tblgen: Move mini Type hierarchy to LLVM-style RTTI.

llvm-svn: 165648

1 files changed, 22 insertions, 4 deletions

diff --git a/llvm/utils/TableGen/TGValueTypes.cpp b/llvm/utils/TableGen/TGValueTypes.cpp
index af0d9f44cf4..07400cf7447 100644
--- a/llvm/utils/TableGen/TGValueTypes.cpp
+++ b/llvm/utils/TableGen/TGValueTypes.cpp
@@ -15,13 +15,25 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/CodeGen/ValueTypes.h"
+#include "llvm/Support/Casting.h"
 #include <map>
 using namespace llvm;
 
 namespace llvm {
 
 class Type {
+protected:
+  enum TypeKind {
+    TK_ExtendedIntegerType,
+    TK_ExtendedVectorType
+  };
+private:
+  TypeKind Kind;
 public:
+  TypeKind getKind() const {
+    return Kind;
+  }
+  Type(TypeKind K) : Kind(K) {}
   virtual unsigned getSizeInBits() const = 0;
   virtual ~Type() {}
 };
@@ -32,7 +44,10 @@ class ExtendedIntegerType : public Type {
   unsigned BitWidth;
 public:
   explicit ExtendedIntegerType(unsigned bits)
-    : BitWidth(bits) {}
+    : Type(TK_ExtendedIntegerType), BitWidth(bits) {}
+  static bool classof(const Type *T) {
+    return T->getKind() == TK_ExtendedIntegerType;
+  };
   unsigned getSizeInBits() const {
     return getBitWidth();
   }
@@ -46,7 +61,10 @@ class ExtendedVectorType : public Type {
   unsigned NumElements;
 public:
   ExtendedVectorType(EVT elty, unsigned num)
-    : ElementType(elty), NumElements(num) {}
+    : Type(TK_ExtendedVectorType), ElementType(elty), NumElements(num) {}
+  static bool classof(const Type *T) {
+    return T->getKind() == TK_ExtendedVectorType;
+  };
   unsigned getSizeInBits() const {
     return getNumElements() * getElementType().getSizeInBits();
   }
@@ -71,12 +89,12 @@ bool EVT::isExtendedFloatingPoint() const {
 
 bool EVT::isExtendedInteger() const {
   assert(isExtended() && "Type is not extended!");
-  return dynamic_cast<const ExtendedIntegerType *>(LLVMTy) != 0;
+  return isa<ExtendedIntegerType>(LLVMTy);
 }
 
 bool EVT::isExtendedVector() const {
   assert(isExtended() && "Type is not extended!");
-  return dynamic_cast<const ExtendedVectorType *>(LLVMTy) != 0;
+  return isa<ExtendedVectorType>(LLVMTy);
 }
 
 bool EVT::isExtended64BitVector() const {