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codeql/cpp/old-change-notes/2020-09-29-range-analysis-rollup.md
Dave Bartolomeo fa40d59332 Move older change notes to old-change-notes 
Now that change notes are per-package, new change notes should be created in the `change-notes` folder under the affected pack (e.g., `cpp/ql/src/change-notes` for C++ query change notes. I've moved all of the change note files that were added before we started publishing them in packs to an `old-change-notes` directory under each language, to reduce the temptation to add new change notes there.

I'm working on a document to describe how and when to create change notes for packs separately.
2021-12-14 12:35:04 -05:00

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  • The SimpleRangeAnalysis library has gained support for several language constructs it did not support previously. These improvements primarily affect the queries cpp/constant-comparison, cpp/comparison-with-wider-type, and cpp/integer-multiplication-cast-to-long. The newly supported language features are:
    • Multiplication of unsigned numbers.
    • Multiplication by a constant.
    • Reference-typed function parameters.
    • Comparing a variable not equal to an endpoint of its range, thus narrowing the range by one.
    • Using if (x) or if (!x) or similar to test for equality to zero.
  • The SimpleRangeAnalysis library can now be extended with custom rules. See examples in cpp/ql/src/experimental/semmle/code/cpp/rangeanalysis/extensions/.