[][src]Struct rustc::hir::map::Map

pub struct Map<'hir> {
    pub forest: &'hir Forest,
    pub dep_graph: DepGraph,
    pub crate_hash: Svh,
    map: Vec<Option<Entry<'hir>>>,
    definitions: &'hir Definitions,
    hir_to_node_id: FxHashMap<HirId, NodeId>,
}
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Represents a mapping from Node IDs to AST elements and their parent Node IDs

Fields

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The backing storage for all the AST nodes.

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Same as the dep_graph in forest, just available with one fewer deref. This is a gratuitous micro-optimization.

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The SVH of the local crate.

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NodeIds are sequential integers from 0, so we can be super-compact by storing them in a vector. Not everything with a NodeId is in the map, but empirically the occupancy is about 75-80%, so there's not too much overhead (certainly less than a hashmap, since they (at the time of writing) have a maximum of 75% occupancy).

Also, indexing is pretty quick when you've got a vector and plain old integers.

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The reverse mapping of node_to_hir_id.

Methods

impl<'hir> Map<'hir>
[src]

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Registers a read in the dependency graph of the AST node with the given id. This needs to be called each time a public function returns the HIR for a node -- in other words, when it "reveals" the content of a node to the caller (who might not otherwise have had access to those contents, and hence needs a read recorded). If the function just returns a DefId or NodeId, no actual content was returned, so no read is needed.

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Returns the NodeId that corresponds to the definition of which this is the body of, i.e. a fn, const or static item (possibly associated), a closure, or a hir::AnonConst.

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Given a node id, returns the BodyId associated with it, if the node is a body owner, otherwise returns None.

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Given a body owner's id, returns the BodyId associated with it.

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Important traits for &'a [u8]

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Important traits for &'a [u8]

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Get the attributes on the krate. This is preferable to invoking krate.attrs because it registers a tighter dep-graph access.

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Retrieve the Node corresponding to id, panicking if it cannot be found.

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Retrieve the Node corresponding to id, returning None if cannot be found.

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Similar to get_parent, returns the parent node id or id if there is no parent. Note that the parent may be CRATE_NODE_ID, which is not itself present in the map -- so passing the return value of get_parent_node to get may actually panic. This function returns the immediate parent in the AST, whereas get_parent returns the enclosing item. Note that this might not be the actual parent node in the AST - some kinds of nodes are not in the map and these will never appear as the parent_node. So you can always walk the parent_nodes from a node to the root of the ast (unless you get the same id back here that can happen if the id is not in the map itself or is just weird).

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Check if the node is an argument. An argument is a local variable whose immediate parent is an item or a closure.

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If there is some error when walking the parents (e.g., a node does not have a parent in the map or a node can't be found), then we return the last good node id we found. Note that reaching the crate root (id == 0), is not an error, since items in the crate module have the crate root as parent.

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Retrieve the NodeId for id's enclosing method, unless there's a while or loop before reaching it, as block tail returns are not available in them.

fn foo(x: usize) -> bool {
    if x == 1 {
        true  // `get_return_block` gets passed the `id` corresponding
    } else {  // to this, it will return `foo`'s `NodeId`.
        false
    }
}
fn foo(x: usize) -> bool {
    loop {
        true  // `get_return_block` gets passed the `id` corresponding
    }         // to this, it will return `None`.
    false
}

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Retrieve the NodeId for id's parent item, or id itself if no parent item is in this map. The "parent item" is the closest parent node in the HIR which is recorded by the map and is an item, either an item in a module, trait, or impl.

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Returns the NodeId of id's nearest module parent, or id itself if no module parent is in this map.

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Returns the nearest enclosing scope. A scope is an item or block. FIXME it is not clear to me that all items qualify as scopes - statics and associated types probably shouldn't, for example. Behavior in this regard should be expected to be highly unstable.

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Returns the name associated with the given NodeId's AST.

Important traits for &'a [u8]

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Given a node ID, get a list of attributes associated with the AST corresponding to the Node ID

Important traits for NodesMatchingSuffix<'a, 'hir>

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Returns an iterator that yields the node id's with paths that match parts. (Requires parts is non-empty.)

For example, if given parts equal to ["bar", "quux"], then the iterator will produce node id's for items with paths such as foo::bar::quux, bar::quux, other::bar::quux, and any other such items it can find in the map.

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Trait Implementations

impl<'hir> Clone for Map<'hir>
[src]

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl<'hir> PpAnn for Map<'hir>
[src]

Identical to the PpAnn implementation for hir::Crate, except it avoids creating a dependency on the whole crate.

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Auto Trait Implementations

impl<'hir> !Send for Map<'hir>

impl<'hir> !Sync for Map<'hir>

Blanket Implementations

impl<T> MaybeResult for T
[src]

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impl<'a, T> Captures for T where
    T: ?Sized
[src]

impl<T> ToOwned for T where
    T: Clone
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Creates owned data from borrowed data, usually by cloning. Read more

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recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T> From for T
[src]

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
[src]

Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
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The type returned in the event of a conversion error.

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Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
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Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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The type returned in the event of a conversion error.

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Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
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Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
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this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<E> SpecializationError for E
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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

impl<T> Erased for T
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impl<T> Send for T where
    T: ?Sized
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impl<T> Sync for T where
    T: ?Sized
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impl<T> Erased for T