Fix CI issues in the 5.3 branch

include/swift/AST/Decl.h

@@ -3594,6 +3594,8 @@ class NominalTypeDecl : public GenericTypeDecl, public IterableDeclContext {
   /// initializer.
   bool hasDefaultInitializer() const;
 
+  bool isTypeErasedGenericClass() const;
+
   /// Retrieves the synthesized zero parameter default initializer for this
   /// declaration, or \c nullptr if it doesn't have one.
   ConstructorDecl *getDefaultInitializer() const;

include/swift/AST/DiagnosticsSema.def

@@ -1174,6 +1174,12 @@ ERROR(extra_trailing_closure_in_call,none,
 ERROR(trailing_closure_bad_param,none,
       "trailing closure passed to parameter of type %0 that does not "
       "accept a closure", (Type))
+WARNING(unlabeled_trailing_closure_deprecated,none,
+        "backward matching of the unlabeled trailing closure is deprecated; label the argument with %0 to suppress this warning",
+        (Identifier))
+NOTE(decl_multiple_defaulted_closure_parameters,none,
+     "%0 contains defaulted closure parameters %1 and %2",
+     (DeclName, Identifier, Identifier))
 NOTE(candidate_with_extraneous_args,none,
       "candidate %0 requires %1 argument%s1, "
       "but %2 %select{were|was}3 %select{provided|used in closure body}4",
@@ -2678,6 +2684,12 @@ ERROR(decl_from_hidden_module,none,
       "%select{%3 has been imported as implementation-only|"
       "it is an SPI imported from %3}4",
       (DescriptiveDeclKind, DeclName, unsigned, Identifier, unsigned))
+WARNING(decl_from_hidden_module_warn,none,
+      "cannot use %0 %1 %select{in SPI|as property wrapper in SPI|"
+      "in an extension with public or '@usableFromInline' members|"
+      "in an extension with conditional conformances}2; "
+      "%select{%3 has been imported as implementation-only}4",
+      (DescriptiveDeclKind, DeclName, unsigned, Identifier, unsigned))
 ERROR(conformance_from_implementation_only_module,none,
       "cannot use conformance of %0 to %1 %select{here|as property wrapper here|"
       "in an extension with public or '@usableFromInline' members|"

include/swift/AST/Type.h

@@ -389,6 +389,7 @@ class CanType : public Type {
   static bool isExistentialTypeImpl(CanType type);
   static bool isAnyExistentialTypeImpl(CanType type);
   static bool isObjCExistentialTypeImpl(CanType type);
+  static bool isTypeErasedGenericClassTypeImpl(CanType type);
   static CanType getOptionalObjectTypeImpl(CanType type);
   static CanType getReferenceStorageReferentImpl(CanType type);
   static CanType getWithoutSpecifierTypeImpl(CanType type);
@@ -475,6 +476,11 @@ class CanType : public Type {
     return isObjCExistentialTypeImpl(*this);
   }
 
+  // Is this an ObjC generic class.
+  bool isTypeErasedGenericClassType() const {
+    return isTypeErasedGenericClassTypeImpl(*this);
+  }
+
   ClassDecl *getClassOrBoundGenericClass() const; // in Types.h
   StructDecl *getStructOrBoundGenericStruct() const; // in Types.h
   EnumDecl *getEnumOrBoundGenericEnum() const; // in Types.h

include/swift/AST/Types.h

@@ -3484,6 +3484,7 @@ END_CAN_TYPE_WRAPPER(FunctionType, AnyFunctionType)
 /// has a default argument.
 struct ParameterListInfo {
   SmallBitVector defaultArguments;
+  SmallBitVector acceptsUnlabeledTrailingClosures;
 
 public:
   ParameterListInfo() { }
@@ -3494,6 +3495,10 @@ struct ParameterListInfo {
   /// Whether the parameter at the given index has a default argument.
   bool hasDefaultArgument(unsigned paramIdx) const;
 
+  /// Whether the parameter accepts an unlabeled trailing closure argument
+  /// according to the "forward-scan" rule.
+  bool acceptsUnlabeledTrailingClosureArgument(unsigned paramIdx) const;
+
   /// Retrieve the number of non-defaulted parameters.
   unsigned numNonDefaultedParameters() const {
     return defaultArguments.count();

include/swift/Basic/LangOptions.h

@@ -250,6 +250,14 @@ namespace swift {
     /// Build the ASTScope tree lazily
     bool LazyASTScopes = true;
 
+    /// Whether to enable the "fuzzy" forward-scanning behavior for trailing
+    /// closure matching, which skips over defaulted closure parameters
+    /// to match later (non-defaulted) closure parameters
+    ///
+    /// This is a backward-compatibility hack for unlabeled trailing closures,
+    /// to be disabled in Swift 6+.
+    bool EnableFuzzyForwardScanTrailingClosureMatching = true;
+
     /// Use Clang function types for computing canonical types.
     /// If this option is false, the clang function types will still be computed
     /// but will not be used for checking type equality.
@@ -350,6 +358,9 @@ namespace swift {
     /// If set to \c false, fall back to the legacy manual reference name tracking code.
     bool EnableRequestBasedIncrementalDependencies = true;
 
+    /// Load swiftmodule files in memory as volatile and avoid mmap.
+    bool EnableVolatileModules = false;
+
     /// Sets the target we are building for and updates platform conditions
     /// to match.
     ///

include/swift/Basic/Platform.h

@@ -71,11 +71,6 @@ namespace swift {
   /// Returns the platform Kind for Darwin triples.
   DarwinPlatformKind getDarwinPlatformKind(const llvm::Triple &triple);
 
-  /// Maps an arbitrary platform to its non-simulator equivalent.
-  ///
-  /// If \p platform is not a simulator platform, it will be returned as is.
-  DarwinPlatformKind getNonSimulatorPlatform(DarwinPlatformKind platform);
-
   /// Returns the architecture component of the path for a given target triple.
   ///
   /// Typically this is used for mapping the architecture component of the

include/swift/Option/FrontendOptions.td

@@ -455,6 +455,9 @@ def warn_long_expression_type_checking_EQ : Joined<["-"], "warn-long-expression-
 def Rmodule_interface_rebuild : Flag<["-"], "Rmodule-interface-rebuild">,
   HelpText<"Emits a remark if an imported module needs to be re-compiled from its module interface">;
 
+def enable_volatile_modules : Flag<["-"], "enable-volatile-modules">,
+  HelpText<"Load Swift modules in memory">;
+
 def solver_expression_time_threshold_EQ : Joined<["-"], "solver-expression-time-threshold=">;
 
 def solver_disable_shrink :

include/swift/Option/Options.td

@@ -519,6 +519,16 @@ def enable_experimental_concise_pound_file : Flag<["-"],
   Flags<[FrontendOption, ModuleInterfaceOption]>,
   HelpText<"Enable experimental concise '#file' identifier">;
 
+def disable_fuzzy_forward_scan_trailing_closure_matching : Flag<["-"],
+    "disable-fuzzy-forward-scan-trailing-closure-matching">,
+  Flags<[FrontendOption]>,
+  HelpText<"Disable fuzzy forward-scan trailing closure matching">;
+
+def enable_fuzzy_forward_scan_trailing_closure_matching : Flag<["-"],
+    "enable-fuzzy-forward-scan-trailing-closure-matching">,
+  Flags<[FrontendOption]>,
+  HelpText<"Enable fuzzy forward-scan trailing closure matching">;
+
 // Diagnostic control options
 def suppress_warnings : Flag<["-"], "suppress-warnings">,
   Flags<[FrontendOption]>,

include/swift/Runtime/RuntimeFunctions.def

@@ -1172,7 +1172,7 @@ FUNCTION(ConformsToProtocol,
 
 // bool swift_isClassType(type*);
 FUNCTION(IsClassType,
-         swift_isClassType, C_CC, AlwaysAvailable,
+         swift_isClassType, SwiftCC, AlwaysAvailable,
          RETURNS(Int1Ty),
          ARGS(TypeMetadataPtrTy),
          ATTRS(ZExt, NoUnwind, ReadNone))

lib/AST/Decl.cpp

@@ -4190,6 +4190,14 @@ bool NominalTypeDecl::hasDefaultInitializer() const {
                            false);
 }
 
+bool NominalTypeDecl::isTypeErasedGenericClass() const {
+  // ObjC classes are type erased.
+  // TODO: Unless they have magic methods...
+  if (auto clas = dyn_cast<ClassDecl>(this))
+    return clas->hasClangNode() && clas->isGenericContext();
+  return false;
+}
+
 ConstructorDecl *NominalTypeDecl::getDefaultInitializer() const {
   if (!hasDefaultInitializer())
     return nullptr;

lib/AST/Expr.cpp

@@ -1271,15 +1271,29 @@ SourceRange TupleExpr::getSourceRange() const {
       return { SourceLoc(), SourceLoc() };
     } else {
       // Scan backwards for a valid source loc.
+      bool hasSingleTrailingClosure = hasTrailingClosure();
       for (Expr *expr : llvm::reverse(getElements())) {
         // Default arguments are located at the start of their parent tuple, so
         // skip over them.
         if (isa<DefaultArgumentExpr>(expr))
           continue;
-        end = expr->getEndLoc();
-        if (end.isValid()) {
-          break;
+
+        SourceLoc newEnd = expr->getEndLoc();
+        if (newEnd.isInvalid())
+          continue;
+
+        // There is a quirk with the backward scan logic for trailing
+        // closures that can cause arguments to be flipped. If there is a
+        // single trailing closure, only stop when the "end" point we hit comes
+        // after the close parenthesis (if there is one).
+        if (end.isInvalid() ||
+            end.getOpaquePointerValue() < newEnd.getOpaquePointerValue()) {
+          end = newEnd;
         }
+
+        if (!hasSingleTrailingClosure || RParenLoc.isInvalid() ||
+            RParenLoc.getOpaquePointerValue() < end.getOpaquePointerValue())
+          break;
       }
     }
   } else {

lib/AST/Type.cpp

@@ -350,6 +350,12 @@ bool CanType::isObjCExistentialTypeImpl(CanType type) {
   return type.getExistentialLayout().isObjC();
 }
 
+bool CanType::isTypeErasedGenericClassTypeImpl(CanType type) {
+  if (auto nom = type->getAnyNominal())
+    return nom->isTypeErasedGenericClass();
+  return false;
+}
+
 bool TypeBase::isSpecialized() {
   Type t = getCanonicalType();
 
@@ -822,6 +828,32 @@ Type TypeBase::replaceCovariantResultType(Type newResultType,
   return FunctionType::get(inputType, resultType, fnType->getExtInfo());
 }
 
+/// Whether this parameter accepts an unlabeled trailing closure argument
+/// using the more-restrictive forward-scan rule.
+static bool allowsUnlabeledTrailingClosureParameter(const ParamDecl *param) {
+  // inout parameters never allow an unlabeled trailing closure.
+  if (param->isInOut())
+    return false;
+
+  Type paramType = param->isVariadic() ? param->getVarargBaseTy()
+                                       : param->getInterfaceType();
+  paramType = paramType->getRValueType()->lookThroughAllOptionalTypes();
+
+  // For autoclosure parameters, look through the autoclosure result type
+  // to get the actual argument type.
+  if (param->isAutoClosure()) {
+    auto fnType = paramType->getAs<AnyFunctionType>();
+    if (!fnType)
+      return false;
+
+    paramType = fnType->getResult()->lookThroughAllOptionalTypes();
+  }
+
+  // After lookup through all optional types, this parameter allows an
+  // unlabeled trailing closure if it is (structurally) a function type.
+  return paramType->is<AnyFunctionType>();
+}
+
 ParameterListInfo::ParameterListInfo(
     ArrayRef<AnyFunctionType::Param> params,
     const ValueDecl *paramOwner,
@@ -831,7 +863,7 @@ ParameterListInfo::ParameterListInfo(
   // No parameter owner means no parameter list means no default arguments
   // - hand back the zeroed bitvector.
   //
-  // FIXME: We ought to not request default argument info in this case.
+  // FIXME: We ought to not request paramer list info in this case.
   if (!paramOwner)
     return;
 
@@ -865,12 +897,21 @@ ParameterListInfo::ParameterListInfo(
   if (params.size() != paramList->size())
     return;
 
-  // Note which parameters have default arguments and/or function builders.
+  // Now we have enough information to determine which parameters accept
+  // unlabled trailing closures.
+  acceptsUnlabeledTrailingClosures.resize(params.size());
+
+  // Note which parameters have default arguments and/or accept unlabeled
+  // trailing closure arguments with the forward-scan rule.
   for (auto i : range(0, params.size())) {
     auto param = paramList->get(i);
     if (param->isDefaultArgument()) {
       defaultArguments.set(i);
     }
+
+    if (allowsUnlabeledTrailingClosureParameter(param)) {
+      acceptsUnlabeledTrailingClosures.set(i);
+    }
   }
 }
 
@@ -879,6 +920,12 @@ bool ParameterListInfo::hasDefaultArgument(unsigned paramIdx) const {
       : false;
 }
 
+bool ParameterListInfo::acceptsUnlabeledTrailingClosureArgument(
+    unsigned paramIdx) const {
+  return paramIdx >= acceptsUnlabeledTrailingClosures.size() ||
+      acceptsUnlabeledTrailingClosures[paramIdx];
+}
+
 /// Turn a param list into a symbolic and printable representation that does not
 /// include the types, something like (_:, b:, c:)
 std::string swift::getParamListAsString(ArrayRef<AnyFunctionType::Param> params) {
@@ -4261,17 +4308,27 @@ case TypeKind::Id:
   case TypeKind::SILFunction: {
     auto fnTy = cast<SILFunctionType>(base);
     bool changed = false;
-
+    auto hasTypeErasedGenericClassType = [](Type ty) -> bool {
+      return ty.findIf([](Type subType) -> bool {
+        if (subType->getCanonicalType().isTypeErasedGenericClassType())
+          return true;
+        else
+          return false;
+      });
+    };
     auto updateSubs = [&](SubstitutionMap &subs) -> bool {
       // This interface isn't suitable for updating the substitution map in a
       // substituted SILFunctionType.
       // TODO(SILFunctionType): Is it suitable for any SILFunctionType??
       SmallVector<Type, 4> newReplacements;
       for (Type type : subs.getReplacementTypes()) {
         auto transformed = type.transformRec(fn);
-        assert((type->isEqual(transformed)
-                || (type->hasTypeParameter() && transformed->hasTypeParameter()))
-               && "Substituted SILFunctionType can't be transformed into a concrete type");
+        assert((type->isEqual(transformed) ||
+                (type->hasTypeParameter() && transformed->hasTypeParameter()) ||
+                (hasTypeErasedGenericClassType(type) &&
+                 hasTypeErasedGenericClassType(transformed))) &&
+               "Substituted SILFunctionType can't be transformed into a "
+               "concrete type");
         newReplacements.push_back(transformed->getCanonicalType());
         if (!type->isEqual(transformed))
           changed = true;

lib/Basic/Platform.cpp

@@ -131,23 +131,6 @@ DarwinPlatformKind swift::getDarwinPlatformKind(const llvm::Triple &triple) {
   llvm_unreachable("Unsupported Darwin platform");
 }
 
-DarwinPlatformKind swift::getNonSimulatorPlatform(DarwinPlatformKind platform) {
-  switch (platform) {
-  case DarwinPlatformKind::MacOS:
-    return DarwinPlatformKind::MacOS;
-  case DarwinPlatformKind::IPhoneOS:
-  case DarwinPlatformKind::IPhoneOSSimulator:
-    return DarwinPlatformKind::IPhoneOS;
-  case DarwinPlatformKind::TvOS:
-  case DarwinPlatformKind::TvOSSimulator:
-    return DarwinPlatformKind::TvOS;
-  case DarwinPlatformKind::WatchOS:
-  case DarwinPlatformKind::WatchOSSimulator:
-    return DarwinPlatformKind::WatchOS;
-  }
-  llvm_unreachable("Unsupported Darwin platform");
-}
-
 static StringRef getPlatformNameForDarwin(const DarwinPlatformKind platform) {
   switch (platform) {
   case DarwinPlatformKind::MacOS:

lib/Driver/DarwinToolChains.cpp

@@ -89,12 +89,9 @@ toolchains::Darwin::constructInvocation(const InterpretJobAction &job,
 }
 
 static StringRef
-getDarwinLibraryNameSuffixForTriple(const llvm::Triple &triple,
-                                    bool distinguishSimulator = true) {
+getDarwinLibraryNameSuffixForTriple(const llvm::Triple &triple) {
   const DarwinPlatformKind kind = getDarwinPlatformKind(triple);
-  const DarwinPlatformKind effectiveKind =
-      distinguishSimulator ? kind : getNonSimulatorPlatform(kind);
-  switch (effectiveKind) {
+  switch (kind) {
   case DarwinPlatformKind::MacOS:
     return "osx";
   case DarwinPlatformKind::IPhoneOS:
@@ -622,14 +619,6 @@ toolchains::Darwin::addDeploymentTargetArgs(ArgStringList &Arguments,
           micro = firstMacARM64e.getSubminor().getValueOr(0);
         }
 
-        // Temporary hack: adjust macOS version passed to the linker from
-        // 11 down to 10.16, but only for x86.
-        if (triple.isX86() && major == 11) {
-          major = 10;
-          minor = 16;
-          micro = 0;
-        }
-
         break;
       case DarwinPlatformKind::IPhoneOS:
       case DarwinPlatformKind::IPhoneOSSimulator:
@@ -754,7 +743,7 @@ toolchains::Darwin::constructInvocation(const DynamicLinkJobAction &job,
   llvm::sys::path::append(
       CompilerRTPath,
       Twine("libclang_rt.") +
-        getDarwinLibraryNameSuffixForTriple(Triple, /*simulator*/false) +
+        getDarwinLibraryNameSuffixForTriple(Triple) +
         ".a");
   if (llvm::sys::fs::exists(CompilerRTPath))
     Arguments.push_back(context.Args.MakeArgString(CompilerRTPath));

lib/Driver/ToolChains.cpp

@@ -252,6 +252,10 @@ void ToolChain::addCommonFrontendArgs(const OutputInfo &OI,
   inputArgs.AddLastArg(arguments, options::OPT_disable_parser_lookup);
   inputArgs.AddLastArg(arguments,
                        options::OPT_enable_experimental_concise_pound_file);
+  inputArgs.AddLastArg(
+      arguments,
+      options::OPT_enable_fuzzy_forward_scan_trailing_closure_matching,
+      options::OPT_disable_fuzzy_forward_scan_trailing_closure_matching);
   inputArgs.AddLastArg(arguments,
                        options::OPT_verify_incremental_dependencies);