template <class>
struct OperandTraits;
-class User;
-
-/// OperandTraits<User> - specialization to User
-template <>
-struct OperandTraits<User> {
- static inline Use *op_begin(User*);
- static inline Use *op_end(User*);
- static inline unsigned operands(const User*);
- template <class U>
- struct Layout {
- typedef U overlay;
- };
- static inline void *allocate(unsigned);
-};
-
class User : public Value {
User(const User &); // Do not implement
void *operator new(size_t); // Do not implement
User(const Type *ty, unsigned vty, Use *OpList, unsigned NumOps)
: Value(ty, vty), OperandList(OpList), NumOperands(NumOps) {}
Use *allocHungoffUses(unsigned) const;
- void dropHungoffUses(Use *U) {
- if (OperandList == U) {
- OperandList = 0;
- NumOperands = 0;
- }
- Use::zap(U, U->getImpliedUser(), true);
+ void dropHungoffUses() {
+ Use::zap(OperandList, OperandList + NumOperands, true);
+ OperandList = 0;
+ // Reset NumOperands so User::operator delete() does the right thing.
+ NumOperands = 0;
}
public:
~User() {
void operator delete(void*, unsigned) {
assert(0 && "Constructor throws?");
}
- template <unsigned Idx> Use &Op() {
- return OperandTraits<User>::op_begin(this)[Idx];
+ /// placement delete - required by std, but never called.
+ void operator delete(void*, unsigned, bool) {
+ assert(0 && "Constructor throws?");
+ }
+protected:
+ template <int Idx, typename U> static Use &OpFrom(const U *that) {
+ return Idx < 0
+ ? OperandTraits<U>::op_end(const_cast<U*>(that))[Idx]
+ : OperandTraits<U>::op_begin(const_cast<U*>(that))[Idx];
+ }
+ template <int Idx> Use &Op() {
+ return OpFrom<Idx>(this);
}
- template <unsigned Idx> const Use &Op() const {
- return OperandTraits<User>::op_begin(const_cast<User*>(this))[Idx];
+ template <int Idx> const Use &Op() const {
+ return OpFrom<Idx>(this);
}
+public:
Value *getOperand(unsigned i) const {
assert(i < NumOperands && "getOperand() out of range!");
return OperandList[i];
}
};
-inline Use *OperandTraits<User>::op_begin(User *U) {
- return U->op_begin();
-}
-
-inline Use *OperandTraits<User>::op_end(User *U) {
- return U->op_end();
-}
-
-inline unsigned OperandTraits<User>::operands(const User *U) {
- return U->getNumOperands();
-}
-
template<> struct simplify_type<User::op_iterator> {
typedef Value* SimpleType;