CopyToAnalysis is a dataflow analysis to track AnalysisEntity instances that share the same value or reference.
var x = new MyClass();
object y = x;
In this case there will be two AnalysisEntity instances, one for x and one for y and CopyAnalysis will compute that variables x and y have identical CopyAbstractValue with CopyAbstractValueKind.KnownReferenceCopy.
int c1 = 0;
int c2 = c1;
In this case it will compute that c1 and c2 have identical CopyAbstractValue with CopyAbstractValueKind.KnownValueCopy.
According to documentation, CopyAnalysis is currently off by default for all analyzers as it has known performance issues and needs performance tuning. It can be enabled by end users with editorconfig option copy_analysis.
Dataflow analysis to track values assigned to one or more properties of an object to identify and flag incorrect/insecure object state.
Currently the API is internal and cannot be used outside roslyn-analyzers.