Coverage Report

Created: 2019-03-22 08:08

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/tools/clang/include/clang/AST/DeclFriend.h
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//===- DeclFriend.h - Classes for C++ friend declarations -------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the section of the AST representing C++ friend
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// declarations.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_AST_DECLFRIEND_H
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#define LLVM_CLANG_AST_DECLFRIEND_H
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclBase.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/DeclTemplate.h"
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#include "clang/AST/ExternalASTSource.h"
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#include "clang/AST/TypeLoc.h"
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#include "clang/Basic/LLVM.h"
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#include "clang/Basic/SourceLocation.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/None.h"
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#include "llvm/ADT/PointerUnion.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/TrailingObjects.h"
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#include <cassert>
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#include <iterator>
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namespace clang {
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class ASTContext;
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/// FriendDecl - Represents the declaration of a friend entity,
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/// which can be a function, a type, or a templated function or type.
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/// For example:
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///
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/// @code
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/// template <typename T> class A {
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///   friend int foo(T);
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///   friend class B;
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///   friend T; // only in C++0x
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///   template <typename U> friend class C;
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///   template <typename U> friend A& operator+=(A&, const U&) { ... }
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/// };
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/// @endcode
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///
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/// The semantic context of a friend decl is its declaring class.
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class FriendDecl final
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    : public Decl,
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      private llvm::TrailingObjects<FriendDecl, TemplateParameterList *> {
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  virtual void anchor();
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public:
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  using FriendUnion = llvm::PointerUnion<NamedDecl *, TypeSourceInfo *>;
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private:
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  friend class CXXRecordDecl;
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  friend class CXXRecordDecl::friend_iterator;
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  // The declaration that's a friend of this class.
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  FriendUnion Friend;
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  // A pointer to the next friend in the sequence.
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  LazyDeclPtr NextFriend;
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  // Location of the 'friend' specifier.
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  SourceLocation FriendLoc;
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  /// True if this 'friend' declaration is unsupported.  Eventually we
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  /// will support every possible friend declaration, but for now we
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  /// silently ignore some and set this flag to authorize all access.
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  unsigned UnsupportedFriend : 1;
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  // The number of "outer" template parameter lists in non-templatic
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  // (currently unsupported) friend type declarations, such as
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  //     template <class T> friend class A<T>::B;
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  unsigned NumTPLists : 31;
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  FriendDecl(DeclContext *DC, SourceLocation L, FriendUnion Friend,
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             SourceLocation FriendL,
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             ArrayRef<TemplateParameterList *> FriendTypeTPLists)
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      : Decl(Decl::Friend, DC, L), Friend(Friend), FriendLoc(FriendL),
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        UnsupportedFriend(false), NumTPLists(FriendTypeTPLists.size()) {
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    for (unsigned i = 0; i < NumTPLists; 
++i11
)
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      getTrailingObjects<TemplateParameterList *>()[i] = FriendTypeTPLists[i];
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  }
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  FriendDecl(EmptyShell Empty, unsigned NumFriendTypeTPLists)
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      : Decl(Decl::Friend, Empty), UnsupportedFriend(false),
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        NumTPLists(NumFriendTypeTPLists) {}
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  FriendDecl *getNextFriend() {
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    if (!NextFriend.isOffset())
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      return cast_or_null<FriendDecl>(NextFriend.get(nullptr));
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    return getNextFriendSlowCase();
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  }
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  FriendDecl *getNextFriendSlowCase();
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public:
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  friend class ASTDeclReader;
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  friend class ASTDeclWriter;
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  friend class ASTNodeImporter;
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  friend TrailingObjects;
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  static FriendDecl *Create(ASTContext &C, DeclContext *DC,
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                            SourceLocation L, FriendUnion Friend_,
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                            SourceLocation FriendL,
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                            ArrayRef<TemplateParameterList*> FriendTypeTPLists
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                            = None);
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  static FriendDecl *CreateDeserialized(ASTContext &C, unsigned ID,
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                                        unsigned FriendTypeNumTPLists);
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  /// If this friend declaration names an (untemplated but possibly
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  /// dependent) type, return the type; otherwise return null.  This
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  /// is used for elaborated-type-specifiers and, in C++0x, for
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  /// arbitrary friend type declarations.
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  TypeSourceInfo *getFriendType() const {
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    return Friend.dyn_cast<TypeSourceInfo*>();
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  }
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  unsigned getFriendTypeNumTemplateParameterLists() const {
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    return NumTPLists;
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  }
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  TemplateParameterList *getFriendTypeTemplateParameterList(unsigned N) const {
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    assert(N < NumTPLists);
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    return getTrailingObjects<TemplateParameterList *>()[N];
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  }
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  /// If this friend declaration doesn't name a type, return the inner
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  /// declaration.
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  NamedDecl *getFriendDecl() const {
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    return Friend.dyn_cast<NamedDecl *>();
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  }
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  /// Retrieves the location of the 'friend' keyword.
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  SourceLocation getFriendLoc() const {
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    return FriendLoc;
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  }
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  /// Retrieves the source range for the friend declaration.
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  SourceRange getSourceRange() const override LLVM_READONLY {
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    if (NamedDecl *ND = getFriendDecl()) {
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      if (const auto *FD = dyn_cast<FunctionDecl>(ND))
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        return FD->getSourceRange();
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      if (const auto *FTD = dyn_cast<FunctionTemplateDecl>(ND))
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        return FTD->getSourceRange();
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      if (const auto *CTD = dyn_cast<ClassTemplateDecl>(ND))
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        return CTD->getSourceRange();
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      if (const auto *DD = dyn_cast<DeclaratorDecl>(ND)) {
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        if (DD->getOuterLocStart() != DD->getInnerLocStart())
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          return DD->getSourceRange();
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      }
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      return SourceRange(getFriendLoc(), ND->getEndLoc());
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    }
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    else if (TypeSourceInfo *TInfo = getFriendType()) {
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      SourceLocation StartL =
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          (NumTPLists == 0) ? 
getFriendLoc()6.53k
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                            : getTrailingObjects<TemplateParameterList *>()[0]
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                                  ->getTemplateLoc();
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      return SourceRange(StartL, TInfo->getTypeLoc().getEndLoc());
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    }
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    else
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      return SourceRange(getFriendLoc(), getLocation());
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  }
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  /// Determines if this friend kind is unsupported.
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  bool isUnsupportedFriend() const {
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    return UnsupportedFriend;
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  }
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  void setUnsupportedFriend(bool Unsupported) {
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    UnsupportedFriend = Unsupported;
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  }
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  // Implement isa/cast/dyncast/etc.
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  static bool classof(const Decl *D) { return classofKind(D->getKind()); }
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  static bool classofKind(Kind K) { return K == Decl::Friend; }
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};
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/// An iterator over the friend declarations of a class.
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class CXXRecordDecl::friend_iterator {
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  friend class CXXRecordDecl;
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  FriendDecl *Ptr;
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  explicit friend_iterator(FriendDecl *Ptr) : Ptr(Ptr) {}
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public:
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  friend_iterator() = default;
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  using value_type = FriendDecl *;
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  using reference = FriendDecl *;
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  using pointer = FriendDecl *;
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  using difference_type = int;
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  using iterator_category = std::forward_iterator_tag;
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  reference operator*() const { return Ptr; }
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  friend_iterator &operator++() {
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    assert(Ptr && "attempt to increment past end of friend list");
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    Ptr = Ptr->getNextFriend();
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    return *this;
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  }
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  friend_iterator operator++(int) {
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    friend_iterator tmp = *this;
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    ++*this;
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    return tmp;
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  }
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  bool operator==(const friend_iterator &Other) const {
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    return Ptr == Other.Ptr;
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  }
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  bool operator!=(const friend_iterator &Other) const {
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    return Ptr != Other.Ptr;
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  }
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  friend_iterator &operator+=(difference_type N) {
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    assert(N >= 0 && "cannot rewind a CXXRecordDecl::friend_iterator");
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    while (N--)
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      ++*this;
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    return *this;
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  }
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  friend_iterator operator+(difference_type N) const {
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    friend_iterator tmp = *this;
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    tmp += N;
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    return tmp;
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  }
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};
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inline CXXRecordDecl::friend_iterator CXXRecordDecl::friend_begin() const {
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  return friend_iterator(getFirstFriend());
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}
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inline CXXRecordDecl::friend_iterator CXXRecordDecl::friend_end() const {
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  return friend_iterator(nullptr);
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}
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inline CXXRecordDecl::friend_range CXXRecordDecl::friends() const {
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  return friend_range(friend_begin(), friend_end());
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}
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inline void CXXRecordDecl::pushFriendDecl(FriendDecl *FD) {
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  assert(!FD->NextFriend && "friend already has next friend?");
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  FD->NextFriend = data().FirstFriend;
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  data().FirstFriend = FD;
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}
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} // namespace clang
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#endif // LLVM_CLANG_AST_DECLFRIEND_H