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 /*

  * Copyright (c) 2013, 2018, 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.sun.management.HotSpotDiagnosticMXBean;

 import com.sun.management.VMOption;

 import sun.hotspot.WhiteBox;

 import sun.hotspot.code.NMethod;

 import sun.management.ManagementFactoryHelper;

 import java.lang.reflect.Constructor;

 import java.lang.reflect.Executable;

 import java.lang.reflect.Method;

 import java.util.Objects;

 import java.util.concurrent.Callable;

 import java.util.function.Function;

 /**

  * Abstract class for WhiteBox testing of JIT.

  *

  * @author igor.ignatyev@oracle.com

  */

 public abstract class CompilerWhiteBoxTest {

     /** {@code CompLevel::CompLevel_none} -- Interpreter */

     protected static int COMP_LEVEL_NONE = 0;

     /** {@code CompLevel::CompLevel_any}, {@code CompLevel::CompLevel_all} */

     protected static int COMP_LEVEL_ANY = -1;

     /** {@code CompLevel::CompLevel_simple} -- C1 */

     protected static int COMP_LEVEL_SIMPLE = 1;

     /** {@code CompLevel::CompLevel_limited_profile} -- C1, invocation & backedge counters */

     protected static int COMP_LEVEL_LIMITED_PROFILE = 2;

     /** {@code CompLevel::CompLevel_full_profile} -- C1, invocation & backedge counters + mdo */

     protected static int COMP_LEVEL_FULL_PROFILE = 3;

     /** {@code CompLevel::CompLevel_full_optimization} -- C2 or Shark */

     protected static int COMP_LEVEL_FULL_OPTIMIZATION = 4;

     /** Maximal value for CompLevel */

     protected static int COMP_LEVEL_MAX = COMP_LEVEL_FULL_OPTIMIZATION;

     /** Instance of WhiteBox */

     protected static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();

     /** Value of {@code -XX:CompileThreshold} */

     protected static final int COMPILE_THRESHOLD

             = Integer.parseInt(getVMOption("CompileThreshold", "10000"));

     /** Value of {@code -XX:BackgroundCompilation} */

     protected static final boolean BACKGROUND_COMPILATION

             = Boolean.valueOf(getVMOption("BackgroundCompilation", "true"));

     /** Value of {@code -XX:TieredCompilation} */

     protected static final boolean TIERED_COMPILATION

             = Boolean.valueOf(getVMOption("TieredCompilation", "false"));

     /** Value of {@code -XX:TieredStopAtLevel} */

     protected static final int TIERED_STOP_AT_LEVEL

             = Integer.parseInt(getVMOption("TieredStopAtLevel", "0"));

     /** Flag for verbose output, true if {@code -Dverbose} specified */

     protected static final boolean IS_VERBOSE

             = System.getProperty("verbose") != null;

     /** invocation count to trigger compilation */

     protected static final int THRESHOLD;

     /** invocation count to trigger OSR compilation */

     protected static final long BACKEDGE_THRESHOLD;

     /** Value of {@code java.vm.info} (interpreted|mixed|comp mode) */

     protected static final String MODE = System.getProperty("java.vm.info");

     static {

         if (TIERED_COMPILATION) {

             BACKEDGE_THRESHOLD = THRESHOLD = 150000;

         } else {

             THRESHOLD = COMPILE_THRESHOLD;

             BACKEDGE_THRESHOLD = Math.max(10000, COMPILE_THRESHOLD *

                     Long.parseLong(getVMOption("OnStackReplacePercentage")));

         }

     }

     /**

      * Returns value of VM option.

      *

      * @param name option's name

      * @return value of option or {@code null}, if option doesn't exist

      * @throws NullPointerException if name is null

      */

     protected static String getVMOption(String name) {

         Objects.requireNonNull(name);

         HotSpotDiagnosticMXBean diagnostic

                 = ManagementFactoryHelper.getDiagnosticMXBean();

         VMOption tmp;

         try {

             tmp = diagnostic.getVMOption(name);

         } catch (IllegalArgumentException e) {

             tmp = null;

         }

         return (tmp == null ? null : tmp.getValue());

     }

     /**

      * Returns value of VM option or default value.

      *

      * @param name         option's name

      * @param defaultValue default value

      * @return value of option or {@code defaultValue}, if option doesn't exist

      * @throws NullPointerException if name is null

      * @see #getVMOption(String)

      */

     protected static String getVMOption(String name, String defaultValue) {

         String result = getVMOption(name);

         return result == null ? defaultValue : result;

     }

     /** copy of is_c1_compile(int) from utilities/globalDefinitions.hpp */

     protected static boolean isC1Compile(int compLevel) {

         return (compLevel > COMP_LEVEL_NONE)

                 && (compLevel < COMP_LEVEL_FULL_OPTIMIZATION);

     }

     /** copy of is_c2_compile(int) from utilities/globalDefinitions.hpp */

     protected static boolean isC2Compile(int compLevel) {

         return compLevel == COMP_LEVEL_FULL_OPTIMIZATION;

     }

     protected static void main(

             Function<TestCase, CompilerWhiteBoxTest> constructor,

             String[] args) {

         if (args.length == 0) {

             for (TestCase test : SimpleTestCase.values()) {

                 constructor.apply(test).runTest();

             }

         } else {

             for (String name : args) {

                 constructor.apply(SimpleTestCase.valueOf(name)).runTest();

             }

         }

     }

     /** tested method */

     protected final Executable method;

     protected final TestCase testCase;

     /**

      * Constructor.

      *

      * @param testCase object, that contains tested method and way to invoke it.

      */

     protected CompilerWhiteBoxTest(TestCase testCase) {

         Objects.requireNonNull(testCase);

         System.out.println("TEST CASE:" + testCase.name());

         method = testCase.getExecutable();

         this.testCase = testCase;

     }

     /**

      * Template method for testing. Prints tested method's info before

      * {@linkplain #test()} and after {@linkplain #test()} or on thrown

      * exception.

      *

      * @throws RuntimeException if method {@linkplain #test()} throws any

      *                          exception

      * @see #test()

      */

     protected final void runTest() {

         if (ManagementFactoryHelper.getCompilationMXBean() == null) {

             System.err.println(

                     "Warning: test is not applicable in interpreted mode");

             return;

         }

         System.out.println("at test's start:");

         printInfo();

         try {

             test();

         } catch (Exception e) {

             System.out.printf("on exception '%s':", e.getMessage());

             printInfo();

             e.printStackTrace();

             if (e instanceof RuntimeException) {

                 throw (RuntimeException) e;

             }

             throw new RuntimeException(e);

         }

         System.out.println("at test's end:");

         printInfo();

     }

     /**

      * Checks, that {@linkplain #method} is not compiled at the given compilation

      * level or above.

      *

      * @param compLevel

      *

      * @throws RuntimeException if {@linkplain #method} is in compiler queue or

      *                          is compiled, or if {@linkplain #method} has zero

      *                          compilation level.

      */

     protected final void checkNotCompiled(int compLevel) {

         if (WHITE_BOX.isMethodQueuedForCompilation(method)) {

             throw new RuntimeException(method + " must not be in queue");

         }

         if (WHITE_BOX.getMethodCompilationLevel(method, false) >= compLevel) {

             throw new RuntimeException(method + " comp_level must be >= maxCompLevel");

         }

         if (WHITE_BOX.getMethodCompilationLevel(method, true) >= compLevel) {

             throw new RuntimeException(method + " osr_comp_level must be >= maxCompLevel");

         }

     }

     /**

      * Checks, that {@linkplain #method} is not compiled.

      *

      * @throws RuntimeException if {@linkplain #method} is in compiler queue or

      *                          is compiled, or if {@linkplain #method} has zero

      *                          compilation level.

      */

     protected final void checkNotCompiled() {

         checkNotCompiled(true);

         checkNotCompiled(false);

     }

     /**

      * Checks, that {@linkplain #method} is not (OSR-)compiled.

      *

      * @param isOsr Check for OSR compilation if true

      * @throws RuntimeException if {@linkplain #method} is in compiler queue or

      *                          is compiled, or if {@linkplain #method} has zero

      *                          compilation level.

      */

     protected final void checkNotCompiled(boolean isOsr) {

         waitBackgroundCompilation();

         if (WHITE_BOX.isMethodQueuedForCompilation(method)) {

             throw new RuntimeException(method + " must not be in queue");

         }

         if (WHITE_BOX.isMethodCompiled(method, isOsr)) {

             throw new RuntimeException(method + " must not be " +

                                        (isOsr ? "osr_" : "") + "compiled");

         }

         if (WHITE_BOX.getMethodCompilationLevel(method, isOsr) != 0) {

             throw new RuntimeException(method + (isOsr ? " osr_" : " ") +

                                        "comp_level must be == 0");

         }

     }

     /**

      * Checks, that {@linkplain #method} is compiled.

      *

      * @throws RuntimeException if {@linkplain #method} isn't in compiler queue

      *                          and isn't compiled, or if {@linkplain #method}

      *                          has nonzero compilation level

      */

     protected final void checkCompiled() {

         final long start = System.currentTimeMillis();

         waitBackgroundCompilation();

         if (WHITE_BOX.isMethodQueuedForCompilation(method)) {

             System.err.printf("Warning: %s is still in queue after %dms%n",

                     method, System.currentTimeMillis() - start);

             return;

         }

         if (!WHITE_BOX.isMethodCompiled(method, testCase.isOsr())) {

             throw new RuntimeException(method + " must be "

                     + (testCase.isOsr() ? "osr_" : "") + "compiled");

         }

         if (WHITE_BOX.getMethodCompilationLevel(method, testCase.isOsr())

                 == 0) {

             throw new RuntimeException(method

                     + (testCase.isOsr() ? " osr_" : " ")

                     + "comp_level must be != 0");

         }

     }

     protected final void deoptimize() {

         WHITE_BOX.deoptimizeMethod(method, testCase.isOsr());

         if (testCase.isOsr()) {

             WHITE_BOX.deoptimizeMethod(method, false);

         }

     }

     protected final int getCompLevel() {

         NMethod nm = NMethod.get(method, testCase.isOsr());

         return nm == null ? COMP_LEVEL_NONE : nm.comp_level;

     }

     protected final boolean isCompilable() {

         return WHITE_BOX.isMethodCompilable(method, COMP_LEVEL_ANY,

                 testCase.isOsr());

     }

     protected final boolean isCompilable(int compLevel) {

         return WHITE_BOX

                 .isMethodCompilable(method, compLevel, testCase.isOsr());

     }

     protected final void makeNotCompilable() {

         WHITE_BOX.makeMethodNotCompilable(method, COMP_LEVEL_ANY,

                 testCase.isOsr());

     }

     protected final void makeNotCompilable(int compLevel) {

         WHITE_BOX.makeMethodNotCompilable(method, compLevel, testCase.isOsr());

     }

     /**

      * Waits for completion of background compilation of {@linkplain #method}.

      */

     protected final void waitBackgroundCompilation() {

         waitBackgroundCompilation(method);

     }

     /**

      * Waits for completion of background compilation of the given executable.

      *

      * @param executable Executable

      */

     protected static final void waitBackgroundCompilation(Executable executable) {

         if (!BACKGROUND_COMPILATION) {

             return;

         }

         final Object obj = new Object();

         for (int i = 0; i < 10

                 && WHITE_BOX.isMethodQueuedForCompilation(executable); ++i) {

             synchronized (obj) {

                 try {

                     obj.wait(1000);

                 } catch (InterruptedException e) {

                     Thread.currentThread().interrupt();

                 }

             }

         }

     }

     /**

      * Prints information about {@linkplain #method}.

      */

     protected final void printInfo() {

         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));

         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));

         System.out.printf("\tosr_comp_level:\t%d%n",

                 WHITE_BOX.getMethodCompilationLevel(method, true));

         System.out.printf("\tin_queue:\t%b%n",

                 WHITE_BOX.isMethodQueuedForCompilation(method));

         System.out.printf("compile_queues_size:\t%d%n%n",

                 WHITE_BOX.getCompileQueuesSize());

     }

     /**

      * Executes testing.

      */

     protected abstract void test() throws Exception;

     /**

      * Tries to trigger compilation of {@linkplain #method} by call

      * {@linkplain TestCase#getCallable()} enough times.

      *

      * @return accumulated result

      * @see #compile(int)

      */

     protected final int compile() {

         if (testCase.isOsr()) {

             return compile(1);

         } else {

             return compile(THRESHOLD);

         }

     }

     /**

      * Tries to trigger compilation of {@linkplain #method} by call

      * {@linkplain TestCase#getCallable()} specified times.

      *

      * @param count invocation count

      * @return accumulated result

      */

     protected final int compile(int count) {

         int result = 0;

         Integer tmp;

         for (int i = 0; i < count; ++i) {

             try {

                 tmp = testCase.getCallable().call();

             } catch (Exception e) {

                 tmp = null;

             }

             result += tmp == null ? 0 : tmp;

         }

         if (IS_VERBOSE) {

             System.out.println("method was invoked " + count + " times");

         }

         return result;

     }

     /**

      * Utility interface provides tested method and object to invoke it.

      */

     public interface TestCase {

         /** the name of test case */

         String name();

         /** tested method */

         Executable getExecutable();

         /** object to invoke {@linkplain #getExecutable()} */

         Callable<Integer> getCallable();

         /** flag for OSR test case */

         boolean isOsr();

     }

     /**

      * @return {@code true} if the current test case is OSR and the mode is

      *          Xcomp, otherwise {@code false}

      */

     protected boolean skipXcompOSR() {

         boolean result =  testCase.isOsr()

                 && CompilerWhiteBoxTest.MODE.startsWith("compiled ");

         if (result && IS_VERBOSE) {

             System.err.printf("Warning: %s is not applicable in %s%n",

                     testCase.name(), CompilerWhiteBoxTest.MODE);

         }

         return result;

     }

 }

 enum SimpleTestCase implements CompilerWhiteBoxTest.TestCase {

     /** constructor test case */

     CONSTRUCTOR_TEST(Helper.CONSTRUCTOR, Helper.CONSTRUCTOR_CALLABLE, false),

     /** method test case */

     METHOD_TEST(Helper.METHOD, Helper.METHOD_CALLABLE, false),

     /** static method test case */

     STATIC_TEST(Helper.STATIC, Helper.STATIC_CALLABLE, false),

     /** OSR constructor test case */

     OSR_CONSTRUCTOR_TEST(Helper.OSR_CONSTRUCTOR,

             Helper.OSR_CONSTRUCTOR_CALLABLE, true),

     /** OSR method test case */

     OSR_METHOD_TEST(Helper.OSR_METHOD, Helper.OSR_METHOD_CALLABLE, true),

     /** OSR static method test case */

     OSR_STATIC_TEST(Helper.OSR_STATIC, Helper.OSR_STATIC_CALLABLE, true);

     private final Executable executable;

     private final Callable<Integer> callable;

     private final boolean isOsr;

     private SimpleTestCase(Executable executable, Callable<Integer> callable,

             boolean isOsr) {

         this.executable = executable;

         this.callable = callable;

         this.isOsr = isOsr;

     }

     @Override

     public Executable getExecutable() {

         return executable;

     }

     @Override

     public Callable<Integer> getCallable() {

         return callable;

     }

     @Override

     public boolean isOsr() {

         return isOsr;

     }

     private static class Helper {

         private static final Callable<Integer> CONSTRUCTOR_CALLABLE

                 = new Callable<Integer>() {

             @Override

             public Integer call() throws Exception {

                 return new Helper(1337).hashCode();

             }

         };

         private static final Callable<Integer> METHOD_CALLABLE

                 = new Callable<Integer>() {

             private final Helper helper = new Helper();

             @Override

             public Integer call() throws Exception {

                 return helper.method();

             }

         };

         private static final Callable<Integer> STATIC_CALLABLE

                 = new Callable<Integer>() {

             @Override

             public Integer call() throws Exception {

                 return staticMethod();

             }

         };

         private static final Callable<Integer> OSR_CONSTRUCTOR_CALLABLE

                 = new Callable<Integer>() {

             @Override

             public Integer call() throws Exception {

                 return new Helper(null, CompilerWhiteBoxTest.BACKEDGE_THRESHOLD).hashCode();

             }

         };

         private static final Callable<Integer> OSR_METHOD_CALLABLE

                 = new Callable<Integer>() {

             private final Helper helper = new Helper();

             @Override

             public Integer call() throws Exception {

                 return helper.osrMethod(CompilerWhiteBoxTest.BACKEDGE_THRESHOLD);

             }

         };

         private static final Callable<Integer> OSR_STATIC_CALLABLE

                 = new Callable<Integer>() {

             @Override

             public Integer call() throws Exception {

                 return osrStaticMethod(CompilerWhiteBoxTest.BACKEDGE_THRESHOLD);

             }

         };

         private static final Constructor CONSTRUCTOR;

         private static final Constructor OSR_CONSTRUCTOR;

         private static final Method METHOD;

         private static final Method STATIC;

         private static final Method OSR_METHOD;

         private static final Method OSR_STATIC;

         static {

             try {

                 CONSTRUCTOR = Helper.class.getDeclaredConstructor(int.class);

             } catch (NoSuchMethodException | SecurityException e) {

                 throw new RuntimeException(

                         "exception on getting method Helper.<init>(int)", e);

             }

             try {

                 OSR_CONSTRUCTOR = Helper.class.getDeclaredConstructor(

                         Object.class, long.class);

             } catch (NoSuchMethodException | SecurityException e) {

                 throw new RuntimeException(

                         "exception on getting method Helper.<init>(Object, long)", e);

             }

             METHOD = getMethod("method");

             STATIC = getMethod("staticMethod");

             OSR_METHOD = getMethod("osrMethod", long.class);

             OSR_STATIC = getMethod("osrStaticMethod", long.class);

         }

         private static Method getMethod(String name, Class<?>... parameterTypes) {

             try {

                 return Helper.class.getDeclaredMethod(name, parameterTypes);

             } catch (NoSuchMethodException | SecurityException e) {

                 throw new RuntimeException(

                         "exception on getting method Helper." + name, e);

             }

         }

         private static int staticMethod() {

             return 1138;

         }

         private int method() {

             return 42;

         }

         /**

          * Deoptimizes all non-osr versions of the given executable after

          * compilation finished.

          *

          * @param e Executable

          * @throws Exception

          */

         private static void waitAndDeoptimize(Executable e) {

             CompilerWhiteBoxTest.waitBackgroundCompilation(e);

             if (WhiteBox.getWhiteBox().isMethodQueuedForCompilation(e)) {

                 throw new RuntimeException(e + " must not be in queue");

             }

             // Deoptimize non-osr versions of executable

             WhiteBox.getWhiteBox().deoptimizeMethod(e, false);

         }

         /**

          * Executes the method multiple times to make sure we have

          * enough profiling information before triggering an OSR

          * compilation. Otherwise the C2 compiler may add uncommon traps.

          *

          * @param m Method to be executed

          * @return Number of times the method was executed

          * @throws Exception

          */

         private static int warmup(Method m) throws Exception {

             waitAndDeoptimize(m);

             Helper helper = new Helper();

             int result = 0;

             for (long i = 0; i < CompilerWhiteBoxTest.THRESHOLD; ++i) {

                 result += (int)m.invoke(helper, 1);

             }

             // Wait to make sure OSR compilation is not blocked by

             // non-OSR compilation in the compile queue

             CompilerWhiteBoxTest.waitBackgroundCompilation(m);

             return result;

         }

         /**

          * Executes the constructor multiple times to make sure we

          * have enough profiling information before triggering an OSR

          * compilation. Otherwise the C2 compiler may add uncommon traps.

          *

          * @param c Constructor to be executed

          * @return Number of times the constructor was executed

          * @throws Exception

          */

         private static int warmup(Constructor c) throws Exception {

             waitAndDeoptimize(c);

             int result = 0;

             for (long i = 0; i < CompilerWhiteBoxTest.THRESHOLD; ++i) {

                 result += c.newInstance(null, 1).hashCode();

             }

             // Wait to make sure OSR compilation is not blocked by

             // non-OSR compilation in the compile queue

             CompilerWhiteBoxTest.waitBackgroundCompilation(c);

             return result;

         }

         private static int osrStaticMethod(long limit) throws Exception {

             int result = 0;

             if (limit != 1) {

                 result = warmup(OSR_STATIC);

             }

             // Trigger osr compilation

             for (long i = 0; i < limit; ++i) {

                 result += staticMethod();

             }

             return result;

         }

         private int osrMethod(long limit) throws Exception {

             int result = 0;

             if (limit != 1) {

                 result = warmup(OSR_METHOD);

             }

             // Trigger osr compilation

             for (long i = 0; i < limit; ++i) {

                 result += method();

             }

             return result;

         }

         private final int x;

         // for method and OSR method test case

         public Helper() {

             x = 0;

         }

         // for OSR constructor test case

         private Helper(Object o, long limit) throws Exception {

             int result = 0;

             if (limit != 1) {

                 result = warmup(OSR_CONSTRUCTOR);

             }

             // Trigger osr compilation

             for (long i = 0; i < limit; ++i) {

                 result += method();

             }

             x = result;

         }

         // for constructor test case

         private Helper(int x) {

             this.x = x;

         }

         @Override

         public int hashCode() {

             return x;

         }

     }

 }