Struct Probing 

pub struct Probing<'a> {
    pub probe: &'a Probe,
    pub branch: &'a BranchInsts,
    pub scratch: [PhysReg; 2],
}

What a function that takes its stack a page at a time needs beyond the frame.

What -fstack-clash-protection asks for, and the same three kinds of thing Protect is: one fact about the platform, one about the machine, and two registers that are neither. See rucc_target::Probe for what the sequence is defending against.

Read in two places, because a function has two ways of moving its stack pointer and the flag is about both of them. The prologue takes the frame the layout worked out, and a variable length array takes however many bytes its declaration asked for while the function runs. The same three things answer both.

Fields

probe: &'a Probe

What touches a page and how far apart the pages are.

branch: &'a BranchInsts

What a branch on a register is, which is what the loop under a large frame ends with.

scratch: [PhysReg; 2]

The two registers the sequence may use, which are two the allocator never handed out.

Trait Implementations

impl<'a> Clone for Probing<'a>

fn clone(&self) -> Probing<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for Probing<'a>

impl<'a> Debug for Probing<'a>

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

Formats the value using the given formatter.