#ifndef LLVM_SUPPORT_VALUEHANDLE_H
#define LLVM_SUPPORT_VALUEHANDLE_H
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/Value.h"
namespace llvm {
class ValueHandleBase;
template<>
class PointerLikeTypeTraits<ValueHandleBase**> {
public:
static inline void *getAsVoidPointer(ValueHandleBase** P) { return P; }
static inline ValueHandleBase **getFromVoidPointer(void *P) {
return static_cast<ValueHandleBase**>(P);
}
enum { NumLowBitsAvailable = 2 };
};
class ValueHandleBase {
friend class Value;
protected:
enum HandleBaseKind {
Assert,
Weak,
Callback
};
private:
PointerIntPair<ValueHandleBase**, 2, HandleBaseKind> PrevPair;
ValueHandleBase *Next;
Value *VP;
public:
ValueHandleBase(HandleBaseKind Kind) : PrevPair(0, Kind), Next(0), VP(0) {}
ValueHandleBase(HandleBaseKind Kind, Value *V)
: PrevPair(0, Kind), Next(0), VP(V) {
if (V)
AddToUseList();
}
ValueHandleBase(HandleBaseKind Kind, const ValueHandleBase &RHS)
: PrevPair(0, Kind), Next(0), VP(RHS.VP) {
if (VP)
AddToExistingUseList(RHS.getPrevPtr());
}
~ValueHandleBase() {
if (VP)
RemoveFromUseList();
}
Value *operator=(Value *RHS) {
if (VP == RHS) return RHS;
if (VP) RemoveFromUseList();
VP = RHS;
if (VP) AddToUseList();
return RHS;
}
Value *operator=(const ValueHandleBase &RHS) {
if (VP == RHS.VP) return RHS.VP;
if (VP) RemoveFromUseList();
VP = RHS.VP;
if (VP) AddToExistingUseList(RHS.getPrevPtr());
return VP;
}
Value *operator->() const { return getValPtr(); }
Value &operator*() const { return *getValPtr(); }
bool operator==(const Value *RHS) const { return VP == RHS; }
bool operator==(const ValueHandleBase &RHS) const { return VP == RHS.VP; }
bool operator!=(const Value *RHS) const { return VP != RHS; }
bool operator!=(const ValueHandleBase &RHS) const { return VP != RHS.VP; }
bool operator<(const Value *RHS) const { return VP < RHS; }
bool operator<(const ValueHandleBase &RHS) const { return VP < RHS.VP; }
bool operator>(const Value *RHS) const { return VP > RHS; }
bool operator>(const ValueHandleBase &RHS) const { return VP > RHS.VP; }
bool operator<=(const Value *RHS) const { return VP <= RHS; }
bool operator<=(const ValueHandleBase &RHS) const { return VP <= RHS.VP; }
bool operator>=(const Value *RHS) const { return VP >= RHS; }
bool operator>=(const ValueHandleBase &RHS) const { return VP >= RHS.VP; }
protected:
Value *getValPtr() const { return VP; }
private:
static void ValueIsDeleted(Value *V);
static void ValueIsRAUWd(Value *Old, Value *New);
ValueHandleBase **getPrevPtr() const { return PrevPair.getPointer(); }
HandleBaseKind getKind() const { return PrevPair.getInt(); }
void setPrevPtr(ValueHandleBase **Ptr) { PrevPair.setPointer(Ptr); }
void AddToExistingUseList(ValueHandleBase **List);
void AddToUseList();
void RemoveFromUseList();
};
class WeakVH : public ValueHandleBase {
public:
WeakVH() : ValueHandleBase(Weak) {}
WeakVH(Value *P) : ValueHandleBase(Weak, P) {}
WeakVH(const WeakVH &RHS)
: ValueHandleBase(Weak, RHS) {}
operator Value*() const {
return getValPtr();
}
};
template <typename ValueTy>
class AssertingVH
#ifndef NDEBUG
: public ValueHandleBase
#endif
{
#ifndef NDEBUG
ValueTy *getValPtr() const {
return static_cast<ValueTy*>(ValueHandleBase::getValPtr());
}
void setValPtr(ValueTy *P) {
ValueHandleBase::operator=(P);
}
#else
ValueTy *ThePtr;
ValueTy *getValPtr() const { return ThePtr; }
void setValPtr(ValueTy *P) { ThePtr = P; }
#endif
public:
#ifndef NDEBUG
AssertingVH() : ValueHandleBase(Assert) {}
AssertingVH(ValueTy *P) : ValueHandleBase(Assert, P) {}
AssertingVH(const AssertingVH &RHS) : ValueHandleBase(Assert, RHS) {}
#else
AssertingVH() : ThePtr(0) {}
AssertingVH(ValueTy *P) : ThePtr(P) {}
#endif
operator ValueTy*() const {
return getValPtr();
}
ValueTy *operator=(ValueTy *RHS) {
setValPtr(RHS);
return getValPtr();
}
ValueTy *operator=(AssertingVH<ValueTy> &RHS) {
setValPtr(RHS.getValPtr());
return getValPtr();
}
ValueTy *operator->() const { return getValPtr(); }
ValueTy &operator*() const { return *getValPtr(); }
bool operator==(const Value *RHS) const { return getValPtr() == RHS; }
bool operator!=(const Value *RHS) const { return getValPtr() != RHS; }
bool operator<(const Value *RHS) const { return getValPtr() < RHS; }
bool operator>(const Value *RHS) const { return getValPtr() > RHS; }
bool operator<=(const Value *RHS) const { return getValPtr() <= RHS; }
bool operator>=(const Value *RHS) const { return getValPtr() >= RHS; }
bool operator==(const AssertingVH &RHS) const {
return getValPtr() == RHS.getValPtr();
}
bool operator!=(const AssertingVH &RHS) const {
return getValPtr() != RHS.getValPtr();
}
bool operator<(const AssertingVH &RHS) const {
return getValPtr() < RHS.getValPtr();
}
bool operator>(const AssertingVH &RHS) const {
return getValPtr() > RHS.getValPtr();
}
bool operator<=(const AssertingVH &RHS) const {
return getValPtr() <= RHS.getValPtr();
}
bool operator>=(const AssertingVH &RHS) const {
return getValPtr() >= RHS.getValPtr();
}
};
}
#endif