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[clang][analyzer] Added partial wide character support to CStringChecker
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Authored by balazske on Jul 19 2022, 7:49 AM.

Details

Summary

Support for functions wmemcpy, wcslen, wcsnlen is added to the checker.
Documentation and tests are updated and extended with the new functions.

Diff Detail

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balazske created this revision.Jul 19 2022, 7:49 AM
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Nice improvement and the tests are meaningful!

clang/test/Analysis/cstring.c

Hadn't we have already a test file for this checker? What about string.c and bstring.c? You might have added redundant test cases in the new test file.

clang/test/Analysis/cstring.c
36 ↗(On Diff #445823)

Could you please elaborate why this does not work with str?

68–69 ↗(On Diff #445823)

I think, this would deserve a FIXME comment.

balazske updated this revision to Diff 446385.Jul 21 2022, 1:33 AM

Fix in overlap check, replaced test file.

I did not found the existing tests in other files, now all tests for the "non-wide" functions are copied for the "wide" functions. I do not like fully this solution but a single test file with macros for wide and non-wide case is probably not better.

balazske added inline comments.Jul 21 2022, 1:59 AM
clang/test/Analysis/wstring.c
385

The problem may be that the global constant is not encountered as statement when a function is analyzed.

martong accepted this revision.Jul 22 2022, 1:38 AM

Okay, thanks for the update. LGTM!

clang/test/Analysis/wstring.c
385

Do we have the same problem in the non-wide case?

This revision is now accepted and ready to land.Jul 22 2022, 1:38 AM
balazske added inline comments.Jul 22 2022, 5:24 AM
clang/test/Analysis/wstring.c
385

Yes (the previous "cstring.c" file contained that test). The problem looks fixable if the string length is computed at first use, not at the variable declaration.