Expand description
HIR datatypes. See the rustc dev guide for more info.
Re-exports
Modules
arena 🔒
For each definition, we track the following data. A definition
here is defined somewhat circularly as “something with a
DefId”,
but it generally corresponds to things like structs, enums, etc.
There are also some rather random cases (like const initializer
expressions) that are mostly just leftovers.hir 🔒
HIR walker for walking the contents of nodes.
Defines language items.
target 🔒
This module implements some validity checks for attributes.
In particular it verifies that
#[inline] and #[repr] attributes are
attached to items that actually support them and if there are
conflicts between multiple such attributes attached to the same
item.Validity checking for weak lang items
Macros
This higher-order macro declares a list of types which can be allocated by
Arena.Structs
A constant (expression) that’s not an item or associated item,
but needs its own
DefId for type-checking, const-eval, etc.
These are usually found nested inside types (e.g., array lengths)
or expressions (e.g., repeat counts), and also used to define
explicit discriminant values for enum variants.Represents a single arm of a
match expression, e.g.
<pat> (if <guard>) => <body>.Attributes owned by a HIR owner.
Explicit binding annotations given in the HIR for a binding. Note
that this is not the final binding mode that we infer after type
inference.
A block of statements
{ .. }, which may have a label (in this case the
targeted_by_break field will be true) and may be unsafe by means of
the rules being anything but DefaultBlock.The body of a function, closure, or constant value. In the case of
a function, the body contains not only the function body itself
(which is an expression), but also the argument patterns, since
those are something that the caller doesn’t really care about.
The top-level data structure that stores the entire contents of
the crate currently being compiled.
An expression.
Represents the header (not the body) of a function declaration.
Represents a function’s signature in a trait declaration,
trait implementation, or a free function.
A reference from a foreign block to one of its items. This
contains the item’s ID, naturally, but also the item’s name and
some other high-level details (like whether it is an associated
type or method, and whether it is public). This allows other
passes to find the impl they want without loading the ID (which
means fewer edges in the incremental compilation graph).
Represents lifetimes and type parameters attached to a declaration
of a function, enum, trait, etc.
Represents anything within an
impl block.A reference from an impl to one of its associated items. This
contains the item’s ID, naturally, but also the item’s name and
some other high-level details (like whether it is an associated
type or method, and whether it is public). This allows other
passes to find the impl they want without loading the ID (which
means fewer edges in the incremental compilation graph).
An item
Represents a
let <pat>[: <ty>] = <expr> expression (not a Local), occurring in an if-let or
let-else, evaluating to a boolean. Typically the pattern is refutable.Represents a
let statement (i.e., let <pat>:<ty> = <init>;).Full information resulting from lowering an AST node.
Map of all HIR nodes inside the current owner.
These nodes are mapped by
ItemLocalId alongside the index of their parent node.
The HIR tree, including bodies, is pre-hashed.Represents a parameter in a function header.
HIR node coupled with its parent’s id in the same HIR owner.
A single field in a struct pattern.
A
Path is essentially Rust’s notion of a name; for instance,
std::cmp::PartialEq. It’s represented as a sequence of identifiers,
along with a bunch of supporting information.A segment of a path: an identifier, an optional lifetime, and a set of
types.
A statement.
Represents an item declaration within a trait declaration,
possibly including a default implementation. A trait item is
either required (meaning it doesn’t have an implementation, just a
signature) or provided (meaning it has a default implementation).
A reference from an trait to one of its associated items. This
contains the item’s id, naturally, but also the item’s name and
some other high-level details (like whether it is an associated
type or method, and whether it is public). This allows other
passes to find the impl they want without loading the ID (which
means fewer edges in the incremental compilation graph).
References to traits in impls.
Bind a type to an associated type (i.e.,
A = Foo).A variable captured by a closure.
A type bound (e.g.,
for<'c> Foo: Send + Clone + 'c).An equality predicate (e.g.,
T = int); currently unsupported.A lifetime predicate (e.g.,
'a: 'b + 'c).Enums
In the case of a generator created as part of an async construct,
which kind of async construct caused it to be created?
The kind of borrow in an
AddrOf expression,
e.g., &place or &raw const place.A capture clause used in closures and
async blocks.Represents
for<...> binder before a closureThe kind of an item that requires const-checking.
An item within an
extern block.The type of source expression that caused this generator to be created.
The AST represents all type param bounds as types.
typeck::collect::compute_bounds matches these against
the “special” built-in traits (see middle::lang_items) and
detects Copy, Send and Sync.Represents various kinds of content within an
impl.Represents what type of implicit self a function has, if any.
Is the trait definition an auto trait?
Hints at the original code for a let statement.
The loop type that yielded an
ExprKind::Loop.Hints at the original code for a
match _ { .. }.The movability of a generator / closure literal:
whether a generator contains self-references, causing it to be
!Unpin.From whence the opaque type came.
Not represented directly in the AST; referred to by name through a
ty_path.Represents an optionally
Self-qualified value/type path or associated extension.The contents of a statement.
A modifier on a bound, currently this is only used for
?Sized, where the
modifier is Maybe. Negative bounds should also be handled here.Represents a trait method’s body (or just argument names).
Represents a trait method or associated constant or type
The various kinds of types recognized by the compiler.
Fields and constructor IDs of enum variants and structs.
A single predicate in a where-clause.
The yield kind that caused an
ExprKind::Yield.Constants
The name of the associated type for
Fn return types.Traits
Requirements for a
StableHashingContext to be used in this crate.
This is a hack to allow using the HashStable_Generic derive macro
instead of implementing everything in rustc_middle.Functions
Checks if the specified expression is a built-in range literal.
(See:
LoweringContext::lower_expr()).