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  1. //===-- Transfer.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 a transfer function that evaluates a program statement and
  10. //  updates an environment accordingly.
  11. //
  12. //===----------------------------------------------------------------------===//
  13.  
  14. #ifndef LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_TRANSFER_H
  15. #define LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_TRANSFER_H
  16.  
  17. #include "clang/AST/Stmt.h"
  18. #include "clang/Analysis/FlowSensitive/DataflowAnalysisContext.h"
  19. #include "clang/Analysis/FlowSensitive/DataflowEnvironment.h"
  20.  
  21. namespace clang {
  22. namespace dataflow {
  23.  
  24. /// Maps statements to the environments of basic blocks that contain them.
  25. class StmtToEnvMap {
  26. public:
  27.   virtual ~StmtToEnvMap() = default;
  28.  
  29.   /// Returns the environment of the basic block that contains `S` or nullptr if
  30.   /// there isn't one.
  31.   /// FIXME: Ensure that the result can't be null and return a const reference.
  32.   virtual const Environment *getEnvironment(const Stmt &S) const = 0;
  33. };
  34.  
  35. /// Evaluates `S` and updates `Env` accordingly.
  36. ///
  37. /// Requirements:
  38. ///
  39. ///  `S` must not be `ParenExpr` or `ExprWithCleanups`.
  40. void transfer(const StmtToEnvMap &StmtToEnv, const Stmt &S, Environment &Env);
  41.  
  42. } // namespace dataflow
  43. } // namespace clang
  44.  
  45. #endif // LLVM_CLANG_ANALYSIS_FLOWSENSITIVE_TRANSFER_H
  46.