clang  6.0.0svn
DeclAccessPair.h
Go to the documentation of this file.
1 //===--- DeclAccessPair.h - A decl bundled with its path access -*- 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 DeclAccessPair class, which provides an
11 // efficient representation of a pair of a NamedDecl* and an
12 // AccessSpecifier. Generally the access specifier gives the
13 // natural access of a declaration when named in a class, as
14 // defined in C++ [class.access.base]p1.
15 //
16 //===----------------------------------------------------------------------===//
17 
18 #ifndef LLVM_CLANG_AST_DECLACCESSPAIR_H
19 #define LLVM_CLANG_AST_DECLACCESSPAIR_H
20 
21 #include "clang/Basic/Specifiers.h"
22 #include "llvm/Support/DataTypes.h"
23 
24 namespace clang {
25 
26 class NamedDecl;
27 
28 /// A POD class for pairing a NamedDecl* with an access specifier.
29 /// Can be put into unions.
31  uintptr_t Ptr; // we'd use llvm::PointerUnion, but it isn't trivial
32 
33  enum { Mask = 0x3 };
34 
35 public:
38  p.set(D, AS);
39  return p;
40  }
41 
42  NamedDecl *getDecl() const {
43  return reinterpret_cast<NamedDecl*>(~Mask & Ptr);
44  }
46  return AccessSpecifier(Mask & Ptr);
47  }
48 
49  void setDecl(NamedDecl *D) {
50  set(D, getAccess());
51  }
53  set(getDecl(), AS);
54  }
55  void set(NamedDecl *D, AccessSpecifier AS) {
56  Ptr = uintptr_t(AS) | reinterpret_cast<uintptr_t>(D);
57  }
58 
59  operator NamedDecl*() const { return getDecl(); }
60  NamedDecl *operator->() const { return getDecl(); }
61 };
62 }
63 
64 // Take a moment to tell SmallVector that DeclAccessPair is POD.
65 namespace llvm {
66 template<typename> struct isPodLike;
67 template<> struct isPodLike<clang::DeclAccessPair> {
68  static const bool value = true;
69 };
70 }
71 
72 #endif
DominatorTree GraphTraits specialization so the DominatorTree can be iterable by generic graph iterat...
Definition: Dominators.h:26
NamedDecl * getDecl() const
AccessSpecifier
A C++ access specifier (public, private, protected), plus the special value "none" which means differ...
Definition: Specifiers.h:95
NamedDecl * operator->() const
static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS)
__UINTPTR_TYPE__ uintptr_t
An unsigned integer type with the property that any valid pointer to void can be converted to this ty...
Definition: opencl-c.h:82
void set(NamedDecl *D, AccessSpecifier AS)
AccessSpecifier getAccess() const
void setAccess(AccessSpecifier AS)
Defines various enumerations that describe declaration and type specifiers.
A POD class for pairing a NamedDecl* with an access specifier.
Dataflow Directional Tag Classes.
void setDecl(NamedDecl *D)
NamedDecl - This represents a decl with a name.
Definition: Decl.h:245