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