1 //===-------- llvm/GlobalIFunc.h - GlobalIFunc class ------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 /// 10 /// \brief 11 /// This file contains the declaration of the GlobalIFunc class, which 12 /// represents a single indirect function in the IR. Indirect function uses 13 /// ELF symbol type extension to mark that the address of a declaration should 14 /// be resolved at runtime by calling a resolver function. 15 /// 16 //===----------------------------------------------------------------------===// 17 18 #ifndef LLVM_IR_GLOBALIFUNC_H 19 #define LLVM_IR_GLOBALIFUNC_H 20 21 #include "llvm/ADT/ilist_node.h" 22 #include "llvm/IR/GlobalIndirectSymbol.h" 23 #include "llvm/IR/Value.h" 24 25 namespace llvm { 26 27 class Twine; 28 class Module; 29 30 // Traits class for using GlobalIFunc in symbol table in Module. 31 template <typename ValueSubClass> class SymbolTableListTraits; 32 33 class GlobalIFunc final : public GlobalIndirectSymbol, 34 public ilist_node<GlobalIFunc> { 35 friend class SymbolTableListTraits<GlobalIFunc>; 36 37 GlobalIFunc(Type *Ty, unsigned AddressSpace, LinkageTypes Linkage, 38 const Twine &Name, Constant *Resolver, Module *Parent); 39 40 public: 41 GlobalIFunc(const GlobalIFunc &) = delete; 42 GlobalIFunc &operator=(const GlobalIFunc &) = delete; 43 44 /// If a parent module is specified, the ifunc is automatically inserted into 45 /// the end of the specified module's ifunc list. 46 static GlobalIFunc *create(Type *Ty, unsigned AddressSpace, 47 LinkageTypes Linkage, const Twine &Name, 48 Constant *Resolver, Module *Parent); 49 50 void copyAttributesFrom(const GlobalIFunc *Src) { 51 GlobalValue::copyAttributesFrom(Src); 52 } 53 54 /// This method unlinks 'this' from the containing module, but does not 55 /// delete it. 56 void removeFromParent(); 57 58 /// This method unlinks 'this' from the containing module and deletes it. 59 void eraseFromParent(); 60 61 /// These methods retrieve and set ifunc resolver function. 62 void setResolver(Constant *Resolver) { 63 setIndirectSymbol(Resolver); 64 } 65 const Constant *getResolver() const { 66 return getIndirectSymbol(); 67 } 68 Constant *getResolver() { 69 return getIndirectSymbol(); 70 } 71 72 // Methods for support type inquiry through isa, cast, and dyn_cast: 73 static bool classof(const Value *V) { 74 return V->getValueID() == Value::GlobalIFuncVal; 75 } 76 }; 77 78 } // end namespace llvm 79 80 #endif // LLVM_IR_GLOBALIFUNC_H 81
