Fix ObjCMethodDecl::findPropertyDecl for class properties.

This affects code completion and a few other things; hopefully the code completion
test is sufficient to catch regressions.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@263295 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AST/DeclObjC.cpp

@@ -1234,23 +1234,29 @@ ObjCMethodDecl::findPropertyDecl(bool CheckOverrides) const {
   if (NumArgs > 1)
     return nullptr;
 
-  if (!isInstanceMethod())
-    return nullptr;
-
   if (isPropertyAccessor()) {
     const ObjCContainerDecl *Container = cast<ObjCContainerDecl>(getParent());
     bool IsGetter = (NumArgs == 0);
+    bool IsInstance = isInstanceMethod();
 
     /// Local function that attempts to find a matching property within the
     /// given Objective-C container.
     auto findMatchingProperty =
       [&](const ObjCContainerDecl *Container) -> const ObjCPropertyDecl * {
-
-      for (const auto *I : Container->instance_properties()) {
-        Selector NextSel = IsGetter ? I->getGetterName()
-                                    : I->getSetterName();
-        if (NextSel == Sel)
-          return I;
+      if (IsInstance) {
+        for (const auto *I : Container->instance_properties()) {
+          Selector NextSel = IsGetter ? I->getGetterName()
+                                      : I->getSetterName();
+          if (NextSel == Sel)
+            return I;
+        }
+      } else {
+        for (const auto *I : Container->class_properties()) {
+          Selector NextSel = IsGetter ? I->getGetterName()
+                                      : I->getSetterName();
+          if (NextSel == Sel)
+            return I;
+        }
       }
 
       return nullptr;

test/CodeCompletion/documentation.m

@@ -0,0 +1,25 @@
+// Note: the run lines follow their respective tests, since line/column
+// matter in this test.
+
+@interface Base
+@end
+
+@interface Test : Base
+/// Instance!
+@property id instanceProp;
+/// Class!
+@property (class) id classProp;
+@end
+
+void test(Test *obj) {
+  [obj instanceProp];
+  [Test classProp];
+}
+
+// RUN: %clang_cc1 -fsyntax-only -code-completion-brief-comments -code-completion-at=%s:15:8 %s -o - | FileCheck -check-prefix=CHECK-CC1 %s
+// CHECK-CC1: instanceProp : [#id#]instanceProp : Instance!
+// CHECK-CC1: setInstanceProp: : [#void#]setInstanceProp:<#(id)#> : Instance!
+
+// RUN: %clang_cc1 -fsyntax-only -code-completion-brief-comments -code-completion-at=%s:16:9 %s -o - | FileCheck -check-prefix=CHECK-CC2 %s
+// CHECK-CC2: classProp : [#id#]classProp : Class!
+// CHECK-CC2: setClassProp: : [#void#]setClassProp:<#(id)#> : Class!