/// @brief An enumeration for the kinds of linkage for global values.
enum LinkageTypes {
ExternalLinkage = 0,///< Externally visible function
+ 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)
- PrivateLinkage, ///< Like Internal, but omit from symbol table
+ 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
- ExternalWeakAnyLinkage,///< ExternalWeak linkage description
- ExternalWeakODRLinkage,///< Same, but only replaced by something equivalent.
- GhostLinkage, ///< Stand-in functions for streaming fns from BC files
- CommonAnyLinkage, ///< Tentative definitions
- CommonODRLinkage ///< Same, but only replaced by something equivalent.
+ DLLExportLinkage, ///< Function to be accessible from DLL.
+ ExternalWeakLinkage,///< ExternalWeak linkage description.
+ 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
static LinkageTypes getWeakLinkage(bool ODR) {
return ODR ? WeakODRLinkage : WeakAnyLinkage;
}
- static LinkageTypes getCommonLinkage(bool ODR) {
- return ODR ? CommonODRLinkage : CommonAnyLinkage;
- }
- static LinkageTypes getExternalWeakLinkage(bool ODR) {
- return ODR ? ExternalWeakODRLinkage : ExternalWeakAnyLinkage;
- }
bool hasExternalLinkage() const { return Linkage == ExternalLinkage; }
+ bool hasAvailableExternallyLinkage() const {
+ return Linkage == AvailableExternallyLinkage;
+ }
bool hasLinkOnceLinkage() const {
return Linkage == LinkOnceAnyLinkage || Linkage == LinkOnceODRLinkage;
}
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 Linkage == InternalLinkage || Linkage == PrivateLinkage;
+ return hasInternalLinkage() || hasPrivateLinkage() ||
+ hasLinkerPrivateLinkage();
}
bool hasDLLImportLinkage() const { return Linkage == DLLImportLinkage; }
bool hasDLLExportLinkage() const { return Linkage == DLLExportLinkage; }
- bool hasExternalWeakLinkage() const {
- return Linkage == ExternalWeakAnyLinkage ||
- Linkage == ExternalWeakODRLinkage;
- }
- bool hasGhostLinkage() const { return Linkage == GhostLinkage; }
- bool hasCommonLinkage() const {
- return Linkage == CommonAnyLinkage || Linkage == CommonODRLinkage;
- }
+ bool hasExternalWeakLinkage() const { return Linkage == ExternalWeakLinkage; }
+ bool hasCommonLinkage() const { return Linkage == CommonLinkage; }
void setLinkage(LinkageTypes LT) { Linkage = LT; }
LinkageTypes getLinkage() const { return Linkage; }
bool mayBeOverridden() const {
return (Linkage == WeakAnyLinkage ||
Linkage == LinkOnceAnyLinkage ||
- Linkage == CommonAnyLinkage ||
- Linkage == ExternalWeakAnyLinkage);
+ Linkage == CommonLinkage ||
+ Linkage == ExternalWeakLinkage);
}
/// isWeakForLinker - Whether the definition of this global may be replaced at
- /// link time, whether the replacement is equivalent to the original or not.
+ /// link time.
bool isWeakForLinker() const {
- return (Linkage == WeakAnyLinkage ||
+ return (Linkage == AvailableExternallyLinkage ||
+ Linkage == WeakAnyLinkage ||
Linkage == WeakODRLinkage ||
Linkage == LinkOnceAnyLinkage ||
Linkage == LinkOnceODRLinkage ||
- Linkage == CommonAnyLinkage ||
- Linkage == CommonODRLinkage ||
- Linkage == ExternalWeakAnyLinkage ||
- Linkage == ExternalWeakODRLinkage);
+ 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);
- /// hasNotBeenReadFromBitcode - If a module provider is being used to lazily
- /// stream in functions from disk, this method can be used to check to see if
- /// the function has been read in yet or not. Unless you are working on the
- /// JIT or something else that streams stuff in lazily, you don't need to
- /// worry about this.
- bool hasNotBeenReadFromBitcode() const { return Linkage == GhostLinkage; }
+/// @name Materialization
+/// Materialization is used to construct functions only as they're needed. This
+/// is useful to reduce memory usage in LLVM or parsing work done by the
+/// BitcodeReader to load the Module.
+/// @{
+
+ /// isMaterializable - If this function's Module is being lazily streamed in
+ /// functions from disk or some other source, this method can be used to check
+ /// to see if the function has been read in yet or not.
+ bool isMaterializable() const;
+
+ /// isDematerializable - Returns true if this function was loaded from a
+ /// GVMaterializer that's still attached to its Module and that knows how to
+ /// dematerialize the function.
+ bool isDematerializable() const;
+
+ /// Materialize - make sure this GlobalValue is fully read. If the module is
+ /// corrupt, this returns true and fills in the optional string with
+ /// information about the problem. If successful, this returns false.
+ bool Materialize(std::string *ErrInfo = 0);
+
+ /// Dematerialize - If this GlobalValue is read in, and if the GVMaterializer
+ /// supports it, release the memory for the function, and set it up to be
+ /// materialized lazily. If !isDematerializable(), this method is a noop.
+ void Dematerialize();
+
+/// @}
/// Override from Constant class. No GlobalValue's are null values so this
/// always returns false.
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