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      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 
     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_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 
     38 TypeIdx TypeIdxFromBuiltin(const BuiltinType *BT);
     39 
     40 template <typename IdxForTypeTy>
     41 TypeID 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 
     66 unsigned 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.
     78 const DeclContext *getDefinitiveDeclContext(const DeclContext *DC);
     79 
     80 /// \brief Determine whether the given declaration kind is redeclarable.
     81 bool isRedeclarableDeclKind(unsigned Kind);
     82 
     83 } // namespace serialization
     84 
     85 } // namespace clang
     86 
     87 #endif
     88