1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.lang.invoke; 27 28 import java.util.Map; 29 import jdk.internal.org.objectweb.asm.ClassWriter; 30 import jdk.internal.org.objectweb.asm.Opcodes; 31 32 /** 33 * Helper class to assist the GenerateJLIClassesPlugin to get access to 34 * generate classes ahead of time. 35 */ 36 class GenerateJLIClassesHelper { 37 38 static byte[] generateDMHClassBytes(String className, 39 MethodType[] methodTypes, int[] types) { 40 LambdaForm[] forms = new LambdaForm[methodTypes.length]; 41 for (int i = 0; i < forms.length; i++) { 42 forms[i] = DirectMethodHandle.makePreparedLambdaForm(methodTypes[i], 43 types[i]); 44 methodTypes[i] = forms[i].methodType(); 45 } 46 return generateCodeBytesForLFs(className, forms, methodTypes); 47 } 48 49 /* 50 * Generate customized code for a set of LambdaForms of specified types into 51 * a class with a specified name. 52 */ 53 private static byte[] generateCodeBytesForLFs(String className, 54 LambdaForm[] forms, MethodType[] types) { 55 assert(forms.length == types.length); 56 57 ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES); 58 cw.visit(Opcodes.V1_8, Opcodes.ACC_PRIVATE + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER, 59 className, null, InvokerBytecodeGenerator.INVOKER_SUPER_NAME, null); 60 cw.visitSource(className.substring(className.lastIndexOf('/') + 1), null); 61 for (int i = 0; i < forms.length; i++) { 62 InvokerBytecodeGenerator g 63 = new InvokerBytecodeGenerator(className, forms[i], types[i]); 64 g.setClassWriter(cw); 65 g.addMethod(); 66 } 67 return cw.toByteArray(); 68 } 69 70 static Map.Entry<String, byte[]> generateConcreteBMHClassBytes( 71 final String types) { 72 for (char c : types.toCharArray()) { 73 if ("LIJFD".indexOf(c) < 0) { 74 throw new IllegalArgumentException("All characters must " 75 + "correspond to a basic field type: LIJFD"); 76 } 77 } 78 String shortTypes = LambdaForm.shortenSignature(types); 79 final String className = 80 BoundMethodHandle.Factory.speciesInternalClassName(shortTypes); 81 return Map.entry(className, 82 BoundMethodHandle.Factory.generateConcreteBMHClassBytes( 83 shortTypes, types, className)); 84 } 85 }