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(PointerType *Ty, ValueTy VTy, Use *Ops, unsigned NumOps, 31 LinkageTypes Linkage, const Twine &Name) 32 : GlobalValue(Ty, VTy, Ops, NumOps, Linkage, Name), ObjComdat(nullptr) { 33 setGlobalValueSubClassData(0); 34 } 35 36 std::string Section; // Section to emit this into, empty means default 37 Comdat *ObjComdat; 38 static const unsigned AlignmentBits = 5; 39 static const unsigned GlobalObjectSubClassDataBits = 40 GlobalValueSubClassDataBits - AlignmentBits; 41 42 private: 43 static const unsigned AlignmentMask = (1 << AlignmentBits) - 1; 44 45 public: 46 unsigned getAlignment() const { 47 unsigned Data = getGlobalValueSubClassData(); 48 unsigned AlignmentData = Data & AlignmentMask; 49 return (1u << AlignmentData) >> 1; 50 } 51 void setAlignment(unsigned Align); 52 53 unsigned getGlobalObjectSubClassData() const; 54 void setGlobalObjectSubClassData(unsigned Val); 55 56 bool hasSection() const { return !StringRef(getSection()).empty(); } 57 const char *getSection() const { return Section.c_str(); } 58 void setSection(StringRef S); 59 60 bool hasComdat() const { return getComdat() != nullptr; } 61 const Comdat *getComdat() const { return ObjComdat; } 62 Comdat *getComdat() { return ObjComdat; } 63 void setComdat(Comdat *C) { ObjComdat = C; } 64 65 void copyAttributesFrom(const GlobalValue *Src) override; 66 67 // Methods for support type inquiry through isa, cast, and dyn_cast: 68 static inline bool classof(const Value *V) { 69 return V->getValueID() == Value::FunctionVal || 70 V->getValueID() == Value::GlobalVariableVal; 71 } 72 }; 73 74 } // End llvm namespace 75 76 #endif 77
