86 lines
3.6 KiB
Java
86 lines
3.6 KiB
Java
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/*
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* Copyright (c) 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 java.util.Map;
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import jdk.internal.org.objectweb.asm.ClassWriter;
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import jdk.internal.org.objectweb.asm.Opcodes;
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/**
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* Helper class to assist the GenerateJLIClassesPlugin to get access to
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* generate classes ahead of time.
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*/
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class GenerateJLIClassesHelper {
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static byte[] generateDMHClassBytes(String className,
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MethodType[] methodTypes, int[] types) {
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LambdaForm[] forms = new LambdaForm[methodTypes.length];
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for (int i = 0; i < forms.length; i++) {
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forms[i] = DirectMethodHandle.makePreparedLambdaForm(methodTypes[i],
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types[i]);
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methodTypes[i] = forms[i].methodType();
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}
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return generateCodeBytesForLFs(className, forms, methodTypes);
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}
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/*
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* Generate customized code for a set of LambdaForms of specified types into
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* a class with a specified name.
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*/
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private static byte[] generateCodeBytesForLFs(String className,
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LambdaForm[] forms, MethodType[] types) {
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assert(forms.length == types.length);
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ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
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cw.visit(Opcodes.V1_8, Opcodes.ACC_PRIVATE + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER,
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className, null, InvokerBytecodeGenerator.INVOKER_SUPER_NAME, null);
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cw.visitSource(className.substring(className.lastIndexOf('/') + 1), null);
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for (int i = 0; i < forms.length; i++) {
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InvokerBytecodeGenerator g
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= new InvokerBytecodeGenerator(className, forms[i], types[i]);
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g.setClassWriter(cw);
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g.addMethod();
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}
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return cw.toByteArray();
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}
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static Map.Entry<String, byte[]> generateConcreteBMHClassBytes(
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final String types) {
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for (char c : types.toCharArray()) {
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if ("LIJFD".indexOf(c) < 0) {
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throw new IllegalArgumentException("All characters must "
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+ "correspond to a basic field type: LIJFD");
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}
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}
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String shortTypes = LambdaForm.shortenSignature(types);
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final String className =
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BoundMethodHandle.Factory.speciesInternalClassName(shortTypes);
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return Map.entry(className,
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BoundMethodHandle.Factory.generateConcreteBMHClassBytes(
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shortTypes, types, className));
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}
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}
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