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* 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
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*/
/**
* @test LevelTransitionTest
* @summary Test the correctness of compilation level transitions for different methods
* @library /test/lib /
* @modules java.base/jdk.internal.misc
* java.management
*
* @build sun.hotspot.WhiteBox
* compiler.tiered.LevelTransitionTest
* @run driver ClassFileInstaller sun.hotspot.WhiteBox
* sun.hotspot.WhiteBox$WhiteBoxPermission
* @run main/othervm/timeout=240 -Xmixed -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
* -XX:+WhiteBoxAPI -XX:+TieredCompilation -XX:-UseCounterDecay
* -XX:CompileCommand=compileonly,compiler.whitebox.SimpleTestCaseHelper::*
* -XX:CompileCommand=compileonly,compiler.tiered.LevelTransitionTest$ExtendedTestCase$CompileMethodHolder::*
* compiler.tiered.LevelTransitionTest
*/
package compiler.tiered;
import compiler.whitebox.CompilerWhiteBoxTest;
import compiler.whitebox.SimpleTestCase;
import java.lang.reflect.Executable;
import java.lang.reflect.Method;
import java.util.Objects;
import java.util.concurrent.Callable;
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() throws Exception {
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);
}
};
}
}
private static 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;
}
}
}
}