Add class cycle detection during unmarshaling (#946)

Add support for detection of class cycles during unmarshaling in
languages which do no have garbage collection: C++, Swift, and Objective-C.
A `MarshalException` is thrown when a cycle is detected.

The property `Ice.AcceptClassCycles` can be set to a value greater than `0`
to change this behavior.

1 files changed, 17 insertions, 0 deletions

diff --git a/js/test/Ice/objects/Client.js b/js/test/Ice/objects/Client.js
index 0f5e5cb730b..76697dc3d17 100644
--- a/js/test/Ice/objects/Client.js
+++ b/js/test/Ice/objects/Client.js
@@ -491,6 +491,23 @@
             }
             out.writeLine("ok");
 
+            out.write("testing sending class cycle... ");
+            {
+                const rec = new Test.Recursive();
+                rec.v = rec;
+                const acceptsCycles = await initial.acceptsClassCycles();
+                try
+                {
+                    await initial.setCycle(rec);
+                    test(acceptsCycles);
+                }
+                catch (error)
+                {
+                    test(!acceptsCycles);
+                }
+            }
+            out.writeLine("ok");
+
             await initial.shutdown();
         }