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  1. //===-- EscapeEnumerator.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. // Defines a helper class that enumerates all possible exits from a function,
  10. // including exception handling.
  11. //
  12. //===----------------------------------------------------------------------===//
  13.  
  14. #ifndef LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H
  15. #define LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H
  16.  
  17. #include "llvm/IR/Function.h"
  18. #include "llvm/IR/IRBuilder.h"
  19.  
  20. namespace llvm {
  21.  
  22. class DomTreeUpdater;
  23.  
  24. /// EscapeEnumerator - This is a little algorithm to find all escape points
  25. /// from a function so that "finally"-style code can be inserted. In addition
  26. /// to finding the existing return and unwind instructions, it also (if
  27. /// necessary) transforms any call instructions into invokes and sends them to
  28. /// a landing pad.
  29. class EscapeEnumerator {
  30.   Function &F;
  31.   const char *CleanupBBName;
  32.  
  33.   Function::iterator StateBB, StateE;
  34.   IRBuilder<> Builder;
  35.   bool Done = false;
  36.   bool HandleExceptions;
  37.  
  38.   DomTreeUpdater *DTU;
  39.  
  40. public:
  41.   EscapeEnumerator(Function &F, const char *N = "cleanup",
  42.                    bool HandleExceptions = true, DomTreeUpdater *DTU = nullptr)
  43.       : F(F), CleanupBBName(N), StateBB(F.begin()), StateE(F.end()),
  44.         Builder(F.getContext()), HandleExceptions(HandleExceptions), DTU(DTU) {}
  45.  
  46.   IRBuilder<> *Next();
  47. };
  48.  
  49. }
  50.  
  51. #endif // LLVM_TRANSFORMS_UTILS_ESCAPEENUMERATOR_H
  52.