diff --git a/clang/include/clang/Parse/Parser.h b/clang/include/clang/Parse/Parser.h
@@ -41,6 +41,7 @@ namespace clang {
   class InMessageExpressionRAIIObject;
   class PoisonSEHIdentifiersRAIIObject;
   class OMPClause;
+  class OpenACCClause;
   class ObjCTypeParamList;
   struct OMPTraitProperty;
   struct OMPTraitSelector;
@@ -3594,11 +3595,26 @@ class Parser : public CodeCompletionHandler {
     OpenACCDirectiveKind DirKind;
     SourceLocation StartLoc;
     SourceLocation EndLoc;
-    // TODO OpenACC: Add Clause list here once we have a type for that.
+    SmallVector<OpenACCClause *> Clauses;
     // TODO OpenACC: As we implement support for the Atomic, Routine, Cache, and
     // Wait constructs, we likely want to put that information in here as well.
   };
 
+  /// Represents the 'error' state of parsing an OpenACC Clause, and stores
+  /// whether we can continue parsing, or should give up on the directive.
+  enum class OpenACCParseCanContinue { Cannot = 0, Can = 1 };
+
+  /// A type to represent the state of parsing an OpenACC Clause. Situations
+  /// that result in an OpenACCClause pointer are a success and can continue
+  /// parsing, however some other situations can also continue.
+  /// FIXME: This is better represented as a std::expected when we get C++23.
+  using OpenACCClauseParseResult =
+      llvm::PointerIntPair<OpenACCClause *, 1, OpenACCParseCanContinue>;
+
+  OpenACCClauseParseResult OpenACCCanContinue();
+  OpenACCClauseParseResult OpenACCCannotContinue();
+  OpenACCClauseParseResult OpenACCSuccess(OpenACCClause *Clause);
+
   /// Parses the OpenACC directive (the entire pragma) including the clause
   /// list, but does not produce the main AST node.
   OpenACCDirectiveParseInfo ParseOpenACCDirective();
@@ -3613,12 +3629,18 @@ class Parser : public CodeCompletionHandler {
   bool ParseOpenACCClauseVarList(OpenACCClauseKind Kind);
   /// Parses any parameters for an OpenACC Clause, including required/optional
   /// parens.
-  bool ParseOpenACCClauseParams(OpenACCDirectiveKind DirKind,
-                                OpenACCClauseKind Kind);
-  /// Parses a single clause in a clause-list for OpenACC.
-  bool ParseOpenACCClause(OpenACCDirectiveKind DirKind);
+  OpenACCClauseParseResult
+  ParseOpenACCClauseParams(ArrayRef<const OpenACCClause *> ExistingClauses,
+                           OpenACCDirectiveKind DirKind, OpenACCClauseKind Kind,
+                           SourceLocation ClauseLoc);
+  /// Parses a single clause in a clause-list for OpenACC. Returns nullptr on
+  /// error.
+  OpenACCClauseParseResult
+  ParseOpenACCClause(ArrayRef<const OpenACCClause *> ExistingClauses,
+                     OpenACCDirectiveKind DirKind);
   /// Parses the clause-list for an OpenACC directive.
-  void ParseOpenACCClauseList(OpenACCDirectiveKind DirKind);
+  SmallVector<OpenACCClause *>
+  ParseOpenACCClauseList(OpenACCDirectiveKind DirKind);
   bool ParseOpenACCWaitArgument();
   /// Parses the clause of the 'bind' argument, which can be a string literal or
   /// an ID expression.

diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
diff --git a/clang/include/clang/Sema/SemaBase.h b/clang/include/clang/Sema/SemaBase.h
@@ -0,0 +1,224 @@
+//===--- SemaBase.h - Common utilities for semantic analysis-----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the SemaBase class, which provides utilities for Sema
+// and its parts like SemaOpenACC.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_SEMA_SEMABASE_H
+#define LLVM_CLANG_SEMA_SEMABASE_H
+
+#include "clang/AST/Decl.h"
+#include "clang/AST/Redeclarable.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/PartialDiagnostic.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Sema/Ownership.h"
+#include "llvm/ADT/DenseMap.h"
+#include <optional>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+namespace clang {
+
+class ASTContext;
+class DiagnosticsEngine;
+class LangOptions;
+class Sema;
+
+class SemaBase {
+public:
+  SemaBase(Sema &S);
+
+  Sema &SemaRef;
+
+  ASTContext &getASTContext() const;
+  DiagnosticsEngine &getDiagnostics() const;
+  const LangOptions &getLangOpts() const;
+
+  /// Helper class that creates diagnostics with optional
+  /// template instantiation stacks.
+  ///
+  /// This class provides a wrapper around the basic DiagnosticBuilder
+  /// class that emits diagnostics. ImmediateDiagBuilder is
+  /// responsible for emitting the diagnostic (as DiagnosticBuilder
+  /// does) and, if the diagnostic comes from inside a template
+  /// instantiation, printing the template instantiation stack as
+  /// well.
+  class ImmediateDiagBuilder : public DiagnosticBuilder {
+    Sema &SemaRef;
+    unsigned DiagID;
+
+  public:
+    ImmediateDiagBuilder(DiagnosticBuilder &DB, Sema &SemaRef, unsigned DiagID)
+        : DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) {}
+    ImmediateDiagBuilder(DiagnosticBuilder &&DB, Sema &SemaRef, unsigned DiagID)
+        : DiagnosticBuilder(DB), SemaRef(SemaRef), DiagID(DiagID) {}
+
+    // This is a cunning lie. DiagnosticBuilder actually performs move
+    // construction in its copy constructor (but due to varied uses, it's not
+    // possible to conveniently express this as actual move construction). So
+    // the default copy ctor here is fine, because the base class disables the
+    // source anyway, so the user-defined ~ImmediateDiagBuilder is a safe no-op
+    // in that case anwyay.
+    ImmediateDiagBuilder(const ImmediateDiagBuilder &) = default;
+
+    ~ImmediateDiagBuilder();
+
+    /// Teach operator<< to produce an object of the correct type.
+    template <typename T>
+    friend const ImmediateDiagBuilder &
+    operator<<(const ImmediateDiagBuilder &Diag, const T &Value) {
+      const DiagnosticBuilder &BaseDiag = Diag;
+      BaseDiag << Value;
+      return Diag;
+    }
+
+    // It is necessary to limit this to rvalue reference to avoid calling this
+    // function with a bitfield lvalue argument since non-const reference to
+    // bitfield is not allowed.
+    template <typename T,
+              typename = std::enable_if_t<!std::is_lvalue_reference<T>::value>>
+    const ImmediateDiagBuilder &operator<<(T &&V) const {
+      const DiagnosticBuilder &BaseDiag = *this;
+      BaseDiag << std::move(V);
+      return *this;
+    }
+  };
+
+  /// A generic diagnostic builder for errors which may or may not be deferred.
+  ///
+  /// In CUDA, there exist constructs (e.g. variable-length arrays, try/catch)
+  /// which are not allowed to appear inside __device__ functions and are
+  /// allowed to appear in __host__ __device__ functions only if the host+device
+  /// function is never codegen'ed.
+  ///
+  /// To handle this, we use the notion of "deferred diagnostics", where we
+  /// attach a diagnostic to a FunctionDecl that's emitted iff it's codegen'ed.
+  ///
+  /// This class lets you emit either a regular diagnostic, a deferred
+  /// diagnostic, or no diagnostic at all, according to an argument you pass to
+  /// its constructor, thus simplifying the process of creating these "maybe
+  /// deferred" diagnostics.
+  class SemaDiagnosticBuilder {
+  public:
+    enum Kind {
+      /// Emit no diagnostics.
+      K_Nop,
+      /// Emit the diagnostic immediately (i.e., behave like Sema::Diag()).
+      K_Immediate,
+      /// Emit the diagnostic immediately, and, if it's a warning or error, also
+      /// emit a call stack showing how this function can be reached by an a
+      /// priori known-emitted function.
+      K_ImmediateWithCallStack,
+      /// Create a deferred diagnostic, which is emitted only if the function
+      /// it's attached to is codegen'ed.  Also emit a call stack as with
+      /// K_ImmediateWithCallStack.
+      K_Deferred
+    };
+
+    SemaDiagnosticBuilder(Kind K, SourceLocation Loc, unsigned DiagID,
+                          const FunctionDecl *Fn, Sema &S);
+    SemaDiagnosticBuilder(SemaDiagnosticBuilder &&D);
+    SemaDiagnosticBuilder(const SemaDiagnosticBuilder &) = default;
+
+    // The copy and move assignment operator is defined as deleted pending
+    // further motivation.
+    SemaDiagnosticBuilder &operator=(const SemaDiagnosticBuilder &) = delete;
+    SemaDiagnosticBuilder &operator=(SemaDiagnosticBuilder &&) = delete;
+
+    ~SemaDiagnosticBuilder();
+
+    bool isImmediate() const { return ImmediateDiag.has_value(); }
+
+    /// Convertible to bool: True if we immediately emitted an error, false if
+    /// we didn't emit an error or we created a deferred error.
+    ///
+    /// Example usage:
+    ///
+    ///   if (SemaDiagnosticBuilder(...) << foo << bar)
+    ///     return ExprError();
+    ///
+    /// But see CUDADiagIfDeviceCode() and CUDADiagIfHostCode() -- you probably
+    /// want to use these instead of creating a SemaDiagnosticBuilder yourself.
+    operator bool() const { return isImmediate(); }
+
+    template <typename T>
+    friend const SemaDiagnosticBuilder &
+    operator<<(const SemaDiagnosticBuilder &Diag, const T &Value) {
+      if (Diag.ImmediateDiag)
+        *Diag.ImmediateDiag << Value;
+      else if (Diag.PartialDiagId)
+        Diag.getDeviceDeferredDiags()[Diag.Fn][*Diag.PartialDiagId].second
+            << Value;
+      return Diag;
+    }
+
+    // It is necessary to limit this to rvalue reference to avoid calling this
+    // function with a bitfield lvalue argument since non-const reference to
+    // bitfield is not allowed.
+    template <typename T,
+              typename = std::enable_if_t<!std::is_lvalue_reference<T>::value>>
+    const SemaDiagnosticBuilder &operator<<(T &&V) const {
+      if (ImmediateDiag)
+        *ImmediateDiag << std::move(V);
+      else if (PartialDiagId)
+        getDeviceDeferredDiags()[Fn][*PartialDiagId].second << std::move(V);
+      return *this;
+    }
+
+    friend const SemaDiagnosticBuilder &
+    operator<<(const SemaDiagnosticBuilder &Diag, const PartialDiagnostic &PD);
+
+    void AddFixItHint(const FixItHint &Hint) const;
+
+    friend ExprResult ExprError(const SemaDiagnosticBuilder &) {
+      return ExprError();
+    }
+    friend StmtResult StmtError(const SemaDiagnosticBuilder &) {
+      return StmtError();
+    }
+    operator ExprResult() const { return ExprError(); }
+    operator StmtResult() const { return StmtError(); }
+    operator TypeResult() const { return TypeError(); }
+    operator DeclResult() const { return DeclResult(true); }
+    operator MemInitResult() const { return MemInitResult(true); }
+
+    using DeferredDiagnosticsType =
+        llvm::DenseMap<CanonicalDeclPtr<const FunctionDecl>,
+                       std::vector<PartialDiagnosticAt>>;
+
+  private:
+    Sema &S;
+    SourceLocation Loc;
+    unsigned DiagID;
+    const FunctionDecl *Fn;
+    bool ShowCallStack;
+
+    // Invariant: At most one of these Optionals has a value.
+    // FIXME: Switch these to a Variant once that exists.
+    std::optional<ImmediateDiagBuilder> ImmediateDiag;
+    std::optional<unsigned> PartialDiagId;
+
+    DeferredDiagnosticsType &getDeviceDeferredDiags() const;
+  };
+
+  /// Emit a diagnostic.
+  SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID,
+                             bool DeferHint = false);
+
+  /// Emit a partial diagnostic.
+  SemaDiagnosticBuilder Diag(SourceLocation Loc, const PartialDiagnostic &PD,
+                             bool DeferHint = false);
+};
+
+} // namespace clang
+
+#endif
diff --git a/clang/include/clang/Sema/SemaHLSL.h b/clang/include/clang/Sema/SemaHLSL.h
@@ -0,0 +1,37 @@
+//===----- SemaHLSL.h ----- Semantic Analysis for HLSL constructs ---------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This file declares semantic analysis for HLSL constructs.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_SEMA_SEMAHLSL_H
+#define LLVM_CLANG_SEMA_SEMAHLSL_H
+
+#include "clang/AST/DeclBase.h"
+#include "clang/AST/Expr.h"
+#include "clang/Basic/IdentifierTable.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Sema/Scope.h"
+#include "clang/Sema/SemaBase.h"
+
+namespace clang {
+
+class SemaHLSL : public SemaBase {
+public:
+  SemaHLSL(Sema &S);
+
+  Decl *ActOnStartHLSLBuffer(Scope *BufferScope, bool CBuffer,
+                             SourceLocation KwLoc, IdentifierInfo *Ident,
+                             SourceLocation IdentLoc, SourceLocation LBrace);
+  void ActOnFinishHLSLBuffer(Decl *Dcl, SourceLocation RBrace);
+};
+
+} // namespace clang
+
+#endif // LLVM_CLANG_SEMA_SEMAHLSL_H
diff --git a/clang/include/clang/Sema/SemaOpenACC.h b/clang/include/clang/Sema/SemaOpenACC.h
@@ -18,26 +18,49 @@
 #include "clang/Basic/OpenACCKinds.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Sema/Ownership.h"
+#include "clang/Sema/SemaBase.h"
 
 namespace clang {
+class OpenACCClause;
 
-class ASTContext;
-class DiagnosticEngine;
-class LangOptions;
-class Sema;
-
-class SemaOpenACC {
+class SemaOpenACC : public SemaBase {
 public:
-  SemaOpenACC(Sema &S);
+  /// A type to represent all the data for an OpenACC Clause that has been
+  /// parsed, but not yet created/semantically analyzed. This is effectively a
+  /// discriminated union on the 'Clause Kind', with all of the individual
+  /// clause details stored in a std::variant.
+  class OpenACCParsedClause {
+    OpenACCDirectiveKind DirKind;
+    OpenACCClauseKind ClauseKind;
+    SourceRange ClauseRange;
+    SourceLocation LParenLoc;
+
+    // TODO OpenACC: Add variant here to store details of individual clauses.
+
+  public:
+    OpenACCParsedClause(OpenACCDirectiveKind DirKind,
+                        OpenACCClauseKind ClauseKind, SourceLocation BeginLoc)
+        : DirKind(DirKind), ClauseKind(ClauseKind), ClauseRange(BeginLoc, {}) {}
+
+    OpenACCDirectiveKind getDirectiveKind() const { return DirKind; }
+
+    OpenACCClauseKind getClauseKind() const { return ClauseKind; }
 
-  ASTContext &getASTContext() const;
-  DiagnosticsEngine &getDiagnostics() const;
-  const LangOptions &getLangOpts() const;
+    SourceLocation getBeginLoc() const { return ClauseRange.getBegin(); }
 
-  Sema &SemaRef;
+    SourceLocation getLParenLoc() const { return LParenLoc; }
+
+    SourceLocation getEndLoc() const { return ClauseRange.getEnd(); }
+
+    void setLParenLoc(SourceLocation EndLoc) { LParenLoc = EndLoc; }
+    void setEndLoc(SourceLocation EndLoc) { ClauseRange.setEnd(EndLoc); }
+  };
+
+  SemaOpenACC(Sema &S);
 
   /// Called after parsing an OpenACC Clause so that it can be checked.
-  bool ActOnClause(OpenACCClauseKind ClauseKind, SourceLocation StartLoc);
+  OpenACCClause *ActOnClause(ArrayRef<const OpenACCClause *> ExistingClauses,
+                             OpenACCParsedClause &Clause);
 
   /// Called after the construct has been parsed, but clauses haven't been
   /// parsed.  This allows us to diagnose not-implemented, as well as set up any
@@ -63,7 +86,10 @@ class SemaOpenACC {
   /// declaration group or associated statement.
   StmtResult ActOnEndStmtDirective(OpenACCDirectiveKind K,
                                    SourceLocation StartLoc,
-                                   SourceLocation EndLoc, StmtResult AssocStmt);
+                                   SourceLocation EndLoc,
+                                   ArrayRef<OpenACCClause *> Clauses,
+                                   StmtResult AssocStmt);
+
   /// Called after the directive has been completely parsed, including the
   /// declaration group or associated statement.
   DeclGroupRef ActOnEndDeclDirective();

diff --git a/clang/include/clang/Serialization/ASTReader.h b/clang/include/clang/Serialization/ASTReader.h
@@ -1089,27 +1089,13 @@ class ASTReader
   /// the last time we loaded information about this identifier.
   llvm::DenseMap<IdentifierInfo *, unsigned> IdentifierGeneration;
 
-  class InterestingDecl {
-    Decl *D;
-    bool DeclHasPendingBody;
-
-  public:
-    InterestingDecl(Decl *D, bool HasBody)
-        : D(D), DeclHasPendingBody(HasBody) {}
-
-    Decl *getDecl() { return D; }
-
-    /// Whether the declaration has a pending body.
-    bool hasPendingBody() { return DeclHasPendingBody; }
-  };
-
   /// Contains declarations and definitions that could be
   /// "interesting" to the ASTConsumer, when we get that AST consumer.
   ///
   /// "Interesting" declarations are those that have data that may
   /// need to be emitted, such as inline function definitions or
   /// Objective-C protocols.
-  std::deque<InterestingDecl> PotentiallyInterestingDecls;
+  std::deque<Decl *> PotentiallyInterestingDecls;
 
   /// The list of deduced function types that we have not yet read, because
   /// they might contain a deduced return type that refers to a local type

diff --git a/clang/include/clang/Serialization/ASTRecordReader.h b/clang/include/clang/Serialization/ASTRecordReader.h
@@ -24,6 +24,7 @@
 #include "llvm/ADT/APSInt.h"
 
 namespace clang {
+class OpenACCClause;
 class OMPTraitInfo;
 class OMPChildren;
 
@@ -278,6 +279,12 @@ class ASTRecordReader
   /// Read an OpenMP children, advancing Idx.
   void readOMPChildren(OMPChildren *Data);
 
+  /// Read an OpenACC clause, advancing Idx.
+  OpenACCClause *readOpenACCClause();
+
+  /// Read a list of OpenACC clauses into the passed SmallVector.
+  void readOpenACCClauseList(MutableArrayRef<const OpenACCClause *> Clauses);
+
   /// Read a source location, advancing Idx.
   SourceLocation readSourceLocation(LocSeq *Seq = nullptr) {
     return Reader->ReadSourceLocation(*F, Record, Idx, Seq);

diff --git a/clang/include/clang/Serialization/ASTRecordWriter.h b/clang/include/clang/Serialization/ASTRecordWriter.h
@@ -21,6 +21,7 @@
 
 namespace clang {
 
+class OpenACCClause;
 class TypeLoc;
 
 /// An object for streaming information to a record.
@@ -292,6 +293,12 @@ class ASTRecordWriter
   /// Writes data related to the OpenMP directives.
   void writeOMPChildren(OMPChildren *Data);
 
+  /// Writes out a single OpenACC Clause.
+  void writeOpenACCClause(const OpenACCClause *C);
+
+  /// Writes out a list of OpenACC clauses.
+  void writeOpenACCClauseList(ArrayRef<const OpenACCClause *> Clauses);
+
   /// Emit a string.
   void AddString(StringRef Str) {
     return Writer->AddString(Str, *Record);

diff --git a/clang/include/clang/StaticAnalyzer/Checkers/Checkers.td b/clang/include/clang/StaticAnalyzer/Checkers/Checkers.td
@@ -604,6 +604,15 @@ def PthreadLockChecker : Checker<"PthreadLock">,
 def StreamChecker : Checker<"Stream">,
   HelpText<"Check stream handling functions">,
   WeakDependencies<[NonNullParamChecker]>,
+  CheckerOptions<[
+    CmdLineOption<Boolean,
+                  "Pedantic",
+                  "If false, assume that stream operations which are often not "
+                  "checked for error do not fail."
+                  "fail.",
+                  "false",
+                  InAlpha>
+  ]>,
   Documentation<HasDocumentation>;
 
 def SimpleStreamChecker : Checker<"SimpleStream">,

diff --git a/clang/include/clang/StaticAnalyzer/Core/BugReporter/BugReporterVisitors.h b/clang/include/clang/StaticAnalyzer/Core/BugReporter/BugReporterVisitors.h
@@ -374,6 +374,7 @@ bool trackExpressionValue(const ExplodedNode *N, const Expr *E,
 /// from.
 ///
 /// \param V We're searching for the store where \c R received this value.
+///        It may be either defined or undefined, but should not be unknown.
 /// \param R The region we're tracking.
 /// \param Opts Tracking options specifying how we want to track the value.
 /// \param Origin Only adds notes when the last store happened in a
@@ -383,7 +384,7 @@ bool trackExpressionValue(const ExplodedNode *N, const Expr *E,
 ///        changes to its value in a nested stackframe could be pruned, and
 ///        this visitor can prevent that without polluting the bugpath too
 ///        much.
-void trackStoredValue(KnownSVal V, const MemRegion *R,
+void trackStoredValue(SVal V, const MemRegion *R,
                       PathSensitiveBugReport &Report, TrackingOptions Opts = {},
                       const StackFrameContext *Origin = nullptr);
 

diff --git a/clang/include/clang/StaticAnalyzer/Core/PathSensitive/CallDescription.h b/clang/include/clang/StaticAnalyzer/Core/PathSensitive/CallDescription.h
@@ -32,19 +32,22 @@ namespace ento {
 class CallDescription {
 public:
   enum class Mode {
-    /// Match calls to functions from the C standard library. On some platforms
-    /// some functions may be implemented as macros that expand to calls to
-    /// built-in variants of the given functions, so in this mode we use some
-    /// heuristics to recognize these implementation-defined variants:
-    ///  - We also accept calls where the name is derived from the specified
-    ///    name by adding "__builtin" or similar prefixes/suffixes.
-    ///  - We also accept calls where the number of arguments or parameters is
-    ///    greater than the specified value.
+    /// Match calls to functions from the C standard library. This also
+    /// recognizes builtin variants whose name is derived by adding
+    /// "__builtin", "__inline" or similar prefixes or suffixes; but only
+    /// matches functions than are externally visible and are declared either
+    /// directly within a TU or in the namespace 'std'.
     /// For the exact heuristics, see CheckerContext::isCLibraryFunction().
-    /// (This mode only matches functions that are declared either directly
-    /// within a TU or in the namespace `std`.)
     CLibrary,
 
+    /// An extended version of the `CLibrary` mode that also matches the
+    /// hardened variants like __FOO_chk() and __builtin__FOO_chk() that take
+    /// additional arguments compared to the "regular" function FOO().
+    /// This is not the default behavior of `CLibrary` because in this case the
+    /// checker code must be prepared to handle the different parametrization.
+    /// For the exact heuristics, see CheckerContext::isHardenedVariantOf().
+    CLibraryMaybeHardened,
+
     /// Matches "simple" functions that are not methods. (Static methods are
     /// methods.)
     SimpleFunc,
@@ -187,6 +190,9 @@ class CallDescription {
 private:
   bool matchesImpl(const FunctionDecl *Callee, size_t ArgCount,
                    size_t ParamCount) const;
+
+  bool matchNameOnly(const NamedDecl *ND) const;
+  bool matchQualifiedNameParts(const Decl *D) const;
 };
 
 /// An immutable map from CallDescriptions to arbitrary data. Provides a unified

diff --git a/clang/include/clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h b/clang/include/clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h
@@ -366,19 +366,31 @@ class CheckerContext {
     return getCalleeName(FunDecl);
   }
 
-  /// Returns true if the callee is an externally-visible function in the
-  /// top-level namespace, such as \c malloc.
+  /// Returns true if the given function is an externally-visible function in
+  /// the top-level namespace, such as \c malloc.
   ///
   /// If a name is provided, the function must additionally match the given
   /// name.
   ///
-  /// Note that this deliberately excludes C++ library functions in the \c std
-  /// namespace, but will include C library functions accessed through the
-  /// \c std namespace. This also does not check if the function is declared
-  /// as 'extern "C"', or if it uses C++ name mangling.
+  /// Note that this also accepts functions from the \c std namespace (because
+  /// headers like <cstdlib> declare them there) and does not check if the
+  /// function is declared as 'extern "C"' or if it uses C++ name mangling.
   static bool isCLibraryFunction(const FunctionDecl *FD,
                                  StringRef Name = StringRef());
 
+  /// In builds that use source hardening (-D_FORTIFY_SOURCE), many standard
+  /// functions are implemented as macros that expand to calls of hardened
+  /// functions that take additional arguments compared to the "usual"
+  /// variant and perform additional input validation. For example, a `memcpy`
+  /// call may expand to `__memcpy_chk()` or `__builtin___memcpy_chk()`.
+  ///
+  /// This method returns true if `FD` declares a fortified variant of the
+  /// standard library function `Name`.
+  ///
+  /// NOTE: This method relies on heuristics; extend it if you need to handle a
+  /// hardened variant that's not yet covered by it.
+  static bool isHardenedVariantOf(const FunctionDecl *FD, StringRef Name);
+
   /// Depending on wither the location corresponds to a macro, return
   /// either the macro name or the token spelling.
   ///

diff --git a/clang/include/clang/StaticAnalyzer/Core/PathSensitive/SVals.h b/clang/include/clang/StaticAnalyzer/Core/PathSensitive/SVals.h
@@ -232,14 +232,6 @@ class DefinedSVal : public DefinedOrUnknownSVal {
       : DefinedOrUnknownSVal(Kind, Data) {}
 };
 
-/// Represents an SVal that is guaranteed to not be UnknownVal.
-class KnownSVal : public SVal {
-public:
-  /*implicit*/ KnownSVal(DefinedSVal V) : SVal(V) {}
-  /*implicit*/ KnownSVal(UndefinedVal V) : SVal(V) {}
-  static bool classof(SVal V) { return !V.isUnknown(); }
-};
-
 class NonLoc : public DefinedSVal {
 protected:
   NonLoc(SValKind Kind, const void *Data) : DefinedSVal(Kind, Data) {}

diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
@@ -4541,6 +4541,10 @@ ExpectedDecl ASTNodeImporter::VisitVarDecl(VarDecl *D) {
   ToVar->setQualifierInfo(ToQualifierLoc);
   ToVar->setAccess(D->getAccess());
   ToVar->setLexicalDeclContext(LexicalDC);
+  if (D->isInlineSpecified())
+    ToVar->setInlineSpecified();
+  if (D->isInline())
+    ToVar->setImplicitlyInline();
 
   if (FoundByLookup) {
     auto *Recent = const_cast<VarDecl *>(FoundByLookup->getMostRecentDecl());

diff --git a/clang/lib/AST/CMakeLists.txt b/clang/lib/AST/CMakeLists.txt
@@ -98,6 +98,7 @@ add_clang_library(clangAST
   NSAPI.cpp
   ODRDiagsEmitter.cpp
   ODRHash.cpp
+  OpenACCClause.cpp
   OpenMPClause.cpp
   OSLog.cpp
   ParentMap.cpp

diff --git a/clang/lib/AST/ComputeDependence.cpp b/clang/lib/AST/ComputeDependence.cpp
@@ -310,6 +310,16 @@ ExprDependence clang::computeDependence(CXXThisExpr *E) {
   // 'this' is type-dependent if the class type of the enclosing
   // member function is dependent (C++ [temp.dep.expr]p2)
   auto D = toExprDependenceForImpliedType(E->getType()->getDependence());
+
+  // If a lambda with an explicit object parameter captures '*this', then
+  // 'this' now refers to the captured copy of lambda, and if the lambda
+  // is type-dependent, so is the object and thus 'this'.
+  //
+  // Note: The standard does not mention this case explicitly, but we need
+  // to do this so we can mark NSDM accesses as dependent.
+  if (E->isCapturedByCopyInLambdaWithExplicitObjectParameter())
+    D |= ExprDependence::Type;
+
   assert(!(D & ExprDependence::UnexpandedPack));
   return D;
 }

diff --git a/clang/lib/AST/DeclPrinter.cpp b/clang/lib/AST/DeclPrinter.cpp
@@ -21,6 +21,7 @@
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/PrettyPrinter.h"
 #include "clang/Basic/Module.h"
+#include "clang/Basic/SourceManager.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace clang;
 
@@ -49,18 +50,6 @@ namespace {
 
     void PrintObjCTypeParams(ObjCTypeParamList *Params);
 
-    enum class AttrPrintLoc {
-      None = 0,
-      Left = 1,
-      Right = 2,
-      Any = Left | Right,
-
-      LLVM_MARK_AS_BITMASK_ENUM(/*DefaultValue=*/Any)
-    };
-
-    void prettyPrintAttributes(Decl *D, raw_ostream &out,
-                               AttrPrintLoc loc = AttrPrintLoc::Any);
-
   public:
     DeclPrinter(raw_ostream &Out, const PrintingPolicy &Policy,
                 const ASTContext &Context, unsigned Indentation = 0,
@@ -129,11 +118,10 @@ namespace {
                                 const TemplateParameterList *Params);
     void printTemplateArguments(llvm::ArrayRef<TemplateArgumentLoc> Args,
                                 const TemplateParameterList *Params);
-
-    inline void prettyPrintAttributes(Decl *D) {
-      prettyPrintAttributes(D, Out);
-    }
-
+    enum class AttrPosAsWritten { Default = 0, Left, Right };
+    void
+    prettyPrintAttributes(const Decl *D,
+                          AttrPosAsWritten Pos = AttrPosAsWritten::Default);
     void prettyPrintPragmas(Decl *D);
     void printDeclType(QualType T, StringRef DeclName, bool Pack = false);
   };
@@ -250,87 +238,48 @@ raw_ostream& DeclPrinter::Indent(unsigned Indentation) {
   return Out;
 }
 
-// For CLANG_ATTR_LIST_CanPrintOnLeft macro.
-#include "clang/Basic/AttrLeftSideCanPrintList.inc"
+static DeclPrinter::AttrPosAsWritten getPosAsWritten(const Attr *A,
+                                                     const Decl *D) {
+  SourceLocation ALoc = A->getLoc();
+  SourceLocation DLoc = D->getLocation();
+  const ASTContext &C = D->getASTContext();
+  if (ALoc.isInvalid() || DLoc.isInvalid())
+    return DeclPrinter::AttrPosAsWritten::Left;
 
-// For CLANG_ATTR_LIST_PrintOnLeft macro.
-#include "clang/Basic/AttrLeftSideMustPrintList.inc"
+  if (C.getSourceManager().isBeforeInTranslationUnit(ALoc, DLoc))
+    return DeclPrinter::AttrPosAsWritten::Left;
 
-static bool canPrintOnLeftSide(attr::Kind kind) {
-#ifdef CLANG_ATTR_LIST_CanPrintOnLeft
-  switch (kind) {
-  CLANG_ATTR_LIST_CanPrintOnLeft
-    return true;
-  default:
-    return false;
-  }
-#else
-  return false;
-#endif
-}
-
-static bool canPrintOnLeftSide(const Attr *A) {
-  if (A->isStandardAttributeSyntax())
-    return false;
-
-  return canPrintOnLeftSide(A->getKind());
+  return DeclPrinter::AttrPosAsWritten::Right;
 }
 
-static bool mustPrintOnLeftSide(attr::Kind kind) {
-#ifdef CLANG_ATTR_LIST_PrintOnLeft
-  switch (kind) {
-  CLANG_ATTR_LIST_PrintOnLeft
-    return true;
-  default:
-    return false;
-  }
-#else
-  return false;
-#endif
-}
-
-static bool mustPrintOnLeftSide(const Attr *A) {
-  if (A->isDeclspecAttribute())
-    return true;
-
-  return mustPrintOnLeftSide(A->getKind());
-}
-
-void DeclPrinter::prettyPrintAttributes(Decl *D, llvm::raw_ostream &Out,
-                                        AttrPrintLoc Loc) {
+void DeclPrinter::prettyPrintAttributes(const Decl *D,
+                                        AttrPosAsWritten Pos /*=Default*/) {
   if (Policy.PolishForDeclaration)
     return;
 
   if (D->hasAttrs()) {
-    AttrVec &Attrs = D->getAttrs();
+    const AttrVec &Attrs = D->getAttrs();
     for (auto *A : Attrs) {
       if (A->isInherited() || A->isImplicit())
         continue;
-
-      AttrPrintLoc AttrLoc = AttrPrintLoc::Right;
-      if (mustPrintOnLeftSide(A)) {
-        // If we must always print on left side (e.g. declspec), then mark as
-        // so.
-        AttrLoc = AttrPrintLoc::Left;
-      } else if (canPrintOnLeftSide(A)) {
-        // For functions with body defined we print the attributes on the left
-        // side so that GCC accept our dumps as well.
-        if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
-            FD && FD->isThisDeclarationADefinition())
-          // In case Decl is a function with a body, then attrs should be print
-          // on the left side.
-          AttrLoc = AttrPrintLoc::Left;
-
-          // In case it is a variable declaration with a ctor, then allow
-          // printing on the left side for readbility.
-        else if (const VarDecl *VD = dyn_cast<VarDecl>(D);
-                   VD && VD->getInit() &&
-                   VD->getInitStyle() == VarDecl::CallInit)
-          AttrLoc = AttrPrintLoc::Left;
+      switch (A->getKind()) {
+#define ATTR(X)
+#define PRAGMA_SPELLING_ATTR(X) case attr::X:
+#include "clang/Basic/AttrList.inc"
+        break;
+      default:
+        AttrPosAsWritten APos = getPosAsWritten(A, D);
+        assert(APos != AttrPosAsWritten::Default &&
+               "Default not a valid for an attribute location");
+        if (Pos == AttrPosAsWritten::Default || Pos == APos) {
+          if (Pos != AttrPosAsWritten::Left)
+            Out << ' ';
+          A->printPretty(Out, Policy);
+          if (Pos == AttrPosAsWritten::Left)
+            Out << ' ';
+        }
+        break;
       }
-      // Only print the side matches the user requested.
-      if ((Loc & AttrLoc) != AttrPrintLoc::None)
-        A->printPretty(Out, Policy);
     }
   }
 }
@@ -691,8 +640,10 @@ static void MaybePrintTagKeywordIfSupressingScopes(PrintingPolicy &Policy,
 
 void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
   if (!D->getDescribedFunctionTemplate() &&
-      !D->isFunctionTemplateSpecialization())
+      !D->isFunctionTemplateSpecialization()) {
     prettyPrintPragmas(D);
+    prettyPrintAttributes(D, AttrPosAsWritten::Left);
+  }
 
   if (D->isFunctionTemplateSpecialization())
     Out << "template<> ";
@@ -702,22 +653,6 @@ void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
       printTemplateParameters(D->getTemplateParameterList(I));
   }
 
-  std::string LeftsideAttrs;
-  llvm::raw_string_ostream LSAS(LeftsideAttrs);
-
-  prettyPrintAttributes(D, LSAS, AttrPrintLoc::Left);
-
-  // prettyPrintAttributes print a space on left side of the attribute.
-  if (LeftsideAttrs[0] == ' ') {
-    // Skip the space prettyPrintAttributes generated.
-    LeftsideAttrs.erase(0, LeftsideAttrs.find_first_not_of(' '));
-
-    // Add a single space between the attribute and the Decl name.
-    LSAS << ' ';
-  }
-
-  Out << LeftsideAttrs;
-
   CXXConstructorDecl *CDecl = dyn_cast<CXXConstructorDecl>(D);
   CXXConversionDecl *ConversionDecl = dyn_cast<CXXConversionDecl>(D);
   CXXDeductionGuideDecl *GuideDecl = dyn_cast<CXXDeductionGuideDecl>(D);
@@ -883,7 +818,7 @@ void DeclPrinter::VisitFunctionDecl(FunctionDecl *D) {
     Ty.print(Out, Policy, Proto);
   }
 
-  prettyPrintAttributes(D, Out, AttrPrintLoc::Right);
+  prettyPrintAttributes(D, AttrPosAsWritten::Right);
 
   if (D->isPureVirtual())
     Out << " = 0";
@@ -976,27 +911,12 @@ void DeclPrinter::VisitLabelDecl(LabelDecl *D) {
 void DeclPrinter::VisitVarDecl(VarDecl *D) {
   prettyPrintPragmas(D);
 
+  prettyPrintAttributes(D, AttrPosAsWritten::Left);
+
   if (const auto *Param = dyn_cast<ParmVarDecl>(D);
       Param && Param->isExplicitObjectParameter())
     Out << "this ";
 
-  std::string LeftSide;
-  llvm::raw_string_ostream LeftSideStream(LeftSide);
-
-  // Print attributes that should be placed on the left, such as __declspec.
-  prettyPrintAttributes(D, LeftSideStream, AttrPrintLoc::Left);
-
-  // prettyPrintAttributes print a space on left side of the attribute.
-  if (LeftSide[0] == ' ') {
-    // Skip the space prettyPrintAttributes generated.
-    LeftSide.erase(0, LeftSide.find_first_not_of(' '));
-
-    // Add a single space between the attribute and the Decl name.
-    LeftSideStream << ' ';
-  }
-
-  Out << LeftSide;
-
   QualType T = D->getTypeSourceInfo()
     ? D->getTypeSourceInfo()->getType()
     : D->getASTContext().getUnqualifiedObjCPointerType(D->getType());
@@ -1029,21 +949,16 @@ void DeclPrinter::VisitVarDecl(VarDecl *D) {
     }
   }
 
-  StringRef Name;
-
-  Name = (isa<ParmVarDecl>(D) && Policy.CleanUglifiedParameters &&
-          D->getIdentifier())
-             ? D->getIdentifier()->deuglifiedName()
-             : D->getName();
-
   if (!Policy.SuppressTagKeyword && Policy.SuppressScope &&
       !Policy.SuppressUnwrittenScope)
     MaybePrintTagKeywordIfSupressingScopes(Policy, T, Out);
-  printDeclType(T, Name);
 
-  // Print the attributes that should be placed right before the end of the
-  // decl.
-  prettyPrintAttributes(D, Out, AttrPrintLoc::Right);
+  printDeclType(T, (isa<ParmVarDecl>(D) && Policy.CleanUglifiedParameters &&
+                    D->getIdentifier())
+                       ? D->getIdentifier()->deuglifiedName()
+                       : D->getName());
+
+  prettyPrintAttributes(D, AttrPosAsWritten::Right);
 
   Expr *Init = D->getInit();
   if (!Policy.SuppressInitializers && Init) {

diff --git a/clang/lib/AST/Interp/ByteCodeExprGen.cpp b/clang/lib/AST/Interp/ByteCodeExprGen.cpp
@@ -1084,6 +1084,9 @@ static CharUnits AlignOfType(QualType T, const ASTContext &ASTCtx,
   if (const auto *Ref = T->getAs<ReferenceType>())
     T = Ref->getPointeeType();
 
+  if (T.getQualifiers().hasUnaligned())
+    return CharUnits::One();
+
   // __alignof is defined to return the preferred alignment.
   // Before 8, clang returned the preferred alignment for alignof and
   // _Alignof as well.
@@ -2511,6 +2514,7 @@ unsigned ByteCodeExprGen<Emitter>::allocateLocalPrimitive(DeclTy &&Src,
           dyn_cast_if_present<ValueDecl>(Src.dyn_cast<const Decl *>())) {
     assert(!P.getGlobal(VD));
     assert(!Locals.contains(VD));
+    (void)VD;
   }
 
   // FIXME: There are cases where Src.is<Expr*>() is wrong, e.g.

diff --git a/clang/lib/AST/Interp/Disasm.cpp b/clang/lib/AST/Interp/Disasm.cpp
@@ -233,3 +233,34 @@ LLVM_DUMP_METHOD void InterpFrame::dump(llvm::raw_ostream &OS,
     F = F->Caller;
   }
 }
+
+LLVM_DUMP_METHOD void Record::dump(llvm::raw_ostream &OS, unsigned Indentation,
+                                   unsigned Offset) const {
+  unsigned Indent = Indentation * 2;
+  OS.indent(Indent);
+  {
+    ColorScope SC(OS, true, {llvm::raw_ostream::BLUE, true});
+    OS << getName() << "\n";
+  }
+
+  unsigned I = 0;
+  for (const Record::Base &B : bases()) {
+    OS.indent(Indent) << "- Base " << I << ". Offset " << (Offset + B.Offset)
+                      << "\n";
+    B.R->dump(OS, Indentation + 1, Offset + B.Offset);
+    ++I;
+  }
+
+  // FIXME: Virtual bases.
+
+  I = 0;
+  for (const Record::Field &F : fields()) {
+    OS.indent(Indent) << "- Field " << I << ": ";
+    {
+      ColorScope SC(OS, true, {llvm::raw_ostream::BRIGHT_RED, true});
+      OS << F.Decl->getName();
+    }
+    OS << ". Offset " << (Offset + F.Offset) << "\n";
+    ++I;
+  }
+}
diff --git a/clang/lib/AST/Interp/Interp.h b/clang/lib/AST/Interp/Interp.h
@@ -801,6 +801,18 @@ inline bool CmpHelperEQ<Pointer>(InterpState &S, CodePtr OpPC, CompareFn Fn) {
     return true;
   }
 
+  for (const auto &P : {LHS, RHS}) {
+    if (P.isZero())
+      continue;
+    if (const ValueDecl *VD = P.getDeclDesc()->asValueDecl();
+        VD && VD->isWeak()) {
+      const SourceInfo &Loc = S.Current->getSource(OpPC);
+      S.FFDiag(Loc, diag::note_constexpr_pointer_weak_comparison)
+          << P.toDiagnosticString(S.getCtx());
+      return false;
+    }
+  }
+
   if (!Pointer::hasSameBase(LHS, RHS)) {
     S.Stk.push<BoolT>(BoolT::from(Fn(ComparisonCategoryResult::Unordered)));
     return true;
@@ -1333,6 +1345,11 @@ inline bool FinishInit(InterpState &S, CodePtr OpPC) {
   return true;
 }
 
+inline bool Dump(InterpState &S, CodePtr OpPC) {
+  S.Stk.dump();
+  return true;
+}
+
 inline bool VirtBaseHelper(InterpState &S, CodePtr OpPC, const RecordDecl *Decl,
                            const Pointer &Ptr) {
   Pointer Base = Ptr;
@@ -1841,6 +1858,15 @@ inline bool This(InterpState &S, CodePtr OpPC) {
   if (!CheckThis(S, OpPC, This))
     return false;
 
+  // Ensure the This pointer has been cast to the correct base.
+  if (!This.isDummy()) {
+    assert(isa<CXXMethodDecl>(S.Current->getFunction()->getDecl()));
+    assert(This.getRecord());
+    assert(
+        This.getRecord()->getDecl() ==
+        cast<CXXMethodDecl>(S.Current->getFunction()->getDecl())->getParent());
+  }
+
   S.Stk.push<Pointer>(This);
   return true;
 }

diff --git a/clang/lib/AST/Interp/Opcodes.td b/clang/lib/AST/Interp/Opcodes.td
@@ -723,3 +723,8 @@ def CheckNonNullArg : Opcode {
 }
 
 def Memcpy : Opcode;
+
+//===----------------------------------------------------------------------===//
+// Debugging.
+//===----------------------------------------------------------------------===//
+def Dump : Opcode;
diff --git a/clang/lib/AST/Interp/Pointer.cpp b/clang/lib/AST/Interp/Pointer.cpp
@@ -177,6 +177,10 @@ void Pointer::initialize() const {
     if (isStatic() && Base == 0)
       return;
 
+    // Nothing to do for these.
+    if (Desc->getNumElems() == 0)
+      return;
+
     InitMapPtr &IM = getInitMap();
     if (!IM)
       IM =

diff --git a/clang/lib/AST/Interp/Record.cpp b/clang/lib/AST/Interp/Record.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "Record.h"
+#include "clang/AST/ASTContext.h"
 
 using namespace clang;
 using namespace clang::interp;
@@ -27,6 +28,14 @@ Record::Record(const RecordDecl *Decl, BaseList &&SrcBases,
     VirtualBaseMap[V.Decl] = &V;
 }
 
+const std::string Record::getName() const {
+  std::string Ret;
+  llvm::raw_string_ostream OS(Ret);
+  Decl->getNameForDiagnostic(OS, Decl->getASTContext().getPrintingPolicy(),
+                             /*Qualified=*/true);
+  return Ret;
+}
+
 const Record::Field *Record::getField(const FieldDecl *FD) const {
   auto It = FieldMap.find(FD);
   assert(It != FieldMap.end() && "Missing field");

diff --git a/clang/lib/AST/Interp/Record.h b/clang/lib/AST/Interp/Record.h
@@ -51,7 +51,7 @@ class Record final {
   /// Returns the underlying declaration.
   const RecordDecl *getDecl() const { return Decl; }
   /// Returns the name of the underlying declaration.
-  const std::string getName() const { return Decl->getNameAsString(); }
+  const std::string getName() const;
   /// Checks if the record is a union.
   bool isUnion() const { return getDecl()->isUnion(); }
   /// Returns the size of the record.
@@ -100,6 +100,10 @@ class Record final {
   unsigned getNumVirtualBases() const { return VirtualBases.size(); }
   const Base *getVirtualBase(unsigned I) const { return &VirtualBases[I]; }
 
+  void dump(llvm::raw_ostream &OS, unsigned Indentation = 0,
+            unsigned Offset = 0) const;
+  void dump() const { dump(llvm::errs()); }
+
 private:
   /// Constructor used by Program to create record descriptors.
   Record(const RecordDecl *, BaseList &&Bases, FieldList &&Fields,

diff --git a/clang/lib/AST/JSONNodeDumper.cpp b/clang/lib/AST/JSONNodeDumper.cpp
@@ -187,6 +187,8 @@ void JSONNodeDumper::Visit(const CXXCtorInitializer *Init) {
     llvm_unreachable("Unknown initializer type");
 }
 
+void JSONNodeDumper::Visit(const OpenACCClause *C) {}
+
 void JSONNodeDumper::Visit(const OMPClause *C) {}
 
 void JSONNodeDumper::Visit(const BlockDecl::Capture &C) {

diff --git a/clang/lib/AST/OpenACCClause.cpp b/clang/lib/AST/OpenACCClause.cpp
@@ -0,0 +1,17 @@
+//===---- OpenACCClause.cpp - Classes for OpenACC Clauses  ----------------===//
+//
+// 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 implements the subclasses of the OpenACCClause class declared in
+// OpenACCClause.h
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/OpenACCClause.h"
+#include "clang/AST/ASTContext.h"
+
+using namespace clang;
diff --git a/clang/lib/AST/StmtOpenACC.cpp b/clang/lib/AST/StmtOpenACC.cpp
@@ -15,20 +15,23 @@
 using namespace clang;
 
 OpenACCComputeConstruct *
-OpenACCComputeConstruct::CreateEmpty(const ASTContext &C, EmptyShell) {
-  void *Mem = C.Allocate(sizeof(OpenACCComputeConstruct),
-                         alignof(OpenACCComputeConstruct));
-  auto *Inst = new (Mem) OpenACCComputeConstruct;
+OpenACCComputeConstruct::CreateEmpty(const ASTContext &C, unsigned NumClauses) {
+  void *Mem = C.Allocate(
+      OpenACCComputeConstruct::totalSizeToAlloc<const OpenACCClause *>(
+          NumClauses));
+  auto *Inst = new (Mem) OpenACCComputeConstruct(NumClauses);
   return Inst;
 }
 
 OpenACCComputeConstruct *
 OpenACCComputeConstruct::Create(const ASTContext &C, OpenACCDirectiveKind K,
                                 SourceLocation BeginLoc, SourceLocation EndLoc,
+                                ArrayRef<const OpenACCClause *> Clauses,
                                 Stmt *StructuredBlock) {
-  void *Mem = C.Allocate(sizeof(OpenACCComputeConstruct),
-                         alignof(OpenACCComputeConstruct));
-  auto *Inst =
-      new (Mem) OpenACCComputeConstruct(K, BeginLoc, EndLoc, StructuredBlock);
+  void *Mem = C.Allocate(
+      OpenACCComputeConstruct::totalSizeToAlloc<const OpenACCClause *>(
+          Clauses.size()));
+  auto *Inst = new (Mem)
+      OpenACCComputeConstruct(K, BeginLoc, EndLoc, Clauses, StructuredBlock);
   return Inst;
 }
diff --git a/clang/lib/AST/StmtPrinter.cpp b/clang/lib/AST/StmtPrinter.cpp
@@ -292,8 +292,11 @@ void StmtPrinter::VisitLabelStmt(LabelStmt *Node) {
 }
 
 void StmtPrinter::VisitAttributedStmt(AttributedStmt *Node) {
-  for (const auto *Attr : Node->getAttrs()) {
+  llvm::ArrayRef<const Attr *> Attrs = Node->getAttrs();
+  for (const auto *Attr : Attrs) {
     Attr->printPretty(OS, Policy);
+    if (Attr != Attrs.back())
+      OS << ' ';
   }
 
   PrintStmt(Node->getSubStmt(), 0);
@@ -1142,7 +1145,13 @@ void StmtPrinter::VisitOMPTargetParallelGenericLoopDirective(
 //===----------------------------------------------------------------------===//
 void StmtPrinter::VisitOpenACCComputeConstruct(OpenACCComputeConstruct *S) {
   Indent() << "#pragma acc " << S->getDirectiveKind();
-  // TODO OpenACC: Print Clauses.
+
+  if (!S->clauses().empty()) {
+    OS << ' ';
+    OpenACCClausePrinter Printer(OS);
+    Printer.VisitClauseList(S->clauses());
+  }
+
   PrintStmt(S->getStructuredBlock());
 }
 

diff --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
@@ -2011,6 +2011,7 @@ void StmtProfiler::VisitMSPropertySubscriptExpr(
 void StmtProfiler::VisitCXXThisExpr(const CXXThisExpr *S) {
   VisitExpr(S);
   ID.AddBoolean(S->isImplicit());
+  ID.AddBoolean(S->isCapturedByCopyInLambdaWithExplicitObjectParameter());
 }
 
 void StmtProfiler::VisitCXXThrowExpr(const CXXThrowExpr *S) {
@@ -2441,11 +2442,30 @@ void StmtProfiler::VisitTemplateArgument(const TemplateArgument &Arg) {
   }
 }
 
+namespace {
+class OpenACCClauseProfiler
+    : public OpenACCClauseVisitor<OpenACCClauseProfiler> {
+
+public:
+  OpenACCClauseProfiler() = default;
+
+  void VisitOpenACCClauseList(ArrayRef<const OpenACCClause *> Clauses) {
+    for (const OpenACCClause *Clause : Clauses) {
+      // TODO OpenACC: When we have clauses with expressions, we should
+      // profile them too.
+      Visit(Clause);
+    }
+  }
+};
+} // namespace
+
 void StmtProfiler::VisitOpenACCComputeConstruct(
     const OpenACCComputeConstruct *S) {
   // VisitStmt handles children, so the AssociatedStmt is handled.
   VisitStmt(S);
-  // TODO OpenACC: Visit Clauses.
+
+  OpenACCClauseProfiler P;
+  P.VisitOpenACCClauseList(S->clauses());
 }
 
 void Stmt::Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,

diff --git a/clang/lib/AST/TextNodeDumper.cpp b/clang/lib/AST/TextNodeDumper.cpp
@@ -381,6 +381,20 @@ void TextNodeDumper::Visit(const OMPClause *C) {
     OS << " <implicit>";
 }
 
+void TextNodeDumper::Visit(const OpenACCClause *C) {
+  if (!C) {
+    ColorScope Color(OS, ShowColors, NullColor);
+    OS << "<<<NULL>>> OpenACCClause";
+    return;
+  }
+  {
+    ColorScope Color(OS, ShowColors, AttrColor);
+    OS << C->getClauseKind();
+  }
+  dumpPointer(C);
+  dumpSourceRange(SourceRange(C->getBeginLoc(), C->getEndLoc()));
+}
+
 void TextNodeDumper::Visit(const GenericSelectionExpr::ConstAssociation &A) {
   const TypeSourceInfo *TSI = A.getTypeSourceInfo();
   if (TSI) {
@@ -1180,8 +1194,11 @@ void TextNodeDumper::VisitDeclRefExpr(const DeclRefExpr *Node) {
   case NOUR_Constant: OS << " non_odr_use_constant"; break;
   case NOUR_Discarded: OS << " non_odr_use_discarded"; break;
   }
-  if (Node->refersToEnclosingVariableOrCapture())
+  if (Node->isCapturedByCopyInLambdaWithExplicitObjectParameter())
+    OS << " dependent_capture";
+  else if (Node->refersToEnclosingVariableOrCapture())
     OS << " refers_to_enclosing_variable_or_capture";
+
   if (Node->isImmediateEscalating())
     OS << " immediate-escalating";
 }
@@ -1337,6 +1354,8 @@ void TextNodeDumper::VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *Node) {
 void TextNodeDumper::VisitCXXThisExpr(const CXXThisExpr *Node) {
   if (Node->isImplicit())
     OS << " implicit";
+  if (Node->isCapturedByCopyInLambdaWithExplicitObjectParameter())
+    OS << " dependent_capture";
   OS << " this";
 }
 
@@ -2684,5 +2703,4 @@ void TextNodeDumper::VisitHLSLBufferDecl(const HLSLBufferDecl *D) {
 
 void TextNodeDumper::VisitOpenACCConstructStmt(const OpenACCConstructStmt *S) {
   OS << " " << S->getDirectiveKind();
-  // TODO OpenACC: Dump clauses as well.
 }
diff --git a/clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp b/clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp
@@ -850,6 +850,7 @@ void Environment::setValue(const Expr &E, Value &Val) {
   if (auto *RecordVal = dyn_cast<RecordValue>(&Val)) {
     assert(isOriginalRecordConstructor(CanonE) ||
            &RecordVal->getLoc() == &getResultObjectLocation(CanonE));
+    (void)RecordVal;
   }
 
   assert(CanonE.isPRValue());

diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
@@ -73,18 +73,17 @@
 #include "llvm/Transforms/Instrumentation/HWAddressSanitizer.h"
 #include "llvm/Transforms/Instrumentation/InstrProfiling.h"
 #include "llvm/Transforms/Instrumentation/KCFI.h"
+#include "llvm/Transforms/Instrumentation/LowerAllowCheckPass.h"
 #include "llvm/Transforms/Instrumentation/MemProfiler.h"
 #include "llvm/Transforms/Instrumentation/MemorySanitizer.h"
 #include "llvm/Transforms/Instrumentation/PGOInstrumentation.h"
-#include "llvm/Transforms/Instrumentation/RemoveTrapsPass.h"
 #include "llvm/Transforms/Instrumentation/SanitizerBinaryMetadata.h"
 #include "llvm/Transforms/Instrumentation/SanitizerCoverage.h"
 #include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"
 #include "llvm/Transforms/ObjCARC.h"
 #include "llvm/Transforms/Scalar/EarlyCSE.h"
 #include "llvm/Transforms/Scalar/GVN.h"
 #include "llvm/Transforms/Scalar/JumpThreading.h"
-#include "llvm/Transforms/Scalar/SimplifyCFG.h"
 #include "llvm/Transforms/Utils/Debugify.h"
 #include "llvm/Transforms/Utils/EntryExitInstrumenter.h"
 #include "llvm/Transforms/Utils/ModuleUtils.h"
@@ -747,18 +746,13 @@ static void addSanitizers(const Triple &TargetTriple,
     PB.registerOptimizerLastEPCallback(SanitizersCallback);
   }
 
-  if (RemoveTrapsPass::IsRequested()) {
+  if (LowerAllowCheckPass::IsRequested()) {
     // We can optimize after inliner, and PGO profile matching. The hook below
     // is called at the end `buildFunctionSimplificationPipeline`, which called
     // from `buildInlinerPipeline`, which called after profile matching.
     PB.registerScalarOptimizerLateEPCallback(
         [](FunctionPassManager &FPM, OptimizationLevel Level) {
-          // RemoveTrapsPass expects trap blocks preceded by conditional
-          // branches, which usually is not the case without SimplifyCFG.
-          // TODO: Remove `SimplifyCFGPass` after switching to dedicated
-          // intrinsic.
-          FPM.addPass(SimplifyCFGPass());
-          FPM.addPass(RemoveTrapsPass());
+          FPM.addPass(LowerAllowCheckPass());
         });
   }
 }

diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -13,6 +13,7 @@
 #include "ABIInfo.h"
 #include "CGCUDARuntime.h"
 #include "CGCXXABI.h"
+#include "CGHLSLRuntime.h"
 #include "CGObjCRuntime.h"
 #include "CGOpenCLRuntime.h"
 #include "CGRecordLayout.h"
@@ -3439,12 +3440,9 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
     StringRef Kind =
         cast<StringLiteral>(E->getArg(0)->IgnoreParenCasts())->getString();
     LLVMContext &Ctx = CGM.getLLVMContext();
-    llvm::Metadata *KindStr[] = {llvm::MDString::get(Ctx, Kind)};
-    llvm::MDNode *KindNode = llvm::MDNode::get(Ctx, KindStr);
-    llvm::Value *KindMD = llvm::MetadataAsValue::get(Ctx, KindNode);
     llvm::Value *Allow = Builder.CreateCall(
-        CGM.getIntrinsic(llvm::Intrinsic::allow_runtime_check), KindMD);
-
+        CGM.getIntrinsic(llvm::Intrinsic::allow_runtime_check),
+        llvm::MetadataAsValue::get(Ctx, llvm::MDString::get(Ctx, Kind)));
     return RValue::get(Allow);
   }
   case Builtin::BI__arithmetic_fence: {
@@ -17299,6 +17297,16 @@ Value *CodeGenFunction::EmitPPCBuiltinExpr(unsigned BuiltinID,
     Value *Op1 = EmitScalarExpr(E->getArg(1));
     Value *Op2 = EmitScalarExpr(E->getArg(2));
     Value *Op3 = EmitScalarExpr(E->getArg(3));
+    // rldimi is 64-bit instruction, expand the intrinsic before isel to
+    // leverage peephole and avoid legalization efforts.
+    if (BuiltinID == PPC::BI__builtin_ppc_rldimi &&
+        !getTarget().getTriple().isPPC64()) {
+      Function *F = CGM.getIntrinsic(Intrinsic::fshl, Op0->getType());
+      Op2 = Builder.CreateZExt(Op2, Int64Ty);
+      Value *Shift = Builder.CreateCall(F, {Op0, Op0, Op2});
+      return Builder.CreateOr(Builder.CreateAnd(Shift, Op3),
+                              Builder.CreateAnd(Op1, Builder.CreateNot(Op3)));
+    }
     return Builder.CreateCall(
         CGM.getIntrinsic(BuiltinID == PPC::BI__builtin_ppc_rldimi
                              ? Intrinsic::ppc_rldimi
@@ -18184,6 +18192,13 @@ Value *CodeGenFunction::EmitHLSLBuiltinExpr(unsigned BuiltinID,
     return nullptr;
 
   switch (BuiltinID) {
+  case Builtin::BI__builtin_hlsl_elementwise_all: {
+    Value *Op0 = EmitScalarExpr(E->getArg(0));
+    return Builder.CreateIntrinsic(
+        /*ReturnType=*/llvm::Type::getInt1Ty(getLLVMContext()),
+        CGM.getHLSLRuntime().getAllIntrinsic(), ArrayRef<Value *>{Op0}, nullptr,
+        "hlsl.all");
+  }
   case Builtin::BI__builtin_hlsl_elementwise_any: {
     Value *Op0 = EmitScalarExpr(E->getArg(0));
     return Builder.CreateIntrinsic(

diff --git a/clang/lib/CodeGen/CGClass.cpp b/clang/lib/CodeGen/CGClass.cpp
@@ -1404,7 +1404,7 @@ FieldHasTrivialDestructorBody(ASTContext &Context,
 
   // The destructor for an implicit anonymous union member is never invoked.
   if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion())
-    return false;
+    return true;
 
   return HasTrivialDestructorBody(Context, FieldClassDecl, FieldClassDecl);
 }

diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
@@ -5597,11 +5597,44 @@ LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
       break;
     }
 
-    RValue RV = EmitAnyExpr(E->getRHS());
+    // TODO: Can we de-duplicate this code with the corresponding code in
+    // CGExprScalar, similar to the way EmitCompoundAssignmentLValue works?
+    RValue RV;
+    llvm::Value *Previous = nullptr;
+    QualType SrcType = E->getRHS()->getType();
+    // Check if LHS is a bitfield, if RHS contains an implicit cast expression
+    // we want to extract that value and potentially (if the bitfield sanitizer
+    // is enabled) use it to check for an implicit conversion.
+    if (E->getLHS()->refersToBitField()) {
+      llvm::Value *RHS =
+          EmitWithOriginalRHSBitfieldAssignment(E, &Previous, &SrcType);
+      RV = RValue::get(RHS);
+    } else
+      RV = EmitAnyExpr(E->getRHS());
+
     LValue LV = EmitCheckedLValue(E->getLHS(), TCK_Store);
+
     if (RV.isScalar())
       EmitNullabilityCheck(LV, RV.getScalarVal(), E->getExprLoc());
-    EmitStoreThroughLValue(RV, LV);
+
+    if (LV.isBitField()) {
+      llvm::Value *Result = nullptr;
+      // If bitfield sanitizers are enabled we want to use the result
+      // to check whether a truncation or sign change has occurred.
+      if (SanOpts.has(SanitizerKind::ImplicitBitfieldConversion))
+        EmitStoreThroughBitfieldLValue(RV, LV, &Result);
+      else
+        EmitStoreThroughBitfieldLValue(RV, LV);
+
+      // If the expression contained an implicit conversion, make sure
+      // to use the value before the scalar conversion.
+      llvm::Value *Src = Previous ? Previous : RV.getScalarVal();
+      QualType DstType = E->getLHS()->getType();
+      EmitBitfieldConversionCheck(Src, SrcType, Result, DstType,
+                                  LV.getBitFieldInfo(), E->getExprLoc());
+    } else
+      EmitStoreThroughLValue(RV, LV);
+
     if (getLangOpts().OpenMP)
       CGM.getOpenMPRuntime().checkAndEmitLastprivateConditional(*this,
                                                                 E->getLHS());

diff --git a/clang/lib/CodeGen/CGExprScalar.cpp b/clang/lib/CodeGen/CGExprScalar.cpp
diff --git a/clang/lib/CodeGen/CGHLSLRuntime.cpp b/clang/lib/CodeGen/CGHLSLRuntime.cpp
@@ -17,8 +17,6 @@
 #include "CodeGenModule.h"
 #include "clang/AST/Decl.h"
 #include "clang/Basic/TargetOptions.h"
-#include "llvm/IR/IntrinsicsDirectX.h"
-#include "llvm/IR/IntrinsicsSPIRV.h"
 #include "llvm/IR/Metadata.h"
 #include "llvm/IR/Module.h"
 #include "llvm/Support/FormatVariadic.h"
@@ -117,6 +115,10 @@ GlobalVariable *replaceBuffer(CGHLSLRuntime::Buffer &Buf) {
 
 } // namespace
 
+llvm::Triple::ArchType CGHLSLRuntime::getArch() {
+  return CGM.getTarget().getTriple().getArch();
+}
+
 void CGHLSLRuntime::addConstant(VarDecl *D, Buffer &CB) {
   if (D->getStorageClass() == SC_Static) {
     // For static inside cbuffer, take as global static.
@@ -343,18 +345,8 @@ llvm::Value *CGHLSLRuntime::emitInputSemantic(IRBuilder<> &B,
     return B.CreateCall(FunctionCallee(DxGroupIndex));
   }
   if (D.hasAttr<HLSLSV_DispatchThreadIDAttr>()) {
-    llvm::Function *ThreadIDIntrinsic;
-    switch (CGM.getTarget().getTriple().getArch()) {
-    case llvm::Triple::dxil:
-      ThreadIDIntrinsic = CGM.getIntrinsic(Intrinsic::dx_thread_id);
-      break;
-    case llvm::Triple::spirv:
-      ThreadIDIntrinsic = CGM.getIntrinsic(Intrinsic::spv_thread_id);
-      break;
-    default:
-      llvm_unreachable("Input semantic not supported by target");
-      break;
-    }
+    llvm::Function *ThreadIDIntrinsic =
+        CGM.getIntrinsic(getThreadIdIntrinsic());
     return buildVectorInput(B, ThreadIDIntrinsic, Ty);
   }
   assert(false && "Unhandled parameter attribute");

diff --git a/clang/lib/CodeGen/CGHLSLRuntime.h b/clang/lib/CodeGen/CGHLSLRuntime.h
@@ -16,7 +16,11 @@
 #define LLVM_CLANG_LIB_CODEGEN_CGHLSLRUNTIME_H
 
 #include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/IR/IntrinsicsDirectX.h"
+#include "llvm/IR/IntrinsicsSPIRV.h"
 
+#include "clang/Basic/Builtins.h"
 #include "clang/Basic/HLSLRuntime.h"
 
 #include "llvm/ADT/SmallVector.h"
@@ -26,6 +30,22 @@
 #include <optional>
 #include <vector>
 
+// A function generator macro for picking the right intrinsic
+// for the target backend
+#define GENERATE_HLSL_INTRINSIC_FUNCTION(FunctionName, IntrinsicPostfix)       \
+  llvm::Intrinsic::ID get##FunctionName##Intrinsic() {                         \
+    llvm::Triple::ArchType Arch = getArch();                                   \
+    switch (Arch) {                                                            \
+    case llvm::Triple::dxil:                                                   \
+      return llvm::Intrinsic::dx_##IntrinsicPostfix;                           \
+    case llvm::Triple::spirv:                                                  \
+      return llvm::Intrinsic::spv_##IntrinsicPostfix;                          \
+    default:                                                                   \
+      llvm_unreachable("Intrinsic " #IntrinsicPostfix                          \
+                       " not supported by target architecture");               \
+    }                                                                          \
+  }
+
 namespace llvm {
 class GlobalVariable;
 class Function;
@@ -48,6 +68,17 @@ class CodeGenModule;
 
 class CGHLSLRuntime {
 public:
+  //===----------------------------------------------------------------------===//
+  // Start of reserved area for HLSL intrinsic getters.
+  //===----------------------------------------------------------------------===//
+
+  GENERATE_HLSL_INTRINSIC_FUNCTION(All, all)
+  GENERATE_HLSL_INTRINSIC_FUNCTION(ThreadId, thread_id)
+
+  //===----------------------------------------------------------------------===//
+  // End of reserved area for HLSL intrinsic getters.
+  //===----------------------------------------------------------------------===//
+
   struct BufferResBinding {
     // The ID like 2 in register(b2, space1).
     std::optional<unsigned> Reg;
@@ -96,6 +127,7 @@ class CGHLSLRuntime {
                                    BufferResBinding &Binding);
   void addConstant(VarDecl *D, Buffer &CB);
   void addBufferDecls(const DeclContext *DC, Buffer &CB);
+  llvm::Triple::ArchType getArch();
   llvm::SmallVector<Buffer> Buffers;
 };
 

diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
@@ -2786,6 +2786,21 @@ class CodeGenFunction : public CodeGenTypeCache {
   /// expression and compare the result against zero, returning an Int1Ty value.
   llvm::Value *EvaluateExprAsBool(const Expr *E);
 
+  /// Retrieve the implicit cast expression of the rhs in a binary operator
+  /// expression by passing pointers to Value and QualType
+  /// This is used for implicit bitfield conversion checks, which
+  /// must compare with the value before potential truncation.
+  llvm::Value *EmitWithOriginalRHSBitfieldAssignment(const BinaryOperator *E,
+                                                     llvm::Value **Previous,
+                                                     QualType *SrcType);
+
+  /// Emit a check that an [implicit] conversion of a bitfield. It is not UB,
+  /// so we use the value after conversion.
+  void EmitBitfieldConversionCheck(llvm::Value *Src, QualType SrcType,
+                                   llvm::Value *Dst, QualType DstType,
+                                   const CGBitFieldInfo &Info,
+                                   SourceLocation Loc);
+
   /// EmitIgnoredExpr - Emit an expression in a context which ignores the result.
   void EmitIgnoredExpr(const Expr *E);
 

diff --git a/clang/lib/CodeGen/CodeGenTBAA.cpp b/clang/lib/CodeGen/CodeGenTBAA.cpp
@@ -22,6 +22,7 @@
 #include "clang/AST/Mangle.h"
 #include "clang/AST/RecordLayout.h"
 #include "clang/Basic/CodeGenOptions.h"
+#include "clang/Basic/TargetInfo.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/LLVMContext.h"
@@ -97,8 +98,6 @@ static bool TypeHasMayAlias(QualType QTy) {
 
 /// Check if the given type is a valid base type to be used in access tags.
 static bool isValidBaseType(QualType QTy) {
-  if (QTy->isReferenceType())
-    return false;
   if (const RecordType *TTy = QTy->getAs<RecordType>()) {
     const RecordDecl *RD = TTy->getDecl()->getDefinition();
     // Incomplete types are not valid base access types.
@@ -242,9 +241,10 @@ llvm::MDNode *CodeGenTBAA::getTypeInfo(QualType QTy) {
   // aggregate will result into the may-alias access descriptor, meaning all
   // subsequent accesses to direct and indirect members of that aggregate will
   // be considered may-alias too.
-  // TODO: Combine getTypeInfo() and getBaseTypeInfo() into a single function.
+  // TODO: Combine getTypeInfo() and getValidBaseTypeInfo() into a single
+  // function.
   if (isValidBaseType(QTy))
-    return getBaseTypeInfo(QTy);
+    return getValidBaseTypeInfo(QTy);
 
   const Type *Ty = Context.getCanonicalType(QTy).getTypePtr();
   if (llvm::MDNode *N = MetadataCache[Ty])
@@ -319,7 +319,13 @@ CodeGenTBAA::CollectFields(uint64_t BaseOffset,
       // base type.
       if ((*i)->isBitField()) {
         const CGBitFieldInfo &Info = CGRL.getBitFieldInfo(*i);
-        if (Info.Offset != 0)
+        // For big endian targets the first bitfield in the consecutive run is
+        // at the most-significant end; see CGRecordLowering::setBitFieldInfo
+        // for more information.
+        bool IsBE = Context.getTargetInfo().isBigEndian();
+        bool IsFirst = IsBE ? Info.StorageSize - (Info.Offset + Info.Size) == 0
+                            : Info.Offset == 0;
+        if (!IsFirst)
           continue;
         unsigned CurrentBitFieldSize = Info.StorageSize;
         uint64_t Size =
@@ -387,7 +393,7 @@ llvm::MDNode *CodeGenTBAA::getBaseTypeInfoHelper(const Type *Ty) {
         if (BaseRD->isEmpty())
           continue;
         llvm::MDNode *TypeNode = isValidBaseType(BaseQTy)
-                                     ? getBaseTypeInfo(BaseQTy)
+                                     ? getValidBaseTypeInfo(BaseQTy)
                                      : getTypeInfo(BaseQTy);
         if (!TypeNode)
           return nullptr;
@@ -411,8 +417,9 @@ llvm::MDNode *CodeGenTBAA::getBaseTypeInfoHelper(const Type *Ty) {
       if (Field->isZeroSize(Context) || Field->isUnnamedBitfield())
         continue;
       QualType FieldQTy = Field->getType();
-      llvm::MDNode *TypeNode = isValidBaseType(FieldQTy) ?
-          getBaseTypeInfo(FieldQTy) : getTypeInfo(FieldQTy);
+      llvm::MDNode *TypeNode = isValidBaseType(FieldQTy)
+                                   ? getValidBaseTypeInfo(FieldQTy)
+                                   : getTypeInfo(FieldQTy);
       if (!TypeNode)
         return nullptr;
 
@@ -449,9 +456,8 @@ llvm::MDNode *CodeGenTBAA::getBaseTypeInfoHelper(const Type *Ty) {
   return nullptr;
 }
 
-llvm::MDNode *CodeGenTBAA::getBaseTypeInfo(QualType QTy) {
-  if (!isValidBaseType(QTy))
-    return nullptr;
+llvm::MDNode *CodeGenTBAA::getValidBaseTypeInfo(QualType QTy) {
+  assert(isValidBaseType(QTy) && "Must be a valid base type");
 
   const Type *Ty = Context.getCanonicalType(QTy).getTypePtr();
 
@@ -470,6 +476,10 @@ llvm::MDNode *CodeGenTBAA::getBaseTypeInfo(QualType QTy) {
   return TypeNode;
 }
 
+llvm::MDNode *CodeGenTBAA::getBaseTypeInfo(QualType QTy) {
+  return isValidBaseType(QTy) ? getValidBaseTypeInfo(QTy) : nullptr;
+}
+
 llvm::MDNode *CodeGenTBAA::getAccessTagInfo(TBAAAccessInfo Info) {
   assert(!Info.isIncomplete() && "Access to an object of an incomplete type!");
 

diff --git a/clang/lib/CodeGen/CodeGenTBAA.h b/clang/lib/CodeGen/CodeGenTBAA.h
@@ -168,6 +168,10 @@ class CodeGenTBAA {
   /// used to describe accesses to objects of the given base type.
   llvm::MDNode *getBaseTypeInfoHelper(const Type *Ty);
 
+  /// getValidBaseTypeInfo - Return metadata that describes the given base
+  /// access type. The type must be suitable.
+  llvm::MDNode *getValidBaseTypeInfo(QualType QTy);
+
 public:
   CodeGenTBAA(ASTContext &Ctx, CodeGenTypes &CGTypes, llvm::Module &M,
               const CodeGenOptions &CGO, const LangOptions &Features,
@@ -190,8 +194,9 @@ class CodeGenTBAA {
   /// the given type.
   llvm::MDNode *getTBAAStructInfo(QualType QTy);
 
-  /// getBaseTypeInfo - Get metadata that describes the given base access type.
-  /// Return null if the type is not suitable for use in TBAA access tags.
+  /// getBaseTypeInfo - Get metadata that describes the given base access
+  /// type. Return null if the type is not suitable for use in TBAA access
+  /// tags.
   llvm::MDNode *getBaseTypeInfo(QualType QTy);
 
   /// getAccessTagInfo - Get TBAA tag for a given memory access.

diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
@@ -2003,6 +2003,12 @@ void Driver::PrintVersion(const Compilation &C, raw_ostream &OS) const {
   // Print out the install directory.
   OS << "InstalledDir: " << Dir << '\n';
 
+  // Print the build config if it's non-default.
+  // Intended to help LLVM developers understand the configs of compilers
+  // they're investigating.
+  if (!llvm::cl::getCompilerBuildConfig().empty())
+    llvm::cl::printBuildConfig(OS);
+
   // If configuration files were used, print their paths.
   for (auto ConfigFile : ConfigFiles)
     OS << "Configuration file: " << ConfigFile << '\n';

diff --git a/clang/lib/Driver/ToolChain.cpp b/clang/lib/Driver/ToolChain.cpp
@@ -796,7 +796,13 @@ ToolChain::getTargetSubDirPath(StringRef BaseDir) const {
 std::optional<std::string> ToolChain::getRuntimePath() const {
   SmallString<128> P(D.ResourceDir);
   llvm::sys::path::append(P, "lib");
-  return getTargetSubDirPath(P);
+  if (auto Ret = getTargetSubDirPath(P))
+    return Ret;
+  // Darwin does not use per-target runtime directory.
+  if (Triple.isOSDarwin())
+    return {};
+  llvm::sys::path::append(P, Triple.str());
+  return std::string(P);
 }
 
 std::optional<std::string> ToolChain::getStdlibPath() const {

diff --git a/clang/lib/Driver/ToolChains/AIX.cpp b/clang/lib/Driver/ToolChains/AIX.cpp
@@ -17,6 +17,8 @@
 #include "llvm/ProfileData/InstrProf.h"
 #include "llvm/Support/Path.h"
 
+#include <set>
+
 using AIX = clang::driver::toolchains::AIX;
 using namespace clang::driver;
 using namespace clang::driver::tools;

diff --git a/clang/lib/Driver/ToolChains/Arch/AArch64.cpp b/clang/lib/Driver/ToolChains/Arch/AArch64.cpp
@@ -402,9 +402,6 @@ void aarch64::getAArch64TargetFeatures(const Driver &D,
   if (Args.hasArg(options::OPT_ffixed_x28))
     Features.push_back("+reserve-x28");
 
-  if (Args.hasArg(options::OPT_ffixed_x30))
-    Features.push_back("+reserve-x30");
-
   if (Args.hasArg(options::OPT_fcall_saved_x8))
     Features.push_back("+call-saved-x8");
 

diff --git a/clang/lib/Driver/ToolChains/Cuda.cpp b/clang/lib/Driver/ToolChains/Cuda.cpp
@@ -990,7 +990,10 @@ CudaToolChain::TranslateArgs(const llvm::opt::DerivedArgList &Args,
   }
 
   for (Arg *A : Args) {
-    DAL->append(A);
+    // Make sure flags are not duplicated.
+    if (!llvm::is_contained(*DAL, A)) {
+      DAL->append(A);
+    }
   }
 
   if (!BoundArch.empty()) {

diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -35,27 +35,18 @@ static void addDashXForInput(const ArgList &Args, const InputInfo &Input,
 
 void Flang::addFortranDialectOptions(const ArgList &Args,
                                      ArgStringList &CmdArgs) const {
-  Args.addAllArgs(CmdArgs, {options::OPT_ffixed_form,
-                            options::OPT_ffree_form,
-                            options::OPT_ffixed_line_length_EQ,
-                            options::OPT_fopenmp,
-                            options::OPT_fopenmp_version_EQ,
-                            options::OPT_fopenacc,
-                            options::OPT_finput_charset_EQ,
-                            options::OPT_fimplicit_none,
-                            options::OPT_fno_implicit_none,
-                            options::OPT_fbackslash,
-                            options::OPT_fno_backslash,
-                            options::OPT_flogical_abbreviations,
-                            options::OPT_fno_logical_abbreviations,
-                            options::OPT_fxor_operator,
-                            options::OPT_fno_xor_operator,
-                            options::OPT_falternative_parameter_statement,
-                            options::OPT_fdefault_real_8,
-                            options::OPT_fdefault_integer_8,
-                            options::OPT_fdefault_double_8,
-                            options::OPT_flarge_sizes,
-                            options::OPT_fno_automatic});
+  Args.addAllArgs(
+      CmdArgs, {options::OPT_ffixed_form, options::OPT_ffree_form,
+                options::OPT_ffixed_line_length_EQ, options::OPT_fopenacc,
+                options::OPT_finput_charset_EQ, options::OPT_fimplicit_none,
+                options::OPT_fno_implicit_none, options::OPT_fbackslash,
+                options::OPT_fno_backslash, options::OPT_flogical_abbreviations,
+                options::OPT_fno_logical_abbreviations,
+                options::OPT_fxor_operator, options::OPT_fno_xor_operator,
+                options::OPT_falternative_parameter_statement,
+                options::OPT_fdefault_real_8, options::OPT_fdefault_integer_8,
+                options::OPT_fdefault_double_8, options::OPT_flarge_sizes,
+                options::OPT_fno_automatic});
 }
 
 void Flang::addPreprocessingOptions(const ArgList &Args,
@@ -763,6 +754,35 @@ void Flang::ConstructJob(Compilation &C, const JobAction &JA,
   // Add other compile options
   addOtherOptions(Args, CmdArgs);
 
+  // Forward flags for OpenMP. We don't do this if the current action is an
+  // device offloading action other than OpenMP.
+  if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
+                   options::OPT_fno_openmp, false) &&
+      (JA.isDeviceOffloading(Action::OFK_None) ||
+       JA.isDeviceOffloading(Action::OFK_OpenMP))) {
+    switch (D.getOpenMPRuntime(Args)) {
+    case Driver::OMPRT_OMP:
+    case Driver::OMPRT_IOMP5:
+      // Clang can generate useful OpenMP code for these two runtime libraries.
+      CmdArgs.push_back("-fopenmp");
+      Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_version_EQ);
+
+      // FIXME: Clang supports a whole bunch more flags here.
+      break;
+    default:
+      // By default, if Clang doesn't know how to generate useful OpenMP code
+      // for a specific runtime library, we just don't pass the '-fopenmp' flag
+      // down to the actual compilation.
+      // FIXME: It would be better to have a mode which *only* omits IR
+      // generation based on the OpenMP support so that we get consistent
+      // semantic analysis, etc.
+      const Arg *A = Args.getLastArg(options::OPT_fopenmp_EQ);
+      D.Diag(diag::warn_drv_unsupported_openmp_library)
+          << A->getSpelling() << A->getValue();
+      break;
+    }
+  }
+
   // Offloading related options
   addOffloadOptions(C, Inputs, JA, Args, CmdArgs);
 

diff --git a/clang/lib/Format/FormatTokenLexer.cpp b/clang/lib/Format/FormatTokenLexer.cpp
@@ -404,7 +404,7 @@ bool FormatTokenLexer::tryMergeNullishCoalescingEqual() {
     return false;
   auto &NullishCoalescing = *(Tokens.end() - 2);
   auto &Equal = *(Tokens.end() - 1);
-  if (NullishCoalescing->getType() != TT_NullCoalescingOperator ||
+  if (NullishCoalescing->isNot(TT_NullCoalescingOperator) ||
       Equal->isNot(tok::equal)) {
     return false;
   }

diff --git a/clang/lib/Format/FormatTokenSource.h b/clang/lib/Format/FormatTokenSource.h
@@ -72,6 +72,15 @@ class FormatTokenSource {
   // getNextToken() -> a1
   // getNextToken() -> a2
   virtual FormatToken *insertTokens(ArrayRef<FormatToken *> Tokens) = 0;
+
+  [[nodiscard]] FormatToken *getNextNonComment() {
+    FormatToken *Tok;
+    do {
+      Tok = getNextToken();
+      assert(Tok);
+    } while (Tok->is(tok::comment));
+    return Tok;
+  }
 };
 
 class IndexedTokenSource : public FormatTokenSource {

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
@@ -825,8 +825,7 @@ class AnnotatingParser {
             Parent->overwriteFixedType(TT_BinaryOperator);
         }
         // An arrow after an ObjC method expression is not a lambda arrow.
-        if (CurrentToken->getType() == TT_ObjCMethodExpr &&
-            CurrentToken->Next &&
+        if (CurrentToken->is(TT_ObjCMethodExpr) && CurrentToken->Next &&
             CurrentToken->Next->is(TT_TrailingReturnArrow)) {
           CurrentToken->Next->overwriteFixedType(TT_Unknown);
         }
@@ -1563,7 +1562,7 @@ class AnnotatingParser {
     case tok::l_brace:
       if (Style.Language == FormatStyle::LK_TextProto) {
         FormatToken *Previous = Tok->getPreviousNonComment();
-        if (Previous && Previous->getType() != TT_DictLiteral)
+        if (Previous && Previous->isNot(TT_DictLiteral))
           Previous->setType(TT_SelectorName);
       }
       Scopes.push_back(getScopeType(*Tok));
@@ -1583,7 +1582,7 @@ class AnnotatingParser {
              Tok->Previous->isOneOf(TT_SelectorName, TT_DictLiteral))) {
           Tok->setType(TT_DictLiteral);
           FormatToken *Previous = Tok->getPreviousNonComment();
-          if (Previous && Previous->getType() != TT_DictLiteral)
+          if (Previous && Previous->isNot(TT_DictLiteral))
             Previous->setType(TT_SelectorName);
         }
         if (Style.isTableGen())
@@ -4754,8 +4753,7 @@ bool TokenAnnotator::spaceRequiredBetween(const AnnotatedLine &Line,
     // Objective-C dictionary literal -> no space before closing brace.
     return false;
   }
-  if (Right.getType() == TT_TrailingAnnotation &&
-      Right.isOneOf(tok::amp, tok::ampamp) &&
+  if (Right.is(TT_TrailingAnnotation) && Right.isOneOf(tok::amp, tok::ampamp) &&
       Left.isOneOf(tok::kw_const, tok::kw_volatile) &&
       (!Right.Next || Right.Next->is(tok::semi))) {
     // Match const and volatile ref-qualifiers without any additional

diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -365,11 +365,11 @@ bool UnwrappedLineParser::parseLevel(const FormatToken *OpeningBrace,
       nextToken();
       continue;
     }
-    tok::TokenKind kind = FormatTok->Tok.getKind();
-    if (FormatTok->getType() == TT_MacroBlockBegin)
-      kind = tok::l_brace;
-    else if (FormatTok->getType() == TT_MacroBlockEnd)
-      kind = tok::r_brace;
+    tok::TokenKind Kind = FormatTok->Tok.getKind();
+    if (FormatTok->is(TT_MacroBlockBegin))
+      Kind = tok::l_brace;
+    else if (FormatTok->is(TT_MacroBlockEnd))
+      Kind = tok::r_brace;
 
     auto ParseDefault = [this, OpeningBrace, IfKind, &IfLBrace, &HasDoWhile,
                          &HasLabel, &StatementCount] {
@@ -380,7 +380,7 @@ bool UnwrappedLineParser::parseLevel(const FormatToken *OpeningBrace,
       assert(StatementCount > 0 && "StatementCount overflow!");
     };
 
-    switch (kind) {
+    switch (Kind) {
     case tok::comment:
       nextToken();
       addUnwrappedLine();
@@ -427,11 +427,7 @@ bool UnwrappedLineParser::parseLevel(const FormatToken *OpeningBrace,
       break;
     case tok::kw_default: {
       unsigned StoredPosition = Tokens->getPosition();
-      FormatToken *Next;
-      do {
-        Next = Tokens->getNextToken();
-        assert(Next);
-      } while (Next->is(tok::comment));
+      auto *Next = Tokens->getNextNonComment();
       FormatTok = Tokens->setPosition(StoredPosition);
       if (Next->isNot(tok::colon)) {
         // default not followed by ':' is not a case label; treat it like
@@ -495,20 +491,19 @@ void UnwrappedLineParser::calculateBraceTypes(bool ExpectClassBody) {
   };
   SmallVector<StackEntry, 8> LBraceStack;
   assert(Tok->is(tok::l_brace));
+
   do {
-    // Get next non-comment, non-preprocessor token.
-    FormatToken *NextTok;
-    do {
-      NextTok = Tokens->getNextToken();
-    } while (NextTok->is(tok::comment));
-    if (!Style.isTableGen()) {
-      // InTableGen, '#' is like binary operator. Not a preprocessor directive.
-      while (NextTok->is(tok::hash) && !Line->InMacroBody) {
-        NextTok = Tokens->getNextToken();
+    auto *NextTok = Tokens->getNextNonComment();
+
+    if (!Line->InMacroBody && !Style.isTableGen()) {
+      // Skip PPDirective lines and comments.
+      while (NextTok->is(tok::hash)) {
         do {
           NextTok = Tokens->getNextToken();
-        } while (NextTok->is(tok::comment) ||
-                 (NextTok->NewlinesBefore == 0 && NextTok->isNot(tok::eof)));
+        } while (NextTok->NewlinesBefore == 0 && NextTok->isNot(tok::eof));
+
+        while (NextTok->is(tok::comment))
+          NextTok = Tokens->getNextToken();
       }
     }
 
@@ -640,6 +635,7 @@ void UnwrappedLineParser::calculateBraceTypes(bool ExpectClassBody) {
     default:
       break;
     }
+
     PrevTok = Tok;
     Tok = NextTok;
   } while (Tok->isNot(tok::eof) && !LBraceStack.empty());
@@ -3277,8 +3273,8 @@ void UnwrappedLineParser::parseSwitch() {
 }
 
 // Operators that can follow a C variable.
-static bool isCOperatorFollowingVar(tok::TokenKind kind) {
-  switch (kind) {
+static bool isCOperatorFollowingVar(tok::TokenKind Kind) {
+  switch (Kind) {
   case tok::ampamp:
   case tok::ampequal:
   case tok::arrow:
@@ -4706,14 +4702,13 @@ void UnwrappedLineParser::readToken(int LevelDifference) {
   do {
     FormatTok = Tokens->getNextToken();
     assert(FormatTok);
-    while (FormatTok->getType() == TT_ConflictStart ||
-           FormatTok->getType() == TT_ConflictEnd ||
-           FormatTok->getType() == TT_ConflictAlternative) {
-      if (FormatTok->getType() == TT_ConflictStart)
+    while (FormatTok->isOneOf(TT_ConflictStart, TT_ConflictEnd,
+                              TT_ConflictAlternative)) {
+      if (FormatTok->is(TT_ConflictStart))
         conditionalCompilationStart(/*Unreachable=*/false);
-      else if (FormatTok->getType() == TT_ConflictAlternative)
+      else if (FormatTok->is(TT_ConflictAlternative))
         conditionalCompilationAlternative();
-      else if (FormatTok->getType() == TT_ConflictEnd)
+      else if (FormatTok->is(TT_ConflictEnd))
         conditionalCompilationEnd();
       FormatTok = Tokens->getNextToken();
       FormatTok->MustBreakBefore = true;

diff --git a/clang/lib/Format/WhitespaceManager.cpp b/clang/lib/Format/WhitespaceManager.cpp
@@ -473,8 +473,7 @@ AlignTokenSequence(const FormatStyle &Style, unsigned Start, unsigned End,
           Style.ReferenceAlignment != FormatStyle::RAS_Right &&
           Style.ReferenceAlignment != FormatStyle::RAS_Pointer;
       for (int Previous = i - 1;
-           Previous >= 0 &&
-           Changes[Previous].Tok->getType() == TT_PointerOrReference;
+           Previous >= 0 && Changes[Previous].Tok->is(TT_PointerOrReference);
            --Previous) {
         assert(Changes[Previous].Tok->isPointerOrReference());
         if (Changes[Previous].Tok->isNot(tok::star)) {

diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -533,10 +533,10 @@ static T extractMaskValue(T KeyPath) {
 
 #define PARSE_OPTION_WITH_MARSHALLING(                                         \
     ARGS, DIAGS, PREFIX_TYPE, SPELLING, ID, KIND, GROUP, ALIAS, ALIASARGS,     \
-    FLAGS, VISIBILITY, PARAM, HELPTEXT, METAVAR, VALUES, SHOULD_PARSE,         \
-    ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE,         \
-    NORMALIZER, DENORMALIZER, MERGER, EXTRACTOR, TABLE_INDEX)                  \
-  if ((VISIBILITY)&options::CC1Option) {                                       \
+    FLAGS, VISIBILITY, PARAM, HELPTEXT, HELPTEXTSFORVARIANTS, METAVAR, VALUES, \
+    SHOULD_PARSE, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE, IMPLIED_CHECK,          \
+    IMPLIED_VALUE, NORMALIZER, DENORMALIZER, MERGER, EXTRACTOR, TABLE_INDEX)   \
+  if ((VISIBILITY) & options::CC1Option) {                                     \
     KEYPATH = MERGER(KEYPATH, DEFAULT_VALUE);                                  \
     if (IMPLIED_CHECK)                                                         \
       KEYPATH = MERGER(KEYPATH, IMPLIED_VALUE);                                \
@@ -550,10 +550,10 @@ static T extractMaskValue(T KeyPath) {
 // with lifetime extension of the reference.
 #define GENERATE_OPTION_WITH_MARSHALLING(                                      \
     CONSUMER, PREFIX_TYPE, SPELLING, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, \
-    VISIBILITY, PARAM, HELPTEXT, METAVAR, VALUES, SHOULD_PARSE, ALWAYS_EMIT,   \
-    KEYPATH, DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER,          \
-    DENORMALIZER, MERGER, EXTRACTOR, TABLE_INDEX)                              \
-  if ((VISIBILITY)&options::CC1Option) {                                       \
+    VISIBILITY, PARAM, HELPTEXT, HELPTEXTSFORVARIANTS, METAVAR, VALUES,        \
+    SHOULD_PARSE, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE, IMPLIED_CHECK,          \
+    IMPLIED_VALUE, NORMALIZER, DENORMALIZER, MERGER, EXTRACTOR, TABLE_INDEX)   \
+  if ((VISIBILITY) & options::CC1Option) {                                     \
     [&](const auto &Extracted) {                                               \
       if (ALWAYS_EMIT ||                                                       \
           (Extracted !=                                                        \

diff --git a/clang/lib/Frontend/FrontendActions.cpp b/clang/lib/Frontend/FrontendActions.cpp
@@ -69,10 +69,7 @@ void InitOnlyAction::ExecuteAction() {
 
 // Basically PreprocessOnlyAction::ExecuteAction.
 void ReadPCHAndPreprocessAction::ExecuteAction() {
-  CompilerInstance &CI = getCompilerInstance();
-  AdjustCI(CI);
-
-  Preprocessor &PP = CI.getPreprocessor();
+  Preprocessor &PP = getCompilerInstance().getPreprocessor();
 
   // Ignore unknown pragmas.
   PP.IgnorePragmas();
@@ -453,6 +450,8 @@ class DefaultTemplateInstCallback : public TemplateInstantiationCallback {
       return "BuildingBuiltinDumpStructCall";
     case CodeSynthesisContext::BuildingDeductionGuides:
       return "BuildingDeductionGuides";
+    case CodeSynthesisContext::TypeAliasTemplateInstantiation:
+      return "TypeAliasTemplateInstantiation";
     }
     return "";
   }
@@ -1191,8 +1190,6 @@ void PrintDependencyDirectivesSourceMinimizerAction::ExecuteAction() {
 
 void GetDependenciesByModuleNameAction::ExecuteAction() {
   CompilerInstance &CI = getCompilerInstance();
-  AdjustCI(CI);
-
   Preprocessor &PP = CI.getPreprocessor();
   SourceManager &SM = PP.getSourceManager();
   FileID MainFileID = SM.getMainFileID();

diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -720,10 +720,7 @@ static void InitializeCPlusPlusFeatureTestMacros(const LangOptions &LangOpts,
   if (LangOpts.CPlusPlus20) {
     Builder.defineMacro("__cpp_aggregate_paren_init", "201902L");
 
-    // P0848 is implemented, but we're still waiting for other concepts
-    // issues to be addressed before bumping __cpp_concepts up to 202002L.
-    // Refer to the discussion of this at https://reviews.llvm.org/D128619.
-    Builder.defineMacro("__cpp_concepts", "201907L");
+    Builder.defineMacro("__cpp_concepts", "202002");
     Builder.defineMacro("__cpp_conditional_explicit", "201806L");
     Builder.defineMacro("__cpp_consteval", "202211L");
     Builder.defineMacro("__cpp_constexpr_dynamic_alloc", "201907L");

diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -100,6 +100,118 @@ double3 abs(double3);
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_abs)
 double4 abs(double4);
 
+//===----------------------------------------------------------------------===//
+// all builtins
+//===----------------------------------------------------------------------===//
+
+/// \fn bool all(T x)
+/// \brief Returns True if all components of the \a x parameter are non-zero;
+/// otherwise, false. \param x The input value.
+
+#ifdef __HLSL_ENABLE_16_BIT
+_HLSL_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(int16_t);
+_HLSL_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(int16_t2);
+_HLSL_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(int16_t3);
+_HLSL_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(int16_t4);
+_HLSL_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(uint16_t);
+_HLSL_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(uint16_t2);
+_HLSL_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(uint16_t3);
+_HLSL_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(uint16_t4);
+#endif
+
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(half);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(half2);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(half3);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(half4);
+
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(bool);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(bool2);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(bool3);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(bool4);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(int);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(int2);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(int3);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(int4);
+
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(uint);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(uint2);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(uint3);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(uint4);
+
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(float);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(float2);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(float3);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(float4);
+
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(int64_t);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(int64_t2);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(int64_t3);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(int64_t4);
+
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(uint64_t);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(uint64_t2);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(uint64_t3);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(uint64_t4);
+
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(double);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(double2);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(double3);
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_all)
+bool all(double4);
+
 //===----------------------------------------------------------------------===//
 // any builtins
 //===----------------------------------------------------------------------===//

diff --git a/clang/lib/Headers/intrin.h b/clang/lib/Headers/intrin.h
@@ -18,7 +18,7 @@
 #include <intrin0.h>
 
 /* First include the standard intrinsics. */
-#if defined(__i386__) || defined(__x86_64__)
+#if defined(__i386__) || (defined(__x86_64__) && !defined(__arm64ec__))
 #include <x86intrin.h>
 #endif
 
@@ -166,7 +166,7 @@ unsigned __int32 xbegin(void);
 void _xend(void);
 
 /* These additional intrinsics are turned on in x64/amd64/x86_64 mode. */
-#ifdef __x86_64__
+#if defined(__x86_64__) && !defined(__arm64ec__)
 void __addgsbyte(unsigned long, unsigned char);
 void __addgsdword(unsigned long, unsigned long);
 void __addgsqword(unsigned long, unsigned __int64);
@@ -236,7 +236,8 @@ __int64 _mul128(__int64, __int64, __int64 *);
 /*----------------------------------------------------------------------------*\
 |* movs, stos
 \*----------------------------------------------------------------------------*/
-#if defined(__i386__) || defined(__x86_64__)
+
+#if defined(__i386__) || (defined(__x86_64__) && !defined(__arm64ec__))
 static __inline__ void __DEFAULT_FN_ATTRS __movsb(unsigned char *__dst,
                                                   unsigned char const *__src,
                                                   size_t __n) {
@@ -305,7 +306,7 @@ static __inline__ void __DEFAULT_FN_ATTRS __stosw(unsigned short *__dst,
                        : "memory");
 }
 #endif
-#ifdef __x86_64__
+#if defined(__x86_64__) && !defined(__arm64ec__)
 static __inline__ void __DEFAULT_FN_ATTRS __movsq(
     unsigned long long *__dst, unsigned long long const *__src, size_t __n) {
   __asm__ __volatile__("rep movsq"
@@ -324,7 +325,7 @@ static __inline__ void __DEFAULT_FN_ATTRS __stosq(unsigned __int64 *__dst,
 /*----------------------------------------------------------------------------*\
 |* Misc
 \*----------------------------------------------------------------------------*/
-#if defined(__i386__) || defined(__x86_64__)
+#if defined(__i386__) || (defined(__x86_64__) && !defined(__arm64ec__))
 static __inline__ void __DEFAULT_FN_ATTRS __halt(void) {
   __asm__ volatile("hlt");
 }
@@ -339,7 +340,7 @@ static __inline__ void __DEFAULT_FN_ATTRS __nop(void) {
 /*----------------------------------------------------------------------------*\
 |* MS AArch64 specific
 \*----------------------------------------------------------------------------*/
-#if defined(__aarch64__)
+#if defined(__aarch64__) || defined(__arm64ec__)
 unsigned __int64 __getReg(int);
 long _InterlockedAdd(long volatile *Addend, long Value);
 __int64 _InterlockedAdd64(__int64 volatile *Addend, __int64 Value);
@@ -383,7 +384,7 @@ void __cdecl __prefetch(void *);
 /*----------------------------------------------------------------------------*\
 |* Privileged intrinsics
 \*----------------------------------------------------------------------------*/
-#if defined(__i386__) || defined(__x86_64__)
+#if defined(__i386__) || (defined(__x86_64__) && !defined(__arm64ec__))
 static __inline__ unsigned __int64 __DEFAULT_FN_ATTRS
 __readmsr(unsigned long __register) {
   // Loads the contents of a 64-bit model specific register (MSR) specified in
@@ -397,7 +398,6 @@ __readmsr(unsigned long __register) {
   __asm__ ("rdmsr" : "=d"(__edx), "=a"(__eax) : "c"(__register));
   return (((unsigned __int64)__edx) << 32) | (unsigned __int64)__eax;
 }
-#endif
 
 static __inline__ unsigned __LPTRINT_TYPE__ __DEFAULT_FN_ATTRS __readcr3(void) {
   unsigned __LPTRINT_TYPE__ __cr3_val;
@@ -413,6 +413,7 @@ static __inline__ void __DEFAULT_FN_ATTRS
 __writecr3(unsigned __INTPTR_TYPE__ __cr3_val) {
   __asm__ ("mov {%0, %%cr3|cr3, %0}" : : "r"(__cr3_val) : "memory");
 }
+#endif
 
 #ifdef __cplusplus
 }

diff --git a/clang/lib/Headers/intrin0.h b/clang/lib/Headers/intrin0.h
@@ -15,7 +15,7 @@
 #ifndef __INTRIN0_H
 #define __INTRIN0_H
 
-#ifdef __x86_64__
+#if defined(__x86_64__) && !defined(__arm64ec__)
 #include <adcintrin.h>
 #endif
 
@@ -27,7 +27,7 @@ unsigned char _BitScanForward(unsigned long *_Index, unsigned long _Mask);
 unsigned char _BitScanReverse(unsigned long *_Index, unsigned long _Mask);
 void _ReadWriteBarrier(void);
 
-#if defined(__aarch64__)
+#if defined(__aarch64__) || defined(__arm64ec__)
 unsigned int _CountLeadingZeros(unsigned long);
 unsigned int _CountLeadingZeros64(unsigned _int64);
 unsigned char _InterlockedCompareExchange128_acq(__int64 volatile *_Destination,
@@ -44,7 +44,7 @@ unsigned char _InterlockedCompareExchange128_rel(__int64 volatile *_Destination,
                                                  __int64 *_ComparandResult);
 #endif
 
-#ifdef __x86_64__
+#ifdef __x86_64__ && !defined(__arm64ec__)
 unsigned __int64 _umul128(unsigned __int64, unsigned __int64,
                           unsigned __int64 *);
 unsigned __int64 __shiftleft128(unsigned __int64 _LowPart,
@@ -55,7 +55,7 @@ unsigned __int64 __shiftright128(unsigned __int64 _LowPart,
                                  unsigned char _Shift);
 #endif
 
-#if defined(__x86_64__) || defined(__i386__)
+#if defined(__i386__) || (defined(__x86_64__) && !defined(__arm64ec__))
 void _mm_pause(void);
 #endif
 
@@ -83,7 +83,7 @@ __int64 _InterlockedXor64(__int64 volatile *_Value, __int64 _Mask);
 __int64 _InterlockedAnd64(__int64 volatile *_Value, __int64 _Mask);
 #endif
 
-#if defined(__arm__) || defined(__aarch64__)
+#if defined(__arm__) || defined(__aarch64__) || defined(__arm64ec__)
 /*----------------------------------------------------------------------------*\
 |* Interlocked Exchange Add
 \*----------------------------------------------------------------------------*/

diff --git a/clang/lib/InstallAPI/CMakeLists.txt b/clang/lib/InstallAPI/CMakeLists.txt
@@ -7,6 +7,7 @@ set(LLVM_LINK_COMPONENTS
   )
 
 add_clang_library(clangInstallAPI
+  DiagnosticBuilderWrappers.cpp
   DylibVerifier.cpp
   FileList.cpp
   Frontend.cpp

diff --git a/clang/lib/InstallAPI/DiagnosticBuilderWrappers.cpp b/clang/lib/InstallAPI/DiagnosticBuilderWrappers.cpp
@@ -0,0 +1,110 @@
+//===- DiagnosticBuilderWrappers.cpp ----------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "DiagnosticBuilderWrappers.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/TextAPI/Platform.h"
+
+using clang::DiagnosticBuilder;
+
+namespace llvm {
+namespace MachO {
+const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
+                                    const Architecture &Arch) {
+  DB.AddString(getArchitectureName(Arch));
+  return DB;
+}
+
+const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
+                                    const ArchitectureSet &ArchSet) {
+  DB.AddString(std::string(ArchSet));
+  return DB;
+}
+
+const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
+                                    const PlatformType &Platform) {
+  DB.AddString(getPlatformName(Platform));
+  return DB;
+}
+
+const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
+                                    const PlatformVersionSet &Platforms) {
+  std::string PlatformAsString;
+  raw_string_ostream Stream(PlatformAsString);
+
+  Stream << "[ ";
+  llvm::interleaveComma(
+      Platforms, Stream,
+      [&Stream](const std::pair<PlatformType, VersionTuple> &PV) {
+        Stream << getPlatformName(PV.first);
+        if (!PV.second.empty())
+          Stream << PV.second.getAsString();
+      });
+  Stream << " ]";
+  DB.AddString(Stream.str());
+  return DB;
+}
+
+const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
+                                    const FileType &Type) {
+  switch (Type) {
+  case FileType::MachO_Bundle:
+    DB.AddString("mach-o bundle");
+    return DB;
+  case FileType::MachO_DynamicLibrary:
+    DB.AddString("mach-o dynamic library");
+    return DB;
+  case FileType::MachO_DynamicLibrary_Stub:
+    DB.AddString("mach-o dynamic library stub");
+    return DB;
+  case FileType::TBD_V1:
+    DB.AddString("tbd-v1");
+    return DB;
+  case FileType::TBD_V2:
+    DB.AddString("tbd-v2");
+    return DB;
+  case FileType::TBD_V3:
+    DB.AddString("tbd-v3");
+    return DB;
+  case FileType::TBD_V4:
+    DB.AddString("tbd-v4");
+    return DB;
+  case FileType::TBD_V5:
+    DB.AddString("tbd-v5");
+    return DB;
+  case FileType::Invalid:
+  case FileType::All:
+    break;
+  }
+  llvm_unreachable("Unexpected file type for diagnostics.");
+}
+
+const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
+                                    const PackedVersion &Version) {
+  std::string VersionString;
+  raw_string_ostream OS(VersionString);
+  OS << Version;
+  DB.AddString(OS.str());
+  return DB;
+}
+
+const clang::DiagnosticBuilder &
+operator<<(const clang::DiagnosticBuilder &DB,
+           const StringMapEntry<ArchitectureSet> &LibAttr) {
+  std::string IFAsString;
+  raw_string_ostream OS(IFAsString);
+
+  OS << LibAttr.getKey() << " [ " << LibAttr.getValue() << " ]";
+  DB.AddString(OS.str());
+  return DB;
+}
+
+} // namespace MachO
+} // namespace llvm
diff --git a/clang/lib/InstallAPI/DiagnosticBuilderWrappers.h b/clang/lib/InstallAPI/DiagnosticBuilderWrappers.h
@@ -0,0 +1,49 @@
+//===- DiagnosticBuilderWrappers.h -----------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+/// Diagnostic wrappers for TextAPI types for error reporting.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_INSTALLAPI_DIAGNOSTICBUILDER_WRAPPER_H
+#define LLVM_CLANG_INSTALLAPI_DIAGNOSTICBUILDER_WRAPPER_H
+
+#include "clang/Basic/Diagnostic.h"
+#include "llvm/TextAPI/Architecture.h"
+#include "llvm/TextAPI/ArchitectureSet.h"
+#include "llvm/TextAPI/InterfaceFile.h"
+#include "llvm/TextAPI/Platform.h"
+
+namespace llvm {
+namespace MachO {
+
+const clang::DiagnosticBuilder &operator<<(const clang::DiagnosticBuilder &DB,
+                                           const PlatformType &Platform);
+
+const clang::DiagnosticBuilder &operator<<(const clang::DiagnosticBuilder &DB,
+                                           const PlatformVersionSet &Platforms);
+
+const clang::DiagnosticBuilder &operator<<(const clang::DiagnosticBuilder &DB,
+                                           const Architecture &Arch);
+
+const clang::DiagnosticBuilder &operator<<(const clang::DiagnosticBuilder &DB,
+                                           const ArchitectureSet &ArchSet);
+
+const clang::DiagnosticBuilder &operator<<(const clang::DiagnosticBuilder &DB,
+                                           const FileType &Type);
+
+const clang::DiagnosticBuilder &operator<<(const clang::DiagnosticBuilder &DB,
+                                           const PackedVersion &Version);
+
+const clang::DiagnosticBuilder &
+operator<<(const clang::DiagnosticBuilder &DB,
+           const StringMapEntry<ArchitectureSet> &LibAttr);
+
+} // namespace MachO
+} // namespace llvm
+#endif // LLVM_CLANG_INSTALLAPI_DIAGNOSTICBUILDER_WRAPPER_H