text: //===- ScheduleDAGMutation.h - MachineInstr Scheduling ----------*- C++ -*-===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  //
  // This file implements the ScheduleDAGMutation class, which represents
  // a target-specific mutation of the dependency graph for scheduling.
  //
  //===----------------------------------------------------------------------===//
  
  #ifndef LLVM_CODEGEN_SCHEDULEDAGMUTATION_H
  #define LLVM_CODEGEN_SCHEDULEDAGMUTATION_H
  
  namespace llvm {
  
  class ScheduleDAGInstrs;
  
  /// Mutate the DAG as a postpass after normal DAG building.
  class ScheduleDAGMutation {
    virtual void anchor();
  
  public:
    virtual ~ScheduleDAGMutation() = default;
  
    virtual void apply(ScheduleDAGInstrs *DAG) = 0;
  };
  
  } // end namespace llvm
  
  #endif // LLVM_CODEGEN_SCHEDULEDAGMUTATION_H
  