DI: Remove DIDerivedTypeBase

Remove an unnecessary (and confusing) common subclass for
`DIDerivedType` and `DICompositeType`.  These classes aren't really
related, and even in the old debug info hierarchy, there was a
long-standing FIXME to separate them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243152 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/IR/DebugInfoMetadata.h

@@ -647,44 +647,20 @@ public:
   }
 };
 
-/// \brief Base class for DIDerivedType and DICompositeType.
-///
-/// TODO: Delete; they're not really related.
-class DIDerivedTypeBase : public DIType {
-protected:
-  DIDerivedTypeBase(LLVMContext &C, unsigned ID, StorageType Storage,
-                    unsigned Tag, unsigned Line, uint64_t SizeInBits,
-                    uint64_t AlignInBits, uint64_t OffsetInBits, unsigned Flags,
-                    ArrayRef<Metadata *> Ops)
-      : DIType(C, ID, Storage, Tag, Line, SizeInBits, AlignInBits, OffsetInBits,
-               Flags, Ops) {}
-  ~DIDerivedTypeBase() = default;
-
-public:
-  DITypeRef getBaseType() const { return DITypeRef(getRawBaseType()); }
-  Metadata *getRawBaseType() const { return getOperand(3); }
-
-  static bool classof(const Metadata *MD) {
-    return MD->getMetadataID() == DIDerivedTypeKind ||
-           MD->getMetadataID() == DICompositeTypeKind ||
-           MD->getMetadataID() == DISubroutineTypeKind;
-  }
-};
-
 /// \brief Derived types.
 ///
 /// This includes qualified types, pointers, references, friends, typedefs, and
 /// class members.
 ///
 /// TODO: Split out members (inheritance, fields, methods, etc.).
-class DIDerivedType : public DIDerivedTypeBase {
+class DIDerivedType : public DIType {
   friend class LLVMContextImpl;
   friend class MDNode;
 
   DIDerivedType(LLVMContext &C, StorageType Storage, unsigned Tag,
                 unsigned Line, uint64_t SizeInBits, uint64_t AlignInBits,
                 uint64_t OffsetInBits, unsigned Flags, ArrayRef<Metadata *> Ops)
-      : DIDerivedTypeBase(C, DIDerivedTypeKind, Storage, Tag, Line, SizeInBits,
+      : DIType(C, DIDerivedTypeKind, Storage, Tag, Line, SizeInBits,
                AlignInBits, OffsetInBits, Flags, Ops) {}
   ~DIDerivedType() = default;
 
@@ -733,6 +709,10 @@ public:
 
   TempDIDerivedType clone() const { return cloneImpl(); }
 
+  //// Get the base type this is derived from.
+  DITypeRef getBaseType() const { return DITypeRef(getRawBaseType()); }
+  Metadata *getRawBaseType() const { return getOperand(3); }
+
   /// \brief Get extra data associated with this derived type.
   ///
   /// Class type for pointer-to-members, objective-c property node for ivars,
@@ -768,7 +748,7 @@ public:
 /// \brief Base class for DICompositeType and DISubroutineType.
 ///
 /// TODO: Delete; they're not really related.
-class DICompositeTypeBase : public DIDerivedTypeBase {
+class DICompositeTypeBase : public DIType {
   unsigned RuntimeLang;
 
 protected:
@@ -777,12 +757,15 @@ protected:
                       uint64_t SizeInBits, uint64_t AlignInBits,
                       uint64_t OffsetInBits, unsigned Flags,
                       ArrayRef<Metadata *> Ops)
-      : DIDerivedTypeBase(C, ID, Storage, Tag, Line, SizeInBits, AlignInBits,
-                          OffsetInBits, Flags, Ops),
+      : DIType(C, ID, Storage, Tag, Line, SizeInBits, AlignInBits, OffsetInBits,
+               Flags, Ops),
         RuntimeLang(RuntimeLang) {}
   ~DICompositeTypeBase() = default;
 
 public:
+  //// Get the base type this is derived from, if any.
+  DITypeRef getBaseType() const { return DITypeRef(getRawBaseType()); }
+
   /// \brief Get the elements of the composite type.
   ///
   /// \note Calling this is only valid for \a DICompositeType.  This assertion
@@ -799,6 +782,7 @@ public:
   StringRef getIdentifier() const { return getStringOperand(7); }
   unsigned getRuntimeLang() const { return RuntimeLang; }
 
+  Metadata *getRawBaseType() const { return getOperand(3); }
   Metadata *getRawElements() const { return getOperand(4); }
   Metadata *getRawVTableHolder() const { return getOperand(5); }
   Metadata *getRawTemplateParams() const { return getOperand(6); }

include/llvm/IR/Metadata.def

@@ -69,7 +69,6 @@ HANDLE_SPECIALIZED_MDNODE_LEAF(DIEnumerator)
 HANDLE_SPECIALIZED_MDNODE_BRANCH(DIScope)
 HANDLE_SPECIALIZED_MDNODE_BRANCH(DIType)
 HANDLE_SPECIALIZED_MDNODE_LEAF(DIBasicType)
-HANDLE_SPECIALIZED_MDNODE_BRANCH(DIDerivedTypeBase)
 HANDLE_SPECIALIZED_MDNODE_LEAF(DIDerivedType)
 HANDLE_SPECIALIZED_MDNODE_BRANCH(DICompositeTypeBase)
 HANDLE_SPECIALIZED_MDNODE_LEAF(DICompositeType)

lib/IR/Verifier.cpp

@@ -302,7 +302,6 @@ private:
 #define HANDLE_SPECIALIZED_MDNODE_LEAF(CLASS) void visit##CLASS(const CLASS &N);
 #include "llvm/IR/Metadata.def"
   void visitDIScope(const DIScope &N);
-  void visitDIDerivedTypeBase(const DIDerivedTypeBase &N);
   void visitDIVariable(const DIVariable &N);
   void visitDILexicalBlockBase(const DILexicalBlockBase &N);
   void visitDITemplateParameter(const DITemplateParameter &N);
@@ -779,19 +778,10 @@ void Verifier::visitDIBasicType(const DIBasicType &N) {
          "invalid tag", &N);
 }
 
-void Verifier::visitDIDerivedTypeBase(const DIDerivedTypeBase &N) {
+void Verifier::visitDIDerivedType(const DIDerivedType &N) {
   // Common scope checks.
   visitDIScope(N);
 
-  Assert(isScopeRef(N, N.getScope()), "invalid scope", &N, N.getScope());
-  Assert(isTypeRef(N, N.getBaseType()), "invalid base type", &N,
-         N.getBaseType());
-}
-
-void Verifier::visitDIDerivedType(const DIDerivedType &N) {
-  // Common derived type checks.
-  visitDIDerivedTypeBase(N);
-
   Assert(N.getTag() == dwarf::DW_TAG_typedef ||
              N.getTag() == dwarf::DW_TAG_pointer_type ||
              N.getTag() == dwarf::DW_TAG_ptr_to_member_type ||
@@ -808,6 +798,10 @@ void Verifier::visitDIDerivedType(const DIDerivedType &N) {
     Assert(isTypeRef(N, N.getExtraData()), "invalid pointer to member type", &N,
            N.getExtraData());
   }
+
+  Assert(isScopeRef(N, N.getScope()), "invalid scope", &N, N.getScope());
+  Assert(isTypeRef(N, N.getBaseType()), "invalid base type", &N,
+         N.getBaseType());
 }
 
 static bool hasConflictingReferenceFlags(unsigned Flags) {
@@ -825,8 +819,8 @@ void Verifier::visitTemplateParams(const MDNode &N, const Metadata &RawParams) {
 }
 
 void Verifier::visitDICompositeType(const DICompositeType &N) {
-  // Common derived type checks.
-  visitDIDerivedTypeBase(N);
+  // Common scope checks.
+  visitDIScope(N);
 
   Assert(N.getTag() == dwarf::DW_TAG_array_type ||
              N.getTag() == dwarf::DW_TAG_structure_type ||
@@ -835,6 +829,10 @@ void Verifier::visitDICompositeType(const DICompositeType &N) {
              N.getTag() == dwarf::DW_TAG_class_type,
          "invalid tag", &N);
 
+  Assert(isScopeRef(N, N.getScope()), "invalid scope", &N, N.getScope());
+  Assert(isTypeRef(N, N.getBaseType()), "invalid base type", &N,
+         N.getBaseType());
+
   Assert(!N.getRawElements() || isa<MDTuple>(N.getRawElements()),
          "invalid composite elements", &N, N.getRawElements());
   Assert(isTypeRef(N, N.getRawVTableHolder()), "invalid vtable holder", &N,