-//===______-- llvm/GlobalAlias.h - GlobalAlias class ------------*- C++ -*-===//
+//===-------- llvm/GlobalAlias.h - GlobalAlias class ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Anton Korobeynikov and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declaration of the GlobalAlias class, which
-// represents a single function or variable alias in the VM.
+// represents a single function or variable alias in the IR.
//
//===----------------------------------------------------------------------===//
#define LLVM_GLOBAL_ALIAS_H
#include "llvm/GlobalValue.h"
+#include "llvm/OperandTraits.h"
+#include "llvm/ADT/ilist_node.h"
namespace llvm {
template<typename ValueSubClass, typename ItemParentClass>
class SymbolTableListTraits;
-class GlobalAlias : public GlobalValue {
+class GlobalAlias : public GlobalValue, public ilist_node<GlobalAlias> {
friend class SymbolTableListTraits<GlobalAlias, Module>;
void operator=(const GlobalAlias &); // Do not implement
GlobalAlias(const GlobalAlias &); // Do not implement
void setParent(Module *parent);
- GlobalAlias *Prev, *Next;
- void setNext(GlobalAlias *N) { Next = N; }
- void setPrev(GlobalAlias *N) { Prev = N; }
-
- const GlobalValue* Aliasee;
- std::string Target;
public:
+ // allocate space for exactly one operand
+ void *operator new(size_t s) {
+ return User::operator new(s, 1);
+ }
/// GlobalAlias ctor - If a parent module is specified, the alias is
- /// automatically inserted into the end of the specified modules alias list.
+ /// automatically inserted into the end of the specified module's alias list.
GlobalAlias(const Type *Ty, LinkageTypes Linkage, const std::string &Name = "",
- const GlobalValue* Aliasee = 0, Module *Parent = 0);
+ Constant* Aliasee = 0, Module *Parent = 0);
+
+ /// Provide fast operand accessors
+ DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
/// isDeclaration - Is this global variable lacking an initializer? If so,
/// the global variable is defined in some other translation unit, and is thus
///
virtual void eraseFromParent();
- virtual void print(std::ostream &OS) const;
- void print(std::ostream *OS) const { if (OS) print(*OS); }
+ /// set/getAliasee - These methods retrive and set alias target.
+ void setAliasee(Constant* GV);
+ const Constant* getAliasee() const {
+ return cast_or_null<Constant>(getOperand(0));
+ }
+ Constant* getAliasee() {
+ return cast_or_null<Constant>(getOperand(0));
+ }
+ /// getAliasedGlobal() - Aliasee can be either global or bitcast of
+ /// global. This method retrives the global for both aliasee flavours.
+ const GlobalValue* getAliasedGlobal() const;
- void setAliasee(const GlobalValue* GV);
- const GlobalValue* getAliasee() const { return Aliasee; }
+ /// resolveAliasedGlobal() - This method tries to ultimately resolve the alias
+ /// by going through the aliasing chain and trying to find the very last
+ /// global. Returns NULL if a cycle was found. If stopOnWeak is false, then
+ /// the whole chain aliasing chain is traversed, otherwise - only strong
+ /// aliases.
+ const GlobalValue* resolveAliasedGlobal(bool stopOnWeak = true) const;
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const GlobalAlias *) { return true; }
static inline bool classof(const Value *V) {
return V->getValueID() == Value::GlobalAliasVal;
}
-private:
- // getNext/Prev - Return the next or previous alias in the list.
- GlobalAlias *getNext() { return Next; }
- const GlobalAlias *getNext() const { return Next; }
- GlobalAlias *getPrev() { return Prev; }
- const GlobalAlias *getPrev() const { return Prev; }
};
+template <>
+struct OperandTraits<GlobalAlias> : FixedNumOperandTraits<1> {
+};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalAlias, Value)
+
} // End llvm namespace
#endif