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
anchor()27 void FriendDecl::anchor() {}
28
getNextFriendSlowCase()29 FriendDecl *FriendDecl::getNextFriendSlowCase() {
30 return cast_or_null<FriendDecl>(
31 NextFriend.get(getASTContext().getExternalSource()));
32 }
33
Create(ASTContext & C,DeclContext * DC,SourceLocation L,FriendUnion Friend,SourceLocation FriendL,ArrayRef<TemplateParameterList * > FriendTypeTPLists)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
CreateDeserialized(ASTContext & C,GlobalDeclID ID,unsigned FriendTypeNumTPLists)65 FriendDecl *FriendDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID,
66 unsigned FriendTypeNumTPLists) {
67 std::size_t Extra =
68 additionalSizeToAlloc<TemplateParameterList *>(FriendTypeNumTPLists);
69 return new (C, ID, Extra) FriendDecl(EmptyShell(), FriendTypeNumTPLists);
70 }
71
getFirstFriend() const72 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