Add minimal binary pattern support for null checks in DFA #6877
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Codecov Report
Additional details and impacted files@@ Coverage Diff @@
## main #6877 +/- ##
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- Coverage 96.39% 96.39% -0.01%
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Files 1403 1403
Lines 330977 331075 +98
Branches 10890 10900 +10
==========================================
+ Hits 319055 319148 +93
- Misses 9188 9191 +3
- Partials 2734 2736 +2 |
Youssef1313
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mavasani
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| @@ -1612,6 +1612,25 @@ private void PerformPredicateAnalysisCore(IOperation operation, TAnalysisData ta | |||
| case OperationKind.BinaryPattern: | |||
| // These high level patterns should not be present in the lowered CFG: https://github.com/dotnet/roslyn/issues/47068 | |||
| predicateValueKind = PredicateValueKind.Unknown; | |||
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| // We special case common null check to reduce false positives. But this implementation for BinaryPattern is very incomplete. | |||
| if (FlowBranchConditionKind == ControlFlowConditionKind.WhenFalse) | |||
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This is a nice optimization! Generic flow analysis handling for binary pattern operations is going to be non-trivial as there are sort of conditional branches with the and and or operators. I think this is a good starting point to handle the most important cases.
This was referenced Jul 28, 2025
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This was referenced Aug 4, 2025
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Fixes #6755
@mavasani I have added very very minimal handling for binary patterns.
This doesn't handle declaration patterns, etc etc.
I can try to go further with the implementation whenever I get time again :)
I know my implementation might not be good enough. So, feel free if you wanted to close this PR and have a completely different fix.