J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1998-2004 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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 | } |