| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.lang.invoke; |
| |
| import java.util.Map; |
| import jdk.internal.org.objectweb.asm.ClassWriter; |
| import jdk.internal.org.objectweb.asm.Opcodes; |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import sun.invoke.util.Wrapper; |
| |
| import static java.lang.invoke.MethodHandleNatives.Constants.*; |
| |
| /** |
| * Helper class to assist the GenerateJLIClassesPlugin to get access to |
| * generate classes ahead of time. |
| */ |
| class GenerateJLIClassesHelper { |
| |
| static byte[] generateBasicFormsClassBytes(String className) { |
| ArrayList<LambdaForm> forms = new ArrayList<>(); |
| ArrayList<String> names = new ArrayList<>(); |
| HashSet<String> dedupSet = new HashSet<>(); |
| for (LambdaForm.BasicType type : LambdaForm.BasicType.values()) { |
| LambdaForm zero = LambdaForm.zeroForm(type); |
| String name = zero.kind.defaultLambdaName |
| + "_" + zero.returnType().basicTypeChar(); |
| if (dedupSet.add(name)) { |
| names.add(name); |
| forms.add(zero); |
| } |
| |
| LambdaForm identity = LambdaForm.identityForm(type); |
| name = identity.kind.defaultLambdaName |
| + "_" + identity.returnType().basicTypeChar(); |
| if (dedupSet.add(name)) { |
| names.add(name); |
| forms.add(identity); |
| } |
| } |
| return generateCodeBytesForLFs(className, |
| names.toArray(new String[0]), |
| forms.toArray(new LambdaForm[0])); |
| } |
| |
| static byte[] generateDirectMethodHandleHolderClassBytes(String className, |
| MethodType[] methodTypes, int[] types) { |
| ArrayList<LambdaForm> forms = new ArrayList<>(); |
| ArrayList<String> names = new ArrayList<>(); |
| for (int i = 0; i < methodTypes.length; i++) { |
| LambdaForm form = DirectMethodHandle |
| .makePreparedLambdaForm(methodTypes[i], types[i]); |
| forms.add(form); |
| names.add(form.kind.defaultLambdaName); |
| } |
| for (Wrapper wrapper : Wrapper.values()) { |
| if (wrapper == Wrapper.VOID) { |
| continue; |
| } |
| for (byte b = DirectMethodHandle.AF_GETFIELD; b < DirectMethodHandle.AF_LIMIT; b++) { |
| int ftype = DirectMethodHandle.ftypeKind(wrapper.primitiveType()); |
| LambdaForm form = DirectMethodHandle |
| .makePreparedFieldLambdaForm(b, /*isVolatile*/false, ftype); |
| if (form.kind != LambdaForm.Kind.GENERIC) { |
| forms.add(form); |
| names.add(form.kind.defaultLambdaName); |
| } |
| // volatile |
| form = DirectMethodHandle |
| .makePreparedFieldLambdaForm(b, /*isVolatile*/true, ftype); |
| if (form.kind != LambdaForm.Kind.GENERIC) { |
| forms.add(form); |
| names.add(form.kind.defaultLambdaName); |
| } |
| } |
| } |
| return generateCodeBytesForLFs(className, |
| names.toArray(new String[0]), |
| forms.toArray(new LambdaForm[0])); |
| } |
| |
| static byte[] generateDelegatingMethodHandleHolderClassBytes(String className, |
| MethodType[] methodTypes) { |
| |
| HashSet<MethodType> dedupSet = new HashSet<>(); |
| ArrayList<LambdaForm> forms = new ArrayList<>(); |
| ArrayList<String> names = new ArrayList<>(); |
| for (int i = 0; i < methodTypes.length; i++) { |
| // generate methods representing the DelegatingMethodHandle |
| if (dedupSet.add(methodTypes[i])) { |
| // reinvokers are variant with the associated SpeciesData |
| // and shape of the target LF, but we can easily pregenerate |
| // the basic reinvokers associated with Species_L. Ultimately we |
| // may want to consider pregenerating more of these, which will |
| // require an even more complex naming scheme |
| LambdaForm reinvoker = makeReinvokerFor(methodTypes[i]); |
| forms.add(reinvoker); |
| String speciesSig = BoundMethodHandle |
| .speciesData(reinvoker).fieldSignature(); |
| assert(speciesSig.equals("L")); |
| names.add(reinvoker.kind.defaultLambdaName + "_" + speciesSig); |
| |
| LambdaForm delegate = makeDelegateFor(methodTypes[i]); |
| forms.add(delegate); |
| names.add(delegate.kind.defaultLambdaName); |
| } |
| } |
| return generateCodeBytesForLFs(className, |
| names.toArray(new String[0]), |
| forms.toArray(new LambdaForm[0])); |
| } |
| |
| static byte[] generateInvokersHolderClassBytes(String className, |
| MethodType[] methodTypes) { |
| |
| HashSet<MethodType> dedupSet = new HashSet<>(); |
| ArrayList<LambdaForm> forms = new ArrayList<>(); |
| ArrayList<String> names = new ArrayList<>(); |
| int[] types = { |
| MethodTypeForm.LF_EX_LINKER, |
| MethodTypeForm.LF_EX_INVOKER, |
| MethodTypeForm.LF_GEN_LINKER, |
| MethodTypeForm.LF_GEN_INVOKER |
| }; |
| for (int i = 0; i < methodTypes.length; i++) { |
| // generate methods representing invokers of the specified type |
| if (dedupSet.add(methodTypes[i])) { |
| for (int type : types) { |
| LambdaForm invokerForm = Invokers.invokeHandleForm(methodTypes[i], |
| /*customized*/false, type); |
| forms.add(invokerForm); |
| names.add(invokerForm.kind.defaultLambdaName); |
| } |
| } |
| } |
| return generateCodeBytesForLFs(className, |
| names.toArray(new String[0]), |
| forms.toArray(new LambdaForm[0])); |
| } |
| |
| /* |
| * Generate customized code for a set of LambdaForms of specified types into |
| * a class with a specified name. |
| */ |
| private static byte[] generateCodeBytesForLFs(String className, |
| String[] names, LambdaForm[] forms) { |
| |
| ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES); |
| cw.visit(Opcodes.V1_8, Opcodes.ACC_PRIVATE + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER, |
| className, null, InvokerBytecodeGenerator.INVOKER_SUPER_NAME, null); |
| cw.visitSource(className.substring(className.lastIndexOf('/') + 1), null); |
| |
| for (int i = 0; i < forms.length; i++) { |
| addMethod(className, names[i], forms[i], |
| forms[i].methodType(), cw); |
| } |
| return cw.toByteArray(); |
| } |
| |
| private static void addMethod(String className, String methodName, LambdaForm form, |
| MethodType type, ClassWriter cw) { |
| InvokerBytecodeGenerator g |
| = new InvokerBytecodeGenerator(className, methodName, form, type); |
| g.setClassWriter(cw); |
| g.addMethod(); |
| } |
| |
| private static LambdaForm makeReinvokerFor(MethodType type) { |
| MethodHandle emptyHandle = MethodHandles.empty(type); |
| return DelegatingMethodHandle.makeReinvokerForm(emptyHandle, |
| MethodTypeForm.LF_REBIND, |
| BoundMethodHandle.speciesData_L(), |
| BoundMethodHandle.speciesData_L().getterFunction(0)); |
| } |
| |
| private static LambdaForm makeDelegateFor(MethodType type) { |
| MethodHandle handle = MethodHandles.empty(type); |
| return DelegatingMethodHandle.makeReinvokerForm( |
| handle, |
| MethodTypeForm.LF_DELEGATE, |
| DelegatingMethodHandle.class, |
| DelegatingMethodHandle.NF_getTarget); |
| } |
| |
| static Map.Entry<String, byte[]> generateConcreteBMHClassBytes( |
| final String types) { |
| for (char c : types.toCharArray()) { |
| if ("LIJFD".indexOf(c) < 0) { |
| throw new IllegalArgumentException("All characters must " |
| + "correspond to a basic field type: LIJFD"); |
| } |
| } |
| String shortTypes = LambdaForm.shortenSignature(types); |
| final String className = |
| BoundMethodHandle.Factory.speciesInternalClassName(shortTypes); |
| return Map.entry(className, |
| BoundMethodHandle.Factory.generateConcreteBMHClassBytes( |
| shortTypes, types, className)); |
| } |
| |
| } |