2 files changed, 4 insertions, 1 deletions
diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h
index 736a0a2..58ca907 100644
--- a/include/llvm/CodeGen/MachineRegisterInfo.h
+++ b/include/llvm/CodeGen/MachineRegisterInfo.h
@@ -30,8 +30,9 @@ class PSetIterator;
 class MachineRegisterInfo {
 public:
   class Delegate {
+    virtual void anchor();
   public:
-    virtual void MRI_NoteNewVirtualRegister(unsigned Reg) {}
+    virtual void MRI_NoteNewVirtualRegister(unsigned Reg) = 0;
 
     virtual ~Delegate() {}
   };
diff --git a/include/llvm/CodeGen/MachineScheduler.h b/include/llvm/CodeGen/MachineScheduler.h
index e6af370..7782895 100644
--- a/include/llvm/CodeGen/MachineScheduler.h
+++ b/include/llvm/CodeGen/MachineScheduler.h
@@ -164,6 +164,7 @@ struct MachineSchedPolicy {
 /// Initialization sequence:
 ///   initPolicy -> shouldTrackPressure -> initialize(DAG) -> registerRoots
 class MachineSchedStrategy {
+  virtual void anchor();
 public:
   virtual ~MachineSchedStrategy() {}
 
@@ -262,6 +263,7 @@ public:
 
 /// Mutate the DAG as a postpass after normal DAG building.
 class ScheduleDAGMutation {
+  virtual void anchor();
 public:
   virtual ~ScheduleDAGMutation() {}