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      1 //===--- Visibility.h - Visibility enumeration and utilities ----*- 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 /// \brief Defines the clang::Visibility enumeration and various utility
     12 /// functions.
     13 ///
     14 //===----------------------------------------------------------------------===//
     15 #ifndef LLVM_CLANG_BASIC_VISIBILITY_H
     16 #define LLVM_CLANG_BASIC_VISIBILITY_H
     17 
     18 namespace clang {
     19 
     20 /// \brief Describes the different kinds of visibility that a declaration
     21 /// may have.
     22 ///
     23 /// Visibility determines how a declaration interacts with the dynamic
     24 /// linker.  It may also affect whether the symbol can be found by runtime
     25 /// symbol lookup APIs.
     26 ///
     27 /// Visibility is not described in any language standard and
     28 /// (nonetheless) sometimes has odd behavior.  Not all platforms
     29 /// support all visibility kinds.
     30 enum Visibility {
     31   /// Objects with "hidden" visibility are not seen by the dynamic
     32   /// linker.
     33   HiddenVisibility,
     34 
     35   /// Objects with "protected" visibility are seen by the dynamic
     36   /// linker but always dynamically resolve to an object within this
     37   /// shared object.
     38   ProtectedVisibility,
     39 
     40   /// Objects with "default" visibility are seen by the dynamic linker
     41   /// and act like normal objects.
     42   DefaultVisibility
     43 };
     44 
     45 inline Visibility minVisibility(Visibility L, Visibility R) {
     46   return L < R ? L : R;
     47 }
     48 
     49 }
     50 
     51 #endif // LLVM_CLANG_BASIC_VISIBILITY_H
     52