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