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      1 //===- DeclFriend.cpp - C++ Friend Declaration AST Node Implementation ----===//
      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 // This file implements the AST classes related to C++ friend
     10 // declarations.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "clang/AST/DeclFriend.h"
     15 #include "clang/AST/Decl.h"
     16 #include "clang/AST/DeclBase.h"
     17 #include "clang/AST/DeclCXX.h"
     18 #include "clang/AST/ASTContext.h"
     19 #include "clang/AST/DeclTemplate.h"
     20 #include "clang/Basic/LLVM.h"
     21 #include "llvm/Support/Casting.h"
     22 #include <cassert>
     23 #include <cstddef>
     24 
     25 using namespace clang;
     26 
     27 void FriendDecl::anchor() {}
     28 
     29 FriendDecl *FriendDecl::getNextFriendSlowCase() {
     30   return cast_or_null<FriendDecl>(
     31                            NextFriend.get(getASTContext().getExternalSource()));
     32 }
     33 
     34 FriendDecl *FriendDecl::Create(ASTContext &C, DeclContext *DC,
     35                                SourceLocation L,
     36                                FriendUnion Friend,
     37                                SourceLocation FriendL,
     38                           ArrayRef<TemplateParameterList *> FriendTypeTPLists) {
     39 #ifndef NDEBUG
     40   if (Friend.is<NamedDecl *>()) {
     41     const auto *D = Friend.get<NamedDecl*>();
     42     assert(isa<FunctionDecl>(D) ||
     43            isa<CXXRecordDecl>(D) ||
     44            isa<FunctionTemplateDecl>(D) ||
     45            isa<ClassTemplateDecl>(D));
     46 
     47     // As a temporary hack, we permit template instantiation to point
     48     // to the original declaration when instantiating members.
     49     assert(D->getFriendObjectKind() ||
     50            (cast<CXXRecordDecl>(DC)->getTemplateSpecializationKind()));
     51     // These template parameters are for friend types only.
     52     assert(FriendTypeTPLists.empty());
     53   }
     54 #endif
     55 
     56   std::size_t Extra =
     57       FriendDecl::additionalSizeToAlloc<TemplateParameterList *>(
     58           FriendTypeTPLists.size());
     59   auto *FD = new (C, DC, Extra) FriendDecl(DC, L, Friend, FriendL,
     60                                            FriendTypeTPLists);
     61   cast<CXXRecordDecl>(DC)->pushFriendDecl(FD);
     62   return FD;
     63 }
     64 
     65 FriendDecl *FriendDecl::CreateDeserialized(ASTContext &C, unsigned ID,
     66                                            unsigned FriendTypeNumTPLists) {
     67   std::size_t Extra =
     68       additionalSizeToAlloc<TemplateParameterList *>(FriendTypeNumTPLists);
     69   return new (C, ID, Extra) FriendDecl(EmptyShell(), FriendTypeNumTPLists);
     70 }
     71 
     72 FriendDecl *CXXRecordDecl::getFirstFriend() const {
     73   ExternalASTSource *Source = getParentASTContext().getExternalSource();
     74   Decl *First = data().FirstFriend.get(Source);
     75   return First ? cast<FriendDecl>(First) : nullptr;
     76 }
     77