namespace llvm {
template<typename T> class SmallVectorImpl;
+ class LLVMContext;
+ /// If object contains references to other objects, then relocations are
+ /// usually required for emission of such object (especially in PIC mode). One
+ /// usually distinguishes local and global relocations. Local relocations are
+ /// made wrt objects in the same module and these objects have local (internal
+ /// or private) linkage. Global relocations are made wrt externally visible
+ /// objects. In most cases local relocations can be resolved via so-called
+ /// 'pre-link' technique.
namespace Reloc {
+ const unsigned None = 0;
const unsigned Local = 1 << 0; ///< Local relocations are required
const unsigned Global = 1 << 1; ///< Global relocations are required
const unsigned LocalOrGlobal = Local | Global;
class Constant : public User {
void operator=(const Constant &); // Do not implement
Constant(const Constant &); // Do not implement
+
protected:
Constant(const Type *ty, ValueTy vty, Use *Ops, unsigned NumOps)
: User(ty, vty, Ops, NumOps) {}
void destroyConstantImpl();
public:
- /// Static constructor to get a '0' constant of arbitrary type...
- ///
- static Constant *getNullValue(const Type *Ty);
-
- /// Static constructor to get a '-1' constant. This supports integers and
- /// vectors.
- ///
- static Constant *getAllOnesValue(const Type *Ty);
-
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue.
virtual bool isNullValue() const = 0;
+ /// isNegativeZeroValue - Return true if the value is what would be returned
+ /// by getZeroValueForNegation.
+ virtual bool isNegativeZeroValue() const { return isNullValue(); }
+
/// 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;
/// ContainsRelocations - Return true if the constant value contains
- /// relocations which cannot be resolved at compile time.
+ /// relocations which cannot be resolved at compile time. Note that answer is
+ /// not exclusive: there can be possibility that relocations of other kind are
+ /// required as well.
bool ContainsRelocations(unsigned Kind = Reloc::LocalOrGlobal) const;
// Specialize get/setOperand for Constants as their operands are always
/// 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(SmallVectorImpl<Constant*> &Elts) const;
+ void getVectorElements(LLVMContext &Context,
+ 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