Struct rustc_abi::TargetDataLayout

pub struct TargetDataLayout {

    pub endian: Endian,
    pub i1_align: AbiAndPrefAlign,
    pub i8_align: AbiAndPrefAlign,
    pub i16_align: AbiAndPrefAlign,
    pub i32_align: AbiAndPrefAlign,
    pub i64_align: AbiAndPrefAlign,
    pub i128_align: AbiAndPrefAlign,
    pub f32_align: AbiAndPrefAlign,
    pub f64_align: AbiAndPrefAlign,
    pub pointer_size: Size,
    pub pointer_align: AbiAndPrefAlign,
    pub aggregate_align: AbiAndPrefAlign,
    pub vector_align: Vec<(Size, AbiAndPrefAlign)>,
    pub instruction_address_space: AddressSpace,
    pub c_enum_min_size: Integer,
}

Parsed Data layout for a target, which contains everything needed to compute layouts.

Fields

endian: Endian

i1_align: AbiAndPrefAlign

i8_align: AbiAndPrefAlign

i16_align: AbiAndPrefAlign

i32_align: AbiAndPrefAlign

i64_align: AbiAndPrefAlign

i128_align: AbiAndPrefAlign

f32_align: AbiAndPrefAlign

f64_align: AbiAndPrefAlign

pointer_size: Size

pointer_align: AbiAndPrefAlign

aggregate_align: AbiAndPrefAlign

vector_align: Vec<(Size, AbiAndPrefAlign)>

Alignments for vector types.

instruction_address_space: AddressSpace

c_enum_min_size: Integer

Minimum size of #[repr(C)] enums (default c_int::BITS, usually 32) Note: This isn’t in LLVM’s data layout string, it is short_enum so the only valid spec for LLVM is c_int::BITS or 8

Implementations

impl TargetDataLayout

pub fn parse_from_llvm_datalayout_string<'a>( input: &'a str ) -> Result<TargetDataLayout, TargetDataLayoutErrors<'a>>

Parse data layout from an llvm data layout string

This function doesn’t fill c_enum_min_size and it will always be I32 since it can not be determined from llvm string.

pub fn obj_size_bound(&self) -> u64

Returns exclusive upper bound on object size.

The theoretical maximum object size is defined as the maximum positive isize value. This ensures that the offset semantics remain well-defined by allowing it to correctly index every address within an object along with one byte past the end, along with allowing isize to store the difference between any two pointers into an object.

The upper bound on 64-bit currently needs to be lower because LLVM uses a 64-bit integer to represent object size in bits. It would need to be 1 << 61 to account for this, but is currently conservatively bounded to 1 << 47 as that is enough to cover the current usable address space on 64-bit ARMv8 and x86_64.

pub fn ptr_sized_integer(&self) -> Integer

pub fn vector_align(&self, vec_size: Size) -> AbiAndPrefAlign

Trait Implementations

impl Debug for TargetDataLayout

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

Formats the value using the given formatter.

impl Default for TargetDataLayout

fn default() -> TargetDataLayout

Creates an instance of TargetDataLayout.

impl HasDataLayout for TargetDataLayout

fn data_layout(&self) -> &TargetDataLayout

impl PartialEq<TargetDataLayout> for TargetDataLayout

fn eq(&self, other: &TargetDataLayout) -> bool

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

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for TargetDataLayout

impl StructuralEq for TargetDataLayout

impl StructuralPartialEq for TargetDataLayout

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: 64 bytes