In order to meet the needs of data flow analysis, system build control flow graph (CFG), directed acyclic graph (DAG), and call graph (CG). 3.

• 系统通过建立程序控制流图(CFG)、有向无环图(DAG)、以及过程调用图(CG)三种程序中间表示视图，满足了数据流分析的需要。