1 //===- ASTCommon.h - Common stuff for ASTReader/ASTWriter -*- C++ -*-=========//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file defines common functions that both ASTReader and ASTWriter use.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #ifndef LLVM_CLANG_LIB_SERIALIZATION_ASTCOMMON_H
14 #define LLVM_CLANG_LIB_SERIALIZATION_ASTCOMMON_H
15
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/DeclFriend.h"
18 #include "clang/Serialization/ASTBitCodes.h"
19
20 namespace clang {
21
22 namespace serialization {
23
24 enum DeclUpdateKind {
25 UPD_CXX_ADDED_IMPLICIT_MEMBER,
26 UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION,
27 UPD_CXX_ADDED_ANONYMOUS_NAMESPACE,
28 UPD_CXX_ADDED_FUNCTION_DEFINITION,
29 UPD_CXX_ADDED_VAR_DEFINITION,
30 UPD_CXX_POINT_OF_INSTANTIATION,
31 UPD_CXX_INSTANTIATED_CLASS_DEFINITION,
32 UPD_CXX_INSTANTIATED_DEFAULT_ARGUMENT,
33 UPD_CXX_INSTANTIATED_DEFAULT_MEMBER_INITIALIZER,
34 UPD_CXX_RESOLVED_DTOR_DELETE,
35 UPD_CXX_RESOLVED_EXCEPTION_SPEC,
36 UPD_CXX_DEDUCED_RETURN_TYPE,
37 UPD_DECL_MARKED_USED,
38 UPD_MANGLING_NUMBER,
39 UPD_STATIC_LOCAL_NUMBER,
40 UPD_DECL_MARKED_OPENMP_THREADPRIVATE,
41 UPD_DECL_MARKED_OPENMP_ALLOCATE,
42 UPD_DECL_MARKED_OPENMP_DECLARETARGET,
43 UPD_DECL_EXPORTED,
44 UPD_ADDED_ATTR_TO_RECORD
45 };
46
47 TypeIdx TypeIdxFromBuiltin(const BuiltinType *BT);
48
49 unsigned ComputeHash(Selector Sel);
50
51 /// Retrieve the "definitive" declaration that provides all of the
52 /// visible entries for the given declaration context, if there is one.
53 ///
54 /// The "definitive" declaration is the only place where we need to look to
55 /// find information about the declarations within the given declaration
56 /// context. For example, C++ and Objective-C classes, C structs/unions, and
57 /// Objective-C protocols, categories, and extensions are all defined in a
58 /// single place in the source code, so they have definitive declarations
59 /// associated with them. C++ namespaces, on the other hand, can have
60 /// multiple definitions.
61 const DeclContext *getDefinitiveDeclContext(const DeclContext *DC);
62
63 /// Determine whether the given declaration kind is redeclarable.
64 bool isRedeclarableDeclKind(unsigned Kind);
65
66 /// Determine whether the given declaration needs an anonymous
67 /// declaration number.
68 bool needsAnonymousDeclarationNumber(const NamedDecl *D);
69
70 /// Visit each declaration within \c DC that needs an anonymous
71 /// declaration number and call \p Visit with the declaration and its number.
numberAnonymousDeclsWithin(const DeclContext * DC,Fn Visit)72 template<typename Fn> void numberAnonymousDeclsWithin(const DeclContext *DC,
73 Fn Visit) {
74 unsigned Index = 0;
75 for (Decl *LexicalD : DC->decls()) {
76 // For a friend decl, we care about the declaration within it, if any.
77 if (auto *FD = dyn_cast<FriendDecl>(LexicalD))
78 LexicalD = FD->getFriendDecl();
79
80 auto *ND = dyn_cast_or_null<NamedDecl>(LexicalD);
81 if (!ND || !needsAnonymousDeclarationNumber(ND))
82 continue;
83
84 Visit(ND, Index++);
85 }
86 }
87
88 /// Determine whether the given declaration will be included in the per-module
89 /// initializer if it needs to be eagerly handed to the AST consumer. If so, we
90 /// should not hand it to the consumer when deserializing it, nor include it in
91 /// the list of eagerly deserialized declarations.
isPartOfPerModuleInitializer(const Decl * D)92 inline bool isPartOfPerModuleInitializer(const Decl *D) {
93 if (isa<ImportDecl>(D))
94 return true;
95 // Template instantiations are notionally in an "instantiation unit" rather
96 // than in any particular translation unit, so they need not be part of any
97 // particular (sub)module's per-module initializer.
98 if (auto *VD = dyn_cast<VarDecl>(D))
99 return !isTemplateInstantiation(VD->getTemplateSpecializationKind());
100 return false;
101 }
102
103 } // namespace serialization
104
105 } // namespace clang
106
107 #endif
108