Shulou(Shulou.com)06/02 Report--

This article mainly explains "what are the advantages of Java static code analysis tool". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what are the advantages of Java static code analysis tool".

Static code analysis means to check the correctness of the program by analyzing or checking the syntax, structure, process, interface and so on of the source program without running the tested code, so as to find out the errors and defects behind the code, such as parameter mismatch, ambiguous nested statements, error recursion, illegal calculation, possible null pointer references and so on.

In the process of software development, static code analysis is often carried out before dynamic testing, and it can also be used as a reference for the development of dynamic test cases. Statistics show that 30% to 70% of the code logic design and coding defects in the whole software development life cycle can be found and fixed by static code analysis.

However, because static code analysis often requires a lot of time consumption and the accumulation of related knowledge, for software development teams, using static code analysis tools to automate code inspection and analysis can greatly improve software reliability and save software development and testing costs.

Under what circumstances do you need static program analysis?

Static program analysis is often a stage of the code review process in a multi-person project, because static analysis can be carried out after writing a part of the code, and the analysis process does not need to execute the whole program. This helps to find the following problems in the early stages of the project: variable declaration but not used, variable type mismatch, variable undefined before use, unreachable code, dead loop, array out of bounds, memory leakage, and so on.

Advantages of static code analysis tools

1. Help program developers automatically perform static code analysis to quickly locate code-behind errors and defects.

two。 Help code designers focus more on analyzing and resolving code design defects.

3. Significantly reduce the time spent on line-by-line review of code, improve software reliability and save software development and testing costs.

Theoretical basis and main techniques of Java static Code Analysis

Defect pattern matching: defect pattern matching collects enough common defect patterns from code analysis experience in advance, and matches the code to be analyzed with the existing common defect patterns, so as to complete the security analysis of the software. The advantage of this method is simple and convenient, but it requires enough built-in defect patterns and is prone to false positives.

Type inference: type inference technology refers to reasoning about the types of operands in the code to ensure that each statement in the code is executed against the correct type. This technique will first predefine a set of type mechanisms, including inference rules such as class equivalence and type inclusion, and then carry out reasoning calculation based on these rules. Type inference can check for type errors in code, which is simple, efficient and suitable for rapid detection of code defects.

Model checking: model checking is based on the concept of finite state automata, which abstracts the analyzed code into an automaton system and assumes that the system is in a finite state or can be abstracted into a finite state. In the process of model checking, the influence of each statement in the analyzed code is abstracted as a state of a finite state automaton, and then the code analysis is achieved by analyzing the finite state machine. Model checking is mainly suitable for testing program concurrency and other timing characteristics, but it plays a weak role in data range, data type and so on.

Data flow analysis: data flow analysis is also a software verification technology, which analyzes the assignment, reference and transmission of variables in the program by collecting variable information referenced in the code. By analyzing the data flow, you can determine the definition of variables and how they are referenced in the code. At the same time, you can also check for code data flow exceptions, such as references are assigned before, only values are assigned without references, and so on. Data flow analysis is mainly suitable for checking the characteristics of the data domain in the program.

Java static analysis tool CA is based on Java development, Java Swing mode to support the system to run across platforms; support C, C++, Java and other programming languages scanning; support windows platform, linux platform, command line environment, IDE environment. The rules include the national military standard 5369 minisrac 5369, the national military standard 5369 (C++), the Java sun programming specification, the Java sun security rules, etc.

Thank you for your reading, the above is the content of "what are the advantages of Java static code analysis tools". After the study of this article, I believe you have a deeper understanding of what the advantages of Java static code analysis tools are, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.