Start supporting declaration of ivars in @implementation

blocks. WIP.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@96696 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/DiagnosticSemaKinds.td

@@ -253,6 +253,12 @@ def err_dup_implementation_category : Error<
   "reimplementation of category %1 for class %0">;
 def err_conflicting_ivar_type : Error<
   "instance variable %0 has conflicting type: %1 vs %2">;
+def err_duplicate_ivar_declaration : Error<
+  "instance variable is already declared">;
+def warn_on_superclass_use : Warning<
+  "class implementation may not have super class">;
+def err_non_private_ivar_declaration : Error<
+  "only private ivars may be declared in implementation">;
 def err_conflicting_ivar_bitwidth : Error<
   "instance variable %0 has conflicting bit-field width">;
 def err_conflicting_ivar_name : Error<

lib/Sema/SemaDeclObjC.cpp

@@ -836,7 +836,26 @@ void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl,
     return;
 
   assert(ivars && "missing @implementation ivars");
-
+  if (LangOpts.ObjCNonFragileABI2) {
+    if (ImpDecl->getSuperClass())
+      Diag(ImpDecl->getLocation(), diag::warn_on_superclass_use);
+    for (unsigned i = 0; i < numIvars; i++) {
+      ObjCIvarDecl* ImplIvar = ivars[i];
+      if (const ObjCIvarDecl *ClsIvar = 
+            IDecl->getIvarDecl(ImplIvar->getIdentifier())) {
+        Diag(ImplIvar->getLocation(), diag::err_duplicate_ivar_declaration); 
+        Diag(ClsIvar->getLocation(), diag::note_previous_definition);
+        continue;
+      }
+      if (ImplIvar->getAccessControl() != ObjCIvarDecl::Private)
+        Diag(ImplIvar->getLocation(), diag::err_non_private_ivar_declaration); 
+      // Instance ivar to Implementation's DeclContext.
+      ImplIvar->setLexicalDeclContext(ImpDecl);
+      IDecl->makeDeclVisibleInContext(ImplIvar, false);
+      ImpDecl->addDecl(ImplIvar);
+    }
+    return;
+  }
   // Check interface's Ivar list against those in the implementation.
   // names and types must match.
   //

test/SemaObjC/ivar-in-implementations.m

@@ -0,0 +1,22 @@
+// RUN: %clang_cc1 -fsyntax-only -fobjc-nonfragile-abi2 -verify %s
+
+@interface Super @end
+
+@interface INTFSTANDALONE : Super
+{
+  id IVAR;	// expected-note {{previous definition is here}}
+}
+
+@end
+
+@implementation INTFSTANDALONE : Super // expected-warning {{class implementation may not have super class}}
+{
+@private
+  id IVAR1;
+@protected
+  id IVAR2;	// expected-error {{only private ivars may be declared in implementation}}
+@private
+  id IVAR3;
+  int IVAR;	// expected-error {{instance variable is already declared}}
+}
+@end