1 /* 2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 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 import javax.tools.JavaFileManager; 40 import javax.tools.JavaFileObject; 41 import com.sun.tools.javac.comp.Annotate; 42 import com.sun.tools.javac.comp.Annotate.AnnotationTypeCompleter; 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.AnnotationTypeMetadata; 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.ARRAY; 60 import static com.sun.tools.javac.code.TypeTag.CLASS; 61 import static com.sun.tools.javac.code.TypeTag.TYPEVAR; 62 import static com.sun.tools.javac.jvm.ClassFile.*; 63 import static com.sun.tools.javac.jvm.ClassFile.Version.*; 64 65 import static com.sun.tools.javac.main.Option.*; 66 67 /** This class provides operations to read a classfile into an internal 68 * representation. The internal representation is anchored in a 69 * ClassSymbol which contains in its scope symbol representations 70 * for all other definitions in the classfile. Top-level Classes themselves 71 * appear as members of the scopes of PackageSymbols. 72 * 73 * <p><b>This is NOT part of any supported API. 74 * If you write code that depends on this, you do so at your own risk. 75 * This code and its internal interfaces are subject to change or 76 * deletion without notice.</b> 77 */ 78 public class ClassReader { 79 /** The context key for the class reader. */ 80 protected static final Context.Key<ClassReader> classReaderKey = new Context.Key<>(); 81 82 public static final int INITIAL_BUFFER_SIZE = 0x0fff0; 83 84 private final Annotate annotate; 85 86 /** Switch: verbose output. 87 */ 88 boolean verbose; 89 90 /** Switch: check class file for correct minor version, unrecognized 91 * attributes. 92 */ 93 boolean checkClassFile; 94 95 /** Switch: read constant pool and code sections. This switch is initially 96 * set to false but can be turned on from outside. 97 */ 98 public boolean readAllOfClassFile = false; 99 100 /** Switch: allow simplified varargs. 101 */ 102 boolean allowSimplifiedVarargs; 103 104 /** Lint option: warn about classfile issues 105 */ 106 boolean lintClassfile; 107 108 /** Switch: preserve parameter names from the variable table. 109 */ 110 public boolean saveParameterNames; 111 112 /** 113 * The currently selected profile. 114 */ 115 public final Profile profile; 116 117 /** The log to use for verbose output 118 */ 119 final Log log; 120 121 /** The symbol table. */ 122 Symtab syms; 123 124 Types types; 125 126 /** The name table. */ 127 final Names names; 128 129 /** Access to files 130 */ 131 private final JavaFileManager fileManager; 132 133 /** Factory for diagnostics 134 */ 135 JCDiagnostic.Factory diagFactory; 136 137 /** The current scope where type variables are entered. 138 */ 139 protected WriteableScope typevars; 140 141 /** The path name of the class file currently being read. 142 */ 143 protected JavaFileObject currentClassFile = null; 144 145 /** The class or method currently being read. 146 */ 147 protected Symbol currentOwner = null; 148 149 /** The buffer containing the currently read class file. 150 */ 151 byte[] buf = new byte[INITIAL_BUFFER_SIZE]; 152 153 /** The current input pointer. 154 */ 155 protected int bp; 156 157 /** The objects of the constant pool. 158 */ 159 Object[] poolObj; 160 161 /** For every constant pool entry, an index into buf where the 162 * defining section of the entry is found. 163 */ 164 int[] poolIdx; 165 166 /** The major version number of the class file being read. */ 167 int majorVersion; 168 /** The minor version number of the class file being read. */ 169 int minorVersion; 170 171 /** A table to hold the constant pool indices for method parameter 172 * names, as given in LocalVariableTable attributes. 173 */ 174 int[] parameterNameIndices; 175 176 /** 177 * Whether or not any parameter names have been found. 178 */ 179 boolean haveParameterNameIndices; 180 181 /** Set this to false every time we start reading a method 182 * and are saving parameter names. Set it to true when we see 183 * MethodParameters, if it's set when we see a LocalVariableTable, 184 * then we ignore the parameter names from the LVT. 185 */ 186 boolean sawMethodParameters; 187 188 /** 189 * The set of attribute names for which warnings have been generated for the current class 190 */ 191 Set<Name> warnedAttrs = new HashSet<>(); 192 193 /** 194 * The prototype @Target Attribute.Compound if this class is an annotation annotated with 195 * @Target 196 */ 197 CompoundAnnotationProxy target; 198 199 /** 200 * The prototype @Repetable Attribute.Compound if this class is an annotation annotated with 201 * @Repeatable 202 */ 203 CompoundAnnotationProxy repeatable; 204 205 /** Get the ClassReader instance for this invocation. */ 206 public static ClassReader instance(Context context) { 207 ClassReader instance = context.get(classReaderKey); 208 if (instance == null) 209 instance = new ClassReader(context); 210 return instance; 211 } 212 213 /** Construct a new class reader. */ 214 protected ClassReader(Context context) { 215 context.put(classReaderKey, this); 216 annotate = Annotate.instance(context); 217 names = Names.instance(context); 218 syms = Symtab.instance(context); 219 types = Types.instance(context); 220 fileManager = context.get(JavaFileManager.class); 221 if (fileManager == null) 222 throw new AssertionError("FileManager initialization error"); 223 diagFactory = JCDiagnostic.Factory.instance(context); 224 225 log = Log.instance(context); 226 227 Options options = Options.instance(context); 228 verbose = options.isSet(VERBOSE); 229 checkClassFile = options.isSet("-checkclassfile"); 230 231 Source source = Source.instance(context); 232 allowSimplifiedVarargs = source.allowSimplifiedVarargs(); 233 234 saveParameterNames = options.isSet("save-parameter-names"); 235 236 profile = Profile.instance(context); 237 238 typevars = WriteableScope.create(syms.noSymbol); 239 240 lintClassfile = Lint.instance(context).isEnabled(LintCategory.CLASSFILE); 241 242 initAttributeReaders(); 243 } 244 245 /** Add member to class unless it is synthetic. 246 */ 247 private void enterMember(ClassSymbol c, Symbol sym) { 248 // Synthetic members are not entered -- reason lost to history (optimization?). 249 // Lambda methods must be entered because they may have inner classes (which reference them) 250 if ((sym.flags_field & (SYNTHETIC|BRIDGE)) != SYNTHETIC || sym.name.startsWith(names.lambda)) 251 c.members_field.enter(sym); 252 } 253 254 /************************************************************************ 255 * Error Diagnoses 256 ***********************************************************************/ 257 258 public ClassFinder.BadClassFile badClassFile(String key, Object... args) { 259 return new ClassFinder.BadClassFile ( 260 currentOwner.enclClass(), 261 currentClassFile, 262 diagFactory.fragment(key, args), 263 diagFactory); 264 } 265 266 /************************************************************************ 267 * Buffer Access 268 ***********************************************************************/ 269 270 /** Read a character. 271 */ 272 char nextChar() { 273 return (char)(((buf[bp++] & 0xFF) << 8) + (buf[bp++] & 0xFF)); 274 } 275 276 /** Read a byte. 277 */ 278 int nextByte() { 279 return buf[bp++] & 0xFF; 280 } 281 282 /** Read an integer. 283 */ 284 int nextInt() { 285 return 286 ((buf[bp++] & 0xFF) << 24) + 287 ((buf[bp++] & 0xFF) << 16) + 288 ((buf[bp++] & 0xFF) << 8) + 289 (buf[bp++] & 0xFF); 290 } 291 292 /** Extract a character at position bp from buf. 293 */ 294 char getChar(int bp) { 295 return 296 (char)(((buf[bp] & 0xFF) << 8) + (buf[bp+1] & 0xFF)); 297 } 298 299 /** Extract an integer at position bp from buf. 300 */ 301 int getInt(int bp) { 302 return 303 ((buf[bp] & 0xFF) << 24) + 304 ((buf[bp+1] & 0xFF) << 16) + 305 ((buf[bp+2] & 0xFF) << 8) + 306 (buf[bp+3] & 0xFF); 307 } 308 309 310 /** Extract a long integer at position bp from buf. 311 */ 312 long getLong(int bp) { 313 DataInputStream bufin = 314 new DataInputStream(new ByteArrayInputStream(buf, bp, 8)); 315 try { 316 return bufin.readLong(); 317 } catch (IOException e) { 318 throw new AssertionError(e); 319 } 320 } 321 322 /** Extract a float at position bp from buf. 323 */ 324 float getFloat(int bp) { 325 DataInputStream bufin = 326 new DataInputStream(new ByteArrayInputStream(buf, bp, 4)); 327 try { 328 return bufin.readFloat(); 329 } catch (IOException e) { 330 throw new AssertionError(e); 331 } 332 } 333 334 /** Extract a double at position bp from buf. 335 */ 336 double getDouble(int bp) { 337 DataInputStream bufin = 338 new DataInputStream(new ByteArrayInputStream(buf, bp, 8)); 339 try { 340 return bufin.readDouble(); 341 } catch (IOException e) { 342 throw new AssertionError(e); 343 } 344 } 345 346 /************************************************************************ 347 * Constant Pool Access 348 ***********************************************************************/ 349 350 /** Index all constant pool entries, writing their start addresses into 351 * poolIdx. 352 */ 353 void indexPool() { 354 poolIdx = new int[nextChar()]; 355 poolObj = new Object[poolIdx.length]; 356 int i = 1; 357 while (i < poolIdx.length) { 358 poolIdx[i++] = bp; 359 byte tag = buf[bp++]; 360 switch (tag) { 361 case CONSTANT_Utf8: case CONSTANT_Unicode: { 362 int len = nextChar(); 363 bp = bp + len; 364 break; 365 } 366 case CONSTANT_Class: 367 case CONSTANT_String: 368 case CONSTANT_MethodType: 369 bp = bp + 2; 370 break; 371 case CONSTANT_MethodHandle: 372 bp = bp + 3; 373 break; 374 case CONSTANT_Fieldref: 375 case CONSTANT_Methodref: 376 case CONSTANT_InterfaceMethodref: 377 case CONSTANT_NameandType: 378 case CONSTANT_Integer: 379 case CONSTANT_Float: 380 case CONSTANT_InvokeDynamic: 381 bp = bp + 4; 382 break; 383 case CONSTANT_Long: 384 case CONSTANT_Double: 385 bp = bp + 8; 386 i++; 387 break; 388 default: 389 throw badClassFile("bad.const.pool.tag.at", 390 Byte.toString(tag), 391 Integer.toString(bp -1)); 392 } 393 } 394 } 395 396 /** Read constant pool entry at start address i, use pool as a cache. 397 */ 398 Object readPool(int i) { 399 Object result = poolObj[i]; 400 if (result != null) return result; 401 402 int index = poolIdx[i]; 403 if (index == 0) return null; 404 405 byte tag = buf[index]; 406 switch (tag) { 407 case CONSTANT_Utf8: 408 poolObj[i] = names.fromUtf(buf, index + 3, getChar(index + 1)); 409 break; 410 case CONSTANT_Unicode: 411 throw badClassFile("unicode.str.not.supported"); 412 case CONSTANT_Class: 413 poolObj[i] = readClassOrType(getChar(index + 1)); 414 break; 415 case CONSTANT_String: 416 // FIXME: (footprint) do not use toString here 417 poolObj[i] = readName(getChar(index + 1)).toString(); 418 break; 419 case CONSTANT_Fieldref: { 420 ClassSymbol owner = readClassSymbol(getChar(index + 1)); 421 NameAndType nt = readNameAndType(getChar(index + 3)); 422 poolObj[i] = new VarSymbol(0, nt.name, nt.uniqueType.type, owner); 423 break; 424 } 425 case CONSTANT_Methodref: 426 case CONSTANT_InterfaceMethodref: { 427 ClassSymbol owner = readClassSymbol(getChar(index + 1)); 428 NameAndType nt = readNameAndType(getChar(index + 3)); 429 poolObj[i] = new MethodSymbol(0, nt.name, nt.uniqueType.type, owner); 430 break; 431 } 432 case CONSTANT_NameandType: 433 poolObj[i] = new NameAndType( 434 readName(getChar(index + 1)), 435 readType(getChar(index + 3)), types); 436 break; 437 case CONSTANT_Integer: 438 poolObj[i] = getInt(index + 1); 439 break; 440 case CONSTANT_Float: 441 poolObj[i] = new Float(getFloat(index + 1)); 442 break; 443 case CONSTANT_Long: 444 poolObj[i] = new Long(getLong(index + 1)); 445 break; 446 case CONSTANT_Double: 447 poolObj[i] = new Double(getDouble(index + 1)); 448 break; 449 case CONSTANT_MethodHandle: 450 skipBytes(4); 451 break; 452 case CONSTANT_MethodType: 453 skipBytes(3); 454 break; 455 case CONSTANT_InvokeDynamic: 456 skipBytes(5); 457 break; 458 default: 459 throw badClassFile("bad.const.pool.tag", Byte.toString(tag)); 460 } 461 return poolObj[i]; 462 } 463 464 /** Read signature and convert to type. 465 */ 466 Type readType(int i) { 467 int index = poolIdx[i]; 468 return sigToType(buf, index + 3, getChar(index + 1)); 469 } 470 471 /** If name is an array type or class signature, return the 472 * corresponding type; otherwise return a ClassSymbol with given name. 473 */ 474 Object readClassOrType(int i) { 475 int index = poolIdx[i]; 476 int len = getChar(index + 1); 477 int start = index + 3; 478 Assert.check(buf[start] == '[' || buf[start + len - 1] != ';'); 479 // by the above assertion, the following test can be 480 // simplified to (buf[start] == '[') 481 return (buf[start] == '[' || buf[start + len - 1] == ';') 482 ? (Object)sigToType(buf, start, len) 483 : (Object)syms.enterClass(names.fromUtf(internalize(buf, start, 484 len))); 485 } 486 487 /** Read signature and convert to type parameters. 488 */ 489 List<Type> readTypeParams(int i) { 490 int index = poolIdx[i]; 491 return sigToTypeParams(buf, index + 3, getChar(index + 1)); 492 } 493 494 /** Read class entry. 495 */ 496 ClassSymbol readClassSymbol(int i) { 497 Object obj = readPool(i); 498 if (obj != null && !(obj instanceof ClassSymbol)) 499 throw badClassFile("bad.const.pool.entry", 500 currentClassFile.toString(), 501 "CONSTANT_Class_info", i); 502 return (ClassSymbol)obj; 503 } 504 505 /** Read name. 506 */ 507 Name readName(int i) { 508 Object obj = readPool(i); 509 if (obj != null && !(obj instanceof Name)) 510 throw badClassFile("bad.const.pool.entry", 511 currentClassFile.toString(), 512 "CONSTANT_Utf8_info or CONSTANT_String_info", i); 513 return (Name)obj; 514 } 515 516 /** Read name and type. 517 */ 518 NameAndType readNameAndType(int i) { 519 Object obj = readPool(i); 520 if (obj != null && !(obj instanceof NameAndType)) 521 throw badClassFile("bad.const.pool.entry", 522 currentClassFile.toString(), 523 "CONSTANT_NameAndType_info", i); 524 return (NameAndType)obj; 525 } 526 527 /************************************************************************ 528 * Reading Types 529 ***********************************************************************/ 530 531 /** The unread portion of the currently read type is 532 * signature[sigp..siglimit-1]. 533 */ 534 byte[] signature; 535 int sigp; 536 int siglimit; 537 boolean sigEnterPhase = false; 538 539 /** Convert signature to type, where signature is a byte array segment. 540 */ 541 Type sigToType(byte[] sig, int offset, int len) { 542 signature = sig; 543 sigp = offset; 544 siglimit = offset + len; 545 return sigToType(); 546 } 547 548 /** Convert signature to type, where signature is implicit. 549 */ 550 Type sigToType() { 551 switch ((char) signature[sigp]) { 552 case 'T': 553 sigp++; 554 int start = sigp; 555 while (signature[sigp] != ';') sigp++; 556 sigp++; 557 return sigEnterPhase 558 ? Type.noType 559 : findTypeVar(names.fromUtf(signature, start, sigp - 1 - start)); 560 case '+': { 561 sigp++; 562 Type t = sigToType(); 563 return new WildcardType(t, BoundKind.EXTENDS, syms.boundClass); 564 } 565 case '*': 566 sigp++; 567 return new WildcardType(syms.objectType, BoundKind.UNBOUND, 568 syms.boundClass); 569 case '-': { 570 sigp++; 571 Type t = sigToType(); 572 return new WildcardType(t, BoundKind.SUPER, syms.boundClass); 573 } 574 case 'B': 575 sigp++; 576 return syms.byteType; 577 case 'C': 578 sigp++; 579 return syms.charType; 580 case 'D': 581 sigp++; 582 return syms.doubleType; 583 case 'F': 584 sigp++; 585 return syms.floatType; 586 case 'I': 587 sigp++; 588 return syms.intType; 589 case 'J': 590 sigp++; 591 return syms.longType; 592 case 'L': 593 { 594 // int oldsigp = sigp; 595 Type t = classSigToType(); 596 if (sigp < siglimit && signature[sigp] == '.') 597 throw badClassFile("deprecated inner class signature syntax " + 598 "(please recompile from source)"); 599 /* 600 System.err.println(" decoded " + 601 new String(signature, oldsigp, sigp-oldsigp) + 602 " => " + t + " outer " + t.outer()); 603 */ 604 return t; 605 } 606 case 'S': 607 sigp++; 608 return syms.shortType; 609 case 'V': 610 sigp++; 611 return syms.voidType; 612 case 'Z': 613 sigp++; 614 return syms.booleanType; 615 case '[': 616 sigp++; 617 return new ArrayType(sigToType(), syms.arrayClass); 618 case '(': 619 sigp++; 620 List<Type> argtypes = sigToTypes(')'); 621 Type restype = sigToType(); 622 List<Type> thrown = List.nil(); 623 while (signature[sigp] == '^') { 624 sigp++; 625 thrown = thrown.prepend(sigToType()); 626 } 627 // if there is a typevar in the throws clause we should state it. 628 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail) { 629 if (l.head.hasTag(TYPEVAR)) { 630 l.head.tsym.flags_field |= THROWS; 631 } 632 } 633 return new MethodType(argtypes, 634 restype, 635 thrown.reverse(), 636 syms.methodClass); 637 case '<': 638 typevars = typevars.dup(currentOwner); 639 Type poly = new ForAll(sigToTypeParams(), sigToType()); 640 typevars = typevars.leave(); 641 return poly; 642 default: 643 throw badClassFile("bad.signature", 644 Convert.utf2string(signature, sigp, 10)); 645 } 646 } 647 648 byte[] signatureBuffer = new byte[0]; 649 int sbp = 0; 650 /** Convert class signature to type, where signature is implicit. 651 */ 652 Type classSigToType() { 653 if (signature[sigp] != 'L') 654 throw badClassFile("bad.class.signature", 655 Convert.utf2string(signature, sigp, 10)); 656 sigp++; 657 Type outer = Type.noType; 658 int startSbp = sbp; 659 660 while (true) { 661 final byte c = signature[sigp++]; 662 switch (c) { 663 664 case ';': { // end 665 ClassSymbol t = syms.enterClass(names.fromUtf(signatureBuffer, 666 startSbp, 667 sbp - startSbp)); 668 669 try { 670 return (outer == Type.noType) ? 671 t.erasure(types) : 672 new ClassType(outer, List.<Type>nil(), t); 673 } finally { 674 sbp = startSbp; 675 } 676 } 677 678 case '<': // generic arguments 679 ClassSymbol t = syms.enterClass(names.fromUtf(signatureBuffer, 680 startSbp, 681 sbp - startSbp)); 682 outer = new ClassType(outer, sigToTypes('>'), t) { 683 boolean completed = false; 684 @Override @DefinedBy(Api.LANGUAGE_MODEL) 685 public Type getEnclosingType() { 686 if (!completed) { 687 completed = true; 688 tsym.complete(); 689 Type enclosingType = tsym.type.getEnclosingType(); 690 if (enclosingType != Type.noType) { 691 List<Type> typeArgs = 692 super.getEnclosingType().allparams(); 693 List<Type> typeParams = 694 enclosingType.allparams(); 695 if (typeParams.length() != typeArgs.length()) { 696 // no "rare" types 697 super.setEnclosingType(types.erasure(enclosingType)); 698 } else { 699 super.setEnclosingType(types.subst(enclosingType, 700 typeParams, 701 typeArgs)); 702 } 703 } else { 704 super.setEnclosingType(Type.noType); 705 } 706 } 707 return super.getEnclosingType(); 708 } 709 @Override 710 public void setEnclosingType(Type outer) { 711 throw new UnsupportedOperationException(); 712 } 713 }; 714 switch (signature[sigp++]) { 715 case ';': 716 if (sigp < signature.length && signature[sigp] == '.') { 717 // support old-style GJC signatures 718 // The signature produced was 719 // Lfoo/Outer<Lfoo/X;>;.Lfoo/Outer$Inner<Lfoo/Y;>; 720 // rather than say 721 // Lfoo/Outer<Lfoo/X;>.Inner<Lfoo/Y;>; 722 // so we skip past ".Lfoo/Outer$" 723 sigp += (sbp - startSbp) + // "foo/Outer" 724 3; // ".L" and "$" 725 signatureBuffer[sbp++] = (byte)'$'; 726 break; 727 } else { 728 sbp = startSbp; 729 return outer; 730 } 731 case '.': 732 signatureBuffer[sbp++] = (byte)'$'; 733 break; 734 default: 735 throw new AssertionError(signature[sigp-1]); 736 } 737 continue; 738 739 case '.': 740 //we have seen an enclosing non-generic class 741 if (outer != Type.noType) { 742 t = syms.enterClass(names.fromUtf(signatureBuffer, 743 startSbp, 744 sbp - startSbp)); 745 outer = new ClassType(outer, List.<Type>nil(), t); 746 } 747 signatureBuffer[sbp++] = (byte)'$'; 748 continue; 749 case '/': 750 signatureBuffer[sbp++] = (byte)'.'; 751 continue; 752 default: 753 signatureBuffer[sbp++] = c; 754 continue; 755 } 756 } 757 } 758 759 /** Convert (implicit) signature to list of types 760 * until `terminator' is encountered. 761 */ 762 List<Type> sigToTypes(char terminator) { 763 List<Type> head = List.of(null); 764 List<Type> tail = head; 765 while (signature[sigp] != terminator) 766 tail = tail.setTail(List.of(sigToType())); 767 sigp++; 768 return head.tail; 769 } 770 771 /** Convert signature to type parameters, where signature is a byte 772 * array segment. 773 */ 774 List<Type> sigToTypeParams(byte[] sig, int offset, int len) { 775 signature = sig; 776 sigp = offset; 777 siglimit = offset + len; 778 return sigToTypeParams(); 779 } 780 781 /** Convert signature to type parameters, where signature is implicit. 782 */ 783 List<Type> sigToTypeParams() { 784 List<Type> tvars = List.nil(); 785 if (signature[sigp] == '<') { 786 sigp++; 787 int start = sigp; 788 sigEnterPhase = true; 789 while (signature[sigp] != '>') 790 tvars = tvars.prepend(sigToTypeParam()); 791 sigEnterPhase = false; 792 sigp = start; 793 while (signature[sigp] != '>') 794 sigToTypeParam(); 795 sigp++; 796 } 797 return tvars.reverse(); 798 } 799 800 /** Convert (implicit) signature to type parameter. 801 */ 802 Type sigToTypeParam() { 803 int start = sigp; 804 while (signature[sigp] != ':') sigp++; 805 Name name = names.fromUtf(signature, start, sigp - start); 806 TypeVar tvar; 807 if (sigEnterPhase) { 808 tvar = new TypeVar(name, currentOwner, syms.botType); 809 typevars.enter(tvar.tsym); 810 } else { 811 tvar = (TypeVar)findTypeVar(name); 812 } 813 List<Type> bounds = List.nil(); 814 boolean allInterfaces = false; 815 if (signature[sigp] == ':' && signature[sigp+1] == ':') { 816 sigp++; 817 allInterfaces = true; 818 } 819 while (signature[sigp] == ':') { 820 sigp++; 821 bounds = bounds.prepend(sigToType()); 822 } 823 if (!sigEnterPhase) { 824 types.setBounds(tvar, bounds.reverse(), allInterfaces); 825 } 826 return tvar; 827 } 828 829 /** Find type variable with given name in `typevars' scope. 830 */ 831 Type findTypeVar(Name name) { 832 Symbol s = typevars.findFirst(name); 833 if (s != null) { 834 return s.type; 835 } else { 836 if (readingClassAttr) { 837 // While reading the class attribute, the supertypes 838 // might refer to a type variable from an enclosing element 839 // (method or class). 840 // If the type variable is defined in the enclosing class, 841 // we can actually find it in 842 // currentOwner.owner.type.getTypeArguments() 843 // However, until we have read the enclosing method attribute 844 // we don't know for sure if this owner is correct. It could 845 // be a method and there is no way to tell before reading the 846 // enclosing method attribute. 847 TypeVar t = new TypeVar(name, currentOwner, syms.botType); 848 missingTypeVariables = missingTypeVariables.prepend(t); 849 // System.err.println("Missing type var " + name); 850 return t; 851 } 852 throw badClassFile("undecl.type.var", name); 853 } 854 } 855 856 /************************************************************************ 857 * Reading Attributes 858 ***********************************************************************/ 859 860 protected enum AttributeKind { CLASS, MEMBER } 861 862 protected abstract class AttributeReader { 863 protected AttributeReader(Name name, ClassFile.Version version, Set<AttributeKind> kinds) { 864 this.name = name; 865 this.version = version; 866 this.kinds = kinds; 867 } 868 869 protected boolean accepts(AttributeKind kind) { 870 if (kinds.contains(kind)) { 871 if (majorVersion > version.major || (majorVersion == version.major && minorVersion >= version.minor)) 872 return true; 873 874 if (lintClassfile && !warnedAttrs.contains(name)) { 875 JavaFileObject prev = log.useSource(currentClassFile); 876 try { 877 log.warning(LintCategory.CLASSFILE, (DiagnosticPosition) null, "future.attr", 878 name, version.major, version.minor, majorVersion, minorVersion); 879 } finally { 880 log.useSource(prev); 881 } 882 warnedAttrs.add(name); 883 } 884 } 885 return false; 886 } 887 888 protected abstract void read(Symbol sym, int attrLen); 889 890 protected final Name name; 891 protected final ClassFile.Version version; 892 protected final Set<AttributeKind> kinds; 893 } 894 895 protected Set<AttributeKind> CLASS_ATTRIBUTE = 896 EnumSet.of(AttributeKind.CLASS); 897 protected Set<AttributeKind> MEMBER_ATTRIBUTE = 898 EnumSet.of(AttributeKind.MEMBER); 899 protected Set<AttributeKind> CLASS_OR_MEMBER_ATTRIBUTE = 900 EnumSet.of(AttributeKind.CLASS, AttributeKind.MEMBER); 901 902 protected Map<Name, AttributeReader> attributeReaders = new HashMap<>(); 903 904 private void initAttributeReaders() { 905 AttributeReader[] readers = { 906 // v45.3 attributes 907 908 new AttributeReader(names.Code, V45_3, MEMBER_ATTRIBUTE) { 909 protected void read(Symbol sym, int attrLen) { 910 if (readAllOfClassFile || saveParameterNames) 911 ((MethodSymbol)sym).code = readCode(sym); 912 else 913 bp = bp + attrLen; 914 } 915 }, 916 917 new AttributeReader(names.ConstantValue, V45_3, MEMBER_ATTRIBUTE) { 918 protected void read(Symbol sym, int attrLen) { 919 Object v = readPool(nextChar()); 920 // Ignore ConstantValue attribute if field not final. 921 if ((sym.flags() & FINAL) != 0) 922 ((VarSymbol) sym).setData(v); 923 } 924 }, 925 926 new AttributeReader(names.Deprecated, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) { 927 protected void read(Symbol sym, int attrLen) { 928 sym.flags_field |= DEPRECATED; 929 } 930 }, 931 932 new AttributeReader(names.Exceptions, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) { 933 protected void read(Symbol sym, int attrLen) { 934 int nexceptions = nextChar(); 935 List<Type> thrown = List.nil(); 936 for (int j = 0; j < nexceptions; j++) 937 thrown = thrown.prepend(readClassSymbol(nextChar()).type); 938 if (sym.type.getThrownTypes().isEmpty()) 939 sym.type.asMethodType().thrown = thrown.reverse(); 940 } 941 }, 942 943 new AttributeReader(names.InnerClasses, V45_3, CLASS_ATTRIBUTE) { 944 protected void read(Symbol sym, int attrLen) { 945 ClassSymbol c = (ClassSymbol) sym; 946 readInnerClasses(c); 947 } 948 }, 949 950 new AttributeReader(names.LocalVariableTable, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) { 951 protected void read(Symbol sym, int attrLen) { 952 int newbp = bp + attrLen; 953 if (saveParameterNames && !sawMethodParameters) { 954 // Pick up parameter names from the variable table. 955 // Parameter names are not explicitly identified as such, 956 // but all parameter name entries in the LocalVariableTable 957 // have a start_pc of 0. Therefore, we record the name 958 // indicies of all slots with a start_pc of zero in the 959 // parameterNameIndicies array. 960 // Note that this implicitly honors the JVMS spec that 961 // there may be more than one LocalVariableTable, and that 962 // there is no specified ordering for the entries. 963 int numEntries = nextChar(); 964 for (int i = 0; i < numEntries; i++) { 965 int start_pc = nextChar(); 966 int length = nextChar(); 967 int nameIndex = nextChar(); 968 int sigIndex = nextChar(); 969 int register = nextChar(); 970 if (start_pc == 0) { 971 // ensure array large enough 972 if (register >= parameterNameIndices.length) { 973 int newSize = Math.max(register, parameterNameIndices.length + 8); 974 parameterNameIndices = 975 Arrays.copyOf(parameterNameIndices, newSize); 976 } 977 parameterNameIndices[register] = nameIndex; 978 haveParameterNameIndices = true; 979 } 980 } 981 } 982 bp = newbp; 983 } 984 }, 985 986 new AttributeReader(names.MethodParameters, V52, MEMBER_ATTRIBUTE) { 987 protected void read(Symbol sym, int attrlen) { 988 int newbp = bp + attrlen; 989 if (saveParameterNames) { 990 sawMethodParameters = true; 991 int numEntries = nextByte(); 992 parameterNameIndices = new int[numEntries]; 993 haveParameterNameIndices = true; 994 for (int i = 0; i < numEntries; i++) { 995 int nameIndex = nextChar(); 996 int flags = nextChar(); 997 parameterNameIndices[i] = nameIndex; 998 } 999 } 1000 bp = newbp; 1001 } 1002 }, 1003 1004 1005 new AttributeReader(names.SourceFile, V45_3, CLASS_ATTRIBUTE) { 1006 protected void read(Symbol sym, int attrLen) { 1007 ClassSymbol c = (ClassSymbol) sym; 1008 Name n = readName(nextChar()); 1009 c.sourcefile = new SourceFileObject(n, c.flatname); 1010 // If the class is a toplevel class, originating from a Java source file, 1011 // but the class name does not match the file name, then it is 1012 // an auxiliary class. 1013 String sn = n.toString(); 1014 if (c.owner.kind == PCK && 1015 sn.endsWith(".java") && 1016 !sn.equals(c.name.toString()+".java")) { 1017 c.flags_field |= AUXILIARY; 1018 } 1019 } 1020 }, 1021 1022 new AttributeReader(names.Synthetic, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) { 1023 protected void read(Symbol sym, int attrLen) { 1024 sym.flags_field |= SYNTHETIC; 1025 } 1026 }, 1027 1028 // standard v49 attributes 1029 1030 new AttributeReader(names.EnclosingMethod, V49, CLASS_ATTRIBUTE) { 1031 protected void read(Symbol sym, int attrLen) { 1032 int newbp = bp + attrLen; 1033 readEnclosingMethodAttr(sym); 1034 bp = newbp; 1035 } 1036 }, 1037 1038 new AttributeReader(names.Signature, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1039 protected void read(Symbol sym, int attrLen) { 1040 if (sym.kind == TYP) { 1041 ClassSymbol c = (ClassSymbol) sym; 1042 readingClassAttr = true; 1043 try { 1044 ClassType ct1 = (ClassType)c.type; 1045 Assert.check(c == currentOwner); 1046 ct1.typarams_field = readTypeParams(nextChar()); 1047 ct1.supertype_field = sigToType(); 1048 ListBuffer<Type> is = new ListBuffer<>(); 1049 while (sigp != siglimit) is.append(sigToType()); 1050 ct1.interfaces_field = is.toList(); 1051 } finally { 1052 readingClassAttr = false; 1053 } 1054 } else { 1055 List<Type> thrown = sym.type.getThrownTypes(); 1056 sym.type = readType(nextChar()); 1057 //- System.err.println(" # " + sym.type); 1058 if (sym.kind == MTH && sym.type.getThrownTypes().isEmpty()) 1059 sym.type.asMethodType().thrown = thrown; 1060 1061 } 1062 } 1063 }, 1064 1065 // v49 annotation attributes 1066 1067 new AttributeReader(names.AnnotationDefault, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1068 protected void read(Symbol sym, int attrLen) { 1069 attachAnnotationDefault(sym); 1070 } 1071 }, 1072 1073 new AttributeReader(names.RuntimeInvisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1074 protected void read(Symbol sym, int attrLen) { 1075 attachAnnotations(sym); 1076 } 1077 }, 1078 1079 new AttributeReader(names.RuntimeInvisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1080 protected void read(Symbol sym, int attrLen) { 1081 attachParameterAnnotations(sym); 1082 } 1083 }, 1084 1085 new AttributeReader(names.RuntimeVisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1086 protected void read(Symbol sym, int attrLen) { 1087 attachAnnotations(sym); 1088 } 1089 }, 1090 1091 new AttributeReader(names.RuntimeVisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1092 protected void read(Symbol sym, int attrLen) { 1093 attachParameterAnnotations(sym); 1094 } 1095 }, 1096 1097 // additional "legacy" v49 attributes, superceded by flags 1098 1099 new AttributeReader(names.Annotation, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1100 protected void read(Symbol sym, int attrLen) { 1101 sym.flags_field |= ANNOTATION; 1102 } 1103 }, 1104 1105 new AttributeReader(names.Bridge, V49, MEMBER_ATTRIBUTE) { 1106 protected void read(Symbol sym, int attrLen) { 1107 sym.flags_field |= BRIDGE; 1108 } 1109 }, 1110 1111 new AttributeReader(names.Enum, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1112 protected void read(Symbol sym, int attrLen) { 1113 sym.flags_field |= ENUM; 1114 } 1115 }, 1116 1117 new AttributeReader(names.Varargs, V49, CLASS_OR_MEMBER_ATTRIBUTE) { 1118 protected void read(Symbol sym, int attrLen) { 1119 sym.flags_field |= VARARGS; 1120 } 1121 }, 1122 1123 new AttributeReader(names.RuntimeVisibleTypeAnnotations, V52, CLASS_OR_MEMBER_ATTRIBUTE) { 1124 protected void read(Symbol sym, int attrLen) { 1125 attachTypeAnnotations(sym); 1126 } 1127 }, 1128 1129 new AttributeReader(names.RuntimeInvisibleTypeAnnotations, V52, CLASS_OR_MEMBER_ATTRIBUTE) { 1130 protected void read(Symbol sym, int attrLen) { 1131 attachTypeAnnotations(sym); 1132 } 1133 }, 1134 1135 1136 // The following attributes for a Code attribute are not currently handled 1137 // StackMapTable 1138 // SourceDebugExtension 1139 // LineNumberTable 1140 // LocalVariableTypeTable 1141 }; 1142 1143 for (AttributeReader r: readers) 1144 attributeReaders.put(r.name, r); 1145 } 1146 1147 /** Report unrecognized attribute. 1148 */ 1149 void unrecognized(Name attrName) { 1150 if (checkClassFile) 1151 printCCF("ccf.unrecognized.attribute", attrName); 1152 } 1153 1154 1155 1156 protected void readEnclosingMethodAttr(Symbol sym) { 1157 // sym is a nested class with an "Enclosing Method" attribute 1158 // remove sym from it's current owners scope and place it in 1159 // the scope specified by the attribute 1160 sym.owner.members().remove(sym); 1161 ClassSymbol self = (ClassSymbol)sym; 1162 ClassSymbol c = readClassSymbol(nextChar()); 1163 NameAndType nt = readNameAndType(nextChar()); 1164 1165 if (c.members_field == null) 1166 throw badClassFile("bad.enclosing.class", self, c); 1167 1168 MethodSymbol m = findMethod(nt, c.members_field, self.flags()); 1169 if (nt != null && m == null) 1170 throw badClassFile("bad.enclosing.method", self); 1171 1172 self.name = simpleBinaryName(self.flatname, c.flatname) ; 1173 self.owner = m != null ? m : c; 1174 if (self.name.isEmpty()) 1175 self.fullname = names.empty; 1176 else 1177 self.fullname = ClassSymbol.formFullName(self.name, self.owner); 1178 1179 if (m != null) { 1180 ((ClassType)sym.type).setEnclosingType(m.type); 1181 } else if ((self.flags_field & STATIC) == 0) { 1182 ((ClassType)sym.type).setEnclosingType(c.type); 1183 } else { 1184 ((ClassType)sym.type).setEnclosingType(Type.noType); 1185 } 1186 enterTypevars(self); 1187 if (!missingTypeVariables.isEmpty()) { 1188 ListBuffer<Type> typeVars = new ListBuffer<>(); 1189 for (Type typevar : missingTypeVariables) { 1190 typeVars.append(findTypeVar(typevar.tsym.name)); 1191 } 1192 foundTypeVariables = typeVars.toList(); 1193 } else { 1194 foundTypeVariables = List.nil(); 1195 } 1196 } 1197 1198 // See java.lang.Class 1199 private Name simpleBinaryName(Name self, Name enclosing) { 1200 String simpleBinaryName = self.toString().substring(enclosing.toString().length()); 1201 if (simpleBinaryName.length() < 1 || simpleBinaryName.charAt(0) != '$') 1202 throw badClassFile("bad.enclosing.method", self); 1203 int index = 1; 1204 while (index < simpleBinaryName.length() && 1205 isAsciiDigit(simpleBinaryName.charAt(index))) 1206 index++; 1207 return names.fromString(simpleBinaryName.substring(index)); 1208 } 1209 1210 private MethodSymbol findMethod(NameAndType nt, Scope scope, long flags) { 1211 if (nt == null) 1212 return null; 1213 1214 MethodType type = nt.uniqueType.type.asMethodType(); 1215 1216 for (Symbol sym : scope.getSymbolsByName(nt.name)) { 1217 if (sym.kind == MTH && isSameBinaryType(sym.type.asMethodType(), type)) 1218 return (MethodSymbol)sym; 1219 } 1220 1221 if (nt.name != names.init) 1222 // not a constructor 1223 return null; 1224 if ((flags & INTERFACE) != 0) 1225 // no enclosing instance 1226 return null; 1227 if (nt.uniqueType.type.getParameterTypes().isEmpty()) 1228 // no parameters 1229 return null; 1230 1231 // A constructor of an inner class. 1232 // Remove the first argument (the enclosing instance) 1233 nt.setType(new MethodType(nt.uniqueType.type.getParameterTypes().tail, 1234 nt.uniqueType.type.getReturnType(), 1235 nt.uniqueType.type.getThrownTypes(), 1236 syms.methodClass)); 1237 // Try searching again 1238 return findMethod(nt, scope, flags); 1239 } 1240 1241 /** Similar to Types.isSameType but avoids completion */ 1242 private boolean isSameBinaryType(MethodType mt1, MethodType mt2) { 1243 List<Type> types1 = types.erasure(mt1.getParameterTypes()) 1244 .prepend(types.erasure(mt1.getReturnType())); 1245 List<Type> types2 = mt2.getParameterTypes().prepend(mt2.getReturnType()); 1246 while (!types1.isEmpty() && !types2.isEmpty()) { 1247 if (types1.head.tsym != types2.head.tsym) 1248 return false; 1249 types1 = types1.tail; 1250 types2 = types2.tail; 1251 } 1252 return types1.isEmpty() && types2.isEmpty(); 1253 } 1254 1255 /** 1256 * Character.isDigit answers <tt>true</tt> to some non-ascii 1257 * digits. This one does not. <b>copied from java.lang.Class</b> 1258 */ 1259 private static boolean isAsciiDigit(char c) { 1260 return '0' <= c && c <= '9'; 1261 } 1262 1263 /** Read member attributes. 1264 */ 1265 void readMemberAttrs(Symbol sym) { 1266 readAttrs(sym, AttributeKind.MEMBER); 1267 } 1268 1269 void readAttrs(Symbol sym, AttributeKind kind) { 1270 char ac = nextChar(); 1271 for (int i = 0; i < ac; i++) { 1272 Name attrName = readName(nextChar()); 1273 int attrLen = nextInt(); 1274 AttributeReader r = attributeReaders.get(attrName); 1275 if (r != null && r.accepts(kind)) 1276 r.read(sym, attrLen); 1277 else { 1278 unrecognized(attrName); 1279 bp = bp + attrLen; 1280 } 1281 } 1282 } 1283 1284 private boolean readingClassAttr = false; 1285 private List<Type> missingTypeVariables = List.nil(); 1286 private List<Type> foundTypeVariables = List.nil(); 1287 1288 /** Read class attributes. 1289 */ 1290 void readClassAttrs(ClassSymbol c) { 1291 readAttrs(c, AttributeKind.CLASS); 1292 } 1293 1294 /** Read code block. 1295 */ 1296 Code readCode(Symbol owner) { 1297 nextChar(); // max_stack 1298 nextChar(); // max_locals 1299 final int code_length = nextInt(); 1300 bp += code_length; 1301 final char exception_table_length = nextChar(); 1302 bp += exception_table_length * 8; 1303 readMemberAttrs(owner); 1304 return null; 1305 } 1306 1307 /************************************************************************ 1308 * Reading Java-language annotations 1309 ***********************************************************************/ 1310 1311 /** Attach annotations. 1312 */ 1313 void attachAnnotations(final Symbol sym) { 1314 int numAttributes = nextChar(); 1315 if (numAttributes != 0) { 1316 ListBuffer<CompoundAnnotationProxy> proxies = new ListBuffer<>(); 1317 for (int i = 0; i<numAttributes; i++) { 1318 CompoundAnnotationProxy proxy = readCompoundAnnotation(); 1319 1320 if (proxy.type.tsym == syms.annotationTargetType.tsym) { 1321 target = proxy; 1322 } else if (proxy.type.tsym == syms.repeatableType.tsym) { 1323 repeatable = proxy; 1324 } 1325 1326 proxies.append(proxy); 1327 } 1328 annotate.normal(new AnnotationCompleter(sym, proxies.toList())); 1329 } 1330 } 1331 1332 /** Attach parameter annotations. 1333 */ 1334 void attachParameterAnnotations(final Symbol method) { 1335 final MethodSymbol meth = (MethodSymbol)method; 1336 int numParameters = buf[bp++] & 0xFF; 1337 List<VarSymbol> parameters = meth.params(); 1338 int pnum = 0; 1339 while (parameters.tail != null) { 1340 attachAnnotations(parameters.head); 1341 parameters = parameters.tail; 1342 pnum++; 1343 } 1344 if (pnum != numParameters) { 1345 throw badClassFile("bad.runtime.invisible.param.annotations", meth); 1346 } 1347 } 1348 1349 void attachTypeAnnotations(final Symbol sym) { 1350 int numAttributes = nextChar(); 1351 if (numAttributes != 0) { 1352 ListBuffer<TypeAnnotationProxy> proxies = new ListBuffer<>(); 1353 for (int i = 0; i < numAttributes; i++) 1354 proxies.append(readTypeAnnotation()); 1355 annotate.normal(new TypeAnnotationCompleter(sym, proxies.toList())); 1356 } 1357 } 1358 1359 /** Attach the default value for an annotation element. 1360 */ 1361 void attachAnnotationDefault(final Symbol sym) { 1362 final MethodSymbol meth = (MethodSymbol)sym; // only on methods 1363 final Attribute value = readAttributeValue(); 1364 1365 // The default value is set later during annotation. It might 1366 // be the case that the Symbol sym is annotated _after_ the 1367 // repeating instances that depend on this default value, 1368 // because of this we set an interim value that tells us this 1369 // element (most likely) has a default. 1370 // 1371 // Set interim value for now, reset just before we do this 1372 // properly at annotate time. 1373 meth.defaultValue = value; 1374 annotate.normal(new AnnotationDefaultCompleter(meth, value)); 1375 } 1376 1377 Type readTypeOrClassSymbol(int i) { 1378 // support preliminary jsr175-format class files 1379 if (buf[poolIdx[i]] == CONSTANT_Class) 1380 return readClassSymbol(i).type; 1381 return readType(i); 1382 } 1383 Type readEnumType(int i) { 1384 // support preliminary jsr175-format class files 1385 int index = poolIdx[i]; 1386 int length = getChar(index + 1); 1387 if (buf[index + length + 2] != ';') 1388 return syms.enterClass(readName(i)).type; 1389 return readType(i); 1390 } 1391 1392 CompoundAnnotationProxy readCompoundAnnotation() { 1393 Type t = readTypeOrClassSymbol(nextChar()); 1394 int numFields = nextChar(); 1395 ListBuffer<Pair<Name,Attribute>> pairs = new ListBuffer<>(); 1396 for (int i=0; i<numFields; i++) { 1397 Name name = readName(nextChar()); 1398 Attribute value = readAttributeValue(); 1399 pairs.append(new Pair<>(name, value)); 1400 } 1401 return new CompoundAnnotationProxy(t, pairs.toList()); 1402 } 1403 1404 TypeAnnotationProxy readTypeAnnotation() { 1405 TypeAnnotationPosition position = readPosition(); 1406 CompoundAnnotationProxy proxy = readCompoundAnnotation(); 1407 1408 return new TypeAnnotationProxy(proxy, position); 1409 } 1410 1411 TypeAnnotationPosition readPosition() { 1412 int tag = nextByte(); // TargetType tag is a byte 1413 1414 if (!TargetType.isValidTargetTypeValue(tag)) 1415 throw badClassFile("bad.type.annotation.value", String.format("0x%02X", tag)); 1416 1417 TargetType type = TargetType.fromTargetTypeValue(tag); 1418 1419 switch (type) { 1420 // instanceof 1421 case INSTANCEOF: { 1422 final int offset = nextChar(); 1423 final TypeAnnotationPosition position = 1424 TypeAnnotationPosition.instanceOf(readTypePath()); 1425 position.offset = offset; 1426 return position; 1427 } 1428 // new expression 1429 case NEW: { 1430 final int offset = nextChar(); 1431 final TypeAnnotationPosition position = 1432 TypeAnnotationPosition.newObj(readTypePath()); 1433 position.offset = offset; 1434 return position; 1435 } 1436 // constructor/method reference receiver 1437 case CONSTRUCTOR_REFERENCE: { 1438 final int offset = nextChar(); 1439 final TypeAnnotationPosition position = 1440 TypeAnnotationPosition.constructorRef(readTypePath()); 1441 position.offset = offset; 1442 return position; 1443 } 1444 case METHOD_REFERENCE: { 1445 final int offset = nextChar(); 1446 final TypeAnnotationPosition position = 1447 TypeAnnotationPosition.methodRef(readTypePath()); 1448 position.offset = offset; 1449 return position; 1450 } 1451 // local variable 1452 case LOCAL_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.localVariable(readTypePath()); 1466 position.lvarOffset = newLvarOffset; 1467 position.lvarLength = newLvarLength; 1468 position.lvarIndex = newLvarIndex; 1469 return position; 1470 } 1471 // resource variable 1472 case RESOURCE_VARIABLE: { 1473 final int table_length = nextChar(); 1474 final int[] newLvarOffset = new int[table_length]; 1475 final int[] newLvarLength = new int[table_length]; 1476 final int[] newLvarIndex = new int[table_length]; 1477 1478 for (int i = 0; i < table_length; ++i) { 1479 newLvarOffset[i] = nextChar(); 1480 newLvarLength[i] = nextChar(); 1481 newLvarIndex[i] = nextChar(); 1482 } 1483 1484 final TypeAnnotationPosition position = 1485 TypeAnnotationPosition.resourceVariable(readTypePath()); 1486 position.lvarOffset = newLvarOffset; 1487 position.lvarLength = newLvarLength; 1488 position.lvarIndex = newLvarIndex; 1489 return position; 1490 } 1491 // exception parameter 1492 case EXCEPTION_PARAMETER: { 1493 final int exception_index = nextChar(); 1494 final TypeAnnotationPosition position = 1495 TypeAnnotationPosition.exceptionParameter(readTypePath()); 1496 position.setExceptionIndex(exception_index); 1497 return position; 1498 } 1499 // method receiver 1500 case METHOD_RECEIVER: 1501 return TypeAnnotationPosition.methodReceiver(readTypePath()); 1502 // type parameter 1503 case CLASS_TYPE_PARAMETER: { 1504 final int parameter_index = nextByte(); 1505 return TypeAnnotationPosition 1506 .typeParameter(readTypePath(), parameter_index); 1507 } 1508 case METHOD_TYPE_PARAMETER: { 1509 final int parameter_index = nextByte(); 1510 return TypeAnnotationPosition 1511 .methodTypeParameter(readTypePath(), parameter_index); 1512 } 1513 // type parameter bound 1514 case CLASS_TYPE_PARAMETER_BOUND: { 1515 final int parameter_index = nextByte(); 1516 final int bound_index = nextByte(); 1517 return TypeAnnotationPosition 1518 .typeParameterBound(readTypePath(), parameter_index, 1519 bound_index); 1520 } 1521 case METHOD_TYPE_PARAMETER_BOUND: { 1522 final int parameter_index = nextByte(); 1523 final int bound_index = nextByte(); 1524 return TypeAnnotationPosition 1525 .methodTypeParameterBound(readTypePath(), parameter_index, 1526 bound_index); 1527 } 1528 // class extends or implements clause 1529 case CLASS_EXTENDS: { 1530 final int type_index = nextChar(); 1531 return TypeAnnotationPosition.classExtends(readTypePath(), 1532 type_index); 1533 } 1534 // throws 1535 case THROWS: { 1536 final int type_index = nextChar(); 1537 return TypeAnnotationPosition.methodThrows(readTypePath(), 1538 type_index); 1539 } 1540 // method parameter 1541 case METHOD_FORMAL_PARAMETER: { 1542 final int parameter_index = nextByte(); 1543 return TypeAnnotationPosition.methodParameter(readTypePath(), 1544 parameter_index); 1545 } 1546 // type cast 1547 case CAST: { 1548 final int offset = nextChar(); 1549 final int type_index = nextByte(); 1550 final TypeAnnotationPosition position = 1551 TypeAnnotationPosition.typeCast(readTypePath(), type_index); 1552 position.offset = offset; 1553 return position; 1554 } 1555 // method/constructor/reference type argument 1556 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT: { 1557 final int offset = nextChar(); 1558 final int type_index = nextByte(); 1559 final TypeAnnotationPosition position = TypeAnnotationPosition 1560 .constructorInvocationTypeArg(readTypePath(), type_index); 1561 position.offset = offset; 1562 return position; 1563 } 1564 case METHOD_INVOCATION_TYPE_ARGUMENT: { 1565 final int offset = nextChar(); 1566 final int type_index = nextByte(); 1567 final TypeAnnotationPosition position = TypeAnnotationPosition 1568 .methodInvocationTypeArg(readTypePath(), type_index); 1569 position.offset = offset; 1570 return position; 1571 } 1572 case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT: { 1573 final int offset = nextChar(); 1574 final int type_index = nextByte(); 1575 final TypeAnnotationPosition position = TypeAnnotationPosition 1576 .constructorRefTypeArg(readTypePath(), type_index); 1577 position.offset = offset; 1578 return position; 1579 } 1580 case METHOD_REFERENCE_TYPE_ARGUMENT: { 1581 final int offset = nextChar(); 1582 final int type_index = nextByte(); 1583 final TypeAnnotationPosition position = TypeAnnotationPosition 1584 .methodRefTypeArg(readTypePath(), type_index); 1585 position.offset = offset; 1586 return position; 1587 } 1588 // We don't need to worry about these 1589 case METHOD_RETURN: 1590 return TypeAnnotationPosition.methodReturn(readTypePath()); 1591 case FIELD: 1592 return TypeAnnotationPosition.field(readTypePath()); 1593 case UNKNOWN: 1594 throw new AssertionError("jvm.ClassReader: UNKNOWN target type should never occur!"); 1595 default: 1596 throw new AssertionError("jvm.ClassReader: Unknown target type for position: " + type); 1597 } 1598 } 1599 1600 List<TypeAnnotationPosition.TypePathEntry> readTypePath() { 1601 int len = nextByte(); 1602 ListBuffer<Integer> loc = new ListBuffer<>(); 1603 for (int i = 0; i < len * TypeAnnotationPosition.TypePathEntry.bytesPerEntry; ++i) 1604 loc = loc.append(nextByte()); 1605 1606 return TypeAnnotationPosition.getTypePathFromBinary(loc.toList()); 1607 1608 } 1609 1610 Attribute readAttributeValue() { 1611 char c = (char) buf[bp++]; 1612 switch (c) { 1613 case 'B': 1614 return new Attribute.Constant(syms.byteType, readPool(nextChar())); 1615 case 'C': 1616 return new Attribute.Constant(syms.charType, readPool(nextChar())); 1617 case 'D': 1618 return new Attribute.Constant(syms.doubleType, readPool(nextChar())); 1619 case 'F': 1620 return new Attribute.Constant(syms.floatType, readPool(nextChar())); 1621 case 'I': 1622 return new Attribute.Constant(syms.intType, readPool(nextChar())); 1623 case 'J': 1624 return new Attribute.Constant(syms.longType, readPool(nextChar())); 1625 case 'S': 1626 return new Attribute.Constant(syms.shortType, readPool(nextChar())); 1627 case 'Z': 1628 return new Attribute.Constant(syms.booleanType, readPool(nextChar())); 1629 case 's': 1630 return new Attribute.Constant(syms.stringType, readPool(nextChar()).toString()); 1631 case 'e': 1632 return new EnumAttributeProxy(readEnumType(nextChar()), readName(nextChar())); 1633 case 'c': 1634 return new Attribute.Class(types, readTypeOrClassSymbol(nextChar())); 1635 case '[': { 1636 int n = nextChar(); 1637 ListBuffer<Attribute> l = new ListBuffer<>(); 1638 for (int i=0; i<n; i++) 1639 l.append(readAttributeValue()); 1640 return new ArrayAttributeProxy(l.toList()); 1641 } 1642 case '@': 1643 return readCompoundAnnotation(); 1644 default: 1645 throw new AssertionError("unknown annotation tag '" + c + "'"); 1646 } 1647 } 1648 1649 interface ProxyVisitor extends Attribute.Visitor { 1650 void visitEnumAttributeProxy(EnumAttributeProxy proxy); 1651 void visitArrayAttributeProxy(ArrayAttributeProxy proxy); 1652 void visitCompoundAnnotationProxy(CompoundAnnotationProxy proxy); 1653 } 1654 1655 static class EnumAttributeProxy extends Attribute { 1656 Type enumType; 1657 Name enumerator; 1658 public EnumAttributeProxy(Type enumType, Name enumerator) { 1659 super(null); 1660 this.enumType = enumType; 1661 this.enumerator = enumerator; 1662 } 1663 public void accept(Visitor v) { ((ProxyVisitor)v).visitEnumAttributeProxy(this); } 1664 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1665 public String toString() { 1666 return "/*proxy enum*/" + enumType + "." + enumerator; 1667 } 1668 } 1669 1670 static class ArrayAttributeProxy extends Attribute { 1671 List<Attribute> values; 1672 ArrayAttributeProxy(List<Attribute> values) { 1673 super(null); 1674 this.values = values; 1675 } 1676 public void accept(Visitor v) { ((ProxyVisitor)v).visitArrayAttributeProxy(this); } 1677 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1678 public String toString() { 1679 return "{" + values + "}"; 1680 } 1681 } 1682 1683 /** A temporary proxy representing a compound attribute. 1684 */ 1685 static class CompoundAnnotationProxy extends Attribute { 1686 final List<Pair<Name,Attribute>> values; 1687 public CompoundAnnotationProxy(Type type, 1688 List<Pair<Name,Attribute>> values) { 1689 super(type); 1690 this.values = values; 1691 } 1692 public void accept(Visitor v) { ((ProxyVisitor)v).visitCompoundAnnotationProxy(this); } 1693 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1694 public String toString() { 1695 StringBuilder buf = new StringBuilder(); 1696 buf.append("@"); 1697 buf.append(type.tsym.getQualifiedName()); 1698 buf.append("/*proxy*/{"); 1699 boolean first = true; 1700 for (List<Pair<Name,Attribute>> v = values; 1701 v.nonEmpty(); v = v.tail) { 1702 Pair<Name,Attribute> value = v.head; 1703 if (!first) buf.append(","); 1704 first = false; 1705 buf.append(value.fst); 1706 buf.append("="); 1707 buf.append(value.snd); 1708 } 1709 buf.append("}"); 1710 return buf.toString(); 1711 } 1712 } 1713 1714 /** A temporary proxy representing a type annotation. 1715 */ 1716 static class TypeAnnotationProxy { 1717 final CompoundAnnotationProxy compound; 1718 final TypeAnnotationPosition position; 1719 public TypeAnnotationProxy(CompoundAnnotationProxy compound, 1720 TypeAnnotationPosition position) { 1721 this.compound = compound; 1722 this.position = position; 1723 } 1724 } 1725 1726 class AnnotationDeproxy implements ProxyVisitor { 1727 private ClassSymbol requestingOwner; 1728 1729 AnnotationDeproxy(ClassSymbol owner) { 1730 this.requestingOwner = owner; 1731 } 1732 1733 List<Attribute.Compound> deproxyCompoundList(List<CompoundAnnotationProxy> pl) { 1734 // also must fill in types!!!! 1735 ListBuffer<Attribute.Compound> buf = new ListBuffer<>(); 1736 for (List<CompoundAnnotationProxy> l = pl; l.nonEmpty(); l=l.tail) { 1737 buf.append(deproxyCompound(l.head)); 1738 } 1739 return buf.toList(); 1740 } 1741 1742 Attribute.Compound deproxyCompound(CompoundAnnotationProxy a) { 1743 ListBuffer<Pair<Symbol.MethodSymbol,Attribute>> buf = new ListBuffer<>(); 1744 for (List<Pair<Name,Attribute>> l = a.values; 1745 l.nonEmpty(); 1746 l = l.tail) { 1747 MethodSymbol meth = findAccessMethod(a.type, l.head.fst); 1748 buf.append(new Pair<>(meth, deproxy(meth.type.getReturnType(), l.head.snd))); 1749 } 1750 return new Attribute.Compound(a.type, buf.toList()); 1751 } 1752 1753 MethodSymbol findAccessMethod(Type container, Name name) { 1754 CompletionFailure failure = null; 1755 try { 1756 for (Symbol sym : container.tsym.members().getSymbolsByName(name)) { 1757 if (sym.kind == MTH && sym.type.getParameterTypes().length() == 0) 1758 return (MethodSymbol) sym; 1759 } 1760 } catch (CompletionFailure ex) { 1761 failure = ex; 1762 } 1763 // The method wasn't found: emit a warning and recover 1764 JavaFileObject prevSource = log.useSource(requestingOwner.classfile); 1765 try { 1766 if (lintClassfile) { 1767 if (failure == null) { 1768 log.warning("annotation.method.not.found", 1769 container, 1770 name); 1771 } else { 1772 log.warning("annotation.method.not.found.reason", 1773 container, 1774 name, 1775 failure.getDetailValue());//diagnostic, if present 1776 } 1777 } 1778 } finally { 1779 log.useSource(prevSource); 1780 } 1781 // Construct a new method type and symbol. Use bottom 1782 // type (typeof null) as return type because this type is 1783 // a subtype of all reference types and can be converted 1784 // to primitive types by unboxing. 1785 MethodType mt = new MethodType(List.<Type>nil(), 1786 syms.botType, 1787 List.<Type>nil(), 1788 syms.methodClass); 1789 return new MethodSymbol(PUBLIC | ABSTRACT, name, mt, container.tsym); 1790 } 1791 1792 Attribute result; 1793 Type type; 1794 Attribute deproxy(Type t, Attribute a) { 1795 Type oldType = type; 1796 try { 1797 type = t; 1798 a.accept(this); 1799 return result; 1800 } finally { 1801 type = oldType; 1802 } 1803 } 1804 1805 // implement Attribute.Visitor below 1806 1807 public void visitConstant(Attribute.Constant value) { 1808 // assert value.type == type; 1809 result = value; 1810 } 1811 1812 public void visitClass(Attribute.Class clazz) { 1813 result = clazz; 1814 } 1815 1816 public void visitEnum(Attribute.Enum e) { 1817 throw new AssertionError(); // shouldn't happen 1818 } 1819 1820 public void visitCompound(Attribute.Compound compound) { 1821 throw new AssertionError(); // shouldn't happen 1822 } 1823 1824 public void visitArray(Attribute.Array array) { 1825 throw new AssertionError(); // shouldn't happen 1826 } 1827 1828 public void visitError(Attribute.Error e) { 1829 throw new AssertionError(); // shouldn't happen 1830 } 1831 1832 public void visitEnumAttributeProxy(EnumAttributeProxy proxy) { 1833 // type.tsym.flatName() should == proxy.enumFlatName 1834 TypeSymbol enumTypeSym = proxy.enumType.tsym; 1835 VarSymbol enumerator = null; 1836 CompletionFailure failure = null; 1837 try { 1838 for (Symbol sym : enumTypeSym.members().getSymbolsByName(proxy.enumerator)) { 1839 if (sym.kind == VAR) { 1840 enumerator = (VarSymbol)sym; 1841 break; 1842 } 1843 } 1844 } 1845 catch (CompletionFailure ex) { 1846 failure = ex; 1847 } 1848 if (enumerator == null) { 1849 if (failure != null) { 1850 log.warning("unknown.enum.constant.reason", 1851 currentClassFile, enumTypeSym, proxy.enumerator, 1852 failure.getDiagnostic()); 1853 } else { 1854 log.warning("unknown.enum.constant", 1855 currentClassFile, enumTypeSym, proxy.enumerator); 1856 } 1857 result = new Attribute.Enum(enumTypeSym.type, 1858 new VarSymbol(0, proxy.enumerator, syms.botType, enumTypeSym)); 1859 } else { 1860 result = new Attribute.Enum(enumTypeSym.type, enumerator); 1861 } 1862 } 1863 1864 public void visitArrayAttributeProxy(ArrayAttributeProxy proxy) { 1865 int length = proxy.values.length(); 1866 Attribute[] ats = new Attribute[length]; 1867 Type elemtype = types.elemtype(type); 1868 int i = 0; 1869 for (List<Attribute> p = proxy.values; p.nonEmpty(); p = p.tail) { 1870 ats[i++] = deproxy(elemtype, p.head); 1871 } 1872 result = new Attribute.Array(type, ats); 1873 } 1874 1875 public void visitCompoundAnnotationProxy(CompoundAnnotationProxy proxy) { 1876 result = deproxyCompound(proxy); 1877 } 1878 } 1879 1880 class AnnotationDefaultCompleter extends AnnotationDeproxy implements Runnable { 1881 final MethodSymbol sym; 1882 final Attribute value; 1883 final JavaFileObject classFile = currentClassFile; 1884 1885 AnnotationDefaultCompleter(MethodSymbol sym, Attribute value) { 1886 super(currentOwner.kind == MTH 1887 ? currentOwner.enclClass() : (ClassSymbol)currentOwner); 1888 this.sym = sym; 1889 this.value = value; 1890 } 1891 1892 @Override 1893 public void run() { 1894 JavaFileObject previousClassFile = currentClassFile; 1895 try { 1896 // Reset the interim value set earlier in 1897 // attachAnnotationDefault(). 1898 sym.defaultValue = null; 1899 currentClassFile = classFile; 1900 sym.defaultValue = deproxy(sym.type.getReturnType(), value); 1901 } finally { 1902 currentClassFile = previousClassFile; 1903 } 1904 } 1905 1906 @Override 1907 public String toString() { 1908 return " ClassReader store default for " + sym.owner + "." + sym + " is " + value; 1909 } 1910 } 1911 1912 class AnnotationCompleter extends AnnotationDeproxy implements Runnable { 1913 final Symbol sym; 1914 final List<CompoundAnnotationProxy> l; 1915 final JavaFileObject classFile; 1916 1917 AnnotationCompleter(Symbol sym, List<CompoundAnnotationProxy> l) { 1918 super(currentOwner.kind == MTH 1919 ? currentOwner.enclClass() : (ClassSymbol)currentOwner); 1920 this.sym = sym; 1921 this.l = l; 1922 this.classFile = currentClassFile; 1923 } 1924 1925 @Override 1926 public void run() { 1927 JavaFileObject previousClassFile = currentClassFile; 1928 try { 1929 currentClassFile = classFile; 1930 List<Attribute.Compound> newList = deproxyCompoundList(l); 1931 if (sym.annotationsPendingCompletion()) { 1932 sym.setDeclarationAttributes(newList); 1933 } else { 1934 sym.appendAttributes(newList); 1935 } 1936 } finally { 1937 currentClassFile = previousClassFile; 1938 } 1939 } 1940 1941 @Override 1942 public String toString() { 1943 return " ClassReader annotate " + sym.owner + "." + sym + " with " + l; 1944 } 1945 } 1946 1947 class TypeAnnotationCompleter extends AnnotationCompleter { 1948 1949 List<TypeAnnotationProxy> proxies; 1950 1951 TypeAnnotationCompleter(Symbol sym, 1952 List<TypeAnnotationProxy> proxies) { 1953 super(sym, List.<CompoundAnnotationProxy>nil()); 1954 this.proxies = proxies; 1955 } 1956 1957 List<Attribute.TypeCompound> deproxyTypeCompoundList(List<TypeAnnotationProxy> proxies) { 1958 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>(); 1959 for (TypeAnnotationProxy proxy: proxies) { 1960 Attribute.Compound compound = deproxyCompound(proxy.compound); 1961 Attribute.TypeCompound typeCompound = new Attribute.TypeCompound(compound, proxy.position); 1962 buf.add(typeCompound); 1963 } 1964 return buf.toList(); 1965 } 1966 1967 @Override 1968 public void run() { 1969 JavaFileObject previousClassFile = currentClassFile; 1970 try { 1971 currentClassFile = classFile; 1972 List<Attribute.TypeCompound> newList = deproxyTypeCompoundList(proxies); 1973 sym.setTypeAttributes(newList.prependList(sym.getRawTypeAttributes())); 1974 } finally { 1975 currentClassFile = previousClassFile; 1976 } 1977 } 1978 } 1979 1980 1981 /************************************************************************ 1982 * Reading Symbols 1983 ***********************************************************************/ 1984 1985 /** Read a field. 1986 */ 1987 VarSymbol readField() { 1988 long flags = adjustFieldFlags(nextChar()); 1989 Name name = readName(nextChar()); 1990 Type type = readType(nextChar()); 1991 VarSymbol v = new VarSymbol(flags, name, type, currentOwner); 1992 readMemberAttrs(v); 1993 return v; 1994 } 1995 1996 /** Read a method. 1997 */ 1998 MethodSymbol readMethod() { 1999 long flags = adjustMethodFlags(nextChar()); 2000 Name name = readName(nextChar()); 2001 Type type = readType(nextChar()); 2002 if (currentOwner.isInterface() && 2003 (flags & ABSTRACT) == 0 && !name.equals(names.clinit)) { 2004 if (majorVersion > Version.V52.major || 2005 (majorVersion == Version.V52.major && minorVersion >= Version.V52.minor)) { 2006 if ((flags & STATIC) == 0) { 2007 currentOwner.flags_field |= DEFAULT; 2008 flags |= DEFAULT | ABSTRACT; 2009 } 2010 } else { 2011 //protect against ill-formed classfiles 2012 throw badClassFile((flags & STATIC) == 0 ? "invalid.default.interface" : "invalid.static.interface", 2013 Integer.toString(majorVersion), 2014 Integer.toString(minorVersion)); 2015 } 2016 } 2017 if (name == names.init && currentOwner.hasOuterInstance()) { 2018 // Sometimes anonymous classes don't have an outer 2019 // instance, however, there is no reliable way to tell so 2020 // we never strip this$n 2021 if (!currentOwner.name.isEmpty()) 2022 type = new MethodType(adjustMethodParams(flags, type.getParameterTypes()), 2023 type.getReturnType(), 2024 type.getThrownTypes(), 2025 syms.methodClass); 2026 } 2027 MethodSymbol m = new MethodSymbol(flags, name, type, currentOwner); 2028 if (types.isSignaturePolymorphic(m)) { 2029 m.flags_field |= SIGNATURE_POLYMORPHIC; 2030 } 2031 if (saveParameterNames) 2032 initParameterNames(m); 2033 Symbol prevOwner = currentOwner; 2034 currentOwner = m; 2035 try { 2036 readMemberAttrs(m); 2037 } finally { 2038 currentOwner = prevOwner; 2039 } 2040 if (saveParameterNames) 2041 setParameterNames(m, type); 2042 2043 if ((flags & VARARGS) != 0) { 2044 final Type last = type.getParameterTypes().last(); 2045 if (last == null || !last.hasTag(ARRAY)) { 2046 m.flags_field &= ~VARARGS; 2047 throw badClassFile("malformed.vararg.method", m); 2048 } 2049 } 2050 2051 return m; 2052 } 2053 2054 private List<Type> adjustMethodParams(long flags, List<Type> args) { 2055 boolean isVarargs = (flags & VARARGS) != 0; 2056 if (isVarargs) { 2057 Type varargsElem = args.last(); 2058 ListBuffer<Type> adjustedArgs = new ListBuffer<>(); 2059 for (Type t : args) { 2060 adjustedArgs.append(t != varargsElem ? 2061 t : 2062 ((ArrayType)t).makeVarargs()); 2063 } 2064 args = adjustedArgs.toList(); 2065 } 2066 return args.tail; 2067 } 2068 2069 /** 2070 * Init the parameter names array. 2071 * Parameter names are currently inferred from the names in the 2072 * LocalVariableTable attributes of a Code attribute. 2073 * (Note: this means parameter names are currently not available for 2074 * methods without a Code attribute.) 2075 * This method initializes an array in which to store the name indexes 2076 * of parameter names found in LocalVariableTable attributes. It is 2077 * slightly supersized to allow for additional slots with a start_pc of 0. 2078 */ 2079 void initParameterNames(MethodSymbol sym) { 2080 // make allowance for synthetic parameters. 2081 final int excessSlots = 4; 2082 int expectedParameterSlots = 2083 Code.width(sym.type.getParameterTypes()) + excessSlots; 2084 if (parameterNameIndices == null 2085 || parameterNameIndices.length < expectedParameterSlots) { 2086 parameterNameIndices = new int[expectedParameterSlots]; 2087 } else 2088 Arrays.fill(parameterNameIndices, 0); 2089 haveParameterNameIndices = false; 2090 sawMethodParameters = false; 2091 } 2092 2093 /** 2094 * Set the parameter names for a symbol from the name index in the 2095 * parameterNameIndicies array. The type of the symbol may have changed 2096 * while reading the method attributes (see the Signature attribute). 2097 * This may be because of generic information or because anonymous 2098 * synthetic parameters were added. The original type (as read from 2099 * the method descriptor) is used to help guess the existence of 2100 * anonymous synthetic parameters. 2101 * On completion, sym.savedParameter names will either be null (if 2102 * no parameter names were found in the class file) or will be set to a 2103 * list of names, one per entry in sym.type.getParameterTypes, with 2104 * any missing names represented by the empty name. 2105 */ 2106 void setParameterNames(MethodSymbol sym, Type jvmType) { 2107 // if no names were found in the class file, there's nothing more to do 2108 if (!haveParameterNameIndices) 2109 return; 2110 // If we get parameter names from MethodParameters, then we 2111 // don't need to skip. 2112 int firstParam = 0; 2113 if (!sawMethodParameters) { 2114 firstParam = ((sym.flags() & STATIC) == 0) ? 1 : 0; 2115 // the code in readMethod may have skipped the first 2116 // parameter when setting up the MethodType. If so, we 2117 // make a corresponding allowance here for the position of 2118 // the first parameter. Note that this assumes the 2119 // skipped parameter has a width of 1 -- i.e. it is not 2120 // a double width type (long or double.) 2121 if (sym.name == names.init && currentOwner.hasOuterInstance()) { 2122 // Sometimes anonymous classes don't have an outer 2123 // instance, however, there is no reliable way to tell so 2124 // we never strip this$n 2125 if (!currentOwner.name.isEmpty()) 2126 firstParam += 1; 2127 } 2128 2129 if (sym.type != jvmType) { 2130 // reading the method attributes has caused the 2131 // symbol's type to be changed. (i.e. the Signature 2132 // attribute.) This may happen if there are hidden 2133 // (synthetic) parameters in the descriptor, but not 2134 // in the Signature. The position of these hidden 2135 // parameters is unspecified; for now, assume they are 2136 // at the beginning, and so skip over them. The 2137 // primary case for this is two hidden parameters 2138 // passed into Enum constructors. 2139 int skip = Code.width(jvmType.getParameterTypes()) 2140 - Code.width(sym.type.getParameterTypes()); 2141 firstParam += skip; 2142 } 2143 } 2144 List<Name> paramNames = List.nil(); 2145 int index = firstParam; 2146 for (Type t: sym.type.getParameterTypes()) { 2147 int nameIdx = (index < parameterNameIndices.length 2148 ? parameterNameIndices[index] : 0); 2149 Name name = nameIdx == 0 ? names.empty : readName(nameIdx); 2150 paramNames = paramNames.prepend(name); 2151 index += Code.width(t); 2152 } 2153 sym.savedParameterNames = paramNames.reverse(); 2154 } 2155 2156 /** 2157 * skip n bytes 2158 */ 2159 void skipBytes(int n) { 2160 bp = bp + n; 2161 } 2162 2163 /** Skip a field or method 2164 */ 2165 void skipMember() { 2166 bp = bp + 6; 2167 char ac = nextChar(); 2168 for (int i = 0; i < ac; i++) { 2169 bp = bp + 2; 2170 int attrLen = nextInt(); 2171 bp = bp + attrLen; 2172 } 2173 } 2174 2175 /** Enter type variables of this classtype and all enclosing ones in 2176 * `typevars'. 2177 */ 2178 protected void enterTypevars(Type t) { 2179 if (t.getEnclosingType() != null && t.getEnclosingType().hasTag(CLASS)) 2180 enterTypevars(t.getEnclosingType()); 2181 for (List<Type> xs = t.getTypeArguments(); xs.nonEmpty(); xs = xs.tail) 2182 typevars.enter(xs.head.tsym); 2183 } 2184 2185 protected void enterTypevars(Symbol sym) { 2186 if (sym.owner.kind == MTH) { 2187 enterTypevars(sym.owner); 2188 enterTypevars(sym.owner.owner); 2189 } 2190 enterTypevars(sym.type); 2191 } 2192 2193 /** Read contents of a given class symbol `c'. Both external and internal 2194 * versions of an inner class are read. 2195 */ 2196 void readClass(ClassSymbol c) { 2197 ClassType ct = (ClassType)c.type; 2198 2199 // allocate scope for members 2200 c.members_field = WriteableScope.create(c); 2201 2202 // prepare type variable table 2203 typevars = typevars.dup(currentOwner); 2204 if (ct.getEnclosingType().hasTag(CLASS)) 2205 enterTypevars(ct.getEnclosingType()); 2206 2207 // read flags, or skip if this is an inner class 2208 long flags = adjustClassFlags(nextChar()); 2209 if (c.owner.kind == PCK) c.flags_field = flags; 2210 2211 // read own class name and check that it matches 2212 ClassSymbol self = readClassSymbol(nextChar()); 2213 if (c != self) 2214 throw badClassFile("class.file.wrong.class", 2215 self.flatname); 2216 2217 // class attributes must be read before class 2218 // skip ahead to read class attributes 2219 int startbp = bp; 2220 nextChar(); 2221 char interfaceCount = nextChar(); 2222 bp += interfaceCount * 2; 2223 char fieldCount = nextChar(); 2224 for (int i = 0; i < fieldCount; i++) skipMember(); 2225 char methodCount = nextChar(); 2226 for (int i = 0; i < methodCount; i++) skipMember(); 2227 readClassAttrs(c); 2228 2229 if (readAllOfClassFile) { 2230 for (int i = 1; i < poolObj.length; i++) readPool(i); 2231 c.pool = new Pool(poolObj.length, poolObj, types); 2232 } 2233 2234 // reset and read rest of classinfo 2235 bp = startbp; 2236 int n = nextChar(); 2237 if (ct.supertype_field == null) 2238 ct.supertype_field = (n == 0) 2239 ? Type.noType 2240 : readClassSymbol(n).erasure(types); 2241 n = nextChar(); 2242 List<Type> is = List.nil(); 2243 for (int i = 0; i < n; i++) { 2244 Type _inter = readClassSymbol(nextChar()).erasure(types); 2245 is = is.prepend(_inter); 2246 } 2247 if (ct.interfaces_field == null) 2248 ct.interfaces_field = is.reverse(); 2249 2250 Assert.check(fieldCount == nextChar()); 2251 for (int i = 0; i < fieldCount; i++) enterMember(c, readField()); 2252 Assert.check(methodCount == nextChar()); 2253 for (int i = 0; i < methodCount; i++) enterMember(c, readMethod()); 2254 2255 typevars = typevars.leave(); 2256 } 2257 2258 /** Read inner class info. For each inner/outer pair allocate a 2259 * member class. 2260 */ 2261 void readInnerClasses(ClassSymbol c) { 2262 int n = nextChar(); 2263 for (int i = 0; i < n; i++) { 2264 nextChar(); // skip inner class symbol 2265 ClassSymbol outer = readClassSymbol(nextChar()); 2266 Name name = readName(nextChar()); 2267 if (name == null) name = names.empty; 2268 long flags = adjustClassFlags(nextChar()); 2269 if (outer != null) { // we have a member class 2270 if (name == names.empty) 2271 name = names.one; 2272 ClassSymbol member = syms.enterClass(name, outer); 2273 if ((flags & STATIC) == 0) { 2274 ((ClassType)member.type).setEnclosingType(outer.type); 2275 if (member.erasure_field != null) 2276 ((ClassType)member.erasure_field).setEnclosingType(types.erasure(outer.type)); 2277 } 2278 if (c == outer) { 2279 member.flags_field = flags; 2280 enterMember(c, member); 2281 } 2282 } 2283 } 2284 } 2285 2286 /** Read a class definition from the bytes in buf. 2287 */ 2288 private void readClassBuffer(ClassSymbol c) throws IOException { 2289 int magic = nextInt(); 2290 if (magic != JAVA_MAGIC) 2291 throw badClassFile("illegal.start.of.class.file"); 2292 2293 minorVersion = nextChar(); 2294 majorVersion = nextChar(); 2295 int maxMajor = Version.MAX().major; 2296 int maxMinor = Version.MAX().minor; 2297 if (majorVersion > maxMajor || 2298 majorVersion * 1000 + minorVersion < 2299 Version.MIN().major * 1000 + Version.MIN().minor) 2300 { 2301 if (majorVersion == (maxMajor + 1)) 2302 log.warning("big.major.version", 2303 currentClassFile, 2304 majorVersion, 2305 maxMajor); 2306 else 2307 throw badClassFile("wrong.version", 2308 Integer.toString(majorVersion), 2309 Integer.toString(minorVersion), 2310 Integer.toString(maxMajor), 2311 Integer.toString(maxMinor)); 2312 } 2313 else if (checkClassFile && 2314 majorVersion == maxMajor && 2315 minorVersion > maxMinor) 2316 { 2317 printCCF("found.later.version", 2318 Integer.toString(minorVersion)); 2319 } 2320 indexPool(); 2321 if (signatureBuffer.length < bp) { 2322 int ns = Integer.highestOneBit(bp) << 1; 2323 signatureBuffer = new byte[ns]; 2324 } 2325 readClass(c); 2326 } 2327 2328 public void readClassFile(ClassSymbol c) { 2329 currentOwner = c; 2330 currentClassFile = c.classfile; 2331 warnedAttrs.clear(); 2332 filling = true; 2333 target = null; 2334 repeatable = null; 2335 try { 2336 bp = 0; 2337 buf = readInputStream(buf, c.classfile.openInputStream()); 2338 readClassBuffer(c); 2339 if (!missingTypeVariables.isEmpty() && !foundTypeVariables.isEmpty()) { 2340 List<Type> missing = missingTypeVariables; 2341 List<Type> found = foundTypeVariables; 2342 missingTypeVariables = List.nil(); 2343 foundTypeVariables = List.nil(); 2344 filling = false; 2345 ClassType ct = (ClassType)currentOwner.type; 2346 ct.supertype_field = 2347 types.subst(ct.supertype_field, missing, found); 2348 ct.interfaces_field = 2349 types.subst(ct.interfaces_field, missing, found); 2350 } else if (missingTypeVariables.isEmpty() != 2351 foundTypeVariables.isEmpty()) { 2352 Name name = missingTypeVariables.head.tsym.name; 2353 throw badClassFile("undecl.type.var", name); 2354 } 2355 2356 if ((c.flags_field & Flags.ANNOTATION) != 0) { 2357 c.setAnnotationTypeMetadata(new AnnotationTypeMetadata(c, new CompleterDeproxy(c, target, repeatable))); 2358 } else { 2359 c.setAnnotationTypeMetadata(AnnotationTypeMetadata.notAnAnnotationType()); 2360 } 2361 } catch (IOException ex) { 2362 throw badClassFile("unable.to.access.file", ex.getMessage()); 2363 } catch (ArrayIndexOutOfBoundsException ex) { 2364 throw badClassFile("bad.class.file", c.flatname); 2365 } finally { 2366 missingTypeVariables = List.nil(); 2367 foundTypeVariables = List.nil(); 2368 filling = false; 2369 } 2370 } 2371 // where 2372 private static byte[] readInputStream(byte[] buf, InputStream s) throws IOException { 2373 try { 2374 buf = ensureCapacity(buf, s.available()); 2375 int r = s.read(buf); 2376 int bp = 0; 2377 while (r != -1) { 2378 bp += r; 2379 buf = ensureCapacity(buf, bp); 2380 r = s.read(buf, bp, buf.length - bp); 2381 } 2382 return buf; 2383 } finally { 2384 try { 2385 s.close(); 2386 } catch (IOException e) { 2387 /* Ignore any errors, as this stream may have already 2388 * thrown a related exception which is the one that 2389 * should be reported. 2390 */ 2391 } 2392 } 2393 } 2394 /* 2395 * ensureCapacity will increase the buffer as needed, taking note that 2396 * the new buffer will always be greater than the needed and never 2397 * exactly equal to the needed size or bp. If equal then the read (above) 2398 * will infinitely loop as buf.length - bp == 0. 2399 */ 2400 private static byte[] ensureCapacity(byte[] buf, int needed) { 2401 if (buf.length <= needed) { 2402 byte[] old = buf; 2403 buf = new byte[Integer.highestOneBit(needed) << 1]; 2404 System.arraycopy(old, 0, buf, 0, old.length); 2405 } 2406 return buf; 2407 } 2408 2409 /** We can only read a single class file at a time; this 2410 * flag keeps track of when we are currently reading a class 2411 * file. 2412 */ 2413 public boolean filling = false; 2414 2415 /************************************************************************ 2416 * Adjusting flags 2417 ***********************************************************************/ 2418 2419 long adjustFieldFlags(long flags) { 2420 return flags; 2421 } 2422 2423 long adjustMethodFlags(long flags) { 2424 if ((flags & ACC_BRIDGE) != 0) { 2425 flags &= ~ACC_BRIDGE; 2426 flags |= BRIDGE; 2427 } 2428 if ((flags & ACC_VARARGS) != 0) { 2429 flags &= ~ACC_VARARGS; 2430 flags |= VARARGS; 2431 } 2432 return flags; 2433 } 2434 2435 long adjustClassFlags(long flags) { 2436 return flags & ~ACC_SUPER; // SUPER and SYNCHRONIZED bits overloaded 2437 } 2438 2439 /** Output for "-checkclassfile" option. 2440 * @param key The key to look up the correct internationalized string. 2441 * @param arg An argument for substitution into the output string. 2442 */ 2443 private void printCCF(String key, Object arg) { 2444 log.printLines(key, arg); 2445 } 2446 2447 /** 2448 * A subclass of JavaFileObject for the sourcefile attribute found in a classfile. 2449 * The attribute is only the last component of the original filename, so is unlikely 2450 * to be valid as is, so operations other than those to access the name throw 2451 * UnsupportedOperationException 2452 */ 2453 private static class SourceFileObject extends BaseFileObject { 2454 2455 /** The file's name. 2456 */ 2457 private Name name; 2458 private Name flatname; 2459 2460 public SourceFileObject(Name name, Name flatname) { 2461 super(null); // no file manager; never referenced for this file object 2462 this.name = name; 2463 this.flatname = flatname; 2464 } 2465 2466 @Override @DefinedBy(Api.COMPILER) 2467 public URI toUri() { 2468 try { 2469 return new URI(null, name.toString(), null); 2470 } catch (URISyntaxException e) { 2471 throw new CannotCreateUriError(name.toString(), e); 2472 } 2473 } 2474 2475 @Override @DefinedBy(Api.COMPILER) 2476 public String getName() { 2477 return name.toString(); 2478 } 2479 2480 @Override 2481 public String getShortName() { 2482 return getName(); 2483 } 2484 2485 @Override @DefinedBy(Api.COMPILER) 2486 public JavaFileObject.Kind getKind() { 2487 return getKind(getName()); 2488 } 2489 2490 @Override @DefinedBy(Api.COMPILER) 2491 public InputStream openInputStream() { 2492 throw new UnsupportedOperationException(); 2493 } 2494 2495 @Override @DefinedBy(Api.COMPILER) 2496 public OutputStream openOutputStream() { 2497 throw new UnsupportedOperationException(); 2498 } 2499 2500 @Override @DefinedBy(Api.COMPILER) 2501 public CharBuffer getCharContent(boolean ignoreEncodingErrors) { 2502 throw new UnsupportedOperationException(); 2503 } 2504 2505 @Override @DefinedBy(Api.COMPILER) 2506 public Reader openReader(boolean ignoreEncodingErrors) { 2507 throw new UnsupportedOperationException(); 2508 } 2509 2510 @Override @DefinedBy(Api.COMPILER) 2511 public Writer openWriter() { 2512 throw new UnsupportedOperationException(); 2513 } 2514 2515 @Override @DefinedBy(Api.COMPILER) 2516 public long getLastModified() { 2517 throw new UnsupportedOperationException(); 2518 } 2519 2520 @Override @DefinedBy(Api.COMPILER) 2521 public boolean delete() { 2522 throw new UnsupportedOperationException(); 2523 } 2524 2525 @Override 2526 protected String inferBinaryName(Iterable<? extends Path> path) { 2527 return flatname.toString(); 2528 } 2529 2530 @Override @DefinedBy(Api.COMPILER) 2531 public boolean isNameCompatible(String simpleName, JavaFileObject.Kind kind) { 2532 return true; // fail-safe mode 2533 } 2534 2535 /** 2536 * Check if two file objects are equal. 2537 * SourceFileObjects are just placeholder objects for the value of a 2538 * SourceFile attribute, and do not directly represent specific files. 2539 * Two SourceFileObjects are equal if their names are equal. 2540 */ 2541 @Override 2542 public boolean equals(Object other) { 2543 if (this == other) 2544 return true; 2545 2546 if (!(other instanceof SourceFileObject)) 2547 return false; 2548 2549 SourceFileObject o = (SourceFileObject) other; 2550 return name.equals(o.name); 2551 } 2552 2553 @Override 2554 public int hashCode() { 2555 return name.hashCode(); 2556 } 2557 } 2558 2559 private class CompleterDeproxy implements AnnotationTypeCompleter { 2560 ClassSymbol proxyOn; 2561 CompoundAnnotationProxy target; 2562 CompoundAnnotationProxy repeatable; 2563 2564 public CompleterDeproxy(ClassSymbol c, CompoundAnnotationProxy target, 2565 CompoundAnnotationProxy repeatable) 2566 { 2567 this.proxyOn = c; 2568 this.target = target; 2569 this.repeatable = repeatable; 2570 } 2571 2572 @Override 2573 public void complete(ClassSymbol sym) { 2574 Assert.check(proxyOn == sym); 2575 Attribute.Compound theTarget = null, theRepeatable = null; 2576 AnnotationDeproxy deproxy; 2577 2578 try { 2579 if (target != null) { 2580 deproxy = new AnnotationDeproxy(proxyOn); 2581 theTarget = deproxy.deproxyCompound(target); 2582 } 2583 2584 if (repeatable != null) { 2585 deproxy = new AnnotationDeproxy(proxyOn); 2586 theRepeatable = deproxy.deproxyCompound(repeatable); 2587 } 2588 } catch (Exception e) { 2589 throw new CompletionFailure(sym, e.getMessage()); 2590 } 2591 2592 sym.getAnnotationTypeMetadata().setTarget(theTarget); 2593 sym.getAnnotationTypeMetadata().setRepeatable(theRepeatable); 2594 } 2595 } 2596 }