[Analyzer] Fix crash in ObjCPropertyChecker on protocol property
Fix a crash in the ObjCPropertyChecker when analyzing a 'copy' property of an
NSMutable* type in a protocol.
rdar://problem/30766684
Differential Revision: https://reviews.llvm.org/D30482
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@296562 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 8acf4ef934c61633e907154eacfcf15baeb0eed2)
Integration into swift-3.1-branch is tracked by rdar://problem/30772776
diff --git a/lib/StaticAnalyzer/Checkers/ObjCPropertyChecker.cpp b/lib/StaticAnalyzer/Checkers/ObjCPropertyChecker.cpp
index b9857e5..dfd2c9a 100644
--- a/lib/StaticAnalyzer/Checkers/ObjCPropertyChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/ObjCPropertyChecker.cpp
@@ -58,8 +58,7 @@
if (const ObjCInterfaceDecl *IntD =
dyn_cast<ObjCInterfaceDecl>(D->getDeclContext())) {
ImplD = IntD->getImplementation();
- } else {
- const ObjCCategoryDecl *CatD = cast<ObjCCategoryDecl>(D->getDeclContext());
+ } else if (auto *CatD = dyn_cast<ObjCCategoryDecl>(D->getDeclContext())) {
ImplD = CatD->getClassInterface()->getImplementation();
}
diff --git a/test/Analysis/ObjCPropertiesSyntaxChecks.m b/test/Analysis/ObjCPropertiesSyntaxChecks.m
index 5c642c5..1c3ddbd 100644
--- a/test/Analysis/ObjCPropertiesSyntaxChecks.m
+++ b/test/Analysis/ObjCPropertiesSyntaxChecks.m
@@ -59,3 +59,10 @@
@interface IWithoutImpl : NSObject {}
@property(copy) NSMutableString *mutableStr; // no-warning
@end
+
+@protocol SomeProtocol
+// Don't warn on protocol properties because it is possible to
+// conform to them correctly; it is only synthesized setters that
+// that are definitely incorrect.
+@property (copy) NSMutableString *myProp; // no-crash // no-warning
+@end
