Function tracing_read 

pub fn tracing_read<const N: usize>(
    memory: &mut TracingMemory,
    address_space: u32,
    ptr: u32,
    prev_timestamp: &mut u32,
) -> [u8; N]

Reads register value at reg_ptr from memory and records the memory access in mutable buffer. Trace generation relevant to this memory access can be done fully from the recorded buffer.