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