--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/type/ObjectStamp.java	2019-03-12 08:08:44.163239145 +0100
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/type/ObjectStamp.java	2019-03-12 08:08:43.795236751 +0100
@@ -31,6 +31,7 @@
 import jdk.vm.ci.meta.JavaConstant;
 import jdk.vm.ci.meta.MemoryAccessProvider;
 import jdk.vm.ci.meta.ResolvedJavaType;
+import jdk.vm.ci.meta.UnresolvedJavaType;
 
 public class ObjectStamp extends AbstractObjectStamp {
 
@@ -92,4 +93,48 @@
             return null;
         }
     }
+
+    /**
+     * Convert an ObjectStamp into a representation that can be resolved symbolically into the
+     * original stamp.
+     */
+    @Override
+    public SymbolicJVMCIReference<ObjectStamp> makeSymbolic() {
+        if (type() == null) {
+            return null;
+        }
+        return new SymbolicObjectStamp(this);
+    }
+
+    static class SymbolicObjectStamp implements SymbolicJVMCIReference<ObjectStamp> {
+        UnresolvedJavaType type;
+        private boolean exactType;
+        private boolean nonNull;
+        private boolean alwaysNull;
+
+        SymbolicObjectStamp(ObjectStamp stamp) {
+            if (stamp.type() != null) {
+                type = UnresolvedJavaType.create(stamp.type().getName());
+            }
+            exactType = stamp.isExactType();
+            nonNull = stamp.nonNull();
+            alwaysNull = stamp.alwaysNull();
+        }
+
+        @Override
+        public ObjectStamp resolve(ResolvedJavaType accessingClass) {
+            return new ObjectStamp(type != null ? type.resolve(accessingClass) : null, exactType, nonNull, alwaysNull);
+        }
+
+        @Override
+        public String toString() {
+            return "SymbolicObjectStamp{" +
+                            "declaringType=" + type +
+                            ", exactType=" + exactType +
+                            ", nonNull=" + nonNull +
+                            ", alwaysNull=" + alwaysNull +
+                            '}';
+        }
+    }
+
 }