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      1 //===--- DeclFriend.cpp - C++ Friend Declaration AST Node Implementation --===//
      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 // This file implements the AST classes related to C++ friend
     11 // declarations.
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #include "clang/AST/ASTContext.h"
     16 #include "clang/AST/DeclFriend.h"
     17 #include "clang/AST/DeclTemplate.h"
     18 using namespace clang;
     19 
     20 void FriendDecl::anchor() { }
     21 
     22 FriendDecl *FriendDecl::getNextFriendSlowCase() {
     23   return cast_or_null<FriendDecl>(
     24                            NextFriend.get(getASTContext().getExternalSource()));
     25 }
     26 
     27 FriendDecl *FriendDecl::Create(ASTContext &C, DeclContext *DC,
     28                                SourceLocation L,
     29                                FriendUnion Friend,
     30                                SourceLocation FriendL,
     31                         ArrayRef<TemplateParameterList*> FriendTypeTPLists) {
     32 #ifndef NDEBUG
     33   if (Friend.is<NamedDecl*>()) {
     34     NamedDecl *D = Friend.get<NamedDecl*>();
     35     assert(isa<FunctionDecl>(D) ||
     36            isa<CXXRecordDecl>(D) ||
     37            isa<FunctionTemplateDecl>(D) ||
     38            isa<ClassTemplateDecl>(D));
     39 
     40     // As a temporary hack, we permit template instantiation to point
     41     // to the original declaration when instantiating members.
     42     assert(D->getFriendObjectKind() ||
     43            (cast<CXXRecordDecl>(DC)->getTemplateSpecializationKind()));
     44     // These template parameters are for friend types only.
     45     assert(FriendTypeTPLists.size() == 0);
     46   }
     47 #endif
     48 
     49   std::size_t Extra =
     50       FriendDecl::additionalSizeToAlloc<TemplateParameterList *>(
     51           FriendTypeTPLists.size());
     52   FriendDecl *FD = new (C, DC, Extra) FriendDecl(DC, L, Friend, FriendL,
     53                                                  FriendTypeTPLists);
     54   cast<CXXRecordDecl>(DC)->pushFriendDecl(FD);
     55   return FD;
     56 }
     57 
     58 FriendDecl *FriendDecl::CreateDeserialized(ASTContext &C, unsigned ID,
     59                                            unsigned FriendTypeNumTPLists) {
     60   std::size_t Extra =
     61       additionalSizeToAlloc<TemplateParameterList *>(FriendTypeNumTPLists);
     62   return new (C, ID, Extra) FriendDecl(EmptyShell(), FriendTypeNumTPLists);
     63 }
     64 
     65 FriendDecl *CXXRecordDecl::getFirstFriend() const {
     66   ExternalASTSource *Source = getParentASTContext().getExternalSource();
     67   Decl *First = data().FirstFriend.get(Source);
     68   return First ? cast<FriendDecl>(First) : nullptr;
     69 }
     70