Struct FrameInput 

pub struct FrameInput<'a> {
    pub slots: &'a [SlotKind],
    pub written: RegSet,
    pub has_calls: bool,
    pub outgoing: u32,
    pub frame_pointer: bool,
}

Everything about a function the frame depends on.

Function::frame_layout fills this in from a function; build one by hand to lay out a frame for code that is not MIR.

Examples

use backend_lang::RegSet;
use backend_lang::mir::SlotKind;
use backend_lang::target::frame::FrameInput;
use backend_lang::x86_64::{SYSV, RBX};

let slots = [SlotKind::Local { size: 8, align: 8 }];
let input = FrameInput {
    slots: &slots,
    written: RegSet::of(&[RBX]),
    has_calls: true,
    outgoing: 0,
    frame_pointer: true,
};
let frame = SYSV.layout_frame(&input)?;
assert_eq!(frame.pushed(), [RBX]);

Fields

slots: &'a [SlotKind]

The function’s stack slots, indexed by StackSlot::index.

written: RegSet

The registers the function writes; the callee-saved ones among them are saved and restored.

has_calls: bool

Whether the function calls anything (then the stack is 16-aligned at each call, the red zone is off, and Win64 shadow space is reserved).

outgoing: u32

Bytes of outgoing argument area the function’s calls need (the largest Abi::assign_args result over its calls).

frame_pointer: bool

Whether to keep a frame pointer.

Trait Implementations

impl<'a> Clone for FrameInput<'a>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for FrameInput<'a>

impl<'a> Debug for FrameInput<'a>

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

Formats the value using the given formatter.