enum Err {
/// The layout of the type is unspecified.
Unspecified,
/// This error will be surfaced elsewhere by rustc, so don't surface it.
Unknown,
}
#[cfg(feature = "rustc")]
pub(crate) mod rustc {
use super::{Err, Tree};
use super::Tree;
use crate::layout::rustc::{Def, Ref};
use rustc_middle::ty;
use rustc_middle::ty::layout::LayoutError;
use rustc_middle::ty::util::Discr;
use rustc_middle::ty::AdtDef;
use rustc_middle::ty::ParamEnv;
use rustc_middle::ty::SubstsRef;
use rustc_middle::ty::Ty;
use rustc_middle::ty::TyCtxt;
use rustc_middle::ty::VariantDef;
use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt};
use rustc_span::ErrorGuaranteed;
use rustc_target::abi::Align;
use std::alloc;
#[derive(Debug, Copy, Clone)]
pub(crate) enum Err {
/// The layout of the type is unspecified.
Unspecified,
/// This error will be surfaced elsewhere by rustc, so don't surface it.
Unknown,
TypeError(ErrorGuaranteed),
}
impl<'tcx> From<LayoutError<'tcx>> for Err {
fn from(err: LayoutError<'tcx>) -> Self {
match err {
@ -261,6 +261,10 @@ pub(crate) mod rustc {
use rustc_middle::ty::UintTy::*;
use rustc_target::abi::HasDataLayout;
if let Err(e) = ty.error_reported() {
return Err(Err::TypeError(e));
}
let target = tcx.data_layout();
match ty.kind() {