ClassWriter.java revision 3294:9adfb22ff08f
1/* 2 * Copyright (c) 1999, 2016, 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.JavaFileManager.Location; 37import javax.tools.JavaFileObject; 38 39import com.sun.tools.javac.code.*; 40import com.sun.tools.javac.code.Attribute.RetentionPolicy; 41import com.sun.tools.javac.code.Directive.*; 42import com.sun.tools.javac.code.Symbol.*; 43import com.sun.tools.javac.code.Type.*; 44import com.sun.tools.javac.code.Types.UniqueType; 45import com.sun.tools.javac.file.PathFileObject; 46import com.sun.tools.javac.jvm.Pool.DynamicMethod; 47import com.sun.tools.javac.jvm.Pool.Method; 48import com.sun.tools.javac.jvm.Pool.MethodHandle; 49import com.sun.tools.javac.jvm.Pool.Variable; 50import com.sun.tools.javac.util.*; 51 52import static com.sun.tools.javac.code.Flags.*; 53import static com.sun.tools.javac.code.Kinds.Kind.*; 54import static com.sun.tools.javac.code.Scope.LookupKind.NON_RECURSIVE; 55import static com.sun.tools.javac.code.TypeTag.*; 56import static com.sun.tools.javac.main.Option.*; 57 58import static javax.tools.StandardLocation.CLASS_OUTPUT; 59 60/** This class provides operations to map an internal symbol table graph 61 * rooted in a ClassSymbol into a classfile. 62 * 63 * <p><b>This is NOT part of any supported API. 64 * If you write code that depends on this, you do so at your own risk. 65 * This code and its internal interfaces are subject to change or 66 * deletion without notice.</b> 67 */ 68public class ClassWriter extends ClassFile { 69 protected static final Context.Key<ClassWriter> classWriterKey = new Context.Key<>(); 70 71 private final Options options; 72 73 /** Switch: verbose output. 74 */ 75 private boolean verbose; 76 77 /** Switch: emit source file attribute. 78 */ 79 private boolean emitSourceFile; 80 81 /** Switch: generate CharacterRangeTable attribute. 82 */ 83 private boolean genCrt; 84 85 /** Switch: describe the generated stackmap. 86 */ 87 boolean debugstackmap; 88 89 /** 90 * Target class version. 91 */ 92 private Target target; 93 94 /** 95 * Source language version. 96 */ 97 private Source source; 98 99 /** Type utilities. */ 100 private Types types; 101 102 /** 103 * If true, class files will be written in module-specific subdirectories 104 * of the CLASS_OUTPUT location. 105 */ 106 public boolean multiModuleMode; 107 108 /** The initial sizes of the data and constant pool buffers. 109 * Sizes are increased when buffers get full. 110 */ 111 static final int DATA_BUF_SIZE = 0x0fff0; 112 static final int POOL_BUF_SIZE = 0x1fff0; 113 114 /** An output buffer for member info. 115 */ 116 ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE); 117 118 /** An output buffer for the constant pool. 119 */ 120 ByteBuffer poolbuf = new ByteBuffer(POOL_BUF_SIZE); 121 122 /** The constant pool. 123 */ 124 Pool pool; 125 126 /** The inner classes to be written, as a set. 127 */ 128 Set<ClassSymbol> innerClasses; 129 130 /** The inner classes to be written, as a queue where 131 * enclosing classes come first. 132 */ 133 ListBuffer<ClassSymbol> innerClassesQueue; 134 135 /** The bootstrap methods to be written in the corresponding class attribute 136 * (one for each invokedynamic) 137 */ 138 Map<DynamicMethod.BootstrapMethodsKey, DynamicMethod.BootstrapMethodsValue> bootstrapMethods; 139 140 /** The log to use for verbose output. 141 */ 142 private final Log log; 143 144 /** The name table. */ 145 private final Names names; 146 147 /** Access to files. */ 148 private final JavaFileManager fileManager; 149 150 /** Sole signature generator */ 151 private final CWSignatureGenerator signatureGen; 152 153 /** The tags and constants used in compressed stackmap. */ 154 static final int SAME_FRAME_SIZE = 64; 155 static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247; 156 static final int SAME_FRAME_EXTENDED = 251; 157 static final int FULL_FRAME = 255; 158 static final int MAX_LOCAL_LENGTH_DIFF = 4; 159 160 /** Get the ClassWriter instance for this context. */ 161 public static ClassWriter instance(Context context) { 162 ClassWriter instance = context.get(classWriterKey); 163 if (instance == null) 164 instance = new ClassWriter(context); 165 return instance; 166 } 167 168 /** Construct a class writer, given an options table. 169 */ 170 protected ClassWriter(Context context) { 171 context.put(classWriterKey, this); 172 173 log = Log.instance(context); 174 names = Names.instance(context); 175 options = Options.instance(context); 176 target = Target.instance(context); 177 source = Source.instance(context); 178 types = Types.instance(context); 179 fileManager = context.get(JavaFileManager.class); 180 signatureGen = new CWSignatureGenerator(types); 181 182 verbose = options.isSet(VERBOSE); 183 genCrt = options.isSet(XJCOV); 184 debugstackmap = options.isSet("debugstackmap"); 185 186 emitSourceFile = options.isUnset(G_CUSTOM) || 187 options.isSet(G_CUSTOM, "source"); 188 189 String dumpModFlags = options.get("dumpmodifiers"); 190 dumpClassModifiers = 191 (dumpModFlags != null && dumpModFlags.indexOf('c') != -1); 192 dumpFieldModifiers = 193 (dumpModFlags != null && dumpModFlags.indexOf('f') != -1); 194 dumpInnerClassModifiers = 195 (dumpModFlags != null && dumpModFlags.indexOf('i') != -1); 196 dumpMethodModifiers = 197 (dumpModFlags != null && dumpModFlags.indexOf('m') != -1); 198 } 199 200/****************************************************************** 201 * Diagnostics: dump generated class names and modifiers 202 ******************************************************************/ 203 204 /** Value of option 'dumpmodifiers' is a string 205 * indicating which modifiers should be dumped for debugging: 206 * 'c' -- classes 207 * 'f' -- fields 208 * 'i' -- innerclass attributes 209 * 'm' -- methods 210 * For example, to dump everything: 211 * javac -XDdumpmodifiers=cifm MyProg.java 212 */ 213 private final boolean dumpClassModifiers; // -XDdumpmodifiers=c 214 private final boolean dumpFieldModifiers; // -XDdumpmodifiers=f 215 private final boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i 216 private final boolean dumpMethodModifiers; // -XDdumpmodifiers=m 217 218 219 /** Return flags as a string, separated by " ". 220 */ 221 public static String flagNames(long flags) { 222 StringBuilder sbuf = new StringBuilder(); 223 int i = 0; 224 long f = flags & StandardFlags; 225 while (f != 0) { 226 if ((f & 1) != 0) { 227 sbuf.append(" "); 228 sbuf.append(flagName[i]); 229 } 230 f = f >> 1; 231 i++; 232 } 233 return sbuf.toString(); 234 } 235 //where 236 private final static String[] flagName = { 237 "PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL", 238 "SUPER", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE", 239 "ABSTRACT", "STRICTFP"}; 240 241/****************************************************************** 242 * Output routines 243 ******************************************************************/ 244 245 /** Write a character into given byte buffer; 246 * byte buffer will not be grown. 247 */ 248 void putChar(ByteBuffer buf, int op, int x) { 249 buf.elems[op ] = (byte)((x >> 8) & 0xFF); 250 buf.elems[op+1] = (byte)((x ) & 0xFF); 251 } 252 253 /** Write an integer into given byte buffer; 254 * byte buffer will not be grown. 255 */ 256 void putInt(ByteBuffer buf, int adr, int x) { 257 buf.elems[adr ] = (byte)((x >> 24) & 0xFF); 258 buf.elems[adr+1] = (byte)((x >> 16) & 0xFF); 259 buf.elems[adr+2] = (byte)((x >> 8) & 0xFF); 260 buf.elems[adr+3] = (byte)((x ) & 0xFF); 261 } 262 263 /** 264 * Signature Generation 265 */ 266 private class CWSignatureGenerator extends Types.SignatureGenerator { 267 268 /** 269 * An output buffer for type signatures. 270 */ 271 ByteBuffer sigbuf = new ByteBuffer(); 272 273 CWSignatureGenerator(Types types) { 274 super(types); 275 } 276 277 /** 278 * Assemble signature of given type in string buffer. 279 * Check for uninitialized types before calling the general case. 280 */ 281 @Override 282 public void assembleSig(Type type) { 283 switch (type.getTag()) { 284 case UNINITIALIZED_THIS: 285 case UNINITIALIZED_OBJECT: 286 // we don't yet have a spec for uninitialized types in the 287 // local variable table 288 assembleSig(types.erasure(((UninitializedType)type).qtype)); 289 break; 290 default: 291 super.assembleSig(type); 292 } 293 } 294 295 @Override 296 protected void append(char ch) { 297 sigbuf.appendByte(ch); 298 } 299 300 @Override 301 protected void append(byte[] ba) { 302 sigbuf.appendBytes(ba); 303 } 304 305 @Override 306 protected void append(Name name) { 307 sigbuf.appendName(name); 308 } 309 310 @Override 311 protected void classReference(ClassSymbol c) { 312 enterInner(c); 313 } 314 315 private void reset() { 316 sigbuf.reset(); 317 } 318 319 private Name toName() { 320 return sigbuf.toName(names); 321 } 322 323 private boolean isEmpty() { 324 return sigbuf.length == 0; 325 } 326 } 327 328 /** 329 * Return signature of given type 330 */ 331 Name typeSig(Type type) { 332 Assert.check(signatureGen.isEmpty()); 333 //- System.out.println(" ? " + type); 334 signatureGen.assembleSig(type); 335 Name n = signatureGen.toName(); 336 signatureGen.reset(); 337 //- System.out.println(" " + n); 338 return n; 339 } 340 341 /** Given a type t, return the extended class name of its erasure in 342 * external representation. 343 */ 344 public Name xClassName(Type t) { 345 if (t.hasTag(CLASS)) { 346 return names.fromUtf(externalize(t.tsym.flatName())); 347 } else if (t.hasTag(ARRAY)) { 348 return typeSig(types.erasure(t)); 349 } else { 350 throw new AssertionError("xClassName expects class or array type, got " + t); 351 } 352 } 353 354/****************************************************************** 355 * Writing the Constant Pool 356 ******************************************************************/ 357 358 /** Thrown when the constant pool is over full. 359 */ 360 public static class PoolOverflow extends Exception { 361 private static final long serialVersionUID = 0; 362 public PoolOverflow() {} 363 } 364 public static class StringOverflow extends Exception { 365 private static final long serialVersionUID = 0; 366 public final String value; 367 public StringOverflow(String s) { 368 value = s; 369 } 370 } 371 372 /** Write constant pool to pool buffer. 373 * Note: during writing, constant pool 374 * might grow since some parts of constants still need to be entered. 375 */ 376 void writePool(Pool pool) throws PoolOverflow, StringOverflow { 377 int poolCountIdx = poolbuf.length; 378 poolbuf.appendChar(0); 379 int i = 1; 380 while (i < pool.pp) { 381 Object value = pool.pool[i]; 382 Assert.checkNonNull(value); 383 if (value instanceof Method || value instanceof Variable) 384 value = ((DelegatedSymbol)value).getUnderlyingSymbol(); 385 386 if (value instanceof MethodSymbol) { 387 MethodSymbol m = (MethodSymbol)value; 388 if (!m.isDynamic()) { 389 poolbuf.appendByte((m.owner.flags() & INTERFACE) != 0 390 ? CONSTANT_InterfaceMethodref 391 : CONSTANT_Methodref); 392 poolbuf.appendChar(pool.put(m.owner)); 393 poolbuf.appendChar(pool.put(nameType(m))); 394 } else { 395 //invokedynamic 396 DynamicMethodSymbol dynSym = (DynamicMethodSymbol)m; 397 MethodHandle handle = new MethodHandle(dynSym.bsmKind, dynSym.bsm, types); 398 DynamicMethod.BootstrapMethodsKey key = new DynamicMethod.BootstrapMethodsKey(dynSym, types); 399 400 // Figure out the index for existing BSM; create a new BSM if no key 401 DynamicMethod.BootstrapMethodsValue val = bootstrapMethods.get(key); 402 if (val == null) { 403 int index = bootstrapMethods.size(); 404 val = new DynamicMethod.BootstrapMethodsValue(handle, index); 405 bootstrapMethods.put(key, val); 406 } 407 408 //init cp entries 409 pool.put(names.BootstrapMethods); 410 pool.put(handle); 411 for (Object staticArg : dynSym.staticArgs) { 412 pool.put(staticArg); 413 } 414 poolbuf.appendByte(CONSTANT_InvokeDynamic); 415 poolbuf.appendChar(val.index); 416 poolbuf.appendChar(pool.put(nameType(dynSym))); 417 } 418 } else if (value instanceof VarSymbol) { 419 VarSymbol v = (VarSymbol)value; 420 poolbuf.appendByte(CONSTANT_Fieldref); 421 poolbuf.appendChar(pool.put(v.owner)); 422 poolbuf.appendChar(pool.put(nameType(v))); 423 } else if (value instanceof Name) { 424 poolbuf.appendByte(CONSTANT_Utf8); 425 byte[] bs = ((Name)value).toUtf(); 426 poolbuf.appendChar(bs.length); 427 poolbuf.appendBytes(bs, 0, bs.length); 428 if (bs.length > Pool.MAX_STRING_LENGTH) 429 throw new StringOverflow(value.toString()); 430 } else if (value instanceof ClassSymbol) { 431 ClassSymbol c = (ClassSymbol)value; 432 if (c.owner.kind == TYP) pool.put(c.owner); 433 poolbuf.appendByte(CONSTANT_Class); 434 if (c.type.hasTag(ARRAY)) { 435 poolbuf.appendChar(pool.put(typeSig(c.type))); 436 } else { 437 poolbuf.appendChar(pool.put(names.fromUtf(externalize(c.flatname)))); 438 enterInner(c); 439 } 440 } else if (value instanceof NameAndType) { 441 NameAndType nt = (NameAndType)value; 442 poolbuf.appendByte(CONSTANT_NameandType); 443 poolbuf.appendChar(pool.put(nt.name)); 444 poolbuf.appendChar(pool.put(typeSig(nt.uniqueType.type))); 445 } else if (value instanceof Integer) { 446 poolbuf.appendByte(CONSTANT_Integer); 447 poolbuf.appendInt(((Integer)value).intValue()); 448 } else if (value instanceof Long) { 449 poolbuf.appendByte(CONSTANT_Long); 450 poolbuf.appendLong(((Long)value).longValue()); 451 i++; 452 } else if (value instanceof Float) { 453 poolbuf.appendByte(CONSTANT_Float); 454 poolbuf.appendFloat(((Float)value).floatValue()); 455 } else if (value instanceof Double) { 456 poolbuf.appendByte(CONSTANT_Double); 457 poolbuf.appendDouble(((Double)value).doubleValue()); 458 i++; 459 } else if (value instanceof String) { 460 poolbuf.appendByte(CONSTANT_String); 461 poolbuf.appendChar(pool.put(names.fromString((String)value))); 462 } else if (value instanceof UniqueType) { 463 Type type = ((UniqueType)value).type; 464 if (type.hasTag(METHOD)) { 465 poolbuf.appendByte(CONSTANT_MethodType); 466 poolbuf.appendChar(pool.put(typeSig((MethodType)type))); 467 } else { 468 Assert.check(type.hasTag(ARRAY)); 469 poolbuf.appendByte(CONSTANT_Class); 470 poolbuf.appendChar(pool.put(xClassName(type))); 471 } 472 } else if (value instanceof MethodHandle) { 473 MethodHandle ref = (MethodHandle)value; 474 poolbuf.appendByte(CONSTANT_MethodHandle); 475 poolbuf.appendByte(ref.refKind); 476 poolbuf.appendChar(pool.put(ref.refSym)); 477 } else { 478 Assert.error("writePool " + value); 479 } 480 i++; 481 } 482 if (pool.pp > Pool.MAX_ENTRIES) 483 throw new PoolOverflow(); 484 putChar(poolbuf, poolCountIdx, pool.pp); 485 } 486 487 /** Given a symbol, return its name-and-type. 488 */ 489 NameAndType nameType(Symbol sym) { 490 return new NameAndType(sym.name, sym.externalType(types), types); 491 // the NameAndType is generated from a symbol reference, and the 492 // adjustment of adding an additional this$n parameter needs to be made. 493 } 494 495/****************************************************************** 496 * Writing Attributes 497 ******************************************************************/ 498 499 /** Write header for an attribute to data buffer and return 500 * position past attribute length index. 501 */ 502 int writeAttr(Name attrName) { 503 databuf.appendChar(pool.put(attrName)); 504 databuf.appendInt(0); 505 return databuf.length; 506 } 507 508 /** Fill in attribute length. 509 */ 510 void endAttr(int index) { 511 putInt(databuf, index - 4, databuf.length - index); 512 } 513 514 /** Leave space for attribute count and return index for 515 * number of attributes field. 516 */ 517 int beginAttrs() { 518 databuf.appendChar(0); 519 return databuf.length; 520 } 521 522 /** Fill in number of attributes. 523 */ 524 void endAttrs(int index, int count) { 525 putChar(databuf, index - 2, count); 526 } 527 528 /** Write the EnclosingMethod attribute if needed. 529 * Returns the number of attributes written (0 or 1). 530 */ 531 int writeEnclosingMethodAttribute(ClassSymbol c) { 532 return writeEnclosingMethodAttribute(names.EnclosingMethod, c); 533 } 534 535 /** Write the EnclosingMethod attribute with a specified name. 536 * Returns the number of attributes written (0 or 1). 537 */ 538 protected int writeEnclosingMethodAttribute(Name attributeName, ClassSymbol c) { 539 if (c.owner.kind != MTH && // neither a local class 540 c.name != names.empty) // nor anonymous 541 return 0; 542 543 int alenIdx = writeAttr(attributeName); 544 ClassSymbol enclClass = c.owner.enclClass(); 545 MethodSymbol enclMethod = 546 (c.owner.type == null // local to init block 547 || c.owner.kind != MTH) // or member init 548 ? null 549 : (MethodSymbol)c.owner; 550 databuf.appendChar(pool.put(enclClass)); 551 databuf.appendChar(enclMethod == null ? 0 : pool.put(nameType(c.owner))); 552 endAttr(alenIdx); 553 return 1; 554 } 555 556 /** Write flag attributes; return number of attributes written. 557 */ 558 int writeFlagAttrs(long flags) { 559 int acount = 0; 560 if ((flags & DEPRECATED) != 0) { 561 int alenIdx = writeAttr(names.Deprecated); 562 endAttr(alenIdx); 563 acount++; 564 } 565 return acount; 566 } 567 568 /** Write member (field or method) attributes; 569 * return number of attributes written. 570 */ 571 int writeMemberAttrs(Symbol sym) { 572 int acount = writeFlagAttrs(sym.flags()); 573 long flags = sym.flags(); 574 if ((flags & (SYNTHETIC | BRIDGE)) != SYNTHETIC && 575 (flags & ANONCONSTR) == 0 && 576 (!types.isSameType(sym.type, sym.erasure(types)) || 577 signatureGen.hasTypeVar(sym.type.getThrownTypes()))) { 578 // note that a local class with captured variables 579 // will get a signature attribute 580 int alenIdx = writeAttr(names.Signature); 581 databuf.appendChar(pool.put(typeSig(sym.type))); 582 endAttr(alenIdx); 583 acount++; 584 } 585 acount += writeJavaAnnotations(sym.getRawAttributes()); 586 acount += writeTypeAnnotations(sym.getRawTypeAttributes(), false); 587 return acount; 588 } 589 590 /** 591 * Write method parameter names attribute. 592 */ 593 int writeMethodParametersAttr(MethodSymbol m) { 594 MethodType ty = m.externalType(types).asMethodType(); 595 final int allparams = ty.argtypes.size(); 596 if (m.params != null && allparams != 0) { 597 final int attrIndex = writeAttr(names.MethodParameters); 598 databuf.appendByte(allparams); 599 // Write extra parameters first 600 for (VarSymbol s : m.extraParams) { 601 final int flags = 602 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) | 603 ((int) m.flags() & SYNTHETIC); 604 databuf.appendChar(pool.put(s.name)); 605 databuf.appendChar(flags); 606 } 607 // Now write the real parameters 608 for (VarSymbol s : m.params) { 609 final int flags = 610 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) | 611 ((int) m.flags() & SYNTHETIC); 612 databuf.appendChar(pool.put(s.name)); 613 databuf.appendChar(flags); 614 } 615 // Now write the captured locals 616 for (VarSymbol s : m.capturedLocals) { 617 final int flags = 618 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) | 619 ((int) m.flags() & SYNTHETIC); 620 databuf.appendChar(pool.put(s.name)); 621 databuf.appendChar(flags); 622 } 623 endAttr(attrIndex); 624 return 1; 625 } else 626 return 0; 627 } 628 629 630 private void writeParamAnnotations(List<VarSymbol> params, 631 RetentionPolicy retention) { 632 for (VarSymbol s : params) { 633 ListBuffer<Attribute.Compound> buf = new ListBuffer<>(); 634 for (Attribute.Compound a : s.getRawAttributes()) 635 if (types.getRetention(a) == retention) 636 buf.append(a); 637 databuf.appendChar(buf.length()); 638 for (Attribute.Compound a : buf) 639 writeCompoundAttribute(a); 640 } 641 642 } 643 644 private void writeParamAnnotations(MethodSymbol m, 645 RetentionPolicy retention) { 646 databuf.appendByte(m.params.length()); 647 writeParamAnnotations(m.params, retention); 648 } 649 650 /** Write method parameter annotations; 651 * return number of attributes written. 652 */ 653 int writeParameterAttrs(MethodSymbol m) { 654 boolean hasVisible = false; 655 boolean hasInvisible = false; 656 if (m.params != null) { 657 for (VarSymbol s : m.params) { 658 for (Attribute.Compound a : s.getRawAttributes()) { 659 switch (types.getRetention(a)) { 660 case SOURCE: break; 661 case CLASS: hasInvisible = true; break; 662 case RUNTIME: hasVisible = true; break; 663 default: // /* fail soft */ throw new AssertionError(vis); 664 } 665 } 666 } 667 } 668 669 int attrCount = 0; 670 if (hasVisible) { 671 int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations); 672 writeParamAnnotations(m, RetentionPolicy.RUNTIME); 673 endAttr(attrIndex); 674 attrCount++; 675 } 676 if (hasInvisible) { 677 int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations); 678 writeParamAnnotations(m, RetentionPolicy.CLASS); 679 endAttr(attrIndex); 680 attrCount++; 681 } 682 return attrCount; 683 } 684 685/********************************************************************** 686 * Writing Java-language annotations (aka metadata, attributes) 687 **********************************************************************/ 688 689 /** Write Java-language annotations; return number of JVM 690 * attributes written (zero or one). 691 */ 692 int writeJavaAnnotations(List<Attribute.Compound> attrs) { 693 if (attrs.isEmpty()) return 0; 694 ListBuffer<Attribute.Compound> visibles = new ListBuffer<>(); 695 ListBuffer<Attribute.Compound> invisibles = new ListBuffer<>(); 696 for (Attribute.Compound a : attrs) { 697 switch (types.getRetention(a)) { 698 case SOURCE: break; 699 case CLASS: invisibles.append(a); break; 700 case RUNTIME: visibles.append(a); break; 701 default: // /* fail soft */ throw new AssertionError(vis); 702 } 703 } 704 705 int attrCount = 0; 706 if (visibles.length() != 0) { 707 int attrIndex = writeAttr(names.RuntimeVisibleAnnotations); 708 databuf.appendChar(visibles.length()); 709 for (Attribute.Compound a : visibles) 710 writeCompoundAttribute(a); 711 endAttr(attrIndex); 712 attrCount++; 713 } 714 if (invisibles.length() != 0) { 715 int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations); 716 databuf.appendChar(invisibles.length()); 717 for (Attribute.Compound a : invisibles) 718 writeCompoundAttribute(a); 719 endAttr(attrIndex); 720 attrCount++; 721 } 722 return attrCount; 723 } 724 725 int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos, boolean inCode) { 726 if (typeAnnos.isEmpty()) return 0; 727 728 ListBuffer<Attribute.TypeCompound> visibles = new ListBuffer<>(); 729 ListBuffer<Attribute.TypeCompound> invisibles = new ListBuffer<>(); 730 731 for (Attribute.TypeCompound tc : typeAnnos) { 732 if (tc.hasUnknownPosition()) { 733 boolean fixed = tc.tryFixPosition(); 734 735 // Could we fix it? 736 if (!fixed) { 737 // This happens for nested types like @A Outer. @B Inner. 738 // For method parameters we get the annotation twice! Once with 739 // a valid position, once unknown. 740 // TODO: find a cleaner solution. 741 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 742 pw.println("ClassWriter: Position UNKNOWN in type annotation: " + tc); 743 continue; 744 } 745 } 746 747 if (tc.position.type.isLocal() != inCode) 748 continue; 749 if (!tc.position.emitToClassfile()) 750 continue; 751 switch (types.getRetention(tc)) { 752 case SOURCE: break; 753 case CLASS: invisibles.append(tc); break; 754 case RUNTIME: visibles.append(tc); break; 755 default: // /* fail soft */ throw new AssertionError(vis); 756 } 757 } 758 759 int attrCount = 0; 760 if (visibles.length() != 0) { 761 int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations); 762 databuf.appendChar(visibles.length()); 763 for (Attribute.TypeCompound p : visibles) 764 writeTypeAnnotation(p); 765 endAttr(attrIndex); 766 attrCount++; 767 } 768 769 if (invisibles.length() != 0) { 770 int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations); 771 databuf.appendChar(invisibles.length()); 772 for (Attribute.TypeCompound p : invisibles) 773 writeTypeAnnotation(p); 774 endAttr(attrIndex); 775 attrCount++; 776 } 777 778 return attrCount; 779 } 780 781 /** A visitor to write an attribute including its leading 782 * single-character marker. 783 */ 784 class AttributeWriter implements Attribute.Visitor { 785 public void visitConstant(Attribute.Constant _value) { 786 Object value = _value.value; 787 switch (_value.type.getTag()) { 788 case BYTE: 789 databuf.appendByte('B'); 790 break; 791 case CHAR: 792 databuf.appendByte('C'); 793 break; 794 case SHORT: 795 databuf.appendByte('S'); 796 break; 797 case INT: 798 databuf.appendByte('I'); 799 break; 800 case LONG: 801 databuf.appendByte('J'); 802 break; 803 case FLOAT: 804 databuf.appendByte('F'); 805 break; 806 case DOUBLE: 807 databuf.appendByte('D'); 808 break; 809 case BOOLEAN: 810 databuf.appendByte('Z'); 811 break; 812 case CLASS: 813 Assert.check(value instanceof String); 814 databuf.appendByte('s'); 815 value = names.fromString(value.toString()); // CONSTANT_Utf8 816 break; 817 default: 818 throw new AssertionError(_value.type); 819 } 820 databuf.appendChar(pool.put(value)); 821 } 822 public void visitEnum(Attribute.Enum e) { 823 databuf.appendByte('e'); 824 databuf.appendChar(pool.put(typeSig(e.value.type))); 825 databuf.appendChar(pool.put(e.value.name)); 826 } 827 public void visitClass(Attribute.Class clazz) { 828 databuf.appendByte('c'); 829 databuf.appendChar(pool.put(typeSig(clazz.classType))); 830 } 831 public void visitCompound(Attribute.Compound compound) { 832 databuf.appendByte('@'); 833 writeCompoundAttribute(compound); 834 } 835 public void visitError(Attribute.Error x) { 836 throw new AssertionError(x); 837 } 838 public void visitArray(Attribute.Array array) { 839 databuf.appendByte('['); 840 databuf.appendChar(array.values.length); 841 for (Attribute a : array.values) { 842 a.accept(this); 843 } 844 } 845 } 846 AttributeWriter awriter = new AttributeWriter(); 847 848 /** Write a compound attribute excluding the '@' marker. */ 849 void writeCompoundAttribute(Attribute.Compound c) { 850 databuf.appendChar(pool.put(typeSig(c.type))); 851 databuf.appendChar(c.values.length()); 852 for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) { 853 databuf.appendChar(pool.put(p.fst.name)); 854 p.snd.accept(awriter); 855 } 856 } 857 858 void writeTypeAnnotation(Attribute.TypeCompound c) { 859 writePosition(c.position); 860 writeCompoundAttribute(c); 861 } 862 863 void writePosition(TypeAnnotationPosition p) { 864 databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte 865 switch (p.type) { 866 // instanceof 867 case INSTANCEOF: 868 // new expression 869 case NEW: 870 // constructor/method reference receiver 871 case CONSTRUCTOR_REFERENCE: 872 case METHOD_REFERENCE: 873 databuf.appendChar(p.offset); 874 break; 875 // local variable 876 case LOCAL_VARIABLE: 877 // resource variable 878 case RESOURCE_VARIABLE: 879 databuf.appendChar(p.lvarOffset.length); // for table length 880 for (int i = 0; i < p.lvarOffset.length; ++i) { 881 databuf.appendChar(p.lvarOffset[i]); 882 databuf.appendChar(p.lvarLength[i]); 883 databuf.appendChar(p.lvarIndex[i]); 884 } 885 break; 886 // exception parameter 887 case EXCEPTION_PARAMETER: 888 databuf.appendChar(p.getExceptionIndex()); 889 break; 890 // method receiver 891 case METHOD_RECEIVER: 892 // Do nothing 893 break; 894 // type parameter 895 case CLASS_TYPE_PARAMETER: 896 case METHOD_TYPE_PARAMETER: 897 databuf.appendByte(p.parameter_index); 898 break; 899 // type parameter bound 900 case CLASS_TYPE_PARAMETER_BOUND: 901 case METHOD_TYPE_PARAMETER_BOUND: 902 databuf.appendByte(p.parameter_index); 903 databuf.appendByte(p.bound_index); 904 break; 905 // class extends or implements clause 906 case CLASS_EXTENDS: 907 databuf.appendChar(p.type_index); 908 break; 909 // throws 910 case THROWS: 911 databuf.appendChar(p.type_index); 912 break; 913 // method parameter 914 case METHOD_FORMAL_PARAMETER: 915 databuf.appendByte(p.parameter_index); 916 break; 917 // type cast 918 case CAST: 919 // method/constructor/reference type argument 920 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT: 921 case METHOD_INVOCATION_TYPE_ARGUMENT: 922 case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT: 923 case METHOD_REFERENCE_TYPE_ARGUMENT: 924 databuf.appendChar(p.offset); 925 databuf.appendByte(p.type_index); 926 break; 927 // We don't need to worry about these 928 case METHOD_RETURN: 929 case FIELD: 930 break; 931 case UNKNOWN: 932 throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!"); 933 default: 934 throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p); 935 } 936 937 { // Append location data for generics/arrays. 938 databuf.appendByte(p.location.size()); 939 java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location); 940 for (int i : loc) 941 databuf.appendByte((byte)i); 942 } 943 } 944 945/********************************************************************** 946 * Writing module attributes 947 **********************************************************************/ 948 949 /** Write the Module attribute if needed. 950 * Returns the number of attributes written (0 or 1). 951 */ 952 int writeModuleAttribute(ClassSymbol c) { 953 ModuleSymbol m = (ModuleSymbol) c.owner; 954 955 int alenIdx = writeAttr(names.Module); 956 ListBuffer<RequiresDirective> requires = new ListBuffer<>(); 957 for (RequiresDirective r: m.requires) { 958 if (!r.flags.contains(RequiresFlag.EXTRA)) 959 requires.add(r); 960 } 961 databuf.appendChar(requires.size()); 962 for (RequiresDirective r: requires) { 963 databuf.appendChar(pool.put(r.module.name)); 964 databuf.appendChar(RequiresFlag.value(r.flags)); 965 } 966 967 List<ExportsDirective> exports = m.exports; 968 databuf.appendChar(exports.size()); 969 for (ExportsDirective e: exports) { 970 databuf.appendChar(pool.put(names.fromUtf(externalize(e.packge.flatName())))); 971 if (e.modules == null) { 972 databuf.appendChar(0); 973 } else { 974 databuf.appendChar(e.modules.size()); 975 for (ModuleSymbol msym: e.modules) 976 databuf.appendChar(pool.put(msym.name)); 977 } 978 } 979 980 List<UsesDirective> uses = m.uses; 981 databuf.appendChar(uses.size()); 982 for (UsesDirective s: uses) { 983 databuf.appendChar(pool.put(s.service)); 984 } 985 986 List<ProvidesDirective> services = m.provides; 987 databuf.appendChar(services.size()); 988 for (ProvidesDirective s: services) { 989 databuf.appendChar(pool.put(s.service)); 990 databuf.appendChar(pool.put(s.impl)); 991 } 992 993 endAttr(alenIdx); 994 return 1; 995 } 996 997/********************************************************************** 998 * Writing Objects 999 **********************************************************************/ 1000 1001 /** Enter an inner class into the `innerClasses' set/queue. 1002 */ 1003 void enterInner(ClassSymbol c) { 1004 if (c.type.isCompound()) { 1005 throw new AssertionError("Unexpected intersection type: " + c.type); 1006 } 1007 try { 1008 c.complete(); 1009 } catch (CompletionFailure ex) { 1010 System.err.println("error: " + c + ": " + ex.getMessage()); 1011 throw ex; 1012 } 1013 if (!c.type.hasTag(CLASS)) return; // arrays 1014 if (pool != null && // pool might be null if called from xClassName 1015 c.owner.enclClass() != null && 1016 (innerClasses == null || !innerClasses.contains(c))) { 1017// log.errWriter.println("enter inner " + c);//DEBUG 1018 enterInner(c.owner.enclClass()); 1019 pool.put(c); 1020 if (c.name != names.empty) 1021 pool.put(c.name); 1022 if (innerClasses == null) { 1023 innerClasses = new HashSet<>(); 1024 innerClassesQueue = new ListBuffer<>(); 1025 pool.put(names.InnerClasses); 1026 } 1027 innerClasses.add(c); 1028 innerClassesQueue.append(c); 1029 } 1030 } 1031 1032 /** Write "inner classes" attribute. 1033 */ 1034 void writeInnerClasses() { 1035 int alenIdx = writeAttr(names.InnerClasses); 1036 databuf.appendChar(innerClassesQueue.length()); 1037 for (List<ClassSymbol> l = innerClassesQueue.toList(); 1038 l.nonEmpty(); 1039 l = l.tail) { 1040 ClassSymbol inner = l.head; 1041 inner.markAbstractIfNeeded(types); 1042 char flags = (char) adjustFlags(inner.flags_field); 1043 if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT 1044 if (inner.name.isEmpty()) flags &= ~FINAL; // Anonymous class: unset FINAL flag 1045 flags &= ~STRICTFP; //inner classes should not have the strictfp flag set. 1046 if (dumpInnerClassModifiers) { 1047 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1048 pw.println("INNERCLASS " + inner.name); 1049 pw.println("---" + flagNames(flags)); 1050 } 1051 databuf.appendChar(pool.get(inner)); 1052 databuf.appendChar( 1053 inner.owner.kind == TYP && !inner.name.isEmpty() ? pool.get(inner.owner) : 0); 1054 databuf.appendChar( 1055 !inner.name.isEmpty() ? pool.get(inner.name) : 0); 1056 databuf.appendChar(flags); 1057 } 1058 endAttr(alenIdx); 1059 } 1060 1061 /** Write "bootstrapMethods" attribute. 1062 */ 1063 void writeBootstrapMethods() { 1064 int alenIdx = writeAttr(names.BootstrapMethods); 1065 databuf.appendChar(bootstrapMethods.size()); 1066 for (Map.Entry<DynamicMethod.BootstrapMethodsKey, DynamicMethod.BootstrapMethodsValue> entry : bootstrapMethods.entrySet()) { 1067 DynamicMethod.BootstrapMethodsKey bsmKey = entry.getKey(); 1068 //write BSM handle 1069 databuf.appendChar(pool.get(entry.getValue().mh)); 1070 Object[] uniqueArgs = bsmKey.getUniqueArgs(); 1071 //write static args length 1072 databuf.appendChar(uniqueArgs.length); 1073 //write static args array 1074 for (Object o : uniqueArgs) { 1075 databuf.appendChar(pool.get(o)); 1076 } 1077 } 1078 endAttr(alenIdx); 1079 } 1080 1081 /** Write field symbol, entering all references into constant pool. 1082 */ 1083 void writeField(VarSymbol v) { 1084 int flags = adjustFlags(v.flags()); 1085 databuf.appendChar(flags); 1086 if (dumpFieldModifiers) { 1087 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1088 pw.println("FIELD " + v.name); 1089 pw.println("---" + flagNames(v.flags())); 1090 } 1091 databuf.appendChar(pool.put(v.name)); 1092 databuf.appendChar(pool.put(typeSig(v.erasure(types)))); 1093 int acountIdx = beginAttrs(); 1094 int acount = 0; 1095 if (v.getConstValue() != null) { 1096 int alenIdx = writeAttr(names.ConstantValue); 1097 databuf.appendChar(pool.put(v.getConstValue())); 1098 endAttr(alenIdx); 1099 acount++; 1100 } 1101 acount += writeMemberAttrs(v); 1102 endAttrs(acountIdx, acount); 1103 } 1104 1105 /** Write method symbol, entering all references into constant pool. 1106 */ 1107 void writeMethod(MethodSymbol m) { 1108 int flags = adjustFlags(m.flags()); 1109 databuf.appendChar(flags); 1110 if (dumpMethodModifiers) { 1111 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1112 pw.println("METHOD " + m.name); 1113 pw.println("---" + flagNames(m.flags())); 1114 } 1115 databuf.appendChar(pool.put(m.name)); 1116 databuf.appendChar(pool.put(typeSig(m.externalType(types)))); 1117 int acountIdx = beginAttrs(); 1118 int acount = 0; 1119 if (m.code != null) { 1120 int alenIdx = writeAttr(names.Code); 1121 writeCode(m.code); 1122 m.code = null; // to conserve space 1123 endAttr(alenIdx); 1124 acount++; 1125 } 1126 List<Type> thrown = m.erasure(types).getThrownTypes(); 1127 if (thrown.nonEmpty()) { 1128 int alenIdx = writeAttr(names.Exceptions); 1129 databuf.appendChar(thrown.length()); 1130 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail) 1131 databuf.appendChar(pool.put(l.head.tsym)); 1132 endAttr(alenIdx); 1133 acount++; 1134 } 1135 if (m.defaultValue != null) { 1136 int alenIdx = writeAttr(names.AnnotationDefault); 1137 m.defaultValue.accept(awriter); 1138 endAttr(alenIdx); 1139 acount++; 1140 } 1141 if (options.isSet(PARAMETERS)) { 1142 if (!m.isLambdaMethod()) // Per JDK-8138729, do not emit parameters table for lambda bodies. 1143 acount += writeMethodParametersAttr(m); 1144 } 1145 acount += writeMemberAttrs(m); 1146 if (!m.isLambdaMethod()) 1147 acount += writeParameterAttrs(m); 1148 endAttrs(acountIdx, acount); 1149 } 1150 1151 /** Write code attribute of method. 1152 */ 1153 void writeCode(Code code) { 1154 databuf.appendChar(code.max_stack); 1155 databuf.appendChar(code.max_locals); 1156 databuf.appendInt(code.cp); 1157 databuf.appendBytes(code.code, 0, code.cp); 1158 databuf.appendChar(code.catchInfo.length()); 1159 for (List<char[]> l = code.catchInfo.toList(); 1160 l.nonEmpty(); 1161 l = l.tail) { 1162 for (int i = 0; i < l.head.length; i++) 1163 databuf.appendChar(l.head[i]); 1164 } 1165 int acountIdx = beginAttrs(); 1166 int acount = 0; 1167 1168 if (code.lineInfo.nonEmpty()) { 1169 int alenIdx = writeAttr(names.LineNumberTable); 1170 databuf.appendChar(code.lineInfo.length()); 1171 for (List<char[]> l = code.lineInfo.reverse(); 1172 l.nonEmpty(); 1173 l = l.tail) 1174 for (int i = 0; i < l.head.length; i++) 1175 databuf.appendChar(l.head[i]); 1176 endAttr(alenIdx); 1177 acount++; 1178 } 1179 1180 if (genCrt && (code.crt != null)) { 1181 CRTable crt = code.crt; 1182 int alenIdx = writeAttr(names.CharacterRangeTable); 1183 int crtIdx = beginAttrs(); 1184 int crtEntries = crt.writeCRT(databuf, code.lineMap, log); 1185 endAttrs(crtIdx, crtEntries); 1186 endAttr(alenIdx); 1187 acount++; 1188 } 1189 1190 // counter for number of generic local variables 1191 if (code.varDebugInfo && code.varBufferSize > 0) { 1192 int nGenericVars = 0; 1193 int alenIdx = writeAttr(names.LocalVariableTable); 1194 databuf.appendChar(code.getLVTSize()); 1195 for (int i=0; i<code.varBufferSize; i++) { 1196 Code.LocalVar var = code.varBuffer[i]; 1197 1198 for (Code.LocalVar.Range r: var.aliveRanges) { 1199 // write variable info 1200 Assert.check(r.start_pc >= 0 1201 && r.start_pc <= code.cp); 1202 databuf.appendChar(r.start_pc); 1203 Assert.check(r.length > 0 1204 && (r.start_pc + r.length) <= code.cp); 1205 databuf.appendChar(r.length); 1206 VarSymbol sym = var.sym; 1207 databuf.appendChar(pool.put(sym.name)); 1208 Type vartype = sym.erasure(types); 1209 databuf.appendChar(pool.put(typeSig(vartype))); 1210 databuf.appendChar(var.reg); 1211 if (needsLocalVariableTypeEntry(var.sym.type)) { 1212 nGenericVars++; 1213 } 1214 } 1215 } 1216 endAttr(alenIdx); 1217 acount++; 1218 1219 if (nGenericVars > 0) { 1220 alenIdx = writeAttr(names.LocalVariableTypeTable); 1221 databuf.appendChar(nGenericVars); 1222 int count = 0; 1223 1224 for (int i=0; i<code.varBufferSize; i++) { 1225 Code.LocalVar var = code.varBuffer[i]; 1226 VarSymbol sym = var.sym; 1227 if (!needsLocalVariableTypeEntry(sym.type)) 1228 continue; 1229 for (Code.LocalVar.Range r : var.aliveRanges) { 1230 // write variable info 1231 databuf.appendChar(r.start_pc); 1232 databuf.appendChar(r.length); 1233 databuf.appendChar(pool.put(sym.name)); 1234 databuf.appendChar(pool.put(typeSig(sym.type))); 1235 databuf.appendChar(var.reg); 1236 count++; 1237 } 1238 } 1239 Assert.check(count == nGenericVars); 1240 endAttr(alenIdx); 1241 acount++; 1242 } 1243 } 1244 1245 if (code.stackMapBufferSize > 0) { 1246 if (debugstackmap) System.out.println("Stack map for " + code.meth); 1247 int alenIdx = writeAttr(code.stackMap.getAttributeName(names)); 1248 writeStackMap(code); 1249 endAttr(alenIdx); 1250 acount++; 1251 } 1252 1253 acount += writeTypeAnnotations(code.meth.getRawTypeAttributes(), true); 1254 1255 endAttrs(acountIdx, acount); 1256 } 1257 //where 1258 private boolean needsLocalVariableTypeEntry(Type t) { 1259 //a local variable needs a type-entry if its type T is generic 1260 //(i.e. |T| != T) and if it's not an intersection type (not supported 1261 //in signature attribute grammar) 1262 return (!types.isSameType(t, types.erasure(t)) && 1263 !t.isCompound()); 1264 } 1265 1266 void writeStackMap(Code code) { 1267 int nframes = code.stackMapBufferSize; 1268 if (debugstackmap) System.out.println(" nframes = " + nframes); 1269 databuf.appendChar(nframes); 1270 1271 switch (code.stackMap) { 1272 case CLDC: 1273 for (int i=0; i<nframes; i++) { 1274 if (debugstackmap) System.out.print(" " + i + ":"); 1275 Code.StackMapFrame frame = code.stackMapBuffer[i]; 1276 1277 // output PC 1278 if (debugstackmap) System.out.print(" pc=" + frame.pc); 1279 databuf.appendChar(frame.pc); 1280 1281 // output locals 1282 int localCount = 0; 1283 for (int j=0; j<frame.locals.length; 1284 j += Code.width(frame.locals[j])) { 1285 localCount++; 1286 } 1287 if (debugstackmap) System.out.print(" nlocals=" + 1288 localCount); 1289 databuf.appendChar(localCount); 1290 for (int j=0; j<frame.locals.length; 1291 j += Code.width(frame.locals[j])) { 1292 if (debugstackmap) System.out.print(" local[" + j + "]="); 1293 writeStackMapType(frame.locals[j]); 1294 } 1295 1296 // output stack 1297 int stackCount = 0; 1298 for (int j=0; j<frame.stack.length; 1299 j += Code.width(frame.stack[j])) { 1300 stackCount++; 1301 } 1302 if (debugstackmap) System.out.print(" nstack=" + 1303 stackCount); 1304 databuf.appendChar(stackCount); 1305 for (int j=0; j<frame.stack.length; 1306 j += Code.width(frame.stack[j])) { 1307 if (debugstackmap) System.out.print(" stack[" + j + "]="); 1308 writeStackMapType(frame.stack[j]); 1309 } 1310 if (debugstackmap) System.out.println(); 1311 } 1312 break; 1313 case JSR202: { 1314 Assert.checkNull(code.stackMapBuffer); 1315 for (int i=0; i<nframes; i++) { 1316 if (debugstackmap) System.out.print(" " + i + ":"); 1317 StackMapTableFrame frame = code.stackMapTableBuffer[i]; 1318 frame.write(this); 1319 if (debugstackmap) System.out.println(); 1320 } 1321 break; 1322 } 1323 default: 1324 throw new AssertionError("Unexpected stackmap format value"); 1325 } 1326 } 1327 1328 //where 1329 void writeStackMapType(Type t) { 1330 if (t == null) { 1331 if (debugstackmap) System.out.print("empty"); 1332 databuf.appendByte(0); 1333 } 1334 else switch(t.getTag()) { 1335 case BYTE: 1336 case CHAR: 1337 case SHORT: 1338 case INT: 1339 case BOOLEAN: 1340 if (debugstackmap) System.out.print("int"); 1341 databuf.appendByte(1); 1342 break; 1343 case FLOAT: 1344 if (debugstackmap) System.out.print("float"); 1345 databuf.appendByte(2); 1346 break; 1347 case DOUBLE: 1348 if (debugstackmap) System.out.print("double"); 1349 databuf.appendByte(3); 1350 break; 1351 case LONG: 1352 if (debugstackmap) System.out.print("long"); 1353 databuf.appendByte(4); 1354 break; 1355 case BOT: // null 1356 if (debugstackmap) System.out.print("null"); 1357 databuf.appendByte(5); 1358 break; 1359 case CLASS: 1360 case ARRAY: 1361 if (debugstackmap) System.out.print("object(" + t + ")"); 1362 databuf.appendByte(7); 1363 databuf.appendChar(pool.put(t)); 1364 break; 1365 case TYPEVAR: 1366 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")"); 1367 databuf.appendByte(7); 1368 databuf.appendChar(pool.put(types.erasure(t).tsym)); 1369 break; 1370 case UNINITIALIZED_THIS: 1371 if (debugstackmap) System.out.print("uninit_this"); 1372 databuf.appendByte(6); 1373 break; 1374 case UNINITIALIZED_OBJECT: 1375 { UninitializedType uninitType = (UninitializedType)t; 1376 databuf.appendByte(8); 1377 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset); 1378 databuf.appendChar(uninitType.offset); 1379 } 1380 break; 1381 default: 1382 throw new AssertionError(); 1383 } 1384 } 1385 1386 /** An entry in the JSR202 StackMapTable */ 1387 abstract static class StackMapTableFrame { 1388 abstract int getFrameType(); 1389 1390 void write(ClassWriter writer) { 1391 int frameType = getFrameType(); 1392 writer.databuf.appendByte(frameType); 1393 if (writer.debugstackmap) System.out.print(" frame_type=" + frameType); 1394 } 1395 1396 static class SameFrame extends StackMapTableFrame { 1397 final int offsetDelta; 1398 SameFrame(int offsetDelta) { 1399 this.offsetDelta = offsetDelta; 1400 } 1401 int getFrameType() { 1402 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED; 1403 } 1404 @Override 1405 void write(ClassWriter writer) { 1406 super.write(writer); 1407 if (getFrameType() == SAME_FRAME_EXTENDED) { 1408 writer.databuf.appendChar(offsetDelta); 1409 if (writer.debugstackmap){ 1410 System.out.print(" offset_delta=" + offsetDelta); 1411 } 1412 } 1413 } 1414 } 1415 1416 static class SameLocals1StackItemFrame extends StackMapTableFrame { 1417 final int offsetDelta; 1418 final Type stack; 1419 SameLocals1StackItemFrame(int offsetDelta, Type stack) { 1420 this.offsetDelta = offsetDelta; 1421 this.stack = stack; 1422 } 1423 int getFrameType() { 1424 return (offsetDelta < SAME_FRAME_SIZE) ? 1425 (SAME_FRAME_SIZE + offsetDelta) : 1426 SAME_LOCALS_1_STACK_ITEM_EXTENDED; 1427 } 1428 @Override 1429 void write(ClassWriter writer) { 1430 super.write(writer); 1431 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) { 1432 writer.databuf.appendChar(offsetDelta); 1433 if (writer.debugstackmap) { 1434 System.out.print(" offset_delta=" + offsetDelta); 1435 } 1436 } 1437 if (writer.debugstackmap) { 1438 System.out.print(" stack[" + 0 + "]="); 1439 } 1440 writer.writeStackMapType(stack); 1441 } 1442 } 1443 1444 static class ChopFrame extends StackMapTableFrame { 1445 final int frameType; 1446 final int offsetDelta; 1447 ChopFrame(int frameType, int offsetDelta) { 1448 this.frameType = frameType; 1449 this.offsetDelta = offsetDelta; 1450 } 1451 int getFrameType() { return frameType; } 1452 @Override 1453 void write(ClassWriter writer) { 1454 super.write(writer); 1455 writer.databuf.appendChar(offsetDelta); 1456 if (writer.debugstackmap) { 1457 System.out.print(" offset_delta=" + offsetDelta); 1458 } 1459 } 1460 } 1461 1462 static class AppendFrame extends StackMapTableFrame { 1463 final int frameType; 1464 final int offsetDelta; 1465 final Type[] locals; 1466 AppendFrame(int frameType, int offsetDelta, Type[] locals) { 1467 this.frameType = frameType; 1468 this.offsetDelta = offsetDelta; 1469 this.locals = locals; 1470 } 1471 int getFrameType() { return frameType; } 1472 @Override 1473 void write(ClassWriter writer) { 1474 super.write(writer); 1475 writer.databuf.appendChar(offsetDelta); 1476 if (writer.debugstackmap) { 1477 System.out.print(" offset_delta=" + offsetDelta); 1478 } 1479 for (int i=0; i<locals.length; i++) { 1480 if (writer.debugstackmap) System.out.print(" locals[" + i + "]="); 1481 writer.writeStackMapType(locals[i]); 1482 } 1483 } 1484 } 1485 1486 static class FullFrame extends StackMapTableFrame { 1487 final int offsetDelta; 1488 final Type[] locals; 1489 final Type[] stack; 1490 FullFrame(int offsetDelta, Type[] locals, Type[] stack) { 1491 this.offsetDelta = offsetDelta; 1492 this.locals = locals; 1493 this.stack = stack; 1494 } 1495 int getFrameType() { return FULL_FRAME; } 1496 @Override 1497 void write(ClassWriter writer) { 1498 super.write(writer); 1499 writer.databuf.appendChar(offsetDelta); 1500 writer.databuf.appendChar(locals.length); 1501 if (writer.debugstackmap) { 1502 System.out.print(" offset_delta=" + offsetDelta); 1503 System.out.print(" nlocals=" + locals.length); 1504 } 1505 for (int i=0; i<locals.length; i++) { 1506 if (writer.debugstackmap) System.out.print(" locals[" + i + "]="); 1507 writer.writeStackMapType(locals[i]); 1508 } 1509 1510 writer.databuf.appendChar(stack.length); 1511 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); } 1512 for (int i=0; i<stack.length; i++) { 1513 if (writer.debugstackmap) System.out.print(" stack[" + i + "]="); 1514 writer.writeStackMapType(stack[i]); 1515 } 1516 } 1517 } 1518 1519 /** Compare this frame with the previous frame and produce 1520 * an entry of compressed stack map frame. */ 1521 static StackMapTableFrame getInstance(Code.StackMapFrame this_frame, 1522 int prev_pc, 1523 Type[] prev_locals, 1524 Types types) { 1525 Type[] locals = this_frame.locals; 1526 Type[] stack = this_frame.stack; 1527 int offset_delta = this_frame.pc - prev_pc - 1; 1528 if (stack.length == 1) { 1529 if (locals.length == prev_locals.length 1530 && compare(prev_locals, locals, types) == 0) { 1531 return new SameLocals1StackItemFrame(offset_delta, stack[0]); 1532 } 1533 } else if (stack.length == 0) { 1534 int diff_length = compare(prev_locals, locals, types); 1535 if (diff_length == 0) { 1536 return new SameFrame(offset_delta); 1537 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) { 1538 // APPEND 1539 Type[] local_diff = new Type[-diff_length]; 1540 for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) { 1541 local_diff[j] = locals[i]; 1542 } 1543 return new AppendFrame(SAME_FRAME_EXTENDED - diff_length, 1544 offset_delta, 1545 local_diff); 1546 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) { 1547 // CHOP 1548 return new ChopFrame(SAME_FRAME_EXTENDED - diff_length, 1549 offset_delta); 1550 } 1551 } 1552 // FULL_FRAME 1553 return new FullFrame(offset_delta, locals, stack); 1554 } 1555 1556 static boolean isInt(Type t) { 1557 return (t.getTag().isStrictSubRangeOf(INT) || t.hasTag(BOOLEAN)); 1558 } 1559 1560 static boolean isSameType(Type t1, Type t2, Types types) { 1561 if (t1 == null) { return t2 == null; } 1562 if (t2 == null) { return false; } 1563 1564 if (isInt(t1) && isInt(t2)) { return true; } 1565 1566 if (t1.hasTag(UNINITIALIZED_THIS)) { 1567 return t2.hasTag(UNINITIALIZED_THIS); 1568 } else if (t1.hasTag(UNINITIALIZED_OBJECT)) { 1569 if (t2.hasTag(UNINITIALIZED_OBJECT)) { 1570 return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset; 1571 } else { 1572 return false; 1573 } 1574 } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) { 1575 return false; 1576 } 1577 1578 return types.isSameType(t1, t2); 1579 } 1580 1581 static int compare(Type[] arr1, Type[] arr2, Types types) { 1582 int diff_length = arr1.length - arr2.length; 1583 if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) { 1584 return Integer.MAX_VALUE; 1585 } 1586 int len = (diff_length > 0) ? arr2.length : arr1.length; 1587 for (int i=0; i<len; i++) { 1588 if (!isSameType(arr1[i], arr2[i], types)) { 1589 return Integer.MAX_VALUE; 1590 } 1591 } 1592 return diff_length; 1593 } 1594 } 1595 1596 void writeFields(Scope s) { 1597 // process them in reverse sibling order; 1598 // i.e., process them in declaration order. 1599 List<VarSymbol> vars = List.nil(); 1600 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) { 1601 if (sym.kind == VAR) vars = vars.prepend((VarSymbol)sym); 1602 } 1603 while (vars.nonEmpty()) { 1604 writeField(vars.head); 1605 vars = vars.tail; 1606 } 1607 } 1608 1609 void writeMethods(Scope s) { 1610 List<MethodSymbol> methods = List.nil(); 1611 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) { 1612 if (sym.kind == MTH && (sym.flags() & HYPOTHETICAL) == 0) 1613 methods = methods.prepend((MethodSymbol)sym); 1614 } 1615 while (methods.nonEmpty()) { 1616 writeMethod(methods.head); 1617 methods = methods.tail; 1618 } 1619 } 1620 1621 /** Emit a class file for a given class. 1622 * @param c The class from which a class file is generated. 1623 */ 1624 public JavaFileObject writeClass(ClassSymbol c) 1625 throws IOException, PoolOverflow, StringOverflow 1626 { 1627 String name = (c.owner.kind == MDL ? c.name : c.flatname).toString(); 1628 Location outLocn; 1629 if (multiModuleMode) { 1630 ModuleSymbol msym = c.owner.kind == MDL ? (ModuleSymbol) c.owner : c.packge().modle; 1631 outLocn = fileManager.getModuleLocation(CLASS_OUTPUT, msym.name.toString()); 1632 } else { 1633 outLocn = CLASS_OUTPUT; 1634 } 1635 JavaFileObject outFile 1636 = fileManager.getJavaFileForOutput(outLocn, 1637 name, 1638 JavaFileObject.Kind.CLASS, 1639 c.sourcefile); 1640 OutputStream out = outFile.openOutputStream(); 1641 try { 1642 writeClassFile(out, c); 1643 if (verbose) 1644 log.printVerbose("wrote.file", outFile); 1645 out.close(); 1646 out = null; 1647 } finally { 1648 if (out != null) { 1649 // if we are propagating an exception, delete the file 1650 out.close(); 1651 outFile.delete(); 1652 outFile = null; 1653 } 1654 } 1655 return outFile; // may be null if write failed 1656 } 1657 1658 /** Write class `c' to outstream `out'. 1659 */ 1660 public void writeClassFile(OutputStream out, ClassSymbol c) 1661 throws IOException, PoolOverflow, StringOverflow { 1662 Assert.check((c.flags() & COMPOUND) == 0); 1663 databuf.reset(); 1664 poolbuf.reset(); 1665 signatureGen.reset(); 1666 pool = c.pool; 1667 innerClasses = null; 1668 innerClassesQueue = null; 1669 bootstrapMethods = new LinkedHashMap<>(); 1670 1671 Type supertype = types.supertype(c.type); 1672 List<Type> interfaces = types.interfaces(c.type); 1673 List<Type> typarams = c.type.getTypeArguments(); 1674 1675 int flags; 1676 if (c.owner.kind == MDL) { 1677 flags = ACC_MODULE; 1678 } else { 1679 flags = adjustFlags(c.flags() & ~DEFAULT); 1680 if ((flags & PROTECTED) != 0) flags |= PUBLIC; 1681 flags = flags & ClassFlags & ~STRICTFP; 1682 if ((flags & INTERFACE) == 0) flags |= ACC_SUPER; 1683 if (c.isInner() && c.name.isEmpty()) flags &= ~FINAL; 1684 } 1685 1686 if (dumpClassModifiers) { 1687 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1688 pw.println(); 1689 pw.println("CLASSFILE " + c.getQualifiedName()); 1690 pw.println("---" + flagNames(flags)); 1691 } 1692 databuf.appendChar(flags); 1693 1694 databuf.appendChar(pool.put(c)); 1695 databuf.appendChar(supertype.hasTag(CLASS) ? pool.put(supertype.tsym) : 0); 1696 databuf.appendChar(interfaces.length()); 1697 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail) 1698 databuf.appendChar(pool.put(l.head.tsym)); 1699 int fieldsCount = 0; 1700 int methodsCount = 0; 1701 for (Symbol sym : c.members().getSymbols(NON_RECURSIVE)) { 1702 switch (sym.kind) { 1703 case VAR: fieldsCount++; break; 1704 case MTH: if ((sym.flags() & HYPOTHETICAL) == 0) methodsCount++; 1705 break; 1706 case TYP: enterInner((ClassSymbol)sym); break; 1707 default : Assert.error(); 1708 } 1709 } 1710 1711 if (c.trans_local != null) { 1712 for (ClassSymbol local : c.trans_local) { 1713 enterInner(local); 1714 } 1715 } 1716 1717 databuf.appendChar(fieldsCount); 1718 writeFields(c.members()); 1719 databuf.appendChar(methodsCount); 1720 writeMethods(c.members()); 1721 1722 int acountIdx = beginAttrs(); 1723 int acount = 0; 1724 1725 boolean sigReq = 1726 typarams.length() != 0 || supertype.allparams().length() != 0; 1727 for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail) 1728 sigReq = l.head.allparams().length() != 0; 1729 if (sigReq) { 1730 int alenIdx = writeAttr(names.Signature); 1731 if (typarams.length() != 0) signatureGen.assembleParamsSig(typarams); 1732 signatureGen.assembleSig(supertype); 1733 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail) 1734 signatureGen.assembleSig(l.head); 1735 databuf.appendChar(pool.put(signatureGen.toName())); 1736 signatureGen.reset(); 1737 endAttr(alenIdx); 1738 acount++; 1739 } 1740 1741 if (c.sourcefile != null && emitSourceFile) { 1742 int alenIdx = writeAttr(names.SourceFile); 1743 // WHM 6/29/1999: Strip file path prefix. We do it here at 1744 // the last possible moment because the sourcefile may be used 1745 // elsewhere in error diagnostics. Fixes 4241573. 1746 //databuf.appendChar(c.pool.put(c.sourcefile)); 1747 String simpleName = PathFileObject.getSimpleName(c.sourcefile); 1748 databuf.appendChar(c.pool.put(names.fromString(simpleName))); 1749 endAttr(alenIdx); 1750 acount++; 1751 } 1752 1753 if (genCrt) { 1754 // Append SourceID attribute 1755 int alenIdx = writeAttr(names.SourceID); 1756 databuf.appendChar(c.pool.put(names.fromString(Long.toString(getLastModified(c.sourcefile))))); 1757 endAttr(alenIdx); 1758 acount++; 1759 // Append CompilationID attribute 1760 alenIdx = writeAttr(names.CompilationID); 1761 databuf.appendChar(c.pool.put(names.fromString(Long.toString(System.currentTimeMillis())))); 1762 endAttr(alenIdx); 1763 acount++; 1764 } 1765 1766 acount += writeFlagAttrs(c.flags()); 1767 acount += writeJavaAnnotations(c.getRawAttributes()); 1768 acount += writeTypeAnnotations(c.getRawTypeAttributes(), false); 1769 acount += writeEnclosingMethodAttribute(c); 1770 if (c.owner.kind == MDL) { 1771 acount += writeModuleAttribute(c); 1772 } 1773 acount += writeExtraClassAttributes(c); 1774 1775 poolbuf.appendInt(JAVA_MAGIC); 1776 poolbuf.appendChar(target.minorVersion); 1777 poolbuf.appendChar(target.majorVersion); 1778 1779 writePool(c.pool); 1780 1781 if (innerClasses != null) { 1782 writeInnerClasses(); 1783 acount++; 1784 } 1785 1786 if (!bootstrapMethods.isEmpty()) { 1787 writeBootstrapMethods(); 1788 acount++; 1789 } 1790 1791 endAttrs(acountIdx, acount); 1792 1793 poolbuf.appendBytes(databuf.elems, 0, databuf.length); 1794 out.write(poolbuf.elems, 0, poolbuf.length); 1795 1796 pool = c.pool = null; // to conserve space 1797 } 1798 1799 /**Allows subclasses to write additional class attributes 1800 * 1801 * @return the number of attributes written 1802 */ 1803 protected int writeExtraClassAttributes(ClassSymbol c) { 1804 return 0; 1805 } 1806 1807 int adjustFlags(final long flags) { 1808 int result = (int)flags; 1809 1810 if ((flags & BRIDGE) != 0) 1811 result |= ACC_BRIDGE; 1812 if ((flags & VARARGS) != 0) 1813 result |= ACC_VARARGS; 1814 if ((flags & DEFAULT) != 0) 1815 result &= ~ABSTRACT; 1816 return result; 1817 } 1818 1819 long getLastModified(FileObject filename) { 1820 long mod = 0; 1821 try { 1822 mod = filename.getLastModified(); 1823 } catch (SecurityException e) { 1824 throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage()); 1825 } 1826 return mod; 1827 } 1828} 1829