Mercurial > hg > openjdk > jdk9 > langtools
view src/jdk.jshell/share/classes/jdk/jshell/execution/JdiExecutionControl.java @ 4136:1faee09b8da1
8179531: JShell: fails to provide bytecode for dynamically created lambdas
Summary: Adding support for getResource(s) to the JShell's ClassLoader
Reviewed-by: psandoz, rfield
author | jlahoda |
---|---|
date | Tue, 09 May 2017 12:22:15 +0200 |
parents | e7b7e4e436c4 |
children |
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/* * Copyright (c) 2014, 2017, 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 jdk.jshell.execution; import java.io.ObjectInput; import java.io.ObjectOutput; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.stream.Stream; import com.sun.jdi.ReferenceType; import com.sun.jdi.VirtualMachine; import jdk.jshell.spi.ExecutionControl; import static java.util.stream.Collectors.toMap; /** * Abstract JDI implementation of {@link jdk.jshell.spi.ExecutionControl}. * * @since 9 */ public abstract class JdiExecutionControl extends StreamingExecutionControl implements ExecutionControl { /** * Mapping from class names to JDI {@link ReferenceType}. */ private final Map<String, ReferenceType> toReferenceType = new HashMap<>(); /** * Create an instance. * @param out the output from the remote agent * @param in the input to the remote agent */ protected JdiExecutionControl(ObjectOutput out, ObjectInput in) { super(out, in); } /** * Returns the JDI {@link VirtualMachine} instance. * * @return the virtual machine * @throws EngineTerminationException if the VM is dead/disconnected */ protected abstract VirtualMachine vm() throws EngineTerminationException; /** * Redefine the specified classes. Where 'redefine' is, as in JDI and JVMTI, * an in-place replacement of the classes (preserving class identity) -- * that is, existing references to the class do not need to be recompiled. * This implementation uses JDI * {@link com.sun.jdi.VirtualMachine#redefineClasses(java.util.Map) }. * It will be unsuccessful if * the signature of the class has changed (see the JDI spec). The * JShell-core is designed to adapt to unsuccessful redefine. */ @Override public void redefine(ClassBytecodes[] cbcs) throws ClassInstallException, EngineTerminationException { try { // Convert to the JDI ReferenceType to class bytes map form needed // by JDI. VirtualMachine vm = vm(); Map<ReferenceType, byte[]> rmp = Stream.of(cbcs) .collect(toMap( cbc -> referenceType(vm, cbc.name()), cbc -> cbc.bytecodes())); // Attempt redefine. Throws exceptions on failure. vm().redefineClasses(rmp); } catch (EngineTerminationException ex) { throw ex; } catch (Exception ex) { throw new ClassInstallException("redefine: " + ex.getMessage(), new boolean[cbcs.length]); } // forward the redefine to remote-end to register the redefined bytecode try { super.redefine(cbcs); } catch (NotImplementedException ex) { // this remote doesn't care about registering bytecode, so we don't either } } /** * Returns the JDI {@link ReferenceType} corresponding to the specified * class name. * * @param vm the current JDI {@link VirtualMachine} as returned by * {@code vm()} * @param name the class name to look-up * @return the corresponding {@link ReferenceType} */ protected ReferenceType referenceType(VirtualMachine vm, String name) { return toReferenceType.computeIfAbsent(name, n -> nameToRef(vm, n)); } private static ReferenceType nameToRef(VirtualMachine vm, String name) { List<ReferenceType> rtl = vm.classesByName(name); if (rtl.size() != 1) { return null; } return rtl.get(0); } }