ClassReader.java revision 3155:30e288cb2d22
1/* 2 * Copyright (c) 1999, 2015, 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 26package com.sun.tools.javac.jvm; 27 28import java.io.*; 29import java.net.URI; 30import java.net.URISyntaxException; 31import java.nio.CharBuffer; 32import java.util.Arrays; 33import java.util.EnumSet; 34import java.util.HashMap; 35import java.util.HashSet; 36import java.util.Map; 37import java.util.Set; 38 39import javax.lang.model.element.Modifier; 40import javax.lang.model.element.NestingKind; 41import javax.tools.JavaFileManager; 42import javax.tools.JavaFileObject; 43 44import com.sun.tools.javac.comp.Annotate; 45import com.sun.tools.javac.comp.Annotate.AnnotationTypeCompleter; 46import com.sun.tools.javac.code.*; 47import com.sun.tools.javac.code.Lint.LintCategory; 48import com.sun.tools.javac.code.Scope.WriteableScope; 49import com.sun.tools.javac.code.Symbol.*; 50import com.sun.tools.javac.code.Symtab; 51import com.sun.tools.javac.code.Type.*; 52import com.sun.tools.javac.comp.Annotate.AnnotationTypeMetadata; 53import com.sun.tools.javac.file.BaseFileManager; 54import com.sun.tools.javac.file.PathFileObject; 55import com.sun.tools.javac.jvm.ClassFile.NameAndType; 56import com.sun.tools.javac.jvm.ClassFile.Version; 57import com.sun.tools.javac.util.*; 58import com.sun.tools.javac.util.DefinedBy.Api; 59import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 60 61import static com.sun.tools.javac.code.Flags.*; 62import static com.sun.tools.javac.code.Kinds.Kind.*; 63import static com.sun.tools.javac.code.TypeTag.ARRAY; 64import static com.sun.tools.javac.code.TypeTag.CLASS; 65import static com.sun.tools.javac.code.TypeTag.TYPEVAR; 66import static com.sun.tools.javac.jvm.ClassFile.*; 67import static com.sun.tools.javac.jvm.ClassFile.Version.*; 68 69import static com.sun.tools.javac.main.Option.*; 70 71/** This class provides operations to read a classfile into an internal 72 * representation. The internal representation is anchored in a 73 * ClassSymbol which contains in its scope symbol representations 74 * for all other definitions in the classfile. Top-level Classes themselves 75 * appear as members of the scopes of PackageSymbols. 76 * 77 * <p><b>This is NOT part of any supported API. 78 * If you write code that depends on this, you do so at your own risk. 79 * This code and its internal interfaces are subject to change or 80 * deletion without notice.</b> 81 */ 82public class ClassReader { 83 /** The context key for the class reader. */ 84 protected static final Context.Key<ClassReader> classReaderKey = new Context.Key<>(); 85 86 public static final int INITIAL_BUFFER_SIZE = 0x0fff0; 87 88 private final Annotate annotate; 89 90 /** Switch: verbose output. 91 */ 92 boolean verbose; 93 94 /** Switch: check class file for correct minor version, unrecognized 95 * attributes. 96 */ 97 boolean checkClassFile; 98 99 /** Switch: read constant pool and code sections. This switch is initially 100 * set to false but can be turned on from outside. 101 */ 102 public boolean readAllOfClassFile = false; 103 104 /** Switch: allow simplified varargs. 105 */ 106 boolean allowSimplifiedVarargs; 107 108 /** Lint option: warn about classfile issues 109 */ 110 boolean lintClassfile; 111 112 /** Switch: preserve parameter names from the variable table. 113 */ 114 public boolean saveParameterNames; 115 116 /** 117 * The currently selected profile. 118 */ 119 public final Profile profile; 120 121 /** The log to use for verbose output 122 */ 123 final Log log; 124 125 /** The symbol table. */ 126 Symtab syms; 127 128 Types types; 129 130 /** The name table. */ 131 final Names names; 132 133 /** Access to files 134 */ 135 private final JavaFileManager fileManager; 136 137 /** Factory for diagnostics 138 */ 139 JCDiagnostic.Factory diagFactory; 140 141 /** The current scope where type variables are entered. 142 */ 143 protected WriteableScope typevars; 144 145 /** The path name of the class file currently being read. 146 */ 147 protected JavaFileObject currentClassFile = null; 148 149 /** The class or method currently being read. 150 */ 151 protected Symbol currentOwner = null; 152 153 /** The buffer containing the currently read class file. 154 */ 155 byte[] buf = new byte[INITIAL_BUFFER_SIZE]; 156 157 /** The current input pointer. 158 */ 159 protected int bp; 160 161 /** The objects of the constant pool. 162 */ 163 Object[] poolObj; 164 165 /** For every constant pool entry, an index into buf where the 166 * defining section of the entry is found. 167 */ 168 int[] poolIdx; 169 170 /** The major version number of the class file being read. */ 171 int majorVersion; 172 /** The minor version number of the class file being read. */ 173 int minorVersion; 174 175 /** A table to hold the constant pool indices for method parameter 176 * names, as given in LocalVariableTable attributes. 177 */ 178 int[] parameterNameIndices; 179 180 /** 181 * Whether or not any parameter names have been found. 182 */ 183 boolean haveParameterNameIndices; 184 185 /** Set this to false every time we start reading a method 186 * and are saving parameter names. Set it to true when we see 187 * MethodParameters, if it's set when we see a LocalVariableTable, 188 * then we ignore the parameter names from the LVT. 189 */ 190 boolean sawMethodParameters; 191 192 /** 193 * The set of attribute names for which warnings have been generated for the current class 194 */ 195 Set<Name> warnedAttrs = new HashSet<>(); 196 197 /** 198 * The prototype @Target Attribute.Compound if this class is an annotation annotated with 199 * @Target 200 */ 201 CompoundAnnotationProxy target; 202 203 /** 204 * The prototype @Repetable Attribute.Compound if this class is an annotation annotated with 205 * @Repeatable 206 */ 207 CompoundAnnotationProxy repeatable; 208 209 /** Get the ClassReader instance for this invocation. */ 210 public static ClassReader instance(Context context) { 211 ClassReader instance = context.get(classReaderKey); 212 if (instance == null) 213 instance = new ClassReader(context); 214 return instance; 215 } 216 217 /** Construct a new class reader. */ 218 protected ClassReader(Context context) { 219 context.put(classReaderKey, this); 220 annotate = Annotate.instance(context); 221 names = Names.instance(context); 222 syms = Symtab.instance(context); 223 types = Types.instance(context); 224 fileManager = context.get(JavaFileManager.class); 225 if (fileManager == null) 226 throw new AssertionError("FileManager initialization error"); 227 diagFactory = JCDiagnostic.Factory.instance(context); 228 229 log = Log.instance(context); 230 231 Options options = Options.instance(context); 232 verbose = options.isSet(VERBOSE); 233 checkClassFile = options.isSet("-checkclassfile"); 234 235 Source source = Source.instance(context); 236 allowSimplifiedVarargs = source.allowSimplifiedVarargs(); 237 238 saveParameterNames = options.isSet("save-parameter-names"); 239 240 profile = Profile.instance(context); 241 242 typevars = WriteableScope.create(syms.noSymbol); 243 244 lintClassfile = Lint.instance(context).isEnabled(LintCategory.CLASSFILE); 245 246 initAttributeReaders(); 247 } 248 249 /** Add member to class unless it is synthetic. 250 */ 251 private void enterMember(ClassSymbol c, Symbol sym) { 252 // Synthetic members are not entered -- reason lost to history (optimization?). 253 // Lambda methods must be entered because they may have inner classes (which reference them) 254 if ((sym.flags_field & (SYNTHETIC|BRIDGE)) != SYNTHETIC || sym.name.startsWith(names.lambda)) 255 c.members_field.enter(sym); 256 } 257 258/************************************************************************ 259 * Error Diagnoses 260 ***********************************************************************/ 261 262 public ClassFinder.BadClassFile badClassFile(String key, Object... args) { 263 return new ClassFinder.BadClassFile ( 264 currentOwner.enclClass(), 265 currentClassFile, 266 diagFactory.fragment(key, args), 267 diagFactory); 268 } 269 270/************************************************************************ 271 * Buffer Access 272 ***********************************************************************/ 273 274 /** Read a character. 275 */ 276 char nextChar() { 277 return (char)(((buf[bp++] & 0xFF) << 8) + (buf[bp++] & 0xFF)); 278 } 279 280 /** Read a byte. 281 */ 282 int nextByte() { 283 return buf[bp++] & 0xFF; 284 } 285 286 /** Read an integer. 287 */ 288 int nextInt() { 289 return 290 ((buf[bp++] & 0xFF) << 24) + 291 ((buf[bp++] & 0xFF) << 16) + 292 ((buf[bp++] & 0xFF) << 8) + 293 (buf[bp++] & 0xFF); 294 } 295 296 /** Extract a character at position bp from buf. 297 */ 298 char getChar(int bp) { 299 return 300 (char)(((buf[bp] & 0xFF) << 8) + (buf[bp+1] & 0xFF)); 301 } 302 303 /** Extract an integer at position bp from buf. 304 */ 305 int getInt(int bp) { 306 return 307 ((buf[bp] & 0xFF) << 24) + 308 ((buf[bp+1] & 0xFF) << 16) + 309 ((buf[bp+2] & 0xFF) << 8) + 310 (buf[bp+3] & 0xFF); 311 } 312 313 314 /** Extract a long integer at position bp from buf. 315 */ 316 long getLong(int bp) { 317 DataInputStream bufin = 318 new DataInputStream(new ByteArrayInputStream(buf, bp, 8)); 319 try { 320 return bufin.readLong(); 321 } catch (IOException e) { 322 throw new AssertionError(e); 323 } 324 } 325 326 /** Extract a float at position bp from buf. 327 */ 328 float getFloat(int bp) { 329 DataInputStream bufin = 330 new DataInputStream(new ByteArrayInputStream(buf, bp, 4)); 331 try { 332 return bufin.readFloat(); 333 } catch (IOException e) { 334 throw new AssertionError(e); 335 } 336 } 337 338 /** Extract a double at position bp from buf. 339 */ 340 double getDouble(int bp) { 341 DataInputStream bufin = 342 new DataInputStream(new ByteArrayInputStream(buf, bp, 8)); 343 try { 344 return bufin.readDouble(); 345 } catch (IOException e) { 346 throw new AssertionError(e); 347 } 348 } 349 350/************************************************************************ 351 * Constant Pool Access 352 ***********************************************************************/ 353 354 /** Index all constant pool entries, writing their start addresses into 355 * poolIdx. 356 */ 357 void indexPool() { 358 poolIdx = new int[nextChar()]; 359 poolObj = new Object[poolIdx.length]; 360 int i = 1; 361 while (i < poolIdx.length) { 362 poolIdx[i++] = bp; 363 byte tag = buf[bp++]; 364 switch (tag) { 365 case CONSTANT_Utf8: case CONSTANT_Unicode: { 366 int len = nextChar(); 367 bp = bp + len; 368 break; 369 } 370 case CONSTANT_Class: 371 case CONSTANT_String: 372 case CONSTANT_MethodType: 373 bp = bp + 2; 374 break; 375 case CONSTANT_MethodHandle: 376 bp = bp + 3; 377 break; 378 case CONSTANT_Fieldref: 379 case CONSTANT_Methodref: 380 case CONSTANT_InterfaceMethodref: 381 case CONSTANT_NameandType: 382 case CONSTANT_Integer: 383 case CONSTANT_Float: 384 case CONSTANT_InvokeDynamic: 385 bp = bp + 4; 386 break; 387 case CONSTANT_Long: 388 case CONSTANT_Double: 389 bp = bp + 8; 390 i++; 391 break; 392 default: 393 throw badClassFile("bad.const.pool.tag.at", 394 Byte.toString(tag), 395 Integer.toString(bp -1)); 396 } 397 } 398 } 399 400 /** Read constant pool entry at start address i, use pool as a cache. 401 */ 402 Object readPool(int i) { 403 Object result = poolObj[i]; 404 if (result != null) return result; 405 406 int index = poolIdx[i]; 407 if (index == 0) return null; 408 409 byte tag = buf[index]; 410 switch (tag) { 411 case CONSTANT_Utf8: 412 poolObj[i] = names.fromUtf(buf, index + 3, getChar(index + 1)); 413 break; 414 case CONSTANT_Unicode: 415 throw badClassFile("unicode.str.not.supported"); 416 case CONSTANT_Class: 417 poolObj[i] = readClassOrType(getChar(index + 1)); 418 break; 419 case CONSTANT_String: 420 // FIXME: (footprint) do not use toString here 421 poolObj[i] = readName(getChar(index + 1)).toString(); 422 break; 423 case CONSTANT_Fieldref: { 424 ClassSymbol owner = readClassSymbol(getChar(index + 1)); 425 NameAndType nt = readNameAndType(getChar(index + 3)); 426 poolObj[i] = new VarSymbol(0, nt.name, nt.uniqueType.type, owner); 427 break; 428 } 429 case CONSTANT_Methodref: 430 case CONSTANT_InterfaceMethodref: { 431 ClassSymbol owner = readClassSymbol(getChar(index + 1)); 432 NameAndType nt = readNameAndType(getChar(index + 3)); 433 poolObj[i] = new MethodSymbol(0, nt.name, nt.uniqueType.type, owner); 434 break; 435 } 436 case CONSTANT_NameandType: 437 poolObj[i] = new NameAndType( 438 readName(getChar(index + 1)), 439 readType(getChar(index + 3)), types); 440 break; 441 case CONSTANT_Integer: 442 poolObj[i] = getInt(index + 1); 443 break; 444 case CONSTANT_Float: 445 poolObj[i] = new Float(getFloat(index + 1)); 446 break; 447 case CONSTANT_Long: 448 poolObj[i] = new Long(getLong(index + 1)); 449 break; 450 case CONSTANT_Double: 451 poolObj[i] = new Double(getDouble(index + 1)); 452 break; 453 case CONSTANT_MethodHandle: 454 skipBytes(4); 455 break; 456 case CONSTANT_MethodType: 457 skipBytes(3); 458 break; 459 case CONSTANT_InvokeDynamic: 460 skipBytes(5); 461 break; 462 default: 463 throw badClassFile("bad.const.pool.tag", Byte.toString(tag)); 464 } 465 return poolObj[i]; 466 } 467 468 /** Read signature and convert to type. 469 */ 470 Type readType(int i) { 471 int index = poolIdx[i]; 472 return sigToType(buf, index + 3, getChar(index + 1)); 473 } 474 475 /** If name is an array type or class signature, return the 476 * corresponding type; otherwise return a ClassSymbol with given name. 477 */ 478 Object readClassOrType(int i) { 479 int index = poolIdx[i]; 480 int len = getChar(index + 1); 481 int start = index + 3; 482 Assert.check(buf[start] == '[' || buf[start + len - 1] != ';'); 483 // by the above assertion, the following test can be 484 // simplified to (buf[start] == '[') 485 return (buf[start] == '[' || buf[start + len - 1] == ';') 486 ? (Object)sigToType(buf, start, len) 487 : (Object)syms.enterClass(names.fromUtf(internalize(buf, start, 488 len))); 489 } 490 491 /** Read signature and convert to type parameters. 492 */ 493 List<Type> readTypeParams(int i) { 494 int index = poolIdx[i]; 495 return sigToTypeParams(buf, index + 3, getChar(index + 1)); 496 } 497 498 /** Read class entry. 499 */ 500 ClassSymbol readClassSymbol(int i) { 501 Object obj = readPool(i); 502 if (obj != null && !(obj instanceof ClassSymbol)) 503 throw badClassFile("bad.const.pool.entry", 504 currentClassFile.toString(), 505 "CONSTANT_Class_info", i); 506 return (ClassSymbol)obj; 507 } 508 509 /** Read name. 510 */ 511 Name readName(int i) { 512 Object obj = readPool(i); 513 if (obj != null && !(obj instanceof Name)) 514 throw badClassFile("bad.const.pool.entry", 515 currentClassFile.toString(), 516 "CONSTANT_Utf8_info or CONSTANT_String_info", i); 517 return (Name)obj; 518 } 519 520 /** Read name and type. 521 */ 522 NameAndType readNameAndType(int i) { 523 Object obj = readPool(i); 524 if (obj != null && !(obj instanceof NameAndType)) 525 throw badClassFile("bad.const.pool.entry", 526 currentClassFile.toString(), 527 "CONSTANT_NameAndType_info", i); 528 return (NameAndType)obj; 529 } 530 531/************************************************************************ 532 * Reading Types 533 ***********************************************************************/ 534 535 /** The unread portion of the currently read type is 536 * signature[sigp..siglimit-1]. 537 */ 538 byte[] signature; 539 int sigp; 540 int siglimit; 541 boolean sigEnterPhase = false; 542 543 /** Convert signature to type, where signature is a byte array segment. 544 */ 545 Type sigToType(byte[] sig, int offset, int len) { 546 signature = sig; 547 sigp = offset; 548 siglimit = offset + len; 549 return sigToType(); 550 } 551 552 /** Convert signature to type, where signature is implicit. 553 */ 554 Type sigToType() { 555 switch ((char) signature[sigp]) { 556 case 'T': 557 sigp++; 558 int start = sigp; 559 while (signature[sigp] != ';') sigp++; 560 sigp++; 561 return sigEnterPhase 562 ? Type.noType 563 : findTypeVar(names.fromUtf(signature, start, sigp - 1 - start)); 564 case '+': { 565 sigp++; 566 Type t = sigToType(); 567 return new WildcardType(t, BoundKind.EXTENDS, syms.boundClass); 568 } 569 case '*': 570 sigp++; 571 return new WildcardType(syms.objectType, BoundKind.UNBOUND, 572 syms.boundClass); 573 case '-': { 574 sigp++; 575 Type t = sigToType(); 576 return new WildcardType(t, BoundKind.SUPER, syms.boundClass); 577 } 578 case 'B': 579 sigp++; 580 return syms.byteType; 581 case 'C': 582 sigp++; 583 return syms.charType; 584 case 'D': 585 sigp++; 586 return syms.doubleType; 587 case 'F': 588 sigp++; 589 return syms.floatType; 590 case 'I': 591 sigp++; 592 return syms.intType; 593 case 'J': 594 sigp++; 595 return syms.longType; 596 case 'L': 597 { 598 // int oldsigp = sigp; 599 Type t = classSigToType(); 600 if (sigp < siglimit && signature[sigp] == '.') 601 throw badClassFile("deprecated inner class signature syntax " + 602 "(please recompile from source)"); 603 /* 604 System.err.println(" decoded " + 605 new String(signature, oldsigp, sigp-oldsigp) + 606 " => " + t + " outer " + t.outer()); 607 */ 608 return t; 609 } 610 case 'S': 611 sigp++; 612 return syms.shortType; 613 case 'V': 614 sigp++; 615 return syms.voidType; 616 case 'Z': 617 sigp++; 618 return syms.booleanType; 619 case '[': 620 sigp++; 621 return new ArrayType(sigToType(), syms.arrayClass); 622 case '(': 623 sigp++; 624 List<Type> argtypes = sigToTypes(')'); 625 Type restype = sigToType(); 626 List<Type> thrown = List.nil(); 627 while (signature[sigp] == '^') { 628 sigp++; 629 thrown = thrown.prepend(sigToType()); 630 } 631 // if there is a typevar in the throws clause we should state it. 632 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail) { 633 if (l.head.hasTag(TYPEVAR)) { 634 l.head.tsym.flags_field |= THROWS; 635 } 636 } 637 return new MethodType(argtypes, 638 restype, 639 thrown.reverse(), 640 syms.methodClass); 641 case '<': 642 typevars = typevars.dup(currentOwner); 643 Type poly = new ForAll(sigToTypeParams(), sigToType()); 644 typevars = typevars.leave(); 645 return poly; 646 default: 647 throw badClassFile("bad.signature", 648 Convert.utf2string(signature, sigp, 10)); 649 } 650 } 651 652 byte[] signatureBuffer = new byte[0]; 653 int sbp = 0; 654 /** Convert class signature to type, where signature is implicit. 655 */ 656 Type classSigToType() { 657 if (signature[sigp] != 'L') 658 throw badClassFile("bad.class.signature", 659 Convert.utf2string(signature, sigp, 10)); 660 sigp++; 661 Type outer = Type.noType; 662 int startSbp = sbp; 663 664 while (true) { 665 final byte c = signature[sigp++]; 666 switch (c) { 667 668 case ';': { // end 669 ClassSymbol t = syms.enterClass(names.fromUtf(signatureBuffer, 670 startSbp, 671 sbp - startSbp)); 672 673 try { 674 return (outer == Type.noType) ? 675 t.erasure(types) : 676 new ClassType(outer, List.<Type>nil(), t); 677 } finally { 678 sbp = startSbp; 679 } 680 } 681 682 case '<': // generic arguments 683 ClassSymbol t = syms.enterClass(names.fromUtf(signatureBuffer, 684 startSbp, 685 sbp - startSbp)); 686 outer = new ClassType(outer, sigToTypes('>'), t) { 687 boolean completed = false; 688 @Override @DefinedBy(Api.LANGUAGE_MODEL) 689 public Type getEnclosingType() { 690 if (!completed) { 691 completed = true; 692 tsym.complete(); 693 Type enclosingType = tsym.type.getEnclosingType(); 694 if (enclosingType != Type.noType) { 695 List<Type> typeArgs = 696 super.getEnclosingType().allparams(); 697 List<Type> typeParams = 698 enclosingType.allparams(); 699 if (typeParams.length() != typeArgs.length()) { 700 // no "rare" types 701 super.setEnclosingType(types.erasure(enclosingType)); 702 } else { 703 super.setEnclosingType(types.subst(enclosingType, 704 typeParams, 705 typeArgs)); 706 } 707 } else { 708 super.setEnclosingType(Type.noType); 709 } 710 } 711 return super.getEnclosingType(); 712 } 713 @Override 714 public void setEnclosingType(Type outer) { 715 throw new UnsupportedOperationException(); 716 } 717 }; 718 switch (signature[sigp++]) { 719 case ';': 720 if (sigp < signature.length && signature[sigp] == '.') { 721 // support old-style GJC signatures 722 // The signature produced was 723 // Lfoo/Outer<Lfoo/X;>;.Lfoo/Outer$Inner<Lfoo/Y;>; 724 // rather than say 725 // Lfoo/Outer<Lfoo/X;>.Inner<Lfoo/Y;>; 726 // so we skip past ".Lfoo/Outer$" 727 sigp += (sbp - startSbp) + // "foo/Outer" 728 3; // ".L" and "$" 729 signatureBuffer[sbp++] = (byte)'$'; 730 break; 731 } else { 732 sbp = startSbp; 733 return outer; 734 } 735 case '.': 736 signatureBuffer[sbp++] = (byte)'$'; 737 break; 738 default: 739 throw new AssertionError(signature[sigp-1]); 740 } 741 continue; 742 743 case '.': 744 //we have seen an enclosing non-generic class 745 if (outer != Type.noType) { 746 t = syms.enterClass(names.fromUtf(signatureBuffer, 747 startSbp, 748 sbp - startSbp)); 749 outer = new ClassType(outer, List.<Type>nil(), t); 750 } 751 signatureBuffer[sbp++] = (byte)'$'; 752 continue; 753 case '/': 754 signatureBuffer[sbp++] = (byte)'.'; 755 continue; 756 default: 757 signatureBuffer[sbp++] = c; 758 continue; 759 } 760 } 761 } 762 763 /** Convert (implicit) signature to list of types 764 * until `terminator' is encountered. 765 */ 766 List<Type> sigToTypes(char terminator) { 767 List<Type> head = List.of(null); 768 List<Type> tail = head; 769 while (signature[sigp] != terminator) 770 tail = tail.setTail(List.of(sigToType())); 771 sigp++; 772 return head.tail; 773 } 774 775 /** Convert signature to type parameters, where signature is a byte 776 * array segment. 777 */ 778 List<Type> sigToTypeParams(byte[] sig, int offset, int len) { 779 signature = sig; 780 sigp = offset; 781 siglimit = offset + len; 782 return sigToTypeParams(); 783 } 784 785 /** Convert signature to type parameters, where signature is implicit. 786 */ 787 List<Type> sigToTypeParams() { 788 List<Type> tvars = List.nil(); 789 if (signature[sigp] == '<') { 790 sigp++; 791 int start = sigp; 792 sigEnterPhase = true; 793 while (signature[sigp] != '>') 794 tvars = tvars.prepend(sigToTypeParam()); 795 sigEnterPhase = false; 796 sigp = start; 797 while (signature[sigp] != '>') 798 sigToTypeParam(); 799 sigp++; 800 } 801 return tvars.reverse(); 802 } 803 804 /** Convert (implicit) signature to type parameter. 805 */ 806 Type sigToTypeParam() { 807 int start = sigp; 808 while (signature[sigp] != ':') sigp++; 809 Name name = names.fromUtf(signature, start, sigp - start); 810 TypeVar tvar; 811 if (sigEnterPhase) { 812 tvar = new TypeVar(name, currentOwner, syms.botType); 813 typevars.enter(tvar.tsym); 814 } else { 815 tvar = (TypeVar)findTypeVar(name); 816 } 817 List<Type> bounds = List.nil(); 818 boolean allInterfaces = false; 819 if (signature[sigp] == ':' && signature[sigp+1] == ':') { 820 sigp++; 821 allInterfaces = true; 822 } 823 while (signature[sigp] == ':') { 824 sigp++; 825 bounds = bounds.prepend(sigToType()); 826 } 827 if (!sigEnterPhase) { 828 types.setBounds(tvar, bounds.reverse(), allInterfaces); 829 } 830 return tvar; 831 } 832 833 /** Find type variable with given name in `typevars' scope. 834 */ 835 Type findTypeVar(Name name) { 836 Symbol s = typevars.findFirst(name); 837 if (s != null) { 838 return s.type; 839 } else { 840 if (readingClassAttr) { 841 // While reading the class attribute, the supertypes 842 // might refer to a type variable from an enclosing element 843 // (method or class). 844 // If the type variable is defined in the enclosing class, 845 // we can actually find it in 846 // currentOwner.owner.type.getTypeArguments() 847 // However, until we have read the enclosing method attribute 848 // we don't know for sure if this owner is correct. It could 849 // be a method and there is no way to tell before reading the 850 // enclosing method attribute. 851 TypeVar t = new TypeVar(name, currentOwner, syms.botType); 852 missingTypeVariables = missingTypeVariables.prepend(t); 853 // System.err.println("Missing type var " + name); 854 return t; 855 } 856 throw badClassFile("undecl.type.var", name); 857 } 858 } 859 860/************************************************************************ 861 * Reading Attributes 862 ***********************************************************************/ 863 864 protected enum AttributeKind { CLASS, MEMBER } 865 866 protected abstract class AttributeReader { 867 protected AttributeReader(Name name, ClassFile.Version version, Set<AttributeKind> kinds) { 868 this.name = name; 869 this.version = version; 870 this.kinds = kinds; 871 } 872 873 protected boolean accepts(AttributeKind kind) { 874 if (kinds.contains(kind)) { 875 if (majorVersion > version.major || (majorVersion == version.major && minorVersion >= version.minor)) 876 return true; 877 878 if (lintClassfile && !warnedAttrs.contains(name)) { 879 JavaFileObject prev = log.useSource(currentClassFile); 880 try { 881 log.warning(LintCategory.CLASSFILE, (DiagnosticPosition) null, "future.attr", 882 name, version.major, version.minor, majorVersion, minorVersion); 883 } finally { 884 log.useSource(prev); 885 } 886 warnedAttrs.add(name); 887 } 888 } 889 return false; 890 } 891 892 protected abstract void read(Symbol sym, int attrLen); 893 894 protected final Name name; 895 protected final ClassFile.Version version; 896 protected final Set<AttributeKind> kinds; 897 } 898 899 protected Set<AttributeKind> CLASS_ATTRIBUTE = 900 EnumSet.of(AttributeKind.CLASS); 901 protected Set<AttributeKind> MEMBER_ATTRIBUTE = 902 EnumSet.of(AttributeKind.MEMBER); 903 protected Set<AttributeKind> CLASS_OR_MEMBER_ATTRIBUTE = 904 EnumSet.of(AttributeKind.CLASS, AttributeKind.MEMBER); 905 906 protected Map<Name, AttributeReader> attributeReaders = new HashMap<>(); 907 908 private void initAttributeReaders() { 909 AttributeReader[] readers = { 910 // v45.3 attributes 911 912 new AttributeReader(names.Code, V45_3, MEMBER_ATTRIBUTE) { 913 protected void read(Symbol sym, int attrLen) { 914 if (readAllOfClassFile || saveParameterNames) 915 ((MethodSymbol)sym).code = readCode(sym); 916 else 917 bp = bp + attrLen; 918 } 919 }, 920 921 new AttributeReader(names.ConstantValue, V45_3, MEMBER_ATTRIBUTE) { 922 protected void read(Symbol sym, int attrLen) { 923 Object v = readPool(nextChar()); 924 // Ignore ConstantValue attribute if field not final. 925 if ((sym.flags() & FINAL) != 0) 926 ((VarSymbol) sym).setData(v); 927 } 928 }, 929 930 new AttributeReader(names.Deprecated, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) { 931 protected void read(Symbol sym, int attrLen) { 932 sym.flags_field |= DEPRECATED; 933 } 934 }, 935 936 new AttributeReader(names.Exceptions, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) { 937 protected void read(Symbol sym, int attrLen) { 938 int nexceptions = nextChar(); 939 List<Type> thrown = List.nil(); 940 for (int j = 0; j < nexceptions; j++) 941 thrown = thrown.prepend(readClassSymbol(nextChar()).type); 942 if (sym.type.getThrownTypes().isEmpty()) 943 sym.type.asMethodType().thrown = thrown.reverse(); 944 } 945 }, 946 947 new AttributeReader(names.InnerClasses, V45_3, CLASS_ATTRIBUTE) { 948 protected void read(Symbol sym, int attrLen) { 949 ClassSymbol c = (ClassSymbol) sym; 950 readInnerClasses(c); 951 } 952 }, 953 954 new AttributeReader(names.LocalVariableTable, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) { 955 protected void read(Symbol sym, int attrLen) { 956 int newbp = bp + attrLen; 957 if (saveParameterNames && !sawMethodParameters) { 958 // Pick up parameter names from the variable table. 959 // Parameter names are not explicitly identified as such, 960 // but all parameter name entries in the LocalVariableTable 961 // have a start_pc of 0. Therefore, we record the name 962 // indicies of all slots with a start_pc of zero in the 963 // parameterNameIndicies array. 964 // Note that this implicitly honors the JVMS spec that 965 // there may be more than one LocalVariableTable, and that 966 // there is no specified ordering for the entries. 967 int numEntries = nextChar(); 968 for (int i = 0; i < numEntries; i++) { 969 int start_pc = nextChar(); 970 int length = nextChar(); 971 int nameIndex = nextChar(); 972 int sigIndex = nextChar(); 973 int register = nextChar(); 974 if (start_pc == 0) { 975 // ensure array large enough 976 if (register >= parameterNameIndices.length) { 977 int newSize = Math.max(register, parameterNameIndices.length + 8); 978 parameterNameIndices = 979 Arrays.copyOf(parameterNameIndices, newSize); 980 } 981 parameterNameIndices[register] = nameIndex; 982 haveParameterNameIndices = true; 983 } 984 } 985 } 986 bp = newbp; 987 } 988 }, 989 990 new AttributeReader(names.MethodParameters, V52, MEMBER_ATTRIBUTE) { 991 protected void read(Symbol sym, int attrlen) { 992 int newbp = bp + attrlen; 993 if (saveParameterNames) { 994 sawMethodParameters = true; 995 int numEntries = nextByte(); 996 parameterNameIndices = new int[numEntries]; 997 haveParameterNameIndices = true; 998 for (int i = 0; i < numEntries; i++) { 999 int nameIndex = nextChar(); 1000 int flags = nextChar(); 1001 parameterNameIndices[i] = nameIndex; 1002 } 1003 } 1004 bp = newbp; 1005 } 1006 }, 1007 1008 1009 new AttributeReader(names.SourceFile, V45_3, CLASS_ATTRIBUTE) { 1010 protected void read(Symbol sym, int attrLen) { 1011 ClassSymbol c = (ClassSymbol) sym; 1012 Name n = readName(nextChar()); 1013 c.sourcefile = new SourceFileObject(n, c.flatname); 1014 // If the class is a toplevel class, originating from a Java source file, 1015 // but the class name does not match the file name, then it is 1016 // an auxiliary class. 1017 String sn = n.toString(); 1018 if (c.owner.kind == PCK && 1019 sn.endsWith(".java") && 1020 !sn.equals(c.name.toString()+".java")) { 1021 c.flags_field |= AUXILIARY; 1022 } 1023 } 1024 }, 1025 1026 new AttributeReader(names.Synthetic, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) { 1027 protected void read(Symbol sym, int attrLen) { 1028 sym.flags_field |= SYNTHETIC; 1029 } 1030 }, 1031 1032 // standard v49 attributes 1033 1034 new AttributeReader(names.EnclosingMethod, V49, CLASS_ATTRIBUTE) { 1035 protected void read(Symbol sym, int attrLen) { 1036 int newbp = bp + attrLen; 1037 readEnclosingMethodAttr(sym); 1038 bp = newbp; 1039 } 1040 }, 1041 1042 new AttributeReader(names.Signature, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1043 protected void read(Symbol sym, int attrLen) { 1044 if (sym.kind == TYP) { 1045 ClassSymbol c = (ClassSymbol) sym; 1046 readingClassAttr = true; 1047 try { 1048 ClassType ct1 = (ClassType)c.type; 1049 Assert.check(c == currentOwner); 1050 ct1.typarams_field = readTypeParams(nextChar()); 1051 ct1.supertype_field = sigToType(); 1052 ListBuffer<Type> is = new ListBuffer<>(); 1053 while (sigp != siglimit) is.append(sigToType()); 1054 ct1.interfaces_field = is.toList(); 1055 } finally { 1056 readingClassAttr = false; 1057 } 1058 } else { 1059 List<Type> thrown = sym.type.getThrownTypes(); 1060 sym.type = readType(nextChar()); 1061 //- System.err.println(" # " + sym.type); 1062 if (sym.kind == MTH && sym.type.getThrownTypes().isEmpty()) 1063 sym.type.asMethodType().thrown = thrown; 1064 1065 } 1066 } 1067 }, 1068 1069 // v49 annotation attributes 1070 1071 new AttributeReader(names.AnnotationDefault, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1072 protected void read(Symbol sym, int attrLen) { 1073 attachAnnotationDefault(sym); 1074 } 1075 }, 1076 1077 new AttributeReader(names.RuntimeInvisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1078 protected void read(Symbol sym, int attrLen) { 1079 attachAnnotations(sym); 1080 } 1081 }, 1082 1083 new AttributeReader(names.RuntimeInvisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1084 protected void read(Symbol sym, int attrLen) { 1085 attachParameterAnnotations(sym); 1086 } 1087 }, 1088 1089 new AttributeReader(names.RuntimeVisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1090 protected void read(Symbol sym, int attrLen) { 1091 attachAnnotations(sym); 1092 } 1093 }, 1094 1095 new AttributeReader(names.RuntimeVisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1096 protected void read(Symbol sym, int attrLen) { 1097 attachParameterAnnotations(sym); 1098 } 1099 }, 1100 1101 // additional "legacy" v49 attributes, superceded by flags 1102 1103 new AttributeReader(names.Annotation, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1104 protected void read(Symbol sym, int attrLen) { 1105 sym.flags_field |= ANNOTATION; 1106 } 1107 }, 1108 1109 new AttributeReader(names.Bridge, V49, MEMBER_ATTRIBUTE) { 1110 protected void read(Symbol sym, int attrLen) { 1111 sym.flags_field |= BRIDGE; 1112 } 1113 }, 1114 1115 new AttributeReader(names.Enum, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1116 protected void read(Symbol sym, int attrLen) { 1117 sym.flags_field |= ENUM; 1118 } 1119 }, 1120 1121 new AttributeReader(names.Varargs, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1122 protected void read(Symbol sym, int attrLen) { 1123 sym.flags_field |= VARARGS; 1124 } 1125 }, 1126 1127 new AttributeReader(names.RuntimeVisibleTypeAnnotations, V52, CLASS_OR_MEMBER_ATTRIBUTE) { 1128 protected void read(Symbol sym, int attrLen) { 1129 attachTypeAnnotations(sym); 1130 } 1131 }, 1132 1133 new AttributeReader(names.RuntimeInvisibleTypeAnnotations, V52, CLASS_OR_MEMBER_ATTRIBUTE) { 1134 protected void read(Symbol sym, int attrLen) { 1135 attachTypeAnnotations(sym); 1136 } 1137 }, 1138 1139 1140 // The following attributes for a Code attribute are not currently handled 1141 // StackMapTable 1142 // SourceDebugExtension 1143 // LineNumberTable 1144 // LocalVariableTypeTable 1145 }; 1146 1147 for (AttributeReader r: readers) 1148 attributeReaders.put(r.name, r); 1149 } 1150 1151 /** Report unrecognized attribute. 1152 */ 1153 void unrecognized(Name attrName) { 1154 if (checkClassFile) 1155 printCCF("ccf.unrecognized.attribute", attrName); 1156 } 1157 1158 1159 1160 protected void readEnclosingMethodAttr(Symbol sym) { 1161 // sym is a nested class with an "Enclosing Method" attribute 1162 // remove sym from it's current owners scope and place it in 1163 // the scope specified by the attribute 1164 sym.owner.members().remove(sym); 1165 ClassSymbol self = (ClassSymbol)sym; 1166 ClassSymbol c = readClassSymbol(nextChar()); 1167 NameAndType nt = readNameAndType(nextChar()); 1168 1169 if (c.members_field == null) 1170 throw badClassFile("bad.enclosing.class", self, c); 1171 1172 MethodSymbol m = findMethod(nt, c.members_field, self.flags()); 1173 if (nt != null && m == null) 1174 throw badClassFile("bad.enclosing.method", self); 1175 1176 self.name = simpleBinaryName(self.flatname, c.flatname) ; 1177 self.owner = m != null ? m : c; 1178 if (self.name.isEmpty()) 1179 self.fullname = names.empty; 1180 else 1181 self.fullname = ClassSymbol.formFullName(self.name, self.owner); 1182 1183 if (m != null) { 1184 ((ClassType)sym.type).setEnclosingType(m.type); 1185 } else if ((self.flags_field & STATIC) == 0) { 1186 ((ClassType)sym.type).setEnclosingType(c.type); 1187 } else { 1188 ((ClassType)sym.type).setEnclosingType(Type.noType); 1189 } 1190 enterTypevars(self); 1191 if (!missingTypeVariables.isEmpty()) { 1192 ListBuffer<Type> typeVars = new ListBuffer<>(); 1193 for (Type typevar : missingTypeVariables) { 1194 typeVars.append(findTypeVar(typevar.tsym.name)); 1195 } 1196 foundTypeVariables = typeVars.toList(); 1197 } else { 1198 foundTypeVariables = List.nil(); 1199 } 1200 } 1201 1202 // See java.lang.Class 1203 private Name simpleBinaryName(Name self, Name enclosing) { 1204 String simpleBinaryName = self.toString().substring(enclosing.toString().length()); 1205 if (simpleBinaryName.length() < 1 || simpleBinaryName.charAt(0) != '$') 1206 throw badClassFile("bad.enclosing.method", self); 1207 int index = 1; 1208 while (index < simpleBinaryName.length() && 1209 isAsciiDigit(simpleBinaryName.charAt(index))) 1210 index++; 1211 return names.fromString(simpleBinaryName.substring(index)); 1212 } 1213 1214 private MethodSymbol findMethod(NameAndType nt, Scope scope, long flags) { 1215 if (nt == null) 1216 return null; 1217 1218 MethodType type = nt.uniqueType.type.asMethodType(); 1219 1220 for (Symbol sym : scope.getSymbolsByName(nt.name)) { 1221 if (sym.kind == MTH && isSameBinaryType(sym.type.asMethodType(), type)) 1222 return (MethodSymbol)sym; 1223 } 1224 1225 if (nt.name != names.init) 1226 // not a constructor 1227 return null; 1228 if ((flags & INTERFACE) != 0) 1229 // no enclosing instance 1230 return null; 1231 if (nt.uniqueType.type.getParameterTypes().isEmpty()) 1232 // no parameters 1233 return null; 1234 1235 // A constructor of an inner class. 1236 // Remove the first argument (the enclosing instance) 1237 nt.setType(new MethodType(nt.uniqueType.type.getParameterTypes().tail, 1238 nt.uniqueType.type.getReturnType(), 1239 nt.uniqueType.type.getThrownTypes(), 1240 syms.methodClass)); 1241 // Try searching again 1242 return findMethod(nt, scope, flags); 1243 } 1244 1245 /** Similar to Types.isSameType but avoids completion */ 1246 private boolean isSameBinaryType(MethodType mt1, MethodType mt2) { 1247 List<Type> types1 = types.erasure(mt1.getParameterTypes()) 1248 .prepend(types.erasure(mt1.getReturnType())); 1249 List<Type> types2 = mt2.getParameterTypes().prepend(mt2.getReturnType()); 1250 while (!types1.isEmpty() && !types2.isEmpty()) { 1251 if (types1.head.tsym != types2.head.tsym) 1252 return false; 1253 types1 = types1.tail; 1254 types2 = types2.tail; 1255 } 1256 return types1.isEmpty() && types2.isEmpty(); 1257 } 1258 1259 /** 1260 * Character.isDigit answers <tt>true</tt> to some non-ascii 1261 * digits. This one does not. <b>copied from java.lang.Class</b> 1262 */ 1263 private static boolean isAsciiDigit(char c) { 1264 return '0' <= c && c <= '9'; 1265 } 1266 1267 /** Read member attributes. 1268 */ 1269 void readMemberAttrs(Symbol sym) { 1270 readAttrs(sym, AttributeKind.MEMBER); 1271 } 1272 1273 void readAttrs(Symbol sym, AttributeKind kind) { 1274 char ac = nextChar(); 1275 for (int i = 0; i < ac; i++) { 1276 Name attrName = readName(nextChar()); 1277 int attrLen = nextInt(); 1278 AttributeReader r = attributeReaders.get(attrName); 1279 if (r != null && r.accepts(kind)) 1280 r.read(sym, attrLen); 1281 else { 1282 unrecognized(attrName); 1283 bp = bp + attrLen; 1284 } 1285 } 1286 } 1287 1288 private boolean readingClassAttr = false; 1289 private List<Type> missingTypeVariables = List.nil(); 1290 private List<Type> foundTypeVariables = List.nil(); 1291 1292 /** Read class attributes. 1293 */ 1294 void readClassAttrs(ClassSymbol c) { 1295 readAttrs(c, AttributeKind.CLASS); 1296 } 1297 1298 /** Read code block. 1299 */ 1300 Code readCode(Symbol owner) { 1301 nextChar(); // max_stack 1302 nextChar(); // max_locals 1303 final int code_length = nextInt(); 1304 bp += code_length; 1305 final char exception_table_length = nextChar(); 1306 bp += exception_table_length * 8; 1307 readMemberAttrs(owner); 1308 return null; 1309 } 1310 1311/************************************************************************ 1312 * Reading Java-language annotations 1313 ***********************************************************************/ 1314 1315 /** Attach annotations. 1316 */ 1317 void attachAnnotations(final Symbol sym) { 1318 int numAttributes = nextChar(); 1319 if (numAttributes != 0) { 1320 ListBuffer<CompoundAnnotationProxy> proxies = new ListBuffer<>(); 1321 for (int i = 0; i<numAttributes; i++) { 1322 CompoundAnnotationProxy proxy = readCompoundAnnotation(); 1323 1324 if (proxy.type.tsym == syms.proprietaryType.tsym) 1325 sym.flags_field |= PROPRIETARY; 1326 else if (proxy.type.tsym == syms.profileType.tsym) { 1327 if (profile != Profile.DEFAULT) { 1328 for (Pair<Name,Attribute> v: proxy.values) { 1329 if (v.fst == names.value && v.snd instanceof Attribute.Constant) { 1330 Attribute.Constant c = (Attribute.Constant) v.snd; 1331 if (c.type == syms.intType && ((Integer) c.value) > profile.value) { 1332 sym.flags_field |= NOT_IN_PROFILE; 1333 } 1334 } 1335 } 1336 } 1337 } else { 1338 if (proxy.type.tsym == syms.annotationTargetType.tsym) { 1339 target = proxy; 1340 } else if (proxy.type.tsym == syms.repeatableType.tsym) { 1341 repeatable = proxy; 1342 } 1343 1344 proxies.append(proxy); 1345 } 1346 } 1347 annotate.normal(new AnnotationCompleter(sym, proxies.toList())); 1348 } 1349 } 1350 1351 /** Attach parameter annotations. 1352 */ 1353 void attachParameterAnnotations(final Symbol method) { 1354 final MethodSymbol meth = (MethodSymbol)method; 1355 int numParameters = buf[bp++] & 0xFF; 1356 List<VarSymbol> parameters = meth.params(); 1357 int pnum = 0; 1358 while (parameters.tail != null) { 1359 attachAnnotations(parameters.head); 1360 parameters = parameters.tail; 1361 pnum++; 1362 } 1363 if (pnum != numParameters) { 1364 throw badClassFile("bad.runtime.invisible.param.annotations", meth); 1365 } 1366 } 1367 1368 void attachTypeAnnotations(final Symbol sym) { 1369 int numAttributes = nextChar(); 1370 if (numAttributes != 0) { 1371 ListBuffer<TypeAnnotationProxy> proxies = new ListBuffer<>(); 1372 for (int i = 0; i < numAttributes; i++) 1373 proxies.append(readTypeAnnotation()); 1374 annotate.normal(new TypeAnnotationCompleter(sym, proxies.toList())); 1375 } 1376 } 1377 1378 /** Attach the default value for an annotation element. 1379 */ 1380 void attachAnnotationDefault(final Symbol sym) { 1381 final MethodSymbol meth = (MethodSymbol)sym; // only on methods 1382 final Attribute value = readAttributeValue(); 1383 1384 // The default value is set later during annotation. It might 1385 // be the case that the Symbol sym is annotated _after_ the 1386 // repeating instances that depend on this default value, 1387 // because of this we set an interim value that tells us this 1388 // element (most likely) has a default. 1389 // 1390 // Set interim value for now, reset just before we do this 1391 // properly at annotate time. 1392 meth.defaultValue = value; 1393 annotate.normal(new AnnotationDefaultCompleter(meth, value)); 1394 } 1395 1396 Type readTypeOrClassSymbol(int i) { 1397 // support preliminary jsr175-format class files 1398 if (buf[poolIdx[i]] == CONSTANT_Class) 1399 return readClassSymbol(i).type; 1400 return readType(i); 1401 } 1402 Type readEnumType(int i) { 1403 // support preliminary jsr175-format class files 1404 int index = poolIdx[i]; 1405 int length = getChar(index + 1); 1406 if (buf[index + length + 2] != ';') 1407 return syms.enterClass(readName(i)).type; 1408 return readType(i); 1409 } 1410 1411 CompoundAnnotationProxy readCompoundAnnotation() { 1412 Type t = readTypeOrClassSymbol(nextChar()); 1413 int numFields = nextChar(); 1414 ListBuffer<Pair<Name,Attribute>> pairs = new ListBuffer<>(); 1415 for (int i=0; i<numFields; i++) { 1416 Name name = readName(nextChar()); 1417 Attribute value = readAttributeValue(); 1418 pairs.append(new Pair<>(name, value)); 1419 } 1420 return new CompoundAnnotationProxy(t, pairs.toList()); 1421 } 1422 1423 TypeAnnotationProxy readTypeAnnotation() { 1424 TypeAnnotationPosition position = readPosition(); 1425 CompoundAnnotationProxy proxy = readCompoundAnnotation(); 1426 1427 return new TypeAnnotationProxy(proxy, position); 1428 } 1429 1430 TypeAnnotationPosition readPosition() { 1431 int tag = nextByte(); // TargetType tag is a byte 1432 1433 if (!TargetType.isValidTargetTypeValue(tag)) 1434 throw badClassFile("bad.type.annotation.value", String.format("0x%02X", tag)); 1435 1436 TargetType type = TargetType.fromTargetTypeValue(tag); 1437 1438 switch (type) { 1439 // instanceof 1440 case INSTANCEOF: { 1441 final int offset = nextChar(); 1442 final TypeAnnotationPosition position = 1443 TypeAnnotationPosition.instanceOf(readTypePath()); 1444 position.offset = offset; 1445 return position; 1446 } 1447 // new expression 1448 case NEW: { 1449 final int offset = nextChar(); 1450 final TypeAnnotationPosition position = 1451 TypeAnnotationPosition.newObj(readTypePath()); 1452 position.offset = offset; 1453 return position; 1454 } 1455 // constructor/method reference receiver 1456 case CONSTRUCTOR_REFERENCE: { 1457 final int offset = nextChar(); 1458 final TypeAnnotationPosition position = 1459 TypeAnnotationPosition.constructorRef(readTypePath()); 1460 position.offset = offset; 1461 return position; 1462 } 1463 case METHOD_REFERENCE: { 1464 final int offset = nextChar(); 1465 final TypeAnnotationPosition position = 1466 TypeAnnotationPosition.methodRef(readTypePath()); 1467 position.offset = offset; 1468 return position; 1469 } 1470 // local variable 1471 case LOCAL_VARIABLE: { 1472 final int table_length = nextChar(); 1473 final int[] newLvarOffset = new int[table_length]; 1474 final int[] newLvarLength = new int[table_length]; 1475 final int[] newLvarIndex = new int[table_length]; 1476 1477 for (int i = 0; i < table_length; ++i) { 1478 newLvarOffset[i] = nextChar(); 1479 newLvarLength[i] = nextChar(); 1480 newLvarIndex[i] = nextChar(); 1481 } 1482 1483 final TypeAnnotationPosition position = 1484 TypeAnnotationPosition.localVariable(readTypePath()); 1485 position.lvarOffset = newLvarOffset; 1486 position.lvarLength = newLvarLength; 1487 position.lvarIndex = newLvarIndex; 1488 return position; 1489 } 1490 // resource variable 1491 case RESOURCE_VARIABLE: { 1492 final int table_length = nextChar(); 1493 final int[] newLvarOffset = new int[table_length]; 1494 final int[] newLvarLength = new int[table_length]; 1495 final int[] newLvarIndex = new int[table_length]; 1496 1497 for (int i = 0; i < table_length; ++i) { 1498 newLvarOffset[i] = nextChar(); 1499 newLvarLength[i] = nextChar(); 1500 newLvarIndex[i] = nextChar(); 1501 } 1502 1503 final TypeAnnotationPosition position = 1504 TypeAnnotationPosition.resourceVariable(readTypePath()); 1505 position.lvarOffset = newLvarOffset; 1506 position.lvarLength = newLvarLength; 1507 position.lvarIndex = newLvarIndex; 1508 return position; 1509 } 1510 // exception parameter 1511 case EXCEPTION_PARAMETER: { 1512 final int exception_index = nextChar(); 1513 final TypeAnnotationPosition position = 1514 TypeAnnotationPosition.exceptionParameter(readTypePath()); 1515 position.setExceptionIndex(exception_index); 1516 return position; 1517 } 1518 // method receiver 1519 case METHOD_RECEIVER: 1520 return TypeAnnotationPosition.methodReceiver(readTypePath()); 1521 // type parameter 1522 case CLASS_TYPE_PARAMETER: { 1523 final int parameter_index = nextByte(); 1524 return TypeAnnotationPosition 1525 .typeParameter(readTypePath(), parameter_index); 1526 } 1527 case METHOD_TYPE_PARAMETER: { 1528 final int parameter_index = nextByte(); 1529 return TypeAnnotationPosition 1530 .methodTypeParameter(readTypePath(), parameter_index); 1531 } 1532 // type parameter bound 1533 case CLASS_TYPE_PARAMETER_BOUND: { 1534 final int parameter_index = nextByte(); 1535 final int bound_index = nextByte(); 1536 return TypeAnnotationPosition 1537 .typeParameterBound(readTypePath(), parameter_index, 1538 bound_index); 1539 } 1540 case METHOD_TYPE_PARAMETER_BOUND: { 1541 final int parameter_index = nextByte(); 1542 final int bound_index = nextByte(); 1543 return TypeAnnotationPosition 1544 .methodTypeParameterBound(readTypePath(), parameter_index, 1545 bound_index); 1546 } 1547 // class extends or implements clause 1548 case CLASS_EXTENDS: { 1549 final int type_index = nextChar(); 1550 return TypeAnnotationPosition.classExtends(readTypePath(), 1551 type_index); 1552 } 1553 // throws 1554 case THROWS: { 1555 final int type_index = nextChar(); 1556 return TypeAnnotationPosition.methodThrows(readTypePath(), 1557 type_index); 1558 } 1559 // method parameter 1560 case METHOD_FORMAL_PARAMETER: { 1561 final int parameter_index = nextByte(); 1562 return TypeAnnotationPosition.methodParameter(readTypePath(), 1563 parameter_index); 1564 } 1565 // type cast 1566 case CAST: { 1567 final int offset = nextChar(); 1568 final int type_index = nextByte(); 1569 final TypeAnnotationPosition position = 1570 TypeAnnotationPosition.typeCast(readTypePath(), type_index); 1571 position.offset = offset; 1572 return position; 1573 } 1574 // method/constructor/reference type argument 1575 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT: { 1576 final int offset = nextChar(); 1577 final int type_index = nextByte(); 1578 final TypeAnnotationPosition position = TypeAnnotationPosition 1579 .constructorInvocationTypeArg(readTypePath(), type_index); 1580 position.offset = offset; 1581 return position; 1582 } 1583 case METHOD_INVOCATION_TYPE_ARGUMENT: { 1584 final int offset = nextChar(); 1585 final int type_index = nextByte(); 1586 final TypeAnnotationPosition position = TypeAnnotationPosition 1587 .methodInvocationTypeArg(readTypePath(), type_index); 1588 position.offset = offset; 1589 return position; 1590 } 1591 case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT: { 1592 final int offset = nextChar(); 1593 final int type_index = nextByte(); 1594 final TypeAnnotationPosition position = TypeAnnotationPosition 1595 .constructorRefTypeArg(readTypePath(), type_index); 1596 position.offset = offset; 1597 return position; 1598 } 1599 case METHOD_REFERENCE_TYPE_ARGUMENT: { 1600 final int offset = nextChar(); 1601 final int type_index = nextByte(); 1602 final TypeAnnotationPosition position = TypeAnnotationPosition 1603 .methodRefTypeArg(readTypePath(), type_index); 1604 position.offset = offset; 1605 return position; 1606 } 1607 // We don't need to worry about these 1608 case METHOD_RETURN: 1609 return TypeAnnotationPosition.methodReturn(readTypePath()); 1610 case FIELD: 1611 return TypeAnnotationPosition.field(readTypePath()); 1612 case UNKNOWN: 1613 throw new AssertionError("jvm.ClassReader: UNKNOWN target type should never occur!"); 1614 default: 1615 throw new AssertionError("jvm.ClassReader: Unknown target type for position: " + type); 1616 } 1617 } 1618 1619 List<TypeAnnotationPosition.TypePathEntry> readTypePath() { 1620 int len = nextByte(); 1621 ListBuffer<Integer> loc = new ListBuffer<>(); 1622 for (int i = 0; i < len * TypeAnnotationPosition.TypePathEntry.bytesPerEntry; ++i) 1623 loc = loc.append(nextByte()); 1624 1625 return TypeAnnotationPosition.getTypePathFromBinary(loc.toList()); 1626 1627 } 1628 1629 Attribute readAttributeValue() { 1630 char c = (char) buf[bp++]; 1631 switch (c) { 1632 case 'B': 1633 return new Attribute.Constant(syms.byteType, readPool(nextChar())); 1634 case 'C': 1635 return new Attribute.Constant(syms.charType, readPool(nextChar())); 1636 case 'D': 1637 return new Attribute.Constant(syms.doubleType, readPool(nextChar())); 1638 case 'F': 1639 return new Attribute.Constant(syms.floatType, readPool(nextChar())); 1640 case 'I': 1641 return new Attribute.Constant(syms.intType, readPool(nextChar())); 1642 case 'J': 1643 return new Attribute.Constant(syms.longType, readPool(nextChar())); 1644 case 'S': 1645 return new Attribute.Constant(syms.shortType, readPool(nextChar())); 1646 case 'Z': 1647 return new Attribute.Constant(syms.booleanType, readPool(nextChar())); 1648 case 's': 1649 return new Attribute.Constant(syms.stringType, readPool(nextChar()).toString()); 1650 case 'e': 1651 return new EnumAttributeProxy(readEnumType(nextChar()), readName(nextChar())); 1652 case 'c': 1653 return new Attribute.Class(types, readTypeOrClassSymbol(nextChar())); 1654 case '[': { 1655 int n = nextChar(); 1656 ListBuffer<Attribute> l = new ListBuffer<>(); 1657 for (int i=0; i<n; i++) 1658 l.append(readAttributeValue()); 1659 return new ArrayAttributeProxy(l.toList()); 1660 } 1661 case '@': 1662 return readCompoundAnnotation(); 1663 default: 1664 throw new AssertionError("unknown annotation tag '" + c + "'"); 1665 } 1666 } 1667 1668 interface ProxyVisitor extends Attribute.Visitor { 1669 void visitEnumAttributeProxy(EnumAttributeProxy proxy); 1670 void visitArrayAttributeProxy(ArrayAttributeProxy proxy); 1671 void visitCompoundAnnotationProxy(CompoundAnnotationProxy proxy); 1672 } 1673 1674 static class EnumAttributeProxy extends Attribute { 1675 Type enumType; 1676 Name enumerator; 1677 public EnumAttributeProxy(Type enumType, Name enumerator) { 1678 super(null); 1679 this.enumType = enumType; 1680 this.enumerator = enumerator; 1681 } 1682 public void accept(Visitor v) { ((ProxyVisitor)v).visitEnumAttributeProxy(this); } 1683 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1684 public String toString() { 1685 return "/*proxy enum*/" + enumType + "." + enumerator; 1686 } 1687 } 1688 1689 static class ArrayAttributeProxy extends Attribute { 1690 List<Attribute> values; 1691 ArrayAttributeProxy(List<Attribute> values) { 1692 super(null); 1693 this.values = values; 1694 } 1695 public void accept(Visitor v) { ((ProxyVisitor)v).visitArrayAttributeProxy(this); } 1696 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1697 public String toString() { 1698 return "{" + values + "}"; 1699 } 1700 } 1701 1702 /** A temporary proxy representing a compound attribute. 1703 */ 1704 static class CompoundAnnotationProxy extends Attribute { 1705 final List<Pair<Name,Attribute>> values; 1706 public CompoundAnnotationProxy(Type type, 1707 List<Pair<Name,Attribute>> values) { 1708 super(type); 1709 this.values = values; 1710 } 1711 public void accept(Visitor v) { ((ProxyVisitor)v).visitCompoundAnnotationProxy(this); } 1712 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1713 public String toString() { 1714 StringBuilder buf = new StringBuilder(); 1715 buf.append("@"); 1716 buf.append(type.tsym.getQualifiedName()); 1717 buf.append("/*proxy*/{"); 1718 boolean first = true; 1719 for (List<Pair<Name,Attribute>> v = values; 1720 v.nonEmpty(); v = v.tail) { 1721 Pair<Name,Attribute> value = v.head; 1722 if (!first) buf.append(","); 1723 first = false; 1724 buf.append(value.fst); 1725 buf.append("="); 1726 buf.append(value.snd); 1727 } 1728 buf.append("}"); 1729 return buf.toString(); 1730 } 1731 } 1732 1733 /** A temporary proxy representing a type annotation. 1734 */ 1735 static class TypeAnnotationProxy { 1736 final CompoundAnnotationProxy compound; 1737 final TypeAnnotationPosition position; 1738 public TypeAnnotationProxy(CompoundAnnotationProxy compound, 1739 TypeAnnotationPosition position) { 1740 this.compound = compound; 1741 this.position = position; 1742 } 1743 } 1744 1745 class AnnotationDeproxy implements ProxyVisitor { 1746 private ClassSymbol requestingOwner; 1747 1748 AnnotationDeproxy(ClassSymbol owner) { 1749 this.requestingOwner = owner; 1750 } 1751 1752 List<Attribute.Compound> deproxyCompoundList(List<CompoundAnnotationProxy> pl) { 1753 // also must fill in types!!!! 1754 ListBuffer<Attribute.Compound> buf = new ListBuffer<>(); 1755 for (List<CompoundAnnotationProxy> l = pl; l.nonEmpty(); l=l.tail) { 1756 buf.append(deproxyCompound(l.head)); 1757 } 1758 return buf.toList(); 1759 } 1760 1761 Attribute.Compound deproxyCompound(CompoundAnnotationProxy a) { 1762 ListBuffer<Pair<Symbol.MethodSymbol,Attribute>> buf = new ListBuffer<>(); 1763 for (List<Pair<Name,Attribute>> l = a.values; 1764 l.nonEmpty(); 1765 l = l.tail) { 1766 MethodSymbol meth = findAccessMethod(a.type, l.head.fst); 1767 buf.append(new Pair<>(meth, deproxy(meth.type.getReturnType(), l.head.snd))); 1768 } 1769 return new Attribute.Compound(a.type, buf.toList()); 1770 } 1771 1772 MethodSymbol findAccessMethod(Type container, Name name) { 1773 CompletionFailure failure = null; 1774 try { 1775 for (Symbol sym : container.tsym.members().getSymbolsByName(name)) { 1776 if (sym.kind == MTH && sym.type.getParameterTypes().length() == 0) 1777 return (MethodSymbol) sym; 1778 } 1779 } catch (CompletionFailure ex) { 1780 failure = ex; 1781 } 1782 // The method wasn't found: emit a warning and recover 1783 JavaFileObject prevSource = log.useSource(requestingOwner.classfile); 1784 try { 1785 if (lintClassfile) { 1786 if (failure == null) { 1787 log.warning("annotation.method.not.found", 1788 container, 1789 name); 1790 } else { 1791 log.warning("annotation.method.not.found.reason", 1792 container, 1793 name, 1794 failure.getDetailValue());//diagnostic, if present 1795 } 1796 } 1797 } finally { 1798 log.useSource(prevSource); 1799 } 1800 // Construct a new method type and symbol. Use bottom 1801 // type (typeof null) as return type because this type is 1802 // a subtype of all reference types and can be converted 1803 // to primitive types by unboxing. 1804 MethodType mt = new MethodType(List.<Type>nil(), 1805 syms.botType, 1806 List.<Type>nil(), 1807 syms.methodClass); 1808 return new MethodSymbol(PUBLIC | ABSTRACT, name, mt, container.tsym); 1809 } 1810 1811 Attribute result; 1812 Type type; 1813 Attribute deproxy(Type t, Attribute a) { 1814 Type oldType = type; 1815 try { 1816 type = t; 1817 a.accept(this); 1818 return result; 1819 } finally { 1820 type = oldType; 1821 } 1822 } 1823 1824 // implement Attribute.Visitor below 1825 1826 public void visitConstant(Attribute.Constant value) { 1827 // assert value.type == type; 1828 result = value; 1829 } 1830 1831 public void visitClass(Attribute.Class clazz) { 1832 result = clazz; 1833 } 1834 1835 public void visitEnum(Attribute.Enum e) { 1836 throw new AssertionError(); // shouldn't happen 1837 } 1838 1839 public void visitCompound(Attribute.Compound compound) { 1840 throw new AssertionError(); // shouldn't happen 1841 } 1842 1843 public void visitArray(Attribute.Array array) { 1844 throw new AssertionError(); // shouldn't happen 1845 } 1846 1847 public void visitError(Attribute.Error e) { 1848 throw new AssertionError(); // shouldn't happen 1849 } 1850 1851 public void visitEnumAttributeProxy(EnumAttributeProxy proxy) { 1852 // type.tsym.flatName() should == proxy.enumFlatName 1853 TypeSymbol enumTypeSym = proxy.enumType.tsym; 1854 VarSymbol enumerator = null; 1855 CompletionFailure failure = null; 1856 try { 1857 for (Symbol sym : enumTypeSym.members().getSymbolsByName(proxy.enumerator)) { 1858 if (sym.kind == VAR) { 1859 enumerator = (VarSymbol)sym; 1860 break; 1861 } 1862 } 1863 } 1864 catch (CompletionFailure ex) { 1865 failure = ex; 1866 } 1867 if (enumerator == null) { 1868 if (failure != null) { 1869 log.warning("unknown.enum.constant.reason", 1870 currentClassFile, enumTypeSym, proxy.enumerator, 1871 failure.getDiagnostic()); 1872 } else { 1873 log.warning("unknown.enum.constant", 1874 currentClassFile, enumTypeSym, proxy.enumerator); 1875 } 1876 result = new Attribute.Enum(enumTypeSym.type, 1877 new VarSymbol(0, proxy.enumerator, syms.botType, enumTypeSym)); 1878 } else { 1879 result = new Attribute.Enum(enumTypeSym.type, enumerator); 1880 } 1881 } 1882 1883 public void visitArrayAttributeProxy(ArrayAttributeProxy proxy) { 1884 int length = proxy.values.length(); 1885 Attribute[] ats = new Attribute[length]; 1886 Type elemtype = types.elemtype(type); 1887 int i = 0; 1888 for (List<Attribute> p = proxy.values; p.nonEmpty(); p = p.tail) { 1889 ats[i++] = deproxy(elemtype, p.head); 1890 } 1891 result = new Attribute.Array(type, ats); 1892 } 1893 1894 public void visitCompoundAnnotationProxy(CompoundAnnotationProxy proxy) { 1895 result = deproxyCompound(proxy); 1896 } 1897 } 1898 1899 class AnnotationDefaultCompleter extends AnnotationDeproxy implements Runnable { 1900 final MethodSymbol sym; 1901 final Attribute value; 1902 final JavaFileObject classFile = currentClassFile; 1903 1904 AnnotationDefaultCompleter(MethodSymbol sym, Attribute value) { 1905 super(currentOwner.kind == MTH 1906 ? currentOwner.enclClass() : (ClassSymbol)currentOwner); 1907 this.sym = sym; 1908 this.value = value; 1909 } 1910 1911 @Override 1912 public void run() { 1913 JavaFileObject previousClassFile = currentClassFile; 1914 try { 1915 // Reset the interim value set earlier in 1916 // attachAnnotationDefault(). 1917 sym.defaultValue = null; 1918 currentClassFile = classFile; 1919 sym.defaultValue = deproxy(sym.type.getReturnType(), value); 1920 } finally { 1921 currentClassFile = previousClassFile; 1922 } 1923 } 1924 1925 @Override 1926 public String toString() { 1927 return " ClassReader store default for " + sym.owner + "." + sym + " is " + value; 1928 } 1929 } 1930 1931 class AnnotationCompleter extends AnnotationDeproxy implements Runnable { 1932 final Symbol sym; 1933 final List<CompoundAnnotationProxy> l; 1934 final JavaFileObject classFile; 1935 1936 AnnotationCompleter(Symbol sym, List<CompoundAnnotationProxy> l) { 1937 super(currentOwner.kind == MTH 1938 ? currentOwner.enclClass() : (ClassSymbol)currentOwner); 1939 this.sym = sym; 1940 this.l = l; 1941 this.classFile = currentClassFile; 1942 } 1943 1944 @Override 1945 public void run() { 1946 JavaFileObject previousClassFile = currentClassFile; 1947 try { 1948 currentClassFile = classFile; 1949 List<Attribute.Compound> newList = deproxyCompoundList(l); 1950 if (sym.annotationsPendingCompletion()) { 1951 sym.setDeclarationAttributes(newList); 1952 } else { 1953 sym.appendAttributes(newList); 1954 } 1955 } finally { 1956 currentClassFile = previousClassFile; 1957 } 1958 } 1959 1960 @Override 1961 public String toString() { 1962 return " ClassReader annotate " + sym.owner + "." + sym + " with " + l; 1963 } 1964 } 1965 1966 class TypeAnnotationCompleter extends AnnotationCompleter { 1967 1968 List<TypeAnnotationProxy> proxies; 1969 1970 TypeAnnotationCompleter(Symbol sym, 1971 List<TypeAnnotationProxy> proxies) { 1972 super(sym, List.<CompoundAnnotationProxy>nil()); 1973 this.proxies = proxies; 1974 } 1975 1976 List<Attribute.TypeCompound> deproxyTypeCompoundList(List<TypeAnnotationProxy> proxies) { 1977 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>(); 1978 for (TypeAnnotationProxy proxy: proxies) { 1979 Attribute.Compound compound = deproxyCompound(proxy.compound); 1980 Attribute.TypeCompound typeCompound = new Attribute.TypeCompound(compound, proxy.position); 1981 buf.add(typeCompound); 1982 } 1983 return buf.toList(); 1984 } 1985 1986 @Override 1987 public void run() { 1988 JavaFileObject previousClassFile = currentClassFile; 1989 try { 1990 currentClassFile = classFile; 1991 List<Attribute.TypeCompound> newList = deproxyTypeCompoundList(proxies); 1992 sym.setTypeAttributes(newList.prependList(sym.getRawTypeAttributes())); 1993 } finally { 1994 currentClassFile = previousClassFile; 1995 } 1996 } 1997 } 1998 1999 2000/************************************************************************ 2001 * Reading Symbols 2002 ***********************************************************************/ 2003 2004 /** Read a field. 2005 */ 2006 VarSymbol readField() { 2007 long flags = adjustFieldFlags(nextChar()); 2008 Name name = readName(nextChar()); 2009 Type type = readType(nextChar()); 2010 VarSymbol v = new VarSymbol(flags, name, type, currentOwner); 2011 readMemberAttrs(v); 2012 return v; 2013 } 2014 2015 /** Read a method. 2016 */ 2017 MethodSymbol readMethod() { 2018 long flags = adjustMethodFlags(nextChar()); 2019 Name name = readName(nextChar()); 2020 Type type = readType(nextChar()); 2021 if (currentOwner.isInterface() && 2022 (flags & ABSTRACT) == 0 && !name.equals(names.clinit)) { 2023 if (majorVersion > Version.V52.major || 2024 (majorVersion == Version.V52.major && minorVersion >= Version.V52.minor)) { 2025 if ((flags & STATIC) == 0) { 2026 currentOwner.flags_field |= DEFAULT; 2027 flags |= DEFAULT | ABSTRACT; 2028 } 2029 } else { 2030 //protect against ill-formed classfiles 2031 throw badClassFile((flags & STATIC) == 0 ? "invalid.default.interface" : "invalid.static.interface", 2032 Integer.toString(majorVersion), 2033 Integer.toString(minorVersion)); 2034 } 2035 } 2036 if (name == names.init && currentOwner.hasOuterInstance()) { 2037 // Sometimes anonymous classes don't have an outer 2038 // instance, however, there is no reliable way to tell so 2039 // we never strip this$n 2040 if (!currentOwner.name.isEmpty()) 2041 type = new MethodType(adjustMethodParams(flags, type.getParameterTypes()), 2042 type.getReturnType(), 2043 type.getThrownTypes(), 2044 syms.methodClass); 2045 } 2046 MethodSymbol m = new MethodSymbol(flags, name, type, currentOwner); 2047 if (types.isSignaturePolymorphic(m)) { 2048 m.flags_field |= SIGNATURE_POLYMORPHIC; 2049 } 2050 if (saveParameterNames) 2051 initParameterNames(m); 2052 Symbol prevOwner = currentOwner; 2053 currentOwner = m; 2054 try { 2055 readMemberAttrs(m); 2056 } finally { 2057 currentOwner = prevOwner; 2058 } 2059 if (saveParameterNames) 2060 setParameterNames(m, type); 2061 2062 if ((flags & VARARGS) != 0) { 2063 final Type last = type.getParameterTypes().last(); 2064 if (last == null || !last.hasTag(ARRAY)) { 2065 m.flags_field &= ~VARARGS; 2066 throw badClassFile("malformed.vararg.method", m); 2067 } 2068 } 2069 2070 return m; 2071 } 2072 2073 private List<Type> adjustMethodParams(long flags, List<Type> args) { 2074 boolean isVarargs = (flags & VARARGS) != 0; 2075 if (isVarargs) { 2076 Type varargsElem = args.last(); 2077 ListBuffer<Type> adjustedArgs = new ListBuffer<>(); 2078 for (Type t : args) { 2079 adjustedArgs.append(t != varargsElem ? 2080 t : 2081 ((ArrayType)t).makeVarargs()); 2082 } 2083 args = adjustedArgs.toList(); 2084 } 2085 return args.tail; 2086 } 2087 2088 /** 2089 * Init the parameter names array. 2090 * Parameter names are currently inferred from the names in the 2091 * LocalVariableTable attributes of a Code attribute. 2092 * (Note: this means parameter names are currently not available for 2093 * methods without a Code attribute.) 2094 * This method initializes an array in which to store the name indexes 2095 * of parameter names found in LocalVariableTable attributes. It is 2096 * slightly supersized to allow for additional slots with a start_pc of 0. 2097 */ 2098 void initParameterNames(MethodSymbol sym) { 2099 // make allowance for synthetic parameters. 2100 final int excessSlots = 4; 2101 int expectedParameterSlots = 2102 Code.width(sym.type.getParameterTypes()) + excessSlots; 2103 if (parameterNameIndices == null 2104 || parameterNameIndices.length < expectedParameterSlots) { 2105 parameterNameIndices = new int[expectedParameterSlots]; 2106 } else 2107 Arrays.fill(parameterNameIndices, 0); 2108 haveParameterNameIndices = false; 2109 sawMethodParameters = false; 2110 } 2111 2112 /** 2113 * Set the parameter names for a symbol from the name index in the 2114 * parameterNameIndicies array. The type of the symbol may have changed 2115 * while reading the method attributes (see the Signature attribute). 2116 * This may be because of generic information or because anonymous 2117 * synthetic parameters were added. The original type (as read from 2118 * the method descriptor) is used to help guess the existence of 2119 * anonymous synthetic parameters. 2120 * On completion, sym.savedParameter names will either be null (if 2121 * no parameter names were found in the class file) or will be set to a 2122 * list of names, one per entry in sym.type.getParameterTypes, with 2123 * any missing names represented by the empty name. 2124 */ 2125 void setParameterNames(MethodSymbol sym, Type jvmType) { 2126 // if no names were found in the class file, there's nothing more to do 2127 if (!haveParameterNameIndices) 2128 return; 2129 // If we get parameter names from MethodParameters, then we 2130 // don't need to skip. 2131 int firstParam = 0; 2132 if (!sawMethodParameters) { 2133 firstParam = ((sym.flags() & STATIC) == 0) ? 1 : 0; 2134 // the code in readMethod may have skipped the first 2135 // parameter when setting up the MethodType. If so, we 2136 // make a corresponding allowance here for the position of 2137 // the first parameter. Note that this assumes the 2138 // skipped parameter has a width of 1 -- i.e. it is not 2139 // a double width type (long or double.) 2140 if (sym.name == names.init && currentOwner.hasOuterInstance()) { 2141 // Sometimes anonymous classes don't have an outer 2142 // instance, however, there is no reliable way to tell so 2143 // we never strip this$n 2144 if (!currentOwner.name.isEmpty()) 2145 firstParam += 1; 2146 } 2147 2148 if (sym.type != jvmType) { 2149 // reading the method attributes has caused the 2150 // symbol's type to be changed. (i.e. the Signature 2151 // attribute.) This may happen if there are hidden 2152 // (synthetic) parameters in the descriptor, but not 2153 // in the Signature. The position of these hidden 2154 // parameters is unspecified; for now, assume they are 2155 // at the beginning, and so skip over them. The 2156 // primary case for this is two hidden parameters 2157 // passed into Enum constructors. 2158 int skip = Code.width(jvmType.getParameterTypes()) 2159 - Code.width(sym.type.getParameterTypes()); 2160 firstParam += skip; 2161 } 2162 } 2163 List<Name> paramNames = List.nil(); 2164 int index = firstParam; 2165 for (Type t: sym.type.getParameterTypes()) { 2166 int nameIdx = (index < parameterNameIndices.length 2167 ? parameterNameIndices[index] : 0); 2168 Name name = nameIdx == 0 ? names.empty : readName(nameIdx); 2169 paramNames = paramNames.prepend(name); 2170 index += Code.width(t); 2171 } 2172 sym.savedParameterNames = paramNames.reverse(); 2173 } 2174 2175 /** 2176 * skip n bytes 2177 */ 2178 void skipBytes(int n) { 2179 bp = bp + n; 2180 } 2181 2182 /** Skip a field or method 2183 */ 2184 void skipMember() { 2185 bp = bp + 6; 2186 char ac = nextChar(); 2187 for (int i = 0; i < ac; i++) { 2188 bp = bp + 2; 2189 int attrLen = nextInt(); 2190 bp = bp + attrLen; 2191 } 2192 } 2193 2194 /** Enter type variables of this classtype and all enclosing ones in 2195 * `typevars'. 2196 */ 2197 protected void enterTypevars(Type t) { 2198 if (t.getEnclosingType() != null && t.getEnclosingType().hasTag(CLASS)) 2199 enterTypevars(t.getEnclosingType()); 2200 for (List<Type> xs = t.getTypeArguments(); xs.nonEmpty(); xs = xs.tail) 2201 typevars.enter(xs.head.tsym); 2202 } 2203 2204 protected void enterTypevars(Symbol sym) { 2205 if (sym.owner.kind == MTH) { 2206 enterTypevars(sym.owner); 2207 enterTypevars(sym.owner.owner); 2208 } 2209 enterTypevars(sym.type); 2210 } 2211 2212 /** Read contents of a given class symbol `c'. Both external and internal 2213 * versions of an inner class are read. 2214 */ 2215 void readClass(ClassSymbol c) { 2216 ClassType ct = (ClassType)c.type; 2217 2218 // allocate scope for members 2219 c.members_field = WriteableScope.create(c); 2220 2221 // prepare type variable table 2222 typevars = typevars.dup(currentOwner); 2223 if (ct.getEnclosingType().hasTag(CLASS)) 2224 enterTypevars(ct.getEnclosingType()); 2225 2226 // read flags, or skip if this is an inner class 2227 long flags = adjustClassFlags(nextChar()); 2228 if (c.owner.kind == PCK) c.flags_field = flags; 2229 2230 // read own class name and check that it matches 2231 ClassSymbol self = readClassSymbol(nextChar()); 2232 if (c != self) 2233 throw badClassFile("class.file.wrong.class", 2234 self.flatname); 2235 2236 // class attributes must be read before class 2237 // skip ahead to read class attributes 2238 int startbp = bp; 2239 nextChar(); 2240 char interfaceCount = nextChar(); 2241 bp += interfaceCount * 2; 2242 char fieldCount = nextChar(); 2243 for (int i = 0; i < fieldCount; i++) skipMember(); 2244 char methodCount = nextChar(); 2245 for (int i = 0; i < methodCount; i++) skipMember(); 2246 readClassAttrs(c); 2247 2248 if (readAllOfClassFile) { 2249 for (int i = 1; i < poolObj.length; i++) readPool(i); 2250 c.pool = new Pool(poolObj.length, poolObj, types); 2251 } 2252 2253 // reset and read rest of classinfo 2254 bp = startbp; 2255 int n = nextChar(); 2256 if (ct.supertype_field == null) 2257 ct.supertype_field = (n == 0) 2258 ? Type.noType 2259 : readClassSymbol(n).erasure(types); 2260 n = nextChar(); 2261 List<Type> is = List.nil(); 2262 for (int i = 0; i < n; i++) { 2263 Type _inter = readClassSymbol(nextChar()).erasure(types); 2264 is = is.prepend(_inter); 2265 } 2266 if (ct.interfaces_field == null) 2267 ct.interfaces_field = is.reverse(); 2268 2269 Assert.check(fieldCount == nextChar()); 2270 for (int i = 0; i < fieldCount; i++) enterMember(c, readField()); 2271 Assert.check(methodCount == nextChar()); 2272 for (int i = 0; i < methodCount; i++) enterMember(c, readMethod()); 2273 2274 typevars = typevars.leave(); 2275 } 2276 2277 /** Read inner class info. For each inner/outer pair allocate a 2278 * member class. 2279 */ 2280 void readInnerClasses(ClassSymbol c) { 2281 int n = nextChar(); 2282 for (int i = 0; i < n; i++) { 2283 nextChar(); // skip inner class symbol 2284 ClassSymbol outer = readClassSymbol(nextChar()); 2285 Name name = readName(nextChar()); 2286 if (name == null) name = names.empty; 2287 long flags = adjustClassFlags(nextChar()); 2288 if (outer != null) { // we have a member class 2289 if (name == names.empty) 2290 name = names.one; 2291 ClassSymbol member = syms.enterClass(name, outer); 2292 if ((flags & STATIC) == 0) { 2293 ((ClassType)member.type).setEnclosingType(outer.type); 2294 if (member.erasure_field != null) 2295 ((ClassType)member.erasure_field).setEnclosingType(types.erasure(outer.type)); 2296 } 2297 if (c == outer) { 2298 member.flags_field = flags; 2299 enterMember(c, member); 2300 } 2301 } 2302 } 2303 } 2304 2305 /** Read a class definition from the bytes in buf. 2306 */ 2307 private void readClassBuffer(ClassSymbol c) throws IOException { 2308 int magic = nextInt(); 2309 if (magic != JAVA_MAGIC) 2310 throw badClassFile("illegal.start.of.class.file"); 2311 2312 minorVersion = nextChar(); 2313 majorVersion = nextChar(); 2314 int maxMajor = Version.MAX().major; 2315 int maxMinor = Version.MAX().minor; 2316 if (majorVersion > maxMajor || 2317 majorVersion * 1000 + minorVersion < 2318 Version.MIN().major * 1000 + Version.MIN().minor) 2319 { 2320 if (majorVersion == (maxMajor + 1)) 2321 log.warning("big.major.version", 2322 currentClassFile, 2323 majorVersion, 2324 maxMajor); 2325 else 2326 throw badClassFile("wrong.version", 2327 Integer.toString(majorVersion), 2328 Integer.toString(minorVersion), 2329 Integer.toString(maxMajor), 2330 Integer.toString(maxMinor)); 2331 } 2332 else if (checkClassFile && 2333 majorVersion == maxMajor && 2334 minorVersion > maxMinor) 2335 { 2336 printCCF("found.later.version", 2337 Integer.toString(minorVersion)); 2338 } 2339 indexPool(); 2340 if (signatureBuffer.length < bp) { 2341 int ns = Integer.highestOneBit(bp) << 1; 2342 signatureBuffer = new byte[ns]; 2343 } 2344 readClass(c); 2345 } 2346 2347 public void readClassFile(ClassSymbol c) { 2348 currentOwner = c; 2349 currentClassFile = c.classfile; 2350 warnedAttrs.clear(); 2351 filling = true; 2352 target = null; 2353 repeatable = null; 2354 try { 2355 bp = 0; 2356 buf = readInputStream(buf, c.classfile.openInputStream()); 2357 readClassBuffer(c); 2358 if (!missingTypeVariables.isEmpty() && !foundTypeVariables.isEmpty()) { 2359 List<Type> missing = missingTypeVariables; 2360 List<Type> found = foundTypeVariables; 2361 missingTypeVariables = List.nil(); 2362 foundTypeVariables = List.nil(); 2363 filling = false; 2364 ClassType ct = (ClassType)currentOwner.type; 2365 ct.supertype_field = 2366 types.subst(ct.supertype_field, missing, found); 2367 ct.interfaces_field = 2368 types.subst(ct.interfaces_field, missing, found); 2369 } else if (missingTypeVariables.isEmpty() != 2370 foundTypeVariables.isEmpty()) { 2371 Name name = missingTypeVariables.head.tsym.name; 2372 throw badClassFile("undecl.type.var", name); 2373 } 2374 2375 if ((c.flags_field & Flags.ANNOTATION) != 0) { 2376 c.setAnnotationTypeMetadata(new AnnotationTypeMetadata(c, new CompleterDeproxy(c, target, repeatable))); 2377 } else { 2378 c.setAnnotationTypeMetadata(AnnotationTypeMetadata.notAnAnnotationType()); 2379 } 2380 } catch (IOException ex) { 2381 throw badClassFile("unable.to.access.file", ex.getMessage()); 2382 } catch (ArrayIndexOutOfBoundsException ex) { 2383 throw badClassFile("bad.class.file", c.flatname); 2384 } finally { 2385 missingTypeVariables = List.nil(); 2386 foundTypeVariables = List.nil(); 2387 filling = false; 2388 } 2389 } 2390 // where 2391 private static byte[] readInputStream(byte[] buf, InputStream s) throws IOException { 2392 try { 2393 buf = ensureCapacity(buf, s.available()); 2394 int r = s.read(buf); 2395 int bp = 0; 2396 while (r != -1) { 2397 bp += r; 2398 buf = ensureCapacity(buf, bp); 2399 r = s.read(buf, bp, buf.length - bp); 2400 } 2401 return buf; 2402 } finally { 2403 try { 2404 s.close(); 2405 } catch (IOException e) { 2406 /* Ignore any errors, as this stream may have already 2407 * thrown a related exception which is the one that 2408 * should be reported. 2409 */ 2410 } 2411 } 2412 } 2413 /* 2414 * ensureCapacity will increase the buffer as needed, taking note that 2415 * the new buffer will always be greater than the needed and never 2416 * exactly equal to the needed size or bp. If equal then the read (above) 2417 * will infinitely loop as buf.length - bp == 0. 2418 */ 2419 private static byte[] ensureCapacity(byte[] buf, int needed) { 2420 if (buf.length <= needed) { 2421 byte[] old = buf; 2422 buf = new byte[Integer.highestOneBit(needed) << 1]; 2423 System.arraycopy(old, 0, buf, 0, old.length); 2424 } 2425 return buf; 2426 } 2427 2428 /** We can only read a single class file at a time; this 2429 * flag keeps track of when we are currently reading a class 2430 * file. 2431 */ 2432 public boolean filling = false; 2433 2434/************************************************************************ 2435 * Adjusting flags 2436 ***********************************************************************/ 2437 2438 long adjustFieldFlags(long flags) { 2439 return flags; 2440 } 2441 2442 long adjustMethodFlags(long flags) { 2443 if ((flags & ACC_BRIDGE) != 0) { 2444 flags &= ~ACC_BRIDGE; 2445 flags |= BRIDGE; 2446 } 2447 if ((flags & ACC_VARARGS) != 0) { 2448 flags &= ~ACC_VARARGS; 2449 flags |= VARARGS; 2450 } 2451 return flags; 2452 } 2453 2454 long adjustClassFlags(long flags) { 2455 return flags & ~ACC_SUPER; // SUPER and SYNCHRONIZED bits overloaded 2456 } 2457 2458 /** Output for "-checkclassfile" option. 2459 * @param key The key to look up the correct internationalized string. 2460 * @param arg An argument for substitution into the output string. 2461 */ 2462 private void printCCF(String key, Object arg) { 2463 log.printLines(key, arg); 2464 } 2465 2466 /** 2467 * A subclass of JavaFileObject for the sourcefile attribute found in a classfile. 2468 * The attribute is only the last component of the original filename, so is unlikely 2469 * to be valid as is, so operations other than those to access the name throw 2470 * UnsupportedOperationException 2471 */ 2472 private static class SourceFileObject implements JavaFileObject { 2473 2474 /** The file's name. 2475 */ 2476 private final Name name; 2477 private final Name flatname; 2478 2479 public SourceFileObject(Name name, Name flatname) { 2480 this.name = name; 2481 this.flatname = flatname; 2482 } 2483 2484 @Override @DefinedBy(Api.COMPILER) 2485 public URI toUri() { 2486 try { 2487 return new URI(null, name.toString(), null); 2488 } catch (URISyntaxException e) { 2489 throw new PathFileObject.CannotCreateUriError(name.toString(), e); 2490 } 2491 } 2492 2493 @Override @DefinedBy(Api.COMPILER) 2494 public String getName() { 2495 return name.toString(); 2496 } 2497 2498 @Override @DefinedBy(Api.COMPILER) 2499 public JavaFileObject.Kind getKind() { 2500 return BaseFileManager.getKind(getName()); 2501 } 2502 2503 @Override @DefinedBy(Api.COMPILER) 2504 public InputStream openInputStream() { 2505 throw new UnsupportedOperationException(); 2506 } 2507 2508 @Override @DefinedBy(Api.COMPILER) 2509 public OutputStream openOutputStream() { 2510 throw new UnsupportedOperationException(); 2511 } 2512 2513 @Override @DefinedBy(Api.COMPILER) 2514 public CharBuffer getCharContent(boolean ignoreEncodingErrors) { 2515 throw new UnsupportedOperationException(); 2516 } 2517 2518 @Override @DefinedBy(Api.COMPILER) 2519 public Reader openReader(boolean ignoreEncodingErrors) { 2520 throw new UnsupportedOperationException(); 2521 } 2522 2523 @Override @DefinedBy(Api.COMPILER) 2524 public Writer openWriter() { 2525 throw new UnsupportedOperationException(); 2526 } 2527 2528 @Override @DefinedBy(Api.COMPILER) 2529 public long getLastModified() { 2530 throw new UnsupportedOperationException(); 2531 } 2532 2533 @Override @DefinedBy(Api.COMPILER) 2534 public boolean delete() { 2535 throw new UnsupportedOperationException(); 2536 } 2537 2538 @Override @DefinedBy(Api.COMPILER) 2539 public boolean isNameCompatible(String simpleName, JavaFileObject.Kind kind) { 2540 return true; // fail-safe mode 2541 } 2542 2543 @Override @DefinedBy(Api.COMPILER) 2544 public NestingKind getNestingKind() { 2545 return null; 2546 } 2547 2548 @Override @DefinedBy(Api.COMPILER) 2549 public Modifier getAccessLevel() { 2550 return null; 2551 } 2552 2553 /** 2554 * Check if two file objects are equal. 2555 * SourceFileObjects are just placeholder objects for the value of a 2556 * SourceFile attribute, and do not directly represent specific files. 2557 * Two SourceFileObjects are equal if their names are equal. 2558 */ 2559 @Override 2560 public boolean equals(Object other) { 2561 if (this == other) 2562 return true; 2563 2564 if (!(other instanceof SourceFileObject)) 2565 return false; 2566 2567 SourceFileObject o = (SourceFileObject) other; 2568 return name.equals(o.name); 2569 } 2570 2571 @Override 2572 public int hashCode() { 2573 return name.hashCode(); 2574 } 2575 } 2576 2577 private class CompleterDeproxy implements AnnotationTypeCompleter { 2578 ClassSymbol proxyOn; 2579 CompoundAnnotationProxy target; 2580 CompoundAnnotationProxy repeatable; 2581 2582 public CompleterDeproxy(ClassSymbol c, CompoundAnnotationProxy target, 2583 CompoundAnnotationProxy repeatable) 2584 { 2585 this.proxyOn = c; 2586 this.target = target; 2587 this.repeatable = repeatable; 2588 } 2589 2590 @Override 2591 public void complete(ClassSymbol sym) { 2592 Assert.check(proxyOn == sym); 2593 Attribute.Compound theTarget = null, theRepeatable = null; 2594 AnnotationDeproxy deproxy; 2595 2596 try { 2597 if (target != null) { 2598 deproxy = new AnnotationDeproxy(proxyOn); 2599 theTarget = deproxy.deproxyCompound(target); 2600 } 2601 2602 if (repeatable != null) { 2603 deproxy = new AnnotationDeproxy(proxyOn); 2604 theRepeatable = deproxy.deproxyCompound(repeatable); 2605 } 2606 } catch (Exception e) { 2607 throw new CompletionFailure(sym, e.getMessage()); 2608 } 2609 2610 sym.getAnnotationTypeMetadata().setTarget(theTarget); 2611 sym.getAnnotationTypeMetadata().setRepeatable(theRepeatable); 2612 } 2613 } 2614} 2615