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//===-- 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
// 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"
#include <vector>
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, unsigned vty, Use *OpList, unsigned NumOps,
const std::string &name = "")
: Value(Ty, vty, name), 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; }
// ---------------------------------------------------------------------------
// Operand Iterator interface...
//
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 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
// delete.
//
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.
///
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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