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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
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package org.graalvm.compiler.replacements.test.classfile;

import static org.graalvm.compiler.test.SubprocessUtil.getVMCommandLine;
import static org.graalvm.compiler.test.SubprocessUtil.java;
import static org.graalvm.compiler.test.SubprocessUtil.withoutDebuggerArguments;
import static org.junit.Assume.assumeTrue;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.lang.instrument.Instrumentation;
import java.lang.management.ManagementFactory;
import java.lang.reflect.Method;
import java.nio.file.Files;
import java.nio.file.Path;
import java.security.ProtectionDomain;
import java.util.List;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;

import javax.tools.ToolProvider;

import org.graalvm.compiler.api.replacements.ClassSubstitution;
import org.graalvm.compiler.api.replacements.MethodSubstitution;
import org.graalvm.compiler.bytecode.BytecodeProvider;
import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugins;
import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugins.Registration;
import org.graalvm.compiler.replacements.test.ReplacementsTest;
import org.graalvm.compiler.test.SubprocessUtil.Subprocess;
import org.junit.Assert;
import org.junit.Test;

import jdk.vm.ci.meta.ResolvedJavaMethod;

Tests that intrinsics (and snippets) are isolated from bytecode instrumentation.
/** * Tests that intrinsics (and snippets) are isolated from bytecode instrumentation. */
public class RedefineIntrinsicTest extends ReplacementsTest { public static class Original { // Intrinsified by Intrinsic.getValue public static String getValue() { return "original"; } } @ClassSubstitution(Original.class) private static class Intrinsic { @MethodSubstitution public static String getValue() { return "intrinsic"; } } @Override protected void registerInvocationPlugins(InvocationPlugins invocationPlugins) { BytecodeProvider replacementBytecodeProvider = getSystemClassLoaderBytecodeProvider(); Registration r = new Registration(invocationPlugins, Original.class, replacementBytecodeProvider); r.registerMethodSubstitution(Intrinsic.class, "getValue"); super.registerInvocationPlugins(invocationPlugins); } public static String callOriginalGetValue() { // This call will be intrinsified when compiled by Graal return Original.getValue(); } public static String callIntrinsicGetValue() { // This call will *not* be intrinsified when compiled by Graal return Intrinsic.getValue(); } @Test public void test() throws Throwable { try { Class.forName("java.lang.instrument.Instrumentation"); } catch (ClassNotFoundException ex) { // skip this test if java.instrument JDK9 module is missing return; } String recursionPropName = getClass().getName() + ".recursion"; if (Java8OrEarlier || Boolean.getBoolean(recursionPropName)) { testHelper(); } else { List<String> vmArgs = withoutDebuggerArguments(getVMCommandLine()); vmArgs.add("-D" + recursionPropName + "=true"); vmArgs.add("-Djdk.attach.allowAttachSelf=true"); Subprocess proc = java(vmArgs, "com.oracle.mxtool.junit.MxJUnitWrapper", getClass().getName()); if (proc.exitCode != 0) { Assert.fail(String.format("non-zero exit code %d for command:%n%s", proc.exitCode, proc)); } } } public void testHelper() throws Throwable { Object receiver = null; Object[] args = {}; // Prior to redefinition, both Original and Intrinsic // should behave as per their Java source code Assert.assertEquals("original", Original.getValue()); Assert.assertEquals("intrinsic", Intrinsic.getValue()); ResolvedJavaMethod callOriginalGetValue = getResolvedJavaMethod("callOriginalGetValue"); ResolvedJavaMethod callIntrinsicGetValue = getResolvedJavaMethod("callIntrinsicGetValue"); // Expect intrinsification to change "original" to "intrinsic" testAgainstExpected(callOriginalGetValue, new Result("intrinsic", null), receiver, args); // Expect no intrinsification testAgainstExpected(callIntrinsicGetValue, new Result("intrinsic", null), receiver, args); // Apply redefinition of intrinsic bytecode if (!redefineIntrinsic()) { // running on JDK9 without agent return; } // Expect redefinition to have no effect Assert.assertEquals("original", Original.getValue()); // Expect redefinition to change "intrinsic" to "redefined" Assert.assertEquals("redefined", Intrinsic.getValue()); // Expect redefinition to have no effect on intrinsification (i.e., // "original" is still changed to "intrinsic", not "redefined" testAgainstExpected(callOriginalGetValue, new Result("intrinsic", null), receiver, args); }
Adds the class file bytes for a given class to a JAR stream.
/** * Adds the class file bytes for a given class to a JAR stream. */
static void add(JarOutputStream jar, Class<?> c) throws IOException { String name = c.getName(); String classAsPath = name.replace('.', '/') + ".class"; jar.putNextEntry(new JarEntry(classAsPath)); InputStream stream = c.getClassLoader().getResourceAsStream(classAsPath); int nRead; byte[] buf = new byte[1024]; while ((nRead = stream.read(buf, 0, buf.length)) != -1) { jar.write(buf, 0, nRead); } jar.closeEntry(); } static boolean redefineIntrinsic() throws Exception { Manifest manifest = new Manifest(); manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0"); Attributes mainAttrs = manifest.getMainAttributes(); mainAttrs.putValue("Agent-Class", RedefinerAgent.class.getName()); mainAttrs.putValue("Can-Redefine-Classes", "true"); mainAttrs.putValue("Can-Retransform-Classes", "true"); Path jar = Files.createTempFile("myagent", ".jar"); try { JarOutputStream jarStream = new JarOutputStream(new FileOutputStream(jar.toFile()), manifest); add(jarStream, RedefinerAgent.class); add(jarStream, Redefiner.class); jarStream.close(); return loadAgent(jar); } finally { Files.deleteIfExists(jar); } } public static boolean loadAgent(Path agent) throws Exception { String vmName = ManagementFactory.getRuntimeMXBean().getName(); int p = vmName.indexOf('@'); assumeTrue("VM name not in <pid>@<host> format: " + vmName, p != -1); String pid = vmName.substring(0, p); Class<?> c; if (Java8OrEarlier) { ClassLoader cl = ToolProvider.getSystemToolClassLoader(); c = Class.forName("com.sun.tools.attach.VirtualMachine", true, cl); } else { try { // I don't know what changed to make this necessary... c = Class.forName("com.sun.tools.attach.VirtualMachine", true, RedefineIntrinsicTest.class.getClassLoader()); } catch (ClassNotFoundException ex) { try { Class.forName("javax.naming.Reference"); } catch (ClassNotFoundException coreNamingMissing) { // if core JDK classes aren't found, we are probably running in a // JDK9 java.base environment and then missing class is OK return false; } throw ex; } } Method attach = c.getDeclaredMethod("attach", String.class); Method loadAgent = c.getDeclaredMethod("loadAgent", String.class, String.class); Method detach = c.getDeclaredMethod("detach"); Object vm = attach.invoke(null, pid); loadAgent.invoke(vm, agent.toString(), ""); detach.invoke(vm); return true; } public static class RedefinerAgent { public static void agentmain(@SuppressWarnings("unused") String args, Instrumentation inst) throws Exception { if (inst.isRedefineClassesSupported() && inst.isRetransformClassesSupported()) { inst.addTransformer(new Redefiner(), true); Class<?>[] allClasses = inst.getAllLoadedClasses(); for (int i = 0; i < allClasses.length; i++) { Class<?> c = allClasses[i]; if (c == Intrinsic.class) { inst.retransformClasses(new Class<?>[]{c}); } } } } }
This transformer replaces the first instance of the constant "intrinsic" in the class file for Intrinsic with "redefined".
/** * This transformer replaces the first instance of the constant "intrinsic" in the class file * for {@link Intrinsic} with "redefined". */
static class Redefiner implements ClassFileTransformer { @Override public byte[] transform(ClassLoader cl, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException { if (Intrinsic.class.equals(classBeingRedefined)) { String cf = new String(classfileBuffer); int i = cf.indexOf("intrinsic"); Assert.assertTrue("cannot find \"intrinsic\" constant in " + Intrinsic.class.getSimpleName() + "'s class file", i > 0); System.arraycopy("redefined".getBytes(), 0, classfileBuffer, i, "redefined".length()); } return classfileBuffer; } } }