[Debug Info] add a template class DITypedArray.

Typedef DIArray to DITypedArray<DIDescriptor>. Also typedef DITypeArray as
DITypedArray<DITypeRef>.

This is the third of a series of patches to handle type uniqueing of the
type array for a subroutine type.

This commit should have no functionality change.

llvm-svn: 214115

include/llvm/IR/DIBuilder.h

@@ -38,7 +38,6 @@ namespace llvm {
   class DIFile;
   class DIEnumerator;
   class DIType;
-  class DIArray;
   class DIGlobalVariable;
   class DIImportedEntity;
   class DINameSpace;
@@ -470,6 +469,9 @@ namespace llvm {
     /// getOrCreateArray - Get a DIArray, create one if required.
     DIArray getOrCreateArray(ArrayRef<Value *> Elements);
 
+    /// getOrCreateTypeArray - Get a DITypeArray, create one if required.
+    DITypeArray getOrCreateTypeArray(ArrayRef<Value *> Elements);
+
     /// getOrCreateSubrange - Create a descriptor for a value range.  This
     /// implicitly uniques the values returned.
     DISubrange getOrCreateSubrange(int64_t Lo, int64_t Count);

include/llvm/IR/DebugInfo.h

@@ -167,17 +167,20 @@ public:
   bool Verify() const;
 };
 
-/// DIArray - This descriptor holds an array of descriptors.
-class DIArray : public DIDescriptor {
+/// DITypedArray - This descriptor holds an array of nodes with type T.
+template <typename T> class DITypedArray : public DIDescriptor {
 public:
-  explicit DIArray(const MDNode *N = nullptr) : DIDescriptor(N) {}
-
-  unsigned getNumElements() const;
-  DIDescriptor getElement(unsigned Idx) const {
-    return getDescriptorField(Idx);
+  explicit DITypedArray(const MDNode *N = nullptr) : DIDescriptor(N) {}
+  unsigned getNumElements() const {
+    return DbgNode ? DbgNode->getNumOperands() : 0;
+  }
+  T getElement(unsigned Idx) const {
+    return getFieldAs<T>(Idx);
   }
 };
 
+typedef DITypedArray<DIDescriptor> DIArray;
+
 /// DIEnumerator - A wrapper for an enumerator (e.g. X and Y in 'enum {X,Y}').
 /// FIXME: it seems strange that this doesn't have either a reference to the
 /// type/precision or a file/line pair for location info.
@@ -196,6 +199,7 @@ public:
 template <typename T> class DIRef;
 typedef DIRef<DIScope> DIScopeRef;
 typedef DIRef<DIType> DITypeRef;
+typedef DITypedArray<DITypeRef> DITypeArray;
 
 /// DIScope - A base class for various scopes.
 ///
@@ -421,12 +425,19 @@ public:
 class DICompositeType : public DIDerivedType {
   friend class DIDescriptor;
   void printInternal(raw_ostream &OS) const;
+  void setArraysHelper(MDNode *Elements, MDNode *TParams);
 
 public:
   explicit DICompositeType(const MDNode *N = nullptr) : DIDerivedType(N) {}
 
   DIArray getElements() const { return getFieldAs<DIArray>(10); }
-  void setArrays(DIArray Elements, DIArray TParams = DIArray());
+  template <typename T>
+  void setArrays(DITypedArray<T> Elements, DIArray TParams = DIArray()) {
+    assert((!TParams || DbgNode->getNumOperands() == 15) &&
+           "If you're setting the template parameters this should include a slot "
+           "for that!");
+    setArraysHelper(Elements, TParams);
+  }
   unsigned getRunTimeLang() const { return getUnsignedField(11); }
   DITypeRef getContainingType() const { return getFieldAs<DITypeRef>(12); }
   void setContainingType(DICompositeType ContainingType);

lib/IR/DIBuilder.cpp

@@ -956,6 +956,18 @@ DIArray DIBuilder::getOrCreateArray(ArrayRef<Value *> Elements) {
   return DIArray(MDNode::get(VMContext, Elements));
 }
 
+/// getOrCreateTypeArray - Get a DITypeArray, create one if required.
+DITypeArray DIBuilder::getOrCreateTypeArray(ArrayRef<Value *> Elements) {
+  SmallVector<llvm::Value *, 16> Elts; 
+  for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
+    if (Elements[i] && isa<MDNode>(Elements[i]))
+      Elts.push_back(DIType(cast<MDNode>(Elements[i])).getRef());
+    else
+      Elts.push_back(Elements[i]);
+  }
+  return DITypeArray(MDNode::get(VMContext, Elts));
+}
+
 /// getOrCreateSubrange - Create a descriptor for a value range.  This
 /// implicitly uniques the values returned.
 DISubrange DIBuilder::getOrCreateSubrange(int64_t Lo, int64_t Count) {

lib/IR/DebugInfo.cpp

@@ -338,12 +338,6 @@ bool DIDescriptor::isImportedEntity() const {
 // Simple Descriptor Constructors and other Methods
 //===----------------------------------------------------------------------===//
 
-unsigned DIArray::getNumElements() const {
-  if (!DbgNode)
-    return 0;
-  return DbgNode->getNumOperands();
-}
-
 /// replaceAllUsesWith - Replace all uses of the MDNode used by this
 /// type with the one in the passed descriptor.
 void DIType::replaceAllUsesWith(LLVMContext &VMContext, DIDescriptor D) {
@@ -676,10 +670,7 @@ static void VerifySubsetOf(const MDNode *LHS, const MDNode *RHS) {
 #endif
 
 /// \brief Set the array of member DITypes.
-void DICompositeType::setArrays(DIArray Elements, DIArray TParams) {
-  assert((!TParams || DbgNode->getNumOperands() == 15) &&
-         "If you're setting the template parameters this should include a slot "
-         "for that!");
+void DICompositeType::setArraysHelper(MDNode *Elements, MDNode *TParams) {
   TrackingVH<MDNode> N(*this);
   if (Elements) {
 #ifndef NDEBUG