[NFCI]Create CommonAttributeInfo Type as base type of *Attr and ParsedAttr.

[erichkeane]

Summary

In order to enable future improvements to our attribute diagnostics,
this moves info from ParsedAttr into CommonAttributeInfo, then makes
this type the base of the *Attr and ParsedAttr types. Quite a bit of
refactoring took place, including removing a bunch of redundant Spelling
Index propogation.

[aaron.ballman]

Thank you for doing all this work -- in general, this is looking great and really cleans things up!

clang/include/clang/Basic/Attr.td

2266

I'm surprised to see this as part of an NFC refactoring. Hopefully it will become more obvious later. :-D

clang/include/clang/Basic/AttributeCommonInfo.h

66–69

Do you want to do = 0 here to give them in-class initializers? (well, SpellingIndex should probably be SpellingNotCalculated).

clang/include/clang/Lex/Preprocessor.h

373

Can you correct the order in the comment to be the same as the order in the pair?

clang/lib/CodeGen/CGOpenMPRuntimeNVPTX.cpp

298–300

I'm surprised we'd give a parse syntax to an implicit attribute. Wouldn't we rather note that these have no associated syntax or spelling?

clang/lib/Sema/SemaAttr.cpp

892

Spurious change?

clang/lib/Sema/SemaDecl.cpp

8962–8965

It would be nice if we didn't have to repeat information, if possible. The previous version of this didn't need to specify AT_NoReturn because the C11NoReturnAttr was sufficient to glean that information. It would be awesome if we could find a way to make this more succinct. Perhaps ConcreteAttr::Create(Context, Range, Syntax, Spelling = DefaultValue) or something along those lines?

13880

Spurious formatting change? Same for the next three changes.

clang/lib/Sema/SemaDeclCXX.cpp

3349

Can we use something other than UnknownAttribute here? That implies we don't know the spelling of the attribute name, which seems wrong.

clang/lib/Sema/SemaDeclObjC.cpp

4464–4465

Spurious formatting change.

clang/lib/Sema/SemaObjCProperty.cpp

2414–2415

I'll stop pointing out the formatting changes, but you should probably drop these from the patch.

clang/lib/Sema/SemaStmtAttr.cpp

50

Thank you for this change. I have no idea how the original code made it through a code review.

clang/lib/Sema/SemaType.cpp

3942

Since you're touching this code already... can you rename Attr to not conflict with a type name? :-D

clang/lib/Serialization/ASTReaderDecl.cpp

56

Is this still needed?

clang/lib/Serialization/ASTWriter.cpp

4526

Do we also need bump an AST binary format version number for this sort of change?

[erichkeane]

I think I've changed everything @aaron.ballman suggested. Despite the size of this patch, it actually removes ~1020 lines of code!

[erichkeane]

clang/include/clang/Basic/Attr.td

2266

Yep, was a separate bug I found while going through things. I'll take it out and do it later.

clang/include/clang/Basic/AttributeCommonInfo.h

66–69

Bitfield in-class initializers are a C++2a feature.

[aaron.ballman]

LGTM! Thank you for this refactoring -- it was large, but I think the results from it are really good.

clang/include/clang/Basic/AttributeCommonInfo.h

66–69

Details. Invent a time machine and add this to C++14. ;-)

[plotfi]

This comment was removed by plotfi.

[plotfi]

I think this change might be breaking builds: http://lab.llvm.org:8011/builders/clang-aarch64-linux-build-cache/builds/16888

[erichkeane]

In D67368#1669818, @plotfi wrote:

I think this change might be breaking builds: http://lab.llvm.org:8011/builders/clang-aarch64-linux-build-cache/builds/16888

Yep! I fixed it in r371876.

[MaskRay]

cfe/trunk/include/clang/Basic/AttributeCommonInfo.h

166 ↗

(On Diff #220143)

calculateAttributeSpellingListIndex is defined in clangSema. This can cause lib/libclangAST.so.10svn (-DBUILD_SHARED_LIBS=on) fail to link:

ld.lld: error: undefined symbol: clang::AttributeCommonInfo::calculateAttributeSpellingListIndex() const       
>>> referenced by AttributeCommonInfo.h:166 (../tools/clang/include/clang/Basic/AttributeCommonInfo.h:166)     
>>>               tools/clang/lib/AST/CMakeFiles/obj.clangAST.dir/AttrImpl.cpp.o:(clang::AttributeCommonInfo::getAttributeSpellingListIndex() const)

[sebpop]

I still see a link error on aarch64-linux on master:

/usr/bin/ld: tools/clang/lib/AST/CMakeFiles/obj.clangAST.dir/AttrImpl.cpp.o: in function `clang::AttributeCommonInfo::getAttributeSpellingListIndex() const':
/home/ubuntu/llvm-project/llvm/tools/clang/include/clang/Basic/AttributeCommonInfo.h:166: undefined reference to `clang::AttributeCommonInfo::calculateAttributeSpellingListIndex() const'
collect2: error: ld returned 1 exit status

I reverted locally this patch and it finishes building.

[aheejin]

cfe/trunk/include/clang/Basic/AttributeCommonInfo.h

166 ↗

(On Diff #220143)

+1 This fails builds with -DBUILD_SHARED_LIBS=ON. I tried to add clangSema as a dependent library to clangAST, but this creates several circular dependencies.

[erichkeane]

cfe/trunk/include/clang/Basic/AttributeCommonInfo.h

166 ↗

(On Diff #220143)

Thanks for the heads up. The solution will just end up being moving that function's definition. I'll submit a patch on monday. Thanks for the reproducer.

[plotfi]

cfe/trunk/include/clang/Basic/AttributeCommonInfo.h

166 ↗

(On Diff #220143)

Normally I’d suggest a revert, but I can see downstream some stuff with Swift and apinotes was not completely trivial to get merged in with this patch. Is simply moving the definition the right solution here btw?

[SjoerdMeijer]

I would have definitely preferred a revert much earlier, I guess it's too late now, but not having a build is really inconvenient.

[erichkeane]

cfe/trunk/include/clang/Basic/AttributeCommonInfo.h

166 ↗

(On Diff #220143)

Yep, exactly. I would prefer someone to just fix it (since it IS something quite trivial) rather than revert. This ends up being a massive change for the purposes of improving diagnostics here and downstream.

Typically it is considered somewhat fair to give the author time to fix a failure before reverting, and unfortunately this was discovered at 8pm on a Friday, so it seems longer than this would typically take.

[erichkeane]

Fixed in r371985.

clang/include/clang/AST/Attr.h

 #define LLVM_CLANG_AST_ATTR_H
 
 #include "clang/AST/ASTContextAllocate.h"  // For Attrs.inc
 #include "clang/AST/AttrIterator.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/Expr.h"
 #include "clang/AST/Type.h"
 #include "clang/Basic/AttrKinds.h"
+#include "clang/Basic/AttributeCommonInfo.h"
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/OpenMPKinds.h"
 #include "clang/Basic/Sanitizers.h"
 #include "clang/Basic/SourceLocation.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/VersionTuple.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <cassert>
 
 namespace clang {
   class ASTContext;
+  class AttributeCommonInfo;
   class IdentifierInfo;
   class ObjCInterfaceDecl;
   class Expr;
   class QualType;
   class FunctionDecl;
   class TypeSourceInfo;
 
 /// Attr - This represents one attribute.
-class Attr {
+  class Attr : public AttributeCommonInfo {
   private:
-  SourceRange Range;
     unsigned AttrKind : 16;
 
   protected:
     /// An index into the spelling list of an
     /// attribute defined in Attr.td file.
-  unsigned SpellingListIndex : 4;
     unsigned Inherited : 1;
     unsigned IsPackExpansion : 1;
     unsigned Implicit : 1;
     // FIXME: These are properties of the attribute kind, not state for this
     // instance of the attribute.
     unsigned IsLateParsed : 1;
     unsigned InheritEvenIfAlreadyPresent : 1;
 
     void *operator new(size_t bytes) noexcept {
       llvm_unreachable("Attrs cannot be allocated with regular 'new'.");
     }
     void operator delete(void *data) noexcept {
       llvm_unreachable("Attrs cannot be released with regular 'delete'.");
     }
 
   public:
     // Forward so that the regular new and delete do not hide global ones.
     void *operator new(size_t Bytes, ASTContext &C,
                        size_t Alignment = 8) noexcept {
       return ::operator new(Bytes, C, Alignment);
     }
     void operator delete(void *Ptr, ASTContext &C, size_t Alignment) noexcept {
       return ::operator delete(Ptr, C, Alignment);
     }
 
   protected:
-  Attr(attr::Kind AK, SourceRange R, unsigned SpellingListIndex,
-       bool IsLateParsed)
-    : Range(R), AttrKind(AK), SpellingListIndex(SpellingListIndex),
-      Inherited(false), IsPackExpansion(false), Implicit(false),
-      IsLateParsed(IsLateParsed), InheritEvenIfAlreadyPresent(false) {}
+    Attr(ASTContext &Context, const AttributeCommonInfo &CommonInfo,
+         attr::Kind AK, bool IsLateParsed)
+        : AttributeCommonInfo(CommonInfo), AttrKind(AK), Inherited(false),
+          IsPackExpansion(false), Implicit(false), IsLateParsed(IsLateParsed),
+          InheritEvenIfAlreadyPresent(false) {}
 
   public:
+    attr::Kind getKind() const { return static_cast<attr::Kind>(AttrKind); }
 
-  attr::Kind getKind() const {
-    return static_cast<attr::Kind>(AttrKind);
+    unsigned getSpellingListIndex() const {
+      return getAttributeSpellingListIndex();
     }
-
-  unsigned getSpellingListIndex() const { return SpellingListIndex; }
     const char *getSpelling() const;
 
-  SourceLocation getLocation() const { return Range.getBegin(); }
-  SourceRange getRange() const { return Range; }
-  void setRange(SourceRange R) { Range = R; }
+    SourceLocation getLocation() const { return getRange().getBegin(); }
 
     bool isInherited() const { return Inherited; }
 
     /// Returns true if the attribute has been implicitly created instead
     /// of explicitly written by the user.
     bool isImplicit() const { return Implicit; }
     void setImplicit(bool I) { Implicit = I; }
 
     void setPackExpansion(bool PE) { IsPackExpansion = PE; }
     bool isPackExpansion() const { return IsPackExpansion; }
 
     // Clone this attribute.
     Attr *clone(ASTContext &C) const;
 
     bool isLateParsed() const { return IsLateParsed; }
 
     // Pretty print this attribute.
     void printPretty(raw_ostream &OS, const PrintingPolicy &Policy) const;
   };
 
 class TypeAttr : public Attr {
 protected:
-  TypeAttr(attr::Kind AK, SourceRange R, unsigned SpellingListIndex,
-           bool IsLateParsed)
-      : Attr(AK, R, SpellingListIndex, IsLateParsed) {}
+  TypeAttr(ASTContext &Context, const AttributeCommonInfo &CommonInfo,
+           attr::Kind AK, bool IsLateParsed)
+      : Attr(Context, CommonInfo, AK, IsLateParsed) {}
 
 public:
   static bool classof(const Attr *A) {
     return A->getKind() >= attr::FirstTypeAttr &&
            A->getKind() <= attr::LastTypeAttr;
   }
 };
 
 class StmtAttr : public Attr {
 protected:
-  StmtAttr(attr::Kind AK, SourceRange R, unsigned SpellingListIndex,
-                  bool IsLateParsed)
-      : Attr(AK, R, SpellingListIndex, IsLateParsed) {}
+  StmtAttr(ASTContext &Context, const AttributeCommonInfo &CommonInfo,
+           attr::Kind AK, bool IsLateParsed)
+      : Attr(Context, CommonInfo, AK, IsLateParsed) {}
 
 public:
   static bool classof(const Attr *A) {
     return A->getKind() >= attr::FirstStmtAttr &&
            A->getKind() <= attr::LastStmtAttr;
   }
 };
 
 class InheritableAttr : public Attr {
 protected:
-  InheritableAttr(attr::Kind AK, SourceRange R, unsigned SpellingListIndex,
-                  bool IsLateParsed, bool InheritEvenIfAlreadyPresent)
-      : Attr(AK, R, SpellingListIndex, IsLateParsed) {
+  InheritableAttr(ASTContext &Context, const AttributeCommonInfo &CommonInfo,
+                  attr::Kind AK, bool IsLateParsed,
+                  bool InheritEvenIfAlreadyPresent)
+      : Attr(Context, CommonInfo, AK, IsLateParsed) {
     this->InheritEvenIfAlreadyPresent = InheritEvenIfAlreadyPresent;
   }
 
 public:
   void setInherited(bool I) { Inherited = I; }
 
   /// Should this attribute be inherited from a prior declaration even if it's
   /// explicitly provided in the current declaration?
   bool shouldInheritEvenIfAlreadyPresent() const {
     return InheritEvenIfAlreadyPresent;
   }
 
   // Implement isa/cast/dyncast/etc.
   static bool classof(const Attr *A) {
     return A->getKind() >= attr::FirstInheritableAttr &&
            A->getKind() <= attr::LastInheritableAttr;
   }
 };
 
 class InheritableParamAttr : public InheritableAttr {
 protected:
-  InheritableParamAttr(attr::Kind AK, SourceRange R, unsigned SpellingListIndex,
+  InheritableParamAttr(ASTContext &Context,
+                       const AttributeCommonInfo &CommonInfo, attr::Kind AK,
                        bool IsLateParsed, bool InheritEvenIfAlreadyPresent)
-      : InheritableAttr(AK, R, SpellingListIndex, IsLateParsed,
+      : InheritableAttr(Context, CommonInfo, AK, IsLateParsed,
                         InheritEvenIfAlreadyPresent) {}
 
 public:
   // Implement isa/cast/dyncast/etc.
   static bool classof(const Attr *A) {
     return A->getKind() >= attr::FirstInheritableParamAttr &&
            A->getKind() <= attr::LastInheritableParamAttr;
   }
 };
 
 /// A parameter attribute which changes the argument-passing ABI rule
 /// for the parameter.
 class ParameterABIAttr : public InheritableParamAttr {
 protected:
-  ParameterABIAttr(attr::Kind AK, SourceRange R,
-                   unsigned SpellingListIndex, bool IsLateParsed,
+  ParameterABIAttr(ASTContext &Context, const AttributeCommonInfo &CommonInfo,
+                   attr::Kind AK, bool IsLateParsed,
                    bool InheritEvenIfAlreadyPresent)
-    : InheritableParamAttr(AK, R, SpellingListIndex, IsLateParsed,
+      : InheritableParamAttr(Context, CommonInfo, AK, IsLateParsed,
                              InheritEvenIfAlreadyPresent) {}
 
 public:
   ParameterABI getABI() const {
     switch (getKind()) {
     case attr::SwiftContext:
       return ParameterABI::SwiftContext;
     case attr::SwiftErrorResult:
       return ParameterABI::SwiftErrorResult;

clang/include/clang/Basic/Attr.td

 def ObjCRequiresPropertyDefs : InheritableAttr {
   let Spellings = [Clang<"objc_requires_property_definitions">];
   let Subjects = SubjectList<[ObjCInterface], ErrorDiag>;
   let Documentation = [Undocumented];
 }
 
 def Unused : InheritableAttr {
   let Spellings = [CXX11<"", "maybe_unused", 201603>, GCC<"unused">,
-                   C2x<"", "maybe_unused">];
+                   C2x<"", "maybe_unused">, Pragma<"", "unused">];
   let Subjects = SubjectList<[Var, ObjCIvar, Type, Enum, EnumConstant, Label,
                               Field, ObjCMethod, FunctionLike]>;
   let Documentation = [WarnMaybeUnusedDocs];
+  let AdditionalMembers = [{
+  void printPrettyPragma(raw_ostream &OS, const PrintingPolicy &Policy) const {}
+  }];
 }
 
 def Used : InheritableAttr {
   let Spellings = [GCC<"used">];
   let Subjects = SubjectList<[NonLocalVar, Function, ObjCMethod]>;
   let Documentation = [Undocumented];
 }
 
static const char *getOptionName(int Option) {
     case PipelineInitiationInterval: return "pipeline_initiation_interval";
     case Distribute: return "distribute";
     case VectorizePredicate: return "vectorize_predicate";
     }
     llvm_unreachable("Unhandled LoopHint option.");
   }
 
   void printPrettyPragma(raw_ostream &OS, const PrintingPolicy &Policy) const {
-    unsigned SpellingIndex = getSpellingListIndex();
+    unsigned SpellingIndex = getAttributeSpellingListIndex();
     // For "#pragma unroll" and "#pragma nounroll" the string "unroll" or
     // "nounroll" is already emitted as the pragma name.
     if (SpellingIndex == Pragma_nounroll || SpellingIndex == Pragma_nounroll_and_jam)
       return;
     else if (SpellingIndex == Pragma_unroll || SpellingIndex == Pragma_unroll_and_jam) {
       OS << ' ' << getValueString(Policy);
       return;
     }
std::string getValueString(const PrintingPolicy &Policy) const {
     else
       OS << "disable";
     OS << ")";
     return OS.str();
   }
 
   // Return a string suitable for identifying this attribute in diagnostics.
   std::string getDiagnosticName(const PrintingPolicy &Policy) const {
-    unsigned SpellingIndex = getSpellingListIndex();
+    unsigned SpellingIndex = getAttributeSpellingListIndex();
     if (SpellingIndex == Pragma_nounroll)
       return "#pragma nounroll";
     else if (SpellingIndex == Pragma_unroll)
       return "#pragma unroll" + (option == UnrollCount ? getValueString(Policy) : "");
     else if (SpellingIndex == Pragma_nounroll_and_jam)
       return "#pragma nounroll_and_jam";
     else if (SpellingIndex == Pragma_unroll_and_jam)
       return "#pragma unroll_and_jam" +

clang/include/clang/Basic/AttributeCommonInfo.h

+//======- AttributeCommonInfo.h - Base info about Attributes-----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the AttributeCommonInfo type, which is the base for a
+// ParsedAttr and is used by Attr as a way to share info between the two.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_BASIC_ATTRIBUTECOMMONINFO_H
+#define LLVM_CLANG_BASIC_ATTRIBUTECOMMONINFO_H
+#include "clang/Basic/SourceLocation.h"
+
+namespace clang {
+class IdentifierInfo;
+class ASTRecordWriter;
+
+class AttributeCommonInfo {
+public:
+  /// The style used to specify an attribute.
+  enum Syntax {
+    /// __attribute__((...))
+    AS_GNU,
+
+    /// [[...]]
+    AS_CXX11,
+
+    /// [[...]]
+    AS_C2x,
+
+    /// __declspec(...)
+    AS_Declspec,
+
+    /// [uuid("...")] class Foo
+    AS_Microsoft,
+
+    /// __ptr16, alignas(...), etc.
+    AS_Keyword,
+
+    /// #pragma ...
+    AS_Pragma,
+
+    // Note TableGen depends on the order above.  Do not add or change the order
+    // without adding related code to TableGen/ClangAttrEmitter.cpp.
+    /// Context-sensitive version of a keyword attribute.
+    AS_ContextSensitiveKeyword,
+  };
+  enum Kind {
+#define PARSED_ATTR(NAME) AT_##NAME,
+#include "clang/Sema/AttrParsedAttrList.inc"
+#undef PARSED_ATTR
+    IgnoredAttribute,
+    UnknownAttribute,
+  };
+
+private:
+  const IdentifierInfo *AttrName = nullptr;
+  const IdentifierInfo *ScopeName = nullptr;
+  SourceRange AttrRange;
+  const SourceLocation ScopeLoc;
+  // Corresponds to the Kind enum.
+  unsigned AttrKind : 16;
+  /// Corresponds to the Syntax enum.
+  unsigned SyntaxUsed : 3;
+  unsigned SpellingIndex : 4;
+  static constexpr unsigned SpellingNotCalculated = 0xf;
+
+public:
+  AttributeCommonInfo(SourceRange AttrRange)
+      : AttrRange(AttrRange), AttrKind(0), SyntaxUsed(0),
+        SpellingIndex(SpellingNotCalculated) {}
+
+  AttributeCommonInfo(SourceLocation AttrLoc)
+      : AttrRange(AttrLoc), AttrKind(0), SyntaxUsed(0),
+        SpellingIndex(SpellingNotCalculated) {}
+
+  AttributeCommonInfo(const IdentifierInfo *AttrName,
+                      const IdentifierInfo *ScopeName, SourceRange AttrRange,
+                      SourceLocation ScopeLoc, Syntax SyntaxUsed)
+      : AttrName(AttrName), ScopeName(ScopeName), AttrRange(AttrRange),
+        ScopeLoc(ScopeLoc),
+        AttrKind(getParsedKind(AttrName, ScopeName, SyntaxUsed)),
+        SyntaxUsed(SyntaxUsed), SpellingIndex(SpellingNotCalculated) {}
+
+  AttributeCommonInfo(const IdentifierInfo *AttrName,
+                      const IdentifierInfo *ScopeName, SourceRange AttrRange,
+                      SourceLocation ScopeLoc, Kind AttrKind, Syntax SyntaxUsed)
+      : AttrName(AttrName), ScopeName(ScopeName), AttrRange(AttrRange),
+        ScopeLoc(ScopeLoc), AttrKind(AttrKind), SyntaxUsed(SyntaxUsed),
+        SpellingIndex(SpellingNotCalculated) {}
+
+  AttributeCommonInfo(const IdentifierInfo *AttrName,
+                      const IdentifierInfo *ScopeName, SourceRange AttrRange,
+                      SourceLocation ScopeLoc, Kind AttrKind, Syntax SyntaxUsed,
+                      unsigned Spelling)
+      : AttrName(AttrName), ScopeName(ScopeName), AttrRange(AttrRange),
+        ScopeLoc(ScopeLoc), AttrKind(AttrKind), SyntaxUsed(SyntaxUsed),
+        SpellingIndex(Spelling) {}
+
+  AttributeCommonInfo(const IdentifierInfo *AttrName, SourceRange AttrRange,
+                      Syntax SyntaxUsed)
+      : AttrName(AttrName), ScopeName(nullptr), AttrRange(AttrRange),
+        ScopeLoc(), AttrKind(getParsedKind(AttrName, ScopeName, SyntaxUsed)),
+        SyntaxUsed(SyntaxUsed), SpellingIndex(SpellingNotCalculated) {}
+
+  AttributeCommonInfo(SourceRange AttrRange, Kind K, Syntax SyntaxUsed)
+      : AttrName(nullptr), ScopeName(nullptr), AttrRange(AttrRange), ScopeLoc(),
+        AttrKind(K), SyntaxUsed(SyntaxUsed),
+        SpellingIndex(SpellingNotCalculated) {}
+
+  AttributeCommonInfo(SourceRange AttrRange, Kind K, Syntax SyntaxUsed,
+                      unsigned Spelling)
+      : AttrName(nullptr), ScopeName(nullptr), AttrRange(AttrRange), ScopeLoc(),
+        AttrKind(K), SyntaxUsed(SyntaxUsed), SpellingIndex(Spelling) {}
+
+  AttributeCommonInfo(AttributeCommonInfo &&) = default;
+  AttributeCommonInfo(const AttributeCommonInfo &) = default;
+
+  Kind getParsedKind() const { return Kind(AttrKind); }
+  Syntax getSyntax() const { return Syntax(SyntaxUsed); }
+  const IdentifierInfo *getAttrName() const { return AttrName; }
+  SourceLocation getLoc() const { return AttrRange.getBegin(); }
+  SourceRange getRange() const { return AttrRange; }
+  void setRange(SourceRange R) { AttrRange = R; }
+
+  bool hasScope() const { return ScopeName; }
+  const IdentifierInfo *getScopeName() const { return ScopeName; }
+  SourceLocation getScopeLoc() const { return ScopeLoc; }
+
+  bool isDeclspecAttribute() const { return SyntaxUsed == AS_Declspec; }
+  bool isMicrosoftAttribute() const { return SyntaxUsed == AS_Microsoft; }
+
+  bool isGNUScope() const;
+
+  bool isAlignasAttribute() const {
+    // FIXME: Use a better mechanism to determine this.
+    return getParsedKind() == AT_Aligned && isKeywordAttribute();
+  }
+
+  bool isCXX11Attribute() const {
+    return SyntaxUsed == AS_CXX11 || isAlignasAttribute();
+  }
+
+  bool isC2xAttribute() const { return SyntaxUsed == AS_C2x; }
+
+  bool isKeywordAttribute() const {
+    return SyntaxUsed == AS_Keyword || SyntaxUsed == AS_ContextSensitiveKeyword;
+  }
+
+  bool isContextSensitiveKeywordAttribute() const {
+    return SyntaxUsed == AS_ContextSensitiveKeyword;
+  }
+
+  unsigned getAttributeSpellingListIndex() const {
+    assert((isAttributeSpellingListCalculated() || AttrName) &&
+           "Spelling cannot be found");
+    return isAttributeSpellingListCalculated()
+               ? SpellingIndex
+               : calculateAttributeSpellingListIndex();
+  }
+  void setAttributeSpellingListIndex(unsigned V) { SpellingIndex = V; }
+
+  static Kind getParsedKind(const IdentifierInfo *Name,
+                            const IdentifierInfo *Scope, Syntax SyntaxUsed);
+
+private:
+  /// Get an index into the attribute spelling list
+  /// defined in Attr.td. This index is used by an attribute
+  /// to pretty print itself.
+  unsigned calculateAttributeSpellingListIndex() const;
+
+  friend class clang::ASTRecordWriter;
+  // Used exclusively by ASTDeclWriter to get the raw spelling list state.
+  unsigned getAttributeSpellingListIndexRaw() const { return SpellingIndex; }
+
+protected:
+  bool isAttributeSpellingListCalculated() const {
+    return SpellingIndex != SpellingNotCalculated;
+  }
+};
+} // namespace clang
+
+#endif // LLVM_CLANG_BASIC_ATTRIBUTECOMMONINFO_H

clang/include/clang/Lex/Preprocessor.h

class Preprocessor {
 
   /// Our current position within a C++20 import-seq.
   ImportSeq ImportSeqState = ImportSeq::AfterTopLevelTokenSeq;
 
   /// Whether the module import expects an identifier next. Otherwise,
   /// it expects a '.' or ';'.
   bool ModuleImportExpectsIdentifier = false;
 
-  /// The source location of the currently-active
+  /// The source location and identifier of the currently-active
   /// \#pragma clang arc_cf_code_audited begin.
-  SourceLocation PragmaARCCFCodeAuditedLoc;
+  std::pair<IdentifierInfo *, SourceLocation> PragmaARCCFCodeAuditedInfo;
 
   /// The source location of the currently-active
   /// \#pragma clang assume_nonnull begin.
   SourceLocation PragmaAssumeNonNullLoc;
 
   /// True if we hit the code-completion point.
   bool CodeCompletionReached = false;
 
void setCodeCompletionReached() {
     // Silence any diagnostics that occur after we hit the code-completion.
     getDiagnostics().setSuppressAllDiagnostics(true);
   }
 
   /// The location of the currently-active \#pragma clang
   /// arc_cf_code_audited begin.
   ///
   /// Returns an invalid location if there is no such pragma active.
-  SourceLocation getPragmaARCCFCodeAuditedLoc() const {
-    return PragmaARCCFCodeAuditedLoc;
+  std::pair<IdentifierInfo *, SourceLocation>
+  getPragmaARCCFCodeAuditedInfo() const {
+    return PragmaARCCFCodeAuditedInfo;
   }
 
   /// Set the location of the currently-active \#pragma clang
   /// arc_cf_code_audited begin.  An invalid location ends the pragma.
-  void setPragmaARCCFCodeAuditedLoc(SourceLocation Loc) {
-    PragmaARCCFCodeAuditedLoc = Loc;
+  void setPragmaARCCFCodeAuditedInfo(IdentifierInfo *Ident,
+                                     SourceLocation Loc) {
+    PragmaARCCFCodeAuditedInfo = {Ident, Loc};
   }
 
   /// The location of the currently-active \#pragma clang
   /// assume_nonnull begin.
   ///
   /// Returns an invalid location if there is no such pragma active.
   SourceLocation getPragmaAssumeNonNullLoc() const {
     return PragmaAssumeNonNullLoc;

clang/include/clang/Sema/ParsedAttr.h

 // parsed attributes.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CLANG_SEMA_ATTRIBUTELIST_H
 #define LLVM_CLANG_SEMA_ATTRIBUTELIST_H
 
 #include "clang/Basic/AttrSubjectMatchRules.h"
+#include "clang/Basic/AttributeCommonInfo.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Sema/Ownership.h"
 #include "llvm/ADT/PointerUnion.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/TinyPtrVector.h"
 #include "llvm/Support/Allocator.h"

 /// For a GNU attribute, there are four forms of this construct:
 ///
 /// 1: __attribute__(( const )). ParmName/Args/NumArgs will all be unused.
 /// 2: __attribute__(( mode(byte) )). ParmName used, Args/NumArgs unused.
 /// 3: __attribute__(( format(printf, 1, 2) )). ParmName/Args/NumArgs all used.
 /// 4: __attribute__(( aligned(16) )). ParmName is unused, Args/Num used.
 ///
 class ParsedAttr final
-    : private llvm::TrailingObjects<
+    : public AttributeCommonInfo,
+      private llvm::TrailingObjects<
           ParsedAttr, ArgsUnion, detail::AvailabilityData,
           detail::TypeTagForDatatypeData, ParsedType, detail::PropertyData> {
   friend TrailingObjects;
 
   size_t numTrailingObjects(OverloadToken<ArgsUnion>) const { return NumArgs; }
   size_t numTrailingObjects(OverloadToken<detail::AvailabilityData>) const {
     return IsAvailability;
   }
   size_t
       numTrailingObjects(OverloadToken<detail::TypeTagForDatatypeData>) const {
     return IsTypeTagForDatatype;
   }
   size_t numTrailingObjects(OverloadToken<ParsedType>) const {
     return HasParsedType;
   }
   size_t numTrailingObjects(OverloadToken<detail::PropertyData>) const {
     return IsProperty;
   }
 
-public:
-  /// The style used to specify an attribute.
-  enum Syntax {
-    /// __attribute__((...))
-    AS_GNU,
-
-    /// [[...]]
-    AS_CXX11,
-
-    /// [[...]]
-    AS_C2x,
-
-    /// __declspec(...)
-    AS_Declspec,
-
-    /// [uuid("...")] class Foo
-    AS_Microsoft,
-
-    /// __ptr16, alignas(...), etc.
-    AS_Keyword,
-
-    /// #pragma ...
-    AS_Pragma,
-
-    // Note TableGen depends on the order above.  Do not add or change the order
-    // without adding related code to TableGen/ClangAttrEmitter.cpp.
-    /// Context-sensitive version of a keyword attribute.
-    AS_ContextSensitiveKeyword,
-  };
-
 private:
-  IdentifierInfo *AttrName;
-  IdentifierInfo *ScopeName;
   IdentifierInfo *MacroII = nullptr;
   SourceLocation MacroExpansionLoc;
-  SourceRange AttrRange;
-  SourceLocation ScopeLoc;
   SourceLocation EllipsisLoc;
 
-  unsigned AttrKind : 16;
-
   /// The number of expression arguments this attribute has.
   /// The expressions themselves are stored after the object.
   unsigned NumArgs : 16;
 
-  /// Corresponds to the Syntax enum.
-  unsigned SyntaxUsed : 3;
-
   /// True if already diagnosed as invalid.
   mutable unsigned Invalid : 1;
 
   /// True if this attribute was used as a type attribute.
   mutable unsigned UsedAsTypeAttr : 1;
 
   /// True if this has the extra information associated with an
   /// availability attribute.
private:
   friend class AttributeFactory;
   friend class AttributePool;
 
   /// Constructor for attributes with expression arguments.
   ParsedAttr(IdentifierInfo *attrName, SourceRange attrRange,
              IdentifierInfo *scopeName, SourceLocation scopeLoc,
              ArgsUnion *args, unsigned numArgs, Syntax syntaxUsed,
              SourceLocation ellipsisLoc)
-      : AttrName(attrName), ScopeName(scopeName), AttrRange(attrRange),
-        ScopeLoc(scopeLoc), EllipsisLoc(ellipsisLoc), NumArgs(numArgs),
-        SyntaxUsed(syntaxUsed), Invalid(false), UsedAsTypeAttr(false),
-        IsAvailability(false), IsTypeTagForDatatype(false), IsProperty(false),
-        HasParsedType(false), HasProcessingCache(false),
-        IsPragmaClangAttribute(false) {
-    if (numArgs) memcpy(getArgsBuffer(), args, numArgs * sizeof(ArgsUnion));
-    AttrKind = getKind(getName(), getScopeName(), syntaxUsed);
+      : AttributeCommonInfo(attrName, scopeName, attrRange, scopeLoc,
+                            syntaxUsed),
+        EllipsisLoc(ellipsisLoc), NumArgs(numArgs), Invalid(false),
+        UsedAsTypeAttr(false), IsAvailability(false),
+        IsTypeTagForDatatype(false), IsProperty(false), HasParsedType(false),
+        HasProcessingCache(false), IsPragmaClangAttribute(false) {
+    if (numArgs)
+      memcpy(getArgsBuffer(), args, numArgs * sizeof(ArgsUnion));
   }
 
   /// Constructor for availability attributes.
   ParsedAttr(IdentifierInfo *attrName, SourceRange attrRange,
              IdentifierInfo *scopeName, SourceLocation scopeLoc,
              IdentifierLoc *Parm, const AvailabilityChange &introduced,
              const AvailabilityChange &deprecated,
              const AvailabilityChange &obsoleted, SourceLocation unavailable,
              const Expr *messageExpr, Syntax syntaxUsed, SourceLocation strict,
              const Expr *replacementExpr)
-      : AttrName(attrName), ScopeName(scopeName), AttrRange(attrRange),
-        ScopeLoc(scopeLoc), NumArgs(1), SyntaxUsed(syntaxUsed), Invalid(false),
-        UsedAsTypeAttr(false), IsAvailability(true),
+      : AttributeCommonInfo(attrName, scopeName, attrRange, scopeLoc,
+                            syntaxUsed),
+        NumArgs(1), Invalid(false), UsedAsTypeAttr(false), IsAvailability(true),
         IsTypeTagForDatatype(false), IsProperty(false), HasParsedType(false),
         HasProcessingCache(false), IsPragmaClangAttribute(false),
         UnavailableLoc(unavailable), MessageExpr(messageExpr) {
     ArgsUnion PVal(Parm);
     memcpy(getArgsBuffer(), &PVal, sizeof(ArgsUnion));
     new (getAvailabilityData()) detail::AvailabilityData(
         introduced, deprecated, obsoleted, strict, replacementExpr);
-    AttrKind = getKind(getName(), getScopeName(), syntaxUsed);
   }
 
   /// Constructor for objc_bridge_related attributes.
   ParsedAttr(IdentifierInfo *attrName, SourceRange attrRange,
              IdentifierInfo *scopeName, SourceLocation scopeLoc,
              IdentifierLoc *Parm1, IdentifierLoc *Parm2, IdentifierLoc *Parm3,
              Syntax syntaxUsed)
-      : AttrName(attrName), ScopeName(scopeName), AttrRange(attrRange),
-        ScopeLoc(scopeLoc), NumArgs(3), SyntaxUsed(syntaxUsed), Invalid(false),
-        UsedAsTypeAttr(false), IsAvailability(false),
-        IsTypeTagForDatatype(false), IsProperty(false), HasParsedType(false),
-        HasProcessingCache(false), IsPragmaClangAttribute(false) {
+      : AttributeCommonInfo(attrName, scopeName, attrRange, scopeLoc,
+                            syntaxUsed),
+        NumArgs(3), Invalid(false), UsedAsTypeAttr(false),
+        IsAvailability(false), IsTypeTagForDatatype(false), IsProperty(false),
+        HasParsedType(false), HasProcessingCache(false),
+        IsPragmaClangAttribute(false) {
     ArgsUnion *Args = getArgsBuffer();
     Args[0] = Parm1;
     Args[1] = Parm2;
     Args[2] = Parm3;
-    AttrKind = getKind(getName(), getScopeName(), syntaxUsed);
   }
 
   /// Constructor for type_tag_for_datatype attribute.
   ParsedAttr(IdentifierInfo *attrName, SourceRange attrRange,
              IdentifierInfo *scopeName, SourceLocation scopeLoc,
              IdentifierLoc *ArgKind, ParsedType matchingCType,
              bool layoutCompatible, bool mustBeNull, Syntax syntaxUsed)
-      : AttrName(attrName), ScopeName(scopeName), AttrRange(attrRange),
-        ScopeLoc(scopeLoc), NumArgs(1), SyntaxUsed(syntaxUsed), Invalid(false),
-        UsedAsTypeAttr(false), IsAvailability(false),
-        IsTypeTagForDatatype(true), IsProperty(false), HasParsedType(false),
-        HasProcessingCache(false), IsPragmaClangAttribute(false) {
+      : AttributeCommonInfo(attrName, scopeName, attrRange, scopeLoc,
+                            syntaxUsed),
+        NumArgs(1), Invalid(false), UsedAsTypeAttr(false),
+        IsAvailability(false), IsTypeTagForDatatype(true), IsProperty(false),
+        HasParsedType(false), HasProcessingCache(false),
+        IsPragmaClangAttribute(false) {
     ArgsUnion PVal(ArgKind);
     memcpy(getArgsBuffer(), &PVal, sizeof(ArgsUnion));
     detail::TypeTagForDatatypeData &ExtraData = getTypeTagForDatatypeDataSlot();
     new (&ExtraData.MatchingCType) ParsedType(matchingCType);
     ExtraData.LayoutCompatible = layoutCompatible;
     ExtraData.MustBeNull = mustBeNull;
-    AttrKind = getKind(getName(), getScopeName(), syntaxUsed);
   }
 
   /// Constructor for attributes with a single type argument.
   ParsedAttr(IdentifierInfo *attrName, SourceRange attrRange,
              IdentifierInfo *scopeName, SourceLocation scopeLoc,
              ParsedType typeArg, Syntax syntaxUsed)
-      : AttrName(attrName), ScopeName(scopeName), AttrRange(attrRange),
-        ScopeLoc(scopeLoc), NumArgs(0), SyntaxUsed(syntaxUsed), Invalid(false),
-        UsedAsTypeAttr(false), IsAvailability(false),
-        IsTypeTagForDatatype(false), IsProperty(false), HasParsedType(true),
-        HasProcessingCache(false), IsPragmaClangAttribute(false) {
+      : AttributeCommonInfo(attrName, scopeName, attrRange, scopeLoc,
+                            syntaxUsed),
+        NumArgs(0), Invalid(false), UsedAsTypeAttr(false),
+        IsAvailability(false), IsTypeTagForDatatype(false), IsProperty(false),
+        HasParsedType(true), HasProcessingCache(false),
+        IsPragmaClangAttribute(false) {
     new (&getTypeBuffer()) ParsedType(typeArg);
-    AttrKind = getKind(getName(), getScopeName(), syntaxUsed);
   }
 
   /// Constructor for microsoft __declspec(property) attribute.
   ParsedAttr(IdentifierInfo *attrName, SourceRange attrRange,
              IdentifierInfo *scopeName, SourceLocation scopeLoc,
              IdentifierInfo *getterId, IdentifierInfo *setterId,
              Syntax syntaxUsed)
-      : AttrName(attrName), ScopeName(scopeName), AttrRange(attrRange),
-        ScopeLoc(scopeLoc), NumArgs(0), SyntaxUsed(syntaxUsed), Invalid(false),
-        UsedAsTypeAttr(false), IsAvailability(false),
-        IsTypeTagForDatatype(false), IsProperty(true), HasParsedType(false),
-        HasProcessingCache(false), IsPragmaClangAttribute(false) {
+      : AttributeCommonInfo(attrName, scopeName, attrRange, scopeLoc,
+                            syntaxUsed),
+        NumArgs(0), Invalid(false), UsedAsTypeAttr(false),
+        IsAvailability(false), IsTypeTagForDatatype(false), IsProperty(true),
+        HasParsedType(false), HasProcessingCache(false),
+        IsPragmaClangAttribute(false) {
     new (&getPropertyDataBuffer()) detail::PropertyData(getterId, setterId);
-    AttrKind = getKind(getName(), getScopeName(), syntaxUsed);
   }
 
   /// Type tag information is stored immediately following the arguments, if
   /// any, at the end of the object.  They are mutually exclusive with
   /// availability slots.
   detail::TypeTagForDatatypeData &getTypeTagForDatatypeDataSlot() {
     return *getTrailingObjects<detail::TypeTagForDatatypeData>();
   }
public:
   ParsedAttr(const ParsedAttr &) = delete;
   ParsedAttr(ParsedAttr &&) = delete;
   ParsedAttr &operator=(const ParsedAttr &) = delete;
   ParsedAttr &operator=(ParsedAttr &&) = delete;
   ~ParsedAttr() = delete;
 
   void operator delete(void *) = delete;
 
-  enum Kind {
-    #define PARSED_ATTR(NAME) AT_##NAME,
-    #include "clang/Sema/AttrParsedAttrList.inc"
-    #undef PARSED_ATTR
-    IgnoredAttribute,
-    UnknownAttribute
-  };
-
-  IdentifierInfo *getName() const { return AttrName; }
-  SourceLocation getLoc() const { return AttrRange.getBegin(); }
-  SourceRange getRange() const { return AttrRange; }
-
-  bool hasScope() const { return ScopeName; }
-  IdentifierInfo *getScopeName() const { return ScopeName; }
-  SourceLocation getScopeLoc() const { return ScopeLoc; }
-
-  bool isGNUScope() const {
-    return ScopeName &&
-           (ScopeName->isStr("gnu") || ScopeName->isStr("__gnu__"));
-  }
-
   bool hasParsedType() const { return HasParsedType; }
 
   /// Is this the Microsoft __declspec(property) attribute?
   bool isDeclspecPropertyAttribute() const  {
     return IsProperty;
   }
 
-  bool isAlignasAttribute() const {
-    // FIXME: Use a better mechanism to determine this.
-    return getKind() == AT_Aligned && isKeywordAttribute();
-  }
-
-  bool isDeclspecAttribute() const { return SyntaxUsed == AS_Declspec; }
-  bool isMicrosoftAttribute() const { return SyntaxUsed == AS_Microsoft; }
-
-  bool isCXX11Attribute() const {
-    return SyntaxUsed == AS_CXX11 || isAlignasAttribute();
-  }
-
-  bool isC2xAttribute() const {
-    return SyntaxUsed == AS_C2x;
-  }
-
-  bool isKeywordAttribute() const {
-    return SyntaxUsed == AS_Keyword || SyntaxUsed == AS_ContextSensitiveKeyword;
-  }
-
-  bool isContextSensitiveKeywordAttribute() const {
-    return SyntaxUsed == AS_ContextSensitiveKeyword;
-  }
-
   bool isInvalid() const { return Invalid; }
   void setInvalid(bool b = true) const { Invalid = b; }
 
   bool hasProcessingCache() const { return HasProcessingCache; }
 
   unsigned getProcessingCache() const {
     assert(hasProcessingCache());
     return ProcessingCache;
public:
   /// True if the attribute is specified using '#pragma clang attribute'.
   bool isPragmaClangAttribute() const { return IsPragmaClangAttribute; }
 
   void setIsPragmaClangAttribute() { IsPragmaClangAttribute = true; }
 
   bool isPackExpansion() const { return EllipsisLoc.isValid(); }
   SourceLocation getEllipsisLoc() const { return EllipsisLoc; }
 
-  Kind getKind() const { return Kind(AttrKind); }
-  static Kind getKind(const IdentifierInfo *Name, const IdentifierInfo *Scope,
-                      Syntax SyntaxUsed);
-
   /// getNumArgs - Return the number of actual arguments to this attribute.
   unsigned getNumArgs() const { return NumArgs; }
 
   /// getArg - Return the specified argument.
   ArgsUnion getArg(unsigned Arg) const {
     assert(Arg < NumArgs && "Arg access out of range!");
     return getArgsBuffer()[Arg];
   }
bool isArgIdent(unsigned Arg) const {
     return Arg < NumArgs && getArg(Arg).is<IdentifierLoc*>();
   }
 
   IdentifierLoc *getArgAsIdent(unsigned Arg) const {
     return getArg(Arg).get<IdentifierLoc*>();
   }
 
   const AvailabilityChange &getAvailabilityIntroduced() const {
-    assert(getKind() == AT_Availability && "Not an availability attribute");
+    assert(getParsedKind() == AT_Availability &&
+           "Not an availability attribute");
     return getAvailabilityData()->Changes[detail::IntroducedSlot];
   }
 
   const AvailabilityChange &getAvailabilityDeprecated() const {
-    assert(getKind() == AT_Availability && "Not an availability attribute");
+    assert(getParsedKind() == AT_Availability &&
+           "Not an availability attribute");
     return getAvailabilityData()->Changes[detail::DeprecatedSlot];
   }
 
   const AvailabilityChange &getAvailabilityObsoleted() const {
-    assert(getKind() == AT_Availability && "Not an availability attribute");
+    assert(getParsedKind() == AT_Availability &&
+           "Not an availability attribute");
     return getAvailabilityData()->Changes[detail::ObsoletedSlot];
   }
 
   SourceLocation getStrictLoc() const {
-    assert(getKind() == AT_Availability && "Not an availability attribute");
+    assert(getParsedKind() == AT_Availability &&
+           "Not an availability attribute");
     return getAvailabilityData()->StrictLoc;
   }
 
   SourceLocation getUnavailableLoc() const {
-    assert(getKind() == AT_Availability && "Not an availability attribute");
+    assert(getParsedKind() == AT_Availability &&
+           "Not an availability attribute");
     return UnavailableLoc;
   }
 
   const Expr * getMessageExpr() const {
-    assert(getKind() == AT_Availability && "Not an availability attribute");
+    assert(getParsedKind() == AT_Availability &&
+           "Not an availability attribute");
     return MessageExpr;
   }
 
   const Expr *getReplacementExpr() const {
-    assert(getKind() == AT_Availability && "Not an availability attribute");
+    assert(getParsedKind() == AT_Availability &&
+           "Not an availability attribute");
     return getAvailabilityData()->Replacement;
   }
 
   const ParsedType &getMatchingCType() const {
-    assert(getKind() == AT_TypeTagForDatatype &&
+    assert(getParsedKind() == AT_TypeTagForDatatype &&
            "Not a type_tag_for_datatype attribute");
     return getTypeTagForDatatypeDataSlot().MatchingCType;
   }
 
   bool getLayoutCompatible() const {
-    assert(getKind() == AT_TypeTagForDatatype &&
+    assert(getParsedKind() == AT_TypeTagForDatatype &&
            "Not a type_tag_for_datatype attribute");
     return getTypeTagForDatatypeDataSlot().LayoutCompatible;
   }
 
   bool getMustBeNull() const {
-    assert(getKind() == AT_TypeTagForDatatype &&
+    assert(getParsedKind() == AT_TypeTagForDatatype &&
            "Not a type_tag_for_datatype attribute");
     return getTypeTagForDatatypeDataSlot().MustBeNull;
   }
 
   const ParsedType &getTypeArg() const {
     assert(HasParsedType && "Not a type attribute");
     return getTypeBuffer();
   }
public:
   IdentifierInfo *getMacroIdentifier() const { return MacroII; }
 
   SourceLocation getMacroExpansionLoc() const {
     assert(hasMacroIdentifier() && "Can only get the macro expansion location "
                                    "if this attribute has a macro identifier.");
     return MacroExpansionLoc;
   }
 
-  /// Get an index into the attribute spelling list
-  /// defined in Attr.td. This index is used by an attribute
-  /// to pretty print itself.
-  unsigned getAttributeSpellingListIndex() const;
-
   bool isTargetSpecificAttr() const;
   bool isTypeAttr() const;
   bool isStmtAttr() const;
 
   bool hasCustomParsing() const;
   unsigned getMinArgs() const;
   unsigned getMaxArgs() const;
   bool hasVariadicArg() const;
public:
   /// spelling variations), return the value of that semantic spelling. If the
   /// parsed attribute does not have a semantic equivalent, or would not have
   /// a Spelling enumeration, the value UINT_MAX is returned.
   unsigned getSemanticSpelling() const;
 
   /// If this is an OpenCL addr space attribute returns its representation
   /// in LangAS, otherwise returns default addr space.
   LangAS asOpenCLLangAS() const {
-    switch (getKind()) {
+    switch (getParsedKind()) {
     case ParsedAttr::AT_OpenCLConstantAddressSpace:
       return LangAS::opencl_constant;
     case ParsedAttr::AT_OpenCLGlobalAddressSpace:
       return LangAS::opencl_global;
     case ParsedAttr::AT_OpenCLLocalAddressSpace:
       return LangAS::opencl_local;
     case ParsedAttr::AT_OpenCLPrivateAddressSpace:
       return LangAS::opencl_private;
     case ParsedAttr::AT_OpenCLGenericAddressSpace:
       return LangAS::opencl_generic;
     default:
       return LangAS::Default;
     }
   }
+
+  AttributeCommonInfo::Kind getKind() const { return getParsedKind(); }
 };
 
 class AttributePool;
 /// A factory, from which one makes pools, from which one creates
 /// individual attributes which are deallocated with the pool.
 ///
 /// Note that it's tolerably cheap to create and destroy one of
 /// these as long as you don't actually allocate anything in it.
ParsedAttr &back() {
     return *AttrList.back();
   }
   const ParsedAttr &back() const {
     assert(!empty());
     return *AttrList.back();
   }
 
   bool hasAttribute(ParsedAttr::Kind K) const {
-    return llvm::any_of(
-        AttrList, [K](const ParsedAttr *AL) { return AL->getKind() == K; });
+    return llvm::any_of(AttrList, [K](const ParsedAttr *AL) {
+      return AL->getParsedKind() == K;
+    });
   }
 
 private:
   VecTy AttrList;
 };
 
 /// ParsedAttributes - A collection of parsed attributes.  Currently
 /// we don't differentiate between the various attribute syntaxes,
enum AttributeDeclKind {
   ExpectedTypeOrNamespace,
   ExpectedFunctionVariableOrClass,
   ExpectedKernelFunction,
   ExpectedFunctionWithProtoType,
 };
 
 inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
                                            const ParsedAttr &At) {
-  DB.AddTaggedVal(reinterpret_cast<intptr_t>(At.getName()),
+  DB.AddTaggedVal(reinterpret_cast<intptr_t>(At.getAttrName()),
                   DiagnosticsEngine::ak_identifierinfo);
   return DB;
 }
 
 inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                            const ParsedAttr &At) {
-  PD.AddTaggedVal(reinterpret_cast<intptr_t>(At.getName()),
+  PD.AddTaggedVal(reinterpret_cast<intptr_t>(At.getAttrName()),
                   DiagnosticsEngine::ak_identifierinfo);
   return PD;
 }
 
 inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
                                            const ParsedAttr *At) {
-  DB.AddTaggedVal(reinterpret_cast<intptr_t>(At->getName()),
+  DB.AddTaggedVal(reinterpret_cast<intptr_t>(At->getAttrName()),
                   DiagnosticsEngine::ak_identifierinfo);
   return DB;
 }
 
 inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
                                            const ParsedAttr *At) {
-  PD.AddTaggedVal(reinterpret_cast<intptr_t>(At->getName()),
+  PD.AddTaggedVal(reinterpret_cast<intptr_t>(At->getAttrName()),
                   DiagnosticsEngine::ak_identifierinfo);
   return PD;
 }
 
 } // namespace clang
 
 #endif // LLVM_CLANG_SEMA_ATTRIBUTELIST_H

clang/include/clang/Sema/Sema.h

enum AvailabilityPriority : int {
     AP_PragmaClangAttribute = 1,
 
     /// The availability attribute for a specific platform was inferred from
     /// an availability attribute for another platform.
     AP_InferredFromOtherPlatform = 2
   };
 
   /// Attribute merging methods. Return true if a new attribute was added.
-  AvailabilityAttr *mergeAvailabilityAttr(
-      NamedDecl *D, SourceRange Range, IdentifierInfo *Platform, bool Implicit,
-      VersionTuple Introduced, VersionTuple Deprecated, VersionTuple Obsoleted,
-      bool IsUnavailable, StringRef Message, bool IsStrict,
-      StringRef Replacement, AvailabilityMergeKind AMK, int Priority,
-      unsigned AttrSpellingListIndex);
-  TypeVisibilityAttr *mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
-                                       TypeVisibilityAttr::VisibilityType Vis,
-                                              unsigned AttrSpellingListIndex);
-  VisibilityAttr *mergeVisibilityAttr(Decl *D, SourceRange Range,
-                                      VisibilityAttr::VisibilityType Vis,
-                                      unsigned AttrSpellingListIndex);
-  UuidAttr *mergeUuidAttr(Decl *D, SourceRange Range,
-                          unsigned AttrSpellingListIndex, StringRef Uuid);
-  DLLImportAttr *mergeDLLImportAttr(Decl *D, SourceRange Range,
-                                    unsigned AttrSpellingListIndex);
-  DLLExportAttr *mergeDLLExportAttr(Decl *D, SourceRange Range,
-                                    unsigned AttrSpellingListIndex);
+  AvailabilityAttr *
+  mergeAvailabilityAttr(NamedDecl *D, const AttributeCommonInfo &CI,
+                        IdentifierInfo *Platform, bool Implicit,
+                        VersionTuple Introduced, VersionTuple Deprecated,
+                        VersionTuple Obsoleted, bool IsUnavailable,
+                        StringRef Message, bool IsStrict, StringRef Replacement,
+                        AvailabilityMergeKind AMK, int Priority);
+  TypeVisibilityAttr *
+  mergeTypeVisibilityAttr(Decl *D, const AttributeCommonInfo &CI,
+                          TypeVisibilityAttr::VisibilityType Vis);
+  VisibilityAttr *mergeVisibilityAttr(Decl *D, const AttributeCommonInfo &CI,
+                                      VisibilityAttr::VisibilityType Vis);
+  UuidAttr *mergeUuidAttr(Decl *D, const AttributeCommonInfo &CI,
+                          StringRef Uuid);
+  DLLImportAttr *mergeDLLImportAttr(Decl *D, const AttributeCommonInfo &CI);
+  DLLExportAttr *mergeDLLExportAttr(Decl *D, const AttributeCommonInfo &CI);
   MSInheritanceAttr *
-  mergeMSInheritanceAttr(Decl *D, SourceRange Range, bool BestCase,
-                         unsigned AttrSpellingListIndex,
+  mergeMSInheritanceAttr(Decl *D, const AttributeCommonInfo &CI, bool BestCase,
                          MSInheritanceAttr::Spelling SemanticSpelling);
-  FormatAttr *mergeFormatAttr(Decl *D, SourceRange Range,
+  FormatAttr *mergeFormatAttr(Decl *D, const AttributeCommonInfo &CI,
                               IdentifierInfo *Format, int FormatIdx,
-                              int FirstArg, unsigned AttrSpellingListIndex);
-  SectionAttr *mergeSectionAttr(Decl *D, SourceRange Range, StringRef Name,
-                                unsigned AttrSpellingListIndex);
-  CodeSegAttr *mergeCodeSegAttr(Decl *D, SourceRange Range, StringRef Name,
-                                unsigned AttrSpellingListIndex);
-  AlwaysInlineAttr *mergeAlwaysInlineAttr(Decl *D, SourceRange Range,
-                                          IdentifierInfo *Ident,
-                                          unsigned AttrSpellingListIndex);
-  MinSizeAttr *mergeMinSizeAttr(Decl *D, SourceRange Range,
-                                unsigned AttrSpellingListIndex);
+                              int FirstArg);
+  SectionAttr *mergeSectionAttr(Decl *D, const AttributeCommonInfo &CI,
+                                StringRef Name);
+  CodeSegAttr *mergeCodeSegAttr(Decl *D, const AttributeCommonInfo &CI,
+                                StringRef Name);
+  AlwaysInlineAttr *mergeAlwaysInlineAttr(Decl *D,
+                                          const AttributeCommonInfo &CI,
+                                          const IdentifierInfo *Ident);
+  MinSizeAttr *mergeMinSizeAttr(Decl *D, const AttributeCommonInfo &CI);
   NoSpeculativeLoadHardeningAttr *
   mergeNoSpeculativeLoadHardeningAttr(Decl *D,
                                       const NoSpeculativeLoadHardeningAttr &AL);
   SpeculativeLoadHardeningAttr *
   mergeSpeculativeLoadHardeningAttr(Decl *D,
                                     const SpeculativeLoadHardeningAttr &AL);
-  OptimizeNoneAttr *mergeOptimizeNoneAttr(Decl *D, SourceRange Range,
-                                          unsigned AttrSpellingListIndex);
+  OptimizeNoneAttr *mergeOptimizeNoneAttr(Decl *D,
+                                          const AttributeCommonInfo &CI);
   InternalLinkageAttr *mergeInternalLinkageAttr(Decl *D, const ParsedAttr &AL);
   InternalLinkageAttr *mergeInternalLinkageAttr(Decl *D,
                                                 const InternalLinkageAttr &AL);
   CommonAttr *mergeCommonAttr(Decl *D, const ParsedAttr &AL);
   CommonAttr *mergeCommonAttr(Decl *D, const CommonAttr &AL);
 
   void mergeDeclAttributes(NamedDecl *New, Decl *Old,
                            AvailabilityMergeKind AMK = AMK_Redeclaration);

   void AddRangeBasedOptnone(FunctionDecl *FD);
 
   /// Adds the 'optnone' attribute to the function declaration if there
   /// are no conflicts; Loc represents the location causing the 'optnone'
   /// attribute to be added (usually because of a pragma).
   void AddOptnoneAttributeIfNoConflicts(FunctionDecl *FD, SourceLocation Loc);
 
   /// AddAlignedAttr - Adds an aligned attribute to a particular declaration.
-  void AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
-                      unsigned SpellingListIndex, bool IsPackExpansion);
-  void AddAlignedAttr(SourceRange AttrRange, Decl *D, TypeSourceInfo *T,
-                      unsigned SpellingListIndex, bool IsPackExpansion);
+  void AddAlignedAttr(Decl *D, const AttributeCommonInfo &CI, Expr *E,
+                      bool IsPackExpansion);
+  void AddAlignedAttr(Decl *D, const AttributeCommonInfo &CI, TypeSourceInfo *T,
+                      bool IsPackExpansion);
 
   /// AddAssumeAlignedAttr - Adds an assume_aligned attribute to a particular
   /// declaration.
-  void AddAssumeAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E, Expr *OE,
-                            unsigned SpellingListIndex);
+  void AddAssumeAlignedAttr(Decl *D, const AttributeCommonInfo &CI, Expr *E,
+                            Expr *OE);
 
   /// AddAllocAlignAttr - Adds an alloc_align attribute to a particular
   /// declaration.
-  void AddAllocAlignAttr(SourceRange AttrRange, Decl *D, Expr *ParamExpr,
-                         unsigned SpellingListIndex);
+  void AddAllocAlignAttr(Decl *D, const AttributeCommonInfo &CI,
+                         Expr *ParamExpr);
 
   /// AddAlignValueAttr - Adds an align_value attribute to a particular
   /// declaration.
-  void AddAlignValueAttr(SourceRange AttrRange, Decl *D, Expr *E,
-                         unsigned SpellingListIndex);
+  void AddAlignValueAttr(Decl *D, const AttributeCommonInfo &CI, Expr *E);
 
   /// AddLaunchBoundsAttr - Adds a launch_bounds attribute to a particular
   /// declaration.
-  void AddLaunchBoundsAttr(SourceRange AttrRange, Decl *D, Expr *MaxThreads,
-                           Expr *MinBlocks, unsigned SpellingListIndex);
+  void AddLaunchBoundsAttr(Decl *D, const AttributeCommonInfo &CI,
+                           Expr *MaxThreads, Expr *MinBlocks);
 
   /// AddModeAttr - Adds a mode attribute to a particular declaration.
-  void AddModeAttr(SourceRange AttrRange, Decl *D, IdentifierInfo *Name,
-                   unsigned SpellingListIndex, bool InInstantiation = false);
+  void AddModeAttr(Decl *D, const AttributeCommonInfo &CI, IdentifierInfo *Name,
+                   bool InInstantiation = false);
 
-  void AddParameterABIAttr(SourceRange AttrRange, Decl *D,
-                           ParameterABI ABI, unsigned SpellingListIndex);
+  void AddParameterABIAttr(Decl *D, const AttributeCommonInfo &CI,
+                           ParameterABI ABI);
 
   enum class RetainOwnershipKind {NS, CF, OS};
-  void AddXConsumedAttr(Decl *D, SourceRange SR, unsigned SpellingIndex,
+  void AddXConsumedAttr(Decl *D, const AttributeCommonInfo &CI,
                         RetainOwnershipKind K, bool IsTemplateInstantiation);
 
   /// addAMDGPUFlatWorkGroupSizeAttr - Adds an amdgpu_flat_work_group_size
   /// attribute to a particular declaration.
-  void addAMDGPUFlatWorkGroupSizeAttr(SourceRange AttrRange, Decl *D, Expr *Min,
-                                      Expr *Max, unsigned SpellingListIndex);
+  void addAMDGPUFlatWorkGroupSizeAttr(Decl *D, const AttributeCommonInfo &CI,
+                                      Expr *Min, Expr *Max);
 
   /// addAMDGPUWavePersEUAttr - Adds an amdgpu_waves_per_eu attribute to a
   /// particular declaration.
-  void addAMDGPUWavesPerEUAttr(SourceRange AttrRange, Decl *D, Expr *Min,
-                               Expr *Max, unsigned SpellingListIndex);
+  void addAMDGPUWavesPerEUAttr(Decl *D, const AttributeCommonInfo &CI,
+                               Expr *Min, Expr *Max);
 
   bool checkNSReturnsRetainedReturnType(SourceLocation loc, QualType type);
 
   //===--------------------------------------------------------------------===//
   // C++ Coroutines TS
   //
   bool ActOnCoroutineBodyStart(Scope *S, SourceLocation KwLoc,
                                StringRef Keyword);

clang/lib/CodeGen/CGOpenMPRuntimeNVPTX.cpp

if (SingleEscaped.count(VD)) {
           C.getTrivialTypeSourceInfo(Type, SourceLocation()),
           /*BW=*/nullptr, /*Mutable=*/false,
           /*InitStyle=*/ICIS_NoInit);
       Field->setAccess(AS_public);
       llvm::APInt Align(32, std::max(C.getDeclAlign(VD).getQuantity(),
                                      static_cast<CharUnits::QuantityType>(
                                          GlobalMemoryAlignment)));
       Field->addAttr(AlignedAttr::CreateImplicit(
-          C, AlignedAttr::GNU_aligned, /*IsAlignmentExpr=*/true,
+          C, /*IsAlignmentExpr=*/true,
           IntegerLiteral::Create(C, Align,
                                  C.getIntTypeForBitwidth(32, /*Signed=*/0),
-                                 SourceLocation())));
+                                 SourceLocation()),
+          AttributeCommonInfo({}, AttributeCommonInfo::AT_Aligned,
+                              AttributeCommonInfo::AS_GNU,
+                              AlignedAttr::GNU_aligned)));
     }
     GlobalizedRD->addDecl(Field);
     MappedDeclsFields.try_emplace(VD, Field);
   }
   GlobalizedRD->completeDefinition();
   return GlobalizedRD;
 }
 

clang/lib/Lex/PPDirectives.cpp

Preprocessor::ImportAction Preprocessor::HandleHeaderIncludeOrImport(
   // error.
   if (Filename.empty())
     return {ImportAction::None};
 
   bool IsImportDecl = HashLoc.isInvalid();
   SourceLocation StartLoc = IsImportDecl ? IncludeTok.getLocation() : HashLoc;
 
   // Complain about attempts to #include files in an audit pragma.
-  if (PragmaARCCFCodeAuditedLoc.isValid()) {
+  if (PragmaARCCFCodeAuditedInfo.second.isValid()) {
     Diag(StartLoc, diag::err_pp_include_in_arc_cf_code_audited) << IsImportDecl;
-    Diag(PragmaARCCFCodeAuditedLoc, diag::note_pragma_entered_here);
+    Diag(PragmaARCCFCodeAuditedInfo.second, diag::note_pragma_entered_here);
 
     // Immediately leave the pragma.
-    PragmaARCCFCodeAuditedLoc = SourceLocation();
+    PragmaARCCFCodeAuditedInfo = {nullptr, SourceLocation()};
   }
 
   // Complain about attempts to #include files in an assume-nonnull pragma.
   if (PragmaAssumeNonNullLoc.isValid()) {
     Diag(StartLoc, diag::err_pp_include_in_assume_nonnull) << IsImportDecl;
     Diag(PragmaAssumeNonNullLoc, diag::note_pragma_entered_here);
 
     // Immediately leave the pragma.

clang/lib/Lex/PPLexerChange.cpp

if (const IdentifierInfo *ControllingMacro =
         }
       }
     }
   }
 
   // Complain about reaching a true EOF within arc_cf_code_audited.
   // We don't want to complain about reaching the end of a macro
   // instantiation or a _Pragma.
-  if (PragmaARCCFCodeAuditedLoc.isValid() &&
-      !isEndOfMacro && !(CurLexer && CurLexer->Is_PragmaLexer)) {
-    Diag(PragmaARCCFCodeAuditedLoc, diag::err_pp_eof_in_arc_cf_code_audited);
+  if (PragmaARCCFCodeAuditedInfo.second.isValid() && !isEndOfMacro &&
+      !(CurLexer && CurLexer->Is_PragmaLexer)) {
+    Diag(PragmaARCCFCodeAuditedInfo.second,
+         diag::err_pp_eof_in_arc_cf_code_audited);
 
     // Recover by leaving immediately.
-    PragmaARCCFCodeAuditedLoc = SourceLocation();
+    PragmaARCCFCodeAuditedInfo = {nullptr, SourceLocation()};
   }
 
   // Complain about reaching a true EOF within assume_nonnull.
   // We don't want to complain about reaching the end of a macro
   // instantiation or a _Pragma.
   if (PragmaAssumeNonNullLoc.isValid() &&
       !isEndOfMacro && !(CurLexer && CurLexer->Is_PragmaLexer)) {
     Diag(PragmaAssumeNonNullLoc, diag::err_pp_eof_in_assume_nonnull);

clang/lib/Lex/Pragma.cpp

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
     }
 
     // Verify that this is followed by EOD.
     PP.LexUnexpandedToken(Tok);
     if (Tok.isNot(tok::eod))
       PP.Diag(Tok, diag::ext_pp_extra_tokens_at_eol) << "pragma";
 
     // The start location of the active audit.
-    SourceLocation BeginLoc = PP.getPragmaARCCFCodeAuditedLoc();
+    SourceLocation BeginLoc = PP.getPragmaARCCFCodeAuditedInfo().second;
 
     // The start location we want after processing this.
     SourceLocation NewLoc;
 
     if (IsBegin) {
       // Complain about attempts to re-enter an audit.
       if (BeginLoc.isValid()) {
         PP.Diag(Loc, diag::err_pp_double_begin_of_arc_cf_code_audited);
         PP.Diag(BeginLoc, diag::note_pragma_entered_here);
       }
       NewLoc = Loc;
     } else {
       // Complain about attempts to leave an audit that doesn't exist.
       if (!BeginLoc.isValid()) {
         PP.Diag(Loc, diag::err_pp_unmatched_end_of_arc_cf_code_audited);
         return;
       }
       NewLoc = SourceLocation();
     }
 
-    PP.setPragmaARCCFCodeAuditedLoc(NewLoc);
+    PP.setPragmaARCCFCodeAuditedInfo(NameTok.getIdentifierInfo(), NewLoc);
   }
 };
 
 /// PragmaAssumeNonNullHandler -
 ///   \#pragma clang assume_nonnull begin/end
 struct PragmaAssumeNonNullHandler : public PragmaHandler {
   PragmaAssumeNonNullHandler() : PragmaHandler("assume_nonnull") {}
 

clang/lib/Parse/ParseDecl.cpp

if (ChangeKWThisToIdent && Tok.is(tok::kw_this))
     Tok.setKind(tok::identifier);
 
   ArgsVector ArgExprs;
   if (Tok.is(tok::identifier)) {
     // If this attribute wants an 'identifier' argument, make it so.
     bool IsIdentifierArg = attributeHasIdentifierArg(*AttrName) ||
                            attributeHasVariadicIdentifierArg(*AttrName);
     ParsedAttr::Kind AttrKind =
-        ParsedAttr::getKind(AttrName, ScopeName, Syntax);
+        ParsedAttr::getParsedKind(AttrName, ScopeName, Syntax);
 
     // If we don't know how to parse this attribute, but this is the only
     // token in this argument, assume it's meant to be an identifier.
     if (AttrKind == ParsedAttr::UnknownAttribute ||
         AttrKind == ParsedAttr::IgnoredAttribute) {
       const Token &Next = NextToken();
       IsIdentifierArg = Next.isOneOf(tok::r_paren, tok::comma);
     }
void Parser::ParseGNUAttributeArgs(IdentifierInfo *AttrName,
                                    IdentifierInfo *ScopeName,
                                    SourceLocation ScopeLoc,
                                    ParsedAttr::Syntax Syntax,
                                    Declarator *D) {
 
   assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
 
   ParsedAttr::Kind AttrKind =
-      ParsedAttr::getKind(AttrName, ScopeName, Syntax);
+      ParsedAttr::getParsedKind(AttrName, ScopeName, Syntax);
 
   if (AttrKind == ParsedAttr::AT_Availability) {
     ParseAvailabilityAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
                                ScopeLoc, Syntax);
     return;
   } else if (AttrKind == ParsedAttr::AT_ExternalSourceSymbol) {
     ParseExternalSourceSymbolAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
                                        ScopeName, ScopeLoc, Syntax);

 
 unsigned Parser::ParseClangAttributeArgs(
     IdentifierInfo *AttrName, SourceLocation AttrNameLoc,
     ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
     SourceLocation ScopeLoc, ParsedAttr::Syntax Syntax) {
   assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
 
   ParsedAttr::Kind AttrKind =
-      ParsedAttr::getKind(AttrName, ScopeName, Syntax);
+      ParsedAttr::getParsedKind(AttrName, ScopeName, Syntax);
 
   switch (AttrKind) {
   default:
     return ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc,
                                     ScopeName, ScopeLoc, Syntax);
   case ParsedAttr::AT_ExternalSourceSymbol:
     ParseExternalSourceSymbolAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
                                        ScopeName, ScopeLoc, Syntax);

 }
 
 void Parser::ProhibitCXX11Attributes(ParsedAttributesWithRange &Attrs,
                                      unsigned DiagID) {
   for (const ParsedAttr &AL : Attrs) {
     if (!AL.isCXX11Attribute() && !AL.isC2xAttribute())
       continue;
     if (AL.getKind() == ParsedAttr::UnknownAttribute)
-      Diag(AL.getLoc(), diag::warn_unknown_attribute_ignored) << AL.getName();
+      Diag(AL.getLoc(), diag::warn_unknown_attribute_ignored) << AL;
     else {
-      Diag(AL.getLoc(), DiagID) << AL.getName();
+      Diag(AL.getLoc(), DiagID) << AL;
       AL.setInvalid();
     }
   }
 }
 
 // Usually, `__attribute__((attrib)) class Foo {} var` means that attribute
 // applies to var, not the type Foo.
 // As an exception to the rule, __declspec(align(...)) before the

clang/lib/Parse/ParseDeclCXX.cpp

if (isLetter(Spelling[0])) {
       return &PP.getIdentifierTable().get(Spelling);
     }
     return nullptr;
   }
 }
 
 static bool IsBuiltInOrStandardCXX11Attribute(IdentifierInfo *AttrName,
                                               IdentifierInfo *ScopeName) {
-  switch (ParsedAttr::getKind(AttrName, ScopeName, ParsedAttr::AS_CXX11)) {
+  switch (
+      ParsedAttr::getParsedKind(AttrName, ScopeName, ParsedAttr::AS_CXX11)) {
   case ParsedAttr::AT_CarriesDependency:
   case ParsedAttr::AT_Deprecated:
   case ParsedAttr::AT_FallThrough:
   case ParsedAttr::AT_CXX11NoReturn:
   case ParsedAttr::AT_NoUniqueAddress:
     return true;
   case ParsedAttr::AT_WarnUnusedResult:
     return !ScopeName && AttrName->getName().equals("nodiscard");

clang/lib/Parse/ParseExprCXX.cpp

ExprResult Parser::ParseLambdaExpressionAfterIntroducer(
   // after '(...)'. nvcc doesn't accept this.
   auto WarnIfHasCUDATargetAttr = [&] {
     if (getLangOpts().CUDA)
       for (const ParsedAttr &A : Attr)
         if (A.getKind() == ParsedAttr::AT_CUDADevice ||
             A.getKind() == ParsedAttr::AT_CUDAHost ||
             A.getKind() == ParsedAttr::AT_CUDAGlobal)
           Diag(A.getLoc(), diag::warn_cuda_attr_lambda_position)
-              << A.getName()->getName();
+              << A.getAttrName()->getName();
   };
 
   // FIXME: Consider allowing this as an extension for GCC compatibiblity.
   const bool HasExplicitTemplateParams = Tok.is(tok::less);
   ParseScope TemplateParamScope(this, Scope::TemplateParamScope,
                                 /*EnteredScope=*/HasExplicitTemplateParams);
   if (HasExplicitTemplateParams) {
     Diag(Tok, getLangOpts().CPlusPlus2a

clang/lib/Parse/ParsePragma.cpp

if (ExpectAndConsume(tok::r_paren))
       return SkipToEnd();
   } else if (Tok.is(tok::kw___declspec)) {
     ParseMicrosoftDeclSpecs(Attrs);
   } else {
     Diag(Tok, diag::err_pragma_attribute_expected_attribute_syntax);
     if (Tok.getIdentifierInfo()) {
       // If we suspect that this is an attribute suggest the use of
       // '__attribute__'.
-      if (ParsedAttr::getKind(Tok.getIdentifierInfo(), /*ScopeName=*/nullptr,
-                              ParsedAttr::AS_GNU) !=
-          ParsedAttr::UnknownAttribute) {
+      if (ParsedAttr::getParsedKind(
+              Tok.getIdentifierInfo(), /*ScopeName=*/nullptr,
+              ParsedAttr::AS_GNU) != ParsedAttr::UnknownAttribute) {
         SourceLocation InsertStartLoc = Tok.getLocation();
         ConsumeToken();
         if (Tok.is(tok::l_paren)) {
           ConsumeAnyToken();
           SkipUntil(tok::r_paren, StopBeforeMatch);
           if (Tok.isNot(tok::r_paren))
             return SkipToEnd();
         }
if (Attrs.size() > 1) {
     Diag(Loc, diag::err_pragma_attribute_multiple_attributes);
     SkipToEnd();
     return;
   }
 
   ParsedAttr &Attribute = *Attrs.begin();
   if (!Attribute.isSupportedByPragmaAttribute()) {
     Diag(PragmaLoc, diag::err_pragma_attribute_unsupported_attribute)
-        << Attribute.getName();
+        << Attribute;
     SkipToEnd();
     return;
   }
 
   // Parse the subject-list.
   if (!TryConsumeToken(tok::comma)) {
     createExpectedAttributeSubjectRulesTokenDiagnostic(
         diag::err_expected, Attribute,

clang/lib/Parse/Parser.cpp

if (Tok.isNot(tok::l_brace))
       return nullptr;
   }
 
   // Check to make sure that any normal attributes are allowed to be on
   // a definition.  Late parsed attributes are checked at the end.
   if (Tok.isNot(tok::equal)) {
     for (const ParsedAttr &AL : D.getAttributes())
       if (AL.isKnownToGCC() && !AL.isCXX11Attribute())
-        Diag(AL.getLoc(), diag::warn_attribute_on_function_definition)
-            << AL.getName();
+        Diag(AL.getLoc(), diag::warn_attribute_on_function_definition) << AL;
   }
 
   // In delayed template parsing mode, for function template we consume the
   // tokens and store them for late parsing at the end of the translation unit.
   if (getLangOpts().DelayedTemplateParsing && Tok.isNot(tok::equal) &&
       TemplateInfo.Kind == ParsedTemplateInfo::Template &&
       Actions.canDelayFunctionBody(D)) {
     MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);

clang/lib/Sema/ParsedAttr.cpp

bool ShouldNormalize =
         NormalizedScopeName == "clang"));
   if (ShouldNormalize && AttrName.size() >= 4 && AttrName.startswith("__") &&
       AttrName.endswith("__"))
     AttrName = AttrName.slice(2, AttrName.size() - 2);
 
   return AttrName;
 }
 
-ParsedAttr::Kind ParsedAttr::getKind(const IdentifierInfo *Name,
-                                     const IdentifierInfo *ScopeName,
-                                     Syntax SyntaxUsed) {
+bool AttributeCommonInfo::isGNUScope() const {
+  return ScopeName && (ScopeName->isStr("gnu") || ScopeName->isStr("__gnu__"));
+}
+AttributeCommonInfo::Kind
+AttributeCommonInfo::getParsedKind(const IdentifierInfo *Name,
   StringRef AttrName = Name->getName();
 
   SmallString<64> FullName;
   if (ScopeName)
     FullName += normalizeAttrScopeName(ScopeName->getName(), SyntaxUsed);
 
   AttrName = normalizeAttrName(AttrName, FullName, SyntaxUsed);
 
   // Ensure that in the case of C++11 attributes, we look for '::foo' if it is
   // unscoped.
   if (ScopeName || SyntaxUsed == AS_CXX11 || SyntaxUsed == AS_C2x)
     FullName += "::";
   FullName += AttrName;
 
   return ::getAttrKind(FullName, SyntaxUsed);
 }
 
-unsigned ParsedAttr::getAttributeSpellingListIndex() const {
+unsigned AttributeCommonInfo::calculateAttributeSpellingListIndex() const {
   // Both variables will be used in tablegen generated
   // attribute spell list index matching code.
-  auto Syntax = static_cast<ParsedAttr::Syntax>(SyntaxUsed);
+  auto Syntax = static_cast<ParsedAttr::Syntax>(getSyntax());
   StringRef Scope =
-      ScopeName ? normalizeAttrScopeName(ScopeName->getName(), Syntax) : "";
-  StringRef Name = normalizeAttrName(AttrName->getName(), Scope, Syntax);
+      getScopeName() ? normalizeAttrScopeName(getScopeName()->getName(), Syntax)
+                     : "";
+  StringRef Name = normalizeAttrName(getAttrName()->getName(), Scope, Syntax);
 
 #include "clang/Sema/AttrSpellingListIndex.inc"
-
 }
 
 struct ParsedAttrInfo {
   unsigned NumArgs : 4;
   unsigned OptArgs : 4;
   unsigned HasCustomParsing : 1;
   unsigned IsTargetSpecific : 1;
   unsigned IsType : 1;

clang/lib/Sema/SemaAttr.cpp

Diag(PragmaLoc, diag::warn_pragma_unused_expected_var_arg)
       << Name << SourceRange(IdTok.getLocation());
     return;
   }
 
   // Warn if this was used before being marked unused.
   if (VD->isUsed())
     Diag(PragmaLoc, diag::warn_used_but_marked_unused) << Name;
 
-  VD->addAttr(UnusedAttr::CreateImplicit(Context, UnusedAttr::GNU_unused,
-                                         IdTok.getLocation()));
+  AttributeCommonInfo Info(IdTok.getLocation(), AttributeCommonInfo::AT_Unused,
+                           AttributeCommonInfo::AS_Pragma,
+                           UnusedAttr::Pragma_unused);
+  VD->addAttr(UnusedAttr::CreateImplicit(Context, Info));
 }
 
 void Sema::AddCFAuditedAttribute(Decl *D) {
-  SourceLocation Loc = PP.getPragmaARCCFCodeAuditedLoc();
+  IdentifierInfo *Ident;
+  SourceLocation Loc;
+  std::tie(Ident, Loc) = PP.getPragmaARCCFCodeAuditedInfo();
   if (!Loc.isValid()) return;
 
   // Don't add a redundant or conflicting attribute.
   if (D->hasAttr<CFAuditedTransferAttr>() ||
       D->hasAttr<CFUnknownTransferAttr>())
     return;
 
-  D->addAttr(CFAuditedTransferAttr::CreateImplicit(Context, Loc));
+  AttributeCommonInfo Info(Ident, SourceRange(Loc),
+                           AttributeCommonInfo::AS_Pragma);
+  D->addAttr(CFAuditedTransferAttr::CreateImplicit(Context, Info));
 }
 
 namespace {
 
 Optional<attr::SubjectMatchRule>
 getParentAttrMatcherRule(attr::SubjectMatchRule Rule) {
   using namespace attr;
   switch (Rule) {
for (const auto &Rule : StrictSubjectMatchRuleSet) {
           SubjectMatchRules.push_back(Rule.first);
       }
     }
   }
 
   if (!Rules.empty()) {
     auto Diagnostic =
         Diag(PragmaLoc, diag::err_pragma_attribute_invalid_matchers)
-        << Attribute.getName();
+        << Attribute;
     SmallVector<attr::SubjectMatchRule, 2> ExtraRules;
     for (const auto &Rule : Rules) {
       ExtraRules.push_back(attr::SubjectMatchRule(Rule.first));
       Diagnostic << FixItHint::CreateRemoval(
           replacementRangeForListElement(*this, Rule.second));
     }
     Diagnostic << attrMatcherRuleListToString(ExtraRules);
   }
if (ND && ND->getExplicitVisibility(NamedDecl::VisibilityForValue))
     return;
 
   VisStack *Stack = static_cast<VisStack*>(VisContext);
   unsigned rawType = Stack->back().first;
   if (rawType == NoVisibility) return;
 
   VisibilityAttr::VisibilityType type
     = (VisibilityAttr::VisibilityType) rawType;
+
   SourceLocation loc = Stack->back().second;
 
   D->addAttr(VisibilityAttr::CreateImplicit(Context, type, loc));
 }
 
 /// FreeVisContext - Deallocate and null out VisContext.
 void Sema::FreeVisContext() {
   delete static_cast<VisStack*>(VisContext);

clang/lib/Sema/SemaDecl.cpp

static bool mergeDeclAttribute(Sema &S, NamedDecl *D,
   // This function copies an attribute Attr from a previous declaration to the
   // new declaration D if the new declaration doesn't itself have that attribute
   // yet or if that attribute allows duplicates.
   // If you're adding a new attribute that requires logic different from
   // "use explicit attribute on decl if present, else use attribute from
   // previous decl", for example if the attribute needs to be consistent
   // between redeclarations, you need to call a custom merge function here.
   InheritableAttr *NewAttr = nullptr;
-  unsigned AttrSpellingListIndex = Attr->getSpellingListIndex();
   if (const auto *AA = dyn_cast<AvailabilityAttr>(Attr))
     NewAttr = S.mergeAvailabilityAttr(
-        D, AA->getRange(), AA->getPlatform(), AA->isImplicit(),
-        AA->getIntroduced(), AA->getDeprecated(), AA->getObsoleted(),
-        AA->getUnavailable(), AA->getMessage(), AA->getStrict(),
-        AA->getReplacement(), AMK, AA->getPriority(), AttrSpellingListIndex);
+        D, *AA, AA->getPlatform(), AA->isImplicit(), AA->getIntroduced(),
+        AA->getDeprecated(), AA->getObsoleted(), AA->getUnavailable(),
+        AA->getMessage(), AA->getStrict(), AA->getReplacement(), AMK,
+        AA->getPriority());
   else if (const auto *VA = dyn_cast<VisibilityAttr>(Attr))
-    NewAttr = S.mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility(),
-                                    AttrSpellingListIndex);
+    NewAttr = S.mergeVisibilityAttr(D, *VA, VA->getVisibility());
   else if (const auto *VA = dyn_cast<TypeVisibilityAttr>(Attr))
-    NewAttr = S.mergeTypeVisibilityAttr(D, VA->getRange(), VA->getVisibility(),
-                                        AttrSpellingListIndex);
+    NewAttr = S.mergeTypeVisibilityAttr(D, *VA, VA->getVisibility());
   else if (const auto *ImportA = dyn_cast<DLLImportAttr>(Attr))
-    NewAttr = S.mergeDLLImportAttr(D, ImportA->getRange(),
-                                   AttrSpellingListIndex);
+    NewAttr = S.mergeDLLImportAttr(D, *ImportA);
   else if (const auto *ExportA = dyn_cast<DLLExportAttr>(Attr))
-    NewAttr = S.mergeDLLExportAttr(D, ExportA->getRange(),
-                                   AttrSpellingListIndex);
+    NewAttr = S.mergeDLLExportAttr(D, *ExportA);
   else if (const auto *FA = dyn_cast<FormatAttr>(Attr))
-    NewAttr = S.mergeFormatAttr(D, FA->getRange(), FA->getType(),
-                                FA->getFormatIdx(), FA->getFirstArg(),
-                                AttrSpellingListIndex);
+    NewAttr = S.mergeFormatAttr(D, *FA, FA->getType(), FA->getFormatIdx(),
+                                FA->getFirstArg());
   else if (const auto *SA = dyn_cast<SectionAttr>(Attr))
-    NewAttr = S.mergeSectionAttr(D, SA->getRange(), SA->getName(),
-                                 AttrSpellingListIndex);
+    NewAttr = S.mergeSectionAttr(D, *SA, SA->getName());
   else if (const auto *CSA = dyn_cast<CodeSegAttr>(Attr))
-    NewAttr = S.mergeCodeSegAttr(D, CSA->getRange(), CSA->getName(),
-                                 AttrSpellingListIndex);
+    NewAttr = S.mergeCodeSegAttr(D, *CSA, CSA->getName());
   else if (const auto *IA = dyn_cast<MSInheritanceAttr>(Attr))
-    NewAttr = S.mergeMSInheritanceAttr(D, IA->getRange(), IA->getBestCase(),
-                                       AttrSpellingListIndex,
+    NewAttr = S.mergeMSInheritanceAttr(D, *IA, IA->getBestCase(),
                                        IA->getSemanticSpelling());
   else if (const auto *AA = dyn_cast<AlwaysInlineAttr>(Attr))
-    NewAttr = S.mergeAlwaysInlineAttr(D, AA->getRange(),
-                                      &S.Context.Idents.get(AA->getSpelling()),
-                                      AttrSpellingListIndex);
+    NewAttr = S.mergeAlwaysInlineAttr(D, *AA,
+                                      &S.Context.Idents.get(AA->getSpelling()));
   else if (S.getLangOpts().CUDA && isa<FunctionDecl>(D) &&
            (isa<CUDAHostAttr>(Attr) || isa<CUDADeviceAttr>(Attr) ||
             isa<CUDAGlobalAttr>(Attr))) {
     // CUDA target attributes are part of function signature for
     // overloading purposes and must not be merged.
     return false;
   } else if (const auto *MA = dyn_cast<MinSizeAttr>(Attr))
-    NewAttr = S.mergeMinSizeAttr(D, MA->getRange(), AttrSpellingListIndex);
+    NewAttr = S.mergeMinSizeAttr(D, *MA);
   else if (const auto *OA = dyn_cast<OptimizeNoneAttr>(Attr))
-    NewAttr = S.mergeOptimizeNoneAttr(D, OA->getRange(), AttrSpellingListIndex);
+    NewAttr = S.mergeOptimizeNoneAttr(D, *OA);
   else if (const auto *InternalLinkageA = dyn_cast<InternalLinkageAttr>(Attr))
     NewAttr = S.mergeInternalLinkageAttr(D, *InternalLinkageA);
   else if (const auto *CommonA = dyn_cast<CommonAttr>(Attr))
     NewAttr = S.mergeCommonAttr(D, *CommonA);
   else if (isa<AlignedAttr>(Attr))
     // AlignedAttrs are handled separately, because we need to handle all
     // such attributes on a declaration at the same time.
     NewAttr = nullptr;
   else if ((isa<DeprecatedAttr>(Attr) || isa<UnavailableAttr>(Attr)) &&
            (AMK == Sema::AMK_Override ||
             AMK == Sema::AMK_ProtocolImplementation))
     NewAttr = nullptr;
   else if (const auto *UA = dyn_cast<UuidAttr>(Attr))
-    NewAttr = S.mergeUuidAttr(D, UA->getRange(), AttrSpellingListIndex,
-                              UA->getGuid());
+    NewAttr = S.mergeUuidAttr(D, *UA, UA->getGuid());
   else if (const auto *SLHA = dyn_cast<SpeculativeLoadHardeningAttr>(Attr))
     NewAttr = S.mergeSpeculativeLoadHardeningAttr(D, *SLHA);
   else if (const auto *SLHA = dyn_cast<NoSpeculativeLoadHardeningAttr>(Attr))
     NewAttr = S.mergeNoSpeculativeLoadHardeningAttr(D, *SLHA);
   else if (Attr->shouldInheritEvenIfAlreadyPresent() || !DeclHasAttr(D, Attr))
     NewAttr = cast<InheritableAttr>(Attr->clone(S.Context));
 
   if (NewAttr) {
if (!DS.getAttributes().empty()) {
     DeclSpec::TST TypeSpecType = DS.getTypeSpecType();
     if (TypeSpecType == DeclSpec::TST_class ||
         TypeSpecType == DeclSpec::TST_struct ||
         TypeSpecType == DeclSpec::TST_interface ||
         TypeSpecType == DeclSpec::TST_union ||
         TypeSpecType == DeclSpec::TST_enum) {
       for (const ParsedAttr &AL : DS.getAttributes())
         Diag(AL.getLoc(), diag::warn_declspec_attribute_ignored)
-            << AL.getName() << GetDiagnosticTypeSpecifierID(TypeSpecType);
+            << AL << GetDiagnosticTypeSpecifierID(TypeSpecType);
     }
   }
 
   return TagD;
 }
 
 /// We are trying to inject an anonymous member into the given scope;
 /// check if there's an existing declaration that can't be overloaded.
if (OldImportAttr && !HasNewAttr &&
       (!IsInline || (IsMicrosoft && IsTemplate)) && !IsStaticDataMember &&
       !NewDecl->isLocalExternDecl() && !IsQualifiedFriend) {
     if (IsMicrosoft && IsDefinition) {
       S.Diag(NewDecl->getLocation(),
              diag::warn_redeclaration_without_import_attribute)
           << NewDecl;
       S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);
       NewDecl->dropAttr<DLLImportAttr>();
-      NewDecl->addAttr(::new (S.Context) DLLExportAttr(
-          NewImportAttr->getRange(), S.Context,
-          NewImportAttr->getSpellingListIndex()));
+      NewDecl->addAttr(
+          DLLExportAttr::CreateImplicit(S.Context, NewImportAttr->getRange()));
     } else {
       S.Diag(NewDecl->getLocation(),
              diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
           << NewDecl << OldImportAttr;
       S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);
       S.Diag(OldImportAttr->getLocation(), diag::note_previous_attribute);
       OldDecl->dropAttr<DLLImportAttr>();
       NewDecl->dropAttr<DLLImportAttr>();
if (S->getFnParent() != nullptr) {
       }
 
       if (!R->isIntegralType(Context) && !R->isPointerType()) {
         Diag(D.getBeginLoc(), diag::err_asm_bad_register_type);
         NewVD->setInvalidDecl(true);
       }
     }
 
-    NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0),
-                                                Context, Label, 0));
+    NewVD->addAttr(::new (Context)
+                       AsmLabelAttr(Context, SE->getStrTokenLoc(0), Label));
   } else if (!ExtnameUndeclaredIdentifiers.empty()) {
     llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
       ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier());
     if (I != ExtnameUndeclaredIdentifiers.end()) {
       if (isDeclExternC(NewVD)) {
         NewVD->addAttr(I->second);
         ExtnameUndeclaredIdentifiers.erase(I);
       } else
FilterLookupForScope(Previous, OriginalDC, S, shouldConsiderLinkage(NewFD),
                        D.getCXXScopeSpec().isNotEmpty() ||
                        isMemberSpecialization ||
                        isFunctionTemplateSpecialization);
 
   // Handle GNU asm-label extension (encoded as an attribute).
   if (Expr *E = (Expr*) D.getAsmLabel()) {
     // The parser guarantees this is a string.
     StringLiteral *SE = cast<StringLiteral>(E);
-    NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context,
-                                                SE->getString(), 0));
+    NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getStrTokenLoc(0),
+                                                SE->getString()));
   } else if (!ExtnameUndeclaredIdentifiers.empty()) {
     llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
       ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier());
     if (I != ExtnameUndeclaredIdentifiers.end()) {
       if (isDeclExternC(NewFD)) {
         NewFD->addAttr(I->second);
         ExtnameUndeclaredIdentifiers.erase(I);
       } else
Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
   } else {
     assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&
            "Should not need args for typedef of non-prototype fn");
   }
 
   // Finally, we know we have the right number of parameters, install them.
   NewFD->setParams(Params);
 
-  if (D.getDeclSpec().isNoreturnSpecified())
-    NewFD->addAttr(
-        ::new(Context) C11NoReturnAttr(D.getDeclSpec().getNoreturnSpecLoc(),
-                                       Context, 0));
+  if (D.getDeclSpec().isNoreturnSpecified()) {
+    SourceLocation Loc = D.getDeclSpec().getNoreturnSpecLoc();
+    AttributeCommonInfo Info(SourceRange{Loc}, AttributeCommonInfo::AT_NoReturn,
+                             AttributeCommonInfo::AS_Keyword);
+    NewFD->addAttr(::new (Context) C11NoReturnAttr(Context, Info));
+  }
 
   // Functions returning a variably modified type violate C99 6.7.5.2p2
   // because all functions have linkage.
   if (!NewFD->isInvalidDecl() &&
       NewFD->getReturnType()->isVariablyModifiedType()) {
     Diag(NewFD->getLocation(), diag::err_vm_func_decl);
     NewFD->setInvalidDecl();
   }
 
   // Apply an implicit SectionAttr if '#pragma clang section text' is active
   if (PragmaClangTextSection.Valid && D.isFunctionDefinition() &&
       !NewFD->hasAttr<SectionAttr>()) {
-    NewFD->addAttr(PragmaClangTextSectionAttr::CreateImplicit(Context,
-                                                 PragmaClangTextSection.SectionName,
-                                                 PragmaClangTextSection.PragmaLocation));
+    AttributeCommonInfo Info(SourceRange{PragmaClangTextSection.PragmaLocation},
+                             AttributeCommonInfo::AT_PragmaClangTextSection,
+                             AttributeCommonInfo::AS_Pragma);
+    NewFD->addAttr(PragmaClangTextSectionAttr::CreateImplicit(
+        Context, PragmaClangTextSection.SectionName, Info));
   }
 
   // Apply an implicit SectionAttr if #pragma code_seg is active.
   if (CodeSegStack.CurrentValue && D.isFunctionDefinition() &&
       !NewFD->hasAttr<SectionAttr>()) {
-    NewFD->addAttr(
-        SectionAttr::CreateImplicit(Context, SectionAttr::Declspec_allocate,
-                                    CodeSegStack.CurrentValue->getString(),
-                                    CodeSegStack.CurrentPragmaLocation));
+    AttributeCommonInfo Info(SourceRange{CodeSegStack.CurrentPragmaLocation},
+                             AttributeCommonInfo::AT_Section,
+                             AttributeCommonInfo::AS_Pragma,
+                             SectionAttr::Declspec_allocate);
+    NewFD->addAttr(SectionAttr::CreateImplicit(
+        Context, CodeSegStack.CurrentValue->getString(), Info));
     if (UnifySection(CodeSegStack.CurrentValue->getString(),
                      ASTContext::PSF_Implicit | ASTContext::PSF_Execute |
                          ASTContext::PSF_Read,
                      NewFD))
       NewFD->dropAttr<SectionAttr>();
   }
 
   // Apply an implicit CodeSegAttr from class declspec or

 /// \returns A CodeSegAttr or SectionAttr to apply to the function or
 ///          nullptr if no attribute should be added.
 Attr *Sema::getImplicitCodeSegOrSectionAttrForFunction(const FunctionDecl *FD,
                                                        bool IsDefinition) {
   if (Attr *A = getImplicitCodeSegAttrFromClass(*this, FD))
     return A;
   if (!FD->hasAttr<SectionAttr>() && IsDefinition &&
       CodeSegStack.CurrentValue) {
-    return SectionAttr::CreateImplicit(getASTContext(),
-                                       SectionAttr::Declspec_allocate,
-                                       CodeSegStack.CurrentValue->getString(),
-                                       CodeSegStack.CurrentPragmaLocation);
+    AttributeCommonInfo Info(SourceRange{CodeSegStack.CurrentPragmaLocation},
+                             AttributeCommonInfo::AT_Section,
+                             AttributeCommonInfo::AS_Pragma,
+                             SectionAttr::Declspec_allocate);
+    return SectionAttr::CreateImplicit(
+        getASTContext(), CodeSegStack.CurrentValue->getString(), Info);
   }
   return nullptr;
 }
 
 /// Determines if we can perform a correct type check for \p D as a
 /// redeclaration of \p PrevDecl. If not, we can generally still perform a
 /// best-effort check.
 ///
if (GlobalStorage && var->isThisDeclarationADefinition() &&
     else if (!var->getInit()) {
       Stack = &BSSSegStack;
       SectionFlags |= ASTContext::PSF_Write;
     } else {
       Stack = &DataSegStack;
       SectionFlags |= ASTContext::PSF_Write;
     }
     if (Stack->CurrentValue && !var->hasAttr<SectionAttr>()) {
+      AttributeCommonInfo Info(SourceRange{Stack->CurrentPragmaLocation},
+                               AttributeCommonInfo::AT_Section,
+                               AttributeCommonInfo::AS_Pragma,
+                               SectionAttr::Declspec_allocate);
       var->addAttr(SectionAttr::CreateImplicit(
-          Context, SectionAttr::Declspec_allocate,
-          Stack->CurrentValue->getString(), Stack->CurrentPragmaLocation));
+          Context, Stack->CurrentValue->getString(), Info));
     }
     if (const SectionAttr *SA = var->getAttr<SectionAttr>())
       if (UnifySection(SA->getName(), SectionFlags, var))
         var->dropAttr<SectionAttr>();
 
     // Apply the init_seg attribute if this has an initializer.  If the
     // initializer turns out to not be dynamic, we'll end up ignoring this
     // attribute.
-    if (CurInitSeg && var->getInit())
-      var->addAttr(InitSegAttr::CreateImplicit(Context, CurInitSeg->getString(),
-                                               CurInitSegLoc));
+    if (CurInitSeg && var->getInit()) {
+      AttributeCommonInfo Info(SourceRange{CurInitSegLoc},
+                               AttributeCommonInfo::UnknownAttribute,
+                               AttributeCommonInfo::AS_Pragma);
+      var->addAttr(
+          InitSegAttr::CreateImplicit(Context, CurInitSeg->getString(), Info));
+    }
   }
 
   // All the following checks are C++ only.
   if (!getLangOpts().CPlusPlus) {
       // If this variable must be emitted, add it as an initializer for the
       // current module.
      if (Context.DeclMustBeEmitted(var) && !ModuleScopes.empty())
        Context.addModuleInitializer(ModuleScopes.back().Module, var);
if (!FD)
     return;
 
   // Static locals inherit dll attributes from their function.
   if (Attr *A = getDLLAttr(FD)) {
     auto *NewAttr = cast<InheritableAttr>(A->clone(getASTContext()));
     NewAttr->setInherited(true);
     VD->addAttr(NewAttr);
   } else if (Attr *A = FD->getAttr<DLLExportStaticLocalAttr>()) {
-    auto *NewAttr = ::new (getASTContext()) DLLExportAttr(A->getRange(),
-                                                          getASTContext(),
-                                                          A->getSpellingListIndex());
+    auto *NewAttr = DLLExportAttr::CreateImplicit(getASTContext(), *A);
     NewAttr->setInherited(true);
     VD->addAttr(NewAttr);
 
     // Export this function to enforce exporting this static variable even
     // if it is not used in this compilation unit.
     if (!FD->hasAttr<DLLExportAttr>())
       FD->addAttr(NewAttr);
 
   } else if (Attr *A = FD->getAttr<DLLImportStaticLocalAttr>()) {
-    auto *NewAttr = ::new (getASTContext()) DLLImportAttr(A->getRange(),
-                                                          getASTContext(),
-                                                          A->getSpellingListIndex());
+    auto *NewAttr = DLLImportAttr::CreateImplicit(getASTContext(), *A);
     NewAttr->setInherited(true);
     VD->addAttr(NewAttr);
   }
 }
 
 /// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform
 /// any semantic actions necessary after any initializer has been attached.
 void Sema::FinalizeDeclaration(Decl *ThisDecl) {
   // Note that we are no longer parsing the initializer for this declaration.
   ParsingInitForAutoVars.erase(ThisDecl);
 
   VarDecl *VD = dyn_cast_or_null<VarDecl>(ThisDecl);
   if (!VD)
     return;
 
   // Apply an implicit SectionAttr if '#pragma clang section bss|data|rodata' is active
   if (VD->hasGlobalStorage() && VD->isThisDeclarationADefinition() &&
       !inTemplateInstantiation() && !VD->hasAttr<SectionAttr>()) {
-    if (PragmaClangBSSSection.Valid)
-      VD->addAttr(PragmaClangBSSSectionAttr::CreateImplicit(Context,
-                                                            PragmaClangBSSSection.SectionName,
-                                                            PragmaClangBSSSection.PragmaLocation));
-    if (PragmaClangDataSection.Valid)
-      VD->addAttr(PragmaClangDataSectionAttr::CreateImplicit(Context,
-                                                             PragmaClangDataSection.SectionName,
-                                                             PragmaClangDataSection.PragmaLocation));
-    if (PragmaClangRodataSection.Valid)
-      VD->addAttr(PragmaClangRodataSectionAttr::CreateImplicit(Context,
-                                                               PragmaClangRodataSection.SectionName,
-                                                               PragmaClangRodataSection.PragmaLocation));
+    if (PragmaClangBSSSection.Valid) {
+      AttributeCommonInfo Info{PragmaClangBSSSection.PragmaLocation,
+                               AttributeCommonInfo::AT_PragmaClangBSSSection,
+                               AttributeCommonInfo::AS_Pragma};
+      VD->addAttr(PragmaClangBSSSectionAttr::CreateImplicit(
+          Context, PragmaClangBSSSection.SectionName, Info));
+    }
+    if (PragmaClangDataSection.Valid) {
+      AttributeCommonInfo Info{PragmaClangDataSection.PragmaLocation,
+                               AttributeCommonInfo::AT_PragmaClangDataSection,
+                               AttributeCommonInfo::AS_Pragma};
+      VD->addAttr(PragmaClangDataSectionAttr::CreateImplicit(
+          Context, PragmaClangDataSection.SectionName, Info));
+    }
+    if (PragmaClangRodataSection.Valid) {
+      AttributeCommonInfo Info{PragmaClangRodataSection.PragmaLocation,
+                               AttributeCommonInfo::AT_PragmaClangRodataSection,
+                               AttributeCommonInfo::AS_Pragma};
+      VD->addAttr(PragmaClangRodataSectionAttr::CreateImplicit(
+          Context, PragmaClangRodataSection.SectionName, Info));
+    }
   }
 
   if (auto *DD = dyn_cast<DecompositionDecl>(ThisDecl)) {
     for (auto *BD : DD->bindings()) {
       FinalizeDeclaration(BD);
     }
   }
 
if (unsigned BuiltinID = FD->getBuiltinID()) {
     bool HasVAListArg;
     if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) {
       if (!FD->hasAttr<FormatAttr>()) {
         const char *fmt = "printf";
         unsigned int NumParams = FD->getNumParams();
         if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf)
             FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType())
           fmt = "NSString";
-        FD->addAttr(FormatAttr::CreateImplicit(Context,
-                                               &Context.Idents.get(fmt),
-                                               FormatIdx+1,
-                                               HasVAListArg ? 0 : FormatIdx+2,
-                                               FD->getLocation()));
+        FD->addAttr(FormatAttr::CreateImplicit(
+            Context, &Context.Idents.get(fmt), FormatIdx + 1,
+            HasVAListArg ? 0 : FormatIdx + 2, FD->getLocation()));
       }
     }
     if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx,
                                              HasVAListArg)) {
      if (!FD->hasAttr<FormatAttr>())
-       FD->addAttr(FormatAttr::CreateImplicit(Context,
-                                              &Context.Idents.get("scanf"),
-                                              FormatIdx+1,
-                                              HasVAListArg ? 0 : FormatIdx+2,
-                                              FD->getLocation()));
+       FD->addAttr(FormatAttr::CreateImplicit(
+           Context, &Context.Idents.get("scanf"), FormatIdx + 1,
+           HasVAListArg ? 0 : FormatIdx + 2, FD->getLocation()));
     }
 
     // Handle automatically recognized callbacks.
     SmallVector<int, 4> Encoding;
     if (!FD->hasAttr<CallbackAttr>() &&
         Context.BuiltinInfo.performsCallback(BuiltinID, Encoding))
       FD->addAttr(CallbackAttr::CreateImplicit(
           Context, Encoding.data(), Encoding.size(), FD->getLocation()));
if ((Trip.isGNUEnvironment() || Trip.isAndroid() || Trip.isOSMSVCRT()) &&
         break;
       default:
         break;
       }
     }
 
     if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) &&
         !FD->hasAttr<ReturnsTwiceAttr>())
-      FD->addAttr(ReturnsTwiceAttr::CreateImplicit(Context,
-                                         FD->getLocation()));
+      FD->addAttr(ReturnsTwiceAttr::CreateImplicit(Context, FD->getLocation()));
     if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->hasAttr<NoThrowAttr>())
       FD->addAttr(NoThrowAttr::CreateImplicit(Context, FD->getLocation()));
     if (Context.BuiltinInfo.isPure(BuiltinID) && !FD->hasAttr<PureAttr>())
       FD->addAttr(PureAttr::CreateImplicit(Context, FD->getLocation()));
     if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->hasAttr<ConstAttr>())
       FD->addAttr(ConstAttr::CreateImplicit(Context, FD->getLocation()));
     if (getLangOpts().CUDA && Context.BuiltinInfo.isTSBuiltin(BuiltinID) &&
         !FD->hasAttr<CUDADeviceAttr>() && !FD->hasAttr<CUDAHostAttr>()) {
if ((!getLangOpts().CPlusPlus &&
     // about.
   } else
     return;
 
   if (Name->isStr("asprintf") || Name->isStr("vasprintf")) {
     // FIXME: asprintf and vasprintf aren't C99 functions. Should they be
     // target-specific builtins, perhaps?
     if (!FD->hasAttr<FormatAttr>())
-      FD->addAttr(FormatAttr::CreateImplicit(Context,
-                                             &Context.Idents.get("printf"), 2,
-                                             Name->isStr("vasprintf") ? 0 : 3,
-                                             FD->getLocation()));
+      FD->addAttr(FormatAttr::CreateImplicit(
+          Context, &Context.Idents.get("printf"), 2,
+          Name->isStr("vasprintf") ? 0 : 3, FD->getLocation()));
   }
 
   if (Name->isStr("__CFStringMakeConstantString")) {
     // We already have a __builtin___CFStringMakeConstantString,
     // but builds that use -fno-constant-cfstrings don't go through that.
     if (!FD->hasAttr<FormatArgAttr>())
       FD->addAttr(FormatArgAttr::CreateImplicit(Context, ParamIdx(1, FD),
                                                 FD->getLocation()));
void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD,
   AdjustDeclIfTemplate(TagD);
   CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD);
 
   FieldCollector->StartClass();
 
   if (!Record->getIdentifier())
     return;
 
-  if (FinalLoc.isValid())
-    Record->addAttr(new (Context)
-                    FinalAttr(FinalLoc, Context, IsFinalSpelledSealed));
+  if (FinalLoc.isValid()) {
+    AttributeCommonInfo Info(FinalLoc, AttributeCommonInfo::UnknownAttribute,
+                             AttributeCommonInfo::AS_Keyword,
+                             IsFinalSpelledSealed);
+
+    Record->addAttr(new (Context) FinalAttr(Context, Info));
+  }
 
   // C++ [class]p2:
   //   [...] The class-name is also inserted into the scope of the
   //   class itself; this is known as the injected-class-name. For
   //   purposes of access checking, the injected-class-name is treated
   //   as if it were a public member name.
   CXXRecordDecl *InjectedClassName = CXXRecordDecl::Create(
       Context, Record->getTagKind(), CurContext, Record->getBeginLoc(),
if (FDTy->isFunctionType()) {
       // so we just make the field unavailable.
       // FIXME: that's really not sufficient; we need to make the type
       // itself invalid to, say, initialize or copy.
       QualType T = FD->getType();
       if (T.hasNonTrivialObjCLifetime()) {
         SourceLocation loc = FD->getLocation();
         if (getSourceManager().isInSystemHeader(loc)) {
           if (!FD->hasAttr<UnavailableAttr>()) {
-            FD->addAttr(UnavailableAttr::CreateImplicit(Context, "",
-                          UnavailableAttr::IR_ARCFieldWithOwnership, loc));
+            FD->addAttr(UnavailableAttr::CreateImplicit(
+                Context, "", UnavailableAttr::IR_ARCFieldWithOwnership, loc));
           }
         } else {
           Diag(FD->getLocation(), diag::err_arc_objc_object_in_tag)
             << T->isBlockPointerType() << Record->getTagKind();
         }
         ObjCFieldLifetimeErrReported = true;
       }
     } else if (getLangOpts().ObjC &&

 
 void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name,
                                       IdentifierInfo* AliasName,
                                       SourceLocation PragmaLoc,
                                       SourceLocation NameLoc,
                                       SourceLocation AliasNameLoc) {
   NamedDecl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc,
                                          LookupOrdinaryName);
+  AttributeCommonInfo Info(AliasName, SourceRange(AliasNameLoc),
+                           AttributeCommonInfo::AS_Pragma);
   AsmLabelAttr *Attr =
-      AsmLabelAttr::CreateImplicit(Context, AliasName->getName(), AliasNameLoc);
+      AsmLabelAttr::CreateImplicit(Context, AliasName->getName(), Info);
 
   // If a declaration that:
   // 1) declares a function or a variable
   // 2) has external linkage
   // already exists, add a label attribute to it.
   if (PrevDecl && (isa<FunctionDecl>(PrevDecl) || isa<VarDecl>(PrevDecl))) {
     if (isDeclExternC(PrevDecl))
       PrevDecl->addAttr(Attr);
     else
       Diag(PrevDecl->getLocation(), diag::warn_redefine_extname_not_applied)
           << /*Variable*/(isa<FunctionDecl>(PrevDecl) ? 0 : 1) << PrevDecl;
   // Otherwise, add a label atttibute to ExtnameUndeclaredIdentifiers.
   } else
     (void)ExtnameUndeclaredIdentifiers.insert(std::make_pair(Name, Attr));
 }
 
 void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
                              SourceLocation PragmaLoc,
                              SourceLocation NameLoc) {
   Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName);
 
   if (PrevDecl) {
-    PrevDecl->addAttr(WeakAttr::CreateImplicit(Context, PragmaLoc));
+    AttributeCommonInfo Info(SourceRange(PragmaLoc),
+                             AttributeCommonInfo::AT_Weak,
+                             AttributeCommonInfo::AS_Pragma);
+    PrevDecl->addAttr(WeakAttr::CreateImplicit(Context, Info));
   } else {
     (void)WeakUndeclaredIdentifiers.insert(
       std::pair<IdentifierInfo*,WeakInfo>
         (Name, WeakInfo((IdentifierInfo*)nullptr, NameLoc)));
   }
 }
 
 void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,

clang/lib/Sema/SemaDeclAttr.cpp

bool Sema::checkStringLiteralArgumentAttr(const ParsedAttr &AL, unsigned ArgNum,
 
   Str = Literal->getString();
   return true;
 }
 
 /// Applies the given attribute to the Decl without performing any
 /// additional semantic checking.
 template <typename AttrType>
-static void handleSimpleAttribute(Sema &S, Decl *D, SourceRange SR,
-                                  unsigned SpellingIndex) {
-  D->addAttr(::new (S.Context) AttrType(SR, S.Context, SpellingIndex));
+static void handleSimpleAttribute(Sema &S, Decl *D,
+                                  const AttributeCommonInfo &CI) {
+  D->addAttr(::new (S.Context) AttrType(S.Context, CI));
 }
 
-template <typename AttrType>
-static void handleSimpleAttribute(Sema &S, Decl *D, const ParsedAttr &AL) {
-  handleSimpleAttribute<AttrType>(S, D, AL.getRange(),
-                                  AL.getAttributeSpellingListIndex());
-}
-
-
 template <typename... DiagnosticArgs>
 static const Sema::SemaDiagnosticBuilder&
 appendDiagnostics(const Sema::SemaDiagnosticBuilder &Bldr) {
   return Bldr;
 }
 
 template <typename T, typename... DiagnosticArgs>
 static const Sema::SemaDiagnosticBuilder&
 appendDiagnostics(const Sema::SemaDiagnosticBuilder &Bldr, T &&ExtraArg,
                   DiagnosticArgs &&... ExtraArgs) {
   return appendDiagnostics(Bldr << std::forward<T>(ExtraArg),
                            std::forward<DiagnosticArgs>(ExtraArgs)...);
 }
 
 /// Add an attribute {@code AttrType} to declaration {@code D}, provided that
 /// {@code PassesCheck} is true.
 /// Otherwise, emit diagnostic {@code DiagID}, passing in all parameters
 /// specified in {@code ExtraArgs}.
 template <typename AttrType, typename... DiagnosticArgs>
-static void
-handleSimpleAttributeOrDiagnose(Sema &S, Decl *D, SourceRange SR,
-                               unsigned SpellingIndex,
-                               bool PassesCheck,
-                               unsigned DiagID, DiagnosticArgs&&... ExtraArgs) {
+static void handleSimpleAttributeOrDiagnose(Sema &S, Decl *D,
+                                            const AttributeCommonInfo &CI,
+                                            bool PassesCheck, unsigned DiagID,
+                                            DiagnosticArgs &&... ExtraArgs) {
   if (!PassesCheck) {
     Sema::SemaDiagnosticBuilder DB = S.Diag(D->getBeginLoc(), DiagID);
     appendDiagnostics(DB, std::forward<DiagnosticArgs>(ExtraArgs)...);
     return;
   }
-  handleSimpleAttribute<AttrType>(S, D, SR, SpellingIndex);
-}
-
-template <typename AttrType, typename... DiagnosticArgs>
-static void
-handleSimpleAttributeOrDiagnose(Sema &S, Decl *D, const ParsedAttr &AL,
-                               bool PassesCheck,
-                               unsigned DiagID,
-                               DiagnosticArgs&&... ExtraArgs) {
-  return handleSimpleAttributeOrDiagnose<AttrType>(
-      S, D, AL.getRange(), AL.getAttributeSpellingListIndex(), PassesCheck,
-      DiagID, std::forward<DiagnosticArgs>(ExtraArgs)...);
+  handleSimpleAttribute<AttrType>(S, D, CI);
 }
 
 template <typename AttrType>
 static void handleSimpleAttributeWithExclusions(Sema &S, Decl *D,
                                                 const ParsedAttr &AL) {
   handleSimpleAttribute<AttrType>(S, D, AL);
 }
 

 //===----------------------------------------------------------------------===//
 // Attribute Implementations
 //===----------------------------------------------------------------------===//
 
 static void handlePtGuardedVarAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!threadSafetyCheckIsPointer(S, D, AL))
     return;
 
-  D->addAttr(::new (S.Context)
-             PtGuardedVarAttr(AL.getRange(), S.Context,
-                              AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) PtGuardedVarAttr(S.Context, AL));
 }
 
 static bool checkGuardedByAttrCommon(Sema &S, Decl *D, const ParsedAttr &AL,
                                      Expr *&Arg) {
   SmallVector<Expr *, 1> Args;
   // check that all arguments are lockable objects
   checkAttrArgsAreCapabilityObjs(S, D, AL, Args);
   unsigned Size = Args.size();
   if (Size != 1)
     return false;
 
   Arg = Args[0];
 
   return true;
 }
 
 static void handleGuardedByAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   Expr *Arg = nullptr;
   if (!checkGuardedByAttrCommon(S, D, AL, Arg))
     return;
 
-  D->addAttr(::new (S.Context) GuardedByAttr(
-      AL.getRange(), S.Context, Arg, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) GuardedByAttr(S.Context, AL, Arg));
 }
 
 static void handlePtGuardedByAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   Expr *Arg = nullptr;
   if (!checkGuardedByAttrCommon(S, D, AL, Arg))
     return;
 
   if (!threadSafetyCheckIsPointer(S, D, AL))
     return;
 
-  D->addAttr(::new (S.Context) PtGuardedByAttr(
-      AL.getRange(), S.Context, Arg, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) PtGuardedByAttr(S.Context, AL, Arg));
 }
 
 static bool checkAcquireOrderAttrCommon(Sema &S, Decl *D, const ParsedAttr &AL,
                                         SmallVectorImpl<Expr *> &Args) {
   if (!checkAttributeAtLeastNumArgs(S, AL, 1))
     return false;
 
   // Check that this attribute only applies to lockable types.

 }
 
 static void handleAcquiredAfterAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   SmallVector<Expr *, 1> Args;
   if (!checkAcquireOrderAttrCommon(S, D, AL, Args))
     return;
 
   Expr **StartArg = &Args[0];
-  D->addAttr(::new (S.Context) AcquiredAfterAttr(
-      AL.getRange(), S.Context, StartArg, Args.size(),
-      AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context)
+                 AcquiredAfterAttr(S.Context, AL, StartArg, Args.size()));
 }
 
 static void handleAcquiredBeforeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   SmallVector<Expr *, 1> Args;
   if (!checkAcquireOrderAttrCommon(S, D, AL, Args))
     return;
 
   Expr **StartArg = &Args[0];
-  D->addAttr(::new (S.Context) AcquiredBeforeAttr(
-      AL.getRange(), S.Context, StartArg, Args.size(),
-      AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context)
+                 AcquiredBeforeAttr(S.Context, AL, StartArg, Args.size()));
 }
 
 static bool checkLockFunAttrCommon(Sema &S, Decl *D, const ParsedAttr &AL,
                                    SmallVectorImpl<Expr *> &Args) {
   // zero or more arguments ok
   // check that all arguments are lockable objects
   checkAttrArgsAreCapabilityObjs(S, D, AL, Args, 0, /*ParamIdxOk=*/true);
 
   return true;
 }
 
 static void handleAssertSharedLockAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   SmallVector<Expr *, 1> Args;
   if (!checkLockFunAttrCommon(S, D, AL, Args))
     return;
 
   unsigned Size = Args.size();
   Expr **StartArg = Size == 0 ? nullptr : &Args[0];
   D->addAttr(::new (S.Context)
-                 AssertSharedLockAttr(AL.getRange(), S.Context, StartArg, Size,
-                                      AL.getAttributeSpellingListIndex()));
+                 AssertSharedLockAttr(S.Context, AL, StartArg, Size));
 }
 
 static void handleAssertExclusiveLockAttr(Sema &S, Decl *D,
                                           const ParsedAttr &AL) {
   SmallVector<Expr *, 1> Args;
   if (!checkLockFunAttrCommon(S, D, AL, Args))
     return;
 
   unsigned Size = Args.size();
   Expr **StartArg = Size == 0 ? nullptr : &Args[0];
-  D->addAttr(::new (S.Context) AssertExclusiveLockAttr(
-      AL.getRange(), S.Context, StartArg, Size,
-      AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context)
+                 AssertExclusiveLockAttr(S.Context, AL, StartArg, Size));
 }
 
 /// Checks to be sure that the given parameter number is in bounds, and
 /// is an integral type. Will emit appropriate diagnostics if this returns
 /// false.
 ///
 /// AttrArgNo is used to actually retrieve the argument, so it's base-0.
 template <typename AttrInfo>
if (AL.getNumArgs() == 2) {
     if (!checkPositiveIntArgument(S, AL, NumberExpr, Val, /*Idx=*/2))
       return;
     if (!checkParamIsIntegerType(S, FD, AL, /*AttrArgNo=*/1))
       return;
     NumberArgNo = ParamIdx(Val, D);
   }
 
   D->addAttr(::new (S.Context)
-                 AllocSizeAttr(AL.getRange(), S.Context, SizeArgNo, NumberArgNo,
-                               AL.getAttributeSpellingListIndex()));
+                 AllocSizeAttr(S.Context, AL, SizeArgNo, NumberArgNo));
 }
 
 static bool checkTryLockFunAttrCommon(Sema &S, Decl *D, const ParsedAttr &AL,
                                       SmallVectorImpl<Expr *> &Args) {
   if (!checkAttributeAtLeastNumArgs(S, AL, 1))
     return false;
 
   if (!isIntOrBool(AL.getArgAsExpr(0))) {

 
 static void handleSharedTrylockFunctionAttr(Sema &S, Decl *D,
                                             const ParsedAttr &AL) {
   SmallVector<Expr*, 2> Args;
   if (!checkTryLockFunAttrCommon(S, D, AL, Args))
     return;
 
   D->addAttr(::new (S.Context) SharedTrylockFunctionAttr(
-      AL.getRange(), S.Context, AL.getArgAsExpr(0), Args.data(), Args.size(),
-      AL.getAttributeSpellingListIndex()));
+      S.Context, AL, AL.getArgAsExpr(0), Args.data(), Args.size()));
 }
 
 static void handleExclusiveTrylockFunctionAttr(Sema &S, Decl *D,
                                                const ParsedAttr &AL) {
   SmallVector<Expr*, 2> Args;
   if (!checkTryLockFunAttrCommon(S, D, AL, Args))
     return;
 
   D->addAttr(::new (S.Context) ExclusiveTrylockFunctionAttr(
-      AL.getRange(), S.Context, AL.getArgAsExpr(0), Args.data(),
-      Args.size(), AL.getAttributeSpellingListIndex()));
+      S.Context, AL, AL.getArgAsExpr(0), Args.data(), Args.size()));
 }
 
 static void handleLockReturnedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // check that the argument is lockable object
   SmallVector<Expr*, 1> Args;
   checkAttrArgsAreCapabilityObjs(S, D, AL, Args);
   unsigned Size = Args.size();
   if (Size == 0)
     return;
 
-  D->addAttr(::new (S.Context)
-             LockReturnedAttr(AL.getRange(), S.Context, Args[0],
-                              AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) LockReturnedAttr(S.Context, AL, Args[0]));
 }
 
 static void handleLocksExcludedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!checkAttributeAtLeastNumArgs(S, AL, 1))
     return;
 
   // check that all arguments are lockable objects
   SmallVector<Expr*, 1> Args;
   checkAttrArgsAreCapabilityObjs(S, D, AL, Args);
   unsigned Size = Args.size();
   if (Size == 0)
     return;
   Expr **StartArg = &Args[0];
 
   D->addAttr(::new (S.Context)
-             LocksExcludedAttr(AL.getRange(), S.Context, StartArg, Size,
-                               AL.getAttributeSpellingListIndex()));
+                 LocksExcludedAttr(S.Context, AL, StartArg, Size));
 }
 
 static bool checkFunctionConditionAttr(Sema &S, Decl *D, const ParsedAttr &AL,
                                        Expr *&Cond, StringRef &Msg) {
   Cond = AL.getArgAsExpr(0);
   if (!Cond->isTypeDependent()) {
     ExprResult Converted = S.PerformContextuallyConvertToBool(Cond);
     if (Converted.isInvalid())

 }
 
 static void handleEnableIfAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   S.Diag(AL.getLoc(), diag::ext_clang_enable_if);
 
   Expr *Cond;
   StringRef Msg;
   if (checkFunctionConditionAttr(S, D, AL, Cond, Msg))
-    D->addAttr(::new (S.Context)
-                   EnableIfAttr(AL.getRange(), S.Context, Cond, Msg,
-                                AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) EnableIfAttr(S.Context, AL, Cond, Msg));
 }
 
 namespace {
 /// Determines if a given Expr references any of the given function's
 /// ParmVarDecls, or the function's implicit `this` parameter (if applicable).
 class ArgumentDependenceChecker
     : public RecursiveASTVisitor<ArgumentDependenceChecker> {
 #ifndef NDEBUG
S.Diag(AL.getArgAsExpr(2)->getBeginLoc(),
            diag::err_diagnose_if_invalid_diagnostic_type);
     return;
   }
 
   bool ArgDependent = false;
   if (const auto *FD = dyn_cast<FunctionDecl>(D))
     ArgDependent = ArgumentDependenceChecker(FD).referencesArgs(Cond);
   D->addAttr(::new (S.Context) DiagnoseIfAttr(
-      AL.getRange(), S.Context, Cond, Msg, DiagType, ArgDependent,
-      cast<NamedDecl>(D), AL.getAttributeSpellingListIndex()));
+      S.Context, AL, Cond, Msg, DiagType, ArgDependent, cast<NamedDecl>(D)));
 }
 
 static void handlePassObjectSizeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (D->hasAttr<PassObjectSizeAttr>()) {
     S.Diag(D->getBeginLoc(), diag::err_attribute_only_once_per_parameter) << AL;
     return;
   }
 
static void handlePassObjectSizeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // kindness to users, we allow the parameter to be non-const for declarations.
   // At this point, we have no clue if `D` belongs to a function declaration or
   // definition, so we defer the constness check until later.
   if (!cast<ParmVarDecl>(D)->getType()->isPointerType()) {
     S.Diag(D->getBeginLoc(), diag::err_attribute_pointers_only) << AL << 1;
     return;
   }
 
-  D->addAttr(::new (S.Context) PassObjectSizeAttr(
-      AL.getRange(), S.Context, (int)Type, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) PassObjectSizeAttr(S.Context, AL, (int)Type));
 }
 
 static void handleConsumableAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   ConsumableAttr::ConsumedState DefaultState;
 
   if (AL.isArgIdent(0)) {
     IdentifierLoc *IL = AL.getArgAsIdent(0);
     if (!ConsumableAttr::ConvertStrToConsumedState(IL->Ident->getName(),
                                                    DefaultState)) {
       S.Diag(IL->Loc, diag::warn_attribute_type_not_supported) << AL
                                                                << IL->Ident;
       return;
     }
   } else {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_type)
         << AL << AANT_ArgumentIdentifier;
     return;
   }
 
-  D->addAttr(::new (S.Context)
-             ConsumableAttr(AL.getRange(), S.Context, DefaultState,
-                            AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ConsumableAttr(S.Context, AL, DefaultState));
 }
 
 static bool checkForConsumableClass(Sema &S, const CXXMethodDecl *MD,
                                     const ParsedAttr &AL) {
   QualType ThisType = MD->getThisType()->getPointeeType();
 
   if (const CXXRecordDecl *RD = ThisType->getAsCXXRecordDecl()) {
     if (!RD->hasAttr<ConsumableAttr>()) {
if (!CallableWhenAttr::ConvertStrToConsumedState(StateString,
       S.Diag(Loc, diag::warn_attribute_type_not_supported) << AL << StateString;
       return;
     }
 
     States.push_back(CallableState);
   }
 
   D->addAttr(::new (S.Context)
-             CallableWhenAttr(AL.getRange(), S.Context, States.data(),
-               States.size(), AL.getAttributeSpellingListIndex()));
+                 CallableWhenAttr(S.Context, AL, States.data(), States.size()));
 }
 
 static void handleParamTypestateAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   ParamTypestateAttr::ConsumedState ParamState;
 
   if (AL.isArgIdent(0)) {
     IdentifierLoc *Ident = AL.getArgAsIdent(0);
     StringRef StateString = Ident->Ident->getName();
static void handleParamTypestateAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   //const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl();
   //
   //if (!RD || !RD->hasAttr<ConsumableAttr>()) {
   //    S.Diag(AL.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
   //      ReturnType.getAsString();
   //    return;
   //}
 
-  D->addAttr(::new (S.Context)
-             ParamTypestateAttr(AL.getRange(), S.Context, ParamState,
-                                AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ParamTypestateAttr(S.Context, AL, ParamState));
 }
 
 static void handleReturnTypestateAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   ReturnTypestateAttr::ConsumedState ReturnState;
 
   if (AL.isArgIdent(0)) {
     IdentifierLoc *IL = AL.getArgAsIdent(0);
     if (!ReturnTypestateAttr::ConvertStrToConsumedState(IL->Ident->getName(),
static void handleReturnTypestateAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   //const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl();
   //
   //if (!RD || !RD->hasAttr<ConsumableAttr>()) {
   //    S.Diag(Attr.getLoc(), diag::warn_return_state_for_unconsumable_type) <<
   //      ReturnType.getAsString();
   //    return;
   //}
 
-  D->addAttr(::new (S.Context)
-                 ReturnTypestateAttr(AL.getRange(), S.Context, ReturnState,
-                                     AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ReturnTypestateAttr(S.Context, AL, ReturnState));
 }
 
 static void handleSetTypestateAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), AL))
     return;
 
   SetTypestateAttr::ConsumedState NewState;
   if (AL.isArgIdent(0)) {
     IdentifierLoc *Ident = AL.getArgAsIdent(0);
     StringRef Param = Ident->Ident->getName();
     if (!SetTypestateAttr::ConvertStrToConsumedState(Param, NewState)) {
       S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported) << AL
                                                                   << Param;
       return;
     }
   } else {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_type)
         << AL << AANT_ArgumentIdentifier;
     return;
   }
 
-  D->addAttr(::new (S.Context)
-             SetTypestateAttr(AL.getRange(), S.Context, NewState,
-                              AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) SetTypestateAttr(S.Context, AL, NewState));
 }
 
 static void handleTestTypestateAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!checkForConsumableClass(S, cast<CXXMethodDecl>(D), AL))
     return;
 
   TestTypestateAttr::ConsumedState TestState;
   if (AL.isArgIdent(0)) {
     IdentifierLoc *Ident = AL.getArgAsIdent(0);
     StringRef Param = Ident->Ident->getName();
     if (!TestTypestateAttr::ConvertStrToConsumedState(Param, TestState)) {
       S.Diag(Ident->Loc, diag::warn_attribute_type_not_supported) << AL
                                                                   << Param;
       return;
     }
   } else {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_type)
         << AL << AANT_ArgumentIdentifier;
     return;
   }
 
-  D->addAttr(::new (S.Context)
-             TestTypestateAttr(AL.getRange(), S.Context, TestState,
-                                AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) TestTypestateAttr(S.Context, AL, TestState));
 }
 
 static void handleExtVectorTypeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // Remember this typedef decl, we will need it later for diagnostics.
   S.ExtVectorDecls.push_back(cast<TypedefNameDecl>(D));
 }
 
 static void handlePackedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (auto *TD = dyn_cast<TagDecl>(D))
-    TD->addAttr(::new (S.Context) PackedAttr(AL.getRange(), S.Context,
-                                        AL.getAttributeSpellingListIndex()));
+    TD->addAttr(::new (S.Context) PackedAttr(S.Context, AL));
   else if (auto *FD = dyn_cast<FieldDecl>(D)) {
     bool BitfieldByteAligned = (!FD->getType()->isDependentType() &&
                                 !FD->getType()->isIncompleteType() &&
                                 FD->isBitField() &&
                                 S.Context.getTypeAlign(FD->getType()) <= 8);
 
     if (S.getASTContext().getTargetInfo().getTriple().isPS4()) {
       if (BitfieldByteAligned)
         // The PS4 target needs to maintain ABI backwards compatibility.
         S.Diag(AL.getLoc(), diag::warn_attribute_ignored_for_field_of_type)
             << AL << FD->getType();
       else
-        FD->addAttr(::new (S.Context) PackedAttr(
-                    AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
+        FD->addAttr(::new (S.Context) PackedAttr(S.Context, AL));
     } else {
       // Report warning about changed offset in the newer compiler versions.
       if (BitfieldByteAligned)
         S.Diag(AL.getLoc(), diag::warn_attribute_packed_for_bitfield);
 
-      FD->addAttr(::new (S.Context) PackedAttr(
-                  AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
+      FD->addAttr(::new (S.Context) PackedAttr(S.Context, AL));
     }
 
   } else
     S.Diag(AL.getLoc(), diag::warn_attribute_ignored) << AL;
 }
 
 static bool checkIBOutletCommon(Sema &S, Decl *D, const ParsedAttr &AL) {
   // The IBOutlet/IBOutletCollection attributes only apply to instance
static bool checkIBOutletCommon(Sema &S, Decl *D, const ParsedAttr &AL) {
 
   return true;
 }
 
 static void handleIBOutlet(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!checkIBOutletCommon(S, D, AL))
     return;
 
-  D->addAttr(::new (S.Context)
-             IBOutletAttr(AL.getRange(), S.Context,
-                          AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) IBOutletAttr(S.Context, AL));
 }
 
 static void handleIBOutletCollection(Sema &S, Decl *D, const ParsedAttr &AL) {
 
   // The iboutletcollection attribute can have zero or one arguments.
   if (AL.getNumArgs() > 1) {
     S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << AL << 1;
     return;
static void handleIBOutletCollection(Sema &S, Decl *D, const ParsedAttr &AL) {
   // treated as __attribute__((iboutletcollection())).
   if (!QT->isObjCIdType() && !QT->isObjCObjectType()) {
     S.Diag(AL.getLoc(),
            QT->isBuiltinType() ? diag::err_iboutletcollection_builtintype
                                : diag::err_iboutletcollection_type) << QT;
     return;
   }
 
-  D->addAttr(::new (S.Context)
-             IBOutletCollectionAttr(AL.getRange(), S.Context, QTLoc,
-                                    AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) IBOutletCollectionAttr(S.Context, AL, QTLoc));
 }
 
 bool Sema::isValidPointerAttrType(QualType T, bool RefOkay) {
   if (RefOkay) {
     if (T->isReferenceType())
       return true;
   } else {
     T = T.getNonReferenceType();
if (NonNullArgs.empty() && AL.getLoc().isFileID() &&
 
     if (!AnyPointers)
       S.Diag(AL.getLoc(), diag::warn_attribute_nonnull_no_pointers);
   }
 
   ParamIdx *Start = NonNullArgs.data();
   unsigned Size = NonNullArgs.size();
   llvm::array_pod_sort(Start, Start + Size);
-  D->addAttr(::new (S.Context)
-                 NonNullAttr(AL.getRange(), S.Context, Start, Size,
-                             AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) NonNullAttr(S.Context, AL, Start, Size));
 }
 
 static void handleNonNullAttrParameter(Sema &S, ParmVarDecl *D,
                                        const ParsedAttr &AL) {
   if (AL.getNumArgs() > 0) {
     if (D->getFunctionType()) {
       handleNonNullAttr(S, D, AL);
     } else {
       S.Diag(AL.getLoc(), diag::warn_attribute_nonnull_parm_no_args)
         << D->getSourceRange();
     }
     return;
   }
 
   // Is the argument a pointer type?
   if (!attrNonNullArgCheck(S, D->getType(), AL, SourceRange(),
                            D->getSourceRange()))
     return;
 
-  D->addAttr(::new (S.Context)
-                 NonNullAttr(AL.getRange(), S.Context, nullptr, 0,
-                             AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) NonNullAttr(S.Context, AL, nullptr, 0));
 }
 
 static void handleReturnsNonNullAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   QualType ResultType = getFunctionOrMethodResultType(D);
   SourceRange SR = getFunctionOrMethodResultSourceRange(D);
   if (!attrNonNullArgCheck(S, ResultType, AL, SourceRange(), SR,
                            /* isReturnValue */ true))
     return;
 
-  D->addAttr(::new (S.Context)
-            ReturnsNonNullAttr(AL.getRange(), S.Context,
-                               AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ReturnsNonNullAttr(S.Context, AL));
 }
 
 static void handleNoEscapeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (D->isInvalidDecl())
     return;
 
   // noescape only applies to pointer types.
   QualType T = cast<ParmVarDecl>(D)->getType();
   if (!S.isValidPointerAttrType(T, /* RefOkay */ true)) {
     S.Diag(AL.getLoc(), diag::warn_attribute_pointers_only)
         << AL << AL.getRange() << 0;
     return;
   }
 
-  D->addAttr(::new (S.Context) NoEscapeAttr(
-      AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) NoEscapeAttr(S.Context, AL));
 }
 
 static void handleAssumeAlignedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   Expr *E = AL.getArgAsExpr(0),
        *OE = AL.getNumArgs() > 1 ? AL.getArgAsExpr(1) : nullptr;
-  S.AddAssumeAlignedAttr(AL.getRange(), D, E, OE,
-                         AL.getAttributeSpellingListIndex());
+  S.AddAssumeAlignedAttr(D, AL, E, OE);
 }
 
 static void handleAllocAlignAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
-  S.AddAllocAlignAttr(AL.getRange(), D, AL.getArgAsExpr(0),
-                      AL.getAttributeSpellingListIndex());
+  S.AddAllocAlignAttr(D, AL, AL.getArgAsExpr(0));
 }
 
-void Sema::AddAssumeAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
-                                Expr *OE, unsigned SpellingListIndex) {
+void Sema::AddAssumeAlignedAttr(Decl *D, const AttributeCommonInfo &CI, Expr *E,
+                                Expr *OE) {
   QualType ResultType = getFunctionOrMethodResultType(D);
   SourceRange SR = getFunctionOrMethodResultSourceRange(D);
 
-  AssumeAlignedAttr TmpAttr(AttrRange, Context, E, OE, SpellingListIndex);
-  SourceLocation AttrLoc = AttrRange.getBegin();
+  AssumeAlignedAttr TmpAttr(Context, CI, E, OE);
+  SourceLocation AttrLoc = TmpAttr.getLocation();
 
   if (!isValidPointerAttrType(ResultType, /* RefOkay */ true)) {
     Diag(AttrLoc, diag::warn_attribute_return_pointers_refs_only)
-      << &TmpAttr << AttrRange << SR;
+        << &TmpAttr << TmpAttr.getRange() << SR;
     return;
   }
 
   if (!E->isValueDependent()) {
     llvm::APSInt I(64);
     if (!E->isIntegerConstantExpr(I, Context)) {
       if (OE)
         Diag(AttrLoc, diag::err_attribute_argument_n_type)
if (!OE->isValueDependent()) {
         Diag(AttrLoc, diag::err_attribute_argument_n_type)
           << &TmpAttr << 2 << AANT_ArgumentIntegerConstant
           << OE->getSourceRange();
         return;
       }
     }
   }
 
-  D->addAttr(::new (Context)
-            AssumeAlignedAttr(AttrRange, Context, E, OE, SpellingListIndex));
+  D->addAttr(::new (Context) AssumeAlignedAttr(Context, CI, E, OE));
 }
 
-void Sema::AddAllocAlignAttr(SourceRange AttrRange, Decl *D, Expr *ParamExpr,
-                             unsigned SpellingListIndex) {
+void Sema::AddAllocAlignAttr(Decl *D, const AttributeCommonInfo &CI,
+                             Expr *ParamExpr) {
   QualType ResultType = getFunctionOrMethodResultType(D);
 
-  AllocAlignAttr TmpAttr(AttrRange, Context, ParamIdx(), SpellingListIndex);
-  SourceLocation AttrLoc = AttrRange.getBegin();
+  AllocAlignAttr TmpAttr(Context, CI, ParamIdx());
+  SourceLocation AttrLoc = CI.getLoc();
 
   if (!ResultType->isDependentType() &&
       !isValidPointerAttrType(ResultType, /* RefOkay */ true)) {
     Diag(AttrLoc, diag::warn_attribute_return_pointers_refs_only)
-        << &TmpAttr << AttrRange << getFunctionOrMethodResultSourceRange(D);
+        << &TmpAttr << CI.getRange() << getFunctionOrMethodResultSourceRange(D);
     return;
   }
 
   ParamIdx Idx;
   const auto *FuncDecl = cast<FunctionDecl>(D);
   if (!checkFunctionOrMethodParameterIndex(*this, FuncDecl, TmpAttr,
                                            /*AttrArgNum=*/1, ParamExpr, Idx))
     return;
 
   QualType Ty = getFunctionOrMethodParamType(D, Idx.getASTIndex());
   if (!Ty->isDependentType() && !Ty->isIntegralType(Context)) {
     Diag(ParamExpr->getBeginLoc(), diag::err_attribute_integers_only)
         << &TmpAttr
         << FuncDecl->getParamDecl(Idx.getASTIndex())->getSourceRange();
     return;
   }
 
-  D->addAttr(::new (Context)
-                 AllocAlignAttr(AttrRange, Context, Idx, SpellingListIndex));
+  D->addAttr(::new (Context) AllocAlignAttr(Context, CI, Idx));
 }
 
 /// Normalize the attribute, __foo__ becomes foo.
 /// Returns true if normalization was applied.
 static bool normalizeName(StringRef &AttrName) {
   if (AttrName.size() > 4 && AttrName.startswith("__") &&
       AttrName.endswith("__")) {
     AttrName = AttrName.drop_front(2).drop_back(2);
static void handleOwnershipAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!AL.isArgIdent(0)) {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
         << AL << 1 << AANT_ArgumentIdentifier;
     return;
   }
 
   // Figure out our Kind.
   OwnershipAttr::OwnershipKind K =
-      OwnershipAttr(AL.getLoc(), S.Context, nullptr, nullptr, 0,
-                    AL.getAttributeSpellingListIndex()).getOwnKind();
+      OwnershipAttr(S.Context, AL, nullptr, nullptr, 0).getOwnKind();
 
   // Check arguments.
   switch (K) {
   case OwnershipAttr::Takes:
   case OwnershipAttr::Holds:
     if (AL.getNumArgs() < 2) {
       S.Diag(AL.getLoc(), diag::err_attribute_too_few_arguments) << AL << 2;
       return;
for (unsigned i = 1; i < AL.getNumArgs(); ++i) {
     }
     OwnershipArgs.push_back(Idx);
   }
 
   ParamIdx *Start = OwnershipArgs.data();
   unsigned Size = OwnershipArgs.size();
   llvm::array_pod_sort(Start, Start + Size);
   D->addAttr(::new (S.Context)
-                 OwnershipAttr(AL.getLoc(), S.Context, Module, Start, Size,
-                               AL.getAttributeSpellingListIndex()));
+                 OwnershipAttr(S.Context, AL, Module, Start, Size));
 }
 
 static void handleWeakRefAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // Check the attribute arguments.
   if (AL.getNumArgs() > 1) {
     S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << AL << 1;
     return;
   }
static void handleWeakRefAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
 
   // FIXME: it would be good for us to keep the WeakRefAttr as-written instead
   // of transforming it into an AliasAttr.  The WeakRefAttr never uses the
   // StringRef parameter it was given anyway.
   StringRef Str;
   if (AL.getNumArgs() && S.checkStringLiteralArgumentAttr(AL, 0, Str))
     // GCC will accept anything as the argument of weakref. Should we
     // check for an existing decl?
-    D->addAttr(::new (S.Context) AliasAttr(AL.getRange(), S.Context, Str,
-                                        AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) AliasAttr(S.Context, AL, Str));
 
-  D->addAttr(::new (S.Context)
-             WeakRefAttr(AL.getRange(), S.Context,
-                         AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) WeakRefAttr(S.Context, AL));
 }
 
 static void handleIFuncAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   StringRef Str;
   if (!S.checkStringLiteralArgumentAttr(AL, 0, Str))
     return;
 
   // Aliases should be on declarations, not definitions.
   const auto *FD = cast<FunctionDecl>(D);
   if (FD->isThisDeclarationADefinition()) {
     S.Diag(AL.getLoc(), diag::err_alias_is_definition) << FD << 1;
     return;
   }
 
-  D->addAttr(::new (S.Context) IFuncAttr(AL.getRange(), S.Context, Str,
-                                         AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) IFuncAttr(S.Context, AL, Str));
 }
 
 static void handleAliasAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   StringRef Str;
   if (!S.checkStringLiteralArgumentAttr(AL, 0, Str))
     return;
 
   if (S.Context.getTargetInfo().getTriple().isOSDarwin()) {
if (!S.LangOpts.CPlusPlus) {
     // linkage name, not the pre-mangled identifier.
     const DeclarationNameInfo target(&S.Context.Idents.get(Str), AL.getLoc());
     LookupResult LR(S, target, Sema::LookupOrdinaryName);
     if (S.LookupQualifiedName(LR, S.getCurLexicalContext()))
       for (NamedDecl *ND : LR)
         ND->markUsed(S.Context);
   }
 
-  D->addAttr(::new (S.Context) AliasAttr(AL.getRange(), S.Context, Str,
-                                         AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) AliasAttr(S.Context, AL, Str));
 }
 
 static void handleTLSModelAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   StringRef Model;
   SourceLocation LiteralLoc;
   // Check that it is a string.
   if (!S.checkStringLiteralArgumentAttr(AL, 0, Model, &LiteralLoc))
     return;
 
   // Check that the value.
   if (Model != "global-dynamic" && Model != "local-dynamic"
       && Model != "initial-exec" && Model != "local-exec") {
     S.Diag(LiteralLoc, diag::err_attr_tlsmodel_arg);
     return;
   }
 
-  D->addAttr(::new (S.Context)
-             TLSModelAttr(AL.getRange(), S.Context, Model,
-                          AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) TLSModelAttr(S.Context, AL, Model));
 }
 
 static void handleRestrictAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   QualType ResultType = getFunctionOrMethodResultType(D);
   if (ResultType->isAnyPointerType() || ResultType->isBlockPointerType()) {
-    D->addAttr(::new (S.Context) RestrictAttr(
-        AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) RestrictAttr(S.Context, AL));
     return;
   }
 
   S.Diag(AL.getLoc(), diag::warn_attribute_return_pointers_only)
       << AL << getFunctionOrMethodResultSourceRange(D);
 }
 
 static void handleCPUSpecificAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
if (llvm::any_of(CPUs, [CPUName, &Target](const IdentifierInfo *Cur) {
       S.Diag(AL.getLoc(), diag::warn_multiversion_duplicate_entries);
       return;
     }
     CPUs.push_back(CPUArg->Ident);
   }
 
   FD->setIsMultiVersion(true);
   if (AL.getKind() == ParsedAttr::AT_CPUSpecific)
-    D->addAttr(::new (S.Context) CPUSpecificAttr(
-        AL.getRange(), S.Context, CPUs.data(), CPUs.size(),
-        AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context)
+                   CPUSpecificAttr(S.Context, AL, CPUs.data(), CPUs.size()));
   else
-    D->addAttr(::new (S.Context) CPUDispatchAttr(
-        AL.getRange(), S.Context, CPUs.data(), CPUs.size(),
-        AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context)
+                   CPUDispatchAttr(S.Context, AL, CPUs.data(), CPUs.size()));
 }
 
 static void handleCommonAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (S.LangOpts.CPlusPlus) {
     S.Diag(AL.getLoc(), diag::err_attribute_not_supported_in_lang)
         << AL << AttributeLangSupport::Cpp;
     return;
   }
if (AL.isDeclspecAttribute()) {
     if (Arch != llvm::Triple::x86 &&
         (Arch != llvm::Triple::arm && Arch != llvm::Triple::thumb)) {
       S.Diag(AL.getLoc(), diag::err_attribute_not_supported_on_arch)
           << AL << Triple.getArchName();
       return;
     }
   }
 
-  D->addAttr(::new (S.Context) NakedAttr(AL.getRange(), S.Context,
-                                         AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) NakedAttr(S.Context, AL));
 }
 
 static void handleNoReturnAttr(Sema &S, Decl *D, const ParsedAttr &Attrs) {
   if (hasDeclarator(D)) return;
 
   if (!isa<ObjCMethodDecl>(D)) {
     S.Diag(Attrs.getLoc(), diag::warn_attribute_wrong_decl_type)
         << Attrs << ExpectedFunctionOrMethod;
     return;
   }
 
-  D->addAttr(::new (S.Context) NoReturnAttr(
-      Attrs.getRange(), S.Context, Attrs.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) NoReturnAttr(S.Context, Attrs));
 }
 
 static void handleNoCfCheckAttr(Sema &S, Decl *D, const ParsedAttr &Attrs) {
   if (!S.getLangOpts().CFProtectionBranch)
     S.Diag(Attrs.getLoc(), diag::warn_nocf_check_attribute_ignored);
   else
     handleSimpleAttribute<AnyX86NoCfCheckAttr>(S, D, Attrs);
 }
if (!VD || (!VD->getType()->isBlockPointerType() &&
       S.Diag(AL.getLoc(), AL.isCXX11Attribute()
                               ? diag::err_attribute_wrong_decl_type
                               : diag::warn_attribute_wrong_decl_type)
           << AL << ExpectedFunctionMethodOrBlock;
       return;
     }
   }
 
-  D->addAttr(::new (S.Context)
-             AnalyzerNoReturnAttr(AL.getRange(), S.Context,
-                                  AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) AnalyzerNoReturnAttr(S.Context, AL));
 }
 
 // PS3 PPU-specific.
 static void handleVecReturnAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   /*
     Returning a Vector Class in Registers
 
     According to the PPU ABI specifications, a class with a single member of
static void handleVecReturnAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   for (const auto *I : R->fields()) {
     if ((count == 1) || !I->getType()->isVectorType()) {
       S.Diag(AL.getLoc(), diag::err_attribute_vecreturn_only_vector_member);
       return;
     }
     count++;
   }
 
-  D->addAttr(::new (S.Context) VecReturnAttr(
-      AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) VecReturnAttr(S.Context, AL));
 }
 
 static void handleDependencyAttr(Sema &S, Scope *Scope, Decl *D,
                                  const ParsedAttr &AL) {
   if (isa<ParmVarDecl>(D)) {
     // [[carries_dependency]] can only be applied to a parameter if it is a
     // parameter of a function declaration or lambda.
     if (!(Scope->getFlags() & clang::Scope::FunctionDeclarationScope)) {
       S.Diag(AL.getLoc(),
              diag::err_carries_dependency_param_not_function_decl);
       return;
     }
   }
 
-  D->addAttr(::new (S.Context) CarriesDependencyAttr(
-                                   AL.getRange(), S.Context,
-                                   AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) CarriesDependencyAttr(S.Context, AL));
 }
 
 static void handleUnusedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   bool IsCXX17Attr = AL.isCXX11Attribute() && !AL.getScopeName();
 
   // If this is spelled as the standard C++17 attribute, but not in C++17, warn
   // about using it as an extension.
   if (!S.getLangOpts().CPlusPlus17 && IsCXX17Attr)
     S.Diag(AL.getLoc(), diag::ext_cxx17_attr) << AL;
 
-  D->addAttr(::new (S.Context) UnusedAttr(
-      AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) UnusedAttr(S.Context, AL));
 }
 
 static void handleConstructorAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   uint32_t priority = ConstructorAttr::DefaultPriority;
   if (AL.getNumArgs() &&
       !checkUInt32Argument(S, AL, AL.getArgAsExpr(0), priority))
     return;
 
-  D->addAttr(::new (S.Context)
-             ConstructorAttr(AL.getRange(), S.Context, priority,
-                             AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ConstructorAttr(S.Context, AL, priority));
 }
 
 static void handleDestructorAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   uint32_t priority = DestructorAttr::DefaultPriority;
   if (AL.getNumArgs() &&
       !checkUInt32Argument(S, AL, AL.getArgAsExpr(0), priority))
     return;
 
-  D->addAttr(::new (S.Context)
-             DestructorAttr(AL.getRange(), S.Context, priority,
-                            AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) DestructorAttr(S.Context, AL, priority));
 }
 
 template <typename AttrTy>
 static void handleAttrWithMessage(Sema &S, Decl *D, const ParsedAttr &AL) {
   // Handle the case where the attribute has a text message.
   StringRef Str;
   if (AL.getNumArgs() == 1 && !S.checkStringLiteralArgumentAttr(AL, 0, Str))
     return;
 
-  D->addAttr(::new (S.Context) AttrTy(AL.getRange(), S.Context, Str,
-                                      AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) AttrTy(S.Context, AL, Str));
 }
 
 static void handleObjCSuppresProtocolAttr(Sema &S, Decl *D,
                                           const ParsedAttr &AL) {
   if (!cast<ObjCProtocolDecl>(D)->isThisDeclarationADefinition()) {
     S.Diag(AL.getLoc(), diag::err_objc_attr_protocol_requires_definition)
         << AL << AL.getRange();
     return;
   }
 
-  D->addAttr(::new (S.Context)
-          ObjCExplicitProtocolImplAttr(AL.getRange(), S.Context,
-                                       AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ObjCExplicitProtocolImplAttr(S.Context, AL));
 }
 
 static bool checkAvailabilityAttr(Sema &S, SourceRange Range,
                                   IdentifierInfo *Platform,
                                   VersionTuple Introduced,
                                   VersionTuple Deprecated,
                                   VersionTuple Obsoleted) {
   StringRef PlatformName
static bool versionsMatch(const VersionTuple &X, const VersionTuple &Y,
 
   if (BeforeIsOkay && X < Y)
     return true;
 
   return false;
 }
 
 AvailabilityAttr *Sema::mergeAvailabilityAttr(
-    NamedDecl *D, SourceRange Range, IdentifierInfo *Platform, bool Implicit,
-    VersionTuple Introduced, VersionTuple Deprecated, VersionTuple Obsoleted,
-    bool IsUnavailable, StringRef Message, bool IsStrict, StringRef Replacement,
-    AvailabilityMergeKind AMK, int Priority, unsigned AttrSpellingListIndex) {
+    NamedDecl *D, const AttributeCommonInfo &CI, IdentifierInfo *Platform,
+    bool Implicit, VersionTuple Introduced, VersionTuple Deprecated,
+    VersionTuple Obsoleted, bool IsUnavailable, StringRef Message,
+    bool IsStrict, StringRef Replacement, AvailabilityMergeKind AMK,
+    int Priority) {
   VersionTuple MergedIntroduced = Introduced;
   VersionTuple MergedDeprecated = Deprecated;
   VersionTuple MergedObsoleted = Obsoleted;
   bool FoundAny = false;
   bool OverrideOrImpl = false;
   switch (AMK) {
   case AMK_None:
   case AMK_Redeclaration:
for (unsigned i = 0, e = Attrs.size(); i != e;) {
             Diag(OldAA->getLocation(),
                  diag::warn_mismatched_availability_override)
               << Which
               << AvailabilityAttr::getPrettyPlatformName(Platform->getName())
               << FirstVersion.getAsString() << SecondVersion.getAsString()
               << (AMK == AMK_Override);
           }
           if (AMK == AMK_Override)
-            Diag(Range.getBegin(), diag::note_overridden_method);
+            Diag(CI.getLoc(), diag::note_overridden_method);
           else
-            Diag(Range.getBegin(), diag::note_protocol_method);
+            Diag(CI.getLoc(), diag::note_protocol_method);
         } else {
           Diag(OldAA->getLocation(), diag::warn_mismatched_availability);
-          Diag(Range.getBegin(), diag::note_previous_attribute);
+          Diag(CI.getLoc(), diag::note_previous_attribute);
         }
 
         Attrs.erase(Attrs.begin() + i);
         --e;
         continue;
       }
 
       VersionTuple MergedIntroduced2 = MergedIntroduced;
AvailabilityAttr *Sema::mergeAvailabilityAttr(
   if (FoundAny &&
       MergedIntroduced == Introduced &&
       MergedDeprecated == Deprecated &&
       MergedObsoleted == Obsoleted)
     return nullptr;
 
   // Only create a new attribute if !OverrideOrImpl, but we want to do
   // the checking.
-  if (!checkAvailabilityAttr(*this, Range, Platform, MergedIntroduced,
+  if (!checkAvailabilityAttr(*this, CI.getRange(), Platform, MergedIntroduced,
                              MergedDeprecated, MergedObsoleted) &&
       !OverrideOrImpl) {
-    auto *Avail = ::new (Context)
-        AvailabilityAttr(Range, Context, Platform, Introduced, Deprecated,
-                         Obsoleted, IsUnavailable, Message, IsStrict,
-                         Replacement, Priority, AttrSpellingListIndex);
+    auto *Avail = ::new (Context) AvailabilityAttr(
+        Context, CI, Platform, Introduced, Deprecated, Obsoleted, IsUnavailable,
+        Message, IsStrict, Replacement, Priority);
     Avail->setImplicit(Implicit);
     return Avail;
   }
   return nullptr;
 }
 
 static void handleAvailabilityAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!checkAttributeNumArgs(S, AL, 1))
     return;
   IdentifierLoc *Platform = AL.getArgAsIdent(0);
-  unsigned Index = AL.getAttributeSpellingListIndex();
 
   IdentifierInfo *II = Platform->Ident;
   if (AvailabilityAttr::getPrettyPlatformName(II->getName()).empty())
     S.Diag(Platform->Loc, diag::warn_availability_unknown_platform)
       << Platform->Ident;
 
   auto *ND = dyn_cast<NamedDecl>(D);
   if (!ND) // We warned about this already, so just return.
if (Introduced.isValid() || Obsoleted.isValid() ||
       return;
     }
   }
 
   int PriorityModifier = AL.isPragmaClangAttribute()
                              ? Sema::AP_PragmaClangAttribute
                              : Sema::AP_Explicit;
   AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(
-      ND, AL.getRange(), II, false /*Implicit*/, Introduced.Version,
-      Deprecated.Version, Obsoleted.Version, IsUnavailable, Str, IsStrict,
-      Replacement, Sema::AMK_None, PriorityModifier, Index);
+      ND, AL, II, false /*Implicit*/, Introduced.Version, Deprecated.Version,
+      Obsoleted.Version, IsUnavailable, Str, IsStrict, Replacement,
+      Sema::AMK_None, PriorityModifier);
   if (NewAttr)
     D->addAttr(NewAttr);
 
   // Transcribe "ios" to "watchos" (and add a new attribute) if the versioning
   // matches before the start of the watchOS platform.
   if (S.Context.getTargetInfo().getTriple().isWatchOS()) {
     IdentifierInfo *NewII = nullptr;
     if (II->getName() == "ios")
if (NewII) {
           return VersionTuple(2, 0);
         };
 
         auto NewIntroduced = adjustWatchOSVersion(Introduced.Version);
         auto NewDeprecated = adjustWatchOSVersion(Deprecated.Version);
         auto NewObsoleted = adjustWatchOSVersion(Obsoleted.Version);
 
         AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(
-            ND, AL.getRange(), NewII, true /*Implicit*/, NewIntroduced,
-            NewDeprecated, NewObsoleted, IsUnavailable, Str, IsStrict,
-            Replacement, Sema::AMK_None,
-            PriorityModifier + Sema::AP_InferredFromOtherPlatform, Index);
+            ND, AL, NewII, true /*Implicit*/, NewIntroduced, NewDeprecated,
+            NewObsoleted, IsUnavailable, Str, IsStrict, Replacement,
+            Sema::AMK_None,
+            PriorityModifier + Sema::AP_InferredFromOtherPlatform);
         if (NewAttr)
           D->addAttr(NewAttr);
       }
   } else if (S.Context.getTargetInfo().getTriple().isTvOS()) {
     // Transcribe "ios" to "tvos" (and add a new attribute) if the versioning
     // matches before the start of the tvOS platform.
     IdentifierInfo *NewII = nullptr;
     if (II->getName() == "ios")
       NewII = &S.Context.Idents.get("tvos");
     else if (II->getName() == "ios_app_extension")
       NewII = &S.Context.Idents.get("tvos_app_extension");
 
     if (NewII) {
       AvailabilityAttr *NewAttr = S.mergeAvailabilityAttr(
-          ND, AL.getRange(), NewII, true /*Implicit*/, Introduced.Version,
+          ND, AL, NewII, true /*Implicit*/, Introduced.Version,
           Deprecated.Version, Obsoleted.Version, IsUnavailable, Str, IsStrict,
           Replacement, Sema::AMK_None,
-          PriorityModifier + Sema::AP_InferredFromOtherPlatform, Index);
+          PriorityModifier + Sema::AP_InferredFromOtherPlatform);
       if (NewAttr)
         D->addAttr(NewAttr);
       }
   }
 }
 
 static void handleExternalSourceSymbolAttr(Sema &S, Decl *D,
                                            const ParsedAttr &AL) {
   if (!checkAttributeAtLeastNumArgs(S, AL, 1))
     return;
   assert(checkAttributeAtMostNumArgs(S, AL, 3) &&
          "Invalid number of arguments in an external_source_symbol attribute");
 
   StringRef Language;
   if (const auto *SE = dyn_cast_or_null<StringLiteral>(AL.getArgAsExpr(0)))
     Language = SE->getString();
   StringRef DefinedIn;
   if (const auto *SE = dyn_cast_or_null<StringLiteral>(AL.getArgAsExpr(1)))
     DefinedIn = SE->getString();
   bool IsGeneratedDeclaration = AL.getArgAsIdent(2) != nullptr;
 
   D->addAttr(::new (S.Context) ExternalSourceSymbolAttr(
-      AL.getRange(), S.Context, Language, DefinedIn, IsGeneratedDeclaration,
-      AL.getAttributeSpellingListIndex()));
+      S.Context, AL, Language, DefinedIn, IsGeneratedDeclaration));
 }
 
 template <class T>
-static T *mergeVisibilityAttr(Sema &S, Decl *D, SourceRange range,
-                              typename T::VisibilityType value,
-                              unsigned attrSpellingListIndex) {
+static T *mergeVisibilityAttr(Sema &S, Decl *D, const AttributeCommonInfo &CI,
+                              typename T::VisibilityType value) {
   T *existingAttr = D->getAttr<T>();
   if (existingAttr) {
     typename T::VisibilityType existingValue = existingAttr->getVisibility();
     if (existingValue == value)
       return nullptr;
     S.Diag(existingAttr->getLocation(), diag::err_mismatched_visibility);
-    S.Diag(range.getBegin(), diag::note_previous_attribute);
+    S.Diag(CI.getLoc(), diag::note_previous_attribute);
     D->dropAttr<T>();
   }
-  return ::new (S.Context) T(range, S.Context, value, attrSpellingListIndex);
+  return ::new (S.Context) T(S.Context, CI, value);
 }
 
-VisibilityAttr *Sema::mergeVisibilityAttr(Decl *D, SourceRange Range,
-                                          VisibilityAttr::VisibilityType Vis,
-                                          unsigned AttrSpellingListIndex) {
-  return ::mergeVisibilityAttr<VisibilityAttr>(*this, D, Range, Vis,
-                                               AttrSpellingListIndex);
+VisibilityAttr *Sema::mergeVisibilityAttr(Decl *D,
+                                          const AttributeCommonInfo &CI,
+                                          VisibilityAttr::VisibilityType Vis) {
+  return ::mergeVisibilityAttr<VisibilityAttr>(*this, D, CI, Vis);
 }
 
-TypeVisibilityAttr *Sema::mergeTypeVisibilityAttr(Decl *D, SourceRange Range,
-                                      TypeVisibilityAttr::VisibilityType Vis,
-                                      unsigned AttrSpellingListIndex) {
-  return ::mergeVisibilityAttr<TypeVisibilityAttr>(*this, D, Range, Vis,
-                                                   AttrSpellingListIndex);
+TypeVisibilityAttr *
+Sema::mergeTypeVisibilityAttr(Decl *D, const AttributeCommonInfo &CI,
+                              TypeVisibilityAttr::VisibilityType Vis) {
+  return ::mergeVisibilityAttr<TypeVisibilityAttr>(*this, D, CI, Vis);
 }
 
 static void handleVisibilityAttr(Sema &S, Decl *D, const ParsedAttr &AL,
                                  bool isTypeVisibility) {
   // Visibility attributes don't mean anything on a typedef.
   if (isa<TypedefNameDecl>(D)) {
     S.Diag(AL.getRange().getBegin(), diag::warn_attribute_ignored) << AL;
     return;
static void handleVisibilityAttr(Sema &S, Decl *D, const ParsedAttr &AL,
   // Complain about attempts to use protected visibility on targets
   // (like Darwin) that don't support it.
   if (type == VisibilityAttr::Protected &&
       !S.Context.getTargetInfo().hasProtectedVisibility()) {
     S.Diag(AL.getLoc(), diag::warn_attribute_protected_visibility);
     type = VisibilityAttr::Default;
   }
 
-  unsigned Index = AL.getAttributeSpellingListIndex();
   Attr *newAttr;
   if (isTypeVisibility) {
-    newAttr = S.mergeTypeVisibilityAttr(D, AL.getRange(),
-                                    (TypeVisibilityAttr::VisibilityType) type,
-                                        Index);
+    newAttr = S.mergeTypeVisibilityAttr(
+        D, AL, (TypeVisibilityAttr::VisibilityType)type);
   } else {
-    newAttr = S.mergeVisibilityAttr(D, AL.getRange(), type, Index);
+    newAttr = S.mergeVisibilityAttr(D, AL, type);
   }
   if (newAttr)
     D->addAttr(newAttr);
 }
 
 static void handleObjCMethodFamilyAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   const auto *M = cast<ObjCMethodDecl>(D);
   if (!AL.isArgIdent(0)) {
static void handleObjCMethodFamilyAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (F == ObjCMethodFamilyAttr::OMF_init &&
       !M->getReturnType()->isObjCObjectPointerType()) {
     S.Diag(M->getLocation(), diag::err_init_method_bad_return_type)
         << M->getReturnType();
     // Ignore the attribute.
     return;
   }
 
-  D->addAttr(new (S.Context) ObjCMethodFamilyAttr(
-      AL.getRange(), S.Context, F, AL.getAttributeSpellingListIndex()));
+  D->addAttr(new (S.Context) ObjCMethodFamilyAttr(S.Context, AL, F));
 }
 
 static void handleObjCNSObject(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (const auto *TD = dyn_cast<TypedefNameDecl>(D)) {
     QualType T = TD->getUnderlyingType();
     if (!T->isCARCBridgableType()) {
       S.Diag(TD->getLocation(), diag::err_nsobject_attribute);
       return;
else {
     // It is okay to include this attribute on properties, e.g.:
     //
     //  @property (retain, nonatomic) struct Bork *Q __attribute__((NSObject));
     //
     // In this case it follows tradition and suppresses an error in the above
     // case.
     S.Diag(D->getLocation(), diag::warn_nsobject_attribute);
   }
-  D->addAttr(::new (S.Context)
-             ObjCNSObjectAttr(AL.getRange(), S.Context,
-                              AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ObjCNSObjectAttr(S.Context, AL));
 }
 
 static void handleObjCIndependentClass(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (const auto *TD = dyn_cast<TypedefNameDecl>(D)) {
     QualType T = TD->getUnderlyingType();
     if (!T->isObjCObjectPointerType()) {
       S.Diag(TD->getLocation(), diag::warn_ptr_independentclass_attribute);
       return;
     }
   } else {
     S.Diag(D->getLocation(), diag::warn_independentclass_attribute);
     return;
   }
-  D->addAttr(::new (S.Context)
-             ObjCIndependentClassAttr(AL.getRange(), S.Context,
-                              AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ObjCIndependentClassAttr(S.Context, AL));
 }
 
 static void handleBlocksAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!AL.isArgIdent(0)) {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
         << AL << 1 << AANT_ArgumentIdentifier;
     return;
   }
 
   IdentifierInfo *II = AL.getArgAsIdent(0)->Ident;
   BlocksAttr::BlockType type;
   if (!BlocksAttr::ConvertStrToBlockType(II->getName(), type)) {
     S.Diag(AL.getLoc(), diag::warn_attribute_type_not_supported) << AL << II;
     return;
   }
 
-  D->addAttr(::new (S.Context)
-             BlocksAttr(AL.getRange(), S.Context, type,
-                        AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) BlocksAttr(S.Context, AL, type));
 }
 
 static void handleSentinelAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   unsigned sentinel = (unsigned)SentinelAttr::DefaultSentinel;
   if (AL.getNumArgs() > 0) {
     Expr *E = AL.getArgAsExpr(0);
     llvm::APSInt Idx(32);
     if (E->isTypeDependent() || E->isValueDependent() ||
if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) {
           << AL << ExpectedFunctionMethodOrBlock;
       return;
     }
   } else {
     S.Diag(AL.getLoc(), diag::warn_attribute_wrong_decl_type)
         << AL << ExpectedFunctionMethodOrBlock;
     return;
   }
-  D->addAttr(::new (S.Context)
-             SentinelAttr(AL.getRange(), S.Context, sentinel, nullPos,
-                          AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) SentinelAttr(S.Context, AL, sentinel, nullPos));
 }
 
 static void handleWarnUnusedResult(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (D->getFunctionType() &&
       D->getFunctionType()->getReturnType()->isVoidType() &&
       !isa<CXXConstructorDecl>(D)) {
     S.Diag(AL.getLoc(), diag::warn_attribute_void_function_method) << AL << 0;
     return;
if (AL.getNumArgs() == 1) {
       // extension.
       // FIXME: C2x should support this feature as well, even as an extension.
       if (!S.checkStringLiteralArgumentAttr(AL, 0, Str, nullptr))
         return;
     } else if (LO.CPlusPlus && !LO.CPlusPlus17)
       S.Diag(AL.getLoc(), diag::ext_cxx17_attr) << AL;
   }
 
-  D->addAttr(::new (S.Context)
-             WarnUnusedResultAttr(AL.getRange(), S.Context, Str,
-                                  AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) WarnUnusedResultAttr(S.Context, AL, Str));
 }
 
 static void handleWeakImportAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // weak_import only applies to variable & function declarations.
   bool isDef = false;
   if (!D->canBeWeakImported(isDef)) {
     if (isDef)
       S.Diag(AL.getLoc(), diag::warn_attribute_invalid_on_definition)
         << "weak_import";
     else if (isa<ObjCPropertyDecl>(D) || isa<ObjCMethodDecl>(D) ||
              (S.Context.getTargetInfo().getTriple().isOSDarwin() &&
               (isa<ObjCInterfaceDecl>(D) || isa<EnumDecl>(D)))) {
       // Nothing to warn about here.
     } else
       S.Diag(AL.getLoc(), diag::warn_attribute_wrong_decl_type)
           << AL << ExpectedVariableOrFunction;
 
     return;
   }
 
-  D->addAttr(::new (S.Context)
-             WeakImportAttr(AL.getRange(), S.Context,
-                            AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) WeakImportAttr(S.Context, AL));
 }
 
 // Handles reqd_work_group_size and work_group_size_hint.
 template <typename WorkGroupAttr>
 static void handleWorkGroupSize(Sema &S, Decl *D, const ParsedAttr &AL) {
   uint32_t WGSize[3];
   for (unsigned i = 0; i < 3; ++i) {
     const Expr *E = AL.getArgAsExpr(i);
     if (!checkUInt32Argument(S, AL, E, WGSize[i], i,
                              /*StrictlyUnsigned=*/true))
       return;
     if (WGSize[i] == 0) {
       S.Diag(AL.getLoc(), diag::err_attribute_argument_is_zero)
           << AL << E->getSourceRange();
       return;
     }
   }
 
   WorkGroupAttr *Existing = D->getAttr<WorkGroupAttr>();
   if (Existing && !(Existing->getXDim() == WGSize[0] &&
                     Existing->getYDim() == WGSize[1] &&
                     Existing->getZDim() == WGSize[2]))
     S.Diag(AL.getLoc(), diag::warn_duplicate_attribute) << AL;
 
-  D->addAttr(::new (S.Context) WorkGroupAttr(AL.getRange(), S.Context,
-                                             WGSize[0], WGSize[1], WGSize[2],
-                                       AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context)
+                 WorkGroupAttr(S.Context, AL, WGSize[0], WGSize[1], WGSize[2]));
 }
 
 // Handles intel_reqd_sub_group_size.
 static void handleSubGroupSize(Sema &S, Decl *D, const ParsedAttr &AL) {
   uint32_t SGSize;
   const Expr *E = AL.getArgAsExpr(0);
   if (!checkUInt32Argument(S, AL, E, SGSize))
     return;
   if (SGSize == 0) {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_is_zero)
         << AL << E->getSourceRange();
     return;
   }
 
   OpenCLIntelReqdSubGroupSizeAttr *Existing =
       D->getAttr<OpenCLIntelReqdSubGroupSizeAttr>();
   if (Existing && Existing->getSubGroupSize() != SGSize)
     S.Diag(AL.getLoc(), diag::warn_duplicate_attribute) << AL;
 
-  D->addAttr(::new (S.Context) OpenCLIntelReqdSubGroupSizeAttr(
-      AL.getRange(), S.Context, SGSize,
-      AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context)
+                 OpenCLIntelReqdSubGroupSizeAttr(S.Context, AL, SGSize));
 }
 
 static void handleVecTypeHint(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!AL.hasParsedType()) {
     S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << AL << 1;
     return;
   }
 
static void handleVecTypeHint(Sema &S, Decl *D, const ParsedAttr &AL) {
 
   if (VecTypeHintAttr *A = D->getAttr<VecTypeHintAttr>()) {
     if (!S.Context.hasSameType(A->getTypeHint(), ParmType)) {
       S.Diag(AL.getLoc(), diag::warn_duplicate_attribute) << AL;
       return;
     }
   }
 
-  D->addAttr(::new (S.Context) VecTypeHintAttr(AL.getLoc(), S.Context,
-                                               ParmTSI,
-                                        AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) VecTypeHintAttr(S.Context, AL, ParmTSI));
 }
 
-SectionAttr *Sema::mergeSectionAttr(Decl *D, SourceRange Range,
-                                    StringRef Name,
-                                    unsigned AttrSpellingListIndex) {
+SectionAttr *Sema::mergeSectionAttr(Decl *D, const AttributeCommonInfo &CI,
+                                    StringRef Name) {
   // Explicit or partial specializations do not inherit
   // the section attribute from the primary template.
   if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
-    if (AttrSpellingListIndex == SectionAttr::Declspec_allocate &&
+    if (CI.getAttributeSpellingListIndex() == SectionAttr::Declspec_allocate &&
         FD->isFunctionTemplateSpecialization())
       return nullptr;
   }
   if (SectionAttr *ExistingAttr = D->getAttr<SectionAttr>()) {
     if (ExistingAttr->getName() == Name)
       return nullptr;
     Diag(ExistingAttr->getLocation(), diag::warn_mismatched_section)
          << 1 /*section*/;
-    Diag(Range.getBegin(), diag::note_previous_attribute);
+    Diag(CI.getLoc(), diag::note_previous_attribute);
     return nullptr;
   }
-  return ::new (Context) SectionAttr(Range, Context, Name,
-                                     AttrSpellingListIndex);
+  return ::new (Context) SectionAttr(Context, CI, Name);
 }
 
 bool Sema::checkSectionName(SourceLocation LiteralLoc, StringRef SecName) {
   std::string Error = Context.getTargetInfo().isValidSectionSpecifier(SecName);
   if (!Error.empty()) {
     Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target) << Error
          << 1 /*'section'*/;
     return false;
static void handleSectionAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // If the target wants to validate the section specifier, make it happen.
   std::string Error = S.Context.getTargetInfo().isValidSectionSpecifier(Str);
   if (!Error.empty()) {
     S.Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target)
     << Error;
     return;
   }
 
-  unsigned Index = AL.getAttributeSpellingListIndex();
-  SectionAttr *NewAttr = S.mergeSectionAttr(D, AL.getRange(), Str, Index);
+  SectionAttr *NewAttr = S.mergeSectionAttr(D, AL, Str);
   if (NewAttr)
     D->addAttr(NewAttr);
 }
 
 // This is used for `__declspec(code_seg("segname"))` on a decl.
 // `#pragma code_seg("segname")` uses checkSectionName() instead.
 static bool checkCodeSegName(Sema &S, SourceLocation LiteralLoc,
                              StringRef CodeSegName) {
   std::string Error =
       S.Context.getTargetInfo().isValidSectionSpecifier(CodeSegName);
   if (!Error.empty()) {
     S.Diag(LiteralLoc, diag::err_attribute_section_invalid_for_target)
         << Error << 0 /*'code-seg'*/;
     return false;
   }
 
   return true;
 }
 
-CodeSegAttr *Sema::mergeCodeSegAttr(Decl *D, SourceRange Range,
-                                    StringRef Name,
-                                    unsigned AttrSpellingListIndex) {
+CodeSegAttr *Sema::mergeCodeSegAttr(Decl *D, const AttributeCommonInfo &CI,
+                                    StringRef Name) {
   // Explicit or partial specializations do not inherit
   // the code_seg attribute from the primary template.
   if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
     if (FD->isFunctionTemplateSpecialization())
       return nullptr;
   }
   if (const auto *ExistingAttr = D->getAttr<CodeSegAttr>()) {
     if (ExistingAttr->getName() == Name)
       return nullptr;
     Diag(ExistingAttr->getLocation(), diag::warn_mismatched_section)
          << 0 /*codeseg*/;
-    Diag(Range.getBegin(), diag::note_previous_attribute);
+    Diag(CI.getLoc(), diag::note_previous_attribute);
     return nullptr;
   }
-  return ::new (Context) CodeSegAttr(Range, Context, Name,
-                                     AttrSpellingListIndex);
+  return ::new (Context) CodeSegAttr(Context, CI, Name);
 }
 
 static void handleCodeSegAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   StringRef Str;
   SourceLocation LiteralLoc;
   if (!S.checkStringLiteralArgumentAttr(AL, 0, Str, &LiteralLoc))
     return;
   if (!checkCodeSegName(S, LiteralLoc, Str))
     return;
   if (const auto *ExistingAttr = D->getAttr<CodeSegAttr>()) {
     if (!ExistingAttr->isImplicit()) {
       S.Diag(AL.getLoc(),
              ExistingAttr->getName() == Str
              ? diag::warn_duplicate_codeseg_attribute
              : diag::err_conflicting_codeseg_attribute);
       return;
     }
     D->dropAttr<CodeSegAttr>();
   }
-  if (CodeSegAttr *CSA = S.mergeCodeSegAttr(D, AL.getRange(), Str,
-                                            AL.getAttributeSpellingListIndex()))
+  if (CodeSegAttr *CSA = S.mergeCodeSegAttr(D, AL, Str))
     D->addAttr(CSA);
 }
 
 // Check for things we'd like to warn about. Multiversioning issues are
 // handled later in the process, once we know how many exist.
 bool Sema::checkTargetAttr(SourceLocation LiteralLoc, StringRef AttrStr) {
   enum FirstParam { Unsupported, Duplicate };
   enum SecondParam { None, Architecture };

 
 static void handleTargetAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   StringRef Str;
   SourceLocation LiteralLoc;
   if (!S.checkStringLiteralArgumentAttr(AL, 0, Str, &LiteralLoc) ||
       S.checkTargetAttr(LiteralLoc, Str))
     return;
 
-  unsigned Index = AL.getAttributeSpellingListIndex();
-  TargetAttr *NewAttr =
-      ::new (S.Context) TargetAttr(AL.getRange(), S.Context, Str, Index);
+  TargetAttr *NewAttr = ::new (S.Context) TargetAttr(S.Context, AL, Str);
   D->addAttr(NewAttr);
 }
 
 static void handleMinVectorWidthAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   Expr *E = AL.getArgAsExpr(0);
   uint32_t VecWidth;
   if (!checkUInt32Argument(S, AL, E, VecWidth)) {
     AL.setInvalid();
     return;
   }
 
   MinVectorWidthAttr *Existing = D->getAttr<MinVectorWidthAttr>();
   if (Existing && Existing->getVectorWidth() != VecWidth) {
     S.Diag(AL.getLoc(), diag::warn_duplicate_attribute) << AL;
     return;
   }
 
-  D->addAttr(::new (S.Context)
-             MinVectorWidthAttr(AL.getRange(), S.Context, VecWidth,
-                                AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) MinVectorWidthAttr(S.Context, AL, VecWidth));
 }
 
 static void handleCleanupAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   Expr *E = AL.getArgAsExpr(0);
   SourceLocation Loc = E->getExprLoc();
   FunctionDecl *FD = nullptr;
   DeclarationNameInfo NI;
 
static void handleCleanupAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   QualType ParamTy = FD->getParamDecl(0)->getType();
   if (S.CheckAssignmentConstraints(FD->getParamDecl(0)->getLocation(),
                                    ParamTy, Ty) != Sema::Compatible) {
     S.Diag(Loc, diag::err_attribute_cleanup_func_arg_incompatible_type)
       << NI.getName() << ParamTy << Ty;
     return;
   }
 
-  D->addAttr(::new (S.Context)
-             CleanupAttr(AL.getRange(), S.Context, FD,
-                         AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) CleanupAttr(S.Context, AL, FD));
 }
 
 static void handleEnumExtensibilityAttr(Sema &S, Decl *D,
                                         const ParsedAttr &AL) {
   if (!AL.isArgIdent(0)) {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
         << AL << 0 << AANT_ArgumentIdentifier;
     return;
   }
 
   EnumExtensibilityAttr::Kind ExtensibilityKind;
   IdentifierInfo *II = AL.getArgAsIdent(0)->Ident;
   if (!EnumExtensibilityAttr::ConvertStrToKind(II->getName(),
                                                ExtensibilityKind)) {
     S.Diag(AL.getLoc(), diag::warn_attribute_type_not_supported) << AL << II;
     return;
   }
 
-  D->addAttr(::new (S.Context) EnumExtensibilityAttr(
-      AL.getRange(), S.Context, ExtensibilityKind,
-      AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context)
+                 EnumExtensibilityAttr(S.Context, AL, ExtensibilityKind));
 }
 
 /// Handle __attribute__((format_arg((idx)))) attribute based on
 /// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
 static void handleFormatArgAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   Expr *IdxExpr = AL.getArgAsExpr(0);
   ParamIdx Idx;
   if (!checkFunctionOrMethodParameterIndex(S, D, AL, 1, IdxExpr, Idx))
if (!isNSStringType(Ty, S.Context) &&
       (!Ty->isPointerType() ||
        !Ty->getAs<PointerType>()->getPointeeType()->isCharType())) {
     S.Diag(AL.getLoc(), diag::err_format_attribute_result_not)
         << (NotNSStringTy ? "string type" : "NSString")
         << IdxExpr->getSourceRange() << getFunctionOrMethodParamRange(D, 0);
     return;
   }
 
-  D->addAttr(::new (S.Context) FormatArgAttr(
-      AL.getRange(), S.Context, Idx, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) FormatArgAttr(S.Context, AL, Idx));
 }
 
 enum FormatAttrKind {
   CFStringFormat,
   NSStringFormat,
   StrftimeFormat,
   SupportedFormat,
   IgnoredFormat,
static void handleInitPriorityAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   }
 
   if (prioritynum < 101 || prioritynum > 65535) {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_out_of_range)
         << E->getSourceRange() << AL << 101 << 65535;
     AL.setInvalid();
     return;
   }
-  D->addAttr(::new (S.Context)
-             InitPriorityAttr(AL.getRange(), S.Context, prioritynum,
-                              AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) InitPriorityAttr(S.Context, AL, prioritynum));
 }
 
-FormatAttr *Sema::mergeFormatAttr(Decl *D, SourceRange Range,
+FormatAttr *Sema::mergeFormatAttr(Decl *D, const AttributeCommonInfo &CI,
                                   IdentifierInfo *Format, int FormatIdx,
-                                  int FirstArg,
-                                  unsigned AttrSpellingListIndex) {
+                                  int FirstArg) {
   // Check whether we already have an equivalent format attribute.
   for (auto *F : D->specific_attrs<FormatAttr>()) {
     if (F->getType() == Format &&
         F->getFormatIdx() == FormatIdx &&
         F->getFirstArg() == FirstArg) {
       // If we don't have a valid location for this attribute, adopt the
       // location.
       if (F->getLocation().isInvalid())
-        F->setRange(Range);
+        F->setRange(CI.getRange());
       return nullptr;
     }
   }
 
-  return ::new (Context) FormatAttr(Range, Context, Format, FormatIdx,
-                                    FirstArg, AttrSpellingListIndex);
+  return ::new (Context) FormatAttr(Context, CI, Format, FormatIdx, FirstArg);
 }
 
 /// Handle __attribute__((format(type,idx,firstarg))) attributes based on
 /// http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
 static void handleFormatAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!AL.isArgIdent(0)) {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
         << AL << 1 << AANT_ArgumentIdentifier;
if (Kind == StrftimeFormat) {
     }
   // if 0 it disables parameter checking (to use with e.g. va_list)
   } else if (FirstArg != 0 && FirstArg != NumArgs) {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_out_of_bounds)
         << AL << 3 << FirstArgExpr->getSourceRange();
     return;
   }
 
-  FormatAttr *NewAttr = S.mergeFormatAttr(D, AL.getRange(), II,
-                                          Idx, FirstArg,
-                                          AL.getAttributeSpellingListIndex());
+  FormatAttr *NewAttr = S.mergeFormatAttr(D, AL, II, Idx, FirstArg);
   if (NewAttr)
     D->addAttr(NewAttr);
 }
 
 /// Handle __attribute__((callback(CalleeIdx, PayloadIdx0, ...))) attributes.
 static void handleCallbackAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // The index that identifies the callback callee is mandatory.
   if (AL.getNumArgs() == 0) {
static void handleCallbackAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
 
   // Do not allow multiple callback attributes.
   if (D->hasAttr<CallbackAttr>()) {
     S.Diag(AL.getLoc(), diag::err_callback_attribute_multiple) << AL.getRange();
     return;
   }
 
   D->addAttr(::new (S.Context) CallbackAttr(
-      AL.getRange(), S.Context, EncodingIndices.data(), EncodingIndices.size(),
-      AL.getAttributeSpellingListIndex()));
+      S.Context, AL, EncodingIndices.data(), EncodingIndices.size()));
 }
 
 static void handleTransparentUnionAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // Try to find the underlying union declaration.
   RecordDecl *RD = nullptr;
   const auto *TD = dyn_cast<TypedefNameDecl>(D);
   if (TD && TD->getUnderlyingType()->isUnionType())
     RD = TD->getUnderlyingType()->getAsUnionType()->getDecl();
if (S.Context.getTypeSize(FieldType) != FirstSize ||
       unsigned FirstBits = isSize? FirstSize : FirstAlign;
       S.Diag(FirstField->getLocation(),
              diag::note_transparent_union_first_field_size_align)
         << isSize << FirstBits;
       return;
     }
   }
 
-  RD->addAttr(::new (S.Context)
-              TransparentUnionAttr(AL.getRange(), S.Context,
-                                   AL.getAttributeSpellingListIndex()));
+  RD->addAttr(::new (S.Context) TransparentUnionAttr(S.Context, AL));
 }
 
 static void handleAnnotateAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // Make sure that there is a string literal as the annotation's single
   // argument.
   StringRef Str;
   if (!S.checkStringLiteralArgumentAttr(AL, 0, Str))
     return;
 
   // Don't duplicate annotations that are already set.
   for (const auto *I : D->specific_attrs<AnnotateAttr>()) {
     if (I->getAnnotation() == Str)
       return;
   }
 
-  D->addAttr(::new (S.Context)
-             AnnotateAttr(AL.getRange(), S.Context, Str,
-                          AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) AnnotateAttr(S.Context, AL, Str));
 }
 
 static void handleAlignValueAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
-  S.AddAlignValueAttr(AL.getRange(), D, AL.getArgAsExpr(0),
-                      AL.getAttributeSpellingListIndex());
+  S.AddAlignValueAttr(D, AL, AL.getArgAsExpr(0));
 }
 
-void Sema::AddAlignValueAttr(SourceRange AttrRange, Decl *D, Expr *E,
-                             unsigned SpellingListIndex) {
-  AlignValueAttr TmpAttr(AttrRange, Context, E, SpellingListIndex);
-  SourceLocation AttrLoc = AttrRange.getBegin();
+void Sema::AddAlignValueAttr(Decl *D, const AttributeCommonInfo &CI, Expr *E) {
+  AlignValueAttr TmpAttr(Context, CI, E);
+  SourceLocation AttrLoc = CI.getLoc();
 
   QualType T;
   if (const auto *TD = dyn_cast<TypedefNameDecl>(D))
     T = TD->getUnderlyingType();
   else if (const auto *VD = dyn_cast<ValueDecl>(D))
     T = VD->getType();
   else
     llvm_unreachable("Unknown decl type for align_value");
if (ICE.isInvalid())
       return;
 
     if (!Alignment.isPowerOf2()) {
       Diag(AttrLoc, diag::err_alignment_not_power_of_two)
         << E->getSourceRange();
       return;
     }
 
-    D->addAttr(::new (Context)
-               AlignValueAttr(AttrRange, Context, ICE.get(),
-               SpellingListIndex));
+    D->addAttr(::new (Context) AlignValueAttr(Context, CI, ICE.get()));
     return;
   }
 
   // Save dependent expressions in the AST to be instantiated.
-  D->addAttr(::new (Context) AlignValueAttr(TmpAttr));
+  D->addAttr(::new (Context) AlignValueAttr(Context, CI, E));
 }
 
 static void handleAlignedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // check the attribute arguments.
   if (AL.getNumArgs() > 1) {
     S.Diag(AL.getLoc(), diag::err_attribute_wrong_number_arguments) << AL << 1;
     return;
   }
 
   if (AL.getNumArgs() == 0) {
-    D->addAttr(::new (S.Context) AlignedAttr(AL.getRange(), S.Context,
-               true, nullptr, AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) AlignedAttr(S.Context, AL, true, nullptr));
     return;
   }
 
   Expr *E = AL.getArgAsExpr(0);
   if (AL.isPackExpansion() && !E->containsUnexpandedParameterPack()) {
     S.Diag(AL.getEllipsisLoc(),
            diag::err_pack_expansion_without_parameter_packs);
     return;
   }
 
   if (!AL.isPackExpansion() && S.DiagnoseUnexpandedParameterPack(E))
     return;
 
-  S.AddAlignedAttr(AL.getRange(), D, E, AL.getAttributeSpellingListIndex(),
-                   AL.isPackExpansion());
+  S.AddAlignedAttr(D, AL, E, AL.isPackExpansion());
 }
 
-void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, Expr *E,
-                          unsigned SpellingListIndex, bool IsPackExpansion) {
-  AlignedAttr TmpAttr(AttrRange, Context, true, E, SpellingListIndex);
-  SourceLocation AttrLoc = AttrRange.getBegin();
+void Sema::AddAlignedAttr(Decl *D, const AttributeCommonInfo &CI, Expr *E,
+                          bool IsPackExpansion) {
+  AlignedAttr TmpAttr(Context, CI, true, E);
+  SourceLocation AttrLoc = CI.getLoc();
 
   // C++11 alignas(...) and C11 _Alignas(...) have additional requirements.
   if (TmpAttr.isAlignas()) {
     // C++11 [dcl.align]p1:
     //   An alignment-specifier may be applied to a variable or to a class
     //   data member, but it shall not be applied to a bit-field, a function
     //   parameter, the formal parameter of a catch clause, or a variable
     //   declared with the register storage class specifier. An
if (const auto *TND = dyn_cast<TypedefNameDecl>(D)) {
       if (!TND->getUnderlyingType()->isDependentType()) {
         Diag(AttrLoc, diag::err_alignment_dependent_typedef_name)
             << E->getSourceRange();
         return;
       }
     }
 
     // Save dependent expressions in the AST to be instantiated.
-    AlignedAttr *AA = ::new (Context) AlignedAttr(TmpAttr);
+    AlignedAttr *AA = ::new (Context) AlignedAttr(Context, CI, true, E);
     AA->setPackExpansion(IsPackExpansion);
     D->addAttr(AA);
     return;
   }
 
   // FIXME: Cache the number on the AL object?
   llvm::APSInt Alignment;
   ExprResult ICE
if (Context.getTargetInfo().isTLSSupported()) {
     if (MaxTLSAlign && AlignVal > MaxTLSAlign && VD &&
         VD->getTLSKind() != VarDecl::TLS_None) {
       Diag(VD->getLocation(), diag::err_tls_var_aligned_over_maximum)
           << (unsigned)AlignVal << VD << MaxTLSAlign;
       return;
     }
   }
 
-  AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, true,
-                                                ICE.get(), SpellingListIndex);
+  AlignedAttr *AA = ::new (Context) AlignedAttr(Context, CI, true, ICE.get());
   AA->setPackExpansion(IsPackExpansion);
   D->addAttr(AA);
 }
 
-void Sema::AddAlignedAttr(SourceRange AttrRange, Decl *D, TypeSourceInfo *TS,
-                          unsigned SpellingListIndex, bool IsPackExpansion) {
+void Sema::AddAlignedAttr(Decl *D, const AttributeCommonInfo &CI,
+                          TypeSourceInfo *TS, bool IsPackExpansion) {
   // FIXME: Cache the number on the AL object if non-dependent?
   // FIXME: Perform checking of type validity
-  AlignedAttr *AA = ::new (Context) AlignedAttr(AttrRange, Context, false, TS,
-                                                SpellingListIndex);
+  AlignedAttr *AA = ::new (Context) AlignedAttr(Context, CI, false, TS);
   AA->setPackExpansion(IsPackExpansion);
   D->addAttr(AA);
 }
 
 void Sema::CheckAlignasUnderalignment(Decl *D) {
   assert(D->hasAttrs() && "no attributes on decl");
 
   QualType UnderlyingTy, DiagTy;
static void handleModeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!AL.isArgIdent(0)) {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_type)
         << AL << AANT_ArgumentIdentifier;
     return;
   }
 
   IdentifierInfo *Name = AL.getArgAsIdent(0)->Ident;
 
-  S.AddModeAttr(AL.getRange(), D, Name, AL.getAttributeSpellingListIndex());
+  S.AddModeAttr(D, AL, Name);
 }
 
-void Sema::AddModeAttr(SourceRange AttrRange, Decl *D, IdentifierInfo *Name,
-                       unsigned SpellingListIndex, bool InInstantiation) {
+void Sema::AddModeAttr(Decl *D, const AttributeCommonInfo &CI,
+                       IdentifierInfo *Name, bool InInstantiation) {
   StringRef Str = Name->getName();
   normalizeName(Str);
-  SourceLocation AttrLoc = AttrRange.getBegin();
+  SourceLocation AttrLoc = CI.getLoc();
 
   unsigned DestWidth = 0;
   bool IntegerMode = true;
   bool ComplexMode = false;
   llvm::APInt VectorSize(64, 0);
   if (Str.size() >= 4 && Str[0] == 'V') {
     // Minimal length of vector mode is 4: 'V' + NUMBER(>=1) + TYPE(>=2).
     size_t StrSize = Str.size();
else if (const auto *ED = dyn_cast<EnumDecl>(D)) {
     // Try to get type from enum declaration, default to int.
     OldTy = ED->getIntegerType();
     if (OldTy.isNull())
       OldTy = Context.IntTy;
   } else
     OldTy = cast<ValueDecl>(D)->getType();
 
   if (OldTy->isDependentType()) {
-    D->addAttr(::new (Context)
-               ModeAttr(AttrRange, Context, Name, SpellingListIndex));
+    D->addAttr(::new (Context) ModeAttr(Context, CI, Name));
     return;
   }
 
   // Base type can also be a vector type (see PR17453).
   // Distinguish between base type and base element type.
   QualType OldElemTy = OldTy;
   if (const auto *VT = OldTy->getAs<VectorType>())
     OldElemTy = VT->getElementType();
 
   // GCC allows 'mode' attribute on enumeration types (even incomplete), except
   // for vector modes. So, 'enum X __attribute__((mode(QI)));' forms a complete
   // type, 'enum { A } __attribute__((mode(V4SI)))' is rejected.
   if ((isa<EnumDecl>(D) || OldElemTy->getAs<EnumType>()) &&
       VectorSize.getBoolValue()) {
-    Diag(AttrLoc, diag::err_enum_mode_vector_type) << Name << AttrRange;
+    Diag(AttrLoc, diag::err_enum_mode_vector_type) << Name << CI.getRange();
     return;
   }
   bool IntegralOrAnyEnumType =
       OldElemTy->isIntegralOrEnumerationType() || OldElemTy->getAs<EnumType>();
 
   if (!OldElemTy->getAs<BuiltinType>() && !OldElemTy->isComplexType() &&
       !IntegralOrAnyEnumType)
     Diag(AttrLoc, diag::err_mode_not_primitive);
void Sema::AddModeAttr(Decl *D, const AttributeCommonInfo &CI,
   // Install the new type.
   if (auto *TD = dyn_cast<TypedefNameDecl>(D))
     TD->setModedTypeSourceInfo(TD->getTypeSourceInfo(), NewTy);
   else if (auto *ED = dyn_cast<EnumDecl>(D))
     ED->setIntegerType(NewTy);
   else
     cast<ValueDecl>(D)->setType(NewTy);
 
-  D->addAttr(::new (Context)
-             ModeAttr(AttrRange, Context, Name, SpellingListIndex));
+  D->addAttr(::new (Context) ModeAttr(Context, CI, Name));
 }
 
 static void handleNoDebugAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
-  D->addAttr(::new (S.Context)
-             NoDebugAttr(AL.getRange(), S.Context,
-                         AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) NoDebugAttr(S.Context, AL));
 }
 
-AlwaysInlineAttr *Sema::mergeAlwaysInlineAttr(Decl *D, SourceRange Range,
-                                              IdentifierInfo *Ident,
-                                              unsigned AttrSpellingListIndex) {
+AlwaysInlineAttr *Sema::mergeAlwaysInlineAttr(Decl *D,
+                                              const AttributeCommonInfo &CI,
+                                              const IdentifierInfo *Ident) {
   if (OptimizeNoneAttr *Optnone = D->getAttr<OptimizeNoneAttr>()) {
-    Diag(Range.getBegin(), diag::warn_attribute_ignored) << Ident;
+    Diag(CI.getLoc(), diag::warn_attribute_ignored) << Ident;
     Diag(Optnone->getLocation(), diag::note_conflicting_attribute);
     return nullptr;
   }
 
   if (D->hasAttr<AlwaysInlineAttr>())
     return nullptr;
 
-  return ::new (Context) AlwaysInlineAttr(Range, Context,
-                                          AttrSpellingListIndex);
+  return ::new (Context) AlwaysInlineAttr(Context, CI);
 }
 
 CommonAttr *Sema::mergeCommonAttr(Decl *D, const ParsedAttr &AL) {
   if (checkAttrMutualExclusion<InternalLinkageAttr>(*this, D, AL))
     return nullptr;
 
-  return ::new (Context)
-      CommonAttr(AL.getRange(), Context, AL.getAttributeSpellingListIndex());
+  return ::new (Context) CommonAttr(Context, AL);
 }
 
 CommonAttr *Sema::mergeCommonAttr(Decl *D, const CommonAttr &AL) {
   if (checkAttrMutualExclusion<InternalLinkageAttr>(*this, D, AL))
     return nullptr;
 
-  return ::new (Context)
-      CommonAttr(AL.getRange(), Context, AL.getSpellingListIndex());
+  return ::new (Context) CommonAttr(Context, AL);
 }
 
 InternalLinkageAttr *Sema::mergeInternalLinkageAttr(Decl *D,
                                                     const ParsedAttr &AL) {
   if (const auto *VD = dyn_cast<VarDecl>(D)) {
     // Attribute applies to Var but not any subclass of it (like ParmVar,
     // ImplicitParm or VarTemplateSpecialization).
     if (VD->getKind() != Decl::Var) {
       Diag(AL.getLoc(), diag::warn_attribute_wrong_decl_type)
           << AL << (getLangOpts().CPlusPlus ? ExpectedFunctionVariableOrClass
                                             : ExpectedVariableOrFunction);
       return nullptr;
     }
     // Attribute does not apply to non-static local variables.
     if (VD->hasLocalStorage()) {
       Diag(VD->getLocation(), diag::warn_internal_linkage_local_storage);
       return nullptr;
     }
   }
 
   if (checkAttrMutualExclusion<CommonAttr>(*this, D, AL))
     return nullptr;
 
-  return ::new (Context) InternalLinkageAttr(
-      AL.getRange(), Context, AL.getAttributeSpellingListIndex());
+  return ::new (Context) InternalLinkageAttr(Context, AL);
 }
 InternalLinkageAttr *
 Sema::mergeInternalLinkageAttr(Decl *D, const InternalLinkageAttr &AL) {
   if (const auto *VD = dyn_cast<VarDecl>(D)) {
     // Attribute applies to Var but not any subclass of it (like ParmVar,
     // ImplicitParm or VarTemplateSpecialization).
     if (VD->getKind() != Decl::Var) {
       Diag(AL.getLocation(), diag::warn_attribute_wrong_decl_type)
           << &AL << (getLangOpts().CPlusPlus ? ExpectedFunctionVariableOrClass
                                              : ExpectedVariableOrFunction);
       return nullptr;
     }
     // Attribute does not apply to non-static local variables.
     if (VD->hasLocalStorage()) {
       Diag(VD->getLocation(), diag::warn_internal_linkage_local_storage);
       return nullptr;
     }
   }
 
   if (checkAttrMutualExclusion<CommonAttr>(*this, D, AL))
     return nullptr;
 
-  return ::new (Context)
-      InternalLinkageAttr(AL.getRange(), Context, AL.getSpellingListIndex());
+  return ::new (Context) InternalLinkageAttr(Context, AL);
 }
 
-MinSizeAttr *Sema::mergeMinSizeAttr(Decl *D, SourceRange Range,
-                                    unsigned AttrSpellingListIndex) {
+MinSizeAttr *Sema::mergeMinSizeAttr(Decl *D, const AttributeCommonInfo &CI) {
   if (OptimizeNoneAttr *Optnone = D->getAttr<OptimizeNoneAttr>()) {
-    Diag(Range.getBegin(), diag::warn_attribute_ignored) << "'minsize'";
+    Diag(CI.getLoc(), diag::warn_attribute_ignored) << "'minsize'";
     Diag(Optnone->getLocation(), diag::note_conflicting_attribute);
     return nullptr;
   }
 
   if (D->hasAttr<MinSizeAttr>())
     return nullptr;
 
-  return ::new (Context) MinSizeAttr(Range, Context, AttrSpellingListIndex);
+  return ::new (Context) MinSizeAttr(Context, CI);
 }
 
 NoSpeculativeLoadHardeningAttr *Sema::mergeNoSpeculativeLoadHardeningAttr(
     Decl *D, const NoSpeculativeLoadHardeningAttr &AL) {
   if (checkAttrMutualExclusion<SpeculativeLoadHardeningAttr>(*this, D, AL))
     return nullptr;
 
-  return ::new (Context) NoSpeculativeLoadHardeningAttr(
-      AL.getRange(), Context, AL.getSpellingListIndex());
+  return ::new (Context) NoSpeculativeLoadHardeningAttr(Context, AL);
 }
 
-OptimizeNoneAttr *Sema::mergeOptimizeNoneAttr(Decl *D, SourceRange Range,
-                                              unsigned AttrSpellingListIndex) {
+OptimizeNoneAttr *Sema::mergeOptimizeNoneAttr(Decl *D,
+                                              const AttributeCommonInfo &CI) {
   if (AlwaysInlineAttr *Inline = D->getAttr<AlwaysInlineAttr>()) {
     Diag(Inline->getLocation(), diag::warn_attribute_ignored) << Inline;
-    Diag(Range.getBegin(), diag::note_conflicting_attribute);
+    Diag(CI.getLoc(), diag::note_conflicting_attribute);
     D->dropAttr<AlwaysInlineAttr>();
   }
   if (MinSizeAttr *MinSize = D->getAttr<MinSizeAttr>()) {
     Diag(MinSize->getLocation(), diag::warn_attribute_ignored) << MinSize;
-    Diag(Range.getBegin(), diag::note_conflicting_attribute);
+    Diag(CI.getLoc(), diag::note_conflicting_attribute);
     D->dropAttr<MinSizeAttr>();
   }
 
   if (D->hasAttr<OptimizeNoneAttr>())
     return nullptr;
 
-  return ::new (Context) OptimizeNoneAttr(Range, Context,
-                                          AttrSpellingListIndex);
+  return ::new (Context) OptimizeNoneAttr(Context, CI);
 }
 
 SpeculativeLoadHardeningAttr *Sema::mergeSpeculativeLoadHardeningAttr(
     Decl *D, const SpeculativeLoadHardeningAttr &AL) {
   if (checkAttrMutualExclusion<NoSpeculativeLoadHardeningAttr>(*this, D, AL))
     return nullptr;
 
-  return ::new (Context) SpeculativeLoadHardeningAttr(
-      AL.getRange(), Context, AL.getSpellingListIndex());
+  return ::new (Context) SpeculativeLoadHardeningAttr(Context, AL);
 }
 
 static void handleAlwaysInlineAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (checkAttrMutualExclusion<NotTailCalledAttr>(S, D, AL))
     return;
 
-  if (AlwaysInlineAttr *Inline = S.mergeAlwaysInlineAttr(
-          D, AL.getRange(), AL.getName(),
-          AL.getAttributeSpellingListIndex()))
+  if (AlwaysInlineAttr *Inline =
+          S.mergeAlwaysInlineAttr(D, AL, AL.getAttrName()))
     D->addAttr(Inline);
 }
 
 static void handleMinSizeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
-  if (MinSizeAttr *MinSize = S.mergeMinSizeAttr(
-          D, AL.getRange(), AL.getAttributeSpellingListIndex()))
+  if (MinSizeAttr *MinSize = S.mergeMinSizeAttr(D, AL))
     D->addAttr(MinSize);
 }
 
 static void handleOptimizeNoneAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
-  if (OptimizeNoneAttr *Optnone = S.mergeOptimizeNoneAttr(
-          D, AL.getRange(), AL.getAttributeSpellingListIndex()))
+  if (OptimizeNoneAttr *Optnone = S.mergeOptimizeNoneAttr(D, AL))
     D->addAttr(Optnone);
 }
 
 static void handleConstantAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (checkAttrMutualExclusion<CUDASharedAttr>(S, D, AL))
     return;
   const auto *VD = cast<VarDecl>(D);
   if (!VD->hasGlobalStorage()) {
     S.Diag(AL.getLoc(), diag::err_cuda_nonglobal_constant);
     return;
   }
-  D->addAttr(::new (S.Context) CUDAConstantAttr(
-      AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) CUDAConstantAttr(S.Context, AL));
 }
 
 static void handleSharedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (checkAttrMutualExclusion<CUDAConstantAttr>(S, D, AL))
     return;
   const auto *VD = cast<VarDecl>(D);
   // extern __shared__ is only allowed on arrays with no length (e.g.
   // "int x[]").
   if (!S.getLangOpts().GPURelocatableDeviceCode && VD->hasExternalStorage() &&
       !isa<IncompleteArrayType>(VD->getType())) {
     S.Diag(AL.getLoc(), diag::err_cuda_extern_shared) << VD;
     return;
   }
   if (S.getLangOpts().CUDA && VD->hasLocalStorage() &&
       S.CUDADiagIfHostCode(AL.getLoc(), diag::err_cuda_host_shared)
           << S.CurrentCUDATarget())
     return;
-  D->addAttr(::new (S.Context) CUDASharedAttr(
-      AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) CUDASharedAttr(S.Context, AL));
 }
 
 static void handleGlobalAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (checkAttrMutualExclusion<CUDADeviceAttr>(S, D, AL) ||
       checkAttrMutualExclusion<CUDAHostAttr>(S, D, AL)) {
     return;
   }
   const auto *FD = cast<FunctionDecl>(D);
if (Method->isInstance()) {
       return;
     }
     S.Diag(Method->getBeginLoc(), diag::warn_kern_is_method) << Method;
   }
   // Only warn for "inline" when compiling for host, to cut down on noise.
   if (FD->isInlineSpecified() && !S.getLangOpts().CUDAIsDevice)
     S.Diag(FD->getBeginLoc(), diag::warn_kern_is_inline) << FD;
 
-  D->addAttr(::new (S.Context)
-              CUDAGlobalAttr(AL.getRange(), S.Context,
-                             AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) CUDAGlobalAttr(S.Context, AL));
 }
 
 static void handleGNUInlineAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   const auto *Fn = cast<FunctionDecl>(D);
   if (!Fn->isInlineSpecified()) {
     S.Diag(AL.getLoc(), diag::warn_gnu_inline_attribute_requires_inline);
     return;
   }
 
-  D->addAttr(::new (S.Context)
-             GNUInlineAttr(AL.getRange(), S.Context,
-                           AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) GNUInlineAttr(S.Context, AL));
 }
 
 static void handleCallConvAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (hasDeclarator(D)) return;
 
   // Diagnostic is emitted elsewhere: here we store the (valid) AL
   // in the Decl node for syntactic reasoning, e.g., pretty-printing.
   CallingConv CC;
   if (S.CheckCallingConvAttr(AL, CC, /*FD*/nullptr))
     return;
 
   if (!isa<ObjCMethodDecl>(D)) {
     S.Diag(AL.getLoc(), diag::warn_attribute_wrong_decl_type)
         << AL << ExpectedFunctionOrMethod;
     return;
   }
 
   switch (AL.getKind()) {
   case ParsedAttr::AT_FastCall:
-    D->addAttr(::new (S.Context)
-               FastCallAttr(AL.getRange(), S.Context,
-                            AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) FastCallAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_StdCall:
-    D->addAttr(::new (S.Context)
-               StdCallAttr(AL.getRange(), S.Context,
-                           AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) StdCallAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_ThisCall:
-    D->addAttr(::new (S.Context)
-               ThisCallAttr(AL.getRange(), S.Context,
-                            AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) ThisCallAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_CDecl:
-    D->addAttr(::new (S.Context)
-               CDeclAttr(AL.getRange(), S.Context,
-                         AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) CDeclAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_Pascal:
-    D->addAttr(::new (S.Context)
-               PascalAttr(AL.getRange(), S.Context,
-                          AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) PascalAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_SwiftCall:
-    D->addAttr(::new (S.Context)
-               SwiftCallAttr(AL.getRange(), S.Context,
-                             AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) SwiftCallAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_VectorCall:
-    D->addAttr(::new (S.Context)
-               VectorCallAttr(AL.getRange(), S.Context,
-                              AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) VectorCallAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_MSABI:
-    D->addAttr(::new (S.Context)
-               MSABIAttr(AL.getRange(), S.Context,
-                         AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) MSABIAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_SysVABI:
-    D->addAttr(::new (S.Context)
-               SysVABIAttr(AL.getRange(), S.Context,
-                           AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) SysVABIAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_RegCall:
-    D->addAttr(::new (S.Context) RegCallAttr(
-        AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) RegCallAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_Pcs: {
     PcsAttr::PCSType PCS;
     switch (CC) {
     case CC_AAPCS:
       PCS = PcsAttr::AAPCS;
       break;
     case CC_AAPCS_VFP:
       PCS = PcsAttr::AAPCS_VFP;
       break;
     default:
       llvm_unreachable("unexpected calling convention in pcs attribute");
     }
 
-    D->addAttr(::new (S.Context)
-               PcsAttr(AL.getRange(), S.Context, PCS,
-                       AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) PcsAttr(S.Context, AL, PCS));
     return;
   }
   case ParsedAttr::AT_AArch64VectorPcs:
-    D->addAttr(::new(S.Context)
-               AArch64VectorPcsAttr(AL.getRange(), S.Context,
-                                    AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) AArch64VectorPcsAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_IntelOclBicc:
-    D->addAttr(::new (S.Context)
-               IntelOclBiccAttr(AL.getRange(), S.Context,
-                                AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) IntelOclBiccAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_PreserveMost:
-    D->addAttr(::new (S.Context) PreserveMostAttr(
-        AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) PreserveMostAttr(S.Context, AL));
     return;
   case ParsedAttr::AT_PreserveAll:
-    D->addAttr(::new (S.Context) PreserveAllAttr(
-        AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
+    D->addAttr(::new (S.Context) PreserveAllAttr(S.Context, AL));
     return;
   default:
     llvm_unreachable("unexpected attribute kind");
   }
 }
 
 static void handleSuppressAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!checkAttributeAtLeastNumArgs(S, AL, 1))
     return;
 
   std::vector<StringRef> DiagnosticIdentifiers;
   for (unsigned I = 0, E = AL.getNumArgs(); I != E; ++I) {
     StringRef RuleName;
 
     if (!S.checkStringLiteralArgumentAttr(AL, I, RuleName, nullptr))
       return;
 
     // FIXME: Warn if the rule name is unknown. This is tricky because only
     // clang-tidy knows about available rules.
     DiagnosticIdentifiers.push_back(RuleName);
   }
-  D->addAttr(::new (S.Context) SuppressAttr(
-      AL.getRange(), S.Context, DiagnosticIdentifiers.data(),
-      DiagnosticIdentifiers.size(), AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context)
+                 SuppressAttr(S.Context, AL, DiagnosticIdentifiers.data(),
+                              DiagnosticIdentifiers.size()));
 }
 
 static void handleLifetimeCategoryAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   TypeSourceInfo *DerefTypeLoc = nullptr;
   QualType ParmType;
   if (AL.hasParsedType()) {
     ParmType = S.GetTypeFromParser(AL.getTypeArg(), &DerefTypeLoc);
 
if (const auto *OAttr = D->getAttr<OwnerAttr>()) {
       if (ExistingDerefType != ParmType.getTypePtrOrNull()) {
         S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible)
             << AL << OAttr;
         S.Diag(OAttr->getLocation(), diag::note_conflicting_attribute);
       }
       return;
     }
     for (Decl *Redecl : D->redecls()) {
-      Redecl->addAttr(::new (S.Context)
-                          OwnerAttr(AL.getRange(), S.Context, DerefTypeLoc,
-                                    AL.getAttributeSpellingListIndex()));
+      Redecl->addAttr(::new (S.Context) OwnerAttr(S.Context, AL, DerefTypeLoc));
     }
   } else {
     if (checkAttrMutualExclusion<OwnerAttr>(S, D, AL))
       return;
     if (const auto *PAttr = D->getAttr<PointerAttr>()) {
       const Type *ExistingDerefType = PAttr->getDerefTypeLoc()
                                           ? PAttr->getDerefType().getTypePtr()
                                           : nullptr;
       if (ExistingDerefType != ParmType.getTypePtrOrNull()) {
         S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible)
             << AL << PAttr;
         S.Diag(PAttr->getLocation(), diag::note_conflicting_attribute);
       }
       return;
     }
     for (Decl *Redecl : D->redecls()) {
       Redecl->addAttr(::new (S.Context)
-                          PointerAttr(AL.getRange(), S.Context, DerefTypeLoc,
-                                      AL.getAttributeSpellingListIndex()));
+                          PointerAttr(S.Context, AL, DerefTypeLoc));
     }
   }
 }
 
 bool Sema::CheckCallingConvAttr(const ParsedAttr &Attrs, CallingConv &CC,
                                 const FunctionDecl *FD) {
   if (Attrs.isInvalid())
     return true;
static bool isValidSwiftErrorResultType(QualType Ty) {
   } else {
     return Ty->isDependentType();
   }
   if (!Ty.getQualifiers().empty())
     return false;
   return isValidSwiftContextType(Ty);
 }
 
-static void handleParameterABIAttr(Sema &S, Decl *D, const ParsedAttr &Attrs,
-                                   ParameterABI Abi) {
-  S.AddParameterABIAttr(Attrs.getRange(), D, Abi,
-                        Attrs.getAttributeSpellingListIndex());
-}
-
-void Sema::AddParameterABIAttr(SourceRange range, Decl *D, ParameterABI abi,
-                               unsigned spellingIndex) {
+void Sema::AddParameterABIAttr(Decl *D, const AttributeCommonInfo &CI,
+                               ParameterABI abi) {
 
   QualType type = cast<ParmVarDecl>(D)->getType();
 
   if (auto existingAttr = D->getAttr<ParameterABIAttr>()) {
     if (existingAttr->getABI() != abi) {
-      Diag(range.getBegin(), diag::err_attributes_are_not_compatible)
+      Diag(CI.getLoc(), diag::err_attributes_are_not_compatible)
           << getParameterABISpelling(abi) << existingAttr;
       Diag(existingAttr->getLocation(), diag::note_conflicting_attribute);
       return;
     }
   }
 
   switch (abi) {
   case ParameterABI::Ordinary:
     llvm_unreachable("explicit attribute for ordinary parameter ABI?");
 
   case ParameterABI::SwiftContext:
     if (!isValidSwiftContextType(type)) {
-      Diag(range.getBegin(), diag::err_swift_abi_parameter_wrong_type)
-        << getParameterABISpelling(abi)
-        << /*pointer to pointer */ 0 << type;
+      Diag(CI.getLoc(), diag::err_swift_abi_parameter_wrong_type)
+          << getParameterABISpelling(abi) << /*pointer to pointer */ 0 << type;
     }
-    D->addAttr(::new (Context)
-               SwiftContextAttr(range, Context, spellingIndex));
+    D->addAttr(::new (Context) SwiftContextAttr(Context, CI));
     return;
 
   case ParameterABI::SwiftErrorResult:
     if (!isValidSwiftErrorResultType(type)) {
-      Diag(range.getBegin(), diag::err_swift_abi_parameter_wrong_type)
-        << getParameterABISpelling(abi)
-        << /*pointer to pointer */ 1 << type;
+      Diag(CI.getLoc(), diag::err_swift_abi_parameter_wrong_type)
+          << getParameterABISpelling(abi) << /*pointer to pointer */ 1 << type;
     }
-    D->addAttr(::new (Context)
-               SwiftErrorResultAttr(range, Context, spellingIndex));
+    D->addAttr(::new (Context) SwiftErrorResultAttr(Context, CI));
     return;
 
   case ParameterABI::SwiftIndirectResult:
     if (!isValidSwiftIndirectResultType(type)) {
-      Diag(range.getBegin(), diag::err_swift_abi_parameter_wrong_type)
-        << getParameterABISpelling(abi)
-        << /*pointer*/ 0 << type;
+      Diag(CI.getLoc(), diag::err_swift_abi_parameter_wrong_type)
+          << getParameterABISpelling(abi) << /*pointer*/ 0 << type;
     }
-    D->addAttr(::new (Context)
-               SwiftIndirectResultAttr(range, Context, spellingIndex));
+    D->addAttr(::new (Context) SwiftIndirectResultAttr(Context, CI));
     return;
   }
   llvm_unreachable("bad parameter ABI attribute");
 }
 
 /// Checks a regparm attribute, returning true if it is ill-formed and
 /// otherwise setting numParams to the appropriate value.
 bool Sema::CheckRegparmAttr(const ParsedAttr &AL, unsigned &numParams) {
InitializedEntity Entity = InitializedEntity::InitializeParameter(
       S.Context, S.Context.getConstType(S.Context.IntTy), /*consume*/ false);
   ExprResult ValArg = S.PerformCopyInitialization(Entity, SourceLocation(), E);
   assert(!ValArg.isInvalid() &&
          "Unexpected PerformCopyInitialization() failure.");
 
   return ValArg.getAs<Expr>();
 }
 
-void Sema::AddLaunchBoundsAttr(SourceRange AttrRange, Decl *D, Expr *MaxThreads,
-                               Expr *MinBlocks, unsigned SpellingListIndex) {
-  CUDALaunchBoundsAttr TmpAttr(AttrRange, Context, MaxThreads, MinBlocks,
-                               SpellingListIndex);
+void Sema::AddLaunchBoundsAttr(Decl *D, const AttributeCommonInfo &CI,
+                               Expr *MaxThreads, Expr *MinBlocks) {
+  CUDALaunchBoundsAttr TmpAttr(Context, CI, MaxThreads, MinBlocks);
   MaxThreads = makeLaunchBoundsArgExpr(*this, MaxThreads, TmpAttr, 0);
   if (MaxThreads == nullptr)
     return;
 
   if (MinBlocks) {
     MinBlocks = makeLaunchBoundsArgExpr(*this, MinBlocks, TmpAttr, 1);
     if (MinBlocks == nullptr)
       return;
   }
 
-  D->addAttr(::new (Context) CUDALaunchBoundsAttr(
-      AttrRange, Context, MaxThreads, MinBlocks, SpellingListIndex));
+  D->addAttr(::new (Context)
+                 CUDALaunchBoundsAttr(Context, CI, MaxThreads, MinBlocks));
 }
 
 static void handleLaunchBoundsAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!checkAttributeAtLeastNumArgs(S, AL, 1) ||
       !checkAttributeAtMostNumArgs(S, AL, 2))
     return;
 
-  S.AddLaunchBoundsAttr(AL.getRange(), D, AL.getArgAsExpr(0),
-                        AL.getNumArgs() > 1 ? AL.getArgAsExpr(1) : nullptr,
-                        AL.getAttributeSpellingListIndex());
+  S.AddLaunchBoundsAttr(D, AL, AL.getArgAsExpr(0),
+                        AL.getNumArgs() > 1 ? AL.getArgAsExpr(1) : nullptr);
 }
 
 static void handleArgumentWithTypeTagAttr(Sema &S, Decl *D,
                                           const ParsedAttr &AL) {
   if (!AL.isArgIdent(0)) {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
         << AL << /* arg num = */ 1 << AANT_ArgumentIdentifier;
     return;
   }
 
   ParamIdx ArgumentIdx;
   if (!checkFunctionOrMethodParameterIndex(S, D, AL, 2, AL.getArgAsExpr(1),
                                            ArgumentIdx))
     return;
 
   ParamIdx TypeTagIdx;
   if (!checkFunctionOrMethodParameterIndex(S, D, AL, 3, AL.getArgAsExpr(2),
                                            TypeTagIdx))
     return;
 
-  bool IsPointer = AL.getName()->getName() == "pointer_with_type_tag";
+  bool IsPointer = AL.getAttrName()->getName() == "pointer_with_type_tag";
   if (IsPointer) {
     // Ensure that buffer has a pointer type.
     unsigned ArgumentIdxAST = ArgumentIdx.getASTIndex();
     if (ArgumentIdxAST >= getFunctionOrMethodNumParams(D) ||
         !getFunctionOrMethodParamType(D, ArgumentIdxAST)->isPointerType())
       S.Diag(AL.getLoc(), diag::err_attribute_pointers_only) << AL << 0;
   }
 
   D->addAttr(::new (S.Context) ArgumentWithTypeTagAttr(
-      AL.getRange(), S.Context, AL.getArgAsIdent(0)->Ident, ArgumentIdx,
-      TypeTagIdx, IsPointer, AL.getAttributeSpellingListIndex()));
+      S.Context, AL, AL.getArgAsIdent(0)->Ident, ArgumentIdx, TypeTagIdx,
+      IsPointer));
 }
 
 static void handleTypeTagForDatatypeAttr(Sema &S, Decl *D,
                                          const ParsedAttr &AL) {
   if (!AL.isArgIdent(0)) {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_n_type)
         << AL << 1 << AANT_ArgumentIdentifier;
     return;
   }
 
   if (!checkAttributeNumArgs(S, AL, 1))
     return;
 
   if (!isa<VarDecl>(D)) {
     S.Diag(AL.getLoc(), diag::err_attribute_wrong_decl_type)
         << AL << ExpectedVariable;
     return;
   }
 
   IdentifierInfo *PointerKind = AL.getArgAsIdent(0)->Ident;
   TypeSourceInfo *MatchingCTypeLoc = nullptr;
   S.GetTypeFromParser(AL.getMatchingCType(), &MatchingCTypeLoc);
   assert(MatchingCTypeLoc && "no type source info for attribute argument");
 
-  D->addAttr(::new (S.Context)
-             TypeTagForDatatypeAttr(AL.getRange(), S.Context, PointerKind,
-                                    MatchingCTypeLoc,
-                                    AL.getLayoutCompatible(),
-                                    AL.getMustBeNull(),
-                                    AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) TypeTagForDatatypeAttr(
+      S.Context, AL, PointerKind, MatchingCTypeLoc, AL.getLayoutCompatible(),
+      AL.getMustBeNull()));
 }
 
 static void handleXRayLogArgsAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   ParamIdx ArgCount;
 
   if (!checkFunctionOrMethodParameterIndex(S, D, AL, 1, AL.getArgAsExpr(0),
                                            ArgCount,
                                            true /* CanIndexImplicitThis */))
     return;
 
   // ArgCount isn't a parameter index [0;n), it's a count [1;n]
-  D->addAttr(::new (S.Context) XRayLogArgsAttr(
-      AL.getRange(), S.Context, ArgCount.getSourceIndex(),
-      AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context)
+                 XRayLogArgsAttr(S.Context, AL, ArgCount.getSourceIndex()));
 }
 
 //===----------------------------------------------------------------------===//
 // Checker-specific attribute handlers.
 //===----------------------------------------------------------------------===//
 static bool isValidSubjectOfNSReturnsRetainedAttribute(QualType QT) {
   return QT->isDependentType() || QT->isObjCRetainableType();
 }

 
 static bool isValidSubjectOfOSAttribute(QualType QT) {
   if (QT->isDependentType())
     return true;
   QualType PT = QT->getPointeeType();
   return !PT.isNull() && PT->getAsCXXRecordDecl() != nullptr;
 }
 
-void Sema::AddXConsumedAttr(Decl *D, SourceRange SR, unsigned SpellingIndex,
+void Sema::AddXConsumedAttr(Decl *D, const AttributeCommonInfo &CI,
                             RetainOwnershipKind K,
                             bool IsTemplateInstantiation) {
   ValueDecl *VD = cast<ValueDecl>(D);
   switch (K) {
   case RetainOwnershipKind::OS:
     handleSimpleAttributeOrDiagnose<OSConsumedAttr>(
-        *this, VD, SR, SpellingIndex, isValidSubjectOfOSAttribute(VD->getType()),
+        *this, VD, CI, isValidSubjectOfOSAttribute(VD->getType()),
         diag::warn_ns_attribute_wrong_parameter_type,
-        /*ExtraArgs=*/SR, "os_consumed", /*pointers*/ 1);
+        /*ExtraArgs=*/CI.getRange(), "os_consumed", /*pointers*/ 1);
     return;
   case RetainOwnershipKind::NS:
     handleSimpleAttributeOrDiagnose<NSConsumedAttr>(
-        *this, VD, SR, SpellingIndex, isValidSubjectOfNSAttribute(VD->getType()),
+        *this, VD, CI, isValidSubjectOfNSAttribute(VD->getType()),
 
         // These attributes are normally just advisory, but in ARC, ns_consumed
         // is significant.  Allow non-dependent code to contain inappropriate
         // attributes even in ARC, but require template instantiations to be
         // set up correctly.
         ((IsTemplateInstantiation && getLangOpts().ObjCAutoRefCount)
              ? diag::err_ns_attribute_wrong_parameter_type
              : diag::warn_ns_attribute_wrong_parameter_type),
-        /*ExtraArgs=*/SR, "ns_consumed", /*objc pointers*/ 0);
+        /*ExtraArgs=*/CI.getRange(), "ns_consumed", /*objc pointers*/ 0);
     return;
   case RetainOwnershipKind::CF:
     handleSimpleAttributeOrDiagnose<CFConsumedAttr>(
-        *this, VD, SR, SpellingIndex,
-        isValidSubjectOfCFAttribute(VD->getType()),
+        *this, VD, CI, isValidSubjectOfCFAttribute(VD->getType()),
         diag::warn_ns_attribute_wrong_parameter_type,
-        /*ExtraArgs=*/SR, "cf_consumed", /*pointers*/1);
+        /*ExtraArgs=*/CI.getRange(), "cf_consumed", /*pointers*/ 1);
     return;
   }
 }
 
 static Sema::RetainOwnershipKind
 parsedAttrToRetainOwnershipKind(const ParsedAttr &AL) {
   switch (AL.getKind()) {
   case ParsedAttr::AT_CFConsumed:
S.Diag(D->getBeginLoc(), diag::warn_ns_attribute_wrong_return_type)
         << SourceRange(loc) << Attrs
         << (isa<ObjCMethodDecl>(D) ? EP_ObjCMethod : EP_ObjCProperty)
         << /*non-retainable pointer*/ 2;
 
     // Drop the attribute.
     return;
   }
 
-  D->addAttr(::new (S.Context) ObjCReturnsInnerPointerAttr(
-      Attrs.getRange(), S.Context, Attrs.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ObjCReturnsInnerPointerAttr(S.Context, Attrs));
 }
 
 static void handleObjCRequiresSuperAttr(Sema &S, Decl *D,
                                         const ParsedAttr &Attrs) {
   const auto *Method = cast<ObjCMethodDecl>(D);
 
   const DeclContext *DC = Method->getDeclContext();
   if (const auto *PDecl = dyn_cast_or_null<ObjCProtocolDecl>(DC)) {
     S.Diag(D->getBeginLoc(), diag::warn_objc_requires_super_protocol) << Attrs
                                                                       << 0;
     S.Diag(PDecl->getLocation(), diag::note_protocol_decl);
     return;
   }
   if (Method->getMethodFamily() == OMF_dealloc) {
     S.Diag(D->getBeginLoc(), diag::warn_objc_requires_super_protocol) << Attrs
                                                                       << 1;
     return;
   }
 
-  D->addAttr(::new (S.Context) ObjCRequiresSuperAttr(
-      Attrs.getRange(), S.Context, Attrs.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ObjCRequiresSuperAttr(S.Context, Attrs));
 }
 
 static void handleObjCBridgeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   IdentifierLoc *Parm = AL.isArgIdent(0) ? AL.getArgAsIdent(0) : nullptr;
 
   if (!Parm) {
     S.Diag(D->getBeginLoc(), diag::err_objc_attr_not_id) << AL << 0;
     return;
if (const auto *TD = dyn_cast<TypedefNameDecl>(D)) {
     // Only allow 'cv void *'.
     QualType T = TD->getUnderlyingType();
     if (!T->isVoidPointerType()) {
       S.Diag(AL.getLoc(), diag::err_objc_attr_typedef_not_void_pointer);
       return;
     }
   }
 
-  D->addAttr(::new (S.Context)
-             ObjCBridgeAttr(AL.getRange(), S.Context, Parm->Ident,
-                           AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ObjCBridgeAttr(S.Context, AL, Parm->Ident));
 }
 
 static void handleObjCBridgeMutableAttr(Sema &S, Decl *D,
                                         const ParsedAttr &AL) {
   IdentifierLoc *Parm = AL.isArgIdent(0) ? AL.getArgAsIdent(0) : nullptr;
 
   if (!Parm) {
     S.Diag(D->getBeginLoc(), diag::err_objc_attr_not_id) << AL << 0;
     return;
   }
 
   D->addAttr(::new (S.Context)
-             ObjCBridgeMutableAttr(AL.getRange(), S.Context, Parm->Ident,
-                            AL.getAttributeSpellingListIndex()));
+                 ObjCBridgeMutableAttr(S.Context, AL, Parm->Ident));
 }
 
 static void handleObjCBridgeRelatedAttr(Sema &S, Decl *D,
                                         const ParsedAttr &AL) {
   IdentifierInfo *RelatedClass =
       AL.isArgIdent(0) ? AL.getArgAsIdent(0)->Ident : nullptr;
   if (!RelatedClass) {
     S.Diag(D->getBeginLoc(), diag::err_objc_attr_not_id) << AL << 0;
     return;
   }
   IdentifierInfo *ClassMethod =
     AL.getArgAsIdent(1) ? AL.getArgAsIdent(1)->Ident : nullptr;
   IdentifierInfo *InstanceMethod =
     AL.getArgAsIdent(2) ? AL.getArgAsIdent(2)->Ident : nullptr;
-  D->addAttr(::new (S.Context)
-             ObjCBridgeRelatedAttr(AL.getRange(), S.Context, RelatedClass,
-                                   ClassMethod, InstanceMethod,
-                                   AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ObjCBridgeRelatedAttr(
+      S.Context, AL, RelatedClass, ClassMethod, InstanceMethod));
 }
 
 static void handleObjCDesignatedInitializer(Sema &S, Decl *D,
                                             const ParsedAttr &AL) {
   DeclContext *Ctx = D->getDeclContext();
 
   // This attribute can only be applied to methods in interfaces or class
   // extensions.
if (auto *CatDecl = dyn_cast<ObjCCategoryDecl>(Ctx))
     IFace = CatDecl->getClassInterface();
   else
     IFace = cast<ObjCInterfaceDecl>(Ctx);
 
   if (!IFace)
     return;
 
   IFace->setHasDesignatedInitializers();
-  D->addAttr(::new (S.Context)
-                  ObjCDesignatedInitializerAttr(AL.getRange(), S.Context,
-                                         AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ObjCDesignatedInitializerAttr(S.Context, AL));
 }
 
 static void handleObjCRuntimeName(Sema &S, Decl *D, const ParsedAttr &AL) {
   StringRef MetaDataName;
   if (!S.checkStringLiteralArgumentAttr(AL, 0, MetaDataName))
     return;
   D->addAttr(::new (S.Context)
-             ObjCRuntimeNameAttr(AL.getRange(), S.Context,
-                                 MetaDataName,
-                                 AL.getAttributeSpellingListIndex()));
+                 ObjCRuntimeNameAttr(S.Context, AL, MetaDataName));
 }
 
 // When a user wants to use objc_boxable with a union or struct
 // but they don't have access to the declaration (legacy/third-party code)
 // then they can 'enable' this feature with a typedef:
 // typedef struct __attribute((objc_boxable)) legacy_struct legacy_struct;
 static void handleObjCBoxable(Sema &S, Decl *D, const ParsedAttr &AL) {
   bool notify = false;
 
   auto *RD = dyn_cast<RecordDecl>(D);
   if (RD && RD->getDefinition()) {
     RD = RD->getDefinition();
     notify = true;
   }
 
   if (RD) {
-    ObjCBoxableAttr *BoxableAttr = ::new (S.Context)
-                          ObjCBoxableAttr(AL.getRange(), S.Context,
-                                          AL.getAttributeSpellingListIndex());
+    ObjCBoxableAttr *BoxableAttr =
+        ::new (S.Context) ObjCBoxableAttr(S.Context, AL);
     RD->addAttr(BoxableAttr);
     if (notify) {
       // we need to notify ASTReader/ASTWriter about
       // modification of existing declaration
       if (ASTMutationListener *L = S.getASTMutationListener())
         L->AddedAttributeToRecord(BoxableAttr, RD);
     }
   }
static void handleObjCPreciseLifetimeAttr(Sema &S, Decl *D,
 
   case Qualifiers::OCL_ExplicitNone:
   case Qualifiers::OCL_Autoreleasing:
     S.Diag(AL.getLoc(), diag::warn_objc_precise_lifetime_meaningless)
         << (Lifetime == Qualifiers::OCL_Autoreleasing);
     break;
   }
 
-  D->addAttr(::new (S.Context)
-             ObjCPreciseLifetimeAttr(AL.getRange(), S.Context,
-                                     AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ObjCPreciseLifetimeAttr(S.Context, AL));
 }
 
 //===----------------------------------------------------------------------===//
 // Microsoft specific attribute handlers.
 //===----------------------------------------------------------------------===//
 
-UuidAttr *Sema::mergeUuidAttr(Decl *D, SourceRange Range,
-                              unsigned AttrSpellingListIndex, StringRef Uuid) {
+UuidAttr *Sema::mergeUuidAttr(Decl *D, const AttributeCommonInfo &CI,
+                              StringRef Uuid) {
   if (const auto *UA = D->getAttr<UuidAttr>()) {
     if (UA->getGuid().equals_lower(Uuid))
       return nullptr;
     Diag(UA->getLocation(), diag::err_mismatched_uuid);
-    Diag(Range.getBegin(), diag::note_previous_uuid);
+    Diag(CI.getLoc(), diag::note_previous_uuid);
     D->dropAttr<UuidAttr>();
   }
 
-  return ::new (Context) UuidAttr(Range, Context, Uuid, AttrSpellingListIndex);
+  return ::new (Context) UuidAttr(Context, CI, Uuid);
 }
 
 static void handleUuidAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!S.LangOpts.CPlusPlus) {
     S.Diag(AL.getLoc(), diag::err_attribute_not_supported_in_lang)
         << AL << AttributeLangSupport::C;
     return;
   }
static void handleUuidAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // the only thing in the [] list, the [] too), and add an insertion of
   // __declspec(uuid(...)).  But sadly, neither the SourceLocs of the commas
   // separating attributes nor of the [ and the ] are in the AST.
   // Cf "SourceLocations of attribute list delimiters - [[ ... , ... ]] etc"
   // on cfe-dev.
   if (AL.isMicrosoftAttribute()) // Check for [uuid(...)] spelling.
     S.Diag(AL.getLoc(), diag::warn_atl_uuid_deprecated);
 
-  UuidAttr *UA = S.mergeUuidAttr(D, AL.getRange(),
-                                 AL.getAttributeSpellingListIndex(), StrRef);
+  UuidAttr *UA = S.mergeUuidAttr(D, AL, StrRef);
   if (UA)
     D->addAttr(UA);
 }
 
 static void handleMSInheritanceAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!S.LangOpts.CPlusPlus) {
     S.Diag(AL.getLoc(), diag::err_attribute_not_supported_in_lang)
         << AL << AttributeLangSupport::C;
     return;
   }
   MSInheritanceAttr *IA = S.mergeMSInheritanceAttr(
-      D, AL.getRange(), /*BestCase=*/true,
-      AL.getAttributeSpellingListIndex(),
+      D, AL, /*BestCase=*/true,
       (MSInheritanceAttr::Spelling)AL.getSemanticSpelling());
   if (IA) {
     D->addAttr(IA);
     S.Consumer.AssignInheritanceModel(cast<CXXRecordDecl>(D));
   }
 }
 
 static void handleDeclspecThreadAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   const auto *VD = cast<VarDecl>(D);
   if (!S.Context.getTargetInfo().isTLSSupported()) {
     S.Diag(AL.getLoc(), diag::err_thread_unsupported);
     return;
   }
   if (VD->getTSCSpec() != TSCS_unspecified) {
     S.Diag(AL.getLoc(), diag::err_declspec_thread_on_thread_variable);
     return;
   }
   if (VD->hasLocalStorage()) {
     S.Diag(AL.getLoc(), diag::err_thread_non_global) << "__declspec(thread)";
     return;
   }
-  D->addAttr(::new (S.Context) ThreadAttr(AL.getRange(), S.Context,
-                                          AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ThreadAttr(S.Context, AL));
 }
 
 static void handleAbiTagAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   SmallVector<StringRef, 4> Tags;
   for (unsigned I = 0, E = AL.getNumArgs(); I != E; ++I) {
     StringRef Tag;
     if (!S.checkStringLiteralArgumentAttr(AL, I, Tag))
       return;
static void handleAbiTagAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   } else if (!checkAttributeAtLeastNumArgs(S, AL, 1))
     return;
 
   // Store tags sorted and without duplicates.
   llvm::sort(Tags);
   Tags.erase(std::unique(Tags.begin(), Tags.end()), Tags.end());
 
   D->addAttr(::new (S.Context)
-             AbiTagAttr(AL.getRange(), S.Context, Tags.data(), Tags.size(),
-                        AL.getAttributeSpellingListIndex()));
+                 AbiTagAttr(S.Context, AL, Tags.data(), Tags.size()));
 }
 
 static void handleARMInterruptAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // Check the attribute arguments.
   if (AL.getNumArgs() > 1) {
     S.Diag(AL.getLoc(), diag::err_attribute_too_many_arguments) << AL << 1;
     return;
   }
 
   StringRef Str;
   SourceLocation ArgLoc;
 
   if (AL.getNumArgs() == 0)
     Str = "";
   else if (!S.checkStringLiteralArgumentAttr(AL, 0, Str, &ArgLoc))
     return;
 
   ARMInterruptAttr::InterruptType Kind;
   if (!ARMInterruptAttr::ConvertStrToInterruptType(Str, Kind)) {
     S.Diag(AL.getLoc(), diag::warn_attribute_type_not_supported) << AL << Str
                                                                  << ArgLoc;
     return;
   }
 
-  unsigned Index = AL.getAttributeSpellingListIndex();
-  D->addAttr(::new (S.Context)
-             ARMInterruptAttr(AL.getLoc(), S.Context, Kind, Index));
+  D->addAttr(::new (S.Context) ARMInterruptAttr(S.Context, AL, Kind));
 }
 
 static void handleMSP430InterruptAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // MSP430 'interrupt' attribute is applied to
   // a function with no parameters and void return type.
   if (!isFunctionOrMethod(D)) {
     S.Diag(D->getLocation(), diag::warn_attribute_wrong_decl_type)
         << "'interrupt'" << ExpectedFunctionOrMethod;
static void handleMSP430InterruptAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   unsigned Num = NumParams.getLimitedValue(255);
   if (Num > 63) {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_out_of_bounds)
         << AL << (int)NumParams.getSExtValue()
         << NumParamsExpr->getSourceRange();
     return;
   }
 
-  D->addAttr(::new (S.Context)
-              MSP430InterruptAttr(AL.getLoc(), S.Context, Num,
-                                  AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) MSP430InterruptAttr(S.Context, AL, Num));
   D->addAttr(UsedAttr::CreateImplicit(S.Context));
 }
 
 static void handleMipsInterruptAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // Only one optional argument permitted.
   if (AL.getNumArgs() > 1) {
     S.Diag(AL.getLoc(), diag::err_attribute_too_many_arguments) << AL << 1;
     return;
static void handleMipsInterruptAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
 
   MipsInterruptAttr::InterruptType Kind;
   if (!MipsInterruptAttr::ConvertStrToInterruptType(Str, Kind)) {
     S.Diag(AL.getLoc(), diag::warn_attribute_type_not_supported)
         << AL << "'" + std::string(Str) + "'";
     return;
   }
 
-  D->addAttr(::new (S.Context) MipsInterruptAttr(
-      AL.getLoc(), S.Context, Kind, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) MipsInterruptAttr(S.Context, AL, Kind));
 }
 
 static void handleAnyX86InterruptAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // Semantic checks for a function with the 'interrupt' attribute.
   // a) Must be a function.
   // b) Must have the 'void' return type.
   // c) Must take 1 or 2 arguments.
   // d) The 1st argument must be a pointer.
if (NumParams == 2 &&
     S.Diag(getFunctionOrMethodParamRange(D, 1).getBegin(),
            diag::err_anyx86_interrupt_attribute)
         << (S.Context.getTargetInfo().getTriple().getArch() == llvm::Triple::x86
                 ? 0
                 : 1)
         << 3 << S.Context.getIntTypeForBitwidth(TypeSize, /*Signed=*/false);
     return;
   }
-  D->addAttr(::new (S.Context) AnyX86InterruptAttr(
-      AL.getLoc(), S.Context, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) AnyX86InterruptAttr(S.Context, AL));
   D->addAttr(UsedAttr::CreateImplicit(S.Context));
 }
 
 static void handleAVRInterruptAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!isFunctionOrMethod(D)) {
     S.Diag(D->getLocation(), diag::warn_attribute_wrong_decl_type)
         << "'interrupt'" << ExpectedFunction;
     return;
if (FD->isThisDeclarationADefinition()) {
     return;
   }
 
   StringRef Str;
   SourceLocation ArgLoc;
   if (!S.checkStringLiteralArgumentAttr(AL, 0, Str, &ArgLoc))
     return;
 
-  FD->addAttr(::new (S.Context) WebAssemblyImportModuleAttr(
-      AL.getRange(), S.Context, Str,
-      AL.getAttributeSpellingListIndex()));
+  FD->addAttr(::new (S.Context)
+                  WebAssemblyImportModuleAttr(S.Context, AL, Str));
 }
 
 static void handleWebAssemblyImportNameAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!isFunctionOrMethod(D)) {
     S.Diag(D->getLocation(), diag::warn_attribute_wrong_decl_type)
         << "'import_name'" << ExpectedFunction;
     return;
   }
 
   auto *FD = cast<FunctionDecl>(D);
   if (FD->isThisDeclarationADefinition()) {
     S.Diag(D->getLocation(), diag::err_alias_is_definition) << FD << 0;
     return;
   }
 
   StringRef Str;
   SourceLocation ArgLoc;
   if (!S.checkStringLiteralArgumentAttr(AL, 0, Str, &ArgLoc))
     return;
 
-  FD->addAttr(::new (S.Context) WebAssemblyImportNameAttr(
-      AL.getRange(), S.Context, Str,
-      AL.getAttributeSpellingListIndex()));
+  FD->addAttr(::new (S.Context) WebAssemblyImportNameAttr(S.Context, AL, Str));
 }
 
 static void handleRISCVInterruptAttr(Sema &S, Decl *D,
                                      const ParsedAttr &AL) {
   // Warn about repeated attributes.
   if (const auto *A = D->getAttr<RISCVInterruptAttr>()) {
     S.Diag(AL.getRange().getBegin(),
       diag::warn_riscv_repeated_interrupt_attribute);
static void handleRISCVInterruptAttr(Sema &S, Decl *D,
 
   RISCVInterruptAttr::InterruptType Kind;
   if (!RISCVInterruptAttr::ConvertStrToInterruptType(Str, Kind)) {
     S.Diag(AL.getLoc(), diag::warn_attribute_type_not_supported) << AL << Str
                                                                  << ArgLoc;
     return;
   }
 
-  D->addAttr(::new (S.Context) RISCVInterruptAttr(
-    AL.getLoc(), S.Context, Kind, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) RISCVInterruptAttr(S.Context, AL, Kind));
 }
 
 static void handleInterruptAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // Dispatch the interrupt attribute based on the current target.
   switch (S.Context.getTargetInfo().getTriple().getArch()) {
   case llvm::Triple::msp430:
     handleMSP430InterruptAttr(S, D, AL);
     break;
if (Min > Max) {
     S.Diag(Attr.getLocation(), diag::err_attribute_argument_invalid)
         << &Attr << 1;
     return true;
   }
 
   return false;
 }
 
-void Sema::addAMDGPUFlatWorkGroupSizeAttr(SourceRange AttrRange, Decl *D,
-                                          Expr *MinExpr, Expr *MaxExpr,
-                                          unsigned SpellingListIndex) {
-  AMDGPUFlatWorkGroupSizeAttr TmpAttr(AttrRange, Context, MinExpr, MaxExpr,
-                                      SpellingListIndex);
+void Sema::addAMDGPUFlatWorkGroupSizeAttr(Decl *D,
+                                          const AttributeCommonInfo &CI,
+                                          Expr *MinExpr, Expr *MaxExpr) {
+  AMDGPUFlatWorkGroupSizeAttr TmpAttr(Context, CI, MinExpr, MaxExpr);
 
   if (checkAMDGPUFlatWorkGroupSizeArguments(*this, MinExpr, MaxExpr, TmpAttr))
     return;
 
-  D->addAttr(::new (Context) AMDGPUFlatWorkGroupSizeAttr(
-      AttrRange, Context, MinExpr, MaxExpr, SpellingListIndex));
+  D->addAttr(::new (Context)
+                 AMDGPUFlatWorkGroupSizeAttr(Context, CI, MinExpr, MaxExpr));
 }
 
 static void handleAMDGPUFlatWorkGroupSizeAttr(Sema &S, Decl *D,
                                               const ParsedAttr &AL) {
   Expr *MinExpr = AL.getArgAsExpr(0);
   Expr *MaxExpr = AL.getArgAsExpr(1);
 
-  S.addAMDGPUFlatWorkGroupSizeAttr(AL.getRange(), D, MinExpr, MaxExpr,
-                                   AL.getAttributeSpellingListIndex());
+  S.addAMDGPUFlatWorkGroupSizeAttr(D, AL, MinExpr, MaxExpr);
 }
 
 static bool checkAMDGPUWavesPerEUArguments(Sema &S, Expr *MinExpr,
                                            Expr *MaxExpr,
                                            const AMDGPUWavesPerEUAttr &Attr) {
   if (S.DiagnoseUnexpandedParameterPack(MinExpr) ||
       (MaxExpr && S.DiagnoseUnexpandedParameterPack(MaxExpr)))
     return true;
if (Max != 0 && Min > Max) {
     S.Diag(Attr.getLocation(), diag::err_attribute_argument_invalid)
         << &Attr << 1;
     return true;
   }
 
   return false;
 }
 
-void Sema::addAMDGPUWavesPerEUAttr(SourceRange AttrRange, Decl *D,
-                                   Expr *MinExpr, Expr *MaxExpr,
-                                   unsigned SpellingListIndex) {
-  AMDGPUWavesPerEUAttr TmpAttr(AttrRange, Context, MinExpr, MaxExpr,
-                               SpellingListIndex);
+void Sema::addAMDGPUWavesPerEUAttr(Decl *D, const AttributeCommonInfo &CI,
+                                   Expr *MinExpr, Expr *MaxExpr) {
+  AMDGPUWavesPerEUAttr TmpAttr(Context, CI, MinExpr, MaxExpr);
 
   if (checkAMDGPUWavesPerEUArguments(*this, MinExpr, MaxExpr, TmpAttr))
     return;
 
-  D->addAttr(::new (Context) AMDGPUWavesPerEUAttr(AttrRange, Context, MinExpr,
-                                                  MaxExpr, SpellingListIndex));
+  D->addAttr(::new (Context)
+                 AMDGPUWavesPerEUAttr(Context, CI, MinExpr, MaxExpr));
 }
 
 static void handleAMDGPUWavesPerEUAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (!checkAttributeAtLeastNumArgs(S, AL, 1) ||
       !checkAttributeAtMostNumArgs(S, AL, 2))
     return;
 
   Expr *MinExpr = AL.getArgAsExpr(0);
   Expr *MaxExpr = (AL.getNumArgs() > 1) ? AL.getArgAsExpr(1) : nullptr;
 
-  S.addAMDGPUWavesPerEUAttr(AL.getRange(), D, MinExpr, MaxExpr,
-                            AL.getAttributeSpellingListIndex());
+  S.addAMDGPUWavesPerEUAttr(D, AL, MinExpr, MaxExpr);
 }
 
 static void handleAMDGPUNumSGPRAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   uint32_t NumSGPR = 0;
   Expr *NumSGPRExpr = AL.getArgAsExpr(0);
   if (!checkUInt32Argument(S, AL, NumSGPRExpr, NumSGPR))
     return;
 
-  D->addAttr(::new (S.Context)
-             AMDGPUNumSGPRAttr(AL.getLoc(), S.Context, NumSGPR,
-                               AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) AMDGPUNumSGPRAttr(S.Context, AL, NumSGPR));
 }
 
 static void handleAMDGPUNumVGPRAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   uint32_t NumVGPR = 0;
   Expr *NumVGPRExpr = AL.getArgAsExpr(0);
   if (!checkUInt32Argument(S, AL, NumVGPRExpr, NumVGPR))
     return;
 
-  D->addAttr(::new (S.Context)
-             AMDGPUNumVGPRAttr(AL.getLoc(), S.Context, NumVGPR,
-                               AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) AMDGPUNumVGPRAttr(S.Context, AL, NumVGPR));
 }
 
 static void handleX86ForceAlignArgPointerAttr(Sema &S, Decl *D,
                                               const ParsedAttr &AL) {
   // If we try to apply it to a function pointer, don't warn, but don't
   // do anything, either. It doesn't matter anyway, because there's nothing
   // special about calling a force_align_arg_pointer function.
   const auto *VD = dyn_cast<ValueDecl>(D);
   if (VD && VD->getType()->isFunctionPointerType())
     return;
   // Also don't warn on function pointer typedefs.
   const auto *TD = dyn_cast<TypedefNameDecl>(D);
   if (TD && (TD->getUnderlyingType()->isFunctionPointerType() ||
     TD->getUnderlyingType()->isFunctionType()))
     return;
   // Attribute can only be applied to function types.
   if (!isa<FunctionDecl>(D)) {
     S.Diag(AL.getLoc(), diag::warn_attribute_wrong_decl_type)
         << AL << ExpectedFunction;
     return;
   }
 
-  D->addAttr(::new (S.Context)
-              X86ForceAlignArgPointerAttr(AL.getRange(), S.Context,
-                                        AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) X86ForceAlignArgPointerAttr(S.Context, AL));
 }
 
 static void handleLayoutVersion(Sema &S, Decl *D, const ParsedAttr &AL) {
   uint32_t Version;
   Expr *VersionExpr = static_cast<Expr *>(AL.getArgAsExpr(0));
   if (!checkUInt32Argument(S, AL, AL.getArgAsExpr(0), Version))
     return;
 
   // TODO: Investigate what happens with the next major version of MSVC.
   if (Version != LangOptions::MSVC2015 / 100) {
     S.Diag(AL.getLoc(), diag::err_attribute_argument_out_of_bounds)
         << AL << Version << VersionExpr->getSourceRange();
     return;
   }
 
   // The attribute expects a "major" version number like 19, but new versions of
   // MSVC have moved to updating the "minor", or less significant numbers, so we
   // have to multiply by 100 now.
   Version *= 100;
 
-  D->addAttr(::new (S.Context)
-                 LayoutVersionAttr(AL.getRange(), S.Context, Version,
-                                   AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) LayoutVersionAttr(S.Context, AL, Version));
 }
 
-DLLImportAttr *Sema::mergeDLLImportAttr(Decl *D, SourceRange Range,
-                                        unsigned AttrSpellingListIndex) {
+DLLImportAttr *Sema::mergeDLLImportAttr(Decl *D,
+                                        const AttributeCommonInfo &CI) {
   if (D->hasAttr<DLLExportAttr>()) {
-    Diag(Range.getBegin(), diag::warn_attribute_ignored) << "'dllimport'";
+    Diag(CI.getLoc(), diag::warn_attribute_ignored) << "'dllimport'";
     return nullptr;
   }
 
   if (D->hasAttr<DLLImportAttr>())
     return nullptr;
 
-  return ::new (Context) DLLImportAttr(Range, Context, AttrSpellingListIndex);
+  return ::new (Context) DLLImportAttr(Context, CI);
 }
 
-DLLExportAttr *Sema::mergeDLLExportAttr(Decl *D, SourceRange Range,
-                                        unsigned AttrSpellingListIndex) {
+DLLExportAttr *Sema::mergeDLLExportAttr(Decl *D,
+                                        const AttributeCommonInfo &CI) {
   if (DLLImportAttr *Import = D->getAttr<DLLImportAttr>()) {
     Diag(Import->getLocation(), diag::warn_attribute_ignored) << Import;
     D->dropAttr<DLLImportAttr>();
   }
 
   if (D->hasAttr<DLLExportAttr>())
     return nullptr;
 
-  return ::new (Context) DLLExportAttr(Range, Context, AttrSpellingListIndex);
+  return ::new (Context) DLLExportAttr(Context, CI);
 }
 
 static void handleDLLAttr(Sema &S, Decl *D, const ParsedAttr &A) {
   if (isa<ClassTemplatePartialSpecializationDecl>(D) &&
       S.Context.getTargetInfo().getCXXABI().isMicrosoft()) {
     S.Diag(A.getRange().getBegin(), diag::warn_attribute_ignored) << A;
     return;
   }
static void handleDLLAttr(Sema &S, Decl *D, const ParsedAttr &A) {
   if (const auto *MD = dyn_cast<CXXMethodDecl>(D)) {
     if (S.Context.getTargetInfo().getCXXABI().isMicrosoft() &&
         MD->getParent()->isLambda()) {
       S.Diag(A.getRange().getBegin(), diag::err_attribute_dll_lambda) << A;
       return;
     }
   }
 
-  unsigned Index = A.getAttributeSpellingListIndex();
   Attr *NewAttr = A.getKind() == ParsedAttr::AT_DLLExport
-                      ? (Attr *)S.mergeDLLExportAttr(D, A.getRange(), Index)
-                      : (Attr *)S.mergeDLLImportAttr(D, A.getRange(), Index);
+                      ? (Attr *)S.mergeDLLExportAttr(D, A)
+                      : (Attr *)S.mergeDLLImportAttr(D, A);
   if (NewAttr)
     D->addAttr(NewAttr);
 }
 
 MSInheritanceAttr *
-Sema::mergeMSInheritanceAttr(Decl *D, SourceRange Range, bool BestCase,
-                             unsigned AttrSpellingListIndex,
+Sema::mergeMSInheritanceAttr(Decl *D, const AttributeCommonInfo &CI,
+                             bool BestCase,
                              MSInheritanceAttr::Spelling SemanticSpelling) {
   if (MSInheritanceAttr *IA = D->getAttr<MSInheritanceAttr>()) {
     if (IA->getSemanticSpelling() == SemanticSpelling)
       return nullptr;
     Diag(IA->getLocation(), diag::err_mismatched_ms_inheritance)
         << 1 /*previous declaration*/;
-    Diag(Range.getBegin(), diag::note_previous_ms_inheritance);
+    Diag(CI.getLoc(), diag::note_previous_ms_inheritance);
     D->dropAttr<MSInheritanceAttr>();
   }
 
   auto *RD = cast<CXXRecordDecl>(D);
   if (RD->hasDefinition()) {
-    if (checkMSInheritanceAttrOnDefinition(RD, Range, BestCase,
+    if (checkMSInheritanceAttrOnDefinition(RD, CI.getRange(), BestCase,
                                            SemanticSpelling)) {
       return nullptr;
     }
   } else {
     if (isa<ClassTemplatePartialSpecializationDecl>(RD)) {
-      Diag(Range.getBegin(), diag::warn_ignored_ms_inheritance)
+      Diag(CI.getLoc(), diag::warn_ignored_ms_inheritance)
           << 1 /*partial specialization*/;
       return nullptr;
     }
     if (RD->getDescribedClassTemplate()) {
-      Diag(Range.getBegin(), diag::warn_ignored_ms_inheritance)
+      Diag(CI.getLoc(), diag::warn_ignored_ms_inheritance)
           << 0 /*primary template*/;
       return nullptr;
     }
   }
 
-  return ::new (Context)
-      MSInheritanceAttr(Range, Context, BestCase, AttrSpellingListIndex);
+  return ::new (Context) MSInheritanceAttr(Context, CI, BestCase);
 }
 
 static void handleCapabilityAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   // The capability attributes take a single string parameter for the name of
   // the capability they represent. The lockable attribute does not take any
   // parameters. However, semantically, both attributes represent the same
   // concept, and so they use the same semantic attribute. Eventually, the
   // lockable attribute will be removed.
   //
   // For backward compatibility, any capability which has no specified string
   // literal will be considered a "mutex."
   StringRef N("mutex");
   SourceLocation LiteralLoc;
   if (AL.getKind() == ParsedAttr::AT_Capability &&
       !S.checkStringLiteralArgumentAttr(AL, 0, N, &LiteralLoc))
     return;
 
   // Currently, there are only two names allowed for a capability: role and
   // mutex (case insensitive). Diagnose other capability names.
   if (!N.equals_lower("mutex") && !N.equals_lower("role"))
     S.Diag(LiteralLoc, diag::warn_invalid_capability_name) << N;
 
-  D->addAttr(::new (S.Context) CapabilityAttr(AL.getRange(), S.Context, N,
-                                        AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) CapabilityAttr(S.Context, AL, N));
 }
 
 static void handleAssertCapabilityAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   SmallVector<Expr*, 1> Args;
   if (!checkLockFunAttrCommon(S, D, AL, Args))
     return;
 
-  D->addAttr(::new (S.Context) AssertCapabilityAttr(AL.getRange(), S.Context,
-                                                    Args.data(), Args.size(),
-                                        AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context)
+                 AssertCapabilityAttr(S.Context, AL, Args.data(), Args.size()));
 }
 
 static void handleAcquireCapabilityAttr(Sema &S, Decl *D,
                                         const ParsedAttr &AL) {
   SmallVector<Expr*, 1> Args;
   if (!checkLockFunAttrCommon(S, D, AL, Args))
     return;
 
-  D->addAttr(::new (S.Context) AcquireCapabilityAttr(AL.getRange(),
-                                                     S.Context,
-                                                     Args.data(), Args.size(),
-                                        AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) AcquireCapabilityAttr(S.Context, AL, Args.data(),
+                                                     Args.size()));
 }
 
 static void handleTryAcquireCapabilityAttr(Sema &S, Decl *D,
                                            const ParsedAttr &AL) {
   SmallVector<Expr*, 2> Args;
   if (!checkTryLockFunAttrCommon(S, D, AL, Args))
     return;
 
-  D->addAttr(::new (S.Context) TryAcquireCapabilityAttr(AL.getRange(),
-                                                        S.Context,
-                                                        AL.getArgAsExpr(0),
-                                                        Args.data(),
-                                                        Args.size(),
-                                        AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) TryAcquireCapabilityAttr(
+      S.Context, AL, AL.getArgAsExpr(0), Args.data(), Args.size()));
 }
 
 static void handleReleaseCapabilityAttr(Sema &S, Decl *D,
                                         const ParsedAttr &AL) {
   // Check that all arguments are lockable objects.
   SmallVector<Expr *, 1> Args;
   checkAttrArgsAreCapabilityObjs(S, D, AL, Args, 0, true);
 
-  D->addAttr(::new (S.Context) ReleaseCapabilityAttr(
-      AL.getRange(), S.Context, Args.data(), Args.size(),
-      AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) ReleaseCapabilityAttr(S.Context, AL, Args.data(),
+                                                     Args.size()));
 }
 
 static void handleRequiresCapabilityAttr(Sema &S, Decl *D,
                                          const ParsedAttr &AL) {
   if (!checkAttributeAtLeastNumArgs(S, AL, 1))
     return;
 
   // check that all arguments are lockable objects
   SmallVector<Expr*, 1> Args;
   checkAttrArgsAreCapabilityObjs(S, D, AL, Args);
   if (Args.empty())
     return;
 
   RequiresCapabilityAttr *RCA = ::new (S.Context)
-    RequiresCapabilityAttr(AL.getRange(), S.Context, Args.data(),
-                           Args.size(), AL.getAttributeSpellingListIndex());
+      RequiresCapabilityAttr(S.Context, AL, Args.data(), Args.size());
 
   D->addAttr(RCA);
 }
 
 static void handleDeprecatedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (const auto *NSD = dyn_cast<NamespaceDecl>(D)) {
     if (NSD->isAnonymousNamespace()) {
       S.Diag(AL.getLoc(), diag::warn_deprecated_anonymous_namespace);
if (AL.isDeclspecAttribute() || AL.isCXX11Attribute())
     checkAttributeAtMostNumArgs(S, AL, 1);
   else if (AL.isArgExpr(1) && AL.getArgAsExpr(1) &&
            !S.checkStringLiteralArgumentAttr(AL, 1, Replacement))
     return;
 
   if (!S.getLangOpts().CPlusPlus14 && AL.isCXX11Attribute() && !AL.isGNUScope())
     S.Diag(AL.getLoc(), diag::ext_cxx14_attr) << AL;
 
-  D->addAttr(::new (S.Context)
-                 DeprecatedAttr(AL.getRange(), S.Context, Str, Replacement,
-                                AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) DeprecatedAttr(S.Context, AL, Str, Replacement));
 }
 
 static bool isGlobalVar(const Decl *D) {
   if (const auto *S = dyn_cast<VarDecl>(D))
     return S->hasGlobalStorage();
   return false;
 }
 
if (parseSanitizerValue(SanitizerName, /*AllowGroups=*/true) ==
         SanitizerMask())
       S.Diag(LiteralLoc, diag::warn_unknown_sanitizer_ignored) << SanitizerName;
     else if (isGlobalVar(D) && SanitizerName != "address")
       S.Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
           << AL << ExpectedFunctionOrMethod;
     Sanitizers.push_back(SanitizerName);
   }
 
-  D->addAttr(::new (S.Context) NoSanitizeAttr(
-      AL.getRange(), S.Context, Sanitizers.data(), Sanitizers.size(),
-      AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) NoSanitizeAttr(S.Context, AL, Sanitizers.data(),
+                                              Sanitizers.size()));
 }
 
 static void handleNoSanitizeSpecificAttr(Sema &S, Decl *D,
                                          const ParsedAttr &AL) {
-  StringRef AttrName = AL.getName()->getName();
+  StringRef AttrName = AL.getAttrName()->getName();
   normalizeName(AttrName);
   StringRef SanitizerName = llvm::StringSwitch<StringRef>(AttrName)
                                 .Case("no_address_safety_analysis", "address")
                                 .Case("no_sanitize_address", "address")
                                 .Case("no_sanitize_thread", "thread")
                                 .Case("no_sanitize_memory", "memory");
   if (isGlobalVar(D) && SanitizerName != "address")
     S.Diag(D->getLocation(), diag::err_attribute_wrong_decl_type)
         << AL << ExpectedFunction;
 
   // FIXME: Rather than create a NoSanitizeSpecificAttr, this creates a
   // NoSanitizeAttr object; but we need to calculate the correct spelling list
   // index rather than incorrectly assume the index for NoSanitizeSpecificAttr
   // has the same spellings as the index for NoSanitizeAttr. We don't have a
   // general way to "translate" between the two, so this hack attempts to work
   // around the issue with hard-coded indicies. This is critical for calling
   // getSpelling() or prettyPrint() on the resulting semantic attribute object
   // without failing assertions.
   unsigned TranslatedSpellingIndex = 0;
   if (AL.isC2xAttribute() || AL.isCXX11Attribute())
     TranslatedSpellingIndex = 1;
 
-  D->addAttr(::new (S.Context) NoSanitizeAttr(
-      AL.getRange(), S.Context, &SanitizerName, 1, TranslatedSpellingIndex));
+  AttributeCommonInfo Info = AL;
+  Info.setAttributeSpellingListIndex(TranslatedSpellingIndex);
+  D->addAttr(::new (S.Context)
+                 NoSanitizeAttr(S.Context, Info, &SanitizerName, 1));
 }
 
 static void handleInternalLinkageAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (InternalLinkageAttr *Internal = S.mergeInternalLinkageAttr(D, AL))
     D->addAttr(Internal);
 }
 
 static void handleOpenCLNoSVMAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
static void handleOpenCLAccessAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   if (D->isInvalidDecl())
     return;
 
   // Check if there is only one access qualifier.
   if (D->hasAttr<OpenCLAccessAttr>()) {
     if (D->getAttr<OpenCLAccessAttr>()->getSemanticSpelling() ==
         AL.getSemanticSpelling()) {
       S.Diag(AL.getLoc(), diag::warn_duplicate_declspec)
-          << AL.getName()->getName() << AL.getRange();
+          << AL.getAttrName()->getName() << AL.getRange();
     } else {
       S.Diag(AL.getLoc(), diag::err_opencl_multiple_access_qualifiers)
           << D->getSourceRange();
       D->setInvalidDecl(true);
       return;
     }
   }
 
   // OpenCL v2.0 s6.6 - read_write can be used for image types to specify that an
   // image object can be read and written.
   // OpenCL v2.0 s6.13.6 - A kernel cannot read from and write to the same pipe
   // object. Using the read_write (or __read_write) qualifier with the pipe
   // qualifier is a compilation error.
   if (const auto *PDecl = dyn_cast<ParmVarDecl>(D)) {
     const Type *DeclTy = PDecl->getType().getCanonicalType().getTypePtr();
-    if (AL.getName()->getName().find("read_write") != StringRef::npos) {
+    if (AL.getAttrName()->getName().find("read_write") != StringRef::npos) {
       if ((!S.getLangOpts().OpenCLCPlusPlus &&
            S.getLangOpts().OpenCLVersion < 200) ||
           DeclTy->isPipeType()) {
         S.Diag(AL.getLoc(), diag::err_opencl_invalid_read_write)
             << AL << PDecl->getType() << DeclTy->isImageType();
         D->setInvalidDecl(true);
         return;
       }
     }
   }
 
-  D->addAttr(::new (S.Context) OpenCLAccessAttr(
-      AL.getRange(), S.Context, AL.getAttributeSpellingListIndex()));
+  D->addAttr(::new (S.Context) OpenCLAccessAttr(S.Context, AL));
 }
 
 static void handleDestroyAttr(Sema &S, Decl *D, const ParsedAttr &A) {
   if (!cast<VarDecl>(D)->hasGlobalStorage()) {
     S.Diag(D->getLocation(), diag::err_destroy_attr_on_non_static_var)
         << (A.getKind() == ParsedAttr::AT_AlwaysDestroy);
     return;
   }
 
   if (A.getKind() == ParsedAttr::AT_AlwaysDestroy)
     handleSimpleAttributeWithExclusions<AlwaysDestroyAttr, NoDestroyAttr>(S, D, A);
   else
     handleSimpleAttributeWithExclusions<NoDestroyAttr, AlwaysDestroyAttr>(S, D, A);
 }
 
 static void handleUninitializedAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   assert(cast<VarDecl>(D)->getStorageDuration() == SD_Automatic &&
          "uninitialized is only valid on automatic duration variables");
-  unsigned Index = AL.getAttributeSpellingListIndex();
-  D->addAttr(::new (S.Context)
-                 UninitializedAttr(AL.getLoc(), S.Context, Index));
+  D->addAttr(::new (S.Context) UninitializedAttr(S.Context, AL));
 }
 
 static bool tryMakeVariablePseudoStrong(Sema &S, VarDecl *VD,
                                         bool DiagnoseFailure) {
   QualType Ty = VD->getType();
   if (!Ty->isObjCRetainableType()) {
     if (DiagnoseFailure) {
       S.Diag(VD->getBeginLoc(), diag::warn_ignored_objc_externally_retained)
case ParsedAttr::AT_CFAuditedTransfer:
     break;
   case ParsedAttr::AT_CFUnknownTransfer:
     handleSimpleAttributeWithExclusions<CFUnknownTransferAttr,
                                         CFAuditedTransferAttr>(S, D, AL);
     break;
   case ParsedAttr::AT_CFConsumed:
   case ParsedAttr::AT_NSConsumed:
   case ParsedAttr::AT_OSConsumed:
-    S.AddXConsumedAttr(D, AL.getRange(), AL.getAttributeSpellingListIndex(),
-                     parsedAttrToRetainOwnershipKind(AL),
+    S.AddXConsumedAttr(D, AL, parsedAttrToRetainOwnershipKind(AL),
                        /*IsTemplateInstantiation=*/false);
     break;
   case ParsedAttr::AT_NSConsumesSelf:
     handleSimpleAttribute<NSConsumesSelfAttr>(S, D, AL);
     break;
   case ParsedAttr::AT_OSConsumesThis:
     handleSimpleAttribute<OSConsumesThisAttr>(S, D, AL);
     break;
   case ParsedAttr::AT_OSReturnsRetainedOnZero:
case ParsedAttr::AT_OpenCLKernel:
     break;
   case ParsedAttr::AT_OpenCLAccess:
     handleOpenCLAccessAttr(S, D, AL);
     break;
   case ParsedAttr::AT_OpenCLNoSVM:
     handleOpenCLNoSVMAttr(S, D, AL);
     break;
   case ParsedAttr::AT_SwiftContext:
-    handleParameterABIAttr(S, D, AL, ParameterABI::SwiftContext);
+    S.AddParameterABIAttr(D, AL, ParameterABI::SwiftContext);
     break;
   case ParsedAttr::AT_SwiftErrorResult:
-    handleParameterABIAttr(S, D, AL, ParameterABI::SwiftErrorResult);
+    S.AddParameterABIAttr(D, AL, ParameterABI::SwiftErrorResult);
     break;
   case ParsedAttr::AT_SwiftIndirectResult:
-    handleParameterABIAttr(S, D, AL, ParameterABI::SwiftIndirectResult);
+    S.AddParameterABIAttr(D, AL, ParameterABI::SwiftIndirectResult);
     break;
   case ParsedAttr::AT_InternalLinkage:
     handleInternalLinkageAttr(S, D, AL);
     break;
   case ParsedAttr::AT_ExcludeFromExplicitInstantiation:
     handleSimpleAttribute<ExcludeFromExplicitInstantiationAttr>(S, D, AL);
     break;
   case ParsedAttr::AT_LTOVisibilityPublic:
NamedDecl * Sema::DeclClonePragmaWeak(NamedDecl *ND, IdentifierInfo *II,
   return NewD;
 }
 
 /// DeclApplyPragmaWeak - A declaration (maybe definition) needs \#pragma weak
 /// applied to it, possibly with an alias.
 void Sema::DeclApplyPragmaWeak(Scope *S, NamedDecl *ND, WeakInfo &W) {
   if (W.getUsed()) return; // only do this once
   W.setUsed(true);
+  AttributeCommonInfo Info(SourceRange(W.getLocation()),
+                           AttributeCommonInfo::AT_Weak,
+                           AttributeCommonInfo::AS_Pragma);
   if (W.getAlias()) { // clone decl, impersonate __attribute(weak,alias(...))
     IdentifierInfo *NDId = ND->getIdentifier();
     NamedDecl *NewD = DeclClonePragmaWeak(ND, W.getAlias(), W.getLocation());
-    NewD->addAttr(AliasAttr::CreateImplicit(Context, NDId->getName(),
-                                            W.getLocation()));
-    NewD->addAttr(WeakAttr::CreateImplicit(Context, W.getLocation()));
+    NewD->addAttr(
+        AliasAttr::CreateImplicit(Context, NDId->getName(), W.getLocation()));
+    NewD->addAttr(WeakAttr::CreateImplicit(Context, Info));
     WeakTopLevelDecl.push_back(NewD);
     // FIXME: "hideous" code from Sema::LazilyCreateBuiltin
     // to insert Decl at TU scope, sorry.
     DeclContext *SavedContext = CurContext;
     CurContext = Context.getTranslationUnitDecl();
     NewD->setDeclContext(CurContext);
     NewD->setLexicalDeclContext(CurContext);
     PushOnScopeChains(NewD, S);
     CurContext = SavedContext;
   } else { // just add weak to existing
-    ND->addAttr(WeakAttr::CreateImplicit(Context, W.getLocation()));
+    ND->addAttr(WeakAttr::CreateImplicit(Context, Info));
   }
 }
 
 void Sema::ProcessPragmaWeak(Scope *S, Decl *D) {
   // It's valid to "forward-declare" #pragma weak, in which case we
   // have to do this.
   LoadExternalWeakUndeclaredIdentifiers();
   if (!WeakUndeclaredIdentifiers.empty()) {

clang/lib/Sema/SemaDeclCXX.cpp

 #include "clang/AST/ComparisonCategories.h"
 #include "clang/AST/EvaluatedExprVisitor.h"
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/RecordLayout.h"
 #include "clang/AST/RecursiveASTVisitor.h"
 #include "clang/AST/StmtVisitor.h"
 #include "clang/AST/TypeLoc.h"
 #include "clang/AST/TypeOrdering.h"
+#include "clang/Basic/AttributeCommonInfo.h"
 #include "clang/Basic/PartialDiagnostic.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Lex/LiteralSupport.h"
 #include "clang/Lex/Preprocessor.h"
 #include "clang/Sema/CXXFieldCollector.h"
 #include "clang/Sema/DeclSpec.h"
 #include "clang/Sema/Initialization.h"
 #include "clang/Sema/Lookup.h"
Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange,
   // We do not support any C++11 attributes on base-specifiers yet.
   // Diagnose any attributes we see.
   for (const ParsedAttr &AL : Attributes) {
     if (AL.isInvalid() || AL.getKind() == ParsedAttr::IgnoredAttribute)
       continue;
     Diag(AL.getLoc(), AL.getKind() == ParsedAttr::UnknownAttribute
                           ? (unsigned)diag::warn_unknown_attribute_ignored
                           : (unsigned)diag::err_base_specifier_attribute)
-        << AL.getName();
+        << AL;
   }
 
   TypeSourceInfo *TInfo = nullptr;
   GetTypeFromParser(basetype, &TInfo);
 
   if (EllipsisLoc.isInvalid() &&
       DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo,
                                       UPPC_BaseType))
if (auto *DG = dyn_cast<CXXDeductionGuideDecl>(NonTemplateMember)) {
         }
         assert(LastAccessSpec && "differing access with no access specifier");
         Diag(LastAccessSpec->getBeginLoc(), diag::note_deduction_guide_access)
             << AS;
       }
     }
   }
 
-  if (VS.isOverrideSpecified())
-    Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context, 0));
-  if (VS.isFinalSpecified())
-    Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context,
-                                            VS.isFinalSpelledSealed()));
+  if (VS.isOverrideSpecified()) {
+    AttributeCommonInfo Info{SourceRange(VS.getOverrideLoc()),
+                             AttributeCommonInfo::UnknownAttribute,
+                             AttributeCommonInfo::AS_Keyword, 0};
+    Member->addAttr(new (Context) OverrideAttr(Context, Info));
+  }
+  if (VS.isFinalSpecified()) {
+    AttributeCommonInfo Info{
+        SourceRange(VS.getFinalLoc()), AttributeCommonInfo::UnknownAttribute,
+        AttributeCommonInfo::AS_Keyword, VS.isFinalSpelledSealed()};
+
+    Member->addAttr(new (Context) FinalAttr(Context, Info));
+  }
 
   if (VS.getLastLocation().isValid()) {
     // Update the end location of a method that has a virt-specifiers.
     if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member))
       MD->setRangeEnd(VS.getLastLocation());
   }
 
   CheckOverrideControl(Member);
if (!getDLLAttr(Member)) {
 
       // Do not export/import inline function when -fno-dllexport-inlines is
       // passed. But add attribute for later local static var check.
       if (!getLangOpts().DllExportInlines && MD && MD->isInlined() &&
           TSK != TSK_ExplicitInstantiationDeclaration &&
           TSK != TSK_ExplicitInstantiationDefinition) {
         if (ClassExported) {
           NewAttr = ::new (getASTContext())
-            DLLExportStaticLocalAttr(ClassAttr->getRange(),
-                                     getASTContext(),
-                                     ClassAttr->getSpellingListIndex());
+              DLLExportStaticLocalAttr(getASTContext(), *ClassAttr);
         } else {
           NewAttr = ::new (getASTContext())
-            DLLImportStaticLocalAttr(ClassAttr->getRange(),
-                                     getASTContext(),
-                                     ClassAttr->getSpellingListIndex());
+              DLLImportStaticLocalAttr(getASTContext(), *ClassAttr);
         }
       } else {
         NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext()));
       }
 
       NewAttr->setInherited(true);
       Member->addAttr(NewAttr);
 
if (!TagDecl)
     return;
 
   AdjustDeclIfTemplate(TagDecl);
 
   for (const ParsedAttr &AL : AttrList) {
     if (AL.getKind() != ParsedAttr::AT_Visibility)
       continue;
     AL.setInvalid();
-    Diag(AL.getLoc(), diag::warn_attribute_after_definition_ignored)
-        << AL.getName();
+    Diag(AL.getLoc(), diag::warn_attribute_after_definition_ignored) << AL;
   }
 
   ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef(
               // strict aliasing violation!
               reinterpret_cast<Decl**>(FieldCollector->getCurFields()),
               FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList);
 
   CheckCompletedCXXClass(cast<CXXRecordDecl>(TagDecl));

clang/lib/Sema/SemaDeclObjC.cpp

 /// @implementation (for a class or category).
 static void mergeInterfaceMethodToImpl(Sema &S,
                                        ObjCMethodDecl *method,
                                        ObjCMethodDecl *prevMethod) {
   // Merge the objc_requires_super attribute.
   if (prevMethod->hasAttr<ObjCRequiresSuperAttr>() &&
       !method->hasAttr<ObjCRequiresSuperAttr>()) {
     // merge the attribute into implementation.
-    method->addAttr(
-      ObjCRequiresSuperAttr::CreateImplicit(S.Context,
-                                            method->getLocation()));
+    method->addAttr(ObjCRequiresSuperAttr::CreateImplicit(
+        S.Context, method->getLocation()));
   }
 
   // Merge nullability of the result type.
   QualType newReturnType
     = mergeTypeNullabilityForRedecl(
         S, method->getReturnTypeSourceRange().getBegin(),
         method->getReturnType(),
         method->getObjCDeclQualifier() & Decl::OBJC_TQ_CSNullability,

clang/lib/Sema/SemaObjCProperty.cpp

GetterMethod = ObjCMethodDecl::Create(Context, Loc, Loc,
                               ObjCPropertyDecl::Optional) ?
                              ObjCMethodDecl::Optional :
                              ObjCMethodDecl::Required);
     CD->addDecl(GetterMethod);
 
     AddPropertyAttrs(*this, GetterMethod, property);
 
     if (property->hasAttr<NSReturnsNotRetainedAttr>())
-      GetterMethod->addAttr(NSReturnsNotRetainedAttr::CreateImplicit(Context,
-                                                                     Loc));
+      GetterMethod->addAttr(
+          NSReturnsNotRetainedAttr::CreateImplicit(Context, Loc));
 
     if (property->hasAttr<ObjCReturnsInnerPointerAttr>())
       GetterMethod->addAttr(
         ObjCReturnsInnerPointerAttr::CreateImplicit(Context, Loc));
 
-    if (const SectionAttr *SA = property->getAttr<SectionAttr>())
+    if (const SectionAttr *SA = property->getAttr<SectionAttr>()) {
+      AttributeCommonInfo Info(Loc, AttributeCommonInfo::AT_Section,
+                               AttributeCommonInfo::AS_GNU,
+                               SectionAttr::GNU_section);
       GetterMethod->addAttr(
-          SectionAttr::CreateImplicit(Context, SectionAttr::GNU_section,
-                                      SA->getName(), Loc));
+          SectionAttr::CreateImplicit(Context, SA->getName(), Info));
+    }
 
     if (getLangOpts().ObjCAutoRefCount)
       CheckARCMethodDecl(GetterMethod);
   } else
     // A user declared getter will be synthesize when @synthesize of
     // the property with the same name is seen in the @implementation
     GetterMethod->setPropertyAccessor(true);
   property->setGetterMethodDecl(GetterMethod);
if (!SetterMethod) {
                                                   /*TInfo=*/nullptr,
                                                   SC_None,
                                                   nullptr);
       SetterMethod->setMethodParams(Context, Argument, None);
 
       AddPropertyAttrs(*this, SetterMethod, property);
 
       CD->addDecl(SetterMethod);
-      if (const SectionAttr *SA = property->getAttr<SectionAttr>())
+      if (const SectionAttr *SA = property->getAttr<SectionAttr>()) {
+        AttributeCommonInfo Info(Loc, AttributeCommonInfo::AT_Section,
+                                 AttributeCommonInfo::AS_GNU,
+                                 SectionAttr::GNU_section);
         SetterMethod->addAttr(
-            SectionAttr::CreateImplicit(Context, SectionAttr::GNU_section,
-                                        SA->getName(), Loc));
+            SectionAttr::CreateImplicit(Context, SA->getName(), Info));
+      }
       // It's possible for the user to have set a very odd custom
       // setter selector that causes it to have a method family.
       if (getLangOpts().ObjCAutoRefCount)
         CheckARCMethodDecl(SetterMethod);
     } else
       // A user declared setter will be synthesize when @synthesize of
       // the property with the same name is seen in the @implementation
       SetterMethod->setPropertyAccessor(true);

clang/lib/Sema/SemaOpenMP.cpp

Sema::CapturedParamNameType Params[] = {
             Context.getPointerType(CopyFnType).withConst().withRestrict()),
         std::make_pair(".task_t.", Context.VoidPtrTy.withConst()),
         std::make_pair(StringRef(), QualType()) // __context with shared vars
     };
     ActOnCapturedRegionStart(DSAStack->getConstructLoc(), CurScope, CR_OpenMP,
                              Params, /*OpenMPCaptureLevel=*/0);
     // Mark this captured region as inlined, because we don't use outlined
     // function directly.
+    AttributeCommonInfo Info({}, AttributeCommonInfo::AT_AlwaysInline,
+                             AttributeCommonInfo::AS_Keyword,
+                             AlwaysInlineAttr::Keyword_forceinline);
     getCurCapturedRegion()->TheCapturedDecl->addAttr(
-        AlwaysInlineAttr::CreateImplicit(
-            Context, AlwaysInlineAttr::Keyword_forceinline));
+        AlwaysInlineAttr::CreateImplicit(Context, Info));
     Sema::CapturedParamNameType ParamsTarget[] = {
         std::make_pair(StringRef(), QualType()) // __context with shared vars
     };
     // Start a captured region for 'target' with no implicit parameters.
     ActOnCapturedRegionStart(DSAStack->getConstructLoc(), CurScope, CR_OpenMP,
                              ParamsTarget, /*OpenMPCaptureLevel=*/1);
     Sema::CapturedParamNameType ParamsTeamsOrParallel[] = {
         std::make_pair(".global_tid.", KmpInt32PtrTy),
Sema::CapturedParamNameType Params[] = {
             Context.getPointerType(CopyFnType).withConst().withRestrict()),
         std::make_pair(".task_t.", Context.VoidPtrTy.withConst()),
         std::make_pair(StringRef(), QualType()) // __context with shared vars
     };
     ActOnCapturedRegionStart(DSAStack->getConstructLoc(), CurScope, CR_OpenMP,
                              Params, /*OpenMPCaptureLevel=*/0);
     // Mark this captured region as inlined, because we don't use outlined
     // function directly.
+    AttributeCommonInfo Info({}, AttributeCommonInfo::AT_AlwaysInline,
+                             AttributeCommonInfo::AS_Keyword,
+                             AlwaysInlineAttr::Keyword_forceinline);
     getCurCapturedRegion()->TheCapturedDecl->addAttr(
-        AlwaysInlineAttr::CreateImplicit(
-            Context, AlwaysInlineAttr::Keyword_forceinline));
+        AlwaysInlineAttr::CreateImplicit(Context, Info));
     ActOnCapturedRegionStart(DSAStack->getConstructLoc(), CurScope, CR_OpenMP,
                              std::make_pair(StringRef(), QualType()),
                              /*OpenMPCaptureLevel=*/1);
     break;
   }
   case OMPD_simd:
   case OMPD_for:
   case OMPD_for_simd:
Sema::CapturedParamNameType Params[] = {
             Context.getPointerType(CopyFnType).withConst().withRestrict()),
         std::make_pair(".task_t.", Context.VoidPtrTy.withConst()),
         std::make_pair(StringRef(), QualType()) // __context with shared vars
     };
     ActOnCapturedRegionStart(DSAStack->getConstructLoc(), CurScope, CR_OpenMP,
                              Params);
     // Mark this captured region as inlined, because we don't use outlined
     // function directly.
+    AttributeCommonInfo Info({}, AttributeCommonInfo::AT_AlwaysInline,
+                             AttributeCommonInfo::AS_Keyword,
+                             AlwaysInlineAttr::Keyword_forceinline);
     getCurCapturedRegion()->TheCapturedDecl->addAttr(
-        AlwaysInlineAttr::CreateImplicit(
-            Context, AlwaysInlineAttr::Keyword_forceinline));
+        AlwaysInlineAttr::CreateImplicit(Context, Info));
     break;
   }
   case OMPD_taskloop:
   case OMPD_taskloop_simd: {
     QualType KmpInt32Ty =
         Context.getIntTypeForBitwidth(/*DestWidth=*/32, /*Signed=*/1)
             .withConst();
     QualType KmpUInt64Ty =
Sema::CapturedParamNameType Params[] = {
         std::make_pair(".liter.", KmpInt32Ty),
         std::make_pair(".reductions.", VoidPtrTy),
         std::make_pair(StringRef(), QualType()) // __context with shared vars
     };
     ActOnCapturedRegionStart(DSAStack->getConstructLoc(), CurScope, CR_OpenMP,
                              Params);
     // Mark this captured region as inlined, because we don't use outlined
     // function directly.
+    AttributeCommonInfo Info({}, AttributeCommonInfo::AT_AlwaysInline,
+                             AttributeCommonInfo::AS_Keyword,
+                             AlwaysInlineAttr::Keyword_forceinline);
     getCurCapturedRegion()->TheCapturedDecl->addAttr(
-        AlwaysInlineAttr::CreateImplicit(
-            Context, AlwaysInlineAttr::Keyword_forceinline));
+        AlwaysInlineAttr::CreateImplicit(Context, Info));
     break;
   }
   case OMPD_distribute_parallel_for_simd:
   case OMPD_distribute_parallel_for: {
     QualType KmpInt32Ty = Context.getIntTypeForBitwidth(32, 1).withConst();
     QualType KmpInt32PtrTy =
         Context.getPointerType(KmpInt32Ty).withConst().withRestrict();
     Sema::CapturedParamNameType Params[] = {
Sema::CapturedParamNameType Params[] = {
             Context.getPointerType(CopyFnType).withConst().withRestrict()),
         std::make_pair(".task_t.", Context.VoidPtrTy.withConst()),
         std::make_pair(StringRef(), QualType()) // __context with shared vars
     };
     ActOnCapturedRegionStart(DSAStack->getConstructLoc(), CurScope, CR_OpenMP,
                              Params, /*OpenMPCaptureLevel=*/0);
     // Mark this captured region as inlined, because we don't use outlined
     // function directly.
+    AttributeCommonInfo Info({}, AttributeCommonInfo::AT_AlwaysInline,
+                             AttributeCommonInfo::AS_Keyword,
+                             AlwaysInlineAttr::Keyword_forceinline);
     getCurCapturedRegion()->TheCapturedDecl->addAttr(
-        AlwaysInlineAttr::CreateImplicit(
-            Context, AlwaysInlineAttr::Keyword_forceinline));
+        AlwaysInlineAttr::CreateImplicit(Context, Info));
     Sema::CapturedParamNameType ParamsTarget[] = {
         std::make_pair(StringRef(), QualType()) // __context with shared vars
     };
     // Start a captured region for 'target' with no implicit parameters.
     ActOnCapturedRegionStart(DSAStack->getConstructLoc(), CurScope, CR_OpenMP,
                              ParamsTarget, /*OpenMPCaptureLevel=*/1);
 
     Sema::CapturedParamNameType ParamsTeams[] = {
Sema::CapturedParamNameType Params[] = {
             Context.getPointerType(CopyFnType).withConst().withRestrict()),
         std::make_pair(".task_t.", Context.VoidPtrTy.withConst()),
         std::make_pair(StringRef(), QualType()) // __context with shared vars
     };
     ActOnCapturedRegionStart(DSAStack->getConstructLoc(), CurScope, CR_OpenMP,
                              Params);
     // Mark this captured region as inlined, because we don't use outlined
     // function directly.
+    AttributeCommonInfo Info({}, AttributeCommonInfo::AT_AlwaysInline,
+                             AttributeCommonInfo::AS_Keyword,
+                             AlwaysInlineAttr::Keyword_forceinline);
     getCurCapturedRegion()->TheCapturedDecl->addAttr(
-        AlwaysInlineAttr::CreateImplicit(
-            Context, AlwaysInlineAttr::Keyword_forceinline));
+        AlwaysInlineAttr::CreateImplicit(Context, Info));
     break;
   }
   case OMPD_threadprivate:
   case OMPD_allocate:
   case OMPD_taskyield:
   case OMPD_barrier:
   case OMPD_taskwait:
   case OMPD_cancellation_point:

clang/lib/Sema/SemaStmtAttr.cpp

 #include "clang/Sema/ScopeInfo.h"
 #include "llvm/ADT/StringExtras.h"
 
 using namespace clang;
 using namespace sema;
 
 static Attr *handleFallThroughAttr(Sema &S, Stmt *St, const ParsedAttr &A,
                                    SourceRange Range) {
-  FallThroughAttr Attr(A.getRange(), S.Context,
-                       A.getAttributeSpellingListIndex());
+  FallThroughAttr Attr(S.Context, A);
   if (!isa<NullStmt>(St)) {
     S.Diag(A.getRange().getBegin(), diag::err_fallthrough_attr_wrong_target)
         << Attr.getSpelling() << St->getBeginLoc();
     if (isa<SwitchCase>(St)) {
       SourceLocation L = S.getLocForEndOfToken(Range.getEnd());
       S.Diag(L, diag::note_fallthrough_insert_semi_fixit)
           << FixItHint::CreateInsertion(L, ";");
     }
     return nullptr;
   }
   auto *FnScope = S.getCurFunction();
   if (FnScope->SwitchStack.empty()) {
     S.Diag(A.getRange().getBegin(), diag::err_fallthrough_attr_outside_switch);
     return nullptr;
   }
 
   // If this is spelled as the standard C++17 attribute, but not in C++17, warn
   // about using it as an extension.
   if (!S.getLangOpts().CPlusPlus17 && A.isCXX11Attribute() &&
       !A.getScopeName())
-    S.Diag(A.getLoc(), diag::ext_cxx17_attr) << A.getName();
+    S.Diag(A.getLoc(), diag::ext_cxx17_attr) << A;
 
   FnScope->setHasFallthroughStmt();
-  return ::new (S.Context) auto(Attr);
+  return ::new (S.Context) FallThroughAttr(S.Context, A);
 }
 
 static Attr *handleSuppressAttr(Sema &S, Stmt *St, const ParsedAttr &A,
                                 SourceRange Range) {
   if (A.getNumArgs() < 1) {
     S.Diag(A.getLoc(), diag::err_attribute_too_few_arguments) << A << 1;
     return nullptr;
   }
 
   std::vector<StringRef> DiagnosticIdentifiers;
   for (unsigned I = 0, E = A.getNumArgs(); I != E; ++I) {
     StringRef RuleName;
 
     if (!S.checkStringLiteralArgumentAttr(A, I, RuleName, nullptr))
       return nullptr;
 
     // FIXME: Warn if the rule name is unknown. This is tricky because only
     // clang-tidy knows about available rules.
     DiagnosticIdentifiers.push_back(RuleName);
   }
 
   return ::new (S.Context) SuppressAttr(
-      A.getRange(), S.Context, DiagnosticIdentifiers.data(),
-      DiagnosticIdentifiers.size(), A.getAttributeSpellingListIndex());
+      S.Context, A, DiagnosticIdentifiers.data(), DiagnosticIdentifiers.size());
 }
 
 static Attr *handleLoopHintAttr(Sema &S, Stmt *St, const ParsedAttr &A,
                                 SourceRange) {
   IdentifierLoc *PragmaNameLoc = A.getArgAsIdent(0);
   IdentifierLoc *OptionLoc = A.getArgAsIdent(1);
   IdentifierLoc *StateLoc = A.getArgAsIdent(2);
   Expr *ValueExpr = A.getArgAsExpr(3);
 
   StringRef PragmaName =
       llvm::StringSwitch<StringRef>(PragmaNameLoc->Ident->getName())
           .Cases("unroll", "nounroll", "unroll_and_jam", "nounroll_and_jam",
                  PragmaNameLoc->Ident->getName())
           .Default("clang loop");
 
   if (St->getStmtClass() != Stmt::DoStmtClass &&
       St->getStmtClass() != Stmt::ForStmtClass &&
       St->getStmtClass() != Stmt::CXXForRangeStmtClass &&
       St->getStmtClass() != Stmt::WhileStmtClass) {
     std::string Pragma = "#pragma " + std::string(PragmaName);
     S.Diag(St->getBeginLoc(), diag::err_pragma_loop_precedes_nonloop) << Pragma;
     return nullptr;
   }
 
-  LoopHintAttr::Spelling Spelling =
-      LoopHintAttr::Spelling(A.getAttributeSpellingListIndex());
   LoopHintAttr::OptionType Option;
   LoopHintAttr::LoopHintState State;
 
   auto SetHints = [&Option, &State](LoopHintAttr::OptionType O,
                                     LoopHintAttr::LoopHintState S) {
     Option = O;
     State = S;
   };
if (Option == LoopHintAttr::VectorizeWidth ||
       else if (StateLoc->Ident->isStr("enable"))
         State = LoopHintAttr::Enable;
       else
         llvm_unreachable("bad loop hint argument");
     } else
       llvm_unreachable("bad loop hint");
   }
 
-  return LoopHintAttr::CreateImplicit(S.Context, Spelling, Option, State,
-                                      ValueExpr, A.getRange());
+  return LoopHintAttr::CreateImplicit(S.Context, Option, State, ValueExpr, A);
 }
 
 static void
 CheckForIncompatibleAttributes(Sema &S,
                                const SmallVectorImpl<const Attr *> &Attrs) {
   // There are 6 categories of loop hints attributes: vectorize, interleave,
   // unroll, unroll_and_jam, pipeline and distribute. Except for distribute they
   // come in two variants: a state form and a numeric form.  The state form

 
 static Attr *ProcessStmtAttribute(Sema &S, Stmt *St, const ParsedAttr &A,
                                   SourceRange Range) {
   switch (A.getKind()) {
   case ParsedAttr::UnknownAttribute:
     S.Diag(A.getLoc(), A.isDeclspecAttribute()
                            ? (unsigned)diag::warn_unhandled_ms_attribute_ignored
                            : (unsigned)diag::warn_unknown_attribute_ignored)
-        << A.getName();
+        << A;
     return nullptr;
   case ParsedAttr::AT_FallThrough:
     return handleFallThroughAttr(S, St, A, Range);
   case ParsedAttr::AT_LoopHint:
     return handleLoopHintAttr(S, St, A, Range);
   case ParsedAttr::AT_OpenCLUnrollHint:
     return handleOpenCLUnrollHint(S, St, A, Range);
   case ParsedAttr::AT_Suppress:
     return handleSuppressAttr(S, St, A, Range);
   default:
     // if we're here, then we parsed a known attribute, but didn't recognize
     // it as a statement attribute => it is declaration attribute
     S.Diag(A.getRange().getBegin(), diag::err_decl_attribute_invalid_on_stmt)
-        << A.getName() << St->getBeginLoc();
+        << A << St->getBeginLoc();
     return nullptr;
   }
 }
 
 StmtResult Sema::ProcessStmtAttributes(Stmt *S,
                                        const ParsedAttributesView &AttrList,
                                        SourceRange Range) {
   SmallVector<const Attr*, 8> Attrs;

clang/lib/Sema/SemaTemplateInstantiate.cpp

if (TransformedExpr == LH->getValue())
     return LH;
 
   // Generate error if there is a problem with the value.
   if (getSema().CheckLoopHintExpr(TransformedExpr, LH->getLocation()))
     return LH;
 
   // Create new LoopHintValueAttr with integral expression in place of the
   // non-type template parameter.
-  return LoopHintAttr::CreateImplicit(
-      getSema().Context, LH->getSemanticSpelling(), LH->getOption(),
-      LH->getState(), TransformedExpr, LH->getRange());
+  return LoopHintAttr::CreateImplicit(getSema().Context, LH->getOption(),
+                                      LH->getState(), TransformedExpr, *LH);
 }
 
 ExprResult TemplateInstantiator::transformNonTypeTemplateParmRef(
                                                  NonTypeTemplateParmDecl *parm,
                                                  SourceLocation loc,
                                                  TemplateArgument arg) {
   ExprResult result;
   QualType type;

clang/lib/Sema/SemaTemplateInstantiateDecl.cpp

static void instantiateDependentAlignedAttr(
     Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
     const AlignedAttr *Aligned, Decl *New, bool IsPackExpansion) {
   if (Aligned->isAlignmentExpr()) {
     // The alignment expression is a constant expression.
     EnterExpressionEvaluationContext Unevaluated(
         S, Sema::ExpressionEvaluationContext::ConstantEvaluated);
     ExprResult Result = S.SubstExpr(Aligned->getAlignmentExpr(), TemplateArgs);
     if (!Result.isInvalid())
-      S.AddAlignedAttr(Aligned->getLocation(), New, Result.getAs<Expr>(),
-                       Aligned->getSpellingListIndex(), IsPackExpansion);
+      S.AddAlignedAttr(New, *Aligned, Result.getAs<Expr>(), IsPackExpansion);
   } else {
     TypeSourceInfo *Result = S.SubstType(Aligned->getAlignmentType(),
                                          TemplateArgs, Aligned->getLocation(),
                                          DeclarationName());
     if (Result)
-      S.AddAlignedAttr(Aligned->getLocation(), New, Result,
-                       Aligned->getSpellingListIndex(), IsPackExpansion);
+      S.AddAlignedAttr(New, *Aligned, Result, IsPackExpansion);
   }
 }
 
 static void instantiateDependentAlignedAttr(
     Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
     const AlignedAttr *Aligned, Decl *New) {
   if (!Aligned->isPackExpansion()) {
     instantiateDependentAlignedAttr(S, TemplateArgs, Aligned, New, false);
static void instantiateDependentAssumeAlignedAttr(
 
   if (Aligned->getOffset()) {
     Result = S.SubstExpr(Aligned->getOffset(), TemplateArgs);
     if (Result.isInvalid())
       return;
     OE = Result.getAs<Expr>();
   }
 
-  S.AddAssumeAlignedAttr(Aligned->getLocation(), New, E, OE,
-                         Aligned->getSpellingListIndex());
+  S.AddAssumeAlignedAttr(New, *Aligned, E, OE);
 }
 
 static void instantiateDependentAlignValueAttr(
     Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
     const AlignValueAttr *Aligned, Decl *New) {
   // The alignment expression is a constant expression.
   EnterExpressionEvaluationContext Unevaluated(
       S, Sema::ExpressionEvaluationContext::ConstantEvaluated);
   ExprResult Result = S.SubstExpr(Aligned->getAlignment(), TemplateArgs);
   if (!Result.isInvalid())
-    S.AddAlignValueAttr(Aligned->getLocation(), New, Result.getAs<Expr>(),
-                        Aligned->getSpellingListIndex());
+    S.AddAlignValueAttr(New, *Aligned, Result.getAs<Expr>());
 }
 
 static void instantiateDependentAllocAlignAttr(
     Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
     const AllocAlignAttr *Align, Decl *New) {
   Expr *Param = IntegerLiteral::Create(
       S.getASTContext(),
       llvm::APInt(64, Align->getParamIndex().getSourceIndex()),
       S.getASTContext().UnsignedLongLongTy, Align->getLocation());
-  S.AddAllocAlignAttr(Align->getLocation(), New, Param,
-                      Align->getSpellingListIndex());
+  S.AddAllocAlignAttr(New, *Align, Param);
 }
 
 static Expr *instantiateDependentFunctionAttrCondition(
     Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
     const Attr *A, Expr *OldCond, const Decl *Tmpl, FunctionDecl *New) {
   Expr *Cond = nullptr;
   {
     Sema::ContextRAII SwitchContext(S, New);

 
 static void instantiateDependentEnableIfAttr(
     Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
     const EnableIfAttr *EIA, const Decl *Tmpl, FunctionDecl *New) {
   Expr *Cond = instantiateDependentFunctionAttrCondition(
       S, TemplateArgs, EIA, EIA->getCond(), Tmpl, New);
 
   if (Cond)
-    New->addAttr(new (S.getASTContext()) EnableIfAttr(
-        EIA->getLocation(), S.getASTContext(), Cond, EIA->getMessage(),
-        EIA->getSpellingListIndex()));
+    New->addAttr(new (S.getASTContext()) EnableIfAttr(S.getASTContext(), *EIA,
+                                                      Cond, EIA->getMessage()));
 }
 
 static void instantiateDependentDiagnoseIfAttr(
     Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
     const DiagnoseIfAttr *DIA, const Decl *Tmpl, FunctionDecl *New) {
   Expr *Cond = instantiateDependentFunctionAttrCondition(
       S, TemplateArgs, DIA, DIA->getCond(), Tmpl, New);
 
   if (Cond)
     New->addAttr(new (S.getASTContext()) DiagnoseIfAttr(
-        DIA->getLocation(), S.getASTContext(), Cond, DIA->getMessage(),
-        DIA->getDiagnosticType(), DIA->getArgDependent(), New,
-        DIA->getSpellingListIndex()));
+        S.getASTContext(), *DIA, Cond, DIA->getMessage(),
+        DIA->getDiagnosticType(), DIA->getArgDependent(), New));
 }
 
 // Constructs and adds to New a new instance of CUDALaunchBoundsAttr using
 // template A as the base and arguments from TemplateArgs.
 static void instantiateDependentCUDALaunchBoundsAttr(
     Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
     const CUDALaunchBoundsAttr &Attr, Decl *New) {
   // The alignment expression is a constant expression.
   EnterExpressionEvaluationContext Unevaluated(
       S, Sema::ExpressionEvaluationContext::ConstantEvaluated);
 
   ExprResult Result = S.SubstExpr(Attr.getMaxThreads(), TemplateArgs);
   if (Result.isInvalid())
     return;
   Expr *MaxThreads = Result.getAs<Expr>();
 
   Expr *MinBlocks = nullptr;
   if (Attr.getMinBlocks()) {
     Result = S.SubstExpr(Attr.getMinBlocks(), TemplateArgs);
     if (Result.isInvalid())
       return;
     MinBlocks = Result.getAs<Expr>();
   }
 
-  S.AddLaunchBoundsAttr(Attr.getLocation(), New, MaxThreads, MinBlocks,
-                        Attr.getSpellingListIndex());
+  S.AddLaunchBoundsAttr(New, Attr, MaxThreads, MinBlocks);
 }
 
 static void
 instantiateDependentModeAttr(Sema &S,
                              const MultiLevelTemplateArgumentList &TemplateArgs,
                              const ModeAttr &Attr, Decl *New) {
-  S.AddModeAttr(Attr.getRange(), New, Attr.getMode(),
-                Attr.getSpellingListIndex(), /*InInstantiation=*/true);
+  S.AddModeAttr(New, Attr, Attr.getMode(),
+                /*InInstantiation=*/true);
 }
 
 /// Instantiation of 'declare simd' attribute and its arguments.
 static void instantiateOMPDeclareSimdDeclAttr(
     Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
     const OMPDeclareSimdDeclAttr &Attr, Decl *New) {
   // Allow 'this' in clauses with varlists.
   if (auto *FTD = dyn_cast<FunctionTemplateDecl>(New))
if (Result.isInvalid())
     return;
   Expr *MinExpr = Result.getAs<Expr>();
 
   Result = S.SubstExpr(Attr.getMax(), TemplateArgs);
   if (Result.isInvalid())
     return;
   Expr *MaxExpr = Result.getAs<Expr>();
 
-  S.addAMDGPUFlatWorkGroupSizeAttr(Attr.getLocation(), New, MinExpr, MaxExpr,
-                                   Attr.getSpellingListIndex());
+  S.addAMDGPUFlatWorkGroupSizeAttr(New, Attr, MinExpr, MaxExpr);
 }
 
 static ExplicitSpecifier
 instantiateExplicitSpecifier(Sema &S,
                              const MultiLevelTemplateArgumentList &TemplateArgs,
                              ExplicitSpecifier ES, FunctionDecl *New) {
   if (!ES.getExpr())
     return ES;
static void instantiateDependentAMDGPUWavesPerEUAttr(
   Expr *MaxExpr = nullptr;
   if (auto Max = Attr.getMax()) {
     Result = S.SubstExpr(Max, TemplateArgs);
     if (Result.isInvalid())
       return;
     MaxExpr = Result.getAs<Expr>();
   }
 
-  S.addAMDGPUWavesPerEUAttr(Attr.getLocation(), New, MinExpr, MaxExpr,
-                            Attr.getSpellingListIndex());
+  S.addAMDGPUWavesPerEUAttr(New, Attr, MinExpr, MaxExpr);
 }
 
 void Sema::InstantiateAttrsForDecl(
     const MultiLevelTemplateArgumentList &TemplateArgs, const Decl *Tmpl,
     Decl *New, LateInstantiatedAttrVec *LateAttrs,
     LocalInstantiationScope *OuterMostScope) {
   if (NamedDecl *ND = dyn_cast<NamedDecl>(New)) {
     for (const auto *TmplAttr : Tmpl->attrs()) {
for (const auto *TmplAttr : Tmpl->attrs()) {
     if (TmplAttr->getKind() == attr::DLLExport ||
         TmplAttr->getKind() == attr::DLLImport) {
       if (New->hasAttr<DLLExportAttr>() || New->hasAttr<DLLImportAttr>()) {
         continue;
       }
     }
 
     if (const auto *ABIAttr = dyn_cast<ParameterABIAttr>(TmplAttr)) {
-      AddParameterABIAttr(ABIAttr->getRange(), New, ABIAttr->getABI(),
-                          ABIAttr->getSpellingListIndex());
+      AddParameterABIAttr(New, *ABIAttr, ABIAttr->getABI());
       continue;
     }
 
     if (isa<NSConsumedAttr>(TmplAttr) || isa<OSConsumedAttr>(TmplAttr) ||
         isa<CFConsumedAttr>(TmplAttr)) {
-      AddXConsumedAttr(New, TmplAttr->getRange(),
-                       TmplAttr->getSpellingListIndex(),
-                       attrToRetainOwnershipKind(TmplAttr),
+      AddXConsumedAttr(New, *TmplAttr, attrToRetainOwnershipKind(TmplAttr),
                        /*template instantiation=*/true);
       continue;
     }
 
     if (auto *A = dyn_cast<PointerAttr>(TmplAttr)) {
       if (!New->hasAttr<PointerAttr>())
         New->addAttr(A->clone(Context));
       continue;

clang/lib/Sema/SemaType.cpp

static void diagnoseBadTypeAttribute(Sema &S, const ParsedAttr &attr,
   default:
     // Assume everything else was a function attribute.
     WhichType = TDS_Function;
     useExpansionLoc = false;
     break;
   }
 
   SourceLocation loc = attr.getLoc();
-  StringRef name = attr.getName()->getName();
+  StringRef name = attr.getAttrName()->getName();
 
   // The GC attributes are usually written with macros;  special-case them.
   IdentifierInfo *II = attr.isArgIdent(0) ? attr.getArgAsIdent(0)->Ident
                                           : nullptr;
   if (useExpansionLoc && loc.isMacroID() && II) {
     if (II->isStr("strong")) {
       if (S.findMacroSpelling(loc, "__strong")) name = "__strong";
     } else if (II->isStr("weak")) {
static bool checkOmittedBlockReturnType(Sema &S, Declarator &declarator,
 
   // Warn if we see type attributes for omitted return type on a block literal.
   SmallVector<ParsedAttr *, 2> ToBeRemoved;
   for (ParsedAttr &AL : declarator.getMutableDeclSpec().getAttributes()) {
     if (AL.isInvalid() || !AL.isTypeAttr())
       continue;
     S.Diag(AL.getLoc(),
            diag::warn_block_literal_attributes_on_omitted_return_type)
-        << AL.getName();
+        << AL;
     ToBeRemoved.push_back(&AL);
   }
   // Remove bad attributes from the list.
   for (ParsedAttr *AL : ToBeRemoved)
     declarator.getMutableDeclSpec().getAttributes().remove(AL);
 
   // Warn if we see type qualifiers for omitted return type on a block literal.
   const DeclSpec &DS = declarator.getDeclSpec();

 static bool IsNoDerefableChunk(DeclaratorChunk Chunk) {
   return (Chunk.Kind == DeclaratorChunk::Pointer ||
           Chunk.Kind == DeclaratorChunk::Array);
 }
 
 template<typename AttrT>
 static AttrT *createSimpleAttr(ASTContext &Ctx, ParsedAttr &Attr) {
   Attr.setUsedAsTypeAttr();
-  return ::new (Ctx)
-      AttrT(Attr.getRange(), Ctx, Attr.getAttributeSpellingListIndex());
+  return ::new (Ctx) AttrT(Ctx, Attr);
 }
 
 static Attr *createNullabilityAttr(ASTContext &Ctx, ParsedAttr &Attr,
                                    NullabilityKind NK) {
   switch (NK) {
   case NullabilityKind::NonNull:
     return createSimpleAttr<TypeNonNullAttr>(Ctx, Attr);
 
if (Attr.getKind() == ParsedAttr::AT_AddressSpace) {
 
     LangAS ASIdx;
     if (!BuildAddressSpaceIndex(S, ASIdx, ASArgExpr, Attr.getLoc())) {
       Attr.setInvalid();
       return;
     }
 
     ASTContext &Ctx = S.Context;
-    auto *ASAttr = ::new (Ctx)
-        AddressSpaceAttr(Attr.getRange(), Ctx, static_cast<unsigned>(ASIdx),
-                         Attr.getAttributeSpellingListIndex());
+    auto *ASAttr =
+        ::new (Ctx) AddressSpaceAttr(Ctx, Attr, static_cast<unsigned>(ASIdx));
 
     // If the expression is not value dependent (not templated), then we can
     // apply the address space qualifiers just to the equivalent type.
     // Otherwise, we make an AttributedType with the modified and equivalent
     // type the same, and wrap it in a DependentAddressSpaceType. When this
     // dependent type is resolved, the qualifier is added to the equivalent type
     // later.
     QualType T;
if (II->isStr("none"))
     lifetime = Qualifiers::OCL_ExplicitNone;
   else if (II->isStr("strong"))
     lifetime = Qualifiers::OCL_Strong;
   else if (II->isStr("weak"))
     lifetime = Qualifiers::OCL_Weak;
   else if (II->isStr("autoreleasing"))
     lifetime = Qualifiers::OCL_Autoreleasing;
   else {
-    S.Diag(AttrLoc, diag::warn_attribute_type_not_supported)
-      << attr.getName() << II;
+    S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) << attr << II;
     attr.setInvalid();
     return true;
   }
 
   // Just ignore lifetime attributes other than __weak and __unsafe_unretained
   // outside of ARC mode.
   if (!S.getLangOpts().ObjCAutoRefCount &&
       lifetime != Qualifiers::OCL_Weak &&
if (previousLifetime != lifetime) {
       }
       underlyingType.Quals.removeObjCLifetime();
     }
   }
 
   underlyingType.Quals.addObjCLifetime(lifetime);
 
   if (NonObjCPointer) {
-    StringRef name = attr.getName()->getName();
+    StringRef name = attr.getAttrName()->getName();
     switch (lifetime) {
     case Qualifiers::OCL_None:
     case Qualifiers::OCL_ExplicitNone:
       break;
     case Qualifiers::OCL_Strong: name = "__strong"; break;
     case Qualifiers::OCL_Weak: name = "__weak"; break;
     case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break;
     }
static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
 
   QualType origType = type;
   if (!NonObjCPointer)
     type = S.Context.getQualifiedType(underlyingType);
 
   // If we have a valid source location for the attribute, use an
   // AttributedType instead.
   if (AttrLoc.isValid()) {
-    type = state.getAttributedType(::new (S.Context) ObjCOwnershipAttr(
-                                       attr.getRange(), S.Context, II,
-                                       attr.getAttributeSpellingListIndex()),
+    type = state.getAttributedType(::new (S.Context)
+                                       ObjCOwnershipAttr(S.Context, attr, II),
                                    origType, type);
   }
 
   auto diagnoseOrDelay = [](Sema &S, SourceLocation loc,
                             unsigned diagnostic, QualType type) {
     if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
       S.DelayedDiagnostics.add(
           sema::DelayedDiagnostic::makeForbiddenType(
static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
 
   IdentifierInfo *II = attr.getArgAsIdent(0)->Ident;
   if (II->isStr("weak"))
     GCAttr = Qualifiers::Weak;
   else if (II->isStr("strong"))
     GCAttr = Qualifiers::Strong;
   else {
     S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported)
-      << attr.getName() << II;
+        << attr << II;
     attr.setInvalid();
     return true;
   }
 
   QualType origType = type;
   type = S.Context.getObjCGCQualType(origType, GCAttr);
 
   // Make an attributed type to preserve the source information.
   if (attr.getLoc().isValid())
     type = state.getAttributedType(
-        ::new (S.Context) ObjCGCAttr(attr.getRange(), S.Context, II,
-                                     attr.getAttributeSpellingListIndex()),
-        origType, type);
+        ::new (S.Context) ObjCGCAttr(S.Context, attr, II), origType, type);
 
   return true;
 }
 
 namespace {
   /// A helper class to unwrap a type down to a function for the
   /// purposes of applying attributes there.
   ///
static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &State,
   QualType Desugared = Type;
   const AttributedType *AT = dyn_cast<AttributedType>(Type);
   while (AT) {
     attr::Kind CurAttrKind = AT->getAttrKind();
 
     // You cannot specify duplicate type attributes, so if the attribute has
     // already been applied, flag it.
     if (NewAttrKind == CurAttrKind) {
-      S.Diag(PAttr.getLoc(), diag::warn_duplicate_attribute_exact)
-        << PAttr.getName();
+      S.Diag(PAttr.getLoc(), diag::warn_duplicate_attribute_exact) << PAttr;
       return true;
     }
 
     // You cannot have both __sptr and __uptr on the same type, nor can you
     // have __ptr32 and __ptr64.
     if ((CurAttrKind == attr::Ptr32 && NewAttrKind == attr::Ptr64) ||
         (CurAttrKind == attr::Ptr64 && NewAttrKind == attr::Ptr32)) {
       S.Diag(PAttr.getLoc(), diag::err_attributes_are_not_compatible)
auto diag = state.getSema().Diag(attr.getLoc(),
                              attr.isContextSensitiveKeywordAttribute())
       << type
       << static_cast<unsigned>(pointerKind);
 
     // FIXME: MemberPointer chunks don't carry the location of the *.
     if (chunk.Kind != DeclaratorChunk::MemberPointer) {
       diag << FixItHint::CreateRemoval(attr.getLoc())
            << FixItHint::CreateInsertion(
-                state.getSema().getPreprocessor()
-                  .getLocForEndOfToken(chunk.Loc),
-                " " + attr.getName()->getName().str() + " ");
+                  state.getSema().getPreprocessor().getLocForEndOfToken(
+                      chunk.Loc),
+                  " " + attr.getAttrName()->getName().str() + " ");
     }
 
     moveAttrFromListToList(attr, state.getCurrentAttributes(),
                            chunk.getAttrs());
     return true;
   };
 
   // Move it to the outermost pointer, member pointer, or block
case ParsedAttr::AT_Pcs: {
     StringRef Str;
     if (Attr.isArgExpr(0))
       Str = cast<StringLiteral>(Attr.getArgAsExpr(0))->getString();
     else
       Str = Attr.getArgAsIdent(0)->Ident->getName();
     PcsAttr::PCSType Type;
     if (!PcsAttr::ConvertStrToPCSType(Str, Type))
       llvm_unreachable("already validated the attribute");
-    return ::new (Ctx) PcsAttr(Attr.getRange(), Ctx, Type,
-                               Attr.getAttributeSpellingListIndex());
+    return ::new (Ctx) PcsAttr(Ctx, Attr, Type);
   }
   case ParsedAttr::AT_IntelOclBicc:
     return createSimpleAttr<IntelOclBiccAttr>(Ctx, Attr);
   case ParsedAttr::AT_MSABI:
     return createSimpleAttr<MSABIAttr>(Ctx, Attr);
   case ParsedAttr::AT_SysVABI:
     return createSimpleAttr<SysVABIAttr>(Ctx, Attr);
   case ParsedAttr::AT_PreserveMost:
if (BaseTy->isPipeType()) {
         break;
         #include "clang/Basic/OpenCLImageTypes.def"
       default:
         llvm_unreachable("Unable to find corresponding image type.");
       }
     } else {
       llvm_unreachable("unexpected type");
     }
-    StringRef AttrName = Attr.getName()->getName();
+    StringRef AttrName = Attr.getAttrName()->getName();
     if (PrevAccessQual == AttrName.ltrim("_")) {
       // Duplicated qualifiers
       S.Diag(Attr.getLoc(), diag::warn_duplicate_declspec)
          << AttrName << Attr.getRange();
     } else {
       // Contradicting qualifiers
       S.Diag(Attr.getLoc(), diag::err_opencl_multiple_access_qualifiers);
     }
if (attr.isCXX11Attribute()) {
       // incompatibility.
       if (attr.isGNUScope()) {
         bool IsTypeAttr = attr.isTypeAttr();
         if (TAL == TAL_DeclChunk) {
           state.getSema().Diag(attr.getLoc(),
                                IsTypeAttr
                                    ? diag::warn_gcc_ignores_type_attr
                                    : diag::warn_cxx11_gnu_attribute_on_type)
-              << attr.getName();
+              << attr;
           if (!IsTypeAttr)
             continue;
         }
       } else if (TAL != TAL_DeclChunk &&
                  attr.getKind() != ParsedAttr::AT_AddressSpace) {
         // Otherwise, only consider type processing for a C++11 attribute if
         // it's actually been applied to a type.
         // We also allow C++11 address_space attributes to pass through.
default:
         attr.setUsedAsTypeAttr();
       }
       break;
 
     case ParsedAttr::UnknownAttribute:
       if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk)
         state.getSema().Diag(attr.getLoc(),
                              diag::warn_unknown_attribute_ignored)
-          << attr.getName();
+            << attr;
       break;
 
     case ParsedAttr::IgnoredAttribute:
       break;
 
     case ParsedAttr::AT_MayAlias:
       // FIXME: This attribute needs to actually be handled, but if we ignore
       // it it breaks large amounts of Linux software.
if (!RD->hasAttr<MSInheritanceAttr>()) {
     case LangOptions::PPTMK_FullGeneralityMultipleInheritance:
       IM = MSInheritanceAttr::Keyword_multiple_inheritance;
       break;
     case LangOptions::PPTMK_FullGeneralityVirtualInheritance:
       IM = MSInheritanceAttr::Keyword_unspecified_inheritance;
       break;
     }
 
+    AttributeCommonInfo Info{S.ImplicitMSInheritanceAttrLoc.isValid()
+                                 ? S.ImplicitMSInheritanceAttrLoc
+                                 : RD->getSourceRange(),
+                             AttributeCommonInfo::AT_MSInheritance,
+                             AttributeCommonInfo::AS_Microsoft, IM};
     RD->addAttr(MSInheritanceAttr::CreateImplicit(
-        S.getASTContext(), IM,
+        S.getASTContext(),
         /*BestCase=*/S.MSPointerToMemberRepresentationMethod ==
             LangOptions::PPTMK_BestCase,
-        S.ImplicitMSInheritanceAttrLoc.isValid()
-            ? S.ImplicitMSInheritanceAttrLoc
-            : RD->getSourceRange()));
+        Info));
     S.Consumer.AssignInheritanceModel(RD);
   }
 }
 
 /// The implementation of RequireCompleteType
 bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T,
                                    TypeDiagnoser *Diagnoser) {
   // FIXME: Add this assertion to make sure we always get instantiation points.

clang/lib/Serialization/ASTReaderDecl.cpp

 #include "clang/Basic/Specifiers.h"
 #include "clang/Sema/IdentifierResolver.h"
 #include "clang/Serialization/ASTBitCodes.h"
 #include "clang/Serialization/ASTReader.h"
 #include "clang/Serialization/ContinuousRangeMap.h"
 #include "clang/Serialization/Module.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/FoldingSet.h"
+#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/Bitstream/BitstreamReader.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/SaveAndRestore.h"
AttrReader(ModuleFile &F, ASTReader &Reader,
       : F(&F), Reader(&Reader), Record(Record), Idx(Idx) {}
 
   const uint64_t &readInt() { return Record[Idx++]; }
 
   SourceRange readSourceRange() {
     return Reader->ReadSourceRange(*F, Record, Idx);
   }
 
+  SourceLocation readSourceLocation() {
+    return Reader->ReadSourceLocation(*F, Record, Idx);
+  }
+
   Expr *readExpr() { return Reader->ReadExpr(*F); }
 
   std::string readString() {
     return Reader->ReadString(Record, Idx);
   }
 
   TypeSourceInfo *getTypeSourceInfo() {
     return Reader->GetTypeSourceInfo(*F, Record, Idx);
Attr *ASTReader::ReadAttr(ModuleFile &M, const RecordData &Rec,
   auto V = Record.readInt();
   if (!V)
     return nullptr;
 
   Attr *New = nullptr;
   // Kind is stored as a 1-based integer because 0 is used to indicate a null
   // Attr pointer.
   auto Kind = static_cast<attr::Kind>(V - 1);
-  SourceRange Range = Record.readSourceRange();
   ASTContext &Context = getContext();
 
+  IdentifierInfo *AttrName = Record.getIdentifierInfo();
+  IdentifierInfo *ScopeName = Record.getIdentifierInfo();
+  SourceRange AttrRange = Record.readSourceRange();
+  SourceLocation ScopeLoc = Record.readSourceLocation();
+  unsigned ParsedKind = Record.readInt();
+  unsigned Syntax = Record.readInt();
+  unsigned SpellingIndex = Record.readInt();
+
+  AttributeCommonInfo Info(AttrName, ScopeName, AttrRange, ScopeLoc,
+                           AttributeCommonInfo::Kind(ParsedKind),
+                           AttributeCommonInfo::Syntax(Syntax), SpellingIndex);
+
 #include "clang/Serialization/AttrPCHRead.inc"
 
   assert(New && "Unable to decode attribute?");
   return New;
 }
 
 /// Reads attributes from the current stream position.
 void ASTReader::ReadAttributes(ASTRecordReader &Record, AttrVec &Attrs) {
case UPD_MANGLING_NUMBER:
                                             Record.readInt());
       break;
 
     case UPD_STATIC_LOCAL_NUMBER:
       Reader.getContext().setStaticLocalNumber(cast<VarDecl>(D),
                                                Record.readInt());
       break;
 
-    case UPD_DECL_MARKED_OPENMP_THREADPRIVATE:
-      D->addAttr(OMPThreadPrivateDeclAttr::CreateImplicit(Reader.getContext(),
-                                                          ReadSourceRange()));
+    case UPD_DECL_MARKED_OPENMP_THREADPRIVATE: {
+      AttributeCommonInfo Info(ReadSourceRange(),
+                               AttributeCommonInfo::UnknownAttribute,
+                               AttributeCommonInfo::AS_Pragma);
+      D->addAttr(
+          OMPThreadPrivateDeclAttr::CreateImplicit(Reader.getContext(), Info));
       break;
+    }
 
     case UPD_DECL_MARKED_OPENMP_ALLOCATE: {
       auto AllocatorKind =
           static_cast<OMPAllocateDeclAttr::AllocatorTypeTy>(Record.readInt());
       Expr *Allocator = Record.readExpr();
       SourceRange SR = ReadSourceRange();
+      AttributeCommonInfo Info(SR, AttributeCommonInfo::UnknownAttribute,
+                               AttributeCommonInfo::AS_Pragma);
       D->addAttr(OMPAllocateDeclAttr::CreateImplicit(
-          Reader.getContext(), AllocatorKind, Allocator, SR));
+          Reader.getContext(), AllocatorKind, Allocator, Info));
       break;
     }
 
     case UPD_DECL_EXPORTED: {
       unsigned SubmoduleID = readSubmoduleID();
       auto *Exported = cast<NamedDecl>(D);
       Module *Owner = SubmoduleID ? Reader.getSubmodule(SubmoduleID) : nullptr;
       Reader.getContext().mergeDefinitionIntoModule(Exported, Owner);
       Reader.PendingMergedDefinitionsToDeduplicate.insert(Exported);
       break;
     }
 
     case UPD_DECL_MARKED_OPENMP_DECLARETARGET: {
       OMPDeclareTargetDeclAttr::MapTypeTy MapType =
           static_cast<OMPDeclareTargetDeclAttr::MapTypeTy>(Record.readInt());
       OMPDeclareTargetDeclAttr::DevTypeTy DevType =
           static_cast<OMPDeclareTargetDeclAttr::DevTypeTy>(Record.readInt());
+      AttributeCommonInfo Info(ReadSourceRange(),
+                               AttributeCommonInfo::UnknownAttribute,
+                               AttributeCommonInfo::AS_Pragma);
       D->addAttr(OMPDeclareTargetDeclAttr::CreateImplicit(
-          Reader.getContext(), MapType, DevType, ReadSourceRange()));
+          Reader.getContext(), MapType, DevType, Info));
       break;
     }
 
     case UPD_ADDED_ATTR_TO_RECORD:
       AttrVec Attrs;
       Record.readAttributes(Attrs);
       assert(Attrs.size() == 1);
       D->addAttr(Attrs[0]);
       break;
     }
   }
 }

clang/lib/Serialization/ASTWriter.cpp

 // General Serialization Routines
 //===----------------------------------------------------------------------===//
 
 void ASTRecordWriter::AddAttr(const Attr *A) {
   auto &Record = *this;
   if (!A)
     return Record.push_back(0);
   Record.push_back(A->getKind() + 1); // FIXME: stable encoding, target attrs
+
+  Record.AddIdentifierRef(A->getAttrName());
+  Record.AddIdentifierRef(A->getScopeName());
   Record.AddSourceRange(A->getRange());
+  Record.AddSourceLocation(A->getScopeLoc());
+  Record.push_back(A->getParsedKind());
+  Record.push_back(A->getSyntax());
+  Record.push_back(A->getAttributeSpellingListIndexRaw());
 
 #include "clang/Serialization/AttrPCHWrite.inc"
 }
 
 /// Emit the list of attributes to the specified record.
 void ASTRecordWriter::AddAttributes(ArrayRef<const Attr *> Attrs) {
   push_back(Attrs.size());
   for (const auto *A : Attrs)

clang/utils/TableGen/ClangAttrEmitter.cpp

static void writeGetSpellingFunction(Record &R, raw_ostream &OS) {
   std::vector<FlattenedSpelling> Spellings = GetFlattenedSpellings(R);
 
   OS << "const char *" << R.getName() << "Attr::getSpelling() const {\n";
   if (Spellings.empty()) {
     OS << "  return \"(No spelling)\";\n}\n\n";
     return;
   }
 
-  OS << "  switch (SpellingListIndex) {\n"
+  OS << "  switch (getAttributeSpellingListIndex()) {\n"
         "  default:\n"
         "    llvm_unreachable(\"Unknown attribute spelling!\");\n"
         "    return \"(No spelling)\";\n";
 
   for (unsigned I = 0; I < Spellings.size(); ++I)
     OS << "  case " << I << ":\n"
           "    return \"" << Spellings[I].name() << "\";\n";
   // End of the switch statement.
writePrettyPrintFunction(Record &R,
   OS << "void " << R.getName() << "Attr::printPretty("
     << "raw_ostream &OS, const PrintingPolicy &Policy) const {\n";
 
   if (Spellings.empty()) {
     OS << "}\n\n";
     return;
   }
 
-  OS <<
-    "  switch (SpellingListIndex) {\n"
+  OS << "  switch (getAttributeSpellingListIndex()) {\n"
         "  default:\n"
         "    llvm_unreachable(\"Unknown attribute spelling!\");\n"
         "    break;\n";
 
   for (unsigned I = 0; I < Spellings.size(); ++ I) {
     llvm::SmallString<16> Prefix;
     llvm::SmallString<8> Suffix;
     // The actual spelling of the name and namespace (if applicable)
     // of an attribute without considering prefix and suffix.
     llvm::SmallString<64> Spelling;
     std::string Name = Spellings[I].name();
static void writeAttrAccessorDefinition(const Record &R, raw_ostream &OS) {
 
   const std::vector<FlattenedSpelling> SpellingList = GetFlattenedSpellings(R);
   assert(!SpellingList.empty() &&
          "Attribute with empty spelling list can't have accessors!");
   for (const auto *Accessor : Accessors) {
     const StringRef Name = Accessor->getValueAsString("Name");
     std::vector<FlattenedSpelling> Spellings = GetFlattenedSpellings(*Accessor);
 
-    OS << "  bool " << Name << "() const { return SpellingListIndex == ";
+    OS << "  bool " << Name
+       << "() const { return getAttributeSpellingListIndex() == ";
     for (unsigned Index = 0; Index < Spellings.size(); ++Index) {
       OS << getSpellingListIndex(SpellingList, Spellings[Index]);
       if (Index != Spellings.size() - 1)
-        OS << " ||\n    SpellingListIndex == ";
+        OS << " ||\n    getAttributeSpellingListIndex() == ";
       else
         OS << "; }\n";
     }
   }
 }
 
 static bool
 SpellingNamesAreCommon(const std::vector<FlattenedSpelling>& Spellings) {
for (const auto *Attr : Attrs) {
 
     if (!ElideSpelling)
       OS << CreateSemanticSpellings(Spellings, SemanticToSyntacticMap);
 
     // Emit CreateImplicit factory methods.
     auto emitCreateImplicit = [&](bool emitFake) {
       OS << "  static " << R.getName() << "Attr *CreateImplicit(";
       OS << "ASTContext &Ctx";
-      if (!ElideSpelling)
-        OS << ", Spelling S";
       for (auto const &ai : Args) {
         if (ai->isFake() && !emitFake) continue;
         OS << ", ";
         ai->writeCtorParameters(OS);
       }
-      OS << ", SourceRange Loc = SourceRange()";
-      OS << ") {\n";
+      OS << ",const AttributeCommonInfo &CommonInfo = {SourceRange{}}) {\n";
       OS << "    auto *A = new (Ctx) " << R.getName();
-      OS << "Attr(Loc, Ctx, ";
+      OS << "Attr(Ctx, CommonInfo";
       for (auto const &ai : Args) {
         if (ai->isFake() && !emitFake) continue;
-        ai->writeImplicitCtorArgs(OS);
         OS << ", ";
+        ai->writeImplicitCtorArgs(OS);
       }
-      OS << (ElideSpelling ? "0" : "S") << ");\n";
+      OS << ");\n";
       OS << "    A->setImplicit(true);\n";
+      OS << "    if (!A->isAttributeSpellingListCalculated() && "
+            "!A->getAttrName())\n";
+      OS << "      A->setAttributeSpellingListIndex(0);\n";
       OS << "    return A;\n  }\n\n";
     };
 
     // Emit a CreateImplicit that takes all the arguments.
     emitCreateImplicit(true);
 
     // Emit a CreateImplicit that takes all the non-fake arguments.
-    if (HasFakeArg) {
+    if (HasFakeArg)
       emitCreateImplicit(false);
-    }
 
     // Emit constructors.
     auto emitCtor = [&](bool emitOpt, bool emitFake) {
       auto shouldEmitArg = [=](const std::unique_ptr<Argument> &arg) {
         if (arg->isFake()) return emitFake;
         if (arg->isOptional()) return emitOpt;
         return true;
       };
-
-      OS << "  " << R.getName() << "Attr(SourceRange R, ASTContext &Ctx\n";
+      OS << "  " << R.getName()
+         << "Attr(ASTContext &Ctx, const AttributeCommonInfo &CommonInfo";
+      OS << '\n';
       for (auto const &ai : Args) {
         if (!shouldEmitArg(ai)) continue;
         OS << "              , ";
         ai->writeCtorParameters(OS);
         OS << "\n";
       }
 
-      OS << "              , ";
-      OS << "unsigned SI\n";
-
       OS << "             )\n";
-      OS << "    : " << SuperName << "(attr::" << R.getName() << ", R, SI, "
-         << ( R.getValueAsBit("LateParsed") ? "true" : "false" );
+      OS << "    : " << SuperName << "(Ctx, CommonInfo, ";
+      OS << "attr::" << R.getName() << ", "
+         << (R.getValueAsBit("LateParsed") ? "true" : "false");
       if (Inheritable) {
         OS << ", "
            << (R.getValueAsBit("InheritEvenIfAlreadyPresent") ? "true"
                                                               : "false");
       }
       OS << ")\n";
 
       for (auto const &ai : Args) {
auto emitCtor = [&](bool emitOpt, bool emitFake) {
       OS << "  }\n\n";
     };
 
     // Emit a constructor that includes all the arguments.
     // This is necessary for cloning.
     emitCtor(true, true);
 
     // Emit a constructor that takes all the non-fake arguments.
-    if (HasFakeArg) {
+    if (HasFakeArg)
       emitCtor(true, false);
-    }
  
     // Emit a constructor that takes all the non-fake, non-optional arguments.
-    if (HasOptArg) {
+    if (HasOptArg)
       emitCtor(false, false);
-    }
 
     OS << "  " << R.getName() << "Attr *clone(ASTContext &C) const;\n";
     OS << "  void printPretty(raw_ostream &OS,\n"
        << "                   const PrintingPolicy &Policy) const;\n";
     OS << "  const char *getSpelling() const;\n";
     
     if (!ElideSpelling) {
       assert(!SemanticToSyntacticMap.empty() && "Empty semantic mapping list");
       OS << "  Spelling getSemanticSpelling() const {\n";
-      WriteSemanticSpellingSwitch("SpellingListIndex", SemanticToSyntacticMap,
-                                  OS);
+      WriteSemanticSpellingSwitch("getAttributeSpellingListIndex()",
+                                  SemanticToSyntacticMap, OS);
       OS << "  }\n";
     }
 
     writeAttrAccessorDefinition(R, OS);
 
     for (auto const &ai : Args) {
       ai->writeAccessors(OS);
       OS << "\n\n";
for (auto *Attr : Attrs) {
     for (const auto *Arg : ArgRecords)
       Args.emplace_back(createArgument(*Arg, R.getName()));
 
     for (auto const &ai : Args)
       ai->writeAccessorDefinitions(OS);
 
     OS << R.getName() << "Attr *" << R.getName()
        << "Attr::clone(ASTContext &C) const {\n";
-    OS << "  auto *A = new (C) " << R.getName() << "Attr(getLocation(), C";
+    OS << "  auto *A = new (C) " << R.getName() << "Attr(C, *this";
     for (auto const &ai : Args) {
       OS << ", ";
       ai->writeCloneArgs(OS);
     }
-    OS << ", getSpellingListIndex());\n";
+    OS << ");\n";
     OS << "  A->Inherited = Inherited;\n";
     OS << "  A->IsPackExpansion = IsPackExpansion;\n";
-    OS << "  A->Implicit = Implicit;\n";
+    OS << "  A->setImplicit(Implicit);\n";
     OS << "  return A;\n}\n\n";
 
     writePrettyPrintFunction(R, Args, OS);
     writeGetSpellingFunction(R, OS);
   }
 
   // Instead of relying on virtual dispatch we just create a huge dispatch
   // switch. This is both smaller and faster than virtual functions.
std::vector<Record*> Attrs = Records.getAllDerivedDefinitions("Attr"),
                        ArgRecords;
   std::vector<std::unique_ptr<Argument>> Args;
 
   OS << "  switch (Kind) {\n";
   for (const auto *Attr : Attrs) {
     const Record &R = *Attr;
     if (!R.getValueAsBit("ASTNode"))
       continue;
-    
     OS << "  case attr::" << R.getName() << ": {\n";
     if (R.isSubClassOf(InhClass))
       OS << "    bool isInherited = Record.readInt();\n";
     OS << "    bool isImplicit = Record.readInt();\n";
-    OS << "    unsigned Spelling = Record.readInt();\n";
     ArgRecords = R.getValueAsListOfDefs("Args");
     Args.clear();
     for (const auto *Arg : ArgRecords) {
       Args.emplace_back(createArgument(*Arg, R.getName()));
       Args.back()->writePCHReadDecls(OS);
     }
-    OS << "    New = new (Context) " << R.getName() << "Attr(Range, Context";
+    OS << "    New = new (Context) " << R.getName() << "Attr(Context, Info";
     for (auto const &ri : Args) {
       OS << ", ";
       ri->writePCHReadArgs(OS);
     }
-    OS << ", Spelling);\n";
+    OS << ");\n";
     if (R.isSubClassOf(InhClass))
       OS << "    cast<InheritableAttr>(New)->setInherited(isInherited);\n";
     OS << "    New->setImplicit(isImplicit);\n";
     OS << "    break;\n";
     OS << "  }\n";
   }
   OS << "  }\n";
 }
for (const auto *Attr : Attrs) {
     OS << "  case attr::" << R.getName() << ": {\n";
     Args = R.getValueAsListOfDefs("Args");
     if (R.isSubClassOf(InhClass) || !Args.empty())
       OS << "    const auto *SA = cast<" << R.getName()
          << "Attr>(A);\n";
     if (R.isSubClassOf(InhClass))
       OS << "    Record.push_back(SA->isInherited());\n";
     OS << "    Record.push_back(A->isImplicit());\n";
-    OS << "    Record.push_back(A->getSpellingListIndex());\n";
 
     for (const auto *Arg : Args)
       createArgument(*Arg, R.getName())->writePCHWrite(OS);
     OS << "    break;\n";
     OS << "  }\n";
   }
   OS << "  }\n";
 }
void EmitClangAttrHasAttrImpl(RecordKeeper &Records, raw_ostream &OS) {
   fn("C2x", "C", C2x);
   OS << "}\n";
 }
 
 void EmitClangAttrSpellingListIndex(RecordKeeper &Records, raw_ostream &OS) {
   emitSourceFileHeader("Code to translate different attribute spellings "
                        "into internal identifiers", OS);
 
-  OS << "  switch (AttrKind) {\n";
+  OS << "  switch (getParsedKind()) {\n";
+  OS << "    case IgnoredAttribute:\n";
+  OS << "    case UnknownAttribute:\n";
+  OS << "      llvm_unreachable(\"Ignored/unknown shouldn't get here\");\n";
 
   ParsedAttrMap Attrs = getParsedAttrList(Records);
   for (const auto &I : Attrs) {
     const Record &R = *I.second;
     std::vector<FlattenedSpelling> Spellings = GetFlattenedSpellings(R);
     OS << "  case AT_" << I.first << ": {\n";
     for (unsigned I = 0; I < Spellings.size(); ++ I) {
       OS << "    if (Name == \"" << Spellings[I].name() << "\" && "
-         << "SyntaxUsed == "
-         << StringSwitch<unsigned>(Spellings[I].variety())
-                .Case("GNU", 0)
-                .Case("CXX11", 1)
-                .Case("C2x", 2)
-                .Case("Declspec", 3)
-                .Case("Microsoft", 4)
-                .Case("Keyword", 5)
-                .Case("Pragma", 6)
-                .Default(0)
+         << "getSyntax() == AttributeCommonInfo::AS_" << Spellings[I].variety()
          << " && Scope == \"" << Spellings[I].nameSpace() << "\")\n"
          << "        return " << I << ";\n";
     }
 
     OS << "    break;\n";
     OS << "  }\n";
   }
 
for (const auto *Attr : Attrs) {
     Args.reserve(ArgRecords.size());
 
     for (const auto *ArgRecord : ArgRecords)
       Args.emplace_back(createArgument(*ArgRecord, R.getName()));
 
     for (auto const &ai : Args)
       ai->writeTemplateInstantiation(OS);
 
-    OS << "      return new (C) " << R.getName() << "Attr(A->getLocation(), C";
+    OS << "        return new (C) " << R.getName() << "Attr(C, *A";
     for (auto const &ai : Args) {
       OS << ", ";
       ai->writeTemplateInstantiationArgs(OS);
     }
-    OS << ", A->getSpellingListIndex());\n    }\n";
+    OS << ");\n    }\n";
   }
   OS << "  } // end switch\n"
      << "  llvm_unreachable(\"Unknown attribute!\");\n"
      << "  return nullptr;\n";
 }
 
 // Emits code to instantiate dependent attributes on templates.
 void EmitClangAttrTemplateInstantiate(RecordKeeper &Records, raw_ostream &OS) {
static std::string GenerateLangOptRequirements(const Record &R,
   if (I != CustomLangOptsSet.end())
     return *I;
 
   OS << "static bool " << FnName << "(Sema &S, const ParsedAttr &Attr) {\n";
   OS << "  auto &LangOpts = S.LangOpts;\n";
   OS << "  if (" << GenerateTestExpression(LangOpts) << ")\n";
   OS << "    return true;\n\n";
   OS << "  S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) ";
-  OS << "<< Attr.getName();\n";
+  OS << "<< Attr;\n";
   OS << "  return false;\n";
   OS << "}\n\n";
 
   CustomLangOptsSet.insert(FnName);
   return FnName;
 }
 
 static void GenerateDefaultTargetRequirements(raw_ostream &OS) {