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Add AggregateKind::RawPtr and enough support to compile

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This commit is contained in:
Scott McMurray 2024-04-11 14:44:02 -07:00
parent 70df9d9a13
commit e6b2b764ec
11 changed files with 84 additions and 3 deletions
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38
compiler/rustc_const_eval/src/transform/validate.rs
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@ -923,6 +923,44 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
}
}
}
AggregateKind::RawPtr(pointee_ty, mutability) => {
if !matches!(self.mir_phase, MirPhase::Runtime(_)) {
// It would probably be fine to support this in earlier phases,
// but at the time of writing it's only ever introduced from intrinsic lowering,
// so earlier things just `bug!` on it.
self.fail(location, "RawPtr should be in runtime MIR only");
}
if fields.len() != 2 {
self.fail(location, "raw pointer aggregate must have 2 fields");
} else {
let data_ptr_ty = fields.raw[0].ty(self.body, self.tcx);
let metadata_ty = fields.raw[1].ty(self.body, self.tcx);
if let ty::RawPtr(in_pointee, in_mut) = data_ptr_ty.kind() {
if *in_mut != mutability {
self.fail(location, "input and output mutability must match");
}
// FIXME: check `Thin` instead of `Sized`
if !in_pointee.is_sized(self.tcx, self.param_env) {
self.fail(location, "input pointer must be thin");
}
} else {
self.fail(location, "first operand to raw pointer aggregate must be a raw pointer");
}
// FIXME: Check metadata more generally
if pointee_ty.is_slice() {
if !self.mir_assign_valid_types(metadata_ty, self.tcx.types.usize) {
self.fail(location, "slice metadata must be usize");
}
} else if pointee_ty.is_sized(self.tcx, self.param_env) {
if metadata_ty != self.tcx.types.unit {
self.fail(location, "metadata for pointer-to-thin must be unit");
}
}
}
}
},
Rvalue::Ref(_, BorrowKind::Fake, _) => {
if self.mir_phase >= MirPhase::Runtime(RuntimePhase::Initial) {