rust-lang/rust
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

Bounds-check with PtrMetadata instead of Len in MIR

Browse Source
This commit is contained in:
Scott McMurray
2024-12-01 20:14:04 -08:00
parent 490b2cc098
commit 612adbb6bf
100 changed files with 1431 additions and 1665 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
compiler/rustc_mir_transform/src/instsimplify.rs
View File

@@ -47,7 +47,6 @@ impl<'tcx> crate::MirPass<'tcx> for InstSimplify {
}
ctx.simplify_bool_cmp(rvalue);
ctx.simplify_ref_deref(rvalue);
ctx.simplify_len(rvalue);
ctx.simplify_ptr_aggregate(rvalue);
ctx.simplify_cast(rvalue);
}
@@ -132,18 +131,6 @@ impl<'tcx> InstSimplifyContext<'_, 'tcx> {
}
}
/// Transform `Len([_; N])` ==> `N`.
fn simplify_len(&self, rvalue: &mut Rvalue<'tcx>) {
if let Rvalue::Len(ref place) = *rvalue {
let place_ty = place.ty(self.local_decls, self.tcx).ty;
if let ty::Array(_, len) = *place_ty.kind() {
let const_ = Const::from_ty_const(len, self.tcx.types.usize, self.tcx);
let constant = ConstOperand { span: DUMMY_SP, const_, user_ty: None };
*rvalue = Rvalue::Use(Operand::Constant(Box::new(constant)));
}
}
}
/// Transform `Aggregate(RawPtr, [p, ()])` ==> `Cast(PtrToPtr, p)`.
fn simplify_ptr_aggregate(&self, rvalue: &mut Rvalue<'tcx>) {
if let Rvalue::Aggregate(box AggregateKind::RawPtr(pointee_ty, mutability), fields) = rvalue