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 #include "llvm/ADT/StringRef.h" 20 #include "llvm/Support/Compiler.h" 21 22 namespace llvm { 23 24 class raw_ostream; 25 template <typename ValueTy> class StringMapEntry; 26 27 // This is a Name X SelectionKind pair. The reason for having this be an 28 // independent object instead of just adding the name and the SelectionKind 29 // to a GlobalObject is that it is invalid to have two Comdats with the same 30 // name but different SelectionKind. This structure makes that unrepresentable. 31 class Comdat { 32 public: 33 enum SelectionKind { 34 Any, ///< The linker may choose any COMDAT. 35 ExactMatch, ///< The data referenced by the COMDAT must be the same. 36 Largest, ///< The linker will choose the largest COMDAT. 37 NoDuplicates, ///< No other Module may specify this COMDAT. 38 SameSize, ///< The data referenced by the COMDAT must be the same size. 39 }; 40 41 Comdat(Comdat &&C); 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 Comdat(); 51 Comdat(SelectionKind SK, StringMapEntry<Comdat> *Name); 52 Comdat(const Comdat &) = delete; 53 54 // Points to the map in Module. 55 StringMapEntry<Comdat> *Name; 56 SelectionKind SK; 57 }; 58 59 inline raw_ostream &operator<<(raw_ostream &OS, const Comdat &C) { 60 C.print(OS); 61 return OS; 62 } 63 64 } // end llvm namespace 65 66 #endif 67
