Method from_slice

cranelift/filetests/src/test_unwind.rs:119–148

(mem: &[u8])

    impl UnwindInfo {
        fn from_slice(mem: &[u8]) -> Self {
            let version_and_flags = mem[0];
            let prologue_size = mem[1];
            let unwind_code_count_raw = mem[2];
            let frame_register_and_offset = mem[3];
            let mut unwind_codes = Vec::new();

            let mut i = 0;
            while i < unwind_code_count_raw {
                let code = UnwindCode::from_slice(&mem[(4 + (i * 2) as usize)..]);

                i += match &code.value {
                    UnwindValue::None => 1,
                    UnwindValue::U16(_) => 2,
                    UnwindValue::U32(_) => 3,
                };

                unwind_codes.push(code);
            }

            Self {
                version: version_and_flags & 0x3,
                flags: (version_and_flags & 0xF8) >> 3,
                prologue_size,
                unwind_code_count_raw,
                frame_register: frame_register_and_offset & 0xF,
                frame_register_offset: (frame_register_and_offset & 0xF0) >> 4,
                unwind_codes,
            }
        }
    }

    #[derive(Debug)]