-//===-- 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
#define LLVM_USER_H
#include "llvm/Value.h"
-#include <vector>
+
+namespace llvm {
class User : public Value {
User(const User &); // Do not implement
protected:
- vector<Use> Operands;
+ /// 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() { dropAllReferences(); }
+ User(const Type *Ty, unsigned vty, Use *OpList, unsigned NumOps)
+ : Value(Ty, vty), OperandList(OpList), NumOperands(NumOps) {}
- inline Value *getOperand(unsigned i) {
- assert(i < Operands.size() && "getOperand() out of range!");
- return Operands[i];
- }
- inline const Value *getOperand(unsigned i) const {
- assert(i < Operands.size() && "getOperand() const out of range!");
- return Operands[i];
+ Value *getOperand(unsigned i) const {
+ assert(i < NumOperands && "getOperand() out of range!");
+ return OperandList[i];
}
- inline void setOperand(unsigned i, Value *Val) {
- assert(i < Operands.size() && "setOperand() out of range!");
- Operands[i] = Val;
+ void setOperand(unsigned i, Value *Val) {
+ assert(i < NumOperands && "setOperand() out of range!");
+ OperandList[i] = Val;
}
- inline unsigned getNumOperands() const { return Operands.size(); }
+ unsigned getNumOperands() const { return NumOperands; }
// ---------------------------------------------------------------------------
// Operand Iterator interface...
//
- typedef vector<Use>::iterator op_iterator;
- typedef vector<Use>::const_iterator op_const_iterator;
+ typedef Use* op_iterator;
+ typedef const Use* const_op_iterator;
- inline op_iterator op_begin() { return Operands.begin(); }
- inline op_const_iterator op_begin() const { return Operands.end(); }
- inline op_iterator op_end() { return Operands.end(); }
- inline op_const_iterator op_end() const { return Operands.end(); }
+ 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() {
- Operands.clear();
+ 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
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