Initial revision

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 47 insertions, 0 deletions

diff --git a/include/llvm/User.h b/include/llvm/User.h
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+++ b/include/llvm/User.h
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+//===-- llvm/User.h - User class definition ----------------------*- C++ -*--=//
+//
+// This class defines the interface that one who 'use's a Value must implement.
+// Each instance of the Value class keeps track of what User's have handles
+// to it.
+//
+//  * Instructions are the largest class of User's.
+//  * Constants may be users of other constants (think arrays and stuff)
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_USER_H
+#define LLVM_USER_H
+
+#include "llvm/Value.h"
+
+class User : public Value {
+  User(const User &);             // Do not implement
+public:
+  User(const Type *Ty, ValueTy vty, const string &name = "");
+  virtual ~User() {}
+
+  // if i > the number of operands, then getOperand() returns 0, and setOperand
+  // returns false.  setOperand() may also return false if the operand is of
+  // the wrong type.
+  //
+  virtual Value *getOperand(unsigned i) = 0;
+  virtual const Value *getOperand(unsigned i) const = 0;
+  virtual bool setOperand(unsigned i, Value *Val) = 0;
+
+  // dropAllReferences() - This virtual function should be overridden to "let
+  // go" of all references that this user is maintaining.  This allows one to 
+  // 'delete' a whole class at a time, even though there may be circular
+  // references... first all references are dropped, and all use counts go to
+  // zero.  Then everything is delete'd for real.  Note that no operations are
+  // valid on an object that has "dropped all references", except operator 
+  // delete.
+  //
+  virtual void dropAllReferences() = 0;
+
+  // replaceUsesOfWith - Replaces all references to the "From" definition with
+  // references to the "To" definition.  (defined in Value.cpp)
+  //
+  void replaceUsesOfWith(Value *From, Value *To);
+};
+
+#endif