Struct rustc_expand::hygiene::HygieneData

pub struct HygieneData {
    local_expn_data: IndexVec<LocalExpnId, Option<ExpnData>>,
    local_expn_hashes: IndexVec<LocalExpnId, ExpnHash>,
    foreign_expn_data: HashMap<ExpnId, ExpnData, BuildHasherDefault<FxHasher>>,
    foreign_expn_hashes: HashMap<ExpnId, ExpnHash, BuildHasherDefault<FxHasher>>,
    expn_hash_to_expn_id: HashMap<ExpnHash, ExpnId, BuildHasherDefault<Unhasher>>,
    syntax_context_data: Vec<SyntaxContextData, Global>,
    syntax_context_map: HashMap<(SyntaxContext, ExpnId, Transparency), SyntaxContext, BuildHasherDefault<FxHasher>>,
    expn_data_disambiguators: HashMap<u64, u32, BuildHasherDefault<FxHasher>>,
}

Fields

local_expn_data: IndexVec<LocalExpnId, Option<ExpnData>>

Each expansion should have an associated expansion data, but sometimes there’s a delay between creation of an expansion ID and obtaining its data (e.g. macros are collected first and then resolved later), so we use an Option here.

local_expn_hashes: IndexVec<LocalExpnId, ExpnHash>

foreign_expn_data: HashMap<ExpnId, ExpnData, BuildHasherDefault<FxHasher>>

Data and hash information from external crates. We may eventually want to remove these maps, and fetch the information directly from the other crate’s metadata like DefIds do.

foreign_expn_hashes: HashMap<ExpnId, ExpnHash, BuildHasherDefault<FxHasher>>

expn_hash_to_expn_id: HashMap<ExpnHash, ExpnId, BuildHasherDefault<Unhasher>>

syntax_context_data: Vec<SyntaxContextData, Global>

syntax_context_map: HashMap<(SyntaxContext, ExpnId, Transparency), SyntaxContext, BuildHasherDefault<FxHasher>>

expn_data_disambiguators: HashMap<u64, u32, BuildHasherDefault<FxHasher>>

Maps the local_hash of an ExpnData to the next disambiguator value. This is used by update_disambiguator to keep track of which ExpnDatas would have collisions without a disambiguator. The keys of this map are always computed with ExpnData.disambiguator set to 0.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 232 bytes