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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v0.5
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v05.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  ******************************************************************************/
  11 package net.sourceforge.phpdt.internal.compiler.classfmt;
  12
  13 import java.io.File;
  14 import java.io.IOException;
  15 import java.util.Arrays;
  16
  17 import net.sourceforge.phpdt.internal.compiler.codegen.AttributeNamesConstants;
  18 import net.sourceforge.phpdt.internal.compiler.env.IBinaryField;
  19 import net.sourceforge.phpdt.internal.compiler.env.IBinaryMethod;
  20 import net.sourceforge.phpdt.internal.compiler.env.IBinaryNestedType;
  21 import net.sourceforge.phpdt.internal.compiler.env.IBinaryType;
  22 import net.sourceforge.phpdt.internal.compiler.impl.Constant;
  23 import net.sourceforge.phpdt.internal.compiler.impl.NullConstant;
  24 import net.sourceforge.phpdt.internal.compiler.lookup.TypeIds;
  25 import net.sourceforge.phpdt.internal.compiler.util.CharOperation;
  26 import net.sourceforge.phpdt.internal.compiler.util.Util;
  27
  28 public class ClassFileReader extends ClassFileStruct implements AttributeNamesConstants, IBinaryType {
  29         private int constantPoolCount;
  30         private int[] constantPoolOffsets;
  31         private int accessFlags;
  32         private char[] className;
  33         private char[] superclassName;
  34         private int interfacesCount;
  35         private char[][] interfaceNames;
  36         private int fieldsCount;
  37         private FieldInfo[] fields;
  38         private int methodsCount;
  39         private MethodInfo[] methods;
  40         private InnerClassInfo[] innerInfos;
  41         private char[] sourceFileName;
  42         // initialized in case the .class file is a nested type
  43         private InnerClassInfo innerInfo;
  44         private char[] classFileName;
  45         private int classNameIndex;
  46         private int innerInfoIndex;
  47 /**
  48  * @param classFileBytes byte[]
  49  *              Actual bytes of a .class file
  50  *
  51  * @param fileName char[]
  52  *              Actual name of the file that contains the bytes, can be null
  53  *
  54  * @param fullyInitialize boolean
  55  *              Flag to fully initialize the new object
  56  * @exception ClassFormatException
  57  */
  58 public ClassFileReader(byte[] classFileBytes, char[] fileName, boolean fullyInitialize) throws ClassFormatException {
  59         // This method looks ugly but is actually quite simple, the constantPool is constructed
  60         // in 3 passes.  All non-primitive constant pool members that usually refer to other members
  61         // by index are tweaked to have their value in inst vars, this minor cost at read-time makes
  62         // all subsequent uses of the constant pool element faster.
  63         super(classFileBytes, 0);
  64         this.classFileName = fileName;
  65         int readOffset = 10;
  66         try {
  67                 constantPoolCount = this.u2At(8);
  68                 // Pass #1 - Fill in all primitive constants
  69                 this.constantPoolOffsets = new int[constantPoolCount];
  70                 for (int i = 1; i < constantPoolCount; i++) {
  71                         int tag = this.u1At(readOffset);
  72                         switch (tag) {
  73                                 case Utf8Tag :
  74                                         this.constantPoolOffsets[i] = readOffset;
  75                                         readOffset += u2At(readOffset + 1);
  76                                         readOffset += ConstantUtf8FixedSize;
  77                                         break;
  78                                 case IntegerTag :
  79                                         this.constantPoolOffsets[i] = readOffset;
  80                                         readOffset += ConstantIntegerFixedSize;
  81                                         break;
  82                                 case FloatTag :
  83                                         this.constantPoolOffsets[i] = readOffset;
  84                                         readOffset += ConstantFloatFixedSize;
  85                                         break;
  86                                 case LongTag :
  87                                         this.constantPoolOffsets[i] = readOffset;
  88                                         readOffset += ConstantLongFixedSize;
  89                                         i++;
  90                                         break;
  91                                 case DoubleTag :
  92                                         this.constantPoolOffsets[i] = readOffset;
  93                                         readOffset += ConstantDoubleFixedSize;
  94                                         i++;
  95                                         break;
  96                                 case ClassTag :
  97                                         this.constantPoolOffsets[i] = readOffset;
  98                                         readOffset += ConstantClassFixedSize;
  99                                         break;
 100                                 case StringTag :
 101                                         this.constantPoolOffsets[i] = readOffset;
 102                                         readOffset += ConstantStringFixedSize;
 103                                         break;
 104                                 case FieldRefTag :
 105                                         this.constantPoolOffsets[i] = readOffset;
 106                                         readOffset += ConstantFieldRefFixedSize;
 107                                         break;
 108                                 case MethodRefTag :
 109                                         this.constantPoolOffsets[i] = readOffset;
 110                                         readOffset += ConstantMethodRefFixedSize;
 111                                         break;
 112                                 case InterfaceMethodRefTag :
 113                                         this.constantPoolOffsets[i] = readOffset;
 114                                         readOffset += ConstantInterfaceMethodRefFixedSize;
 115                                         break;
 116                                 case NameAndTypeTag :
 117                                         this.constantPoolOffsets[i] = readOffset;
 118                                         readOffset += ConstantNameAndTypeFixedSize;
 119                         }
 120                 }
 121                 // Read and validate access flags
 122                 this.accessFlags = u2At(readOffset);
 123                 readOffset += 2;
 124
 125                 // Read the classname, use exception handlers to catch bad format
 126                 this.classNameIndex = u2At(readOffset);
 127                 this.className = getConstantClassNameAt(this.classNameIndex);
 128                 readOffset += 2;
 129
 130                 // Read the superclass name, can be null for java.lang.Object
 131                 int superclassNameIndex = u2At(readOffset);
 132                 readOffset += 2;
 133                 // if superclassNameIndex is equals to 0 there is no need to set a value for the
 134                 // field this.superclassName. null is fine.
 135                 if (superclassNameIndex != 0) {
 136                         this.superclassName = getConstantClassNameAt(superclassNameIndex);
 137                 }
 138
 139                 // Read the interfaces, use exception handlers to catch bad format
 140                 this.interfacesCount = u2At(readOffset);
 141                 readOffset += 2;
 142                 if (this.interfacesCount != 0) {
 143                         this.interfaceNames = new char[this.interfacesCount][];
 144                         for (int i = 0; i < this.interfacesCount; i++) {
 145                                 this.interfaceNames[i] = getConstantClassNameAt(u2At(readOffset));
 146                                 readOffset += 2;
 147                         }
 148                 }
 149                 // Read the this.fields, use exception handlers to catch bad format
 150                 this.fieldsCount = u2At(readOffset);
 151                 readOffset += 2;
 152                 if (this.fieldsCount != 0) {
 153                         FieldInfo field;
 154                         this.fields = new FieldInfo[this.fieldsCount];
 155                         for (int i = 0; i < this.fieldsCount; i++) {
 156                                 field = new FieldInfo(reference, this.constantPoolOffsets, readOffset);
 157                                 this.fields[i] = field;
 158                                 readOffset += field.sizeInBytes();
 159                         }
 160                 }
 161                 // Read the this.methods
 162                 this.methodsCount = u2At(readOffset);
 163                 readOffset += 2;
 164                 if (this.methodsCount != 0) {
 165                         this.methods = new MethodInfo[this.methodsCount];
 166                         MethodInfo method;
 167                         for (int i = 0; i < this.methodsCount; i++) {
 168                                 method = new MethodInfo(reference, this.constantPoolOffsets, readOffset);
 169                                 this.methods[i] = method;
 170                                 readOffset += method.sizeInBytes();
 171                         }
 172                 }
 173
 174                 // Read the attributes
 175                 int attributesCount = u2At(readOffset);
 176                 readOffset += 2;
 177
 178                 for (int i = 0; i < attributesCount; i++) {
 179                         int utf8Offset = this.constantPoolOffsets[u2At(readOffset)];
 180                         char[] attributeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
 181                         if (CharOperation.equals(attributeName, DeprecatedName)) {
 182                                 this.accessFlags |= AccDeprecated;
 183                         } else {
 184                                 if (CharOperation.equals(attributeName, InnerClassName)) {
 185                                         int innerOffset = readOffset + 6;
 186                                         int number_of_classes = u2At(innerOffset);
 187                                         if (number_of_classes != 0) {
 188                                                 this.innerInfos = new InnerClassInfo[number_of_classes];
 189                                                 for (int j = 0; j < number_of_classes; j++) {
 190                                                         this.innerInfos[j] =
 191                                                                 new InnerClassInfo(reference, this.constantPoolOffsets, innerOffset + 2);
 192                                                         if (this.classNameIndex == this.innerInfos[j].innerClassNameIndex) {
 193                                                                 this.innerInfo = this.innerInfos[j];
 194                                                                 this.innerInfoIndex = j;
 195                                                         }
 196                                                         innerOffset += 8;
 197                                                 }
 198                                         }
 199                                 } else {
 200                                         if (CharOperation.equals(attributeName, SourceName)) {
 201                                                 utf8Offset = this.constantPoolOffsets[u2At(readOffset + 6)];
 202                                                 this.sourceFileName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
 203                                         } else {
 204                                                 if (CharOperation.equals(attributeName, SyntheticName)) {
 205                                                         this.accessFlags |= AccSynthetic;
 206                                                 }
 207                                         }
 208                                 }
 209                         }
 210                         readOffset += (6 + u4At(readOffset + 2));
 211                 }
 212                 if (fullyInitialize) {
 213                         this.initialize();
 214                 }
 215         } catch (Exception e) {
 216                 throw new ClassFormatException(
 217                         ClassFormatException.ErrTruncatedInput,
 218                         readOffset);
 219         }
 220 }
 221
 222 /**
 223  * @param classFileBytes Actual bytes of a .class file
 224  * @param fileName      Actual name of the file that contains the bytes, can be null
 225  *
 226  * @exception ClassFormatException
 227  */
 228 public ClassFileReader(byte classFileBytes[], char[] fileName) throws ClassFormatException {
 229         this(classFileBytes, fileName, false);
 230 }
 231
 232 /**
 233  *      Answer the receiver's access flags.  The value of the access_flags
 234  *      item is a mask of modifiers used with class and interface declarations.
 235  *  @return int
 236  */
 237 public int accessFlags() {
 238         return this.accessFlags;
 239 }
 240 /**
 241  * Answer the char array that corresponds to the class name of the constant class.
 242  * constantPoolIndex is the index in the constant pool that is a constant class entry.
 243  *
 244  * @param int constantPoolIndex
 245  * @return char[]
 246  */
 247 private char[] getConstantClassNameAt(int constantPoolIndex) {
 248         int utf8Offset = this.constantPoolOffsets[u2At(this.constantPoolOffsets[constantPoolIndex] + 1)];
 249         return utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
 250 }
 251 /**
 252  * Answer the int array that corresponds to all the offsets of each entry in the constant pool
 253  *
 254  * @return int[]
 255  */
 256 public int[] getConstantPoolOffsets() {
 257         return this.constantPoolOffsets;
 258 }
 259 /*
 260  * Answer the resolved compoundName of the enclosing type
 261  * or null if the receiver is a top level type.
 262  */
 263 public char[] getEnclosingTypeName() {
 264         if (this.innerInfo != null && !this.isAnonymous()) {
 265                 return this.innerInfo.getEnclosingTypeName();
 266         }
 267         return null;
 268 }
 269 /**
 270  * Answer the receiver's this.fields or null if the array is empty.
 271  * @return org.eclipse.jdt.internal.compiler.api.IBinaryField[]
 272  */
 273 public IBinaryField[] getFields() {
 274         return this.fields;
 275 }
 276 /**
 277  * Answer the file name which defines the type.
 278  * The format is unspecified.
 279  */
 280 public char[] getFileName() {
 281         return this.classFileName;
 282 }
 283 /**
 284  * Answer the source name if the receiver is a inner type. Return null if it is an anonymous class or if the receiver is a top-level class.
 285  * e.g.
 286  * public class A {
 287  *      public class B {
 288  *      }
 289  *      public void foo() {
 290  *              class C {}
 291  *      }
 292  *      public Runnable bar() {
 293  *              return new Runnable() {
 294  *                      public void run() {}
 295  *              };
 296  *      }
 297  * }
 298  * It returns {'B'} for the member A$B
 299  * It returns null for A
 300  * It returns {'C'} for the local class A$1$C
 301  * It returns null for the anonymous A$1
 302  * @return char[]
 303  */
 304 public char[] getInnerSourceName() {
 305         if (this.innerInfo != null)
 306                 return this.innerInfo.getSourceName();
 307         return null;
 308 }
 309 /**
 310  * Answer the resolved names of the receiver's interfaces in the
 311  * class file format as specified in section 4.2 of the Java 2 VM spec
 312  * or null if the array is empty.
 313  *
 314  * For example, java.lang.String is java/lang/String.
 315  * @return char[][]
 316  */
 317 public char[][] getInterfaceNames() {
 318         return this.interfaceNames;
 319 }
 320 /**
 321  * Answer the receiver's nested types or null if the array is empty.
 322  *
 323  * This nested type info is extracted from the inner class attributes.
 324  * Ask the name environment to find a member type using its compound name
 325  * @return org.eclipse.jdt.internal.compiler.api.IBinaryNestedType[]
 326  */
 327 public IBinaryNestedType[] getMemberTypes() {
 328         // we might have some member types of the current type
 329         if (this.innerInfos == null) return null;
 330
 331         int length = this.innerInfos.length;
 332         int startingIndex = this.innerInfo != null ? this.innerInfoIndex + 1 : 0;
 333         if (length != startingIndex) {
 334                 IBinaryNestedType[] memberTypes =
 335                         new IBinaryNestedType[length - this.innerInfoIndex];
 336                 int memberTypeIndex = 0;
 337                 for (int i = startingIndex; i < length; i++) {
 338                         InnerClassInfo currentInnerInfo = this.innerInfos[i];
 339                         int outerClassNameIdx = currentInnerInfo.outerClassNameIndex;
 340                         int innerNameIndex = currentInnerInfo.innerNameIndex;
 341                         /*
 342                          * Checking that outerClassNameIDx is different from 0 should be enough to determine if an inner class
 343                          * attribute entry is a member class, but due to the bug:
 344                          * http://dev.eclipse.org/bugs/show_bug.cgi?id=14592
 345                          * we needed to add an extra check. So we check that innerNameIndex is different from 0 as well.
 346                          */
 347                         if (outerClassNameIdx != 0 && innerNameIndex != 0 && outerClassNameIdx == this.classNameIndex) {
 348                                 memberTypes[memberTypeIndex++] = currentInnerInfo;
 349                         }
 350                 }
 351                 if (memberTypeIndex == 0) return null;
 352                 if (memberTypeIndex != memberTypes.length) {
 353                         // we need to resize the memberTypes array. Some local or anonymous classes
 354                         // are present in the current class.
 355                         System.arraycopy(
 356                                 memberTypes,
 357                                 0,
 358                                 (memberTypes = new IBinaryNestedType[memberTypeIndex]),
 359                                 0,
 360                                 memberTypeIndex);
 361                 }
 362                 return memberTypes;
 363         }
 364         return null;
 365 }
 366 /**
 367  * Answer the receiver's this.methods or null if the array is empty.
 368  * @return org.eclipse.jdt.internal.compiler.api.env.IBinaryMethod[]
 369  */
 370 public IBinaryMethod[] getMethods() {
 371         return this.methods;
 372 }
 373 /**
 374  * Answer an int whose bits are set according the access constants
 375  * defined by the VM spec.
 376  * Set the AccDeprecated and AccSynthetic bits if necessary
 377  * @return int
 378  */
 379 public int getModifiers() {
 380         if (this.innerInfo != null) {
 381                 return this.innerInfo.getModifiers();
 382         }
 383         return this.accessFlags;
 384 }
 385 /**
 386  * Answer the resolved name of the type in the
 387  * class file format as specified in section 4.2 of the Java 2 VM spec.
 388  *
 389  * For example, java.lang.String is java/lang/String.
 390  * @return char[]
 391  */
 392 public char[] getName() {
 393         return this.className;
 394 }
 395 /**
 396  * Answer the resolved name of the receiver's superclass in the
 397  * class file format as specified in section 4.2 of the Java 2 VM spec
 398  * or null if it does not have one.
 399  *
 400  * For example, java.lang.String is java/lang/String.
 401  * @return char[]
 402  */
 403 public char[] getSuperclassName() {
 404         return this.superclassName;
 405 }
 406 /**
 407  * Answer true if the receiver is an anonymous type, false otherwise
 408  *
 409  * @return <CODE>boolean</CODE>
 410  */
 411 public boolean isAnonymous() {
 412         if (this.innerInfo == null) return false;
 413         char[] sourceName = this.innerInfo.getSourceName();
 414         return (sourceName == null || sourceName.length == 0);
 415 }
 416 /**
 417  * Answer whether the receiver contains the resolved binary form
 418  * or the unresolved source form of the type.
 419  * @return boolean
 420  */
 421 public boolean isBinaryType() {
 422         return true;
 423 }
 424 /**
 425  * Answer true if the receiver is a class. False otherwise.
 426  * @return boolean
 427  */
 428 public boolean isClass() {
 429         return (getModifiers() & AccInterface) == 0;
 430 }
 431 /**
 432  * Answer true if the receiver is an interface. False otherwise.
 433  * @return boolean
 434  */
 435 public boolean isInterface() {
 436         return (getModifiers() & AccInterface) != 0;
 437 }
 438 /**
 439  * Answer true if the receiver is a local type, false otherwise
 440  *
 441  * @return <CODE>boolean</CODE>
 442  */
 443 public boolean isLocal() {
 444         return
 445                 this.innerInfo != null
 446                 && this.innerInfo.getEnclosingTypeName() == null
 447                 && this.innerInfo.getSourceName() != null;
 448 }
 449 /**
 450  * Answer true if the receiver is a member type, false otherwise
 451  *
 452  * @return <CODE>boolean</CODE>
 453  */
 454 public boolean isMember() {
 455         return this.innerInfo != null && this.innerInfo.getEnclosingTypeName() != null;
 456 }
 457 /**
 458  * Answer true if the receiver is a nested type, false otherwise
 459  *
 460  * @return <CODE>boolean</CODE>
 461  */
 462 public boolean isNestedType() {
 463         return this.innerInfo != null;
 464 }
 465 public static ClassFileReader read(File file) throws ClassFormatException, IOException {
 466         return read(file, false);
 467 }
 468 public static ClassFileReader read(File file, boolean fullyInitialize) throws ClassFormatException, IOException {
 469         byte classFileBytes[] = Util.getFileByteContent(file);
 470         ClassFileReader classFileReader = new ClassFileReader(classFileBytes, file.getAbsolutePath().toCharArray());
 471         if (fullyInitialize) {
 472                 classFileReader.initialize();
 473         }
 474         return classFileReader;
 475 }
 476 public static ClassFileReader read(String fileName) throws ClassFormatException, java.io.IOException {
 477         return read(fileName, false);
 478 }
 479 public static ClassFileReader read(String fileName, boolean fullyInitialize) throws ClassFormatException, java.io.IOException {
 480         return read(new File(fileName), fullyInitialize);
 481 }
 482 public static ClassFileReader read(
 483         java.util.zip.ZipFile zip,
 484         String filename)
 485         throws ClassFormatException, java.io.IOException {
 486                 return read(zip, filename, false);
 487 }
 488 public static ClassFileReader read(
 489         java.util.zip.ZipFile zip,
 490         String filename,
 491         boolean fullyInitialize)
 492         throws ClassFormatException, java.io.IOException {
 493         java.util.zip.ZipEntry ze = zip.getEntry(filename);
 494         if (ze == null)
 495                 return null;
 496         byte classFileBytes[] = Util.getZipEntryByteContent(ze, zip);
 497         ClassFileReader classFileReader = new ClassFileReader(classFileBytes, filename.toCharArray());
 498         if (fullyInitialize) {
 499                 classFileReader.initialize();
 500         }
 501         return classFileReader;
 502 }
 503
 504 /**
 505  * Answer the source file name attribute. Return null if there is no source file attribute for the receiver.
 506  *
 507  * @return char[]
 508  */
 509 public char[] sourceFileName() {
 510         return this.sourceFileName;
 511 }
 512 public String toString() {
 513         java.io.ByteArrayOutputStream out = new java.io.ByteArrayOutputStream();
 514         java.io.PrintWriter print = new java.io.PrintWriter(out);
 515
 516         print.println(this.getClass().getName() + "{"); //$NON-NLS-1$
 517         print.println(" this.className: " + new String(getName())); //$NON-NLS-1$
 518         print.println(" this.superclassName: " + (getSuperclassName() == null ? "null" : new String(getSuperclassName()))); //$NON-NLS-2$ //$NON-NLS-1$
 519         print.println(" access_flags: " + ClassFileStruct.printTypeModifiers(this.accessFlags()) + "(" + this.accessFlags() + ")"); //$NON-NLS-1$ //$NON-NLS-3$ //$NON-NLS-2$
 520
 521         print.flush();
 522         return out.toString();
 523 }
 524 /**
 525  * Check if the receiver has structural changes compare to the byte array in argument.
 526  * Structural changes are:
 527  * - modifiers changes for the class, the this.fields or the this.methods
 528  * - signature changes for this.fields or this.methods.
 529  * - changes in the number of this.fields or this.methods
 530  * - changes for field constants
 531  * - changes for thrown exceptions
 532  * - change for the super class or any super interfaces.
 533  * - changes for member types name or modifiers
 534  * If any of these changes occurs, the method returns true. false otherwise.
 535  * The synthetic fields are included and the members are not required to be sorted.
 536  * @param newBytes the bytes of the .class file we want to compare the receiver to
 537  * @return boolean Returns true is there is a structural change between the two .class files, false otherwise
 538  */
 539 public boolean hasStructuralChanges(byte[] newBytes) {
 540         return hasStructuralChanges(newBytes, true, true);
 541 }
 542 /**
 543  * Check if the receiver has structural changes compare to the byte array in argument.
 544  * Structural changes are:
 545  * - modifiers changes for the class, the this.fields or the this.methods
 546  * - signature changes for this.fields or this.methods.
 547  * - changes in the number of this.fields or this.methods
 548  * - changes for field constants
 549  * - changes for thrown exceptions
 550  * - change for the super class or any super interfaces.
 551  * - changes for member types name or modifiers
 552  * If any of these changes occurs, the method returns true. false otherwise.
 553  * @param newBytes the bytes of the .class file we want to compare the receiver to
 554  * @param orderRequired a boolean indicating whether the members should be sorted or not
 555  * @param excludesSynthetics a boolean indicating whether the synthetic members should be used in the comparison
 556  * @return boolean Returns true is there is a structural change between the two .class files, false otherwise
 557  */
 558 public boolean hasStructuralChanges(byte[] newBytes, boolean orderRequired, boolean excludesSynthetic) {
 559         try {
 560                 ClassFileReader newClassFile =
 561                         new ClassFileReader(newBytes, this.classFileName);
 562                 // type level comparison
 563                 // modifiers
 564                 if (this.getModifiers() != newClassFile.getModifiers())
 565                         return true;
 566                 // superclass
 567                 if (!CharOperation.equals(this.getSuperclassName(), newClassFile.getSuperclassName()))
 568                         return true;
 569                 // interfaces
 570                 char[][] newInterfacesNames = newClassFile.getInterfaceNames();
 571                 if (this.interfaceNames != newInterfacesNames) { // TypeConstants.NoSuperInterfaces
 572                         int newInterfacesLength = newInterfacesNames == null ? 0 : newInterfacesNames.length;
 573                         if (newInterfacesLength != this.interfacesCount)
 574                                 return true;
 575                         for (int i = 0, max = this.interfacesCount; i < max; i++)
 576                                 if (!CharOperation.equals(this.interfaceNames[i], newInterfacesNames[i]))
 577                                         return true;
 578                 }
 579
 580                 // member types
 581                 IBinaryNestedType[] currentMemberTypes = (IBinaryNestedType[]) this.getMemberTypes();
 582                 IBinaryNestedType[] otherMemberTypes = (IBinaryNestedType[]) newClassFile.getMemberTypes();
 583                 if (currentMemberTypes != otherMemberTypes) { // TypeConstants.NoMemberTypes
 584                         int currentMemberTypeLength = currentMemberTypes == null ? 0 : currentMemberTypes.length;
 585                         int otherMemberTypeLength = otherMemberTypes == null ? 0 : otherMemberTypes.length;
 586                         if (currentMemberTypeLength != otherMemberTypeLength)
 587                                 return true;
 588                         for (int i = 0; i < currentMemberTypeLength; i++)
 589                                 if (!CharOperation.equals(currentMemberTypes[i].getName(), otherMemberTypes[i].getName())
 590                                         || currentMemberTypes[i].getModifiers() != otherMemberTypes[i].getModifiers())
 591                                                 return true;
 592                 }
 593
 594                 // fields
 595                 FieldInfo[] otherFieldInfos = (FieldInfo[]) newClassFile.getFields();
 596                 int otherFieldInfosLength = otherFieldInfos == null ? 0 : otherFieldInfos.length;
 597                 boolean compareFields = true;
 598                 if (this.fieldsCount == otherFieldInfosLength) {
 599                         int i = 0;
 600                         for (; i < this.fieldsCount; i++)
 601                                 if (hasStructuralFieldChanges(this.fields[i], otherFieldInfos[i])) break;
 602                         if ((compareFields = i != this.fieldsCount) && !orderRequired && !excludesSynthetic)
 603                                 return true;
 604                 }
 605                 if (compareFields) {
 606                         if (this.fieldsCount != otherFieldInfosLength && !excludesSynthetic)
 607                                 return true;
 608                         if (orderRequired) {
 609                                 if (this.fieldsCount != 0)
 610                                         Arrays.sort(this.fields);
 611                                 if (otherFieldInfosLength != 0)
 612                                         Arrays.sort(otherFieldInfos);
 613                         }
 614                         if (excludesSynthetic) {
 615                                 if (hasNonSyntheticFieldChanges(this.fields, otherFieldInfos))
 616                                         return true;
 617                         } else {
 618                                 for (int i = 0; i < this.fieldsCount; i++)
 619                                         if (hasStructuralFieldChanges(this.fields[i], otherFieldInfos[i]))
 620                                                 return true;
 621                         }
 622                 }
 623
 624                 // methods
 625                 MethodInfo[] otherMethodInfos = (MethodInfo[]) newClassFile.getMethods();
 626                 int otherMethodInfosLength = otherMethodInfos == null ? 0 : otherMethodInfos.length;
 627                 boolean compareMethods = true;
 628                 if (this.methodsCount == otherMethodInfosLength) {
 629                         int i = 0;
 630                         for (; i < this.methodsCount; i++)
 631                                 if (hasStructuralMethodChanges(this.methods[i], otherMethodInfos[i])) break;
 632                         if ((compareMethods = i != this.methodsCount) && !orderRequired && !excludesSynthetic)
 633                                 return true;
 634                 }
 635                 if (compareMethods) {
 636                         if (this.methodsCount != otherMethodInfosLength && !excludesSynthetic)
 637                                 return true;
 638                         if (orderRequired) {
 639                                 if (this.methodsCount != 0)
 640                                         Arrays.sort(this.methods);
 641                                 if (otherMethodInfosLength != 0)
 642                                         Arrays.sort(otherMethodInfos);
 643                         }
 644                         if (excludesSynthetic) {
 645                                 if (hasNonSyntheticMethodChanges(this.methods, otherMethodInfos))
 646                                         return true;
 647                         } else {
 648                                 for (int i = 0; i < this.methodsCount; i++)
 649                                         if (hasStructuralMethodChanges(this.methods[i], otherMethodInfos[i]))
 650                                                 return true;
 651                         }
 652                 }
 653
 654                 return false;
 655         } catch (ClassFormatException e) {
 656                 return true;
 657         }
 658 }
 659 private boolean hasNonSyntheticFieldChanges(FieldInfo[] currentFieldInfos, FieldInfo[] otherFieldInfos) {
 660         int length1 = currentFieldInfos == null ? 0 : currentFieldInfos.length;
 661         int length2 = otherFieldInfos == null ? 0 : otherFieldInfos.length;
 662         int index1 = 0;
 663         int index2 = 0;
 664
 665         end : while (index1 < length1 && index2 < length2) {
 666                 while (currentFieldInfos[index1].isSynthetic()) {
 667                         if (++index1 >= length1) break end;
 668                 }
 669                 while (otherFieldInfos[index2].isSynthetic()) {
 670                         if (++index2 >= length2) break end;
 671                 }
 672                 if (hasStructuralFieldChanges(currentFieldInfos[index1++], otherFieldInfos[index2++]))
 673                         return true;
 674         }
 675
 676         while (index1 < length1) {
 677                 if (!currentFieldInfos[index1++].isSynthetic()) return true;
 678         }
 679         while (index2 < length2) {
 680                 if (!otherFieldInfos[index2++].isSynthetic()) return true;
 681         }
 682         return false;
 683 }
 684 private boolean hasStructuralFieldChanges(FieldInfo currentFieldInfo, FieldInfo otherFieldInfo) {
 685         if (currentFieldInfo.getModifiers() != otherFieldInfo.getModifiers())
 686                 return true;
 687         if (!CharOperation.equals(currentFieldInfo.getName(), otherFieldInfo.getName()))
 688                 return true;
 689         if (!CharOperation.equals(currentFieldInfo.getTypeName(), otherFieldInfo.getTypeName()))
 690                 return true;
 691         if (currentFieldInfo.hasConstant() != otherFieldInfo.hasConstant())
 692                 return true;
 693         if (currentFieldInfo.hasConstant()) {
 694                 Constant currentConstant = currentFieldInfo.getConstant();
 695                 Constant otherConstant = otherFieldInfo.getConstant();
 696                 if (currentConstant.typeID() != otherConstant.typeID())
 697                         return true;
 698                 if (!currentConstant.getClass().equals(otherConstant.getClass()))
 699                         return true;
 700                 switch (currentConstant.typeID()) {
 701                         case TypeIds.T_int :
 702                                 return currentConstant.intValue() != otherConstant.intValue();
 703                         case TypeIds.T_byte :
 704                                 return currentConstant.byteValue() != otherConstant.byteValue();
 705                         case TypeIds.T_short :
 706                                 return currentConstant.shortValue() != otherConstant.shortValue();
 707                         case TypeIds.T_char :
 708                                 return currentConstant.charValue() != otherConstant.charValue();
 709                         case TypeIds.T_float :
 710                                 return currentConstant.floatValue() != otherConstant.floatValue();
 711                         case TypeIds.T_double :
 712                                 return currentConstant.doubleValue() != otherConstant.doubleValue();
 713                         case TypeIds.T_boolean :
 714                                 return currentConstant.booleanValue() != otherConstant.booleanValue();
 715                         case TypeIds.T_String :
 716                                 return !currentConstant.stringValue().equals(otherConstant.stringValue());
 717                         case TypeIds.T_null :
 718                                 return otherConstant != NullConstant.Default;
 719                 }
 720         }
 721         return false;
 722 }
 723 private boolean hasNonSyntheticMethodChanges(MethodInfo[] currentMethodInfos, MethodInfo[] otherMethodInfos) {
 724         int length1 = currentMethodInfos == null ? 0 : currentMethodInfos.length;
 725         int length2 = otherMethodInfos == null ? 0 : otherMethodInfos.length;
 726         int index1 = 0;
 727         int index2 = 0;
 728
 729         MethodInfo m;
 730         end : while (index1 < length1 && index2 < length2) {
 731                 while ((m = currentMethodInfos[index1]).isSynthetic() || m.isClinit()) {
 732                         if (++index1 >= length1) break end;
 733                 }
 734                 while ((m = otherMethodInfos[index2]).isSynthetic() || m.isClinit()) {
 735                         if (++index2 >= length2) break end;
 736                 }
 737                 if (hasStructuralMethodChanges(currentMethodInfos[index1++], otherMethodInfos[index2++]))
 738                         return true;
 739         }
 740
 741         while (index1 < length1) {
 742                 if (!((m = currentMethodInfos[index1++]).isSynthetic() || m.isClinit())) return true;
 743         }
 744         while (index2 < length2) {
 745                 if (!((m = otherMethodInfos[index2++]).isSynthetic() || m.isClinit())) return true;
 746         }
 747         return false;
 748 }
 749 private boolean hasStructuralMethodChanges(MethodInfo currentMethodInfo, MethodInfo otherMethodInfo) {
 750         if (currentMethodInfo.getModifiers() != otherMethodInfo.getModifiers())
 751                 return true;
 752         if (!CharOperation.equals(currentMethodInfo.getSelector(), otherMethodInfo.getSelector()))
 753                 return true;
 754         if (!CharOperation.equals(currentMethodInfo.getMethodDescriptor(), otherMethodInfo.getMethodDescriptor()))
 755                 return true;
 756
 757         char[][] currentThrownExceptions = currentMethodInfo.getExceptionTypeNames();
 758         char[][] otherThrownExceptions = otherMethodInfo.getExceptionTypeNames();
 759         if (currentThrownExceptions != otherThrownExceptions) { // TypeConstants.NoExceptions
 760                 int currentThrownExceptionsLength = currentThrownExceptions == null ? 0 : currentThrownExceptions.length;
 761                 int otherThrownExceptionsLength = otherThrownExceptions == null ? 0 : otherThrownExceptions.length;
 762                 if (currentThrownExceptionsLength != otherThrownExceptionsLength)
 763                         return true;
 764                 for (int k = 0; k < currentThrownExceptionsLength; k++)
 765                         if (!CharOperation.equals(currentThrownExceptions[k], otherThrownExceptions[k]))
 766                                 return true;
 767         }
 768         return false;
 769 }
 770 /**
 771  * This method is used to fully initialize the contents of the receiver. All methodinfos, fields infos
 772  * will be therefore fully initialized and we can get rid of the bytes.
 773  */
 774 private void initialize() {
 775         for (int i = 0, max = fieldsCount; i < max; i++) {
 776                 fields[i].initialize();
 777         }
 778         for (int i = 0, max = methodsCount; i < max; i++) {
 779                 methods[i].initialize();
 780         }
 781         if (innerInfos != null) {
 782                 for (int i = 0, max = innerInfos.length; i < max; i++) {
 783                         innerInfos[i].initialize();
 784                 }
 785         }
 786         this.reset();
 787 }
 788 protected void reset() {
 789         this.constantPoolOffsets = null;
 790         super.reset();
 791 }
 792
 793 }