Enum rustc_middle::mir::StatementKind[][src]

pub enum StatementKind<'tcx> {
    Assign(Box<(Place<'tcx>, Rvalue<'tcx>)>),
    FakeRead(Box<(FakeReadCause, Place<'tcx>)>),
    SetDiscriminant {
        place: Box<Place<'tcx>>,
        variant_index: VariantIdx,
    },
    StorageLive(Local),
    StorageDead(Local),
    LlvmInlineAsm(Box<LlvmInlineAsm<'tcx>>),
    Retag(RetagKindBox<Place<'tcx>>),
    AscribeUserType(Box<(Place<'tcx>, UserTypeProjection)>, Variance),
    Coverage(Box<Coverage>),
    CopyNonOverlapping(Box<CopyNonOverlapping<'tcx>>),
    Nop,
}

Variants

Assign(Box<(Place<'tcx>, Rvalue<'tcx>)>)

Write the RHS Rvalue to the LHS Place.

Tuple Fields of Assign

0: Box<(Place<'tcx>, Rvalue<'tcx>)>
FakeRead(Box<(FakeReadCause, Place<'tcx>)>)

This represents all the reading that a pattern match may do (e.g., inspecting constants and discriminant values), and the kind of pattern it comes from. This is in order to adapt potential error messages to these specific patterns.

Note that this also is emitted for regular let bindings to ensure that locals that are never accessed still get some sanity checks for, e.g., let x: ! = ..;

Tuple Fields of FakeRead

0: Box<(FakeReadCause, Place<'tcx>)>
SetDiscriminant

Write the discriminant for a variant to the enum Place.

Fields of SetDiscriminant

place: Box<Place<'tcx>>variant_index: VariantIdx
StorageLive(Local)

Start a live range for the storage of the local.

Tuple Fields of StorageLive

0: Local
StorageDead(Local)

End the current live range for the storage of the local.

Tuple Fields of StorageDead

0: Local
LlvmInlineAsm(Box<LlvmInlineAsm<'tcx>>)

Executes a piece of inline Assembly. Stored in a Box to keep the size of StatementKind low.

Tuple Fields of LlvmInlineAsm

0: Box<LlvmInlineAsm<'tcx>>
Retag(RetagKindBox<Place<'tcx>>)

Retag references in the given place, ensuring they got fresh tags. This is part of the Stacked Borrows model. These statements are currently only interpreted by miri and only generated when “-Z mir-emit-retag” is passed. See https://internals.rust-lang.org/t/stacked-borrows-an-aliasing-model-for-rust/8153/ for more details.

Tuple Fields of Retag

0: RetagKind1: Box<Place<'tcx>>
AscribeUserType(Box<(Place<'tcx>, UserTypeProjection)>, Variance)

Encodes a user’s type ascription. These need to be preserved intact so that NLL can respect them. For example:

let a: T = y;

The effect of this annotation is to relate the type T_y of the place y to the user-given type T. The effect depends on the specified variance:

Tuple Fields of AscribeUserType

0: Box<(Place<'tcx>, UserTypeProjection)>1: Variance
Coverage(Box<Coverage>)

Marks the start of a “coverage region”, injected with ‘-Zinstrument-coverage’. A Coverage statement carries metadata about the coverage region, used to inject a coverage map into the binary. If Coverage::kind is a Counter, the statement also generates executable code, to increment a counter variable at runtime, each time the code region is executed.

Tuple Fields of Coverage

0: Box<Coverage>
CopyNonOverlapping(Box<CopyNonOverlapping<'tcx>>)

Denotes a call to the intrinsic function copy_overlapping, where src_dst denotes the memory being read from and written to(one field to save memory), and size indicates how many bytes are being copied over.

Tuple Fields of CopyNonOverlapping

0: Box<CopyNonOverlapping<'tcx>>
Nop

No-op. Useful for deleting instructions without affecting statement indices.

Implementations

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Feeds this value into the given Hasher. Read more

Feeds a slice of this type into the given Hasher. Read more

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

Returns true if self has any late-bound regions that are either bound by binder or bound by some binder outside of binder. If binder is ty::INNERMOST, this indicates whether there are any late-bound regions that appear free. Read more

Returns true if this self has any regions that escape binder (and hence are not bound by it). Read more

“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound. Read more

True if there are any un-erased free regions.

Indicates whether this value definitely references only ‘global’ generic parameters that are the same regardless of what fn we are in. This is used for caching. Read more

Indicates whether this value references only ‘global’ generic parameters that are the same regardless of what fn we are in. This is used for caching. Read more

True if there are any late-bound regions

Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

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

recently added

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

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

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: 16 bytes

Size for each variant: