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