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"
19 #include "clang/Serialization/ASTBitCodes.h"
20
21 namespace clang {
22
23 namespace serialization {
24
25 enum DeclUpdateKind {
26 UPD_CXX_ADDED_IMPLICIT_MEMBER,
27 UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION,
28 UPD_CXX_ADDED_ANONYMOUS_NAMESPACE,
29 UPD_CXX_ADDED_FUNCTION_DEFINITION,
30 UPD_CXX_INSTANTIATED_STATIC_DATA_MEMBER,
31 UPD_CXX_INSTANTIATED_CLASS_DEFINITION,
32 UPD_CXX_RESOLVED_DTOR_DELETE,
33 UPD_CXX_RESOLVED_EXCEPTION_SPEC,
34 UPD_CXX_DEDUCED_RETURN_TYPE,
35 UPD_DECL_MARKED_USED,
36 UPD_MANGLING_NUMBER,
37 UPD_STATIC_LOCAL_NUMBER,
38 UPD_DECL_MARKED_OPENMP_THREADPRIVATE,
39 UPD_DECL_EXPORTED
40 };
41
42 TypeIdx TypeIdxFromBuiltin(const BuiltinType *BT);
43
44 template <typename IdxForTypeTy>
MakeTypeID(ASTContext & Context,QualType T,IdxForTypeTy IdxForType)45 TypeID MakeTypeID(ASTContext &Context, QualType T, IdxForTypeTy IdxForType) {
46 if (T.isNull())
47 return PREDEF_TYPE_NULL_ID;
48
49 unsigned FastQuals = T.getLocalFastQualifiers();
50 T.removeLocalFastQualifiers();
51
52 if (T.hasLocalNonFastQualifiers())
53 return IdxForType(T).asTypeID(FastQuals);
54
55 assert(!T.hasLocalQualifiers());
56
57 if (const BuiltinType *BT = dyn_cast<BuiltinType>(T.getTypePtr()))
58 return TypeIdxFromBuiltin(BT).asTypeID(FastQuals);
59
60 if (T == Context.AutoDeductTy)
61 return TypeIdx(PREDEF_TYPE_AUTO_DEDUCT).asTypeID(FastQuals);
62 if (T == Context.AutoRRefDeductTy)
63 return TypeIdx(PREDEF_TYPE_AUTO_RREF_DEDUCT).asTypeID(FastQuals);
64 if (T == Context.VaListTagTy)
65 return TypeIdx(PREDEF_TYPE_VA_LIST_TAG).asTypeID(FastQuals);
66
67 return IdxForType(T).asTypeID(FastQuals);
68 }
69
70 unsigned ComputeHash(Selector Sel);
71
72 /// \brief Retrieve the "definitive" declaration that provides all of the
73 /// visible entries for the given declaration context, if there is one.
74 ///
75 /// The "definitive" declaration is the only place where we need to look to
76 /// find information about the declarations within the given declaration
77 /// context. For example, C++ and Objective-C classes, C structs/unions, and
78 /// Objective-C protocols, categories, and extensions are all defined in a
79 /// single place in the source code, so they have definitive declarations
80 /// associated with them. C++ namespaces, on the other hand, can have
81 /// multiple definitions.
82 const DeclContext *getDefinitiveDeclContext(const DeclContext *DC);
83
84 /// \brief Determine whether the given declaration kind is redeclarable.
85 bool isRedeclarableDeclKind(unsigned Kind);
86
87 /// \brief Determine whether the given declaration needs an anonymous
88 /// declaration number.
89 bool needsAnonymousDeclarationNumber(const NamedDecl *D);
90
91 /// \brief Visit each declaration within \c DC that needs an anonymous
92 /// declaration number and call \p Visit with the declaration and its number.
numberAnonymousDeclsWithin(const DeclContext * DC,Fn Visit)93 template<typename Fn> void numberAnonymousDeclsWithin(const DeclContext *DC,
94 Fn Visit) {
95 unsigned Index = 0;
96 for (Decl *LexicalD : DC->decls()) {
97 // For a friend decl, we care about the declaration within it, if any.
98 if (auto *FD = dyn_cast<FriendDecl>(LexicalD))
99 LexicalD = FD->getFriendDecl();
100
101 auto *ND = dyn_cast_or_null<NamedDecl>(LexicalD);
102 if (!ND || !needsAnonymousDeclarationNumber(ND))
103 continue;
104
105 Visit(ND, Index++);
106 }
107 }
108
109 } // namespace serialization
110
111 } // namespace clang
112
113 #endif
114