--- /dev/null
+//===-- llvm/Support/ValueHolder.h - Wrapper for Value's --------*- C++ -*-===//
+//
+// This class defines a simple subclass of User, which keeps a pointer to a
+// Value, which automatically updates when Value::replaceAllUsesWith is called.
+// This is useful when you have pointers to Value's in your pass, but the
+// pointers get invalidated when some other portion of the algorithm is
+// replacing Values with other Values.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_VALUEHOLDER_H
+#define LLVM_SUPPORT_VALUEHOLDER_H
+
+#include "llvm/User.h"
+
+struct ValueHolder : public User {
+ ValueHolder(Value *V = 0);
+
+ // Getters...
+ const Value *get() const { return getOperand(0); }
+ operator const Value*() const { return getOperand(0); }
+ Value *get() { return getOperand(0); }
+ operator Value*() { return getOperand(0); }
+
+ // Setters...
+ const ValueHolder &operator=(Value *V) {
+ setOperand(0, V);
+ return *this;
+ }
+
+ virtual void print(std::ostream& OS) const {
+ OS << "ValueHolder";
+ }
+};
+
+#endif