Enum CodeModel 

pub enum CodeModel {
    Small,
    Kernel,
}

Where the program’s code and static data are promised to be, which is -mcmodel=.

The model is a promise about addresses that the code generator is allowed to believe. It says nothing about which link is coming, which is -fPIC and friends, and it decides only how an address is written into an instruction. x86-64 is the only machine with more than one here.

Design: spec/11-asm-objects-debug.md section 11.3.

Variants

Small

Everything within 2 GiB of everything else, reached from the instruction pointer. The default on every target and every hosted program’s model.

Kernel

The top 2 GiB of the address space, from 0xffffffff80000000 up, which is where every x86-64 Linux kernel is linked. An address there is a 32 bit number sign extended, so an instruction may carry it as an immediate (movq $sym, %rax) or as the displacement of an indexed address (sym(,%rdi,8)), both with R_X86_64_32S.

Implementations

impl CodeModel

pub const fn as_str(self) -> &'static str

The spelling -mcmodel= takes, and the one __code_model_*__ is named after.

Trait Implementations

impl Clone for CodeModel

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CodeModel

impl Debug for CodeModel

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

Formats the value using the given formatter.

impl Default for CodeModel

fn default() -> Self

Returns the “default value” for a type.

impl Eq for CodeModel

impl Hash for CodeModel

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for CodeModel

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CodeModel