1 //===-- llvm/GlobalObject.h - Class to represent global objects -*- 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 // This represents an independent object. That is, a function or a global 11 // variable, but not an alias. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_IR_GLOBALOBJECT_H 16 #define LLVM_IR_GLOBALOBJECT_H 17 18 #include "llvm/IR/Constant.h" 19 #include "llvm/IR/DerivedTypes.h" 20 #include "llvm/IR/GlobalValue.h" 21 22 namespace llvm { 23 class Comdat; 24 class Module; 25 26 class GlobalObject : public GlobalValue { 27 GlobalObject(const GlobalObject &) = delete; 28 29 protected: 30 GlobalObject(Type *Ty, ValueTy VTy, Use *Ops, unsigned NumOps, 31 LinkageTypes Linkage, const Twine &Name, 32 unsigned AddressSpace = 0) GlobalValue(Ty,VTy,Ops,NumOps,Linkage,Name,AddressSpace)33 : GlobalValue(Ty, VTy, Ops, NumOps, Linkage, Name, AddressSpace), 34 ObjComdat(nullptr) { 35 setGlobalValueSubClassData(0); 36 } 37 38 std::string Section; // Section to emit this into, empty means default 39 Comdat *ObjComdat; 40 static const unsigned AlignmentBits = 5; 41 static const unsigned GlobalObjectSubClassDataBits = 42 GlobalValueSubClassDataBits - AlignmentBits; 43 44 private: 45 static const unsigned AlignmentMask = (1 << AlignmentBits) - 1; 46 47 public: getAlignment()48 unsigned getAlignment() const { 49 unsigned Data = getGlobalValueSubClassData(); 50 unsigned AlignmentData = Data & AlignmentMask; 51 return (1u << AlignmentData) >> 1; 52 } 53 void setAlignment(unsigned Align); 54 55 unsigned getGlobalObjectSubClassData() const; 56 void setGlobalObjectSubClassData(unsigned Val); 57 hasSection()58 bool hasSection() const { return !StringRef(getSection()).empty(); } getSection()59 const char *getSection() const { return Section.c_str(); } 60 void setSection(StringRef S); 61 hasComdat()62 bool hasComdat() const { return getComdat() != nullptr; } getComdat()63 const Comdat *getComdat() const { return ObjComdat; } getComdat()64 Comdat *getComdat() { return ObjComdat; } setComdat(Comdat * C)65 void setComdat(Comdat *C) { ObjComdat = C; } 66 67 void copyAttributesFrom(const GlobalValue *Src) override; 68 69 // Methods for support type inquiry through isa, cast, and dyn_cast: classof(const Value * V)70 static inline bool classof(const Value *V) { 71 return V->getValueID() == Value::FunctionVal || 72 V->getValueID() == Value::GlobalVariableVal; 73 } 74 }; 75 76 } // End llvm namespace 77 78 #endif 79