Enum LabelUse 

pub enum LabelUse {
    Branch14,
    Branch19,
    Branch26,
    Ldr19,
    Adr21,
    PCRel32,
    AdrpPage21,
    AddLo12,
}

Available on crate feature arm64 only.

Different forms of label references for different instruction formats.

Variants

Branch14

14-bit branch offset (conditional branches). PC-rel, offset is imm << 2. Immediate is 14 signed bits, in bits 18:5. Used by tbz and tbnz.

Branch19

19-bit branch offset (conditional branches). PC-rel, offset is imm << 2. Immediate is 19 signed bits, in bits 23:5. Used by cbz, cbnz, b.cond.

Branch26

26-bit branch offset (unconditional branches). PC-rel, offset is imm << 2. Immediate is 26 signed bits, in bits 25:0. Used by b, bl.

Ldr19

19-bit offset for LDR (load literal). PC-rel, offset is imm << 2. Immediate is 19 signed bits, in bits 23:5.

Adr21

21-bit offset for ADR (get address of label). PC-rel, offset is not shifted. Immediate is 21 signed bits, with high 19 bits in bits 23:5 and low 2 bits in bits 30:29.

PCRel32

32-bit PC relative constant offset (from address of constant itself), signed. Used in jump tables.

AdrpPage21

21-bit page offset for ADRP. The immediate is the signed difference between the 4KiB page of the label and the 4KiB page of the ADRP instruction, with high 19 bits in bits 23:5 and low 2 bits in bits 30:29. Equivalent to the R_AARCH64_ADR_PREL_PG_HI21 relocation.

AddLo12

Low 12 bits of the label’s address in the 12-bit immediate of an ADD (immediate), bits 21:10. Equivalent to the R_AARCH64_ADD_ABS_LO12_NC relocation. This has the same 4KiB-alignment requirement as AdrpPage21, with which it is paired.

Trait Implementations

impl Clone for LabelUse

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 LabelUse

impl Debug for LabelUse

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

Formats the value using the given formatter.

impl Eq for LabelUse

impl PartialEq for LabelUse

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for LabelUse