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| 1 | /* | ||
| 2 | * Copyright (c) 1998, 2004, 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.*; | ||
| 29 | |||
| 30 | import java.util.List; | ||
| 31 | import java.util.ArrayList; | ||
| 32 | import java.util.Arrays; | ||
| 33 | import java.util.Iterator; | ||
| 34 | |||
| 35 | public class ArrayReferenceImpl extends ObjectReferenceImpl | ||
| 36 | implements ArrayReference | ||
| 37 | { | ||
| 38 | int length = -1; | ||
| 39 | |||
| 40 | ArrayReferenceImpl(VirtualMachine aVm,long aRef) { | ||
| 41 | super(aVm,aRef); | ||
| 42 | } | ||
| 43 | |||
| 44 | protected ClassTypeImpl invokableReferenceType(Method method) { | ||
| 45 | // The method has to be a method on Object since | ||
| 46 | // arrays don't have methods nor any other 'superclasses' | ||
| 47 | // So, use the ClassTypeImpl for Object instead of | ||
| 48 | // the ArrayTypeImpl for the array itself. | ||
| 49 | return (ClassTypeImpl)method.declaringType(); | ||
| 50 | } | ||
| 51 | |||
| 52 | ArrayTypeImpl arrayType() { | ||
| 53 | return (ArrayTypeImpl)type(); | ||
| 54 | } | ||
| 55 | |||
| 56 | /** | ||
| 57 | * Return array length. | ||
| 58 | * Need not be synchronized since it cannot be provably stale. | ||
| 59 | */ | ||
| 60 | public int length() { | ||
| 61 | if(length == -1) { | ||
| 62 | try { | ||
| 63 | length = JDWP.ArrayReference.Length. | ||
| 64 | process(vm, this).arrayLength; | ||
| 65 | } catch (JDWPException exc) { | ||
| 66 | throw exc.toJDIException(); | ||
| 67 | } | ||
| 68 | } | ||
| 69 | return length; | ||
| 70 | } | ||
| 71 | |||
| 72 | public Value getValue(int index) { | ||
| 73 | List list = getValues(index, 1); | ||
| 74 | return (Value)list.get(0); | ||
| 75 | } | ||
| 76 | |||
| 77 | public List<Value> getValues() { | ||
| 78 | return getValues(0, -1); | ||
| 79 | } | ||
| 80 | |||
| 81 | /** | ||
| 82 | * Validate that the range to set/get is valid. | ||
| 83 | * length of -1 (meaning rest of array) has been converted | ||
| 84 | * before entry. | ||
| 85 | */ | ||
| 86 | private void validateArrayAccess(int index, int length) { | ||
| 87 | // because length can be computed from index, | ||
| 88 | // index must be tested first for correct error message | ||
| 89 | if ((index < 0) || (index > length())) { | ||
| 90 | throw new IndexOutOfBoundsException( | ||
| 91 | "Invalid array index: " + index); | ||
| 92 | } | ||
| 93 | if (length < 0) { | ||
| 94 | throw new IndexOutOfBoundsException( | ||
| 95 | "Invalid array range length: " + length); | ||
| 96 | } | ||
| 97 | if (index + length > length()) { | ||
| 98 | throw new IndexOutOfBoundsException( | ||
| 99 | "Invalid array range: " + | ||
| 100 | index + " to " + (index + length - 1)); | ||
| 101 | } | ||
| 102 | } | ||
| 103 | |||
| 104 | @SuppressWarnings("unchecked") | ||
| 105 | private static <T> T cast(Object x) { | ||
| 106 | return (T)x; | ||
| 107 | } | ||
| 108 | |||
| 109 | public List<Value> getValues(int index, int length) { | ||
| 110 | if (length == -1) { // -1 means the rest of the array | ||
| 111 | length = length() - index; | ||
| 112 | } | ||
| 113 | validateArrayAccess(index, length); | ||
| 114 | if (length == 0) { | ||
| 115 | return new ArrayList<Value>(); | ||
| 116 | } | ||
| 117 | |||
| 118 | List<Value> vals; | ||
| 119 | try { | ||
| 120 | vals = cast(JDWP.ArrayReference.GetValues.process(vm, this, index, length).values); | ||
| 121 | } catch (JDWPException exc) { | ||
| 122 | throw exc.toJDIException(); | ||
| 123 | } | ||
| 124 | |||
| 125 | return vals; | ||
| 126 | } | ||
| 127 | |||
| 128 | public void setValue(int index, Value value) | ||
| 129 | throws InvalidTypeException, | ||
| 130 | ClassNotLoadedException { | ||
| 131 | List<Value> list = new ArrayList<Value>(1); | ||
| 132 | list.add(value); | ||
| 133 | setValues(index, list, 0, 1); | ||
| 134 | } | ||
| 135 | |||
| 136 | public void setValues(List<? extends Value> values) | ||
| 137 | throws InvalidTypeException, | ||
| 138 | ClassNotLoadedException { | ||
| 139 | setValues(0, values, 0, -1); | ||
| 140 | } | ||
| 141 | |||
| 142 | public void setValues(int index, List<? extends Value> values, | ||
| 143 | int srcIndex, int length) | ||
| 144 | throws InvalidTypeException, | ||
| 145 | ClassNotLoadedException { | ||
| 146 | |||
| 147 | if (length == -1) { // -1 means the rest of the array | ||
| 148 | // shorter of, the rest of the array and rest of | ||
| 149 | // the source values | ||
| 150 | length = Math.min(length() - index, | ||
| 151 | values.size() - srcIndex); | ||
| 152 | } | ||
| 153 | validateMirrorsOrNulls(values); | ||
| 154 | validateArrayAccess(index, length); | ||
| 155 | |||
| 156 | if ((srcIndex < 0) || (srcIndex > values.size())) { | ||
| 157 | throw new IndexOutOfBoundsException( | ||
| 158 | "Invalid source index: " + srcIndex); | ||
| 159 | } | ||
| 160 | if (srcIndex + length > values.size()) { | ||
| 161 | throw new IndexOutOfBoundsException( | ||
| 162 | "Invalid source range: " + | ||
| 163 | srcIndex + " to " + | ||
| 164 | (srcIndex + length - 1)); | ||
| 165 | } | ||
| 166 | |||
| 167 | boolean somethingToSet = false;; | ||
| 168 | ValueImpl[] setValues = new ValueImpl[length]; | ||
| 169 | |||
| 170 | for (int i = 0; i < length; i++) { | ||
| 171 | ValueImpl value = (ValueImpl)values.get(srcIndex + i); | ||
| 172 | |||
| 173 | try { | ||
| 174 | // Validate and convert if necessary | ||
| 175 | setValues[i] = | ||
| 176 | ValueImpl.prepareForAssignment(value, | ||
| 177 | new Component()); | ||
| 178 | somethingToSet = true; | ||
| 179 | } catch (ClassNotLoadedException e) { | ||
| 180 | /* | ||
| 181 | * Since we got this exception, | ||
| 182 | * the component must be a reference type. | ||
| 183 | * This means the class has not yet been loaded | ||
| 184 | * through the defining class's class loader. | ||
| 185 | * If the value we're trying to set is null, | ||
| 186 | * then setting to null is essentially a | ||
| 187 | * no-op, and we should allow it without an | ||
| 188 | * exception. | ||
| 189 | */ | ||
| 190 | if (value != null) { | ||
| 191 | throw e; | ||
| 192 | } | ||
| 193 | } | ||
| 194 | } | ||
| 195 | if (somethingToSet) { | ||
| 196 | try { | ||
| 197 | JDWP.ArrayReference.SetValues. | ||
| 198 | process(vm, this, index, setValues); | ||
| 199 | } catch (JDWPException exc) { | ||
| 200 | throw exc.toJDIException(); | ||
| 201 | } | ||
| 202 | } | ||
| 203 | } | ||
| 204 | |||
| 205 | public String toString() { | ||
| 206 | return "instance of " + arrayType().componentTypeName() + | ||
| 207 | "[" + length() + "] (id=" + uniqueID() + ")"; | ||
| 208 | } | ||
| 209 | |||
| 210 | byte typeValueKey() { | ||
| 211 | return JDWP.Tag.ARRAY; | ||
| 212 | } | ||
| 213 | |||
| 214 | void validateAssignment(ValueContainer destination) | ||
| 215 | throws InvalidTypeException, ClassNotLoadedException { | ||
| 216 | try { | ||
| 217 | super.validateAssignment(destination); | ||
| 218 | } catch (ClassNotLoadedException e) { | ||
| 219 | /* | ||
| 220 | * An array can be used extensively without the | ||
| 221 | * enclosing loader being recorded by the VM as an | ||
| 222 | * initiating loader of the array type. In addition, the | ||
| 223 | * load of an array class is fairly harmless as long as | ||
| 224 | * the component class is already loaded. So we relax the | ||
| 225 | * rules a bit and allow the assignment as long as the | ||
| 226 | * ultimate component types are assignable. | ||
| 227 | */ | ||
| 228 | boolean valid = false; | ||
| 229 | JNITypeParser destParser = new JNITypeParser( | ||
| 230 | destination.signature()); | ||
| 231 | JNITypeParser srcParser = new JNITypeParser( | ||
| 232 | arrayType().signature()); | ||
| 233 | int destDims = destParser.dimensionCount(); | ||
| 234 | if (destDims <= srcParser.dimensionCount()) { | ||
| 235 | /* | ||
| 236 | * Remove all dimensions from the destination. Remove | ||
| 237 | * the same number of dimensions from the source. | ||
| 238 | * Get types for both and check to see if they are | ||
| 239 | * compatible. | ||
| 240 | */ | ||
| 241 | String destComponentSignature = | ||
| 242 | destParser.componentSignature(destDims); | ||
| 243 | Type destComponentType = | ||
| 244 | destination.findType(destComponentSignature); | ||
| 245 | String srcComponentSignature = | ||
| 246 | srcParser.componentSignature(destDims); | ||
| 247 | Type srcComponentType = | ||
| 248 | arrayType().findComponentType(srcComponentSignature); | ||
| 249 | valid = ArrayTypeImpl.isComponentAssignable(destComponentType, | ||
| 250 | srcComponentType); | ||
| 251 | } | ||
| 252 | |||
| 253 | if (!valid) { | ||
| 254 | throw new InvalidTypeException("Cannot assign " + | ||
| 255 | arrayType().name() + | ||
| 256 | " to " + | ||
| 257 | destination.typeName()); | ||
| 258 | } | ||
| 259 | } | ||
| 260 | } | ||
| 261 | |||
| 262 | /* | ||
| 263 | * Represents an array component to other internal parts of this | ||
| 264 | * implementation. This is not exposed at the JDI level. Currently, | ||
| 265 | * this class is needed only for type checking so it does not even | ||
| 266 | * reference a particular component - just a generic component | ||
| 267 | * of this array. In the future we may need to expand its use. | ||
| 268 | */ | ||
| 269 | class Component implements ValueContainer { | ||
| 270 | public Type type() throws ClassNotLoadedException { | ||
| 271 | return arrayType().componentType(); | ||
| 272 | } | ||
| 273 | public String typeName() { | ||
| 274 | return arrayType().componentTypeName(); | ||
| 275 | } | ||
| 276 | public String signature() { | ||
| 277 | return arrayType().componentSignature(); | ||
| 278 | } | ||
| 279 | public Type findType(String signature) throws ClassNotLoadedException { | ||
| 280 | return arrayType().findComponentType(signature); | ||
| 281 | } | ||
| 282 | } | ||
| 283 | } | ||