clang  6.0.0svn
ASTCommon.h
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1 //===- ASTCommon.h - Common stuff for ASTReader/ASTWriter -*- 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 common functions that both ASTReader and ASTWriter use.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_CLANG_LIB_SERIALIZATION_ASTCOMMON_H
15 #define LLVM_CLANG_LIB_SERIALIZATION_ASTCOMMON_H
16 
17 #include "clang/AST/ASTContext.h"
18 #include "clang/AST/DeclFriend.h"
20 
21 namespace clang {
22 
23 namespace serialization {
24 
45 };
46 
48 
49 template <typename IdxForTypeTy>
50 TypeID MakeTypeID(ASTContext &Context, QualType T, IdxForTypeTy IdxForType) {
51  if (T.isNull())
52  return PREDEF_TYPE_NULL_ID;
53 
54  unsigned FastQuals = T.getLocalFastQualifiers();
56 
58  return IdxForType(T).asTypeID(FastQuals);
59 
60  assert(!T.hasLocalQualifiers());
61 
62  if (const BuiltinType *BT = dyn_cast<BuiltinType>(T.getTypePtr()))
63  return TypeIdxFromBuiltin(BT).asTypeID(FastQuals);
64 
65  if (T == Context.AutoDeductTy)
66  return TypeIdx(PREDEF_TYPE_AUTO_DEDUCT).asTypeID(FastQuals);
67  if (T == Context.AutoRRefDeductTy)
69 
70  return IdxForType(T).asTypeID(FastQuals);
71 }
72 
73 unsigned ComputeHash(Selector Sel);
74 
75 /// \brief Retrieve the "definitive" declaration that provides all of the
76 /// visible entries for the given declaration context, if there is one.
77 ///
78 /// The "definitive" declaration is the only place where we need to look to
79 /// find information about the declarations within the given declaration
80 /// context. For example, C++ and Objective-C classes, C structs/unions, and
81 /// Objective-C protocols, categories, and extensions are all defined in a
82 /// single place in the source code, so they have definitive declarations
83 /// associated with them. C++ namespaces, on the other hand, can have
84 /// multiple definitions.
86 
87 /// \brief Determine whether the given declaration kind is redeclarable.
88 bool isRedeclarableDeclKind(unsigned Kind);
89 
90 /// \brief Determine whether the given declaration needs an anonymous
91 /// declaration number.
93 
94 /// \brief Visit each declaration within \c DC that needs an anonymous
95 /// declaration number and call \p Visit with the declaration and its number.
96 template<typename Fn> void numberAnonymousDeclsWithin(const DeclContext *DC,
97  Fn Visit) {
98  unsigned Index = 0;
99  for (Decl *LexicalD : DC->decls()) {
100  // For a friend decl, we care about the declaration within it, if any.
101  if (auto *FD = dyn_cast<FriendDecl>(LexicalD))
102  LexicalD = FD->getFriendDecl();
103 
104  auto *ND = dyn_cast_or_null<NamedDecl>(LexicalD);
105  if (!ND || !needsAnonymousDeclarationNumber(ND))
106  continue;
107 
108  Visit(ND, Index++);
109  }
110 }
111 
112 } // namespace serialization
113 
114 } // namespace clang
115 
116 #endif
Defines the clang::ASTContext interface.
Smart pointer class that efficiently represents Objective-C method names.
bool isRedeclarableDeclKind(unsigned Kind)
Determine whether the given declaration kind is redeclarable.
Definition: ASTCommon.cpp:238
A (possibly-)qualified type.
Definition: Type.h:653
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:86
bool hasLocalNonFastQualifiers() const
Determine whether this particular QualType instance has any "non-fast" qualifiers, e.g., those that are stored in an ExtQualType instance.
Definition: Type.h:766
decl_range decls() const
decls_begin/decls_end - Iterate over the declarations stored in this context.
Definition: DeclBase.h:1576
const DeclContext * getDefinitiveDeclContext(const DeclContext *DC)
Retrieve the "definitive" declaration that provides all of the visible entries for the given declarat...
Definition: ASTCommon.cpp:179
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:149
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:5720
TypeID MakeTypeID(ASTContext &Context, QualType T, IdxForTypeTy IdxForType)
Definition: ASTCommon.h:50
unsigned getLocalFastQualifiers() const
Definition: Type.h:681
const FunctionProtoType * T
bool isNull() const
Return true if this QualType doesn&#39;t point to a type yet.
Definition: Type.h:719
Kind
TypeIdx TypeIdxFromBuiltin(const BuiltinType *BT)
Definition: ASTCommon.cpp:27
uint32_t TypeID
An ID number that refers to a type in an AST file.
Definition: ASTBitCodes.h:86
QualType AutoDeductTy
Definition: ASTContext.h:1026
unsigned ComputeHash(Selector Sel)
Definition: ASTCommon.cpp:167
Dataflow Directional Tag Classes.
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1252
TypeID asTypeID(unsigned FastQuals) const
Definition: ASTBitCodes.h:98
void removeLocalFastQualifiers()
Definition: Type.h:853
bool hasLocalQualifiers() const
Determine whether this particular QualType instance has any qualifiers, without looking through any t...
Definition: Type.h:756
QualType AutoRRefDeductTy
Definition: ASTContext.h:1027
bool needsAnonymousDeclarationNumber(const NamedDecl *D)
Determine whether the given declaration needs an anonymous declaration number.
Definition: ASTCommon.cpp:329
This class is used for builtin types like &#39;int&#39;.
Definition: Type.h:2145
NamedDecl - This represents a decl with a name.
Definition: Decl.h:245
void numberAnonymousDeclsWithin(const DeclContext *DC, Fn Visit)
Visit each declaration within DC that needs an anonymous declaration number and call Visit with the d...
Definition: ASTCommon.h:96
A type index; the type ID with the qualifier bits removed.
Definition: ASTBitCodes.h:89