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_INSTANTIATED_FUNCTION_DEFINITION,
30  UPD_CXX_INSTANTIATED_CLASS_DEFINITION,
31  UPD_CXX_RESOLVED_EXCEPTION_SPEC,
32  UPD_CXX_DEDUCED_RETURN_TYPE,
33  UPD_DECL_MARKED_USED,
34  UPD_MANGLING_NUMBER,
35  UPD_STATIC_LOCAL_NUMBER
36};
37
38TypeIdx TypeIdxFromBuiltin(const BuiltinType *BT);
39
40template <typename IdxForTypeTy>
41TypeID MakeTypeID(ASTContext &Context, QualType T, IdxForTypeTy IdxForType) {
42  if (T.isNull())
43    return PREDEF_TYPE_NULL_ID;
44
45  unsigned FastQuals = T.getLocalFastQualifiers();
46  T.removeLocalFastQualifiers();
47
48  if (T.hasLocalNonFastQualifiers())
49    return IdxForType(T).asTypeID(FastQuals);
50
51  assert(!T.hasLocalQualifiers());
52
53  if (const BuiltinType *BT = dyn_cast<BuiltinType>(T.getTypePtr()))
54    return TypeIdxFromBuiltin(BT).asTypeID(FastQuals);
55
56  if (T == Context.AutoDeductTy)
57    return TypeIdx(PREDEF_TYPE_AUTO_DEDUCT).asTypeID(FastQuals);
58  if (T == Context.AutoRRefDeductTy)
59    return TypeIdx(PREDEF_TYPE_AUTO_RREF_DEDUCT).asTypeID(FastQuals);
60  if (T == Context.VaListTagTy)
61    return TypeIdx(PREDEF_TYPE_VA_LIST_TAG).asTypeID(FastQuals);
62
63  return IdxForType(T).asTypeID(FastQuals);
64}
65
66unsigned ComputeHash(Selector Sel);
67
68/// \brief Retrieve the "definitive" declaration that provides all of the
69/// visible entries for the given declaration context, if there is one.
70///
71/// The "definitive" declaration is the only place where we need to look to
72/// find information about the declarations within the given declaration
73/// context. For example, C++ and Objective-C classes, C structs/unions, and
74/// Objective-C protocols, categories, and extensions are all defined in a
75/// single place in the source code, so they have definitive declarations
76/// associated with them. C++ namespaces, on the other hand, can have
77/// multiple definitions.
78const DeclContext *getDefinitiveDeclContext(const DeclContext *DC);
79
80/// \brief Determine whether the given declaration kind is redeclarable.
81bool isRedeclarableDeclKind(unsigned Kind);
82
83} // namespace serialization
84
85} // namespace clang
86
87#endif
88