是JBMC(Bounded Model Checker)的新手。我们需要找出运行时异常的可能性,而运行时异常可能在不运行Java程序的情况下发生。我们搜索了一些抽象解释框架,发现JBMC在这种情况下会有所帮助。
例如 :
public class SampleClass {
public static void main(String[] args)
{
int ar[] = {1, 2, 3, 4, 5};
for (int i=0; i<=ar.length; i++)
System.out.println(ar[i]);
}
}
在上面的程序中,当循环在第6次迭代期间运行时,我们将获得ArrayIndexOutOfBoundException。但是如何使用JBMC对此进行预测?我们已经在JBMC中找到了提供Command line options细节的命令表,但是我们找不到命令的组合以及如何使用它。 JBMC是否有可用的Java API或文档?
请建议!
最佳答案
与CBMC不同,JBMC不支持here中列出的所有选项。
您可以通过运行jbmc --help
注意到这一点。如果您运行类似jbmc <class> --bounds-check
的程序,则会得到“使用错误”。
关于Java类:jbmc适用于.jar或.class。
尝试首先生成一个.class,如下所示:javac SampleClass.java
然后在SampleClass.class
上运行jbmc,如下所示:jbmc SampleClass.class --unwind N
(尝试使用不同的N值变得更加自信)
在N = 6的结果以下:
JBMC version 5.12 (cbmc-5.11-3477-gcd70727ed) 64-bit x86_64 linux
Parsing SampleClass.class
...
** Results:
[array-create-negative-size.1] Array size should be >= 0: SUCCESS
[array-create-negative-size.2] Array size should be >= 0: SUCCESS
[array-create-negative-size.3] Array size should be >= 0: SUCCESS
[array-create-negative-size.4] Array size should be >= 0: SUCCESS
[array-create-negative-size.5] Array size should be >= 0: SUCCESS
[array-create-negative-size.6] Array size should be >= 0: SUCCESS
[array-create-negative-size.7] Array size should be >= 0: SUCCESS
[array-create-negative-size.8] Array size should be >= 0: SUCCESS
[array-create-negative-size.9] Array size should be >= 0: SUCCESS
SampleClass.java function java::SampleClass.main:([Ljava/lang/String;)V
[java::SampleClass.main:([Ljava/lang/String;)V.null-pointer-exception.1] line 4 Null pointer check: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-index-out-of-bounds-high.5] line 4 Array index should be < length: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-index-out-of-bounds-high.2] line 4 Array index should be < length: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.null-pointer-exception.3] line 4 Null pointer check: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-index-out-of-bounds-low.3] line 4 Array index should be >= 0: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-index-out-of-bounds-high.3] line 4 Array index should be < length: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.null-pointer-exception.4] line 4 Null pointer check: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-index-out-of-bounds-low.4] line 4 Array index should be >= 0: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-index-out-of-bounds-high.4] line 4 Array index should be < length: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.null-pointer-exception.5] line 4 Null pointer check: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.1] line 4 no uncaught exception: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-index-out-of-bounds-low.5] line 4 Array index should be >= 0: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-create-negative-size.1] line 4 Array size should be >= 0: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.null-pointer-exception.2] line 4 Null pointer check: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-index-out-of-bounds-low.1] line 4 Array index should be >= 0: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-index-out-of-bounds-high.1] line 4 Array index should be < length: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-index-out-of-bounds-low.2] line 4 Array index should be >= 0: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.null-pointer-exception.6] line 5 Null pointer check: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.null-pointer-exception.7] line 6 Null pointer check: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-index-out-of-bounds-low.6] line 6 Array index should be >= 0: SUCCESS
[java::SampleClass.main:([Ljava/lang/String;)V.array-index-out-of-bounds-high.6] line 6 Array index should be < length: FAILURE
[java::SampleClass.main:([Ljava/lang/String;)V.null-pointer-exception.8] line 6 Null pointer check: SUCCESS
** 1 of 31 failed (2 iterations)
VERIFICATION FAILED
我希望这有帮助。
我也是jbmc的新手。我过去使用过cbmc,可以在here和here中找到更多文档,但是jbmc很少有文档。