namespace llvm {
+class Comdat;
class PointerType;
class Module;
};
protected:
- GlobalValue(Type *ty, ValueTy vty, Use *Ops, unsigned NumOps,
- LinkageTypes linkage, const Twine &Name)
- : Constant(ty, vty, Ops, NumOps), Linkage(linkage),
- Visibility(DefaultVisibility), Alignment(0), UnnamedAddr(0),
- DllStorageClass(DefaultStorageClass), Parent(0) {
+ GlobalValue(Type *Ty, ValueTy VTy, Use *Ops, unsigned NumOps,
+ LinkageTypes Linkage, const Twine &Name)
+ : Constant(Ty, VTy, Ops, NumOps), Linkage(Linkage),
+ Visibility(DefaultVisibility), UnnamedAddr(0),
+ DllStorageClass(DefaultStorageClass),
+ ThreadLocal(NotThreadLocal), Parent(nullptr) {
setName(Name);
}
// 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
unsigned DllStorageClass : 2; // DLL storage class
+
+ unsigned ThreadLocal : 3; // Is this symbol "Thread Local", if so, what is
+ // the desired model?
+
+private:
+ // Give subclasses access to what otherwise would be wasted padding.
+ // (19 + 3 + 2 + 1 + 2 + 5) == 32.
+ unsigned SubClassData : 19;
+protected:
+ unsigned getGlobalValueSubClassData() const {
+ return SubClassData;
+ }
+ void setGlobalValueSubClassData(unsigned V) {
+ assert(V < (1 << 19) && "It will not fit");
+ SubClassData = V;
+ }
+
Module *Parent; // The containing module.
- std::string Section; // Section to emit this into, empty mean default
public:
+ enum ThreadLocalMode {
+ NotThreadLocal = 0,
+ GeneralDynamicTLSModel,
+ LocalDynamicTLSModel,
+ InitialExecTLSModel,
+ LocalExecTLSModel
+ };
+
~GlobalValue() {
removeDeadConstantUsers(); // remove any dead constants using this.
}
- unsigned getAlignment() const {
- return (1u << Alignment) >> 1;
- }
- void setAlignment(unsigned Align);
+ unsigned getAlignment() const;
bool hasUnnamedAddr() const { return UnnamedAddr; }
void setUnnamedAddr(bool Val) { UnnamedAddr = Val; }
+ bool hasComdat() const { return getComdat() != nullptr; }
+ Comdat *getComdat();
+ const Comdat *getComdat() const {
+ return const_cast<GlobalValue *>(this)->getComdat();
+ }
+
VisibilityTypes getVisibility() const { return VisibilityTypes(Visibility); }
bool hasDefaultVisibility() const { return Visibility == DefaultVisibility; }
bool hasHiddenVisibility() const { return Visibility == HiddenVisibility; }
bool hasProtectedVisibility() const {
return Visibility == ProtectedVisibility;
}
- void setVisibility(VisibilityTypes V) { Visibility = V; }
+ void setVisibility(VisibilityTypes V) {
+ assert((!hasLocalLinkage() || V == DefaultVisibility) &&
+ "local linkage requires default visibility");
+ Visibility = V;
+ }
+
+ /// If the value is "Thread Local", its value isn't shared by the threads.
+ bool isThreadLocal() const { return getThreadLocalMode() != NotThreadLocal; }
+ void setThreadLocal(bool Val) {
+ setThreadLocalMode(Val ? GeneralDynamicTLSModel : NotThreadLocal);
+ }
+ void setThreadLocalMode(ThreadLocalMode Val) {
+ assert(Val == NotThreadLocal || getValueID() != Value::FunctionVal);
+ ThreadLocal = Val;
+ }
+ ThreadLocalMode getThreadLocalMode() const {
+ return static_cast<ThreadLocalMode>(ThreadLocal);
+ }
DLLStorageClassTypes getDLLStorageClass() const {
return DLLStorageClassTypes(DllStorageClass);
}
void setDLLStorageClass(DLLStorageClassTypes C) { DllStorageClass = C; }
- bool hasSection() const { return !Section.empty(); }
- const std::string &getSection() const { return Section; }
- void setSection(StringRef S) {
- assert((getValueID() != Value::GlobalAliasVal || S.empty()) &&
- "GlobalAlias should not have a section!");
- Section = S;
- }
-
- /// If the usage is empty (except transitively dead constants), then this
- /// global value can be safely deleted since the destructor will
- /// delete the dead constants as well.
- /// @brief Determine if the usage of this global value is empty except
- /// for transitively dead constants.
- bool use_empty_except_constants();
+ bool hasSection() const { return !StringRef(getSection()).empty(); }
+ // It is unfortunate that we have to use "char *" in here since this is
+ // always non NULL, but:
+ // * The C API expects a null terminated string, so we cannot use StringRef.
+ // * The C API expects us to own it, so we cannot use a std:string.
+ // * For GlobalAliases we can fail to find the section and we have to
+ // return "", so we cannot use a "const std::string &".
+ const char *getSection() const;
- /// getType - Global values are always pointers.
+ /// Global values are always pointers.
inline PointerType *getType() const {
return cast<PointerType>(User::getType());
}
static bool isAvailableExternallyLinkage(LinkageTypes Linkage) {
return Linkage == AvailableExternallyLinkage;
}
+ static bool isLinkOnceODRLinkage(LinkageTypes Linkage) {
+ return Linkage == LinkOnceODRLinkage;
+ }
static bool isLinkOnceLinkage(LinkageTypes Linkage) {
return Linkage == LinkOnceAnyLinkage || Linkage == LinkOnceODRLinkage;
}
+ static bool isWeakAnyLinkage(LinkageTypes Linkage) {
+ return Linkage == WeakAnyLinkage;
+ }
+ static bool isWeakODRLinkage(LinkageTypes Linkage) {
+ return Linkage == WeakODRLinkage;
+ }
static bool isWeakLinkage(LinkageTypes Linkage) {
- return Linkage == WeakAnyLinkage || Linkage == WeakODRLinkage;
+ return isWeakAnyLinkage(Linkage) || isWeakODRLinkage(Linkage);
}
static bool isAppendingLinkage(LinkageTypes Linkage) {
return Linkage == AppendingLinkage;
return Linkage == CommonLinkage;
}
- /// isDiscardableIfUnused - Whether the definition of this global may be
- /// discarded if it is not used in its compilation unit.
+ /// 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.
+ /// 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;
}
- /// isWeakForLinker - Whether the definition of this global may be replaced at
- /// 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.
+ /// Whether the definition of this global may be replaced at 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 ||
bool hasLinkOnceLinkage() const {
return isLinkOnceLinkage(Linkage);
}
+ bool hasLinkOnceODRLinkage() const { return isLinkOnceODRLinkage(Linkage); }
bool hasWeakLinkage() const {
return isWeakLinkage(Linkage);
}
+ bool hasWeakAnyLinkage() const {
+ return isWeakAnyLinkage(Linkage);
+ }
+ bool hasWeakODRLinkage() const {
+ return isWeakODRLinkage(Linkage);
+ }
bool hasAppendingLinkage() const { return isAppendingLinkage(Linkage); }
bool hasInternalLinkage() const { return isInternalLinkage(Linkage); }
bool hasPrivateLinkage() const { return isPrivateLinkage(Linkage); }
bool hasExternalWeakLinkage() const { return isExternalWeakLinkage(Linkage); }
bool hasCommonLinkage() const { return isCommonLinkage(Linkage); }
- void setLinkage(LinkageTypes LT) { Linkage = LT; }
+ void setLinkage(LinkageTypes LT) {
+ if (isLocalLinkage(LT))
+ Visibility = DefaultVisibility;
+ Linkage = LT;
+ }
LinkageTypes getLinkage() const { return Linkage; }
bool isDiscardableIfUnused() const {
bool isWeakForLinker() const { return isWeakForLinker(Linkage); }
- /// copyAttributesFrom - copy all additional attributes (those not needed to
- /// create a GlobalValue) from the GlobalValue Src to this one.
+ /// Copy all additional attributes (those not needed to create a GlobalValue)
+ /// from the GlobalValue Src to this one.
virtual void copyAttributesFrom(const GlobalValue *Src);
- /// getRealLinkageName - If special LLVM prefix that is used to inform the asm
- /// printer to not emit usual symbol prefix before the symbol name is used
- /// then return linkage name after skipping this special LLVM prefix.
+ /// If special LLVM prefix that is used to inform the asm printer to not emit
+ /// usual symbol prefix before the symbol name is used then return linkage
+ /// name after skipping this special LLVM prefix.
static StringRef getRealLinkageName(StringRef Name) {
if (!Name.empty() && Name[0] == '\1')
return Name.substr(1);
/// 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.
+ /// 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.
+ /// 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);
+ /// 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 = nullptr);
- /// 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.
+ /// 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.
void destroyConstant() override;
- /// isDeclaration - Return true if the primary definition of this global
- /// value is outside of the current translation unit.
+ /// Return true if the primary definition of this global 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.
+ /// 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.
+ /// 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...
+ /// Get the module that this global value is contained inside of...
inline Module *getParent() { return Parent; }
inline const Module *getParent() const { return Parent; }