1 /* 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.tools.javac.jvm; 27 28 import java.io.*; 29 import java.util.LinkedHashMap; 30 import java.util.Map; 31 import java.util.Set; 32 import java.util.HashSet; 33 34 import javax.tools.JavaFileManager; 35 import javax.tools.FileObject; 36 import javax.tools.JavaFileObject; 37 38 import com.sun.tools.javac.code.*; 39 import com.sun.tools.javac.code.Attribute.RetentionPolicy; 40 import com.sun.tools.javac.code.Symbol.*; 41 import com.sun.tools.javac.code.Type.*; 42 import com.sun.tools.javac.code.Types.UniqueType; 43 import com.sun.tools.javac.file.BaseFileObject; 44 import com.sun.tools.javac.jvm.Pool.DynamicMethod; 45 import com.sun.tools.javac.jvm.Pool.Method; 46 import com.sun.tools.javac.jvm.Pool.MethodHandle; 47 import com.sun.tools.javac.jvm.Pool.Variable; 48 import com.sun.tools.javac.util.*; 49 50 import static com.sun.tools.javac.code.Flags.*; 51 import static com.sun.tools.javac.code.Kinds.*; 52 import static com.sun.tools.javac.code.TypeTag.*; 53 import static com.sun.tools.javac.jvm.UninitializedType.*; 54 import static com.sun.tools.javac.main.Option.*; 55 import static javax.tools.StandardLocation.CLASS_OUTPUT; 56 57 /** This class provides operations to map an internal symbol table graph 58 * rooted in a ClassSymbol into a classfile. 59 * 60 * <p><b>This is NOT part of any supported API. 61 * If you write code that depends on this, you do so at your own risk. 62 * This code and its internal interfaces are subject to change or 63 * deletion without notice.</b> 64 */ 65 public class ClassWriter extends ClassFile { 66 protected static final Context.Key<ClassWriter> classWriterKey = 67 new Context.Key<ClassWriter>(); 68 69 private final Options options; 70 71 /** Switch: verbose output. 72 */ 73 private boolean verbose; 74 75 /** Switch: scramble private field names. 76 */ 77 private boolean scramble; 78 79 /** Switch: scramble all field names. 80 */ 81 private boolean scrambleAll; 82 83 /** Switch: retrofit mode. 84 */ 85 private boolean retrofit; 86 87 /** Switch: emit source file attribute. 88 */ 89 private boolean emitSourceFile; 90 91 /** Switch: generate CharacterRangeTable attribute. 92 */ 93 private boolean genCrt; 94 95 /** Switch: describe the generated stackmap. 96 */ 97 boolean debugstackmap; 98 99 /** 100 * Target class version. 101 */ 102 private Target target; 103 104 /** 105 * Source language version. 106 */ 107 private Source source; 108 109 /** Type utilities. */ 110 private Types types; 111 112 /** The initial sizes of the data and constant pool buffers. 113 * Sizes are increased when buffers get full. 114 */ 115 static final int DATA_BUF_SIZE = 0x0fff0; 116 static final int POOL_BUF_SIZE = 0x1fff0; 117 118 /** An output buffer for member info. 119 */ 120 ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE); 121 122 /** An output buffer for the constant pool. 123 */ 124 ByteBuffer poolbuf = new ByteBuffer(POOL_BUF_SIZE); 125 126 /** The constant pool. 127 */ 128 Pool pool; 129 130 /** The inner classes to be written, as a set. 131 */ 132 Set<ClassSymbol> innerClasses; 133 134 /** The inner classes to be written, as a queue where 135 * enclosing classes come first. 136 */ 137 ListBuffer<ClassSymbol> innerClassesQueue; 138 139 /** The bootstrap methods to be written in the corresponding class attribute 140 * (one for each invokedynamic) 141 */ 142 Map<DynamicMethod, MethodHandle> bootstrapMethods; 143 144 /** The log to use for verbose output. 145 */ 146 private final Log log; 147 148 /** The name table. */ 149 private final Names names; 150 151 /** Access to files. */ 152 private final JavaFileManager fileManager; 153 154 /** Sole signature generator */ 155 private final CWSignatureGenerator signatureGen; 156 157 /** The tags and constants used in compressed stackmap. */ 158 static final int SAME_FRAME_SIZE = 64; 159 static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247; 160 static final int SAME_FRAME_EXTENDED = 251; 161 static final int FULL_FRAME = 255; 162 static final int MAX_LOCAL_LENGTH_DIFF = 4; 163 164 /** Get the ClassWriter instance for this context. */ 165 public static ClassWriter instance(Context context) { 166 ClassWriter instance = context.get(classWriterKey); 167 if (instance == null) 168 instance = new ClassWriter(context); 169 return instance; 170 } 171 172 /** Construct a class writer, given an options table. 173 */ 174 protected ClassWriter(Context context) { 175 context.put(classWriterKey, this); 176 177 log = Log.instance(context); 178 names = Names.instance(context); 179 options = Options.instance(context); 180 target = Target.instance(context); 181 source = Source.instance(context); 182 types = Types.instance(context); 183 fileManager = context.get(JavaFileManager.class); 184 signatureGen = new CWSignatureGenerator(types); 185 186 verbose = options.isSet(VERBOSE); 187 scramble = options.isSet("-scramble"); 188 scrambleAll = options.isSet("-scrambleAll"); 189 retrofit = options.isSet("-retrofit"); 190 genCrt = options.isSet(XJCOV); 191 debugstackmap = options.isSet("debugstackmap"); 192 193 emitSourceFile = options.isUnset(G_CUSTOM) || 194 options.isSet(G_CUSTOM, "source"); 195 196 String dumpModFlags = options.get("dumpmodifiers"); 197 dumpClassModifiers = 198 (dumpModFlags != null && dumpModFlags.indexOf('c') != -1); 199 dumpFieldModifiers = 200 (dumpModFlags != null && dumpModFlags.indexOf('f') != -1); 201 dumpInnerClassModifiers = 202 (dumpModFlags != null && dumpModFlags.indexOf('i') != -1); 203 dumpMethodModifiers = 204 (dumpModFlags != null && dumpModFlags.indexOf('m') != -1); 205 } 206 207 /****************************************************************** 208 * Diagnostics: dump generated class names and modifiers 209 ******************************************************************/ 210 211 /** Value of option 'dumpmodifiers' is a string 212 * indicating which modifiers should be dumped for debugging: 213 * 'c' -- classes 214 * 'f' -- fields 215 * 'i' -- innerclass attributes 216 * 'm' -- methods 217 * For example, to dump everything: 218 * javac -XDdumpmodifiers=cifm MyProg.java 219 */ 220 private final boolean dumpClassModifiers; // -XDdumpmodifiers=c 221 private final boolean dumpFieldModifiers; // -XDdumpmodifiers=f 222 private final boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i 223 private final boolean dumpMethodModifiers; // -XDdumpmodifiers=m 224 225 226 /** Return flags as a string, separated by " ". 227 */ 228 public static String flagNames(long flags) { 229 StringBuilder sbuf = new StringBuilder(); 230 int i = 0; 231 long f = flags & StandardFlags; 232 while (f != 0) { 233 if ((f & 1) != 0) { 234 sbuf.append(" "); 235 sbuf.append(flagName[i]); 236 } 237 f = f >> 1; 238 i++; 239 } 240 return sbuf.toString(); 241 } 242 //where 243 private final static String[] flagName = { 244 "PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL", 245 "SUPER", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE", 246 "ABSTRACT", "STRICTFP"}; 247 248 /****************************************************************** 249 * Output routines 250 ******************************************************************/ 251 252 /** Write a character into given byte buffer; 253 * byte buffer will not be grown. 254 */ 255 void putChar(ByteBuffer buf, int op, int x) { 256 buf.elems[op ] = (byte)((x >> 8) & 0xFF); 257 buf.elems[op+1] = (byte)((x ) & 0xFF); 258 } 259 260 /** Write an integer into given byte buffer; 261 * byte buffer will not be grown. 262 */ 263 void putInt(ByteBuffer buf, int adr, int x) { 264 buf.elems[adr ] = (byte)((x >> 24) & 0xFF); 265 buf.elems[adr+1] = (byte)((x >> 16) & 0xFF); 266 buf.elems[adr+2] = (byte)((x >> 8) & 0xFF); 267 buf.elems[adr+3] = (byte)((x ) & 0xFF); 268 } 269 270 /** 271 * Signature Generation 272 */ 273 private class CWSignatureGenerator extends Types.SignatureGenerator { 274 275 /** 276 * An output buffer for type signatures. 277 */ 278 ByteBuffer sigbuf = new ByteBuffer(); 279 280 CWSignatureGenerator(Types types) { 281 super(types); 282 } 283 284 /** 285 * Assemble signature of given type in string buffer. 286 * Check for uninitialized types before calling the general case. 287 */ 288 @Override 289 public void assembleSig(Type type) { 290 type = type.unannotatedType(); 291 switch (type.getTag()) { 292 case UNINITIALIZED_THIS: 293 case UNINITIALIZED_OBJECT: 294 // we don't yet have a spec for uninitialized types in the 295 // local variable table 296 assembleSig(types.erasure(((UninitializedType)type).qtype)); 297 break; 298 default: 299 super.assembleSig(type); 300 } 301 } 302 303 @Override 304 protected void append(char ch) { 305 sigbuf.appendByte(ch); 306 } 307 308 @Override 309 protected void append(byte[] ba) { 310 sigbuf.appendBytes(ba); 311 } 312 313 @Override 314 protected void append(Name name) { 315 sigbuf.appendName(name); 316 } 317 318 @Override 319 protected void classReference(ClassSymbol c) { 320 enterInner(c); 321 } 322 323 private void reset() { 324 sigbuf.reset(); 325 } 326 327 private Name toName() { 328 return sigbuf.toName(names); 329 } 330 331 private boolean isEmpty() { 332 return sigbuf.length == 0; 333 } 334 } 335 336 /** 337 * Return signature of given type 338 */ 339 Name typeSig(Type type) { 340 Assert.check(signatureGen.isEmpty()); 341 //- System.out.println(" ? " + type); 342 signatureGen.assembleSig(type); 343 Name n = signatureGen.toName(); 344 signatureGen.reset(); 345 //- System.out.println(" " + n); 346 return n; 347 } 348 349 /** Given a type t, return the extended class name of its erasure in 350 * external representation. 351 */ 352 public Name xClassName(Type t) { 353 if (t.hasTag(CLASS)) { 354 return names.fromUtf(externalize(t.tsym.flatName())); 355 } else if (t.hasTag(ARRAY)) { 356 return typeSig(types.erasure(t)); 357 } else { 358 throw new AssertionError("xClassName"); 359 } 360 } 361 362 /****************************************************************** 363 * Writing the Constant Pool 364 ******************************************************************/ 365 366 /** Thrown when the constant pool is over full. 367 */ 368 public static class PoolOverflow extends Exception { 369 private static final long serialVersionUID = 0; 370 public PoolOverflow() {} 371 } 372 public static class StringOverflow extends Exception { 373 private static final long serialVersionUID = 0; 374 public final String value; 375 public StringOverflow(String s) { 376 value = s; 377 } 378 } 379 380 /** Write constant pool to pool buffer. 381 * Note: during writing, constant pool 382 * might grow since some parts of constants still need to be entered. 383 */ 384 void writePool(Pool pool) throws PoolOverflow, StringOverflow { 385 int poolCountIdx = poolbuf.length; 386 poolbuf.appendChar(0); 387 int i = 1; 388 while (i < pool.pp) { 389 Object value = pool.pool[i]; 390 Assert.checkNonNull(value); 391 if (value instanceof Method || value instanceof Variable) 392 value = ((DelegatedSymbol)value).getUnderlyingSymbol(); 393 394 if (value instanceof MethodSymbol) { 395 MethodSymbol m = (MethodSymbol)value; 396 if (!m.isDynamic()) { 397 poolbuf.appendByte((m.owner.flags() & INTERFACE) != 0 398 ? CONSTANT_InterfaceMethodref 399 : CONSTANT_Methodref); 400 poolbuf.appendChar(pool.put(m.owner)); 401 poolbuf.appendChar(pool.put(nameType(m))); 402 } else { 403 //invokedynamic 404 DynamicMethodSymbol dynSym = (DynamicMethodSymbol)m; 405 MethodHandle handle = new MethodHandle(dynSym.bsmKind, dynSym.bsm, types); 406 DynamicMethod dynMeth = new DynamicMethod(dynSym, types); 407 bootstrapMethods.put(dynMeth, handle); 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(bootstrapMethods.size() - 1); 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 instanceof MethodType) { 465 poolbuf.appendByte(CONSTANT_MethodType); 466 poolbuf.appendChar(pool.put(typeSig((MethodType)type))); 467 } else { 468 if (type.hasTag(CLASS)) enterInner((ClassSymbol)type.tsym); 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 field, return its name. 488 */ 489 Name fieldName(Symbol sym) { 490 if (scramble && (sym.flags() & PRIVATE) != 0 || 491 scrambleAll && (sym.flags() & (PROTECTED | PUBLIC)) == 0) 492 return names.fromString("_$" + sym.name.getIndex()); 493 else 494 return sym.name; 495 } 496 497 /** Given a symbol, return its name-and-type. 498 */ 499 NameAndType nameType(Symbol sym) { 500 return new NameAndType(fieldName(sym), 501 retrofit 502 ? sym.erasure(types) 503 : sym.externalType(types), types); 504 // if we retrofit, then the NameAndType has been read in as is 505 // and no change is necessary. If we compile normally, the 506 // NameAndType is generated from a symbol reference, and the 507 // adjustment of adding an additional this$n parameter needs to be made. 508 } 509 510 /****************************************************************** 511 * Writing Attributes 512 ******************************************************************/ 513 514 /** Write header for an attribute to data buffer and return 515 * position past attribute length index. 516 */ 517 int writeAttr(Name attrName) { 518 databuf.appendChar(pool.put(attrName)); 519 databuf.appendInt(0); 520 return databuf.length; 521 } 522 523 /** Fill in attribute length. 524 */ 525 void endAttr(int index) { 526 putInt(databuf, index - 4, databuf.length - index); 527 } 528 529 /** Leave space for attribute count and return index for 530 * number of attributes field. 531 */ 532 int beginAttrs() { 533 databuf.appendChar(0); 534 return databuf.length; 535 } 536 537 /** Fill in number of attributes. 538 */ 539 void endAttrs(int index, int count) { 540 putChar(databuf, index - 2, count); 541 } 542 543 /** Write the EnclosingMethod attribute if needed. 544 * Returns the number of attributes written (0 or 1). 545 */ 546 int writeEnclosingMethodAttribute(ClassSymbol c) { 547 if (!target.hasEnclosingMethodAttribute()) 548 return 0; 549 return writeEnclosingMethodAttribute(names.EnclosingMethod, c); 550 } 551 552 /** Write the EnclosingMethod attribute with a specified name. 553 * Returns the number of attributes written (0 or 1). 554 */ 555 protected int writeEnclosingMethodAttribute(Name attributeName, ClassSymbol c) { 556 if (c.owner.kind != MTH && // neither a local class 557 c.name != names.empty) // nor anonymous 558 return 0; 559 560 int alenIdx = writeAttr(attributeName); 561 ClassSymbol enclClass = c.owner.enclClass(); 562 MethodSymbol enclMethod = 563 (c.owner.type == null // local to init block 564 || c.owner.kind != MTH) // or member init 565 ? null 566 : (MethodSymbol)c.owner; 567 databuf.appendChar(pool.put(enclClass)); 568 databuf.appendChar(enclMethod == null ? 0 : pool.put(nameType(c.owner))); 569 endAttr(alenIdx); 570 return 1; 571 } 572 573 /** Write flag attributes; return number of attributes written. 574 */ 575 int writeFlagAttrs(long flags) { 576 int acount = 0; 577 if ((flags & DEPRECATED) != 0) { 578 int alenIdx = writeAttr(names.Deprecated); 579 endAttr(alenIdx); 580 acount++; 581 } 582 if ((flags & ENUM) != 0 && !target.useEnumFlag()) { 583 int alenIdx = writeAttr(names.Enum); 584 endAttr(alenIdx); 585 acount++; 586 } 587 if ((flags & SYNTHETIC) != 0 && !target.useSyntheticFlag()) { 588 int alenIdx = writeAttr(names.Synthetic); 589 endAttr(alenIdx); 590 acount++; 591 } 592 if ((flags & BRIDGE) != 0 && !target.useBridgeFlag()) { 593 int alenIdx = writeAttr(names.Bridge); 594 endAttr(alenIdx); 595 acount++; 596 } 597 if ((flags & VARARGS) != 0 && !target.useVarargsFlag()) { 598 int alenIdx = writeAttr(names.Varargs); 599 endAttr(alenIdx); 600 acount++; 601 } 602 if ((flags & ANNOTATION) != 0 && !target.useAnnotationFlag()) { 603 int alenIdx = writeAttr(names.Annotation); 604 endAttr(alenIdx); 605 acount++; 606 } 607 return acount; 608 } 609 610 /** Write member (field or method) attributes; 611 * return number of attributes written. 612 */ 613 int writeMemberAttrs(Symbol sym) { 614 int acount = writeFlagAttrs(sym.flags()); 615 long flags = sym.flags(); 616 if (source.allowGenerics() && 617 (flags & (SYNTHETIC|BRIDGE)) != SYNTHETIC && 618 (flags & ANONCONSTR) == 0 && 619 (!types.isSameType(sym.type, sym.erasure(types)) || 620 signatureGen.hasTypeVar(sym.type.getThrownTypes()))) { 621 // note that a local class with captured variables 622 // will get a signature attribute 623 int alenIdx = writeAttr(names.Signature); 624 databuf.appendChar(pool.put(typeSig(sym.type))); 625 endAttr(alenIdx); 626 acount++; 627 } 628 acount += writeJavaAnnotations(sym.getRawAttributes()); 629 acount += writeTypeAnnotations(sym.getRawTypeAttributes(), false); 630 return acount; 631 } 632 633 /** 634 * Write method parameter names attribute. 635 */ 636 int writeMethodParametersAttr(MethodSymbol m) { 637 MethodType ty = m.externalType(types).asMethodType(); 638 final int allparams = ty.argtypes.size(); 639 if (m.params != null && allparams != 0) { 640 final int attrIndex = writeAttr(names.MethodParameters); 641 databuf.appendByte(allparams); 642 // Write extra parameters first 643 for (VarSymbol s : m.extraParams) { 644 final int flags = 645 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) | 646 ((int) m.flags() & SYNTHETIC); 647 databuf.appendChar(pool.put(s.name)); 648 databuf.appendChar(flags); 649 } 650 // Now write the real parameters 651 for (VarSymbol s : m.params) { 652 final int flags = 653 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) | 654 ((int) m.flags() & SYNTHETIC); 655 databuf.appendChar(pool.put(s.name)); 656 databuf.appendChar(flags); 657 } 658 // Now write the captured locals 659 for (VarSymbol s : m.capturedLocals) { 660 final int flags = 661 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) | 662 ((int) m.flags() & SYNTHETIC); 663 databuf.appendChar(pool.put(s.name)); 664 databuf.appendChar(flags); 665 } 666 endAttr(attrIndex); 667 return 1; 668 } else 669 return 0; 670 } 671 672 673 private void writeParamAnnotations(List<VarSymbol> params, 674 RetentionPolicy retention) { 675 for (VarSymbol s : params) { 676 ListBuffer<Attribute.Compound> buf = new ListBuffer<>(); 677 for (Attribute.Compound a : s.getRawAttributes()) 678 if (types.getRetention(a) == retention) 679 buf.append(a); 680 databuf.appendChar(buf.length()); 681 for (Attribute.Compound a : buf) 682 writeCompoundAttribute(a); 683 } 684 685 } 686 687 private void writeParamAnnotations(MethodSymbol m, 688 RetentionPolicy retention) { 689 databuf.appendByte(m.params.length() + m.extraParams.length()); 690 writeParamAnnotations(m.extraParams, retention); 691 writeParamAnnotations(m.params, retention); 692 } 693 694 /** Write method parameter annotations; 695 * return number of attributes written. 696 */ 697 int writeParameterAttrs(MethodSymbol m) { 698 boolean hasVisible = false; 699 boolean hasInvisible = false; 700 if (m.params != null) { 701 for (VarSymbol s : m.params) { 702 for (Attribute.Compound a : s.getRawAttributes()) { 703 switch (types.getRetention(a)) { 704 case SOURCE: break; 705 case CLASS: hasInvisible = true; break; 706 case RUNTIME: hasVisible = true; break; 707 default: ;// /* fail soft */ throw new AssertionError(vis); 708 } 709 } 710 } 711 } 712 713 int attrCount = 0; 714 if (hasVisible) { 715 int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations); 716 writeParamAnnotations(m, RetentionPolicy.RUNTIME); 717 endAttr(attrIndex); 718 attrCount++; 719 } 720 if (hasInvisible) { 721 int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations); 722 writeParamAnnotations(m, RetentionPolicy.CLASS); 723 endAttr(attrIndex); 724 attrCount++; 725 } 726 return attrCount; 727 } 728 729 /********************************************************************** 730 * Writing Java-language annotations (aka metadata, attributes) 731 **********************************************************************/ 732 733 /** Write Java-language annotations; return number of JVM 734 * attributes written (zero or one). 735 */ 736 int writeJavaAnnotations(List<Attribute.Compound> attrs) { 737 if (attrs.isEmpty()) return 0; 738 ListBuffer<Attribute.Compound> visibles = new ListBuffer<Attribute.Compound>(); 739 ListBuffer<Attribute.Compound> invisibles = new ListBuffer<Attribute.Compound>(); 740 for (Attribute.Compound a : attrs) { 741 switch (types.getRetention(a)) { 742 case SOURCE: break; 743 case CLASS: invisibles.append(a); break; 744 case RUNTIME: visibles.append(a); break; 745 default: ;// /* fail soft */ throw new AssertionError(vis); 746 } 747 } 748 749 int attrCount = 0; 750 if (visibles.length() != 0) { 751 int attrIndex = writeAttr(names.RuntimeVisibleAnnotations); 752 databuf.appendChar(visibles.length()); 753 for (Attribute.Compound a : visibles) 754 writeCompoundAttribute(a); 755 endAttr(attrIndex); 756 attrCount++; 757 } 758 if (invisibles.length() != 0) { 759 int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations); 760 databuf.appendChar(invisibles.length()); 761 for (Attribute.Compound a : invisibles) 762 writeCompoundAttribute(a); 763 endAttr(attrIndex); 764 attrCount++; 765 } 766 return attrCount; 767 } 768 769 int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos, boolean inCode) { 770 if (typeAnnos.isEmpty()) return 0; 771 772 ListBuffer<Attribute.TypeCompound> visibles = new ListBuffer<>(); 773 ListBuffer<Attribute.TypeCompound> invisibles = new ListBuffer<>(); 774 775 for (Attribute.TypeCompound tc : typeAnnos) { 776 if (tc.hasUnknownPosition()) { 777 boolean fixed = tc.tryFixPosition(); 778 779 // Could we fix it? 780 if (!fixed) { 781 // This happens for nested types like @A Outer. @B Inner. 782 // For method parameters we get the annotation twice! Once with 783 // a valid position, once unknown. 784 // TODO: find a cleaner solution. 785 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 786 pw.println("ClassWriter: Position UNKNOWN in type annotation: " + tc); 787 continue; 788 } 789 } 790 791 if (tc.position.type.isLocal() != inCode) 792 continue; 793 if (!tc.position.emitToClassfile()) 794 continue; 795 switch (types.getRetention(tc)) { 796 case SOURCE: break; 797 case CLASS: invisibles.append(tc); break; 798 case RUNTIME: visibles.append(tc); break; 799 default: ;// /* fail soft */ throw new AssertionError(vis); 800 } 801 } 802 803 int attrCount = 0; 804 if (visibles.length() != 0) { 805 int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations); 806 databuf.appendChar(visibles.length()); 807 for (Attribute.TypeCompound p : visibles) 808 writeTypeAnnotation(p); 809 endAttr(attrIndex); 810 attrCount++; 811 } 812 813 if (invisibles.length() != 0) { 814 int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations); 815 databuf.appendChar(invisibles.length()); 816 for (Attribute.TypeCompound p : invisibles) 817 writeTypeAnnotation(p); 818 endAttr(attrIndex); 819 attrCount++; 820 } 821 822 return attrCount; 823 } 824 825 /** A visitor to write an attribute including its leading 826 * single-character marker. 827 */ 828 class AttributeWriter implements Attribute.Visitor { 829 public void visitConstant(Attribute.Constant _value) { 830 Object value = _value.value; 831 switch (_value.type.getTag()) { 832 case BYTE: 833 databuf.appendByte('B'); 834 break; 835 case CHAR: 836 databuf.appendByte('C'); 837 break; 838 case SHORT: 839 databuf.appendByte('S'); 840 break; 841 case INT: 842 databuf.appendByte('I'); 843 break; 844 case LONG: 845 databuf.appendByte('J'); 846 break; 847 case FLOAT: 848 databuf.appendByte('F'); 849 break; 850 case DOUBLE: 851 databuf.appendByte('D'); 852 break; 853 case BOOLEAN: 854 databuf.appendByte('Z'); 855 break; 856 case CLASS: 857 Assert.check(value instanceof String); 858 databuf.appendByte('s'); 859 value = names.fromString(value.toString()); // CONSTANT_Utf8 860 break; 861 default: 862 throw new AssertionError(_value.type); 863 } 864 databuf.appendChar(pool.put(value)); 865 } 866 public void visitEnum(Attribute.Enum e) { 867 databuf.appendByte('e'); 868 databuf.appendChar(pool.put(typeSig(e.value.type))); 869 databuf.appendChar(pool.put(e.value.name)); 870 } 871 public void visitClass(Attribute.Class clazz) { 872 databuf.appendByte('c'); 873 databuf.appendChar(pool.put(typeSig(clazz.classType))); 874 } 875 public void visitCompound(Attribute.Compound compound) { 876 databuf.appendByte('@'); 877 writeCompoundAttribute(compound); 878 } 879 public void visitError(Attribute.Error x) { 880 throw new AssertionError(x); 881 } 882 public void visitArray(Attribute.Array array) { 883 databuf.appendByte('['); 884 databuf.appendChar(array.values.length); 885 for (Attribute a : array.values) { 886 a.accept(this); 887 } 888 } 889 } 890 AttributeWriter awriter = new AttributeWriter(); 891 892 /** Write a compound attribute excluding the '@' marker. */ 893 void writeCompoundAttribute(Attribute.Compound c) { 894 databuf.appendChar(pool.put(typeSig(c.type))); 895 databuf.appendChar(c.values.length()); 896 for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) { 897 databuf.appendChar(pool.put(p.fst.name)); 898 p.snd.accept(awriter); 899 } 900 } 901 902 void writeTypeAnnotation(Attribute.TypeCompound c) { 903 writePosition(c.position); 904 writeCompoundAttribute(c); 905 } 906 907 void writePosition(TypeAnnotationPosition p) { 908 databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte 909 switch (p.type) { 910 // instanceof 911 case INSTANCEOF: 912 // new expression 913 case NEW: 914 // constructor/method reference receiver 915 case CONSTRUCTOR_REFERENCE: 916 case METHOD_REFERENCE: 917 databuf.appendChar(p.offset); 918 break; 919 // local variable 920 case LOCAL_VARIABLE: 921 // resource variable 922 case RESOURCE_VARIABLE: 923 databuf.appendChar(p.lvarOffset.length); // for table length 924 for (int i = 0; i < p.lvarOffset.length; ++i) { 925 databuf.appendChar(p.lvarOffset[i]); 926 databuf.appendChar(p.lvarLength[i]); 927 databuf.appendChar(p.lvarIndex[i]); 928 } 929 break; 930 // exception parameter 931 case EXCEPTION_PARAMETER: 932 databuf.appendChar(p.exception_index); 933 break; 934 // method receiver 935 case METHOD_RECEIVER: 936 // Do nothing 937 break; 938 // type parameter 939 case CLASS_TYPE_PARAMETER: 940 case METHOD_TYPE_PARAMETER: 941 databuf.appendByte(p.parameter_index); 942 break; 943 // type parameter bound 944 case CLASS_TYPE_PARAMETER_BOUND: 945 case METHOD_TYPE_PARAMETER_BOUND: 946 databuf.appendByte(p.parameter_index); 947 databuf.appendByte(p.bound_index); 948 break; 949 // class extends or implements clause 950 case CLASS_EXTENDS: 951 databuf.appendChar(p.type_index); 952 break; 953 // throws 954 case THROWS: 955 databuf.appendChar(p.type_index); 956 break; 957 // method parameter 958 case METHOD_FORMAL_PARAMETER: 959 databuf.appendByte(p.parameter_index); 960 break; 961 // type cast 962 case CAST: 963 // method/constructor/reference type argument 964 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT: 965 case METHOD_INVOCATION_TYPE_ARGUMENT: 966 case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT: 967 case METHOD_REFERENCE_TYPE_ARGUMENT: 968 databuf.appendChar(p.offset); 969 databuf.appendByte(p.type_index); 970 break; 971 // We don't need to worry about these 972 case METHOD_RETURN: 973 case FIELD: 974 break; 975 case UNKNOWN: 976 throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!"); 977 default: 978 throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p); 979 } 980 981 { // Append location data for generics/arrays. 982 databuf.appendByte(p.location.size()); 983 java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location); 984 for (int i : loc) 985 databuf.appendByte((byte)i); 986 } 987 } 988 989 /********************************************************************** 990 * Writing Objects 991 **********************************************************************/ 992 993 /** Enter an inner class into the `innerClasses' set/queue. 994 */ 995 void enterInner(ClassSymbol c) { 996 if (c.type.isCompound()) { 997 throw new AssertionError("Unexpected intersection type: " + c.type); 998 } 999 try { 1000 c.complete(); 1001 } catch (CompletionFailure ex) { 1002 System.err.println("error: " + c + ": " + ex.getMessage()); 1003 throw ex; 1004 } 1005 if (!c.type.hasTag(CLASS)) return; // arrays 1006 if (pool != null && // pool might be null if called from xClassName 1007 c.owner.enclClass() != null && 1008 (innerClasses == null || !innerClasses.contains(c))) { 1009 // log.errWriter.println("enter inner " + c);//DEBUG 1010 enterInner(c.owner.enclClass()); 1011 pool.put(c); 1012 if (c.name != names.empty) 1013 pool.put(c.name); 1014 if (innerClasses == null) { 1015 innerClasses = new HashSet<ClassSymbol>(); 1016 innerClassesQueue = new ListBuffer<ClassSymbol>(); 1017 pool.put(names.InnerClasses); 1018 } 1019 innerClasses.add(c); 1020 innerClassesQueue.append(c); 1021 } 1022 } 1023 1024 /** Write "inner classes" attribute. 1025 */ 1026 void writeInnerClasses() { 1027 int alenIdx = writeAttr(names.InnerClasses); 1028 databuf.appendChar(innerClassesQueue.length()); 1029 for (List<ClassSymbol> l = innerClassesQueue.toList(); 1030 l.nonEmpty(); 1031 l = l.tail) { 1032 ClassSymbol inner = l.head; 1033 char flags = (char) adjustFlags(inner.flags_field); 1034 if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT 1035 if (inner.name.isEmpty()) flags &= ~FINAL; // Anonymous class: unset FINAL flag 1036 flags &= ~STRICTFP; //inner classes should not have the strictfp flag set. 1037 if (dumpInnerClassModifiers) { 1038 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1039 pw.println("INNERCLASS " + inner.name); 1040 pw.println("---" + flagNames(flags)); 1041 } 1042 databuf.appendChar(pool.get(inner)); 1043 databuf.appendChar( 1044 inner.owner.kind == TYP && !inner.name.isEmpty() ? pool.get(inner.owner) : 0); 1045 databuf.appendChar( 1046 !inner.name.isEmpty() ? pool.get(inner.name) : 0); 1047 databuf.appendChar(flags); 1048 } 1049 endAttr(alenIdx); 1050 } 1051 1052 /** Write "bootstrapMethods" attribute. 1053 */ 1054 void writeBootstrapMethods() { 1055 int alenIdx = writeAttr(names.BootstrapMethods); 1056 databuf.appendChar(bootstrapMethods.size()); 1057 for (Map.Entry<DynamicMethod, MethodHandle> entry : bootstrapMethods.entrySet()) { 1058 DynamicMethod dmeth = entry.getKey(); 1059 DynamicMethodSymbol dsym = (DynamicMethodSymbol)dmeth.baseSymbol(); 1060 //write BSM handle 1061 databuf.appendChar(pool.get(entry.getValue())); 1062 //write static args length 1063 databuf.appendChar(dsym.staticArgs.length); 1064 //write static args array 1065 Object[] uniqueArgs = dmeth.uniqueStaticArgs; 1066 for (Object o : uniqueArgs) { 1067 databuf.appendChar(pool.get(o)); 1068 } 1069 } 1070 endAttr(alenIdx); 1071 } 1072 1073 /** Write field symbol, entering all references into constant pool. 1074 */ 1075 void writeField(VarSymbol v) { 1076 int flags = adjustFlags(v.flags()); 1077 databuf.appendChar(flags); 1078 if (dumpFieldModifiers) { 1079 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1080 pw.println("FIELD " + fieldName(v)); 1081 pw.println("---" + flagNames(v.flags())); 1082 } 1083 databuf.appendChar(pool.put(fieldName(v))); 1084 databuf.appendChar(pool.put(typeSig(v.erasure(types)))); 1085 int acountIdx = beginAttrs(); 1086 int acount = 0; 1087 if (v.getConstValue() != null) { 1088 int alenIdx = writeAttr(names.ConstantValue); 1089 databuf.appendChar(pool.put(v.getConstValue())); 1090 endAttr(alenIdx); 1091 acount++; 1092 } 1093 acount += writeMemberAttrs(v); 1094 endAttrs(acountIdx, acount); 1095 } 1096 1097 /** Write method symbol, entering all references into constant pool. 1098 */ 1099 void writeMethod(MethodSymbol m) { 1100 int flags = adjustFlags(m.flags()); 1101 databuf.appendChar(flags); 1102 if (dumpMethodModifiers) { 1103 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1104 pw.println("METHOD " + fieldName(m)); 1105 pw.println("---" + flagNames(m.flags())); 1106 } 1107 databuf.appendChar(pool.put(fieldName(m))); 1108 databuf.appendChar(pool.put(typeSig(m.externalType(types)))); 1109 int acountIdx = beginAttrs(); 1110 int acount = 0; 1111 if (m.code != null) { 1112 int alenIdx = writeAttr(names.Code); 1113 writeCode(m.code); 1114 m.code = null; // to conserve space 1115 endAttr(alenIdx); 1116 acount++; 1117 } 1118 List<Type> thrown = m.erasure(types).getThrownTypes(); 1119 if (thrown.nonEmpty()) { 1120 int alenIdx = writeAttr(names.Exceptions); 1121 databuf.appendChar(thrown.length()); 1122 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail) 1123 databuf.appendChar(pool.put(l.head.tsym)); 1124 endAttr(alenIdx); 1125 acount++; 1126 } 1127 if (m.defaultValue != null) { 1128 int alenIdx = writeAttr(names.AnnotationDefault); 1129 m.defaultValue.accept(awriter); 1130 endAttr(alenIdx); 1131 acount++; 1132 } 1133 if (options.isSet(PARAMETERS)) 1134 acount += writeMethodParametersAttr(m); 1135 acount += writeMemberAttrs(m); 1136 acount += writeParameterAttrs(m); 1137 endAttrs(acountIdx, acount); 1138 } 1139 1140 /** Write code attribute of method. 1141 */ 1142 void writeCode(Code code) { 1143 databuf.appendChar(code.max_stack); 1144 databuf.appendChar(code.max_locals); 1145 databuf.appendInt(code.cp); 1146 databuf.appendBytes(code.code, 0, code.cp); 1147 databuf.appendChar(code.catchInfo.length()); 1148 for (List<char[]> l = code.catchInfo.toList(); 1149 l.nonEmpty(); 1150 l = l.tail) { 1151 for (int i = 0; i < l.head.length; i++) 1152 databuf.appendChar(l.head[i]); 1153 } 1154 int acountIdx = beginAttrs(); 1155 int acount = 0; 1156 1157 if (code.lineInfo.nonEmpty()) { 1158 int alenIdx = writeAttr(names.LineNumberTable); 1159 databuf.appendChar(code.lineInfo.length()); 1160 for (List<char[]> l = code.lineInfo.reverse(); 1161 l.nonEmpty(); 1162 l = l.tail) 1163 for (int i = 0; i < l.head.length; i++) 1164 databuf.appendChar(l.head[i]); 1165 endAttr(alenIdx); 1166 acount++; 1167 } 1168 1169 if (genCrt && (code.crt != null)) { 1170 CRTable crt = code.crt; 1171 int alenIdx = writeAttr(names.CharacterRangeTable); 1172 int crtIdx = beginAttrs(); 1173 int crtEntries = crt.writeCRT(databuf, code.lineMap, log); 1174 endAttrs(crtIdx, crtEntries); 1175 endAttr(alenIdx); 1176 acount++; 1177 } 1178 1179 // counter for number of generic local variables 1180 if (code.varDebugInfo && code.varBufferSize > 0) { 1181 int nGenericVars = 0; 1182 int alenIdx = writeAttr(names.LocalVariableTable); 1183 databuf.appendChar(code.getLVTSize()); 1184 for (int i=0; i<code.varBufferSize; i++) { 1185 Code.LocalVar var = code.varBuffer[i]; 1186 1187 for (Code.LocalVar.Range r: var.aliveRanges) { 1188 // write variable info 1189 Assert.check(r.start_pc >= 0 1190 && r.start_pc <= code.cp); 1191 databuf.appendChar(r.start_pc); 1192 Assert.check(r.length >= 0 1193 && (r.start_pc + r.length) <= code.cp); 1194 databuf.appendChar(r.length); 1195 VarSymbol sym = var.sym; 1196 databuf.appendChar(pool.put(sym.name)); 1197 Type vartype = sym.erasure(types); 1198 databuf.appendChar(pool.put(typeSig(vartype))); 1199 databuf.appendChar(var.reg); 1200 if (needsLocalVariableTypeEntry(var.sym.type)) { 1201 nGenericVars++; 1202 } 1203 } 1204 } 1205 endAttr(alenIdx); 1206 acount++; 1207 1208 if (nGenericVars > 0) { 1209 alenIdx = writeAttr(names.LocalVariableTypeTable); 1210 databuf.appendChar(nGenericVars); 1211 int count = 0; 1212 1213 for (int i=0; i<code.varBufferSize; i++) { 1214 Code.LocalVar var = code.varBuffer[i]; 1215 VarSymbol sym = var.sym; 1216 if (!needsLocalVariableTypeEntry(sym.type)) 1217 continue; 1218 for (Code.LocalVar.Range r : var.aliveRanges) { 1219 // write variable info 1220 databuf.appendChar(r.start_pc); 1221 databuf.appendChar(r.length); 1222 databuf.appendChar(pool.put(sym.name)); 1223 databuf.appendChar(pool.put(typeSig(sym.type))); 1224 databuf.appendChar(var.reg); 1225 count++; 1226 } 1227 } 1228 Assert.check(count == nGenericVars); 1229 endAttr(alenIdx); 1230 acount++; 1231 } 1232 } 1233 1234 if (code.stackMapBufferSize > 0) { 1235 if (debugstackmap) System.out.println("Stack map for " + code.meth); 1236 int alenIdx = writeAttr(code.stackMap.getAttributeName(names)); 1237 writeStackMap(code); 1238 endAttr(alenIdx); 1239 acount++; 1240 } 1241 1242 acount += writeTypeAnnotations(code.meth.getRawTypeAttributes(), true); 1243 1244 endAttrs(acountIdx, acount); 1245 } 1246 //where 1247 private boolean needsLocalVariableTypeEntry(Type t) { 1248 //a local variable needs a type-entry if its type T is generic 1249 //(i.e. |T| != T) and if it's not an intersection type (not supported 1250 //in signature attribute grammar) 1251 return (!types.isSameType(t, types.erasure(t)) && 1252 !t.isCompound()); 1253 } 1254 1255 void writeStackMap(Code code) { 1256 int nframes = code.stackMapBufferSize; 1257 if (debugstackmap) System.out.println(" nframes = " + nframes); 1258 databuf.appendChar(nframes); 1259 1260 switch (code.stackMap) { 1261 case CLDC: 1262 for (int i=0; i<nframes; i++) { 1263 if (debugstackmap) System.out.print(" " + i + ":"); 1264 Code.StackMapFrame frame = code.stackMapBuffer[i]; 1265 1266 // output PC 1267 if (debugstackmap) System.out.print(" pc=" + frame.pc); 1268 databuf.appendChar(frame.pc); 1269 1270 // output locals 1271 int localCount = 0; 1272 for (int j=0; j<frame.locals.length; 1273 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.locals[j]))) { 1274 localCount++; 1275 } 1276 if (debugstackmap) System.out.print(" nlocals=" + 1277 localCount); 1278 databuf.appendChar(localCount); 1279 for (int j=0; j<frame.locals.length; 1280 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.locals[j]))) { 1281 if (debugstackmap) System.out.print(" local[" + j + "]="); 1282 writeStackMapType(frame.locals[j]); 1283 } 1284 1285 // output stack 1286 int stackCount = 0; 1287 for (int j=0; j<frame.stack.length; 1288 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.stack[j]))) { 1289 stackCount++; 1290 } 1291 if (debugstackmap) System.out.print(" nstack=" + 1292 stackCount); 1293 databuf.appendChar(stackCount); 1294 for (int j=0; j<frame.stack.length; 1295 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.stack[j]))) { 1296 if (debugstackmap) System.out.print(" stack[" + j + "]="); 1297 writeStackMapType(frame.stack[j]); 1298 } 1299 if (debugstackmap) System.out.println(); 1300 } 1301 break; 1302 case JSR202: { 1303 Assert.checkNull(code.stackMapBuffer); 1304 for (int i=0; i<nframes; i++) { 1305 if (debugstackmap) System.out.print(" " + i + ":"); 1306 StackMapTableFrame frame = code.stackMapTableBuffer[i]; 1307 frame.write(this); 1308 if (debugstackmap) System.out.println(); 1309 } 1310 break; 1311 } 1312 default: 1313 throw new AssertionError("Unexpected stackmap format value"); 1314 } 1315 } 1316 1317 //where 1318 void writeStackMapType(Type t) { 1319 if (t == null) { 1320 if (debugstackmap) System.out.print("empty"); 1321 databuf.appendByte(0); 1322 } 1323 else switch(t.getTag()) { 1324 case BYTE: 1325 case CHAR: 1326 case SHORT: 1327 case INT: 1328 case BOOLEAN: 1329 if (debugstackmap) System.out.print("int"); 1330 databuf.appendByte(1); 1331 break; 1332 case FLOAT: 1333 if (debugstackmap) System.out.print("float"); 1334 databuf.appendByte(2); 1335 break; 1336 case DOUBLE: 1337 if (debugstackmap) System.out.print("double"); 1338 databuf.appendByte(3); 1339 break; 1340 case LONG: 1341 if (debugstackmap) System.out.print("long"); 1342 databuf.appendByte(4); 1343 break; 1344 case BOT: // null 1345 if (debugstackmap) System.out.print("null"); 1346 databuf.appendByte(5); 1347 break; 1348 case CLASS: 1349 case ARRAY: 1350 if (debugstackmap) System.out.print("object(" + t + ")"); 1351 databuf.appendByte(7); 1352 databuf.appendChar(pool.put(t)); 1353 break; 1354 case TYPEVAR: 1355 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")"); 1356 databuf.appendByte(7); 1357 databuf.appendChar(pool.put(types.erasure(t).tsym)); 1358 break; 1359 case UNINITIALIZED_THIS: 1360 if (debugstackmap) System.out.print("uninit_this"); 1361 databuf.appendByte(6); 1362 break; 1363 case UNINITIALIZED_OBJECT: 1364 { UninitializedType uninitType = (UninitializedType)t; 1365 databuf.appendByte(8); 1366 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset); 1367 databuf.appendChar(uninitType.offset); 1368 } 1369 break; 1370 default: 1371 throw new AssertionError(); 1372 } 1373 } 1374 1375 /** An entry in the JSR202 StackMapTable */ 1376 abstract static class StackMapTableFrame { 1377 abstract int getFrameType(); 1378 1379 void write(ClassWriter writer) { 1380 int frameType = getFrameType(); 1381 writer.databuf.appendByte(frameType); 1382 if (writer.debugstackmap) System.out.print(" frame_type=" + frameType); 1383 } 1384 1385 static class SameFrame extends StackMapTableFrame { 1386 final int offsetDelta; 1387 SameFrame(int offsetDelta) { 1388 this.offsetDelta = offsetDelta; 1389 } 1390 int getFrameType() { 1391 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED; 1392 } 1393 @Override 1394 void write(ClassWriter writer) { 1395 super.write(writer); 1396 if (getFrameType() == SAME_FRAME_EXTENDED) { 1397 writer.databuf.appendChar(offsetDelta); 1398 if (writer.debugstackmap){ 1399 System.out.print(" offset_delta=" + offsetDelta); 1400 } 1401 } 1402 } 1403 } 1404 1405 static class SameLocals1StackItemFrame extends StackMapTableFrame { 1406 final int offsetDelta; 1407 final Type stack; 1408 SameLocals1StackItemFrame(int offsetDelta, Type stack) { 1409 this.offsetDelta = offsetDelta; 1410 this.stack = stack; 1411 } 1412 int getFrameType() { 1413 return (offsetDelta < SAME_FRAME_SIZE) ? 1414 (SAME_FRAME_SIZE + offsetDelta) : 1415 SAME_LOCALS_1_STACK_ITEM_EXTENDED; 1416 } 1417 @Override 1418 void write(ClassWriter writer) { 1419 super.write(writer); 1420 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) { 1421 writer.databuf.appendChar(offsetDelta); 1422 if (writer.debugstackmap) { 1423 System.out.print(" offset_delta=" + offsetDelta); 1424 } 1425 } 1426 if (writer.debugstackmap) { 1427 System.out.print(" stack[" + 0 + "]="); 1428 } 1429 writer.writeStackMapType(stack); 1430 } 1431 } 1432 1433 static class ChopFrame extends StackMapTableFrame { 1434 final int frameType; 1435 final int offsetDelta; 1436 ChopFrame(int frameType, int offsetDelta) { 1437 this.frameType = frameType; 1438 this.offsetDelta = offsetDelta; 1439 } 1440 int getFrameType() { return frameType; } 1441 @Override 1442 void write(ClassWriter writer) { 1443 super.write(writer); 1444 writer.databuf.appendChar(offsetDelta); 1445 if (writer.debugstackmap) { 1446 System.out.print(" offset_delta=" + offsetDelta); 1447 } 1448 } 1449 } 1450 1451 static class AppendFrame extends StackMapTableFrame { 1452 final int frameType; 1453 final int offsetDelta; 1454 final Type[] locals; 1455 AppendFrame(int frameType, int offsetDelta, Type[] locals) { 1456 this.frameType = frameType; 1457 this.offsetDelta = offsetDelta; 1458 this.locals = locals; 1459 } 1460 int getFrameType() { return frameType; } 1461 @Override 1462 void write(ClassWriter writer) { 1463 super.write(writer); 1464 writer.databuf.appendChar(offsetDelta); 1465 if (writer.debugstackmap) { 1466 System.out.print(" offset_delta=" + offsetDelta); 1467 } 1468 for (int i=0; i<locals.length; i++) { 1469 if (writer.debugstackmap) System.out.print(" locals[" + i + "]="); 1470 writer.writeStackMapType(locals[i]); 1471 } 1472 } 1473 } 1474 1475 static class FullFrame extends StackMapTableFrame { 1476 final int offsetDelta; 1477 final Type[] locals; 1478 final Type[] stack; 1479 FullFrame(int offsetDelta, Type[] locals, Type[] stack) { 1480 this.offsetDelta = offsetDelta; 1481 this.locals = locals; 1482 this.stack = stack; 1483 } 1484 int getFrameType() { return FULL_FRAME; } 1485 @Override 1486 void write(ClassWriter writer) { 1487 super.write(writer); 1488 writer.databuf.appendChar(offsetDelta); 1489 writer.databuf.appendChar(locals.length); 1490 if (writer.debugstackmap) { 1491 System.out.print(" offset_delta=" + offsetDelta); 1492 System.out.print(" nlocals=" + locals.length); 1493 } 1494 for (int i=0; i<locals.length; i++) { 1495 if (writer.debugstackmap) System.out.print(" locals[" + i + "]="); 1496 writer.writeStackMapType(locals[i]); 1497 } 1498 1499 writer.databuf.appendChar(stack.length); 1500 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); } 1501 for (int i=0; i<stack.length; i++) { 1502 if (writer.debugstackmap) System.out.print(" stack[" + i + "]="); 1503 writer.writeStackMapType(stack[i]); 1504 } 1505 } 1506 } 1507 1508 /** Compare this frame with the previous frame and produce 1509 * an entry of compressed stack map frame. */ 1510 static StackMapTableFrame getInstance(Code.StackMapFrame this_frame, 1511 int prev_pc, 1512 Type[] prev_locals, 1513 Types types) { 1514 Type[] locals = this_frame.locals; 1515 Type[] stack = this_frame.stack; 1516 int offset_delta = this_frame.pc - prev_pc - 1; 1517 if (stack.length == 1) { 1518 if (locals.length == prev_locals.length 1519 && compare(prev_locals, locals, types) == 0) { 1520 return new SameLocals1StackItemFrame(offset_delta, stack[0]); 1521 } 1522 } else if (stack.length == 0) { 1523 int diff_length = compare(prev_locals, locals, types); 1524 if (diff_length == 0) { 1525 return new SameFrame(offset_delta); 1526 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) { 1527 // APPEND 1528 Type[] local_diff = new Type[-diff_length]; 1529 for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) { 1530 local_diff[j] = locals[i]; 1531 } 1532 return new AppendFrame(SAME_FRAME_EXTENDED - diff_length, 1533 offset_delta, 1534 local_diff); 1535 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) { 1536 // CHOP 1537 return new ChopFrame(SAME_FRAME_EXTENDED - diff_length, 1538 offset_delta); 1539 } 1540 } 1541 // FULL_FRAME 1542 return new FullFrame(offset_delta, locals, stack); 1543 } 1544 1545 static boolean isInt(Type t) { 1546 return (t.getTag().isStrictSubRangeOf(INT) || t.hasTag(BOOLEAN)); 1547 } 1548 1549 static boolean isSameType(Type t1, Type t2, Types types) { 1550 if (t1 == null) { return t2 == null; } 1551 if (t2 == null) { return false; } 1552 1553 if (isInt(t1) && isInt(t2)) { return true; } 1554 1555 if (t1.hasTag(UNINITIALIZED_THIS)) { 1556 return t2.hasTag(UNINITIALIZED_THIS); 1557 } else if (t1.hasTag(UNINITIALIZED_OBJECT)) { 1558 if (t2.hasTag(UNINITIALIZED_OBJECT)) { 1559 return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset; 1560 } else { 1561 return false; 1562 } 1563 } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) { 1564 return false; 1565 } 1566 1567 return types.isSameType(t1, t2); 1568 } 1569 1570 static int compare(Type[] arr1, Type[] arr2, Types types) { 1571 int diff_length = arr1.length - arr2.length; 1572 if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) { 1573 return Integer.MAX_VALUE; 1574 } 1575 int len = (diff_length > 0) ? arr2.length : arr1.length; 1576 for (int i=0; i<len; i++) { 1577 if (!isSameType(arr1[i], arr2[i], types)) { 1578 return Integer.MAX_VALUE; 1579 } 1580 } 1581 return diff_length; 1582 } 1583 } 1584 1585 void writeFields(Scope.Entry e) { 1586 // process them in reverse sibling order; 1587 // i.e., process them in declaration order. 1588 List<VarSymbol> vars = List.nil(); 1589 for (Scope.Entry i = e; i != null; i = i.sibling) { 1590 if (i.sym.kind == VAR) vars = vars.prepend((VarSymbol)i.sym); 1591 } 1592 while (vars.nonEmpty()) { 1593 writeField(vars.head); 1594 vars = vars.tail; 1595 } 1596 } 1597 1598 void writeMethods(Scope.Entry e) { 1599 List<MethodSymbol> methods = List.nil(); 1600 for (Scope.Entry i = e; i != null; i = i.sibling) { 1601 if (i.sym.kind == MTH && (i.sym.flags() & HYPOTHETICAL) == 0) 1602 methods = methods.prepend((MethodSymbol)i.sym); 1603 } 1604 while (methods.nonEmpty()) { 1605 writeMethod(methods.head); 1606 methods = methods.tail; 1607 } 1608 } 1609 1610 /** Emit a class file for a given class. 1611 * @param c The class from which a class file is generated. 1612 */ 1613 public JavaFileObject writeClass(ClassSymbol c) 1614 throws IOException, PoolOverflow, StringOverflow 1615 { 1616 JavaFileObject outFile 1617 = fileManager.getJavaFileForOutput(CLASS_OUTPUT, 1618 c.flatname.toString(), 1619 JavaFileObject.Kind.CLASS, 1620 c.sourcefile); 1621 OutputStream out = outFile.openOutputStream(); 1622 try { 1623 writeClassFile(out, c); 1624 if (verbose) 1625 log.printVerbose("wrote.file", outFile); 1626 out.close(); 1627 out = null; 1628 } finally { 1629 if (out != null) { 1630 // if we are propagating an exception, delete the file 1631 out.close(); 1632 outFile.delete(); 1633 outFile = null; 1634 } 1635 } 1636 return outFile; // may be null if write failed 1637 } 1638 1639 /** Write class `c' to outstream `out'. 1640 */ 1641 public void writeClassFile(OutputStream out, ClassSymbol c) 1642 throws IOException, PoolOverflow, StringOverflow { 1643 Assert.check((c.flags() & COMPOUND) == 0); 1644 databuf.reset(); 1645 poolbuf.reset(); 1646 signatureGen.reset(); 1647 pool = c.pool; 1648 innerClasses = null; 1649 innerClassesQueue = null; 1650 bootstrapMethods = new LinkedHashMap<DynamicMethod, MethodHandle>(); 1651 1652 Type supertype = types.supertype(c.type); 1653 List<Type> interfaces = types.interfaces(c.type); 1654 List<Type> typarams = c.type.getTypeArguments(); 1655 1656 int flags = adjustFlags(c.flags() & ~DEFAULT); 1657 if ((flags & PROTECTED) != 0) flags |= PUBLIC; 1658 flags = flags & ClassFlags & ~STRICTFP; 1659 if ((flags & INTERFACE) == 0) flags |= ACC_SUPER; 1660 if (c.isInner() && c.name.isEmpty()) flags &= ~FINAL; 1661 if (dumpClassModifiers) { 1662 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR); 1663 pw.println(); 1664 pw.println("CLASSFILE " + c.getQualifiedName()); 1665 pw.println("---" + flagNames(flags)); 1666 } 1667 databuf.appendChar(flags); 1668 1669 databuf.appendChar(pool.put(c)); 1670 databuf.appendChar(supertype.hasTag(CLASS) ? pool.put(supertype.tsym) : 0); 1671 databuf.appendChar(interfaces.length()); 1672 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail) 1673 databuf.appendChar(pool.put(l.head.tsym)); 1674 int fieldsCount = 0; 1675 int methodsCount = 0; 1676 for (Scope.Entry e = c.members().elems; e != null; e = e.sibling) { 1677 switch (e.sym.kind) { 1678 case VAR: fieldsCount++; break; 1679 case MTH: if ((e.sym.flags() & HYPOTHETICAL) == 0) methodsCount++; 1680 break; 1681 case TYP: enterInner((ClassSymbol)e.sym); break; 1682 default : Assert.error(); 1683 } 1684 } 1685 1686 if (c.trans_local != null) { 1687 for (ClassSymbol local : c.trans_local) { 1688 enterInner(local); 1689 } 1690 } 1691 1692 databuf.appendChar(fieldsCount); 1693 writeFields(c.members().elems); 1694 databuf.appendChar(methodsCount); 1695 writeMethods(c.members().elems); 1696 1697 int acountIdx = beginAttrs(); 1698 int acount = 0; 1699 1700 boolean sigReq = 1701 typarams.length() != 0 || supertype.allparams().length() != 0; 1702 for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail) 1703 sigReq = l.head.allparams().length() != 0; 1704 if (sigReq) { 1705 Assert.check(source.allowGenerics()); 1706 int alenIdx = writeAttr(names.Signature); 1707 if (typarams.length() != 0) signatureGen.assembleParamsSig(typarams); 1708 signatureGen.assembleSig(supertype); 1709 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail) 1710 signatureGen.assembleSig(l.head); 1711 databuf.appendChar(pool.put(signatureGen.toName())); 1712 signatureGen.reset(); 1713 endAttr(alenIdx); 1714 acount++; 1715 } 1716 1717 if (c.sourcefile != null && emitSourceFile) { 1718 int alenIdx = writeAttr(names.SourceFile); 1719 // WHM 6/29/1999: Strip file path prefix. We do it here at 1720 // the last possible moment because the sourcefile may be used 1721 // elsewhere in error diagnostics. Fixes 4241573. 1722 //databuf.appendChar(c.pool.put(c.sourcefile)); 1723 String simpleName = BaseFileObject.getSimpleName(c.sourcefile); 1724 databuf.appendChar(c.pool.put(names.fromString(simpleName))); 1725 endAttr(alenIdx); 1726 acount++; 1727 } 1728 1729 if (genCrt) { 1730 // Append SourceID attribute 1731 int alenIdx = writeAttr(names.SourceID); 1732 databuf.appendChar(c.pool.put(names.fromString(Long.toString(getLastModified(c.sourcefile))))); 1733 endAttr(alenIdx); 1734 acount++; 1735 // Append CompilationID attribute 1736 alenIdx = writeAttr(names.CompilationID); 1737 databuf.appendChar(c.pool.put(names.fromString(Long.toString(System.currentTimeMillis())))); 1738 endAttr(alenIdx); 1739 acount++; 1740 } 1741 1742 acount += writeFlagAttrs(c.flags()); 1743 acount += writeJavaAnnotations(c.getRawAttributes()); 1744 acount += writeTypeAnnotations(c.getRawTypeAttributes(), false); 1745 acount += writeEnclosingMethodAttribute(c); 1746 acount += writeExtraClassAttributes(c); 1747 1748 poolbuf.appendInt(JAVA_MAGIC); 1749 poolbuf.appendChar(target.minorVersion); 1750 poolbuf.appendChar(target.majorVersion); 1751 1752 writePool(c.pool); 1753 1754 if (innerClasses != null) { 1755 writeInnerClasses(); 1756 acount++; 1757 } 1758 1759 if (!bootstrapMethods.isEmpty()) { 1760 writeBootstrapMethods(); 1761 acount++; 1762 } 1763 1764 endAttrs(acountIdx, acount); 1765 1766 poolbuf.appendBytes(databuf.elems, 0, databuf.length); 1767 out.write(poolbuf.elems, 0, poolbuf.length); 1768 1769 pool = c.pool = null; // to conserve space 1770 } 1771 1772 /**Allows subclasses to write additional class attributes 1773 * 1774 * @return the number of attributes written 1775 */ 1776 protected int writeExtraClassAttributes(ClassSymbol c) { 1777 return 0; 1778 } 1779 1780 int adjustFlags(final long flags) { 1781 int result = (int)flags; 1782 if ((flags & SYNTHETIC) != 0 && !target.useSyntheticFlag()) 1783 result &= ~SYNTHETIC; 1784 if ((flags & ENUM) != 0 && !target.useEnumFlag()) 1785 result &= ~ENUM; 1786 if ((flags & ANNOTATION) != 0 && !target.useAnnotationFlag()) 1787 result &= ~ANNOTATION; 1788 1789 if ((flags & BRIDGE) != 0 && target.useBridgeFlag()) 1790 result |= ACC_BRIDGE; 1791 if ((flags & VARARGS) != 0 && target.useVarargsFlag()) 1792 result |= ACC_VARARGS; 1793 if ((flags & DEFAULT) != 0) 1794 result &= ~ABSTRACT; 1795 return result; 1796 } 1797 1798 long getLastModified(FileObject filename) { 1799 long mod = 0; 1800 try { 1801 mod = filename.getLastModified(); 1802 } catch (SecurityException e) { 1803 throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage()); 1804 } 1805 return mod; 1806 } 1807 }