一种异常处理策略的评测方法.pdfVIP

Journal of Southeast University(English Edition) Vo1．23，No．4，PP．524—528 Dec．2007 ISSN 1003—7985 Approach to evaluatinR exception handling or Programs● l · - ·● ·● l ■ n Jiang Shujuan Xu Baowen ( School of Computer Science and Technology，China University of Mining and Technology，Xuzhou 221 1 16，China) ( School of Computer Science and Engineering，Southeast University，Nanjing 210096，China) Abstract：To solve the problems that the exception handling code is hard to test and maintain and that it affects the robustness and reliability of software，a method for evaluating the exception handling of programs is presented．The exception propagation graph(EPG)that describes the large programs with exception handling constructs is proposed by simplifying the control flow graph and it is applied to a case to verify its validity． According to the EPG．the exception handling code that never executes is identified；the points that are the most critical to controlling exception propagation are found；and the irrational exception handling code is corrected．The constructing algorithm for the EPG is given；thus，this provides a basis for automatically constructing the EPG and automatically correcting the irrational exception handling code． Key words：software robustness；exception handling；exception propagation；evaluating program ；control flow graph Most modem programming languages provide an before it runs．and correct the lrrational parts。the ro— exception handling mechanism．Syntactically，an excep— bustness of the program is improved．Th is is a useful tion handling mechanism provides a means to raise an work for large programs． exceptional condition explicitly，and a means to express