Struct rustc::hir::lowering::LoweringContext[][src]

pub struct LoweringContext<'a> {
    crate_root: Option<&'static str>,
    sess: &'a Session,
    cstore: &'a CrateStore,
    resolver: &'a mut Resolver,
    items: BTreeMap<NodeId, Item>,
    trait_items: BTreeMap<TraitItemId, TraitItem>,
    impl_items: BTreeMap<ImplItemId, ImplItem>,
    bodies: BTreeMap<BodyId, Body>,
    exported_macros: Vec<MacroDef>,
    trait_impls: BTreeMap<DefId, Vec<NodeId>>,
    trait_auto_impl: BTreeMap<DefId, NodeId>,
    is_generator: bool,
    catch_scopes: Vec<NodeId>,
    loop_scopes: Vec<NodeId>,
    is_in_loop_condition: bool,
    is_in_trait_impl: bool,
    anonymous_lifetime_mode: AnonymousLifetimeMode,
    lifetimes_to_define: Vec<(Span, ParamName)>,
    is_collecting_in_band_lifetimes: bool,
    in_scope_lifetimes: Vec<Ident>,
    type_def_lifetime_params: DefIdMap<usize>,
    current_hir_id_owner: Vec<(DefIndex, u32)>,
    item_local_id_counters: NodeMap<u32>,
    node_id_to_hir_id: IndexVec<NodeId, HirId>,
}
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Fields

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The items being lowered are collected here.

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What to do when we encounter either an "anonymous lifetime reference". The term "anonymous" is meant to encompass both '_ lifetimes as well as fully elided cases where nothing is written at all (e.g., &T or std::cell::Ref<T>).

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Methods

impl<'a> LoweringContext<'a>
[src]

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This method allocates a new HirId for the given NodeId and stores it in the LoweringContext's NodeId => HirId map. Take care not to call this method if the resulting HirId is then not actually used in the HIR, as that would trigger an assertion in the HirIdValidator later on, which makes sure that all NodeIds got mapped properly. Calling the method twice with the same NodeId is fine though.

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Creates a new hir::GenericParam for every new lifetime and type parameter encountered while evaluating f. Definitions are created with the parent provided. If no parent_id is provided, no definitions will be returned.

Presuming that in-band lifetimes are enabled, then self.anonymous_lifetime_mode will be updated to match the argument while f is running (and restored afterwards).

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When there is a reference to some lifetime 'a, and in-band lifetimes are enabled, then we want to push that lifetime into the vector of names to define later. In that case, it will get added to the appropriate generics.

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When we have either an elided or '_ lifetime in an impl header, we convert it to

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Appends in-band lifetime defs and argument-position impl Trait defs to the existing set of generics.

Presuming that in-band lifetimes are enabled, then self.anonymous_lifetime_mode will be updated to match the argument while f is running (and restored afterwards).

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Lowers impl Trait items and appends them to the list

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If an explicit_owner is given, this method allocates the HirId in the address space of that item instead of the item currently being lowered. This can happen during lower_impl_item_ref() where we need to lower a Visibility value although we haven't lowered the owning ImplItem in question yet.

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this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Given suffix ["b","c","d"], returns path ::std::b::c::d when fld.cx.use_std, and ::core::b::c::d otherwise. The path is also resolved according to is_value.

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Invoked to create the lifetime argument for a type &T with no explicit lifetime.

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Invoked to create the lifetime argument(s) for a path like std::cell::Ref<T>; note that implicit lifetimes in these sorts of cases are deprecated. This may therefore report a warning or an error, depending on the mode.

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Invoked to create the lifetime argument(s) for an elided trait object bound, like the bound in Box<dyn Debug>. This method is not invoked when the bound is written, even if it is written with '_ like in Box<dyn Debug + '_>. In those cases, lower_lifetime is invoked.

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Auto Trait Implementations

impl<'a> !Send for LoweringContext<'a>

impl<'a> !Sync for LoweringContext<'a>