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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:
std::vector<Use> Operands;
public:
User(const Type *Ty, unsigned vty, const std::string &name = "")
: Value(Ty, vty, name) {}
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];
}
inline void setOperand(unsigned i, Value *Val) {
assert(i < Operands.size() && "setOperand() out of range!");
Operands[i] = Val;
}
inline unsigned getNumOperands() const { return Operands.size(); }
// ---------------------------------------------------------------------------
// Operand Iterator interface...
//
typedef std::vector<Use>::iterator op_iterator;
typedef std::vector<Use>::const_iterator const_op_iterator;
void op_reserve(unsigned NumElements) { Operands.reserve(NumElements); }
inline op_iterator op_begin() { return Operands.begin(); }
inline const_op_iterator op_begin() const { return Operands.begin(); }
inline op_iterator op_end() { return Operands.end(); }
inline const_op_iterator op_end() const { return Operands.end(); }
/// op_erase - This method is used to remove one of the arguments from the
/// operands list. Only use this if you know what you are doing.
///
op_iterator op_erase(op_iterator I) { return Operands.erase(I); }
op_iterator op_erase(op_iterator I, op_iterator E) {
return Operands.erase(I, E);
}
// 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.
//
inline void dropAllReferences() {
Operands.clear();
}
/// 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> {};
} // End llvm namespace
#endif
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