ClassReader.java revision 2628:8df25ec8c930
1/* 2 * Copyright (c) 1999, 2014, 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; 38import javax.tools.JavaFileObject; 39import javax.tools.JavaFileManager; 40 41import com.sun.tools.javac.comp.Annotate; 42import com.sun.tools.javac.code.*; 43import com.sun.tools.javac.code.Lint.LintCategory; 44import com.sun.tools.javac.code.Type.*; 45import com.sun.tools.javac.code.Scope.WriteableScope; 46import com.sun.tools.javac.code.Symbol.*; 47import com.sun.tools.javac.code.Symtab; 48import com.sun.tools.javac.file.BaseFileObject; 49import com.sun.tools.javac.util.*; 50import com.sun.tools.javac.util.DefinedBy.Api; 51import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 52 53import static com.sun.tools.javac.code.Flags.*; 54import static com.sun.tools.javac.code.Kinds.*; 55import static com.sun.tools.javac.code.TypeTag.CLASS; 56import static com.sun.tools.javac.code.TypeTag.TYPEVAR; 57import static com.sun.tools.javac.jvm.ClassFile.*; 58import static com.sun.tools.javac.jvm.ClassFile.Version.*; 59 60import static com.sun.tools.javac.main.Option.*; 61 62/** This class provides operations to read a classfile into an internal 63 * representation. The internal representation is anchored in a 64 * ClassSymbol which contains in its scope symbol representations 65 * for all other definitions in the classfile. Top-level Classes themselves 66 * appear as members of the scopes of PackageSymbols. 67 * 68 * <p><b>This is NOT part of any supported API. 69 * If you write code that depends on this, you do so at your own risk. 70 * This code and its internal interfaces are subject to change or 71 * deletion without notice.</b> 72 */ 73public class ClassReader { 74 /** The context key for the class reader. */ 75 protected static final Context.Key<ClassReader> classReaderKey = new Context.Key<>(); 76 77 public static final int INITIAL_BUFFER_SIZE = 0x0fff0; 78 79 Annotate annotate; 80 81 /** Switch: verbose output. 82 */ 83 boolean verbose; 84 85 /** Switch: check class file for correct minor version, unrecognized 86 * attributes. 87 */ 88 boolean checkClassFile; 89 90 /** Switch: read constant pool and code sections. This switch is initially 91 * set to false but can be turned on from outside. 92 */ 93 public boolean readAllOfClassFile = false; 94 95 /** Switch: allow simplified varargs. 96 */ 97 boolean allowSimplifiedVarargs; 98 99 /** Lint option: warn about classfile issues 100 */ 101 boolean lintClassfile; 102 103 /** Switch: preserve parameter names from the variable table. 104 */ 105 public boolean saveParameterNames; 106 107 /** 108 * The currently selected profile. 109 */ 110 public final Profile profile; 111 112 /** The log to use for verbose output 113 */ 114 final Log log; 115 116 /** The symbol table. */ 117 Symtab syms; 118 119 Types types; 120 121 /** The name table. */ 122 final Names names; 123 124 /** Access to files 125 */ 126 private final JavaFileManager fileManager; 127 128 /** Factory for diagnostics 129 */ 130 JCDiagnostic.Factory diagFactory; 131 132 /** The current scope where type variables are entered. 133 */ 134 protected WriteableScope typevars; 135 136 /** The path name of the class file currently being read. 137 */ 138 protected JavaFileObject currentClassFile = null; 139 140 /** The class or method currently being read. 141 */ 142 protected Symbol currentOwner = null; 143 144 /** The buffer containing the currently read class file. 145 */ 146 byte[] buf = new byte[INITIAL_BUFFER_SIZE]; 147 148 /** The current input pointer. 149 */ 150 protected int bp; 151 152 /** The objects of the constant pool. 153 */ 154 Object[] poolObj; 155 156 /** For every constant pool entry, an index into buf where the 157 * defining section of the entry is found. 158 */ 159 int[] poolIdx; 160 161 /** The major version number of the class file being read. */ 162 int majorVersion; 163 /** The minor version number of the class file being read. */ 164 int minorVersion; 165 166 /** A table to hold the constant pool indices for method parameter 167 * names, as given in LocalVariableTable attributes. 168 */ 169 int[] parameterNameIndices; 170 171 /** 172 * Whether or not any parameter names have been found. 173 */ 174 boolean haveParameterNameIndices; 175 176 /** Set this to false every time we start reading a method 177 * and are saving parameter names. Set it to true when we see 178 * MethodParameters, if it's set when we see a LocalVariableTable, 179 * then we ignore the parameter names from the LVT. 180 */ 181 boolean sawMethodParameters; 182 183 /** 184 * The set of attribute names for which warnings have been generated for the current class 185 */ 186 Set<Name> warnedAttrs = new HashSet<>(); 187 188 /** Get the ClassReader instance for this invocation. */ 189 public static ClassReader instance(Context context) { 190 ClassReader instance = context.get(classReaderKey); 191 if (instance == null) 192 instance = new ClassReader(context); 193 return instance; 194 } 195 196 /** Construct a new class reader. */ 197 protected ClassReader(Context context) { 198 context.put(classReaderKey, this); 199 names = Names.instance(context); 200 syms = Symtab.instance(context); 201 types = Types.instance(context); 202 fileManager = context.get(JavaFileManager.class); 203 if (fileManager == null) 204 throw new AssertionError("FileManager initialization error"); 205 diagFactory = JCDiagnostic.Factory.instance(context); 206 207 log = Log.instance(context); 208 209 Options options = Options.instance(context); 210 annotate = Annotate.instance(context); 211 verbose = options.isSet(VERBOSE); 212 checkClassFile = options.isSet("-checkclassfile"); 213 214 Source source = Source.instance(context); 215 allowSimplifiedVarargs = source.allowSimplifiedVarargs(); 216 217 saveParameterNames = options.isSet("save-parameter-names"); 218 219 profile = Profile.instance(context); 220 221 typevars = WriteableScope.create(syms.noSymbol); 222 223 lintClassfile = Lint.instance(context).isEnabled(LintCategory.CLASSFILE); 224 225 initAttributeReaders(); 226 } 227 228 /** Add member to class unless it is synthetic. 229 */ 230 private void enterMember(ClassSymbol c, Symbol sym) { 231 // Synthetic members are not entered -- reason lost to history (optimization?). 232 // Lambda methods must be entered because they may have inner classes (which reference them) 233 if ((sym.flags_field & (SYNTHETIC|BRIDGE)) != SYNTHETIC || sym.name.startsWith(names.lambda)) 234 c.members_field.enter(sym); 235 } 236 237/************************************************************************ 238 * Error Diagnoses 239 ***********************************************************************/ 240 241 public ClassFinder.BadClassFile badClassFile(String key, Object... args) { 242 return new ClassFinder.BadClassFile ( 243 currentOwner.enclClass(), 244 currentClassFile, 245 diagFactory.fragment(key, args), 246 diagFactory); 247 } 248 249/************************************************************************ 250 * Buffer Access 251 ***********************************************************************/ 252 253 /** Read a character. 254 */ 255 char nextChar() { 256 return (char)(((buf[bp++] & 0xFF) << 8) + (buf[bp++] & 0xFF)); 257 } 258 259 /** Read a byte. 260 */ 261 int nextByte() { 262 return buf[bp++] & 0xFF; 263 } 264 265 /** Read an integer. 266 */ 267 int nextInt() { 268 return 269 ((buf[bp++] & 0xFF) << 24) + 270 ((buf[bp++] & 0xFF) << 16) + 271 ((buf[bp++] & 0xFF) << 8) + 272 (buf[bp++] & 0xFF); 273 } 274 275 /** Extract a character at position bp from buf. 276 */ 277 char getChar(int bp) { 278 return 279 (char)(((buf[bp] & 0xFF) << 8) + (buf[bp+1] & 0xFF)); 280 } 281 282 /** Extract an integer at position bp from buf. 283 */ 284 int getInt(int bp) { 285 return 286 ((buf[bp] & 0xFF) << 24) + 287 ((buf[bp+1] & 0xFF) << 16) + 288 ((buf[bp+2] & 0xFF) << 8) + 289 (buf[bp+3] & 0xFF); 290 } 291 292 293 /** Extract a long integer at position bp from buf. 294 */ 295 long getLong(int bp) { 296 DataInputStream bufin = 297 new DataInputStream(new ByteArrayInputStream(buf, bp, 8)); 298 try { 299 return bufin.readLong(); 300 } catch (IOException e) { 301 throw new AssertionError(e); 302 } 303 } 304 305 /** Extract a float at position bp from buf. 306 */ 307 float getFloat(int bp) { 308 DataInputStream bufin = 309 new DataInputStream(new ByteArrayInputStream(buf, bp, 4)); 310 try { 311 return bufin.readFloat(); 312 } catch (IOException e) { 313 throw new AssertionError(e); 314 } 315 } 316 317 /** Extract a double at position bp from buf. 318 */ 319 double getDouble(int bp) { 320 DataInputStream bufin = 321 new DataInputStream(new ByteArrayInputStream(buf, bp, 8)); 322 try { 323 return bufin.readDouble(); 324 } catch (IOException e) { 325 throw new AssertionError(e); 326 } 327 } 328 329/************************************************************************ 330 * Constant Pool Access 331 ***********************************************************************/ 332 333 /** Index all constant pool entries, writing their start addresses into 334 * poolIdx. 335 */ 336 void indexPool() { 337 poolIdx = new int[nextChar()]; 338 poolObj = new Object[poolIdx.length]; 339 int i = 1; 340 while (i < poolIdx.length) { 341 poolIdx[i++] = bp; 342 byte tag = buf[bp++]; 343 switch (tag) { 344 case CONSTANT_Utf8: case CONSTANT_Unicode: { 345 int len = nextChar(); 346 bp = bp + len; 347 break; 348 } 349 case CONSTANT_Class: 350 case CONSTANT_String: 351 case CONSTANT_MethodType: 352 bp = bp + 2; 353 break; 354 case CONSTANT_MethodHandle: 355 bp = bp + 3; 356 break; 357 case CONSTANT_Fieldref: 358 case CONSTANT_Methodref: 359 case CONSTANT_InterfaceMethodref: 360 case CONSTANT_NameandType: 361 case CONSTANT_Integer: 362 case CONSTANT_Float: 363 case CONSTANT_InvokeDynamic: 364 bp = bp + 4; 365 break; 366 case CONSTANT_Long: 367 case CONSTANT_Double: 368 bp = bp + 8; 369 i++; 370 break; 371 default: 372 throw badClassFile("bad.const.pool.tag.at", 373 Byte.toString(tag), 374 Integer.toString(bp -1)); 375 } 376 } 377 } 378 379 /** Read constant pool entry at start address i, use pool as a cache. 380 */ 381 Object readPool(int i) { 382 Object result = poolObj[i]; 383 if (result != null) return result; 384 385 int index = poolIdx[i]; 386 if (index == 0) return null; 387 388 byte tag = buf[index]; 389 switch (tag) { 390 case CONSTANT_Utf8: 391 poolObj[i] = names.fromUtf(buf, index + 3, getChar(index + 1)); 392 break; 393 case CONSTANT_Unicode: 394 throw badClassFile("unicode.str.not.supported"); 395 case CONSTANT_Class: 396 poolObj[i] = readClassOrType(getChar(index + 1)); 397 break; 398 case CONSTANT_String: 399 // FIXME: (footprint) do not use toString here 400 poolObj[i] = readName(getChar(index + 1)).toString(); 401 break; 402 case CONSTANT_Fieldref: { 403 ClassSymbol owner = readClassSymbol(getChar(index + 1)); 404 NameAndType nt = readNameAndType(getChar(index + 3)); 405 poolObj[i] = new VarSymbol(0, nt.name, nt.uniqueType.type, owner); 406 break; 407 } 408 case CONSTANT_Methodref: 409 case CONSTANT_InterfaceMethodref: { 410 ClassSymbol owner = readClassSymbol(getChar(index + 1)); 411 NameAndType nt = readNameAndType(getChar(index + 3)); 412 poolObj[i] = new MethodSymbol(0, nt.name, nt.uniqueType.type, owner); 413 break; 414 } 415 case CONSTANT_NameandType: 416 poolObj[i] = new NameAndType( 417 readName(getChar(index + 1)), 418 readType(getChar(index + 3)), types); 419 break; 420 case CONSTANT_Integer: 421 poolObj[i] = getInt(index + 1); 422 break; 423 case CONSTANT_Float: 424 poolObj[i] = new Float(getFloat(index + 1)); 425 break; 426 case CONSTANT_Long: 427 poolObj[i] = new Long(getLong(index + 1)); 428 break; 429 case CONSTANT_Double: 430 poolObj[i] = new Double(getDouble(index + 1)); 431 break; 432 case CONSTANT_MethodHandle: 433 skipBytes(4); 434 break; 435 case CONSTANT_MethodType: 436 skipBytes(3); 437 break; 438 case CONSTANT_InvokeDynamic: 439 skipBytes(5); 440 break; 441 default: 442 throw badClassFile("bad.const.pool.tag", Byte.toString(tag)); 443 } 444 return poolObj[i]; 445 } 446 447 /** Read signature and convert to type. 448 */ 449 Type readType(int i) { 450 int index = poolIdx[i]; 451 return sigToType(buf, index + 3, getChar(index + 1)); 452 } 453 454 /** If name is an array type or class signature, return the 455 * corresponding type; otherwise return a ClassSymbol with given name. 456 */ 457 Object readClassOrType(int i) { 458 int index = poolIdx[i]; 459 int len = getChar(index + 1); 460 int start = index + 3; 461 Assert.check(buf[start] == '[' || buf[start + len - 1] != ';'); 462 // by the above assertion, the following test can be 463 // simplified to (buf[start] == '[') 464 return (buf[start] == '[' || buf[start + len - 1] == ';') 465 ? (Object)sigToType(buf, start, len) 466 : (Object)syms.enterClass(names.fromUtf(internalize(buf, start, 467 len))); 468 } 469 470 /** Read signature and convert to type parameters. 471 */ 472 List<Type> readTypeParams(int i) { 473 int index = poolIdx[i]; 474 return sigToTypeParams(buf, index + 3, getChar(index + 1)); 475 } 476 477 /** Read class entry. 478 */ 479 ClassSymbol readClassSymbol(int i) { 480 Object obj = readPool(i); 481 if (obj != null && !(obj instanceof ClassSymbol)) 482 throw badClassFile("bad.const.pool.entry", 483 currentClassFile.toString(), 484 "CONSTANT_Class_info", i); 485 return (ClassSymbol)obj; 486 } 487 488 /** Read name. 489 */ 490 Name readName(int i) { 491 Object obj = readPool(i); 492 if (obj != null && !(obj instanceof Name)) 493 throw badClassFile("bad.const.pool.entry", 494 currentClassFile.toString(), 495 "CONSTANT_Utf8_info or CONSTANT_String_info", i); 496 return (Name)obj; 497 } 498 499 /** Read name and type. 500 */ 501 NameAndType readNameAndType(int i) { 502 Object obj = readPool(i); 503 if (obj != null && !(obj instanceof NameAndType)) 504 throw badClassFile("bad.const.pool.entry", 505 currentClassFile.toString(), 506 "CONSTANT_NameAndType_info", i); 507 return (NameAndType)obj; 508 } 509 510/************************************************************************ 511 * Reading Types 512 ***********************************************************************/ 513 514 /** The unread portion of the currently read type is 515 * signature[sigp..siglimit-1]. 516 */ 517 byte[] signature; 518 int sigp; 519 int siglimit; 520 boolean sigEnterPhase = false; 521 522 /** Convert signature to type, where signature is a byte array segment. 523 */ 524 Type sigToType(byte[] sig, int offset, int len) { 525 signature = sig; 526 sigp = offset; 527 siglimit = offset + len; 528 return sigToType(); 529 } 530 531 /** Convert signature to type, where signature is implicit. 532 */ 533 Type sigToType() { 534 switch ((char) signature[sigp]) { 535 case 'T': 536 sigp++; 537 int start = sigp; 538 while (signature[sigp] != ';') sigp++; 539 sigp++; 540 return sigEnterPhase 541 ? Type.noType 542 : findTypeVar(names.fromUtf(signature, start, sigp - 1 - start)); 543 case '+': { 544 sigp++; 545 Type t = sigToType(); 546 return new WildcardType(t, BoundKind.EXTENDS, syms.boundClass, 547 Type.noAnnotations); 548 } 549 case '*': 550 sigp++; 551 return new WildcardType(syms.objectType, BoundKind.UNBOUND, 552 syms.boundClass, Type.noAnnotations); 553 case '-': { 554 sigp++; 555 Type t = sigToType(); 556 return new WildcardType(t, BoundKind.SUPER, syms.boundClass, 557 Type.noAnnotations); 558 } 559 case 'B': 560 sigp++; 561 return syms.byteType; 562 case 'C': 563 sigp++; 564 return syms.charType; 565 case 'D': 566 sigp++; 567 return syms.doubleType; 568 case 'F': 569 sigp++; 570 return syms.floatType; 571 case 'I': 572 sigp++; 573 return syms.intType; 574 case 'J': 575 sigp++; 576 return syms.longType; 577 case 'L': 578 { 579 // int oldsigp = sigp; 580 Type t = classSigToType(); 581 if (sigp < siglimit && signature[sigp] == '.') 582 throw badClassFile("deprecated inner class signature syntax " + 583 "(please recompile from source)"); 584 /* 585 System.err.println(" decoded " + 586 new String(signature, oldsigp, sigp-oldsigp) + 587 " => " + t + " outer " + t.outer()); 588 */ 589 return t; 590 } 591 case 'S': 592 sigp++; 593 return syms.shortType; 594 case 'V': 595 sigp++; 596 return syms.voidType; 597 case 'Z': 598 sigp++; 599 return syms.booleanType; 600 case '[': 601 sigp++; 602 return new ArrayType(sigToType(), syms.arrayClass, 603 Type.noAnnotations); 604 case '(': 605 sigp++; 606 List<Type> argtypes = sigToTypes(')'); 607 Type restype = sigToType(); 608 List<Type> thrown = List.nil(); 609 while (signature[sigp] == '^') { 610 sigp++; 611 thrown = thrown.prepend(sigToType()); 612 } 613 // if there is a typevar in the throws clause we should state it. 614 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail) { 615 if (l.head.hasTag(TYPEVAR)) { 616 l.head.tsym.flags_field |= THROWS; 617 } 618 } 619 return new MethodType(argtypes, 620 restype, 621 thrown.reverse(), 622 syms.methodClass); 623 case '<': 624 typevars = typevars.dup(currentOwner); 625 Type poly = new ForAll(sigToTypeParams(), sigToType()); 626 typevars = typevars.leave(); 627 return poly; 628 default: 629 throw badClassFile("bad.signature", 630 Convert.utf2string(signature, sigp, 10)); 631 } 632 } 633 634 byte[] signatureBuffer = new byte[0]; 635 int sbp = 0; 636 /** Convert class signature to type, where signature is implicit. 637 */ 638 Type classSigToType() { 639 if (signature[sigp] != 'L') 640 throw badClassFile("bad.class.signature", 641 Convert.utf2string(signature, sigp, 10)); 642 sigp++; 643 Type outer = Type.noType; 644 int startSbp = sbp; 645 646 while (true) { 647 final byte c = signature[sigp++]; 648 switch (c) { 649 650 case ';': { // end 651 ClassSymbol t = syms.enterClass(names.fromUtf(signatureBuffer, 652 startSbp, 653 sbp - startSbp)); 654 655 try { 656 return (outer == Type.noType) ? 657 t.erasure(types) : 658 new ClassType(outer, List.<Type>nil(), t, 659 Type.noAnnotations); 660 } finally { 661 sbp = startSbp; 662 } 663 } 664 665 case '<': // generic arguments 666 ClassSymbol t = syms.enterClass(names.fromUtf(signatureBuffer, 667 startSbp, 668 sbp - startSbp)); 669 outer = new ClassType(outer, sigToTypes('>'), t, 670 Type.noAnnotations) { 671 boolean completed = false; 672 @Override @DefinedBy(Api.LANGUAGE_MODEL) 673 public Type getEnclosingType() { 674 if (!completed) { 675 completed = true; 676 tsym.complete(); 677 Type enclosingType = tsym.type.getEnclosingType(); 678 if (enclosingType != Type.noType) { 679 List<Type> typeArgs = 680 super.getEnclosingType().allparams(); 681 List<Type> typeParams = 682 enclosingType.allparams(); 683 if (typeParams.length() != typeArgs.length()) { 684 // no "rare" types 685 super.setEnclosingType(types.erasure(enclosingType)); 686 } else { 687 super.setEnclosingType(types.subst(enclosingType, 688 typeParams, 689 typeArgs)); 690 } 691 } else { 692 super.setEnclosingType(Type.noType); 693 } 694 } 695 return super.getEnclosingType(); 696 } 697 @Override 698 public void setEnclosingType(Type outer) { 699 throw new UnsupportedOperationException(); 700 } 701 }; 702 switch (signature[sigp++]) { 703 case ';': 704 if (sigp < signature.length && signature[sigp] == '.') { 705 // support old-style GJC signatures 706 // The signature produced was 707 // Lfoo/Outer<Lfoo/X;>;.Lfoo/Outer$Inner<Lfoo/Y;>; 708 // rather than say 709 // Lfoo/Outer<Lfoo/X;>.Inner<Lfoo/Y;>; 710 // so we skip past ".Lfoo/Outer$" 711 sigp += (sbp - startSbp) + // "foo/Outer" 712 3; // ".L" and "$" 713 signatureBuffer[sbp++] = (byte)'$'; 714 break; 715 } else { 716 sbp = startSbp; 717 return outer; 718 } 719 case '.': 720 signatureBuffer[sbp++] = (byte)'$'; 721 break; 722 default: 723 throw new AssertionError(signature[sigp-1]); 724 } 725 continue; 726 727 case '.': 728 //we have seen an enclosing non-generic class 729 if (outer != Type.noType) { 730 t = syms.enterClass(names.fromUtf(signatureBuffer, 731 startSbp, 732 sbp - startSbp)); 733 outer = new ClassType(outer, List.<Type>nil(), t, 734 Type.noAnnotations); 735 } 736 signatureBuffer[sbp++] = (byte)'$'; 737 continue; 738 case '/': 739 signatureBuffer[sbp++] = (byte)'.'; 740 continue; 741 default: 742 signatureBuffer[sbp++] = c; 743 continue; 744 } 745 } 746 } 747 748 /** Convert (implicit) signature to list of types 749 * until `terminator' is encountered. 750 */ 751 List<Type> sigToTypes(char terminator) { 752 List<Type> head = List.of(null); 753 List<Type> tail = head; 754 while (signature[sigp] != terminator) 755 tail = tail.setTail(List.of(sigToType())); 756 sigp++; 757 return head.tail; 758 } 759 760 /** Convert signature to type parameters, where signature is a byte 761 * array segment. 762 */ 763 List<Type> sigToTypeParams(byte[] sig, int offset, int len) { 764 signature = sig; 765 sigp = offset; 766 siglimit = offset + len; 767 return sigToTypeParams(); 768 } 769 770 /** Convert signature to type parameters, where signature is implicit. 771 */ 772 List<Type> sigToTypeParams() { 773 List<Type> tvars = List.nil(); 774 if (signature[sigp] == '<') { 775 sigp++; 776 int start = sigp; 777 sigEnterPhase = true; 778 while (signature[sigp] != '>') 779 tvars = tvars.prepend(sigToTypeParam()); 780 sigEnterPhase = false; 781 sigp = start; 782 while (signature[sigp] != '>') 783 sigToTypeParam(); 784 sigp++; 785 } 786 return tvars.reverse(); 787 } 788 789 /** Convert (implicit) signature to type parameter. 790 */ 791 Type sigToTypeParam() { 792 int start = sigp; 793 while (signature[sigp] != ':') sigp++; 794 Name name = names.fromUtf(signature, start, sigp - start); 795 TypeVar tvar; 796 if (sigEnterPhase) { 797 tvar = new TypeVar(name, currentOwner, syms.botType, 798 Type.noAnnotations); 799 typevars.enter(tvar.tsym); 800 } else { 801 tvar = (TypeVar)findTypeVar(name); 802 } 803 List<Type> bounds = List.nil(); 804 boolean allInterfaces = false; 805 if (signature[sigp] == ':' && signature[sigp+1] == ':') { 806 sigp++; 807 allInterfaces = true; 808 } 809 while (signature[sigp] == ':') { 810 sigp++; 811 bounds = bounds.prepend(sigToType()); 812 } 813 if (!sigEnterPhase) { 814 types.setBounds(tvar, bounds.reverse(), allInterfaces); 815 } 816 return tvar; 817 } 818 819 /** Find type variable with given name in `typevars' scope. 820 */ 821 Type findTypeVar(Name name) { 822 Symbol s = typevars.findFirst(name); 823 if (s != null) { 824 return s.type; 825 } else { 826 if (readingClassAttr) { 827 // While reading the class attribute, the supertypes 828 // might refer to a type variable from an enclosing element 829 // (method or class). 830 // If the type variable is defined in the enclosing class, 831 // we can actually find it in 832 // currentOwner.owner.type.getTypeArguments() 833 // However, until we have read the enclosing method attribute 834 // we don't know for sure if this owner is correct. It could 835 // be a method and there is no way to tell before reading the 836 // enclosing method attribute. 837 TypeVar t = new TypeVar(name, currentOwner, syms.botType, 838 Type.noAnnotations); 839 missingTypeVariables = missingTypeVariables.prepend(t); 840 // System.err.println("Missing type var " + name); 841 return t; 842 } 843 throw badClassFile("undecl.type.var", name); 844 } 845 } 846 847/************************************************************************ 848 * Reading Attributes 849 ***********************************************************************/ 850 851 protected enum AttributeKind { CLASS, MEMBER } 852 853 protected abstract class AttributeReader { 854 protected AttributeReader(Name name, ClassFile.Version version, Set<AttributeKind> kinds) { 855 this.name = name; 856 this.version = version; 857 this.kinds = kinds; 858 } 859 860 protected boolean accepts(AttributeKind kind) { 861 if (kinds.contains(kind)) { 862 if (majorVersion > version.major || (majorVersion == version.major && minorVersion >= version.minor)) 863 return true; 864 865 if (lintClassfile && !warnedAttrs.contains(name)) { 866 JavaFileObject prev = log.useSource(currentClassFile); 867 try { 868 log.warning(LintCategory.CLASSFILE, (DiagnosticPosition) null, "future.attr", 869 name, version.major, version.minor, majorVersion, minorVersion); 870 } finally { 871 log.useSource(prev); 872 } 873 warnedAttrs.add(name); 874 } 875 } 876 return false; 877 } 878 879 protected abstract void read(Symbol sym, int attrLen); 880 881 protected final Name name; 882 protected final ClassFile.Version version; 883 protected final Set<AttributeKind> kinds; 884 } 885 886 protected Set<AttributeKind> CLASS_ATTRIBUTE = 887 EnumSet.of(AttributeKind.CLASS); 888 protected Set<AttributeKind> MEMBER_ATTRIBUTE = 889 EnumSet.of(AttributeKind.MEMBER); 890 protected Set<AttributeKind> CLASS_OR_MEMBER_ATTRIBUTE = 891 EnumSet.of(AttributeKind.CLASS, AttributeKind.MEMBER); 892 893 protected Map<Name, AttributeReader> attributeReaders = new HashMap<>(); 894 895 private void initAttributeReaders() { 896 AttributeReader[] readers = { 897 // v45.3 attributes 898 899 new AttributeReader(names.Code, V45_3, MEMBER_ATTRIBUTE) { 900 protected void read(Symbol sym, int attrLen) { 901 if (readAllOfClassFile || saveParameterNames) 902 ((MethodSymbol)sym).code = readCode(sym); 903 else 904 bp = bp + attrLen; 905 } 906 }, 907 908 new AttributeReader(names.ConstantValue, V45_3, MEMBER_ATTRIBUTE) { 909 protected void read(Symbol sym, int attrLen) { 910 Object v = readPool(nextChar()); 911 // Ignore ConstantValue attribute if field not final. 912 if ((sym.flags() & FINAL) != 0) 913 ((VarSymbol) sym).setData(v); 914 } 915 }, 916 917 new AttributeReader(names.Deprecated, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) { 918 protected void read(Symbol sym, int attrLen) { 919 sym.flags_field |= DEPRECATED; 920 } 921 }, 922 923 new AttributeReader(names.Exceptions, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) { 924 protected void read(Symbol sym, int attrLen) { 925 int nexceptions = nextChar(); 926 List<Type> thrown = List.nil(); 927 for (int j = 0; j < nexceptions; j++) 928 thrown = thrown.prepend(readClassSymbol(nextChar()).type); 929 if (sym.type.getThrownTypes().isEmpty()) 930 sym.type.asMethodType().thrown = thrown.reverse(); 931 } 932 }, 933 934 new AttributeReader(names.InnerClasses, V45_3, CLASS_ATTRIBUTE) { 935 protected void read(Symbol sym, int attrLen) { 936 ClassSymbol c = (ClassSymbol) sym; 937 readInnerClasses(c); 938 } 939 }, 940 941 new AttributeReader(names.LocalVariableTable, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) { 942 protected void read(Symbol sym, int attrLen) { 943 int newbp = bp + attrLen; 944 if (saveParameterNames && !sawMethodParameters) { 945 // Pick up parameter names from the variable table. 946 // Parameter names are not explicitly identified as such, 947 // but all parameter name entries in the LocalVariableTable 948 // have a start_pc of 0. Therefore, we record the name 949 // indicies of all slots with a start_pc of zero in the 950 // parameterNameIndicies array. 951 // Note that this implicitly honors the JVMS spec that 952 // there may be more than one LocalVariableTable, and that 953 // there is no specified ordering for the entries. 954 int numEntries = nextChar(); 955 for (int i = 0; i < numEntries; i++) { 956 int start_pc = nextChar(); 957 int length = nextChar(); 958 int nameIndex = nextChar(); 959 int sigIndex = nextChar(); 960 int register = nextChar(); 961 if (start_pc == 0) { 962 // ensure array large enough 963 if (register >= parameterNameIndices.length) { 964 int newSize = Math.max(register, parameterNameIndices.length + 8); 965 parameterNameIndices = 966 Arrays.copyOf(parameterNameIndices, newSize); 967 } 968 parameterNameIndices[register] = nameIndex; 969 haveParameterNameIndices = true; 970 } 971 } 972 } 973 bp = newbp; 974 } 975 }, 976 977 new AttributeReader(names.MethodParameters, V52, MEMBER_ATTRIBUTE) { 978 protected void read(Symbol sym, int attrlen) { 979 int newbp = bp + attrlen; 980 if (saveParameterNames) { 981 sawMethodParameters = true; 982 int numEntries = nextByte(); 983 parameterNameIndices = new int[numEntries]; 984 haveParameterNameIndices = true; 985 for (int i = 0; i < numEntries; i++) { 986 int nameIndex = nextChar(); 987 int flags = nextChar(); 988 parameterNameIndices[i] = nameIndex; 989 } 990 } 991 bp = newbp; 992 } 993 }, 994 995 996 new AttributeReader(names.SourceFile, V45_3, CLASS_ATTRIBUTE) { 997 protected void read(Symbol sym, int attrLen) { 998 ClassSymbol c = (ClassSymbol) sym; 999 Name n = readName(nextChar()); 1000 c.sourcefile = new SourceFileObject(n, c.flatname); 1001 // If the class is a toplevel class, originating from a Java source file, 1002 // but the class name does not match the file name, then it is 1003 // an auxiliary class. 1004 String sn = n.toString(); 1005 if (c.owner.kind == Kinds.PCK && 1006 sn.endsWith(".java") && 1007 !sn.equals(c.name.toString()+".java")) { 1008 c.flags_field |= AUXILIARY; 1009 } 1010 } 1011 }, 1012 1013 new AttributeReader(names.Synthetic, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) { 1014 protected void read(Symbol sym, int attrLen) { 1015 sym.flags_field |= SYNTHETIC; 1016 } 1017 }, 1018 1019 // standard v49 attributes 1020 1021 new AttributeReader(names.EnclosingMethod, V49, CLASS_ATTRIBUTE) { 1022 protected void read(Symbol sym, int attrLen) { 1023 int newbp = bp + attrLen; 1024 readEnclosingMethodAttr(sym); 1025 bp = newbp; 1026 } 1027 }, 1028 1029 new AttributeReader(names.Signature, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1030 protected void read(Symbol sym, int attrLen) { 1031 if (sym.kind == TYP) { 1032 ClassSymbol c = (ClassSymbol) sym; 1033 readingClassAttr = true; 1034 try { 1035 ClassType ct1 = (ClassType)c.type; 1036 Assert.check(c == currentOwner); 1037 ct1.typarams_field = readTypeParams(nextChar()); 1038 ct1.supertype_field = sigToType(); 1039 ListBuffer<Type> is = new ListBuffer<>(); 1040 while (sigp != siglimit) is.append(sigToType()); 1041 ct1.interfaces_field = is.toList(); 1042 } finally { 1043 readingClassAttr = false; 1044 } 1045 } else { 1046 List<Type> thrown = sym.type.getThrownTypes(); 1047 sym.type = readType(nextChar()); 1048 //- System.err.println(" # " + sym.type); 1049 if (sym.kind == MTH && sym.type.getThrownTypes().isEmpty()) 1050 sym.type.asMethodType().thrown = thrown; 1051 1052 } 1053 } 1054 }, 1055 1056 // v49 annotation attributes 1057 1058 new AttributeReader(names.AnnotationDefault, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1059 protected void read(Symbol sym, int attrLen) { 1060 attachAnnotationDefault(sym); 1061 } 1062 }, 1063 1064 new AttributeReader(names.RuntimeInvisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1065 protected void read(Symbol sym, int attrLen) { 1066 attachAnnotations(sym); 1067 } 1068 }, 1069 1070 new AttributeReader(names.RuntimeInvisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1071 protected void read(Symbol sym, int attrLen) { 1072 attachParameterAnnotations(sym); 1073 } 1074 }, 1075 1076 new AttributeReader(names.RuntimeVisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1077 protected void read(Symbol sym, int attrLen) { 1078 attachAnnotations(sym); 1079 } 1080 }, 1081 1082 new AttributeReader(names.RuntimeVisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1083 protected void read(Symbol sym, int attrLen) { 1084 attachParameterAnnotations(sym); 1085 } 1086 }, 1087 1088 // additional "legacy" v49 attributes, superceded by flags 1089 1090 new AttributeReader(names.Annotation, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1091 protected void read(Symbol sym, int attrLen) { 1092 sym.flags_field |= ANNOTATION; 1093 } 1094 }, 1095 1096 new AttributeReader(names.Bridge, V49, MEMBER_ATTRIBUTE) { 1097 protected void read(Symbol sym, int attrLen) { 1098 sym.flags_field |= BRIDGE; 1099 } 1100 }, 1101 1102 new AttributeReader(names.Enum, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1103 protected void read(Symbol sym, int attrLen) { 1104 sym.flags_field |= ENUM; 1105 } 1106 }, 1107 1108 new AttributeReader(names.Varargs, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1109 protected void read(Symbol sym, int attrLen) { 1110 sym.flags_field |= VARARGS; 1111 } 1112 }, 1113 1114 new AttributeReader(names.RuntimeVisibleTypeAnnotations, V52, CLASS_OR_MEMBER_ATTRIBUTE) { 1115 protected void read(Symbol sym, int attrLen) { 1116 attachTypeAnnotations(sym); 1117 } 1118 }, 1119 1120 new AttributeReader(names.RuntimeInvisibleTypeAnnotations, V52, CLASS_OR_MEMBER_ATTRIBUTE) { 1121 protected void read(Symbol sym, int attrLen) { 1122 attachTypeAnnotations(sym); 1123 } 1124 }, 1125 1126 1127 // The following attributes for a Code attribute are not currently handled 1128 // StackMapTable 1129 // SourceDebugExtension 1130 // LineNumberTable 1131 // LocalVariableTypeTable 1132 }; 1133 1134 for (AttributeReader r: readers) 1135 attributeReaders.put(r.name, r); 1136 } 1137 1138 /** Report unrecognized attribute. 1139 */ 1140 void unrecognized(Name attrName) { 1141 if (checkClassFile) 1142 printCCF("ccf.unrecognized.attribute", attrName); 1143 } 1144 1145 1146 1147 protected void readEnclosingMethodAttr(Symbol sym) { 1148 // sym is a nested class with an "Enclosing Method" attribute 1149 // remove sym from it's current owners scope and place it in 1150 // the scope specified by the attribute 1151 sym.owner.members().remove(sym); 1152 ClassSymbol self = (ClassSymbol)sym; 1153 ClassSymbol c = readClassSymbol(nextChar()); 1154 NameAndType nt = readNameAndType(nextChar()); 1155 1156 if (c.members_field == null) 1157 throw badClassFile("bad.enclosing.class", self, c); 1158 1159 MethodSymbol m = findMethod(nt, c.members_field, self.flags()); 1160 if (nt != null && m == null) 1161 throw badClassFile("bad.enclosing.method", self); 1162 1163 self.name = simpleBinaryName(self.flatname, c.flatname) ; 1164 self.owner = m != null ? m : c; 1165 if (self.name.isEmpty()) 1166 self.fullname = names.empty; 1167 else 1168 self.fullname = ClassSymbol.formFullName(self.name, self.owner); 1169 1170 if (m != null) { 1171 ((ClassType)sym.type).setEnclosingType(m.type); 1172 } else if ((self.flags_field & STATIC) == 0) { 1173 ((ClassType)sym.type).setEnclosingType(c.type); 1174 } else { 1175 ((ClassType)sym.type).setEnclosingType(Type.noType); 1176 } 1177 enterTypevars(self); 1178 if (!missingTypeVariables.isEmpty()) { 1179 ListBuffer<Type> typeVars = new ListBuffer<>(); 1180 for (Type typevar : missingTypeVariables) { 1181 typeVars.append(findTypeVar(typevar.tsym.name)); 1182 } 1183 foundTypeVariables = typeVars.toList(); 1184 } else { 1185 foundTypeVariables = List.nil(); 1186 } 1187 } 1188 1189 // See java.lang.Class 1190 private Name simpleBinaryName(Name self, Name enclosing) { 1191 String simpleBinaryName = self.toString().substring(enclosing.toString().length()); 1192 if (simpleBinaryName.length() < 1 || simpleBinaryName.charAt(0) != '$') 1193 throw badClassFile("bad.enclosing.method", self); 1194 int index = 1; 1195 while (index < simpleBinaryName.length() && 1196 isAsciiDigit(simpleBinaryName.charAt(index))) 1197 index++; 1198 return names.fromString(simpleBinaryName.substring(index)); 1199 } 1200 1201 private MethodSymbol findMethod(NameAndType nt, Scope scope, long flags) { 1202 if (nt == null) 1203 return null; 1204 1205 MethodType type = nt.uniqueType.type.asMethodType(); 1206 1207 for (Symbol sym : scope.getSymbolsByName(nt.name)) { 1208 if (sym.kind == MTH && isSameBinaryType(sym.type.asMethodType(), type)) 1209 return (MethodSymbol)sym; 1210 } 1211 1212 if (nt.name != names.init) 1213 // not a constructor 1214 return null; 1215 if ((flags & INTERFACE) != 0) 1216 // no enclosing instance 1217 return null; 1218 if (nt.uniqueType.type.getParameterTypes().isEmpty()) 1219 // no parameters 1220 return null; 1221 1222 // A constructor of an inner class. 1223 // Remove the first argument (the enclosing instance) 1224 nt.setType(new MethodType(nt.uniqueType.type.getParameterTypes().tail, 1225 nt.uniqueType.type.getReturnType(), 1226 nt.uniqueType.type.getThrownTypes(), 1227 syms.methodClass)); 1228 // Try searching again 1229 return findMethod(nt, scope, flags); 1230 } 1231 1232 /** Similar to Types.isSameType but avoids completion */ 1233 private boolean isSameBinaryType(MethodType mt1, MethodType mt2) { 1234 List<Type> types1 = types.erasure(mt1.getParameterTypes()) 1235 .prepend(types.erasure(mt1.getReturnType())); 1236 List<Type> types2 = mt2.getParameterTypes().prepend(mt2.getReturnType()); 1237 while (!types1.isEmpty() && !types2.isEmpty()) { 1238 if (types1.head.tsym != types2.head.tsym) 1239 return false; 1240 types1 = types1.tail; 1241 types2 = types2.tail; 1242 } 1243 return types1.isEmpty() && types2.isEmpty(); 1244 } 1245 1246 /** 1247 * Character.isDigit answers <tt>true</tt> to some non-ascii 1248 * digits. This one does not. <b>copied from java.lang.Class</b> 1249 */ 1250 private static boolean isAsciiDigit(char c) { 1251 return '0' <= c && c <= '9'; 1252 } 1253 1254 /** Read member attributes. 1255 */ 1256 void readMemberAttrs(Symbol sym) { 1257 readAttrs(sym, AttributeKind.MEMBER); 1258 } 1259 1260 void readAttrs(Symbol sym, AttributeKind kind) { 1261 char ac = nextChar(); 1262 for (int i = 0; i < ac; i++) { 1263 Name attrName = readName(nextChar()); 1264 int attrLen = nextInt(); 1265 AttributeReader r = attributeReaders.get(attrName); 1266 if (r != null && r.accepts(kind)) 1267 r.read(sym, attrLen); 1268 else { 1269 unrecognized(attrName); 1270 bp = bp + attrLen; 1271 } 1272 } 1273 } 1274 1275 private boolean readingClassAttr = false; 1276 private List<Type> missingTypeVariables = List.nil(); 1277 private List<Type> foundTypeVariables = List.nil(); 1278 1279 /** Read class attributes. 1280 */ 1281 void readClassAttrs(ClassSymbol c) { 1282 readAttrs(c, AttributeKind.CLASS); 1283 } 1284 1285 /** Read code block. 1286 */ 1287 Code readCode(Symbol owner) { 1288 nextChar(); // max_stack 1289 nextChar(); // max_locals 1290 final int code_length = nextInt(); 1291 bp += code_length; 1292 final char exception_table_length = nextChar(); 1293 bp += exception_table_length * 8; 1294 readMemberAttrs(owner); 1295 return null; 1296 } 1297 1298/************************************************************************ 1299 * Reading Java-language annotations 1300 ***********************************************************************/ 1301 1302 /** Attach annotations. 1303 */ 1304 void attachAnnotations(final Symbol sym) { 1305 int numAttributes = nextChar(); 1306 if (numAttributes != 0) { 1307 ListBuffer<CompoundAnnotationProxy> proxies = new ListBuffer<>(); 1308 for (int i = 0; i<numAttributes; i++) { 1309 CompoundAnnotationProxy proxy = readCompoundAnnotation(); 1310 if (proxy.type.tsym == syms.proprietaryType.tsym) 1311 sym.flags_field |= PROPRIETARY; 1312 else if (proxy.type.tsym == syms.profileType.tsym) { 1313 if (profile != Profile.DEFAULT) { 1314 for (Pair<Name,Attribute> v: proxy.values) { 1315 if (v.fst == names.value && v.snd instanceof Attribute.Constant) { 1316 Attribute.Constant c = (Attribute.Constant) v.snd; 1317 if (c.type == syms.intType && ((Integer) c.value) > profile.value) { 1318 sym.flags_field |= NOT_IN_PROFILE; 1319 } 1320 } 1321 } 1322 } 1323 } else 1324 proxies.append(proxy); 1325 } 1326 annotate.normal(new AnnotationCompleter(sym, proxies.toList())); 1327 } 1328 } 1329 1330 /** Attach parameter annotations. 1331 */ 1332 void attachParameterAnnotations(final Symbol method) { 1333 final MethodSymbol meth = (MethodSymbol)method; 1334 int numParameters = buf[bp++] & 0xFF; 1335 List<VarSymbol> parameters = meth.params(); 1336 int pnum = 0; 1337 while (parameters.tail != null) { 1338 attachAnnotations(parameters.head); 1339 parameters = parameters.tail; 1340 pnum++; 1341 } 1342 if (pnum != numParameters) { 1343 throw badClassFile("bad.runtime.invisible.param.annotations", meth); 1344 } 1345 } 1346 1347 void attachTypeAnnotations(final Symbol sym) { 1348 int numAttributes = nextChar(); 1349 if (numAttributes != 0) { 1350 ListBuffer<TypeAnnotationProxy> proxies = new ListBuffer<>(); 1351 for (int i = 0; i < numAttributes; i++) 1352 proxies.append(readTypeAnnotation()); 1353 annotate.normal(new TypeAnnotationCompleter(sym, proxies.toList())); 1354 } 1355 } 1356 1357 /** Attach the default value for an annotation element. 1358 */ 1359 void attachAnnotationDefault(final Symbol sym) { 1360 final MethodSymbol meth = (MethodSymbol)sym; // only on methods 1361 final Attribute value = readAttributeValue(); 1362 1363 // The default value is set later during annotation. It might 1364 // be the case that the Symbol sym is annotated _after_ the 1365 // repeating instances that depend on this default value, 1366 // because of this we set an interim value that tells us this 1367 // element (most likely) has a default. 1368 // 1369 // Set interim value for now, reset just before we do this 1370 // properly at annotate time. 1371 meth.defaultValue = value; 1372 annotate.normal(new AnnotationDefaultCompleter(meth, value)); 1373 } 1374 1375 Type readTypeOrClassSymbol(int i) { 1376 // support preliminary jsr175-format class files 1377 if (buf[poolIdx[i]] == CONSTANT_Class) 1378 return readClassSymbol(i).type; 1379 return readType(i); 1380 } 1381 Type readEnumType(int i) { 1382 // support preliminary jsr175-format class files 1383 int index = poolIdx[i]; 1384 int length = getChar(index + 1); 1385 if (buf[index + length + 2] != ';') 1386 return syms.enterClass(readName(i)).type; 1387 return readType(i); 1388 } 1389 1390 CompoundAnnotationProxy readCompoundAnnotation() { 1391 Type t = readTypeOrClassSymbol(nextChar()); 1392 int numFields = nextChar(); 1393 ListBuffer<Pair<Name,Attribute>> pairs = new ListBuffer<>(); 1394 for (int i=0; i<numFields; i++) { 1395 Name name = readName(nextChar()); 1396 Attribute value = readAttributeValue(); 1397 pairs.append(new Pair<>(name, value)); 1398 } 1399 return new CompoundAnnotationProxy(t, pairs.toList()); 1400 } 1401 1402 TypeAnnotationProxy readTypeAnnotation() { 1403 TypeAnnotationPosition position = readPosition(); 1404 CompoundAnnotationProxy proxy = readCompoundAnnotation(); 1405 1406 return new TypeAnnotationProxy(proxy, position); 1407 } 1408 1409 TypeAnnotationPosition readPosition() { 1410 int tag = nextByte(); // TargetType tag is a byte 1411 1412 if (!TargetType.isValidTargetTypeValue(tag)) 1413 throw badClassFile("bad.type.annotation.value", String.format("0x%02X", tag)); 1414 1415 TargetType type = TargetType.fromTargetTypeValue(tag); 1416 1417 switch (type) { 1418 // instanceof 1419 case INSTANCEOF: { 1420 final int offset = nextChar(); 1421 final TypeAnnotationPosition position = 1422 TypeAnnotationPosition.instanceOf(readTypePath()); 1423 position.offset = offset; 1424 return position; 1425 } 1426 // new expression 1427 case NEW: { 1428 final int offset = nextChar(); 1429 final TypeAnnotationPosition position = 1430 TypeAnnotationPosition.newObj(readTypePath()); 1431 position.offset = offset; 1432 return position; 1433 } 1434 // constructor/method reference receiver 1435 case CONSTRUCTOR_REFERENCE: { 1436 final int offset = nextChar(); 1437 final TypeAnnotationPosition position = 1438 TypeAnnotationPosition.constructorRef(readTypePath()); 1439 position.offset = offset; 1440 return position; 1441 } 1442 case METHOD_REFERENCE: { 1443 final int offset = nextChar(); 1444 final TypeAnnotationPosition position = 1445 TypeAnnotationPosition.methodRef(readTypePath()); 1446 position.offset = offset; 1447 return position; 1448 } 1449 // local variable 1450 case LOCAL_VARIABLE: { 1451 final int table_length = nextChar(); 1452 final int[] newLvarOffset = new int[table_length]; 1453 final int[] newLvarLength = new int[table_length]; 1454 final int[] newLvarIndex = new int[table_length]; 1455 1456 for (int i = 0; i < table_length; ++i) { 1457 newLvarOffset[i] = nextChar(); 1458 newLvarLength[i] = nextChar(); 1459 newLvarIndex[i] = nextChar(); 1460 } 1461 1462 final TypeAnnotationPosition position = 1463 TypeAnnotationPosition.localVariable(readTypePath()); 1464 position.lvarOffset = newLvarOffset; 1465 position.lvarLength = newLvarLength; 1466 position.lvarIndex = newLvarIndex; 1467 return position; 1468 } 1469 // resource variable 1470 case RESOURCE_VARIABLE: { 1471 final int table_length = nextChar(); 1472 final int[] newLvarOffset = new int[table_length]; 1473 final int[] newLvarLength = new int[table_length]; 1474 final int[] newLvarIndex = new int[table_length]; 1475 1476 for (int i = 0; i < table_length; ++i) { 1477 newLvarOffset[i] = nextChar(); 1478 newLvarLength[i] = nextChar(); 1479 newLvarIndex[i] = nextChar(); 1480 } 1481 1482 final TypeAnnotationPosition position = 1483 TypeAnnotationPosition.resourceVariable(readTypePath()); 1484 position.lvarOffset = newLvarOffset; 1485 position.lvarLength = newLvarLength; 1486 position.lvarIndex = newLvarIndex; 1487 return position; 1488 } 1489 // exception parameter 1490 case EXCEPTION_PARAMETER: { 1491 final int exception_index = nextChar(); 1492 final TypeAnnotationPosition position = 1493 TypeAnnotationPosition.exceptionParameter(readTypePath()); 1494 position.setExceptionIndex(exception_index); 1495 return position; 1496 } 1497 // method receiver 1498 case METHOD_RECEIVER: 1499 return TypeAnnotationPosition.methodReceiver(readTypePath()); 1500 // type parameter 1501 case CLASS_TYPE_PARAMETER: { 1502 final int parameter_index = nextByte(); 1503 return TypeAnnotationPosition 1504 .typeParameter(readTypePath(), parameter_index); 1505 } 1506 case METHOD_TYPE_PARAMETER: { 1507 final int parameter_index = nextByte(); 1508 return TypeAnnotationPosition 1509 .methodTypeParameter(readTypePath(), parameter_index); 1510 } 1511 // type parameter bound 1512 case CLASS_TYPE_PARAMETER_BOUND: { 1513 final int parameter_index = nextByte(); 1514 final int bound_index = nextByte(); 1515 return TypeAnnotationPosition 1516 .typeParameterBound(readTypePath(), parameter_index, 1517 bound_index); 1518 } 1519 case METHOD_TYPE_PARAMETER_BOUND: { 1520 final int parameter_index = nextByte(); 1521 final int bound_index = nextByte(); 1522 return TypeAnnotationPosition 1523 .methodTypeParameterBound(readTypePath(), parameter_index, 1524 bound_index); 1525 } 1526 // class extends or implements clause 1527 case CLASS_EXTENDS: { 1528 final int type_index = nextChar(); 1529 return TypeAnnotationPosition.classExtends(readTypePath(), 1530 type_index); 1531 } 1532 // throws 1533 case THROWS: { 1534 final int type_index = nextChar(); 1535 return TypeAnnotationPosition.methodThrows(readTypePath(), 1536 type_index); 1537 } 1538 // method parameter 1539 case METHOD_FORMAL_PARAMETER: { 1540 final int parameter_index = nextByte(); 1541 return TypeAnnotationPosition.methodParameter(readTypePath(), 1542 parameter_index); 1543 } 1544 // type cast 1545 case CAST: { 1546 final int offset = nextChar(); 1547 final int type_index = nextByte(); 1548 final TypeAnnotationPosition position = 1549 TypeAnnotationPosition.typeCast(readTypePath(), type_index); 1550 position.offset = offset; 1551 return position; 1552 } 1553 // method/constructor/reference type argument 1554 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT: { 1555 final int offset = nextChar(); 1556 final int type_index = nextByte(); 1557 final TypeAnnotationPosition position = TypeAnnotationPosition 1558 .constructorInvocationTypeArg(readTypePath(), type_index); 1559 position.offset = offset; 1560 return position; 1561 } 1562 case METHOD_INVOCATION_TYPE_ARGUMENT: { 1563 final int offset = nextChar(); 1564 final int type_index = nextByte(); 1565 final TypeAnnotationPosition position = TypeAnnotationPosition 1566 .methodInvocationTypeArg(readTypePath(), type_index); 1567 position.offset = offset; 1568 return position; 1569 } 1570 case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT: { 1571 final int offset = nextChar(); 1572 final int type_index = nextByte(); 1573 final TypeAnnotationPosition position = TypeAnnotationPosition 1574 .constructorRefTypeArg(readTypePath(), type_index); 1575 position.offset = offset; 1576 return position; 1577 } 1578 case METHOD_REFERENCE_TYPE_ARGUMENT: { 1579 final int offset = nextChar(); 1580 final int type_index = nextByte(); 1581 final TypeAnnotationPosition position = TypeAnnotationPosition 1582 .methodRefTypeArg(readTypePath(), type_index); 1583 position.offset = offset; 1584 return position; 1585 } 1586 // We don't need to worry about these 1587 case METHOD_RETURN: 1588 return TypeAnnotationPosition.methodReturn(readTypePath()); 1589 case FIELD: 1590 return TypeAnnotationPosition.field(readTypePath()); 1591 case UNKNOWN: 1592 throw new AssertionError("jvm.ClassReader: UNKNOWN target type should never occur!"); 1593 default: 1594 throw new AssertionError("jvm.ClassReader: Unknown target type for position: " + type); 1595 } 1596 } 1597 1598 List<TypeAnnotationPosition.TypePathEntry> readTypePath() { 1599 int len = nextByte(); 1600 ListBuffer<Integer> loc = new ListBuffer<>(); 1601 for (int i = 0; i < len * TypeAnnotationPosition.TypePathEntry.bytesPerEntry; ++i) 1602 loc = loc.append(nextByte()); 1603 1604 return TypeAnnotationPosition.getTypePathFromBinary(loc.toList()); 1605 1606 } 1607 1608 Attribute readAttributeValue() { 1609 char c = (char) buf[bp++]; 1610 switch (c) { 1611 case 'B': 1612 return new Attribute.Constant(syms.byteType, readPool(nextChar())); 1613 case 'C': 1614 return new Attribute.Constant(syms.charType, readPool(nextChar())); 1615 case 'D': 1616 return new Attribute.Constant(syms.doubleType, readPool(nextChar())); 1617 case 'F': 1618 return new Attribute.Constant(syms.floatType, readPool(nextChar())); 1619 case 'I': 1620 return new Attribute.Constant(syms.intType, readPool(nextChar())); 1621 case 'J': 1622 return new Attribute.Constant(syms.longType, readPool(nextChar())); 1623 case 'S': 1624 return new Attribute.Constant(syms.shortType, readPool(nextChar())); 1625 case 'Z': 1626 return new Attribute.Constant(syms.booleanType, readPool(nextChar())); 1627 case 's': 1628 return new Attribute.Constant(syms.stringType, readPool(nextChar()).toString()); 1629 case 'e': 1630 return new EnumAttributeProxy(readEnumType(nextChar()), readName(nextChar())); 1631 case 'c': 1632 return new Attribute.Class(types, readTypeOrClassSymbol(nextChar())); 1633 case '[': { 1634 int n = nextChar(); 1635 ListBuffer<Attribute> l = new ListBuffer<>(); 1636 for (int i=0; i<n; i++) 1637 l.append(readAttributeValue()); 1638 return new ArrayAttributeProxy(l.toList()); 1639 } 1640 case '@': 1641 return readCompoundAnnotation(); 1642 default: 1643 throw new AssertionError("unknown annotation tag '" + c + "'"); 1644 } 1645 } 1646 1647 interface ProxyVisitor extends Attribute.Visitor { 1648 void visitEnumAttributeProxy(EnumAttributeProxy proxy); 1649 void visitArrayAttributeProxy(ArrayAttributeProxy proxy); 1650 void visitCompoundAnnotationProxy(CompoundAnnotationProxy proxy); 1651 } 1652 1653 static class EnumAttributeProxy extends Attribute { 1654 Type enumType; 1655 Name enumerator; 1656 public EnumAttributeProxy(Type enumType, Name enumerator) { 1657 super(null); 1658 this.enumType = enumType; 1659 this.enumerator = enumerator; 1660 } 1661 public void accept(Visitor v) { ((ProxyVisitor)v).visitEnumAttributeProxy(this); } 1662 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1663 public String toString() { 1664 return "/*proxy enum*/" + enumType + "." + enumerator; 1665 } 1666 } 1667 1668 static class ArrayAttributeProxy extends Attribute { 1669 List<Attribute> values; 1670 ArrayAttributeProxy(List<Attribute> values) { 1671 super(null); 1672 this.values = values; 1673 } 1674 public void accept(Visitor v) { ((ProxyVisitor)v).visitArrayAttributeProxy(this); } 1675 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1676 public String toString() { 1677 return "{" + values + "}"; 1678 } 1679 } 1680 1681 /** A temporary proxy representing a compound attribute. 1682 */ 1683 static class CompoundAnnotationProxy extends Attribute { 1684 final List<Pair<Name,Attribute>> values; 1685 public CompoundAnnotationProxy(Type type, 1686 List<Pair<Name,Attribute>> values) { 1687 super(type); 1688 this.values = values; 1689 } 1690 public void accept(Visitor v) { ((ProxyVisitor)v).visitCompoundAnnotationProxy(this); } 1691 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1692 public String toString() { 1693 StringBuilder buf = new StringBuilder(); 1694 buf.append("@"); 1695 buf.append(type.tsym.getQualifiedName()); 1696 buf.append("/*proxy*/{"); 1697 boolean first = true; 1698 for (List<Pair<Name,Attribute>> v = values; 1699 v.nonEmpty(); v = v.tail) { 1700 Pair<Name,Attribute> value = v.head; 1701 if (!first) buf.append(","); 1702 first = false; 1703 buf.append(value.fst); 1704 buf.append("="); 1705 buf.append(value.snd); 1706 } 1707 buf.append("}"); 1708 return buf.toString(); 1709 } 1710 } 1711 1712 /** A temporary proxy representing a type annotation. 1713 */ 1714 static class TypeAnnotationProxy { 1715 final CompoundAnnotationProxy compound; 1716 final TypeAnnotationPosition position; 1717 public TypeAnnotationProxy(CompoundAnnotationProxy compound, 1718 TypeAnnotationPosition position) { 1719 this.compound = compound; 1720 this.position = position; 1721 } 1722 } 1723 1724 class AnnotationDeproxy implements ProxyVisitor { 1725 private ClassSymbol requestingOwner = currentOwner.kind == MTH 1726 ? currentOwner.enclClass() : (ClassSymbol)currentOwner; 1727 1728 List<Attribute.Compound> deproxyCompoundList(List<CompoundAnnotationProxy> pl) { 1729 // also must fill in types!!!! 1730 ListBuffer<Attribute.Compound> buf = new ListBuffer<>(); 1731 for (List<CompoundAnnotationProxy> l = pl; l.nonEmpty(); l=l.tail) { 1732 buf.append(deproxyCompound(l.head)); 1733 } 1734 return buf.toList(); 1735 } 1736 1737 Attribute.Compound deproxyCompound(CompoundAnnotationProxy a) { 1738 ListBuffer<Pair<Symbol.MethodSymbol,Attribute>> buf = new ListBuffer<>(); 1739 for (List<Pair<Name,Attribute>> l = a.values; 1740 l.nonEmpty(); 1741 l = l.tail) { 1742 MethodSymbol meth = findAccessMethod(a.type, l.head.fst); 1743 buf.append(new Pair<>(meth, deproxy(meth.type.getReturnType(), l.head.snd))); 1744 } 1745 return new Attribute.Compound(a.type, buf.toList()); 1746 } 1747 1748 MethodSymbol findAccessMethod(Type container, Name name) { 1749 CompletionFailure failure = null; 1750 try { 1751 for (Symbol sym : container.tsym.members().getSymbolsByName(name)) { 1752 if (sym.kind == MTH && sym.type.getParameterTypes().length() == 0) 1753 return (MethodSymbol) sym; 1754 } 1755 } catch (CompletionFailure ex) { 1756 failure = ex; 1757 } 1758 // The method wasn't found: emit a warning and recover 1759 JavaFileObject prevSource = log.useSource(requestingOwner.classfile); 1760 try { 1761 if (failure == null) { 1762 log.warning("annotation.method.not.found", 1763 container, 1764 name); 1765 } else { 1766 log.warning("annotation.method.not.found.reason", 1767 container, 1768 name, 1769 failure.getDetailValue());//diagnostic, if present 1770 } 1771 } finally { 1772 log.useSource(prevSource); 1773 } 1774 // Construct a new method type and symbol. Use bottom 1775 // type (typeof null) as return type because this type is 1776 // a subtype of all reference types and can be converted 1777 // to primitive types by unboxing. 1778 MethodType mt = new MethodType(List.<Type>nil(), 1779 syms.botType, 1780 List.<Type>nil(), 1781 syms.methodClass); 1782 return new MethodSymbol(PUBLIC | ABSTRACT, name, mt, container.tsym); 1783 } 1784 1785 Attribute result; 1786 Type type; 1787 Attribute deproxy(Type t, Attribute a) { 1788 Type oldType = type; 1789 try { 1790 type = t; 1791 a.accept(this); 1792 return result; 1793 } finally { 1794 type = oldType; 1795 } 1796 } 1797 1798 // implement Attribute.Visitor below 1799 1800 public void visitConstant(Attribute.Constant value) { 1801 // assert value.type == type; 1802 result = value; 1803 } 1804 1805 public void visitClass(Attribute.Class clazz) { 1806 result = clazz; 1807 } 1808 1809 public void visitEnum(Attribute.Enum e) { 1810 throw new AssertionError(); // shouldn't happen 1811 } 1812 1813 public void visitCompound(Attribute.Compound compound) { 1814 throw new AssertionError(); // shouldn't happen 1815 } 1816 1817 public void visitArray(Attribute.Array array) { 1818 throw new AssertionError(); // shouldn't happen 1819 } 1820 1821 public void visitError(Attribute.Error e) { 1822 throw new AssertionError(); // shouldn't happen 1823 } 1824 1825 public void visitEnumAttributeProxy(EnumAttributeProxy proxy) { 1826 // type.tsym.flatName() should == proxy.enumFlatName 1827 TypeSymbol enumTypeSym = proxy.enumType.tsym; 1828 VarSymbol enumerator = null; 1829 CompletionFailure failure = null; 1830 try { 1831 for (Symbol sym : enumTypeSym.members().getSymbolsByName(proxy.enumerator)) { 1832 if (sym.kind == VAR) { 1833 enumerator = (VarSymbol)sym; 1834 break; 1835 } 1836 } 1837 } 1838 catch (CompletionFailure ex) { 1839 failure = ex; 1840 } 1841 if (enumerator == null) { 1842 if (failure != null) { 1843 log.warning("unknown.enum.constant.reason", 1844 currentClassFile, enumTypeSym, proxy.enumerator, 1845 failure.getDiagnostic()); 1846 } else { 1847 log.warning("unknown.enum.constant", 1848 currentClassFile, enumTypeSym, proxy.enumerator); 1849 } 1850 result = new Attribute.Enum(enumTypeSym.type, 1851 new VarSymbol(0, proxy.enumerator, syms.botType, enumTypeSym)); 1852 } else { 1853 result = new Attribute.Enum(enumTypeSym.type, enumerator); 1854 } 1855 } 1856 1857 public void visitArrayAttributeProxy(ArrayAttributeProxy proxy) { 1858 int length = proxy.values.length(); 1859 Attribute[] ats = new Attribute[length]; 1860 Type elemtype = types.elemtype(type); 1861 int i = 0; 1862 for (List<Attribute> p = proxy.values; p.nonEmpty(); p = p.tail) { 1863 ats[i++] = deproxy(elemtype, p.head); 1864 } 1865 result = new Attribute.Array(type, ats); 1866 } 1867 1868 public void visitCompoundAnnotationProxy(CompoundAnnotationProxy proxy) { 1869 result = deproxyCompound(proxy); 1870 } 1871 } 1872 1873 class AnnotationDefaultCompleter extends AnnotationDeproxy implements Annotate.Worker { 1874 final MethodSymbol sym; 1875 final Attribute value; 1876 final JavaFileObject classFile = currentClassFile; 1877 @Override 1878 public String toString() { 1879 return " ClassReader store default for " + sym.owner + "." + sym + " is " + value; 1880 } 1881 AnnotationDefaultCompleter(MethodSymbol sym, Attribute value) { 1882 this.sym = sym; 1883 this.value = value; 1884 } 1885 // implement Annotate.Worker.run() 1886 public void run() { 1887 JavaFileObject previousClassFile = currentClassFile; 1888 try { 1889 // Reset the interim value set earlier in 1890 // attachAnnotationDefault(). 1891 sym.defaultValue = null; 1892 currentClassFile = classFile; 1893 sym.defaultValue = deproxy(sym.type.getReturnType(), value); 1894 } finally { 1895 currentClassFile = previousClassFile; 1896 } 1897 } 1898 } 1899 1900 class AnnotationCompleter extends AnnotationDeproxy implements Annotate.Worker { 1901 final Symbol sym; 1902 final List<CompoundAnnotationProxy> l; 1903 final JavaFileObject classFile; 1904 @Override 1905 public String toString() { 1906 return " ClassReader annotate " + sym.owner + "." + sym + " with " + l; 1907 } 1908 AnnotationCompleter(Symbol sym, List<CompoundAnnotationProxy> l) { 1909 this.sym = sym; 1910 this.l = l; 1911 this.classFile = currentClassFile; 1912 } 1913 // implement Annotate.Worker.run() 1914 public void run() { 1915 JavaFileObject previousClassFile = currentClassFile; 1916 try { 1917 currentClassFile = classFile; 1918 List<Attribute.Compound> newList = deproxyCompoundList(l); 1919 if (sym.annotationsPendingCompletion()) { 1920 sym.setDeclarationAttributes(newList); 1921 } else { 1922 sym.appendAttributes(newList); 1923 } 1924 } finally { 1925 currentClassFile = previousClassFile; 1926 } 1927 } 1928 } 1929 1930 class TypeAnnotationCompleter extends AnnotationCompleter { 1931 1932 List<TypeAnnotationProxy> proxies; 1933 1934 TypeAnnotationCompleter(Symbol sym, 1935 List<TypeAnnotationProxy> proxies) { 1936 super(sym, List.<CompoundAnnotationProxy>nil()); 1937 this.proxies = proxies; 1938 } 1939 1940 List<Attribute.TypeCompound> deproxyTypeCompoundList(List<TypeAnnotationProxy> proxies) { 1941 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>(); 1942 for (TypeAnnotationProxy proxy: proxies) { 1943 Attribute.Compound compound = deproxyCompound(proxy.compound); 1944 Attribute.TypeCompound typeCompound = new Attribute.TypeCompound(compound, proxy.position); 1945 buf.add(typeCompound); 1946 } 1947 return buf.toList(); 1948 } 1949 1950 @Override 1951 public void run() { 1952 JavaFileObject previousClassFile = currentClassFile; 1953 try { 1954 currentClassFile = classFile; 1955 List<Attribute.TypeCompound> newList = deproxyTypeCompoundList(proxies); 1956 sym.setTypeAttributes(newList.prependList(sym.getRawTypeAttributes())); 1957 } finally { 1958 currentClassFile = previousClassFile; 1959 } 1960 } 1961 } 1962 1963 1964/************************************************************************ 1965 * Reading Symbols 1966 ***********************************************************************/ 1967 1968 /** Read a field. 1969 */ 1970 VarSymbol readField() { 1971 long flags = adjustFieldFlags(nextChar()); 1972 Name name = readName(nextChar()); 1973 Type type = readType(nextChar()); 1974 VarSymbol v = new VarSymbol(flags, name, type, currentOwner); 1975 readMemberAttrs(v); 1976 return v; 1977 } 1978 1979 /** Read a method. 1980 */ 1981 MethodSymbol readMethod() { 1982 long flags = adjustMethodFlags(nextChar()); 1983 Name name = readName(nextChar()); 1984 Type type = readType(nextChar()); 1985 if (currentOwner.isInterface() && 1986 (flags & ABSTRACT) == 0 && !name.equals(names.clinit)) { 1987 if (majorVersion > Version.V52.major || 1988 (majorVersion == Version.V52.major && minorVersion >= Version.V52.minor)) { 1989 if ((flags & STATIC) == 0) { 1990 currentOwner.flags_field |= DEFAULT; 1991 flags |= DEFAULT | ABSTRACT; 1992 } 1993 } else { 1994 //protect against ill-formed classfiles 1995 throw badClassFile((flags & STATIC) == 0 ? "invalid.default.interface" : "invalid.static.interface", 1996 Integer.toString(majorVersion), 1997 Integer.toString(minorVersion)); 1998 } 1999 } 2000 if (name == names.init && currentOwner.hasOuterInstance()) { 2001 // Sometimes anonymous classes don't have an outer 2002 // instance, however, there is no reliable way to tell so 2003 // we never strip this$n 2004 if (!currentOwner.name.isEmpty()) 2005 type = new MethodType(adjustMethodParams(flags, type.getParameterTypes()), 2006 type.getReturnType(), 2007 type.getThrownTypes(), 2008 syms.methodClass); 2009 } 2010 MethodSymbol m = new MethodSymbol(flags, name, type, currentOwner); 2011 if (types.isSignaturePolymorphic(m)) { 2012 m.flags_field |= SIGNATURE_POLYMORPHIC; 2013 } 2014 if (saveParameterNames) 2015 initParameterNames(m); 2016 Symbol prevOwner = currentOwner; 2017 currentOwner = m; 2018 try { 2019 readMemberAttrs(m); 2020 } finally { 2021 currentOwner = prevOwner; 2022 } 2023 if (saveParameterNames) 2024 setParameterNames(m, type); 2025 return m; 2026 } 2027 2028 private List<Type> adjustMethodParams(long flags, List<Type> args) { 2029 boolean isVarargs = (flags & VARARGS) != 0; 2030 if (isVarargs) { 2031 Type varargsElem = args.last(); 2032 ListBuffer<Type> adjustedArgs = new ListBuffer<>(); 2033 for (Type t : args) { 2034 adjustedArgs.append(t != varargsElem ? 2035 t : 2036 ((ArrayType)t).makeVarargs()); 2037 } 2038 args = adjustedArgs.toList(); 2039 } 2040 return args.tail; 2041 } 2042 2043 /** 2044 * Init the parameter names array. 2045 * Parameter names are currently inferred from the names in the 2046 * LocalVariableTable attributes of a Code attribute. 2047 * (Note: this means parameter names are currently not available for 2048 * methods without a Code attribute.) 2049 * This method initializes an array in which to store the name indexes 2050 * of parameter names found in LocalVariableTable attributes. It is 2051 * slightly supersized to allow for additional slots with a start_pc of 0. 2052 */ 2053 void initParameterNames(MethodSymbol sym) { 2054 // make allowance for synthetic parameters. 2055 final int excessSlots = 4; 2056 int expectedParameterSlots = 2057 Code.width(sym.type.getParameterTypes()) + excessSlots; 2058 if (parameterNameIndices == null 2059 || parameterNameIndices.length < expectedParameterSlots) { 2060 parameterNameIndices = new int[expectedParameterSlots]; 2061 } else 2062 Arrays.fill(parameterNameIndices, 0); 2063 haveParameterNameIndices = false; 2064 sawMethodParameters = false; 2065 } 2066 2067 /** 2068 * Set the parameter names for a symbol from the name index in the 2069 * parameterNameIndicies array. The type of the symbol may have changed 2070 * while reading the method attributes (see the Signature attribute). 2071 * This may be because of generic information or because anonymous 2072 * synthetic parameters were added. The original type (as read from 2073 * the method descriptor) is used to help guess the existence of 2074 * anonymous synthetic parameters. 2075 * On completion, sym.savedParameter names will either be null (if 2076 * no parameter names were found in the class file) or will be set to a 2077 * list of names, one per entry in sym.type.getParameterTypes, with 2078 * any missing names represented by the empty name. 2079 */ 2080 void setParameterNames(MethodSymbol sym, Type jvmType) { 2081 // if no names were found in the class file, there's nothing more to do 2082 if (!haveParameterNameIndices) 2083 return; 2084 // If we get parameter names from MethodParameters, then we 2085 // don't need to skip. 2086 int firstParam = 0; 2087 if (!sawMethodParameters) { 2088 firstParam = ((sym.flags() & STATIC) == 0) ? 1 : 0; 2089 // the code in readMethod may have skipped the first 2090 // parameter when setting up the MethodType. If so, we 2091 // make a corresponding allowance here for the position of 2092 // the first parameter. Note that this assumes the 2093 // skipped parameter has a width of 1 -- i.e. it is not 2094 // a double width type (long or double.) 2095 if (sym.name == names.init && currentOwner.hasOuterInstance()) { 2096 // Sometimes anonymous classes don't have an outer 2097 // instance, however, there is no reliable way to tell so 2098 // we never strip this$n 2099 if (!currentOwner.name.isEmpty()) 2100 firstParam += 1; 2101 } 2102 2103 if (sym.type != jvmType) { 2104 // reading the method attributes has caused the 2105 // symbol's type to be changed. (i.e. the Signature 2106 // attribute.) This may happen if there are hidden 2107 // (synthetic) parameters in the descriptor, but not 2108 // in the Signature. The position of these hidden 2109 // parameters is unspecified; for now, assume they are 2110 // at the beginning, and so skip over them. The 2111 // primary case for this is two hidden parameters 2112 // passed into Enum constructors. 2113 int skip = Code.width(jvmType.getParameterTypes()) 2114 - Code.width(sym.type.getParameterTypes()); 2115 firstParam += skip; 2116 } 2117 } 2118 List<Name> paramNames = List.nil(); 2119 int index = firstParam; 2120 for (Type t: sym.type.getParameterTypes()) { 2121 int nameIdx = (index < parameterNameIndices.length 2122 ? parameterNameIndices[index] : 0); 2123 Name name = nameIdx == 0 ? names.empty : readName(nameIdx); 2124 paramNames = paramNames.prepend(name); 2125 index += Code.width(t); 2126 } 2127 sym.savedParameterNames = paramNames.reverse(); 2128 } 2129 2130 /** 2131 * skip n bytes 2132 */ 2133 void skipBytes(int n) { 2134 bp = bp + n; 2135 } 2136 2137 /** Skip a field or method 2138 */ 2139 void skipMember() { 2140 bp = bp + 6; 2141 char ac = nextChar(); 2142 for (int i = 0; i < ac; i++) { 2143 bp = bp + 2; 2144 int attrLen = nextInt(); 2145 bp = bp + attrLen; 2146 } 2147 } 2148 2149 /** Enter type variables of this classtype and all enclosing ones in 2150 * `typevars'. 2151 */ 2152 protected void enterTypevars(Type t) { 2153 if (t.getEnclosingType() != null && t.getEnclosingType().hasTag(CLASS)) 2154 enterTypevars(t.getEnclosingType()); 2155 for (List<Type> xs = t.getTypeArguments(); xs.nonEmpty(); xs = xs.tail) 2156 typevars.enter(xs.head.tsym); 2157 } 2158 2159 protected void enterTypevars(Symbol sym) { 2160 if (sym.owner.kind == MTH) { 2161 enterTypevars(sym.owner); 2162 enterTypevars(sym.owner.owner); 2163 } 2164 enterTypevars(sym.type); 2165 } 2166 2167 /** Read contents of a given class symbol `c'. Both external and internal 2168 * versions of an inner class are read. 2169 */ 2170 void readClass(ClassSymbol c) { 2171 ClassType ct = (ClassType)c.type; 2172 2173 // allocate scope for members 2174 c.members_field = WriteableScope.create(c); 2175 2176 // prepare type variable table 2177 typevars = typevars.dup(currentOwner); 2178 if (ct.getEnclosingType().hasTag(CLASS)) 2179 enterTypevars(ct.getEnclosingType()); 2180 2181 // read flags, or skip if this is an inner class 2182 long flags = adjustClassFlags(nextChar()); 2183 if (c.owner.kind == PCK) c.flags_field = flags; 2184 2185 // read own class name and check that it matches 2186 ClassSymbol self = readClassSymbol(nextChar()); 2187 if (c != self) 2188 throw badClassFile("class.file.wrong.class", 2189 self.flatname); 2190 2191 // class attributes must be read before class 2192 // skip ahead to read class attributes 2193 int startbp = bp; 2194 nextChar(); 2195 char interfaceCount = nextChar(); 2196 bp += interfaceCount * 2; 2197 char fieldCount = nextChar(); 2198 for (int i = 0; i < fieldCount; i++) skipMember(); 2199 char methodCount = nextChar(); 2200 for (int i = 0; i < methodCount; i++) skipMember(); 2201 readClassAttrs(c); 2202 2203 if (readAllOfClassFile) { 2204 for (int i = 1; i < poolObj.length; i++) readPool(i); 2205 c.pool = new Pool(poolObj.length, poolObj, types); 2206 } 2207 2208 // reset and read rest of classinfo 2209 bp = startbp; 2210 int n = nextChar(); 2211 if (ct.supertype_field == null) 2212 ct.supertype_field = (n == 0) 2213 ? Type.noType 2214 : readClassSymbol(n).erasure(types); 2215 n = nextChar(); 2216 List<Type> is = List.nil(); 2217 for (int i = 0; i < n; i++) { 2218 Type _inter = readClassSymbol(nextChar()).erasure(types); 2219 is = is.prepend(_inter); 2220 } 2221 if (ct.interfaces_field == null) 2222 ct.interfaces_field = is.reverse(); 2223 2224 Assert.check(fieldCount == nextChar()); 2225 for (int i = 0; i < fieldCount; i++) enterMember(c, readField()); 2226 Assert.check(methodCount == nextChar()); 2227 for (int i = 0; i < methodCount; i++) enterMember(c, readMethod()); 2228 2229 typevars = typevars.leave(); 2230 } 2231 2232 /** Read inner class info. For each inner/outer pair allocate a 2233 * member class. 2234 */ 2235 void readInnerClasses(ClassSymbol c) { 2236 int n = nextChar(); 2237 for (int i = 0; i < n; i++) { 2238 nextChar(); // skip inner class symbol 2239 ClassSymbol outer = readClassSymbol(nextChar()); 2240 Name name = readName(nextChar()); 2241 if (name == null) name = names.empty; 2242 long flags = adjustClassFlags(nextChar()); 2243 if (outer != null) { // we have a member class 2244 if (name == names.empty) 2245 name = names.one; 2246 ClassSymbol member = syms.enterClass(name, outer); 2247 if ((flags & STATIC) == 0) { 2248 ((ClassType)member.type).setEnclosingType(outer.type); 2249 if (member.erasure_field != null) 2250 ((ClassType)member.erasure_field).setEnclosingType(types.erasure(outer.type)); 2251 } 2252 if (c == outer) { 2253 member.flags_field = flags; 2254 enterMember(c, member); 2255 } 2256 } 2257 } 2258 } 2259 2260 /** Read a class definition from the bytes in buf. 2261 */ 2262 private void readClassBuffer(ClassSymbol c) throws IOException { 2263 int magic = nextInt(); 2264 if (magic != JAVA_MAGIC) 2265 throw badClassFile("illegal.start.of.class.file"); 2266 2267 minorVersion = nextChar(); 2268 majorVersion = nextChar(); 2269 int maxMajor = Version.MAX().major; 2270 int maxMinor = Version.MAX().minor; 2271 if (majorVersion > maxMajor || 2272 majorVersion * 1000 + minorVersion < 2273 Version.MIN().major * 1000 + Version.MIN().minor) 2274 { 2275 if (majorVersion == (maxMajor + 1)) 2276 log.warning("big.major.version", 2277 currentClassFile, 2278 majorVersion, 2279 maxMajor); 2280 else 2281 throw badClassFile("wrong.version", 2282 Integer.toString(majorVersion), 2283 Integer.toString(minorVersion), 2284 Integer.toString(maxMajor), 2285 Integer.toString(maxMinor)); 2286 } 2287 else if (checkClassFile && 2288 majorVersion == maxMajor && 2289 minorVersion > maxMinor) 2290 { 2291 printCCF("found.later.version", 2292 Integer.toString(minorVersion)); 2293 } 2294 indexPool(); 2295 if (signatureBuffer.length < bp) { 2296 int ns = Integer.highestOneBit(bp) << 1; 2297 signatureBuffer = new byte[ns]; 2298 } 2299 readClass(c); 2300 } 2301 2302 public void readClassFile(ClassSymbol c) { 2303 currentOwner = c; 2304 currentClassFile = c.classfile; 2305 warnedAttrs.clear(); 2306 filling = true; 2307 try { 2308 bp = 0; 2309 buf = readInputStream(buf, c.classfile.openInputStream()); 2310 readClassBuffer(c); 2311 if (!missingTypeVariables.isEmpty() && !foundTypeVariables.isEmpty()) { 2312 List<Type> missing = missingTypeVariables; 2313 List<Type> found = foundTypeVariables; 2314 missingTypeVariables = List.nil(); 2315 foundTypeVariables = List.nil(); 2316 filling = false; 2317 ClassType ct = (ClassType)currentOwner.type; 2318 ct.supertype_field = 2319 types.subst(ct.supertype_field, missing, found); 2320 ct.interfaces_field = 2321 types.subst(ct.interfaces_field, missing, found); 2322 } else if (missingTypeVariables.isEmpty() != 2323 foundTypeVariables.isEmpty()) { 2324 Name name = missingTypeVariables.head.tsym.name; 2325 throw badClassFile("undecl.type.var", name); 2326 } 2327 } catch (IOException ex) { 2328 throw badClassFile("unable.to.access.file", ex.getMessage()); 2329 } catch (ArrayIndexOutOfBoundsException ex) { 2330 throw badClassFile("bad.class.file", c.flatname); 2331 } finally { 2332 missingTypeVariables = List.nil(); 2333 foundTypeVariables = List.nil(); 2334 filling = false; 2335 } 2336 } 2337 // where 2338 private static byte[] readInputStream(byte[] buf, InputStream s) throws IOException { 2339 try { 2340 buf = ensureCapacity(buf, s.available()); 2341 int r = s.read(buf); 2342 int bp = 0; 2343 while (r != -1) { 2344 bp += r; 2345 buf = ensureCapacity(buf, bp); 2346 r = s.read(buf, bp, buf.length - bp); 2347 } 2348 return buf; 2349 } finally { 2350 try { 2351 s.close(); 2352 } catch (IOException e) { 2353 /* Ignore any errors, as this stream may have already 2354 * thrown a related exception which is the one that 2355 * should be reported. 2356 */ 2357 } 2358 } 2359 } 2360 /* 2361 * ensureCapacity will increase the buffer as needed, taking note that 2362 * the new buffer will always be greater than the needed and never 2363 * exactly equal to the needed size or bp. If equal then the read (above) 2364 * will infinitely loop as buf.length - bp == 0. 2365 */ 2366 private static byte[] ensureCapacity(byte[] buf, int needed) { 2367 if (buf.length <= needed) { 2368 byte[] old = buf; 2369 buf = new byte[Integer.highestOneBit(needed) << 1]; 2370 System.arraycopy(old, 0, buf, 0, old.length); 2371 } 2372 return buf; 2373 } 2374 2375 /** We can only read a single class file at a time; this 2376 * flag keeps track of when we are currently reading a class 2377 * file. 2378 */ 2379 public boolean filling = false; 2380 2381/************************************************************************ 2382 * Adjusting flags 2383 ***********************************************************************/ 2384 2385 long adjustFieldFlags(long flags) { 2386 return flags; 2387 } 2388 2389 long adjustMethodFlags(long flags) { 2390 if ((flags & ACC_BRIDGE) != 0) { 2391 flags &= ~ACC_BRIDGE; 2392 flags |= BRIDGE; 2393 } 2394 if ((flags & ACC_VARARGS) != 0) { 2395 flags &= ~ACC_VARARGS; 2396 flags |= VARARGS; 2397 } 2398 return flags; 2399 } 2400 2401 long adjustClassFlags(long flags) { 2402 return flags & ~ACC_SUPER; // SUPER and SYNCHRONIZED bits overloaded 2403 } 2404 2405 /** Output for "-checkclassfile" option. 2406 * @param key The key to look up the correct internationalized string. 2407 * @param arg An argument for substitution into the output string. 2408 */ 2409 private void printCCF(String key, Object arg) { 2410 log.printLines(key, arg); 2411 } 2412 2413 /** 2414 * A subclass of JavaFileObject for the sourcefile attribute found in a classfile. 2415 * The attribute is only the last component of the original filename, so is unlikely 2416 * to be valid as is, so operations other than those to access the name throw 2417 * UnsupportedOperationException 2418 */ 2419 private static class SourceFileObject extends BaseFileObject { 2420 2421 /** The file's name. 2422 */ 2423 private Name name; 2424 private Name flatname; 2425 2426 public SourceFileObject(Name name, Name flatname) { 2427 super(null); // no file manager; never referenced for this file object 2428 this.name = name; 2429 this.flatname = flatname; 2430 } 2431 2432 @Override @DefinedBy(Api.COMPILER) 2433 public URI toUri() { 2434 try { 2435 return new URI(null, name.toString(), null); 2436 } catch (URISyntaxException e) { 2437 throw new CannotCreateUriError(name.toString(), e); 2438 } 2439 } 2440 2441 @Override @DefinedBy(Api.COMPILER) 2442 public String getName() { 2443 return name.toString(); 2444 } 2445 2446 @Override 2447 public String getShortName() { 2448 return getName(); 2449 } 2450 2451 @Override @DefinedBy(Api.COMPILER) 2452 public JavaFileObject.Kind getKind() { 2453 return getKind(getName()); 2454 } 2455 2456 @Override @DefinedBy(Api.COMPILER) 2457 public InputStream openInputStream() { 2458 throw new UnsupportedOperationException(); 2459 } 2460 2461 @Override @DefinedBy(Api.COMPILER) 2462 public OutputStream openOutputStream() { 2463 throw new UnsupportedOperationException(); 2464 } 2465 2466 @Override @DefinedBy(Api.COMPILER) 2467 public CharBuffer getCharContent(boolean ignoreEncodingErrors) { 2468 throw new UnsupportedOperationException(); 2469 } 2470 2471 @Override @DefinedBy(Api.COMPILER) 2472 public Reader openReader(boolean ignoreEncodingErrors) { 2473 throw new UnsupportedOperationException(); 2474 } 2475 2476 @Override @DefinedBy(Api.COMPILER) 2477 public Writer openWriter() { 2478 throw new UnsupportedOperationException(); 2479 } 2480 2481 @Override @DefinedBy(Api.COMPILER) 2482 public long getLastModified() { 2483 throw new UnsupportedOperationException(); 2484 } 2485 2486 @Override @DefinedBy(Api.COMPILER) 2487 public boolean delete() { 2488 throw new UnsupportedOperationException(); 2489 } 2490 2491 @Override 2492 protected String inferBinaryName(Iterable<? extends File> path) { 2493 return flatname.toString(); 2494 } 2495 2496 @Override @DefinedBy(Api.COMPILER) 2497 public boolean isNameCompatible(String simpleName, JavaFileObject.Kind kind) { 2498 return true; // fail-safe mode 2499 } 2500 2501 /** 2502 * Check if two file objects are equal. 2503 * SourceFileObjects are just placeholder objects for the value of a 2504 * SourceFile attribute, and do not directly represent specific files. 2505 * Two SourceFileObjects are equal if their names are equal. 2506 */ 2507 @Override 2508 public boolean equals(Object other) { 2509 if (this == other) 2510 return true; 2511 2512 if (!(other instanceof SourceFileObject)) 2513 return false; 2514 2515 SourceFileObject o = (SourceFileObject) other; 2516 return name.equals(o.name); 2517 } 2518 2519 @Override 2520 public int hashCode() { 2521 return name.hashCode(); 2522 } 2523 } 2524} 2525