arc migrator: Do not attempt to migrate to bridge casts which
cancel out each other. Leave it alone so users can take a look
(unmigrated code forces error diagnostic). // rdar://10521744
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149435 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/ARCMT/no-canceling-bridge-to-bridge-cast.m b/test/ARCMT/no-canceling-bridge-to-bridge-cast.m
new file mode 100644
index 0000000..e94e657
--- /dev/null
+++ b/test/ARCMT/no-canceling-bridge-to-bridge-cast.m
@@ -0,0 +1,43 @@
+// RUN: %clang_cc1 -arcmt-check -triple x86_64-apple-darwin10 -fsyntax-only -x objective-c -verify %s
+// DISABLE: mingw32
+// rdar://10387088
+typedef const void * CFTypeRef;
+
+extern
+CFTypeRef CFRetain(CFTypeRef cf);
+
+@interface INTF
+{
+ void *cf_format;
+ id objc_format;
+}
+@end
+
+@interface NSString
++ (id)stringWithFormat:(NSString *)format;
+@end
+
+@implementation INTF
+- (void) Meth {
+ NSString *result;
+
+ result = (id) CFRetain([NSString stringWithFormat:@"PBXLoopMode"]); // expected-error {{cast of C pointer type 'CFTypeRef' (aka 'const void *') to Objective-C pointer type 'id' requires a bridged cast}} \
+ // expected-note {{use __bridge to convert directly (no change in ownership)}} \
+ // expected-note {{use __bridge_transfer to transfer ownership of a +1 'CFTypeRef' (aka 'const void *') into ARC}}
+
+ result = (id) CFRetain((id)((objc_format))); // expected-error {{cast of C pointer type 'CFTypeRef' (aka 'const void *') to Objective-C pointer type 'id' requires a bridged cast}} \
+ // expected-note {{use __bridge to convert directly (no change in ownership)}} \
+ // expected-note {{use __bridge_transfer to transfer ownership of a +1 'CFTypeRef' (aka 'const void *') into ARC}}
+
+ result = (id) CFRetain((id)((cf_format))); // expected-error {{cast of C pointer type 'CFTypeRef' (aka 'const void *') to Objective-C pointer type 'id' requires a bridged cast}} \
+ // expected-note {{use __bridge to convert directly (no change in ownership)}} \
+ // expected-note {{use __bridge_transfer to transfer ownership of a +1 'CFTypeRef' (aka 'const void *') into ARC}}
+
+ result = (id) CFRetain((CFTypeRef)((objc_format))); // expected-error {{cast of C pointer type 'CFTypeRef' (aka 'const void *') to Objective-C pointer type 'id' requires a bridged cast}} \
+ // expected-note {{use __bridge to convert directly (no change in ownership)}} \
+ // expected-note {{use __bridge_transfer to transfer ownership of a +1 'CFTypeRef' (aka 'const void *') into ARC}}
+
+ result = (id) CFRetain(cf_format); // OK
+}
+@end
+