1 /* 2 * Copyright (c) 1998, 2017, 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 com.sun.tools.jdi; 27 28 import com.sun.jdi.ClassNotLoadedException; 29 import com.sun.jdi.InvalidTypeException; 30 import com.sun.jdi.Value; 31 import com.sun.jdi.VirtualMachine; 32 33 abstract class ValueImpl extends MirrorImpl implements Value { 34 35 ValueImpl(VirtualMachine aVm) { 36 super(aVm); 37 } 38 39 static ValueImpl prepareForAssignment(Value value, 40 ValueContainer destination) 41 throws InvalidTypeException, ClassNotLoadedException { 42 if (value == null) { 43 /* 44 * TO DO: Centralize JNI signature knowledge 45 */ 46 if (destination.signature().length() == 1) { 47 throw new InvalidTypeException("Can't set a primitive type to null"); 48 } 49 if (destination.signature().charAt(0) == 'Q') { 50 throw new InvalidTypeException("Can't set an inline type to null"); 51 } 52 return null; // no further checking or conversion necessary 53 } else { 54 return ((ValueImpl)value).prepareForAssignmentTo(destination); 55 } 56 } 57 58 static byte typeValueKey(Value val) { 59 if (val == null) { 60 return JDWP.Tag.OBJECT; 61 } else { 62 return ((ValueImpl)val).typeValueKey(); 63 } 64 } 65 66 abstract ValueImpl prepareForAssignmentTo(ValueContainer destination) 67 throws InvalidTypeException, ClassNotLoadedException; 68 69 abstract byte typeValueKey(); 70 }