[api-digester] Teach the api-digester about hasMissingDesignatedInitializers

Because we won’t be serializing this attribute, add custom diagnostics for the cases where:

- We add @_hasMissingDesignatedInits to an open class, which means subclasses won’t be able to inherit its inits
- We remove @_inheritsConvenienceInitializers, which means APIs are removed

include/swift/AST/DiagnosticsModuleDiffer.def

@@ -98,6 +98,10 @@ ERROR(objc_name_change,none,"%0 has ObjC name change from %1 to %2", (StringRef,
 
 ERROR(desig_init_added,none,"%0 has been added as a designated initializer to an open class", (StringRef))
 
+ERROR(added_invisible_designated_init,none,"%0 has new designated initializers that are not visible to clients", (StringRef))
+
+ERROR(not_inheriting_convenience_inits,none,"%0 no longer inherits convenience inits from its superclass", (StringRef))
+
 #ifndef DIAG_NO_UNDEF
 # if defined(DIAG)
 #  undef DIAG

include/swift/IDE/DigesterEnums.def

@@ -132,6 +132,8 @@ KEY_BOOL(HasStorage, hasStorage)
 KEY_BOOL(ReqNewWitnessTableEntry, reqNewWitnessTableEntry)
 KEY_BOOL(IsABIPlaceholder, isABIPlaceholder)
 KEY_BOOL(IsExternal, isExternal)
+KEY_BOOL(HasMissingDesignatedInitializers, hasMissingDesignatedInitializers)
+KEY_BOOL(InheritsConvenienceInitializers, inheritsConvenienceInitializers)
 
 KEY(kind)
 

test/api-digester/Inputs/cake_baseline/cake.swift

@@ -105,7 +105,26 @@ public protocol DerivedProtocolRequiementChanges: RequiementChanges {}
 
 public class SuperClassRemoval: C3 {}
 
-public class ClassToStruct {}
+public class ClassToStruct {
+  public init() {}
+}
+
+open class ClassWithMissingDesignatedInits {
+  internal init() {}
+  public convenience init(x: Int) { self.init() }
+}
+
+open class ClassWithoutMissingDesignatedInits {
+  public init() {}
+  public convenience init(x: Int) { self.init() }
+}
+
+public class SubclassWithMissingDesignatedInits: ClassWithMissingDesignatedInits {
+}
+
+public class SubclassWithoutMissingDesignatedInits: ClassWithoutMissingDesignatedInits {
+}
+
 public protocol ProtocolToEnum {}
 
 public class SuperClassChange: C7 {}

test/api-digester/Inputs/cake_current/cake.swift

@@ -114,7 +114,30 @@ public protocol DerivedProtocolRequiementChanges: RequiementChanges {}
 
 public class SuperClassRemoval {}
 
-public struct ClassToStruct {}
+public struct ClassToStruct {
+  public init() {}
+}
+
+open class ClassWithMissingDesignatedInits {
+  // Remove the @_hasMissingDesignatedInitializers attribute
+  public init() {}
+  public convenience init(x: Int) { self.init() }
+}
+
+open class ClassWithoutMissingDesignatedInits {
+  // Add the @_hasMissingDesignatedInitializers attribute by adding an inaccessible
+  // init
+  public init() {}
+  public convenience init(x: Int) { self.init() }
+  internal init(y: Int) {}
+}
+
+public class SubclassWithMissingDesignatedInits: ClassWithMissingDesignatedInits {
+}
+
+public class SubclassWithoutMissingDesignatedInits: ClassWithoutMissingDesignatedInits {
+}
+
 public enum ProtocolToEnum {}
 
 public class SuperClassChange: C8 {}

test/api-digester/Outputs/Cake-abi.txt

@@ -60,6 +60,8 @@ cake: Class C0 is a new API without @available attribute
 cake: Class C5 is now without @objc
 cake: Class C8 is a new API without @available attribute
 cake: Constructor C1.init(_:) is a new API without @available attribute
+cake: Constructor ClassWithMissingDesignatedInits.init() is a new API without @available attribute
+cake: Constructor SubclassWithMissingDesignatedInits.init() is a new API without @available attribute
 cake: Enum IceKind is now without @frozen
 cake: EnumElement FrozenKind.AddedCase is a new API without @available attribute
 cake: Func C1.foo1() is now not static
@@ -102,10 +104,10 @@ cake: Struct fixedLayoutStruct has added a conformance to an existing protocol P
 cake: Struct fixedLayoutStruct has removed conformance to P1
 
 /* Protocol Requirement Change */
-cake: Accessor HasMutatingMethodClone.bar.Get() now requires  new witness table entry
+cake: Accessor HasMutatingMethodClone.bar.Get() now requires new witness table entry
 cake: AssociatedType AssociatedTypePro.T1 has removed default type Swift.Int
 cake: AssociatedType RequiementChanges.addedTypeWithoutDefault has been added as a protocol requirement
-cake: Func HasMutatingMethodClone.foo() now requires  new witness table entry
+cake: Func HasMutatingMethodClone.foo() now requires new witness table entry
 cake: Func RequiementChanges.addedFunc() has been added as a protocol requirement
 cake: Var RequiementChanges.addedVar has been added as a protocol requirement
 
@@ -113,4 +115,6 @@ cake: Var RequiementChanges.addedVar has been added as a protocol requirement
 cake: Class C4 has changed its super class from APINotesTest.OldType to APINotesTest.NewType
 cake: Class SubGenericClass has changed its super class from cake.GenericClass<cake.P1> to cake.GenericClass<cake.P2>
 cake: Class SuperClassRemoval has removed its super class cake.C3
+cake: Class SuperClassRemoval no longer inherits convenience inits from its superclass
 cake: Constructor AddingNewDesignatedInit.init(_:) has been added as a designated initializer to an open class
+cake: Constructor ClassWithMissingDesignatedInits.init() has been added as a designated initializer to an open class

test/api-digester/Outputs/Cake.txt

@@ -64,7 +64,9 @@ cake: Accessor ClassWithOpenMember.property.Get() is no longer open for subclass
 cake: Class C4 has changed its super class from APINotesTest.OldType to APINotesTest.NewType
 cake: Class SubGenericClass has changed its super class from cake.GenericClass<cake.P1> to cake.GenericClass<cake.P2>
 cake: Class SuperClassRemoval has removed its super class cake.C3
+cake: Class SuperClassRemoval no longer inherits convenience inits from its superclass
 cake: Constructor AddingNewDesignatedInit.init(_:) has been added as a designated initializer to an open class
+cake: Constructor ClassWithMissingDesignatedInits.init() has been added as a designated initializer to an open class
 cake: Func ClassWithOpenMember.bar() is no longer open for subclassing
 cake: Func ClassWithOpenMember.foo() is no longer open for subclassing
 cake: Var ClassWithOpenMember.property is no longer open for subclassing

test/api-digester/Outputs/cake-abi.json

@@ -199,7 +199,8 @@
       "usr": "s:4cake2C0C",
       "moduleName": "cake",
       "genericSig": "<τ_0_0, τ_0_1, τ_0_2>",
-      "sugared_genericSig": "<T1, T2, T3>"
+      "sugared_genericSig": "<T1, T2, T3>",
+      "hasMissingDesignatedInitializers": true
     },
     {
       "kind": "TypeDecl",
@@ -428,6 +429,8 @@
       "usr": "s:4cake2C1C",
       "moduleName": "cake",
       "superclassUsr": "s:4cake2C0C",
+      "hasMissingDesignatedInitializers": true,
+      "inheritsConvenienceInitializers": true,
       "superclassNames": [
         "cake.C0<cake.S1, cake.S1, cake.S1>"
       ]
@@ -1330,7 +1333,8 @@
       "declAttributes": [
         "FixedLayout",
         "UsableFromInline"
-      ]
+      ],
+      "hasMissingDesignatedInitializers": true
     },
     {
       "kind": "TypeDecl",
@@ -1387,6 +1391,7 @@
       "declKind": "Class",
       "usr": "s:4cake15FutureContainerC",
       "moduleName": "cake",
+      "hasMissingDesignatedInitializers": true,
       "conformances": [
         {
           "kind": "Conformance",
@@ -1418,7 +1423,8 @@
         "Available",
         "Available",
         "Available"
-      ]
+      ],
+      "hasMissingDesignatedInitializers": true
     },
     {
       "kind": "TypeDecl",
@@ -1430,7 +1436,8 @@
       "intro_swift": "5",
       "declAttributes": [
         "Available"
-      ]
+      ],
+      "hasMissingDesignatedInitializers": true
     },
     {
       "kind": "TypeDecl",
@@ -1482,7 +1489,8 @@
       "objc_name": "NewObjCClass",
       "declAttributes": [
         "ObjC"
-      ]
+      ],
+      "hasMissingDesignatedInitializers": true
     },
     {
       "kind": "TypeDecl",

test/api-digester/Outputs/cake.json

@@ -201,7 +201,8 @@
       "declKind": "Class",
       "usr": "s:4cake2C0C",
       "moduleName": "cake",
-      "genericSig": "<T1, T2, T3>"
+      "genericSig": "<T1, T2, T3>",
+      "hasMissingDesignatedInitializers": true
     },
     {
       "kind": "TypeAlias",
@@ -425,6 +426,8 @@
       "usr": "s:4cake2C1C",
       "moduleName": "cake",
       "superclassUsr": "s:4cake2C0C",
+      "hasMissingDesignatedInitializers": true,
+      "inheritsConvenienceInitializers": true,
       "superclassNames": [
         "cake.C0<cake.S1, cake.S1, cake.S1>"
       ]
@@ -1235,6 +1238,7 @@
       "declKind": "Class",
       "usr": "s:4cake15FutureContainerC",
       "moduleName": "cake",
+      "hasMissingDesignatedInitializers": true,
       "conformances": [
         {
           "kind": "Conformance",
@@ -1266,7 +1270,8 @@
         "Available",
         "Available",
         "Available"
-      ]
+      ],
+      "hasMissingDesignatedInitializers": true
     },
     {
       "kind": "TypeDecl",
@@ -1278,7 +1283,8 @@
       "intro_swift": "5",
       "declAttributes": [
         "Available"
-      ]
+      ],
+      "hasMissingDesignatedInitializers": true
     },
     {
       "kind": "TypeDecl",
@@ -1330,7 +1336,8 @@
       "objc_name": "NewObjCClass",
       "declAttributes": [
         "ObjC"
-      ]
+      ],
+      "hasMissingDesignatedInitializers": true
     },
     {
       "kind": "TypeDecl",

test/api-digester/Outputs/clang-module-dump.txt

@@ -119,6 +119,7 @@
         "Dynamic"
       ],
       "superclassUsr": "c:objc(cs)NSObject",
+      "inheritsConvenienceInitializers": true,
       "superclassNames": [
         "ObjectiveC.NSObject"
       ],
@@ -134,6 +135,24 @@
           "name": "NSObjectProtocol",
           "printedName": "NSObjectProtocol",
           "usr": "c:objc(pl)NSObject"
+        },
+        {
+          "kind": "Conformance",
+          "name": "Equatable",
+          "printedName": "Equatable",
+          "usr": "s:SQ"
+        },
+        {
+          "kind": "Conformance",
+          "name": "Hashable",
+          "printedName": "Hashable",
+          "usr": "s:SH"
+        },
+        {
+          "kind": "Conformance",
+          "name": "CVarArg",
+          "printedName": "CVarArg",
+          "usr": "s:s7CVarArgP"
         }
       ]
     },

test/api-digester/compare-dump.swift

@@ -4,8 +4,8 @@
 // RUN: %empty-directory(%t.module-cache)
 // RUN: %swift -emit-module -o %t.mod1/cake.swiftmodule %S/Inputs/cake_baseline/cake.swift -parse-as-library -enable-library-evolution -I %S/Inputs/APINotesLeft %clang-importer-sdk-nosource -module-name cake
 // RUN: %swift -emit-module -o %t.mod2/cake.swiftmodule %S/Inputs/cake_current/cake.swift -parse-as-library -enable-library-evolution -I %S/Inputs/APINotesRight %clang-importer-sdk-nosource -module-name cake
-// RUN: %api-digester -dump-sdk -module cake -o - -module-cache-path %t.module-cache %clang-importer-sdk-nosource -I %t.mod1 -I %S/Inputs/APINotesLeft > %t.dump1.json
+// RUN: %api-digester -dump-sdk -module cake -o %t.dump1.json -module-cache-path %t.module-cache %clang-importer-sdk-nosource -I %t.mod1 -I %S/Inputs/APINotesLeft
-// RUN: %api-digester -dump-sdk -module cake -o - -module-cache-path %t.module-cache %clang-importer-sdk-nosource -I %t.mod2 -I %S/Inputs/APINotesLeft > %t.dump2.json
+// RUN: %api-digester -dump-sdk -module cake -o %t.dump2.json -module-cache-path %t.module-cache %clang-importer-sdk-nosource -I %t.mod2 -I %S/Inputs/APINotesRight
 // RUN: %api-digester -diagnose-sdk -print-module --input-paths %t.dump1.json -input-paths %t.dump2.json -o %t.result
 
 // RUN: %clang -E -P -x c %S/Outputs/Cake.txt -o - | sed '/^\s*$/d' > %t.expected

tools/swift-api-digester/ModuleAnalyzerNodes.cpp

@@ -126,7 +126,9 @@ SDKNodeTypeAlias::SDKNodeTypeAlias(SDKNodeInitInfo Info):
 SDKNodeDeclType::SDKNodeDeclType(SDKNodeInitInfo Info):
   SDKNodeDecl(Info, SDKNodeKind::DeclType), SuperclassUsr(Info.SuperclassUsr),
   SuperclassNames(Info.SuperclassNames),
-  EnumRawTypeName(Info.EnumRawTypeName), IsExternal(Info.IsExternal) {}
+  EnumRawTypeName(Info.EnumRawTypeName), IsExternal(Info.IsExternal),
+  HasMissingDesignatedInitializers(Info.HasMissingDesignatedInitializers),
+  InheritsConvenienceInitializers(Info.InheritsConvenienceInitializers) {}
 
 SDKNodeConformance::SDKNodeConformance(SDKNodeInitInfo Info):
   SDKNode(Info, SDKNodeKind::Conformance),
@@ -1403,6 +1405,8 @@ SDKNodeInitInfo::SDKNodeInitInfo(SDKContext &Ctx, ValueDecl *VD)
         SuperclassNames.push_back(getPrintedName(Ctx, T->getCanonicalType()));
       }
     }
+    HasMissingDesignatedInitializers = CD->hasMissingDesignatedInitializers();
+    InheritsConvenienceInitializers = CD->inheritsSuperclassInitializers();
   }
 
   if (auto *FD = dyn_cast<FuncDecl>(VD)) {
@@ -1975,6 +1979,10 @@ void SDKNodeDeclType::jsonize(json::Output &out) {
   output(out, KeyKind::KK_superclassUsr, SuperclassUsr);
   output(out, KeyKind::KK_enumRawTypeName, EnumRawTypeName);
   output(out, KeyKind::KK_isExternal, IsExternal);
+  output(out, KeyKind::KK_hasMissingDesignatedInitializers,
+         HasMissingDesignatedInitializers);
+  output(out, KeyKind::KK_inheritsConvenienceInitializers,
+         InheritsConvenienceInitializers);
   out.mapOptional(getKeyContent(Ctx, KeyKind::KK_superclassNames).data(), SuperclassNames);
   out.mapOptional(getKeyContent(Ctx, KeyKind::KK_conformances).data(), Conformances);
 }

tools/swift-api-digester/ModuleAnalyzerNodes.h

@@ -524,6 +524,8 @@ class SDKNodeDeclType: public SDKNodeDecl {
   // Check whether the type declaration is pulled from an external module so we
   // can incorporate extensions in the interested module.
   bool IsExternal;
+  bool HasMissingDesignatedInitializers;
+  bool InheritsConvenienceInitializers;
 public:
   SDKNodeDeclType(SDKNodeInitInfo Info);
   static bool classof(const SDKNode *N);
@@ -548,6 +550,13 @@ public:
     return EnumRawTypeName;
   }
 
+  bool hasMissingDesignatedInitializers() const {
+    return HasMissingDesignatedInitializers;
+  };
+  bool inheritsConvenienceInitializers() const {
+    return InheritsConvenienceInitializers;
+  };
+
   Optional<SDKNodeDeclType*> getSuperclass() const;
 
   /// Finding the node through all children, including the inheritted ones,

tools/swift-api-digester/ModuleDiagsConsumer.cpp

@@ -73,6 +73,8 @@ static StringRef getCategoryName(uint32_t ID) {
   case LocalDiagID::super_class_changed:
   case LocalDiagID::no_longer_open:
   case LocalDiagID::desig_init_added:
+  case LocalDiagID::added_invisible_designated_init:
+  case LocalDiagID::not_inheriting_convenience_inits:
     return "/* Class Inheritance Change */";
   default:
     return StringRef();

tools/swift-api-digester/swift-api-digester.cpp

@@ -789,6 +789,22 @@ void swift::ide::api::SDKNodeDeclType::diagnose(SDKNode *Right) {
         emitDiag(Loc, diag::super_class_changed, LSuperClass, RSuperClass);
       }
     }
+
+    // Check for @_hasMissingDesignatedInitializers and
+    // @_inheritsConvenienceInitializers changes.
+    if (isOpen() && R->isOpen()) {
+      // It's not safe to add new, invisible designated inits to open
+      // classes.
+      if (!hasMissingDesignatedInitializers() &&
+          R->hasMissingDesignatedInitializers())
+        R->emitDiag(R->getLoc(), diag::added_invisible_designated_init);
+    }
+
+    // It's not safe to stop inheriting convenience inits, it changes
+    // the set of initializers that are available.
+    if (inheritsConvenienceInitializers() &&
+        !R->inheritsConvenienceInitializers())
+      R->emitDiag(R->getLoc(), diag::not_inheriting_convenience_inits);
     break;
   }
   default: