[−][src]Trait rustc_mir::interpret::visitor::ValueVisitor

pub trait ValueVisitor<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>>: Sized {
    type V: Value<'mir, 'tcx, M>;
    pub fn ecx(&self) -> &InterpCx<'mir, 'tcx, M>;

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

    pub fn visit_value(&mut self, v: Self::V) -> InterpResult<'tcx> { ... }

    pub fn visit_union(
        &mut self, 
        _v: Self::V, 
        _fields: NonZeroUsize
    ) -> InterpResult<'tcx> { ... }

    pub fn visit_aggregate(
        &mut self, 
        v: Self::V, 
        fields: impl Iterator<Item = InterpResult<'tcx, Self::V>>
    ) -> InterpResult<'tcx> { ... }

    pub fn visit_field(
        &mut self, 
        _old_val: Self::V, 
        _field: usize, 
        new_val: Self::V
    ) -> InterpResult<'tcx> { ... }

    pub fn visit_variant(
        &mut self, 
        _old_val: Self::V, 
        _variant: VariantIdx, 
        new_val: Self::V
    ) -> InterpResult<'tcx> { ... }

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

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

Associated Types

type V: Value<'mir, 'tcx, M>[src]

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Required methods

pub fn ecx(&self) -> &InterpCx<'mir, 'tcx, M>[src]

The visitor must have an InterpCx in it.

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Provided methods

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

read_discriminant can be hooked for better error messages.

pub fn visit_value(&mut self, v: Self::V) -> InterpResult<'tcx>[src]

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

pub fn visit_union(
    &mut self,
    _v: Self::V,
    _fields: NonZeroUsize
) -> InterpResult<'tcx>[src]

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

pub fn visit_aggregate(
    &mut self,
    v: Self::V,
    fields: impl Iterator<Item = InterpResult<'tcx, Self::V>>
) -> InterpResult<'tcx>[src]

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.

pub fn visit_field(
    &mut self,
    _old_val: Self::V,
    _field: usize,
    new_val: Self::V
) -> InterpResult<'tcx>[src]

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.

pub fn visit_variant(
    &mut self,
    _old_val: Self::V,
    _variant: VariantIdx,
    new_val: Self::V
) -> InterpResult<'tcx>[src]

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.

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

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

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Implementors

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

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

impl<'rt, 'mir, 'tcx: 'mir, M: CompileTimeMachine<'mir, 'tcx>> ValueVisitor<'mir, 'tcx, M> for InternVisitor<'rt, 'mir, 'tcx, M>[src]

type V = MPlaceTy<'tcx>

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