[APINotes] Protocols cannot use import-as-member. (#4484)

We could support this in the future but right now it's causing problems.
There's also a potential ambiguity issue here where a protocol and class
could have the same name.

In addition to updating the importer, remove the two entries from the
CryptoTokenKit API notes that were trying to use this feature.

rdar://problem/27990168

Author: jrose-apple

apinotes/CryptoTokenKit.apinotes

@@ -33,10 +33,6 @@ Classes:
     SwiftPrivate: true
 - Name: TKSmartCardATRInterfaceGroup
   SwiftName: TKSmartCardATR.InterfaceGroup
-- Name: TKTokenKeyAlgorithm
-  SwiftName: TKTokenSessionDelegate.KeyAlgorithm
-- Name: TKTokenKeyExchangeParameters
-  SwiftName: TKTokenSessionDelegate.KeyExchangeParameters
 Protocols:
 - Name: TKTokenSessionDelegate
   Methods:

lib/ClangImporter/SwiftLookupTable.cpp

@@ -216,7 +216,6 @@ clang::NamedDecl *SwiftLookupTable::resolveContext(StringRef unresolvedName) {
     if (auto decl = entry.dyn_cast<clang::NamedDecl *>()) {
       if (isa<clang::TagDecl>(decl) ||
           isa<clang::ObjCInterfaceDecl>(decl) ||
-          isa<clang::ObjCProtocolDecl>(decl) ||
           isa<clang::TypedefNameDecl>(decl))
         return decl;
     }

test/IDE/Inputs/custom-modules/ImportAsMemberError.h

@@ -12,18 +12,6 @@ struct __attribute__((swift_name("ErrorStruct"))) IAMStruct {
 @end
 typedef NSObject<ImportedProtocolBase> *ImportedProtocolBase_t;
 
-@protocol ErrorProto;
-@protocol ErrorProto <ImportedProtocolBase>
-@end
-
-typedef NSObject<ErrorProto> *ErrorProto_t;
-
-// Instance and static member onto protocol
-void mutateSomeStaticState(void)
-    __attribute__((swift_name("ErrorProto.mutateSomeStaticState()"))); // ok
-void mutateSomeInstanceState(ErrorProto_t self) __attribute__((
-    swift_name("ErrorProto.mutateSomeInstanceState(self:)"))); // error
-
 // Non-prototype declaration
 extern void IAMErrorStructHasPrototype(void)
     __attribute__((swift_name("ErrorStruct.hasPrototype()"))); // ok

test/IDE/Inputs/custom-modules/ImportAsMemberProto.h

@@ -37,11 +37,6 @@ module ImportAsMember {
     header "ImportAsMemberC.h"
   }
 
-  module Proto {
-    requires objc
-    header "ImportAsMemberProto.h"
-  }
-
   module Class {
     requires objc
     header "ImportAsMemberClass.h"

test/IDE/Inputs/custom-modules/module.map

@@ -1,20 +1,3 @@
-// RUN: %target-swift-ide-test(mock-sdk: %clang-importer-sdk) -I %t -I %S/Inputs/custom-modules -print-module -source-filename %s -module-to-print=ImportAsMember.Proto -always-argument-labels > %t.printed.Proto.txt
-
-// RUN: %FileCheck %s -check-prefix=PRINT-PROTO -strict-whitespace < %t.printed.Proto.txt
-
-// PRINT-PROTO-LABEL: protocol ImportedProtocolBase : NSObjectProtocol {
-// PRINT-PROTO-NEXT:  }
-// PRINT-PROTO-NEXT:  typealias ImportedProtocolBase_t = ImportedProtocolBase
-// PRINT-PROTO-NEXT:  protocol IAMProto : ImportedProtocolBase {
-// PRINT-PROTO-NEXT:  }
-// PRINT-PROTO-NEXT:  typealias IAMProto_t = IAMProto
-// PRINT-PROTO-NEXT:  extension IAMProto {
-// PRINT-PROTO-NEXT:    func mutateSomeState()
-// PRINT-PROTO-NEXT:    func mutateSomeState(withParameter _: Int)
-// PRINT-PROTO-NEXT:    func mutateSomeState(withFirstParameter _: Int)
-// PRINT-PROTO-NEXT:    var someValue: Int32
-// PRINT-PROTO-NEXT:  }
-
 // RUN: %target-swift-ide-test(mock-sdk: %clang-importer-sdk) -I %t -I %S/Inputs/custom-modules -print-module -source-filename %s -module-to-print=ImportAsMember.Class -always-argument-labels > %t.printed.Class.txt
 
 // RUN: %FileCheck %s -check-prefix=PRINT-CLASS -strict-whitespace < %t.printed.Class.txt
@@ -37,32 +20,12 @@
 // REQUIRES: objc_interop
 
 import Foundation
-import ImportAsMember.Proto
 import ImportAsMember.Class
 import IAMError
 
 // Errors
 ErrorStruct.hasPrototype();
 
-// Protocols
-@objc class Foo : NSObject, IAMProto {}
-
-struct Bar : IAMProto {}
-  // expected-error@-1{{non-class type 'Bar' cannot conform to class protocol 'IAMProto'}}
-  // expected-error@-2{{non-class type 'Bar' cannot conform to class protocol 'ImportedProtocolBase'}}
-  // expected-error@-3{{non-class type 'Bar' cannot conform to class protocol 'NSObjectProtocol'}}
-
-@objc class FooErr : NSObject, ErrorProto {}
-
-let foo = Foo()
-foo.mutateSomeState()
-
-let fooErr = FooErr()
-fooErr.mutateSomeInstanceState()
-FooErr.mutateSomeStaticState()
-  // expected-error@-1{{type 'FooErr' has no member 'mutateSomeStaticState'}}
-
-
 // Import into members of an imported, renamed class.
 let someClassOpts: SomeClass.Options = .fuzzyDice
 let someClass = SomeClass(value: 3.14159)

test/IDE/import_as_member_objc.swift

@@ -10,7 +10,6 @@ import ImportAsMember
 sil @IAMStruct1CreateSimple : $@convention(c) () -> Struct1
 sil @IAMStruct1Rotate : $@convention(c) (@in Struct1, Double) -> Struct1
 sil @IAMStruct1SetAltitude : $@convention(c) (@inout Struct1, Double) -> ()
-sil @mutateSomeState : $@convention(c) <τ_0_0 where τ_0_0 : IAMProto> (τ_0_0) -> ()
 
 sil @invoke_methods : $@convention(thin) (Double) -> () {
 entry(%z : $Double):
@@ -25,14 +24,3 @@ entry(%z : $Double):
   dealloc_stack %c : $*Struct1
   return undef : $()
 }
-
-// CHECK-LABEL: define void @invoke_protocol_methods(%objc_object*)
-sil @invoke_protocol_methods : $@convention(thin) (IAMProto) -> () {
-entry(%z : $IAMProto):
-  %a = open_existential_ref %z : $IAMProto to $@opened("01234567-89AB-CDEF-0123-000000000000") IAMProto
-  %b = function_ref @mutateSomeState : $@convention(c) <τ_0_0 where τ_0_0 : IAMProto> (τ_0_0) -> ()
-  // CHECK: [[CAST:%.*]] = bitcast %objc_object* %0 to i8*
-  // CHECK: call void @mutateSomeState(i8* [[CAST]])
-  apply %b<@opened("01234567-89AB-CDEF-0123-000000000000") IAMProto>(%a) : $@convention(c) <τ_0_0 where τ_0_0 : IAMProto> (τ_0_0) -> ()
-  return undef : $()
-}

test/IRGen/cf_members.sil

@@ -245,21 +245,6 @@ public func bar(_ x: Double) {
   c()
 }
 
-// CHECK-LABEL: sil @_TF10cf_members16importAsProtocolFPSo8IAMProto_T_
-public func importAsProtocol(_ x: IAMProto_t) {
-  // CHECK: function_ref @mutateSomeState : $@convention(c) <τ_0_0 where τ_0_0 : IAMProto> (τ_0_0) -> ()
-  x.mutateSomeState()
-  // CHECK: function_ref @mutateSomeStateWithParameter : $@convention(c) <τ_0_0 where τ_0_0 : IAMProto> (τ_0_0, Int) -> ()
-  x.mutateSomeState(withParameter: 0)
-  // CHECK: function_ref @mutateSomeStateWithFirstParameter : $@convention(c) <τ_0_0 where τ_0_0 : IAMProto> (Int, τ_0_0) -> ()
-  x.mutateSomeState(withFirstParameter: 0)
-
-  // CHECK: function_ref @getSomeValue : $@convention(c) <τ_0_0 where τ_0_0 : IAMProto> (τ_0_0) -> Int32
-  let y = x.someValue
-  // CHECK: function_ref @setSomeValue : $@convention(c) <τ_0_0 where τ_0_0 : IAMProto> (τ_0_0, Int32) -> Int32
-  x.someValue = y
-}
-
 // CHECK-LABEL: sil @_TF10cf_members28importGlobalVarsAsProperties
 public func importGlobalVarsAsProperties()
     -> (Double, CCPowerSupply, CCPowerSupply?) {

test/SILGen/cf_members.swift

@@ -1,7 +1,6 @@
 // RUN: %target-swift-frontend -emit-silgen -I %S/../IDE/Inputs/custom-modules %s 2>&1 | %FileCheck --check-prefix=SIL %s
 // REQUIRES: objc_interop
 import ImportAsMember.A
-import ImportAsMember.Proto
 import ImportAsMember.Class
 
 public func returnGlobalVar() -> Double {
@@ -13,14 +12,6 @@ public func returnGlobalVar() -> Double {
 // SIL:   return %2 : $Double
 // SIL-NEXT: }
 
-// SIL-LABEL: sil {{.*}}useProto{{.*}} (@owned IAMProto) -> () {
-// TODO: Add in body checks
-public func useProto(p: IAMProto) {
-	p.mutateSomeState()
-	let v = p.someValue
-	p.someValue = v+1
-}
-
 // SIL-LABEL: sil {{.*}}anchor{{.*}} () -> () {
 func anchor() {}
 

test/SILGen/import_as_member.swift

@@ -69,8 +69,8 @@ if #available(OSX 10.12, *) {
 
   struct TKTokenTest {
     func f1(session: TKTokenSession, sessionDelegate: TKTokenSessionDelegate,
-            algorithm: TKTokenSessionDelegate.KeyAlgorithm,
-            parameters: TKTokenSessionDelegate.KeyExchangeParameters) throws {
+            algorithm: TKTokenKeyAlgorithm,
+            parameters: TKTokenKeyExchangeParameters) throws {
       let _: Bool = sessionDelegate.tokenSession!(session, supports: .none,
            keyObjectID: "", algorithm: algorithm)
       let _: Data = try sessionDelegate.tokenSession!(session, sign: Data(),