lab1_init
lab2_init
lab3_init
lab1 finish, pass 8 cases
lab mergerd ,init
lab2 AST finish, pass all test cases
lab2 finish, pass 9 cases, except for one sub class
lab3 init
output a.out,pass the fac case!
java_ast - c_ast, pass 6 cases
pass 9 test cases, except sub class(tree visitor)
pass all the 10 test cases
bytecode pass Fac
fix some bug in lab2, pass two test cases
lab3 end
lab4 init