RFR: 8343802: Prevent NULL usage backsliding [v3]

[Nizar Benalla]

On Fri, 7 Feb 2025 13:11:27 GMT, Nizar Benalla <nbenalla at openjdk.org> wrote:

>> Please review this patch to add a test that checks the hotspot sources and test files for usages of NULL.
>> It scans files in those directories, filtering out certain files as well as all `.c`, `.java` and `.jar` files in test sources. 
>> 
>> Before adding line 86 and excluding `os_windows.cpp`, the test failed with:
>> 
>> 
>> Error: 'NULL' found in /w/jdk/src/hotspot/os/windows/os_windows.cpp at line 4436:
>>     HMODULE hModule = NULL;
>> Error: 'NULL' found in /w/jdk/src/hotspot/os/windows/os_windows.cpp at line 4437:
>>     GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT, NULL, &hModule);
>> java.lang.RuntimeException: Found usage of 'NULL' in source files. See errors above.
>> 	at TestNoNULL.main(TestNoNULL.java:73)
>> 	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
>> 	at java.base/java.lang.reflect.Method.invoke(Method.java:565)
>> 	at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:333)
>> 	at java.base/java.lang.Thread.run(Thread.java:1447)
>
> Nizar Benalla has updated the pull request incrementally with one additional commit since the last revision:
> 
>   revert to the original regex and remove the exclusion of os_windows.cpp

I've made one last (hopefully trivial) change to filter out `.class` files to be consistent

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PR Comment: https://git.openjdk.org/jdk/pull/23466#issuecomment-2643116375