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  1. //===- ScheduleDAGMutation.h - MachineInstr Scheduling ----------*- 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 implements the ScheduleDAGMutation class, which represents
  10. // a target-specific mutation of the dependency graph for scheduling.
  11. //
  12. //===----------------------------------------------------------------------===//
  13.  
  14. #ifndef LLVM_CODEGEN_SCHEDULEDAGMUTATION_H
  15. #define LLVM_CODEGEN_SCHEDULEDAGMUTATION_H
  16.  
  17. namespace llvm {
  18.  
  19. class ScheduleDAGInstrs;
  20.  
  21. /// Mutate the DAG as a postpass after normal DAG building.
  22. class ScheduleDAGMutation {
  23.   virtual void anchor();
  24.  
  25. public:
  26.   virtual ~ScheduleDAGMutation() = default;
  27.  
  28.   virtual void apply(ScheduleDAGInstrs *DAG) = 0;
  29. };
  30.  
  31. } // end namespace llvm
  32.  
  33. #endif // LLVM_CODEGEN_SCHEDULEDAGMUTATION_H
  34.