Add a couple of virtual functions to support subclass ConstantExpr.

Note that a ConstantExpr can be of any type, so classof() in most
other subclasses (that discriminate by type) have to check that it
is also not a ConstantExpr.   This is why isConstantExpr() is needed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2890 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Constant.h b/include/llvm/Constant.h
index 572d1d15ca92761ed20796f9796a8585c2f43e9f..36a26d7f25c32b476ab4b5f1497e7091efbc33ed 100644 (file)
--- a/include/llvm/Constant.h
+++ b/include/llvm/Constant.h
@@ -37,11 +37,20 @@ public:
 
   virtual void print(std::ostream &O) const;
 
+  // isConstantExpr - Return true if this is a ConstantExpr
+  virtual bool isConstantExpr() const { return false; }
+  
   // Methods for support type inquiry through isa, cast, and dyn_cast:
   static inline bool classof(const Constant *) { return true; }
   static inline bool classof(const Value *V) {
     return V->getValueType() == Value::ConstantVal;
   }
+
+  // WARNING: Only to be used by Bytecode & Assembly Parsers!  USER CODE SHOULD
+  // NOT USE THIS!!
+  // Returns the number of uses of OldV that were replaced.
+  virtual unsigned mutateReferences(Value* OldV, Value *NewV) { return 0; }
+  // END WARNING!!
 };
 
 #endif