| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.iapi.services.classfile.ClassHolder |
| 4 | |
| 5 | Copyright 2000, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.iapi.services.classfile; |
| 22 | |
| 23 | import org.apache.derby.iapi.services.sanity.SanityManager; |
| 24 | |
| 25 | |
| 26 | import java.io.InputStream; |
| 27 | import java.io.OutputStream; |
| 28 | import java.util.Enumeration; |
| 29 | |
| 30 | import java.io.IOException; |
| 31 | import java.util.Vector; |
| 32 | |
| 33 | import org.apache.derby.iapi.util.ByteArray; |
| 34 | import org.apache.derby.iapi.services.classfile.VMDescriptor; |
| 35 | import org.apache.derby.iapi.services.classfile.VMDescriptor; |
| 36 | |
| 37 | import java.util.Hashtable; |
| 38 | import java.util.Vector; |
| 39 | import java.util.Enumeration; |
| 40 | |
| 41 | |
| 42 | /** Based upon "THE class FILE FORMAT" chapter of "The Java Virtual Machine Specification" |
| 43 | corresponding to version 1.0.2 of the Java Virtual Machine and 1.0.2 of the |
| 44 | Java Language Specification. |
| 45 | |
| 46 | ISBN 0-201-63452-X, September 1996. |
| 47 | */ |
| 48 | |
| 49 | public class ClassHolder { |
| 50 | |
| 51 | |
| 52 | /* |
| 53 | ** Constants. |
| 54 | */ |
| 55 | |
| 56 | /* |
| 57 | ** Fields |
| 58 | */ |
| 59 | |
| 60 | protected int access_flags; |
| 61 | protected int this_class; |
| 62 | protected int super_class; |
| 63 | |
| 64 | // protected InterfacesArray interfaces; // can be null |
| 65 | protected int[] interfaces; //can be null |
| 66 | |
| 67 | protected MemberTable field_info; // can be null |
| 68 | protected MemberTable method_info; // can be null |
| 69 | protected Attributes attribute_info; // can be null |
| 70 | |
| 71 | /* |
| 72 | ** Fields for Constant Pool Table |
| 73 | */ |
| 74 | protected Hashtable cptHashTable; |
| 75 | protected Vector cptEntries; |
| 76 | private int cptEstimatedSize; |
| 77 | |
| 78 | /** |
| 79 | Used to search for index entries to avoid object allocation |
| 80 | in the case a referecne already exists. |
| 81 | */ |
| 82 | private final CONSTANT_Index_info searchIndex = new CONSTANT_Index_info(0, 0, 0); |
| 83 | |
| 84 | /* |
| 85 | ** Constructors. |
| 86 | */ |
| 87 | |
| 88 | protected ClassHolder(int estimatedConstantPoolCount) { |
| 89 | // Constant Pool Information |
| 90 | // 100 is the estimate of the number of entries that will be generated |
| 91 | cptEntries = new Vector(estimatedConstantPoolCount); |
| 92 | cptHashTable = new Hashtable(estimatedConstantPoolCount, (float)0.75); |
| 93 | |
| 94 | // reserve the 0'th constant pool entry |
| 95 | cptEntries.setSize(1); |
| 96 | } |
| 97 | |
| 98 | |
| 99 | /** |
| 100 | This will not define a constructor -- it is up |
| 101 | to the caller to add at least one. |
| 102 | */ |
| 103 | |
| 104 | public ClassHolder(String fullyQualifiedName, String superClassName, |
| 105 | int modifiers) { |
| 106 | |
| 107 | this(100); |
| 108 | |
| 109 | access_flags = modifiers | /* Modifier.SUPER */ 0x0020; |
| 110 | |
| 111 | this_class = addClassReference(fullyQualifiedName); |
| 112 | super_class = addClassReference(superClassName); |
| 113 | method_info = new MemberTable(0); |
| 114 | } |
| 115 | |
| 116 | private void put(ClassFormatOutput out) throws IOException { |
| 117 | |
| 118 | /* Write out the header */ |
| 119 | out.putU4(VMDescriptor.JAVA_CLASS_FORMAT_MAGIC); |
| 120 | out.putU2(VMDescriptor.JAVA_CLASS_FORMAT_MINOR_VERSION); |
| 121 | out.putU2(VMDescriptor.JAVA_CLASS_FORMAT_MAJOR_VERSION); |
| 122 | |
| 123 | // special case checking that the number of constant |
| 124 | // pool entries does not exceed the limit of 65535 |
| 125 | // (as it is stored as a U2). |
| 126 | // Special case to allow somewhat easier debugging |
| 127 | // of the resulting failure. |
| 128 | out.putU2("constant_pool", cptEntries.size()); |
| 129 | cptPut(out); |
| 130 | |
| 131 | out.putU2(access_flags); |
| 132 | out.putU2(this_class); |
| 133 | out.putU2(super_class); |
| 134 | |
| 135 | if (interfaces != null) { |
| 136 | int ilen = interfaces.length; |
| 137 | out.putU2(ilen); |
| 138 | for (int i = 0; i < ilen; i++) { |
| 139 | out.putU2(interfaces[i]); |
| 140 | } |
| 141 | } else { |
| 142 | out.putU2(0); |
| 143 | } |
| 144 | |
| 145 | if (field_info != null) { |
| 146 | out.putU2(field_info.size()); |
| 147 | field_info.put(out); |
| 148 | } else { |
| 149 | out.putU2(0); |
| 150 | } |
| 151 | |
| 152 | if (method_info != null) { |
| 153 | out.putU2(method_info.size()); |
| 154 | method_info.put(out); |
| 155 | } else { |
| 156 | out.putU2(0); |
| 157 | } |
| 158 | |
| 159 | if (attribute_info != null) { |
| 160 | out.putU2(attribute_info.size()); |
| 161 | attribute_info.put(out); |
| 162 | } else { |
| 163 | out.putU2(0); |
| 164 | } |
| 165 | |
| 166 | } |
| 167 | |
| 168 | |
| 169 | /* |
| 170 | ** Public methods from ClassHolder. |
| 171 | */ |
| 172 | |
| 173 | /** |
| 174 | * Convert the object representation of the class into |
| 175 | * its class file format. |
| 176 | * @exception IOException error writing the class |
| 177 | */ |
| 178 | public ByteArray getFileFormat() throws IOException { |
| 179 | |
| 180 | int classFileSize = 4 + (10 * 2); |
| 181 | classFileSize += cptEstimatedSize; |
| 182 | |
| 183 | if (interfaces != null) |
| 184 | classFileSize += (interfaces.length * 2); |
| 185 | |
| 186 | if (field_info != null) |
| 187 | classFileSize += field_info.classFileSize(); |
| 188 | |
| 189 | if (method_info != null) |
| 190 | classFileSize += method_info.classFileSize(); |
| 191 | |
| 192 | if (attribute_info != null) |
| 193 | classFileSize += attribute_info.classFileSize(); |
| 194 | |
| 195 | |
| 196 | ClassFormatOutput cfo = new ClassFormatOutput(classFileSize + 200); |
| 197 | |
| 198 | put(cfo); |
| 199 | |
| 200 | return new ByteArray(cfo.getData(), 0, cfo.size()); |
| 201 | |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | ** Public methods from ClassMember |
| 206 | */ |
| 207 | |
| 208 | /** @see ClassMember |
| 209 | */ |
| 210 | public int getModifier() { return access_flags; } |
| 211 | |
| 212 | /** @see ClassMember |
| 213 | */ |
| 214 | public String getName() { |
| 215 | return className(this_class).replace('/', '.'); |
| 216 | } |
| 217 | /* |
| 218 | ** Public methods from ClassHolder |
| 219 | */ |
| 220 | |
| 221 | /** @see ClassHolder#addMember */ |
| 222 | public ClassMember addMember(String simpleName, String descriptor, int modifier) |
| 223 | { |
| 224 | if (SanityManager.DEBUG) |
| 225 | { |
| 226 | if (descriptor.startsWith("(")) { |
| 227 | if (method_info != null) { |
| 228 | if (method_info.find(simpleName, descriptor) != null) { |
| 229 | SanityManager.THROWASSERT("Method already exists " + simpleName + " " + descriptor); |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | } else { |
| 234 | if (field_info != null) { |
| 235 | if (field_info.find(simpleName, descriptor) != null) { |
| 236 | SanityManager.THROWASSERT("Field already exists " + simpleName + " " + descriptor); |
| 237 | } |
| 238 | } |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | CONSTANT_Utf8_info utf = addUtf8Entry(simpleName); |
| 243 | |
| 244 | int nameIndex = utf.getIndex(); |
| 245 | int descriptorIndex = addUtf8Entry(descriptor).getIndex(); |
| 246 | |
| 247 | ClassMember item = new ClassMember(this, modifier, nameIndex, descriptorIndex); |
| 248 | MemberTable mt; |
| 249 | if (descriptor.startsWith("(")) { |
| 250 | mt = method_info; |
| 251 | if (mt == null) |
| 252 | mt = method_info = new MemberTable(0); |
| 253 | |
| 254 | } |
| 255 | else { |
| 256 | mt = field_info; |
| 257 | if (mt == null) |
| 258 | mt = field_info = new MemberTable(0); |
| 259 | } |
| 260 | |
| 261 | mt.addEntry(item); |
| 262 | return item; |
| 263 | } |
| 264 | |
| 265 | /** @see ClassHolder#addFieldReference */ |
| 266 | public int addFieldReference(String className, String simpleName, String descriptor) { |
| 267 | return addReference(VMDescriptor.CONSTANT_Fieldref, className, simpleName, descriptor); |
| 268 | } |
| 269 | |
| 270 | public int addFieldReference(ClassMember field) { |
| 271 | return addReference(VMDescriptor.CONSTANT_Fieldref, (ClassMember) field); |
| 272 | } |
| 273 | |
| 274 | /** @see ClassHolder#addMethodReference */ |
| 275 | public int addMethodReference(String className, String simpleName, String descriptor, boolean isInterface) { |
| 276 | |
| 277 | int tag = isInterface ? VMDescriptor.CONSTANT_InterfaceMethodref : |
| 278 | VMDescriptor.CONSTANT_Methodref; |
| 279 | |
| 280 | return addReference(tag, className, simpleName, descriptor); |
| 281 | } |
| 282 | |
| 283 | private int addReference(int tag, String className, String simpleName, String descriptor) { |
| 284 | |
| 285 | int classIndex = addClassReference(className); |
| 286 | int nameTypeIndex = addNameAndType(simpleName, descriptor); |
| 287 | |
| 288 | return addIndexReference(tag, classIndex, nameTypeIndex); |
| 289 | } |
| 290 | |
| 291 | private int addReference(int tag, ClassMember member) { |
| 292 | |
| 293 | int nameTypeIndex = addIndexReference(VMDescriptor.CONSTANT_NameAndType, |
| 294 | member.name_index, member.descriptor_index); |
| 295 | |
| 296 | return addIndexReference(tag, this_class, nameTypeIndex); |
| 297 | } |
| 298 | |
| 299 | /** @see ClassHolder#addConstant */ |
| 300 | public int addConstant(String value) { |
| 301 | |
| 302 | return addString(value); |
| 303 | } |
| 304 | |
| 305 | /** @see ClassHolder#addUtf8 */ |
| 306 | public int addUtf8(String value) { |
| 307 | |
| 308 | return addUtf8Entry(value).getIndex(); |
| 309 | } |
| 310 | |
| 311 | |
| 312 | /** @see ClassHolder#addConstant */ |
| 313 | public int addConstant(int value) { |
| 314 | return addDirectEntry(new CONSTANT_Integer_info(value)); |
| 315 | } |
| 316 | |
| 317 | /** @see ClassHolder#addConstant */ |
| 318 | public int addConstant(float value) { |
| 319 | return addDirectEntry(new CONSTANT_Float_info(value)); |
| 320 | } |
| 321 | |
| 322 | /** @see ClassHolder#addConstant */ |
| 323 | public int addConstant(long value) { |
| 324 | return addDirectEntry(new CONSTANT_Long_info(value)); |
| 325 | } |
| 326 | |
| 327 | /** @see ClassHolder#addConstant */ |
| 328 | public int addConstant(double value) { |
| 329 | return addDirectEntry(new CONSTANT_Double_info(value)); |
| 330 | } |
| 331 | |
| 332 | |
| 333 | /** @see ClassMember |
| 334 | */ |
| 335 | public int getConstantPoolIndex() { return this_class; } |
| 336 | |
| 337 | public void addAttribute(String attributeName, ClassFormatOutput info) { |
| 338 | |
| 339 | if (attribute_info == null) |
| 340 | attribute_info = new Attributes(1); |
| 341 | |
| 342 | |
| 343 | CONSTANT_Utf8_info autf = addUtf8Entry(attributeName); |
| 344 | |
| 345 | int index = autf.getIndex(); |
| 346 | |
| 347 | attribute_info.addEntry(new AttributeEntry(index, info)); |
| 348 | } |
| 349 | |
| 350 | |
| 351 | public String getSuperClassName() { |
| 352 | if (super_class == 0) |
| 353 | return null; |
| 354 | else |
| 355 | return className(super_class).replace('/', '.'); |
| 356 | } |
| 357 | |
| 358 | |
| 359 | /* |
| 360 | public ClassMember getMemberReference(String fullyQualifiedClassName, String simpleName, String descriptor) { |
| 361 | |
| 362 | int classIndex; |
| 363 | |
| 364 | if (fullyQualifiedClassName == null) |
| 365 | classIndex = this_class; |
| 366 | else |
| 367 | classIndex = constantPool.findClass(fullyQualifiedClassName); |
| 368 | |
| 369 | if (classIndex < 0) |
| 370 | return null; |
| 371 | |
| 372 | int nameAndTypeIndex = constantPool.findNameAndType(simpleName, descriptor); |
| 373 | if (nameAndTypeIndex < 0) |
| 374 | return null; |
| 375 | |
| 376 | return constantPool.findReference(classIndex, nameAndTypeIndex); |
| 377 | } |
| 378 | */ |
| 379 | /* |
| 380 | ** Public methods from ClassRead |
| 381 | */ |
| 382 | |
| 383 | |
| 384 | |
| 385 | /* |
| 386 | ** Implementation specific methods. |
| 387 | */ |
| 388 | |
| 389 | /* |
| 390 | ** Methods related to Constant Pool Table |
| 391 | */ |
| 392 | /** |
| 393 | Generic add entry to constant pool. Includes the logic |
| 394 | for an entry to occupy more than one slot (e.g. long). |
| 395 | |
| 396 | @return The number of slots occupied by the entry. |
| 397 | . |
| 398 | */ |
| 399 | protected int addEntry(Object key, ConstantPoolEntry item) { |
| 400 | |
| 401 | item.setIndex(cptEntries.size()); |
| 402 | if (key != null) |
| 403 | cptHashTable.put(key, item); |
| 404 | cptEntries.addElement(item); |
| 405 | |
| 406 | cptEstimatedSize += item.classFileSize(); |
| 407 | |
| 408 | if (item.doubleSlot()) { |
| 409 | cptEntries.addElement(null); |
| 410 | return 2; |
| 411 | } else { |
| 412 | return 1; |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | /** |
| 417 | Add an entry, but only if it doesn't exist. |
| 418 | |
| 419 | @return the constant pool index of the added |
| 420 | or existing item. |
| 421 | */ |
| 422 | private int addDirectEntry(ConstantPoolEntry item) { |
| 423 | ConstantPoolEntry existingItem = findMatchingEntry(item); |
| 424 | if (existingItem != null) { |
| 425 | item = existingItem; |
| 426 | //foundCount++; |
| 427 | } |
| 428 | else { |
| 429 | addEntry(item.getKey(), item); |
| 430 | } |
| 431 | return item.getIndex(); |
| 432 | } |
| 433 | |
| 434 | /** |
| 435 | Add an index reference. |
| 436 | */ |
| 437 | private int addIndexReference(int tag, int i1, int i2) { |
| 438 | |
| 439 | // search for the item using the pre-allocated object |
| 440 | searchIndex.set(tag, i1, i2); |
| 441 | |
| 442 | ConstantPoolEntry item = findMatchingEntry(searchIndex); |
| 443 | |
| 444 | if (item == null) { |
| 445 | item = new CONSTANT_Index_info(tag, i1, i2); |
| 446 | addEntry(item.getKey(), item); |
| 447 | } |
| 448 | |
| 449 | return item.getIndex(); |
| 450 | } |
| 451 | |
| 452 | /** |
| 453 | Add a class entry to the pool. |
| 454 | */ |
| 455 | public int addClassReference(String fullyQualifiedName) { |
| 456 | if (ClassHolder.isExternalClassName(fullyQualifiedName)) { |
| 457 | fullyQualifiedName = ClassHolder.convertToInternalClassName(fullyQualifiedName); |
| 458 | // System.out.println("addClassReference " + fullyQualifiedName); |
| 459 | } |
| 460 | |
| 461 | int name_index = addUtf8Entry(fullyQualifiedName).getIndex(); |
| 462 | |
| 463 | return addIndexReference(VMDescriptor.CONSTANT_Class, name_index, 0); |
| 464 | } |
| 465 | |
| 466 | /** |
| 467 | Add a name and type entry |
| 468 | */ |
| 469 | private int addNameAndType(String name, String descriptor) { |
| 470 | int nameIndex = addUtf8Entry(name).getIndex(); |
| 471 | |
| 472 | int descriptorIndex = addUtf8Entry(descriptor).getIndex(); |
| 473 | |
| 474 | return addIndexReference(VMDescriptor.CONSTANT_NameAndType, nameIndex, descriptorIndex); |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | Add a UTF8 into the pool and return the index to it. |
| 479 | */ |
| 480 | private CONSTANT_Utf8_info addUtf8Entry(String value) { |
| 481 | |
| 482 | CONSTANT_Utf8_info item = (CONSTANT_Utf8_info) findMatchingEntry(value); |
| 483 | |
| 484 | if (item == null) { |
| 485 | |
| 486 | item = new CONSTANT_Utf8_info(value); |
| 487 | addEntry(value, item); |
| 488 | } |
| 489 | return item; |
| 490 | } |
| 491 | /** |
| 492 | Add an extra UTF8 into the pool |
| 493 | */ |
| 494 | private CONSTANT_Utf8_info addExtraUtf8(String value) { |
| 495 | |
| 496 | CONSTANT_Utf8_info item = new CONSTANT_Utf8_info(value); |
| 497 | addEntry(null, item); |
| 498 | |
| 499 | return item; |
| 500 | } |
| 501 | |
| 502 | /** |
| 503 | Add a string entry |
| 504 | */ |
| 505 | private int addString(String value) { |
| 506 | CONSTANT_Utf8_info sutf = addUtf8Entry(value); |
| 507 | int valueIndex = sutf.setAsString(); |
| 508 | if (valueIndex == 0) { |
| 509 | // string is already being used as code |
| 510 | valueIndex = addExtraUtf8(value).getIndex(); |
| 511 | sutf.setAlternative(valueIndex); |
| 512 | } |
| 513 | |
| 514 | return addIndexReference(VMDescriptor.CONSTANT_String, valueIndex, 0); |
| 515 | } |
| 516 | |
| 517 | /** |
| 518 | Add a string entry |
| 519 | */ |
| 520 | private int addCodeUtf8(String value) { |
| 521 | CONSTANT_Utf8_info sutf = addUtf8Entry(value); |
| 522 | int index = sutf.setAsCode(); |
| 523 | if (index == 0) { |
| 524 | // code string is already being used as string |
| 525 | CONSTANT_Utf8_info eutf = addExtraUtf8(value); |
| 526 | eutf.setAsCode(); // ensure the replace will happen |
| 527 | index = eutf.getIndex(); |
| 528 | sutf.setAlternative(index); |
| 529 | } |
| 530 | |
| 531 | return index; |
| 532 | } |
| 533 | protected void cptPut(ClassFormatOutput out) throws IOException { |
| 534 | |
| 535 | for (Enumeration e = cptEntries.elements(); e.hasMoreElements(); ) { |
| 536 | ConstantPoolEntry item = (ConstantPoolEntry) e.nextElement(); |
| 537 | if (item == null) { |
| 538 | continue; |
| 539 | } |
| 540 | |
| 541 | item.put(out); |
| 542 | } |
| 543 | } |
| 544 | |
| 545 | /* |
| 546 | ** Methods to convert indexes to constant pool entries and vice-versa. |
| 547 | */ |
| 548 | |
| 549 | public ConstantPoolEntry getEntry(int index) { |
| 550 | return (ConstantPoolEntry) cptEntries.elementAt(index); |
| 551 | } |
| 552 | |
| 553 | /** |
| 554 | Return the class name for an index to a CONSTANT_Class_info. |
| 555 | */ |
| 556 | |
| 557 | protected String className(int classIndex) { |
| 558 | CONSTANT_Index_info ci = (CONSTANT_Index_info) getEntry(classIndex); |
| 559 | |
| 560 | return nameIndexToString(ci.getI1()).replace('/', '.'); |
| 561 | |
| 562 | } |
| 563 | |
| 564 | /* |
| 565 | ** Methods to find specific types of constant pool entries. |
| 566 | In these methods we try to avoid using the ConstantPoolEntry.matchValue() |
| 567 | as that requires creating a new object for the search. The matchValue() |
| 568 | call is really intended for when objects are being added to the constant pool. |
| 569 | */ |
| 570 | |
| 571 | /** |
| 572 | Return the index of a UTF entry or -1 if it doesn't exist. |
| 573 | */ |
| 574 | int findUtf8(String value) { |
| 575 | |
| 576 | ConstantPoolEntry item = findMatchingEntry(value); |
| 577 | if (item == null) |
| 578 | return -1; |
| 579 | |
| 580 | return item.getIndex(); |
| 581 | } |
| 582 | |
| 583 | /** |
| 584 | Find a class descriptor (section 4.4.1) and return its |
| 585 | index, returns -1 if not found. |
| 586 | */ |
| 587 | public int findClass(String fullyQualifiedName) { |
| 588 | String internalName = ClassHolder.convertToInternalClassName(fullyQualifiedName); |
| 589 | int utf_index = findUtf8(internalName); |
| 590 | if (utf_index < 0) |
| 591 | return -1; |
| 592 | |
| 593 | return findIndexIndex(VMDescriptor.CONSTANT_Class, |
| 594 | utf_index, 0); |
| 595 | } |
| 596 | |
| 597 | |
| 598 | /** |
| 599 | Find a name and type descriptor (section 4.4.6) and |
| 600 | return it's index. |
| 601 | <p> |
| 602 | returns -1 if not found. |
| 603 | */ |
| 604 | public int findNameAndType(String name, String descriptor) { |
| 605 | |
| 606 | int name_index = findUtf8(name); |
| 607 | if (name_index < 0) |
| 608 | return -1; |
| 609 | int descriptor_index = findUtf8(descriptor); |
| 610 | if (descriptor_index < 0) |
| 611 | return -1; |
| 612 | |
| 613 | return findIndexIndex(VMDescriptor.CONSTANT_NameAndType, |
| 614 | name_index, descriptor_index); |
| 615 | } |
| 616 | /* |
| 617 | public ClassMember findReference(int classIndex, int nameAndTypeIndex) { |
| 618 | |
| 619 | CONSTANT_Index_info item = findIndexEntry(VMDescriptor.CONSTANT_Methodref, |
| 620 | classIndex, nameAndTypeIndex); |
| 621 | |
| 622 | if (item == null) { |
| 623 | |
| 624 | item = findIndexEntry(VMDescriptor.CONSTANT_InterfaceMethodref, |
| 625 | classIndex, nameAndTypeIndex); |
| 626 | |
| 627 | if (item == null) { |
| 628 | item = findIndexEntry(VMDescriptor.CONSTANT_Fieldref, |
| 629 | classIndex, nameAndTypeIndex); |
| 630 | |
| 631 | if (item == null) |
| 632 | return null; |
| 633 | |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | return new ReferenceMember(this, item); |
| 638 | } |
| 639 | */ |
| 640 | protected CONSTANT_Index_info findIndexEntry(int tag, int i1, int i2) { |
| 641 | // search for the item using the pre-allocated object |
| 642 | searchIndex.set(tag, i1, i2); |
| 643 | |
| 644 | return (CONSTANT_Index_info) findMatchingEntry(searchIndex); |
| 645 | } |
| 646 | |
| 647 | protected int findIndexIndex(int tag, int i1, int i2) { |
| 648 | CONSTANT_Index_info item = findIndexEntry(tag, i1, i2); |
| 649 | if (item == null) |
| 650 | return -1; |
| 651 | |
| 652 | return item.getIndex(); |
| 653 | } |
| 654 | |
| 655 | protected ConstantPoolEntry findMatchingEntry(Object key) { |
| 656 | return (ConstantPoolEntry) cptHashTable.get(key); |
| 657 | } |
| 658 | |
| 659 | /** get a string (UTF) given a name_index into the constant pool |
| 660 | */ |
| 661 | String nameIndexToString(int index) { |
| 662 | |
| 663 | return getEntry(index).toString(); |
| 664 | } |
| 665 | |
| 666 | /** get the class name of a Class given the index of its CONSTANT_Class_info |
| 667 | entry in the Constant Pool. |
| 668 | */ |
| 669 | |
| 670 | protected String getClassName(int index) { |
| 671 | |
| 672 | if (index == 0) |
| 673 | return ""; // must be the super class of java.lang.Object, ie. nothing. |
| 674 | |
| 675 | return nameIndexToString(getEntry(index).getI1()); |
| 676 | } |
| 677 | |
| 678 | /* |
| 679 | * Determine whether the class descriptor string is |
| 680 | * in external format or not. Assumes that to be in external |
| 681 | * format means it must have a '.' or end in an ']'. |
| 682 | * |
| 683 | * @param className the name of the class to check |
| 684 | * |
| 685 | * @return true/false |
| 686 | */ |
| 687 | public static boolean isExternalClassName(String className) |
| 688 | { |
| 689 | int len; |
| 690 | if (className.indexOf('.') != -1) |
| 691 | { |
| 692 | return true; |
| 693 | } |
| 694 | else if ((len = className.length()) == 0) |
| 695 | { |
| 696 | return false; |
| 697 | } |
| 698 | return (className.charAt(len - 1) == ']'); |
| 699 | } |
| 700 | |
| 701 | /* |
| 702 | * Convert a class name to the internal VM class name format. |
| 703 | See sections 4.3.2, 4.4.1 of the vm spec. |
| 704 | * The normal leading 'L' and trailing ';' are left |
| 705 | * off of objects. This is intended primarily for |
| 706 | * the class manager. |
| 707 | * <p> |
| 708 | * An example of a conversion would be java.lang.Double[] |
| 709 | * to "[Ljava/lang/Double;". |
| 710 | <BR> |
| 711 | java.lang.Double would be converted to "java/lang/Double" |
| 712 | |
| 713 | <BR> |
| 714 | Note that for array types the result of convertToInternalClassName() |
| 715 | and convertToInternalDescriptor() are identical. |
| 716 | |
| 717 | * |
| 718 | * @param the external name (cannot be null) |
| 719 | * |
| 720 | * @return the internal string |
| 721 | */ |
| 722 | public static String convertToInternalClassName(String externalName) |
| 723 | { |
| 724 | return convertToInternal(externalName, false); |
| 725 | } |
| 726 | |
| 727 | /* |
| 728 | * Convert a class name to internal JVM descriptor format. |
| 729 | See sections 4.3.2 of the vm spec. |
| 730 | * <p> |
| 731 | * An example of a conversion would be "java.lang.Double[]" |
| 732 | * to "[Ljava/lang/Double;". |
| 733 | * |
| 734 | <BR> |
| 735 | java.lang.Double would be converted to "Ljava/lang/Double;" |
| 736 | |
| 737 | <BR> |
| 738 | Note that for array types the result of convertToInternalClassName() |
| 739 | and convertToInternalDescriptor() are identical. |
| 740 | |
| 741 | * @param the external name (cannot be null) |
| 742 | * |
| 743 | * @return the internal string |
| 744 | */ |
| 745 | public static String convertToInternalDescriptor(String externalName) |
| 746 | { |
| 747 | return convertToInternal(externalName, true); |
| 748 | } |
| 749 | |
| 750 | /* |
| 751 | ** Workhorse method. Convert to internal format. |
| 752 | |
| 753 | @param descriptor True if converting to descriptor format, false if |
| 754 | converting to class name format. |
| 755 | ** |
| 756 | ** Lifted from BCClass.java. |
| 757 | ** |
| 758 | ** Returns the result string. |
| 759 | */ |
| 760 | private static String convertToInternal(String externalName, boolean descriptor) |
| 761 | { |
| 762 | if (SanityManager.DEBUG) |
| 763 | { |
| 764 | SanityManager.ASSERT(externalName != null, "unexpected null"); |
| 765 | } |
| 766 | |
| 767 | int len = externalName.length(); |
| 768 | |
| 769 | String internalName; |
| 770 | String retVal = null; |
| 771 | int origLen = len; |
| 772 | int arity = 0; |
| 773 | |
| 774 | // first walk through all array-ness |
| 775 | if (externalName.charAt(len-1) == ']') |
| 776 | { |
| 777 | while (len > 0 |
| 778 | && externalName.charAt(len-1) == ']' |
| 779 | && externalName.charAt(len-2) == '[') |
| 780 | { |
| 781 | len -= 2; |
| 782 | arity++; |
| 783 | } |
| 784 | } |
| 785 | if (SanityManager.DEBUG) { |
| 786 | SanityManager.ASSERT(len > 0); |
| 787 | } |
| 788 | |
| 789 | internalName = (origLen == len)? |
| 790 | externalName |
| 791 | : externalName.substring(0,len); |
| 792 | |
| 793 | // then check for primitive types ... |
| 794 | // in length by expected frequency order |
| 795 | |
| 796 | switch (len) { |
| 797 | case 7 : |
| 798 | if ("boolean".equals(internalName)) { |
| 799 | retVal = makeDesc(VMDescriptor.C_BOOLEAN, arity); |
| 800 | } |
| 801 | break; |
| 802 | case 4 : |
| 803 | if ("void".equals(internalName)) { |
| 804 | retVal = makeDesc(VMDescriptor.C_VOID, arity); |
| 805 | } |
| 806 | else if ("long".equals(internalName)) { |
| 807 | retVal = makeDesc(VMDescriptor.C_LONG, arity); |
| 808 | } |
| 809 | else if ("byte".equals(internalName)) { |
| 810 | retVal = makeDesc(VMDescriptor.C_BYTE, arity); |
| 811 | } |
| 812 | else if ("char".equals(internalName)) { |
| 813 | retVal = makeDesc(VMDescriptor.C_CHAR, arity); |
| 814 | } |
| 815 | break; |
| 816 | case 3 : |
| 817 | if ("int".equals(internalName)) { |
| 818 | retVal = makeDesc(VMDescriptor.C_INT, arity); |
| 819 | } |
| 820 | break; |
| 821 | case 6 : |
| 822 | if ("double".equals(internalName)) { |
| 823 | retVal = makeDesc(VMDescriptor.C_DOUBLE, arity); |
| 824 | } |
| 825 | break; |
| 826 | case 5 : |
| 827 | if ("short".equals(internalName)) { |
| 828 | retVal = makeDesc(VMDescriptor.C_SHORT, arity); |
| 829 | } |
| 830 | else if ("float".equals(internalName)) { |
| 831 | retVal = makeDesc(VMDescriptor.C_FLOAT, arity); |
| 832 | } |
| 833 | break; |
| 834 | } |
| 835 | |
| 836 | // then it must be a Java class |
| 837 | if (retVal == null) |
| 838 | retVal = makeDesc(internalName, arity, descriptor); |
| 839 | |
| 840 | return retVal; |
| 841 | } |
| 842 | |
| 843 | /** |
| 844 | A helper to build a type description based on a built-in type |
| 845 | and an array arity. |
| 846 | */ |
| 847 | static private String makeDesc (char builtin, int arity) { |
| 848 | if (arity == 0) |
| 849 | switch (builtin) { |
| 850 | case VMDescriptor.C_BYTE : return VMDescriptor.BYTE; |
| 851 | case VMDescriptor.C_CHAR : return VMDescriptor.CHAR; |
| 852 | case VMDescriptor.C_DOUBLE : return VMDescriptor.DOUBLE; |
| 853 | case VMDescriptor.C_FLOAT : return VMDescriptor.FLOAT; |
| 854 | case VMDescriptor.C_INT : return VMDescriptor.INT; |
| 855 | case VMDescriptor.C_LONG : return VMDescriptor.LONG; |
| 856 | case VMDescriptor.C_SHORT : return VMDescriptor.SHORT; |
| 857 | case VMDescriptor.C_BOOLEAN : return VMDescriptor.BOOLEAN; |
| 858 | case VMDescriptor.C_VOID : return VMDescriptor.VOID; |
| 859 | default: |
| 860 | if (SanityManager.DEBUG) |
| 861 | SanityManager.THROWASSERT("No type match"); |
| 862 | return null; |
| 863 | } |
| 864 | else { |
| 865 | StringBuffer desc = new StringBuffer(arity+3); |
| 866 | |
| 867 | for (int i=0;i<arity;i++) |
| 868 | desc.append(VMDescriptor.C_ARRAY); |
| 869 | |
| 870 | desc.append(ClassHolder.makeDesc(builtin, 0)); |
| 871 | |
| 872 | return desc.toString(); |
| 873 | } |
| 874 | } |
| 875 | |
| 876 | /** |
| 877 | A helper to build a type description based on a Java class |
| 878 | and an array arity. |
| 879 | |
| 880 | If descriptor is true create a descriptor according to |
| 881 | section 4.3.2 of the vm spec. If false create a class name |
| 882 | according to sections 4.3.2 and 4.4.1 of the vm spec. |
| 883 | |
| 884 | */ |
| 885 | static private String makeDesc (String className, int arity, boolean descriptor) { |
| 886 | |
| 887 | if (!descriptor && (arity == 0)) { |
| 888 | return className.replace('.','/'); |
| 889 | } |
| 890 | |
| 891 | StringBuffer desc = new StringBuffer(arity+2+className.length()); |
| 892 | |
| 893 | for (int i=0;i<arity;i++) |
| 894 | desc.append(VMDescriptor.C_ARRAY); |
| 895 | |
| 896 | desc.append(VMDescriptor.C_CLASS); |
| 897 | |
| 898 | desc.append(className.replace('.','/')); |
| 899 | |
| 900 | desc.append(VMDescriptor.C_ENDCLASS); |
| 901 | |
| 902 | return desc.toString(); |
| 903 | } |
| 904 | |
| 905 | |
| 906 | } |