--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/compiler/codecache/stress/Helper.java	Mon Jan 12 18:58:49 2015 +0300
@@ -0,0 +1,141 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+import java.io.BufferedInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.concurrent.Callable;
+import java.util.Random;
+
+import com.oracle.java.testlibrary.Asserts;
+import com.oracle.java.testlibrary.ByteCodeLoader;
+import com.oracle.java.testlibrary.InfiniteLoop;
+import com.oracle.java.testlibrary.Utils;
+import sun.hotspot.WhiteBox;
+
+public final class Helper {
+    public static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
+    public static final Random RNG = Utils.getRandomInstance();
+
+    private static final long THRESHOLD = WHITE_BOX.getIntxVMFlag("CompileThreshold");
+    private static final String TEST_CASE_IMPL_CLASS_NAME = "Helper$TestCaseImpl";
+    private static byte[] CLASS_DATA;
+    static {
+        try {
+            CLASS_DATA = loadClassData(TEST_CASE_IMPL_CLASS_NAME);
+        } catch (IOException e) {
+            throw new Error("TESTBUG: cannot load class byte code", e);
+        }
+    }
+
+    private Helper() {
+    }
+
+    public static void startInfiniteLoopThread(Runnable action) {
+        startInfiniteLoopThread(action, 0L);
+    }
+
+    public static void startInfiniteLoopThread(Runnable action, long millis) {
+        Thread t = new Thread(new InfiniteLoop(action, millis));
+        t.setDaemon(true);
+        t.start();
+    }
+
+    public static int callMethod(Callable<Integer> callable, int expected) {
+        int result = 0;
+        for (int i = 0; i < THRESHOLD; ++i) {
+            try {
+                result = callable.call();
+            } catch (Exception e) {
+                throw new AssertionError(
+                        "Exception occurred during test method execution", e);
+            }
+            Asserts.assertEQ(result, expected, "Method returns unexpected value");
+        }
+        return result;
+    }
+
+    private static byte[] loadClassData(String name) throws IOException {
+        try (BufferedInputStream in = new BufferedInputStream(
+                ClassLoader.getSystemResourceAsStream(name.replace(".", "/")
+                        + ".class"))) {
+            ByteArrayOutputStream result = new ByteArrayOutputStream();
+            byte[] buffer = new byte[1024];
+            int read;
+            while ((read = in.read(buffer)) != -1) {
+                result.write(buffer, 0, read);
+            }
+            return result.toByteArray();
+        }
+    }
+
+    public interface TestCase {
+
+        public static TestCase get() {
+            try {
+                Class clazz = ByteCodeLoader.load(
+                        TEST_CASE_IMPL_CLASS_NAME, CLASS_DATA);
+                return (TestCase) clazz.newInstance();
+            } catch (ReflectiveOperationException e) {
+                throw new Error(String.format(
+                        "TESTBUG: error while creating %s instance from reloaded class",
+                        TEST_CASE_IMPL_CLASS_NAME), e);
+            }
+        }
+
+        Callable<Integer> getCallable();
+        int method();
+        int expectedValue();
+    }
+
+    public static class TestCaseImpl implements TestCase {
+        private static final int RETURN_VALUE = 42;
+        private static final int RECURSION_DEPTH = 10;
+        private volatile int i;
+
+        @Override
+        public Callable<Integer> getCallable() {
+            return () -> {
+                i = 0;
+                return method();
+            };
+        }
+
+        @Override
+        public int method() {
+            ++i;
+            int result = RETURN_VALUE;
+            if (i < RECURSION_DEPTH) {
+                return result + method();
+            }
+            return result;
+        }
+
+        @Override
+        public int expectedValue() {
+            return RETURN_VALUE * RECURSION_DEPTH;
+        }
+    }
+
+}