[NFC] [Serialization] Use semantical type DeclID instead of raw type 'uint32_t'

This patch tries to use DeclID in the code bases to avoid use the raw
type 'uint32_t'. It is problematic to use the raw type 'uint32_t' if we
want to change the type of DeclID some day.

Author: ChuanqiXu9

clang/include/clang/AST/ASTContext.h

@@ -455,7 +455,7 @@ class ASTContext : public RefCountedBase<ASTContext> {
   /// initialization of another module).
   struct PerModuleInitializers {
     llvm::SmallVector<Decl*, 4> Initializers;
-    llvm::SmallVector<uint32_t, 4> LazyInitializers;
+    llvm::SmallVector<Decl::DeclID, 4> LazyInitializers;
 
     void resolve(ASTContext &Ctx);
   };
@@ -1059,7 +1059,7 @@ class ASTContext : public RefCountedBase<ASTContext> {
   /// or an ImportDecl nominating another module that has initializers.
   void addModuleInitializer(Module *M, Decl *Init);
 
-  void addLazyModuleInitializers(Module *M, ArrayRef<uint32_t> IDs);
+  void addLazyModuleInitializers(Module *M, ArrayRef<Decl::DeclID> IDs);
 
   /// Get the initializations to perform when importing a module, if any.
   ArrayRef<Decl*> getModuleInitializers(Module *M);

clang/include/clang/AST/DeclBase.h

@@ -239,6 +239,9 @@ class alignas(8) Decl {
     ModulePrivate
   };
 
+  /// An ID number that refers to a declaration in an AST file.
+  using DeclID = uint32_t;
+
 protected:
   /// The next declaration within the same lexical
   /// DeclContext. These pointers form the linked list that is
@@ -349,8 +352,6 @@ class alignas(8) Decl {
   LLVM_PREFERRED_TYPE(Linkage)
   mutable unsigned CacheValidAndLinkage : 3;
 
-  using DeclID = uint32_t;
-
   /// Allocate memory for a deserialized declaration.
   ///
   /// This routine must be used to allocate memory for any declaration that is
@@ -778,9 +779,9 @@ class alignas(8) Decl {
 
   /// Retrieve the global declaration ID associated with this
   /// declaration, which specifies where this Decl was loaded from.
-  unsigned getGlobalID() const {
+  DeclID getGlobalID() const {
     if (isFromASTFile())
-      return *((const unsigned*)this - 1);
+      return *((const DeclID *)this - 1);
     return 0;
   }
 

clang/include/clang/AST/DeclTemplate.h

@@ -797,7 +797,7 @@ class RedeclarableTemplateDecl : public TemplateDecl,
     ///
     /// The first value in the array is the number of specializations/partial
     /// specializations that follow.
-    uint32_t *LazySpecializations = nullptr;
+    Decl::DeclID *LazySpecializations = nullptr;
 
     /// The set of "injected" template arguments used within this
     /// template.

clang/include/clang/AST/ExternalASTSource.h

@@ -99,7 +99,7 @@ class ExternalASTSource : public RefCountedBase<ExternalASTSource> {
   /// passes back decl sets as VisibleDeclaration objects.
   ///
   /// The default implementation of this method is a no-op.
-  virtual Decl *GetExternalDecl(uint32_t ID);
+  virtual Decl *GetExternalDecl(Decl::DeclID ID);
 
   /// Resolve a selector ID into a selector.
   ///
@@ -579,7 +579,7 @@ using LazyDeclStmtPtr =
 
 /// A lazy pointer to a declaration.
 using LazyDeclPtr =
-    LazyOffsetPtr<Decl, uint32_t, &ExternalASTSource::GetExternalDecl>;
+    LazyOffsetPtr<Decl, Decl::DeclID, &ExternalASTSource::GetExternalDecl>;
 
 /// A lazy pointer to a set of CXXCtorInitializers.
 using LazyCXXCtorInitializersPtr =

clang/include/clang/Sema/MultiplexExternalSemaSource.h

@@ -65,7 +65,7 @@ class MultiplexExternalSemaSource : public ExternalSemaSource {
 
   /// Resolve a declaration ID into a declaration, potentially
   /// building a new declaration.
-  Decl *GetExternalDecl(uint32_t ID) override;
+  Decl *GetExternalDecl(Decl::DeclID ID) override;
 
   /// Complete the redeclaration chain if it's been extended since the
   /// previous generation of the AST source.

clang/include/clang/Serialization/ASTBitCodes.h

@@ -65,6 +65,8 @@ using IdentifierID = uint32_t;
 /// discovery), with values below NUM_PREDEF_DECL_IDS being reserved.
 /// At the start of a chain of precompiled headers, declaration ID 1 is
 /// used for the translation unit declaration.
+///
+/// FIXME: Merge with Decl::DeclID
 using DeclID = uint32_t;
 
 // FIXME: Turn these into classes so we can have some type safety when

clang/include/clang/Serialization/ASTReader.h

@@ -606,7 +606,11 @@ class ASTReader
 
   /// An array of lexical contents of a declaration context, as a sequence of
   /// Decl::Kind, DeclID pairs.
-  using LexicalContents = ArrayRef<llvm::support::unaligned_uint32_t>;
+  using unalighed_decl_id_t =
+      llvm::support::detail::packed_endian_specific_integral<
+          serialization::DeclID, llvm::endianness::native,
+          llvm::support::unaligned>;
+  using LexicalContents = ArrayRef<unalighed_decl_id_t>;
 
   /// Map from a DeclContext to its lexical contents.
   llvm::DenseMap<const DeclContext*, std::pair<ModuleFile*, LexicalContents>>
@@ -1093,8 +1097,8 @@ class ASTReader
   ///
   /// The declarations on the identifier chain for these identifiers will be
   /// loaded once the recursive loading has completed.
-  llvm::MapVector<IdentifierInfo *, SmallVector<uint32_t, 4>>
-    PendingIdentifierInfos;
+  llvm::MapVector<IdentifierInfo *, SmallVector<serialization::DeclID, 4>>
+      PendingIdentifierInfos;
 
   /// The set of lookup results that we have faked in order to support
   /// merging of partially deserialized decls but that we have not yet removed.
@@ -1913,22 +1917,22 @@ class ASTReader
   /// Resolve a declaration ID into a declaration, potentially
   /// building a new declaration.
   Decl *GetDecl(serialization::DeclID ID);
-  Decl *GetExternalDecl(uint32_t ID) override;
+  Decl *GetExternalDecl(serialization::DeclID ID) override;
 
   /// Resolve a declaration ID into a declaration. Return 0 if it's not
   /// been loaded yet.
   Decl *GetExistingDecl(serialization::DeclID ID);
 
   /// Reads a declaration with the given local ID in the given module.
-  Decl *GetLocalDecl(ModuleFile &F, uint32_t LocalID) {
+  Decl *GetLocalDecl(ModuleFile &F, serialization::DeclID LocalID) {
     return GetDecl(getGlobalDeclID(F, LocalID));
   }
 
   /// Reads a declaration with the given local ID in the given module.
   ///
   /// \returns The requested declaration, casted to the given return type.
-  template<typename T>
-  T *GetLocalDeclAs(ModuleFile &F, uint32_t LocalID) {
+  template <typename T>
+  T *GetLocalDeclAs(ModuleFile &F, serialization::DeclID LocalID) {
     return cast_or_null<T>(GetLocalDecl(F, LocalID));
   }
 
@@ -2120,9 +2124,10 @@ class ASTReader
   void LoadSelector(Selector Sel);
 
   void SetIdentifierInfo(unsigned ID, IdentifierInfo *II);
-  void SetGloballyVisibleDecls(IdentifierInfo *II,
-                               const SmallVectorImpl<uint32_t> &DeclIDs,
-                               SmallVectorImpl<Decl *> *Decls = nullptr);
+  void
+  SetGloballyVisibleDecls(IdentifierInfo *II,
+                          const SmallVectorImpl<serialization::DeclID> &DeclIDs,
+                          SmallVectorImpl<Decl *> *Decls = nullptr);
 
   /// Report a diagnostic.
   DiagnosticBuilder Diag(unsigned DiagID) const;

clang/include/clang/Serialization/ASTRecordReader.h

@@ -143,8 +143,7 @@ class ASTRecordReader
   /// Reads a declaration with the given local ID in the given module.
   ///
   /// \returns The requested declaration, casted to the given return type.
-  template<typename T>
-  T *GetLocalDeclAs(uint32_t LocalID) {
+  template <typename T> T *GetLocalDeclAs(serialization::LocalDeclID LocalID) {
     return cast_or_null<T>(Reader->GetLocalDecl(*F, LocalID));
   }
 

clang/include/clang/Serialization/ModuleFile.h

@@ -462,7 +462,7 @@ class ModuleFile {
   serialization::DeclID BaseDeclID = 0;
 
   /// Remapping table for declaration IDs in this module.
-  ContinuousRangeMap<uint32_t, int, 2> DeclRemap;
+  ContinuousRangeMap<serialization::DeclID, int, 2> DeclRemap;
 
   /// Mapping from the module files that this module file depends on
   /// to the base declaration ID for that module as it is understood within this

clang/lib/AST/ASTContext.cpp

@@ -1083,7 +1083,8 @@ void ASTContext::addModuleInitializer(Module *M, Decl *D) {
   Inits->Initializers.push_back(D);
 }
 
-void ASTContext::addLazyModuleInitializers(Module *M, ArrayRef<uint32_t> IDs) {
+void ASTContext::addLazyModuleInitializers(Module *M,
+                                           ArrayRef<Decl::DeclID> IDs) {
   auto *&Inits = ModuleInitializers[M];
   if (!Inits)
     Inits = new (*this) PerModuleInitializers;

clang/lib/AST/DeclTemplate.cpp

@@ -337,7 +337,7 @@ void RedeclarableTemplateDecl::loadLazySpecializationsImpl() const {
   CommonBase *CommonBasePtr = getMostRecentDecl()->getCommonPtr();
   if (CommonBasePtr->LazySpecializations) {
     ASTContext &Context = getASTContext();
-    uint32_t *Specs = CommonBasePtr->LazySpecializations;
+    Decl::DeclID *Specs = CommonBasePtr->LazySpecializations;
     CommonBasePtr->LazySpecializations = nullptr;
     for (uint32_t I = 0, N = *Specs++; I != N; ++I)
       (void)Context.getExternalSource()->GetExternalDecl(Specs[I]);

clang/lib/AST/ExternalASTSource.cpp

@@ -68,9 +68,7 @@ bool ExternalASTSource::layoutRecordType(
   return false;
 }
 
-Decl *ExternalASTSource::GetExternalDecl(uint32_t ID) {
-  return nullptr;
-}
+Decl *ExternalASTSource::GetExternalDecl(Decl::DeclID ID) { return nullptr; }
 
 Selector ExternalASTSource::GetExternalSelector(uint32_t ID) {
   return Selector();

clang/lib/Sema/MultiplexExternalSemaSource.cpp

@@ -46,7 +46,7 @@ void MultiplexExternalSemaSource::AddSource(ExternalSemaSource *Source) {
 // ExternalASTSource.
 //===----------------------------------------------------------------------===//
 
-Decl *MultiplexExternalSemaSource::GetExternalDecl(uint32_t ID) {
+Decl *MultiplexExternalSemaSource::GetExternalDecl(Decl::DeclID ID) {
   for(size_t i = 0; i < Sources.size(); ++i)
     if (Decl *Result = Sources[i]->GetExternalDecl(ID))
       return Result;

clang/lib/Serialization/ASTReader.cpp

@@ -954,14 +954,14 @@ ASTSelectorLookupTrait::ReadData(Selector, const unsigned char* d,
   // Load instance methods
   for (unsigned I = 0; I != NumInstanceMethods; ++I) {
     if (ObjCMethodDecl *Method = Reader.GetLocalDeclAs<ObjCMethodDecl>(
-            F, endian::readNext<uint32_t, llvm::endianness::little>(d)))
+            F, endian::readNext<DeclID, llvm::endianness::little>(d)))
       Result.Instance.push_back(Method);
   }
 
   // Load factory methods
   for (unsigned I = 0; I != NumFactoryMethods; ++I) {
     if (ObjCMethodDecl *Method = Reader.GetLocalDeclAs<ObjCMethodDecl>(
-            F, endian::readNext<uint32_t, llvm::endianness::little>(d)))
+            F, endian::readNext<DeclID, llvm::endianness::little>(d)))
       Result.Factory.push_back(Method);
   }
 
@@ -1088,10 +1088,10 @@ IdentifierInfo *ASTIdentifierLookupTrait::ReadData(const internal_key_type& k,
   // Read all of the declarations visible at global scope with this
   // name.
   if (DataLen > 0) {
-    SmallVector<uint32_t, 4> DeclIDs;
-    for (; DataLen > 0; DataLen -= 4)
+    SmallVector<DeclID, 4> DeclIDs;
+    for (; DataLen > 0; DataLen -= sizeof(DeclID))
       DeclIDs.push_back(Reader.getGlobalDeclID(
-          F, endian::readNext<uint32_t, llvm::endianness::little>(d)));
+          F, endian::readNext<DeclID, llvm::endianness::little>(d)));
     Reader.SetGloballyVisibleDecls(II, DeclIDs);
   }
 
@@ -1211,8 +1211,8 @@ void ASTDeclContextNameLookupTrait::ReadDataInto(internal_key_type,
                                                  data_type_builder &Val) {
   using namespace llvm::support;
 
-  for (unsigned NumDecls = DataLen / 4; NumDecls; --NumDecls) {
-    uint32_t LocalID = endian::readNext<uint32_t, llvm::endianness::little>(d);
+  for (unsigned NumDecls = DataLen / sizeof(DeclID); NumDecls; --NumDecls) {
+    DeclID LocalID = endian::readNext<DeclID, llvm::endianness::little>(d);
     Val.insert(Reader.getGlobalDeclID(F, LocalID));
   }
 }
@@ -1259,9 +1259,8 @@ bool ASTReader::ReadLexicalDeclContextStorage(ModuleFile &M,
   if (!Lex.first) {
     Lex = std::make_pair(
         &M, llvm::ArrayRef(
-                reinterpret_cast<const llvm::support::unaligned_uint32_t *>(
-                    Blob.data()),
-                Blob.size() / 4));
+                reinterpret_cast<const unalighed_decl_id_t *>(Blob.data()),
+                Blob.size() / sizeof(DeclID)));
   }
   DC->setHasExternalLexicalStorage(true);
   return false;
@@ -3389,9 +3388,8 @@ llvm::Error ASTReader::ReadASTBlock(ModuleFile &F,
     case TU_UPDATE_LEXICAL: {
       DeclContext *TU = ContextObj->getTranslationUnitDecl();
       LexicalContents Contents(
-          reinterpret_cast<const llvm::support::unaligned_uint32_t *>(
-              Blob.data()),
-          static_cast<unsigned int>(Blob.size() / 4));
+          reinterpret_cast<const unalighed_decl_id_t *>(Blob.data()),
+          static_cast<unsigned int>(Blob.size() / sizeof(DeclID)));
       TULexicalDecls.push_back(std::make_pair(&F, Contents));
       TU->setHasExternalLexicalStorage(true);
       break;
@@ -6010,7 +6008,7 @@ llvm::Error ASTReader::ReadSubmoduleBlock(ModuleFile &F,
     case SUBMODULE_INITIALIZERS: {
       if (!ContextObj)
         break;
-      SmallVector<uint32_t, 16> Inits;
+      SmallVector<DeclID, 16> Inits;
       for (auto &ID : Record)
         Inits.push_back(getGlobalDeclID(F, ID));
       ContextObj->addLazyModuleInitializers(CurrentModule, Inits);
@@ -7517,9 +7515,7 @@ ASTRecordReader::readASTTemplateArgumentListInfo() {
   return ASTTemplateArgumentListInfo::Create(getContext(), Result);
 }
 
-Decl *ASTReader::GetExternalDecl(uint32_t ID) {
-  return GetDecl(ID);
-}
+Decl *ASTReader::GetExternalDecl(DeclID ID) { return GetDecl(ID); }
 
 void ASTReader::CompleteRedeclChain(const Decl *D) {
   if (NumCurrentElementsDeserializing) {
@@ -7660,8 +7656,8 @@ ASTReader::getGlobalDeclID(ModuleFile &F, LocalDeclID LocalID) const {
   if (!F.ModuleOffsetMap.empty())
     ReadModuleOffsetMap(F);
 
-  ContinuousRangeMap<uint32_t, int, 2>::iterator I
-    = F.DeclRemap.find(LocalID - NUM_PREDEF_DECL_IDS);
+  ContinuousRangeMap<DeclID, int, 2>::iterator I =
+      F.DeclRemap.find(LocalID - NUM_PREDEF_DECL_IDS);
   assert(I != F.DeclRemap.end() && "Invalid index into decl index remap");
 
   return LocalID + I->second;
@@ -8833,10 +8829,9 @@ void ASTReader::SetIdentifierInfo(IdentifierID ID, IdentifierInfo *II) {
 /// \param Decls if non-null, this vector will be populated with the set of
 /// deserialized declarations. These declarations will not be pushed into
 /// scope.
-void
-ASTReader::SetGloballyVisibleDecls(IdentifierInfo *II,
-                              const SmallVectorImpl<uint32_t> &DeclIDs,
-                                   SmallVectorImpl<Decl *> *Decls) {
+void ASTReader::SetGloballyVisibleDecls(IdentifierInfo *II,
+                                        const SmallVectorImpl<DeclID> &DeclIDs,
+                                        SmallVectorImpl<Decl *> *Decls) {
   if (NumCurrentElementsDeserializing && !Decls) {
     PendingIdentifierInfos[II].append(DeclIDs.begin(), DeclIDs.end());
     return;
@@ -9560,7 +9555,7 @@ void ASTReader::finishPendingActions() {
 
     while (!PendingIdentifierInfos.empty()) {
       IdentifierInfo *II = PendingIdentifierInfos.back().first;
-      SmallVector<uint32_t, 4> DeclIDs =
+      SmallVector<DeclID, 4> DeclIDs =
           std::move(PendingIdentifierInfos.back().second);
       PendingIdentifierInfos.pop_back();
 

clang/lib/Serialization/ASTReaderDecl.cpp

@@ -3140,7 +3140,7 @@ class AttrReader {
 
   OMPTraitInfo *readOMPTraitInfo() { return Reader.readOMPTraitInfo(); }
 
-  template <typename T> T *GetLocalDeclAs(uint32_t LocalID) {
+  template <typename T> T *GetLocalDeclAs(DeclID LocalID) {
     return Reader.GetLocalDeclAs<T>(LocalID);
   }
 };