Fix nullptr in releaseMemory and mfprops

Author: optimisan

llvm/include/llvm/CodeGen/LiveDebugVariables.h

@@ -81,7 +81,10 @@ class LiveDebugVariablesWrapperLegacy : public MachineFunctionPass {
   LiveDebugVariables &getLDV() { return *Impl; }
   const LiveDebugVariables &getLDV() const { return *Impl; }
 
-  void releaseMemory() override { Impl->releaseMemory(); }
+  void releaseMemory() override {
+    if (Impl)
+      Impl->releaseMemory();
+  }
   void getAnalysisUsage(AnalysisUsage &) const override;
 
   MachineFunctionProperties getSetProperties() const override {
@@ -97,6 +100,12 @@ class LiveDebugVariablesAnalysis
 
 public:
   using Result = LiveDebugVariables;
+
+  MachineFunctionProperties getSetProperties() const {
+    return MachineFunctionProperties().set(
+        MachineFunctionProperties::Property::TracksDebugUserValues);
+  }
+
   Result run(MachineFunction &MF, MachineFunctionAnalysisManager &MFAM);
 };
 

llvm/lib/CodeGen/LiveDebugVariables.cpp

@@ -38,6 +38,7 @@
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineOperand.h"
+#include "llvm/CodeGen/MachinePassManager.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/SlotIndexes.h"
 #include "llvm/CodeGen/TargetInstrInfo.h"
@@ -1323,6 +1324,8 @@ AnalysisKey LiveDebugVariablesAnalysis::Key;
 LiveDebugVariables
 LiveDebugVariablesAnalysis::run(MachineFunction &MF,
                                 MachineFunctionAnalysisManager &MFAM) {
+  MFPropsModifier _(*this, MF);
+
   auto *LIS = &MFAM.getResult<LiveIntervalsAnalysis>(MF);
   LiveDebugVariables LDV;
   LDV.analyze(MF, LIS);