Struct rustc_mir::interpret::validity::ValidityVisitor

struct ValidityVisitor<'rt, 'mir, 'tcx, M: Machine<'mir, 'tcx>> {
    path: Vec<PathElem>,
    ref_tracking: Option<&'rt mut RefTracking<MPlaceTy<'tcx, M::PointerTag>, Vec<PathElem>>>,
    ctfe_mode: Option<CtfeValidationMode>,
    ecx: &'rt InterpCx<'mir, 'tcx, M>,
}

Fields

path: Vec<PathElem>

The path may be pushed to, but the part that is present when a function starts must not be changed! visit_fields and visit_array rely on this stack discipline.

ref_tracking: Option<&'rt mut RefTracking<MPlaceTy<'tcx, M::PointerTag>, Vec<PathElem>>>

ctfe_mode: Option<CtfeValidationMode>

None indicates this is not validating for CTFE (but for runtime).

ecx: &'rt InterpCx<'mir, 'tcx, M>

Implementations

impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, 'tcx, M>

fn aggregate_field_path_elem(
    &mut self,
    layout: TyAndLayout<'tcx>,
    field: usize
) -> PathElem

fn with_elem<R>(
    &mut self,
    elem: PathElem,
    f: impl FnOnce(&mut Self) -> InterpResult<'tcx, R>
) -> InterpResult<'tcx, R>

fn check_wide_ptr_meta(
    &mut self,
    meta: MemPlaceMeta<M::PointerTag>,
    pointee: TyAndLayout<'tcx>
) -> InterpResult<'tcx>

fn check_safe_pointer(
    &mut self,
    value: &OpTy<'tcx, M::PointerTag>,
    kind: &str
) -> InterpResult<'tcx>

Check a reference or Box.

fn read_scalar(
    &self,
    op: &OpTy<'tcx, M::PointerTag>
) -> InterpResult<'tcx, ScalarMaybeUninit<M::PointerTag>>

fn try_visit_primitive(
    &mut self,
    value: &OpTy<'tcx, M::PointerTag>
) -> InterpResult<'tcx, bool>

Check if this is a value of primitive type, and if yes check the validity of the value at that type. Return true if the type is indeed primitive.

fn visit_scalar(
    &mut self,
    op: &OpTy<'tcx, M::PointerTag>,
    scalar_layout: &Scalar
) -> InterpResult<'tcx>

Trait Implementations

impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValueVisitor<'mir, 'tcx, M> for ValidityVisitor<'rt, 'mir, 'tcx, M>

type V = OpTy<'tcx, M::PointerTag>

fn ecx(&self) -> &InterpCx<'mir, 'tcx, M>

The visitor must have an InterpCx in it.

fn read_discriminant(
    &mut self,
    op: &OpTy<'tcx, M::PointerTag>
) -> InterpResult<'tcx, VariantIdx>

read_discriminant can be hooked for better error messages.

fn visit_field(
    &mut self,
    old_op: &OpTy<'tcx, M::PointerTag>,
    field: usize,
    new_op: &OpTy<'tcx, M::PointerTag>
) -> InterpResult<'tcx>

Called each time we recurse down to a field of a “product-like” aggregate (structs, tuples, arrays and the like, but not enums), passing in old (outer) and new (inner) value. This gives the visitor the chance to track the stack of nested fields that we are descending through.

fn visit_variant(
    &mut self,
    old_op: &OpTy<'tcx, M::PointerTag>,
    variant_id: VariantIdx,
    new_op: &OpTy<'tcx, M::PointerTag>
) -> InterpResult<'tcx>

Called when recursing into an enum variant. This gives the visitor the chance to track the stack of nested fields that we are descending through.

fn visit_union(
    &mut self,
    _op: &OpTy<'tcx, M::PointerTag>,
    _fields: NonZeroUsize
) -> InterpResult<'tcx>

Visits the given value as a union. No automatic recursion can happen here.

fn visit_value(&mut self, op: &OpTy<'tcx, M::PointerTag>) -> InterpResult<'tcx>

Visits the given value, dispatching as appropriate to more specialized visitors.

fn visit_aggregate(
    &mut self,
    op: &OpTy<'tcx, M::PointerTag>,
    fields: impl Iterator<Item = InterpResult<'tcx, Self::V>>
) -> InterpResult<'tcx>

Visits this value as an aggregate, you are getting an iterator yielding all the fields (still in an InterpResult, you have to do error handling yourself). Recurses into the fields.

fn walk_aggregate(
    &mut self,
    v: &Self::V,
    fields: impl Iterator<Item = InterpResult<'tcx, Self::V>>
) -> InterpResult<'tcx>

fn walk_value(&mut self, v: &Self::V) -> InterpResult<'tcx>