DeclFriend.cpp revision 263508 
1//===--- DeclFriend.cpp - C++ Friend Declaration AST Node Implementation --===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the AST classes related to C++ friend
11// declarations.
12//
13//===----------------------------------------------------------------------===//
14
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/DeclFriend.h"
17#include "clang/AST/DeclTemplate.h"
18using namespace clang;
19
20void FriendDecl::anchor() { }
21
22FriendDecl *FriendDecl::getNextFriendSlowCase() {
23  return cast_or_null<FriendDecl>(
24                           NextFriend.get(getASTContext().getExternalSource()));
25}
26
27FriendDecl *FriendDecl::Create(ASTContext &C, DeclContext *DC,
28                               SourceLocation L,
29                               FriendUnion Friend,
30                               SourceLocation FriendL,
31                        ArrayRef<TemplateParameterList*> FriendTypeTPLists) {
32#ifndef NDEBUG
33  if (Friend.is<NamedDecl*>()) {
34    NamedDecl *D = Friend.get<NamedDecl*>();
35    assert(isa<FunctionDecl>(D) ||
36           isa<CXXRecordDecl>(D) ||
37           isa<FunctionTemplateDecl>(D) ||
38           isa<ClassTemplateDecl>(D));
39
40    // As a temporary hack, we permit template instantiation to point
41    // to the original declaration when instantiating members.
42    assert(D->getFriendObjectKind() ||
43           (cast<CXXRecordDecl>(DC)->getTemplateSpecializationKind()));
44    // These template parameters are for friend types only.
45    assert(FriendTypeTPLists.size() == 0);
46  }
47#endif
48
49  std::size_t Size = sizeof(FriendDecl)
50    + FriendTypeTPLists.size() * sizeof(TemplateParameterList*);
51  void *Mem = C.Allocate(Size);
52  FriendDecl *FD = new (Mem) FriendDecl(DC, L, Friend, FriendL,
53                                        FriendTypeTPLists);
54  cast<CXXRecordDecl>(DC)->pushFriendDecl(FD);
55  return FD;
56}
57
58FriendDecl *FriendDecl::CreateDeserialized(ASTContext &C, unsigned ID,
59                                           unsigned FriendTypeNumTPLists) {
60  std::size_t Size = sizeof(FriendDecl)
61    + FriendTypeNumTPLists * sizeof(TemplateParameterList*);
62  void *Mem = AllocateDeserializedDecl(C, ID, Size);
63  return new (Mem) FriendDecl(EmptyShell(), FriendTypeNumTPLists);
64}
65
66FriendDecl *CXXRecordDecl::getFirstFriend() const {
67  ExternalASTSource *Source = getParentASTContext().getExternalSource();
68  Decl *First = data().FirstFriend.get(Source);
69  return First ? cast<FriendDecl>(First) : 0;
70}
71