X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FUser.h;h=1ea5e189ba8263351d4e1ce99fd468b2855657ce;hb=1a957d563fe894c797e0eba00bf069fbe7ecba77;hp=58e0dec22bb9f50f0752932846392cf06dcbaa28;hpb=009505452b713ed2e3a8e99c5545a6e721c65495;p=oota-llvm.git

diff --git a/include/llvm/User.h b/include/llvm/User.h
index 58e0dec22bb..1ea5e189ba8 100644
--- a/include/llvm/User.h
+++ b/include/llvm/User.h
@@ -1,4 +1,11 @@
-//===-- llvm/User.h - User class definition ----------------------*- C++ -*--=//
+//===-- llvm/User.h - User class definition ---------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
 //
 // 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
@@ -14,34 +21,102 @@
 
 #include "llvm/Value.h"
 
+namespace llvm {
+
 class User : public Value {
   User(const User &);             // Do not implement
+protected:
+  /// OperandList - This is a pointer to the array of Users for this operand.
+  /// For nodes of fixed arity (e.g. a binary operator) this array will live
+  /// embedded into the derived class.  For nodes of variable arity
+  /// (e.g. ConstantArrays, CallInst, PHINodes, etc), this memory will be
+  /// dynamically allocated and should be destroyed by the classes virtual dtor.
+  Use *OperandList;
+
+  /// NumOperands - The number of values used by this User.
+  ///
+  unsigned NumOperands;
+
 public:
-  User(const Type *Ty, ValueTy vty, const string &name = "");
-  virtual ~User() {}
+  User(const Type *Ty, unsigned vty, Use *OpList, unsigned NumOps)
+    : Value(Ty, vty), OperandList(OpList), NumOperands(NumOps) {}
+
+  Value *getOperand(unsigned i) const {
+    assert(i < NumOperands && "getOperand() out of range!");
+    return OperandList[i];
+  }
+  void setOperand(unsigned i, Value *Val) {
+    assert(i < NumOperands && "setOperand() out of range!");
+    OperandList[i] = Val;
+  }
+  unsigned getNumOperands() const { return NumOperands; }
 
-  // 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.
+  // ---------------------------------------------------------------------------
+  // Operand Iterator interface...
   //
-  virtual Value *getOperand(unsigned i) = 0;
-  virtual const Value *getOperand(unsigned i) const = 0;
-  virtual bool setOperand(unsigned i, Value *Val) = 0;
+  typedef Use*       op_iterator;
+  typedef const Use* const_op_iterator;
+
+  inline op_iterator       op_begin()       { return OperandList; }
+  inline const_op_iterator op_begin() const { return OperandList; }
+  inline op_iterator       op_end()         { return OperandList+NumOperands; }
+  inline const_op_iterator op_end()   const { return OperandList+NumOperands; }
 
-  // dropAllReferences() - This virtual function should be overridden to "let
-  // go" of all references that this user is maintaining.  This allows one to 
+  // dropAllReferences() - This function is in charge of "letting go" of all
+  // objects that this User refers to.  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 
+  // valid on an object that has "dropped all references", except operator
   // delete.
   //
-  virtual void dropAllReferences() = 0;
+  void dropAllReferences() {
+    Use *OL = OperandList;
+    for (unsigned i = 0, e = NumOperands; i != e; ++i)
+      OL[i].set(0);
+  }
 
-  // replaceUsesOfWith - Replaces all references to the "From" definition with
-  // references to the "To" definition.  (defined in Value.cpp)
-  //
+  /// replaceUsesOfWith - Replaces all references to the "From" definition with
+  /// references to the "To" definition.
+  ///
   void replaceUsesOfWith(Value *From, Value *To);
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static inline bool classof(const User *) { return true; }
+  static inline bool classof(const Value *V) {
+    return isa<Instruction>(V) || isa<Constant>(V);
+  }
 };
 
+template<> struct simplify_type<User::op_iterator> {
+  typedef Value* SimpleType;
+
+  static SimpleType getSimplifiedValue(const User::op_iterator &Val) {
+    return static_cast<SimpleType>(Val->get());
+  }
+};
+
+template<> struct simplify_type<const User::op_iterator>
+  : public simplify_type<User::op_iterator> {};
+
+template<> struct simplify_type<User::const_op_iterator> {
+  typedef Value* SimpleType;
+
+  static SimpleType getSimplifiedValue(const User::const_op_iterator &Val) {
+    return static_cast<SimpleType>(Val->get());
+  }
+};
+
+template<> struct simplify_type<const User::const_op_iterator>
+  : public simplify_type<User::const_op_iterator> {};
+
+
+// value_use_iterator::getOperandNo - Requires the definition of the User class.
+template<typename UserTy>
+unsigned value_use_iterator<UserTy>::getOperandNo() const {
+  return U - U->getUser()->op_begin();
+}
+
+} // End llvm namespace
+
 #endif