class APInt;
template<typename T> class SmallVectorImpl;
- class LLVMContext;
/// This is an important base class in LLVM. It provides the common facilities
/// of all constant values in an LLVM program. A constant is a value that is
Constant(const Constant &); // Do not implement
protected:
- Constant(const Type *ty, ValueTy vty, Use *Ops, unsigned NumOps)
+ Constant(Type *ty, ValueTy vty, Use *Ops, unsigned NumOps)
: User(ty, vty, Ops, NumOps) {}
void destroyConstantImpl();
-
- void setOperand(unsigned i, Value *V) {
- User::setOperand(i, V);
- }
public:
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
- virtual bool isNullValue() const = 0;
+ bool isNullValue() const;
+
+ /// isAllOnesValue - Return true if this is the value that would be returned by
+ /// getAllOnesValue.
+ bool isAllOnesValue() const;
/// isNegativeZeroValue - Return true if the value is what would be returned
/// by getZeroValueForNegation.
- virtual bool isNegativeZeroValue() const { return isNullValue(); }
+ bool isNegativeZeroValue() const;
/// canTrap - Return true if evaluation of this constant could trap. This is
/// true for things like constant expressions that could divide by zero.
bool canTrap() const;
+ /// isConstantUsed - Return true if the constant has users other than constant
+ /// exprs and other dangling things.
+ bool isConstantUsed() const;
+
enum PossibleRelocationsTy {
NoRelocation = 0,
LocalRelocation = 1,
/// FIXME: This really should not be in VMCore.
PossibleRelocationsTy getRelocationInfo() const;
- // Specialize get/setOperand for Users as their operands are always
- // constants or BasicBlocks as well.
- User *getOperand(unsigned i) {
- return static_cast<User*>(User::getOperand(i));
- }
- const User *getOperand(unsigned i) const {
- return static_cast<const User*>(User::getOperand(i));
- }
-
/// getVectorElements - This method, which is only valid on constant of vector
/// type, returns the elements of the vector in the specified smallvector.
/// This handles breaking down a vector undef into undef elements, etc. For
/// constant exprs and other cases we can't handle, we return an empty vector.
- void getVectorElements(LLVMContext &Context,
- SmallVectorImpl<Constant*> &Elts) const;
+ void getVectorElements(SmallVectorImpl<Constant*> &Elts) const;
/// destroyConstant - Called if some element of this constant is no longer
/// valid. At this point only other constants may be on the use_list for this
assert(0 && "Constants that do not have operands cannot be using 'From'!");
}
- static Constant* getNullValue(const Type* Ty);
+ static Constant *getNullValue(Type* Ty);
/// @returns the value for an integer constant of the given type that has all
/// its bits set to true.
/// @brief Get the all ones value
- static Constant* getAllOnesValue(const Type* Ty);
+ static Constant *getAllOnesValue(Type* Ty);
/// getIntegerValue - Return the value for an integer or pointer constant,
/// or a vector thereof, with the given scalar value.
- static Constant* getIntegerValue(const Type* Ty, const APInt &V);
+ static Constant *getIntegerValue(Type* Ty, const APInt &V);
+
+ /// removeDeadConstantUsers - If there are any dead constant users dangling
+ /// off of this constant, remove them. This method is useful for clients
+ /// that want to check to see if a global is unused, but don't want to deal
+ /// with potentially dead constants hanging off of the globals.
+ void removeDeadConstantUsers() const;
};
} // End llvm namespace