Trait rustc_type_ir::search_graph::Delegate

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pub trait Delegate {
    type Cx: Cx;
    type ValidationScope;
    type ProofTreeBuilder;

    const ENABLE_PROVISIONAL_CACHE: bool;
    const FIXPOINT_STEP_LIMIT: usize;
    const DIVIDE_AVAILABLE_DEPTH_ON_OVERFLOW: usize;

    // Required methods
    fn enter_validation_scope(
        cx: Self::Cx,
        input: <Self::Cx as Cx>::Input,
    ) -> Option<Self::ValidationScope>;
    fn inspect_is_noop(inspect: &mut Self::ProofTreeBuilder) -> bool;
    fn recursion_limit(cx: Self::Cx) -> usize;
    fn initial_provisional_result(
        cx: Self::Cx,
        kind: PathKind,
        input: <Self::Cx as Cx>::Input,
    ) -> <Self::Cx as Cx>::Result;
    fn is_initial_provisional_result(
        cx: Self::Cx,
        kind: PathKind,
        input: <Self::Cx as Cx>::Input,
        result: <Self::Cx as Cx>::Result,
    ) -> bool;
    fn on_stack_overflow(
        cx: Self::Cx,
        inspect: &mut Self::ProofTreeBuilder,
        input: <Self::Cx as Cx>::Input,
    ) -> <Self::Cx as Cx>::Result;
    fn on_fixpoint_overflow(
        cx: Self::Cx,
        input: <Self::Cx as Cx>::Input,
    ) -> <Self::Cx as Cx>::Result;
    fn is_ambiguous_result(result: <Self::Cx as Cx>::Result) -> bool;
    fn propagate_ambiguity(
        cx: Self::Cx,
        for_input: <Self::Cx as Cx>::Input,
        from_result: <Self::Cx as Cx>::Result,
    ) -> <Self::Cx as Cx>::Result;
    fn step_is_coinductive(cx: Self::Cx, input: <Self::Cx as Cx>::Input) -> bool;
}

Required Associated Types§

Required Associated Constants§

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const ENABLE_PROVISIONAL_CACHE: bool

Whether to use the provisional cache. Set to false by a fuzzer when validating the search graph.

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const FIXPOINT_STEP_LIMIT: usize

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const DIVIDE_AVAILABLE_DEPTH_ON_OVERFLOW: usize

Required Methods§

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fn enter_validation_scope( cx: Self::Cx, input: <Self::Cx as Cx>::Input, ) -> Option<Self::ValidationScope>

Returning Some disables the global cache for the current goal.

The ValidationScope is used when fuzzing the search graph to track for which goals the global cache has been disabled. This is necessary as we may otherwise ignore the global cache entry for some goal G only to later use it, failing to detect a cycle goal and potentially changing the result.

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fn inspect_is_noop(inspect: &mut Self::ProofTreeBuilder) -> bool

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fn recursion_limit(cx: Self::Cx) -> usize

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fn initial_provisional_result( cx: Self::Cx, kind: PathKind, input: <Self::Cx as Cx>::Input, ) -> <Self::Cx as Cx>::Result

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fn is_initial_provisional_result( cx: Self::Cx, kind: PathKind, input: <Self::Cx as Cx>::Input, result: <Self::Cx as Cx>::Result, ) -> bool

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fn on_stack_overflow( cx: Self::Cx, inspect: &mut Self::ProofTreeBuilder, input: <Self::Cx as Cx>::Input, ) -> <Self::Cx as Cx>::Result

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fn on_fixpoint_overflow( cx: Self::Cx, input: <Self::Cx as Cx>::Input, ) -> <Self::Cx as Cx>::Result

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fn is_ambiguous_result(result: <Self::Cx as Cx>::Result) -> bool

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fn propagate_ambiguity( cx: Self::Cx, for_input: <Self::Cx as Cx>::Input, from_result: <Self::Cx as Cx>::Result, ) -> <Self::Cx as Cx>::Result

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fn step_is_coinductive(cx: Self::Cx, input: <Self::Cx as Cx>::Input) -> bool

Object Safety§

This trait is not object safe.

Implementors§