[Mips] Use unique_ptr to manage ownership.

Required some tweaking of ValueMap to accommodate a move-only value
type. No functional change intended.

llvm-svn: 235091

llvm/include/llvm/IR/ValueMap.h

@@ -147,9 +147,14 @@ public:
   // If the key is already in the map, it returns false and doesn't update the
   // value.
   std::pair<iterator, bool> insert(const std::pair<KeyT, ValueT> &KV) {
-    std::pair<typename MapT::iterator, bool> map_result=
-      Map.insert(std::make_pair(Wrap(KV.first), KV.second));
-    return std::make_pair(iterator(map_result.first), map_result.second);
+    auto MapResult = Map.insert(std::make_pair(Wrap(KV.first), KV.second));
+    return std::make_pair(iterator(MapResult.first), MapResult.second);
+  }
+
+  std::pair<iterator, bool> insert(std::pair<KeyT, ValueT> &&KV) {
+    auto MapResult =
+        Map.insert(std::make_pair(Wrap(KV.first), std::move(KV.second)));
+    return std::make_pair(iterator(MapResult.first), MapResult.second);
   }
 
   /// insert - Range insertion of pairs.
@@ -256,9 +261,9 @@ public:
       // I could == Copy.Map->Map.end() if the onRAUW callback already
       // removed the old mapping.
       if (I != Copy.Map->Map.end()) {
-        ValueT Target(I->second);
+        ValueT Target(std::move(I->second));
         Copy.Map->Map.erase(I);  // Definitely destroys *this.
-        Copy.Map->insert(std::make_pair(typed_new_key, Target));
+        Copy.Map->insert(std::make_pair(typed_new_key, std::move(Target)));
       }
     }
   }

llvm/lib/Target/Mips/MipsMachineFunction.cpp

@@ -60,15 +60,7 @@ void MipsCallEntry::printCustom(raw_ostream &O) const {
 #endif
 }
 
-MipsFunctionInfo::~MipsFunctionInfo() {
-  for (StringMap<const MipsCallEntry *>::iterator
-       I = ExternalCallEntries.begin(), E = ExternalCallEntries.end(); I != E;
-       ++I)
-    delete I->getValue();
-
-  for (const auto &Entry : GlobalCallEntries)
-    delete Entry.second;
-}
+MipsFunctionInfo::~MipsFunctionInfo() {}
 
 bool MipsFunctionInfo::globalBaseRegSet() const {
   return GlobalBaseReg;
@@ -125,21 +117,21 @@ bool MipsFunctionInfo::isEhDataRegFI(int FI) const {
 }
 
 MachinePointerInfo MipsFunctionInfo::callPtrInfo(StringRef Name) {
-  const MipsCallEntry *&E = ExternalCallEntries[Name];
+  std::unique_ptr<const MipsCallEntry> &E = ExternalCallEntries[Name];
 
   if (!E)
-    E = new MipsCallEntry(Name);
+    E = llvm::make_unique<MipsCallEntry>(Name);
 
-  return MachinePointerInfo(E);
+  return MachinePointerInfo(E.get());
 }
 
 MachinePointerInfo MipsFunctionInfo::callPtrInfo(const GlobalValue *Val) {
-  const MipsCallEntry *&E = GlobalCallEntries[Val];
+  std::unique_ptr<const MipsCallEntry> &E = GlobalCallEntries[Val];
 
   if (!E)
-    E = new MipsCallEntry(Val);
+    E = llvm::make_unique<MipsCallEntry>(Val);
 
-  return MachinePointerInfo(E);
+  return MachinePointerInfo(E.get());
 }
 
 int MipsFunctionInfo::getMoveF64ViaSpillFI(const TargetRegisterClass *RC) {

llvm/lib/Target/Mips/MipsMachineFunction.h

@@ -144,8 +144,9 @@ private:
   int MoveF64ViaSpillFI;
 
   /// MipsCallEntry maps.
-  StringMap<const MipsCallEntry *> ExternalCallEntries;
-  ValueMap<const GlobalValue *, const MipsCallEntry *> GlobalCallEntries;
+  StringMap<std::unique_ptr<const MipsCallEntry>> ExternalCallEntries;
+  ValueMap<const GlobalValue *, std::unique_ptr<const MipsCallEntry>>
+      GlobalCallEntries;
 };
 
 } // end of namespace llvm