ASTCommon.h revision 263508 
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  UPD_DECL_MARKED_USED
31};
32
33TypeIdx TypeIdxFromBuiltin(const BuiltinType *BT);
34
35template <typename IdxForTypeTy>
36TypeID MakeTypeID(ASTContext &Context, QualType T, IdxForTypeTy IdxForType) {
37  if (T.isNull())
38    return PREDEF_TYPE_NULL_ID;
39
40  unsigned FastQuals = T.getLocalFastQualifiers();
41  T.removeLocalFastQualifiers();
42
43  if (T.hasLocalNonFastQualifiers())
44    return IdxForType(T).asTypeID(FastQuals);
45
46  assert(!T.hasLocalQualifiers());
47
48  if (const BuiltinType *BT = dyn_cast<BuiltinType>(T.getTypePtr()))
49    return TypeIdxFromBuiltin(BT).asTypeID(FastQuals);
50
51  if (T == Context.AutoDeductTy)
52    return TypeIdx(PREDEF_TYPE_AUTO_DEDUCT).asTypeID(FastQuals);
53  if (T == Context.AutoRRefDeductTy)
54    return TypeIdx(PREDEF_TYPE_AUTO_RREF_DEDUCT).asTypeID(FastQuals);
55  if (T == Context.VaListTagTy)
56    return TypeIdx(PREDEF_TYPE_VA_LIST_TAG).asTypeID(FastQuals);
57
58  return IdxForType(T).asTypeID(FastQuals);
59}
60
61unsigned ComputeHash(Selector Sel);
62
63/// \brief Retrieve the "definitive" declaration that provides all of the
64/// visible entries for the given declaration context, if there is one.
65///
66/// The "definitive" declaration is the only place where we need to look to
67/// find information about the declarations within the given declaration
68/// context. For example, C++ and Objective-C classes, C structs/unions, and
69/// Objective-C protocols, categories, and extensions are all defined in a
70/// single place in the source code, so they have definitive declarations
71/// associated with them. C++ namespaces, on the other hand, can have
72/// multiple definitions.
73const DeclContext *getDefinitiveDeclContext(const DeclContext *DC);
74
75/// \brief Determine whether the given declaration kind is redeclarable.
76bool isRedeclarableDeclKind(unsigned Kind);
77
78} // namespace serialization
79
80} // namespace clang
81
82#endif
83