diff --git a/clang/lib/Driver/ToolChains/Arch/RISCV.cpp b/clang/lib/Driver/ToolChains/Arch/RISCV.cpp
@@ -67,11 +67,6 @@ static void getRISCFeaturesFromMcpu(const Driver &D, const Arg *A,
       D.Diag(clang::diag::err_drv_unsupported_option_argument)
           << A->getSpelling() << Mcpu;
   }
-
-  if (llvm::RISCV::hasFastUnalignedAccess(Mcpu)) {
-    Features.push_back("+unaligned-scalar-mem");
-    Features.push_back("+unaligned-vector-mem");
-  }
 }
 
 void riscv::getRISCVTargetFeatures(const Driver &D, const llvm::Triple &Triple,
@@ -82,6 +77,8 @@ void riscv::getRISCVTargetFeatures(const Driver &D, const llvm::Triple &Triple,
   if (!getArchFeatures(D, MArch, Features, Args))
     return;
 
+  bool CPUFastUnaligned = false;
+
   // If users give march and mcpu, get std extension feature from MArch
   // and other features (ex. mirco architecture feature) from mcpu
   if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
@@ -90,6 +87,9 @@ void riscv::getRISCVTargetFeatures(const Driver &D, const llvm::Triple &Triple,
       CPU = llvm::sys::getHostCPUName();
 
     getRISCFeaturesFromMcpu(D, A, Triple, CPU, Features);
+
+    if (llvm::RISCV::hasFastUnalignedAccess(CPU))
+      CPUFastUnaligned = true;
   }
 
   // Handle features corresponding to "-ffixed-X" options
@@ -169,18 +169,23 @@ void riscv::getRISCVTargetFeatures(const Driver &D, const llvm::Triple &Triple,
     Features.push_back("-relax");
   }
 
-  // Android requires fast unaligned access on RISCV64.
-  if (Triple.isAndroid()) {
+  // If -mstrict-align or -mno-strict-align is passed, use it. Otherwise, the
+  // unaligned-*-mem is enabled if the CPU supports it or the target is
+  // Android.
+  if (const Arg *A = Args.getLastArg(options::OPT_mno_strict_align,
+                                     options::OPT_mstrict_align)) {
+    if (A->getOption().matches(options::OPT_mno_strict_align)) {
+      Features.push_back("+unaligned-scalar-mem");
+      Features.push_back("+unaligned-vector-mem");
+    } else {
+      Features.push_back("-unaligned-scalar-mem");
+      Features.push_back("-unaligned-vector-mem");
+    }
+  } else if (CPUFastUnaligned || Triple.isAndroid()) {
     Features.push_back("+unaligned-scalar-mem");
     Features.push_back("+unaligned-vector-mem");
   }
 
-  // -mstrict-align is default, unless -mno-strict-align is specified.
-  AddTargetFeature(Args, Features, options::OPT_mno_strict_align,
-                   options::OPT_mstrict_align, "unaligned-scalar-mem");
-  AddTargetFeature(Args, Features, options::OPT_mno_strict_align,
-                   options::OPT_mstrict_align, "unaligned-vector-mem");
-
   // Now add any that the user explicitly requested on the command line,
   // which may override the defaults.
   handleTargetFeaturesGroup(D, Triple, Args, Features,

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -5678,6 +5678,9 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   case CodeGenOptions::FramePointerKind::None:
     FPKeepKindStr = "-mframe-pointer=none";
     break;
+  case CodeGenOptions::FramePointerKind::Reserved:
+    FPKeepKindStr = "-mframe-pointer=reserved";
+    break;
   case CodeGenOptions::FramePointerKind::NonLeaf:
     FPKeepKindStr = "-mframe-pointer=non-leaf";
     break;

diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -164,6 +164,14 @@ static bool useFramePointerForTargetByDefault(const llvm::opt::ArgList &Args,
   return true;
 }
 
+static bool useLeafFramePointerForTargetByDefault(const llvm::Triple &Triple) {
+  if (Triple.isAArch64() || Triple.isPS() || Triple.isVE() ||
+      (Triple.isAndroid() && Triple.isRISCV64()))
+    return false;
+
+  return true;
+}
+
 static bool mustUseNonLeafFramePointerForTarget(const llvm::Triple &Triple) {
   switch (Triple.getArch()) {
   default:
@@ -176,38 +184,91 @@ static bool mustUseNonLeafFramePointerForTarget(const llvm::Triple &Triple) {
   }
 }
 
+// True if a target-specific option requires the frame chain to be preserved,
+// even if new frame records are not created.
+static bool mustMaintainValidFrameChain(const llvm::opt::ArgList &Args,
+                                        const llvm::Triple &Triple) {
+  if (Triple.isARM() || Triple.isThumb()) {
+    // For 32-bit Arm, the -mframe-chain=aapcs and -mframe-chain=aapcs+leaf
+    // options require the frame pointer register to be reserved (or point to a
+    // new AAPCS-compilant frame record), even with	-fno-omit-frame-pointer.
+    if (Arg *A = Args.getLastArg(options::OPT_mframe_chain)) {
+      StringRef V = A->getValue();
+      return V != "none";
+    }
+    return false;
+  }
+  return false;
+}
+
+// True if a target-specific option causes -fno-omit-frame-pointer to also
+// cause frame records to be created in leaf functions.
+static bool framePointerImpliesLeafFramePointer(const llvm::opt::ArgList &Args,
+                                                const llvm::Triple &Triple) {
+  if (Triple.isARM() || Triple.isThumb()) {
+    // For 32-bit Arm, the -mframe-chain=aapcs+leaf option causes the
+    // -fno-omit-frame-pointer optiion to imply -mno-omit-leaf-frame-pointer,
+    // but does not by itself imply either option.
+    if (Arg *A = Args.getLastArg(options::OPT_mframe_chain)) {
+      StringRef V = A->getValue();
+      return V == "aapcs+leaf";
+    }
+    return false;
+  }
+  return false;
+}
+
 clang::CodeGenOptions::FramePointerKind
 getFramePointerKind(const llvm::opt::ArgList &Args,
                     const llvm::Triple &Triple) {
-  // We have 4 states:
+  // There are three things to consider here:
+  // * Should a frame record be created for non-leaf functions?
+  // * Should a frame record be created for leaf functions?
+  // * Is the frame pointer register reserved, i.e. must it always point to
+  //   either a new, valid frame record or be un-modified?
   //
-  //  00) leaf retained, non-leaf retained
-  //  01) leaf retained, non-leaf omitted (this is invalid)
-  //  10) leaf omitted, non-leaf retained
-  //      (what -momit-leaf-frame-pointer was designed for)
-  //  11) leaf omitted, non-leaf omitted
+  //  Not all combinations of these are valid:
+  //  * It's not useful to have leaf frame records without non-leaf ones.
+  //  * It's not useful to have frame records without reserving the frame
+  //    pointer.
   //
-  //  "omit" options taking precedence over "no-omit" options is the only way
-  //  to make 3 valid states representable
-  llvm::opt::Arg *A =
-      Args.getLastArg(clang::driver::options::OPT_fomit_frame_pointer,
-                      clang::driver::options::OPT_fno_omit_frame_pointer);
-
-  bool OmitFP = A && A->getOption().matches(
-                         clang::driver::options::OPT_fomit_frame_pointer);
-  bool NoOmitFP = A && A->getOption().matches(
-                           clang::driver::options::OPT_fno_omit_frame_pointer);
-  bool OmitLeafFP =
-      Args.hasFlag(clang::driver::options::OPT_momit_leaf_frame_pointer,
-                   clang::driver::options::OPT_mno_omit_leaf_frame_pointer,
-                   Triple.isAArch64() || Triple.isPS() || Triple.isVE() ||
-                       (Triple.isAndroid() && Triple.isRISCV64()));
-  if (NoOmitFP || mustUseNonLeafFramePointerForTarget(Triple) ||
-      (!OmitFP && useFramePointerForTargetByDefault(Args, Triple))) {
-    if (OmitLeafFP)
-      return clang::CodeGenOptions::FramePointerKind::NonLeaf;
-    return clang::CodeGenOptions::FramePointerKind::All;
-  }
+  // | Non-leaf | Leaf | Reserved |
+  // | N        | N    | N        | FramePointerKind::None
+  // | N        | N    | Y        | FramePointerKind::Reserved
+  // | N        | Y    | N        | Invalid
+  // | N        | Y    | Y        | Invalid
+  // | Y        | N    | N        | Invalid
+  // | Y        | N    | Y        | FramePointerKind::NonLeaf
+  // | Y        | Y    | N        | Invalid
+  // | Y        | Y    | Y        | FramePointerKind::All
+  //
+  // The FramePointerKind::Reserved case is currently only reachable for Arm,
+  // which has the -mframe-chain= option which can (in combination with
+  // -fno-omit-frame-pointer) specify that the frame chain must be valid,
+  // without requiring new frame records to be created.
+
+  bool DefaultFP = useFramePointerForTargetByDefault(Args, Triple);
+  bool EnableFP =
+      mustUseNonLeafFramePointerForTarget(Triple) ||
+      Args.hasFlag(clang::driver::options::OPT_fno_omit_frame_pointer,
+                   clang::driver::options::OPT_fomit_frame_pointer, DefaultFP);
+
+  bool DefaultLeafFP =
+      useLeafFramePointerForTargetByDefault(Triple) ||
+      (EnableFP && framePointerImpliesLeafFramePointer(Args, Triple));
+  bool EnableLeafFP = Args.hasFlag(
+      clang::driver::options::OPT_mno_omit_leaf_frame_pointer,
+      clang::driver::options::OPT_momit_leaf_frame_pointer, DefaultLeafFP);
+
+  bool FPRegReserved = EnableFP || mustMaintainValidFrameChain(Args, Triple);
+
+  if (EnableFP) {
+    if (EnableLeafFP)
+      return clang::CodeGenOptions::FramePointerKind::All;
+    return clang::CodeGenOptions::FramePointerKind::NonLeaf;
+  }
+  if (FPRegReserved)
+    return clang::CodeGenOptions::FramePointerKind::Reserved;
   return clang::CodeGenOptions::FramePointerKind::None;
 }
 

diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -802,6 +802,9 @@ void Flang::ConstructJob(Compilation &C, const JobAction &JA,
   case CodeGenOptions::FramePointerKind::None:
     FPKeepKindStr = "-mframe-pointer=none";
     break;
+   case CodeGenOptions::FramePointerKind::Reserved:
+    FPKeepKindStr = "-mframe-pointer=reserved";
+    break;
   case CodeGenOptions::FramePointerKind::NonLeaf:
     FPKeepKindStr = "-mframe-pointer=non-leaf";
     break;

diff --git a/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp b/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
@@ -31,7 +31,6 @@
 using namespace clang;
 using namespace clang::extractapi;
 using namespace llvm;
-using namespace llvm::json;
 
 namespace {
 
@@ -1036,9 +1035,9 @@ void SymbolGraphSerializer::serializeGraphToStream(
     ExtendedModule &&EM) {
   Object Root = serializeGraph(ModuleName, std::move(EM));
   if (Options.Compact)
-    OS << formatv("{0}", Value(std::move(Root))) << "\n";
+    OS << formatv("{0}", json::Value(std::move(Root))) << "\n";
   else
-    OS << formatv("{0:2}", Value(std::move(Root))) << "\n";
+    OS << formatv("{0:2}", json::Value(std::move(Root))) << "\n";
 }
 
 void SymbolGraphSerializer::serializeMainSymbolGraph(

diff --git a/clang/lib/Format/ContinuationIndenter.cpp b/clang/lib/Format/ContinuationIndenter.cpp
@@ -1712,7 +1712,7 @@ void ContinuationIndenter::moveStatePastFakeLParens(LineState &State,
         (!Previous || Previous->isNot(tok::kw_return) ||
          (Style.Language != FormatStyle::LK_Java && PrecedenceLevel > 0)) &&
         (Style.AlignAfterOpenBracket != FormatStyle::BAS_DontAlign ||
-         PrecedenceLevel != prec::Comma || Current.NestingLevel == 0) &&
+         PrecedenceLevel > prec::Comma || Current.NestingLevel == 0) &&
         (!Style.isTableGen() ||
          (Previous && Previous->isOneOf(TT_TableGenDAGArgListComma,
                                         TT_TableGenDAGArgListCommaToBreak)))) {

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
@@ -1358,6 +1358,8 @@ class AnnotatingParser {
           Line.First->startsSequence(tok::kw_export, Keywords.kw_module) ||
           Line.First->startsSequence(tok::kw_export, Keywords.kw_import)) {
         Tok->setType(TT_ModulePartitionColon);
+      } else if (Line.First->is(tok::kw_asm)) {
+        Tok->setType(TT_InlineASMColon);
       } else if (Contexts.back().ColonIsDictLiteral || Style.isProto()) {
         Tok->setType(TT_DictLiteral);
         if (Style.Language == FormatStyle::LK_TextProto) {
@@ -1425,13 +1427,6 @@ class AnnotatingParser {
         // This handles a special macro in ObjC code where selectors including
         // the colon are passed as macro arguments.
         Tok->setType(TT_ObjCMethodExpr);
-      } else if (Contexts.back().ContextKind == tok::l_paren &&
-                 !Line.InPragmaDirective) {
-        if (Style.isTableGen() && Contexts.back().IsTableGenDAGArg) {
-          Tok->setType(TT_TableGenDAGArgListColon);
-          break;
-        }
-        Tok->setType(TT_InlineASMColon);
       }
       break;
     case tok::pipe:

diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -1181,10 +1181,10 @@ void UnwrappedLineParser::parsePPDefine() {
   Line->InMacroBody = true;
 
   if (Style.SkipMacroDefinitionBody) {
-    do {
+    while (!eof()) {
       FormatTok->Finalized = true;
-      nextToken();
-    } while (!eof());
+      FormatTok = Tokens->getNextToken();
+    }
     addUnwrappedLine();
     return;
   }

diff --git a/clang/lib/Frontend/FrontendActions.cpp b/clang/lib/Frontend/FrontendActions.cpp
@@ -1169,8 +1169,8 @@ void PrintDependencyDirectivesSourceMinimizerAction::ExecuteAction() {
   llvm::SmallVector<dependency_directives_scan::Token, 16> Tokens;
   llvm::SmallVector<dependency_directives_scan::Directive, 32> Directives;
   if (scanSourceForDependencyDirectives(
-          FromFile.getBuffer(), Tokens, Directives, CI.getLangOpts(),
-          &CI.getDiagnostics(), SM.getLocForStartOfFile(SM.getMainFileID()))) {
+          FromFile.getBuffer(), Tokens, Directives, &CI.getDiagnostics(),
+          SM.getLocForStartOfFile(SM.getMainFileID()))) {
     assert(CI.getDiagnostics().hasErrorOccurred() &&
            "no errors reported for failure");
 

diff --git a/clang/lib/Interpreter/IncrementalParser.cpp b/clang/lib/Interpreter/IncrementalParser.cpp
@@ -413,7 +413,8 @@ void IncrementalParser::CleanUpPTU(PartialTranslationUnit &PTU) {
     if (!ND)
       continue;
     // Check if we need to clean up the IdResolver chain.
-    if (ND->getDeclName().getFETokenInfo())
+    if (ND->getDeclName().getFETokenInfo() && !D->getLangOpts().ObjC &&
+        !D->getLangOpts().CPlusPlus)
       getCI()->getSema().IdResolver.RemoveDecl(ND);
   }
 }

diff --git a/clang/lib/Interpreter/Interpreter.cpp b/clang/lib/Interpreter/Interpreter.cpp
@@ -42,6 +42,9 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/TargetParser/Host.h"
+
+#include <cstdarg>
+
 using namespace clang;
 
 // FIXME: Figure out how to unify with namespace init_convenience from
@@ -270,14 +273,10 @@ Interpreter::~Interpreter() {
 // can't find the precise resource directory in unittests so we have to hard
 // code them.
 const char *const Runtimes = R"(
+    #define __CLANG_REPL__ 1
 #ifdef __cplusplus
+    #define EXTERN_C extern "C"
     void *__clang_Interpreter_SetValueWithAlloc(void*, void*, void*);
-    void __clang_Interpreter_SetValueNoAlloc(void*, void*, void*);
-    void __clang_Interpreter_SetValueNoAlloc(void*, void*, void*, void*);
-    void __clang_Interpreter_SetValueNoAlloc(void*, void*, void*, float);
-    void __clang_Interpreter_SetValueNoAlloc(void*, void*, void*, double);
-    void __clang_Interpreter_SetValueNoAlloc(void*, void*, void*, long double);
-    void __clang_Interpreter_SetValueNoAlloc(void*,void*,void*,unsigned long long);
     struct __clang_Interpreter_NewTag{} __ci_newtag;
     void* operator new(__SIZE_TYPE__, void* __p, __clang_Interpreter_NewTag) noexcept;
     template <class T, class = T (*)() /*disable for arrays*/>
@@ -289,7 +288,11 @@ const char *const Runtimes = R"(
     void __clang_Interpreter_SetValueCopyArr(const T (*Src)[N], void* Placement, unsigned long Size) {
       __clang_Interpreter_SetValueCopyArr(Src[0], Placement, Size);
     }
+#else
+    #define EXTERN_C extern
 #endif // __cplusplus
+
+  EXTERN_C void __clang_Interpreter_SetValueNoAlloc(void *This, void *OutVal, void *OpaqueType, ...);
 )";
 
 llvm::Expected<std::unique_ptr<Interpreter>>
@@ -588,15 +591,17 @@ std::unique_ptr<RuntimeInterfaceBuilder> Interpreter::FindRuntimeInterface() {
   if (!LookupInterface(ValuePrintingInfo[NoAlloc],
                        MagicRuntimeInterface[NoAlloc]))
     return nullptr;
-  if (!LookupInterface(ValuePrintingInfo[WithAlloc],
-                       MagicRuntimeInterface[WithAlloc]))
-    return nullptr;
-  if (!LookupInterface(ValuePrintingInfo[CopyArray],
-                       MagicRuntimeInterface[CopyArray]))
-    return nullptr;
-  if (!LookupInterface(ValuePrintingInfo[NewTag],
-                       MagicRuntimeInterface[NewTag]))
-    return nullptr;
+  if (Ctx.getLangOpts().CPlusPlus) {
+    if (!LookupInterface(ValuePrintingInfo[WithAlloc],
+                         MagicRuntimeInterface[WithAlloc]))
+      return nullptr;
+    if (!LookupInterface(ValuePrintingInfo[CopyArray],
+                         MagicRuntimeInterface[CopyArray]))
+      return nullptr;
+    if (!LookupInterface(ValuePrintingInfo[NewTag],
+                         MagicRuntimeInterface[NewTag]))
+      return nullptr;
+  }
 
   return createInProcessRuntimeInterfaceBuilder(*this, Ctx, S);
 }
@@ -855,69 +860,81 @@ __clang_Interpreter_SetValueWithAlloc(void *This, void *OutVal,
   return VRef.getPtr();
 }
 
-// Pointers, lvalue struct that can take as a reference.
-REPL_EXTERNAL_VISIBILITY void
-__clang_Interpreter_SetValueNoAlloc(void *This, void *OutVal, void *OpaqueType,
-                                    void *Val) {
+extern "C" void REPL_EXTERNAL_VISIBILITY __clang_Interpreter_SetValueNoAlloc(
+    void *This, void *OutVal, void *OpaqueType, ...) {
   Value &VRef = *(Value *)OutVal;
-  VRef = Value(static_cast<Interpreter *>(This), OpaqueType);
-  VRef.setPtr(Val);
-}
+  Interpreter *I = static_cast<Interpreter *>(This);
+  VRef = Value(I, OpaqueType);
+  if (VRef.isVoid())
+    return;
 
-REPL_EXTERNAL_VISIBILITY void
-__clang_Interpreter_SetValueNoAlloc(void *This, void *OutVal,
-                                    void *OpaqueType) {
-  Value &VRef = *(Value *)OutVal;
-  VRef = Value(static_cast<Interpreter *>(This), OpaqueType);
-}
+  va_list args;
+  va_start(args, /*last named param*/ OpaqueType);
 
-static void SetValueDataBasedOnQualType(Value &V, unsigned long long Data) {
-  QualType QT = V.getType();
-  if (const auto *ET = QT->getAs<EnumType>())
-    QT = ET->getDecl()->getIntegerType();
-
-  switch (QT->castAs<BuiltinType>()->getKind()) {
-  default:
-    llvm_unreachable("unknown type kind!");
-#define X(type, name)                                                          \
-  case BuiltinType::name:                                                      \
-    V.set##name(Data);                                                         \
-    break;
-    REPL_BUILTIN_TYPES
-#undef X
+  QualType QT = VRef.getType();
+  if (VRef.getKind() == Value::K_PtrOrObj) {
+    VRef.setPtr(va_arg(args, void *));
+  } else {
+    if (const auto *ET = QT->getAs<EnumType>())
+      QT = ET->getDecl()->getIntegerType();
+    switch (QT->castAs<BuiltinType>()->getKind()) {
+    default:
+      llvm_unreachable("unknown type kind!");
+      break;
+      // Types shorter than int are resolved as int, else va_arg has UB.
+    case BuiltinType::Bool:
+      VRef.setBool(va_arg(args, int));
+      break;
+    case BuiltinType::Char_S:
+      VRef.setChar_S(va_arg(args, int));
+      break;
+    case BuiltinType::SChar:
+      VRef.setSChar(va_arg(args, int));
+      break;
+    case BuiltinType::Char_U:
+      VRef.setChar_U(va_arg(args, unsigned));
+      break;
+    case BuiltinType::UChar:
+      VRef.setUChar(va_arg(args, unsigned));
+      break;
+    case BuiltinType::Short:
+      VRef.setShort(va_arg(args, int));
+      break;
+    case BuiltinType::UShort:
+      VRef.setUShort(va_arg(args, unsigned));
+      break;
+    case BuiltinType::Int:
+      VRef.setInt(va_arg(args, int));
+      break;
+    case BuiltinType::UInt:
+      VRef.setUInt(va_arg(args, unsigned));
+      break;
+    case BuiltinType::Long:
+      VRef.setLong(va_arg(args, long));
+      break;
+    case BuiltinType::ULong:
+      VRef.setULong(va_arg(args, unsigned long));
+      break;
+    case BuiltinType::LongLong:
+      VRef.setLongLong(va_arg(args, long long));
+      break;
+    case BuiltinType::ULongLong:
+      VRef.setULongLong(va_arg(args, unsigned long long));
+      break;
+      // Types shorter than double are resolved as double, else va_arg has UB.
+    case BuiltinType::Float:
+      VRef.setFloat(va_arg(args, double));
+      break;
+    case BuiltinType::Double:
+      VRef.setDouble(va_arg(args, double));
+      break;
+    case BuiltinType::LongDouble:
+      VRef.setLongDouble(va_arg(args, long double));
+      break;
+      // See REPL_BUILTIN_TYPES.
+    }
   }
-}
-
-REPL_EXTERNAL_VISIBILITY void
-__clang_Interpreter_SetValueNoAlloc(void *This, void *OutVal, void *OpaqueType,
-                                    unsigned long long Val) {
-  Value &VRef = *(Value *)OutVal;
-  VRef = Value(static_cast<Interpreter *>(This), OpaqueType);
-  SetValueDataBasedOnQualType(VRef, Val);
-}
-
-REPL_EXTERNAL_VISIBILITY void
-__clang_Interpreter_SetValueNoAlloc(void *This, void *OutVal, void *OpaqueType,
-                                    float Val) {
-  Value &VRef = *(Value *)OutVal;
-  VRef = Value(static_cast<Interpreter *>(This), OpaqueType);
-  VRef.setFloat(Val);
-}
-
-REPL_EXTERNAL_VISIBILITY void
-__clang_Interpreter_SetValueNoAlloc(void *This, void *OutVal, void *OpaqueType,
-                                    double Val) {
-  Value &VRef = *(Value *)OutVal;
-  VRef = Value(static_cast<Interpreter *>(This), OpaqueType);
-  VRef.setDouble(Val);
-}
-
-REPL_EXTERNAL_VISIBILITY void
-__clang_Interpreter_SetValueNoAlloc(void *This, void *OutVal, void *OpaqueType,
-                                    long double Val) {
-  Value &VRef = *(Value *)OutVal;
-  VRef = Value(static_cast<Interpreter *>(This), OpaqueType);
-  VRef.setLongDouble(Val);
+  va_end(args);
 }
 
 // A trampoline to work around the fact that operator placement new cannot

diff --git a/clang/lib/Lex/DependencyDirectivesScanner.cpp b/clang/lib/Lex/DependencyDirectivesScanner.cpp
@@ -62,17 +62,14 @@ struct DirectiveWithTokens {
 struct Scanner {
   Scanner(StringRef Input,
           SmallVectorImpl<dependency_directives_scan::Token> &Tokens,
-          DiagnosticsEngine *Diags, SourceLocation InputSourceLoc,
-          const LangOptions &LangOpts)
+          DiagnosticsEngine *Diags, SourceLocation InputSourceLoc)
       : Input(Input), Tokens(Tokens), Diags(Diags),
-        InputSourceLoc(InputSourceLoc),
-        LangOpts(getLangOptsForDepScanning(LangOpts)),
-        TheLexer(InputSourceLoc, this->LangOpts, Input.begin(), Input.begin(),
+        InputSourceLoc(InputSourceLoc), LangOpts(getLangOptsForDepScanning()),
+        TheLexer(InputSourceLoc, LangOpts, Input.begin(), Input.begin(),
                  Input.end()) {}
 
-  static LangOptions
-  getLangOptsForDepScanning(const LangOptions &invocationLangOpts) {
-    LangOptions LangOpts(invocationLangOpts);
+  static LangOptions getLangOptsForDepScanning() {
+    LangOptions LangOpts;
     // Set the lexer to use 'tok::at' for '@', instead of 'tok::unknown'.
     LangOpts.ObjC = true;
     LangOpts.LineComment = true;
@@ -703,7 +700,7 @@ bool Scanner::lex_Pragma(const char *&First, const char *const End) {
   SmallVector<dependency_directives_scan::Token> DiscardTokens;
   const char *Begin = Buffer.c_str();
   Scanner PragmaScanner{StringRef(Begin, Buffer.size()), DiscardTokens, Diags,
-                        InputSourceLoc, LangOptions()};
+                        InputSourceLoc};
 
   PragmaScanner.TheLexer.setParsingPreprocessorDirective(true);
   if (PragmaScanner.lexPragma(Begin, Buffer.end()))
@@ -953,10 +950,9 @@ bool Scanner::scan(SmallVectorImpl<Directive> &Directives) {
 
 bool clang::scanSourceForDependencyDirectives(
     StringRef Input, SmallVectorImpl<dependency_directives_scan::Token> &Tokens,
-    SmallVectorImpl<Directive> &Directives, const LangOptions &LangOpts,
-    DiagnosticsEngine *Diags, SourceLocation InputSourceLoc) {
-  return Scanner(Input, Tokens, Diags, InputSourceLoc, LangOpts)
-      .scan(Directives);
+    SmallVectorImpl<Directive> &Directives, DiagnosticsEngine *Diags,
+    SourceLocation InputSourceLoc) {
+  return Scanner(Input, Tokens, Diags, InputSourceLoc).scan(Directives);
 }
 
 void clang::printDependencyDirectivesAsSource(

diff --git a/clang/lib/Parse/ParseStmt.cpp b/clang/lib/Parse/ParseStmt.cpp
@@ -571,11 +571,8 @@ StmtResult Parser::ParseExprStatement(ParsedStmtContext StmtCtx) {
   }
 
   Token *CurTok = nullptr;
-  // If the semicolon is missing at the end of REPL input, consider if
-  // we want to do value printing. Note this is only enabled in C++ mode
-  // since part of the implementation requires C++ language features.
   // Note we shouldn't eat the token since the callback needs it.
-  if (Tok.is(tok::annot_repl_input_end) && Actions.getLangOpts().CPlusPlus)
+  if (Tok.is(tok::annot_repl_input_end))
     CurTok = &Tok;
   else
     // Otherwise, eat the semicolon.

diff --git a/clang/lib/Sema/Scope.cpp b/clang/lib/Sema/Scope.cpp
@@ -228,7 +228,11 @@ void Scope::dumpImpl(raw_ostream &OS) const {
       {CompoundStmtScope, "CompoundStmtScope"},
       {ClassInheritanceScope, "ClassInheritanceScope"},
       {CatchScope, "CatchScope"},
+      {ConditionVarScope, "ConditionVarScope"},
+      {OpenMPOrderClauseScope, "OpenMPOrderClauseScope"},
+      {LambdaScope, "LambdaScope"},
       {OpenACCComputeConstructScope, "OpenACCComputeConstructScope"},
+      {TypeAliasScope, "TypeAliasScope"},
       {FriendScope, "FriendScope"},
   };
 

diff --git a/clang/lib/Sema/SemaAMDGPU.cpp b/clang/lib/Sema/SemaAMDGPU.cpp
@@ -31,9 +31,9 @@ bool SemaAMDGPU::CheckAMDGCNBuiltinFunctionCall(unsigned BuiltinID,
     constexpr const int SizeIdx = 2;
     llvm::APSInt Size;
     Expr *ArgExpr = TheCall->getArg(SizeIdx);
-    ExprResult R = SemaRef.VerifyIntegerConstantExpression(ArgExpr, &Size);
-    if (R.isInvalid())
-      return true;
+    [[maybe_unused]] ExprResult R =
+        SemaRef.VerifyIntegerConstantExpression(ArgExpr, &Size);
+    assert(!R.isInvalid());
     switch (Size.getSExtValue()) {
     case 1:
     case 2:

diff --git a/clang/lib/Sema/SemaAvailability.cpp b/clang/lib/Sema/SemaAvailability.cpp
@@ -12,6 +12,7 @@
 
 #include "clang/AST/Attr.h"
 #include "clang/AST/Decl.h"
+#include "clang/AST/DeclTemplate.h"
 #include "clang/AST/RecursiveASTVisitor.h"
 #include "clang/Basic/DiagnosticSema.h"
 #include "clang/Basic/IdentifierTable.h"
@@ -46,6 +47,10 @@ static const AvailabilityAttr *getAttrForPlatform(ASTContext &Context,
   // Check each AvailabilityAttr to find the one for this platform.
   // For multiple attributes with the same platform try to find one for this
   // environment.
+  // The attribute is always on the FunctionDecl, not on the
+  // FunctionTemplateDecl.
+  if (const auto *FTD = dyn_cast<FunctionTemplateDecl>(D))
+    D = FTD->getTemplatedDecl();
   for (const auto *A : D->attrs()) {
     if (const auto *Avail = dyn_cast<AvailabilityAttr>(A)) {
       // FIXME: this is copied from CheckAvailability. We should try to

diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
@@ -2288,7 +2288,8 @@ void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
     // Partial translation units that are created in incremental processing must
     // not clean up the IdResolver because PTUs should take into account the
     // declarations that came from previous PTUs.
-    if (!PP.isIncrementalProcessingEnabled() || getLangOpts().ObjC)
+    if (!PP.isIncrementalProcessingEnabled() || getLangOpts().ObjC ||
+        getLangOpts().CPlusPlus)
       IdResolver.RemoveDecl(D);
 
     // Warn on it if we are shadowing a declaration.

diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
@@ -5572,9 +5572,10 @@ ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
         Res = Immediate.TransformInitializer(Param->getInit(),
                                              /*NotCopy=*/false);
       });
-      if (Res.isUsable())
-        Res = ConvertParamDefaultArgument(Param, Res.get(),
-                                          Res.get()->getBeginLoc());
+      if (Res.isInvalid())
+        return ExprError();
+      Res = ConvertParamDefaultArgument(Param, Res.get(),
+                                        Res.get()->getBeginLoc());
       if (Res.isInvalid())
         return ExprError();
       Init = Res.get();
@@ -5608,10 +5609,9 @@ ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) {
     InitializationContext.emplace(Loc, Field, CurContext);
 
   Expr *Init = nullptr;
-  bool HasRewrittenInit = false;
 
   bool NestedDefaultChecking = isCheckingDefaultArgumentOrInitializer();
-  bool InLifetimeExtendingContext = isInLifetimeExtendingContext();
+
   EnterExpressionEvaluationContext EvalContext(
       *this, ExpressionEvaluationContext::PotentiallyEvaluated, Field);
 
@@ -5646,36 +5646,19 @@ ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) {
   ImmediateCallVisitor V(getASTContext());
   if (!NestedDefaultChecking)
     V.TraverseDecl(Field);
-
-  // CWG1815
-  // Support lifetime extension of temporary created by aggregate
-  // initialization using a default member initializer. We should always rebuild
-  // the initializer if it contains any temporaries (if the initializer
-  // expression is an ExprWithCleanups). Then make sure the normal lifetime
-  // extension code recurses into the default initializer and does lifetime
-  // extension when warranted.
-  bool ContainsAnyTemporaries =
-      isa_and_present<ExprWithCleanups>(Field->getInClassInitializer());
-  if (V.HasImmediateCalls || InLifetimeExtendingContext ||
-      ContainsAnyTemporaries) {
-    HasRewrittenInit = true;
+  if (V.HasImmediateCalls) {
     ExprEvalContexts.back().DelayedDefaultInitializationContext = {Loc, Field,
                                                                    CurContext};
     ExprEvalContexts.back().IsCurrentlyCheckingDefaultArgumentOrInitializer =
         NestedDefaultChecking;
-    // Pass down lifetime extending flag, and collect temporaries in
-    // CreateMaterializeTemporaryExpr when we rewrite the call argument.
-    keepInLifetimeExtendingContext();
+
     EnsureImmediateInvocationInDefaultArgs Immediate(*this);
     ExprResult Res;
-
-    // Rebuild CXXDefaultInitExpr might cause diagnostics.
-    SFINAETrap Trap(*this);
     runWithSufficientStackSpace(Loc, [&] {
       Res = Immediate.TransformInitializer(Field->getInClassInitializer(),
                                            /*CXXDirectInit=*/false);
     });
-    if (Res.isUsable())
+    if (!Res.isInvalid())
       Res = ConvertMemberDefaultInitExpression(Field, Res.get(), Loc);
     if (Res.isInvalid()) {
       Field->setInvalidDecl();
@@ -5702,7 +5685,7 @@ ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) {
 
     return CXXDefaultInitExpr::Create(Context, InitializationContext->Loc,
                                       Field, InitializationContext->Context,
-                                      HasRewrittenInit ? Init : nullptr);
+                                      Init);
   }
 
   // DR1351:

diff --git a/clang/lib/Sema/SemaExprCXX.cpp b/clang/lib/Sema/SemaExprCXX.cpp
@@ -1555,6 +1555,9 @@ Sema::BuildCXXTypeConstructExpr(TypeSourceInfo *TInfo,
                                 bool ListInitialization) {
   QualType Ty = TInfo->getType();
   SourceLocation TyBeginLoc = TInfo->getTypeLoc().getBeginLoc();
+
+  assert((!ListInitialization || Exprs.size() == 1) &&
+         "List initialization must have exactly one expression.");
   SourceRange FullRange = SourceRange(TyBeginLoc, RParenOrBraceLoc);
 
   InitializedEntity Entity =
@@ -5126,6 +5129,7 @@ static bool CheckUnaryTypeTraitTypeCompleteness(Sema &S, TypeTrait UTT,
   case UTT_IsStandardLayout:
   case UTT_IsPOD:
   case UTT_IsLiteral:
+  case UTT_IsBitwiseCloneable:
   // By analogy, is_trivially_relocatable and is_trivially_equality_comparable
   // impose the same constraints.
   case UTT_IsTriviallyRelocatable:
@@ -5619,6 +5623,8 @@ static bool EvaluateUnaryTypeTrait(Sema &Self, TypeTrait UTT,
     return C.hasUniqueObjectRepresentations(T);
   case UTT_IsTriviallyRelocatable:
     return T.isTriviallyRelocatableType(C);
+  case UTT_IsBitwiseCloneable:
+    return T.isBitwiseCloneableType(C);
   case UTT_IsReferenceable:
     return T.isReferenceable();
   case UTT_CanPassInRegs:

diff --git a/clang/lib/Sema/SemaInit.cpp b/clang/lib/Sema/SemaInit.cpp
@@ -8063,6 +8063,11 @@ static void visitLocalsRetainedByInitializer(IndirectLocalPath &Path,
 enum PathLifetimeKind {
   /// Lifetime-extend along this path.
   Extend,
+  /// We should lifetime-extend, but we don't because (due to technical
+  /// limitations) we can't. This happens for default member initializers,
+  /// which we don't clone for every use, so we don't have a unique
+  /// MaterializeTemporaryExpr to update.
+  ShouldExtend,
   /// Do not lifetime extend along this path.
   NoExtend
 };
@@ -8074,7 +8079,7 @@ shouldLifetimeExtendThroughPath(const IndirectLocalPath &Path) {
   PathLifetimeKind Kind = PathLifetimeKind::Extend;
   for (auto Elem : Path) {
     if (Elem.Kind == IndirectLocalPathEntry::DefaultInit)
-      Kind = PathLifetimeKind::Extend;
+      Kind = PathLifetimeKind::ShouldExtend;
     else if (Elem.Kind != IndirectLocalPathEntry::LambdaCaptureInit)
       return PathLifetimeKind::NoExtend;
   }
@@ -8194,6 +8199,18 @@ void Sema::checkInitializerLifetime(const InitializedEntity &Entity,
                               ExtendingEntity->allocateManglingNumber());
         // Also visit the temporaries lifetime-extended by this initializer.
         return true;
+
+      case PathLifetimeKind::ShouldExtend:
+        // We're supposed to lifetime-extend the temporary along this path (per
+        // the resolution of DR1815), but we don't support that yet.
+        //
+        // FIXME: Properly handle this situation. Perhaps the easiest approach
+        // would be to clone the initializer expression on each use that would
+        // lifetime extend its temporaries.
+        Diag(DiagLoc, diag::warn_unsupported_lifetime_extension)
+            << RK << DiagRange;
+        break;
+
       case PathLifetimeKind::NoExtend:
         // If the path goes through the initialization of a variable or field,
         // it can't possibly reach a temporary created in this full-expression.

diff --git a/clang/lib/Sema/SemaOpenACC.cpp b/clang/lib/Sema/SemaOpenACC.cpp
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
@@ -14172,13 +14172,6 @@ TreeTransform<Derived>::TransformCXXTemporaryObjectExpr(
     if (TransformExprs(E->getArgs(), E->getNumArgs(), true, Args,
                        &ArgumentChanged))
       return ExprError();
-
-    if (E->isListInitialization() && !E->isStdInitListInitialization()) {
-      ExprResult Res = RebuildInitList(E->getBeginLoc(), Args, E->getEndLoc());
-      if (Res.isInvalid())
-        return ExprError();
-      Args = {Res.get()};
-    }
   }
 
   if (!getDerived().AlwaysRebuild() &&
@@ -14190,9 +14183,12 @@ TreeTransform<Derived>::TransformCXXTemporaryObjectExpr(
     return SemaRef.MaybeBindToTemporary(E);
   }
 
+  // FIXME: We should just pass E->isListInitialization(), but we're not
+  // prepared to handle list-initialization without a child InitListExpr.
   SourceLocation LParenLoc = T->getTypeLoc().getEndLoc();
   return getDerived().RebuildCXXTemporaryObjectExpr(
-      T, LParenLoc, Args, E->getEndLoc(), E->isListInitialization());
+      T, LParenLoc, Args, E->getEndLoc(),
+      /*ListInitialization=*/LParenLoc.isInvalid());
 }
 
 template<typename Derived>

diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
@@ -1658,7 +1658,7 @@ bool ASTReader::ReadSLocEntry(int ID) {
 
     unsigned NumFileDecls = Record[7];
     if (NumFileDecls && ContextObj) {
-      const LocalDeclID *FirstDecl = F->FileSortedDecls + Record[6];
+      const unaligned_decl_id_t *FirstDecl = F->FileSortedDecls + Record[6];
       assert(F->FileSortedDecls && "FILE_SORTED_DECLS not encountered yet ?");
       FileDeclIDs[FID] =
           FileDeclsInfo(F, llvm::ArrayRef(FirstDecl, NumFileDecls));
@@ -3377,26 +3377,11 @@ llvm::Error ASTReader::ReadASTBlock(ModuleFile &F,
             "duplicate DECL_OFFSET record in AST file");
       F.DeclOffsets = (const DeclOffset *)Blob.data();
       F.LocalNumDecls = Record[0];
-      unsigned LocalBaseDeclID = Record[1];
-      F.BaseDeclID = getTotalNumDecls();
-
-      if (F.LocalNumDecls > 0) {
-        // Introduce the global -> local mapping for declarations within this
-        // module.
-        GlobalDeclMap.insert(std::make_pair(
-            GlobalDeclID(getTotalNumDecls() + NUM_PREDEF_DECL_IDS), &F));
-
-        // Introduce the local -> global mapping for declarations within this
-        // module.
-        F.DeclRemap.insertOrReplace(
-          std::make_pair(LocalBaseDeclID, F.BaseDeclID - LocalBaseDeclID));
-
-        // Introduce the global -> local mapping for declarations within this
-        // module.
-        F.GlobalToLocalDeclIDs[&F] = LocalBaseDeclID;
+      F.BaseDeclIndex = getTotalNumDecls();
 
+      if (F.LocalNumDecls > 0)
         DeclsLoaded.resize(DeclsLoaded.size() + F.LocalNumDecls);
-      }
+
       break;
     }
 
@@ -3631,7 +3616,7 @@ llvm::Error ASTReader::ReadASTBlock(ModuleFile &F,
       break;
 
     case FILE_SORTED_DECLS:
-      F.FileSortedDecls = (const LocalDeclID *)Blob.data();
+      F.FileSortedDecls = (const unaligned_decl_id_t *)Blob.data();
       F.NumFileSortedDecls = Record[0];
       break;
 
@@ -4058,7 +4043,6 @@ void ASTReader::ReadModuleOffsetMap(ModuleFile &F) const {
   RemapBuilder PreprocessedEntityRemap(F.PreprocessedEntityRemap);
   RemapBuilder SubmoduleRemap(F.SubmoduleRemap);
   RemapBuilder SelectorRemap(F.SelectorRemap);
-  RemapBuilder DeclRemap(F.DeclRemap);
   RemapBuilder TypeRemap(F.TypeRemap);
 
   auto &ImportedModuleVector = F.TransitiveImports;
@@ -4097,8 +4081,6 @@ void ASTReader::ReadModuleOffsetMap(ModuleFile &F) const {
         endian::readNext<uint32_t, llvm::endianness::little>(Data);
     uint32_t SelectorIDOffset =
         endian::readNext<uint32_t, llvm::endianness::little>(Data);
-    uint32_t DeclIDOffset =
-        endian::readNext<uint32_t, llvm::endianness::little>(Data);
     uint32_t TypeIndexOffset =
         endian::readNext<uint32_t, llvm::endianness::little>(Data);
 
@@ -4116,11 +4098,7 @@ void ASTReader::ReadModuleOffsetMap(ModuleFile &F) const {
               PreprocessedEntityRemap);
     mapOffset(SubmoduleIDOffset, OM->BaseSubmoduleID, SubmoduleRemap);
     mapOffset(SelectorIDOffset, OM->BaseSelectorID, SelectorRemap);
-    mapOffset(DeclIDOffset, OM->BaseDeclID, DeclRemap);
     mapOffset(TypeIndexOffset, OM->BaseTypeIndex, TypeRemap);
-
-    // Global -> local mappings.
-    F.GlobalToLocalDeclIDs[OM] = DeclIDOffset;
   }
 }
 
@@ -4645,7 +4623,7 @@ ASTReader::ASTReadResult ASTReader::ReadAST(StringRef FileName, ModuleKind Type,
   // that we load any additional categories.
   if (ContextObj) {
     for (unsigned I = 0, N = ObjCClassesLoaded.size(); I != N; ++I) {
-      loadObjCCategories(GlobalDeclID(ObjCClassesLoaded[I]->getGlobalID()),
+      loadObjCCategories(ObjCClassesLoaded[I]->getGlobalID(),
                          ObjCClassesLoaded[I], PreviousGeneration);
     }
   }
@@ -7644,50 +7622,59 @@ CXXBaseSpecifier *ASTReader::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
 
 GlobalDeclID ASTReader::getGlobalDeclID(ModuleFile &F,
                                         LocalDeclID LocalID) const {
-  DeclID ID = LocalID.get();
-  if (ID < NUM_PREDEF_DECL_IDS)
-    return GlobalDeclID(ID);
+  if (LocalID.get() < NUM_PREDEF_DECL_IDS)
+    return GlobalDeclID(LocalID.get());
+
+  unsigned OwningModuleFileIndex = LocalID.getModuleFileIndex();
+  DeclID ID = LocalID.getLocalDeclIndex();
 
   if (!F.ModuleOffsetMap.empty())
     ReadModuleOffsetMap(F);
 
-  ContinuousRangeMap<DeclID, int, 2>::iterator I =
-      F.DeclRemap.find(ID - NUM_PREDEF_DECL_IDS);
-  assert(I != F.DeclRemap.end() && "Invalid index into decl index remap");
+  ModuleFile *OwningModuleFile =
+      OwningModuleFileIndex == 0
+          ? &F
+          : F.TransitiveImports[OwningModuleFileIndex - 1];
+
+  if (OwningModuleFileIndex == 0)
+    ID -= NUM_PREDEF_DECL_IDS;
 
-  return GlobalDeclID(ID + I->second);
+  uint64_t NewModuleFileIndex = OwningModuleFile->Index + 1;
+  return GlobalDeclID(ID, NewModuleFileIndex);
 }
 
 bool ASTReader::isDeclIDFromModule(GlobalDeclID ID, ModuleFile &M) const {
   // Predefined decls aren't from any module.
   if (ID.get() < NUM_PREDEF_DECL_IDS)
     return false;
 
-  return ID.get() - NUM_PREDEF_DECL_IDS >= M.BaseDeclID &&
-         ID.get() - NUM_PREDEF_DECL_IDS < M.BaseDeclID + M.LocalNumDecls;
+  unsigned ModuleFileIndex = ID.getModuleFileIndex();
+  return M.Index == ModuleFileIndex - 1;
+}
+
+ModuleFile *ASTReader::getOwningModuleFile(GlobalDeclID ID) const {
+  // Predefined decls aren't from any module.
+  if (ID.get() < NUM_PREDEF_DECL_IDS)
+    return nullptr;
+
+  uint64_t ModuleFileIndex = ID.getModuleFileIndex();
+  assert(ModuleFileIndex && "Untranslated Local Decl?");
+
+  return &getModuleManager()[ModuleFileIndex - 1];
 }
 
-ModuleFile *ASTReader::getOwningModuleFile(const Decl *D) {
+ModuleFile *ASTReader::getOwningModuleFile(const Decl *D) const {
   if (!D->isFromASTFile())
     return nullptr;
-  GlobalDeclMapType::const_iterator I =
-      GlobalDeclMap.find(GlobalDeclID(D->getGlobalID()));
-  assert(I != GlobalDeclMap.end() && "Corrupted global declaration map");
-  return I->second;
+
+  return getOwningModuleFile(D->getGlobalID());
 }
 
 SourceLocation ASTReader::getSourceLocationForDeclID(GlobalDeclID ID) {
   if (ID.get() < NUM_PREDEF_DECL_IDS)
     return SourceLocation();
 
-  unsigned Index = ID.get() - NUM_PREDEF_DECL_IDS;
-
-  if (Index > DeclsLoaded.size()) {
-    Error("declaration ID out-of-range for AST file");
-    return SourceLocation();
-  }
-
-  if (Decl *D = DeclsLoaded[Index])
+  if (Decl *D = GetExistingDecl(ID))
     return D->getLocation();
 
   SourceLocation Loc;
@@ -7754,8 +7741,19 @@ static Decl *getPredefinedDecl(ASTContext &Context, PredefinedDeclIDs ID) {
   llvm_unreachable("PredefinedDeclIDs unknown enum value");
 }
 
+unsigned ASTReader::translateGlobalDeclIDToIndex(GlobalDeclID GlobalID) const {
+  ModuleFile *OwningModuleFile = getOwningModuleFile(GlobalID);
+  if (!OwningModuleFile) {
+    assert(GlobalID.get() < NUM_PREDEF_DECL_IDS && "Untransalted Global ID?");
+    return GlobalID.get();
+  }
+
+  return OwningModuleFile->BaseDeclIndex + GlobalID.getLocalDeclIndex();
+}
+
 Decl *ASTReader::GetExistingDecl(GlobalDeclID ID) {
   assert(ContextObj && "reading decl with no AST context");
+
   if (ID.get() < NUM_PREDEF_DECL_IDS) {
     Decl *D = getPredefinedDecl(*ContextObj, (PredefinedDeclIDs)ID);
     if (D) {
@@ -7768,7 +7766,7 @@ Decl *ASTReader::GetExistingDecl(GlobalDeclID ID) {
     return D;
   }
 
-  unsigned Index = ID.get() - NUM_PREDEF_DECL_IDS;
+  unsigned Index = translateGlobalDeclIDToIndex(ID);
 
   if (Index >= DeclsLoaded.size()) {
     assert(0 && "declaration ID out-of-range for AST file");
@@ -7783,7 +7781,7 @@ Decl *ASTReader::GetDecl(GlobalDeclID ID) {
   if (ID.get() < NUM_PREDEF_DECL_IDS)
     return GetExistingDecl(ID);
 
-  unsigned Index = ID.get() - NUM_PREDEF_DECL_IDS;
+  unsigned Index = translateGlobalDeclIDToIndex(ID);
 
   if (Index >= DeclsLoaded.size()) {
     assert(0 && "declaration ID out-of-range for AST file");
@@ -7802,20 +7800,31 @@ Decl *ASTReader::GetDecl(GlobalDeclID ID) {
 
 LocalDeclID ASTReader::mapGlobalIDToModuleFileGlobalID(ModuleFile &M,
                                                        GlobalDeclID GlobalID) {
-  DeclID ID = GlobalID.get();
-  if (ID < NUM_PREDEF_DECL_IDS)
+  if (GlobalID.get() < NUM_PREDEF_DECL_IDS)
+    return LocalDeclID(GlobalID.get());
+
+  if (!M.ModuleOffsetMap.empty())
+    ReadModuleOffsetMap(M);
+
+  ModuleFile *Owner = getOwningModuleFile(GlobalID);
+  DeclID ID = GlobalID.getLocalDeclIndex();
+
+  if (Owner == &M) {
+    ID += NUM_PREDEF_DECL_IDS;
     return LocalDeclID(ID);
+  }
 
-  GlobalDeclMapType::const_iterator I = GlobalDeclMap.find(GlobalID);
-  assert(I != GlobalDeclMap.end() && "Corrupted global declaration map");
-  ModuleFile *Owner = I->second;
+  uint64_t OrignalModuleFileIndex = 0;
+  for (unsigned I = 0; I < M.TransitiveImports.size(); I++)
+    if (M.TransitiveImports[I] == Owner) {
+      OrignalModuleFileIndex = I + 1;
+      break;
+    }
 
-  llvm::DenseMap<ModuleFile *, DeclID>::iterator Pos =
-      M.GlobalToLocalDeclIDs.find(Owner);
-  if (Pos == M.GlobalToLocalDeclIDs.end())
+  if (!OrignalModuleFileIndex)
     return LocalDeclID();
 
-  return LocalDeclID(ID - Owner->BaseDeclID + Pos->second);
+  return LocalDeclID(ID, OrignalModuleFileIndex);
 }
 
 GlobalDeclID ASTReader::ReadDeclID(ModuleFile &F, const RecordData &Record,
@@ -7894,32 +7903,34 @@ void ASTReader::FindExternalLexicalDecls(
 
 namespace {
 
-class DeclIDComp {
+class UnalignedDeclIDComp {
   ASTReader &Reader;
   ModuleFile &Mod;
 
 public:
-  DeclIDComp(ASTReader &Reader, ModuleFile &M) : Reader(Reader), Mod(M) {}
+  UnalignedDeclIDComp(ASTReader &Reader, ModuleFile &M)
+      : Reader(Reader), Mod(M) {}
 
-  bool operator()(LocalDeclID L, LocalDeclID R) const {
+  bool operator()(unaligned_decl_id_t L, unaligned_decl_id_t R) const {
     SourceLocation LHS = getLocation(L);
     SourceLocation RHS = getLocation(R);
     return Reader.getSourceManager().isBeforeInTranslationUnit(LHS, RHS);
   }
 
-  bool operator()(SourceLocation LHS, LocalDeclID R) const {
+  bool operator()(SourceLocation LHS, unaligned_decl_id_t R) const {
     SourceLocation RHS = getLocation(R);
     return Reader.getSourceManager().isBeforeInTranslationUnit(LHS, RHS);
   }
 
-  bool operator()(LocalDeclID L, SourceLocation RHS) const {
+  bool operator()(unaligned_decl_id_t L, SourceLocation RHS) const {
     SourceLocation LHS = getLocation(L);
     return Reader.getSourceManager().isBeforeInTranslationUnit(LHS, RHS);
   }
 
-  SourceLocation getLocation(LocalDeclID ID) const {
+  SourceLocation getLocation(unaligned_decl_id_t ID) const {
     return Reader.getSourceManager().getFileLoc(
-            Reader.getSourceLocationForDeclID(Reader.getGlobalDeclID(Mod, ID)));
+        Reader.getSourceLocationForDeclID(
+            Reader.getGlobalDeclID(Mod, (LocalDeclID)ID)));
   }
 };
 
@@ -7942,8 +7953,8 @@ void ASTReader::FindFileRegionDecls(FileID File,
     BeginLoc = SM.getLocForStartOfFile(File).getLocWithOffset(Offset);
   SourceLocation EndLoc = BeginLoc.getLocWithOffset(Length);
 
-  DeclIDComp DIDComp(*this, *DInfo.Mod);
-  ArrayRef<LocalDeclID>::iterator BeginIt =
+  UnalignedDeclIDComp DIDComp(*this, *DInfo.Mod);
+  ArrayRef<unaligned_decl_id_t>::iterator BeginIt =
       llvm::lower_bound(DInfo.Decls, BeginLoc, DIDComp);
   if (BeginIt != DInfo.Decls.begin())
     --BeginIt;
@@ -7952,17 +7963,18 @@ void ASTReader::FindFileRegionDecls(FileID File,
   // to backtrack until we find it otherwise we will fail to report that the
   // region overlaps with an objc container.
   while (BeginIt != DInfo.Decls.begin() &&
-         GetDecl(getGlobalDeclID(*DInfo.Mod, *BeginIt))
+         GetDecl(getGlobalDeclID(*DInfo.Mod, (LocalDeclID)(*BeginIt)))
              ->isTopLevelDeclInObjCContainer())
     --BeginIt;
 
-  ArrayRef<LocalDeclID>::iterator EndIt =
+  ArrayRef<unaligned_decl_id_t>::iterator EndIt =
       llvm::upper_bound(DInfo.Decls, EndLoc, DIDComp);
   if (EndIt != DInfo.Decls.end())
     ++EndIt;
 
-  for (ArrayRef<LocalDeclID>::iterator DIt = BeginIt; DIt != EndIt; ++DIt)
-    Decls.push_back(GetDecl(getGlobalDeclID(*DInfo.Mod, *DIt)));
+  for (ArrayRef<unaligned_decl_id_t>::iterator DIt = BeginIt; DIt != EndIt;
+       ++DIt)
+    Decls.push_back(GetDecl(getGlobalDeclID(*DInfo.Mod, (LocalDeclID)(*DIt))));
 }
 
 bool
@@ -8169,7 +8181,6 @@ LLVM_DUMP_METHOD void ASTReader::dump() {
   dumpModuleIDMap("Global bit offset map", GlobalBitOffsetsMap);
   dumpModuleIDMap("Global source location entry map", GlobalSLocEntryMap);
   dumpModuleIDMap("Global type map", GlobalTypeMap);
-  dumpModuleIDMap("Global declaration map", GlobalDeclMap);
   dumpModuleIDMap("Global identifier map", GlobalIdentifierMap);
   dumpModuleIDMap("Global macro map", GlobalMacroMap);
   dumpModuleIDMap("Global submodule map", GlobalSubmoduleMap);
@@ -9185,7 +9196,7 @@ void ASTRecordReader::readUnresolvedSet(LazyASTUnresolvedSet &Set) {
   while (NumDecls--) {
     GlobalDeclID ID = readDeclID();
     AccessSpecifier AS = (AccessSpecifier) readInt();
-    Set.addLazyDecl(getContext(), ID.get(), AS);
+    Set.addLazyDecl(getContext(), ID, AS);
   }
 }
 

diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -2924,7 +2924,7 @@ void ASTDeclReader::mergeTemplatePattern(RedeclarableTemplateDecl *D,
   auto *ExistingPattern = Existing->getTemplatedDecl();
   RedeclarableResult Result(
       /*MergeWith*/ ExistingPattern,
-      GlobalDeclID(DPattern->getCanonicalDecl()->getGlobalID()), IsKeyDecl);
+      DPattern->getCanonicalDecl()->getGlobalID(), IsKeyDecl);
 
   if (auto *DClass = dyn_cast<CXXRecordDecl>(DPattern)) {
     // Merge with any existing definition.
@@ -3245,11 +3245,10 @@ bool ASTReader::isConsumerInterestedIn(Decl *D) {
 /// Get the correct cursor and offset for loading a declaration.
 ASTReader::RecordLocation ASTReader::DeclCursorForID(GlobalDeclID ID,
                                                      SourceLocation &Loc) {
-  GlobalDeclMapType::iterator I = GlobalDeclMap.find(ID);
-  assert(I != GlobalDeclMap.end() && "Corrupted global declaration map");
-  ModuleFile *M = I->second;
-  const DeclOffset &DOffs =
-      M->DeclOffsets[ID.get() - M->BaseDeclID - NUM_PREDEF_DECL_IDS];
+  ModuleFile *M = getOwningModuleFile(ID);
+  assert(M);
+  unsigned LocalDeclIndex = ID.getLocalDeclIndex();
+  const DeclOffset &DOffs = M->DeclOffsets[LocalDeclIndex];
   Loc = ReadSourceLocation(*M, DOffs.getRawLoc());
   return RecordLocation(M, DOffs.getBitOffset(M->DeclsBlockStartOffset));
 }
@@ -3792,7 +3791,6 @@ void ASTReader::markIncompleteDeclChain(Decl *D) {
 
 /// Read the declaration at the given offset from the AST file.
 Decl *ASTReader::ReadDeclRecord(GlobalDeclID ID) {
-  unsigned Index = ID.get() - NUM_PREDEF_DECL_IDS;
   SourceLocation DeclLoc;
   RecordLocation Loc = DeclCursorForID(ID, DeclLoc);
   llvm::BitstreamCursor &DeclsCursor = Loc.F->DeclsCursor;
@@ -4123,7 +4121,7 @@ Decl *ASTReader::ReadDeclRecord(GlobalDeclID ID) {
   }
 
   assert(D && "Unknown declaration reading AST file");
-  LoadedDecl(Index, D);
+  LoadedDecl(translateGlobalDeclIDToIndex(ID), D);
   // Set the DeclContext before doing any deserialization, to make sure internal
   // calls to Decl::getASTContext() by Decl's methods will find the
   // TranslationUnitDecl without crashing.
@@ -4449,7 +4447,7 @@ namespace {
                            M.ObjCCategoriesMap + M.LocalNumObjCCategoriesInMap,
                            Compare);
       if (Result == M.ObjCCategoriesMap + M.LocalNumObjCCategoriesInMap ||
-          Result->DefinitionID != LocalID) {
+          Result->getDefinitionID() != LocalID) {
         // We didn't find anything. If the class definition is in this module
         // file, then the module files it depends on cannot have any categories,
         // so suppress further lookup.

diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
@@ -3357,12 +3357,10 @@ void ASTWriter::WriteTypeDeclOffsets() {
   Abbrev = std::make_shared<BitCodeAbbrev>();
   Abbrev->Add(BitCodeAbbrevOp(DECL_OFFSET));
   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of declarations
-  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // base decl ID
   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // declarations block
   unsigned DeclOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
   {
-    RecordData::value_type Record[] = {DECL_OFFSET, DeclOffsets.size(),
-                                       FirstDeclID.get() - NUM_PREDEF_DECL_IDS};
+    RecordData::value_type Record[] = {DECL_OFFSET, DeclOffsets.size()};
     Stream.EmitRecordWithBlob(DeclOffsetAbbrev, Record, bytes(DeclOffsets));
   }
 }
@@ -5423,7 +5421,6 @@ ASTFileSignature ASTWriter::WriteASTCore(Sema &SemaRef, StringRef isysroot,
                           M.NumPreprocessedEntities);
         writeBaseIDOrNone(M.BaseSubmoduleID, M.LocalNumSubmodules);
         writeBaseIDOrNone(M.BaseSelectorID, M.LocalNumSelectors);
-        writeBaseIDOrNone(M.BaseDeclID, M.LocalNumDecls);
         writeBaseIDOrNone(M.BaseTypeIndex, M.LocalNumTypes);
       }
     }
@@ -6618,13 +6615,11 @@ void ASTWriter::ReaderInitialized(ASTReader *Reader) {
 
   // Note, this will get called multiple times, once one the reader starts up
   // and again each time it's done reading a PCH or module.
-  FirstDeclID = LocalDeclID(NUM_PREDEF_DECL_IDS + Chain->getTotalNumDecls());
   FirstTypeID = NUM_PREDEF_TYPE_IDS + Chain->getTotalNumTypes();
   FirstIdentID = NUM_PREDEF_IDENT_IDS + Chain->getTotalNumIdentifiers();
   FirstMacroID = NUM_PREDEF_MACRO_IDS + Chain->getTotalNumMacros();
   FirstSubmoduleID = NUM_PREDEF_SUBMODULE_IDS + Chain->getTotalNumSubmodules();
   FirstSelectorID = NUM_PREDEF_SELECTOR_IDS + Chain->getTotalNumSelectors();
-  NextDeclID = FirstDeclID;
   NextTypeID = FirstTypeID;
   NextIdentID = FirstIdentID;
   NextMacroID = FirstMacroID;

diff --git a/clang/lib/Serialization/ModuleFile.cpp b/clang/lib/Serialization/ModuleFile.cpp
@@ -87,7 +87,6 @@ LLVM_DUMP_METHOD void ModuleFile::dump() {
                << "  Number of types: " << LocalNumTypes << '\n';
   dumpLocalRemap("Type index local -> global map", TypeRemap);
 
-  llvm::errs() << "  Base decl ID: " << BaseDeclID << '\n'
+  llvm::errs() << "  Base decl index: " << BaseDeclIndex << '\n'
                << "  Number of decls: " << LocalNumDecls << '\n';
-  dumpLocalRemap("Decl ID local -> global map", DeclRemap);
 }
diff --git a/clang/lib/StaticAnalyzer/Checkers/CMakeLists.txt b/clang/lib/StaticAnalyzer/Checkers/CMakeLists.txt
@@ -78,6 +78,7 @@ add_clang_library(clangStaticAnalyzerCheckers
   NoReturnFunctionChecker.cpp
   NonNullParamChecker.cpp
   NonnullGlobalConstantsChecker.cpp
+  NoOwnershipChangeVisitor.cpp
   NullabilityChecker.cpp
   NumberObjectConversionChecker.cpp
   ObjCAtSyncChecker.cpp

diff --git a/clang/lib/StaticAnalyzer/Checkers/MallocChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/MallocChecker.cpp
@@ -46,6 +46,7 @@
 
 #include "AllocationState.h"
 #include "InterCheckerAPI.h"
+#include "NoOwnershipChangeVisitor.h"
 #include "clang/AST/Attr.h"
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/DeclTemplate.h"
@@ -79,13 +80,11 @@
 #include "clang/StaticAnalyzer/Core/PathSensitive/SymbolManager.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SetOperations.h"
-#include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
-#include <climits>
 #include <functional>
 #include <optional>
 #include <utility>
@@ -414,7 +413,7 @@ class MallocChecker
   bool isFreeingCall(const CallEvent &Call) const;
   static bool isFreeingOwnershipAttrCall(const FunctionDecl *Func);
 
-  friend class NoOwnershipChangeVisitor;
+  friend class NoMemOwnershipChangeVisitor;
 
   CallDescriptionMap<CheckFn> AllocatingMemFnMap{
       {{CDM::CLibrary, {"alloca"}, 1}, &MallocChecker::checkAlloca},
@@ -765,61 +764,8 @@ class MallocChecker
 //===----------------------------------------------------------------------===//
 
 namespace {
-class NoOwnershipChangeVisitor final : public NoStateChangeFuncVisitor {
-  // The symbol whose (lack of) ownership change we are interested in.
-  SymbolRef Sym;
-  const MallocChecker &Checker;
-  using OwnerSet = llvm::SmallPtrSet<const MemRegion *, 8>;
-
-  // Collect which entities point to the allocated memory, and could be
-  // responsible for deallocating it.
-  class OwnershipBindingsHandler : public StoreManager::BindingsHandler {
-    SymbolRef Sym;
-    OwnerSet &Owners;
-
-  public:
-    OwnershipBindingsHandler(SymbolRef Sym, OwnerSet &Owners)
-        : Sym(Sym), Owners(Owners) {}
-
-    bool HandleBinding(StoreManager &SMgr, Store Store, const MemRegion *Region,
-                       SVal Val) override {
-      if (Val.getAsSymbol() == Sym)
-        Owners.insert(Region);
-      return true;
-    }
-
-    LLVM_DUMP_METHOD void dump() const { dumpToStream(llvm::errs()); }
-    LLVM_DUMP_METHOD void dumpToStream(llvm::raw_ostream &out) const {
-      out << "Owners: {\n";
-      for (const MemRegion *Owner : Owners) {
-        out << "  ";
-        Owner->dumpToStream(out);
-        out << ",\n";
-      }
-      out << "}\n";
-    }
-  };
-
+class NoMemOwnershipChangeVisitor final : public NoOwnershipChangeVisitor {
 protected:
-  OwnerSet getOwnersAtNode(const ExplodedNode *N) {
-    OwnerSet Ret;
-
-    ProgramStateRef State = N->getState();
-    OwnershipBindingsHandler Handler{Sym, Ret};
-    State->getStateManager().getStoreManager().iterBindings(State->getStore(),
-                                                            Handler);
-    return Ret;
-  }
-
-  LLVM_DUMP_METHOD static std::string
-  getFunctionName(const ExplodedNode *CallEnterN) {
-    if (const CallExpr *CE = llvm::dyn_cast_or_null<CallExpr>(
-            CallEnterN->getLocationAs<CallEnter>()->getCallExpr()))
-      if (const FunctionDecl *FD = CE->getDirectCallee())
-        return FD->getQualifiedNameAsString();
-    return "";
-  }
-
   /// Syntactically checks whether the callee is a deallocating function. Since
   /// we have no path-sensitive information on this call (we would need a
   /// CallEvent instead of a CallExpr for that), its possible that a
@@ -828,8 +774,9 @@ class NoOwnershipChangeVisitor final : public NoStateChangeFuncVisitor {
   /// See namespace `memory_passed_to_fn_call_free_through_fn_ptr` in
   /// clang/test/Analysis/NewDeleteLeaks.cpp.
   bool isFreeingCallAsWritten(const CallExpr &Call) const {
-    if (Checker.FreeingMemFnMap.lookupAsWritten(Call) ||
-        Checker.ReallocatingMemFnMap.lookupAsWritten(Call))
+    const auto *MallocChk = static_cast<const MallocChecker *>(&Checker);
+    if (MallocChk->FreeingMemFnMap.lookupAsWritten(Call) ||
+        MallocChk->ReallocatingMemFnMap.lookupAsWritten(Call))
       return true;
 
     if (const auto *Func =
@@ -839,23 +786,21 @@ class NoOwnershipChangeVisitor final : public NoStateChangeFuncVisitor {
     return false;
   }
 
+  bool hasResourceStateChanged(ProgramStateRef CallEnterState,
+                               ProgramStateRef CallExitEndState) final {
+    return CallEnterState->get<RegionState>(Sym) !=
+           CallExitEndState->get<RegionState>(Sym);
+  }
+
   /// Heuristically guess whether the callee intended to free memory. This is
   /// done syntactically, because we are trying to argue about alternative
   /// paths of execution, and as a consequence we don't have path-sensitive
   /// information.
-  bool doesFnIntendToHandleOwnership(const Decl *Callee, ASTContext &ACtx) {
+  bool doesFnIntendToHandleOwnership(const Decl *Callee,
+                                     ASTContext &ACtx) final {
     using namespace clang::ast_matchers;
     const FunctionDecl *FD = dyn_cast<FunctionDecl>(Callee);
 
-    // Given that the stack frame was entered, the body should always be
-    // theoretically obtainable. In case of body farms, the synthesized body
-    // is not attached to declaration, thus triggering the '!FD->hasBody()'
-    // branch. That said, would a synthesized body ever intend to handle
-    // ownership? As of today they don't. And if they did, how would we
-    // put notes inside it, given that it doesn't match any source locations?
-    if (!FD || !FD->hasBody())
-      return false;
-
     auto Matches = match(findAll(stmt(anyOf(cxxDeleteExpr().bind("delete"),
                                             callExpr().bind("call")))),
                          *FD->getBody(), ACtx);
@@ -873,30 +818,7 @@ class NoOwnershipChangeVisitor final : public NoStateChangeFuncVisitor {
     return false;
   }
 
-  bool wasModifiedInFunction(const ExplodedNode *CallEnterN,
-                             const ExplodedNode *CallExitEndN) override {
-    if (!doesFnIntendToHandleOwnership(
-            CallExitEndN->getFirstPred()->getLocationContext()->getDecl(),
-            CallExitEndN->getState()->getAnalysisManager().getASTContext()))
-      return true;
-
-    if (CallEnterN->getState()->get<RegionState>(Sym) !=
-        CallExitEndN->getState()->get<RegionState>(Sym))
-      return true;
-
-    OwnerSet CurrOwners = getOwnersAtNode(CallEnterN);
-    OwnerSet ExitOwners = getOwnersAtNode(CallExitEndN);
-
-    // Owners in the current set may be purged from the analyzer later on.
-    // If a variable is dead (is not referenced directly or indirectly after
-    // some point), it will be removed from the Store before the end of its
-    // actual lifetime.
-    // This means that if the ownership status didn't change, CurrOwners
-    // must be a superset of, but not necessarily equal to ExitOwners.
-    return !llvm::set_is_subset(ExitOwners, CurrOwners);
-  }
-
-  static PathDiagnosticPieceRef emitNote(const ExplodedNode *N) {
+  PathDiagnosticPieceRef emitNote(const ExplodedNode *N) final {
     PathDiagnosticLocation L = PathDiagnosticLocation::create(
         N->getLocation(),
         N->getState()->getStateManager().getContext().getSourceManager());
@@ -905,42 +827,9 @@ class NoOwnershipChangeVisitor final : public NoStateChangeFuncVisitor {
            "later deallocation");
   }
 
-  PathDiagnosticPieceRef
-  maybeEmitNoteForObjCSelf(PathSensitiveBugReport &R,
-                           const ObjCMethodCall &Call,
-                           const ExplodedNode *N) override {
-    // TODO: Implement.
-    return nullptr;
-  }
-
-  PathDiagnosticPieceRef
-  maybeEmitNoteForCXXThis(PathSensitiveBugReport &R,
-                          const CXXConstructorCall &Call,
-                          const ExplodedNode *N) override {
-    // TODO: Implement.
-    return nullptr;
-  }
-
-  PathDiagnosticPieceRef
-  maybeEmitNoteForParameters(PathSensitiveBugReport &R, const CallEvent &Call,
-                             const ExplodedNode *N) override {
-    // TODO: Factor the logic of "what constitutes as an entity being passed
-    // into a function call" out by reusing the code in
-    // NoStoreFuncVisitor::maybeEmitNoteForParameters, maybe by incorporating
-    // the printing technology in UninitializedObject's FieldChainInfo.
-    ArrayRef<ParmVarDecl *> Parameters = Call.parameters();
-    for (unsigned I = 0; I < Call.getNumArgs() && I < Parameters.size(); ++I) {
-      SVal V = Call.getArgSVal(I);
-      if (V.getAsSymbol() == Sym)
-        return emitNote(N);
-    }
-    return nullptr;
-  }
-
 public:
-  NoOwnershipChangeVisitor(SymbolRef Sym, const MallocChecker *Checker)
-      : NoStateChangeFuncVisitor(bugreporter::TrackingKind::Thorough), Sym(Sym),
-        Checker(*Checker) {}
+  NoMemOwnershipChangeVisitor(SymbolRef Sym, const MallocChecker *Checker)
+      : NoOwnershipChangeVisitor(Sym, Checker) {}
 
   void Profile(llvm::FoldingSetNodeID &ID) const override {
     static int Tag = 0;
@@ -2949,7 +2838,7 @@ void MallocChecker::HandleLeak(SymbolRef Sym, ExplodedNode *N,
   R->markInteresting(Sym);
   R->addVisitor<MallocBugVisitor>(Sym, true);
   if (ShouldRegisterNoOwnershipChangeVisitor)
-    R->addVisitor<NoOwnershipChangeVisitor>(Sym, this);
+    R->addVisitor<NoMemOwnershipChangeVisitor>(Sym, this);
   C.emitReport(std::move(R));
 }
 

diff --git a/clang/lib/StaticAnalyzer/Checkers/NoOwnershipChangeVisitor.cpp b/clang/lib/StaticAnalyzer/Checkers/NoOwnershipChangeVisitor.cpp
@@ -0,0 +1,116 @@
+//===--------------------------------------------------------------*- 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 "NoOwnershipChangeVisitor.h"
+#include "clang/StaticAnalyzer/Core/BugReporter/BugReporterVisitors.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/ExplodedGraph.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState_Fwd.h"
+#include "llvm/ADT/SetOperations.h"
+
+using namespace clang;
+using namespace ento;
+using OwnerSet = NoOwnershipChangeVisitor::OwnerSet;
+
+// Collect which entities point to the allocated memory, and could be
+// responsible for deallocating it.
+class OwnershipBindingsHandler : public StoreManager::BindingsHandler {
+  SymbolRef Sym;
+  OwnerSet &Owners;
+
+public:
+  OwnershipBindingsHandler(SymbolRef Sym, OwnerSet &Owners)
+      : Sym(Sym), Owners(Owners) {}
+
+  bool HandleBinding(StoreManager &SMgr, Store Store, const MemRegion *Region,
+                     SVal Val) override {
+    if (Val.getAsSymbol() == Sym)
+      Owners.insert(Region);
+    return true;
+  }
+
+  LLVM_DUMP_METHOD void dump() const { dumpToStream(llvm::errs()); }
+  LLVM_DUMP_METHOD void dumpToStream(llvm::raw_ostream &out) const {
+    out << "Owners: {\n";
+    for (const MemRegion *Owner : Owners) {
+      out << "  ";
+      Owner->dumpToStream(out);
+      out << ",\n";
+    }
+    out << "}\n";
+  }
+};
+
+OwnerSet NoOwnershipChangeVisitor::getOwnersAtNode(const ExplodedNode *N) {
+  OwnerSet Ret;
+
+  ProgramStateRef State = N->getState();
+  OwnershipBindingsHandler Handler{Sym, Ret};
+  State->getStateManager().getStoreManager().iterBindings(State->getStore(),
+                                                          Handler);
+  return Ret;
+}
+
+LLVM_DUMP_METHOD std::string
+NoOwnershipChangeVisitor::getFunctionName(const ExplodedNode *CallEnterN) {
+  if (const CallExpr *CE = llvm::dyn_cast_or_null<CallExpr>(
+          CallEnterN->getLocationAs<CallEnter>()->getCallExpr()))
+    if (const FunctionDecl *FD = CE->getDirectCallee())
+      return FD->getQualifiedNameAsString();
+  return "";
+}
+
+bool NoOwnershipChangeVisitor::wasModifiedInFunction(
+    const ExplodedNode *CallEnterN, const ExplodedNode *CallExitEndN) {
+  const Decl *Callee =
+      CallExitEndN->getFirstPred()->getLocationContext()->getDecl();
+  const FunctionDecl *FD = dyn_cast<FunctionDecl>(Callee);
+
+  // Given that the stack frame was entered, the body should always be
+  // theoretically obtainable. In case of body farms, the synthesized body
+  // is not attached to declaration, thus triggering the '!FD->hasBody()'
+  // branch. That said, would a synthesized body ever intend to handle
+  // ownership? As of today they don't. And if they did, how would we
+  // put notes inside it, given that it doesn't match any source locations?
+  if (!FD || !FD->hasBody())
+    return false;
+  if (!doesFnIntendToHandleOwnership(
+          Callee,
+          CallExitEndN->getState()->getAnalysisManager().getASTContext()))
+    return true;
+
+  if (hasResourceStateChanged(CallEnterN->getState(), CallExitEndN->getState()))
+    return true;
+
+  OwnerSet CurrOwners = getOwnersAtNode(CallEnterN);
+  OwnerSet ExitOwners = getOwnersAtNode(CallExitEndN);
+
+  // Owners in the current set may be purged from the analyzer later on.
+  // If a variable is dead (is not referenced directly or indirectly after
+  // some point), it will be removed from the Store before the end of its
+  // actual lifetime.
+  // This means that if the ownership status didn't change, CurrOwners
+  // must be a superset of, but not necessarily equal to ExitOwners.
+  return !llvm::set_is_subset(ExitOwners, CurrOwners);
+}
+
+PathDiagnosticPieceRef NoOwnershipChangeVisitor::maybeEmitNoteForParameters(
+    PathSensitiveBugReport &R, const CallEvent &Call, const ExplodedNode *N) {
+  // TODO: Factor the logic of "what constitutes as an entity being passed
+  // into a function call" out by reusing the code in
+  // NoStoreFuncVisitor::maybeEmitNoteForParameters, maybe by incorporating
+  // the printing technology in UninitializedObject's FieldChainInfo.
+  ArrayRef<ParmVarDecl *> Parameters = Call.parameters();
+  for (unsigned I = 0; I < Call.getNumArgs() && I < Parameters.size(); ++I) {
+    SVal V = Call.getArgSVal(I);
+    if (V.getAsSymbol() == Sym)
+      return emitNote(N);
+  }
+  return nullptr;
+}
diff --git a/clang/lib/StaticAnalyzer/Checkers/NoOwnershipChangeVisitor.h b/clang/lib/StaticAnalyzer/Checkers/NoOwnershipChangeVisitor.h
@@ -0,0 +1,77 @@
+//===--------------------------------------------------------------*- 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 "clang/StaticAnalyzer/Core/BugReporter/BugReporterVisitors.h"
+#include "clang/StaticAnalyzer/Core/Checker.h"
+#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState_Fwd.h"
+
+namespace clang {
+namespace ento {
+
+class NoOwnershipChangeVisitor : public NoStateChangeFuncVisitor {
+protected:
+  // The symbol whose (lack of) ownership change we are interested in.
+  SymbolRef Sym;
+  const CheckerBase &Checker;
+
+  LLVM_DUMP_METHOD static std::string
+  getFunctionName(const ExplodedNode *CallEnterN);
+
+  /// Heuristically guess whether the callee intended to free the resource. This
+  /// is done syntactically, because we are trying to argue about alternative
+  /// paths of execution, and as a consequence we don't have path-sensitive
+  /// information.
+  virtual bool doesFnIntendToHandleOwnership(const Decl *Callee,
+                                             ASTContext &ACtx) = 0;
+
+  virtual bool hasResourceStateChanged(ProgramStateRef CallEnterState,
+                                       ProgramStateRef CallExitEndState) = 0;
+
+  bool wasModifiedInFunction(const ExplodedNode *CallEnterN,
+                             const ExplodedNode *CallExitEndN) final;
+
+  virtual PathDiagnosticPieceRef emitNote(const ExplodedNode *N) = 0;
+
+  PathDiagnosticPieceRef maybeEmitNoteForObjCSelf(PathSensitiveBugReport &R,
+                                                  const ObjCMethodCall &Call,
+                                                  const ExplodedNode *N) final {
+    // TODO: Implement.
+    return nullptr;
+  }
+
+  PathDiagnosticPieceRef maybeEmitNoteForCXXThis(PathSensitiveBugReport &R,
+                                                 const CXXConstructorCall &Call,
+                                                 const ExplodedNode *N) final {
+    // TODO: Implement.
+    return nullptr;
+  }
+
+  // Set this to final, effectively dispatch to emitNote.
+  PathDiagnosticPieceRef
+  maybeEmitNoteForParameters(PathSensitiveBugReport &R, const CallEvent &Call,
+                             const ExplodedNode *N) final;
+
+public:
+  using OwnerSet = llvm::SmallPtrSet<const MemRegion *, 8>;
+
+private:
+  OwnerSet getOwnersAtNode(const ExplodedNode *N);
+
+public:
+  NoOwnershipChangeVisitor(SymbolRef Sym, const CheckerBase *Checker)
+      : NoStateChangeFuncVisitor(bugreporter::TrackingKind::Thorough), Sym(Sym),
+        Checker(*Checker) {}
+
+  void Profile(llvm::FoldingSetNodeID &ID) const override {
+    static int Tag = 0;
+    ID.AddPointer(&Tag);
+    ID.AddPointer(Sym);
+  }
+};
+} // namespace ento
+} // namespace clang
diff --git a/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp b/clang/lib/StaticAnalyzer/Core/ExprEngine.cpp
@@ -1971,45 +1971,33 @@ void ExprEngine::Visit(const Stmt *S, ExplodedNode *Pred,
       ExplodedNodeSet Tmp;
       StmtNodeBuilder Bldr2(PreVisit, Tmp, *currBldrCtx);
 
-      bool HasRewrittenInit = false;
-      const Expr *ArgE = nullptr;
-      if (const auto *DefE = dyn_cast<CXXDefaultArgExpr>(S)) {
+      const Expr *ArgE;
+      if (const auto *DefE = dyn_cast<CXXDefaultArgExpr>(S))
         ArgE = DefE->getExpr();
-        HasRewrittenInit = DefE->hasRewrittenInit();
-      } else if (const auto *DefE = dyn_cast<CXXDefaultInitExpr>(S)) {
+      else if (const auto *DefE = dyn_cast<CXXDefaultInitExpr>(S))
         ArgE = DefE->getExpr();
-        HasRewrittenInit = DefE->hasRewrittenInit();
-      } else
+      else
         llvm_unreachable("unknown constant wrapper kind");
 
-      if (HasRewrittenInit) {
-        for (auto *N : PreVisit) {
-          ProgramStateRef state = N->getState();
-          const LocationContext *LCtx = N->getLocationContext();
-          state = state->BindExpr(S, LCtx, state->getSVal(ArgE, LCtx));
-          Bldr2.generateNode(S, N, state);
-        }
-      } else {
-        // If it's not rewritten, the contents of these expressions are not
-        // actually part of the current function, so we fall back to constant
-        // evaluation.
-        bool IsTemporary = false;
-        if (const auto *MTE = dyn_cast<MaterializeTemporaryExpr>(ArgE)) {
-          ArgE = MTE->getSubExpr();
-          IsTemporary = true;
-        }
-
-        std::optional<SVal> ConstantVal = svalBuilder.getConstantVal(ArgE);
-        const LocationContext *LCtx = Pred->getLocationContext();
-        for (auto *I : PreVisit) {
-          ProgramStateRef State = I->getState();
-          State = State->BindExpr(S, LCtx, ConstantVal.value_or(UnknownVal()));
-          if (IsTemporary)
-            State = createTemporaryRegionIfNeeded(State, LCtx, cast<Expr>(S),
-                                                  cast<Expr>(S));
+      bool IsTemporary = false;
+      if (const auto *MTE = dyn_cast<MaterializeTemporaryExpr>(ArgE)) {
+        ArgE = MTE->getSubExpr();
+        IsTemporary = true;
+      }
 
-          Bldr2.generateNode(S, I, State);
-        }
+      std::optional<SVal> ConstantVal = svalBuilder.getConstantVal(ArgE);
+      if (!ConstantVal)
+        ConstantVal = UnknownVal();
+
+      const LocationContext *LCtx = Pred->getLocationContext();
+      for (const auto I : PreVisit) {
+        ProgramStateRef State = I->getState();
+        State = State->BindExpr(S, LCtx, *ConstantVal);
+        if (IsTemporary)
+          State = createTemporaryRegionIfNeeded(State, LCtx,
+                                                cast<Expr>(S),
+                                                cast<Expr>(S));
+        Bldr2.generateNode(S, I, State);
       }
 
       getCheckerManager().runCheckersForPostStmt(Dst, Tmp, S, *this);

diff --git a/clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp b/clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp
@@ -42,7 +42,7 @@ DependencyScanningWorkerFilesystem::readFile(StringRef Filename) {
 }
 
 bool DependencyScanningWorkerFilesystem::ensureDirectiveTokensArePopulated(
-    EntryRef Ref, const LangOptions &LangOpts) {
+    EntryRef Ref) {
   auto &Entry = Ref.Entry;
 
   if (Entry.isError() || Entry.isDirectory())
@@ -66,7 +66,7 @@ bool DependencyScanningWorkerFilesystem::ensureDirectiveTokensArePopulated(
   // dependencies.
   if (scanSourceForDependencyDirectives(Contents->Original->getBuffer(),
                                         Contents->DepDirectiveTokens,
-                                        Directives, LangOpts)) {
+                                        Directives)) {
     Contents->DepDirectiveTokens.clear();
     // FIXME: Propagate the diagnostic if desired by the client.
     Contents->DepDirectives.store(new std::optional<DependencyDirectivesTy>());

diff --git a/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp b/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
@@ -364,12 +364,11 @@ class DependencyScanningAction : public tooling::ToolAction {
     // Use the dependency scanning optimized file system if requested to do so.
     if (DepFS)
       ScanInstance.getPreprocessorOpts().DependencyDirectivesForFile =
-          [LocalDepFS = DepFS,
-           &LangOpts = ScanInstance.getLangOpts()](FileEntryRef File)
+          [LocalDepFS = DepFS](FileEntryRef File)
           -> std::optional<ArrayRef<dependency_directives_scan::Directive>> {
         if (llvm::ErrorOr<EntryRef> Entry =
                 LocalDepFS->getOrCreateFileSystemEntry(File.getName()))
-          if (LocalDepFS->ensureDirectiveTokensArePopulated(*Entry, LangOpts))
+          if (LocalDepFS->ensureDirectiveTokensArePopulated(*Entry))
             return Entry->getDirectiveTokens();
         return std::nullopt;
       };

diff --git a/clang/lib/Tooling/Syntax/Tokens.cpp b/clang/lib/Tooling/Syntax/Tokens.cpp
@@ -383,12 +383,13 @@ llvm::ArrayRef<syntax::Token> TokenBuffer::spelledTokens(FileID FID) const {
   return It->second.SpelledTokens;
 }
 
-const syntax::Token *TokenBuffer::spelledTokenAt(SourceLocation Loc) const {
+const syntax::Token *
+TokenBuffer::spelledTokenContaining(SourceLocation Loc) const {
   assert(Loc.isFileID());
   const auto *Tok = llvm::partition_point(
       spelledTokens(SourceMgr->getFileID(Loc)),
-      [&](const syntax::Token &Tok) { return Tok.location() < Loc; });
-  if (!Tok || Tok->location() != Loc)
+      [&](const syntax::Token &Tok) { return Tok.endLocation() <= Loc; });
+  if (!Tok || Loc < Tok->location())
     return nullptr;
   return Tok;
 }

diff --git a/clang/test/AST/Interp/arrays.cpp b/clang/test/AST/Interp/arrays.cpp
@@ -609,3 +609,17 @@ namespace ArrayMemberAccess {
     bool cond = a->x;
   }
 }
+
+namespace OnePastEndSub {
+  struct A {};
+  constexpr A a[3][3];
+  constexpr int diff2 = &a[1][3] - &a[1][0]; /// Used to crash.
+}
+
+static int same_entity_2[3];
+constexpr int *get2() {
+  // This is a redeclaration of the same entity, even though it doesn't
+  // inherit the type of the prior declaration.
+  extern int same_entity_2[];
+  return same_entity_2;
+}
diff --git a/clang/test/AST/Interp/cxx20.cpp b/clang/test/AST/Interp/cxx20.cpp
@@ -774,3 +774,43 @@ void overflowInSwitchCase(int n) {
     break;
   }
 }
+
+namespace APValues {
+  int g;
+  struct A { union { int n, m; }; int *p; int A::*q; char buffer[32]; };
+  template<A a> constexpr const A &get = a;
+  constexpr const A &v = get<A{}>;
+  constexpr const A &w = get<A{1, &g, &A::n, "hello"}>;
+}
+
+namespace self_referencing {
+  struct S {
+    S* ptr = nullptr;
+    constexpr S(int i) : ptr(this) {
+      if (this == ptr && i)
+        ptr = nullptr;
+    }
+    constexpr ~S() {}
+  };
+
+  void test() {
+    S s(1);
+  }
+}
+
+namespace GH64949 {
+  struct f {
+    int g; // both-note {{subobject declared here}}
+    constexpr ~f() {}
+  };
+
+  class h {
+  public:
+    consteval h(char *) {}
+    f i;
+  };
+
+  void test() { h{nullptr}; } // both-error {{call to consteval function 'GH64949::h::h' is not a constant expression}} \
+                              // both-note {{subobject 'g' is not initialized}} \
+                              // both-warning {{expression result unused}}
+}
diff --git a/clang/test/AST/Interp/cxx23.cpp b/clang/test/AST/Interp/cxx23.cpp
@@ -178,3 +178,25 @@ namespace ExplicitLambdaThis {
   };
   static_assert(f());
 }
+
+namespace std {
+  struct strong_ordering {
+    int n;
+    constexpr operator int() const { return n; }
+    static const strong_ordering less, equal, greater;
+  };
+  constexpr strong_ordering strong_ordering::less = {-1};
+  constexpr strong_ordering strong_ordering::equal = {0};
+  constexpr strong_ordering strong_ordering::greater = {1};
+}
+
+namespace UndefinedThreeWay {
+  struct A {
+    friend constexpr std::strong_ordering operator<=>(const A&, const A&) = default; // all-note {{declared here}}
+  };
+
+  constexpr std::strong_ordering operator<=>(const A&, const A&) noexcept;
+  constexpr std::strong_ordering (*test_a_threeway)(const A&, const A&) = &operator<=>;
+  static_assert(!(*test_a_threeway)(A(), A())); // all-error {{static assertion expression is not an integral constant expression}} \
+                                                // all-note {{undefined function 'operator<=>' cannot be used in a constant expression}}
+}
diff --git a/clang/test/AST/Interp/eval-order.cpp b/clang/test/AST/Interp/eval-order.cpp
@@ -71,8 +71,8 @@ namespace EvalOrder {
   // Rules 1 and 2 have no effect ('b' is not an expression).
 
   // Rule 3: a->*b
-  // SEQ(A(ud).*B(&UserDefined::n)); FIXME
-  // SEQ(A(&ud)->*B(&UserDefined::n)); FIXME
+  SEQ(A(ud).*B(&UserDefined::n));
+  SEQ(A(&ud)->*B(&UserDefined::n));
 
   // Rule 4: a(b1, b2, b3)
   SEQ(A(f)(B(1), B(2), B(3))); // expected-error {{not an integral constant expression}} FIXME \

diff --git a/clang/test/AST/Interp/lambda.cpp b/clang/test/AST/Interp/lambda.cpp
@@ -264,3 +264,19 @@ namespace CaptureDefaults {
   };
   static_assert(f2() == 3, "");
 }
+
+constexpr auto t4 = ([x=42]() consteval { return x; }());
+static_assert(t4 == 42, "");
+
+namespace InvalidCapture {
+
+  int &f(int *p);
+  char &f(...);
+  void g() {
+    int n = -1;   // both-note {{declared here}}
+    [=] {
+      int arr[n]; // both-warning {{variable length arrays in C++ are a Clang extension}} \
+                     both-note {{read of non-const variable 'n' is not allowed in a constant expression}}
+    } ();
+  }
+}
diff --git a/clang/test/AST/Interp/literals.cpp b/clang/test/AST/Interp/literals.cpp
@@ -66,7 +66,12 @@ namespace ScalarTypes {
     First = 0,
   };
   static_assert(getScalar<E>() == First, "");
-  /// FIXME: Member pointers.
+
+  struct S {
+    int v;
+  };
+  constexpr int S::* MemberPtr = &S::v;
+  static_assert(getScalar<decltype(MemberPtr)>() == nullptr, "");
 
 #if __cplusplus >= 201402L
   constexpr void Void(int n) {
@@ -1204,7 +1209,7 @@ namespace incdecbool {
 constexpr int externvar1() { // both-error {{never produces a constant expression}}
   extern char arr[]; // ref-note {{declared here}}
    return arr[0]; // ref-note {{read of non-constexpr variable 'arr'}} \
-                  // expected-note {{array-to-pointer decay of array member without known bound is not supported}}
+                  // expected-note {{indexing of array without known bound}}
 }
 #endif
 

diff --git a/clang/test/AST/Interp/memberpointers.cpp b/clang/test/AST/Interp/memberpointers.cpp
@@ -0,0 +1,197 @@
+// RUN: %clang_cc1 -std=c++14 -fexperimental-new-constant-interpreter -verify=expected,both %s
+// RUN: %clang_cc1 -std=c++14 -verify=ref,both %s
+
+namespace MemberPointers {
+  struct A {
+    constexpr A(int n) : n(n) {}
+    int n;
+    constexpr int f() const { return n + 3; }
+  };
+
+  constexpr A a(7);
+  static_assert(A(5).*&A::n == 5, "");
+  static_assert((&a)->*&A::n == 7, "");
+  static_assert((A(8).*&A::f)() == 11, "");
+  static_assert(((&a)->*&A::f)() == 10, "");
+
+  struct B : A {
+    constexpr B(int n, int m) : A(n), m(m) {}
+    int m;
+    constexpr int g() const { return n + m + 1; }
+  };
+  constexpr B b(9, 13);
+  static_assert(B(4, 11).*&A::n == 4, "");
+  static_assert(B(4, 11).*&B::m == 11, "");
+  static_assert(B(4, 11).m == 11, "");
+  static_assert(B(4, 11).*(int(A::*))&B::m == 11, "");
+  static_assert(B(4, 11).*&B::m == 11, "");
+  static_assert((&b)->*&A::n == 9, "");
+  static_assert((&b)->*&B::m == 13, "");
+  static_assert((&b)->*(int(A::*))&B::m == 13, "");
+  static_assert((B(4, 11).*&A::f)() == 7, "");
+  static_assert((B(4, 11).*&B::g)() == 16, "");
+
+  static_assert((B(4, 11).*(int(A::*)() const)&B::g)() == 16, "");
+
+  static_assert(((&b)->*&A::f)() == 12, "");
+  static_assert(((&b)->*&B::g)() == 23, "");
+  static_assert(((&b)->*(int(A::*)()const)&B::g)() == 23, "");
+
+
+  struct S {
+    constexpr S(int m, int n, int (S::*pf)() const, int S::*pn) :
+      m(m), n(n), pf(pf), pn(pn) {}
+    constexpr S() : m(), n(), pf(&S::f), pn(&S::n) {}
+
+    constexpr int f() const { return this->*pn; }
+    virtual int g() const;
+
+    int m, n;
+    int (S::*pf)() const;
+    int S::*pn;
+  };
+
+  constexpr int S::*pm = &S::m;
+  constexpr int S::*pn = &S::n;
+
+  constexpr int (S::*pf)() const = &S::f;
+  constexpr int (S::*pg)() const = &S::g;
+
+  constexpr S s(2, 5, &S::f, &S::m);
+
+  static_assert((s.*&S::f)() == 2, "");
+  static_assert((s.*s.pf)() == 2, "");
+
+  static_assert(pf == &S::f, "");
+
+  static_assert(pf == s.*&S::pf, "");
+
+  static_assert(pm == &S::m, "");
+  static_assert(pm != pn, "");
+  static_assert(s.pn != pn, "");
+  static_assert(s.pn == pm, "");
+  static_assert(pg != nullptr, "");
+  static_assert(pf != nullptr, "");
+  static_assert((int S::*)nullptr == nullptr, "");
+  static_assert(pg == pg, ""); // both-error {{constant expression}} \
+                               // both-note {{comparison of pointer to virtual member function 'g' has unspecified value}}
+  static_assert(pf != pg, ""); // both-error {{constant expression}} \
+                               // both-note {{comparison of pointer to virtual member function 'g' has unspecified value}}
+
+  template<int n> struct T : T<n-1> { const int X = n;};
+  template<> struct T<0> { int n; char k;};
+  template<> struct T<30> : T<29> { int m; };
+
+  T<17> t17;
+  T<30> t30;
+
+  constexpr int (T<15>::*deepm) = (int(T<10>::*))&T<30>::m;
+  constexpr int (T<10>::*deepn) = &T<0>::n;
+  constexpr char (T<10>::*deepk) = &T<0>::k;
+
+  static_assert(&(t17.*deepn) == &t17.n, "");
+  static_assert(&(t17.*deepk) == &t17.k, "");
+  static_assert(deepn == &T<2>::n, "");
+
+  constexpr int *pgood = &(t30.*deepm);
+  constexpr int *pbad = &(t17.*deepm); // both-error {{constant expression}}
+  static_assert(&(t30.*deepm) == &t30.m, "");
+
+  static_assert(deepm == &T<50>::m, "");
+  static_assert(deepm != deepn, "");
+
+  constexpr T<5> *p17_5 = &t17;
+  constexpr T<13> *p17_13 = (T<13>*)p17_5;
+  constexpr T<23> *p17_23 = (T<23>*)p17_13; // both-error {{constant expression}} \
+                                            // both-note {{cannot cast object of dynamic type 'T<17>' to type 'T<23>'}}
+  constexpr T<18> *p17_18 = (T<18>*)p17_13; // both-error {{constant expression}} \
+                                            // both-note {{cannot cast object of dynamic type 'T<17>' to type 'T<18>'}}
+  static_assert(&(p17_5->*(int(T<0>::*))deepn) == &t17.n, "");
+  static_assert(&(p17_5->*(int(T<0>::*))deepn), "");
+
+
+  static_assert(&(p17_13->*deepn) == &t17.n, "");
+  constexpr int *pbad2 = &(p17_13->*(int(T<9>::*))deepm); // both-error {{constant expression}}
+
+  constexpr T<5> *p30_5 = &t30;
+  constexpr T<23> *p30_23 = (T<23>*)p30_5;
+  constexpr T<13> *p30_13 = p30_23;
+  static_assert(&(p30_13->*deepn) == &t30.n, "");
+  static_assert(&(p30_23->*deepn) == &t30.n, "");
+  static_assert(&(p30_5->*(int(T<3>::*))deepn) == &t30.n, "");
+
+  static_assert(&(p30_5->*(int(T<2>::*))deepm) == &t30.m, "");
+  static_assert(&(((T<17>*)p30_13)->*deepm) == &t30.m, "");
+  static_assert(&(p30_23->*deepm) == &t30.m, "");
+
+
+  /// Added tests not from constant-expression-cxx11.cpp
+  static_assert(pm, "");
+  static_assert(!((int S::*)nullptr), "");
+  constexpr int S::*pk = nullptr;
+  static_assert(!pk, "");
+}
+
+namespace test3 {
+  struct nsCSSRect {
+  };
+  static int nsCSSRect::* sides;
+  nsCSSRect dimenX;
+  void ParseBoxCornerRadii(int y) {
+    switch (y) {
+    }
+    int& x = dimenX.*sides;
+  }
+}
+
+void foo() {
+  class X;
+  void (X::*d) ();
+  d = nullptr; /// This calls in the constant interpreter.
+}
+
+namespace {
+  struct A { int n; };
+  struct B { int n; };
+  struct C : A, B {};
+  struct D { double d; C c; };
+  const int &&u = static_cast<B&&>(0, ((D&&)D{}).*&D::c).n; // both-warning {{left operand of comma operator has no effect}}
+}
+
+/// From SemaTemplate/instantiate-member-pointers.cpp
+namespace {
+  struct Y {
+    int x;
+  };
+
+  template<typename T, typename Class, T Class::*Ptr>
+  struct X3 {
+    X3<T, Class, Ptr> &operator=(const T& value) {
+      return *this;
+    }
+  };
+
+  typedef int Y::*IntMember;
+  template<IntMember Member>
+  struct X4 {
+    X3<int, Y, Member> member;
+    int &getMember(Y& y) { return y.*Member; }
+  };
+
+  int &get_X4(X4<&Y::x> x4, Y& y) {
+    return x4.getMember(y);
+  }
+}
+
+/// From test/CXX/basic/basic.def.odr/p2.cpp
+namespace {
+  void use(int);
+  struct S { int x; int f() const; };
+  constexpr S *ps = nullptr;
+  S *const &psr = ps;
+
+  void test() {
+    use(ps->*&S::x);
+    use(psr->*&S::x);
+  }
+}
diff --git a/clang/test/AST/ast-dump-default-init-json.cpp b/clang/test/AST/ast-dump-default-init-json.cpp
@@ -789,10 +789,10 @@ void test() {
 // CHECK-NEXT:                  "valueCategory": "lvalue",
 // CHECK-NEXT:                  "extendingDecl": {
 // CHECK-NEXT:                   "id": "0x{{.*}}",
-// CHECK-NEXT:                   "kind": "VarDecl",
-// CHECK-NEXT:                   "name": "b",
+// CHECK-NEXT:                   "kind": "FieldDecl",
+// CHECK-NEXT:                   "name": "a",
 // CHECK-NEXT:                   "type": {
-// CHECK-NEXT:                    "qualType": "B"
+// CHECK-NEXT:                    "qualType": "const A &"
 // CHECK-NEXT:                   }
 // CHECK-NEXT:                  },
 // CHECK-NEXT:                  "storageDuration": "automatic",

diff --git a/clang/test/AST/ast-dump-default-init.cpp b/clang/test/AST/ast-dump-default-init.cpp
@@ -13,7 +13,7 @@ void test() {
 }
 // CHECK: -CXXDefaultInitExpr 0x{{[^ ]*}} <{{.*}}> 'const A' lvalue has rewritten init
 // CHECK-NEXT:  `-ExprWithCleanups 0x{{[^ ]*}} <{{.*}}> 'const A' lvalue
-// CHECK-NEXT:    `-MaterializeTemporaryExpr 0x{{[^ ]*}} <{{.*}}> 'const A' lvalue extended by Var 0x{{[^ ]*}} 'b' 'B'
+// CHECK-NEXT:    `-MaterializeTemporaryExpr 0x{{[^ ]*}} <{{.*}}> 'const A' lvalue extended by Field 0x{{[^ ]*}} 'a' 'const A &'
 // CHECK-NEXT:      `-ImplicitCastExpr 0x{{[^ ]*}} <{{.*}}> 'const A' <NoOp>
 // CHECK-NEXT:        `-CXXFunctionalCastExpr 0x{{[^ ]*}} <{{.*}}> 'A' functional cast to A <NoOp>
 // CHECK-NEXT:          `-InitListExpr 0x{{[^ ]*}} <{{.*}}> 'A'

diff --git a/clang/test/Analysis/cxx-uninitialized-object.cpp b/clang/test/Analysis/cxx-uninitialized-object.cpp
@@ -1114,27 +1114,27 @@ void fCXX11MemberInitTest1() {
   CXX11MemberInitTest1();
 }
 
-#ifdef PEDANTIC
 struct CXX11MemberInitTest2 {
   struct RecordType {
-    int a; // expected-note {{uninitialized field 'this->a'}}
-    int b; // expected-note {{uninitialized field 'this->b'}}
+    // TODO: we'd expect the note: {{uninitialized field 'this->rec.a'}}
+    int a; // no-note
+    // TODO: we'd expect the note: {{uninitialized field 'this->rec.b'}}
+    int b; // no-note
 
     RecordType(int) {}
   };
 
-  RecordType rec = RecordType(int()); // expected-warning {{2 uninitialized fields}}
+  RecordType rec = RecordType(int());
   int dontGetFilteredByNonPedanticMode = 0;
 
   CXX11MemberInitTest2() {}
 };
 
 void fCXX11MemberInitTest2() {
+  // TODO: we'd expect the warning: {{2 uninitializeds field}}
   CXX11MemberInitTest2(); // no-warning
 }
 
-#endif // PEDANTIC
-
 //===----------------------------------------------------------------------===//
 // "Esoteric" primitive type tests.
 //===----------------------------------------------------------------------===//

diff --git a/clang/test/Analysis/lifetime-extended-regions.cpp b/clang/test/Analysis/lifetime-extended-regions.cpp
@@ -120,11 +120,11 @@ void aggregateWithReferences() {
   clang_analyzer_dump(viaReference);    // expected-warning-re {{&lifetime_extended_object{RefAggregate, viaReference, S{{[0-9]+}}} }}
   clang_analyzer_dump(viaReference.rx); // expected-warning-re {{&lifetime_extended_object{int, viaReference, S{{[0-9]+}}} }}
   clang_analyzer_dump(viaReference.ry); // expected-warning-re {{&lifetime_extended_object{Composite, viaReference, S{{[0-9]+}}} }}
-  
-  // The lifetime lifetime of object bound to reference members of aggregates,
-  // that are created from default member initializer was extended.
-  RefAggregate defaultInitExtended{i};
-  clang_analyzer_dump(defaultInitExtended.ry); // expected-warning-re {{&lifetime_extended_object{Composite, defaultInitExtended, S{{[0-9]+}}} }}
+
+  // clang does not currently implement extending lifetime of object bound to reference members of aggregates,
+  // that are created from default member initializer (see `warn_unsupported_lifetime_extension` from `-Wdangling`)
+  RefAggregate defaultInitExtended{i}; // clang-bug does not extend `Composite`
+  clang_analyzer_dump(defaultInitExtended.ry); // expected-warning {{Unknown }}
 }
 
 void lambda() {

diff --git a/clang/test/CXX/drs/cwg16xx.cpp b/clang/test/CXX/drs/cwg16xx.cpp
@@ -483,6 +483,8 @@ namespace cwg1696 { // cwg1696: 7
     const A &a = A(); // #cwg1696-D1-a
   };
   D1 d1 = {}; // #cwg1696-d1
+  // since-cxx14-warning@-1 {{lifetime extension of temporary created by aggregate initialization using a default member initializer is not yet supported; lifetime of temporary will end at the end of the full-expression}}
+  //   since-cxx14-note@#cwg1696-D1-a {{initializing field 'a' with default member initializer}}
 
   struct D2 {
     const A &a = A(); // #cwg1696-D2-a

diff --git a/clang/test/CXX/drs/cwg18xx.cpp b/clang/test/CXX/drs/cwg18xx.cpp
@@ -206,28 +206,19 @@ namespace cwg1814 { // cwg1814: yes
 #endif
 }
 
-namespace cwg1815 { // cwg1815: 19
+namespace cwg1815 { // cwg1815: no
 #if __cplusplus >= 201402L
-  struct A { int &&r = 0; };
+  // FIXME: needs codegen test
+  struct A { int &&r = 0; }; // #cwg1815-A
   A a = {};
+  // since-cxx14-warning@-1 {{lifetime extension of temporary created by aggregate initialization using a default member initializer is not yet supported; lifetime of temporary will end at the end of the full-expression}} FIXME
+  //   since-cxx14-note@#cwg1815-A {{initializing field 'r' with default member initializer}}
 
   struct B { int &&r = 0; }; // #cwg1815-B
   // since-cxx14-error@-1 {{reference member 'r' binds to a temporary object whose lifetime would be shorter than the lifetime of the constructed object}}
   //   since-cxx14-note@#cwg1815-B {{initializing field 'r' with default member initializer}}
   //   since-cxx14-note@#cwg1815-b {{in implicit default constructor for 'cwg1815::B' first required here}}
   B b; // #cwg1815-b
-
-#if __cplusplus >= 201703L
-  struct C { const int &r = 0; };
-  constexpr C c = {}; // OK, since cwg1815
-  static_assert(c.r == 0);
-
-  constexpr int f() {
-    A a = {}; // OK, since cwg1815
-    return a.r;
-  }
-  static_assert(f() == 0);
-#endif
 #endif
 }
 

diff --git a/clang/test/CXX/special/class.temporary/p6.cpp b/clang/test/CXX/special/class.temporary/p6.cpp
@@ -269,40 +269,6 @@ void init_capture_init_list() {
   // CHECK: }
 }
 
-void check_dr1815() { // dr1815: yes
-#if __cplusplus >= 201402L
-
-  struct A {
-    int &&r = 0;
-    ~A() {}
-  };
-
-  struct B {
-    A &&a = A{};
-    ~B() {}
-  };
-  B a = {};
-
-  // CHECK: call {{.*}}block_scope_begin_function
-  extern void block_scope_begin_function();
-  extern void block_scope_end_function();
-  block_scope_begin_function();
-  {
-    // CHECK: call void @_ZZ12check_dr1815vEN1BD1Ev
-    // CHECK: call void @_ZZ12check_dr1815vEN1AD1Ev
-    B b = {};
-  }
-  // CHECK: call {{.*}}block_scope_end_function
-  block_scope_end_function();
-
-  // CHECK: call {{.*}}some_other_function
-  extern void some_other_function();
-  some_other_function();
-  // CHECK: call void @_ZZ12check_dr1815vEN1BD1Ev
-  // CHECK: call void @_ZZ12check_dr1815vEN1AD1Ev
-#endif
-}
-
 namespace P2718R0 {
 namespace basic {
 template <typename E> using T2 = std::list<E>;