Module rustc_ap_rustc_span::def_id[−][src]

Structs

CrateId
DefId	A `DefId` identifies a particular definition, by combining a crate index and a def index.
DefIndex	A DefIndex is an index into the hir-map for a crate, identifying a particular definition. It should really be considered an interned shorthand for a particular DefPath.
DefPathHash	A `DefPathHash` is a fixed-size representation of a `DefPath` that is stable across crate and compilation session boundaries. It consists of two separate 64-bit hashes. The first uniquely identifies the crate this `DefPathHash` originates from (see StableCrateId), and the second uniquely identifies the corresponding `DefPath` within that crate. Together they form a unique identifier within an entire crate graph.
LocalDefId	A LocalDefId is equivalent to a DefId with `krate == LOCAL_CRATE`. Since we encode this information in the type, we can ensure at compile time that no DefIds from upstream crates get thrown into the mix. There are quite a few cases where we know that only DefIds from the local crate are expected and a DefId from a different crate would signify a bug somewhere. This is when LocalDefId comes in handy.
StableCrateId	A StableCrateId is a 64 bit hash of the crate name combined with all `-Cmetadata` arguments. It is to CrateNum what DefPathHash is to DefId. It is stable across compilation sessions.

CRATE_DEF_ID
CRATE_DEF_INDEX	The crate root is always assigned index 0 by the AST Map code, thanks to `NodeCollector::new`.
LOCAL_CRATE	Item definitions in the currently-compiled crate would have the `CrateNum` `LOCAL_CRATE` in their `DefId`.