Use unique_ptr to manage objects owned by the ScheduleDAGMI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206784 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineScheduler.h

@@ -81,6 +81,8 @@
 #include "llvm/CodeGen/RegisterPressure.h"
 #include "llvm/CodeGen/ScheduleDAGInstrs.h"
 
+#include <memory>
+
 namespace llvm {
 
 extern cl::opt<bool> ForceTopDown;
@@ -221,14 +223,14 @@ public:
 class ScheduleDAGMI : public ScheduleDAGInstrs {
 protected:
   AliasAnalysis *AA;
-  MachineSchedStrategy *SchedImpl;
+  std::unique_ptr<MachineSchedStrategy> SchedImpl;
 
   /// Topo - A topological ordering for SUnits which permits fast IsReachable
   /// and similar queries.
   ScheduleDAGTopologicalSort Topo;
 
   /// Ordered list of DAG postprocessing steps.
-  std::vector<ScheduleDAGMutation*> Mutations;
+  std::vector<std::unique_ptr<ScheduleDAGMutation>> Mutations;
 
   /// The top of the unscheduled zone.
   MachineBasicBlock::iterator CurrentTop;
@@ -246,17 +248,19 @@ protected:
   unsigned NumInstrsScheduled;
 #endif
 public:
-  ScheduleDAGMI(MachineSchedContext *C, MachineSchedStrategy *S, bool IsPostRA):
-    ScheduleDAGInstrs(*C->MF, *C->MLI, *C->MDT, IsPostRA,
-                      /*RemoveKillFlags=*/IsPostRA, C->LIS),
-    AA(C->AA), SchedImpl(S), Topo(SUnits, &ExitSU), CurrentTop(),
-    CurrentBottom(), NextClusterPred(nullptr), NextClusterSucc(nullptr) {
+  ScheduleDAGMI(MachineSchedContext *C, std::unique_ptr<MachineSchedStrategy> S,
+                bool IsPostRA)
+      : ScheduleDAGInstrs(*C->MF, *C->MLI, *C->MDT, IsPostRA,
+                          /*RemoveKillFlags=*/IsPostRA, C->LIS),
+        AA(C->AA), SchedImpl(std::move(S)), Topo(SUnits, &ExitSU), CurrentTop(),
+        CurrentBottom(), NextClusterPred(nullptr), NextClusterSucc(nullptr) {
 #ifndef NDEBUG
     NumInstrsScheduled = 0;
 #endif
   }
 
-  virtual ~ScheduleDAGMI();
+  // Provide a vtable anchor
+  ~ScheduleDAGMI() override;
 
   /// Return true if this DAG supports VReg liveness and RegPressure.
   virtual bool hasVRegLiveness() const { return false; }
@@ -266,8 +270,8 @@ public:
   /// building and before MachineSchedStrategy initialization.
   ///
   /// ScheduleDAGMI takes ownership of the Mutation object.
-  void addMutation(ScheduleDAGMutation *Mutation) {
-    Mutations.push_back(Mutation);
+  void addMutation(std::unique_ptr<ScheduleDAGMutation> Mutation) {
+    Mutations.push_back(std::move(Mutation));
   }
 
   /// \brief True if an edge can be added from PredSU to SuccSU without creating
@@ -375,11 +379,12 @@ protected:
   RegPressureTracker BotRPTracker;
 
 public:
-  ScheduleDAGMILive(MachineSchedContext *C, MachineSchedStrategy *S):
-    ScheduleDAGMI(C, S, /*IsPostRA=*/false), RegClassInfo(C->RegClassInfo),
-    DFSResult(nullptr), ShouldTrackPressure(false), RPTracker(RegPressure),
-    TopRPTracker(TopPressure), BotRPTracker(BotPressure)
-  {}
+  ScheduleDAGMILive(MachineSchedContext *C,
+                    std::unique_ptr<MachineSchedStrategy> S)
+      : ScheduleDAGMI(C, std::move(S), /*IsPostRA=*/false),
+        RegClassInfo(C->RegClassInfo), DFSResult(nullptr),
+        ShouldTrackPressure(false), RPTracker(RegPressure),
+        TopRPTracker(TopPressure), BotRPTracker(BotPressure) {}
 
   virtual ~ScheduleDAGMILive();
 

lib/CodeGen/MachineScheduler.cpp

@@ -487,9 +487,8 @@ void ReadyQueue::dump() {
 // virtual registers.
 // ===----------------------------------------------------------------------===/
 
+// Provide a vtable anchor.
 ScheduleDAGMI::~ScheduleDAGMI() {
-  DeleteContainerPointers(Mutations);
-  delete SchedImpl;
 }
 
 bool ScheduleDAGMI::canAddEdge(SUnit *SuccSU, SUnit *PredSU) {
@@ -3002,17 +3001,17 @@ void GenericScheduler::schedNode(SUnit *SU, bool IsTopNode) {
 /// Create the standard converging machine scheduler. This will be used as the
 /// default scheduler if the target does not set a default.
 static ScheduleDAGInstrs *createGenericSchedLive(MachineSchedContext *C) {
-  ScheduleDAGMILive *DAG = new ScheduleDAGMILive(C, new GenericScheduler(C));
+  ScheduleDAGMILive *DAG = new ScheduleDAGMILive(C, make_unique<GenericScheduler>(C));
   // Register DAG post-processors.
   //
   // FIXME: extend the mutation API to allow earlier mutations to instantiate
   // data and pass it to later mutations. Have a single mutation that gathers
   // the interesting nodes in one pass.
-  DAG->addMutation(new CopyConstrain(DAG->TII, DAG->TRI));
+  DAG->addMutation(make_unique<CopyConstrain>(DAG->TII, DAG->TRI));
   if (EnableLoadCluster && DAG->TII->enableClusterLoads())
-    DAG->addMutation(new LoadClusterMutation(DAG->TII, DAG->TRI));
+    DAG->addMutation(make_unique<LoadClusterMutation>(DAG->TII, DAG->TRI));
   if (EnableMacroFusion)
-    DAG->addMutation(new MacroFusion(DAG->TII));
+    DAG->addMutation(make_unique<MacroFusion>(DAG->TII));
   return DAG;
 }
 
@@ -3198,7 +3197,7 @@ void PostGenericScheduler::schedNode(SUnit *SU, bool IsTopNode) {
 
 /// Create a generic scheduler with no vreg liveness or DAG mutation passes.
 static ScheduleDAGInstrs *createGenericSchedPostRA(MachineSchedContext *C) {
-  return new ScheduleDAGMI(C, new PostGenericScheduler(C), /*IsPostRA=*/true);
+  return new ScheduleDAGMI(C, make_unique<PostGenericScheduler>(C), /*IsPostRA=*/true);
 }
 
 //===----------------------------------------------------------------------===//
@@ -3303,10 +3302,10 @@ public:
 } // namespace
 
 static ScheduleDAGInstrs *createILPMaxScheduler(MachineSchedContext *C) {
-  return new ScheduleDAGMILive(C, new ILPScheduler(true));
+  return new ScheduleDAGMILive(C, make_unique<ILPScheduler>(true));
 }
 static ScheduleDAGInstrs *createILPMinScheduler(MachineSchedContext *C) {
-  return new ScheduleDAGMILive(C, new ILPScheduler(false));
+  return new ScheduleDAGMILive(C, make_unique<ILPScheduler>(false));
 }
 static MachineSchedRegistry ILPMaxRegistry(
   "ilpmax", "Schedule bottom-up for max ILP", createILPMaxScheduler);
@@ -3395,7 +3394,7 @@ static ScheduleDAGInstrs *createInstructionShuffler(MachineSchedContext *C) {
   bool TopDown = !ForceBottomUp;
   assert((TopDown || !ForceTopDown) &&
          "-misched-topdown incompatible with -misched-bottomup");
-  return new ScheduleDAGMILive(C, new InstructionShuffler(Alternate, TopDown));
+  return new ScheduleDAGMILive(C, make_unique<InstructionShuffler>(Alternate, TopDown));
 }
 static MachineSchedRegistry ShufflerRegistry(
   "shuffle", "Shuffle machine instructions alternating directions",

lib/Target/Hexagon/HexagonMachineScheduler.h

@@ -93,8 +93,9 @@ VLIWResourceModel(const TargetMachine &TM, const TargetSchedModel *SM) :
 /// top-level schedule() driver.
 class VLIWMachineScheduler : public ScheduleDAGMILive {
 public:
-  VLIWMachineScheduler(MachineSchedContext *C, MachineSchedStrategy *S):
-    ScheduleDAGMILive(C, S) {}
+  VLIWMachineScheduler(MachineSchedContext *C,
+                       std::unique_ptr<MachineSchedStrategy> S)
+      : ScheduleDAGMILive(C, std::move(S)) {}
 
   /// Schedule - This is called back from ScheduleDAGInstrs::Run() when it's
   /// time to do some work.

lib/Target/Hexagon/HexagonTargetMachine.cpp

@@ -52,7 +52,7 @@ extern "C" void LLVMInitializeHexagonTarget() {
 }
 
 static ScheduleDAGInstrs *createVLIWMachineSched(MachineSchedContext *C) {
-  return new VLIWMachineScheduler(C, new ConvergingVLIWScheduler());
+  return new VLIWMachineScheduler(C, make_unique<ConvergingVLIWScheduler>());
 }
 
 static MachineSchedRegistry

lib/Target/R600/AMDGPUTargetMachine.cpp

@@ -42,7 +42,7 @@ extern "C" void LLVMInitializeR600Target() {
 }
 
 static ScheduleDAGInstrs *createR600MachineScheduler(MachineSchedContext *C) {
-  return new ScheduleDAGMILive(C, new R600SchedStrategy());
+  return new ScheduleDAGMILive(C, make_unique<R600SchedStrategy>());
 }
 
 static MachineSchedRegistry