unique_ptrify the value in DominatorTreeBase::DomTreeNodes

(noticed the need for an explicit dtor in a recent commit & figured I'd
tidy that up)

llvm-svn: 226028

Author: dwblaikie

llvm/include/llvm/Support/GenericDomTree.h

@@ -93,8 +93,9 @@ template <class NodeT> class DomTreeNodeBase {
   DomTreeNodeBase(NodeT *BB, DomTreeNodeBase<NodeT> *iDom)
       : TheBB(BB), IDom(iDom), DFSNumIn(-1), DFSNumOut(-1) {}
 
-  DomTreeNodeBase<NodeT> *addChild(DomTreeNodeBase<NodeT> *C) {
-    Children.push_back(C);
+  std::unique_ptr<DomTreeNodeBase<NodeT>>
+  addChild(std::unique_ptr<DomTreeNodeBase<NodeT>> C) {
+    Children.push_back(C.get());
     return C;
   }
 
@@ -210,7 +211,8 @@ template <class NodeT> class DominatorTreeBase : public DominatorBase<NodeT> {
   }
 
 protected:
-  typedef DenseMap<NodeT *, DomTreeNodeBase<NodeT> *> DomTreeNodeMapType;
+  typedef DenseMap<NodeT *, std::unique_ptr<DomTreeNodeBase<NodeT>>>
+      DomTreeNodeMapType;
   DomTreeNodeMapType DomTreeNodes;
   DomTreeNodeBase<NodeT> *RootNode;
 
@@ -235,10 +237,6 @@ template <class NodeT> class DominatorTreeBase : public DominatorBase<NodeT> {
   DenseMap<NodeT *, InfoRec> Info;
 
   void reset() {
-    for (typename DomTreeNodeMapType::iterator I = this->DomTreeNodes.begin(),
-                                               E = DomTreeNodes.end();
-         I != E; ++I)
-      delete I->second;
     DomTreeNodes.clear();
     IDoms.clear();
     this->Roots.clear();
@@ -314,7 +312,6 @@ template <class NodeT> class DominatorTreeBase : public DominatorBase<NodeT> {
 public:
   explicit DominatorTreeBase(bool isPostDom)
       : DominatorBase<NodeT>(isPostDom), DFSInfoValid(false), SlowQueries(0) {}
-  ~DominatorTreeBase() { reset(); }
 
   DominatorTreeBase(DominatorTreeBase &&Arg)
       : DominatorBase<NodeT>(
@@ -358,10 +355,10 @@ template <class NodeT> class DominatorTreeBase : public DominatorBase<NodeT> {
       if (OI == OtherDomTreeNodes.end())
         return true;
 
-      DomTreeNodeBase<NodeT> *MyNd = I->second;
-      DomTreeNodeBase<NodeT> *OtherNd = OI->second;
+      DomTreeNodeBase<NodeT> &MyNd = *I->second;
+      DomTreeNodeBase<NodeT> &OtherNd = *OI->second;
 
-      if (MyNd->compare(OtherNd))
+      if (MyNd.compare(&OtherNd))
         return true;
     }
 
@@ -374,7 +371,10 @@ template <class NodeT> class DominatorTreeBase : public DominatorBase<NodeT> {
   /// block.  This is the same as using operator[] on this class.
   ///
   DomTreeNodeBase<NodeT> *getNode(NodeT *BB) const {
-    return DomTreeNodes.lookup(BB);
+    auto I = DomTreeNodes.find(BB);
+    if (I != DomTreeNodes.end())
+      return I->second.get();
+    return nullptr;
   }
 
   DomTreeNodeBase<NodeT> *operator[](NodeT *BB) const { return getNode(BB); }
@@ -555,8 +555,8 @@ template <class NodeT> class DominatorTreeBase : public DominatorBase<NodeT> {
     DomTreeNodeBase<NodeT> *IDomNode = getNode(DomBB);
     assert(IDomNode && "Not immediate dominator specified for block!");
     DFSInfoValid = false;
-    return DomTreeNodes[BB] =
-               IDomNode->addChild(new DomTreeNodeBase<NodeT>(BB, IDomNode));
+    return (DomTreeNodes[BB] = IDomNode->addChild(
+                llvm::make_unique<DomTreeNodeBase<NodeT>>(BB, IDomNode))).get();
   }
 
   /// changeImmediateDominator - This method is used to update the dominator
@@ -593,15 +593,6 @@ template <class NodeT> class DominatorTreeBase : public DominatorBase<NodeT> {
     }
 
     DomTreeNodes.erase(BB);
-    delete Node;
-  }
-
-  /// removeNode - Removes a node from the dominator tree.  Block must not
-  /// dominate any other blocks.  Invalidates any node pointing to removed
-  /// block.
-  void removeNode(NodeT *BB) {
-    assert(getNode(BB) && "Removing node that isn't in dominator tree.");
-    DomTreeNodes.erase(BB);
   }
 
   /// splitBlock - BB is split and now it has one successor. Update dominator
@@ -703,8 +694,8 @@ template <class NodeT> class DominatorTreeBase : public DominatorBase<NodeT> {
 
     // Add a new tree node for this NodeT, and link it as a child of
     // IDomNode
-    DomTreeNodeBase<NodeT> *C = new DomTreeNodeBase<NodeT>(BB, IDomNode);
-    return this->DomTreeNodes[BB] = IDomNode->addChild(C);
+    return (this->DomTreeNodes[BB] = IDomNode->addChild(
+                llvm::make_unique<DomTreeNodeBase<NodeT>>(BB, IDomNode))).get();
   }
 
   NodeT *getIDom(NodeT *BB) const { return IDoms.lookup(BB); }

llvm/include/llvm/Support/GenericDomTreeConstruction.h

@@ -251,15 +251,17 @@ void Calculate(DominatorTreeBase<typename GraphTraits<NodeT>::NodeType>& DT,
   // an infinite loop.
   typename GraphT::NodeType* Root = !MultipleRoots ? DT.Roots[0] : nullptr;
 
-  DT.DomTreeNodes[Root] = DT.RootNode =
-                  new DomTreeNodeBase<typename GraphT::NodeType>(Root, nullptr);
+  DT.RootNode =
+      (DT.DomTreeNodes[Root] =
+           llvm::make_unique<DomTreeNodeBase<typename GraphT::NodeType>>(
+               Root, nullptr)).get();
 
   // Loop over all of the reachable blocks in the function...
   for (unsigned i = 2; i <= N; ++i) {
     typename GraphT::NodeType* W = DT.Vertex[i];
 
-    DomTreeNodeBase<typename GraphT::NodeType> *BBNode = DT.DomTreeNodes[W];
-    if (BBNode) continue;  // Haven't calculated this node yet?
+    if (DT.DomTreeNodes[W])
+      continue; // Haven't calculated this node yet?
 
     typename GraphT::NodeType* ImmDom = DT.getIDom(W);
 
@@ -271,15 +273,16 @@ void Calculate(DominatorTreeBase<typename GraphTraits<NodeT>::NodeType>& DT,
 
     // Add a new tree node for this BasicBlock, and link it as a child of
     // IDomNode
-    DomTreeNodeBase<typename GraphT::NodeType> *C =
-                    new DomTreeNodeBase<typename GraphT::NodeType>(W, IDomNode);
-    DT.DomTreeNodes[W] = IDomNode->addChild(C);
+    DT.DomTreeNodes[W] = IDomNode->addChild(
+        llvm::make_unique<DomTreeNodeBase<typename GraphT::NodeType>>(
+            W, IDomNode));
   }
 
   // Free temporary memory used to construct idom's
   DT.IDoms.clear();
   DT.Info.clear();
-  std::vector<typename GraphT::NodeType*>().swap(DT.Vertex);
+  DT.Vertex.clear();
+  DT.Vertex.shrink_to_fit();
 
   DT.updateDFSNumbers();
 }