Struct DataLayout 

pub struct DataLayout {
    pub little_endian: bool,
    pub pointer_bits: u32,
    pub pointer_align: u32,
    pub i64_align: u32,
    pub f80_align: Option<u32>,
    pub stack_align: u32,
}

The layout facts a printed module carries so it can be compiled without the command line that produced it.

A subset of the string LLVM writes, in the same syntax, because that syntax is what tools around the ecosystem already read. It says what the module was built assuming, and the verifier is what checks it against the target actually being compiled for: a module built for a 64-bit pointer cannot be finished for a 32-bit one, and finding that out here is better than finding it out as wrong output.

Fields

little_endian: bool

Whether the low byte of a scalar is stored first.

pointer_bits: u32

The width of a pointer in bits.

pointer_align: u32

The alignment of a pointer in bits.

i64_align: u32

The alignment of a 64-bit integer in bits, which is the one integer alignment that varies across the targets anybody still builds for.

f80_align: Option<u32>

The alignment of the x87 eighty bit format in bits, and None on a target that does not have it.

stack_align: u32

The alignment the stack is kept at in bits, which is 128 on every target here.

Implementations

impl DataLayout

pub fn for_target(target: &TargetInfo) -> Self

The layout of that target.

pub fn parse(text: &str) -> Option<Self>

The layout back from the string Display wrote, or None if the string is not one.

The fields may come in any order, because a string written by hand will not have them in ours. A string this crate printed round-trips byte for byte, which is what spec/03-architecture.md asks of the textual form.

Trait Implementations

impl Clone for DataLayout

fn clone(&self) -> DataLayout

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for DataLayout

impl Debug for DataLayout

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

Formats the value using the given formatter.

impl Display for DataLayout

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

Formats the value using the given formatter.

impl Eq for DataLayout

impl PartialEq for DataLayout

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for DataLayout