8059575: JEP-JDK-8043304: Test task: Tiered Compilation level transition tests

Summary: Includes compile_id addition from JDK-8054492
Reviewed-by: andrew

src/share/vm/prims/whitebox.cpp

@@ -848,19 +848,23 @@ WB_ENTRY(jobjectArray, WB_GetNMethod(JNIEnv* env, jobject o, jobject method, jbo
   ThreadToNativeFromVM ttn(thread);
   jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
   CHECK_JNI_EXCEPTION_(env, NULL);
-  result = env->NewObjectArray(2, clazz, NULL);
+  result = env->NewObjectArray(3, clazz, NULL);
   if (result == NULL) {
     return result;
   }
 
-  jobject obj = integerBox(thread, env, code->comp_level());
+  jobject level = integerBox(thread, env, code->comp_level());
   CHECK_JNI_EXCEPTION_(env, NULL);
-  env->SetObjectArrayElement(result, 0, obj);
+  env->SetObjectArrayElement(result, 0, level);
+
+  jobject id = integerBox(thread, env, code->compile_id());
+  CHECK_JNI_EXCEPTION_(env, NULL);
+  env->SetObjectArrayElement(result, 1, id);
 
   jbyteArray insts = env->NewByteArray(insts_size);
   CHECK_JNI_EXCEPTION_(env, NULL);
   env->SetByteArrayRegion(insts, 0, insts_size, (jbyte*) code->insts_begin());
-  env->SetObjectArrayElement(result, 1, insts);
+  env->SetObjectArrayElement(result, 2, insts);
 
   return result;
 WB_END

test/compiler/tiered/ConstantGettersTransitionsTest.java

+/*
+ * 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.lang.reflect.Executable;
+import java.util.concurrent.Callable;
+
+/**
+ * @test ConstantGettersTransitionsTest
+ * @library /testlibrary /testlibrary/whitebox /compiler/whitebox
+ * @build TransitionsTestExecutor ConstantGettersTransitionsTest
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm/timeout=240 -Xmixed -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:+TieredCompilation
+ *                   -XX:CompileCommand=compileonly,ConstantGettersTestCase$TrivialMethods::*
+ *                   TransitionsTestExecutor ConstantGettersTransitionsTest
+ * @summary Test the correctness of compilation level transitions for constant getters methods
+ */
+public class ConstantGettersTransitionsTest extends LevelTransitionTest {
+    public static void main(String[] args) {
+        assert (!CompilerWhiteBoxTest.skipOnTieredCompilation(false));
+
+        // run test cases
+        for (TestCase testCase : ConstantGettersTestCase.values()) {
+            new ConstantGettersTransitionsTest(testCase).runTest();
+        }
+    }
+
+    @Override
+    protected boolean isTrivial() {
+        return true;
+    }
+
+    private ConstantGettersTransitionsTest(TestCase testCase) {
+        super(testCase);
+    }
+}
+
+enum ConstantGettersTestCase implements CompilerWhiteBoxTest.TestCase {
+    ICONST_M1,
+    ICONST_0,
+    ICONST_1,
+    ICONST_2,
+    ICONST_3,
+    ICONST_4,
+    ICONST_5,
+    LCONST_0,
+    LCONST_1,
+    FCONST_0,
+    FCONST_1,
+    FCONST_2,
+    DCONST_0,
+    DCONST_1,
+    DCONST_W,
+    BYTE,
+    SHORT,
+    CHAR;
+
+    private final Executable executable;
+    private final Callable<Integer> callable;
+
+    @Override
+    public Executable getExecutable() {
+        return executable;
+    }
+
+    @Override
+    public Callable<Integer> getCallable() {
+        return callable;
+    }
+
+    @Override
+    public boolean isOsr() {
+        return false;
+    }
+
+    private ConstantGettersTestCase() {
+        String name = "make" + this.name();
+        this.executable = LevelTransitionTest.Helper.getMethod(TrivialMethods.class, name);
+        this.callable = LevelTransitionTest.Helper.getCallable(new TrivialMethods(), name);
+    }
+
+    /**
+     * Contains methods that load constants with certain types of bytecodes
+     * See JVMS 2.11.2. Load and Store Instructions
+     * Note that it doesn't have a method for ldc_w instruction
+     */
+    private static class TrivialMethods {
+        public static int makeICONST_M1() {
+            return -1;
+        }
+
+        public static int makeICONST_0() {
+            return 0;
+        }
+
+        public static int makeICONST_1() {
+            return 1;
+        }
+
+        public static int makeICONST_2() {
+            return 2;
+        }
+
+        public static int makeICONST_3() {
+            return 3;
+        }
+
+        public static int makeICONST_4() {
+            return 4;
+        }
+
+        public static int makeICONST_5() {
+            return 5;
+        }
+
+        public static long makeLCONST_0() {
+            return 0L;
+        }
+
+        public static long makeLCONST_1() {
+            return 1L;
+        }
+
+        public static float makeFCONST_0() {
+            return 0F;
+        }
+
+        public static float makeFCONST_1() {
+            return 1F;
+        }
+
+        public static float makeFCONST_2() {
+            return 2F;
+        }
+
+        public static double makeDCONST_0() {
+            return 0D;
+        }
+
+        public static double makeDCONST_1() {
+            return 1D;
+        }
+
+        public static double makeDCONST_W() {
+            // ldc2_w
+            return Double.MAX_VALUE;
+        }
+
+        public static Object makeOBJECT() {
+            // aconst_null
+            return null;
+        }
+
+        public static byte makeBYTE() {
+            // bipush
+            return (byte) 0x7F;
+        }
+
+        public static short makeSHORT() {
+            // sipush
+            return (short) 0x7FFF;
+        }
+
+        public static char makeCHAR() {
+            // ldc
+            return (char) 0xFFFF;
+        }
+
+        public static boolean makeBOOLEAN() {
+            return true;
+        }
+    }
+}

test/compiler/tiered/LevelTransitionTest.java

+/*
+ * 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.lang.reflect.Executable;
+import java.lang.reflect.Method;
+import java.util.Objects;
+import java.util.concurrent.Callable;
+
+/**
+ * @test LevelTransitionTest
+ * @library /testlibrary /testlibrary/whitebox /compiler/whitebox
+ * @build TransitionsTestExecutor LevelTransitionTest
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm/timeout=240 -Xmixed -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
+ *                   -XX:+WhiteBoxAPI -XX:+TieredCompilation
+ *                   -XX:CompileCommand=compileonly,SimpleTestCase$Helper::*
+ *                   -XX:CompileCommand=compileonly,ExtendedTestCase$CompileMethodHolder::*
+ *                   TransitionsTestExecutor LevelTransitionTest
+ * @summary Test the correctness of compilation level transitions for different methods
+ */
+public class LevelTransitionTest extends TieredLevelsTest {
+    /** Shows if method was profiled by being executed on levels 2 or 3 */
+    protected boolean isMethodProfiled;
+    private int transitionCount;
+
+    public static void main(String[] args) throws Throwable {
+        assert (!CompilerWhiteBoxTest.skipOnTieredCompilation(false));
+
+        CompilerWhiteBoxTest.main(LevelTransitionTest::new, args);
+        // run extended test cases
+        for (TestCase testCase : ExtendedTestCase.values()) {
+            new LevelTransitionTest(testCase).runTest();
+        }
+    }
+
+    protected LevelTransitionTest(TestCase testCase) {
+        super(testCase);
+        isMethodProfiled = testCase.isOsr(); // OSR methods were already profiled by warmup
+        transitionCount = 0;
+    }
+
+    @Override
+    protected void test() throws Exception {
+        checkTransitions();
+        deoptimize();
+        printInfo();
+        if (testCase.isOsr()) {
+            // deoptimization makes the following transitions be unstable
+            // methods go to level 3 before 4 because of uncommon_trap and reprofile
+            return;
+        }
+        checkTransitions();
+    }
+
+    /**
+     * Makes and verifies transitions between compilation levels
+     */
+    protected void checkTransitions() {
+        checkNotCompiled();
+        boolean finish = false;
+        while (!finish) {
+            System.out.printf("Level transition #%d%n", ++transitionCount);
+            int newLevel;
+            int current = getCompLevel();
+            int expected = getNextLevel(current);
+            if (current == expected) {
+                // if we are on expected level, just execute it more
+                // to ensure that the level won't change
+                System.out.printf("Method %s is already on expected level %d%n", method, expected);
+                compile();
+                newLevel = getCompLevel();
+                finish = true;
+            } else {
+                newLevel = changeCompLevel();
+                finish = false;
+            }
+            System.out.printf("Method %s is compiled on level %d. Expected level is %d%n", method, newLevel, expected);
+            checkLevel(expected, newLevel);
+            printInfo();
+        };
+    }
+
+    /**
+     * Gets next expected level for the test case on each transition.
+     *
+     * @param currentLevel a level the test case is compiled on
+     * @return expected compilation level
+     */
+    protected int getNextLevel(int currentLevel) {
+        int nextLevel = currentLevel;
+        switch (currentLevel) {
+            case CompilerWhiteBoxTest.COMP_LEVEL_NONE:
+                nextLevel = isMethodProfiled ? CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION
+                        : CompilerWhiteBoxTest.COMP_LEVEL_FULL_PROFILE;
+                break;
+            case CompilerWhiteBoxTest.COMP_LEVEL_LIMITED_PROFILE:
+            case CompilerWhiteBoxTest.COMP_LEVEL_FULL_PROFILE:
+                nextLevel = CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION;
+                isMethodProfiled = true;
+                break;
+        }
+        nextLevel = isTrivial() ? CompilerWhiteBoxTest.COMP_LEVEL_SIMPLE : nextLevel;
+        return Math.min(nextLevel, CompilerWhiteBoxTest.TIERED_STOP_AT_LEVEL);
+    }
+
+    /**
+     * Determines if tested method should be handled as trivial
+     *
+     * @return {@code true} for trivial methods, {@code false} otherwise
+     */
+    protected boolean isTrivial() {
+        return testCase == ExtendedTestCase.ACCESSOR_TEST
+                || testCase == SimpleTestCase.METHOD_TEST
+                || testCase == SimpleTestCase.STATIC_TEST
+                || (testCase == ExtendedTestCase.TRIVIAL_CODE_TEST && isMethodProfiled);
+    }
+
+    /**
+     * Invokes {@linkplain #method} until its compilation level is changed.
+     * Note that if the level won't change, it will be an endless loop
+     *
+     * @return compilation level the {@linkplain #method} was compiled on
+     */
+    protected int changeCompLevel() {
+        int currentLevel = getCompLevel();
+        int newLevel = currentLevel;
+        int result = 0;
+        while (currentLevel == newLevel) {
+            result = compile(1);
+            if (WHITE_BOX.isMethodCompiled(method, testCase.isOsr())) {
+                newLevel = getCompLevel();
+            }
+        }
+        return newLevel;
+    }
+
+    protected static class Helper {
+        /**
+         * Gets method from a specified class using its name
+         *
+         * @param aClass type method belongs to
+         * @param name   the name of the method
+         * @return {@link Method} that represents corresponding class method
+         */
+        public static Method getMethod(Class<?> aClass, String name) {
+            Method method;
+            try {
+                method = aClass.getDeclaredMethod(name);
+            } catch (NoSuchMethodException e) {
+                throw new Error("TESTBUG: Unable to get method " + name, e);
+            }
+            return method;
+        }
+
+        /**
+         * Gets {@link Callable} that invokes given method from the given object
+         *
+         * @param object the object the specified method is invoked from
+         * @param name   the name of the method
+         */
+        public static Callable<Integer> getCallable(Object object, String name) {
+            Method method = getMethod(object.getClass(), name);
+            return () -> {
+                try {
+                    return Objects.hashCode(method.invoke(object));
+                } catch (ReflectiveOperationException e) {
+                    throw new Error("TESTBUG: Invocation failure", e);
+                }
+            };
+        }
+    }
+}
+
+enum ExtendedTestCase implements CompilerWhiteBoxTest.TestCase {
+    ACCESSOR_TEST("accessor"),
+    NONTRIVIAL_METHOD_TEST("nonTrivialMethod"),
+    TRIVIAL_CODE_TEST("trivialCode");
+
+    private final Executable executable;
+    private final Callable<Integer> callable;
+
+    @Override
+    public Executable getExecutable() {
+        return executable;
+    }
+
+    @Override
+    public Callable<Integer> getCallable() {
+        return callable;
+    }
+
+    @Override
+    public boolean isOsr() {
+        return false;
+    }
+
+    private ExtendedTestCase(String methodName) {
+        this.executable = LevelTransitionTest.Helper.getMethod(CompileMethodHolder.class, methodName);
+        this.callable = LevelTransitionTest.Helper.getCallable(new CompileMethodHolder(), methodName);
+    }
+
+    private static class CompileMethodHolder {
+        private final int iter = 10;
+        private int field = 42;
+
+        /** Non-trivial method for threshold policy: contains loops */
+        public int nonTrivialMethod() {
+            int acc = 0;
+            for (int i = 0; i < iter; i++) {
+                acc += i;
+            }
+            return acc;
+        }
+
+        /** Field accessor method */
+        public int accessor() {
+            return field;
+        }
+
+        /** Method considered as trivial by amount of code */
+        public int trivialCode() {
+            int var = 0xBAAD_C0DE;
+            var *= field;
+            return var;
+        }
+    }
+}

test/compiler/tiered/NonTieredLevelsTest.java

@@ -54,9 +54,7 @@ public class NonTieredLevelsTest extends CompLevelsTest {
 
     }
     public static void main(String[] args) throws Exception {
-        if (TIERED_COMPILATION) {
-            System.err.println("Test isn't applicable w/ enabled "
-                    + "TieredCompilation. Skip test.");
+        if (CompilerWhiteBoxTest.skipOnTieredCompilation(true)) {
             return;
         }
         CompilerWhiteBoxTest.main(NonTieredLevelsTest::new, args);

test/compiler/tiered/TieredLevelsTest.java

@@ -34,16 +34,14 @@
  * @author igor.ignatyev@oracle.com
  */
 public class TieredLevelsTest extends CompLevelsTest {
-    public static void main(String[] args) throws Exception {
-        if (!TIERED_COMPILATION) {
-            System.err.println("Test isn't applicable w/ disabled "
-                    + "TieredCompilation. Skip test.");
+    public static void main(String[] args) throws Exception, Throwable {
+        if (CompilerWhiteBoxTest.skipOnTieredCompilation(false)) {
             return;
         }
         CompilerWhiteBoxTest.main(TieredLevelsTest::new, args);
     }
 
-    private TieredLevelsTest(TestCase testCase) {
+    protected TieredLevelsTest(TestCase testCase) {
         super(testCase);
         // to prevent inlining of #method
         WHITE_BOX.testSetDontInlineMethod(method, true);
@@ -76,14 +74,18 @@ public class TieredLevelsTest extends CompLevelsTest {
         }
     }
 
-
     @Override
     protected void checkLevel(int expected, int actual) {
         if (expected == COMP_LEVEL_FULL_PROFILE
                 && actual == COMP_LEVEL_LIMITED_PROFILE) {
             // for simple method full_profile may be replaced by limited_profile
+            if (IS_VERBOSE) {
+                System.out.printf("Level check: full profiling was replaced "
+                        + "by limited profiling. Expected: %d, actual:%d",
+                        expected, actual);
+            }
             return;
         }
         super.checkLevel(expected, actual);
-   }
+    }
 }

test/compiler/tiered/TransitionsTestExecutor.java

+/*
+ * 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 com.oracle.java.testlibrary.OutputAnalyzer;
+import com.oracle.java.testlibrary.ProcessTools;
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.RuntimeMXBean;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Executes given test in a separate VM with enabled Tiered Compilation for
+ * CompilationPolicyChoice 2 and 3
+ */
+public class TransitionsTestExecutor {
+    public static void main(String[] args) throws Throwable {
+        if (CompilerWhiteBoxTest.skipOnTieredCompilation(false)) {
+            return;
+        }
+        if (args.length != 1) {
+            throw new Error("TESTBUG: Test name should be specified");
+        }
+        executeTestFor(2, args[0]);
+        executeTestFor(3, args[0]);
+    }
+
+    private static void executeTestFor(int compilationPolicy, String testName) throws Throwable {
+        String policy = "-XX:CompilationPolicyChoice=" + compilationPolicy;
+
+        // Get runtime arguments including VM options given to this executor
+        RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
+        List<String> vmArgs = runtime.getInputArguments();
+
+        // Construct execution command with compilation policy choice and test name
+        List<String> args = new ArrayList<>(vmArgs);
+        Collections.addAll(args, policy, testName);
+
+        OutputAnalyzer out = ProcessTools.executeTestJvm(args.toArray(new String[args.size()]));
+        int exitCode = out.getExitValue();
+        if (exitCode != 0) {
+            throw new Error("Test execution failed with exit code " + exitCode);
+        }
+    }
+}

test/compiler/whitebox/CompilerWhiteBoxTest.java

@@ -41,19 +41,19 @@ import java.util.function.Function;
  */
 public abstract class CompilerWhiteBoxTest {
     /** {@code CompLevel::CompLevel_none} -- Interpreter */
-    protected static int COMP_LEVEL_NONE = 0;
+    protected static final int COMP_LEVEL_NONE = 0;
     /** {@code CompLevel::CompLevel_any}, {@code CompLevel::CompLevel_all} */
-    protected static int COMP_LEVEL_ANY = -1;
+    protected static final int COMP_LEVEL_ANY = -1;
     /** {@code CompLevel::CompLevel_simple} -- C1 */
-    protected static int COMP_LEVEL_SIMPLE = 1;
+    protected static final int COMP_LEVEL_SIMPLE = 1;
     /** {@code CompLevel::CompLevel_limited_profile} -- C1, invocation & backedge counters */
-    protected static int COMP_LEVEL_LIMITED_PROFILE = 2;
+    protected static final int COMP_LEVEL_LIMITED_PROFILE = 2;
     /** {@code CompLevel::CompLevel_full_profile} -- C1, invocation & backedge counters + mdo */
-    protected static int COMP_LEVEL_FULL_PROFILE = 3;
+    protected static final int COMP_LEVEL_FULL_PROFILE = 3;
     /** {@code CompLevel::CompLevel_full_optimization} -- C2 or Shark */
-    protected static int COMP_LEVEL_FULL_OPTIMIZATION = 4;
+    protected static final int COMP_LEVEL_FULL_OPTIMIZATION = 4;
     /** Maximal value for CompLevel */
-    protected static int COMP_LEVEL_MAX = COMP_LEVEL_FULL_OPTIMIZATION;
+    protected static final int COMP_LEVEL_MAX = COMP_LEVEL_FULL_OPTIMIZATION;
 
     /** Instance of WhiteBox */
     protected static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
@@ -347,14 +347,22 @@ public abstract class CompilerWhiteBoxTest {
         System.out.printf("%n%s:%n", method);
         System.out.printf("\tcompilable:\t%b%n",
                 WHITE_BOX.isMethodCompilable(method, COMP_LEVEL_ANY, false));
-        System.out.printf("\tcompiled:\t%b%n",
-                WHITE_BOX.isMethodCompiled(method, false));
+        boolean isCompiled = WHITE_BOX.isMethodCompiled(method, false);
+        System.out.printf("\tcompiled:\t%b%n", isCompiled);
+        if (isCompiled) {
+            System.out.printf("\tcompile_id:\t%d%n",
+                    NMethod.get(method, false).compile_id);
+        }
         System.out.printf("\tcomp_level:\t%d%n",
                 WHITE_BOX.getMethodCompilationLevel(method, false));
         System.out.printf("\tosr_compilable:\t%b%n",
                 WHITE_BOX.isMethodCompilable(method, COMP_LEVEL_ANY, true));
-        System.out.printf("\tosr_compiled:\t%b%n",
-                WHITE_BOX.isMethodCompiled(method, true));
+        isCompiled = WHITE_BOX.isMethodCompiled(method, true);
+        System.out.printf("\tosr_compiled:\t%b%n", isCompiled);
+        if (isCompiled) {
+            System.out.printf("\tosr_compile_id:\t%d%n",
+                    NMethod.get(method, true).compile_id);
+        }
         System.out.printf("\tosr_comp_level:\t%d%n",
                 WHITE_BOX.getMethodCompilationLevel(method, true));
         System.out.printf("\tin_queue:\t%b%n",
@@ -437,6 +445,22 @@ public abstract class CompilerWhiteBoxTest {
         }
         return result;
     }
+
+    /**
+     * Skip the test for the specified value of Tiered Compilation
+     * @param value of TieredCompilation the test should not run with
+     * @return {@code true} if the test should be skipped,
+     *         {@code false} otherwise
+     */
+    protected static boolean skipOnTieredCompilation(boolean value) {
+        if (value == CompilerWhiteBoxTest.TIERED_COMPILATION) {
+            System.err.println("Test isn't applicable w/ "
+                    + (value ? "enabled" : "disabled")
+                    + "TieredCompilation. Skip test.");
+            return true;
+        }
+        return false;
+    }
 }
 
 enum SimpleTestCase implements CompilerWhiteBoxTest.TestCase {

test/testlibrary/whitebox/sun/hotspot/code/NMethod.java

@@ -34,18 +34,21 @@ public class NMethod {
     return obj == null ? null : new NMethod(obj);
   }
   private NMethod(Object[] obj) {
-    assert obj.length == 2;
+    assert obj.length == 3;
     comp_level = (Integer) obj[0];
-    insts = (byte[]) obj[1];
+    compile_id = (Integer) obj[1];
+    insts = (byte[]) obj[2];
   }
-  public byte[] insts;
-  public int comp_level;
+  public final byte[] insts;
+  public final int comp_level;
+  public final int compile_id;
 
   @Override
   public String toString() {
     return "NMethod{" +
         "insts=" + insts +
         ", comp_level=" + comp_level +
+        ", compile_id=" + compile_id +
         '}';
   }
 }