1 //===- llvm/IR/Comdat.h - Comdat definitions --------------------*- 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 /// @file 11 /// This file contains the declaration of the Comdat class, which represents a 12 /// single COMDAT in LLVM. 13 // 14 //===----------------------------------------------------------------------===// 15 16 #ifndef LLVM_IR_COMDAT_H 17 #define LLVM_IR_COMDAT_H 18 19 namespace llvm { 20 21 class raw_ostream; 22 class StringRef; 23 template <typename ValueTy> class StringMapEntry; 24 25 // This is a Name X SelectionKind pair. The reason for having this be an 26 // independent object instead of just adding the name and the SelectionKind 27 // to a GlobalObject is that it is invalid to have two Comdats with the same 28 // name but different SelectionKind. This structure makes that unrepresentable. 29 class Comdat { 30 public: 31 enum SelectionKind { 32 Any, ///< The linker may choose any COMDAT. 33 ExactMatch, ///< The data referenced by the COMDAT must be the same. 34 Largest, ///< The linker will choose the largest COMDAT. 35 NoDuplicates, ///< No other Module may specify this COMDAT. 36 SameSize, ///< The data referenced by the COMDAT must be the same size. 37 }; 38 39 Comdat(const Comdat &) = delete; 40 Comdat(Comdat &&C); 41 42 SelectionKind getSelectionKind() const { return SK; } 43 void setSelectionKind(SelectionKind Val) { SK = Val; } 44 StringRef getName() const; 45 void print(raw_ostream &OS, bool IsForDebug = false) const; 46 void dump() const; 47 48 private: 49 friend class Module; 50 51 Comdat(); 52 53 // Points to the map in Module. 54 StringMapEntry<Comdat> *Name = nullptr; 55 SelectionKind SK = Any; 56 }; 57 58 inline raw_ostream &operator<<(raw_ostream &OS, const Comdat &C) { 59 C.print(OS); 60 return OS; 61 } 62 63 } // end namespace llvm 64 65 #endif // LLVM_IR_COMDAT_H 66
