Enum rustc_middle::thir::ExprKind

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pub enum ExprKind<'tcx> {
Show 46 variants Scope { region_scope: Scope, lint_level: LintLevel, value: ExprId, }, Box { value: ExprId, }, If { if_then_scope: Scope, cond: ExprId, then: ExprId, else_opt: Option<ExprId>, }, Call { ty: Ty<'tcx>, fun: ExprId, args: Box<[ExprId]>, from_hir_call: bool, fn_span: Span, }, Deref { arg: ExprId, }, Binary { op: BinOp, lhs: ExprId, rhs: ExprId, }, LogicalOp { op: LogicalOp, lhs: ExprId, rhs: ExprId, }, Unary { op: UnOp, arg: ExprId, }, Cast { source: ExprId, }, Use { source: ExprId, }, NeverToAny { source: ExprId, }, PointerCoercion { cast: PointerCoercion, source: ExprId, }, Loop { body: ExprId, }, Let { expr: ExprId, pat: Box<Pat<'tcx>>, }, Match { scrutinee: ExprId, scrutinee_hir_id: HirId, arms: Box<[ArmId]>, match_source: MatchSource, }, Block { block: BlockId, }, Assign { lhs: ExprId, rhs: ExprId, }, AssignOp { op: BinOp, lhs: ExprId, rhs: ExprId, }, Field { lhs: ExprId, variant_index: VariantIdx, name: FieldIdx, }, Index { lhs: ExprId, index: ExprId, }, VarRef { id: LocalVarId, }, UpvarRef { closure_def_id: DefId, var_hir_id: LocalVarId, }, Borrow { borrow_kind: BorrowKind, arg: ExprId, }, AddressOf { mutability: Mutability, arg: ExprId, }, Break { label: Scope, value: Option<ExprId>, }, Continue { label: Scope, }, Return { value: Option<ExprId>, }, Become { value: ExprId, }, ConstBlock { did: DefId, args: GenericArgsRef<'tcx>, }, Repeat { value: ExprId, count: Const<'tcx>, }, Array { fields: Box<[ExprId]>, }, Tuple { fields: Box<[ExprId]>, }, Adt(Box<AdtExpr<'tcx>>), PlaceTypeAscription { source: ExprId, user_ty: Option<Box<CanonicalUserType<'tcx>>>, }, ValueTypeAscription { source: ExprId, user_ty: Option<Box<CanonicalUserType<'tcx>>>, }, Closure(Box<ClosureExpr<'tcx>>), Literal { lit: &'tcx Lit, neg: bool, }, NonHirLiteral { lit: ScalarInt, user_ty: Option<Box<CanonicalUserType<'tcx>>>, }, ZstLiteral { user_ty: Option<Box<CanonicalUserType<'tcx>>>, }, NamedConst { def_id: DefId, args: GenericArgsRef<'tcx>, user_ty: Option<Box<CanonicalUserType<'tcx>>>, }, ConstParam { param: ParamConst, def_id: DefId, }, StaticRef { alloc_id: AllocId, ty: Ty<'tcx>, def_id: DefId, }, InlineAsm(Box<InlineAsmExpr<'tcx>>), OffsetOf { container: Ty<'tcx>, fields: &'tcx List<(VariantIdx, FieldIdx)>, }, ThreadLocalRef(DefId), Yield { value: ExprId, },
}

Variants§

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Scope

Scopes are used to explicitly mark destruction scopes, and to track the HirId of the expressions within the scope.

Fields

§region_scope: Scope
§lint_level: LintLevel
§value: ExprId
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Box

A box <value> expression.

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§value: ExprId
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If

An if expression.

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§if_then_scope: Scope
§cond: ExprId
§then: ExprId
§else_opt: Option<ExprId>
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Call

A function call. Method calls and overloaded operators are converted to plain function calls.

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§ty: Ty<'tcx>

The type of the function. This is often a FnDef or a FnPtr.

§fun: ExprId

The function itself.

§args: Box<[ExprId]>

The arguments passed to the function.

Note: in some cases (like calling a closure), the function call f(...args) gets rewritten as a call to a function trait method (e.g. FnOnce::call_once(f, (...args))).

§from_hir_call: bool

Whether this is from an overloaded operator rather than a function call from HIR. true for overloaded function call.

§fn_span: Span

The span of the function, without the dot and receiver (e.g. foo(a, b) in x.foo(a, b)).

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Deref

A non-overloaded dereference.

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Binary

A non-overloaded binary operation.

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LogicalOp

A logical operation. This is distinct from BinaryOp because the operands need to be lazily evaluated.

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Unary

A non-overloaded unary operation. Note that here the deref (*) operator is represented by ExprKind::Deref.

Fields

§op: UnOp
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Cast

A cast: <source> as <type>. The type we cast to is the type of the parent expression.

Fields

§source: ExprId
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Use

Forces its contents to be treated as a value expression, not a place expression. This is inserted in some places where an operation would otherwise be erased completely (e.g. some no-op casts), but we still need to ensure that its operand is treated as a value and not a place.

Fields

§source: ExprId
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NeverToAny

A coercion from ! to any type.

Fields

§source: ExprId
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PointerCoercion

A pointer coercion. More information can be found in PointerCoercion. Pointer casts that cannot be done by coercions are represented by ExprKind::Cast.

Fields

§source: ExprId
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Loop

A loop expression.

Fields

§body: ExprId
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Let

Special expression representing the let part of an if let or similar construct (including if let guards in match arms, and let-chains formed by &&).

This isn’t considered a real expression in surface Rust syntax, so it can only appear in specific situations, such as within the condition of an if.

(Not to be confused with StmtKind::Let, which is a normal let statement.)

Fields

§expr: ExprId
§pat: Box<Pat<'tcx>>
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Match

A match expression.

Fields

§scrutinee: ExprId
§scrutinee_hir_id: HirId
§arms: Box<[ArmId]>
§match_source: MatchSource
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Block

A block.

Fields

§block: BlockId
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Assign

An assignment: lhs = rhs.

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AssignOp

A non-overloaded operation assignment, e.g. lhs += rhs.

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Field

Access to a field of a struct, a tuple, an union, or an enum.

Fields

§variant_index: VariantIdx

Variant containing the field.

§name: FieldIdx

This can be a named (.foo) or unnamed (.0) field.

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Index

A non-overloaded indexing operation.

Fields

§index: ExprId
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VarRef

A local variable.

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UpvarRef

Used to represent upvars mentioned in a closure/coroutine

Fields

§closure_def_id: DefId

DefId of the closure/coroutine

§var_hir_id: LocalVarId

HirId of the root variable

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Borrow

A borrow, e.g. &arg.

Fields

§borrow_kind: BorrowKind
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AddressOf

A &raw [const|mut] $place_expr raw borrow resulting in type *[const|mut] T.

Fields

§mutability: Mutability
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Break

A break expression.

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§label: Scope
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Continue

A continue expression.

Fields

§label: Scope
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Return

A return expression.

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Become

A become expression.

Fields

§value: ExprId
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ConstBlock

An inline const block, e.g. const {}.

Fields

§did: DefId
§args: GenericArgsRef<'tcx>
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Repeat

An array literal constructed from one repeated element, e.g. [1; 5].

Fields

§value: ExprId
§count: Const<'tcx>
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Array

An array, e.g. [a, b, c, d].

Fields

§fields: Box<[ExprId]>
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Tuple

A tuple, e.g. (a, b, c, d).

Fields

§fields: Box<[ExprId]>
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Adt(Box<AdtExpr<'tcx>>)

An ADT constructor, e.g. Foo {x: 1, y: 2}.

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PlaceTypeAscription

A type ascription on a place.

Fields

§source: ExprId
§user_ty: Option<Box<CanonicalUserType<'tcx>>>

Type that the user gave to this expression

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ValueTypeAscription

A type ascription on a value, e.g. 42: i32.

Fields

§source: ExprId
§user_ty: Option<Box<CanonicalUserType<'tcx>>>

Type that the user gave to this expression

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Closure(Box<ClosureExpr<'tcx>>)

A closure definition.

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Literal

A literal.

Fields

§lit: &'tcx Lit
§neg: bool
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NonHirLiteral

For literals that don’t correspond to anything in the HIR

Fields

§user_ty: Option<Box<CanonicalUserType<'tcx>>>
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ZstLiteral

A literal of a ZST type.

Fields

§user_ty: Option<Box<CanonicalUserType<'tcx>>>
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NamedConst

Associated constants and named constants

Fields

§def_id: DefId
§args: GenericArgsRef<'tcx>
§user_ty: Option<Box<CanonicalUserType<'tcx>>>
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ConstParam

Fields

§def_id: DefId
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StaticRef

A literal containing the address of a static.

This is only distinguished from Literal so that we can register some info for diagnostics.

Fields

§alloc_id: AllocId
§ty: Ty<'tcx>
§def_id: DefId
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InlineAsm(Box<InlineAsmExpr<'tcx>>)

Inline assembly, i.e. asm!().

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OffsetOf

Field offset (offset_of!)

Fields

§container: Ty<'tcx>
§fields: &'tcx List<(VariantIdx, FieldIdx)>
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ThreadLocalRef(DefId)

An expression taking a reference to a thread local.

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Yield

A yield expression.

Fields

§value: ExprId

Trait Implementations§

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impl<'tcx> Clone for ExprKind<'tcx>

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fn clone(&self) -> ExprKind<'tcx>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'tcx> Debug for ExprKind<'tcx>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for ExprKind<'tcx>

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fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher )

Auto Trait Implementations§

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impl<'tcx> DynSend for ExprKind<'tcx>

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impl<'tcx> DynSync for ExprKind<'tcx>

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impl<'tcx> Freeze for ExprKind<'tcx>

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impl<'tcx> !RefUnwindSafe for ExprKind<'tcx>

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impl<'tcx> Send for ExprKind<'tcx>

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impl<'tcx> Sync for ExprKind<'tcx>

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impl<'tcx> Unpin for ExprKind<'tcx>

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impl<'tcx> !UnwindSafe for ExprKind<'tcx>

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<Tcx, T> DepNodeParams<Tcx> for T
where Tcx: DepContext, T: for<'a> HashStable<StableHashingContext<'a>> + Debug,

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default fn fingerprint_style() -> FingerprintStyle

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default fn to_fingerprint(&self, tcx: Tcx) -> Fingerprint

This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous).
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default fn to_debug_str(&self, _: Tcx) -> String

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default fn recover(_: Tcx, _: &DepNode) -> Option<T>

This method tries to recover the query key from the given DepNode, something which is needed when forcing DepNodes during red-green evaluation. The query system will only call this method if fingerprint_style() is not FingerprintStyle::Opaque. It is always valid to return None here, in which case incremental compilation will treat the query as having changed instead of forcing it.
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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<P> IntoQueryParam<P> for P

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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<'tcx, T> ToPredicate<'tcx, T> for T

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fn to_predicate(self, _tcx: TyCtxt<'tcx>) -> T

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed ) -> T

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T
where T: Send + Sync,

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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: 40 bytes

Size for each variant:

  • Scope: 23 bytes
  • Box: 7 bytes
  • If: 23 bytes
  • Call: 39 bytes
  • Deref: 7 bytes
  • Binary: 11 bytes
  • LogicalOp: 11 bytes
  • Unary: 7 bytes
  • Cast: 7 bytes
  • Use: 7 bytes
  • NeverToAny: 7 bytes
  • PointerCoercion: 7 bytes
  • Loop: 7 bytes
  • Let: 15 bytes
  • Match: 39 bytes
  • Block: 7 bytes
  • Assign: 11 bytes
  • AssignOp: 11 bytes
  • Field: 15 bytes
  • Index: 11 bytes
  • VarRef: 11 bytes
  • UpvarRef: 19 bytes
  • Borrow: 7 bytes
  • AddressOf: 7 bytes
  • Break: 15 bytes
  • Continue: 11 bytes
  • Return: 7 bytes
  • Become: 7 bytes
  • ConstBlock: 23 bytes
  • Repeat: 15 bytes
  • Array: 23 bytes
  • Tuple: 23 bytes
  • Adt: 15 bytes
  • PlaceTypeAscription: 15 bytes
  • ValueTypeAscription: 15 bytes
  • Closure: 15 bytes
  • Literal: 15 bytes
  • NonHirLiteral: 31 bytes
  • ZstLiteral: 15 bytes
  • NamedConst: 31 bytes
  • ConstParam: 19 bytes
  • StaticRef: 31 bytes
  • InlineAsm: 15 bytes
  • OffsetOf: 23 bytes
  • ThreadLocalRef: 11 bytes
  • Yield: 7 bytes