#include "llvm/IR/Constant.h"
#include "llvm/IR/DerivedTypes.h"
+#include <system_error>
namespace llvm {
+class Comdat;
class PointerType;
class Module;
+namespace Intrinsic {
+ enum ID : unsigned;
+}
+
class GlobalValue : public Constant {
- GlobalValue(const GlobalValue &) LLVM_DELETED_FUNCTION;
+ GlobalValue(const GlobalValue &) = delete;
public:
/// @brief An enumeration for the kinds of linkage for global values.
enum LinkageTypes {
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(nullptr) {
+ LinkageTypes Linkage, const Twine &Name, unsigned AddressSpace)
+ : Constant(PointerType::get(Ty, AddressSpace), VTy, Ops, NumOps),
+ ValueType(Ty), Linkage(Linkage), Visibility(DefaultVisibility),
+ UnnamedAddr(0), DllStorageClass(DefaultStorageClass),
+ ThreadLocal(NotThreadLocal), IntID((Intrinsic::ID)0U), Parent(nullptr) {
setName(Name);
}
+ Type *ValueType;
// 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
unsigned DllStorageClass : 2; // DLL storage class
+
+ unsigned ThreadLocal : 3; // Is this symbol "Thread Local", if so, what is
+ // the desired model?
+ static const unsigned GlobalValueSubClassDataBits = 19;
+
+private:
+ // Give subclasses access to what otherwise would be wasted padding.
+ // (19 + 3 + 2 + 1 + 2 + 5) == 32.
+ unsigned SubClassData : GlobalValueSubClassDataBits;
+
+ friend class Constant;
+ void destroyConstantImpl();
+ Value *handleOperandChangeImpl(Value *From, Value *To, Use *U);
+
+protected:
+ /// \brief The intrinsic ID for this subclass (which must be a Function).
+ ///
+ /// This member is defined by this class, but not used for anything.
+ /// Subclasses can use it to store their intrinsic ID, if they have one.
+ ///
+ /// This is stored here to save space in Function on 64-bit hosts.
+ Intrinsic::ID IntID;
+
+ unsigned getGlobalValueSubClassData() const {
+ return SubClassData;
+ }
+ void setGlobalValueSubClassData(unsigned V) {
+ assert(V < (1 << GlobalValueSubClassDataBits) && "It will not fit");
+ SubClassData = V;
+ }
+
Module *Parent; // The containing module.
- std::string Section; // Section to emit this into, empty mean default
public:
- ~GlobalValue() {
+ enum ThreadLocalMode {
+ NotThreadLocal = 0,
+ GeneralDynamicTLSModel,
+ LocalDynamicTLSModel,
+ InitialExecTLSModel,
+ LocalExecTLSModel
+ };
+
+ ~GlobalValue() override {
removeDeadConstantUsers(); // remove any dead constants using this.
}
unsigned getAlignment() const;
- void setAlignment(unsigned Align);
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; }
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 !getSection().empty(); }
- const std::string &getSection() const;
- void setSection(StringRef S);
+ 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;
/// Global values are always pointers.
- inline PointerType *getType() const {
- return cast<PointerType>(User::getType());
- }
+ PointerType *getType() const { return cast<PointerType>(User::getType()); }
+
+ Type *getValueType() const { return ValueType; }
static LinkageTypes getLinkOnceLinkage(bool ODR) {
return ODR ? LinkOnceODRLinkage : LinkOnceAnyLinkage;
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;
}
/// 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);
+ return isLinkOnceLinkage(Linkage) || isLocalLinkage(Linkage) ||
+ isAvailableExternallyLinkage(Linkage);
}
/// Whether the definition of this global may be replaced by something
/// 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;
+ return Linkage == WeakAnyLinkage || Linkage == WeakODRLinkage ||
+ Linkage == LinkOnceAnyLinkage || Linkage == LinkOnceODRLinkage ||
+ Linkage == CommonLinkage || Linkage == ExternalWeakLinkage ||
+ Linkage == AvailableExternallyLinkage;
}
bool hasExternalLinkage() const { return isExternalLinkage(Linkage); }
bool hasLinkOnceLinkage() const {
return isLinkOnceLinkage(Linkage);
}
+ bool hasLinkOnceODRLinkage() const { return isLinkOnceODRLinkage(Linkage); }
bool hasWeakLinkage() const {
return isWeakLinkage(Linkage);
}
bool hasCommonLinkage() const { return isCommonLinkage(Linkage); }
void setLinkage(LinkageTypes LT) {
- assert((!isLocalLinkage(LT) || hasDefaultVisibility()) &&
- "local linkage requires default visibility");
+ if (isLocalLinkage(LT))
+ Visibility = DefaultVisibility;
Linkage = LT;
}
LinkageTypes getLinkage() const { return Linkage; }
/// 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);
+ std::error_code materialize();
/// 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();
+ void dematerialize();
/// @}
- /// Override from Constant class.
- void destroyConstant() override;
-
/// Return true if the primary definition of this global value is outside of
/// the current translation unit.
bool isDeclaration() const;
+ bool isDeclarationForLinker() const {
+ if (hasAvailableExternallyLinkage())
+ return true;
+
+ return isDeclaration();
+ }
+
+ /// Returns true if this global's definition will be the one chosen by the
+ /// linker.
+ bool isStrongDefinitionForLinker() const {
+ return !(isDeclarationForLinker() || isWeakForLinker());
+ }
+
/// This method unlinks 'this' from the containing module, but does not delete
/// it.
virtual void removeFromParent() = 0;
virtual void eraseFromParent() = 0;
/// Get the module that this global value is contained inside of...
- inline Module *getParent() { return Parent; }
- inline const Module *getParent() const { return Parent; }
-
- const DataLayout *getDataLayout() const;
+ Module *getParent() { return Parent; }
+ const Module *getParent() const { return Parent; }
// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const Value *V) {
+ static bool classof(const Value *V) {
return V->getValueID() == Value::FunctionVal ||
V->getValueID() == Value::GlobalVariableVal ||
V->getValueID() == Value::GlobalAliasVal;
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