Method for checking null pointer in source code and computer system

Abstract

The invention discloses a method for checking a null pointer in a source code, comprising: a computer system construction referencable variable type dictionary, a computer system receiving an instruction for scanning the null pointer, formatting the source code to be checked; scanning the global code zone of the source code to be checked and obtaining an uninitialized global variable list corresponding to the variable statement type in the dictionary; scanning the method zone of the source code to be checked and obtaining the uninitialized local variable list corresponding to the variable statement type in the dictionary; acquiring uninitialized global variable list in method based on the uninitialized global variable list; scanning the method zone of the source code to be checked, searching the called variable name, if the called variable name is in the uninitialized local variable list or uninitialized global variable list in method, the found called variable name is the null pointerin the source code. The invention also discloses a computer system.

Description

technical field [0001] The present application relates to the technical field of null pointer detection, in particular to a method and computer system for checking null pointers in source codes. Background technique [0002] In a computer program, a pointer with an indeterminate value will randomly generate a value, a pointer that does not know where to point, or a pointer that points to a pointer that is out of range is very dangerous, because this uncertainty can paralyze the program, so it is necessary to Define a null pointer to accommodate these uncertainties. This null pointer is also commonly referred to as a null pointer. [0003] The following takes the JAVA language as an example to provide a simple example of a null pointer: [0004] / / Source code of Hello.java [0005] import com.xx.Bye; [0006] public class Hello{ [0007] private Integer num1; / / Declare an integer pointer num1 [0008] private bye bye; [0009] public int getNum(){ [0010] return nu...

AI Technical Summary

Problems solved by technology

) The null pointer of the parameter is not checked, therefore, the null pointer problem in many cases cannot be scanned

[0020] In addition, due to the instability of the program, the code parsing process is complicated and error-prone, etc., it often leads to the null pointer problem that cannot be scanned

[0021] 2. The scanning tool is relatively large and the scanning speed is slow

[0024] Existing findbugs often require the code to be compiled before scanning, because it mainly scans bytecodes and cannot scan source codes, so it needs to be compiled, and compiling is cumbersome and requires a lot of preparation time, which is contrary to the spirit of program development

[0025] 4. The existing algorithms used for null pointer scanning tools are relatively backward. It constructs a large number of complex regular expression lists, and recursively calls regular expressions, which consumes a lot of CPU and other resources.

Images