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This is what you need to correctly analyze OSSA. - computeLinearLiveness - computeInteriorLiveness - InteriorUseVisitor - OwnershipUseVisitor - LivenessBoundary Along with BorrowUtils.swift, all of our OSSA transformations are built on top of these fundamentals. With these APIs, we can build anything OSSA-related in SwiftCompilerSources. These utilities are immediately needed for borrowed arguments and lifetime dependence. In the near future, we can also use them to complete OSSA lifetimes and *correctly* fixup OSSA after transformation without introducing lots of copies and creating lots of incorrect corner cases.