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
25using namespace clang;
26
27void FriendDecl::anchor() {}
28
29FriendDecl *FriendDecl::getNextFriendSlowCase() {
30 return cast_or_null<FriendDecl>(
31 NextFriend.get(Source: getASTContext().getExternalSource()));
32}
33
34FriendDecl *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 Counts: FriendTypeTPLists.size());
59 auto *FD = new (C, DC, Extra) FriendDecl(DC, L, Friend, FriendL,
60 FriendTypeTPLists);
61 cast<CXXRecordDecl>(Val: DC)->pushFriendDecl(FD);
62 return FD;
63}
64
65FriendDecl *FriendDecl::CreateDeserialized(ASTContext &C, Decl::DeclID ID,
66 unsigned FriendTypeNumTPLists) {
67 std::size_t Extra =
68 additionalSizeToAlloc<TemplateParameterList *>(Counts: FriendTypeNumTPLists);
69 return new (C, ID, Extra) FriendDecl(EmptyShell(), FriendTypeNumTPLists);
70}
71
72FriendDecl *CXXRecordDecl::getFirstFriend() const {
73 ExternalASTSource *Source = getParentASTContext().getExternalSource();
74 Decl *First = data().FirstFriend.get(Source);
75 return First ? cast<FriendDecl>(Val: First) : nullptr;
76}
77

source code of clang/lib/AST/DeclFriend.cpp