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Add a pointer to address cast kind

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A pointer to address cast are often special-cased.
Introduce a dedicated cast kind to make them easy distinguishable.
This commit is contained in:
Tomasz Miąsko
2022-05-31 00:00:00 +00:00
parent d35d972e69
commit dff602fc18
15 changed files with 96 additions and 94 deletions
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13
compiler/rustc_const_eval/src/transform/check_consts/check.rs
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@@ -8,7 +8,6 @@ use rustc_infer::infer::TyCtxtInferExt;
use rustc_infer::traits::{ImplSource, Obligation, ObligationCause};
use rustc_middle::mir::visit::{MutatingUseContext, NonMutatingUseContext, PlaceContext, Visitor};
use rustc_middle::mir::*;
use rustc_middle::ty::cast::CastTy;
use rustc_middle::ty::subst::{GenericArgKind, InternalSubsts};
use rustc_middle::ty::{self, adjustment::PointerCast, Instance, InstanceDef, Ty, TyCtxt};
use rustc_middle::ty::{Binder, TraitPredicate, TraitRef, TypeFoldable};
@@ -543,16 +542,12 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
// in the type of any local, which also excludes casts).
}
Rvalue::Cast(CastKind::Misc, ref operand, cast_ty) => {
let operand_ty = operand.ty(self.body, self.tcx);
let cast_in = CastTy::from_ty(operand_ty).expect("bad input type for cast");
let cast_out = CastTy::from_ty(cast_ty).expect("bad output type for cast");
if let (CastTy::Ptr(_) | CastTy::FnPtr, CastTy::Int(_)) = (cast_in, cast_out) {
self.check_op(ops::RawPtrToIntCast);
}
Rvalue::Cast(CastKind::PointerAddress, _, _) => {
self.check_op(ops::RawPtrToIntCast);
}
Rvalue::Cast(CastKind::Misc, _, _) => {}
Rvalue::NullaryOp(NullOp::SizeOf | NullOp::AlignOf, _) => {}
Rvalue::ShallowInitBox(_, _) => {}