Struct Flags 

pub struct Flags {
    pub frame_pointer: bool,
    pub red_zone: bool,
    pub stack_clash: bool,
    pub landing: bool,
    pub profile: Profile,
    pub patch: Room,
    pub reorder: bool,
}

What the command line says about a frame, as opposed to what the machine says.

Fields

frame_pointer: bool

Whether every function keeps a frame pointer, which -fno-omit-frame-pointer asks for.

red_zone: bool

Whether the red zone may be used, which -mno-red-zone and every kernel turns off.

stack_clash: bool

Whether a frame is taken a page at a time, which -fstack-clash-protection asks for.

landing: bool

Whether every address an indirect branch may arrive at opens with a landing pad, which -fcf-protection=branch asks for. That is every function, and every label of a function whose address the program took.

profile: Profile

Whether every function calls a profiler on the way in, which -pg asks for.

patch: Room

How much room every function opens with for a patcher, which -fpatchable-function-entry= asks for. See Room.

reorder: bool

Whether the blocks are put in the order the weights say rather than in the order the shape of the graph says, which -freorder-blocks asks for and every level above -O0 turns on. See crate::layout.

Trait Implementations

impl Clone for Flags

fn clone(&self) -> Flags

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Flags

impl Debug for Flags

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

Formats the value using the given formatter.

impl Default for Flags

fn default() -> Self

No frame pointer, the red zone allowed, the frame taken in one subtraction, no landing pad, no profiling, no room for a patcher and the blocks in the order the graph’s shape gives, which is what a convention that has a red zone says at -O0 when nobody on the command line has said otherwise.

impl Eq for Flags

impl PartialEq for Flags

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Flags