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Diffstat (limited to 'include/llvm/GlobalAlias.h')
-rw-r--r-- | include/llvm/GlobalAlias.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/include/llvm/GlobalAlias.h b/include/llvm/GlobalAlias.h new file mode 100644 index 0000000..b106116 --- /dev/null +++ b/include/llvm/GlobalAlias.h @@ -0,0 +1,98 @@ +//===-------- llvm/GlobalAlias.h - GlobalAlias class ------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// 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 IR. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_GLOBAL_ALIAS_H +#define LLVM_GLOBAL_ALIAS_H + +#include "llvm/GlobalValue.h" +#include "llvm/OperandTraits.h" +#include "llvm/ADT/ilist_node.h" + +namespace llvm { + +class Module; +class Constant; +template<typename ValueSubClass, typename ItemParentClass> + class SymbolTableListTraits; + +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); + +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 module's alias list. + GlobalAlias(const Type *Ty, LinkageTypes Linkage, const std::string &Name = "", + 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 + /// only a declaration here. + virtual bool isDeclaration() const; + + /// removeFromParent - This method unlinks 'this' from the containing module, + /// but does not delete it. + /// + virtual void removeFromParent(); + + /// eraseFromParent - This method unlinks 'this' from the containing module + /// and deletes it. + /// + virtual void eraseFromParent(); + + /// 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; + + /// 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; + } +}; + +template <> +struct OperandTraits<GlobalAlias> : FixedNumOperandTraits<1> { +}; + +DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalAlias, Value) + +} // End llvm namespace + +#endif |