/// @brief An enumeration for the kinds of linkage for global values.
enum LinkageTypes {
ExternalLinkage = 0,///< Externally visible function
- LinkOnceLinkage, ///< Keep one copy of function when linking (inline)
- WeakLinkage, ///< Keep one copy of named function when linking (weak)
+ AvailableExternallyLinkage, ///< Available for inspection, not emission.
+ LinkOnceAnyLinkage, ///< Keep one copy of function when linking (inline)
+ LinkOnceODRLinkage, ///< Same, but only replaced by something equivalent.
+ WeakAnyLinkage, ///< Keep one copy of named function when linking (weak)
+ WeakODRLinkage, ///< Same, but only replaced by something equivalent.
AppendingLinkage, ///< Special purpose, only applies to global arrays
- InternalLinkage, ///< Rename collisions when linking (static functions)
+ InternalLinkage, ///< Rename collisions when linking (static functions).
+ PrivateLinkage, ///< Like Internal, but omit from symbol table.
+ LinkerPrivateLinkage, ///< Like Private, but linker removes.
DLLImportLinkage, ///< Function to be imported from DLL
- DLLExportLinkage, ///< Function to be accessible from DLL
- ExternalWeakLinkage,///< ExternalWeak linkage description
- GhostLinkage, ///< Stand-in functions for streaming fns from BC files
- CommonLinkage ///< Tentative definitions
+ DLLExportLinkage, ///< Function to be accessible from DLL.
+ ExternalWeakLinkage,///< ExternalWeak linkage description.
+ GhostLinkage, ///< Stand-in functions for streaming fns from BC files.
+ CommonLinkage ///< Tentative definitions.
};
/// @brief An enumeration for the kinds of visibility of global values.
protected:
GlobalValue(const Type *ty, ValueTy vty, Use *Ops, unsigned NumOps,
- LinkageTypes linkage, const std::string &name = "")
+ LinkageTypes linkage, const Twine &Name)
: Constant(ty, vty, Ops, NumOps), Parent(0),
Linkage(linkage), Visibility(DefaultVisibility), Alignment(0) {
- if (!name.empty()) setName(name);
+ setName(Name);
}
Module *Parent;
}
VisibilityTypes getVisibility() const { return VisibilityTypes(Visibility); }
+ bool hasDefaultVisibility() const { return Visibility == DefaultVisibility; }
bool hasHiddenVisibility() const { return Visibility == HiddenVisibility; }
bool hasProtectedVisibility() const {
return Visibility == ProtectedVisibility;
bool hasSection() const { return !Section.empty(); }
const std::string &getSection() const { return Section; }
- void setSection(const std::string &S) { Section = S; }
+ void setSection(StringRef S) { Section = S; }
/// If the usage is empty (except transitively dead constants), then this
/// global value can can be safely deleted since the destructor will
return reinterpret_cast<const PointerType*>(User::getType());
}
- bool hasExternalLinkage() const { return Linkage == ExternalLinkage; }
- bool hasLinkOnceLinkage() const { return Linkage == LinkOnceLinkage; }
- bool hasWeakLinkage() const { return Linkage == WeakLinkage; }
- bool hasCommonLinkage() const { return Linkage == CommonLinkage; }
- bool hasAppendingLinkage() const { return Linkage == AppendingLinkage; }
- bool hasInternalLinkage() const { return Linkage == InternalLinkage; }
- bool hasDLLImportLinkage() const { return Linkage == DLLImportLinkage; }
- bool hasDLLExportLinkage() const { return Linkage == DLLExportLinkage; }
+ static LinkageTypes getLinkOnceLinkage(bool ODR) {
+ return ODR ? LinkOnceODRLinkage : LinkOnceAnyLinkage;
+ }
+ static LinkageTypes getWeakLinkage(bool ODR) {
+ return ODR ? WeakODRLinkage : WeakAnyLinkage;
+ }
+
+ bool hasExternalLinkage() const { return Linkage == ExternalLinkage; }
+ bool hasAvailableExternallyLinkage() const {
+ return Linkage == AvailableExternallyLinkage;
+ }
+ bool hasLinkOnceLinkage() const {
+ return Linkage == LinkOnceAnyLinkage || Linkage == LinkOnceODRLinkage;
+ }
+ bool hasWeakLinkage() const {
+ return Linkage == WeakAnyLinkage || Linkage == WeakODRLinkage;
+ }
+ bool hasAppendingLinkage() const { return Linkage == AppendingLinkage; }
+ bool hasInternalLinkage() const { return Linkage == InternalLinkage; }
+ bool hasPrivateLinkage() const { return Linkage == PrivateLinkage; }
+ bool hasLinkerPrivateLinkage() const { return Linkage==LinkerPrivateLinkage; }
+ bool hasLocalLinkage() const {
+ return hasInternalLinkage() || hasPrivateLinkage() ||
+ hasLinkerPrivateLinkage();
+ }
+ bool hasDLLImportLinkage() const { return Linkage == DLLImportLinkage; }
+ bool hasDLLExportLinkage() const { return Linkage == DLLExportLinkage; }
bool hasExternalWeakLinkage() const { return Linkage == ExternalWeakLinkage; }
+ bool hasGhostLinkage() const { return Linkage == GhostLinkage; }
+ bool hasCommonLinkage() const { return Linkage == CommonLinkage; }
+
void setLinkage(LinkageTypes LT) { Linkage = LT; }
LinkageTypes getLinkage() const { return Linkage; }
+ /// mayBeOverridden - Whether the definition of this global may be replaced
+ /// by something non-equivalent at link time. For example, if a function has
+ /// weak linkage then the code defining it may be replaced by different code.
+ bool mayBeOverridden() const {
+ return (Linkage == WeakAnyLinkage ||
+ Linkage == LinkOnceAnyLinkage ||
+ Linkage == CommonLinkage ||
+ Linkage == ExternalWeakLinkage);
+ }
+
+ /// isWeakForLinker - Whether the definition of this global may be replaced at
+ /// link time.
+ bool isWeakForLinker() const {
+ return (Linkage == AvailableExternallyLinkage ||
+ Linkage == WeakAnyLinkage ||
+ Linkage == WeakODRLinkage ||
+ Linkage == LinkOnceAnyLinkage ||
+ Linkage == LinkOnceODRLinkage ||
+ Linkage == CommonLinkage ||
+ Linkage == ExternalWeakLinkage);
+ }
+
/// copyAttributesFrom - copy all additional attributes (those not needed to
/// create a GlobalValue) from the GlobalValue Src to this one.
virtual void copyAttributesFrom(const GlobalValue *Src);
/// value is outside of the current translation unit...
virtual bool isDeclaration() const = 0;
+ /// removeFromParent - This method unlinks 'this' from the containing module,
+ /// but does not delete it.
+ virtual void removeFromParent() = 0;
+
+ /// eraseFromParent - This method unlinks 'this' from the containing module
+ /// and deletes it.
+ virtual void eraseFromParent() = 0;
+
/// getParent - Get the module that this global value is contained inside
/// of...
inline Module *getParent() { return Parent; }
/// off of this global value, 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();
+ void removeDeadConstantUsers() const;
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const GlobalValue *) { return true; }