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Fix #789: Reduce False positives on A7-1-2 (VariableMissingConstexpr.ql) #794

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@rak3-sh rak3-sh commented Nov 11, 2024

Description

This PR fixes #789. Specifically it implements the below changes.

  1. Don't raise alerts on non-static member variables.
  2. Check the qualifiers of Call as well in isCompileTimeEvaluatedCall (using isCompileTimeEvaluatedExpression) to avoid raising this alert variables initialized by compiler generated variables. (e.g. range based for-loops).

Change request type

  • Release or process automation (GitHub workflows, internal scripts)
  • Internal documentation
  • External documentation
  • Query files (.ql, .qll, .qls or unit tests)
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  • Queries have been added for the following rules:
    • rule number here
  • Queries have been modified for the following rules:
    • A7-1-2

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  • No

🚨🚨🚨
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.ql file that imports it) is valid by running them within VS Code.

  • Confirmed

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  • Have all the relevant rule package description files been checked in?
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  • Have all the relevant rule package description files been checked in?
  • Have you verified that the metadata properties of each new query is set appropriately?
  • Do all the unit tests contain both "COMPLIANT" and "NON_COMPLIANT" cases?
  • Are the alert messages properly formatted and consistent with the style guide?
  • Have you run the queries on OpenPilot and verified that the performance and results are acceptable?
    As a rule of thumb, predicates specific to the query should take no more than 1 minute, and for simple queries be under 10 seconds. If this is not the case, this should be highlighted and agreed in the code review process.
  • Does the query have an appropriate level of in-query comments/documentation?
  • Have you considered/identified possible edge cases?
  • Does the query not reinvent features in the standard library?
  • Can the query be simplified further (not golfed!)

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rak3-sh commented Nov 11, 2024

@lcartey : Requesting your review on this PR to fix #789. Let me know your valuable suggestions!

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Thanks @rak3-sh! I have a suggestion on how to handle the non-static members.

@@ -42,6 +42,12 @@ where
not v.isConstexpr() and
not v instanceof Parameter and
not v.isAffectedByMacro() and
// Don't consider non-static member variables.
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As I suggested on the issue (#789) I think we should report non-static member variables, but only if all the member functions of the class have bodies. That should resolve the issue in the example.

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A7-1-2: Query proposes to add constexpr to non-static data members (and other problems)
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