Function branch_dest

objdiff-core/src/arch/arm64.rs:146–174

(opcode: u16, address: u64, code: &[u8])

}

fn branch_dest(opcode: u16, address: u64, code: &[u8]) -> Option<u64> {
    const OPCODE_B: u16 = opcode_to_u16(Opcode::B);
    const OPCODE_BL: u16 = opcode_to_u16(Opcode::BL);
    const OPCODE_BCC: u16 = opcode_to_u16(Opcode::Bcc(0));
    const OPCODE_CBZ: u16 = opcode_to_u16(Opcode::CBZ);
    const OPCODE_CBNZ: u16 = opcode_to_u16(Opcode::CBNZ);
    const OPCODE_TBZ: u16 = opcode_to_u16(Opcode::TBZ);
    const OPCODE_TBNZ: u16 = opcode_to_u16(Opcode::TBNZ);

    let word = u32::from_le_bytes(code.try_into().ok()?);
    match opcode {
        OPCODE_B | OPCODE_BL => {
            let offset = ((word & 0x03ff_ffff) << 2) as i32;
            let extended_offset = (offset << 4) >> 4;
            address.checked_add_signed(extended_offset as i64)
        }
        OPCODE_BCC | OPCODE_CBZ | OPCODE_CBNZ => {
            let offset = (word as i32 & 0x00ff_ffe0) >> 3;
            let extended_offset = (offset << 11) >> 11;
            address.checked_add_signed(extended_offset as i64)
        }
        OPCODE_TBZ | OPCODE_TBNZ => {
            let offset = (word as i32 & 0x0007_ffe0) >> 3;
            let extended_offset = (offset << 16) >> 16;
            address.checked_add_signed(extended_offset as i64)
        }
        _ => None,
    }
}

struct DisplayCtx<'a> {
    address: u64,