--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/compiler/tiered/LevelTransitionTest.java Sat Dec 13 01:24:07 2014 +0300
@@ -0,0 +1,247 @@
+/*
+ * 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 /../../test/lib /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;
+ }
+ }
+}