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  1. //===- DataflowLattice.h ----------------------------------------*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8. //
  9. //  This file defines base types for building lattices to be used in dataflow
  10. //  analyses that run over Control-Flow Graphs (CFGs).
  11. //
  12. //===----------------------------------------------------------------------===//
  13.  
  14. #ifndef LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_DATAFLOWLATTICE_H
  15. #define LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_DATAFLOWLATTICE_H
  16.  
  17. namespace clang {
  18. namespace dataflow {
  19.  
  20. /// Effect indicating whether a lattice join operation resulted in a new value.
  21. // FIXME: Rename to `LatticeEffect` since `widen` uses it as well, and we are
  22. // likely removing it from `join`.
  23. enum class LatticeJoinEffect {
  24.   Unchanged,
  25.   Changed,
  26. };
  27.  
  28. } // namespace dataflow
  29. } // namespace clang
  30.  
  31. #endif // LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_DATAFLOWLATTICE_H
  32.