Enum rustc::ty::layout::Layout [] [src]

pub enum Layout {
    Scalar {
        value: Primitive,
        non_zero: bool,
    },
    Vector {
        element: Primitive,
        count: u64,
    },
    Array {
        sized: bool,
        align: Align,
        primitive_align: Align,
        element_size: Size,
        count: u64,
    },
    FatPointer {
        metadata: Primitive,
        non_zero: bool,
    },
    CEnum {
        discr: Integer,
        signed: bool,
        non_zero: bool,
        min: u64,
        max: u64,
    },
    Univariant {
        variant: Struct,
        non_zero: bool,
    },
    UntaggedUnion {
        variants: Union,
    },
    General {
        discr: Integer,
        variants: Vec<Struct>,
        size: Size,
        align: Align,
        primitive_align: Align,
    },
    RawNullablePointer {
        nndiscr: u64,
        value: Primitive,
    },
    StructWrappedNullablePointer {
        nndiscr: u64,
        nonnull: Struct,
        discrfield: FieldPath,
        discrfield_source: FieldPath,
    },
}
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Type layout, from which size and alignment can be cheaply computed. For ADTs, it also includes field placement and enum optimizations. NOTE: Because Layout is interned, redundant information should be kept to a minimum, e.g. it includes no sub-component Ty or Layout.

Variants

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TyBool, TyChar, TyInt, TyUint, TyFloat, TyRawPtr, TyRef or TyFnPtr.

Fields of Scalar

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SIMD vectors, from structs marked with #[repr(simd)].

Fields of Vector

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TyArray, TySlice or TyStr.

Fields of Array

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If true, the size is exact, otherwise it's only a lower bound.

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TyRawPtr or TyRef with a !Sized pointee.

Fields of FatPointer

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If true, the pointer cannot be null.

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C-like enums; basically an integer.

Fields of CEnum

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Inclusive discriminant range. If min > max, it represents min...u64::MAX followed by 0...max.

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Single-case enums, and structs/tuples.

Fields of Univariant

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If true, the structure is NonZero.

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Untagged unions.

Fields of UntaggedUnion

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General-case enums: for each case there is a struct, and they all start with a field for the discriminant.

Fields of General

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Two cases distinguished by a nullable pointer: the case with discriminant nndiscr must have single field which is known to be nonnull due to its type. The other case is known to be zero sized. Hence we represent the enum as simply a nullable pointer: if not null it indicates the nndiscr variant, otherwise it indicates the other case.

For example, std::option::Option instantiated at a safe pointer type is represented such that None is a null pointer and Some is the identity function.

Fields of RawNullablePointer

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Two cases distinguished by a nullable pointer: the case with discriminant nndiscr is represented by the struct nonnull, where the discrfieldth field is known to be nonnull due to its type; if that field is null, then it represents the other case, which is known to be zero sized.

Fields of StructWrappedNullablePointer

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N.B. There is a 0 at the start, for LLVM GEP through a pointer.

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Like discrfield, but in source order. For debuginfo.

Methods

impl<'a, 'tcx> Layout
[src]

[src]

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[src]

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Returns true if the layout corresponds to an unsized type.

[src]

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[src]

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[src]

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Returns alignment before repr alignment is applied

[src]

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Returns repr alignment if it is greater than the primitive alignment.

[src]

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[src]

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This is invoked by the layout_raw query to record the final layout of each type.

Trait Implementations

impl Debug for Layout
[src]

[src]

Formats the value using the given formatter.

impl PartialEq for Layout
[src]

[src]

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

[src]

This method tests for !=.

impl Eq for Layout
[src]

impl Hash for Layout
[src]

[src]

Feeds this value into the given [Hasher]. Read more

1.3.0
[src]

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

impl<'gcx> HashStable<StableHashingContext<'gcx>> for Layout
[src]

[src]

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