class Module;
class GlobalValue : public Constant {
- GlobalValue(const GlobalValue &); // do not implement
+ GlobalValue(const GlobalValue &) LLVM_DELETED_FUNCTION;
public:
/// @brief An enumeration for the kinds of linkage for global values.
enum LinkageTypes {
AvailableExternallyLinkage, ///< Available for inspection, not emission.
LinkOnceAnyLinkage, ///< Keep one copy of function when linking (inline)
LinkOnceODRLinkage, ///< Same, but only replaced by something equivalent.
+ LinkOnceODRAutoHideLinkage, ///< Like LinkOnceODRLinkage but addr not taken.
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
};
protected:
- GlobalValue(const Type *ty, ValueTy vty, Use *Ops, unsigned NumOps,
+ GlobalValue(Type *ty, ValueTy vty, Use *Ops, unsigned NumOps,
LinkageTypes linkage, const Twine &Name)
- : Constant(ty, vty, Ops, NumOps), Parent(0),
- Linkage(linkage), Visibility(DefaultVisibility), Alignment(0) {
+ : Constant(ty, vty, Ops, NumOps), Linkage(linkage),
+ Visibility(DefaultVisibility), Alignment(0), UnnamedAddr(0), Parent(0) {
setName(Name);
}
- Module *Parent;
// Note: VC++ treats enums as signed, so an extra bit is required to prevent
// Linkage and Visibility from turning into negative values.
LinkageTypes Linkage : 5; // The linkage of this global
unsigned Visibility : 2; // The visibility style of this global
unsigned Alignment : 16; // Alignment of this symbol, must be power of two
+ unsigned UnnamedAddr : 1; // This value's address is not significant
+ Module *Parent; // The containing module.
std::string Section; // Section to emit this into, empty mean default
public:
~GlobalValue() {
removeDeadConstantUsers(); // remove any dead constants using this.
}
- unsigned getAlignment() const { return Alignment; }
- void setAlignment(unsigned Align) {
- assert((Align & (Align-1)) == 0 && "Alignment is not a power of 2!");
- Alignment = Align;
+ unsigned getAlignment() const {
+ return (1u << Alignment) >> 1;
}
+ void setAlignment(unsigned Align);
+
+ bool hasUnnamedAddr() const { return UnnamedAddr; }
+ void setUnnamedAddr(bool Val) { UnnamedAddr = Val; }
VisibilityTypes getVisibility() const { return VisibilityTypes(Visibility); }
bool hasDefaultVisibility() const { return Visibility == DefaultVisibility; }
bool use_empty_except_constants();
/// getType - Global values are always pointers.
- inline const PointerType *getType() const {
- return reinterpret_cast<const PointerType*>(User::getType());
+ inline PointerType *getType() const {
+ return reinterpret_cast<PointerType*>(User::getType());
}
static LinkageTypes getLinkOnceLinkage(bool ODR) {
return Linkage == AvailableExternallyLinkage;
}
static bool isLinkOnceLinkage(LinkageTypes Linkage) {
- return Linkage == LinkOnceAnyLinkage || Linkage == LinkOnceODRLinkage;
+ return Linkage == LinkOnceAnyLinkage ||
+ Linkage == LinkOnceODRLinkage ||
+ Linkage == LinkOnceODRAutoHideLinkage;
+ }
+ static bool isLinkOnceODRAutoHideLinkage(LinkageTypes Linkage) {
+ return Linkage == LinkOnceODRAutoHideLinkage;
}
static bool isWeakLinkage(LinkageTypes Linkage) {
return Linkage == WeakAnyLinkage || Linkage == WeakODRLinkage;
return Linkage == CommonLinkage;
}
+ /// isDiscardableIfUnused - Whether the definition of this global may be
+ /// discarded if it is not used in its compilation unit.
+ static bool isDiscardableIfUnused(LinkageTypes Linkage) {
+ return isLinkOnceLinkage(Linkage) || isLocalLinkage(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.
static bool mayBeOverridden(LinkageTypes Linkage) {
- return (Linkage == WeakAnyLinkage ||
- Linkage == LinkOnceAnyLinkage ||
- Linkage == CommonLinkage ||
- Linkage == ExternalWeakLinkage ||
- Linkage == LinkerPrivateWeakLinkage);
+ return Linkage == WeakAnyLinkage ||
+ Linkage == LinkOnceAnyLinkage ||
+ Linkage == CommonLinkage ||
+ Linkage == ExternalWeakLinkage ||
+ Linkage == LinkerPrivateWeakLinkage;
}
/// isWeakForLinker - Whether the definition of this global may be replaced at
- /// link time.
+ /// link time. NB: Using this method outside of the code generators is almost
+ /// always a mistake: when working at the IR level use mayBeOverridden instead
+ /// as it knows about ODR semantics.
static bool isWeakForLinker(LinkageTypes Linkage) {
- return (Linkage == AvailableExternallyLinkage ||
- Linkage == WeakAnyLinkage ||
- Linkage == WeakODRLinkage ||
- Linkage == LinkOnceAnyLinkage ||
- Linkage == LinkOnceODRLinkage ||
- Linkage == CommonLinkage ||
- Linkage == ExternalWeakLinkage ||
- Linkage == LinkerPrivateWeakLinkage);
+ return Linkage == AvailableExternallyLinkage ||
+ Linkage == WeakAnyLinkage ||
+ Linkage == WeakODRLinkage ||
+ Linkage == LinkOnceAnyLinkage ||
+ Linkage == LinkOnceODRLinkage ||
+ Linkage == LinkOnceODRAutoHideLinkage ||
+ Linkage == CommonLinkage ||
+ Linkage == ExternalWeakLinkage ||
+ Linkage == LinkerPrivateWeakLinkage;
}
bool hasExternalLinkage() const { return isExternalLinkage(Linkage); }
bool hasLinkOnceLinkage() const {
return isLinkOnceLinkage(Linkage);
}
+ bool hasLinkOnceODRAutoHideLinkage() const {
+ return isLinkOnceODRAutoHideLinkage(Linkage);
+ }
bool hasWeakLinkage() const {
return isWeakLinkage(Linkage);
}
void setLinkage(LinkageTypes LT) { Linkage = LT; }
LinkageTypes getLinkage() const { return Linkage; }
+ bool isDiscardableIfUnused() const {
+ return isDiscardableIfUnused(Linkage);
+ }
+
bool mayBeOverridden() const { return mayBeOverridden(Linkage); }
bool isWeakForLinker() const { return isWeakForLinker(Linkage); }
/// @}
- /// Override from Constant class. No GlobalValue's are null values so this
- /// always returns false.
- virtual bool isNullValue() const { return false; }
-
/// Override from Constant class.
virtual void destroyConstant();
/// isDeclaration - Return true if the primary definition of this global
- /// value is outside of the current translation unit...
- virtual bool isDeclaration() const = 0;
+ /// value is outside of the current translation unit.
+ bool isDeclaration() const;
/// removeFromParent - This method unlinks 'this' from the containing module,
/// but does not delete it.
inline Module *getParent() { return Parent; }
inline const Module *getParent() const { return Parent; }
- /// removeDeadConstantUsers - If there are any dead constant users dangling
- /// 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() const;
-
// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const GlobalValue *) { return true; }
static inline bool classof(const Value *V) {
return V->getValueID() == Value::FunctionVal ||
V->getValueID() == Value::GlobalVariableVal ||
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