Model Object.clone() in PTA for better precision for may-fail-cast

src/main/java/pascal/taie/analysis/pta/plugin/natives/NativeModeller.java

@@ -36,6 +36,7 @@ public void setSolver(Solver solver) {
         addPlugin(new ArrayModel.AnalysisModel(solver),
                 new ArrayModel.IRModel(solver),
                 new UnsafeModel(solver),
-                new DoPriviledgedModel(solver));
+                new DoPriviledgedModel(solver),
+                new ObjectModel(solver));
     }
 }

src/main/java/pascal/taie/analysis/pta/plugin/natives/ObjectModel.java

@@ -0,0 +1,48 @@
+/*
+ * Tai-e: A Static Analysis Framework for Java
+ *
+ * Copyright (C) 2022 Tian Tan <[email protected]>
+ * Copyright (C) 2022 Yue Li <[email protected]>
+ *
+ * This file is part of Tai-e.
+ *
+ * Tai-e is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation, either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * Tai-e is distributed in the hope that it will be useful,but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Tai-e. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package pascal.taie.analysis.pta.plugin.natives;
+
+import pascal.taie.analysis.pta.core.solver.Solver;
+import pascal.taie.analysis.pta.plugin.util.IRModelPlugin;
+import pascal.taie.analysis.pta.plugin.util.InvokeHandler;
+import pascal.taie.analysis.pta.plugin.util.InvokeUtils;
+import pascal.taie.ir.exp.Var;
+import pascal.taie.ir.stmt.Copy;
+import pascal.taie.ir.stmt.Invoke;
+import pascal.taie.ir.stmt.Stmt;
+
+import java.util.List;
+
+public class ObjectModel extends IRModelPlugin {
+    ObjectModel(Solver solver) {
+        super(solver);
+    }
+
+    @InvokeHandler(signature = "<java.lang.Object: java.lang.Object clone()>")
+    public List<Stmt> objectClone(Invoke invoke) {
+        Var result = invoke.getResult();
+        return result != null
+                ? List.of(new Copy(result, InvokeUtils.getVar(invoke, InvokeUtils.BASE)))
+                : List.of();
+    }
+}