Derive NamedMDNode from Value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93032 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Metadata.h

@@ -31,7 +31,7 @@ template<typename ValueSubClass, typename ItemParentClass>
   
   
 //===----------------------------------------------------------------------===//
-// MetadataBase  - A base class for MDNode, MDString and NamedMDNode.
+// MetadataBase  - A base class for MDNode and MDString.
 class MetadataBase : public Value {
 protected:
   MetadataBase(const Type *Ty, unsigned scid)
@@ -42,8 +42,7 @@ public:
   /// Methods for support type inquiry through isa, cast, and dyn_cast:
   static inline bool classof(const MetadataBase *) { return true; }
   static bool classof(const Value *V) {
-    return V->getValueID() == MDStringVal || V->getValueID() == MDNodeVal
+    return V->getValueID() == MDStringVal || V->getValueID() == MDNodeVal;
-      || V->getValueID() == NamedMDNodeVal;
   }
 };
 
@@ -169,7 +168,7 @@ private:
 //===----------------------------------------------------------------------===//
 /// NamedMDNode - a tuple of MDNodes.
 /// NamedMDNode is always named. All NamedMDNode operand has a type of metadata.
-class NamedMDNode : public MetadataBase, public ilist_node<NamedMDNode> {
+class NamedMDNode : public Value, public ilist_node<NamedMDNode> {
   friend class SymbolTableListTraits<NamedMDNode, Module>;
   friend class LLVMContextImpl;
 

lib/Bitcode/Writer/ValueEnumerator.cpp

@@ -135,7 +135,7 @@ void ValueEnumerator::setInstructionID(const Instruction *I) {
 }
 
 unsigned ValueEnumerator::getValueID(const Value *V) const {
-  if (isa<MetadataBase>(V)) {
+  if (isa<MetadataBase>(V) || isa<NamedMDNode>(V)) {
     ValueMapType::const_iterator I = MDValueMap.find(V);
     assert(I != MDValueMap.end() && "Value not in slotcalculator!");
     return I->second-1;
@@ -205,6 +205,25 @@ void ValueEnumerator::EnumerateMDSymbolTable(const MDSymbolTable &MST) {
     EnumerateValue(MI->getValue());
 }
 
+void ValueEnumerator::EnumerateNamedMDNode(const NamedMDNode *MD) {
+  // Check to see if it's already in!
+  unsigned &MDValueID = MDValueMap[MD];
+  if (MDValueID) {
+    // Increment use count.
+    MDValues[MDValueID-1].second++;
+    return;
+  }
+
+  // Enumerate the type of this value.
+  EnumerateType(MD->getType());
+
+  for (unsigned i = 0, e = MD->getNumOperands(); i != e; ++i)
+    if (MDNode *E = MD->getOperand(i))
+      EnumerateValue(E);
+  MDValues.push_back(std::make_pair(MD, 1U));
+  MDValueMap[MD] = Values.size();
+}
+
 void ValueEnumerator::EnumerateMetadata(const MetadataBase *MD) {
   // Check to see if it's already in!
   unsigned &MDValueID = MDValueMap[MD];
@@ -230,15 +249,6 @@ void ValueEnumerator::EnumerateMetadata(const MetadataBase *MD) {
     return;
   }
   
-  if (const NamedMDNode *N = dyn_cast<NamedMDNode>(MD)) {
-    for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
-      if (MDNode *E = N->getOperand(i))
-        EnumerateValue(E);
-    MDValues.push_back(std::make_pair(MD, 1U));
-    MDValueMap[MD] = Values.size();
-    return;
-  }
-
   // Add the value.
   assert(isa<MDString>(MD) && "Unknown metadata kind");
   MDValues.push_back(std::make_pair(MD, 1U));
@@ -249,6 +259,8 @@ void ValueEnumerator::EnumerateValue(const Value *V) {
   assert(!V->getType()->isVoidTy() && "Can't insert void values!");
   if (const MetadataBase *MB = dyn_cast<MetadataBase>(V))
     return EnumerateMetadata(MB);
+  else if (const NamedMDNode *NMD = dyn_cast<NamedMDNode>(V))
+    return EnumerateNamedMDNode(NMD);
 
   // Check to see if it's already in!
   unsigned &ValueID = ValueMap[V];

lib/Bitcode/Writer/ValueEnumerator.h

@@ -27,6 +27,7 @@ class BasicBlock;
 class Function;
 class Module;
 class MetadataBase;
+class NamedMDNode;
 class AttrListPtr;
 class TypeSymbolTable;
 class ValueSymbolTable;
@@ -127,6 +128,7 @@ private:
   void OptimizeConstants(unsigned CstStart, unsigned CstEnd);
     
   void EnumerateMetadata(const MetadataBase *MD);
+  void EnumerateNamedMDNode(const NamedMDNode *NMD);
   void EnumerateValue(const Value *V);
   void EnumerateType(const Type *T);
   void EnumerateOperandType(const Value *V);

lib/VMCore/Metadata.cpp

@@ -217,7 +217,7 @@ static SmallVector<WeakVH, 4> &getNMDOps(void *Operands) {
 NamedMDNode::NamedMDNode(LLVMContext &C, StringRef N,
                          MDNode *const *MDs, 
                          unsigned NumMDs, Module *ParentModule)
-  : MetadataBase(Type::getMetadataTy(C), Value::NamedMDNodeVal), Parent(0) {
+  : Value(Type::getMetadataTy(C), Value::NamedMDNodeVal), Parent(0) {
   setName(N);
   Operands = new SmallVector<WeakVH, 4>();