[][src]Trait rustc_query_system::dep_graph::dep_node::DepNodeParams

pub trait DepNodeParams<Ctxt: DepContext>: Debug + Sized {
    fn can_reconstruct_query_key() -> bool;
fn recover(tcx: Ctxt, dep_node: &DepNode<Ctxt::DepKind>) -> Option<Self>; fn to_fingerprint(&self, _: Ctxt) -> Fingerprint { ... }
fn to_debug_str(&self, _: Ctxt) -> String { ... } }

Required methods

fn can_reconstruct_query_key() -> bool

fn recover(tcx: Ctxt, dep_node: &DepNode<Ctxt::DepKind>) -> Option<Self>

This method tries to recover the query key from the given DepNode, something which is needed when forcing DepNodes during red-green evaluation. The query system will only call this method if can_reconstruct_query_key() is true. It is always valid to return None here, in which case incremental compilation will treat the query as having changed instead of forcing it.

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Provided methods

fn to_fingerprint(&self, _: Ctxt) -> Fingerprint

This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don't need to if the corresponding DepNode is anonymous).

fn to_debug_str(&self, _: Ctxt) -> String

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Implementations on Foreign Types

impl<Ctxt: DepContext> DepNodeParams<Ctxt> for ()[src]

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impl<Ctxt: DepContext, T> DepNodeParams<Ctxt> for T where
    T: HashStable<Ctxt::StableHashingContext> + Debug

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