//===----------------------------------------------------------------------===//
//
// This file is a common base class of all globally definable objects. As such,
-// it is subclassed by GlobalVariable and by Function. This is used because you
-// can do certain things with these global objects that you can't do to anything
-// else. For example, use the address of one as a constant.
+// it is subclassed by GlobalVariable, GlobalAlias and by Function. This is
+// used because you can do certain things with these global objects that you
+// can't do to anything else. For example, use the address of one as a
+// constant.
//
//===----------------------------------------------------------------------===//
class GlobalValue : public Constant {
GlobalValue(const GlobalValue &); // do not implement
public:
+ /// @brief An enumeration for the kinds of linkage for global values.
enum LinkageTypes {
- ExternalLinkage, /// Externally visible function
- LinkOnceLinkage, /// Keep one copy of function when linking (inline)
- WeakLinkage, /// Keep one copy of named function when linking (weak)
- AppendingLinkage, /// Special purpose, only applies to global arrays
- InternalLinkage, /// Rename collisions when linking (static functions)
- 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
+ ExternalLinkage = 0,///< Externally visible function
+ LinkOnceLinkage, ///< Keep one copy of function when linking (inline)
+ WeakLinkage, ///< Keep one copy of named function when linking (weak)
+ AppendingLinkage, ///< Special purpose, only applies to global arrays
+ InternalLinkage, ///< Rename collisions when linking (static functions)
+ 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
};
+
+ /// @brief An enumeration for the kinds of visibility of global values.
enum VisibilityTypes {
- DefaultVisibility,
- HiddenVisibility
+ DefaultVisibility = 0, ///< The GV is visible
+ HiddenVisibility, ///< The GV is hidden
+ ProtectedVisibility ///< The GV is protected
};
+
protected:
GlobalValue(const Type *Ty, ValueTy vty, Use *Ops, unsigned NumOps,
LinkageTypes linkage, const std::string &name = "")
- : Constant(Ty, vty, Ops, NumOps, name), Parent(0),
- Linkage(linkage), Visibility(DefaultVisibility), Alignment(0) { }
+ : Constant(Ty, vty, Ops, NumOps), Parent(0),
+ Linkage(linkage), Visibility(DefaultVisibility), Alignment(0) {
+ if (!name.empty()) setName(name);
+ }
Module *Parent;
- LinkageTypes Linkage; // The linkage of this global
- VisibilityTypes Visibility; // The visibility style of this global
- unsigned Alignment; // Alignment of this symbol, must be power of two
- std::string Section; // Section to emit this into, empty mean default
+ // 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
+ std::string Section; // Section to emit this into, empty mean default
public:
~GlobalValue() {
removeDeadConstantUsers(); // remove any dead constants using this.
Alignment = Align;
}
- VisibilityTypes getVisibility() const { return Visibility; }
+ VisibilityTypes getVisibility() const { return (VisibilityTypes)Visibility; }
bool hasHiddenVisibility() const { return Visibility == HiddenVisibility; }
+ bool hasProtectedVisibility() const {
+ return Visibility == ProtectedVisibility;
+ }
void setVisibility(VisibilityTypes V) { Visibility = V; }
bool hasSection() const { return !Section.empty(); }
bool hasInternalLinkage() const { return Linkage == InternalLinkage; }
bool hasDLLImportLinkage() const { return Linkage == DLLImportLinkage; }
bool hasDLLExportLinkage() const { return Linkage == DLLExportLinkage; }
- bool hasExternalWeakLinkage() const { return Linkage == ExternalWeakLinkage; }
+ bool hasExternalWeakLinkage() const { return Linkage == ExternalWeakLinkage; }
void setLinkage(LinkageTypes LT) { Linkage = LT; }
LinkageTypes getLinkage() const { return Linkage; }
/// Override from Constant class.
virtual void destroyConstant();
- /// isExternal - Return true if the primary definition of this global value is
- /// outside of the current translation unit...
- virtual bool isExternal() const = 0;
+ /// isDeclaration - Return true if the primary definition of this global
+ /// value is outside of the current translation unit...
+ virtual bool isDeclaration() const = 0;
/// getParent - Get the module that this global value is contained inside
/// of...
/// 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.
- ///
- /// This method tries to make the global dead. If it detects a user that
- /// would prevent it from becoming completely dead, it gives up early,
- /// potentially leaving some dead constant users around.
void removeDeadConstantUsers();
// 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->getValueType() == Value::FunctionVal ||
- V->getValueType() == Value::GlobalVariableVal;
+ return V->getValueID() == Value::FunctionVal ||
+ V->getValueID() == Value::GlobalVariableVal ||
+ V->getValueID() == Value::GlobalAliasVal;
}
};
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