ClassWriter.java revision 3528:5538ba41cb97
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.main.Option; 51import com.sun.tools.javac.util.*; 52 53import static com.sun.tools.javac.code.Flags.*; 54import static com.sun.tools.javac.code.Kinds.Kind.*; 55import static com.sun.tools.javac.code.Scope.LookupKind.NON_RECURSIVE; 56import static com.sun.tools.javac.code.TypeTag.*; 57import static com.sun.tools.javac.main.Option.*; 58 59import static javax.tools.StandardLocation.CLASS_OUTPUT; 60 61/** This class provides operations to map an internal symbol table graph 62 * rooted in a ClassSymbol into a classfile. 63 * 64 * <p><b>This is NOT part of any supported API. 65 * If you write code that depends on this, you do so at your own risk. 66 * This code and its internal interfaces are subject to change or 67 * deletion without notice.</b> 68 */ 69public class ClassWriter extends ClassFile { 70 protected static final Context.Key<ClassWriter> classWriterKey = new Context.Key<>(); 71 72 private final Options options; 73 74 /** Switch: verbose output. 75 */ 76 private boolean verbose; 77 78 /** Switch: emit source file attribute. 79 */ 80 private boolean emitSourceFile; 81 82 /** Switch: generate CharacterRangeTable attribute. 83 */ 84 private boolean genCrt; 85 86 /** Switch: describe the generated stackmap. 87 */ 88 private boolean debugstackmap; 89 90 /** 91 * Target class version. 92 */ 93 private Target target; 94 95 /** 96 * Source language version. 97 */ 98 private Source source; 99 100 /** Type utilities. */ 101 private Types types; 102 103 /** 104 * If true, class files will be written in module-specific subdirectories 105 * of the CLASS_OUTPUT location. 106 */ 107 public boolean multiModuleMode; 108 109 /** The initial sizes of the data and constant pool buffers. 110 * Sizes are increased when buffers get full. 111 */ 112 static final int DATA_BUF_SIZE = 0x0fff0; 113 static final int POOL_BUF_SIZE = 0x1fff0; 114 115 /** An output buffer for member info. 116 */ 117 ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE); 118 119 /** An output buffer for the constant pool. 120 */ 121 ByteBuffer poolbuf = new ByteBuffer(POOL_BUF_SIZE); 122 123 /** The constant pool. 124 */ 125 Pool pool; 126 127 /** The inner classes to be written, as a set. 128 */ 129 Set<ClassSymbol> innerClasses; 130 131 /** The inner classes to be written, as a queue where 132 * enclosing classes come first. 133 */ 134 ListBuffer<ClassSymbol> innerClassesQueue; 135 136 /** The bootstrap methods to be written in the corresponding class attribute 137 * (one for each invokedynamic) 138 */ 139 Map<DynamicMethod.BootstrapMethodsKey, DynamicMethod.BootstrapMethodsValue> bootstrapMethods; 140 141 /** The log to use for verbose output. 142 */ 143 private final Log log; 144 145 /** The name table. */ 146 private final Names names; 147 148 /** Access to files. */ 149 private final JavaFileManager fileManager; 150 151 /** Sole signature generator */ 152 private final CWSignatureGenerator signatureGen; 153 154 /** The tags and constants used in compressed stackmap. */ 155 static final int SAME_FRAME_SIZE = 64; 156 static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247; 157 static final int SAME_FRAME_EXTENDED = 251; 158 static final int FULL_FRAME = 255; 159 static final int MAX_LOCAL_LENGTH_DIFF = 4; 160 161 /** Get the ClassWriter instance for this context. */ 162 public static ClassWriter instance(Context context) { 163 ClassWriter instance = context.get(classWriterKey); 164 if (instance == null) 165 instance = new ClassWriter(context); 166 return instance; 167 } 168 169 /** Construct a class writer, given an options table. 170 */ 171 protected ClassWriter(Context context) { 172 context.put(classWriterKey, this); 173 174 log = Log.instance(context); 175 names = Names.instance(context); 176 options = Options.instance(context); 177 target = Target.instance(context); 178 source = Source.instance(context); 179 types = Types.instance(context); 180 fileManager = context.get(JavaFileManager.class); 181 signatureGen = new CWSignatureGenerator(types); 182 183 verbose = options.isSet(VERBOSE); 184 genCrt = options.isSet(XJCOV); 185 debugstackmap = options.isSet("debug.stackmap"); 186 187 emitSourceFile = options.isUnset(G_CUSTOM) || 188 options.isSet(G_CUSTOM, "source"); 189 190 String modifierFlags = options.get("debug.dumpmodifiers"); 191 if (modifierFlags != null) { 192 dumpClassModifiers = modifierFlags.indexOf('c') != -1; 193 dumpFieldModifiers = modifierFlags.indexOf('f') != -1; 194 dumpInnerClassModifiers = modifierFlags.indexOf('i') != -1; 195 dumpMethodModifiers = modifierFlags.indexOf('m') != -1; 196 } 197 } 198 199/****************************************************************** 200 * Diagnostics: dump generated class names and modifiers 201 ******************************************************************/ 202 203 /** Value of option 'dumpmodifiers' is a string 204 * indicating which modifiers should be dumped for debugging: 205 * 'c' -- classes 206 * 'f' -- fields 207 * 'i' -- innerclass attributes 208 * 'm' -- methods 209 * For example, to dump everything: 210 * javac -XDdumpmodifiers=cifm MyProg.java 211 */ 212 private boolean dumpClassModifiers; // -XDdumpmodifiers=c 213 private boolean dumpFieldModifiers; // -XDdumpmodifiers=f 214 private boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i 215 private boolean dumpMethodModifiers; // -XDdumpmodifiers=m 216 217 218 /** Return flags as a string, separated by " ". 219 */ 220 public static String flagNames(long flags) { 221 StringBuilder sbuf = new StringBuilder(); 222 int i = 0; 223 long f = flags & StandardFlags; 224 while (f != 0) { 225 if ((f & 1) != 0) { 226 sbuf.append(" "); 227 sbuf.append(flagName[i]); 228 } 229 f = f >> 1; 230 i++; 231 } 232 return sbuf.toString(); 233 } 234 //where 235 private final static String[] flagName = { 236 "PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL", 237 "SUPER", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE", 238 "ABSTRACT", "STRICTFP"}; 239 240/****************************************************************** 241 * Output routines 242 ******************************************************************/ 243 244 /** Write a character into given byte buffer; 245 * byte buffer will not be grown. 246 */ 247 void putChar(ByteBuffer buf, int op, int x) { 248 buf.elems[op ] = (byte)((x >> 8) & 0xFF); 249 buf.elems[op+1] = (byte)((x ) & 0xFF); 250 } 251 252 /** Write an integer into given byte buffer; 253 * byte buffer will not be grown. 254 */ 255 void putInt(ByteBuffer buf, int adr, int x) { 256 buf.elems[adr ] = (byte)((x >> 24) & 0xFF); 257 buf.elems[adr+1] = (byte)((x >> 16) & 0xFF); 258 buf.elems[adr+2] = (byte)((x >> 8) & 0xFF); 259 buf.elems[adr+3] = (byte)((x ) & 0xFF); 260 } 261 262 /** 263 * Signature Generation 264 */ 265 private class CWSignatureGenerator extends Types.SignatureGenerator { 266 267 /** 268 * An output buffer for type signatures. 269 */ 270 ByteBuffer sigbuf = new ByteBuffer(); 271 272 CWSignatureGenerator(Types types) { 273 super(types); 274 } 275 276 /** 277 * Assemble signature of given type in string buffer. 278 * Check for uninitialized types before calling the general case. 279 */ 280 @Override 281 public void assembleSig(Type type) { 282 switch (type.getTag()) { 283 case UNINITIALIZED_THIS: 284 case UNINITIALIZED_OBJECT: 285 // we don't yet have a spec for uninitialized types in the 286 // local variable table 287 assembleSig(types.erasure(((UninitializedType)type).qtype)); 288 break; 289 default: 290 super.assembleSig(type); 291 } 292 } 293 294 @Override 295 protected void append(char ch) { 296 sigbuf.appendByte(ch); 297 } 298 299 @Override 300 protected void append(byte[] ba) { 301 sigbuf.appendBytes(ba); 302 } 303 304 @Override 305 protected void append(Name name) { 306 sigbuf.appendName(name); 307 } 308 309 @Override 310 protected void classReference(ClassSymbol c) { 311 enterInner(c); 312 } 313 314 private void reset() { 315 sigbuf.reset(); 316 } 317 318 private Name toName() { 319 return sigbuf.toName(names); 320 } 321 322 private boolean isEmpty() { 323 return sigbuf.length == 0; 324 } 325 } 326 327 /** 328 * Return signature of given type 329 */ 330 Name typeSig(Type type) { 331 Assert.check(signatureGen.isEmpty()); 332 //- System.out.println(" ? " + type); 333 signatureGen.assembleSig(type); 334 Name n = signatureGen.toName(); 335 signatureGen.reset(); 336 //- System.out.println(" " + n); 337 return n; 338 } 339 340 /** Given a type t, return the extended class name of its erasure in 341 * external representation. 342 */ 343 public Name xClassName(Type t) { 344 if (t.hasTag(CLASS)) { 345 return names.fromUtf(externalize(t.tsym.flatName())); 346 } else if (t.hasTag(ARRAY)) { 347 return typeSig(types.erasure(t)); 348 } else { 349 throw new AssertionError("xClassName expects class or array type, got " + t); 350 } 351 } 352 353/****************************************************************** 354 * Writing the Constant Pool 355 ******************************************************************/ 356 357 /** Thrown when the constant pool is over full. 358 */ 359 public static class PoolOverflow extends Exception { 360 private static final long serialVersionUID = 0; 361 public PoolOverflow() {} 362 } 363 public static class StringOverflow extends Exception { 364 private static final long serialVersionUID = 0; 365 public final String value; 366 public StringOverflow(String s) { 367 value = s; 368 } 369 } 370 371 /** Write constant pool to pool buffer. 372 * Note: during writing, constant pool 373 * might grow since some parts of constants still need to be entered. 374 */ 375 void writePool(Pool pool) throws PoolOverflow, StringOverflow { 376 int poolCountIdx = poolbuf.length; 377 poolbuf.appendChar(0); 378 int i = 1; 379 while (i < pool.pp) { 380 Object value = pool.pool[i]; 381 Assert.checkNonNull(value); 382 if (value instanceof Method || value instanceof Variable) 383 value = ((DelegatedSymbol)value).getUnderlyingSymbol(); 384 385 if (value instanceof MethodSymbol) { 386 MethodSymbol m = (MethodSymbol)value; 387 if (!m.isDynamic()) { 388 poolbuf.appendByte((m.owner.flags() & INTERFACE) != 0 389 ? CONSTANT_InterfaceMethodref 390 : CONSTANT_Methodref); 391 poolbuf.appendChar(pool.put(m.owner)); 392 poolbuf.appendChar(pool.put(nameType(m))); 393 } else { 394 //invokedynamic 395 DynamicMethodSymbol dynSym = (DynamicMethodSymbol)m; 396 MethodHandle handle = new MethodHandle(dynSym.bsmKind, dynSym.bsm, types); 397 DynamicMethod.BootstrapMethodsKey key = new DynamicMethod.BootstrapMethodsKey(dynSym, types); 398 399 // Figure out the index for existing BSM; create a new BSM if no key 400 DynamicMethod.BootstrapMethodsValue val = bootstrapMethods.get(key); 401 if (val == null) { 402 int index = bootstrapMethods.size(); 403 val = new DynamicMethod.BootstrapMethodsValue(handle, index); 404 bootstrapMethods.put(key, val); 405 } 406 407 //init cp entries 408 pool.put(names.BootstrapMethods); 409 pool.put(handle); 410 for (Object staticArg : dynSym.staticArgs) { 411 pool.put(staticArg); 412 } 413 poolbuf.appendByte(CONSTANT_InvokeDynamic); 414 poolbuf.appendChar(val.index); 415 poolbuf.appendChar(pool.put(nameType(dynSym))); 416 } 417 } else if (value instanceof VarSymbol) { 418 VarSymbol v = (VarSymbol)value; 419 poolbuf.appendByte(CONSTANT_Fieldref); 420 poolbuf.appendChar(pool.put(v.owner)); 421 poolbuf.appendChar(pool.put(nameType(v))); 422 } else if (value instanceof Name) { 423 poolbuf.appendByte(CONSTANT_Utf8); 424 byte[] bs = ((Name)value).toUtf(); 425 poolbuf.appendChar(bs.length); 426 poolbuf.appendBytes(bs, 0, bs.length); 427 if (bs.length > Pool.MAX_STRING_LENGTH) 428 throw new StringOverflow(value.toString()); 429 } else if (value instanceof ClassSymbol) { 430 ClassSymbol c = (ClassSymbol)value; 431 if (c.owner.kind == TYP) pool.put(c.owner); 432 poolbuf.appendByte(CONSTANT_Class); 433 if (c.type.hasTag(ARRAY)) { 434 poolbuf.appendChar(pool.put(typeSig(c.type))); 435 } else { 436 poolbuf.appendChar(pool.put(names.fromUtf(externalize(c.flatname)))); 437 enterInner(c); 438 } 439 } else if (value instanceof NameAndType) { 440 NameAndType nt = (NameAndType)value; 441 poolbuf.appendByte(CONSTANT_NameandType); 442 poolbuf.appendChar(pool.put(nt.name)); 443 poolbuf.appendChar(pool.put(typeSig(nt.uniqueType.type))); 444 } else if (value instanceof Integer) { 445 poolbuf.appendByte(CONSTANT_Integer); 446 poolbuf.appendInt(((Integer)value).intValue()); 447 } else if (value instanceof Long) { 448 poolbuf.appendByte(CONSTANT_Long); 449 poolbuf.appendLong(((Long)value).longValue()); 450 i++; 451 } else if (value instanceof Float) { 452 poolbuf.appendByte(CONSTANT_Float); 453 poolbuf.appendFloat(((Float)value).floatValue()); 454 } else if (value instanceof Double) { 455 poolbuf.appendByte(CONSTANT_Double); 456 poolbuf.appendDouble(((Double)value).doubleValue()); 457 i++; 458 } else if (value instanceof String) { 459 poolbuf.appendByte(CONSTANT_String); 460 poolbuf.appendChar(pool.put(names.fromString((String)value))); 461 } else if (value instanceof UniqueType) { 462 Type type = ((UniqueType)value).type; 463 if (type.hasTag(METHOD)) { 464 poolbuf.appendByte(CONSTANT_MethodType); 465 poolbuf.appendChar(pool.put(typeSig((MethodType)type))); 466 } else { 467 Assert.check(type.hasTag(ARRAY)); 468 poolbuf.appendByte(CONSTANT_Class); 469 poolbuf.appendChar(pool.put(xClassName(type))); 470 } 471 } else if (value instanceof MethodHandle) { 472 MethodHandle ref = (MethodHandle)value; 473 poolbuf.appendByte(CONSTANT_MethodHandle); 474 poolbuf.appendByte(ref.refKind); 475 poolbuf.appendChar(pool.put(ref.refSym)); 476 } else { 477 Assert.error("writePool " + value); 478 } 479 i++; 480 } 481 if (pool.pp > Pool.MAX_ENTRIES) 482 throw new PoolOverflow(); 483 putChar(poolbuf, poolCountIdx, pool.pp); 484 } 485 486 /** Given a symbol, return its name-and-type. 487 */ 488 NameAndType nameType(Symbol sym) { 489 return new NameAndType(sym.name, sym.externalType(types), types); 490 // the NameAndType is generated from a symbol reference, and the 491 // adjustment of adding an additional this$n parameter needs to be made. 492 } 493 494/****************************************************************** 495 * Writing Attributes 496 ******************************************************************/ 497 498 /** Write header for an attribute to data buffer and return 499 * position past attribute length index. 500 */ 501 int writeAttr(Name attrName) { 502 databuf.appendChar(pool.put(attrName)); 503 databuf.appendInt(0); 504 return databuf.length; 505 } 506 507 /** Fill in attribute length. 508 */ 509 void endAttr(int index) { 510 putInt(databuf, index - 4, databuf.length - index); 511 } 512 513 /** Leave space for attribute count and return index for 514 * number of attributes field. 515 */ 516 int beginAttrs() { 517 databuf.appendChar(0); 518 return databuf.length; 519 } 520 521 /** Fill in number of attributes. 522 */ 523 void endAttrs(int index, int count) { 524 putChar(databuf, index - 2, count); 525 } 526 527 /** Write the EnclosingMethod attribute if needed. 528 * Returns the number of attributes written (0 or 1). 529 */ 530 int writeEnclosingMethodAttribute(ClassSymbol c) { 531 return writeEnclosingMethodAttribute(names.EnclosingMethod, c); 532 } 533 534 /** Write the EnclosingMethod attribute with a specified name. 535 * Returns the number of attributes written (0 or 1). 536 */ 537 protected int writeEnclosingMethodAttribute(Name attributeName, ClassSymbol c) { 538 if (c.owner.kind != MTH && // neither a local class 539 c.name != names.empty) // nor anonymous 540 return 0; 541 542 int alenIdx = writeAttr(attributeName); 543 ClassSymbol enclClass = c.owner.enclClass(); 544 MethodSymbol enclMethod = 545 (c.owner.type == null // local to init block 546 || c.owner.kind != MTH) // or member init 547 ? null 548 : (MethodSymbol)c.owner; 549 databuf.appendChar(pool.put(enclClass)); 550 databuf.appendChar(enclMethod == null ? 0 : pool.put(nameType(c.owner))); 551 endAttr(alenIdx); 552 return 1; 553 } 554 555 /** Write flag attributes; return number of attributes written. 556 */ 557 int writeFlagAttrs(long flags) { 558 int acount = 0; 559 if ((flags & DEPRECATED) != 0) { 560 int alenIdx = writeAttr(names.Deprecated); 561 endAttr(alenIdx); 562 acount++; 563 } 564 return acount; 565 } 566 567 /** Write member (field or method) attributes; 568 * return number of attributes written. 569 */ 570 int writeMemberAttrs(Symbol sym) { 571 int acount = writeFlagAttrs(sym.flags()); 572 long flags = sym.flags(); 573 if ((flags & (SYNTHETIC | BRIDGE)) != SYNTHETIC && 574 (flags & ANONCONSTR) == 0 && 575 (!types.isSameType(sym.type, sym.erasure(types)) || 576 signatureGen.hasTypeVar(sym.type.getThrownTypes()))) { 577 // note that a local class with captured variables 578 // will get a signature attribute 579 int alenIdx = writeAttr(names.Signature); 580 databuf.appendChar(pool.put(typeSig(sym.type))); 581 endAttr(alenIdx); 582 acount++; 583 } 584 acount += writeJavaAnnotations(sym.getRawAttributes()); 585 acount += writeTypeAnnotations(sym.getRawTypeAttributes(), false); 586 return acount; 587 } 588 589 /** 590 * Write method parameter names attribute. 591 */ 592 int writeMethodParametersAttr(MethodSymbol m) { 593 MethodType ty = m.externalType(types).asMethodType(); 594 final int allparams = ty.argtypes.size(); 595 if (m.params != null && allparams != 0) { 596 final int attrIndex = writeAttr(names.MethodParameters); 597 databuf.appendByte(allparams); 598 // Write extra parameters first 599 for (VarSymbol s : m.extraParams) { 600 final int flags = 601 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) | 602 ((int) m.flags() & SYNTHETIC); 603 databuf.appendChar(pool.put(s.name)); 604 databuf.appendChar(flags); 605 } 606 // Now write the real parameters 607 for (VarSymbol s : m.params) { 608 final int flags = 609 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) | 610 ((int) m.flags() & SYNTHETIC); 611 databuf.appendChar(pool.put(s.name)); 612 databuf.appendChar(flags); 613 } 614 // Now write the captured locals 615 for (VarSymbol s : m.capturedLocals) { 616 final int flags = 617 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) | 618 ((int) m.flags() & SYNTHETIC); 619 databuf.appendChar(pool.put(s.name)); 620 databuf.appendChar(flags); 621 } 622 endAttr(attrIndex); 623 return 1; 624 } else 625 return 0; 626 } 627 628 629 private void writeParamAnnotations(List<VarSymbol> params, 630 RetentionPolicy retention) { 631 for (VarSymbol s : params) { 632 ListBuffer<Attribute.Compound> buf = new ListBuffer<>(); 633 for (Attribute.Compound a : s.getRawAttributes()) 634 if (types.getRetention(a) == retention) 635 buf.append(a); 636 databuf.appendChar(buf.length()); 637 for (Attribute.Compound a : buf) 638 writeCompoundAttribute(a); 639 } 640 641 } 642 643 private void writeParamAnnotations(MethodSymbol m, 644 RetentionPolicy retention) { 645 databuf.appendByte(m.params.length()); 646 writeParamAnnotations(m.params, retention); 647 } 648 649 /** Write method parameter annotations; 650 * return number of attributes written. 651 */ 652 int writeParameterAttrs(MethodSymbol m) { 653 boolean hasVisible = false; 654 boolean hasInvisible = false; 655 if (m.params != null) { 656 for (VarSymbol s : m.params) { 657 for (Attribute.Compound a : s.getRawAttributes()) { 658 switch (types.getRetention(a)) { 659 case SOURCE: break; 660 case CLASS: hasInvisible = true; break; 661 case RUNTIME: hasVisible = true; break; 662 default: // /* fail soft */ throw new AssertionError(vis); 663 } 664 } 665 } 666 } 667 668 int attrCount = 0; 669 if (hasVisible) { 670 int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations); 671 writeParamAnnotations(m, RetentionPolicy.RUNTIME); 672 endAttr(attrIndex); 673 attrCount++; 674 } 675 if (hasInvisible) { 676 int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations); 677 writeParamAnnotations(m, RetentionPolicy.CLASS); 678 endAttr(attrIndex); 679 attrCount++; 680 } 681 return attrCount; 682 } 683 684/********************************************************************** 685 * Writing Java-language annotations (aka metadata, attributes) 686 **********************************************************************/ 687 688 /** Write Java-language annotations; return number of JVM 689 * attributes written (zero or one). 690 */ 691 int writeJavaAnnotations(List<Attribute.Compound> attrs) { 692 if (attrs.isEmpty()) return 0; 693 ListBuffer<Attribute.Compound> visibles = new ListBuffer<>(); 694 ListBuffer<Attribute.Compound> invisibles = new ListBuffer<>(); 695 for (Attribute.Compound a : attrs) { 696 switch (types.getRetention(a)) { 697 case SOURCE: break; 698 case CLASS: invisibles.append(a); break; 699 case RUNTIME: visibles.append(a); break; 700 default: // /* fail soft */ throw new AssertionError(vis); 701 } 702 } 703 704 int attrCount = 0; 705 if (visibles.length() != 0) { 706 int attrIndex = writeAttr(names.RuntimeVisibleAnnotations); 707 databuf.appendChar(visibles.length()); 708 for (Attribute.Compound a : visibles) 709 writeCompoundAttribute(a); 710 endAttr(attrIndex); 711 attrCount++; 712 } 713 if (invisibles.length() != 0) { 714 int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations); 715 databuf.appendChar(invisibles.length()); 716 for (Attribute.Compound a : invisibles) 717 writeCompoundAttribute(a); 718 endAttr(attrIndex); 719 attrCount++; 720 } 721 return attrCount; 722 } 723 724 int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos, boolean inCode) { 725 if (typeAnnos.isEmpty()) return 0; 726 727 ListBuffer<Attribute.TypeCompound> visibles = new ListBuffer<>(); 728 ListBuffer<Attribute.TypeCompound> invisibles = new ListBuffer<>(); 729 730 for (Attribute.TypeCompound tc : typeAnnos) { 731 if (tc.hasUnknownPosition()) { 732 boolean fixed = tc.tryFixPosition(); 733 734 // Could we fix it? 735 if (!fixed) { 736 // This happens for nested types like @A Outer. @B Inner. 737 // For method parameters we get the annotation twice! Once with 738 // a valid position, once unknown. 739 // TODO: find a cleaner solution. 740 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 741 pw.println("ClassWriter: Position UNKNOWN in type annotation: " + tc); 742 continue; 743 } 744 } 745 746 if (tc.position.type.isLocal() != inCode) 747 continue; 748 if (!tc.position.emitToClassfile()) 749 continue; 750 switch (types.getRetention(tc)) { 751 case SOURCE: break; 752 case CLASS: invisibles.append(tc); break; 753 case RUNTIME: visibles.append(tc); break; 754 default: // /* fail soft */ throw new AssertionError(vis); 755 } 756 } 757 758 int attrCount = 0; 759 if (visibles.length() != 0) { 760 int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations); 761 databuf.appendChar(visibles.length()); 762 for (Attribute.TypeCompound p : visibles) 763 writeTypeAnnotation(p); 764 endAttr(attrIndex); 765 attrCount++; 766 } 767 768 if (invisibles.length() != 0) { 769 int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations); 770 databuf.appendChar(invisibles.length()); 771 for (Attribute.TypeCompound p : invisibles) 772 writeTypeAnnotation(p); 773 endAttr(attrIndex); 774 attrCount++; 775 } 776 777 return attrCount; 778 } 779 780 /** A visitor to write an attribute including its leading 781 * single-character marker. 782 */ 783 class AttributeWriter implements Attribute.Visitor { 784 public void visitConstant(Attribute.Constant _value) { 785 Object value = _value.value; 786 switch (_value.type.getTag()) { 787 case BYTE: 788 databuf.appendByte('B'); 789 break; 790 case CHAR: 791 databuf.appendByte('C'); 792 break; 793 case SHORT: 794 databuf.appendByte('S'); 795 break; 796 case INT: 797 databuf.appendByte('I'); 798 break; 799 case LONG: 800 databuf.appendByte('J'); 801 break; 802 case FLOAT: 803 databuf.appendByte('F'); 804 break; 805 case DOUBLE: 806 databuf.appendByte('D'); 807 break; 808 case BOOLEAN: 809 databuf.appendByte('Z'); 810 break; 811 case CLASS: 812 Assert.check(value instanceof String); 813 databuf.appendByte('s'); 814 value = names.fromString(value.toString()); // CONSTANT_Utf8 815 break; 816 default: 817 throw new AssertionError(_value.type); 818 } 819 databuf.appendChar(pool.put(value)); 820 } 821 public void visitEnum(Attribute.Enum e) { 822 databuf.appendByte('e'); 823 databuf.appendChar(pool.put(typeSig(e.value.type))); 824 databuf.appendChar(pool.put(e.value.name)); 825 } 826 public void visitClass(Attribute.Class clazz) { 827 databuf.appendByte('c'); 828 databuf.appendChar(pool.put(typeSig(types.erasure(clazz.classType)))); 829 } 830 public void visitCompound(Attribute.Compound compound) { 831 databuf.appendByte('@'); 832 writeCompoundAttribute(compound); 833 } 834 public void visitError(Attribute.Error x) { 835 throw new AssertionError(x); 836 } 837 public void visitArray(Attribute.Array array) { 838 databuf.appendByte('['); 839 databuf.appendChar(array.values.length); 840 for (Attribute a : array.values) { 841 a.accept(this); 842 } 843 } 844 } 845 AttributeWriter awriter = new AttributeWriter(); 846 847 /** Write a compound attribute excluding the '@' marker. */ 848 void writeCompoundAttribute(Attribute.Compound c) { 849 databuf.appendChar(pool.put(typeSig(c.type))); 850 databuf.appendChar(c.values.length()); 851 for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) { 852 databuf.appendChar(pool.put(p.fst.name)); 853 p.snd.accept(awriter); 854 } 855 } 856 857 void writeTypeAnnotation(Attribute.TypeCompound c) { 858 writePosition(c.position); 859 writeCompoundAttribute(c); 860 } 861 862 void writePosition(TypeAnnotationPosition p) { 863 databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte 864 switch (p.type) { 865 // instanceof 866 case INSTANCEOF: 867 // new expression 868 case NEW: 869 // constructor/method reference receiver 870 case CONSTRUCTOR_REFERENCE: 871 case METHOD_REFERENCE: 872 databuf.appendChar(p.offset); 873 break; 874 // local variable 875 case LOCAL_VARIABLE: 876 // resource variable 877 case RESOURCE_VARIABLE: 878 databuf.appendChar(p.lvarOffset.length); // for table length 879 for (int i = 0; i < p.lvarOffset.length; ++i) { 880 databuf.appendChar(p.lvarOffset[i]); 881 databuf.appendChar(p.lvarLength[i]); 882 databuf.appendChar(p.lvarIndex[i]); 883 } 884 break; 885 // exception parameter 886 case EXCEPTION_PARAMETER: 887 databuf.appendChar(p.getExceptionIndex()); 888 break; 889 // method receiver 890 case METHOD_RECEIVER: 891 // Do nothing 892 break; 893 // type parameter 894 case CLASS_TYPE_PARAMETER: 895 case METHOD_TYPE_PARAMETER: 896 databuf.appendByte(p.parameter_index); 897 break; 898 // type parameter bound 899 case CLASS_TYPE_PARAMETER_BOUND: 900 case METHOD_TYPE_PARAMETER_BOUND: 901 databuf.appendByte(p.parameter_index); 902 databuf.appendByte(p.bound_index); 903 break; 904 // class extends or implements clause 905 case CLASS_EXTENDS: 906 databuf.appendChar(p.type_index); 907 break; 908 // throws 909 case THROWS: 910 databuf.appendChar(p.type_index); 911 break; 912 // method parameter 913 case METHOD_FORMAL_PARAMETER: 914 databuf.appendByte(p.parameter_index); 915 break; 916 // type cast 917 case CAST: 918 // method/constructor/reference type argument 919 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT: 920 case METHOD_INVOCATION_TYPE_ARGUMENT: 921 case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT: 922 case METHOD_REFERENCE_TYPE_ARGUMENT: 923 databuf.appendChar(p.offset); 924 databuf.appendByte(p.type_index); 925 break; 926 // We don't need to worry about these 927 case METHOD_RETURN: 928 case FIELD: 929 break; 930 case UNKNOWN: 931 throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!"); 932 default: 933 throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p); 934 } 935 936 { // Append location data for generics/arrays. 937 databuf.appendByte(p.location.size()); 938 java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location); 939 for (int i : loc) 940 databuf.appendByte((byte)i); 941 } 942 } 943 944/********************************************************************** 945 * Writing module attributes 946 **********************************************************************/ 947 948 /** Write the Module attribute if needed. 949 * Returns the number of attributes written (0 or 1). 950 */ 951 int writeModuleAttribute(ClassSymbol c) { 952 ModuleSymbol m = (ModuleSymbol) c.owner; 953 954 int alenIdx = writeAttr(names.Module); 955 ListBuffer<RequiresDirective> requires = new ListBuffer<>(); 956 for (RequiresDirective r: m.requires) { 957 if (!r.flags.contains(RequiresFlag.EXTRA)) 958 requires.add(r); 959 } 960 databuf.appendChar(requires.size()); 961 for (RequiresDirective r: requires) { 962 databuf.appendChar(pool.put(r.module.name)); 963 databuf.appendChar(RequiresFlag.value(r.flags)); 964 } 965 966 List<ExportsDirective> exports = m.exports; 967 databuf.appendChar(exports.size()); 968 for (ExportsDirective e: exports) { 969 databuf.appendChar(pool.put(names.fromUtf(externalize(e.packge.flatName())))); 970 if (e.modules == null) { 971 databuf.appendChar(0); 972 } else { 973 databuf.appendChar(e.modules.size()); 974 for (ModuleSymbol msym: e.modules) 975 databuf.appendChar(pool.put(msym.name)); 976 } 977 } 978 979 List<UsesDirective> uses = m.uses; 980 databuf.appendChar(uses.size()); 981 for (UsesDirective s: uses) { 982 databuf.appendChar(pool.put(s.service)); 983 } 984 985 List<ProvidesDirective> services = m.provides; 986 databuf.appendChar(services.size()); 987 for (ProvidesDirective s: services) { 988 databuf.appendChar(pool.put(s.service)); 989 databuf.appendChar(pool.put(s.impl)); 990 } 991 992 endAttr(alenIdx); 993 return 1; 994 } 995 996/********************************************************************** 997 * Writing Objects 998 **********************************************************************/ 999 1000 /** Enter an inner class into the `innerClasses' set/queue. 1001 */ 1002 void enterInner(ClassSymbol c) { 1003 if (c.type.isCompound()) { 1004 throw new AssertionError("Unexpected intersection type: " + c.type); 1005 } 1006 try { 1007 c.complete(); 1008 } catch (CompletionFailure ex) { 1009 System.err.println("error: " + c + ": " + ex.getMessage()); 1010 throw ex; 1011 } 1012 if (!c.type.hasTag(CLASS)) return; // arrays 1013 if (pool != null && // pool might be null if called from xClassName 1014 c.owner.enclClass() != null && 1015 (innerClasses == null || !innerClasses.contains(c))) { 1016// log.errWriter.println("enter inner " + c);//DEBUG 1017 enterInner(c.owner.enclClass()); 1018 pool.put(c); 1019 if (c.name != names.empty) 1020 pool.put(c.name); 1021 if (innerClasses == null) { 1022 innerClasses = new HashSet<>(); 1023 innerClassesQueue = new ListBuffer<>(); 1024 pool.put(names.InnerClasses); 1025 } 1026 innerClasses.add(c); 1027 innerClassesQueue.append(c); 1028 } 1029 } 1030 1031 /** Write "inner classes" attribute. 1032 */ 1033 void writeInnerClasses() { 1034 int alenIdx = writeAttr(names.InnerClasses); 1035 databuf.appendChar(innerClassesQueue.length()); 1036 for (List<ClassSymbol> l = innerClassesQueue.toList(); 1037 l.nonEmpty(); 1038 l = l.tail) { 1039 ClassSymbol inner = l.head; 1040 inner.markAbstractIfNeeded(types); 1041 char flags = (char) adjustFlags(inner.flags_field); 1042 if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT 1043 if (inner.name.isEmpty()) flags &= ~FINAL; // Anonymous class: unset FINAL flag 1044 flags &= ~STRICTFP; //inner classes should not have the strictfp flag set. 1045 if (dumpInnerClassModifiers) { 1046 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1047 pw.println("INNERCLASS " + inner.name); 1048 pw.println("---" + flagNames(flags)); 1049 } 1050 databuf.appendChar(pool.get(inner)); 1051 databuf.appendChar( 1052 inner.owner.kind == TYP && !inner.name.isEmpty() ? pool.get(inner.owner) : 0); 1053 databuf.appendChar( 1054 !inner.name.isEmpty() ? pool.get(inner.name) : 0); 1055 databuf.appendChar(flags); 1056 } 1057 endAttr(alenIdx); 1058 } 1059 1060 /** Write "bootstrapMethods" attribute. 1061 */ 1062 void writeBootstrapMethods() { 1063 int alenIdx = writeAttr(names.BootstrapMethods); 1064 databuf.appendChar(bootstrapMethods.size()); 1065 for (Map.Entry<DynamicMethod.BootstrapMethodsKey, DynamicMethod.BootstrapMethodsValue> entry : bootstrapMethods.entrySet()) { 1066 DynamicMethod.BootstrapMethodsKey bsmKey = entry.getKey(); 1067 //write BSM handle 1068 databuf.appendChar(pool.get(entry.getValue().mh)); 1069 Object[] uniqueArgs = bsmKey.getUniqueArgs(); 1070 //write static args length 1071 databuf.appendChar(uniqueArgs.length); 1072 //write static args array 1073 for (Object o : uniqueArgs) { 1074 databuf.appendChar(pool.get(o)); 1075 } 1076 } 1077 endAttr(alenIdx); 1078 } 1079 1080 /** Write field symbol, entering all references into constant pool. 1081 */ 1082 void writeField(VarSymbol v) { 1083 int flags = adjustFlags(v.flags()); 1084 databuf.appendChar(flags); 1085 if (dumpFieldModifiers) { 1086 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1087 pw.println("FIELD " + v.name); 1088 pw.println("---" + flagNames(v.flags())); 1089 } 1090 databuf.appendChar(pool.put(v.name)); 1091 databuf.appendChar(pool.put(typeSig(v.erasure(types)))); 1092 int acountIdx = beginAttrs(); 1093 int acount = 0; 1094 if (v.getConstValue() != null) { 1095 int alenIdx = writeAttr(names.ConstantValue); 1096 databuf.appendChar(pool.put(v.getConstValue())); 1097 endAttr(alenIdx); 1098 acount++; 1099 } 1100 acount += writeMemberAttrs(v); 1101 endAttrs(acountIdx, acount); 1102 } 1103 1104 /** Write method symbol, entering all references into constant pool. 1105 */ 1106 void writeMethod(MethodSymbol m) { 1107 int flags = adjustFlags(m.flags()); 1108 databuf.appendChar(flags); 1109 if (dumpMethodModifiers) { 1110 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1111 pw.println("METHOD " + m.name); 1112 pw.println("---" + flagNames(m.flags())); 1113 } 1114 databuf.appendChar(pool.put(m.name)); 1115 databuf.appendChar(pool.put(typeSig(m.externalType(types)))); 1116 int acountIdx = beginAttrs(); 1117 int acount = 0; 1118 if (m.code != null) { 1119 int alenIdx = writeAttr(names.Code); 1120 writeCode(m.code); 1121 m.code = null; // to conserve space 1122 endAttr(alenIdx); 1123 acount++; 1124 } 1125 List<Type> thrown = m.erasure(types).getThrownTypes(); 1126 if (thrown.nonEmpty()) { 1127 int alenIdx = writeAttr(names.Exceptions); 1128 databuf.appendChar(thrown.length()); 1129 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail) 1130 databuf.appendChar(pool.put(l.head.tsym)); 1131 endAttr(alenIdx); 1132 acount++; 1133 } 1134 if (m.defaultValue != null) { 1135 int alenIdx = writeAttr(names.AnnotationDefault); 1136 m.defaultValue.accept(awriter); 1137 endAttr(alenIdx); 1138 acount++; 1139 } 1140 if (options.isSet(PARAMETERS)) { 1141 if (!m.isLambdaMethod()) // Per JDK-8138729, do not emit parameters table for lambda bodies. 1142 acount += writeMethodParametersAttr(m); 1143 } 1144 acount += writeMemberAttrs(m); 1145 if (!m.isLambdaMethod()) 1146 acount += writeParameterAttrs(m); 1147 endAttrs(acountIdx, acount); 1148 } 1149 1150 /** Write code attribute of method. 1151 */ 1152 void writeCode(Code code) { 1153 databuf.appendChar(code.max_stack); 1154 databuf.appendChar(code.max_locals); 1155 databuf.appendInt(code.cp); 1156 databuf.appendBytes(code.code, 0, code.cp); 1157 databuf.appendChar(code.catchInfo.length()); 1158 for (List<char[]> l = code.catchInfo.toList(); 1159 l.nonEmpty(); 1160 l = l.tail) { 1161 for (int i = 0; i < l.head.length; i++) 1162 databuf.appendChar(l.head[i]); 1163 } 1164 int acountIdx = beginAttrs(); 1165 int acount = 0; 1166 1167 if (code.lineInfo.nonEmpty()) { 1168 int alenIdx = writeAttr(names.LineNumberTable); 1169 databuf.appendChar(code.lineInfo.length()); 1170 for (List<char[]> l = code.lineInfo.reverse(); 1171 l.nonEmpty(); 1172 l = l.tail) 1173 for (int i = 0; i < l.head.length; i++) 1174 databuf.appendChar(l.head[i]); 1175 endAttr(alenIdx); 1176 acount++; 1177 } 1178 1179 if (genCrt && (code.crt != null)) { 1180 CRTable crt = code.crt; 1181 int alenIdx = writeAttr(names.CharacterRangeTable); 1182 int crtIdx = beginAttrs(); 1183 int crtEntries = crt.writeCRT(databuf, code.lineMap, log); 1184 endAttrs(crtIdx, crtEntries); 1185 endAttr(alenIdx); 1186 acount++; 1187 } 1188 1189 // counter for number of generic local variables 1190 if (code.varDebugInfo && code.varBufferSize > 0) { 1191 int nGenericVars = 0; 1192 int alenIdx = writeAttr(names.LocalVariableTable); 1193 databuf.appendChar(code.getLVTSize()); 1194 for (int i=0; i<code.varBufferSize; i++) { 1195 Code.LocalVar var = code.varBuffer[i]; 1196 1197 for (Code.LocalVar.Range r: var.aliveRanges) { 1198 // write variable info 1199 Assert.check(r.start_pc >= 0 1200 && r.start_pc <= code.cp); 1201 databuf.appendChar(r.start_pc); 1202 Assert.check(r.length > 0 1203 && (r.start_pc + r.length) <= code.cp); 1204 databuf.appendChar(r.length); 1205 VarSymbol sym = var.sym; 1206 databuf.appendChar(pool.put(sym.name)); 1207 Type vartype = sym.erasure(types); 1208 databuf.appendChar(pool.put(typeSig(vartype))); 1209 databuf.appendChar(var.reg); 1210 if (needsLocalVariableTypeEntry(var.sym.type)) { 1211 nGenericVars++; 1212 } 1213 } 1214 } 1215 endAttr(alenIdx); 1216 acount++; 1217 1218 if (nGenericVars > 0) { 1219 alenIdx = writeAttr(names.LocalVariableTypeTable); 1220 databuf.appendChar(nGenericVars); 1221 int count = 0; 1222 1223 for (int i=0; i<code.varBufferSize; i++) { 1224 Code.LocalVar var = code.varBuffer[i]; 1225 VarSymbol sym = var.sym; 1226 if (!needsLocalVariableTypeEntry(sym.type)) 1227 continue; 1228 for (Code.LocalVar.Range r : var.aliveRanges) { 1229 // write variable info 1230 databuf.appendChar(r.start_pc); 1231 databuf.appendChar(r.length); 1232 databuf.appendChar(pool.put(sym.name)); 1233 databuf.appendChar(pool.put(typeSig(sym.type))); 1234 databuf.appendChar(var.reg); 1235 count++; 1236 } 1237 } 1238 Assert.check(count == nGenericVars); 1239 endAttr(alenIdx); 1240 acount++; 1241 } 1242 } 1243 1244 if (code.stackMapBufferSize > 0) { 1245 if (debugstackmap) System.out.println("Stack map for " + code.meth); 1246 int alenIdx = writeAttr(code.stackMap.getAttributeName(names)); 1247 writeStackMap(code); 1248 endAttr(alenIdx); 1249 acount++; 1250 } 1251 1252 acount += writeTypeAnnotations(code.meth.getRawTypeAttributes(), true); 1253 1254 endAttrs(acountIdx, acount); 1255 } 1256 //where 1257 private boolean needsLocalVariableTypeEntry(Type t) { 1258 //a local variable needs a type-entry if its type T is generic 1259 //(i.e. |T| != T) and if it's not an intersection type (not supported 1260 //in signature attribute grammar) 1261 return (!types.isSameType(t, types.erasure(t)) && 1262 !t.isCompound()); 1263 } 1264 1265 void writeStackMap(Code code) { 1266 int nframes = code.stackMapBufferSize; 1267 if (debugstackmap) System.out.println(" nframes = " + nframes); 1268 databuf.appendChar(nframes); 1269 1270 switch (code.stackMap) { 1271 case CLDC: 1272 for (int i=0; i<nframes; i++) { 1273 if (debugstackmap) System.out.print(" " + i + ":"); 1274 Code.StackMapFrame frame = code.stackMapBuffer[i]; 1275 1276 // output PC 1277 if (debugstackmap) System.out.print(" pc=" + frame.pc); 1278 databuf.appendChar(frame.pc); 1279 1280 // output locals 1281 int localCount = 0; 1282 for (int j=0; j<frame.locals.length; 1283 j += Code.width(frame.locals[j])) { 1284 localCount++; 1285 } 1286 if (debugstackmap) System.out.print(" nlocals=" + 1287 localCount); 1288 databuf.appendChar(localCount); 1289 for (int j=0; j<frame.locals.length; 1290 j += Code.width(frame.locals[j])) { 1291 if (debugstackmap) System.out.print(" local[" + j + "]="); 1292 writeStackMapType(frame.locals[j]); 1293 } 1294 1295 // output stack 1296 int stackCount = 0; 1297 for (int j=0; j<frame.stack.length; 1298 j += Code.width(frame.stack[j])) { 1299 stackCount++; 1300 } 1301 if (debugstackmap) System.out.print(" nstack=" + 1302 stackCount); 1303 databuf.appendChar(stackCount); 1304 for (int j=0; j<frame.stack.length; 1305 j += Code.width(frame.stack[j])) { 1306 if (debugstackmap) System.out.print(" stack[" + j + "]="); 1307 writeStackMapType(frame.stack[j]); 1308 } 1309 if (debugstackmap) System.out.println(); 1310 } 1311 break; 1312 case JSR202: { 1313 Assert.checkNull(code.stackMapBuffer); 1314 for (int i=0; i<nframes; i++) { 1315 if (debugstackmap) System.out.print(" " + i + ":"); 1316 StackMapTableFrame frame = code.stackMapTableBuffer[i]; 1317 frame.write(this); 1318 if (debugstackmap) System.out.println(); 1319 } 1320 break; 1321 } 1322 default: 1323 throw new AssertionError("Unexpected stackmap format value"); 1324 } 1325 } 1326 1327 //where 1328 void writeStackMapType(Type t) { 1329 if (t == null) { 1330 if (debugstackmap) System.out.print("empty"); 1331 databuf.appendByte(0); 1332 } 1333 else switch(t.getTag()) { 1334 case BYTE: 1335 case CHAR: 1336 case SHORT: 1337 case INT: 1338 case BOOLEAN: 1339 if (debugstackmap) System.out.print("int"); 1340 databuf.appendByte(1); 1341 break; 1342 case FLOAT: 1343 if (debugstackmap) System.out.print("float"); 1344 databuf.appendByte(2); 1345 break; 1346 case DOUBLE: 1347 if (debugstackmap) System.out.print("double"); 1348 databuf.appendByte(3); 1349 break; 1350 case LONG: 1351 if (debugstackmap) System.out.print("long"); 1352 databuf.appendByte(4); 1353 break; 1354 case BOT: // null 1355 if (debugstackmap) System.out.print("null"); 1356 databuf.appendByte(5); 1357 break; 1358 case CLASS: 1359 case ARRAY: 1360 if (debugstackmap) System.out.print("object(" + t + ")"); 1361 databuf.appendByte(7); 1362 databuf.appendChar(pool.put(t)); 1363 break; 1364 case TYPEVAR: 1365 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")"); 1366 databuf.appendByte(7); 1367 databuf.appendChar(pool.put(types.erasure(t).tsym)); 1368 break; 1369 case UNINITIALIZED_THIS: 1370 if (debugstackmap) System.out.print("uninit_this"); 1371 databuf.appendByte(6); 1372 break; 1373 case UNINITIALIZED_OBJECT: 1374 { UninitializedType uninitType = (UninitializedType)t; 1375 databuf.appendByte(8); 1376 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset); 1377 databuf.appendChar(uninitType.offset); 1378 } 1379 break; 1380 default: 1381 throw new AssertionError(); 1382 } 1383 } 1384 1385 /** An entry in the JSR202 StackMapTable */ 1386 abstract static class StackMapTableFrame { 1387 abstract int getFrameType(); 1388 1389 void write(ClassWriter writer) { 1390 int frameType = getFrameType(); 1391 writer.databuf.appendByte(frameType); 1392 if (writer.debugstackmap) System.out.print(" frame_type=" + frameType); 1393 } 1394 1395 static class SameFrame extends StackMapTableFrame { 1396 final int offsetDelta; 1397 SameFrame(int offsetDelta) { 1398 this.offsetDelta = offsetDelta; 1399 } 1400 int getFrameType() { 1401 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED; 1402 } 1403 @Override 1404 void write(ClassWriter writer) { 1405 super.write(writer); 1406 if (getFrameType() == SAME_FRAME_EXTENDED) { 1407 writer.databuf.appendChar(offsetDelta); 1408 if (writer.debugstackmap){ 1409 System.out.print(" offset_delta=" + offsetDelta); 1410 } 1411 } 1412 } 1413 } 1414 1415 static class SameLocals1StackItemFrame extends StackMapTableFrame { 1416 final int offsetDelta; 1417 final Type stack; 1418 SameLocals1StackItemFrame(int offsetDelta, Type stack) { 1419 this.offsetDelta = offsetDelta; 1420 this.stack = stack; 1421 } 1422 int getFrameType() { 1423 return (offsetDelta < SAME_FRAME_SIZE) ? 1424 (SAME_FRAME_SIZE + offsetDelta) : 1425 SAME_LOCALS_1_STACK_ITEM_EXTENDED; 1426 } 1427 @Override 1428 void write(ClassWriter writer) { 1429 super.write(writer); 1430 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) { 1431 writer.databuf.appendChar(offsetDelta); 1432 if (writer.debugstackmap) { 1433 System.out.print(" offset_delta=" + offsetDelta); 1434 } 1435 } 1436 if (writer.debugstackmap) { 1437 System.out.print(" stack[" + 0 + "]="); 1438 } 1439 writer.writeStackMapType(stack); 1440 } 1441 } 1442 1443 static class ChopFrame extends StackMapTableFrame { 1444 final int frameType; 1445 final int offsetDelta; 1446 ChopFrame(int frameType, int offsetDelta) { 1447 this.frameType = frameType; 1448 this.offsetDelta = offsetDelta; 1449 } 1450 int getFrameType() { return frameType; } 1451 @Override 1452 void write(ClassWriter writer) { 1453 super.write(writer); 1454 writer.databuf.appendChar(offsetDelta); 1455 if (writer.debugstackmap) { 1456 System.out.print(" offset_delta=" + offsetDelta); 1457 } 1458 } 1459 } 1460 1461 static class AppendFrame extends StackMapTableFrame { 1462 final int frameType; 1463 final int offsetDelta; 1464 final Type[] locals; 1465 AppendFrame(int frameType, int offsetDelta, Type[] locals) { 1466 this.frameType = frameType; 1467 this.offsetDelta = offsetDelta; 1468 this.locals = locals; 1469 } 1470 int getFrameType() { return frameType; } 1471 @Override 1472 void write(ClassWriter writer) { 1473 super.write(writer); 1474 writer.databuf.appendChar(offsetDelta); 1475 if (writer.debugstackmap) { 1476 System.out.print(" offset_delta=" + offsetDelta); 1477 } 1478 for (int i=0; i<locals.length; i++) { 1479 if (writer.debugstackmap) System.out.print(" locals[" + i + "]="); 1480 writer.writeStackMapType(locals[i]); 1481 } 1482 } 1483 } 1484 1485 static class FullFrame extends StackMapTableFrame { 1486 final int offsetDelta; 1487 final Type[] locals; 1488 final Type[] stack; 1489 FullFrame(int offsetDelta, Type[] locals, Type[] stack) { 1490 this.offsetDelta = offsetDelta; 1491 this.locals = locals; 1492 this.stack = stack; 1493 } 1494 int getFrameType() { return FULL_FRAME; } 1495 @Override 1496 void write(ClassWriter writer) { 1497 super.write(writer); 1498 writer.databuf.appendChar(offsetDelta); 1499 writer.databuf.appendChar(locals.length); 1500 if (writer.debugstackmap) { 1501 System.out.print(" offset_delta=" + offsetDelta); 1502 System.out.print(" nlocals=" + locals.length); 1503 } 1504 for (int i=0; i<locals.length; i++) { 1505 if (writer.debugstackmap) System.out.print(" locals[" + i + "]="); 1506 writer.writeStackMapType(locals[i]); 1507 } 1508 1509 writer.databuf.appendChar(stack.length); 1510 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); } 1511 for (int i=0; i<stack.length; i++) { 1512 if (writer.debugstackmap) System.out.print(" stack[" + i + "]="); 1513 writer.writeStackMapType(stack[i]); 1514 } 1515 } 1516 } 1517 1518 /** Compare this frame with the previous frame and produce 1519 * an entry of compressed stack map frame. */ 1520 static StackMapTableFrame getInstance(Code.StackMapFrame this_frame, 1521 int prev_pc, 1522 Type[] prev_locals, 1523 Types types) { 1524 Type[] locals = this_frame.locals; 1525 Type[] stack = this_frame.stack; 1526 int offset_delta = this_frame.pc - prev_pc - 1; 1527 if (stack.length == 1) { 1528 if (locals.length == prev_locals.length 1529 && compare(prev_locals, locals, types) == 0) { 1530 return new SameLocals1StackItemFrame(offset_delta, stack[0]); 1531 } 1532 } else if (stack.length == 0) { 1533 int diff_length = compare(prev_locals, locals, types); 1534 if (diff_length == 0) { 1535 return new SameFrame(offset_delta); 1536 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) { 1537 // APPEND 1538 Type[] local_diff = new Type[-diff_length]; 1539 for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) { 1540 local_diff[j] = locals[i]; 1541 } 1542 return new AppendFrame(SAME_FRAME_EXTENDED - diff_length, 1543 offset_delta, 1544 local_diff); 1545 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) { 1546 // CHOP 1547 return new ChopFrame(SAME_FRAME_EXTENDED - diff_length, 1548 offset_delta); 1549 } 1550 } 1551 // FULL_FRAME 1552 return new FullFrame(offset_delta, locals, stack); 1553 } 1554 1555 static boolean isInt(Type t) { 1556 return (t.getTag().isStrictSubRangeOf(INT) || t.hasTag(BOOLEAN)); 1557 } 1558 1559 static boolean isSameType(Type t1, Type t2, Types types) { 1560 if (t1 == null) { return t2 == null; } 1561 if (t2 == null) { return false; } 1562 1563 if (isInt(t1) && isInt(t2)) { return true; } 1564 1565 if (t1.hasTag(UNINITIALIZED_THIS)) { 1566 return t2.hasTag(UNINITIALIZED_THIS); 1567 } else if (t1.hasTag(UNINITIALIZED_OBJECT)) { 1568 if (t2.hasTag(UNINITIALIZED_OBJECT)) { 1569 return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset; 1570 } else { 1571 return false; 1572 } 1573 } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) { 1574 return false; 1575 } 1576 1577 return types.isSameType(t1, t2); 1578 } 1579 1580 static int compare(Type[] arr1, Type[] arr2, Types types) { 1581 int diff_length = arr1.length - arr2.length; 1582 if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) { 1583 return Integer.MAX_VALUE; 1584 } 1585 int len = (diff_length > 0) ? arr2.length : arr1.length; 1586 for (int i=0; i<len; i++) { 1587 if (!isSameType(arr1[i], arr2[i], types)) { 1588 return Integer.MAX_VALUE; 1589 } 1590 } 1591 return diff_length; 1592 } 1593 } 1594 1595 void writeFields(Scope s) { 1596 // process them in reverse sibling order; 1597 // i.e., process them in declaration order. 1598 List<VarSymbol> vars = List.nil(); 1599 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) { 1600 if (sym.kind == VAR) vars = vars.prepend((VarSymbol)sym); 1601 } 1602 while (vars.nonEmpty()) { 1603 writeField(vars.head); 1604 vars = vars.tail; 1605 } 1606 } 1607 1608 void writeMethods(Scope s) { 1609 List<MethodSymbol> methods = List.nil(); 1610 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) { 1611 if (sym.kind == MTH && (sym.flags() & HYPOTHETICAL) == 0) 1612 methods = methods.prepend((MethodSymbol)sym); 1613 } 1614 while (methods.nonEmpty()) { 1615 writeMethod(methods.head); 1616 methods = methods.tail; 1617 } 1618 } 1619 1620 /** Emit a class file for a given class. 1621 * @param c The class from which a class file is generated. 1622 */ 1623 public JavaFileObject writeClass(ClassSymbol c) 1624 throws IOException, PoolOverflow, StringOverflow 1625 { 1626 String name = (c.owner.kind == MDL ? c.name : c.flatname).toString(); 1627 Location outLocn; 1628 if (multiModuleMode) { 1629 ModuleSymbol msym = c.owner.kind == MDL ? (ModuleSymbol) c.owner : c.packge().modle; 1630 outLocn = fileManager.getModuleLocation(CLASS_OUTPUT, msym.name.toString()); 1631 } else { 1632 outLocn = CLASS_OUTPUT; 1633 } 1634 JavaFileObject outFile 1635 = fileManager.getJavaFileForOutput(outLocn, 1636 name, 1637 JavaFileObject.Kind.CLASS, 1638 c.sourcefile); 1639 OutputStream out = outFile.openOutputStream(); 1640 try { 1641 writeClassFile(out, c); 1642 if (verbose) 1643 log.printVerbose("wrote.file", outFile); 1644 out.close(); 1645 out = null; 1646 } finally { 1647 if (out != null) { 1648 // if we are propagating an exception, delete the file 1649 out.close(); 1650 outFile.delete(); 1651 outFile = null; 1652 } 1653 } 1654 return outFile; // may be null if write failed 1655 } 1656 1657 /** Write class `c' to outstream `out'. 1658 */ 1659 public void writeClassFile(OutputStream out, ClassSymbol c) 1660 throws IOException, PoolOverflow, StringOverflow { 1661 Assert.check((c.flags() & COMPOUND) == 0); 1662 databuf.reset(); 1663 poolbuf.reset(); 1664 signatureGen.reset(); 1665 pool = c.pool; 1666 innerClasses = null; 1667 innerClassesQueue = null; 1668 bootstrapMethods = new LinkedHashMap<>(); 1669 1670 Type supertype = types.supertype(c.type); 1671 List<Type> interfaces = types.interfaces(c.type); 1672 List<Type> typarams = c.type.getTypeArguments(); 1673 1674 int flags; 1675 if (c.owner.kind == MDL) { 1676 flags = ACC_MODULE; 1677 } else { 1678 flags = adjustFlags(c.flags() & ~DEFAULT); 1679 if ((flags & PROTECTED) != 0) flags |= PUBLIC; 1680 flags = flags & ClassFlags & ~STRICTFP; 1681 if ((flags & INTERFACE) == 0) flags |= ACC_SUPER; 1682 if (c.isInner() && c.name.isEmpty()) flags &= ~FINAL; 1683 } 1684 1685 if (dumpClassModifiers) { 1686 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1687 pw.println(); 1688 pw.println("CLASSFILE " + c.getQualifiedName()); 1689 pw.println("---" + flagNames(flags)); 1690 } 1691 databuf.appendChar(flags); 1692 1693 databuf.appendChar(pool.put(c)); 1694 databuf.appendChar(supertype.hasTag(CLASS) ? pool.put(supertype.tsym) : 0); 1695 databuf.appendChar(interfaces.length()); 1696 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail) 1697 databuf.appendChar(pool.put(l.head.tsym)); 1698 int fieldsCount = 0; 1699 int methodsCount = 0; 1700 for (Symbol sym : c.members().getSymbols(NON_RECURSIVE)) { 1701 switch (sym.kind) { 1702 case VAR: fieldsCount++; break; 1703 case MTH: if ((sym.flags() & HYPOTHETICAL) == 0) methodsCount++; 1704 break; 1705 case TYP: enterInner((ClassSymbol)sym); break; 1706 default : Assert.error(); 1707 } 1708 } 1709 1710 if (c.trans_local != null) { 1711 for (ClassSymbol local : c.trans_local) { 1712 enterInner(local); 1713 } 1714 } 1715 1716 databuf.appendChar(fieldsCount); 1717 writeFields(c.members()); 1718 databuf.appendChar(methodsCount); 1719 writeMethods(c.members()); 1720 1721 int acountIdx = beginAttrs(); 1722 int acount = 0; 1723 1724 boolean sigReq = 1725 typarams.length() != 0 || supertype.allparams().length() != 0; 1726 for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail) 1727 sigReq = l.head.allparams().length() != 0; 1728 if (sigReq) { 1729 int alenIdx = writeAttr(names.Signature); 1730 if (typarams.length() != 0) signatureGen.assembleParamsSig(typarams); 1731 signatureGen.assembleSig(supertype); 1732 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail) 1733 signatureGen.assembleSig(l.head); 1734 databuf.appendChar(pool.put(signatureGen.toName())); 1735 signatureGen.reset(); 1736 endAttr(alenIdx); 1737 acount++; 1738 } 1739 1740 if (c.sourcefile != null && emitSourceFile) { 1741 int alenIdx = writeAttr(names.SourceFile); 1742 // WHM 6/29/1999: Strip file path prefix. We do it here at 1743 // the last possible moment because the sourcefile may be used 1744 // elsewhere in error diagnostics. Fixes 4241573. 1745 //databuf.appendChar(c.pool.put(c.sourcefile)); 1746 String simpleName = PathFileObject.getSimpleName(c.sourcefile); 1747 databuf.appendChar(c.pool.put(names.fromString(simpleName))); 1748 endAttr(alenIdx); 1749 acount++; 1750 } 1751 1752 if (genCrt) { 1753 // Append SourceID attribute 1754 int alenIdx = writeAttr(names.SourceID); 1755 databuf.appendChar(c.pool.put(names.fromString(Long.toString(getLastModified(c.sourcefile))))); 1756 endAttr(alenIdx); 1757 acount++; 1758 // Append CompilationID attribute 1759 alenIdx = writeAttr(names.CompilationID); 1760 databuf.appendChar(c.pool.put(names.fromString(Long.toString(System.currentTimeMillis())))); 1761 endAttr(alenIdx); 1762 acount++; 1763 } 1764 1765 acount += writeFlagAttrs(c.flags()); 1766 acount += writeJavaAnnotations(c.getRawAttributes()); 1767 acount += writeTypeAnnotations(c.getRawTypeAttributes(), false); 1768 acount += writeEnclosingMethodAttribute(c); 1769 if (c.owner.kind == MDL) { 1770 acount += writeModuleAttribute(c); 1771 } 1772 acount += writeExtraClassAttributes(c); 1773 1774 poolbuf.appendInt(JAVA_MAGIC); 1775 poolbuf.appendChar(target.minorVersion); 1776 poolbuf.appendChar(target.majorVersion); 1777 1778 writePool(c.pool); 1779 1780 if (innerClasses != null) { 1781 writeInnerClasses(); 1782 acount++; 1783 } 1784 1785 if (!bootstrapMethods.isEmpty()) { 1786 writeBootstrapMethods(); 1787 acount++; 1788 } 1789 1790 endAttrs(acountIdx, acount); 1791 1792 poolbuf.appendBytes(databuf.elems, 0, databuf.length); 1793 out.write(poolbuf.elems, 0, poolbuf.length); 1794 1795 pool = c.pool = null; // to conserve space 1796 } 1797 1798 /**Allows subclasses to write additional class attributes 1799 * 1800 * @return the number of attributes written 1801 */ 1802 protected int writeExtraClassAttributes(ClassSymbol c) { 1803 return 0; 1804 } 1805 1806 int adjustFlags(final long flags) { 1807 int result = (int)flags; 1808 1809 if ((flags & BRIDGE) != 0) 1810 result |= ACC_BRIDGE; 1811 if ((flags & VARARGS) != 0) 1812 result |= ACC_VARARGS; 1813 if ((flags & DEFAULT) != 0) 1814 result &= ~ABSTRACT; 1815 return result; 1816 } 1817 1818 long getLastModified(FileObject filename) { 1819 long mod = 0; 1820 try { 1821 mod = filename.getLastModified(); 1822 } catch (SecurityException e) { 1823 throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage()); 1824 } 1825 return mod; 1826 } 1827} 1828