MPCS-51300编译器 队员 Zhong Chu Tianda Liu 用法 python ekcc.py [-emit-ast -emit-llvm -jit -O] <input_file> [args] -emit-ast: save ast to <input_file_name>.yaml -emit-llvm: save ir to <input_file_name>.ll -jit: execute the source code directly and print results t