[Sema] Delay partial availability diagnostics, just like deprecated

This is done so that the following compiles with no warnings:
int fn(type_10_12) __attribute__((availability(macos, introduced=10.12)));

Differential revision: https://reviews.llvm.org/D25284

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@285457 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Sema/DelayedDiagnostic.h

@@ -113,9 +113,9 @@ private:
 /// the complete parsing of the current declaration.
 class DelayedDiagnostic {
 public:
-  enum DDKind { Deprecation, Unavailable, Access, ForbiddenType };
+  enum DDKind : unsigned char { Availability, Access, ForbiddenType };
 
-  unsigned char Kind; // actually a DDKind
+  DDKind Kind;
   bool Triggered;
 
   SourceLocation Loc;
@@ -164,17 +164,19 @@ public:
     return *reinterpret_cast<const AccessedEntity*>(AccessData);
   }
 
-  const NamedDecl *getDeprecationDecl() const {
-    assert((Kind == Deprecation || Kind == Unavailable) &&
-           "Not a deprecation diagnostic.");
-    return DeprecationData.Decl;
+  const NamedDecl *getAvailabilityDecl() const {
+    assert(Kind == Availability && "Not an availability diagnostic.");
+    return AvailabilityData.Decl;
   }
 
-  StringRef getDeprecationMessage() const {
-    assert((Kind == Deprecation || Kind == Unavailable) &&
-           "Not a deprecation diagnostic.");
-    return StringRef(DeprecationData.Message,
-                           DeprecationData.MessageLen);
+  StringRef getAvailabilityMessage() const {
+    assert(Kind == Availability && "Not an availability diagnostic.");
+    return StringRef(AvailabilityData.Message, AvailabilityData.MessageLen);
+  }
+
+  AvailabilityResult getAvailabilityResult() const {
+    assert(Kind == Availability && "Not an availability diagnostic.");
+    return AvailabilityData.AR;
   }
 
   /// The diagnostic ID to emit.  Used like so:
@@ -195,27 +197,28 @@ public:
     assert(Kind == ForbiddenType && "not a forbidden-type diagnostic");
     return QualType::getFromOpaquePtr(ForbiddenTypeData.OperandType);
   }
-  
+
   const ObjCInterfaceDecl *getUnknownObjCClass() const {
-    return DeprecationData.UnknownObjCClass;
+    return AvailabilityData.UnknownObjCClass;
   }
 
   const ObjCPropertyDecl *getObjCProperty() const {
-    return DeprecationData.ObjCProperty;
+    return AvailabilityData.ObjCProperty;
   }
-    
+
   bool getObjCPropertyAccess() const {
-    return DeprecationData.ObjCPropertyAccess;
+    return AvailabilityData.ObjCPropertyAccess;
   }
-  
+
 private:
 
-  struct DD {
+  struct AD {
     const NamedDecl *Decl;
     const ObjCInterfaceDecl *UnknownObjCClass;
     const ObjCPropertyDecl  *ObjCProperty;
     const char *Message;
     size_t MessageLen;
+    AvailabilityResult AR;
     bool ObjCPropertyAccess;
   };
 
@@ -226,8 +229,7 @@ private:
   };
 
   union {
-    /// Deprecation
-    struct DD DeprecationData;
+    struct AD AvailabilityData;
     struct FTD ForbiddenTypeData;
 
     /// Access control.

lib/Sema/DelayedDiagnostic.cpp

@@ -20,7 +20,7 @@ using namespace clang;
 using namespace sema;
 
 DelayedDiagnostic
-DelayedDiagnostic::makeAvailability(AvailabilityResult AD,
+DelayedDiagnostic::makeAvailability(AvailabilityResult AR,
                                     SourceLocation Loc,
                                     const NamedDecl *D,
                                     const ObjCInterfaceDecl *UnknownObjCClass,
@@ -28,42 +28,33 @@ DelayedDiagnostic::makeAvailability(AvailabilityResult AD,
                                     StringRef Msg,
                                     bool ObjCPropertyAccess) {
   DelayedDiagnostic DD;
-  switch (AD) {
-  case AR_Deprecated:
-    DD.Kind = Deprecation;
-    break;
-  case AR_Unavailable:
-    DD.Kind = Unavailable;
-    break;
-  default:
-    llvm_unreachable("partial diags should not be delayed");
-  }
+  DD.Kind = Availability;
   DD.Triggered = false;
   DD.Loc = Loc;
-  DD.DeprecationData.Decl = D;
-  DD.DeprecationData.UnknownObjCClass = UnknownObjCClass;
-  DD.DeprecationData.ObjCProperty = ObjCProperty;
+  DD.AvailabilityData.Decl = D;
+  DD.AvailabilityData.UnknownObjCClass = UnknownObjCClass;
+  DD.AvailabilityData.ObjCProperty = ObjCProperty;
   char *MessageData = nullptr;
   if (Msg.size()) {
     MessageData = new char [Msg.size()];
     memcpy(MessageData, Msg.data(), Msg.size());
   }
 
-  DD.DeprecationData.Message = MessageData;
-  DD.DeprecationData.MessageLen = Msg.size();
-  DD.DeprecationData.ObjCPropertyAccess = ObjCPropertyAccess;
+  DD.AvailabilityData.Message = MessageData;
+  DD.AvailabilityData.MessageLen = Msg.size();
+  DD.AvailabilityData.AR = AR;
+  DD.AvailabilityData.ObjCPropertyAccess = ObjCPropertyAccess;
   return DD;
 }
 
 void DelayedDiagnostic::Destroy() {
-  switch (static_cast<DDKind>(Kind)) {
+  switch (Kind) {
   case Access: 
     getAccessData().~AccessedEntity(); 
     break;
 
-  case Deprecation:
-  case Unavailable:
-    delete [] DeprecationData.Message;
+  case Availability:
+    delete[] AvailabilityData.Message;
     break;
 
   case ForbiddenType:

lib/Sema/SemaDeclAttr.cpp

@@ -6510,9 +6510,6 @@ static void DoEmitAvailabilityWarning(Sema &S, AvailabilityResult K,
     break;
 
   case AR_NotYetIntroduced:
-    assert(!S.getCurFunctionOrMethodDecl() &&
-           "Function-level partial availablity should not be diagnosed here!");
-
     diag = diag::warn_partial_availability;
     diag_message = diag::warn_partial_message;
     diag_fwdclass_message = diag::warn_partial_fwdclass_message;
@@ -6585,15 +6582,14 @@ static void DoEmitAvailabilityWarning(Sema &S, AvailabilityResult K,
 
 static void handleDelayedAvailabilityCheck(Sema &S, DelayedDiagnostic &DD,
                                            Decl *Ctx) {
-  assert(DD.Kind == DelayedDiagnostic::Deprecation ||
-         DD.Kind == DelayedDiagnostic::Unavailable);
-  AvailabilityResult AR = DD.Kind == DelayedDiagnostic::Deprecation
-                              ? AR_Deprecated
-                              : AR_Unavailable;
+  assert(DD.Kind == DelayedDiagnostic::Availability &&
+         "Expected an availability diagnostic here");
+
   DD.Triggered = true;
   DoEmitAvailabilityWarning(
-      S, AR, Ctx, DD.getDeprecationDecl(), DD.getDeprecationMessage(), DD.Loc,
-      DD.getUnknownObjCClass(), DD.getObjCProperty(), false);
+      S, DD.getAvailabilityResult(), Ctx, DD.getAvailabilityDecl(),
+      DD.getAvailabilityMessage(), DD.Loc, DD.getUnknownObjCClass(),
+      DD.getObjCProperty(), false);
 }
 
 void Sema::PopParsingDeclaration(ParsingDeclState state, Decl *decl) {
@@ -6623,8 +6619,7 @@ void Sema::PopParsingDeclaration(ParsingDeclState state, Decl *decl) {
         continue;
 
       switch (diag.Kind) {
-      case DelayedDiagnostic::Deprecation:
-      case DelayedDiagnostic::Unavailable:
+      case DelayedDiagnostic::Availability:
         // Don't bother giving deprecation/unavailable diagnostics if
         // the decl is invalid.
         if (!decl->isInvalidDecl())
@@ -6659,8 +6654,7 @@ void Sema::EmitAvailabilityWarning(AvailabilityResult AR,
                                    const ObjCPropertyDecl  *ObjCProperty,
                                    bool ObjCPropertyAccess) {
   // Delay if we're currently parsing a declaration.
-  if (DelayedDiagnostics.shouldDelayDiagnostics() &&
-      AR != AR_NotYetIntroduced) {
+  if (DelayedDiagnostics.shouldDelayDiagnostics()) {
     DelayedDiagnostics.add(DelayedDiagnostic::makeAvailability(
         AR, Loc, D, UnknownObjCClass, ObjCProperty, Message,
         ObjCPropertyAccess));

test/SemaObjC/unguarded-availability.m

@@ -63,7 +63,7 @@ typedef int int_10_11 AVAILABLE_10_11; // expected-note {{'int_10_11' has been e
 #ifdef OBJCPP
 // expected-note@+2 {{marked partial here}}
 #endif
-typedef int int_10_12 AVAILABLE_10_12; // expected-note 3 {{'int_10_12' has been explicitly marked partial here}}
+typedef int int_10_12 AVAILABLE_10_12; // expected-note 2 {{'int_10_12' has been explicitly marked partial here}}
 
 void use_typedef() {
   int_10_11 x; // expected-warning{{'int_10_11' is only available on macOS 10.11 or newer}} expected-note{{enclose 'int_10_11' in an @available check to silence this warning}}
@@ -127,8 +127,7 @@ void test_blocks() {
 
 void test_params(int_10_12 x); // expected-warning {{'int_10_12' is partial: introduced in macOS 10.12}} expected-note{{redeclare}}
 
-// FIXME: This should be fine!
-void test_params2(int_10_12 x) AVAILABLE_10_12; // expected-warning {{'int_10_12' is partial: introduced in macOS 10.12}} expected-note{{redeclare}}
+void test_params2(int_10_12 x) AVAILABLE_10_12; // no warn
 
 #ifdef OBJCPP