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  1. //===- llvm/IR/Comdat.h - Comdat definitions --------------------*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8. //
  9. /// @file
  10. /// This file contains the declaration of the Comdat class, which represents a
  11. /// single COMDAT in LLVM.
  12. //
  13. //===----------------------------------------------------------------------===//
  14.  
  15. #ifndef LLVM_IR_COMDAT_H
  16. #define LLVM_IR_COMDAT_H
  17.  
  18. #include "llvm-c/Types.h"
  19. #include "llvm/ADT/SmallPtrSet.h"
  20. #include "llvm/Support/CBindingWrapping.h"
  21.  
  22. namespace llvm {
  23.  
  24. class GlobalObject;
  25. class raw_ostream;
  26. class StringRef;
  27. template <typename ValueTy> class StringMapEntry;
  28.  
  29. // This is a Name X SelectionKind pair. The reason for having this be an
  30. // independent object instead of just adding the name and the SelectionKind
  31. // to a GlobalObject is that it is invalid to have two Comdats with the same
  32. // name but different SelectionKind. This structure makes that unrepresentable.
  33. class Comdat {
  34. public:
  35.   enum SelectionKind {
  36.     Any,           ///< The linker may choose any COMDAT.
  37.     ExactMatch,    ///< The data referenced by the COMDAT must be the same.
  38.     Largest,       ///< The linker will choose the largest COMDAT.
  39.     NoDeduplicate, ///< No deduplication is performed.
  40.     SameSize,      ///< The data referenced by the COMDAT must be the same size.
  41.   };
  42.  
  43.   Comdat(const Comdat &) = delete;
  44.   Comdat(Comdat &&C);
  45.  
  46.   SelectionKind getSelectionKind() const { return SK; }
  47.   void setSelectionKind(SelectionKind Val) { SK = Val; }
  48.   StringRef getName() const;
  49.   void print(raw_ostream &OS, bool IsForDebug = false) const;
  50.   void dump() const;
  51.   const SmallPtrSetImpl<GlobalObject *> &getUsers() const { return Users; }
  52.  
  53. private:
  54.   friend class Module;
  55.   friend class GlobalObject;
  56.  
  57.   Comdat();
  58.   void addUser(GlobalObject *GO);
  59.   void removeUser(GlobalObject *GO);
  60.  
  61.   // Points to the map in Module.
  62.   StringMapEntry<Comdat> *Name = nullptr;
  63.   SelectionKind SK = Any;
  64.   // Globals using this comdat.
  65.   SmallPtrSet<GlobalObject *, 2> Users;
  66. };
  67.  
  68. // Create wrappers for C Binding types (see CBindingWrapping.h).
  69. DEFINE_SIMPLE_CONVERSION_FUNCTIONS(Comdat, LLVMComdatRef)
  70.  
  71. inline raw_ostream &operator<<(raw_ostream &OS, const Comdat &C) {
  72.   C.print(OS);
  73.   return OS;
  74. }
  75.  
  76. } // end namespace llvm
  77.  
  78. #endif // LLVM_IR_COMDAT_H
  79.