pub fn get_buffer_accesses(op: u8, stack: &[U256]) -> Option<BufferAccesses>Expand description
A utility function to get the buffer access.
The memory_access variable stores the index on the stack that indicates the buffer offset/len accessed by the given opcode: (read buffer, buffer read offset, buffer read len, write memory offset, write memory len) >= 1: the stack index 0: no memory access -1: a fixed len of 32 bytes -2: a fixed len of 1 byte
The return value is a tuple about accessed buffer region by the given opcode: (read buffer, buffer read offset, buffer read len, write memory offset, write memory len)