ClassWriter.java revision 3155:30e288cb2d22
1/* 2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.tools.javac.jvm; 27 28import java.io.*; 29import java.util.LinkedHashMap; 30import java.util.Map; 31import java.util.Set; 32import java.util.HashSet; 33 34import javax.tools.JavaFileManager; 35import javax.tools.FileObject; 36import javax.tools.JavaFileObject; 37 38import com.sun.tools.javac.code.*; 39import com.sun.tools.javac.code.Attribute.RetentionPolicy; 40import com.sun.tools.javac.code.Symbol.*; 41import com.sun.tools.javac.code.Type.*; 42import com.sun.tools.javac.code.Types.UniqueType; 43import com.sun.tools.javac.file.PathFileObject; 44import com.sun.tools.javac.jvm.Pool.DynamicMethod; 45import com.sun.tools.javac.jvm.Pool.Method; 46import com.sun.tools.javac.jvm.Pool.MethodHandle; 47import com.sun.tools.javac.jvm.Pool.Variable; 48import com.sun.tools.javac.util.*; 49 50import static com.sun.tools.javac.code.Flags.*; 51import static com.sun.tools.javac.code.Kinds.Kind.*; 52import static com.sun.tools.javac.code.Scope.LookupKind.NON_RECURSIVE; 53import static com.sun.tools.javac.code.TypeTag.*; 54import static com.sun.tools.javac.main.Option.*; 55 56import static javax.tools.StandardLocation.CLASS_OUTPUT; 57 58/** This class provides operations to map an internal symbol table graph 59 * rooted in a ClassSymbol into a classfile. 60 * 61 * <p><b>This is NOT part of any supported API. 62 * If you write code that depends on this, you do so at your own risk. 63 * This code and its internal interfaces are subject to change or 64 * deletion without notice.</b> 65 */ 66public class ClassWriter extends ClassFile { 67 protected static final Context.Key<ClassWriter> classWriterKey = new Context.Key<>(); 68 69 private final Options options; 70 71 /** Switch: verbose output. 72 */ 73 private boolean verbose; 74 75 /** Switch: scramble private field names. 76 */ 77 private boolean scramble; 78 79 /** Switch: scramble all field names. 80 */ 81 private boolean scrambleAll; 82 83 /** Switch: retrofit mode. 84 */ 85 private boolean retrofit; 86 87 /** Switch: emit source file attribute. 88 */ 89 private boolean emitSourceFile; 90 91 /** Switch: generate CharacterRangeTable attribute. 92 */ 93 private boolean genCrt; 94 95 /** Switch: describe the generated stackmap. 96 */ 97 boolean debugstackmap; 98 99 /** 100 * Target class version. 101 */ 102 private Target target; 103 104 /** 105 * Source language version. 106 */ 107 private Source source; 108 109 /** Type utilities. */ 110 private Types types; 111 112 /** The initial sizes of the data and constant pool buffers. 113 * Sizes are increased when buffers get full. 114 */ 115 static final int DATA_BUF_SIZE = 0x0fff0; 116 static final int POOL_BUF_SIZE = 0x1fff0; 117 118 /** An output buffer for member info. 119 */ 120 ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE); 121 122 /** An output buffer for the constant pool. 123 */ 124 ByteBuffer poolbuf = new ByteBuffer(POOL_BUF_SIZE); 125 126 /** The constant pool. 127 */ 128 Pool pool; 129 130 /** The inner classes to be written, as a set. 131 */ 132 Set<ClassSymbol> innerClasses; 133 134 /** The inner classes to be written, as a queue where 135 * enclosing classes come first. 136 */ 137 ListBuffer<ClassSymbol> innerClassesQueue; 138 139 /** The bootstrap methods to be written in the corresponding class attribute 140 * (one for each invokedynamic) 141 */ 142 Map<DynamicMethod.BootstrapMethodsKey, DynamicMethod.BootstrapMethodsValue> bootstrapMethods; 143 144 /** The log to use for verbose output. 145 */ 146 private final Log log; 147 148 /** The name table. */ 149 private final Names names; 150 151 /** Access to files. */ 152 private final JavaFileManager fileManager; 153 154 /** Sole signature generator */ 155 private final CWSignatureGenerator signatureGen; 156 157 /** The tags and constants used in compressed stackmap. */ 158 static final int SAME_FRAME_SIZE = 64; 159 static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247; 160 static final int SAME_FRAME_EXTENDED = 251; 161 static final int FULL_FRAME = 255; 162 static final int MAX_LOCAL_LENGTH_DIFF = 4; 163 164 /** Get the ClassWriter instance for this context. */ 165 public static ClassWriter instance(Context context) { 166 ClassWriter instance = context.get(classWriterKey); 167 if (instance == null) 168 instance = new ClassWriter(context); 169 return instance; 170 } 171 172 /** Construct a class writer, given an options table. 173 */ 174 protected ClassWriter(Context context) { 175 context.put(classWriterKey, this); 176 177 log = Log.instance(context); 178 names = Names.instance(context); 179 options = Options.instance(context); 180 target = Target.instance(context); 181 source = Source.instance(context); 182 types = Types.instance(context); 183 fileManager = context.get(JavaFileManager.class); 184 signatureGen = new CWSignatureGenerator(types); 185 186 verbose = options.isSet(VERBOSE); 187 scramble = options.isSet("-scramble"); 188 scrambleAll = options.isSet("-scrambleAll"); 189 retrofit = options.isSet("-retrofit"); 190 genCrt = options.isSet(XJCOV); 191 debugstackmap = options.isSet("debugstackmap"); 192 193 emitSourceFile = options.isUnset(G_CUSTOM) || 194 options.isSet(G_CUSTOM, "source"); 195 196 String dumpModFlags = options.get("dumpmodifiers"); 197 dumpClassModifiers = 198 (dumpModFlags != null && dumpModFlags.indexOf('c') != -1); 199 dumpFieldModifiers = 200 (dumpModFlags != null && dumpModFlags.indexOf('f') != -1); 201 dumpInnerClassModifiers = 202 (dumpModFlags != null && dumpModFlags.indexOf('i') != -1); 203 dumpMethodModifiers = 204 (dumpModFlags != null && dumpModFlags.indexOf('m') != -1); 205 } 206 207/****************************************************************** 208 * Diagnostics: dump generated class names and modifiers 209 ******************************************************************/ 210 211 /** Value of option 'dumpmodifiers' is a string 212 * indicating which modifiers should be dumped for debugging: 213 * 'c' -- classes 214 * 'f' -- fields 215 * 'i' -- innerclass attributes 216 * 'm' -- methods 217 * For example, to dump everything: 218 * javac -XDdumpmodifiers=cifm MyProg.java 219 */ 220 private final boolean dumpClassModifiers; // -XDdumpmodifiers=c 221 private final boolean dumpFieldModifiers; // -XDdumpmodifiers=f 222 private final boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i 223 private final boolean dumpMethodModifiers; // -XDdumpmodifiers=m 224 225 226 /** Return flags as a string, separated by " ". 227 */ 228 public static String flagNames(long flags) { 229 StringBuilder sbuf = new StringBuilder(); 230 int i = 0; 231 long f = flags & StandardFlags; 232 while (f != 0) { 233 if ((f & 1) != 0) { 234 sbuf.append(" "); 235 sbuf.append(flagName[i]); 236 } 237 f = f >> 1; 238 i++; 239 } 240 return sbuf.toString(); 241 } 242 //where 243 private final static String[] flagName = { 244 "PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL", 245 "SUPER", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE", 246 "ABSTRACT", "STRICTFP"}; 247 248/****************************************************************** 249 * Output routines 250 ******************************************************************/ 251 252 /** Write a character into given byte buffer; 253 * byte buffer will not be grown. 254 */ 255 void putChar(ByteBuffer buf, int op, int x) { 256 buf.elems[op ] = (byte)((x >> 8) & 0xFF); 257 buf.elems[op+1] = (byte)((x ) & 0xFF); 258 } 259 260 /** Write an integer into given byte buffer; 261 * byte buffer will not be grown. 262 */ 263 void putInt(ByteBuffer buf, int adr, int x) { 264 buf.elems[adr ] = (byte)((x >> 24) & 0xFF); 265 buf.elems[adr+1] = (byte)((x >> 16) & 0xFF); 266 buf.elems[adr+2] = (byte)((x >> 8) & 0xFF); 267 buf.elems[adr+3] = (byte)((x ) & 0xFF); 268 } 269 270 /** 271 * Signature Generation 272 */ 273 private class CWSignatureGenerator extends Types.SignatureGenerator { 274 275 /** 276 * An output buffer for type signatures. 277 */ 278 ByteBuffer sigbuf = new ByteBuffer(); 279 280 CWSignatureGenerator(Types types) { 281 super(types); 282 } 283 284 /** 285 * Assemble signature of given type in string buffer. 286 * Check for uninitialized types before calling the general case. 287 */ 288 @Override 289 public void assembleSig(Type type) { 290 switch (type.getTag()) { 291 case UNINITIALIZED_THIS: 292 case UNINITIALIZED_OBJECT: 293 // we don't yet have a spec for uninitialized types in the 294 // local variable table 295 assembleSig(types.erasure(((UninitializedType)type).qtype)); 296 break; 297 default: 298 super.assembleSig(type); 299 } 300 } 301 302 @Override 303 protected void append(char ch) { 304 sigbuf.appendByte(ch); 305 } 306 307 @Override 308 protected void append(byte[] ba) { 309 sigbuf.appendBytes(ba); 310 } 311 312 @Override 313 protected void append(Name name) { 314 sigbuf.appendName(name); 315 } 316 317 @Override 318 protected void classReference(ClassSymbol c) { 319 enterInner(c); 320 } 321 322 private void reset() { 323 sigbuf.reset(); 324 } 325 326 private Name toName() { 327 return sigbuf.toName(names); 328 } 329 330 private boolean isEmpty() { 331 return sigbuf.length == 0; 332 } 333 } 334 335 /** 336 * Return signature of given type 337 */ 338 Name typeSig(Type type) { 339 Assert.check(signatureGen.isEmpty()); 340 //- System.out.println(" ? " + type); 341 signatureGen.assembleSig(type); 342 Name n = signatureGen.toName(); 343 signatureGen.reset(); 344 //- System.out.println(" " + n); 345 return n; 346 } 347 348 /** Given a type t, return the extended class name of its erasure in 349 * external representation. 350 */ 351 public Name xClassName(Type t) { 352 if (t.hasTag(CLASS)) { 353 return names.fromUtf(externalize(t.tsym.flatName())); 354 } else if (t.hasTag(ARRAY)) { 355 return typeSig(types.erasure(t)); 356 } else { 357 throw new AssertionError("xClassName expects class or array type, got " + t); 358 } 359 } 360 361/****************************************************************** 362 * Writing the Constant Pool 363 ******************************************************************/ 364 365 /** Thrown when the constant pool is over full. 366 */ 367 public static class PoolOverflow extends Exception { 368 private static final long serialVersionUID = 0; 369 public PoolOverflow() {} 370 } 371 public static class StringOverflow extends Exception { 372 private static final long serialVersionUID = 0; 373 public final String value; 374 public StringOverflow(String s) { 375 value = s; 376 } 377 } 378 379 /** Write constant pool to pool buffer. 380 * Note: during writing, constant pool 381 * might grow since some parts of constants still need to be entered. 382 */ 383 void writePool(Pool pool) throws PoolOverflow, StringOverflow { 384 int poolCountIdx = poolbuf.length; 385 poolbuf.appendChar(0); 386 int i = 1; 387 while (i < pool.pp) { 388 Object value = pool.pool[i]; 389 Assert.checkNonNull(value); 390 if (value instanceof Method || value instanceof Variable) 391 value = ((DelegatedSymbol)value).getUnderlyingSymbol(); 392 393 if (value instanceof MethodSymbol) { 394 MethodSymbol m = (MethodSymbol)value; 395 if (!m.isDynamic()) { 396 poolbuf.appendByte((m.owner.flags() & INTERFACE) != 0 397 ? CONSTANT_InterfaceMethodref 398 : CONSTANT_Methodref); 399 poolbuf.appendChar(pool.put(m.owner)); 400 poolbuf.appendChar(pool.put(nameType(m))); 401 } else { 402 //invokedynamic 403 DynamicMethodSymbol dynSym = (DynamicMethodSymbol)m; 404 MethodHandle handle = new MethodHandle(dynSym.bsmKind, dynSym.bsm, types); 405 DynamicMethod.BootstrapMethodsKey key = new DynamicMethod.BootstrapMethodsKey(dynSym, types); 406 407 // Figure out the index for existing BSM; create a new BSM if no key 408 DynamicMethod.BootstrapMethodsValue val = bootstrapMethods.get(key); 409 if (val == null) { 410 int index = bootstrapMethods.size(); 411 val = new DynamicMethod.BootstrapMethodsValue(handle, index); 412 bootstrapMethods.put(key, val); 413 } 414 415 //init cp entries 416 pool.put(names.BootstrapMethods); 417 pool.put(handle); 418 for (Object staticArg : dynSym.staticArgs) { 419 pool.put(staticArg); 420 } 421 poolbuf.appendByte(CONSTANT_InvokeDynamic); 422 poolbuf.appendChar(val.index); 423 poolbuf.appendChar(pool.put(nameType(dynSym))); 424 } 425 } else if (value instanceof VarSymbol) { 426 VarSymbol v = (VarSymbol)value; 427 poolbuf.appendByte(CONSTANT_Fieldref); 428 poolbuf.appendChar(pool.put(v.owner)); 429 poolbuf.appendChar(pool.put(nameType(v))); 430 } else if (value instanceof Name) { 431 poolbuf.appendByte(CONSTANT_Utf8); 432 byte[] bs = ((Name)value).toUtf(); 433 poolbuf.appendChar(bs.length); 434 poolbuf.appendBytes(bs, 0, bs.length); 435 if (bs.length > Pool.MAX_STRING_LENGTH) 436 throw new StringOverflow(value.toString()); 437 } else if (value instanceof ClassSymbol) { 438 ClassSymbol c = (ClassSymbol)value; 439 if (c.owner.kind == TYP) pool.put(c.owner); 440 poolbuf.appendByte(CONSTANT_Class); 441 if (c.type.hasTag(ARRAY)) { 442 poolbuf.appendChar(pool.put(typeSig(c.type))); 443 } else { 444 poolbuf.appendChar(pool.put(names.fromUtf(externalize(c.flatname)))); 445 enterInner(c); 446 } 447 } else if (value instanceof NameAndType) { 448 NameAndType nt = (NameAndType)value; 449 poolbuf.appendByte(CONSTANT_NameandType); 450 poolbuf.appendChar(pool.put(nt.name)); 451 poolbuf.appendChar(pool.put(typeSig(nt.uniqueType.type))); 452 } else if (value instanceof Integer) { 453 poolbuf.appendByte(CONSTANT_Integer); 454 poolbuf.appendInt(((Integer)value).intValue()); 455 } else if (value instanceof Long) { 456 poolbuf.appendByte(CONSTANT_Long); 457 poolbuf.appendLong(((Long)value).longValue()); 458 i++; 459 } else if (value instanceof Float) { 460 poolbuf.appendByte(CONSTANT_Float); 461 poolbuf.appendFloat(((Float)value).floatValue()); 462 } else if (value instanceof Double) { 463 poolbuf.appendByte(CONSTANT_Double); 464 poolbuf.appendDouble(((Double)value).doubleValue()); 465 i++; 466 } else if (value instanceof String) { 467 poolbuf.appendByte(CONSTANT_String); 468 poolbuf.appendChar(pool.put(names.fromString((String)value))); 469 } else if (value instanceof UniqueType) { 470 Type type = ((UniqueType)value).type; 471 if (type.hasTag(METHOD)) { 472 poolbuf.appendByte(CONSTANT_MethodType); 473 poolbuf.appendChar(pool.put(typeSig((MethodType)type))); 474 } else { 475 Assert.check(type.hasTag(ARRAY)); 476 poolbuf.appendByte(CONSTANT_Class); 477 poolbuf.appendChar(pool.put(xClassName(type))); 478 } 479 } else if (value instanceof MethodHandle) { 480 MethodHandle ref = (MethodHandle)value; 481 poolbuf.appendByte(CONSTANT_MethodHandle); 482 poolbuf.appendByte(ref.refKind); 483 poolbuf.appendChar(pool.put(ref.refSym)); 484 } else { 485 Assert.error("writePool " + value); 486 } 487 i++; 488 } 489 if (pool.pp > Pool.MAX_ENTRIES) 490 throw new PoolOverflow(); 491 putChar(poolbuf, poolCountIdx, pool.pp); 492 } 493 494 /** Given a field, return its name. 495 */ 496 Name fieldName(Symbol sym) { 497 if (scramble && (sym.flags() & PRIVATE) != 0 || 498 scrambleAll && (sym.flags() & (PROTECTED | PUBLIC)) == 0) 499 return names.fromString("_$" + sym.name.getIndex()); 500 else 501 return sym.name; 502 } 503 504 /** Given a symbol, return its name-and-type. 505 */ 506 NameAndType nameType(Symbol sym) { 507 return new NameAndType(fieldName(sym), 508 retrofit 509 ? sym.erasure(types) 510 : sym.externalType(types), types); 511 // if we retrofit, then the NameAndType has been read in as is 512 // and no change is necessary. If we compile normally, the 513 // NameAndType is generated from a symbol reference, and the 514 // adjustment of adding an additional this$n parameter needs to be made. 515 } 516 517/****************************************************************** 518 * Writing Attributes 519 ******************************************************************/ 520 521 /** Write header for an attribute to data buffer and return 522 * position past attribute length index. 523 */ 524 int writeAttr(Name attrName) { 525 databuf.appendChar(pool.put(attrName)); 526 databuf.appendInt(0); 527 return databuf.length; 528 } 529 530 /** Fill in attribute length. 531 */ 532 void endAttr(int index) { 533 putInt(databuf, index - 4, databuf.length - index); 534 } 535 536 /** Leave space for attribute count and return index for 537 * number of attributes field. 538 */ 539 int beginAttrs() { 540 databuf.appendChar(0); 541 return databuf.length; 542 } 543 544 /** Fill in number of attributes. 545 */ 546 void endAttrs(int index, int count) { 547 putChar(databuf, index - 2, count); 548 } 549 550 /** Write the EnclosingMethod attribute if needed. 551 * Returns the number of attributes written (0 or 1). 552 */ 553 int writeEnclosingMethodAttribute(ClassSymbol c) { 554 return writeEnclosingMethodAttribute(names.EnclosingMethod, c); 555 } 556 557 /** Write the EnclosingMethod attribute with a specified name. 558 * Returns the number of attributes written (0 or 1). 559 */ 560 protected int writeEnclosingMethodAttribute(Name attributeName, ClassSymbol c) { 561 if (c.owner.kind != MTH && // neither a local class 562 c.name != names.empty) // nor anonymous 563 return 0; 564 565 int alenIdx = writeAttr(attributeName); 566 ClassSymbol enclClass = c.owner.enclClass(); 567 MethodSymbol enclMethod = 568 (c.owner.type == null // local to init block 569 || c.owner.kind != MTH) // or member init 570 ? null 571 : (MethodSymbol)c.owner; 572 databuf.appendChar(pool.put(enclClass)); 573 databuf.appendChar(enclMethod == null ? 0 : pool.put(nameType(c.owner))); 574 endAttr(alenIdx); 575 return 1; 576 } 577 578 /** Write flag attributes; return number of attributes written. 579 */ 580 int writeFlagAttrs(long flags) { 581 int acount = 0; 582 if ((flags & DEPRECATED) != 0) { 583 int alenIdx = writeAttr(names.Deprecated); 584 endAttr(alenIdx); 585 acount++; 586 } 587 return acount; 588 } 589 590 /** Write member (field or method) attributes; 591 * return number of attributes written. 592 */ 593 int writeMemberAttrs(Symbol sym) { 594 int acount = writeFlagAttrs(sym.flags()); 595 long flags = sym.flags(); 596 if ((flags & (SYNTHETIC | BRIDGE)) != SYNTHETIC && 597 (flags & ANONCONSTR) == 0 && 598 (!types.isSameType(sym.type, sym.erasure(types)) || 599 signatureGen.hasTypeVar(sym.type.getThrownTypes()))) { 600 // note that a local class with captured variables 601 // will get a signature attribute 602 int alenIdx = writeAttr(names.Signature); 603 databuf.appendChar(pool.put(typeSig(sym.type))); 604 endAttr(alenIdx); 605 acount++; 606 } 607 acount += writeJavaAnnotations(sym.getRawAttributes()); 608 acount += writeTypeAnnotations(sym.getRawTypeAttributes(), false); 609 return acount; 610 } 611 612 /** 613 * Write method parameter names attribute. 614 */ 615 int writeMethodParametersAttr(MethodSymbol m) { 616 MethodType ty = m.externalType(types).asMethodType(); 617 final int allparams = ty.argtypes.size(); 618 if (m.params != null && allparams != 0) { 619 final int attrIndex = writeAttr(names.MethodParameters); 620 databuf.appendByte(allparams); 621 // Write extra parameters first 622 for (VarSymbol s : m.extraParams) { 623 final int flags = 624 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) | 625 ((int) m.flags() & SYNTHETIC); 626 databuf.appendChar(pool.put(s.name)); 627 databuf.appendChar(flags); 628 } 629 // Now write the real parameters 630 for (VarSymbol s : m.params) { 631 final int flags = 632 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) | 633 ((int) m.flags() & SYNTHETIC); 634 databuf.appendChar(pool.put(s.name)); 635 databuf.appendChar(flags); 636 } 637 // Now write the captured locals 638 for (VarSymbol s : m.capturedLocals) { 639 final int flags = 640 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) | 641 ((int) m.flags() & SYNTHETIC); 642 databuf.appendChar(pool.put(s.name)); 643 databuf.appendChar(flags); 644 } 645 endAttr(attrIndex); 646 return 1; 647 } else 648 return 0; 649 } 650 651 652 private void writeParamAnnotations(List<VarSymbol> params, 653 RetentionPolicy retention) { 654 for (VarSymbol s : params) { 655 ListBuffer<Attribute.Compound> buf = new ListBuffer<>(); 656 for (Attribute.Compound a : s.getRawAttributes()) 657 if (types.getRetention(a) == retention) 658 buf.append(a); 659 databuf.appendChar(buf.length()); 660 for (Attribute.Compound a : buf) 661 writeCompoundAttribute(a); 662 } 663 664 } 665 666 private void writeParamAnnotations(MethodSymbol m, 667 RetentionPolicy retention) { 668 databuf.appendByte(m.params.length()); 669 writeParamAnnotations(m.params, retention); 670 } 671 672 /** Write method parameter annotations; 673 * return number of attributes written. 674 */ 675 int writeParameterAttrs(MethodSymbol m) { 676 boolean hasVisible = false; 677 boolean hasInvisible = false; 678 if (m.params != null) { 679 for (VarSymbol s : m.params) { 680 for (Attribute.Compound a : s.getRawAttributes()) { 681 switch (types.getRetention(a)) { 682 case SOURCE: break; 683 case CLASS: hasInvisible = true; break; 684 case RUNTIME: hasVisible = true; break; 685 default: // /* fail soft */ throw new AssertionError(vis); 686 } 687 } 688 } 689 } 690 691 int attrCount = 0; 692 if (hasVisible) { 693 int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations); 694 writeParamAnnotations(m, RetentionPolicy.RUNTIME); 695 endAttr(attrIndex); 696 attrCount++; 697 } 698 if (hasInvisible) { 699 int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations); 700 writeParamAnnotations(m, RetentionPolicy.CLASS); 701 endAttr(attrIndex); 702 attrCount++; 703 } 704 return attrCount; 705 } 706 707/********************************************************************** 708 * Writing Java-language annotations (aka metadata, attributes) 709 **********************************************************************/ 710 711 /** Write Java-language annotations; return number of JVM 712 * attributes written (zero or one). 713 */ 714 int writeJavaAnnotations(List<Attribute.Compound> attrs) { 715 if (attrs.isEmpty()) return 0; 716 ListBuffer<Attribute.Compound> visibles = new ListBuffer<>(); 717 ListBuffer<Attribute.Compound> invisibles = new ListBuffer<>(); 718 for (Attribute.Compound a : attrs) { 719 switch (types.getRetention(a)) { 720 case SOURCE: break; 721 case CLASS: invisibles.append(a); break; 722 case RUNTIME: visibles.append(a); break; 723 default: // /* fail soft */ throw new AssertionError(vis); 724 } 725 } 726 727 int attrCount = 0; 728 if (visibles.length() != 0) { 729 int attrIndex = writeAttr(names.RuntimeVisibleAnnotations); 730 databuf.appendChar(visibles.length()); 731 for (Attribute.Compound a : visibles) 732 writeCompoundAttribute(a); 733 endAttr(attrIndex); 734 attrCount++; 735 } 736 if (invisibles.length() != 0) { 737 int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations); 738 databuf.appendChar(invisibles.length()); 739 for (Attribute.Compound a : invisibles) 740 writeCompoundAttribute(a); 741 endAttr(attrIndex); 742 attrCount++; 743 } 744 return attrCount; 745 } 746 747 int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos, boolean inCode) { 748 if (typeAnnos.isEmpty()) return 0; 749 750 ListBuffer<Attribute.TypeCompound> visibles = new ListBuffer<>(); 751 ListBuffer<Attribute.TypeCompound> invisibles = new ListBuffer<>(); 752 753 for (Attribute.TypeCompound tc : typeAnnos) { 754 if (tc.hasUnknownPosition()) { 755 boolean fixed = tc.tryFixPosition(); 756 757 // Could we fix it? 758 if (!fixed) { 759 // This happens for nested types like @A Outer. @B Inner. 760 // For method parameters we get the annotation twice! Once with 761 // a valid position, once unknown. 762 // TODO: find a cleaner solution. 763 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 764 pw.println("ClassWriter: Position UNKNOWN in type annotation: " + tc); 765 continue; 766 } 767 } 768 769 if (tc.position.type.isLocal() != inCode) 770 continue; 771 if (!tc.position.emitToClassfile()) 772 continue; 773 switch (types.getRetention(tc)) { 774 case SOURCE: break; 775 case CLASS: invisibles.append(tc); break; 776 case RUNTIME: visibles.append(tc); break; 777 default: // /* fail soft */ throw new AssertionError(vis); 778 } 779 } 780 781 int attrCount = 0; 782 if (visibles.length() != 0) { 783 int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations); 784 databuf.appendChar(visibles.length()); 785 for (Attribute.TypeCompound p : visibles) 786 writeTypeAnnotation(p); 787 endAttr(attrIndex); 788 attrCount++; 789 } 790 791 if (invisibles.length() != 0) { 792 int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations); 793 databuf.appendChar(invisibles.length()); 794 for (Attribute.TypeCompound p : invisibles) 795 writeTypeAnnotation(p); 796 endAttr(attrIndex); 797 attrCount++; 798 } 799 800 return attrCount; 801 } 802 803 /** A visitor to write an attribute including its leading 804 * single-character marker. 805 */ 806 class AttributeWriter implements Attribute.Visitor { 807 public void visitConstant(Attribute.Constant _value) { 808 Object value = _value.value; 809 switch (_value.type.getTag()) { 810 case BYTE: 811 databuf.appendByte('B'); 812 break; 813 case CHAR: 814 databuf.appendByte('C'); 815 break; 816 case SHORT: 817 databuf.appendByte('S'); 818 break; 819 case INT: 820 databuf.appendByte('I'); 821 break; 822 case LONG: 823 databuf.appendByte('J'); 824 break; 825 case FLOAT: 826 databuf.appendByte('F'); 827 break; 828 case DOUBLE: 829 databuf.appendByte('D'); 830 break; 831 case BOOLEAN: 832 databuf.appendByte('Z'); 833 break; 834 case CLASS: 835 Assert.check(value instanceof String); 836 databuf.appendByte('s'); 837 value = names.fromString(value.toString()); // CONSTANT_Utf8 838 break; 839 default: 840 throw new AssertionError(_value.type); 841 } 842 databuf.appendChar(pool.put(value)); 843 } 844 public void visitEnum(Attribute.Enum e) { 845 databuf.appendByte('e'); 846 databuf.appendChar(pool.put(typeSig(e.value.type))); 847 databuf.appendChar(pool.put(e.value.name)); 848 } 849 public void visitClass(Attribute.Class clazz) { 850 databuf.appendByte('c'); 851 databuf.appendChar(pool.put(typeSig(clazz.classType))); 852 } 853 public void visitCompound(Attribute.Compound compound) { 854 databuf.appendByte('@'); 855 writeCompoundAttribute(compound); 856 } 857 public void visitError(Attribute.Error x) { 858 throw new AssertionError(x); 859 } 860 public void visitArray(Attribute.Array array) { 861 databuf.appendByte('['); 862 databuf.appendChar(array.values.length); 863 for (Attribute a : array.values) { 864 a.accept(this); 865 } 866 } 867 } 868 AttributeWriter awriter = new AttributeWriter(); 869 870 /** Write a compound attribute excluding the '@' marker. */ 871 void writeCompoundAttribute(Attribute.Compound c) { 872 databuf.appendChar(pool.put(typeSig(c.type))); 873 databuf.appendChar(c.values.length()); 874 for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) { 875 databuf.appendChar(pool.put(p.fst.name)); 876 p.snd.accept(awriter); 877 } 878 } 879 880 void writeTypeAnnotation(Attribute.TypeCompound c) { 881 writePosition(c.position); 882 writeCompoundAttribute(c); 883 } 884 885 void writePosition(TypeAnnotationPosition p) { 886 databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte 887 switch (p.type) { 888 // instanceof 889 case INSTANCEOF: 890 // new expression 891 case NEW: 892 // constructor/method reference receiver 893 case CONSTRUCTOR_REFERENCE: 894 case METHOD_REFERENCE: 895 databuf.appendChar(p.offset); 896 break; 897 // local variable 898 case LOCAL_VARIABLE: 899 // resource variable 900 case RESOURCE_VARIABLE: 901 databuf.appendChar(p.lvarOffset.length); // for table length 902 for (int i = 0; i < p.lvarOffset.length; ++i) { 903 databuf.appendChar(p.lvarOffset[i]); 904 databuf.appendChar(p.lvarLength[i]); 905 databuf.appendChar(p.lvarIndex[i]); 906 } 907 break; 908 // exception parameter 909 case EXCEPTION_PARAMETER: 910 databuf.appendChar(p.getExceptionIndex()); 911 break; 912 // method receiver 913 case METHOD_RECEIVER: 914 // Do nothing 915 break; 916 // type parameter 917 case CLASS_TYPE_PARAMETER: 918 case METHOD_TYPE_PARAMETER: 919 databuf.appendByte(p.parameter_index); 920 break; 921 // type parameter bound 922 case CLASS_TYPE_PARAMETER_BOUND: 923 case METHOD_TYPE_PARAMETER_BOUND: 924 databuf.appendByte(p.parameter_index); 925 databuf.appendByte(p.bound_index); 926 break; 927 // class extends or implements clause 928 case CLASS_EXTENDS: 929 databuf.appendChar(p.type_index); 930 break; 931 // throws 932 case THROWS: 933 databuf.appendChar(p.type_index); 934 break; 935 // method parameter 936 case METHOD_FORMAL_PARAMETER: 937 databuf.appendByte(p.parameter_index); 938 break; 939 // type cast 940 case CAST: 941 // method/constructor/reference type argument 942 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT: 943 case METHOD_INVOCATION_TYPE_ARGUMENT: 944 case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT: 945 case METHOD_REFERENCE_TYPE_ARGUMENT: 946 databuf.appendChar(p.offset); 947 databuf.appendByte(p.type_index); 948 break; 949 // We don't need to worry about these 950 case METHOD_RETURN: 951 case FIELD: 952 break; 953 case UNKNOWN: 954 throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!"); 955 default: 956 throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p); 957 } 958 959 { // Append location data for generics/arrays. 960 databuf.appendByte(p.location.size()); 961 java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location); 962 for (int i : loc) 963 databuf.appendByte((byte)i); 964 } 965 } 966 967/********************************************************************** 968 * Writing Objects 969 **********************************************************************/ 970 971 /** Enter an inner class into the `innerClasses' set/queue. 972 */ 973 void enterInner(ClassSymbol c) { 974 if (c.type.isCompound()) { 975 throw new AssertionError("Unexpected intersection type: " + c.type); 976 } 977 try { 978 c.complete(); 979 } catch (CompletionFailure ex) { 980 System.err.println("error: " + c + ": " + ex.getMessage()); 981 throw ex; 982 } 983 if (!c.type.hasTag(CLASS)) return; // arrays 984 if (pool != null && // pool might be null if called from xClassName 985 c.owner.enclClass() != null && 986 (innerClasses == null || !innerClasses.contains(c))) { 987// log.errWriter.println("enter inner " + c);//DEBUG 988 enterInner(c.owner.enclClass()); 989 pool.put(c); 990 if (c.name != names.empty) 991 pool.put(c.name); 992 if (innerClasses == null) { 993 innerClasses = new HashSet<>(); 994 innerClassesQueue = new ListBuffer<>(); 995 pool.put(names.InnerClasses); 996 } 997 innerClasses.add(c); 998 innerClassesQueue.append(c); 999 } 1000 } 1001 1002 /** Write "inner classes" attribute. 1003 */ 1004 void writeInnerClasses() { 1005 int alenIdx = writeAttr(names.InnerClasses); 1006 databuf.appendChar(innerClassesQueue.length()); 1007 for (List<ClassSymbol> l = innerClassesQueue.toList(); 1008 l.nonEmpty(); 1009 l = l.tail) { 1010 ClassSymbol inner = l.head; 1011 inner.markAbstractIfNeeded(types); 1012 char flags = (char) adjustFlags(inner.flags_field); 1013 if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT 1014 if (inner.name.isEmpty()) flags &= ~FINAL; // Anonymous class: unset FINAL flag 1015 flags &= ~STRICTFP; //inner classes should not have the strictfp flag set. 1016 if (dumpInnerClassModifiers) { 1017 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1018 pw.println("INNERCLASS " + inner.name); 1019 pw.println("---" + flagNames(flags)); 1020 } 1021 databuf.appendChar(pool.get(inner)); 1022 databuf.appendChar( 1023 inner.owner.kind == TYP && !inner.name.isEmpty() ? pool.get(inner.owner) : 0); 1024 databuf.appendChar( 1025 !inner.name.isEmpty() ? pool.get(inner.name) : 0); 1026 databuf.appendChar(flags); 1027 } 1028 endAttr(alenIdx); 1029 } 1030 1031 /** Write "bootstrapMethods" attribute. 1032 */ 1033 void writeBootstrapMethods() { 1034 int alenIdx = writeAttr(names.BootstrapMethods); 1035 databuf.appendChar(bootstrapMethods.size()); 1036 for (Map.Entry<DynamicMethod.BootstrapMethodsKey, DynamicMethod.BootstrapMethodsValue> entry : bootstrapMethods.entrySet()) { 1037 DynamicMethod.BootstrapMethodsKey bsmKey = entry.getKey(); 1038 //write BSM handle 1039 databuf.appendChar(pool.get(entry.getValue().mh)); 1040 Object[] uniqueArgs = bsmKey.getUniqueArgs(); 1041 //write static args length 1042 databuf.appendChar(uniqueArgs.length); 1043 //write static args array 1044 for (Object o : uniqueArgs) { 1045 databuf.appendChar(pool.get(o)); 1046 } 1047 } 1048 endAttr(alenIdx); 1049 } 1050 1051 /** Write field symbol, entering all references into constant pool. 1052 */ 1053 void writeField(VarSymbol v) { 1054 int flags = adjustFlags(v.flags()); 1055 databuf.appendChar(flags); 1056 if (dumpFieldModifiers) { 1057 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1058 pw.println("FIELD " + fieldName(v)); 1059 pw.println("---" + flagNames(v.flags())); 1060 } 1061 databuf.appendChar(pool.put(fieldName(v))); 1062 databuf.appendChar(pool.put(typeSig(v.erasure(types)))); 1063 int acountIdx = beginAttrs(); 1064 int acount = 0; 1065 if (v.getConstValue() != null) { 1066 int alenIdx = writeAttr(names.ConstantValue); 1067 databuf.appendChar(pool.put(v.getConstValue())); 1068 endAttr(alenIdx); 1069 acount++; 1070 } 1071 acount += writeMemberAttrs(v); 1072 endAttrs(acountIdx, acount); 1073 } 1074 1075 /** Write method symbol, entering all references into constant pool. 1076 */ 1077 void writeMethod(MethodSymbol m) { 1078 int flags = adjustFlags(m.flags()); 1079 databuf.appendChar(flags); 1080 if (dumpMethodModifiers) { 1081 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1082 pw.println("METHOD " + fieldName(m)); 1083 pw.println("---" + flagNames(m.flags())); 1084 } 1085 databuf.appendChar(pool.put(fieldName(m))); 1086 databuf.appendChar(pool.put(typeSig(m.externalType(types)))); 1087 int acountIdx = beginAttrs(); 1088 int acount = 0; 1089 if (m.code != null) { 1090 int alenIdx = writeAttr(names.Code); 1091 writeCode(m.code); 1092 m.code = null; // to conserve space 1093 endAttr(alenIdx); 1094 acount++; 1095 } 1096 List<Type> thrown = m.erasure(types).getThrownTypes(); 1097 if (thrown.nonEmpty()) { 1098 int alenIdx = writeAttr(names.Exceptions); 1099 databuf.appendChar(thrown.length()); 1100 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail) 1101 databuf.appendChar(pool.put(l.head.tsym)); 1102 endAttr(alenIdx); 1103 acount++; 1104 } 1105 if (m.defaultValue != null) { 1106 int alenIdx = writeAttr(names.AnnotationDefault); 1107 m.defaultValue.accept(awriter); 1108 endAttr(alenIdx); 1109 acount++; 1110 } 1111 if (options.isSet(PARAMETERS)) { 1112 if (!m.isLambdaMethod()) // Per JDK-8138729, do not emit parameters table for lambda bodies. 1113 acount += writeMethodParametersAttr(m); 1114 } 1115 acount += writeMemberAttrs(m); 1116 if (!m.isLambdaMethod()) 1117 acount += writeParameterAttrs(m); 1118 endAttrs(acountIdx, acount); 1119 } 1120 1121 /** Write code attribute of method. 1122 */ 1123 void writeCode(Code code) { 1124 databuf.appendChar(code.max_stack); 1125 databuf.appendChar(code.max_locals); 1126 databuf.appendInt(code.cp); 1127 databuf.appendBytes(code.code, 0, code.cp); 1128 databuf.appendChar(code.catchInfo.length()); 1129 for (List<char[]> l = code.catchInfo.toList(); 1130 l.nonEmpty(); 1131 l = l.tail) { 1132 for (int i = 0; i < l.head.length; i++) 1133 databuf.appendChar(l.head[i]); 1134 } 1135 int acountIdx = beginAttrs(); 1136 int acount = 0; 1137 1138 if (code.lineInfo.nonEmpty()) { 1139 int alenIdx = writeAttr(names.LineNumberTable); 1140 databuf.appendChar(code.lineInfo.length()); 1141 for (List<char[]> l = code.lineInfo.reverse(); 1142 l.nonEmpty(); 1143 l = l.tail) 1144 for (int i = 0; i < l.head.length; i++) 1145 databuf.appendChar(l.head[i]); 1146 endAttr(alenIdx); 1147 acount++; 1148 } 1149 1150 if (genCrt && (code.crt != null)) { 1151 CRTable crt = code.crt; 1152 int alenIdx = writeAttr(names.CharacterRangeTable); 1153 int crtIdx = beginAttrs(); 1154 int crtEntries = crt.writeCRT(databuf, code.lineMap, log); 1155 endAttrs(crtIdx, crtEntries); 1156 endAttr(alenIdx); 1157 acount++; 1158 } 1159 1160 // counter for number of generic local variables 1161 if (code.varDebugInfo && code.varBufferSize > 0) { 1162 int nGenericVars = 0; 1163 int alenIdx = writeAttr(names.LocalVariableTable); 1164 databuf.appendChar(code.getLVTSize()); 1165 for (int i=0; i<code.varBufferSize; i++) { 1166 Code.LocalVar var = code.varBuffer[i]; 1167 1168 for (Code.LocalVar.Range r: var.aliveRanges) { 1169 // write variable info 1170 Assert.check(r.start_pc >= 0 1171 && r.start_pc <= code.cp); 1172 databuf.appendChar(r.start_pc); 1173 Assert.check(r.length > 0 1174 && (r.start_pc + r.length) <= code.cp); 1175 databuf.appendChar(r.length); 1176 VarSymbol sym = var.sym; 1177 databuf.appendChar(pool.put(sym.name)); 1178 Type vartype = sym.erasure(types); 1179 databuf.appendChar(pool.put(typeSig(vartype))); 1180 databuf.appendChar(var.reg); 1181 if (needsLocalVariableTypeEntry(var.sym.type)) { 1182 nGenericVars++; 1183 } 1184 } 1185 } 1186 endAttr(alenIdx); 1187 acount++; 1188 1189 if (nGenericVars > 0) { 1190 alenIdx = writeAttr(names.LocalVariableTypeTable); 1191 databuf.appendChar(nGenericVars); 1192 int count = 0; 1193 1194 for (int i=0; i<code.varBufferSize; i++) { 1195 Code.LocalVar var = code.varBuffer[i]; 1196 VarSymbol sym = var.sym; 1197 if (!needsLocalVariableTypeEntry(sym.type)) 1198 continue; 1199 for (Code.LocalVar.Range r : var.aliveRanges) { 1200 // write variable info 1201 databuf.appendChar(r.start_pc); 1202 databuf.appendChar(r.length); 1203 databuf.appendChar(pool.put(sym.name)); 1204 databuf.appendChar(pool.put(typeSig(sym.type))); 1205 databuf.appendChar(var.reg); 1206 count++; 1207 } 1208 } 1209 Assert.check(count == nGenericVars); 1210 endAttr(alenIdx); 1211 acount++; 1212 } 1213 } 1214 1215 if (code.stackMapBufferSize > 0) { 1216 if (debugstackmap) System.out.println("Stack map for " + code.meth); 1217 int alenIdx = writeAttr(code.stackMap.getAttributeName(names)); 1218 writeStackMap(code); 1219 endAttr(alenIdx); 1220 acount++; 1221 } 1222 1223 acount += writeTypeAnnotations(code.meth.getRawTypeAttributes(), true); 1224 1225 endAttrs(acountIdx, acount); 1226 } 1227 //where 1228 private boolean needsLocalVariableTypeEntry(Type t) { 1229 //a local variable needs a type-entry if its type T is generic 1230 //(i.e. |T| != T) and if it's not an intersection type (not supported 1231 //in signature attribute grammar) 1232 return (!types.isSameType(t, types.erasure(t)) && 1233 !t.isCompound()); 1234 } 1235 1236 void writeStackMap(Code code) { 1237 int nframes = code.stackMapBufferSize; 1238 if (debugstackmap) System.out.println(" nframes = " + nframes); 1239 databuf.appendChar(nframes); 1240 1241 switch (code.stackMap) { 1242 case CLDC: 1243 for (int i=0; i<nframes; i++) { 1244 if (debugstackmap) System.out.print(" " + i + ":"); 1245 Code.StackMapFrame frame = code.stackMapBuffer[i]; 1246 1247 // output PC 1248 if (debugstackmap) System.out.print(" pc=" + frame.pc); 1249 databuf.appendChar(frame.pc); 1250 1251 // output locals 1252 int localCount = 0; 1253 for (int j=0; j<frame.locals.length; 1254 j += Code.width(frame.locals[j])) { 1255 localCount++; 1256 } 1257 if (debugstackmap) System.out.print(" nlocals=" + 1258 localCount); 1259 databuf.appendChar(localCount); 1260 for (int j=0; j<frame.locals.length; 1261 j += Code.width(frame.locals[j])) { 1262 if (debugstackmap) System.out.print(" local[" + j + "]="); 1263 writeStackMapType(frame.locals[j]); 1264 } 1265 1266 // output stack 1267 int stackCount = 0; 1268 for (int j=0; j<frame.stack.length; 1269 j += Code.width(frame.stack[j])) { 1270 stackCount++; 1271 } 1272 if (debugstackmap) System.out.print(" nstack=" + 1273 stackCount); 1274 databuf.appendChar(stackCount); 1275 for (int j=0; j<frame.stack.length; 1276 j += Code.width(frame.stack[j])) { 1277 if (debugstackmap) System.out.print(" stack[" + j + "]="); 1278 writeStackMapType(frame.stack[j]); 1279 } 1280 if (debugstackmap) System.out.println(); 1281 } 1282 break; 1283 case JSR202: { 1284 Assert.checkNull(code.stackMapBuffer); 1285 for (int i=0; i<nframes; i++) { 1286 if (debugstackmap) System.out.print(" " + i + ":"); 1287 StackMapTableFrame frame = code.stackMapTableBuffer[i]; 1288 frame.write(this); 1289 if (debugstackmap) System.out.println(); 1290 } 1291 break; 1292 } 1293 default: 1294 throw new AssertionError("Unexpected stackmap format value"); 1295 } 1296 } 1297 1298 //where 1299 void writeStackMapType(Type t) { 1300 if (t == null) { 1301 if (debugstackmap) System.out.print("empty"); 1302 databuf.appendByte(0); 1303 } 1304 else switch(t.getTag()) { 1305 case BYTE: 1306 case CHAR: 1307 case SHORT: 1308 case INT: 1309 case BOOLEAN: 1310 if (debugstackmap) System.out.print("int"); 1311 databuf.appendByte(1); 1312 break; 1313 case FLOAT: 1314 if (debugstackmap) System.out.print("float"); 1315 databuf.appendByte(2); 1316 break; 1317 case DOUBLE: 1318 if (debugstackmap) System.out.print("double"); 1319 databuf.appendByte(3); 1320 break; 1321 case LONG: 1322 if (debugstackmap) System.out.print("long"); 1323 databuf.appendByte(4); 1324 break; 1325 case BOT: // null 1326 if (debugstackmap) System.out.print("null"); 1327 databuf.appendByte(5); 1328 break; 1329 case CLASS: 1330 case ARRAY: 1331 if (debugstackmap) System.out.print("object(" + t + ")"); 1332 databuf.appendByte(7); 1333 databuf.appendChar(pool.put(t)); 1334 break; 1335 case TYPEVAR: 1336 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")"); 1337 databuf.appendByte(7); 1338 databuf.appendChar(pool.put(types.erasure(t).tsym)); 1339 break; 1340 case UNINITIALIZED_THIS: 1341 if (debugstackmap) System.out.print("uninit_this"); 1342 databuf.appendByte(6); 1343 break; 1344 case UNINITIALIZED_OBJECT: 1345 { UninitializedType uninitType = (UninitializedType)t; 1346 databuf.appendByte(8); 1347 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset); 1348 databuf.appendChar(uninitType.offset); 1349 } 1350 break; 1351 default: 1352 throw new AssertionError(); 1353 } 1354 } 1355 1356 /** An entry in the JSR202 StackMapTable */ 1357 abstract static class StackMapTableFrame { 1358 abstract int getFrameType(); 1359 1360 void write(ClassWriter writer) { 1361 int frameType = getFrameType(); 1362 writer.databuf.appendByte(frameType); 1363 if (writer.debugstackmap) System.out.print(" frame_type=" + frameType); 1364 } 1365 1366 static class SameFrame extends StackMapTableFrame { 1367 final int offsetDelta; 1368 SameFrame(int offsetDelta) { 1369 this.offsetDelta = offsetDelta; 1370 } 1371 int getFrameType() { 1372 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED; 1373 } 1374 @Override 1375 void write(ClassWriter writer) { 1376 super.write(writer); 1377 if (getFrameType() == SAME_FRAME_EXTENDED) { 1378 writer.databuf.appendChar(offsetDelta); 1379 if (writer.debugstackmap){ 1380 System.out.print(" offset_delta=" + offsetDelta); 1381 } 1382 } 1383 } 1384 } 1385 1386 static class SameLocals1StackItemFrame extends StackMapTableFrame { 1387 final int offsetDelta; 1388 final Type stack; 1389 SameLocals1StackItemFrame(int offsetDelta, Type stack) { 1390 this.offsetDelta = offsetDelta; 1391 this.stack = stack; 1392 } 1393 int getFrameType() { 1394 return (offsetDelta < SAME_FRAME_SIZE) ? 1395 (SAME_FRAME_SIZE + offsetDelta) : 1396 SAME_LOCALS_1_STACK_ITEM_EXTENDED; 1397 } 1398 @Override 1399 void write(ClassWriter writer) { 1400 super.write(writer); 1401 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) { 1402 writer.databuf.appendChar(offsetDelta); 1403 if (writer.debugstackmap) { 1404 System.out.print(" offset_delta=" + offsetDelta); 1405 } 1406 } 1407 if (writer.debugstackmap) { 1408 System.out.print(" stack[" + 0 + "]="); 1409 } 1410 writer.writeStackMapType(stack); 1411 } 1412 } 1413 1414 static class ChopFrame extends StackMapTableFrame { 1415 final int frameType; 1416 final int offsetDelta; 1417 ChopFrame(int frameType, int offsetDelta) { 1418 this.frameType = frameType; 1419 this.offsetDelta = offsetDelta; 1420 } 1421 int getFrameType() { return frameType; } 1422 @Override 1423 void write(ClassWriter writer) { 1424 super.write(writer); 1425 writer.databuf.appendChar(offsetDelta); 1426 if (writer.debugstackmap) { 1427 System.out.print(" offset_delta=" + offsetDelta); 1428 } 1429 } 1430 } 1431 1432 static class AppendFrame extends StackMapTableFrame { 1433 final int frameType; 1434 final int offsetDelta; 1435 final Type[] locals; 1436 AppendFrame(int frameType, int offsetDelta, Type[] locals) { 1437 this.frameType = frameType; 1438 this.offsetDelta = offsetDelta; 1439 this.locals = locals; 1440 } 1441 int getFrameType() { return frameType; } 1442 @Override 1443 void write(ClassWriter writer) { 1444 super.write(writer); 1445 writer.databuf.appendChar(offsetDelta); 1446 if (writer.debugstackmap) { 1447 System.out.print(" offset_delta=" + offsetDelta); 1448 } 1449 for (int i=0; i<locals.length; i++) { 1450 if (writer.debugstackmap) System.out.print(" locals[" + i + "]="); 1451 writer.writeStackMapType(locals[i]); 1452 } 1453 } 1454 } 1455 1456 static class FullFrame extends StackMapTableFrame { 1457 final int offsetDelta; 1458 final Type[] locals; 1459 final Type[] stack; 1460 FullFrame(int offsetDelta, Type[] locals, Type[] stack) { 1461 this.offsetDelta = offsetDelta; 1462 this.locals = locals; 1463 this.stack = stack; 1464 } 1465 int getFrameType() { return FULL_FRAME; } 1466 @Override 1467 void write(ClassWriter writer) { 1468 super.write(writer); 1469 writer.databuf.appendChar(offsetDelta); 1470 writer.databuf.appendChar(locals.length); 1471 if (writer.debugstackmap) { 1472 System.out.print(" offset_delta=" + offsetDelta); 1473 System.out.print(" nlocals=" + locals.length); 1474 } 1475 for (int i=0; i<locals.length; i++) { 1476 if (writer.debugstackmap) System.out.print(" locals[" + i + "]="); 1477 writer.writeStackMapType(locals[i]); 1478 } 1479 1480 writer.databuf.appendChar(stack.length); 1481 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); } 1482 for (int i=0; i<stack.length; i++) { 1483 if (writer.debugstackmap) System.out.print(" stack[" + i + "]="); 1484 writer.writeStackMapType(stack[i]); 1485 } 1486 } 1487 } 1488 1489 /** Compare this frame with the previous frame and produce 1490 * an entry of compressed stack map frame. */ 1491 static StackMapTableFrame getInstance(Code.StackMapFrame this_frame, 1492 int prev_pc, 1493 Type[] prev_locals, 1494 Types types) { 1495 Type[] locals = this_frame.locals; 1496 Type[] stack = this_frame.stack; 1497 int offset_delta = this_frame.pc - prev_pc - 1; 1498 if (stack.length == 1) { 1499 if (locals.length == prev_locals.length 1500 && compare(prev_locals, locals, types) == 0) { 1501 return new SameLocals1StackItemFrame(offset_delta, stack[0]); 1502 } 1503 } else if (stack.length == 0) { 1504 int diff_length = compare(prev_locals, locals, types); 1505 if (diff_length == 0) { 1506 return new SameFrame(offset_delta); 1507 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) { 1508 // APPEND 1509 Type[] local_diff = new Type[-diff_length]; 1510 for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) { 1511 local_diff[j] = locals[i]; 1512 } 1513 return new AppendFrame(SAME_FRAME_EXTENDED - diff_length, 1514 offset_delta, 1515 local_diff); 1516 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) { 1517 // CHOP 1518 return new ChopFrame(SAME_FRAME_EXTENDED - diff_length, 1519 offset_delta); 1520 } 1521 } 1522 // FULL_FRAME 1523 return new FullFrame(offset_delta, locals, stack); 1524 } 1525 1526 static boolean isInt(Type t) { 1527 return (t.getTag().isStrictSubRangeOf(INT) || t.hasTag(BOOLEAN)); 1528 } 1529 1530 static boolean isSameType(Type t1, Type t2, Types types) { 1531 if (t1 == null) { return t2 == null; } 1532 if (t2 == null) { return false; } 1533 1534 if (isInt(t1) && isInt(t2)) { return true; } 1535 1536 if (t1.hasTag(UNINITIALIZED_THIS)) { 1537 return t2.hasTag(UNINITIALIZED_THIS); 1538 } else if (t1.hasTag(UNINITIALIZED_OBJECT)) { 1539 if (t2.hasTag(UNINITIALIZED_OBJECT)) { 1540 return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset; 1541 } else { 1542 return false; 1543 } 1544 } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) { 1545 return false; 1546 } 1547 1548 return types.isSameType(t1, t2); 1549 } 1550 1551 static int compare(Type[] arr1, Type[] arr2, Types types) { 1552 int diff_length = arr1.length - arr2.length; 1553 if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) { 1554 return Integer.MAX_VALUE; 1555 } 1556 int len = (diff_length > 0) ? arr2.length : arr1.length; 1557 for (int i=0; i<len; i++) { 1558 if (!isSameType(arr1[i], arr2[i], types)) { 1559 return Integer.MAX_VALUE; 1560 } 1561 } 1562 return diff_length; 1563 } 1564 } 1565 1566 void writeFields(Scope s) { 1567 // process them in reverse sibling order; 1568 // i.e., process them in declaration order. 1569 List<VarSymbol> vars = List.nil(); 1570 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) { 1571 if (sym.kind == VAR) vars = vars.prepend((VarSymbol)sym); 1572 } 1573 while (vars.nonEmpty()) { 1574 writeField(vars.head); 1575 vars = vars.tail; 1576 } 1577 } 1578 1579 void writeMethods(Scope s) { 1580 List<MethodSymbol> methods = List.nil(); 1581 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) { 1582 if (sym.kind == MTH && (sym.flags() & HYPOTHETICAL) == 0) 1583 methods = methods.prepend((MethodSymbol)sym); 1584 } 1585 while (methods.nonEmpty()) { 1586 writeMethod(methods.head); 1587 methods = methods.tail; 1588 } 1589 } 1590 1591 /** Emit a class file for a given class. 1592 * @param c The class from which a class file is generated. 1593 */ 1594 public JavaFileObject writeClass(ClassSymbol c) 1595 throws IOException, PoolOverflow, StringOverflow 1596 { 1597 JavaFileObject outFile 1598 = fileManager.getJavaFileForOutput(CLASS_OUTPUT, 1599 c.flatname.toString(), 1600 JavaFileObject.Kind.CLASS, 1601 c.sourcefile); 1602 OutputStream out = outFile.openOutputStream(); 1603 try { 1604 writeClassFile(out, c); 1605 if (verbose) 1606 log.printVerbose("wrote.file", outFile); 1607 out.close(); 1608 out = null; 1609 } finally { 1610 if (out != null) { 1611 // if we are propagating an exception, delete the file 1612 out.close(); 1613 outFile.delete(); 1614 outFile = null; 1615 } 1616 } 1617 return outFile; // may be null if write failed 1618 } 1619 1620 /** Write class `c' to outstream `out'. 1621 */ 1622 public void writeClassFile(OutputStream out, ClassSymbol c) 1623 throws IOException, PoolOverflow, StringOverflow { 1624 Assert.check((c.flags() & COMPOUND) == 0); 1625 databuf.reset(); 1626 poolbuf.reset(); 1627 signatureGen.reset(); 1628 pool = c.pool; 1629 innerClasses = null; 1630 innerClassesQueue = null; 1631 bootstrapMethods = new LinkedHashMap<>(); 1632 1633 Type supertype = types.supertype(c.type); 1634 List<Type> interfaces = types.interfaces(c.type); 1635 List<Type> typarams = c.type.getTypeArguments(); 1636 1637 int flags = adjustFlags(c.flags() & ~DEFAULT); 1638 if ((flags & PROTECTED) != 0) flags |= PUBLIC; 1639 flags = flags & ClassFlags & ~STRICTFP; 1640 if ((flags & INTERFACE) == 0) flags |= ACC_SUPER; 1641 if (c.isInner() && c.name.isEmpty()) flags &= ~FINAL; 1642 if (dumpClassModifiers) { 1643 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1644 pw.println(); 1645 pw.println("CLASSFILE " + c.getQualifiedName()); 1646 pw.println("---" + flagNames(flags)); 1647 } 1648 databuf.appendChar(flags); 1649 1650 databuf.appendChar(pool.put(c)); 1651 databuf.appendChar(supertype.hasTag(CLASS) ? pool.put(supertype.tsym) : 0); 1652 databuf.appendChar(interfaces.length()); 1653 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail) 1654 databuf.appendChar(pool.put(l.head.tsym)); 1655 int fieldsCount = 0; 1656 int methodsCount = 0; 1657 for (Symbol sym : c.members().getSymbols(NON_RECURSIVE)) { 1658 switch (sym.kind) { 1659 case VAR: fieldsCount++; break; 1660 case MTH: if ((sym.flags() & HYPOTHETICAL) == 0) methodsCount++; 1661 break; 1662 case TYP: enterInner((ClassSymbol)sym); break; 1663 default : Assert.error(); 1664 } 1665 } 1666 1667 if (c.trans_local != null) { 1668 for (ClassSymbol local : c.trans_local) { 1669 enterInner(local); 1670 } 1671 } 1672 1673 databuf.appendChar(fieldsCount); 1674 writeFields(c.members()); 1675 databuf.appendChar(methodsCount); 1676 writeMethods(c.members()); 1677 1678 int acountIdx = beginAttrs(); 1679 int acount = 0; 1680 1681 boolean sigReq = 1682 typarams.length() != 0 || supertype.allparams().length() != 0; 1683 for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail) 1684 sigReq = l.head.allparams().length() != 0; 1685 if (sigReq) { 1686 int alenIdx = writeAttr(names.Signature); 1687 if (typarams.length() != 0) signatureGen.assembleParamsSig(typarams); 1688 signatureGen.assembleSig(supertype); 1689 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail) 1690 signatureGen.assembleSig(l.head); 1691 databuf.appendChar(pool.put(signatureGen.toName())); 1692 signatureGen.reset(); 1693 endAttr(alenIdx); 1694 acount++; 1695 } 1696 1697 if (c.sourcefile != null && emitSourceFile) { 1698 int alenIdx = writeAttr(names.SourceFile); 1699 // WHM 6/29/1999: Strip file path prefix. We do it here at 1700 // the last possible moment because the sourcefile may be used 1701 // elsewhere in error diagnostics. Fixes 4241573. 1702 //databuf.appendChar(c.pool.put(c.sourcefile)); 1703 String simpleName = PathFileObject.getSimpleName(c.sourcefile); 1704 databuf.appendChar(c.pool.put(names.fromString(simpleName))); 1705 endAttr(alenIdx); 1706 acount++; 1707 } 1708 1709 if (genCrt) { 1710 // Append SourceID attribute 1711 int alenIdx = writeAttr(names.SourceID); 1712 databuf.appendChar(c.pool.put(names.fromString(Long.toString(getLastModified(c.sourcefile))))); 1713 endAttr(alenIdx); 1714 acount++; 1715 // Append CompilationID attribute 1716 alenIdx = writeAttr(names.CompilationID); 1717 databuf.appendChar(c.pool.put(names.fromString(Long.toString(System.currentTimeMillis())))); 1718 endAttr(alenIdx); 1719 acount++; 1720 } 1721 1722 acount += writeFlagAttrs(c.flags()); 1723 acount += writeJavaAnnotations(c.getRawAttributes()); 1724 acount += writeTypeAnnotations(c.getRawTypeAttributes(), false); 1725 acount += writeEnclosingMethodAttribute(c); 1726 acount += writeExtraClassAttributes(c); 1727 1728 poolbuf.appendInt(JAVA_MAGIC); 1729 poolbuf.appendChar(target.minorVersion); 1730 poolbuf.appendChar(target.majorVersion); 1731 1732 writePool(c.pool); 1733 1734 if (innerClasses != null) { 1735 writeInnerClasses(); 1736 acount++; 1737 } 1738 1739 if (!bootstrapMethods.isEmpty()) { 1740 writeBootstrapMethods(); 1741 acount++; 1742 } 1743 1744 endAttrs(acountIdx, acount); 1745 1746 poolbuf.appendBytes(databuf.elems, 0, databuf.length); 1747 out.write(poolbuf.elems, 0, poolbuf.length); 1748 1749 pool = c.pool = null; // to conserve space 1750 } 1751 1752 /**Allows subclasses to write additional class attributes 1753 * 1754 * @return the number of attributes written 1755 */ 1756 protected int writeExtraClassAttributes(ClassSymbol c) { 1757 return 0; 1758 } 1759 1760 int adjustFlags(final long flags) { 1761 int result = (int)flags; 1762 1763 if ((flags & BRIDGE) != 0) 1764 result |= ACC_BRIDGE; 1765 if ((flags & VARARGS) != 0) 1766 result |= ACC_VARARGS; 1767 if ((flags & DEFAULT) != 0) 1768 result &= ~ABSTRACT; 1769 return result; 1770 } 1771 1772 long getLastModified(FileObject filename) { 1773 long mod = 0; 1774 try { 1775 mod = filename.getLastModified(); 1776 } catch (SecurityException e) { 1777 throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage()); 1778 } 1779 return mod; 1780 } 1781} 1782