LinkOnceLinkage, // Keep one copy of named 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)
+ InternalLinkage, // Rename collisions when linking (static functions)
+ GhostLinkage // Stand-in functions for streaming fns from BC files
};
protected:
GlobalValue(const Type *Ty, ValueTy vty, LinkageTypes linkage,
LinkageTypes Linkage; // The linkage of this global
Module *Parent;
public:
- virtual ~GlobalValue();
+ ~GlobalValue() {
+ removeDeadConstantUsers(); // remove any dead constants using this.
+ }
/// If the usage is empty (except transitively dead constants), then this
- /// global value can can be safely deleted since the destructor wll
+ /// global value can can be safely deleted since the destructor will
/// delete the dead constants as well.
- /// @brief Determine if theusage of this global value is empty except
+ /// @brief Determine if the usage of this global value is empty except
/// for transitively dead constants.
bool use_empty_except_constants();
void setLinkage(LinkageTypes LT) { Linkage = LT; }
LinkageTypes getLinkage() const { return Linkage; }
- /// Override from Constant class. No GlobalValue's have null values so
- /// this always returns false.
+ /// hasNotBeenReadFromBytecode - 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 hasNotBeenReadFromBytecode() const { return Linkage == GhostLinkage; }
+
+ /// 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.
/// 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 function returns true if the global value is now dead. If all
- /// users of this global are not dead, this method may return false and
- /// leave some of them around.
- bool removeDeadConstantUsers();
+ /// 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 *T) { return true; }