| /* |
| * 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); |
| } |
| |
| } |