| /* |
| * Copyright (c) 2015, 2015, 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. |
| */ |
| package org.graalvm.compiler.core.test.tutorial; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| import org.graalvm.compiler.bytecode.Bytecode; |
| import org.graalvm.compiler.bytecode.BytecodeDisassembler; |
| import org.graalvm.compiler.bytecode.ResolvedJavaMethodBytecode; |
| |
| import jdk.vm.ci.code.InstalledCode; |
| import jdk.vm.ci.code.InvalidInstalledCodeException; |
| import jdk.vm.ci.meta.ResolvedJavaMethod; |
| |
| /** |
| * Examples for the Graal tutorial. Run them using the unittest harness of the mx script. To look at |
| * the examples in IGV (the graph visualization tool), use the {@code -Dgraal.Dump} and |
| * {@code -Dgraal.MethodFilter} options. For example, run the first test case using |
| * |
| * <pre> |
| * mx unittest -Dgraal.Dump= -Dgraal.MethodFilter=String.hashCode GraalTutorial#testStringHashCode |
| * </pre> |
| */ |
| public class GraalTutorial extends InvokeGraal { |
| |
| /* |
| * Example for the Graal API: access the Graal API metadata object for a method. |
| */ |
| |
| @Test |
| public void testPrintBytecodes() { |
| ResolvedJavaMethod method = findMethod(String.class, "hashCode"); |
| Bytecode bytecode = new ResolvedJavaMethodBytecode(method); |
| |
| byte[] bytecodes = bytecode.getCode(); |
| Assert.assertNotNull(bytecodes); |
| |
| System.out.println(new BytecodeDisassembler().disassemble(bytecode)); |
| } |
| |
| /* |
| * A simple Graal compilation example: Compile the method String.hashCode() |
| */ |
| |
| @Test |
| public void testStringHashCode() throws InvalidInstalledCodeException { |
| int expectedResult = "Hello World".hashCode(); |
| |
| InstalledCode installedCode = compileAndInstallMethod(findMethod(String.class, "hashCode")); |
| |
| int result = (int) installedCode.executeVarargs("Hello World"); |
| Assert.assertEquals(expectedResult, result); |
| } |
| |
| /* |
| * Tutorial example for speculative optimizations. |
| */ |
| |
| int f1; |
| int f2; |
| |
| public void speculativeOptimization(boolean flag) { |
| f1 = 41; |
| if (flag) { |
| f2 = 42; |
| return; |
| } |
| f2 = 43; |
| } |
| |
| @Test |
| public void testSpeculativeOptimization() throws InvalidInstalledCodeException { |
| /* |
| * Collect profiling information by running the method in the interpreter. |
| */ |
| |
| for (int i = 0; i < 10000; i++) { |
| /* Execute several times so that enough profiling information gets collected. */ |
| speculativeOptimization(false); |
| } |
| |
| /* |
| * Warmup to collect profiling information is done, now we compile the method. Since the |
| * value of "flag" was always false during the warmup, the compiled code speculates that the |
| * value remains false. |
| */ |
| |
| InstalledCode compiledMethod = compileAndInstallMethod(findMethod(GraalTutorial.class, "speculativeOptimization")); |
| f1 = 0; |
| f2 = 0; |
| compiledMethod.executeVarargs(this, true); |
| Assert.assertEquals(41, f1); |
| Assert.assertEquals(42, f2); |
| |
| /* |
| * We executed the compiled method with a "flag" value that triggered deoptimization (since |
| * the warmup always used the different "flag" value). The interpreter updated the profiling |
| * information, so the second compilation does not perform the speculative optimization. |
| */ |
| |
| compiledMethod = compileAndInstallMethod(findMethod(GraalTutorial.class, "speculativeOptimization")); |
| f1 = 0; |
| f2 = 0; |
| compiledMethod.executeVarargs(this, false); |
| Assert.assertEquals(41, f1); |
| Assert.assertEquals(43, f2); |
| } |
| |
| /* |
| * Tutorial example for snippets and lowering. |
| */ |
| |
| static class A { |
| } |
| |
| static class B extends A { |
| } |
| |
| public static int instanceOfUsage(Object obj) { |
| if (obj instanceof A) { |
| return 42; |
| } else { |
| return 0; |
| } |
| } |
| |
| @Test |
| public void testInstanceOfUsage() throws InvalidInstalledCodeException { |
| /* |
| * Collect profiling information by running the method in the interpreter. |
| */ |
| |
| A a = new A(); |
| /* Allocate an (unused) instance of B so that the class B gets loaded. */ |
| @SuppressWarnings("unused") |
| B b = new B(); |
| int expectedResult = instanceOfUsage(a); |
| for (int i = 0; i < 10000; i++) { |
| /* Execute several times so that enough profiling information gets collected. */ |
| instanceOfUsage(a); |
| } |
| |
| /* Warmup to collect profiling information is done, now compile the method. */ |
| |
| InstalledCode compiledMethod = compileAndInstallMethod(findMethod(GraalTutorial.class, "instanceOfUsage")); |
| |
| int result = (int) compiledMethod.executeVarargs(a); |
| Assert.assertEquals(expectedResult, result); |
| } |
| |
| /* |
| * Tutorial example for intrinsic methods. |
| */ |
| |
| public static double intrinsicUsage(double val) { |
| return Math.sin(val); |
| } |
| |
| @Test |
| public void testIntrinsicUsage() throws InvalidInstalledCodeException { |
| double expectedResult = intrinsicUsage(42d); |
| |
| InstalledCode compiledMethod = compileAndInstallMethod(findMethod(GraalTutorial.class, "intrinsicUsage")); |
| |
| double result = (double) compiledMethod.executeVarargs(42d); |
| Assert.assertEquals(expectedResult, result, 0); |
| } |
| } |