Struct rustc_middle::dep_graph::dep_node::DepKindStruct

pub struct DepKindStruct {
    pub(super) has_params: bool,
    pub(super) is_anon: bool,
    pub(super) is_eval_always: bool,
    can_reconstruct_query_key: fn() -> bool,
}

This struct stores metadata about each DepKind.

Information is retrieved by indexing the DEP_KINDS array using the integer value of the DepKind. Overall, this allows to implement DepContext using this manual jump table instead of large matches.

Fields

has_params: bool

Whether the DepNode has parameters (query keys).

is_anon: bool

Anonymous queries cannot be replayed from one compiler invocation to the next. When their result is needed, it is recomputed. They are useful for fine-grained dependency tracking, and caching within one compiler invocation.

is_eval_always: bool

Eval-always queries do not track their dependencies, and are always recomputed, even if their inputs have not changed since the last compiler invocation. The result is still cached within one compiler invocation.

can_reconstruct_query_key: fn() -> bool

Whether the query key can be recovered from the hashed fingerprint. See DepNodeParams trait for the behaviour of each key type.