What is the difference between a phase and a pass of compilation? Under what circumstances does it make sense for a compiler to have multiple passes? What is the purpose of the compiler’s symbol...

What is the difference between a phase and a pass of compilation? Under what circumstances does it make sense for a compiler to have multiple passes? What is the purpose of the compiler’s symbol table? What is the difference between static and dynamic semantics? On modern machines, do assembly language programmers still tend to write better code than a good compiler can? Why or why not?