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_SERIALIZATION_LIB_AST_COMMON_H
15#define LLVM_CLANG_SERIALIZATION_LIB_AST_COMMON_H
16
17#include "clang/AST/ASTContext.h"
18#include "clang/Serialization/ASTBitCodes.h"
19
20namespace clang {
21
22namespace serialization {
23
24enum DeclUpdateKind {
25  UPD_CXX_ADDED_IMPLICIT_MEMBER,
26  UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION,
27  UPD_CXX_ADDED_ANONYMOUS_NAMESPACE,
28  UPD_CXX_INSTANTIATED_STATIC_DATA_MEMBER,
29  UPD_CXX_DEDUCED_RETURN_TYPE
30};
31
32TypeIdx TypeIdxFromBuiltin(const BuiltinType *BT);
33
34template <typename IdxForTypeTy>
35TypeID MakeTypeID(ASTContext &Context, QualType T, IdxForTypeTy IdxForType) {
36  if (T.isNull())
37    return PREDEF_TYPE_NULL_ID;
38
39  unsigned FastQuals = T.getLocalFastQualifiers();
40  T.removeLocalFastQualifiers();
41
42  if (T.hasLocalNonFastQualifiers())
43    return IdxForType(T).asTypeID(FastQuals);
44
45  assert(!T.hasLocalQualifiers());
46
47  if (const BuiltinType *BT = dyn_cast<BuiltinType>(T.getTypePtr()))
48    return TypeIdxFromBuiltin(BT).asTypeID(FastQuals);
49
50  if (T == Context.AutoDeductTy)
51    return TypeIdx(PREDEF_TYPE_AUTO_DEDUCT).asTypeID(FastQuals);
52  if (T == Context.AutoRRefDeductTy)
53    return TypeIdx(PREDEF_TYPE_AUTO_RREF_DEDUCT).asTypeID(FastQuals);
54  if (T == Context.VaListTagTy)
55    return TypeIdx(PREDEF_TYPE_VA_LIST_TAG).asTypeID(FastQuals);
56
57  return IdxForType(T).asTypeID(FastQuals);
58}
59
60unsigned ComputeHash(Selector Sel);
61
62/// \brief Retrieve the "definitive" declaration that provides all of the
63/// visible entries for the given declaration context, if there is one.
64///
65/// The "definitive" declaration is the only place where we need to look to
66/// find information about the declarations within the given declaration
67/// context. For example, C++ and Objective-C classes, C structs/unions, and
68/// Objective-C protocols, categories, and extensions are all defined in a
69/// single place in the source code, so they have definitive declarations
70/// associated with them. C++ namespaces, on the other hand, can have
71/// multiple definitions.
72const DeclContext *getDefinitiveDeclContext(const DeclContext *DC);
73
74/// \brief Determine whether the given declaration kind is redeclarable.
75bool isRedeclarableDeclKind(unsigned Kind);
76
77} // namespace serialization
78
79} // namespace clang
80
81#endif
82