clang  6.0.0svn
UnresolvedSet.h
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1 //===- UnresolvedSet.h - Unresolved sets of declarations --------*- C++ -*-===//
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 defines the UnresolvedSet class, which is used to store
11 // collections of declarations in the AST.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_CLANG_AST_UNRESOLVEDSET_H
16 #define LLVM_CLANG_AST_UNRESOLVEDSET_H
17 
19 #include "clang/Basic/LLVM.h"
20 #include "clang/Basic/Specifiers.h"
21 #include "llvm/ADT/SmallVector.h"
22 #include "llvm/ADT/iterator.h"
23 #include <cstddef>
24 #include <iterator>
25 
26 namespace clang {
27 
28 class NamedDecl;
29 
30 /// The iterator over UnresolvedSets. Serves as both the const and
31 /// non-const iterator.
32 class UnresolvedSetIterator : public llvm::iterator_adaptor_base<
33  UnresolvedSetIterator, DeclAccessPair *,
34  std::random_access_iterator_tag, NamedDecl *,
35  std::ptrdiff_t, NamedDecl *, NamedDecl *> {
36  friend class ASTUnresolvedSet;
37  friend class OverloadExpr;
38  friend class UnresolvedSetImpl;
39 
41  : iterator_adaptor_base(Iter) {}
42  explicit UnresolvedSetIterator(const DeclAccessPair *Iter)
43  : iterator_adaptor_base(const_cast<DeclAccessPair *>(Iter)) {}
44 
45 public:
46  // Work around a bug in MSVC 2013 where explicitly default constructed
47  // temporaries with defaulted ctors are not zero initialized.
48  UnresolvedSetIterator() : iterator_adaptor_base(nullptr) {}
49 
50  NamedDecl *getDecl() const { return I->getDecl(); }
51  void setDecl(NamedDecl *ND) const { return I->setDecl(ND); }
52  AccessSpecifier getAccess() const { return I->getAccess(); }
53  void setAccess(AccessSpecifier AS) { I->setAccess(AS); }
54  const DeclAccessPair &getPair() const { return *I; }
55 
56  NamedDecl *operator*() const { return getDecl(); }
57  NamedDecl *operator->() const { return **this; }
58 };
59 
60 /// \brief A set of unresolved declarations.
63 
64  // Don't allow direct construction, and only permit subclassing by
65  // UnresolvedSet.
66 private:
67  template <unsigned N> friend class UnresolvedSet;
68 
69  UnresolvedSetImpl() = default;
70  UnresolvedSetImpl(const UnresolvedSetImpl &) = default;
71  UnresolvedSetImpl &operator=(const UnresolvedSetImpl &) = default;
72 
73  // FIXME: Switch these to "= default" once MSVC supports generating move ops
75  UnresolvedSetImpl &operator=(UnresolvedSetImpl &&) { return *this; }
76 
77 public:
78  // We don't currently support assignment through this iterator, so we might
79  // as well use the same implementation twice.
82 
83  iterator begin() { return iterator(decls().begin()); }
84  iterator end() { return iterator(decls().end()); }
85 
86  const_iterator begin() const { return const_iterator(decls().begin()); }
87  const_iterator end() const { return const_iterator(decls().end()); }
88 
89  void addDecl(NamedDecl *D) {
90  addDecl(D, AS_none);
91  }
92 
94  decls().push_back(DeclAccessPair::make(D, AS));
95  }
96 
97  /// Replaces the given declaration with the new one, once.
98  ///
99  /// \return true if the set changed
100  bool replace(const NamedDecl* Old, NamedDecl *New) {
101  for (DeclsTy::iterator I = decls().begin(), E = decls().end(); I != E; ++I)
102  if (I->getDecl() == Old)
103  return (I->setDecl(New), true);
104  return false;
105  }
106 
107  /// Replaces the declaration at the given iterator with the new one,
108  /// preserving the original access bits.
109  void replace(iterator I, NamedDecl *New) { I.I->setDecl(New); }
110 
112  I.I->set(New, AS);
113  }
114 
115  void erase(unsigned I) { decls()[I] = decls().pop_back_val(); }
116 
117  void erase(iterator I) { *I.I = decls().pop_back_val(); }
118 
119  void setAccess(iterator I, AccessSpecifier AS) { I.I->setAccess(AS); }
120 
121  void clear() { decls().clear(); }
122  void set_size(unsigned N) { decls().set_size(N); }
123 
124  bool empty() const { return decls().empty(); }
125  unsigned size() const { return decls().size(); }
126 
127  void append(iterator I, iterator E) { decls().append(I.I, E.I); }
128 
129  DeclAccessPair &operator[](unsigned I) { return decls()[I]; }
130  const DeclAccessPair &operator[](unsigned I) const { return decls()[I]; }
131 
132 private:
133  // These work because the only permitted subclass is UnresolvedSetImpl
134 
135  DeclsTy &decls() {
136  return *reinterpret_cast<DeclsTy*>(this);
137  }
138  const DeclsTy &decls() const {
139  return *reinterpret_cast<const DeclsTy*>(this);
140  }
141 };
142 
143 /// \brief A set of unresolved declarations.
144 template <unsigned InlineCapacity> class UnresolvedSet :
145  public UnresolvedSetImpl {
147 };
148 
149 
150 } // namespace clang
151 
152 #endif // LLVM_CLANG_AST_UNRESOLVEDSET_H
void replace(iterator I, NamedDecl *New)
Replaces the declaration at the given iterator with the new one, preserving the original access bits...
const DeclAccessPair & operator[](unsigned I) const
const_iterator begin() const
Definition: UnresolvedSet.h:86
void setAccess(iterator I, AccessSpecifier AS)
AccessSpecifier
A C++ access specifier (public, private, protected), plus the special value "none" which means differ...
Definition: Specifiers.h:95
void setAccess(AccessSpecifier AS)
Definition: UnresolvedSet.h:53
const DeclAccessPair & getPair() const
Definition: UnresolvedSet.h:54
void addDecl(NamedDecl *D, AccessSpecifier AS)
Definition: UnresolvedSet.h:93
The iterator over UnresolvedSets.
Definition: UnresolvedSet.h:32
NamedDecl * operator->() const
Definition: UnresolvedSet.h:57
void setDecl(NamedDecl *ND) const
Definition: UnresolvedSet.h:51
void replace(iterator I, NamedDecl *New, AccessSpecifier AS)
static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS)
void set_size(unsigned N)
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified...
AccessSpecifier getAccess() const
Definition: UnresolvedSet.h:52
A set of unresolved declarations.
Definition: UnresolvedSet.h:61
void append(iterator I, iterator E)
NamedDecl * operator*() const
Definition: UnresolvedSet.h:56
void erase(unsigned I)
bool replace(const NamedDecl *Old, NamedDecl *New)
Replaces the given declaration with the new one, once.
A reference to an overloaded function set, either an UnresolvedLookupExpr or an UnresolvedMemberExpr...
Definition: ExprCXX.h:2548
void addDecl(NamedDecl *D)
Definition: UnresolvedSet.h:89
NamedDecl * getDecl() const
Definition: UnresolvedSet.h:50
Defines various enumerations that describe declaration and type specifiers.
A POD class for pairing a NamedDecl* with an access specifier.
Dataflow Directional Tag Classes.
A set of unresolved declarations.
An UnresolvedSet-like class which uses the ASTContext&#39;s allocator.
const_iterator end() const
Definition: UnresolvedSet.h:87
void erase(iterator I)
unsigned size() const
NamedDecl - This represents a decl with a name.
Definition: Decl.h:245
void setAccess(AccessSpecifier AS)
Definition: DeclBase.h:455
DeclAccessPair & operator[](unsigned I)