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(Comdat &&C); getSelectionKind()40 SelectionKind getSelectionKind() const { return SK; } setSelectionKind(SelectionKind Val)41 void setSelectionKind(SelectionKind Val) { SK = Val; } 42 StringRef getName() const; 43 void print(raw_ostream &OS, bool IsForDebug = false) const; 44 void dump() const; 45 46 private: 47 friend class Module; 48 Comdat(); 49 Comdat(const Comdat &) = delete; 50 51 // Points to the map in Module. 52 StringMapEntry<Comdat> *Name; 53 SelectionKind SK; 54 }; 55 56 inline raw_ostream &operator<<(raw_ostream &OS, const Comdat &C) { 57 C.print(OS); 58 return OS; 59 } 60 61 } // end llvm namespace 62 63 #endif 64