[analyzer] RetainCountChecker: don't track through xpc_connection_set_context.

It is unfortunate that we have to mark these exceptions in multiple places.
This was already in CallEvent. I suppose it does let us be more precise
about saying /which/ arguments have their retain counts invalidated -- the
connection's is still valid even though the context object's isn't -- but
we're not tracking the retain count of XPC objects anyway.

<rdar://problem/13783514>

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180904 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 24 insertions, 2 deletions

diff --git a/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp b/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
index 0d256006e1..0f456ea8d7 100644
--- a/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
@@ -1116,12 +1116,14 @@ RetainSummaryManager::getFunctionSummary(const FunctionDecl *FD) {
       // correctly.
       ScratchArgs = AF.add(ScratchArgs, 12, StopTracking);
       S = getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, DoNothing);
-    } else if (FName == "dispatch_set_context") {
+    } else if (FName == "dispatch_set_context" ||
+               FName == "xpc_connection_set_context") {
       // <rdar://problem/11059275> - The analyzer currently doesn't have
       // a good way to reason about the finalizer function for libdispatch.
       // If we pass a context object that is memory managed, stop tracking it.
+      // <rdar://problem/13783514> - Same problem, but for XPC.
       // FIXME: this hack should possibly go away once we can handle
-      // libdispatch finalizers.
+      // libdispatch and XPC finalizers.
       ScratchArgs = AF.add(ScratchArgs, 1, StopTracking);
       S = getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, DoNothing);
     } else if (FName.startswith("NSLog")) {
diff --git a/test/Analysis/retain-release.m b/test/Analysis/retain-release.m
index a7845b7520..bb4a1d169d 100644
--- a/test/Analysis/retain-release.m
+++ b/test/Analysis/retain-release.m
@@ -2003,6 +2003,26 @@ static int Cond;
   [x release]; 
 }
 @end
+
+//===----------------------------------------------------------------------===//
+// <rdar://problem/13783514> xpc_connection_set_finalizer_f
+//===----------------------------------------------------------------------===//
+
+typedef xpc_object_t xpc_connection_t;
+typedef void (*xpc_finalizer_t)(void *value);
+void xpc_connection_set_context(xpc_connection_t connection, void *ctx);
+void xpc_connection_set_finalizer_f(xpc_connection_t connection,
+                                    xpc_finalizer_t finalizer);
+void releaseAfterXPC(void *context) {
+  [(NSArray *)context release];
+}
+
+void rdar13783514(xpc_connection_t connection) {
+  xpc_connection_set_context(connection, [[NSMutableArray alloc] init]);
+  xpc_connection_set_finalizer_f(connection, releaseAfterXPC);
+} // no-warning
+
+
 // CHECK:  <key>diagnostics</key>
 // CHECK-NEXT:  <array>
 // CHECK-NEXT:   <dict>