1882 lines
75 KiB
Java
1882 lines
75 KiB
Java
/*
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* Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang.invoke;
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import jdk.internal.org.objectweb.asm.ClassWriter;
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import jdk.internal.org.objectweb.asm.Label;
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import jdk.internal.org.objectweb.asm.MethodVisitor;
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import jdk.internal.org.objectweb.asm.Opcodes;
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import jdk.internal.org.objectweb.asm.Type;
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import sun.invoke.util.VerifyAccess;
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import sun.invoke.util.VerifyType;
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import sun.invoke.util.Wrapper;
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import sun.reflect.misc.ReflectUtil;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.lang.reflect.Modifier;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.stream.Stream;
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import static java.lang.invoke.LambdaForm.BasicType;
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import static java.lang.invoke.LambdaForm.BasicType.*;
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import static java.lang.invoke.LambdaForm.*;
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import static java.lang.invoke.MethodHandleNatives.Constants.*;
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import static java.lang.invoke.MethodHandleStatics.*;
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/**
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* Code generation backend for LambdaForm.
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* <p>
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* @author John Rose, JSR 292 EG
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*/
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class InvokerBytecodeGenerator {
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/** Define class names for convenience. */
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private static final String MH = "java/lang/invoke/MethodHandle";
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private static final String MHI = "java/lang/invoke/MethodHandleImpl";
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private static final String LF = "java/lang/invoke/LambdaForm";
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private static final String LFN = "java/lang/invoke/LambdaForm$Name";
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private static final String CLS = "java/lang/Class";
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private static final String OBJ = "java/lang/Object";
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private static final String OBJARY = "[Ljava/lang/Object;";
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private static final String LOOP_CLAUSES = MHI + "$LoopClauses";
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private static final String MHARY2 = "[[L" + MH + ";";
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private static final String LF_SIG = "L" + LF + ";";
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private static final String LFN_SIG = "L" + LFN + ";";
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private static final String LL_SIG = "(L" + OBJ + ";)L" + OBJ + ";";
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private static final String LLV_SIG = "(L" + OBJ + ";L" + OBJ + ";)V";
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private static final String CLASS_PREFIX = LF + "$";
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private static final String SOURCE_PREFIX = "LambdaForm$";
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/** Name of its super class*/
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static final String INVOKER_SUPER_NAME = OBJ;
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/** Name of new class */
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private final String className;
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private final LambdaForm lambdaForm;
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private final String invokerName;
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private final MethodType invokerType;
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/** Info about local variables in compiled lambda form */
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private int[] localsMap; // index
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private Class<?>[] localClasses; // type
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/** ASM bytecode generation. */
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private ClassWriter cw;
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private MethodVisitor mv;
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/** Single element internal class name lookup cache. */
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private Class<?> lastClass;
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private String lastInternalName;
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private static final MemberName.Factory MEMBERNAME_FACTORY = MemberName.getFactory();
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private static final Class<?> HOST_CLASS = LambdaForm.class;
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/** Main constructor; other constructors delegate to this one. */
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private InvokerBytecodeGenerator(LambdaForm lambdaForm, int localsMapSize,
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String className, String invokerName, MethodType invokerType) {
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int p = invokerName.indexOf('.');
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if (p > -1) {
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className = invokerName.substring(0, p);
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invokerName = invokerName.substring(p + 1);
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}
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if (DUMP_CLASS_FILES) {
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className = makeDumpableClassName(className);
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}
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this.className = className;
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this.lambdaForm = lambdaForm;
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this.invokerName = invokerName;
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this.invokerType = invokerType;
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this.localsMap = new int[localsMapSize+1]; // last entry of localsMap is count of allocated local slots
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this.localClasses = new Class<?>[localsMapSize+1];
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}
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/** For generating LambdaForm interpreter entry points. */
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private InvokerBytecodeGenerator(String className, String invokerName, MethodType invokerType) {
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this(null, invokerType.parameterCount(),
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className, invokerName, invokerType);
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// Create an array to map name indexes to locals indexes.
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for (int i = 0; i < localsMap.length; i++) {
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localsMap[i] = invokerType.parameterSlotCount() - invokerType.parameterSlotDepth(i);
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}
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}
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/** For generating customized code for a single LambdaForm. */
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private InvokerBytecodeGenerator(String className, LambdaForm form, MethodType invokerType) {
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this(className, form.lambdaName(), form, invokerType);
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}
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/** For generating customized code for a single LambdaForm. */
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InvokerBytecodeGenerator(String className, String invokerName,
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LambdaForm form, MethodType invokerType) {
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this(form, form.names.length,
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className, invokerName, invokerType);
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// Create an array to map name indexes to locals indexes.
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Name[] names = form.names;
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for (int i = 0, index = 0; i < localsMap.length; i++) {
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localsMap[i] = index;
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if (i < names.length) {
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BasicType type = names[i].type();
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index += type.basicTypeSlots();
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}
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}
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}
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/** instance counters for dumped classes */
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private static final HashMap<String,Integer> DUMP_CLASS_FILES_COUNTERS;
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/** debugging flag for saving generated class files */
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private static final File DUMP_CLASS_FILES_DIR;
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static {
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if (DUMP_CLASS_FILES) {
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DUMP_CLASS_FILES_COUNTERS = new HashMap<>();
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try {
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File dumpDir = new File("DUMP_CLASS_FILES");
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if (!dumpDir.exists()) {
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dumpDir.mkdirs();
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}
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DUMP_CLASS_FILES_DIR = dumpDir;
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System.out.println("Dumping class files to "+DUMP_CLASS_FILES_DIR+"/...");
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} catch (Exception e) {
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throw newInternalError(e);
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}
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} else {
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DUMP_CLASS_FILES_COUNTERS = null;
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DUMP_CLASS_FILES_DIR = null;
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}
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}
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private void maybeDump(final byte[] classFile) {
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if (DUMP_CLASS_FILES) {
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maybeDump(CLASS_PREFIX + className, classFile);
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}
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}
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// Also used from BoundMethodHandle
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static void maybeDump(final String className, final byte[] classFile) {
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if (DUMP_CLASS_FILES) {
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java.security.AccessController.doPrivileged(
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new java.security.PrivilegedAction<>() {
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public Void run() {
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try {
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String dumpName = className.replace('.','/');
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File dumpFile = new File(DUMP_CLASS_FILES_DIR, dumpName+".class");
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System.out.println("dump: " + dumpFile);
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dumpFile.getParentFile().mkdirs();
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FileOutputStream file = new FileOutputStream(dumpFile);
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file.write(classFile);
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file.close();
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return null;
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} catch (IOException ex) {
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throw newInternalError(ex);
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}
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}
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});
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}
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}
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private static String makeDumpableClassName(String className) {
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Integer ctr;
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synchronized (DUMP_CLASS_FILES_COUNTERS) {
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ctr = DUMP_CLASS_FILES_COUNTERS.get(className);
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if (ctr == null) ctr = 0;
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DUMP_CLASS_FILES_COUNTERS.put(className, ctr+1);
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}
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String sfx = ctr.toString();
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while (sfx.length() < 3)
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sfx = "0"+sfx;
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className += sfx;
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return className;
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}
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class CpPatch {
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final int index;
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final Object value;
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CpPatch(int index, Object value) {
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this.index = index;
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this.value = value;
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}
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public String toString() {
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return "CpPatch/index="+index+",value="+value;
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}
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}
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private final ArrayList<CpPatch> cpPatches = new ArrayList<>();
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private int cph = 0; // for counting constant placeholders
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String constantPlaceholder(Object arg) {
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String cpPlaceholder = "CONSTANT_PLACEHOLDER_" + cph++;
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if (DUMP_CLASS_FILES) cpPlaceholder += " <<" + debugString(arg) + ">>";
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// TODO check if arg is already in the constant pool
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// insert placeholder in CP and remember the patch
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int index = cw.newConst((Object) cpPlaceholder);
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cpPatches.add(new CpPatch(index, arg));
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return cpPlaceholder;
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}
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Object[] cpPatches(byte[] classFile) {
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int size = getConstantPoolSize(classFile);
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Object[] res = new Object[size];
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for (CpPatch p : cpPatches) {
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if (p.index >= size)
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throw new InternalError("in cpool["+size+"]: "+p+"\n"+Arrays.toString(Arrays.copyOf(classFile, 20)));
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res[p.index] = p.value;
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}
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return res;
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}
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private static String debugString(Object arg) {
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if (arg instanceof MethodHandle) {
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MethodHandle mh = (MethodHandle) arg;
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MemberName member = mh.internalMemberName();
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if (member != null)
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return member.toString();
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return mh.debugString();
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}
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return arg.toString();
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}
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/**
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* Extract the number of constant pool entries from a given class file.
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*
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* @param classFile the bytes of the class file in question.
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* @return the number of entries in the constant pool.
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*/
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private static int getConstantPoolSize(byte[] classFile) {
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// The first few bytes:
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// u4 magic;
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// u2 minor_version;
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// u2 major_version;
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// u2 constant_pool_count;
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return ((classFile[8] & 0xFF) << 8) | (classFile[9] & 0xFF);
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}
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/**
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* Extract the MemberName of a newly-defined method.
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*/
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private MemberName loadMethod(byte[] classFile) {
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Class<?> invokerClass = loadAndInitializeInvokerClass(classFile, cpPatches(classFile));
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return resolveInvokerMember(invokerClass, invokerName, invokerType);
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}
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/**
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* Define a given class as anonymous class in the runtime system.
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*/
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private static Class<?> loadAndInitializeInvokerClass(byte[] classBytes, Object[] patches) {
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Class<?> invokerClass = UNSAFE.defineAnonymousClass(HOST_CLASS, classBytes, patches);
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UNSAFE.ensureClassInitialized(invokerClass); // Make sure the class is initialized; VM might complain.
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return invokerClass;
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}
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private static MemberName resolveInvokerMember(Class<?> invokerClass, String name, MethodType type) {
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MemberName member = new MemberName(invokerClass, name, type, REF_invokeStatic);
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try {
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member = MEMBERNAME_FACTORY.resolveOrFail(REF_invokeStatic, member, HOST_CLASS, ReflectiveOperationException.class);
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} catch (ReflectiveOperationException e) {
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throw newInternalError(e);
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}
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return member;
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}
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/**
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* Set up class file generation.
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*/
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private ClassWriter classFilePrologue() {
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final int NOT_ACC_PUBLIC = 0; // not ACC_PUBLIC
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cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
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cw.visit(Opcodes.V1_8, NOT_ACC_PUBLIC + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER,
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CLASS_PREFIX + className, null, INVOKER_SUPER_NAME, null);
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cw.visitSource(SOURCE_PREFIX + className, null);
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return cw;
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}
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private void methodPrologue() {
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String invokerDesc = invokerType.toMethodDescriptorString();
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mv = cw.visitMethod(Opcodes.ACC_STATIC, invokerName, invokerDesc, null, null);
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}
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/**
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* Tear down class file generation.
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*/
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private void methodEpilogue() {
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mv.visitMaxs(0, 0);
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mv.visitEnd();
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}
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/*
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* Low-level emit helpers.
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*/
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private void emitConst(Object con) {
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if (con == null) {
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mv.visitInsn(Opcodes.ACONST_NULL);
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return;
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}
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if (con instanceof Integer) {
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emitIconstInsn((int) con);
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return;
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}
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if (con instanceof Byte) {
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emitIconstInsn((byte)con);
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return;
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}
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if (con instanceof Short) {
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emitIconstInsn((short)con);
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return;
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}
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if (con instanceof Character) {
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emitIconstInsn((char)con);
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return;
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}
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if (con instanceof Long) {
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long x = (long) con;
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short sx = (short)x;
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if (x == sx) {
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if (sx >= 0 && sx <= 1) {
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mv.visitInsn(Opcodes.LCONST_0 + (int) sx);
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} else {
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emitIconstInsn((int) x);
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mv.visitInsn(Opcodes.I2L);
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}
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return;
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}
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}
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if (con instanceof Float) {
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float x = (float) con;
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short sx = (short)x;
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if (x == sx) {
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if (sx >= 0 && sx <= 2) {
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mv.visitInsn(Opcodes.FCONST_0 + (int) sx);
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} else {
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emitIconstInsn((int) x);
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mv.visitInsn(Opcodes.I2F);
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}
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return;
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}
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}
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if (con instanceof Double) {
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double x = (double) con;
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short sx = (short)x;
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if (x == sx) {
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if (sx >= 0 && sx <= 1) {
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mv.visitInsn(Opcodes.DCONST_0 + (int) sx);
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} else {
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emitIconstInsn((int) x);
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mv.visitInsn(Opcodes.I2D);
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}
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return;
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}
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}
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if (con instanceof Boolean) {
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emitIconstInsn((boolean) con ? 1 : 0);
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return;
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}
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// fall through:
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mv.visitLdcInsn(con);
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}
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private void emitIconstInsn(final int cst) {
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if (cst >= -1 && cst <= 5) {
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mv.visitInsn(Opcodes.ICONST_0 + cst);
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} else if (cst >= Byte.MIN_VALUE && cst <= Byte.MAX_VALUE) {
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mv.visitIntInsn(Opcodes.BIPUSH, cst);
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} else if (cst >= Short.MIN_VALUE && cst <= Short.MAX_VALUE) {
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mv.visitIntInsn(Opcodes.SIPUSH, cst);
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} else {
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mv.visitLdcInsn(cst);
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}
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}
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/*
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* NOTE: These load/store methods use the localsMap to find the correct index!
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*/
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private void emitLoadInsn(BasicType type, int index) {
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int opcode = loadInsnOpcode(type);
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mv.visitVarInsn(opcode, localsMap[index]);
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}
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private int loadInsnOpcode(BasicType type) throws InternalError {
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switch (type) {
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case I_TYPE: return Opcodes.ILOAD;
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case J_TYPE: return Opcodes.LLOAD;
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case F_TYPE: return Opcodes.FLOAD;
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case D_TYPE: return Opcodes.DLOAD;
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case L_TYPE: return Opcodes.ALOAD;
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default:
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throw new InternalError("unknown type: " + type);
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}
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}
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private void emitAloadInsn(int index) {
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emitLoadInsn(L_TYPE, index);
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}
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private void emitStoreInsn(BasicType type, int index) {
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int opcode = storeInsnOpcode(type);
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mv.visitVarInsn(opcode, localsMap[index]);
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}
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private int storeInsnOpcode(BasicType type) throws InternalError {
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switch (type) {
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case I_TYPE: return Opcodes.ISTORE;
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case J_TYPE: return Opcodes.LSTORE;
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case F_TYPE: return Opcodes.FSTORE;
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case D_TYPE: return Opcodes.DSTORE;
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case L_TYPE: return Opcodes.ASTORE;
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default:
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throw new InternalError("unknown type: " + type);
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}
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}
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private void emitAstoreInsn(int index) {
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emitStoreInsn(L_TYPE, index);
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}
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private byte arrayTypeCode(Wrapper elementType) {
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switch (elementType) {
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case BOOLEAN: return Opcodes.T_BOOLEAN;
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case BYTE: return Opcodes.T_BYTE;
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case CHAR: return Opcodes.T_CHAR;
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case SHORT: return Opcodes.T_SHORT;
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case INT: return Opcodes.T_INT;
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case LONG: return Opcodes.T_LONG;
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case FLOAT: return Opcodes.T_FLOAT;
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case DOUBLE: return Opcodes.T_DOUBLE;
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case OBJECT: return 0; // in place of Opcodes.T_OBJECT
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default: throw new InternalError();
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}
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}
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private int arrayInsnOpcode(byte tcode, int aaop) throws InternalError {
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assert(aaop == Opcodes.AASTORE || aaop == Opcodes.AALOAD);
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|
int xas;
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switch (tcode) {
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case Opcodes.T_BOOLEAN: xas = Opcodes.BASTORE; break;
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case Opcodes.T_BYTE: xas = Opcodes.BASTORE; break;
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case Opcodes.T_CHAR: xas = Opcodes.CASTORE; break;
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case Opcodes.T_SHORT: xas = Opcodes.SASTORE; break;
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case Opcodes.T_INT: xas = Opcodes.IASTORE; break;
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case Opcodes.T_LONG: xas = Opcodes.LASTORE; break;
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case Opcodes.T_FLOAT: xas = Opcodes.FASTORE; break;
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case Opcodes.T_DOUBLE: xas = Opcodes.DASTORE; break;
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case 0: xas = Opcodes.AASTORE; break;
|
|
default: throw new InternalError();
|
|
}
|
|
return xas - Opcodes.AASTORE + aaop;
|
|
}
|
|
|
|
/**
|
|
* Emit a boxing call.
|
|
*
|
|
* @param wrapper primitive type class to box.
|
|
*/
|
|
private void emitBoxing(Wrapper wrapper) {
|
|
String owner = "java/lang/" + wrapper.wrapperType().getSimpleName();
|
|
String name = "valueOf";
|
|
String desc = "(" + wrapper.basicTypeChar() + ")L" + owner + ";";
|
|
mv.visitMethodInsn(Opcodes.INVOKESTATIC, owner, name, desc, false);
|
|
}
|
|
|
|
/**
|
|
* Emit an unboxing call (plus preceding checkcast).
|
|
*
|
|
* @param wrapper wrapper type class to unbox.
|
|
*/
|
|
private void emitUnboxing(Wrapper wrapper) {
|
|
String owner = "java/lang/" + wrapper.wrapperType().getSimpleName();
|
|
String name = wrapper.primitiveSimpleName() + "Value";
|
|
String desc = "()" + wrapper.basicTypeChar();
|
|
emitReferenceCast(wrapper.wrapperType(), null);
|
|
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, owner, name, desc, false);
|
|
}
|
|
|
|
/**
|
|
* Emit an implicit conversion for an argument which must be of the given pclass.
|
|
* This is usually a no-op, except when pclass is a subword type or a reference other than Object or an interface.
|
|
*
|
|
* @param ptype type of value present on stack
|
|
* @param pclass type of value required on stack
|
|
* @param arg compile-time representation of value on stack (Node, constant) or null if none
|
|
*/
|
|
private void emitImplicitConversion(BasicType ptype, Class<?> pclass, Object arg) {
|
|
assert(basicType(pclass) == ptype); // boxing/unboxing handled by caller
|
|
if (pclass == ptype.basicTypeClass() && ptype != L_TYPE)
|
|
return; // nothing to do
|
|
switch (ptype) {
|
|
case L_TYPE:
|
|
if (VerifyType.isNullConversion(Object.class, pclass, false)) {
|
|
if (PROFILE_LEVEL > 0)
|
|
emitReferenceCast(Object.class, arg);
|
|
return;
|
|
}
|
|
emitReferenceCast(pclass, arg);
|
|
return;
|
|
case I_TYPE:
|
|
if (!VerifyType.isNullConversion(int.class, pclass, false))
|
|
emitPrimCast(ptype.basicTypeWrapper(), Wrapper.forPrimitiveType(pclass));
|
|
return;
|
|
}
|
|
throw newInternalError("bad implicit conversion: tc="+ptype+": "+pclass);
|
|
}
|
|
|
|
/** Update localClasses type map. Return true if the information is already present. */
|
|
private boolean assertStaticType(Class<?> cls, Name n) {
|
|
int local = n.index();
|
|
Class<?> aclass = localClasses[local];
|
|
if (aclass != null && (aclass == cls || cls.isAssignableFrom(aclass))) {
|
|
return true; // type info is already present
|
|
} else if (aclass == null || aclass.isAssignableFrom(cls)) {
|
|
localClasses[local] = cls; // type info can be improved
|
|
}
|
|
return false;
|
|
}
|
|
|
|
private void emitReferenceCast(Class<?> cls, Object arg) {
|
|
Name writeBack = null; // local to write back result
|
|
if (arg instanceof Name) {
|
|
Name n = (Name) arg;
|
|
if (lambdaForm.useCount(n) > 1) {
|
|
// This guy gets used more than once.
|
|
writeBack = n;
|
|
if (assertStaticType(cls, n)) {
|
|
return; // this cast was already performed
|
|
}
|
|
}
|
|
}
|
|
if (isStaticallyNameable(cls)) {
|
|
String sig = getInternalName(cls);
|
|
mv.visitTypeInsn(Opcodes.CHECKCAST, sig);
|
|
} else {
|
|
mv.visitLdcInsn(constantPlaceholder(cls));
|
|
mv.visitTypeInsn(Opcodes.CHECKCAST, CLS);
|
|
mv.visitInsn(Opcodes.SWAP);
|
|
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, CLS, "cast", LL_SIG, false);
|
|
if (Object[].class.isAssignableFrom(cls))
|
|
mv.visitTypeInsn(Opcodes.CHECKCAST, OBJARY);
|
|
else if (PROFILE_LEVEL > 0)
|
|
mv.visitTypeInsn(Opcodes.CHECKCAST, OBJ);
|
|
}
|
|
if (writeBack != null) {
|
|
mv.visitInsn(Opcodes.DUP);
|
|
emitAstoreInsn(writeBack.index());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Emits an actual return instruction conforming to the given return type.
|
|
*/
|
|
private void emitReturnInsn(BasicType type) {
|
|
int opcode;
|
|
switch (type) {
|
|
case I_TYPE: opcode = Opcodes.IRETURN; break;
|
|
case J_TYPE: opcode = Opcodes.LRETURN; break;
|
|
case F_TYPE: opcode = Opcodes.FRETURN; break;
|
|
case D_TYPE: opcode = Opcodes.DRETURN; break;
|
|
case L_TYPE: opcode = Opcodes.ARETURN; break;
|
|
case V_TYPE: opcode = Opcodes.RETURN; break;
|
|
default:
|
|
throw new InternalError("unknown return type: " + type);
|
|
}
|
|
mv.visitInsn(opcode);
|
|
}
|
|
|
|
private String getInternalName(Class<?> c) {
|
|
if (c == Object.class) return OBJ;
|
|
else if (c == Object[].class) return OBJARY;
|
|
else if (c == Class.class) return CLS;
|
|
else if (c == MethodHandle.class) return MH;
|
|
assert(VerifyAccess.isTypeVisible(c, Object.class)) : c.getName();
|
|
|
|
if (c == lastClass) {
|
|
return lastInternalName;
|
|
}
|
|
lastClass = c;
|
|
return lastInternalName = c.getName().replace('.', '/');
|
|
}
|
|
|
|
private static MemberName resolveFrom(String name, MethodType type, Class<?> holder) {
|
|
MemberName member = new MemberName(holder, name, type, REF_invokeStatic);
|
|
MemberName resolvedMember = MemberName.getFactory().resolveOrNull(REF_invokeStatic, member, holder);
|
|
if (TRACE_RESOLVE) {
|
|
System.out.println("[LF_RESOLVE] " + holder.getName() + " " + name + " " +
|
|
shortenSignature(basicTypeSignature(type)) + (resolvedMember != null ? " (success)" : " (fail)") );
|
|
}
|
|
return resolvedMember;
|
|
}
|
|
|
|
private static MemberName lookupPregenerated(LambdaForm form, MethodType invokerType) {
|
|
if (form.customized != null) {
|
|
// No pre-generated version for customized LF
|
|
return null;
|
|
}
|
|
String name = form.kind.methodName;
|
|
switch (form.kind) {
|
|
case BOUND_REINVOKER: {
|
|
name = name + "_" + BoundMethodHandle.speciesDataFor(form).key();
|
|
return resolveFrom(name, invokerType, DelegatingMethodHandle.Holder.class);
|
|
}
|
|
case DELEGATE: return resolveFrom(name, invokerType, DelegatingMethodHandle.Holder.class);
|
|
case ZERO: // fall-through
|
|
case IDENTITY: {
|
|
name = name + "_" + form.returnType().basicTypeChar();
|
|
return resolveFrom(name, invokerType, LambdaForm.Holder.class);
|
|
}
|
|
case EXACT_INVOKER: // fall-through
|
|
case EXACT_LINKER: // fall-through
|
|
case LINK_TO_CALL_SITE: // fall-through
|
|
case LINK_TO_TARGET_METHOD: // fall-through
|
|
case GENERIC_INVOKER: // fall-through
|
|
case GENERIC_LINKER: return resolveFrom(name, invokerType.basicType(), Invokers.Holder.class);
|
|
case GET_REFERENCE: // fall-through
|
|
case GET_BOOLEAN: // fall-through
|
|
case GET_BYTE: // fall-through
|
|
case GET_CHAR: // fall-through
|
|
case GET_SHORT: // fall-through
|
|
case GET_INT: // fall-through
|
|
case GET_LONG: // fall-through
|
|
case GET_FLOAT: // fall-through
|
|
case GET_DOUBLE: // fall-through
|
|
case PUT_REFERENCE: // fall-through
|
|
case PUT_BOOLEAN: // fall-through
|
|
case PUT_BYTE: // fall-through
|
|
case PUT_CHAR: // fall-through
|
|
case PUT_SHORT: // fall-through
|
|
case PUT_INT: // fall-through
|
|
case PUT_LONG: // fall-through
|
|
case PUT_FLOAT: // fall-through
|
|
case PUT_DOUBLE: // fall-through
|
|
case DIRECT_NEW_INVOKE_SPECIAL: // fall-through
|
|
case DIRECT_INVOKE_INTERFACE: // fall-through
|
|
case DIRECT_INVOKE_SPECIAL: // fall-through
|
|
case DIRECT_INVOKE_SPECIAL_IFC: // fall-through
|
|
case DIRECT_INVOKE_STATIC: // fall-through
|
|
case DIRECT_INVOKE_STATIC_INIT: // fall-through
|
|
case DIRECT_INVOKE_VIRTUAL: return resolveFrom(name, invokerType, DirectMethodHandle.Holder.class);
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Generate customized bytecode for a given LambdaForm.
|
|
*/
|
|
static MemberName generateCustomizedCode(LambdaForm form, MethodType invokerType) {
|
|
MemberName pregenerated = lookupPregenerated(form, invokerType);
|
|
if (pregenerated != null) return pregenerated; // pre-generated bytecode
|
|
|
|
InvokerBytecodeGenerator g = new InvokerBytecodeGenerator("MH", form, invokerType);
|
|
return g.loadMethod(g.generateCustomizedCodeBytes());
|
|
}
|
|
|
|
/** Generates code to check that actual receiver and LambdaForm matches */
|
|
private boolean checkActualReceiver() {
|
|
// Expects MethodHandle on the stack and actual receiver MethodHandle in slot #0
|
|
mv.visitInsn(Opcodes.DUP);
|
|
mv.visitVarInsn(Opcodes.ALOAD, localsMap[0]);
|
|
mv.visitMethodInsn(Opcodes.INVOKESTATIC, MHI, "assertSame", LLV_SIG, false);
|
|
return true;
|
|
}
|
|
|
|
static String className(String cn) {
|
|
assert checkClassName(cn): "Class not found: " + cn;
|
|
return cn;
|
|
}
|
|
|
|
static boolean checkClassName(String cn) {
|
|
Type tp = Type.getType(cn);
|
|
// additional sanity so only valid "L;" descriptors work
|
|
if (tp.getSort() != Type.OBJECT) {
|
|
return false;
|
|
}
|
|
try {
|
|
Class<?> c = Class.forName(tp.getClassName(), false, null);
|
|
return true;
|
|
} catch (ClassNotFoundException e) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static final String DONTINLINE_SIG = className("Ljdk/internal/vm/annotation/DontInline;");
|
|
static final String FORCEINLINE_SIG = className("Ljdk/internal/vm/annotation/ForceInline;");
|
|
static final String HIDDEN_SIG = className("Ljdk/internal/vm/annotation/Hidden;");
|
|
static final String INJECTEDPROFILE_SIG = className("Ljava/lang/invoke/InjectedProfile;");
|
|
static final String LF_COMPILED_SIG = className("Ljava/lang/invoke/LambdaForm$Compiled;");
|
|
|
|
/**
|
|
* Generate an invoker method for the passed {@link LambdaForm}.
|
|
*/
|
|
private byte[] generateCustomizedCodeBytes() {
|
|
classFilePrologue();
|
|
addMethod();
|
|
bogusMethod(lambdaForm);
|
|
|
|
final byte[] classFile = toByteArray();
|
|
maybeDump(classFile);
|
|
return classFile;
|
|
}
|
|
|
|
void setClassWriter(ClassWriter cw) {
|
|
this.cw = cw;
|
|
}
|
|
|
|
void addMethod() {
|
|
methodPrologue();
|
|
|
|
// Suppress this method in backtraces displayed to the user.
|
|
mv.visitAnnotation(HIDDEN_SIG, true);
|
|
|
|
// Mark this method as a compiled LambdaForm
|
|
mv.visitAnnotation(LF_COMPILED_SIG, true);
|
|
|
|
if (lambdaForm.forceInline) {
|
|
// Force inlining of this invoker method.
|
|
mv.visitAnnotation(FORCEINLINE_SIG, true);
|
|
} else {
|
|
mv.visitAnnotation(DONTINLINE_SIG, true);
|
|
}
|
|
|
|
constantPlaceholder(lambdaForm); // keep LambdaForm instance & its compiled form lifetime tightly coupled.
|
|
|
|
if (lambdaForm.customized != null) {
|
|
// Since LambdaForm is customized for a particular MethodHandle, it's safe to substitute
|
|
// receiver MethodHandle (at slot #0) with an embedded constant and use it instead.
|
|
// It enables more efficient code generation in some situations, since embedded constants
|
|
// are compile-time constants for JIT compiler.
|
|
mv.visitLdcInsn(constantPlaceholder(lambdaForm.customized));
|
|
mv.visitTypeInsn(Opcodes.CHECKCAST, MH);
|
|
assert(checkActualReceiver()); // expects MethodHandle on top of the stack
|
|
mv.visitVarInsn(Opcodes.ASTORE, localsMap[0]);
|
|
}
|
|
|
|
// iterate over the form's names, generating bytecode instructions for each
|
|
// start iterating at the first name following the arguments
|
|
Name onStack = null;
|
|
for (int i = lambdaForm.arity; i < lambdaForm.names.length; i++) {
|
|
Name name = lambdaForm.names[i];
|
|
|
|
emitStoreResult(onStack);
|
|
onStack = name; // unless otherwise modified below
|
|
MethodHandleImpl.Intrinsic intr = name.function.intrinsicName();
|
|
switch (intr) {
|
|
case SELECT_ALTERNATIVE:
|
|
assert lambdaForm.isSelectAlternative(i);
|
|
if (PROFILE_GWT) {
|
|
assert(name.arguments[0] instanceof Name &&
|
|
((Name)name.arguments[0]).refersTo(MethodHandleImpl.class, "profileBoolean"));
|
|
mv.visitAnnotation(INJECTEDPROFILE_SIG, true);
|
|
}
|
|
onStack = emitSelectAlternative(name, lambdaForm.names[i+1]);
|
|
i++; // skip MH.invokeBasic of the selectAlternative result
|
|
continue;
|
|
case GUARD_WITH_CATCH:
|
|
assert lambdaForm.isGuardWithCatch(i);
|
|
onStack = emitGuardWithCatch(i);
|
|
i += 2; // jump to the end of GWC idiom
|
|
continue;
|
|
case TRY_FINALLY:
|
|
assert lambdaForm.isTryFinally(i);
|
|
onStack = emitTryFinally(i);
|
|
i += 2; // jump to the end of the TF idiom
|
|
continue;
|
|
case LOOP:
|
|
assert lambdaForm.isLoop(i);
|
|
onStack = emitLoop(i);
|
|
i += 2; // jump to the end of the LOOP idiom
|
|
continue;
|
|
case NEW_ARRAY:
|
|
Class<?> rtype = name.function.methodType().returnType();
|
|
if (isStaticallyNameable(rtype)) {
|
|
emitNewArray(name);
|
|
continue;
|
|
}
|
|
break;
|
|
case ARRAY_LOAD:
|
|
emitArrayLoad(name);
|
|
continue;
|
|
case ARRAY_STORE:
|
|
emitArrayStore(name);
|
|
continue;
|
|
case ARRAY_LENGTH:
|
|
emitArrayLength(name);
|
|
continue;
|
|
case IDENTITY:
|
|
assert(name.arguments.length == 1);
|
|
emitPushArguments(name, 0);
|
|
continue;
|
|
case ZERO:
|
|
assert(name.arguments.length == 0);
|
|
emitConst(name.type.basicTypeWrapper().zero());
|
|
continue;
|
|
case NONE:
|
|
// no intrinsic associated
|
|
break;
|
|
default:
|
|
throw newInternalError("Unknown intrinsic: "+intr);
|
|
}
|
|
|
|
MemberName member = name.function.member();
|
|
if (isStaticallyInvocable(member)) {
|
|
emitStaticInvoke(member, name);
|
|
} else {
|
|
emitInvoke(name);
|
|
}
|
|
}
|
|
|
|
// return statement
|
|
emitReturn(onStack);
|
|
|
|
methodEpilogue();
|
|
}
|
|
|
|
/*
|
|
* @throws BytecodeGenerationException if something goes wrong when
|
|
* generating the byte code
|
|
*/
|
|
private byte[] toByteArray() {
|
|
try {
|
|
return cw.toByteArray();
|
|
} catch (RuntimeException e) {
|
|
throw new BytecodeGenerationException(e);
|
|
}
|
|
}
|
|
|
|
@SuppressWarnings("serial")
|
|
static final class BytecodeGenerationException extends RuntimeException {
|
|
BytecodeGenerationException(Exception cause) {
|
|
super(cause);
|
|
}
|
|
}
|
|
|
|
void emitArrayLoad(Name name) { emitArrayOp(name, Opcodes.AALOAD); }
|
|
void emitArrayStore(Name name) { emitArrayOp(name, Opcodes.AASTORE); }
|
|
void emitArrayLength(Name name) { emitArrayOp(name, Opcodes.ARRAYLENGTH); }
|
|
|
|
void emitArrayOp(Name name, int arrayOpcode) {
|
|
assert arrayOpcode == Opcodes.AALOAD || arrayOpcode == Opcodes.AASTORE || arrayOpcode == Opcodes.ARRAYLENGTH;
|
|
Class<?> elementType = name.function.methodType().parameterType(0).getComponentType();
|
|
assert elementType != null;
|
|
emitPushArguments(name, 0);
|
|
if (arrayOpcode != Opcodes.ARRAYLENGTH && elementType.isPrimitive()) {
|
|
Wrapper w = Wrapper.forPrimitiveType(elementType);
|
|
arrayOpcode = arrayInsnOpcode(arrayTypeCode(w), arrayOpcode);
|
|
}
|
|
mv.visitInsn(arrayOpcode);
|
|
}
|
|
|
|
/**
|
|
* Emit an invoke for the given name.
|
|
*/
|
|
void emitInvoke(Name name) {
|
|
assert(!name.isLinkerMethodInvoke()); // should use the static path for these
|
|
if (true) {
|
|
// push receiver
|
|
MethodHandle target = name.function.resolvedHandle();
|
|
assert(target != null) : name.exprString();
|
|
mv.visitLdcInsn(constantPlaceholder(target));
|
|
emitReferenceCast(MethodHandle.class, target);
|
|
} else {
|
|
// load receiver
|
|
emitAloadInsn(0);
|
|
emitReferenceCast(MethodHandle.class, null);
|
|
mv.visitFieldInsn(Opcodes.GETFIELD, MH, "form", LF_SIG);
|
|
mv.visitFieldInsn(Opcodes.GETFIELD, LF, "names", LFN_SIG);
|
|
// TODO more to come
|
|
}
|
|
|
|
// push arguments
|
|
emitPushArguments(name, 0);
|
|
|
|
// invocation
|
|
MethodType type = name.function.methodType();
|
|
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, MH, "invokeBasic", type.basicType().toMethodDescriptorString(), false);
|
|
}
|
|
|
|
private static Class<?>[] STATICALLY_INVOCABLE_PACKAGES = {
|
|
// Sample classes from each package we are willing to bind to statically:
|
|
java.lang.Object.class,
|
|
java.util.Arrays.class,
|
|
jdk.internal.misc.Unsafe.class
|
|
//MethodHandle.class already covered
|
|
};
|
|
|
|
static boolean isStaticallyInvocable(NamedFunction ... functions) {
|
|
for (NamedFunction nf : functions) {
|
|
if (!isStaticallyInvocable(nf.member())) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static boolean isStaticallyInvocable(Name name) {
|
|
return isStaticallyInvocable(name.function.member());
|
|
}
|
|
|
|
static boolean isStaticallyInvocable(MemberName member) {
|
|
if (member == null) return false;
|
|
if (member.isConstructor()) return false;
|
|
Class<?> cls = member.getDeclaringClass();
|
|
// Fast-path non-private members declared by MethodHandles, which is a common
|
|
// case
|
|
if (MethodHandle.class.isAssignableFrom(cls) && !member.isPrivate()) {
|
|
assert(isStaticallyInvocableType(member.getMethodOrFieldType()));
|
|
return true;
|
|
}
|
|
if (cls.isArray() || cls.isPrimitive())
|
|
return false; // FIXME
|
|
if (cls.isAnonymousClass() || cls.isLocalClass())
|
|
return false; // inner class of some sort
|
|
if (cls.getClassLoader() != MethodHandle.class.getClassLoader())
|
|
return false; // not on BCP
|
|
if (ReflectUtil.isVMAnonymousClass(cls)) // FIXME: switch to supported API once it is added
|
|
return false;
|
|
if (!isStaticallyInvocableType(member.getMethodOrFieldType()))
|
|
return false;
|
|
if (!member.isPrivate() && VerifyAccess.isSamePackage(MethodHandle.class, cls))
|
|
return true; // in java.lang.invoke package
|
|
if (member.isPublic() && isStaticallyNameable(cls))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
private static boolean isStaticallyInvocableType(MethodType mtype) {
|
|
if (!isStaticallyNameable(mtype.returnType()))
|
|
return false;
|
|
for (Class<?> ptype : mtype.parameterArray())
|
|
if (!isStaticallyNameable(ptype))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static boolean isStaticallyNameable(Class<?> cls) {
|
|
if (cls == Object.class)
|
|
return true;
|
|
if (MethodHandle.class.isAssignableFrom(cls)) {
|
|
assert(!ReflectUtil.isVMAnonymousClass(cls));
|
|
return true;
|
|
}
|
|
while (cls.isArray())
|
|
cls = cls.getComponentType();
|
|
if (cls.isPrimitive())
|
|
return true; // int[].class, for example
|
|
if (ReflectUtil.isVMAnonymousClass(cls)) // FIXME: switch to supported API once it is added
|
|
return false;
|
|
// could use VerifyAccess.isClassAccessible but the following is a safe approximation
|
|
if (cls.getClassLoader() != Object.class.getClassLoader())
|
|
return false;
|
|
if (VerifyAccess.isSamePackage(MethodHandle.class, cls))
|
|
return true;
|
|
if (!Modifier.isPublic(cls.getModifiers()))
|
|
return false;
|
|
for (Class<?> pkgcls : STATICALLY_INVOCABLE_PACKAGES) {
|
|
if (VerifyAccess.isSamePackage(pkgcls, cls))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void emitStaticInvoke(Name name) {
|
|
emitStaticInvoke(name.function.member(), name);
|
|
}
|
|
|
|
/**
|
|
* Emit an invoke for the given name, using the MemberName directly.
|
|
*/
|
|
void emitStaticInvoke(MemberName member, Name name) {
|
|
assert(member.equals(name.function.member()));
|
|
Class<?> defc = member.getDeclaringClass();
|
|
String cname = getInternalName(defc);
|
|
String mname = member.getName();
|
|
String mtype;
|
|
byte refKind = member.getReferenceKind();
|
|
if (refKind == REF_invokeSpecial) {
|
|
// in order to pass the verifier, we need to convert this to invokevirtual in all cases
|
|
assert(member.canBeStaticallyBound()) : member;
|
|
refKind = REF_invokeVirtual;
|
|
}
|
|
|
|
assert(!(member.getDeclaringClass().isInterface() && refKind == REF_invokeVirtual));
|
|
|
|
// push arguments
|
|
emitPushArguments(name, 0);
|
|
|
|
// invocation
|
|
if (member.isMethod()) {
|
|
mtype = member.getMethodType().toMethodDescriptorString();
|
|
mv.visitMethodInsn(refKindOpcode(refKind), cname, mname, mtype,
|
|
member.getDeclaringClass().isInterface());
|
|
} else {
|
|
mtype = MethodType.toFieldDescriptorString(member.getFieldType());
|
|
mv.visitFieldInsn(refKindOpcode(refKind), cname, mname, mtype);
|
|
}
|
|
// Issue a type assertion for the result, so we can avoid casts later.
|
|
if (name.type == L_TYPE) {
|
|
Class<?> rtype = member.getInvocationType().returnType();
|
|
assert(!rtype.isPrimitive());
|
|
if (rtype != Object.class && !rtype.isInterface()) {
|
|
assertStaticType(rtype, name);
|
|
}
|
|
}
|
|
}
|
|
|
|
void emitNewArray(Name name) throws InternalError {
|
|
Class<?> rtype = name.function.methodType().returnType();
|
|
if (name.arguments.length == 0) {
|
|
// The array will be a constant.
|
|
Object emptyArray;
|
|
try {
|
|
emptyArray = name.function.resolvedHandle().invoke();
|
|
} catch (Throwable ex) {
|
|
throw uncaughtException(ex);
|
|
}
|
|
assert(java.lang.reflect.Array.getLength(emptyArray) == 0);
|
|
assert(emptyArray.getClass() == rtype); // exact typing
|
|
mv.visitLdcInsn(constantPlaceholder(emptyArray));
|
|
emitReferenceCast(rtype, emptyArray);
|
|
return;
|
|
}
|
|
Class<?> arrayElementType = rtype.getComponentType();
|
|
assert(arrayElementType != null);
|
|
emitIconstInsn(name.arguments.length);
|
|
int xas = Opcodes.AASTORE;
|
|
if (!arrayElementType.isPrimitive()) {
|
|
mv.visitTypeInsn(Opcodes.ANEWARRAY, getInternalName(arrayElementType));
|
|
} else {
|
|
byte tc = arrayTypeCode(Wrapper.forPrimitiveType(arrayElementType));
|
|
xas = arrayInsnOpcode(tc, xas);
|
|
mv.visitIntInsn(Opcodes.NEWARRAY, tc);
|
|
}
|
|
// store arguments
|
|
for (int i = 0; i < name.arguments.length; i++) {
|
|
mv.visitInsn(Opcodes.DUP);
|
|
emitIconstInsn(i);
|
|
emitPushArgument(name, i);
|
|
mv.visitInsn(xas);
|
|
}
|
|
// the array is left on the stack
|
|
assertStaticType(rtype, name);
|
|
}
|
|
int refKindOpcode(byte refKind) {
|
|
switch (refKind) {
|
|
case REF_invokeVirtual: return Opcodes.INVOKEVIRTUAL;
|
|
case REF_invokeStatic: return Opcodes.INVOKESTATIC;
|
|
case REF_invokeSpecial: return Opcodes.INVOKESPECIAL;
|
|
case REF_invokeInterface: return Opcodes.INVOKEINTERFACE;
|
|
case REF_getField: return Opcodes.GETFIELD;
|
|
case REF_putField: return Opcodes.PUTFIELD;
|
|
case REF_getStatic: return Opcodes.GETSTATIC;
|
|
case REF_putStatic: return Opcodes.PUTSTATIC;
|
|
}
|
|
throw new InternalError("refKind="+refKind);
|
|
}
|
|
|
|
/**
|
|
* Emit bytecode for the selectAlternative idiom.
|
|
*
|
|
* The pattern looks like (Cf. MethodHandleImpl.makeGuardWithTest):
|
|
* <blockquote><pre>{@code
|
|
* Lambda(a0:L,a1:I)=>{
|
|
* t2:I=foo.test(a1:I);
|
|
* t3:L=MethodHandleImpl.selectAlternative(t2:I,(MethodHandle(int)int),(MethodHandle(int)int));
|
|
* t4:I=MethodHandle.invokeBasic(t3:L,a1:I);t4:I}
|
|
* }</pre></blockquote>
|
|
*/
|
|
private Name emitSelectAlternative(Name selectAlternativeName, Name invokeBasicName) {
|
|
assert isStaticallyInvocable(invokeBasicName);
|
|
|
|
Name receiver = (Name) invokeBasicName.arguments[0];
|
|
|
|
Label L_fallback = new Label();
|
|
Label L_done = new Label();
|
|
|
|
// load test result
|
|
emitPushArgument(selectAlternativeName, 0);
|
|
|
|
// if_icmpne L_fallback
|
|
mv.visitJumpInsn(Opcodes.IFEQ, L_fallback);
|
|
|
|
// invoke selectAlternativeName.arguments[1]
|
|
Class<?>[] preForkClasses = localClasses.clone();
|
|
emitPushArgument(selectAlternativeName, 1); // get 2nd argument of selectAlternative
|
|
emitAstoreInsn(receiver.index()); // store the MH in the receiver slot
|
|
emitStaticInvoke(invokeBasicName);
|
|
|
|
// goto L_done
|
|
mv.visitJumpInsn(Opcodes.GOTO, L_done);
|
|
|
|
// L_fallback:
|
|
mv.visitLabel(L_fallback);
|
|
|
|
// invoke selectAlternativeName.arguments[2]
|
|
System.arraycopy(preForkClasses, 0, localClasses, 0, preForkClasses.length);
|
|
emitPushArgument(selectAlternativeName, 2); // get 3rd argument of selectAlternative
|
|
emitAstoreInsn(receiver.index()); // store the MH in the receiver slot
|
|
emitStaticInvoke(invokeBasicName);
|
|
|
|
// L_done:
|
|
mv.visitLabel(L_done);
|
|
// for now do not bother to merge typestate; just reset to the dominator state
|
|
System.arraycopy(preForkClasses, 0, localClasses, 0, preForkClasses.length);
|
|
|
|
return invokeBasicName; // return what's on stack
|
|
}
|
|
|
|
/**
|
|
* Emit bytecode for the guardWithCatch idiom.
|
|
*
|
|
* The pattern looks like (Cf. MethodHandleImpl.makeGuardWithCatch):
|
|
* <blockquote><pre>{@code
|
|
* guardWithCatch=Lambda(a0:L,a1:L,a2:L,a3:L,a4:L,a5:L,a6:L,a7:L)=>{
|
|
* t8:L=MethodHandle.invokeBasic(a4:L,a6:L,a7:L);
|
|
* t9:L=MethodHandleImpl.guardWithCatch(a1:L,a2:L,a3:L,t8:L);
|
|
* t10:I=MethodHandle.invokeBasic(a5:L,t9:L);t10:I}
|
|
* }</pre></blockquote>
|
|
*
|
|
* It is compiled into bytecode equivalent of the following code:
|
|
* <blockquote><pre>{@code
|
|
* try {
|
|
* return a1.invokeBasic(a6, a7);
|
|
* } catch (Throwable e) {
|
|
* if (!a2.isInstance(e)) throw e;
|
|
* return a3.invokeBasic(ex, a6, a7);
|
|
* }}
|
|
*/
|
|
private Name emitGuardWithCatch(int pos) {
|
|
Name args = lambdaForm.names[pos];
|
|
Name invoker = lambdaForm.names[pos+1];
|
|
Name result = lambdaForm.names[pos+2];
|
|
|
|
Label L_startBlock = new Label();
|
|
Label L_endBlock = new Label();
|
|
Label L_handler = new Label();
|
|
Label L_done = new Label();
|
|
|
|
Class<?> returnType = result.function.resolvedHandle().type().returnType();
|
|
MethodType type = args.function.resolvedHandle().type()
|
|
.dropParameterTypes(0,1)
|
|
.changeReturnType(returnType);
|
|
|
|
mv.visitTryCatchBlock(L_startBlock, L_endBlock, L_handler, "java/lang/Throwable");
|
|
|
|
// Normal case
|
|
mv.visitLabel(L_startBlock);
|
|
// load target
|
|
emitPushArgument(invoker, 0);
|
|
emitPushArguments(args, 1); // skip 1st argument: method handle
|
|
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, MH, "invokeBasic", type.basicType().toMethodDescriptorString(), false);
|
|
mv.visitLabel(L_endBlock);
|
|
mv.visitJumpInsn(Opcodes.GOTO, L_done);
|
|
|
|
// Exceptional case
|
|
mv.visitLabel(L_handler);
|
|
|
|
// Check exception's type
|
|
mv.visitInsn(Opcodes.DUP);
|
|
// load exception class
|
|
emitPushArgument(invoker, 1);
|
|
mv.visitInsn(Opcodes.SWAP);
|
|
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Class", "isInstance", "(Ljava/lang/Object;)Z", false);
|
|
Label L_rethrow = new Label();
|
|
mv.visitJumpInsn(Opcodes.IFEQ, L_rethrow);
|
|
|
|
// Invoke catcher
|
|
// load catcher
|
|
emitPushArgument(invoker, 2);
|
|
mv.visitInsn(Opcodes.SWAP);
|
|
emitPushArguments(args, 1); // skip 1st argument: method handle
|
|
MethodType catcherType = type.insertParameterTypes(0, Throwable.class);
|
|
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, MH, "invokeBasic", catcherType.basicType().toMethodDescriptorString(), false);
|
|
mv.visitJumpInsn(Opcodes.GOTO, L_done);
|
|
|
|
mv.visitLabel(L_rethrow);
|
|
mv.visitInsn(Opcodes.ATHROW);
|
|
|
|
mv.visitLabel(L_done);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Emit bytecode for the tryFinally idiom.
|
|
* <p>
|
|
* The pattern looks like (Cf. MethodHandleImpl.makeTryFinally):
|
|
* <blockquote><pre>{@code
|
|
* // a0: BMH
|
|
* // a1: target, a2: cleanup
|
|
* // a3: box, a4: unbox
|
|
* // a5 (and following): arguments
|
|
* tryFinally=Lambda(a0:L,a1:L,a2:L,a3:L,a4:L,a5:L)=>{
|
|
* t6:L=MethodHandle.invokeBasic(a3:L,a5:L); // box the arguments into an Object[]
|
|
* t7:L=MethodHandleImpl.tryFinally(a1:L,a2:L,t6:L); // call the tryFinally executor
|
|
* t8:L=MethodHandle.invokeBasic(a4:L,t7:L);t8:L} // unbox the result; return the result
|
|
* }</pre></blockquote>
|
|
* <p>
|
|
* It is compiled into bytecode equivalent to the following code:
|
|
* <blockquote><pre>{@code
|
|
* Throwable t;
|
|
* Object r;
|
|
* try {
|
|
* r = a1.invokeBasic(a5);
|
|
* } catch (Throwable thrown) {
|
|
* t = thrown;
|
|
* throw t;
|
|
* } finally {
|
|
* r = a2.invokeBasic(t, r, a5);
|
|
* }
|
|
* return r;
|
|
* }</pre></blockquote>
|
|
* <p>
|
|
* Specifically, the bytecode will have the following form (the stack effects are given for the beginnings of
|
|
* blocks, and for the situations after executing the given instruction - the code will have a slightly different
|
|
* shape if the return type is {@code void}):
|
|
* <blockquote><pre>{@code
|
|
* TRY: (--)
|
|
* load target (-- target)
|
|
* load args (-- args... target)
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic (depends)
|
|
* FINALLY_NORMAL: (-- r)
|
|
* load cleanup (-- cleanup r)
|
|
* SWAP (-- r cleanup)
|
|
* ACONST_NULL (-- t r cleanup)
|
|
* SWAP (-- r t cleanup)
|
|
* load args (-- args... r t cleanup)
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic (-- r)
|
|
* GOTO DONE
|
|
* CATCH: (-- t)
|
|
* DUP (-- t t)
|
|
* FINALLY_EXCEPTIONAL: (-- t t)
|
|
* load cleanup (-- cleanup t t)
|
|
* SWAP (-- t cleanup t)
|
|
* load default for r (-- r t cleanup t)
|
|
* load args (-- args... r t cleanup t)
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic (-- r t)
|
|
* POP (-- t)
|
|
* ATHROW
|
|
* DONE: (-- r)
|
|
* }</pre></blockquote>
|
|
*/
|
|
private Name emitTryFinally(int pos) {
|
|
Name args = lambdaForm.names[pos];
|
|
Name invoker = lambdaForm.names[pos+1];
|
|
Name result = lambdaForm.names[pos+2];
|
|
|
|
Label lFrom = new Label();
|
|
Label lTo = new Label();
|
|
Label lCatch = new Label();
|
|
Label lDone = new Label();
|
|
|
|
Class<?> returnType = result.function.resolvedHandle().type().returnType();
|
|
boolean isNonVoid = returnType != void.class;
|
|
MethodType type = args.function.resolvedHandle().type()
|
|
.dropParameterTypes(0,1)
|
|
.changeReturnType(returnType);
|
|
MethodType cleanupType = type.insertParameterTypes(0, Throwable.class);
|
|
if (isNonVoid) {
|
|
cleanupType = cleanupType.insertParameterTypes(1, returnType);
|
|
}
|
|
String cleanupDesc = cleanupType.basicType().toMethodDescriptorString();
|
|
|
|
// exception handler table
|
|
mv.visitTryCatchBlock(lFrom, lTo, lCatch, "java/lang/Throwable");
|
|
|
|
// TRY:
|
|
mv.visitLabel(lFrom);
|
|
emitPushArgument(invoker, 0); // load target
|
|
emitPushArguments(args, 1); // load args (skip 0: method handle)
|
|
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, MH, "invokeBasic", type.basicType().toMethodDescriptorString(), false);
|
|
mv.visitLabel(lTo);
|
|
|
|
// FINALLY_NORMAL:
|
|
emitPushArgument(invoker, 1); // load cleanup
|
|
if (isNonVoid) {
|
|
mv.visitInsn(Opcodes.SWAP);
|
|
}
|
|
mv.visitInsn(Opcodes.ACONST_NULL);
|
|
if (isNonVoid) {
|
|
mv.visitInsn(Opcodes.SWAP);
|
|
}
|
|
emitPushArguments(args, 1); // load args (skip 0: method handle)
|
|
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, MH, "invokeBasic", cleanupDesc, false);
|
|
mv.visitJumpInsn(Opcodes.GOTO, lDone);
|
|
|
|
// CATCH:
|
|
mv.visitLabel(lCatch);
|
|
mv.visitInsn(Opcodes.DUP);
|
|
|
|
// FINALLY_EXCEPTIONAL:
|
|
emitPushArgument(invoker, 1); // load cleanup
|
|
mv.visitInsn(Opcodes.SWAP);
|
|
if (isNonVoid) {
|
|
emitZero(BasicType.basicType(returnType)); // load default for result
|
|
}
|
|
emitPushArguments(args, 1); // load args (skip 0: method handle)
|
|
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, MH, "invokeBasic", cleanupDesc, false);
|
|
if (isNonVoid) {
|
|
mv.visitInsn(Opcodes.POP);
|
|
}
|
|
mv.visitInsn(Opcodes.ATHROW);
|
|
|
|
// DONE:
|
|
mv.visitLabel(lDone);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Emit bytecode for the loop idiom.
|
|
* <p>
|
|
* The pattern looks like (Cf. MethodHandleImpl.loop):
|
|
* <blockquote><pre>{@code
|
|
* // a0: BMH
|
|
* // a1: LoopClauses (containing an array of arrays: inits, steps, preds, finis)
|
|
* // a2: box, a3: unbox
|
|
* // a4 (and following): arguments
|
|
* loop=Lambda(a0:L,a1:L,a2:L,a3:L,a4:L)=>{
|
|
* t5:L=MethodHandle.invokeBasic(a2:L,a4:L); // box the arguments into an Object[]
|
|
* t6:L=MethodHandleImpl.loop(bt:L,a1:L,t5:L); // call the loop executor (with supplied types in bt)
|
|
* t7:L=MethodHandle.invokeBasic(a3:L,t6:L);t7:L} // unbox the result; return the result
|
|
* }</pre></blockquote>
|
|
* <p>
|
|
* It is compiled into bytecode equivalent to the code seen in {@link MethodHandleImpl#loop(BasicType[],
|
|
* MethodHandleImpl.LoopClauses, Object...)}, with the difference that no arrays
|
|
* will be used for local state storage. Instead, the local state will be mapped to actual stack slots.
|
|
* <p>
|
|
* Bytecode generation applies an unrolling scheme to enable better bytecode generation regarding local state type
|
|
* handling. The generated bytecode will have the following form ({@code void} types are ignored for convenience).
|
|
* Assume there are {@code C} clauses in the loop.
|
|
* <blockquote><pre>{@code
|
|
* PREINIT: ALOAD_1
|
|
* CHECKCAST LoopClauses
|
|
* GETFIELD LoopClauses.clauses
|
|
* ASTORE clauseDataIndex // place the clauses 2-dimensional array on the stack
|
|
* INIT: (INIT_SEQ for clause 1)
|
|
* ...
|
|
* (INIT_SEQ for clause C)
|
|
* LOOP: (LOOP_SEQ for clause 1)
|
|
* ...
|
|
* (LOOP_SEQ for clause C)
|
|
* GOTO LOOP
|
|
* DONE: ...
|
|
* }</pre></blockquote>
|
|
* <p>
|
|
* The {@code INIT_SEQ_x} sequence for clause {@code x} (with {@code x} ranging from {@code 0} to {@code C-1}) has
|
|
* the following shape. Assume slot {@code vx} is used to hold the state for clause {@code x}.
|
|
* <blockquote><pre>{@code
|
|
* INIT_SEQ_x: ALOAD clauseDataIndex
|
|
* ICONST_0
|
|
* AALOAD // load the inits array
|
|
* ICONST x
|
|
* AALOAD // load the init handle for clause x
|
|
* load args
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic
|
|
* store vx
|
|
* }</pre></blockquote>
|
|
* <p>
|
|
* The {@code LOOP_SEQ_x} sequence for clause {@code x} (with {@code x} ranging from {@code 0} to {@code C-1}) has
|
|
* the following shape. Again, assume slot {@code vx} is used to hold the state for clause {@code x}.
|
|
* <blockquote><pre>{@code
|
|
* LOOP_SEQ_x: ALOAD clauseDataIndex
|
|
* ICONST_1
|
|
* AALOAD // load the steps array
|
|
* ICONST x
|
|
* AALOAD // load the step handle for clause x
|
|
* load locals
|
|
* load args
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic
|
|
* store vx
|
|
* ALOAD clauseDataIndex
|
|
* ICONST_2
|
|
* AALOAD // load the preds array
|
|
* ICONST x
|
|
* AALOAD // load the pred handle for clause x
|
|
* load locals
|
|
* load args
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic
|
|
* IFNE LOOP_SEQ_x+1 // predicate returned false -> jump to next clause
|
|
* ALOAD clauseDataIndex
|
|
* ICONST_3
|
|
* AALOAD // load the finis array
|
|
* ICONST x
|
|
* AALOAD // load the fini handle for clause x
|
|
* load locals
|
|
* load args
|
|
* INVOKEVIRTUAL MethodHandle.invokeBasic
|
|
* GOTO DONE // jump beyond end of clauses to return from loop
|
|
* }</pre></blockquote>
|
|
*/
|
|
private Name emitLoop(int pos) {
|
|
Name args = lambdaForm.names[pos];
|
|
Name invoker = lambdaForm.names[pos+1];
|
|
Name result = lambdaForm.names[pos+2];
|
|
|
|
// extract clause and loop-local state types
|
|
// find the type info in the loop invocation
|
|
BasicType[] loopClauseTypes = (BasicType[]) invoker.arguments[0];
|
|
Class<?>[] loopLocalStateTypes = Stream.of(loopClauseTypes).
|
|
filter(bt -> bt != BasicType.V_TYPE).map(BasicType::basicTypeClass).toArray(Class<?>[]::new);
|
|
Class<?>[] localTypes = new Class<?>[loopLocalStateTypes.length + 1];
|
|
localTypes[0] = MethodHandleImpl.LoopClauses.class;
|
|
System.arraycopy(loopLocalStateTypes, 0, localTypes, 1, loopLocalStateTypes.length);
|
|
|
|
final int clauseDataIndex = extendLocalsMap(localTypes);
|
|
final int firstLoopStateIndex = clauseDataIndex + 1;
|
|
|
|
Class<?> returnType = result.function.resolvedHandle().type().returnType();
|
|
MethodType loopType = args.function.resolvedHandle().type()
|
|
.dropParameterTypes(0,1)
|
|
.changeReturnType(returnType);
|
|
MethodType loopHandleType = loopType.insertParameterTypes(0, loopLocalStateTypes);
|
|
MethodType predType = loopHandleType.changeReturnType(boolean.class);
|
|
MethodType finiType = loopHandleType;
|
|
|
|
final int nClauses = loopClauseTypes.length;
|
|
|
|
// indices to invoker arguments to load method handle arrays
|
|
final int inits = 1;
|
|
final int steps = 2;
|
|
final int preds = 3;
|
|
final int finis = 4;
|
|
|
|
Label lLoop = new Label();
|
|
Label lDone = new Label();
|
|
Label lNext;
|
|
|
|
// PREINIT:
|
|
emitPushArgument(MethodHandleImpl.LoopClauses.class, invoker.arguments[1]);
|
|
mv.visitFieldInsn(Opcodes.GETFIELD, LOOP_CLAUSES, "clauses", MHARY2);
|
|
emitAstoreInsn(clauseDataIndex);
|
|
|
|
// INIT:
|
|
for (int c = 0, state = 0; c < nClauses; ++c) {
|
|
MethodType cInitType = loopType.changeReturnType(loopClauseTypes[c].basicTypeClass());
|
|
emitLoopHandleInvoke(invoker, inits, c, args, false, cInitType, loopLocalStateTypes, clauseDataIndex,
|
|
firstLoopStateIndex);
|
|
if (cInitType.returnType() != void.class) {
|
|
emitStoreInsn(BasicType.basicType(cInitType.returnType()), firstLoopStateIndex + state);
|
|
++state;
|
|
}
|
|
}
|
|
|
|
// LOOP:
|
|
mv.visitLabel(lLoop);
|
|
|
|
for (int c = 0, state = 0; c < nClauses; ++c) {
|
|
lNext = new Label();
|
|
|
|
MethodType stepType = loopHandleType.changeReturnType(loopClauseTypes[c].basicTypeClass());
|
|
boolean isVoid = stepType.returnType() == void.class;
|
|
|
|
// invoke loop step
|
|
emitLoopHandleInvoke(invoker, steps, c, args, true, stepType, loopLocalStateTypes, clauseDataIndex,
|
|
firstLoopStateIndex);
|
|
if (!isVoid) {
|
|
emitStoreInsn(BasicType.basicType(stepType.returnType()), firstLoopStateIndex + state);
|
|
++state;
|
|
}
|
|
|
|
// invoke loop predicate
|
|
emitLoopHandleInvoke(invoker, preds, c, args, true, predType, loopLocalStateTypes, clauseDataIndex,
|
|
firstLoopStateIndex);
|
|
mv.visitJumpInsn(Opcodes.IFNE, lNext);
|
|
|
|
// invoke fini
|
|
emitLoopHandleInvoke(invoker, finis, c, args, true, finiType, loopLocalStateTypes, clauseDataIndex,
|
|
firstLoopStateIndex);
|
|
mv.visitJumpInsn(Opcodes.GOTO, lDone);
|
|
|
|
// this is the beginning of the next loop clause
|
|
mv.visitLabel(lNext);
|
|
}
|
|
|
|
mv.visitJumpInsn(Opcodes.GOTO, lLoop);
|
|
|
|
// DONE:
|
|
mv.visitLabel(lDone);
|
|
|
|
return result;
|
|
}
|
|
|
|
private int extendLocalsMap(Class<?>[] types) {
|
|
int firstSlot = localsMap.length - 1;
|
|
localsMap = Arrays.copyOf(localsMap, localsMap.length + types.length);
|
|
localClasses = Arrays.copyOf(localClasses, localClasses.length + types.length);
|
|
System.arraycopy(types, 0, localClasses, firstSlot, types.length);
|
|
int index = localsMap[firstSlot - 1] + 1;
|
|
int lastSlots = 0;
|
|
for (int i = 0; i < types.length; ++i) {
|
|
localsMap[firstSlot + i] = index;
|
|
lastSlots = BasicType.basicType(localClasses[firstSlot + i]).basicTypeSlots();
|
|
index += lastSlots;
|
|
}
|
|
localsMap[localsMap.length - 1] = index - lastSlots;
|
|
return firstSlot;
|
|
}
|
|
|
|
private void emitLoopHandleInvoke(Name holder, int handles, int clause, Name args, boolean pushLocalState,
|
|
MethodType type, Class<?>[] loopLocalStateTypes, int clauseDataSlot,
|
|
int firstLoopStateSlot) {
|
|
// load handle for clause
|
|
emitPushClauseArray(clauseDataSlot, handles);
|
|
emitIconstInsn(clause);
|
|
mv.visitInsn(Opcodes.AALOAD);
|
|
// load loop state (preceding the other arguments)
|
|
if (pushLocalState) {
|
|
for (int s = 0; s < loopLocalStateTypes.length; ++s) {
|
|
emitLoadInsn(BasicType.basicType(loopLocalStateTypes[s]), firstLoopStateSlot + s);
|
|
}
|
|
}
|
|
// load loop args (skip 0: method handle)
|
|
emitPushArguments(args, 1);
|
|
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, MH, "invokeBasic", type.toMethodDescriptorString(), false);
|
|
}
|
|
|
|
private void emitPushClauseArray(int clauseDataSlot, int which) {
|
|
emitAloadInsn(clauseDataSlot);
|
|
emitIconstInsn(which - 1);
|
|
mv.visitInsn(Opcodes.AALOAD);
|
|
}
|
|
|
|
private void emitZero(BasicType type) {
|
|
switch (type) {
|
|
case I_TYPE: mv.visitInsn(Opcodes.ICONST_0); break;
|
|
case J_TYPE: mv.visitInsn(Opcodes.LCONST_0); break;
|
|
case F_TYPE: mv.visitInsn(Opcodes.FCONST_0); break;
|
|
case D_TYPE: mv.visitInsn(Opcodes.DCONST_0); break;
|
|
case L_TYPE: mv.visitInsn(Opcodes.ACONST_NULL); break;
|
|
default: throw new InternalError("unknown type: " + type);
|
|
}
|
|
}
|
|
|
|
private void emitPushArguments(Name args, int start) {
|
|
MethodType type = args.function.methodType();
|
|
for (int i = start; i < args.arguments.length; i++) {
|
|
emitPushArgument(type.parameterType(i), args.arguments[i]);
|
|
}
|
|
}
|
|
|
|
private void emitPushArgument(Name name, int paramIndex) {
|
|
Object arg = name.arguments[paramIndex];
|
|
Class<?> ptype = name.function.methodType().parameterType(paramIndex);
|
|
emitPushArgument(ptype, arg);
|
|
}
|
|
|
|
private void emitPushArgument(Class<?> ptype, Object arg) {
|
|
BasicType bptype = basicType(ptype);
|
|
if (arg instanceof Name) {
|
|
Name n = (Name) arg;
|
|
emitLoadInsn(n.type, n.index());
|
|
emitImplicitConversion(n.type, ptype, n);
|
|
} else if ((arg == null || arg instanceof String) && bptype == L_TYPE) {
|
|
emitConst(arg);
|
|
} else {
|
|
if (Wrapper.isWrapperType(arg.getClass()) && bptype != L_TYPE) {
|
|
emitConst(arg);
|
|
} else {
|
|
mv.visitLdcInsn(constantPlaceholder(arg));
|
|
emitImplicitConversion(L_TYPE, ptype, arg);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Store the name to its local, if necessary.
|
|
*/
|
|
private void emitStoreResult(Name name) {
|
|
if (name != null && name.type != V_TYPE) {
|
|
// non-void: actually assign
|
|
emitStoreInsn(name.type, name.index());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Emits a return statement from a LF invoker. If required, the result type is cast to the correct return type.
|
|
*/
|
|
private void emitReturn(Name onStack) {
|
|
// return statement
|
|
Class<?> rclass = invokerType.returnType();
|
|
BasicType rtype = lambdaForm.returnType();
|
|
assert(rtype == basicType(rclass)); // must agree
|
|
if (rtype == V_TYPE) {
|
|
// void
|
|
mv.visitInsn(Opcodes.RETURN);
|
|
// it doesn't matter what rclass is; the JVM will discard any value
|
|
} else {
|
|
LambdaForm.Name rn = lambdaForm.names[lambdaForm.result];
|
|
|
|
// put return value on the stack if it is not already there
|
|
if (rn != onStack) {
|
|
emitLoadInsn(rtype, lambdaForm.result);
|
|
}
|
|
|
|
emitImplicitConversion(rtype, rclass, rn);
|
|
|
|
// generate actual return statement
|
|
emitReturnInsn(rtype);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Emit a type conversion bytecode casting from "from" to "to".
|
|
*/
|
|
private void emitPrimCast(Wrapper from, Wrapper to) {
|
|
// Here's how.
|
|
// - indicates forbidden
|
|
// <-> indicates implicit
|
|
// to ----> boolean byte short char int long float double
|
|
// from boolean <-> - - - - - - -
|
|
// byte - <-> i2s i2c <-> i2l i2f i2d
|
|
// short - i2b <-> i2c <-> i2l i2f i2d
|
|
// char - i2b i2s <-> <-> i2l i2f i2d
|
|
// int - i2b i2s i2c <-> i2l i2f i2d
|
|
// long - l2i,i2b l2i,i2s l2i,i2c l2i <-> l2f l2d
|
|
// float - f2i,i2b f2i,i2s f2i,i2c f2i f2l <-> f2d
|
|
// double - d2i,i2b d2i,i2s d2i,i2c d2i d2l d2f <->
|
|
if (from == to) {
|
|
// no cast required, should be dead code anyway
|
|
return;
|
|
}
|
|
if (from.isSubwordOrInt()) {
|
|
// cast from {byte,short,char,int} to anything
|
|
emitI2X(to);
|
|
} else {
|
|
// cast from {long,float,double} to anything
|
|
if (to.isSubwordOrInt()) {
|
|
// cast to {byte,short,char,int}
|
|
emitX2I(from);
|
|
if (to.bitWidth() < 32) {
|
|
// targets other than int require another conversion
|
|
emitI2X(to);
|
|
}
|
|
} else {
|
|
// cast to {long,float,double} - this is verbose
|
|
boolean error = false;
|
|
switch (from) {
|
|
case LONG:
|
|
switch (to) {
|
|
case FLOAT: mv.visitInsn(Opcodes.L2F); break;
|
|
case DOUBLE: mv.visitInsn(Opcodes.L2D); break;
|
|
default: error = true; break;
|
|
}
|
|
break;
|
|
case FLOAT:
|
|
switch (to) {
|
|
case LONG : mv.visitInsn(Opcodes.F2L); break;
|
|
case DOUBLE: mv.visitInsn(Opcodes.F2D); break;
|
|
default: error = true; break;
|
|
}
|
|
break;
|
|
case DOUBLE:
|
|
switch (to) {
|
|
case LONG : mv.visitInsn(Opcodes.D2L); break;
|
|
case FLOAT: mv.visitInsn(Opcodes.D2F); break;
|
|
default: error = true; break;
|
|
}
|
|
break;
|
|
default:
|
|
error = true;
|
|
break;
|
|
}
|
|
if (error) {
|
|
throw new IllegalStateException("unhandled prim cast: " + from + "2" + to);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
private void emitI2X(Wrapper type) {
|
|
switch (type) {
|
|
case BYTE: mv.visitInsn(Opcodes.I2B); break;
|
|
case SHORT: mv.visitInsn(Opcodes.I2S); break;
|
|
case CHAR: mv.visitInsn(Opcodes.I2C); break;
|
|
case INT: /* naught */ break;
|
|
case LONG: mv.visitInsn(Opcodes.I2L); break;
|
|
case FLOAT: mv.visitInsn(Opcodes.I2F); break;
|
|
case DOUBLE: mv.visitInsn(Opcodes.I2D); break;
|
|
case BOOLEAN:
|
|
// For compatibility with ValueConversions and explicitCastArguments:
|
|
mv.visitInsn(Opcodes.ICONST_1);
|
|
mv.visitInsn(Opcodes.IAND);
|
|
break;
|
|
default: throw new InternalError("unknown type: " + type);
|
|
}
|
|
}
|
|
|
|
private void emitX2I(Wrapper type) {
|
|
switch (type) {
|
|
case LONG: mv.visitInsn(Opcodes.L2I); break;
|
|
case FLOAT: mv.visitInsn(Opcodes.F2I); break;
|
|
case DOUBLE: mv.visitInsn(Opcodes.D2I); break;
|
|
default: throw new InternalError("unknown type: " + type);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Generate bytecode for a LambdaForm.vmentry which calls interpretWithArguments.
|
|
*/
|
|
static MemberName generateLambdaFormInterpreterEntryPoint(MethodType mt) {
|
|
assert(isValidSignature(basicTypeSignature(mt)));
|
|
String name = "interpret_"+basicTypeChar(mt.returnType());
|
|
MethodType type = mt; // includes leading argument
|
|
type = type.changeParameterType(0, MethodHandle.class);
|
|
InvokerBytecodeGenerator g = new InvokerBytecodeGenerator("LFI", name, type);
|
|
return g.loadMethod(g.generateLambdaFormInterpreterEntryPointBytes());
|
|
}
|
|
|
|
private byte[] generateLambdaFormInterpreterEntryPointBytes() {
|
|
classFilePrologue();
|
|
methodPrologue();
|
|
|
|
// Suppress this method in backtraces displayed to the user.
|
|
mv.visitAnnotation(HIDDEN_SIG, true);
|
|
|
|
// Don't inline the interpreter entry.
|
|
mv.visitAnnotation(DONTINLINE_SIG, true);
|
|
|
|
// create parameter array
|
|
emitIconstInsn(invokerType.parameterCount());
|
|
mv.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
|
|
|
|
// fill parameter array
|
|
for (int i = 0; i < invokerType.parameterCount(); i++) {
|
|
Class<?> ptype = invokerType.parameterType(i);
|
|
mv.visitInsn(Opcodes.DUP);
|
|
emitIconstInsn(i);
|
|
emitLoadInsn(basicType(ptype), i);
|
|
// box if primitive type
|
|
if (ptype.isPrimitive()) {
|
|
emitBoxing(Wrapper.forPrimitiveType(ptype));
|
|
}
|
|
mv.visitInsn(Opcodes.AASTORE);
|
|
}
|
|
// invoke
|
|
emitAloadInsn(0);
|
|
mv.visitFieldInsn(Opcodes.GETFIELD, MH, "form", "Ljava/lang/invoke/LambdaForm;");
|
|
mv.visitInsn(Opcodes.SWAP); // swap form and array; avoid local variable
|
|
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, LF, "interpretWithArguments", "([Ljava/lang/Object;)Ljava/lang/Object;", false);
|
|
|
|
// maybe unbox
|
|
Class<?> rtype = invokerType.returnType();
|
|
if (rtype.isPrimitive() && rtype != void.class) {
|
|
emitUnboxing(Wrapper.forPrimitiveType(rtype));
|
|
}
|
|
|
|
// return statement
|
|
emitReturnInsn(basicType(rtype));
|
|
|
|
methodEpilogue();
|
|
bogusMethod(invokerType);
|
|
|
|
final byte[] classFile = cw.toByteArray();
|
|
maybeDump(classFile);
|
|
return classFile;
|
|
}
|
|
|
|
/**
|
|
* Generate bytecode for a NamedFunction invoker.
|
|
*/
|
|
static MemberName generateNamedFunctionInvoker(MethodTypeForm typeForm) {
|
|
MethodType invokerType = NamedFunction.INVOKER_METHOD_TYPE;
|
|
String invokerName = "invoke_" + shortenSignature(basicTypeSignature(typeForm.erasedType()));
|
|
InvokerBytecodeGenerator g = new InvokerBytecodeGenerator("NFI", invokerName, invokerType);
|
|
return g.loadMethod(g.generateNamedFunctionInvokerImpl(typeForm));
|
|
}
|
|
|
|
private byte[] generateNamedFunctionInvokerImpl(MethodTypeForm typeForm) {
|
|
MethodType dstType = typeForm.erasedType();
|
|
classFilePrologue();
|
|
methodPrologue();
|
|
|
|
// Suppress this method in backtraces displayed to the user.
|
|
mv.visitAnnotation(HIDDEN_SIG, true);
|
|
|
|
// Force inlining of this invoker method.
|
|
mv.visitAnnotation(FORCEINLINE_SIG, true);
|
|
|
|
// Load receiver
|
|
emitAloadInsn(0);
|
|
|
|
// Load arguments from array
|
|
for (int i = 0; i < dstType.parameterCount(); i++) {
|
|
emitAloadInsn(1);
|
|
emitIconstInsn(i);
|
|
mv.visitInsn(Opcodes.AALOAD);
|
|
|
|
// Maybe unbox
|
|
Class<?> dptype = dstType.parameterType(i);
|
|
if (dptype.isPrimitive()) {
|
|
Wrapper dstWrapper = Wrapper.forBasicType(dptype);
|
|
Wrapper srcWrapper = dstWrapper.isSubwordOrInt() ? Wrapper.INT : dstWrapper; // narrow subword from int
|
|
emitUnboxing(srcWrapper);
|
|
emitPrimCast(srcWrapper, dstWrapper);
|
|
}
|
|
}
|
|
|
|
// Invoke
|
|
String targetDesc = dstType.basicType().toMethodDescriptorString();
|
|
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, MH, "invokeBasic", targetDesc, false);
|
|
|
|
// Box primitive types
|
|
Class<?> rtype = dstType.returnType();
|
|
if (rtype != void.class && rtype.isPrimitive()) {
|
|
Wrapper srcWrapper = Wrapper.forBasicType(rtype);
|
|
Wrapper dstWrapper = srcWrapper.isSubwordOrInt() ? Wrapper.INT : srcWrapper; // widen subword to int
|
|
// boolean casts not allowed
|
|
emitPrimCast(srcWrapper, dstWrapper);
|
|
emitBoxing(dstWrapper);
|
|
}
|
|
|
|
// If the return type is void we return a null reference.
|
|
if (rtype == void.class) {
|
|
mv.visitInsn(Opcodes.ACONST_NULL);
|
|
}
|
|
emitReturnInsn(L_TYPE); // NOTE: NamedFunction invokers always return a reference value.
|
|
|
|
methodEpilogue();
|
|
bogusMethod(dstType);
|
|
|
|
final byte[] classFile = cw.toByteArray();
|
|
maybeDump(classFile);
|
|
return classFile;
|
|
}
|
|
|
|
/**
|
|
* Emit a bogus method that just loads some string constants. This is to get the constants into the constant pool
|
|
* for debugging purposes.
|
|
*/
|
|
private void bogusMethod(Object os) {
|
|
if (DUMP_CLASS_FILES) {
|
|
mv = cw.visitMethod(Opcodes.ACC_STATIC, "dummy", "()V", null, null);
|
|
mv.visitLdcInsn(os.toString());
|
|
mv.visitInsn(Opcodes.POP);
|
|
mv.visitInsn(Opcodes.RETURN);
|
|
mv.visitMaxs(0, 0);
|
|
mv.visitEnd();
|
|
}
|
|
}
|
|
}
|