diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
@@ -98,7 +98,8 @@ C++20 Feature Support
   behavior can use the flag '-Xclang -fno-skip-odr-check-in-gmf'.
   (#GH79240).
 
-- Implemented the `__is_layout_compatible` intrinsic to support
+- Implemented the `__is_layout_compatible` and `__is_pointer_interconvertible_base_of`
+  intrinsics to support
   `P0466R5: Layout-compatibility and Pointer-interconvertibility Traits <https://wg21.link/P0466R5>`_.
 
 - Clang now implements [module.import]p7 fully. Clang now will import module
@@ -110,6 +111,10 @@ C++20 Feature Support
   templates (`P1814R0 <https://wg21.link/p1814r0>`_).
   (#GH54051).
 
+- We have sufficient confidence and experience with the concepts implementation
+  to update the ``__cpp_concepts`` macro to `202002L`. This enables
+  ``<expected>`` from libstdc++ to work correctly with Clang.
+
 C++23 Feature Support
 ^^^^^^^^^^^^^^^^^^^^^
 
@@ -124,6 +129,8 @@ C++2c Feature Support
 
 - Implemented `P2662R3 Pack Indexing <https://wg21.link/P2662R3>`_.
 
+- Implemented `P2573R2: = delete("should have a reason"); <https://wg21.link/P2573R2>`_
+
 
 Resolutions to C++ Defect Reports
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -143,6 +150,9 @@ Resolutions to C++ Defect Reports
   compatibility of two types.
   (`CWG2759: [[no_unique_address] and common initial sequence  <https://cplusplus.github.io/CWG/issues/2759.html>`_).
 
+- Clang now diagnoses declarative nested-name-specifiers with pack-index-specifiers.
+  (`CWG2858: Declarative nested-name-specifiers and pack-index-specifiers <https://cplusplus.github.io/CWG/issues/2858.html>`_).
+
 C Language Changes
 ------------------
 
@@ -198,6 +208,10 @@ Non-comprehensive list of changes in this release
 
 New Compiler Flags
 ------------------
+- ``-fsanitize=implicit-bitfield-conversion`` checks implicit truncation and
+  sign change.
+- ``-fsanitize=implicit-integer-conversion`` a group that replaces the previous
+  group ``-fsanitize=implicit-conversion``.
 
 - ``-Wmissing-designated-field-initializers``, grouped under ``-Wmissing-field-initializers``.
   This diagnostic can be disabled to make ``-Wmissing-field-initializers`` behave
@@ -211,6 +225,9 @@ Modified Compiler Flags
 - Added a new diagnostic flag ``-Wreturn-mismatch`` which is grouped under
   ``-Wreturn-type``, and moved some of the diagnostics previously controlled by
   ``-Wreturn-type`` under this new flag. Fixes #GH72116.
+- ``-fsanitize=implicit-conversion`` is now a group for both
+  ``-fsanitize=implicit-integer-conversion`` and
+  ``-fsanitize=implicit-bitfield-conversion``.
 
 - Added ``-Wcast-function-type-mismatch`` under the ``-Wcast-function-type``
   warning group. Moved the diagnostic previously controlled by
@@ -341,11 +358,23 @@ Improvements to Clang's diagnostics
   (with initializer) entirely consist the condition expression of a if/while/for construct
   but are not actually used in the body of the if/while/for construct. Fixes #GH41447
 
+- Clang emits a diagnostic when a tentative array definition is assumed to have
+  a single element, but that diagnostic was never given a diagnostic group.
+  Added the ``-Wtentative-definition-array`` warning group to cover this.
+  Fixes #GH87766
+
+- Clang now uses the correct type-parameter-key (``class`` or ``typename``) when printing
+  template template parameter declarations.
+
 Improvements to Clang's time-trace
 ----------------------------------
 
 Bug Fixes in This Version
 -------------------------
+- Clang's ``-Wundefined-func-template`` no longer warns on pure virtual
+  functions.
+  (`#74016 <https://github.com/llvm/llvm-project/issues/74016>`_)
+
 - Fixed missing warnings when comparing mismatched enumeration constants
   in C (`#29217 <https://github.com/llvm/llvm-project/issues/29217>`).
 
@@ -504,10 +533,15 @@ Bug Fixes to C++ Support
 - Fix crash when inheriting from a cv-qualified type. Fixes:
   (`#35603 <https://github.com/llvm/llvm-project/issues/35603>`_)
 - Fix a crash when the using enum declaration uses an anonymous enumeration. Fixes (#GH86790).
+- Handled an edge case in ``getFullyPackExpandedSize`` so that we now avoid a false-positive diagnostic. (#GH84220)
+- Clang now correctly tracks type dependence of by-value captures in lambdas with an explicit
+  object parameter.
+  Fixes (#GH70604), (#GH79754), (#GH84163), (#GH84425), (#GH86054), (#GH86398), and (#GH86399).
 
 Bug Fixes to AST Handling
 ^^^^^^^^^^^^^^^^^^^^^^^^^
 - Clang now properly preserves ``FoundDecls`` within a ``ConceptReference``. (#GH82628)
+- The presence of the ``typename`` keyword is now stored in ``TemplateTemplateParmDecl``.
 
 Miscellaneous Bug Fixes
 ^^^^^^^^^^^^^^^^^^^^^^^
@@ -622,10 +656,14 @@ Fixed Point Support in Clang
 AST Matchers
 ------------
 
+- Fixes a long-standing performance issue in parent map generation for
+  ancestry-based matchers such as ``hasParent`` and ``hasAncestor``, making
+  them significantly faster.
 - ``isInStdNamespace`` now supports Decl declared with ``extern "C++"``.
 - Add ``isExplicitObjectMemberFunction``.
 - Fixed ``forEachArgumentWithParam`` and ``forEachArgumentWithParamType`` to
   not skip the explicit object parameter for operator calls.
+- Fixed captureVars assertion failure if not capturesVariables. (#GH76425)
 
 clang-format
 ------------

diff --git a/clang/docs/UndefinedBehaviorSanitizer.rst b/clang/docs/UndefinedBehaviorSanitizer.rst
@@ -148,6 +148,11 @@ Available checks are:
      Issues caught by this sanitizer are not undefined behavior,
      but are often unintentional.
   -  ``-fsanitize=integer-divide-by-zero``: Integer division by zero.
+  -  ``-fsanitize=implicit-bitfield-conversion``: Implicit conversion from
+     integer of larger bit width to smaller bitfield, if that results in data
+     loss. This includes unsigned/signed truncations and sign changes, similarly
+     to how the ``-fsanitize=implicit-integer-conversion`` group works, but
+     explicitly for bitfields.
   -  ``-fsanitize=nonnull-attribute``: Passing null pointer as a function
      parameter which is declared to never be null.
   -  ``-fsanitize=null``: Use of a null pointer or creation of a null
@@ -193,16 +198,16 @@ Available checks are:
      signed division overflow (``INT_MIN/-1``). Note that checks are still
      added even when ``-fwrapv`` is enabled. This sanitizer does not check for
      lossy implicit conversions performed before the computation (see
-     ``-fsanitize=implicit-conversion``). Both of these two issues are handled
-     by ``-fsanitize=implicit-conversion`` group of checks.
+     ``-fsanitize=implicit-integer-conversion``). Both of these two issues are handled
+     by ``-fsanitize=implicit-integer-conversion`` group of checks.
   -  ``-fsanitize=unreachable``: If control flow reaches an unreachable
      program point.
   -  ``-fsanitize=unsigned-integer-overflow``: Unsigned integer overflow, where
      the result of an unsigned integer computation cannot be represented in its
      type. Unlike signed integer overflow, this is not undefined behavior, but
      it is often unintentional. This sanitizer does not check for lossy implicit
      conversions performed before such a computation
-     (see ``-fsanitize=implicit-conversion``).
+     (see ``-fsanitize=implicit-integer-conversion``).
   -  ``-fsanitize=vla-bound``: A variable-length array whose bound
      does not evaluate to a positive value.
   -  ``-fsanitize=vptr``: Use of an object whose vptr indicates that it is of
@@ -224,11 +229,15 @@ You can also use the following check groups:
   -  ``-fsanitize=implicit-integer-arithmetic-value-change``: Catches implicit
      conversions that change the arithmetic value of the integer. Enables
      ``implicit-signed-integer-truncation`` and ``implicit-integer-sign-change``.
-  -  ``-fsanitize=implicit-conversion``: Checks for suspicious
-     behavior of implicit conversions. Enables
+  -  ``-fsanitize=implicit-integer-conversion``: Checks for suspicious
+     behavior of implicit integer conversions. Enables
      ``implicit-unsigned-integer-truncation``,
      ``implicit-signed-integer-truncation``, and
      ``implicit-integer-sign-change``.
+  -  ``-fsanitize=implicit-conversion``: Checks for suspicious
+     behavior of implicit conversions. Enables
+     ``implicit-integer-conversion``, and
+     ``implicit-bitfield-conversion``.
   -  ``-fsanitize=integer``: Checks for undefined or suspicious integer
      behavior (e.g. unsigned integer overflow).
      Enables ``signed-integer-overflow``, ``unsigned-integer-overflow``,

diff --git a/clang/docs/analyzer/checkers.rst b/clang/docs/analyzer/checkers.rst
@@ -3138,10 +3138,16 @@ are detected:
   allowed in this state.
 * Invalid 3rd ("``whence``") argument to ``fseek``.
 
-The checker does not track the correspondence between integer file descriptors
-and ``FILE *`` pointers. Operations on standard streams like ``stdin`` are not
-treated specially and are therefore often not recognized (because these streams
-are usually not opened explicitly by the program, and are global variables).
+The stream operations are by this checker usually split into two cases, a success
+and a failure case. However, in the case of write operations (like ``fwrite``,
+``fprintf`` and even ``fsetpos``) this behavior could produce a large amount of
+unwanted reports on projects that don't have error checks around the write
+operations, so by default the checker assumes that write operations always succeed.
+This behavior can be controlled by the ``Pedantic`` flag: With
+``-analyzer-config alpha.unix.Stream:Pedantic=true`` the checker will model the
+cases where a write operation fails and report situations where this leads to
+erroneous behavior. (The default is ``Pedantic=false``, where write operations
+are assumed to succeed.)
 
 .. code-block:: c
 
@@ -3196,6 +3202,13 @@ are usually not opened explicitly by the program, and are global variables).
    fclose(p);
  }
 
+**Limitations**
+
+The checker does not track the correspondence between integer file descriptors
+and ``FILE *`` pointers. Operations on standard streams like ``stdin`` are not
+treated specially and are therefore often not recognized (because these streams
+are usually not opened explicitly by the program, and are global variables).
+
 .. _alpha-unix-cstring-BufferOverlap:
 
 alpha.unix.cstring.BufferOverlap (C)

diff --git a/clang/docs/tools/clang-formatted-files.txt b/clang/docs/tools/clang-formatted-files.txt
@@ -123,7 +123,6 @@ clang/include/clang/Analysis/Analyses/CalledOnceCheck.h
 clang/include/clang/Analysis/Analyses/CFGReachabilityAnalysis.h
 clang/include/clang/Analysis/Analyses/ExprMutationAnalyzer.h
 clang/include/clang/Analysis/FlowSensitive/AdornedCFG.h
-clang/include/clang/Analysis/FlowSensitive/ControlFlowContext.h
 clang/include/clang/Analysis/FlowSensitive/DataflowAnalysis.h
 clang/include/clang/Analysis/FlowSensitive/DataflowAnalysisContext.h
 clang/include/clang/Analysis/FlowSensitive/DataflowEnvironment.h
@@ -2147,8 +2146,10 @@ flang/include/flang/Parser/message.h
 flang/include/flang/Parser/parse-state.h
 flang/include/flang/Parser/parse-tree-visitor.h
 flang/include/flang/Parser/parsing.h
+flang/include/flang/Parser/preprocessor.h
 flang/include/flang/Parser/provenance.h
 flang/include/flang/Parser/source.h
+flang/include/flang/Parser/token-sequence.h
 flang/include/flang/Parser/tools.h
 flang/include/flang/Parser/unparse.h
 flang/include/flang/Parser/user-state.h
@@ -2319,7 +2320,6 @@ flang/lib/Parser/openmp-parsers.cpp
 flang/lib/Parser/parse-tree.cpp
 flang/lib/Parser/parsing.cpp
 flang/lib/Parser/preprocessor.cpp
-flang/lib/Parser/preprocessor.h
 flang/lib/Parser/prescan.cpp
 flang/lib/Parser/prescan.h
 flang/lib/Parser/program-parsers.cpp
@@ -2328,7 +2328,6 @@ flang/lib/Parser/source.cpp
 flang/lib/Parser/stmt-parser.h
 flang/lib/Parser/token-parsers.h
 flang/lib/Parser/token-sequence.cpp
-flang/lib/Parser/token-sequence.h
 flang/lib/Parser/tools.cpp
 flang/lib/Parser/type-parser-implementation.h
 flang/lib/Parser/type-parsers.h

diff --git a/clang/include/clang/AST/ASTContext.h b/clang/include/clang/AST/ASTContext.h
@@ -3411,13 +3411,13 @@ const StreamingDiagnostic &operator<<(const StreamingDiagnostic &DB,
 
 /// Utility function for constructing a nullary selector.
 inline Selector GetNullarySelector(StringRef name, ASTContext &Ctx) {
-  IdentifierInfo* II = &Ctx.Idents.get(name);
+  const IdentifierInfo *II = &Ctx.Idents.get(name);
   return Ctx.Selectors.getSelector(0, &II);
 }
 
 /// Utility function for constructing an unary selector.
 inline Selector GetUnarySelector(StringRef name, ASTContext &Ctx) {
-  IdentifierInfo* II = &Ctx.Idents.get(name);
+  const IdentifierInfo *II = &Ctx.Idents.get(name);
   return Ctx.Selectors.getSelector(1, &II);
 }
 

diff --git a/clang/include/clang/AST/ASTNodeTraverser.h b/clang/include/clang/AST/ASTNodeTraverser.h
@@ -243,7 +243,8 @@ class ASTNodeTraverser
   void Visit(const OpenACCClause *C) {
     getNodeDelegate().AddChild([=] {
       getNodeDelegate().Visit(C);
-      // TODO OpenACC: Switch on clauses that have children, and add them.
+      for (const auto *S : C->children())
+        Visit(S);
     });
   }
 
@@ -932,6 +933,14 @@ class ASTNodeTraverser
       Visit(TArg);
   }
 
+  void VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *Node) {
+    Visit(Node->getExpr());
+  }
+
+  void VisitCXXDefaultInitExpr(const CXXDefaultInitExpr *Node) {
+    Visit(Node->getExpr());
+  }
+
   // Implements Visit methods for Attrs.
 #include "clang/AST/AttrNodeTraverse.inc"
 };

diff --git a/clang/include/clang/AST/Decl.h b/clang/include/clang/AST/Decl.h
@@ -1731,7 +1731,7 @@ class ImplicitParamDecl : public VarDecl {
   static ImplicitParamDecl *CreateDeserialized(ASTContext &C, unsigned ID);
 
   ImplicitParamDecl(ASTContext &C, DeclContext *DC, SourceLocation IdLoc,
-                    IdentifierInfo *Id, QualType Type,
+                    const IdentifierInfo *Id, QualType Type,
                     ImplicitParamKind ParamKind)
       : VarDecl(ImplicitParam, C, DC, IdLoc, IdLoc, Id, Type,
                 /*TInfo=*/nullptr, SC_None) {
@@ -1765,7 +1765,7 @@ class ParmVarDecl : public VarDecl {
 
 protected:
   ParmVarDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
-              SourceLocation IdLoc, IdentifierInfo *Id, QualType T,
+              SourceLocation IdLoc, const IdentifierInfo *Id, QualType T,
               TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg)
       : VarDecl(DK, C, DC, StartLoc, IdLoc, Id, T, TInfo, S) {
     assert(ParmVarDeclBits.HasInheritedDefaultArg == false);
@@ -1777,10 +1777,10 @@ class ParmVarDecl : public VarDecl {
 
 public:
   static ParmVarDecl *Create(ASTContext &C, DeclContext *DC,
-                             SourceLocation StartLoc,
-                             SourceLocation IdLoc, IdentifierInfo *Id,
-                             QualType T, TypeSourceInfo *TInfo,
-                             StorageClass S, Expr *DefArg);
+                             SourceLocation StartLoc, SourceLocation IdLoc,
+                             const IdentifierInfo *Id, QualType T,
+                             TypeSourceInfo *TInfo, StorageClass S,
+                             Expr *DefArg);
 
   static ParmVarDecl *CreateDeserialized(ASTContext &C, unsigned ID);
 
@@ -1993,21 +1993,35 @@ class FunctionDecl : public DeclaratorDecl,
 
   };
 
-  /// Stashed information about a defaulted function definition whose body has
-  /// not yet been lazily generated.
-  class DefaultedFunctionInfo final
-      : llvm::TrailingObjects<DefaultedFunctionInfo, DeclAccessPair> {
+  /// Stashed information about a defaulted/deleted function body.
+  class DefaultedOrDeletedFunctionInfo final
+      : llvm::TrailingObjects<DefaultedOrDeletedFunctionInfo, DeclAccessPair,
+                              StringLiteral *> {
     friend TrailingObjects;
     unsigned NumLookups;
+    bool HasDeletedMessage;
+
+    size_t numTrailingObjects(OverloadToken<DeclAccessPair>) const {
+      return NumLookups;
+    }
 
   public:
-    static DefaultedFunctionInfo *Create(ASTContext &Context,
-                                         ArrayRef<DeclAccessPair> Lookups);
+    static DefaultedOrDeletedFunctionInfo *
+    Create(ASTContext &Context, ArrayRef<DeclAccessPair> Lookups,
+           StringLiteral *DeletedMessage = nullptr);
+
     /// Get the unqualified lookup results that should be used in this
     /// defaulted function definition.
     ArrayRef<DeclAccessPair> getUnqualifiedLookups() const {
       return {getTrailingObjects<DeclAccessPair>(), NumLookups};
     }
+
+    StringLiteral *getDeletedMessage() const {
+      return HasDeletedMessage ? *getTrailingObjects<StringLiteral *>()
+                               : nullptr;
+    }
+
+    void setDeletedMessage(StringLiteral *Message);
   };
 
 private:
@@ -2017,12 +2031,12 @@ class FunctionDecl : public DeclaratorDecl,
   ParmVarDecl **ParamInfo = nullptr;
 
   /// The active member of this union is determined by
-  /// FunctionDeclBits.HasDefaultedFunctionInfo.
+  /// FunctionDeclBits.HasDefaultedOrDeletedInfo.
   union {
     /// The body of the function.
     LazyDeclStmtPtr Body;
     /// Information about a future defaulted function definition.
-    DefaultedFunctionInfo *DefaultedInfo;
+    DefaultedOrDeletedFunctionInfo *DefaultedOrDeletedInfo;
   };
 
   unsigned ODRHash;
@@ -2280,18 +2294,18 @@ class FunctionDecl : public DeclaratorDecl,
 
   /// Returns whether this specific declaration of the function has a body.
   bool doesThisDeclarationHaveABody() const {
-    return (!FunctionDeclBits.HasDefaultedFunctionInfo && Body) ||
+    return (!FunctionDeclBits.HasDefaultedOrDeletedInfo && Body) ||
            isLateTemplateParsed();
   }
 
   void setBody(Stmt *B);
   void setLazyBody(uint64_t Offset) {
-    FunctionDeclBits.HasDefaultedFunctionInfo = false;
+    FunctionDeclBits.HasDefaultedOrDeletedInfo = false;
     Body = LazyDeclStmtPtr(Offset);
   }
 
-  void setDefaultedFunctionInfo(DefaultedFunctionInfo *Info);
-  DefaultedFunctionInfo *getDefaultedFunctionInfo() const;
+  void setDefaultedOrDeletedInfo(DefaultedOrDeletedFunctionInfo *Info);
+  DefaultedOrDeletedFunctionInfo *getDefalutedOrDeletedInfo() const;
 
   /// Whether this function is variadic.
   bool isVariadic() const;
@@ -2494,7 +2508,7 @@ class FunctionDecl : public DeclaratorDecl,
     return FunctionDeclBits.IsDeleted && !isDefaulted();
   }
 
-  void setDeletedAsWritten(bool D = true) { FunctionDeclBits.IsDeleted = D; }
+  void setDeletedAsWritten(bool D = true, StringLiteral *Message = nullptr);
 
   /// Determines whether this function is "main", which is the
   /// entry point into an executable program.
@@ -2650,6 +2664,13 @@ class FunctionDecl : public DeclaratorDecl,
       AC.push_back(TRC);
   }
 
+  /// Get the message that indicates why this function was deleted.
+  StringLiteral *getDeletedMessage() const {
+    return FunctionDeclBits.HasDefaultedOrDeletedInfo
+               ? DefaultedOrDeletedInfo->getDeletedMessage()
+               : nullptr;
+  }
+
   void setPreviousDeclaration(FunctionDecl * PrevDecl);
 
   FunctionDecl *getCanonicalDecl() override;
@@ -3095,7 +3116,7 @@ class FieldDecl : public DeclaratorDecl, public Mergeable<FieldDecl> {
 
 protected:
   FieldDecl(Kind DK, DeclContext *DC, SourceLocation StartLoc,
-            SourceLocation IdLoc, IdentifierInfo *Id, QualType T,
+            SourceLocation IdLoc, const IdentifierInfo *Id, QualType T,
             TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
             InClassInitStyle InitStyle)
       : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc), BitField(false),
@@ -3111,7 +3132,7 @@ class FieldDecl : public DeclaratorDecl, public Mergeable<FieldDecl> {
 
   static FieldDecl *Create(const ASTContext &C, DeclContext *DC,
                            SourceLocation StartLoc, SourceLocation IdLoc,
-                           IdentifierInfo *Id, QualType T,
+                           const IdentifierInfo *Id, QualType T,
                            TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
                            InClassInitStyle InitStyle);
 
@@ -3332,8 +3353,9 @@ class IndirectFieldDecl : public ValueDecl,
   friend class ASTDeclReader;
 
   static IndirectFieldDecl *Create(ASTContext &C, DeclContext *DC,
-                                   SourceLocation L, IdentifierInfo *Id,
-                                   QualType T, llvm::MutableArrayRef<NamedDecl *> CH);
+                                   SourceLocation L, const IdentifierInfo *Id,
+                                   QualType T,
+                                   llvm::MutableArrayRef<NamedDecl *> CH);
 
   static IndirectFieldDecl *CreateDeserialized(ASTContext &C, unsigned ID);
 
@@ -3381,9 +3403,9 @@ class TypeDecl : public NamedDecl {
   void anchor() override;
 
 protected:
-  TypeDecl(Kind DK, DeclContext *DC, SourceLocation L, IdentifierInfo *Id,
+  TypeDecl(Kind DK, DeclContext *DC, SourceLocation L, const IdentifierInfo *Id,
            SourceLocation StartL = SourceLocation())
-    : NamedDecl(DK, DC, L, Id), LocStart(StartL) {}
+      : NamedDecl(DK, DC, L, Id), LocStart(StartL) {}
 
 public:
   // Low-level accessor. If you just want the type defined by this node,
@@ -3425,7 +3447,7 @@ class TypedefNameDecl : public TypeDecl, public Redeclarable<TypedefNameDecl> {
 protected:
   TypedefNameDecl(Kind DK, ASTContext &C, DeclContext *DC,
                   SourceLocation StartLoc, SourceLocation IdLoc,
-                  IdentifierInfo *Id, TypeSourceInfo *TInfo)
+                  const IdentifierInfo *Id, TypeSourceInfo *TInfo)
       : TypeDecl(DK, DC, IdLoc, Id, StartLoc), redeclarable_base(C),
         MaybeModedTInfo(TInfo, 0) {}
 
@@ -3512,13 +3534,14 @@ class TypedefNameDecl : public TypeDecl, public Redeclarable<TypedefNameDecl> {
 /// type specifier.
 class TypedefDecl : public TypedefNameDecl {
   TypedefDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
-              SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo)
+              SourceLocation IdLoc, const IdentifierInfo *Id,
+              TypeSourceInfo *TInfo)
       : TypedefNameDecl(Typedef, C, DC, StartLoc, IdLoc, Id, TInfo) {}
 
 public:
   static TypedefDecl *Create(ASTContext &C, DeclContext *DC,
                              SourceLocation StartLoc, SourceLocation IdLoc,
-                             IdentifierInfo *Id, TypeSourceInfo *TInfo);
+                             const IdentifierInfo *Id, TypeSourceInfo *TInfo);
   static TypedefDecl *CreateDeserialized(ASTContext &C, unsigned ID);
 
   SourceRange getSourceRange() const override LLVM_READONLY;
@@ -3535,14 +3558,15 @@ class TypeAliasDecl : public TypedefNameDecl {
   TypeAliasTemplateDecl *Template;
 
   TypeAliasDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
-                SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo)
+                SourceLocation IdLoc, const IdentifierInfo *Id,
+                TypeSourceInfo *TInfo)
       : TypedefNameDecl(TypeAlias, C, DC, StartLoc, IdLoc, Id, TInfo),
         Template(nullptr) {}
 
 public:
   static TypeAliasDecl *Create(ASTContext &C, DeclContext *DC,
                                SourceLocation StartLoc, SourceLocation IdLoc,
-                               IdentifierInfo *Id, TypeSourceInfo *TInfo);
+                               const IdentifierInfo *Id, TypeSourceInfo *TInfo);
   static TypeAliasDecl *CreateDeserialized(ASTContext &C, unsigned ID);
 
   SourceRange getSourceRange() const override LLVM_READONLY;

diff --git a/clang/include/clang/AST/DeclBase.h b/clang/include/clang/AST/DeclBase.h
@@ -1739,7 +1739,7 @@ class DeclContext {
     LLVM_PREFERRED_TYPE(bool)
     uint64_t IsExplicitlyDefaulted : 1;
     LLVM_PREFERRED_TYPE(bool)
-    uint64_t HasDefaultedFunctionInfo : 1;
+    uint64_t HasDefaultedOrDeletedInfo : 1;
 
     /// For member functions of complete types, whether this is an ineligible
     /// special member function or an unselected destructor. See

diff --git a/clang/include/clang/AST/DeclObjC.h b/clang/include/clang/AST/DeclObjC.h
@@ -772,7 +772,7 @@ class ObjCPropertyDecl : public NamedDecl {
   // Synthesize ivar for this property
   ObjCIvarDecl *PropertyIvarDecl = nullptr;
 
-  ObjCPropertyDecl(DeclContext *DC, SourceLocation L, IdentifierInfo *Id,
+  ObjCPropertyDecl(DeclContext *DC, SourceLocation L, const IdentifierInfo *Id,
                    SourceLocation AtLocation, SourceLocation LParenLocation,
                    QualType T, TypeSourceInfo *TSI, PropertyControl propControl)
       : NamedDecl(ObjCProperty, DC, L, Id), AtLoc(AtLocation),
@@ -782,10 +782,12 @@ class ObjCPropertyDecl : public NamedDecl {
         PropertyImplementation(propControl) {}
 
 public:
-  static ObjCPropertyDecl *
-  Create(ASTContext &C, DeclContext *DC, SourceLocation L, IdentifierInfo *Id,
-         SourceLocation AtLocation, SourceLocation LParenLocation, QualType T,
-         TypeSourceInfo *TSI, PropertyControl propControl = None);
+  static ObjCPropertyDecl *Create(ASTContext &C, DeclContext *DC,
+                                  SourceLocation L, const IdentifierInfo *Id,
+                                  SourceLocation AtLocation,
+                                  SourceLocation LParenLocation, QualType T,
+                                  TypeSourceInfo *TSI,
+                                  PropertyControl propControl = None);
 
   static ObjCPropertyDecl *CreateDeserialized(ASTContext &C, unsigned ID);
 
@@ -952,7 +954,7 @@ class ObjCContainerDecl : public NamedDecl, public DeclContext {
   void anchor() override;
 
 public:
-  ObjCContainerDecl(Kind DK, DeclContext *DC, IdentifierInfo *Id,
+  ObjCContainerDecl(Kind DK, DeclContext *DC, const IdentifierInfo *Id,
                     SourceLocation nameLoc, SourceLocation atStartLoc);
 
   // Iterator access to instance/class properties.
@@ -1240,7 +1242,7 @@ class ObjCInterfaceDecl : public ObjCContainerDecl
   llvm::PointerIntPair<DefinitionData *, 1, bool> Data;
 
   ObjCInterfaceDecl(const ASTContext &C, DeclContext *DC, SourceLocation AtLoc,
-                    IdentifierInfo *Id, ObjCTypeParamList *typeParamList,
+                    const IdentifierInfo *Id, ObjCTypeParamList *typeParamList,
                     SourceLocation CLoc, ObjCInterfaceDecl *PrevDecl,
                     bool IsInternal);
 
@@ -1271,13 +1273,11 @@ class ObjCInterfaceDecl : public ObjCContainerDecl
   }
 
 public:
-  static ObjCInterfaceDecl *Create(const ASTContext &C, DeclContext *DC,
-                                   SourceLocation atLoc,
-                                   IdentifierInfo *Id,
-                                   ObjCTypeParamList *typeParamList,
-                                   ObjCInterfaceDecl *PrevDecl,
-                                   SourceLocation ClassLoc = SourceLocation(),
-                                   bool isInternal = false);
+  static ObjCInterfaceDecl *
+  Create(const ASTContext &C, DeclContext *DC, SourceLocation atLoc,
+         const IdentifierInfo *Id, ObjCTypeParamList *typeParamList,
+         ObjCInterfaceDecl *PrevDecl,
+         SourceLocation ClassLoc = SourceLocation(), bool isInternal = false);
 
   static ObjCInterfaceDecl *CreateDeserialized(const ASTContext &C, unsigned ID);
 
@@ -1338,7 +1338,8 @@ class ObjCInterfaceDecl : public ObjCContainerDecl
   ObjCImplementationDecl *getImplementation() const;
   void setImplementation(ObjCImplementationDecl *ImplD);
 
-  ObjCCategoryDecl *FindCategoryDeclaration(IdentifierInfo *CategoryId) const;
+  ObjCCategoryDecl *
+  FindCategoryDeclaration(const IdentifierInfo *CategoryId) const;
 
   // Get the local instance/class method declared in a category.
   ObjCMethodDecl *getCategoryInstanceMethod(Selector Sel) const;
@@ -1794,9 +1795,9 @@ class ObjCInterfaceDecl : public ObjCContainerDecl
     data().CategoryList = category;
   }
 
-  ObjCPropertyDecl
-    *FindPropertyVisibleInPrimaryClass(IdentifierInfo *PropertyId,
-                                       ObjCPropertyQueryKind QueryKind) const;
+  ObjCPropertyDecl *
+  FindPropertyVisibleInPrimaryClass(const IdentifierInfo *PropertyId,
+                                    ObjCPropertyQueryKind QueryKind) const;
 
   void collectPropertiesToImplement(PropertyMap &PM) const override;
 
@@ -1954,8 +1955,8 @@ class ObjCIvarDecl : public FieldDecl {
 
 private:
   ObjCIvarDecl(ObjCContainerDecl *DC, SourceLocation StartLoc,
-               SourceLocation IdLoc, IdentifierInfo *Id,
-               QualType T, TypeSourceInfo *TInfo, AccessControl ac, Expr *BW,
+               SourceLocation IdLoc, const IdentifierInfo *Id, QualType T,
+               TypeSourceInfo *TInfo, AccessControl ac, Expr *BW,
                bool synthesized)
       : FieldDecl(ObjCIvar, DC, StartLoc, IdLoc, Id, T, TInfo, BW,
                   /*Mutable=*/false, /*HasInit=*/ICIS_NoInit),
@@ -1964,10 +1965,9 @@ class ObjCIvarDecl : public FieldDecl {
 public:
   static ObjCIvarDecl *Create(ASTContext &C, ObjCContainerDecl *DC,
                               SourceLocation StartLoc, SourceLocation IdLoc,
-                              IdentifierInfo *Id, QualType T,
-                              TypeSourceInfo *TInfo,
-                              AccessControl ac, Expr *BW = nullptr,
-                              bool synthesized=false);
+                              const IdentifierInfo *Id, QualType T,
+                              TypeSourceInfo *TInfo, AccessControl ac,
+                              Expr *BW = nullptr, bool synthesized = false);
 
   static ObjCIvarDecl *CreateDeserialized(ASTContext &C, unsigned ID);
 
@@ -2343,7 +2343,7 @@ class ObjCCategoryDecl : public ObjCContainerDecl {
 
   ObjCCategoryDecl(DeclContext *DC, SourceLocation AtLoc,
                    SourceLocation ClassNameLoc, SourceLocation CategoryNameLoc,
-                   IdentifierInfo *Id, ObjCInterfaceDecl *IDecl,
+                   const IdentifierInfo *Id, ObjCInterfaceDecl *IDecl,
                    ObjCTypeParamList *typeParamList,
                    SourceLocation IvarLBraceLoc = SourceLocation(),
                    SourceLocation IvarRBraceLoc = SourceLocation());
@@ -2354,15 +2354,13 @@ class ObjCCategoryDecl : public ObjCContainerDecl {
   friend class ASTDeclReader;
   friend class ASTDeclWriter;
 
-  static ObjCCategoryDecl *Create(ASTContext &C, DeclContext *DC,
-                                  SourceLocation AtLoc,
-                                  SourceLocation ClassNameLoc,
-                                  SourceLocation CategoryNameLoc,
-                                  IdentifierInfo *Id,
-                                  ObjCInterfaceDecl *IDecl,
-                                  ObjCTypeParamList *typeParamList,
-                                  SourceLocation IvarLBraceLoc=SourceLocation(),
-                                  SourceLocation IvarRBraceLoc=SourceLocation());
+  static ObjCCategoryDecl *
+  Create(ASTContext &C, DeclContext *DC, SourceLocation AtLoc,
+         SourceLocation ClassNameLoc, SourceLocation CategoryNameLoc,
+         const IdentifierInfo *Id, ObjCInterfaceDecl *IDecl,
+         ObjCTypeParamList *typeParamList,
+         SourceLocation IvarLBraceLoc = SourceLocation(),
+         SourceLocation IvarRBraceLoc = SourceLocation());
   static ObjCCategoryDecl *CreateDeserialized(ASTContext &C, unsigned ID);
 
   ObjCInterfaceDecl *getClassInterface() { return ClassInterface; }
@@ -2472,10 +2470,9 @@ class ObjCImplDecl : public ObjCContainerDecl {
   void anchor() override;
 
 protected:
-  ObjCImplDecl(Kind DK, DeclContext *DC,
-               ObjCInterfaceDecl *classInterface,
-               IdentifierInfo *Id,
-               SourceLocation nameLoc, SourceLocation atStartLoc)
+  ObjCImplDecl(Kind DK, DeclContext *DC, ObjCInterfaceDecl *classInterface,
+               const IdentifierInfo *Id, SourceLocation nameLoc,
+               SourceLocation atStartLoc)
       : ObjCContainerDecl(DK, DC, Id, nameLoc, atStartLoc),
         ClassInterface(classInterface) {}
 
@@ -2543,12 +2540,12 @@ class ObjCCategoryImplDecl : public ObjCImplDecl {
   // Category name location
   SourceLocation CategoryNameLoc;
 
-  ObjCCategoryImplDecl(DeclContext *DC, IdentifierInfo *Id,
+  ObjCCategoryImplDecl(DeclContext *DC, const IdentifierInfo *Id,
                        ObjCInterfaceDecl *classInterface,
                        SourceLocation nameLoc, SourceLocation atStartLoc,
                        SourceLocation CategoryNameLoc)
-      : ObjCImplDecl(ObjCCategoryImpl, DC, classInterface, Id,
-                     nameLoc, atStartLoc),
+      : ObjCImplDecl(ObjCCategoryImpl, DC, classInterface, Id, nameLoc,
+                     atStartLoc),
         CategoryNameLoc(CategoryNameLoc) {}
 
   void anchor() override;
@@ -2557,12 +2554,10 @@ class ObjCCategoryImplDecl : public ObjCImplDecl {
   friend class ASTDeclReader;
   friend class ASTDeclWriter;
 
-  static ObjCCategoryImplDecl *Create(ASTContext &C, DeclContext *DC,
-                                      IdentifierInfo *Id,
-                                      ObjCInterfaceDecl *classInterface,
-                                      SourceLocation nameLoc,
-                                      SourceLocation atStartLoc,
-                                      SourceLocation CategoryNameLoc);
+  static ObjCCategoryImplDecl *
+  Create(ASTContext &C, DeclContext *DC, const IdentifierInfo *Id,
+         ObjCInterfaceDecl *classInterface, SourceLocation nameLoc,
+         SourceLocation atStartLoc, SourceLocation CategoryNameLoc);
   static ObjCCategoryImplDecl *CreateDeserialized(ASTContext &C, unsigned ID);
 
   ObjCCategoryDecl *getCategoryDecl() const;

diff --git a/clang/include/clang/AST/DeclTemplate.h b/clang/include/clang/AST/DeclTemplate.h
@@ -1389,27 +1389,27 @@ class NonTypeTemplateParmDecl final
 
   NonTypeTemplateParmDecl(DeclContext *DC, SourceLocation StartLoc,
                           SourceLocation IdLoc, unsigned D, unsigned P,
-                          IdentifierInfo *Id, QualType T,
+                          const IdentifierInfo *Id, QualType T,
                           bool ParameterPack, TypeSourceInfo *TInfo)
       : DeclaratorDecl(NonTypeTemplateParm, DC, IdLoc, Id, T, TInfo, StartLoc),
         TemplateParmPosition(D, P), ParameterPack(ParameterPack) {}
 
   NonTypeTemplateParmDecl(DeclContext *DC, SourceLocation StartLoc,
                           SourceLocation IdLoc, unsigned D, unsigned P,
-                          IdentifierInfo *Id, QualType T,
+                          const IdentifierInfo *Id, QualType T,
                           TypeSourceInfo *TInfo,
                           ArrayRef<QualType> ExpandedTypes,
                           ArrayRef<TypeSourceInfo *> ExpandedTInfos);
 
 public:
   static NonTypeTemplateParmDecl *
   Create(const ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
-         SourceLocation IdLoc, unsigned D, unsigned P, IdentifierInfo *Id,
+         SourceLocation IdLoc, unsigned D, unsigned P, const IdentifierInfo *Id,
          QualType T, bool ParameterPack, TypeSourceInfo *TInfo);
 
   static NonTypeTemplateParmDecl *
   Create(const ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
-         SourceLocation IdLoc, unsigned D, unsigned P, IdentifierInfo *Id,
+         SourceLocation IdLoc, unsigned D, unsigned P, const IdentifierInfo *Id,
          QualType T, TypeSourceInfo *TInfo, ArrayRef<QualType> ExpandedTypes,
          ArrayRef<TypeSourceInfo *> ExpandedTInfos);
 
@@ -1581,26 +1581,36 @@ class TemplateTemplateParmDecl final
       DefaultArgStorage<TemplateTemplateParmDecl, TemplateArgumentLoc *>;
   DefArgStorage DefaultArgument;
 
+  /// Whether this template template parameter was declaration with
+  /// the 'typename' keyword.
+  ///
+  /// If false, it was declared with the 'class' keyword.
+  LLVM_PREFERRED_TYPE(bool)
+  unsigned Typename : 1;
+
   /// Whether this parameter is a parameter pack.
-  bool ParameterPack;
+  LLVM_PREFERRED_TYPE(bool)
+  unsigned ParameterPack : 1;
 
   /// Whether this template template parameter is an "expanded"
   /// parameter pack, meaning that it is a pack expansion and we
   /// already know the set of template parameters that expansion expands to.
-  bool ExpandedParameterPack = false;
+  LLVM_PREFERRED_TYPE(bool)
+  unsigned ExpandedParameterPack : 1;
 
   /// The number of parameters in an expanded parameter pack.
   unsigned NumExpandedParams = 0;
 
-  TemplateTemplateParmDecl(DeclContext *DC, SourceLocation L,
-                           unsigned D, unsigned P, bool ParameterPack,
-                           IdentifierInfo *Id, TemplateParameterList *Params)
+  TemplateTemplateParmDecl(DeclContext *DC, SourceLocation L, unsigned D,
+                           unsigned P, bool ParameterPack, IdentifierInfo *Id,
+                           bool Typename, TemplateParameterList *Params)
       : TemplateDecl(TemplateTemplateParm, DC, L, Id, Params),
-        TemplateParmPosition(D, P), ParameterPack(ParameterPack) {}
+        TemplateParmPosition(D, P), Typename(Typename),
+        ParameterPack(ParameterPack), ExpandedParameterPack(false) {}
 
-  TemplateTemplateParmDecl(DeclContext *DC, SourceLocation L,
-                           unsigned D, unsigned P,
-                           IdentifierInfo *Id, TemplateParameterList *Params,
+  TemplateTemplateParmDecl(DeclContext *DC, SourceLocation L, unsigned D,
+                           unsigned P, IdentifierInfo *Id, bool Typename,
+                           TemplateParameterList *Params,
                            ArrayRef<TemplateParameterList *> Expansions);
 
   void anchor() override;
@@ -1613,14 +1623,13 @@ class TemplateTemplateParmDecl final
   static TemplateTemplateParmDecl *Create(const ASTContext &C, DeclContext *DC,
                                           SourceLocation L, unsigned D,
                                           unsigned P, bool ParameterPack,
-                                          IdentifierInfo *Id,
+                                          IdentifierInfo *Id, bool Typename,
                                           TemplateParameterList *Params);
-  static TemplateTemplateParmDecl *Create(const ASTContext &C, DeclContext *DC,
-                                          SourceLocation L, unsigned D,
-                                          unsigned P,
-                                          IdentifierInfo *Id,
-                                          TemplateParameterList *Params,
-                                 ArrayRef<TemplateParameterList *> Expansions);
+  static TemplateTemplateParmDecl *
+  Create(const ASTContext &C, DeclContext *DC, SourceLocation L, unsigned D,
+         unsigned P, IdentifierInfo *Id, bool Typename,
+         TemplateParameterList *Params,
+         ArrayRef<TemplateParameterList *> Expansions);
 
   static TemplateTemplateParmDecl *CreateDeserialized(ASTContext &C,
                                                       unsigned ID);
@@ -1634,6 +1643,14 @@ class TemplateTemplateParmDecl final
   using TemplateParmPosition::setPosition;
   using TemplateParmPosition::getIndex;
 
+  /// Whether this template template parameter was declared with
+  /// the 'typename' keyword.
+  bool wasDeclaredWithTypename() const { return Typename; }
+
+  /// Set whether this template template parameter was declared with
+  /// the 'typename' or 'class' keyword.
+  void setDeclaredWithTypename(bool withTypename) { Typename = withTypename; }
+
   /// Whether this template template parameter is a template
   /// parameter pack.
   ///

diff --git a/clang/include/clang/AST/ExprCXX.h b/clang/include/clang/AST/ExprCXX.h
@@ -1149,6 +1149,7 @@ class CXXThisExpr : public Expr {
   CXXThisExpr(SourceLocation L, QualType Ty, bool IsImplicit, ExprValueKind VK)
       : Expr(CXXThisExprClass, Ty, VK, OK_Ordinary) {
     CXXThisExprBits.IsImplicit = IsImplicit;
+    CXXThisExprBits.CapturedByCopyInLambdaWithExplicitObjectParameter = false;
     CXXThisExprBits.Loc = L;
     setDependence(computeDependence(this));
   }
@@ -1170,6 +1171,15 @@ class CXXThisExpr : public Expr {
   bool isImplicit() const { return CXXThisExprBits.IsImplicit; }
   void setImplicit(bool I) { CXXThisExprBits.IsImplicit = I; }
 
+  bool isCapturedByCopyInLambdaWithExplicitObjectParameter() const {
+    return CXXThisExprBits.CapturedByCopyInLambdaWithExplicitObjectParameter;
+  }
+
+  void setCapturedByCopyInLambdaWithExplicitObjectParameter(bool Set) {
+    CXXThisExprBits.CapturedByCopyInLambdaWithExplicitObjectParameter = Set;
+    setDependence(computeDependence(this));
+  }
+
   static bool classof(const Stmt *T) {
     return T->getStmtClass() == CXXThisExprClass;
   }
@@ -2549,15 +2559,15 @@ class CXXDeleteExpr : public Expr {
 class PseudoDestructorTypeStorage {
   /// Either the type source information or the name of the type, if
   /// it couldn't be resolved due to type-dependence.
-  llvm::PointerUnion<TypeSourceInfo *, IdentifierInfo *> Type;
+  llvm::PointerUnion<TypeSourceInfo *, const IdentifierInfo *> Type;
 
   /// The starting source location of the pseudo-destructor type.
   SourceLocation Location;
 
 public:
   PseudoDestructorTypeStorage() = default;
 
-  PseudoDestructorTypeStorage(IdentifierInfo *II, SourceLocation Loc)
+  PseudoDestructorTypeStorage(const IdentifierInfo *II, SourceLocation Loc)
       : Type(II), Location(Loc) {}
 
   PseudoDestructorTypeStorage(TypeSourceInfo *Info);
@@ -2566,8 +2576,8 @@ class PseudoDestructorTypeStorage {
     return Type.dyn_cast<TypeSourceInfo *>();
   }
 
-  IdentifierInfo *getIdentifier() const {
-    return Type.dyn_cast<IdentifierInfo *>();
+  const IdentifierInfo *getIdentifier() const {
+    return Type.dyn_cast<const IdentifierInfo *>();
   }
 
   SourceLocation getLocation() const { return Location; }
@@ -2698,7 +2708,7 @@ class CXXPseudoDestructorExpr : public Expr {
   /// In a dependent pseudo-destructor expression for which we do not
   /// have full type information on the destroyed type, provides the name
   /// of the destroyed type.
-  IdentifierInfo *getDestroyedTypeIdentifier() const {
+  const IdentifierInfo *getDestroyedTypeIdentifier() const {
     return DestroyedType.getIdentifier();
   }
 

diff --git a/clang/include/clang/AST/ExternalASTSource.h b/clang/include/clang/AST/ExternalASTSource.h
@@ -138,7 +138,7 @@ class ExternalASTSource : public RefCountedBase<ExternalASTSource> {
   virtual CXXBaseSpecifier *GetExternalCXXBaseSpecifiers(uint64_t Offset);
 
   /// Update an out-of-date identifier.
-  virtual void updateOutOfDateIdentifier(IdentifierInfo &II) {}
+  virtual void updateOutOfDateIdentifier(const IdentifierInfo &II) {}
 
   /// Find all declarations with the given name in the given context,
   /// and add them to the context by calling SetExternalVisibleDeclsForName

diff --git a/clang/include/clang/AST/JSONNodeDumper.h b/clang/include/clang/AST/JSONNodeDumper.h
@@ -310,6 +310,8 @@ class JSONNodeDumper
   void VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *MTE);
   void VisitCXXDependentScopeMemberExpr(const CXXDependentScopeMemberExpr *ME);
   void VisitRequiresExpr(const RequiresExpr *RE);
+  void VisitCXXDefaultArgExpr(const CXXDefaultArgExpr *Node);
+  void VisitCXXDefaultInitExpr(const CXXDefaultInitExpr *Node);
 
   void VisitObjCEncodeExpr(const ObjCEncodeExpr *OEE);
   void VisitObjCMessageExpr(const ObjCMessageExpr *OME);

diff --git a/clang/include/clang/AST/NestedNameSpecifier.h b/clang/include/clang/AST/NestedNameSpecifier.h
@@ -124,7 +124,7 @@ class NestedNameSpecifier : public llvm::FoldingSetNode {
   /// cannot be resolved.
   static NestedNameSpecifier *Create(const ASTContext &Context,
                                      NestedNameSpecifier *Prefix,
-                                     IdentifierInfo *II);
+                                     const IdentifierInfo *II);
 
   /// Builds a nested name specifier that names a namespace.
   static NestedNameSpecifier *Create(const ASTContext &Context,
@@ -134,7 +134,7 @@ class NestedNameSpecifier : public llvm::FoldingSetNode {
   /// Builds a nested name specifier that names a namespace alias.
   static NestedNameSpecifier *Create(const ASTContext &Context,
                                      NestedNameSpecifier *Prefix,
-                                     NamespaceAliasDecl *Alias);
+                                     const NamespaceAliasDecl *Alias);
 
   /// Builds a nested name specifier that names a type.
   static NestedNameSpecifier *Create(const ASTContext &Context,
@@ -148,7 +148,7 @@ class NestedNameSpecifier : public llvm::FoldingSetNode {
   /// nested name specifier, e.g., in "x->Base::f", the "x" has a dependent
   /// type.
   static NestedNameSpecifier *Create(const ASTContext &Context,
-                                     IdentifierInfo *II);
+                                     const IdentifierInfo *II);
 
   /// Returns the nested name specifier representing the global
   /// scope.

diff --git a/clang/include/clang/AST/OpenACCClause.h b/clang/include/clang/AST/OpenACCClause.h
@@ -14,6 +14,7 @@
 #ifndef LLVM_CLANG_AST_OPENACCCLAUSE_H
 #define LLVM_CLANG_AST_OPENACCCLAUSE_H
 #include "clang/AST/ASTContext.h"
+#include "clang/AST/StmtIterator.h"
 #include "clang/Basic/OpenACCKinds.h"
 
 namespace clang {
@@ -34,6 +35,17 @@ class OpenACCClause {
 
   static bool classof(const OpenACCClause *) { return true; }
 
+  using child_iterator = StmtIterator;
+  using const_child_iterator = ConstStmtIterator;
+  using child_range = llvm::iterator_range<child_iterator>;
+  using const_child_range = llvm::iterator_range<const_child_iterator>;
+
+  child_range children();
+  const_child_range children() const {
+    auto Children = const_cast<OpenACCClause *>(this)->children();
+    return const_child_range(Children.begin(), Children.end());
+  }
+
   virtual ~OpenACCClause() = default;
 };
 
@@ -49,6 +61,88 @@ class OpenACCClauseWithParams : public OpenACCClause {
 
 public:
   SourceLocation getLParenLoc() const { return LParenLoc; }
+
+  child_range children() {
+    return child_range(child_iterator(), child_iterator());
+  }
+  const_child_range children() const {
+    return const_child_range(const_child_iterator(), const_child_iterator());
+  }
+};
+
+/// A 'default' clause, has the optional 'none' or 'present' argument.
+class OpenACCDefaultClause : public OpenACCClauseWithParams {
+  friend class ASTReaderStmt;
+  friend class ASTWriterStmt;
+
+  OpenACCDefaultClauseKind DefaultClauseKind;
+
+protected:
+  OpenACCDefaultClause(OpenACCDefaultClauseKind K, SourceLocation BeginLoc,
+                       SourceLocation LParenLoc, SourceLocation EndLoc)
+      : OpenACCClauseWithParams(OpenACCClauseKind::Default, BeginLoc, LParenLoc,
+                                EndLoc),
+        DefaultClauseKind(K) {
+    assert((DefaultClauseKind == OpenACCDefaultClauseKind::None ||
+            DefaultClauseKind == OpenACCDefaultClauseKind::Present) &&
+           "Invalid Clause Kind");
+  }
+
+public:
+  OpenACCDefaultClauseKind getDefaultClauseKind() const {
+    return DefaultClauseKind;
+  }
+
+  static OpenACCDefaultClause *Create(const ASTContext &C,
+                                      OpenACCDefaultClauseKind K,
+                                      SourceLocation BeginLoc,
+                                      SourceLocation LParenLoc,
+                                      SourceLocation EndLoc);
+};
+
+/// Represents one of the handful of classes that has an optional/required
+/// 'condition' expression as an argument.
+class OpenACCClauseWithCondition : public OpenACCClauseWithParams {
+  Expr *ConditionExpr = nullptr;
+
+protected:
+  OpenACCClauseWithCondition(OpenACCClauseKind K, SourceLocation BeginLoc,
+                             SourceLocation LParenLoc, Expr *ConditionExpr,
+                             SourceLocation EndLoc)
+      : OpenACCClauseWithParams(K, BeginLoc, LParenLoc, EndLoc),
+        ConditionExpr(ConditionExpr) {}
+
+public:
+  bool hasConditionExpr() const { return ConditionExpr; }
+  const Expr *getConditionExpr() const { return ConditionExpr; }
+  Expr *getConditionExpr() { return ConditionExpr; }
+
+  child_range children() {
+    if (ConditionExpr)
+      return child_range(reinterpret_cast<Stmt **>(&ConditionExpr),
+                         reinterpret_cast<Stmt **>(&ConditionExpr + 1));
+    return child_range(child_iterator(), child_iterator());
+  }
+
+  const_child_range children() const {
+    if (ConditionExpr)
+      return const_child_range(
+          reinterpret_cast<Stmt *const *>(&ConditionExpr),
+          reinterpret_cast<Stmt *const *>(&ConditionExpr + 1));
+    return const_child_range(const_child_iterator(), const_child_iterator());
+  }
+};
+
+/// An 'if' clause, which has a required condition expression.
+class OpenACCIfClause : public OpenACCClauseWithCondition {
+protected:
+  OpenACCIfClause(SourceLocation BeginLoc, SourceLocation LParenLoc,
+                  Expr *ConditionExpr, SourceLocation EndLoc);
+
+public:
+  static OpenACCIfClause *Create(const ASTContext &C, SourceLocation BeginLoc,
+                                 SourceLocation LParenLoc, Expr *ConditionExpr,
+                                 SourceLocation EndLoc);
 };
 
 template <class Impl> class OpenACCClauseVisitor {
@@ -66,6 +160,11 @@ template <class Impl> class OpenACCClauseVisitor {
 
     switch (C->getClauseKind()) {
     case OpenACCClauseKind::Default:
+      VisitDefaultClause(*cast<OpenACCDefaultClause>(C));
+      return;
+    case OpenACCClauseKind::If:
+      VisitIfClause(*cast<OpenACCIfClause>(C));
+      return;
     case OpenACCClauseKind::Finalize:
     case OpenACCClauseKind::IfPresent:
     case OpenACCClauseKind::Seq:
@@ -74,7 +173,6 @@ template <class Impl> class OpenACCClauseVisitor {
     case OpenACCClauseKind::Worker:
     case OpenACCClauseKind::Vector:
     case OpenACCClauseKind::NoHost:
-    case OpenACCClauseKind::If:
     case OpenACCClauseKind::Self:
     case OpenACCClauseKind::Copy:
     case OpenACCClauseKind::UseDevice:
@@ -112,6 +210,14 @@ template <class Impl> class OpenACCClauseVisitor {
     }
     llvm_unreachable("Invalid Clause kind");
   }
+
+#define VISIT_CLAUSE(CLAUSE_NAME)                                              \
+  void Visit##CLAUSE_NAME##Clause(                                             \
+      const OpenACC##CLAUSE_NAME##Clause &Clause) {                            \
+    return getDerived().Visit##CLAUSE_NAME##Clause(Clause);                    \
+  }
+
+#include "clang/Basic/OpenACCClauses.def"
 };
 
 class OpenACCClausePrinter final
@@ -128,6 +234,10 @@ class OpenACCClausePrinter final
     }
   }
   OpenACCClausePrinter(raw_ostream &OS) : OS(OS) {}
+
+#define VISIT_CLAUSE(CLAUSE_NAME)                                              \
+  void Visit##CLAUSE_NAME##Clause(const OpenACC##CLAUSE_NAME##Clause &Clause);
+#include "clang/Basic/OpenACCClauses.def"
 };
 
 } // namespace clang

diff --git a/clang/include/clang/AST/Stmt.h b/clang/include/clang/AST/Stmt.h
@@ -784,6 +784,11 @@ class alignas(void *) Stmt {
     LLVM_PREFERRED_TYPE(bool)
     unsigned IsImplicit : 1;
 
+    /// Whether there is a lambda with an explicit object parameter that
+    /// captures this "this" by copy.
+    LLVM_PREFERRED_TYPE(bool)
+    unsigned CapturedByCopyInLambdaWithExplicitObjectParameter : 1;
+
     /// The location of the "this".
     SourceLocation Loc;
   };

diff --git a/clang/include/clang/AST/StmtOpenMP.h b/clang/include/clang/AST/StmtOpenMP.h
@@ -6109,6 +6109,8 @@ class OMPTeamsGenericLoopDirective final : public OMPLoopDirective {
 class OMPTargetTeamsGenericLoopDirective final : public OMPLoopDirective {
   friend class ASTStmtReader;
   friend class OMPExecutableDirective;
+  /// true if loop directive's associated loop can be a parallel for.
+  bool CanBeParallelFor = false;
   /// Build directive with the given start and end location.
   ///
   /// \param StartLoc Starting location of the directive kind.
@@ -6131,6 +6133,9 @@ class OMPTargetTeamsGenericLoopDirective final : public OMPLoopDirective {
                          llvm::omp::OMPD_target_teams_loop, SourceLocation(),
                          SourceLocation(), CollapsedNum) {}
 
+  /// Set whether associated loop can be a parallel for.
+  void setCanBeParallelFor(bool ParFor) { CanBeParallelFor = ParFor; }
+
 public:
   /// Creates directive with a list of \p Clauses.
   ///
@@ -6145,7 +6150,7 @@ class OMPTargetTeamsGenericLoopDirective final : public OMPLoopDirective {
   static OMPTargetTeamsGenericLoopDirective *
   Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation EndLoc,
          unsigned CollapsedNum, ArrayRef<OMPClause *> Clauses,
-         Stmt *AssociatedStmt, const HelperExprs &Exprs);
+         Stmt *AssociatedStmt, const HelperExprs &Exprs, bool CanBeParallelFor);
 
   /// Creates an empty directive with the place
   /// for \a NumClauses clauses.
@@ -6159,6 +6164,10 @@ class OMPTargetTeamsGenericLoopDirective final : public OMPLoopDirective {
                                                          unsigned CollapsedNum,
                                                          EmptyShell);
 
+  /// Return true if current loop directive's associated loop can be a
+  /// parallel for.
+  bool canBeParallelFor() const { return CanBeParallelFor; }
+
   static bool classof(const Stmt *T) {
     return T->getStmtClass() == OMPTargetTeamsGenericLoopDirectiveClass;
   }

diff --git a/clang/include/clang/ASTMatchers/ASTMatchers.h b/clang/include/clang/ASTMatchers/ASTMatchers.h
@@ -4961,6 +4961,8 @@ AST_MATCHER_P(LambdaExpr, hasAnyCapture, internal::Matcher<LambdaCapture>,
 /// capturesVar(hasName("x")) matches `x` and `x = 1`.
 AST_MATCHER_P(LambdaCapture, capturesVar, internal::Matcher<ValueDecl>,
               InnerMatcher) {
+  if (!Node.capturesVariable())
+    return false;
   auto *capturedVar = Node.getCapturedVar();
   return capturedVar && InnerMatcher.matches(*capturedVar, Finder, Builder);
 }

diff --git a/clang/include/clang/Analysis/FlowSensitive/ControlFlowContext.h b/clang/include/clang/Analysis/FlowSensitive/ControlFlowContext.h
diff --git a/clang/include/clang/Analysis/FlowSensitive/DataflowEnvironment.h b/clang/include/clang/Analysis/FlowSensitive/DataflowEnvironment.h
@@ -30,6 +30,7 @@
 #include "llvm/ADT/MapVector.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/ErrorHandling.h"
+#include <memory>
 #include <type_traits>
 #include <utility>
 
@@ -344,17 +345,6 @@ class Environment {
   /// location of the result object to pass in `this`, even though prvalues are
   /// otherwise not associated with storage locations.
   ///
-  /// FIXME: Currently, this simply returns a stable storage location for `E`,
-  /// but this doesn't do the right thing in scenarios like the following:
-  /// ```
-  /// MyClass c = some_condition()? MyClass(foo) : MyClass(bar);
-  /// ```
-  /// Here, `MyClass(foo)` and `MyClass(bar)` will have two different storage
-  /// locations, when in fact their storage locations should be the same.
-  /// Eventually, we want to propagate storage locations from result objects
-  /// down to the prvalues that initialize them, similar to the way that this is
-  /// done in Clang's CodeGen.
-  ///
   /// Requirements:
   ///  `E` must be a prvalue of record type.
   RecordStorageLocation &
@@ -462,7 +452,13 @@ class Environment {
   /// Initializes the fields (including synthetic fields) of `Loc` with values,
   /// unless values of the field type are not supported or we hit one of the
   /// limits at which we stop producing values.
-  void initializeFieldsWithValues(RecordStorageLocation &Loc);
+  /// If `Type` is provided, initializes only those fields that are modeled for
+  /// `Type`; this is intended for use in cases where `Loc` is a derived type
+  /// and we only want to initialize the fields of a base type.
+  void initializeFieldsWithValues(RecordStorageLocation &Loc, QualType Type);
+  void initializeFieldsWithValues(RecordStorageLocation &Loc) {
+    initializeFieldsWithValues(Loc, Loc.getType());
+  }
 
   /// Assigns `Val` as the value of `Loc` in the environment.
   void setValue(const StorageLocation &Loc, Value &Val);
@@ -653,6 +649,9 @@ class Environment {
   LLVM_DUMP_METHOD void dump(raw_ostream &OS) const;
 
 private:
+  using PrValueToResultObject =
+      llvm::DenseMap<const Expr *, RecordStorageLocation *>;
+
   // The copy-constructor is for use in fork() only.
   Environment(const Environment &) = default;
 
@@ -682,8 +681,10 @@ class Environment {
   /// Initializes the fields (including synthetic fields) of `Loc` with values,
   /// unless values of the field type are not supported or we hit one of the
   /// limits at which we stop producing values (controlled by `Visited`,
-  /// `Depth`, and `CreatedValuesCount`).
-  void initializeFieldsWithValues(RecordStorageLocation &Loc,
+  /// `Depth`, and `CreatedValuesCount`). If `Type` is different from
+  /// `Loc.getType()`, initializes only those fields that are modeled for
+  /// `Type`.
+  void initializeFieldsWithValues(RecordStorageLocation &Loc, QualType Type,
                                   llvm::DenseSet<QualType> &Visited, int Depth,
                                   int &CreatedValuesCount);
 
@@ -702,22 +703,45 @@ class Environment {
   /// and functions referenced in `FuncDecl`. `FuncDecl` must have a body.
   void initFieldsGlobalsAndFuncs(const FunctionDecl *FuncDecl);
 
+  static PrValueToResultObject
+  buildResultObjectMap(DataflowAnalysisContext *DACtx,
+                       const FunctionDecl *FuncDecl,
+                       RecordStorageLocation *ThisPointeeLoc,
+                       RecordStorageLocation *LocForRecordReturnVal);
+
   // `DACtx` is not null and not owned by this object.
   DataflowAnalysisContext *DACtx;
 
-  // FIXME: move the fields `CallStack`, `ReturnVal`, `ReturnLoc` and
-  // `ThisPointeeLoc` into a separate call-context object, shared between
-  // environments in the same call.
+  // FIXME: move the fields `CallStack`, `ResultObjectMap`, `ReturnVal`,
+  // `ReturnLoc` and `ThisPointeeLoc` into a separate call-context object,
+  // shared between environments in the same call.
   // https://github.com/llvm/llvm-project/issues/59005
 
   // `DeclContext` of the block being analysed if provided.
   std::vector<const DeclContext *> CallStack;
 
-  // Value returned by the function (if it has non-reference return type).
+  // Maps from prvalues of record type to their result objects. Shared between
+  // all environments for the same function.
+  // FIXME: It's somewhat unsatisfactory that we have to use a `shared_ptr`
+  // here, though the cost is acceptable: The overhead of a `shared_ptr` is
+  // incurred when it is copied, and this happens only relatively rarely (when
+  // we fork the environment). The need for a `shared_ptr` will go away once we
+  // introduce a shared call-context object (see above).
+  std::shared_ptr<PrValueToResultObject> ResultObjectMap;
+
+  // The following three member variables handle various different types of
+  // return values.
+  // - If the return type is not a reference and not a record: Value returned
+  //   by the function.
   Value *ReturnVal = nullptr;
-  // Storage location of the reference returned by the function (if it has
-  // reference return type).
+  // - If the return type is a reference: Storage location of the reference
+  //   returned by the function.
   StorageLocation *ReturnLoc = nullptr;
+  // - If the return type is a record or the function being analyzed is a
+  //   constructor: Storage location into which the return value should be
+  //   constructed.
+  RecordStorageLocation *LocForRecordReturnVal = nullptr;
+
   // The storage location of the `this` pointee. Should only be null if the
   // function being analyzed is only a function and not a method.
   RecordStorageLocation *ThisPointeeLoc = nullptr;

diff --git a/clang/include/clang/Analysis/SelectorExtras.h b/clang/include/clang/Analysis/SelectorExtras.h
@@ -15,10 +15,10 @@ namespace clang {
 
 template <typename... IdentifierInfos>
 static inline Selector getKeywordSelector(ASTContext &Ctx,
-                                          IdentifierInfos *... IIs) {
+                                          const IdentifierInfos *...IIs) {
   static_assert(sizeof...(IdentifierInfos) > 0,
                 "keyword selectors must have at least one argument");
-  SmallVector<IdentifierInfo *, 10> II({&Ctx.Idents.get(IIs)...});
+  SmallVector<const IdentifierInfo *, 10> II({&Ctx.Idents.get(IIs)...});
 
   return Ctx.Selectors.getSelector(II.size(), &II[0]);
 }

diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td
@@ -324,13 +324,10 @@ class Spelling<string name, string variety, int version = 1> {
 }
 
 class GNU<string name> : Spelling<name, "GNU">;
-class Declspec<string name> : Spelling<name, "Declspec"> {
-  bit PrintOnLeft = 1;
-}
+class Declspec<string name> : Spelling<name, "Declspec">;
 class Microsoft<string name> : Spelling<name, "Microsoft">;
 class CXX11<string namespace, string name, int version = 1>
     : Spelling<name, "CXX11", version> {
-  bit CanPrintOnLeft = 0;
   string Namespace = namespace;
 }
 class C23<string namespace, string name, int version = 1>
@@ -596,12 +593,6 @@ class AttrSubjectMatcherAggregateRule<AttrSubject subject> {
 def SubjectMatcherForNamed : AttrSubjectMatcherAggregateRule<Named>;
 
 class Attr {
-  // Specifies that when printed, this attribute is meaningful on the
-  // 'left side' of the declaration.
-  bit CanPrintOnLeft = 1;
-  // Specifies that when printed, this attribute is required to be printed on
-  // the 'left side' of the declaration.
-  bit PrintOnLeft = 0;
   // The various ways in which an attribute can be spelled in source
   list<Spelling> Spellings;
   // The things to which an attribute can appertain
@@ -937,7 +928,6 @@ def AVRSignal : InheritableAttr, TargetSpecificAttr<TargetAVR> {
 }
 
 def AsmLabel : InheritableAttr {
-  let CanPrintOnLeft = 0;
   let Spellings = [CustomKeyword<"asm">, CustomKeyword<"__asm__">];
   let Args = [
     // Label specifies the mangled name for the decl.
@@ -1534,7 +1524,6 @@ def AllocSize : InheritableAttr {
 }
 
 def EnableIf : InheritableAttr {
-  let CanPrintOnLeft = 0;
   // Does not have a [[]] spelling because this attribute requires the ability
   // to parse function arguments but the attribute is not written in the type
   // position.
@@ -3171,7 +3160,6 @@ def Unavailable : InheritableAttr {
 }
 
 def DiagnoseIf : InheritableAttr {
-  let CanPrintOnLeft = 0;
   // Does not have a [[]] spelling because this attribute requires the ability
   // to parse function arguments but the attribute is not written in the type
   // position.

diff --git a/clang/include/clang/Basic/AttrDocs.td b/clang/include/clang/Basic/AttrDocs.td
@@ -1604,27 +1604,40 @@ specifies availability for the current target platform, the availability
 attributes are ignored. Supported platforms are:
 
 ``ios``
-  Apple's iOS operating system. The minimum deployment target is specified by
-  the ``-mios-version-min=*version*`` or ``-miphoneos-version-min=*version*``
-  command-line arguments.
+  Apple's iOS operating system. The minimum deployment target is specified
+  as part of the ``-target *arch*-apple-ios*version*`` command line argument.
+  Alternatively, it can be specified by the ``-mtargetos=ios*version*``
+  command-line argument.
 
 ``macos``
-  Apple's macOS operating system. The minimum deployment target is
-  specified by the ``-mmacosx-version-min=*version*`` command-line argument.
-  ``macosx`` is supported for backward-compatibility reasons, but it is
-  deprecated.
+  Apple's macOS operating system. The minimum deployment target is specified
+  as part of the ``-target *arch*-apple-macos*version*`` command line argument.
+  Alternatively, it can be specified by the ``-mtargetos=macos*version*``
+  command-line argument. ``macosx`` is supported for
+  backward-compatibility reasons, but it is deprecated.
 
 ``tvos``
-  Apple's tvOS operating system. The minimum deployment target is specified by
-  the ``-mtvos-version-min=*version*`` command-line argument.
+  Apple's tvOS operating system. The minimum deployment target is specified
+  as part of the ``-target *arch*-apple-tvos*version*`` command line argument.
+  Alternatively, it can be specified by the ``-mtargetos=tvos*version*``
+  command-line argument.
 
 ``watchos``
-  Apple's watchOS operating system. The minimum deployment target is specified by
-  the ``-mwatchos-version-min=*version*`` command-line argument.
+  Apple's watchOS operating system. The minimum deployment target is specified
+  as part of the ``-target *arch*-apple-watchos*version*`` command line argument.
+  Alternatively, it can be specified by the ``-mtargetos=watchos*version*``
+  command-line argument.
+
+``visionos``
+  Apple's visionOS operating system. The minimum deployment target is specified
+  as part of the ``-target *arch*-apple-visionos*version*`` command line argument.
+  Alternatively, it can be specified by the ``-mtargetos=visionos*version*``
+  command-line argument.
 
 ``driverkit``
   Apple's DriverKit userspace kernel extensions. The minimum deployment target
-  is specified as part of the triple.
+  is specified as part of the ``-target *arch*-apple-driverkit*version*``
+  command line argument.
 
 A declaration can typically be used even when deploying back to a platform
 version prior to when the declaration was introduced. When this happens, the
@@ -7509,7 +7522,7 @@ means that it can e.g no longer be part of an initializer expression.
 
       /* This may print something else than "6 * 7 = 42",
          if there is a non-weak definition of "ANSWER" in
-	 an object linked in */
+         an object linked in */
       printf("6 * 7 = %d\n", ANSWER);
 
       return 0;

diff --git a/clang/include/clang/Basic/BuiltinsAMDGPU.def b/clang/include/clang/Basic/BuiltinsAMDGPU.def
@@ -61,6 +61,7 @@ BUILTIN(__builtin_amdgcn_s_waitcnt, "vIi", "n")
 BUILTIN(__builtin_amdgcn_s_sendmsg, "vIiUi", "n")
 BUILTIN(__builtin_amdgcn_s_sendmsghalt, "vIiUi", "n")
 BUILTIN(__builtin_amdgcn_s_barrier, "v", "n")
+BUILTIN(__builtin_amdgcn_s_ttracedata, "vi", "n")
 BUILTIN(__builtin_amdgcn_wave_barrier, "v", "n")
 BUILTIN(__builtin_amdgcn_sched_barrier, "vIi", "n")
 BUILTIN(__builtin_amdgcn_sched_group_barrier, "vIiIiIi", "n")
@@ -267,6 +268,7 @@ TARGET_BUILTIN(__builtin_amdgcn_dot4_f32_bf8_bf8, "fUiUif", "nc", "dot11-insts")
 TARGET_BUILTIN(__builtin_amdgcn_permlane16, "UiUiUiUiUiIbIb", "nc", "gfx10-insts")
 TARGET_BUILTIN(__builtin_amdgcn_permlanex16, "UiUiUiUiUiIbIb", "nc", "gfx10-insts")
 TARGET_BUILTIN(__builtin_amdgcn_mov_dpp8, "UiUiIUi", "nc", "gfx10-insts")
+TARGET_BUILTIN(__builtin_amdgcn_s_ttracedata_imm, "vIs", "n", "gfx10-insts")
 
 //===----------------------------------------------------------------------===//
 // Raytracing builtins.

diff --git a/clang/include/clang/Basic/CMakeLists.txt b/clang/include/clang/Basic/CMakeLists.txt
@@ -31,16 +31,6 @@ clang_tablegen(AttrList.inc -gen-clang-attr-list
   SOURCE Attr.td
   TARGET ClangAttrList)
 
-clang_tablegen(AttrLeftSideCanPrintList.inc -gen-clang-attr-can-print-left-list
-  -I ${CMAKE_CURRENT_SOURCE_DIR}/../../
-  SOURCE Attr.td
-  TARGET ClangAttrCanPrintLeftList)
-
-clang_tablegen(AttrLeftSideMustPrintList.inc -gen-clang-attr-must-print-left-list
-  -I ${CMAKE_CURRENT_SOURCE_DIR}/../../
-  SOURCE Attr.td
-  TARGET ClangAttrMustPrintLeftList)
-
 clang_tablegen(AttrSubMatchRulesList.inc -gen-clang-attr-subject-match-rule-list
   -I ${CMAKE_CURRENT_SOURCE_DIR}/../../
   SOURCE Attr.td

diff --git a/clang/include/clang/Basic/Cuda.h b/clang/include/clang/Basic/Cuda.h
@@ -50,6 +50,10 @@ const char *CudaVersionToString(CudaVersion V);
 // Input is "Major.Minor"
 CudaVersion CudaStringToVersion(const llvm::Twine &S);
 
+// We have a name conflict with sys/mac.h on AIX
+#ifdef SM_32
+#undef SM_32
+#endif
 enum class CudaArch {
   UNUSED,
   UNKNOWN,
@@ -126,6 +130,14 @@ enum class CudaArch {
   HIPDefault = CudaArch::GFX906,
 };
 
+enum class CUDAFunctionTarget {
+  Device,
+  Global,
+  Host,
+  HostDevice,
+  InvalidTarget
+};
+
 static inline bool IsNVIDIAGpuArch(CudaArch A) {
   return A >= CudaArch::SM_20 && A < CudaArch::GFX600;
 }

diff --git a/clang/include/clang/Basic/DiagnosticGroups.td b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -1412,6 +1412,9 @@ def MultiGPU: DiagGroup<"multi-gpu">;
 // libc and the CRT to be skipped.
 def AVRRtlibLinkingQuirks : DiagGroup<"avr-rtlib-linking-quirks">;
 
+// A warning group related to AArch64 SME function attribues.
+def AArch64SMEAttributes : DiagGroup<"aarch64-sme-attributes">;
+
 // A warning group for things that will change semantics in the future.
 def FutureCompat : DiagGroup<"future-compat">;
 

diff --git a/clang/include/clang/Basic/DiagnosticInstallAPIKinds.td b/clang/include/clang/Basic/DiagnosticInstallAPIKinds.td
@@ -20,6 +20,10 @@ def warn_no_such_excluded_header_file : Warning<"no such excluded %select{public
 def warn_glob_did_not_match: Warning<"glob '%0' did not match any header file">, InGroup<InstallAPIViolation>;
 def err_no_such_umbrella_header_file : Error<"%select{public|private|project}1 umbrella header file not found in input: '%0'">;
 def err_cannot_find_reexport : Error<"cannot find re-exported %select{framework|library}0: '%1'">;
+def err_no_matching_target : Error<"no matching target found for target variant '%0'">;
+def err_unsupported_vendor : Error<"vendor '%0' is not supported: '%1'">;
+def err_unsupported_environment : Error<"environment '%0' is not supported: '%1'">;
+def err_unsupported_os : Error<"os '%0' is not supported: '%1'">;
 } // end of command line category.
 
 let CategoryName = "Verification" in {

diff --git a/clang/include/clang/Basic/DiagnosticParseKinds.td b/clang/include/clang/Basic/DiagnosticParseKinds.td
@@ -941,6 +941,12 @@ def warn_cxx98_compat_defaulted_deleted_function : Warning<
   "%select{defaulted|deleted}0 function definitions are incompatible with C++98">,
   InGroup<CXX98Compat>, DefaultIgnore;
 
+def ext_delete_with_message : ExtWarn<
+  "'= delete' with a message is a C++2c extension">, InGroup<CXX26>;
+def warn_cxx23_delete_with_message : Warning<
+  "'= delete' with a message is incompatible with C++ standards before C++2c">,
+  DefaultIgnore, InGroup<CXXPre26Compat>;
+
 // C++11 default member initialization
 def ext_nonstatic_member_init : ExtWarn<
   "default member initializer for non-static data member is a C++11 "

diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -165,7 +165,7 @@ def ext_vla_folded_to_constant : ExtWarn<
   "variable length array folded to constant array as an extension">,
   InGroup<GNUFoldingConstant>;
 def err_vla_unsupported : Error<
-  "variable length arrays are not supported for %select{the current target|'%1'}0">;
+  "variable length arrays are not supported %select{for the current target|in '%1'}0">;
 def err_vla_in_coroutine_unsupported : Error<
   "variable length arrays in a coroutine are not supported">;
 def note_vla_unsupported : Note<
@@ -2402,10 +2402,6 @@ def err_selected_explicit_constructor : Error<
 def note_explicit_ctor_deduction_guide_here : Note<
   "explicit %select{constructor|deduction guide}0 declared here">;
 
-// C++11 decltype
-def err_decltype_in_declarator : Error<
-    "'decltype' cannot be used to name a declaration">;
-
 // C++11 auto
 def warn_cxx98_compat_auto_type_specifier : Warning<
   "'auto' type specifier is incompatible with C++98">,
@@ -3755,6 +3751,16 @@ def err_sme_definition_using_za_in_non_sme_target : Error<
   "function using ZA state requires 'sme'">;
 def err_sme_definition_using_zt0_in_non_sme2_target : Error<
   "function using ZT0 state requires 'sme2'">;
+def warn_sme_streaming_pass_return_vl_to_non_streaming : Warning<
+  "passing a VL-dependent argument to/from a function that has a different"
+  " streaming-mode. The streaming and non-streaming vector lengths may be"
+  " different">,
+  InGroup<AArch64SMEAttributes>, DefaultIgnore;
+def warn_sme_locally_streaming_has_vl_args_returns : Warning<
+  "passing/returning a VL-dependent argument to/from a __arm_locally_streaming"
+  " function. The streaming and non-streaming vector"
+  " lengths may be different">,
+  InGroup<AArch64SMEAttributes>, DefaultIgnore;
 def err_conflicting_attributes_arm_state : Error<
   "conflicting attributes for state '%0'">;
 def err_sme_streaming_cannot_be_multiversioned : Error<
@@ -4677,11 +4683,10 @@ def err_ovl_no_viable_member_function_in_call : Error<
   "no matching member function for call to %0">;
 def err_ovl_ambiguous_call : Error<
   "call to %0 is ambiguous">;
-def err_ovl_deleted_call : Error<"call to deleted function %0">;
+def err_ovl_deleted_call : Error<"call to deleted"
+  "%select{| member}0 function %1%select{|: %3}2">;
 def err_ovl_ambiguous_member_call : Error<
   "call to member function %0 is ambiguous">;
-def err_ovl_deleted_member_call : Error<
-  "call to deleted member function %0">;
 def note_ovl_too_many_candidates : Note<
     "remaining %0 candidate%s0 omitted; "
     "pass -fshow-overloads=all to show them">;
@@ -4909,12 +4914,12 @@ def err_ovl_ambiguous_conversion_in_cast : Error<
   "dynamic_cast|C-style cast|functional-style cast|}0 from %1 to %2">;
 def err_ovl_deleted_conversion_in_cast : Error<
   "%select{|static_cast|reinterpret_cast|dynamic_cast|C-style cast|"
-  "functional-style cast|}0 from %1 to %2 uses deleted function">;
+  "functional-style cast|}0 from %1 to %2 uses deleted function%select{|: %4}3">;
 def err_ovl_ambiguous_init : Error<"call to constructor of %0 is ambiguous">;
 def err_ref_init_ambiguous : Error<
   "reference initialization of type %0 with initializer of type %1 is ambiguous">;
 def err_ovl_deleted_init : Error<
-  "call to deleted constructor of %0">;
+  "call to deleted constructor of %0%select{|: %2}1">;
 def err_ovl_deleted_special_init : Error<
   "call to implicitly-deleted %select{default constructor|copy constructor|"
   "move constructor|copy assignment operator|move assignment operator|"
@@ -4940,7 +4945,7 @@ def note_ovl_ambiguous_oper_binary_reversed_candidate : Note<
 def err_ovl_no_viable_oper : Error<"no viable overloaded '%0'">;
 def note_assign_lhs_incomplete : Note<"type %0 is incomplete">;
 def err_ovl_deleted_oper : Error<
-  "overload resolution selected deleted operator '%0'">;
+  "overload resolution selected deleted operator '%0'%select{|: %2}1">;
 def err_ovl_deleted_special_oper : Error<
   "object of type %0 cannot be %select{constructed|copied|moved|assigned|"
   "assigned|destroyed}1 because its %sub{select_special_member_kind}1 is "
@@ -4977,7 +4982,7 @@ def err_ovl_ambiguous_object_call : Error<
 def err_ovl_ambiguous_subscript_call : Error<
   "call to subscript operator of type %0 is ambiguous">;
 def err_ovl_deleted_object_call : Error<
-  "call to deleted function call operator in type %0">;
+  "call to deleted function call operator in type %0%select{|: %2}1">;
 def note_ovl_surrogate_cand : Note<"conversion candidate of type %0">;
 def err_member_call_without_object : Error<
   "call to %select{non-static|explicit}0 member function without an object argument">;
@@ -7142,7 +7147,8 @@ def ext_typecheck_decl_incomplete_type : ExtWarn<
 def err_tentative_def_incomplete_type : Error<
   "tentative definition has type %0 that is never completed">;
 def warn_tentative_incomplete_array : Warning<
-  "tentative array definition assumed to have one element">;
+  "tentative array definition assumed to have one element">,
+  InGroup<DiagGroup<"tentative-definition-array">>;
 def err_typecheck_incomplete_array_needs_initializer : Error<
   "definition of variable with array type needs an explicit size "
   "or an initializer">;
@@ -7581,8 +7587,8 @@ def ext_gnu_ptr_func_arith : Extension<
   InGroup<GNUPointerArith>;
 def err_readonly_message_assignment : Error<
   "assigning to 'readonly' return result of an Objective-C message not allowed">;
-def ext_integer_increment_complex : Extension<
-  "ISO C does not support '++'/'--' on complex integer type %0">;
+def ext_increment_complex : Extension<
+  "'%select{--|++}0' on an object of complex type is a Clang extension">;
 def ext_integer_complement_complex : Extension<
   "ISO C does not support '~' for complex conjugation of %0">;
 def err_nosetter_property_assignment : Error<
@@ -8277,7 +8283,7 @@ def err_typecheck_nonviable_condition_incomplete : Error<
   "no viable conversion%diff{ from $ to incomplete type $|}0,1">;
 def err_typecheck_deleted_function : Error<
   "conversion function %diff{from $ to $|between types}0,1 "
-  "invokes a deleted function">;
+  "invokes a deleted function%select{|: %3}2">;
 
 def err_expected_class_or_namespace : Error<"%0 is not a class"
   "%select{ or namespace|, namespace, or enumeration}1">;
@@ -8302,6 +8308,9 @@ def ext_template_after_declarative_nns : ExtWarn<
 def ext_alias_template_in_declarative_nns : ExtWarn<
   "a declarative nested name specifier cannot name an alias template">,
   InGroup<DiagGroup<"alias-template-in-declaration-name">>;
+def err_computed_type_in_declarative_nns  : Error<
+  "a %select{pack indexing|'decltype'}0 specifier cannot be used in "
+  "a declarative nested name specifier">;
 
 def err_no_typeid_with_fno_rtti : Error<
   "use of typeid requires -frtti">;
@@ -8874,7 +8883,7 @@ def err_nontemporal_builtin_must_be_pointer_intfltptr_or_vector : Error<
   "address argument to nontemporal builtin must be a pointer to integer, float, "
   "pointer, or a vector of such types (%0 invalid)">;
 
-def err_deleted_function_use : Error<"attempt to use a deleted function">;
+def err_deleted_function_use : Error<"attempt to use a deleted function%select{|: %1}0">;
 def err_deleted_inherited_ctor_use : Error<
   "constructor inherited by %0 from base class %1 is implicitly deleted">;
 
@@ -12252,6 +12261,12 @@ def warn_acc_clause_unimplemented
 def err_acc_construct_appertainment
     : Error<"OpenACC construct '%0' cannot be used here; it can only "
             "be used in a statement context">;
+def err_acc_clause_appertainment
+    : Error<"OpenACC '%1' clause is not valid on '%0' directive">;
+def err_acc_duplicate_clause_disallowed
+    : Error<"OpenACC '%1' clause cannot appear more than once on a '%0' "
+            "directive">;
+def note_acc_previous_clause_here : Note<"previous clause is here">;
 def err_acc_branch_in_out_compute_construct
     : Error<"invalid %select{branch|return|throw}0 %select{out of|into}1 "
             "OpenACC Compute Construct">;

diff --git a/clang/include/clang/Basic/IdentifierTable.h b/clang/include/clang/Basic/IdentifierTable.h
@@ -913,12 +913,13 @@ class alignas(IdentifierInfoAlignment) MultiKeywordSelector
 
 public:
   // Constructor for keyword selectors.
-  MultiKeywordSelector(unsigned nKeys, IdentifierInfo **IIV)
+  MultiKeywordSelector(unsigned nKeys, const IdentifierInfo **IIV)
       : DeclarationNameExtra(nKeys) {
     assert((nKeys > 1) && "not a multi-keyword selector");
 
     // Fill in the trailing keyword array.
-    IdentifierInfo **KeyInfo = reinterpret_cast<IdentifierInfo **>(this + 1);
+    const IdentifierInfo **KeyInfo =
+        reinterpret_cast<const IdentifierInfo **>(this + 1);
     for (unsigned i = 0; i != nKeys; ++i)
       KeyInfo[i] = IIV[i];
   }
@@ -928,7 +929,7 @@ class alignas(IdentifierInfoAlignment) MultiKeywordSelector
 
   using DeclarationNameExtra::getNumArgs;
 
-  using keyword_iterator = IdentifierInfo *const *;
+  using keyword_iterator = const IdentifierInfo *const *;
 
   keyword_iterator keyword_begin() const {
     return reinterpret_cast<keyword_iterator>(this + 1);
@@ -938,7 +939,7 @@ class alignas(IdentifierInfoAlignment) MultiKeywordSelector
     return keyword_begin() + getNumArgs();
   }
 
-  IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const {
+  const IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const {
     assert(i < getNumArgs() && "getIdentifierInfoForSlot(): illegal index");
     return keyword_begin()[i];
   }
@@ -991,10 +992,10 @@ class Selector {
   /// Do not reorder or add any arguments to this template
   /// without thoroughly understanding how tightly coupled these classes are.
   llvm::PointerIntPair<
-      llvm::PointerUnion<IdentifierInfo *, MultiKeywordSelector *>, 2>
+      llvm::PointerUnion<const IdentifierInfo *, MultiKeywordSelector *>, 2>
       InfoPtr;
 
-  Selector(IdentifierInfo *II, unsigned nArgs) {
+  Selector(const IdentifierInfo *II, unsigned nArgs) {
     assert(nArgs < 2 && "nArgs not equal to 0/1");
     InfoPtr.setPointerAndInt(II, nArgs + 1);
   }
@@ -1006,8 +1007,8 @@ class Selector {
     InfoPtr.setPointerAndInt(SI, MultiArg & 0b11);
   }
 
-  IdentifierInfo *getAsIdentifierInfo() const {
-    return InfoPtr.getPointer().dyn_cast<IdentifierInfo *>();
+  const IdentifierInfo *getAsIdentifierInfo() const {
+    return InfoPtr.getPointer().dyn_cast<const IdentifierInfo *>();
   }
 
   MultiKeywordSelector *getMultiKeywordSelector() const {
@@ -1075,7 +1076,7 @@ class Selector {
   ///
   /// \returns the uniqued identifier for this slot, or NULL if this slot has
   /// no corresponding identifier.
-  IdentifierInfo *getIdentifierInfoForSlot(unsigned argIndex) const;
+  const IdentifierInfo *getIdentifierInfoForSlot(unsigned argIndex) const;
 
   /// Retrieve the name at a given position in the selector.
   ///
@@ -1132,13 +1133,13 @@ class SelectorTable {
   ///
   /// \p NumArgs indicates whether this is a no argument selector "foo", a
   /// single argument selector "foo:" or multi-argument "foo:bar:".
-  Selector getSelector(unsigned NumArgs, IdentifierInfo **IIV);
+  Selector getSelector(unsigned NumArgs, const IdentifierInfo **IIV);
 
-  Selector getUnarySelector(IdentifierInfo *ID) {
+  Selector getUnarySelector(const IdentifierInfo *ID) {
     return Selector(ID, 1);
   }
 
-  Selector getNullarySelector(IdentifierInfo *ID) {
+  Selector getNullarySelector(const IdentifierInfo *ID) {
     return Selector(ID, 0);
   }
 

diff --git a/clang/include/clang/Basic/OpenACCClauses.def b/clang/include/clang/Basic/OpenACCClauses.def
@@ -0,0 +1,21 @@
+//===-- OpenACCClauses.def - List of implemented OpenACC Clauses -- 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 a list of currently implemented OpenACC Clauses (and
+// eventually, the entire list) in a way that makes generating 'visitor' and
+// other lists easier.
+//
+// The primary macro is a single-argument version taking the name of the Clause
+// as used in Clang source (so `Default` instead of `default`).
+//
+// VISIT_CLAUSE(CLAUSE_NAME)
+
+VISIT_CLAUSE(Default)
+VISIT_CLAUSE(If)
+
+#undef VISIT_CLAUSE
diff --git a/clang/include/clang/Basic/OpenACCKinds.h b/clang/include/clang/Basic/OpenACCKinds.h
@@ -67,7 +67,7 @@ enum class OpenACCDirectiveKind {
 };
 
 template <typename StreamTy>
-inline StreamTy &PrintOpenACCDirectiveKind(StreamTy &Out,
+inline StreamTy &printOpenACCDirectiveKind(StreamTy &Out,
                                            OpenACCDirectiveKind K) {
   switch (K) {
   case OpenACCDirectiveKind::Parallel:
@@ -138,12 +138,12 @@ inline StreamTy &PrintOpenACCDirectiveKind(StreamTy &Out,
 
 inline const StreamingDiagnostic &operator<<(const StreamingDiagnostic &Out,
                                              OpenACCDirectiveKind K) {
-  return PrintOpenACCDirectiveKind(Out, K);
+  return printOpenACCDirectiveKind(Out, K);
 }
 
 inline llvm::raw_ostream &operator<<(llvm::raw_ostream &Out,
                                      OpenACCDirectiveKind K) {
-  return PrintOpenACCDirectiveKind(Out, K);
+  return printOpenACCDirectiveKind(Out, K);
 }
 
 enum class OpenACCAtomicKind {
@@ -266,7 +266,7 @@ enum class OpenACCClauseKind {
 };
 
 template <typename StreamTy>
-inline StreamTy &PrintOpenACCClauseKind(StreamTy &Out, OpenACCClauseKind K) {
+inline StreamTy &printOpenACCClauseKind(StreamTy &Out, OpenACCClauseKind K) {
   switch (K) {
   case OpenACCClauseKind::Finalize:
     return Out << "finalize";
@@ -402,12 +402,12 @@ inline StreamTy &PrintOpenACCClauseKind(StreamTy &Out, OpenACCClauseKind K) {
 
 inline const StreamingDiagnostic &operator<<(const StreamingDiagnostic &Out,
                                              OpenACCClauseKind K) {
-  return PrintOpenACCClauseKind(Out, K);
+  return printOpenACCClauseKind(Out, K);
 }
 
 inline llvm::raw_ostream &operator<<(llvm::raw_ostream &Out,
                                      OpenACCClauseKind K) {
-  return PrintOpenACCClauseKind(Out, K);
+  return printOpenACCClauseKind(Out, K);
 }
 
 enum class OpenACCDefaultClauseKind {
@@ -419,6 +419,30 @@ enum class OpenACCDefaultClauseKind {
   Invalid,
 };
 
+template <typename StreamTy>
+inline StreamTy &printOpenACCDefaultClauseKind(StreamTy &Out,
+                                               OpenACCDefaultClauseKind K) {
+  switch (K) {
+  case OpenACCDefaultClauseKind::None:
+    return Out << "none";
+  case OpenACCDefaultClauseKind::Present:
+    return Out << "present";
+  case OpenACCDefaultClauseKind::Invalid:
+    return Out << "<invalid>";
+  }
+  llvm_unreachable("Unknown OpenACCDefaultClauseKind enum");
+}
+
+inline const StreamingDiagnostic &operator<<(const StreamingDiagnostic &Out,
+                                             OpenACCDefaultClauseKind K) {
+  return printOpenACCDefaultClauseKind(Out, K);
+}
+
+inline llvm::raw_ostream &operator<<(llvm::raw_ostream &Out,
+                                     OpenACCDefaultClauseKind K) {
+  return printOpenACCDefaultClauseKind(Out, K);
+}
+
 enum class OpenACCReductionOperator {
   /// '+'.
   Addition,

diff --git a/clang/include/clang/Basic/Sanitizers.def b/clang/include/clang/Basic/Sanitizers.def
@@ -163,24 +163,24 @@ SANITIZER_GROUP("implicit-integer-arithmetic-value-change",
                 ImplicitIntegerArithmeticValueChange,
                 ImplicitIntegerSignChange | ImplicitSignedIntegerTruncation)
 
-SANITIZER("objc-cast", ObjCCast)
+SANITIZER_GROUP("implicit-integer-conversion", ImplicitIntegerConversion,
+                ImplicitIntegerArithmeticValueChange |
+                    ImplicitUnsignedIntegerTruncation)
 
-// FIXME:
-//SANITIZER_GROUP("implicit-integer-conversion", ImplicitIntegerConversion,
-//                ImplicitIntegerArithmeticValueChange |
-//                    ImplicitUnsignedIntegerTruncation)
-//SANITIZER_GROUP("implicit-conversion", ImplicitConversion,
-//                ImplicitIntegerConversion)
+// Implicit bitfield sanitizers
+SANITIZER("implicit-bitfield-conversion", ImplicitBitfieldConversion)
 
 SANITIZER_GROUP("implicit-conversion", ImplicitConversion,
-                ImplicitIntegerArithmeticValueChange |
-                    ImplicitUnsignedIntegerTruncation)
+                ImplicitIntegerConversion |
+                    ImplicitBitfieldConversion)
 
 SANITIZER_GROUP("integer", Integer,
-                ImplicitConversion | IntegerDivideByZero | Shift |
+                ImplicitIntegerConversion | IntegerDivideByZero | Shift |
                     SignedIntegerOverflow | UnsignedIntegerOverflow |
                     UnsignedShiftBase)
 
+SANITIZER("objc-cast", ObjCCast)
+
 SANITIZER("local-bounds", LocalBounds)
 SANITIZER_GROUP("bounds", Bounds, ArrayBounds | LocalBounds)
 

diff --git a/clang/include/clang/Basic/TokenKinds.def b/clang/include/clang/Basic/TokenKinds.def
@@ -521,6 +521,7 @@ TYPE_TRAIT_1(__is_union, IsUnion, KEYCXX)
 TYPE_TRAIT_1(__has_unique_object_representations,
              HasUniqueObjectRepresentations, KEYCXX)
 TYPE_TRAIT_2(__is_layout_compatible, IsLayoutCompatible, KEYCXX)
+TYPE_TRAIT_2(__is_pointer_interconvertible_base_of, IsPointerInterconvertibleBaseOf, KEYCXX)
 
 #define TRANSFORM_TYPE_TRAIT_DEF(_, Trait) KEYWORD(__##Trait, KEYCXX)
 #include "clang/Basic/TransformTypeTraits.def"

diff --git a/clang/include/clang/CIR/CMakeLists.txt b/clang/include/clang/CIR/CMakeLists.txt
diff --git a/clang/include/clang/CMakeLists.txt b/clang/include/clang/CMakeLists.txt
@@ -1,5 +1,8 @@
 add_subdirectory(AST)
 add_subdirectory(Basic)
+if(CLANG_ENABLE_CIR)
+  add_subdirectory(CIR)
+endif()
 add_subdirectory(Driver)
 add_subdirectory(Parse)
 add_subdirectory(Sema)

diff --git a/clang/include/clang/CodeGen/CodeGenAction.h b/clang/include/clang/CodeGen/CodeGenAction.h
@@ -57,6 +57,8 @@ class CodeGenAction : public ASTFrontendAction {
   bool loadLinkModules(CompilerInstance &CI);
 
 protected:
+  bool BeginSourceFileAction(CompilerInstance &CI) override;
+
   /// Create a new code generation action.  If the optional \p _VMContext
   /// parameter is supplied, the action uses it without taking ownership,
   /// otherwise it creates a fresh LLVM context and takes ownership.

diff --git a/clang/include/clang/Config/config.h.cmake b/clang/include/clang/Config/config.h.cmake
@@ -83,4 +83,7 @@
 /* Spawn a new process clang.exe for the CC1 tool invocation, when necessary */
 #cmakedefine01 CLANG_SPAWN_CC1
 
+/* Whether CIR is built into Clang */
+#cmakedefine01 CLANG_ENABLE_CIR
+
 #endif
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
@@ -1003,7 +1003,8 @@ def : Joined<["-"], "Xclang=">, Group<CompileOnly_Group>,
 def Xcuda_fatbinary : Separate<["-"], "Xcuda-fatbinary">,
   HelpText<"Pass <arg> to fatbinary invocation">, MetaVarName<"<arg>">;
 def Xcuda_ptxas : Separate<["-"], "Xcuda-ptxas">,
-  HelpText<"Pass <arg> to the ptxas assembler">, MetaVarName<"<arg>">;
+  HelpText<"Pass <arg> to the ptxas assembler">, MetaVarName<"<arg>">,
+  Visibility<[ClangOption, CLOption]>;
 def Xopenmp_target : Separate<["-"], "Xopenmp-target">, Group<CompileOnly_Group>,
   HelpText<"Pass <arg> to the target offloading toolchain.">, MetaVarName<"<arg>">;
 def Xopenmp_target_EQ : JoinedAndSeparate<["-"], "Xopenmp-target=">, Group<CompileOnly_Group>,
@@ -1340,7 +1341,8 @@ def hip_link : Flag<["--"], "hip-link">, Group<opencl_Group>,
   HelpText<"Link clang-offload-bundler bundles for HIP">;
 def no_hip_rt: Flag<["-"], "no-hip-rt">, Group<hip_Group>,
   HelpText<"Do not link against HIP runtime libraries">;
-def rocm_path_EQ : Joined<["--"], "rocm-path=">, Group<hip_Group>,
+def rocm_path_EQ : Joined<["--"], "rocm-path=">,
+  Visibility<[FlangOption]>, Group<hip_Group>,
   HelpText<"ROCm installation path, used for finding and automatically linking required bitcode libraries.">;
 def hip_path_EQ : Joined<["--"], "hip-path=">, Group<hip_Group>,
   HelpText<"HIP runtime installation path, used for finding HIP version and adding HIP include path.">;
@@ -1448,7 +1450,7 @@ def dD : Flag<["-"], "dD">, Group<d_Group>, Visibility<[ClangOption, CC1Option]>
 def dI : Flag<["-"], "dI">, Group<d_Group>, Visibility<[ClangOption, CC1Option]>,
   HelpText<"Print include directives in -E mode in addition to normal output">,
   MarshallingInfoFlag<PreprocessorOutputOpts<"ShowIncludeDirectives">>;
-def dM : Flag<["-"], "dM">, Group<d_Group>, Visibility<[ClangOption, CC1Option]>,
+def dM : Flag<["-"], "dM">, Group<d_Group>, Visibility<[ClangOption, CC1Option, FlangOption, FC1Option]>,
   HelpText<"Print macro definitions in -E mode instead of normal output">;
 def dead__strip : Flag<["-"], "dead_strip">;
 def dependency_file : Separate<["-"], "dependency-file">,
@@ -3034,6 +3036,7 @@ defm prebuilt_implicit_modules : BoolFOption<"prebuilt-implicit-modules",
 
 def fmodule_output_EQ : Joined<["-"], "fmodule-output=">,
   Flags<[NoXarchOption]>, Visibility<[ClangOption, CC1Option]>,
+  MarshallingInfoString<FrontendOpts<"ModuleOutputPath">>,
   HelpText<"Save intermediate module file results when compiling a standard C++ module unit.">;
 def fmodule_output : Flag<["-"], "fmodule-output">, Flags<[NoXarchOption]>,
   Visibility<[ClangOption, CC1Option]>,
@@ -3047,6 +3050,11 @@ defm skip_odr_check_in_gmf : BoolOption<"f", "skip-odr-check-in-gmf",
           "Perform ODR checks for decls in the global module fragment.">>,
   Group<f_Group>;
 
+def modules_reduced_bmi : Flag<["-"], "fexperimental-modules-reduced-bmi">,
+  Group<f_Group>, Visibility<[ClangOption, CC1Option]>,
+  HelpText<"Generate the reduced BMI">,
+  MarshallingInfoFlag<FrontendOpts<"GenReducedBMI">>;
+
 def fmodules_prune_interval : Joined<["-"], "fmodules-prune-interval=">, Group<i_Group>,
   Visibility<[ClangOption, CC1Option]>, MetaVarName<"<seconds>">,
   HelpText<"Specify the interval (in seconds) between attempts to prune the module cache">,
@@ -4911,6 +4919,9 @@ defm tgsplit : SimpleMFlag<"tgsplit", "Enable", "Disable",
 defm wavefrontsize64 : SimpleMFlag<"wavefrontsize64",
   "Specify wavefront size 64", "Specify wavefront size 32",
   " mode (AMDGPU only)">;
+defm amdgpu_precise_memory_op
+    : SimpleMFlag<"amdgpu-precise-memory-op", "Enable", "Disable",
+                  " precise memory mode (AMDGPU only)">;
 
 defm unsafe_fp_atomics : BoolMOption<"unsafe-fp-atomics",
   TargetOpts<"AllowAMDGPUUnsafeFPAtomics">, DefaultFalse,
@@ -5386,10 +5397,6 @@ def pg : Flag<["-"], "pg">, HelpText<"Enable mcount instrumentation">,
   MarshallingInfoFlag<CodeGenOpts<"InstrumentForProfiling">>;
 def pipe : Flag<["-", "--"], "pipe">,
   HelpText<"Use pipes between commands, when possible">;
-// Facebook T92898286
-def post_link_optimize : Flag<["--"], "post-link-optimize">,
-  HelpText<"Apply post-link optimizations using BOLT">;
-// End Facebook T92898286
 def prebind__all__twolevel__modules : Flag<["-"], "prebind_all_twolevel_modules">;
 def prebind : Flag<["-"], "prebind">;
 def preload : Flag<["-"], "preload">;
@@ -5464,21 +5471,23 @@ def rdynamic : Flag<["-"], "rdynamic">, Group<Link_Group>,
   Visibility<[ClangOption, FlangOption]>;
 def resource_dir : Separate<["-"], "resource-dir">,
   Flags<[NoXarchOption, HelpHidden]>,
-  Visibility<[ClangOption, CC1Option, CLOption, DXCOption]>,
+  Visibility<[ClangOption, CC1Option, CLOption, DXCOption, FlangOption, FC1Option]>,
   HelpText<"The directory which holds the compiler resource files">,
   MarshallingInfoString<HeaderSearchOpts<"ResourceDir">>;
 def resource_dir_EQ : Joined<["-"], "resource-dir=">, Flags<[NoXarchOption]>,
-  Visibility<[ClangOption, CLOption, DXCOption]>,
+  Visibility<[ClangOption, CLOption, DXCOption, FlangOption]>,
   Alias<resource_dir>;
 def rpath : Separate<["-"], "rpath">, Flags<[LinkerInput]>, Group<Link_Group>,
   Visibility<[ClangOption, CLOption, DXCOption, FlangOption]>;
 def rtlib_EQ : Joined<["-", "--"], "rtlib=">, Visibility<[ClangOption, CLOption]>,
   HelpText<"Compiler runtime library to use">;
 def frtlib_add_rpath: Flag<["-"], "frtlib-add-rpath">, Flags<[NoArgumentUnused]>,
+  Visibility<[ClangOption, FlangOption]>,
   HelpText<"Add -rpath with architecture-specific resource directory to the linker flags. "
   "When --hip-link is specified, also add -rpath with HIP runtime library directory to the linker flags">;
 def fno_rtlib_add_rpath: Flag<["-"], "fno-rtlib-add-rpath">,
   Flags<[NoArgumentUnused]>,
+  Visibility<[ClangOption, FlangOption]>,
   HelpText<"Do not add -rpath with architecture-specific resource directory to the linker flags. "
   "When --hip-link is specified, do not add -rpath with HIP runtime library directory to the linker flags">;
 def offload_add_rpath: Flag<["--"], "offload-add-rpath">,

diff --git a/clang/include/clang/Frontend/FrontendActions.h b/clang/include/clang/Frontend/FrontendActions.h
@@ -34,18 +34,12 @@ class InitOnlyAction : public FrontendAction {
 
 /// Preprocessor-based frontend action that also loads PCH files.
 class ReadPCHAndPreprocessAction : public FrontendAction {
-  llvm::unique_function<void(CompilerInstance &)> AdjustCI;
-
   void ExecuteAction() override;
 
   std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
                                                  StringRef InFile) override;
 
 public:
-  ReadPCHAndPreprocessAction(
-      llvm::unique_function<void(CompilerInstance &)> AdjustCI)
-      : AdjustCI(std::move(AdjustCI)) {}
-
   bool usesPreprocessorOnly() const override { return false; }
 };
 
@@ -327,15 +321,11 @@ class PrintPreprocessedAction : public PreprocessorFrontendAction {
 
 class GetDependenciesByModuleNameAction : public PreprocessOnlyAction {
   StringRef ModuleName;
-  llvm::unique_function<void(CompilerInstance &)> AdjustCI;
-
   void ExecuteAction() override;
 
 public:
-  GetDependenciesByModuleNameAction(
-      StringRef ModuleName,
-      llvm::unique_function<void(CompilerInstance &)> AdjustCI)
-      : ModuleName(ModuleName), AdjustCI(std::move(AdjustCI)) {}
+  GetDependenciesByModuleNameAction(StringRef ModuleName)
+      : ModuleName(ModuleName) {}
 };
 
 }  // end namespace clang

diff --git a/clang/include/clang/Frontend/FrontendOptions.h b/clang/include/clang/Frontend/FrontendOptions.h
@@ -404,6 +404,10 @@ class FrontendOptions {
   LLVM_PREFERRED_TYPE(bool)
   unsigned EmitPrettySymbolGraphs : 1;
 
+  /// Whether to generate reduced BMI for C++20 named modules.
+  LLVM_PREFERRED_TYPE(bool)
+  unsigned GenReducedBMI : 1;
+
   CodeCompleteOptions CodeCompleteOpts;
 
   /// Specifies the output format of the AST.
@@ -568,6 +572,9 @@ class FrontendOptions {
   /// Path which stores the output files for -ftime-trace
   std::string TimeTracePath;
 
+  /// Output Path for module output file.
+  std::string ModuleOutputPath;
+
 public:
   FrontendOptions()
       : DisableFree(false), RelocatablePCH(false), ShowHelp(false),
@@ -582,7 +589,8 @@ class FrontendOptions {
         AllowPCMWithCompilerErrors(false), ModulesShareFileManager(true),
         EmitSymbolGraph(false), EmitExtensionSymbolGraphs(false),
         EmitSymbolGraphSymbolLabelsForTesting(false),
-        EmitPrettySymbolGraphs(false), TimeTraceGranularity(500) {}
+        EmitPrettySymbolGraphs(false), GenReducedBMI(false),
+        TimeTraceGranularity(500) {}
 
   /// getInputKindForExtension - Return the appropriate input kind for a file
   /// extension. For example, "c" would return Language::C.

diff --git a/clang/include/clang/InstallAPI/DylibVerifier.h b/clang/include/clang/InstallAPI/DylibVerifier.h
@@ -10,6 +10,7 @@
 #define LLVM_CLANG_INSTALLAPI_DYLIBVERIFIER_H
 
 #include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/SourceManager.h"
 #include "clang/InstallAPI/MachO.h"
 
 namespace clang {
@@ -27,6 +28,16 @@ enum class VerificationMode {
 using LibAttrs = llvm::StringMap<ArchitectureSet>;
 using ReexportedInterfaces = llvm::SmallVector<llvm::MachO::InterfaceFile, 8>;
 
+// Pointers to information about a zippered declaration used for
+// querying and reporting violations against different
+// declarations that all map to the same symbol.
+struct ZipperedDeclSource {
+  const FrontendAttrs *FA;
+  clang::SourceManager *SrcMgr;
+  Target T;
+};
+using ZipperedDeclSources = std::vector<ZipperedDeclSource>;
+
 /// Service responsible to tracking state of verification across the
 /// lifetime of InstallAPI.
 /// As declarations are collected during AST traversal, they are
@@ -67,10 +78,10 @@ class DylibVerifier : llvm::MachO::RecordVisitor {
   DylibVerifier() = default;
 
   DylibVerifier(llvm::MachO::Records &&Dylib, ReexportedInterfaces &&Reexports,
-                DiagnosticsEngine *Diag, VerificationMode Mode, bool Demangle,
-                StringRef DSYMPath)
+                DiagnosticsEngine *Diag, VerificationMode Mode, bool Zippered,
+                bool Demangle, StringRef DSYMPath)
       : Dylib(std::move(Dylib)), Reexports(std::move(Reexports)), Mode(Mode),
-        Demangle(Demangle), DSYMPath(DSYMPath),
+        Zippered(Zippered), Demangle(Demangle), DSYMPath(DSYMPath),
         Exports(std::make_unique<SymbolSet>()), Ctx(VerifierContext{Diag}) {}
 
   Result verify(GlobalRecord *R, const FrontendAttrs *FA);
@@ -99,11 +110,7 @@ class DylibVerifier : llvm::MachO::RecordVisitor {
   Result getState() const { return Ctx.FrontendState; }
 
   /// Set different source managers to the same diagnostics engine.
-  void setSourceManager(SourceManager &SourceMgr) const {
-    if (!Ctx.Diag)
-      return;
-    Ctx.Diag->setSourceManager(&SourceMgr);
-  }
+  void setSourceManager(IntrusiveRefCntPtr<SourceManager> SourceMgr);
 
 private:
   /// Determine whether to compare declaration to symbol in binary.
@@ -121,6 +128,15 @@ class DylibVerifier : llvm::MachO::RecordVisitor {
   /// symbols should be omitted from the text-api file.
   bool shouldIgnoreReexport(const Record *R, SymbolContext &SymCtx) const;
 
+  // Ignore and omit unavailable symbols in zippered libraries.
+  bool shouldIgnoreZipperedAvailability(const Record *R, SymbolContext &SymCtx);
+
+  // Check if an internal declaration in zippered library has an
+  // external declaration for a different platform. This results
+  // in the symbol being in a "seperate" platform slice.
+  bool shouldIgnoreInternalZipperedSymbol(const Record *R,
+                                          const SymbolContext &SymCtx) const;
+
   /// Compare the visibility declarations to the linkage of symbol found in
   /// dylib.
   Result compareVisibility(const Record *R, SymbolContext &SymCtx,
@@ -176,6 +192,9 @@ class DylibVerifier : llvm::MachO::RecordVisitor {
   // Controls what class of violations to report.
   VerificationMode Mode = VerificationMode::Invalid;
 
+  // Library is zippered.
+  bool Zippered = false;
+
   // Attempt to demangle when reporting violations.
   bool Demangle = false;
 
@@ -185,11 +204,18 @@ class DylibVerifier : llvm::MachO::RecordVisitor {
   // Valid symbols in final text file.
   std::unique_ptr<SymbolSet> Exports = std::make_unique<SymbolSet>();
 
+  // Unavailable or obsoleted declarations for a zippered library.
+  // These are cross referenced against symbols in the dylib.
+  llvm::StringMap<ZipperedDeclSources> DeferredZipperedSymbols;
+
   // Track current state of verification while traversing AST.
   VerifierContext Ctx;
 
   // Track DWARF provided source location for dylibs.
   DWARFContext *DWARFCtx = nullptr;
+
+  // Source manager for each unique compiler instance.
+  llvm::SmallVector<IntrusiveRefCntPtr<SourceManager>, 12> SourceManagers;
 };
 
 } // namespace installapi

diff --git a/clang/include/clang/InstallAPI/Frontend.h b/clang/include/clang/InstallAPI/Frontend.h
@@ -36,7 +36,7 @@ class InstallAPIAction : public ASTFrontendAction {
   std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
                                                  StringRef InFile) override {
     Ctx.Diags->getClient()->BeginSourceFile(CI.getLangOpts());
-    Ctx.Verifier->setSourceManager(CI.getSourceManager());
+    Ctx.Verifier->setSourceManager(CI.getSourceManagerPtr());
     return std::make_unique<InstallAPIVisitor>(
         CI.getASTContext(), Ctx, CI.getSourceManager(), CI.getPreprocessor());
   }

diff --git a/clang/include/clang/InstallAPI/FrontendRecords.h b/clang/include/clang/InstallAPI/FrontendRecords.h
@@ -21,6 +21,7 @@ namespace installapi {
 struct FrontendAttrs {
   const AvailabilityInfo Avail;
   const Decl *D;
+  const SourceLocation Loc;
   const HeaderType Access;
 };
 

diff --git a/clang/include/clang/Lex/ExternalPreprocessorSource.h b/clang/include/clang/Lex/ExternalPreprocessorSource.h
@@ -31,7 +31,7 @@ class ExternalPreprocessorSource {
   virtual void ReadDefinedMacros() = 0;
 
   /// Update an out-of-date identifier.
-  virtual void updateOutOfDateIdentifier(IdentifierInfo &II) = 0;
+  virtual void updateOutOfDateIdentifier(const IdentifierInfo &II) = 0;
 
   /// Return the identifier associated with the given ID number.
   ///