001 /*
002 * Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025
026 package com.sun.tools.javac.jvm;
027
028 import java.io.*;
029 import java.util.Set;
030 import java.util.HashSet;
031
032 import javax.tools.JavaFileManager;
033 import javax.tools.FileObject;
034 import javax.tools.JavaFileObject;
035
036 import com.sun.tools.javac.code.*;
037 import com.sun.tools.javac.code.Symbol.*;
038 import com.sun.tools.javac.code.Type.*;
039 import com.sun.tools.javac.util.*;
040 import com.sun.tools.javac.util.List;
041
042 import static com.sun.tools.javac.code.BoundKind.*;
043 import static com.sun.tools.javac.code.Flags.*;
044 import static com.sun.tools.javac.code.Kinds.*;
045 import static com.sun.tools.javac.code.TypeTags.*;
046 import static com.sun.tools.javac.jvm.UninitializedType.*;
047 import static javax.tools.StandardLocation.CLASS_OUTPUT;
048
049 /** This class provides operations to map an internal symbol table graph
050 * rooted in a ClassSymbol into a classfile.
051 *
052 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
053 * you write code that depends on this, you do so at your own risk.
054 * This code and its internal interfaces are subject to change or
055 * deletion without notice.</b>
056 */
057 public class ClassWriter extends ClassFile {
058 protected static final Context.Key<ClassWriter> classWriterKey =
059 new Context.Key<ClassWriter>();
060
061 private final Symtab syms;
062
063 private final Options options;
064
065 /** Switch: verbose output.
066 */
067 private boolean verbose;
068
069 /** Switch: scrable private names.
070 */
071 private boolean scramble;
072
073 /** Switch: scrable private names.
074 */
075 private boolean scrambleAll;
076
077 /** Switch: retrofit mode.
078 */
079 private boolean retrofit;
080
081 /** Switch: emit source file attribute.
082 */
083 private boolean emitSourceFile;
084
085 /** Switch: generate CharacterRangeTable attribute.
086 */
087 private boolean genCrt;
088
089 /** Switch: describe the generated stackmap
090 */
091 boolean debugstackmap;
092
093 /**
094 * Target class version.
095 */
096 private Target target;
097
098 /**
099 * Source language version.
100 */
101 private Source source;
102
103 /** Type utilities. */
104 private Types types;
105
106 /** The initial sizes of the data and constant pool buffers.
107 * sizes are increased when buffers get full.
108 */
109 static final int DATA_BUF_SIZE = 0x0fff0;
110 static final int POOL_BUF_SIZE = 0x1fff0;
111
112 /** An output buffer for member info.
113 */
114 ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE);
115
116 /** An output buffer for the constant pool.
117 */
118 ByteBuffer poolbuf = new ByteBuffer(POOL_BUF_SIZE);
119
120 /** An output buffer for type signatures.
121 */
122 ByteBuffer sigbuf = new ByteBuffer();
123
124 /** The constant pool.
125 */
126 Pool pool;
127
128 /** The inner classes to be written, as a set.
129 */
130 Set<ClassSymbol> innerClasses;
131
132 /** The inner classes to be written, as a queue where
133 * enclosing classes come first.
134 */
135 ListBuffer<ClassSymbol> innerClassesQueue;
136
137 /** The log to use for verbose output.
138 */
139 private final Log log;
140
141 /** The name table. */
142 private final Names names;
143
144 /** Access to files. */
145 private final JavaFileManager fileManager;
146
147 /** The tags and constants used in compressed stackmap. */
148 static final int SAME_FRAME_SIZE = 64;
149 static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247;
150 static final int SAME_FRAME_EXTENDED = 251;
151 static final int FULL_FRAME = 255;
152 static final int MAX_LOCAL_LENGTH_DIFF = 4;
153
154 /** Get the ClassWriter instance for this context. */
155 public static ClassWriter instance(Context context) {
156 ClassWriter instance = context.get(classWriterKey);
157 if (instance == null)
158 instance = new ClassWriter(context);
159 return instance;
160 }
161
162 /** Construct a class writer, given an options table.
163 */
164 private ClassWriter(Context context) {
165 context.put(classWriterKey, this);
166
167 log = Log.instance(context);
168 names = Names.instance(context);
169 syms = Symtab.instance(context);
170 options = Options.instance(context);
171 target = Target.instance(context);
172 source = Source.instance(context);
173 types = Types.instance(context);
174 fileManager = context.get(JavaFileManager.class);
175
176 verbose = options.get("-verbose") != null;
177 scramble = options.get("-scramble") != null;
178 scrambleAll = options.get("-scrambleAll") != null;
179 retrofit = options.get("-retrofit") != null;
180 genCrt = options.get("-Xjcov") != null;
181 debugstackmap = options.get("debugstackmap") != null;
182
183 emitSourceFile = options.get("-g:")==null || options.get("-g:source")!=null;
184
185 String dumpModFlags = options.get("dumpmodifiers");
186 dumpClassModifiers =
187 (dumpModFlags != null && dumpModFlags.indexOf('c') != -1);
188 dumpFieldModifiers =
189 (dumpModFlags != null && dumpModFlags.indexOf('f') != -1);
190 dumpInnerClassModifiers =
191 (dumpModFlags != null && dumpModFlags.indexOf('i') != -1);
192 dumpMethodModifiers =
193 (dumpModFlags != null && dumpModFlags.indexOf('m') != -1);
194 }
195
196 /******************************************************************
197 * Diagnostics: dump generated class names and modifiers
198 ******************************************************************/
199
200 /** Value of option 'dumpmodifiers' is a string
201 * indicating which modifiers should be dumped for debugging:
202 * 'c' -- classes
203 * 'f' -- fields
204 * 'i' -- innerclass attributes
205 * 'm' -- methods
206 * For example, to dump everything:
207 * javac -XDdumpmodifiers=cifm MyProg.java
208 */
209 private final boolean dumpClassModifiers; // -XDdumpmodifiers=c
210 private final boolean dumpFieldModifiers; // -XDdumpmodifiers=f
211 private final boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i
212 private final boolean dumpMethodModifiers; // -XDdumpmodifiers=m
213
214
215 /** Return flags as a string, separated by " ".
216 */
217 public static String flagNames(long flags) {
218 StringBuffer sbuf = new StringBuffer();
219 int i = 0;
220 long f = flags & StandardFlags;
221 while (f != 0) {
222 if ((f & 1) != 0) sbuf.append(" " + flagName[i]);
223 f = f >> 1;
224 i++;
225 }
226 return sbuf.toString();
227 }
228 //where
229 private final static String[] flagName = {
230 "PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL",
231 "SUPER", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE",
232 "ABSTRACT", "STRICTFP"};
233
234 /******************************************************************
235 * Output routines
236 ******************************************************************/
237
238 /** Write a character into given byte buffer;
239 * byte buffer will not be grown.
240 */
241 void putChar(ByteBuffer buf, int op, int x) {
242 buf.elems[op ] = (byte)((x >> 8) & 0xFF);
243 buf.elems[op+1] = (byte)((x ) & 0xFF);
244 }
245
246 /** Write an integer into given byte buffer;
247 * byte buffer will not be grown.
248 */
249 void putInt(ByteBuffer buf, int adr, int x) {
250 buf.elems[adr ] = (byte)((x >> 24) & 0xFF);
251 buf.elems[adr+1] = (byte)((x >> 16) & 0xFF);
252 buf.elems[adr+2] = (byte)((x >> 8) & 0xFF);
253 buf.elems[adr+3] = (byte)((x ) & 0xFF);
254 }
255
256 /******************************************************************
257 * Signature Generation
258 ******************************************************************/
259
260 /** Assemble signature of given type in string buffer.
261 */
262 void assembleSig(Type type) {
263 switch (type.tag) {
264 case BYTE:
265 sigbuf.appendByte('B');
266 break;
267 case SHORT:
268 sigbuf.appendByte('S');
269 break;
270 case CHAR:
271 sigbuf.appendByte('C');
272 break;
273 case INT:
274 sigbuf.appendByte('I');
275 break;
276 case LONG:
277 sigbuf.appendByte('J');
278 break;
279 case FLOAT:
280 sigbuf.appendByte('F');
281 break;
282 case DOUBLE:
283 sigbuf.appendByte('D');
284 break;
285 case BOOLEAN:
286 sigbuf.appendByte('Z');
287 break;
288 case VOID:
289 sigbuf.appendByte('V');
290 break;
291 case CLASS:
292 sigbuf.appendByte('L');
293 assembleClassSig(type);
294 sigbuf.appendByte(';');
295 break;
296 case ARRAY:
297 ArrayType at = (ArrayType)type;
298 sigbuf.appendByte('[');
299 assembleSig(at.elemtype);
300 break;
301 case METHOD:
302 MethodType mt = (MethodType)type;
303 sigbuf.appendByte('(');
304 assembleSig(mt.argtypes);
305 sigbuf.appendByte(')');
306 assembleSig(mt.restype);
307 if (hasTypeVar(mt.thrown)) {
308 for (List<Type> l = mt.thrown; l.nonEmpty(); l = l.tail) {
309 sigbuf.appendByte('^');
310 assembleSig(l.head);
311 }
312 }
313 break;
314 case WILDCARD: {
315 WildcardType ta = (WildcardType) type;
316 switch (ta.kind) {
317 case SUPER:
318 sigbuf.appendByte('-');
319 assembleSig(ta.type);
320 break;
321 case EXTENDS:
322 sigbuf.appendByte('+');
323 assembleSig(ta.type);
324 break;
325 case UNBOUND:
326 sigbuf.appendByte('*');
327 break;
328 default:
329 throw new AssertionError(ta.kind);
330 }
331 break;
332 }
333 case TYPEVAR:
334 sigbuf.appendByte('T');
335 sigbuf.appendName(type.tsym.name);
336 sigbuf.appendByte(';');
337 break;
338 case FORALL:
339 ForAll ft = (ForAll)type;
340 assembleParamsSig(ft.tvars);
341 assembleSig(ft.qtype);
342 break;
343 case UNINITIALIZED_THIS:
344 case UNINITIALIZED_OBJECT:
345 // we don't yet have a spec for uninitialized types in the
346 // local variable table
347 assembleSig(types.erasure(((UninitializedType)type).qtype));
348 break;
349 default:
350 throw new AssertionError("typeSig " + type.tag);
351 }
352 }
353
354 boolean hasTypeVar(List<Type> l) {
355 while (l.nonEmpty()) {
356 if (l.head.tag == TypeTags.TYPEVAR) return true;
357 l = l.tail;
358 }
359 return false;
360 }
361
362 void assembleClassSig(Type type) {
363 ClassType ct = (ClassType)type;
364 ClassSymbol c = (ClassSymbol)ct.tsym;
365 enterInner(c);
366 Type outer = ct.getEnclosingType();
367 if (outer.allparams().nonEmpty()) {
368 boolean rawOuter =
369 c.owner.kind == MTH || // either a local class
370 c.name == names.empty; // or anonymous
371 assembleClassSig(rawOuter
372 ? types.erasure(outer)
373 : outer);
374 sigbuf.appendByte('.');
375 assert c.flatname.startsWith(c.owner.enclClass().flatname);
376 sigbuf.appendName(rawOuter
377 ? c.flatname.subName(c.owner.enclClass().flatname.getByteLength()+1,c.flatname.getByteLength())
378 : c.name);
379 } else {
380 sigbuf.appendBytes(externalize(c.flatname));
381 }
382 if (ct.getTypeArguments().nonEmpty()) {
383 sigbuf.appendByte('<');
384 assembleSig(ct.getTypeArguments());
385 sigbuf.appendByte('>');
386 }
387 }
388
389
390 void assembleSig(List<Type> types) {
391 for (List<Type> ts = types; ts.nonEmpty(); ts = ts.tail)
392 assembleSig(ts.head);
393 }
394
395 void assembleParamsSig(List<Type> typarams) {
396 sigbuf.appendByte('<');
397 for (List<Type> ts = typarams; ts.nonEmpty(); ts = ts.tail) {
398 TypeVar tvar = (TypeVar)ts.head;
399 sigbuf.appendName(tvar.tsym.name);
400 List<Type> bounds = types.getBounds(tvar);
401 if ((bounds.head.tsym.flags() & INTERFACE) != 0) {
402 sigbuf.appendByte(':');
403 }
404 for (List<Type> l = bounds; l.nonEmpty(); l = l.tail) {
405 sigbuf.appendByte(':');
406 assembleSig(l.head);
407 }
408 }
409 sigbuf.appendByte('>');
410 }
411
412 /** Return signature of given type
413 */
414 Name typeSig(Type type) {
415 assert sigbuf.length == 0;
416 //- System.out.println(" ? " + type);
417 assembleSig(type);
418 Name n = sigbuf.toName(names);
419 sigbuf.reset();
420 //- System.out.println(" " + n);
421 return n;
422 }
423
424 /** Given a type t, return the extended class name of its erasure in
425 * external representation.
426 */
427 public Name xClassName(Type t) {
428 if (t.tag == CLASS) {
429 return names.fromUtf(externalize(t.tsym.flatName()));
430 } else if (t.tag == ARRAY) {
431 return typeSig(types.erasure(t));
432 } else {
433 throw new AssertionError("xClassName");
434 }
435 }
436
437 /******************************************************************
438 * Writing the Constant Pool
439 ******************************************************************/
440
441 /** Thrown when the constant pool is over full.
442 */
443 public static class PoolOverflow extends Exception {
444 private static final long serialVersionUID = 0;
445 public PoolOverflow() {}
446 }
447 public static class StringOverflow extends Exception {
448 private static final long serialVersionUID = 0;
449 public final String value;
450 public StringOverflow(String s) {
451 value = s;
452 }
453 }
454
455 /** Write constant pool to pool buffer.
456 * Note: during writing, constant pool
457 * might grow since some parts of constants still need to be entered.
458 */
459 void writePool(Pool pool) throws PoolOverflow, StringOverflow {
460 int poolCountIdx = poolbuf.length;
461 poolbuf.appendChar(0);
462 int i = 1;
463 while (i < pool.pp) {
464 Object value = pool.pool[i];
465 assert value != null;
466 if (value instanceof Pool.Method)
467 value = ((Pool.Method)value).m;
468 else if (value instanceof Pool.Variable)
469 value = ((Pool.Variable)value).v;
470
471 if (value instanceof MethodSymbol) {
472 MethodSymbol m = (MethodSymbol)value;
473 poolbuf.appendByte((m.owner.flags() & INTERFACE) != 0
474 ? CONSTANT_InterfaceMethodref
475 : CONSTANT_Methodref);
476 poolbuf.appendChar(pool.put(m.owner));
477 poolbuf.appendChar(pool.put(nameType(m)));
478 } else if (value instanceof VarSymbol) {
479 VarSymbol v = (VarSymbol)value;
480 poolbuf.appendByte(CONSTANT_Fieldref);
481 poolbuf.appendChar(pool.put(v.owner));
482 poolbuf.appendChar(pool.put(nameType(v)));
483 } else if (value instanceof Name) {
484 poolbuf.appendByte(CONSTANT_Utf8);
485 byte[] bs = ((Name)value).toUtf();
486 poolbuf.appendChar(bs.length);
487 poolbuf.appendBytes(bs, 0, bs.length);
488 if (bs.length > Pool.MAX_STRING_LENGTH)
489 throw new StringOverflow(value.toString());
490 } else if (value instanceof ClassSymbol) {
491 ClassSymbol c = (ClassSymbol)value;
492 if (c.owner.kind == TYP) pool.put(c.owner);
493 poolbuf.appendByte(CONSTANT_Class);
494 if (c.type.tag == ARRAY) {
495 poolbuf.appendChar(pool.put(typeSig(c.type)));
496 } else {
497 poolbuf.appendChar(pool.put(names.fromUtf(externalize(c.flatname))));
498 enterInner(c);
499 }
500 } else if (value instanceof NameAndType) {
501 NameAndType nt = (NameAndType)value;
502 poolbuf.appendByte(CONSTANT_NameandType);
503 poolbuf.appendChar(pool.put(nt.name));
504 poolbuf.appendChar(pool.put(typeSig(nt.type)));
505 } else if (value instanceof Integer) {
506 poolbuf.appendByte(CONSTANT_Integer);
507 poolbuf.appendInt(((Integer)value).intValue());
508 } else if (value instanceof Long) {
509 poolbuf.appendByte(CONSTANT_Long);
510 poolbuf.appendLong(((Long)value).longValue());
511 i++;
512 } else if (value instanceof Float) {
513 poolbuf.appendByte(CONSTANT_Float);
514 poolbuf.appendFloat(((Float)value).floatValue());
515 } else if (value instanceof Double) {
516 poolbuf.appendByte(CONSTANT_Double);
517 poolbuf.appendDouble(((Double)value).doubleValue());
518 i++;
519 } else if (value instanceof String) {
520 poolbuf.appendByte(CONSTANT_String);
521 poolbuf.appendChar(pool.put(names.fromString((String)value)));
522 } else if (value instanceof Type) {
523 Type type = (Type)value;
524 if (type.tag == CLASS) enterInner((ClassSymbol)type.tsym);
525 poolbuf.appendByte(CONSTANT_Class);
526 poolbuf.appendChar(pool.put(xClassName(type)));
527 } else {
528 assert false : "writePool " + value;
529 }
530 i++;
531 }
532 if (pool.pp > Pool.MAX_ENTRIES)
533 throw new PoolOverflow();
534 putChar(poolbuf, poolCountIdx, pool.pp);
535 }
536
537 /** Given a field, return its name.
538 */
539 Name fieldName(Symbol sym) {
540 if (scramble && (sym.flags() & PRIVATE) != 0 ||
541 scrambleAll && (sym.flags() & (PROTECTED | PUBLIC)) == 0)
542 return names.fromString("_$" + sym.name.getIndex());
543 else
544 return sym.name;
545 }
546
547 /** Given a symbol, return its name-and-type.
548 */
549 NameAndType nameType(Symbol sym) {
550 return new NameAndType(fieldName(sym),
551 retrofit
552 ? sym.erasure(types)
553 : sym.externalType(types));
554 // if we retrofit, then the NameAndType has been read in as is
555 // and no change is necessary. If we compile normally, the
556 // NameAndType is generated from a symbol reference, and the
557 // adjustment of adding an additional this$n parameter needs to be made.
558 }
559
560 /******************************************************************
561 * Writing Attributes
562 ******************************************************************/
563
564 /** Write header for an attribute to data buffer and return
565 * position past attribute length index.
566 */
567 int writeAttr(Name attrName) {
568 databuf.appendChar(pool.put(attrName));
569 databuf.appendInt(0);
570 return databuf.length;
571 }
572
573 /** Fill in attribute length.
574 */
575 void endAttr(int index) {
576 putInt(databuf, index - 4, databuf.length - index);
577 }
578
579 /** Leave space for attribute count and return index for
580 * number of attributes field.
581 */
582 int beginAttrs() {
583 databuf.appendChar(0);
584 return databuf.length;
585 }
586
587 /** Fill in number of attributes.
588 */
589 void endAttrs(int index, int count) {
590 putChar(databuf, index - 2, count);
591 }
592
593 /** Write the EnclosingMethod attribute if needed.
594 * Returns the number of attributes written (0 or 1).
595 */
596 int writeEnclosingMethodAttribute(ClassSymbol c) {
597 if (!target.hasEnclosingMethodAttribute() ||
598 c.owner.kind != MTH && // neither a local class
599 c.name != names.empty) // nor anonymous
600 return 0;
601
602 int alenIdx = writeAttr(names.EnclosingMethod);
603 ClassSymbol enclClass = c.owner.enclClass();
604 MethodSymbol enclMethod =
605 (c.owner.type == null // local to init block
606 || c.owner.kind != MTH) // or member init
607 ? null
608 : (MethodSymbol)c.owner;
609 databuf.appendChar(pool.put(enclClass));
610 databuf.appendChar(enclMethod == null ? 0 : pool.put(nameType(c.owner)));
611 endAttr(alenIdx);
612 return 1;
613 }
614
615 /** Write flag attributes; return number of attributes written.
616 */
617 int writeFlagAttrs(long flags) {
618 int acount = 0;
619 if ((flags & DEPRECATED) != 0) {
620 int alenIdx = writeAttr(names.Deprecated);
621 endAttr(alenIdx);
622 acount++;
623 }
624 if ((flags & ENUM) != 0 && !target.useEnumFlag()) {
625 int alenIdx = writeAttr(names.Enum);
626 endAttr(alenIdx);
627 acount++;
628 }
629 if ((flags & SYNTHETIC) != 0 && !target.useSyntheticFlag()) {
630 int alenIdx = writeAttr(names.Synthetic);
631 endAttr(alenIdx);
632 acount++;
633 }
634 if ((flags & BRIDGE) != 0 && !target.useBridgeFlag()) {
635 int alenIdx = writeAttr(names.Bridge);
636 endAttr(alenIdx);
637 acount++;
638 }
639 if ((flags & VARARGS) != 0 && !target.useVarargsFlag()) {
640 int alenIdx = writeAttr(names.Varargs);
641 endAttr(alenIdx);
642 acount++;
643 }
644 if ((flags & ANNOTATION) != 0 && !target.useAnnotationFlag()) {
645 int alenIdx = writeAttr(names.Annotation);
646 endAttr(alenIdx);
647 acount++;
648 }
649 return acount;
650 }
651
652 /** Write member (field or method) attributes;
653 * return number of attributes written.
654 */
655 int writeMemberAttrs(Symbol sym) {
656 int acount = writeFlagAttrs(sym.flags());
657 long flags = sym.flags();
658 if (source.allowGenerics() &&
659 (flags & (SYNTHETIC|BRIDGE)) != SYNTHETIC &&
660 (flags & ANONCONSTR) == 0 &&
661 (!types.isSameType(sym.type, sym.erasure(types)) ||
662 hasTypeVar(sym.type.getThrownTypes()))) {
663 // note that a local class with captured variables
664 // will get a signature attribute
665 int alenIdx = writeAttr(names.Signature);
666 databuf.appendChar(pool.put(typeSig(sym.type)));
667 endAttr(alenIdx);
668 acount++;
669 }
670 acount += writeJavaAnnotations(sym.getAnnotationMirrors());
671 return acount;
672 }
673
674 /** Write method parameter annotations;
675 * return number of attributes written.
676 */
677 int writeParameterAttrs(MethodSymbol m) {
678 boolean hasVisible = false;
679 boolean hasInvisible = false;
680 if (m.params != null) for (VarSymbol s : m.params) {
681 for (Attribute.Compound a : s.getAnnotationMirrors()) {
682 switch (getRetention(a.type.tsym)) {
683 case SOURCE: break;
684 case CLASS: hasInvisible = true; break;
685 case RUNTIME: hasVisible = true; break;
686 default: ;// /* fail soft */ throw new AssertionError(vis);
687 }
688 }
689 }
690
691 int attrCount = 0;
692 if (hasVisible) {
693 int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations);
694 databuf.appendByte(m.params.length());
695 for (VarSymbol s : m.params) {
696 ListBuffer<Attribute.Compound> buf = new ListBuffer<Attribute.Compound>();
697 for (Attribute.Compound a : s.getAnnotationMirrors())
698 if (getRetention(a.type.tsym) == RetentionPolicy.RUNTIME)
699 buf.append(a);
700 databuf.appendChar(buf.length());
701 for (Attribute.Compound a : buf)
702 writeCompoundAttribute(a);
703 }
704 endAttr(attrIndex);
705 attrCount++;
706 }
707 if (hasInvisible) {
708 int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations);
709 databuf.appendByte(m.params.length());
710 for (VarSymbol s : m.params) {
711 ListBuffer<Attribute.Compound> buf = new ListBuffer<Attribute.Compound>();
712 for (Attribute.Compound a : s.getAnnotationMirrors())
713 if (getRetention(a.type.tsym) == RetentionPolicy.CLASS)
714 buf.append(a);
715 databuf.appendChar(buf.length());
716 for (Attribute.Compound a : buf)
717 writeCompoundAttribute(a);
718 }
719 endAttr(attrIndex);
720 attrCount++;
721 }
722 return attrCount;
723 }
724
725 /**********************************************************************
726 * Writing Java-language annotations (aka metadata, attributes)
727 **********************************************************************/
728
729 /** Write Java-language annotations; return number of JVM
730 * attributes written (zero or one).
731 */
732 int writeJavaAnnotations(List<Attribute.Compound> attrs) {
733 if (attrs.isEmpty()) return 0;
734 ListBuffer<Attribute.Compound> visibles = new ListBuffer<Attribute.Compound>();
735 ListBuffer<Attribute.Compound> invisibles = new ListBuffer<Attribute.Compound>();
736 for (Attribute.Compound a : attrs) {
737 switch (getRetention(a.type.tsym)) {
738 case SOURCE: break;
739 case CLASS: invisibles.append(a); break;
740 case RUNTIME: visibles.append(a); break;
741 default: ;// /* fail soft */ throw new AssertionError(vis);
742 }
743 }
744
745 int attrCount = 0;
746 if (visibles.length() != 0) {
747 int attrIndex = writeAttr(names.RuntimeVisibleAnnotations);
748 databuf.appendChar(visibles.length());
749 for (Attribute.Compound a : visibles)
750 writeCompoundAttribute(a);
751 endAttr(attrIndex);
752 attrCount++;
753 }
754 if (invisibles.length() != 0) {
755 int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations);
756 databuf.appendChar(invisibles.length());
757 for (Attribute.Compound a : invisibles)
758 writeCompoundAttribute(a);
759 endAttr(attrIndex);
760 attrCount++;
761 }
762 return attrCount;
763 }
764
765 /** A mirror of java.lang.annotation.RetentionPolicy. */
766 enum RetentionPolicy {
767 SOURCE,
768 CLASS,
769 RUNTIME
770 }
771
772 RetentionPolicy getRetention(TypeSymbol annotationType) {
773 RetentionPolicy vis = RetentionPolicy.CLASS; // the default
774 Attribute.Compound c = annotationType.attribute(syms.retentionType.tsym);
775 if (c != null) {
776 Attribute value = c.member(names.value);
777 if (value != null && value instanceof Attribute.Enum) {
778 Name levelName = ((Attribute.Enum)value).value.name;
779 if (levelName == names.SOURCE) vis = RetentionPolicy.SOURCE;
780 else if (levelName == names.CLASS) vis = RetentionPolicy.CLASS;
781 else if (levelName == names.RUNTIME) vis = RetentionPolicy.RUNTIME;
782 else ;// /* fail soft */ throw new AssertionError(levelName);
783 }
784 }
785 return vis;
786 }
787
788 /** A visitor to write an attribute including its leading
789 * single-character marker.
790 */
791 class AttributeWriter implements Attribute.Visitor {
792 public void visitConstant(Attribute.Constant _value) {
793 Object value = _value.value;
794 switch (_value.type.tag) {
795 case BYTE:
796 databuf.appendByte('B');
797 break;
798 case CHAR:
799 databuf.appendByte('C');
800 break;
801 case SHORT:
802 databuf.appendByte('S');
803 break;
804 case INT:
805 databuf.appendByte('I');
806 break;
807 case LONG:
808 databuf.appendByte('J');
809 break;
810 case FLOAT:
811 databuf.appendByte('F');
812 break;
813 case DOUBLE:
814 databuf.appendByte('D');
815 break;
816 case BOOLEAN:
817 databuf.appendByte('Z');
818 break;
819 case CLASS:
820 assert value instanceof String;
821 databuf.appendByte('s');
822 value = names.fromString(value.toString()); // CONSTANT_Utf8
823 break;
824 default:
825 throw new AssertionError(_value.type);
826 }
827 databuf.appendChar(pool.put(value));
828 }
829 public void visitEnum(Attribute.Enum e) {
830 databuf.appendByte('e');
831 databuf.appendChar(pool.put(typeSig(e.value.type)));
832 databuf.appendChar(pool.put(e.value.name));
833 }
834 public void visitClass(Attribute.Class clazz) {
835 databuf.appendByte('c');
836 databuf.appendChar(pool.put(typeSig(clazz.type)));
837 }
838 public void visitCompound(Attribute.Compound compound) {
839 databuf.appendByte('@');
840 writeCompoundAttribute(compound);
841 }
842 public void visitError(Attribute.Error x) {
843 throw new AssertionError(x);
844 }
845 public void visitArray(Attribute.Array array) {
846 databuf.appendByte('[');
847 databuf.appendChar(array.values.length);
848 for (Attribute a : array.values) {
849 a.accept(this);
850 }
851 }
852 }
853 AttributeWriter awriter = new AttributeWriter();
854
855 /** Write a compound attribute excluding the '@' marker. */
856 void writeCompoundAttribute(Attribute.Compound c) {
857 databuf.appendChar(pool.put(typeSig(c.type)));
858 databuf.appendChar(c.values.length());
859 for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) {
860 databuf.appendChar(pool.put(p.fst.name));
861 p.snd.accept(awriter);
862 }
863 }
864
865 /**********************************************************************
866 * Writing Objects
867 **********************************************************************/
868
869 /** Enter an inner class into the `innerClasses' set/queue.
870 */
871 void enterInner(ClassSymbol c) {
872 assert !c.type.isCompound();
873 try {
874 c.complete();
875 } catch (CompletionFailure ex) {
876 System.err.println("error: " + c + ": " + ex.getMessage());
877 throw ex;
878 }
879 if (c.type.tag != CLASS) return; // arrays
880 if (pool != null && // pool might be null if called from xClassName
881 c.owner.kind != PCK &&
882 (innerClasses == null || !innerClasses.contains(c))) {
883 // log.errWriter.println("enter inner " + c);//DEBUG
884 if (c.owner.kind == TYP) enterInner((ClassSymbol)c.owner);
885 pool.put(c);
886 pool.put(c.name);
887 if (innerClasses == null) {
888 innerClasses = new HashSet<ClassSymbol>();
889 innerClassesQueue = new ListBuffer<ClassSymbol>();
890 pool.put(names.InnerClasses);
891 }
892 innerClasses.add(c);
893 innerClassesQueue.append(c);
894 }
895 }
896
897 /** Write "inner classes" attribute.
898 */
899 void writeInnerClasses() {
900 int alenIdx = writeAttr(names.InnerClasses);
901 databuf.appendChar(innerClassesQueue.length());
902 for (List<ClassSymbol> l = innerClassesQueue.toList();
903 l.nonEmpty();
904 l = l.tail) {
905 ClassSymbol inner = l.head;
906 char flags = (char) adjustFlags(inner.flags_field);
907 if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT
908 if (inner.name.isEmpty()) flags &= ~FINAL; // Anonymous class: unset FINAL flag
909 if (dumpInnerClassModifiers) {
910 log.errWriter.println("INNERCLASS " + inner.name);
911 log.errWriter.println("---" + flagNames(flags));
912 }
913 databuf.appendChar(pool.get(inner));
914 databuf.appendChar(
915 inner.owner.kind == TYP ? pool.get(inner.owner) : 0);
916 databuf.appendChar(
917 !inner.name.isEmpty() ? pool.get(inner.name) : 0);
918 databuf.appendChar(flags);
919 }
920 endAttr(alenIdx);
921 }
922
923 /** Write field symbol, entering all references into constant pool.
924 */
925 void writeField(VarSymbol v) {
926 int flags = adjustFlags(v.flags());
927 databuf.appendChar(flags);
928 if (dumpFieldModifiers) {
929 log.errWriter.println("FIELD " + fieldName(v));
930 log.errWriter.println("---" + flagNames(v.flags()));
931 }
932 databuf.appendChar(pool.put(fieldName(v)));
933 databuf.appendChar(pool.put(typeSig(v.erasure(types))));
934 int acountIdx = beginAttrs();
935 int acount = 0;
936 if (v.getConstValue() != null) {
937 int alenIdx = writeAttr(names.ConstantValue);
938 databuf.appendChar(pool.put(v.getConstValue()));
939 endAttr(alenIdx);
940 acount++;
941 }
942 acount += writeMemberAttrs(v);
943 endAttrs(acountIdx, acount);
944 }
945
946 /** Write method symbol, entering all references into constant pool.
947 */
948 void writeMethod(MethodSymbol m) {
949 int flags = adjustFlags(m.flags());
950 databuf.appendChar(flags);
951 if (dumpMethodModifiers) {
952 log.errWriter.println("METHOD " + fieldName(m));
953 log.errWriter.println("---" + flagNames(m.flags()));
954 }
955 databuf.appendChar(pool.put(fieldName(m)));
956 databuf.appendChar(pool.put(typeSig(m.externalType(types))));
957 int acountIdx = beginAttrs();
958 int acount = 0;
959 if (m.code != null) {
960 int alenIdx = writeAttr(names.Code);
961 writeCode(m.code);
962 m.code = null; // to conserve space
963 endAttr(alenIdx);
964 acount++;
965 }
966 List<Type> thrown = m.erasure(types).getThrownTypes();
967 if (thrown.nonEmpty()) {
968 int alenIdx = writeAttr(names.Exceptions);
969 databuf.appendChar(thrown.length());
970 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
971 databuf.appendChar(pool.put(l.head.tsym));
972 endAttr(alenIdx);
973 acount++;
974 }
975 if (m.defaultValue != null) {
976 int alenIdx = writeAttr(names.AnnotationDefault);
977 m.defaultValue.accept(awriter);
978 endAttr(alenIdx);
979 acount++;
980 }
981 acount += writeMemberAttrs(m);
982 acount += writeParameterAttrs(m);
983 endAttrs(acountIdx, acount);
984 }
985
986 /** Write code attribute of method.
987 */
988 void writeCode(Code code) {
989 databuf.appendChar(code.max_stack);
990 databuf.appendChar(code.max_locals);
991 databuf.appendInt(code.cp);
992 databuf.appendBytes(code.code, 0, code.cp);
993 databuf.appendChar(code.catchInfo.length());
994 for (List<char[]> l = code.catchInfo.toList();
995 l.nonEmpty();
996 l = l.tail) {
997 for (int i = 0; i < l.head.length; i++)
998 databuf.appendChar(l.head[i]);
999 }
1000 int acountIdx = beginAttrs();
1001 int acount = 0;
1002
1003 if (code.lineInfo.nonEmpty()) {
1004 int alenIdx = writeAttr(names.LineNumberTable);
1005 databuf.appendChar(code.lineInfo.length());
1006 for (List<char[]> l = code.lineInfo.reverse();
1007 l.nonEmpty();
1008 l = l.tail)
1009 for (int i = 0; i < l.head.length; i++)
1010 databuf.appendChar(l.head[i]);
1011 endAttr(alenIdx);
1012 acount++;
1013 }
1014
1015 if (genCrt && (code.crt != null)) {
1016 CRTable crt = code.crt;
1017 int alenIdx = writeAttr(names.CharacterRangeTable);
1018 int crtIdx = beginAttrs();
1019 int crtEntries = crt.writeCRT(databuf, code.lineMap, log);
1020 endAttrs(crtIdx, crtEntries);
1021 endAttr(alenIdx);
1022 acount++;
1023 }
1024
1025 // counter for number of generic local variables
1026 int nGenericVars = 0;
1027
1028 if (code.varBufferSize > 0) {
1029 int alenIdx = writeAttr(names.LocalVariableTable);
1030 databuf.appendChar(code.varBufferSize);
1031
1032 for (int i=0; i<code.varBufferSize; i++) {
1033 Code.LocalVar var = code.varBuffer[i];
1034
1035 // write variable info
1036 assert var.start_pc >= 0;
1037 assert var.start_pc <= code.cp;
1038 databuf.appendChar(var.start_pc);
1039 assert var.length >= 0;
1040 assert (var.start_pc + var.length) <= code.cp;
1041 databuf.appendChar(var.length);
1042 VarSymbol sym = var.sym;
1043 databuf.appendChar(pool.put(sym.name));
1044 Type vartype = sym.erasure(types);
1045 if (!types.isSameType(sym.type, vartype))
1046 nGenericVars++;
1047 databuf.appendChar(pool.put(typeSig(vartype)));
1048 databuf.appendChar(var.reg);
1049 }
1050 endAttr(alenIdx);
1051 acount++;
1052 }
1053
1054 if (nGenericVars > 0) {
1055 int alenIdx = writeAttr(names.LocalVariableTypeTable);
1056 databuf.appendChar(nGenericVars);
1057 int count = 0;
1058
1059 for (int i=0; i<code.varBufferSize; i++) {
1060 Code.LocalVar var = code.varBuffer[i];
1061 VarSymbol sym = var.sym;
1062 if (types.isSameType(sym.type, sym.erasure(types)))
1063 continue;
1064 count++;
1065 // write variable info
1066 databuf.appendChar(var.start_pc);
1067 databuf.appendChar(var.length);
1068 databuf.appendChar(pool.put(sym.name));
1069 databuf.appendChar(pool.put(typeSig(sym.type)));
1070 databuf.appendChar(var.reg);
1071 }
1072 assert count == nGenericVars;
1073 endAttr(alenIdx);
1074 acount++;
1075 }
1076
1077 if (code.stackMapBufferSize > 0) {
1078 if (debugstackmap) System.out.println("Stack map for " + code.meth);
1079 int alenIdx = writeAttr(code.stackMap.getAttributeName(names));
1080 writeStackMap(code);
1081 endAttr(alenIdx);
1082 acount++;
1083 }
1084 endAttrs(acountIdx, acount);
1085 }
1086
1087 void writeStackMap(Code code) {
1088 int nframes = code.stackMapBufferSize;
1089 if (debugstackmap) System.out.println(" nframes = " + nframes);
1090 databuf.appendChar(nframes);
1091
1092 switch (code.stackMap) {
1093 case CLDC:
1094 for (int i=0; i<nframes; i++) {
1095 if (debugstackmap) System.out.print(" " + i + ":");
1096 Code.StackMapFrame frame = code.stackMapBuffer[i];
1097
1098 // output PC
1099 if (debugstackmap) System.out.print(" pc=" + frame.pc);
1100 databuf.appendChar(frame.pc);
1101
1102 // output locals
1103 int localCount = 0;
1104 for (int j=0; j<frame.locals.length;
1105 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.locals[j]))) {
1106 localCount++;
1107 }
1108 if (debugstackmap) System.out.print(" nlocals=" +
1109 localCount);
1110 databuf.appendChar(localCount);
1111 for (int j=0; j<frame.locals.length;
1112 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.locals[j]))) {
1113 if (debugstackmap) System.out.print(" local[" + j + "]=");
1114 writeStackMapType(frame.locals[j]);
1115 }
1116
1117 // output stack
1118 int stackCount = 0;
1119 for (int j=0; j<frame.stack.length;
1120 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.stack[j]))) {
1121 stackCount++;
1122 }
1123 if (debugstackmap) System.out.print(" nstack=" +
1124 stackCount);
1125 databuf.appendChar(stackCount);
1126 for (int j=0; j<frame.stack.length;
1127 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.stack[j]))) {
1128 if (debugstackmap) System.out.print(" stack[" + j + "]=");
1129 writeStackMapType(frame.stack[j]);
1130 }
1131 if (debugstackmap) System.out.println();
1132 }
1133 break;
1134 case JSR202: {
1135 assert code.stackMapBuffer == null;
1136 for (int i=0; i<nframes; i++) {
1137 if (debugstackmap) System.out.print(" " + i + ":");
1138 StackMapTableFrame frame = code.stackMapTableBuffer[i];
1139 frame.write(this);
1140 if (debugstackmap) System.out.println();
1141 }
1142 break;
1143 }
1144 default:
1145 throw new AssertionError("Unexpected stackmap format value");
1146 }
1147 }
1148
1149 //where
1150 void writeStackMapType(Type t) {
1151 if (t == null) {
1152 if (debugstackmap) System.out.print("empty");
1153 databuf.appendByte(0);
1154 }
1155 else switch(t.tag) {
1156 case BYTE:
1157 case CHAR:
1158 case SHORT:
1159 case INT:
1160 case BOOLEAN:
1161 if (debugstackmap) System.out.print("int");
1162 databuf.appendByte(1);
1163 break;
1164 case FLOAT:
1165 if (debugstackmap) System.out.print("float");
1166 databuf.appendByte(2);
1167 break;
1168 case DOUBLE:
1169 if (debugstackmap) System.out.print("double");
1170 databuf.appendByte(3);
1171 break;
1172 case LONG:
1173 if (debugstackmap) System.out.print("long");
1174 databuf.appendByte(4);
1175 break;
1176 case BOT: // null
1177 if (debugstackmap) System.out.print("null");
1178 databuf.appendByte(5);
1179 break;
1180 case CLASS:
1181 case ARRAY:
1182 if (debugstackmap) System.out.print("object(" + t + ")");
1183 databuf.appendByte(7);
1184 databuf.appendChar(pool.put(t));
1185 break;
1186 case TYPEVAR:
1187 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")");
1188 databuf.appendByte(7);
1189 databuf.appendChar(pool.put(types.erasure(t).tsym));
1190 break;
1191 case UNINITIALIZED_THIS:
1192 if (debugstackmap) System.out.print("uninit_this");
1193 databuf.appendByte(6);
1194 break;
1195 case UNINITIALIZED_OBJECT:
1196 { UninitializedType uninitType = (UninitializedType)t;
1197 databuf.appendByte(8);
1198 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset);
1199 databuf.appendChar(uninitType.offset);
1200 }
1201 break;
1202 default:
1203 throw new AssertionError();
1204 }
1205 }
1206
1207 /** An entry in the JSR202 StackMapTable */
1208 abstract static class StackMapTableFrame {
1209 abstract int getFrameType();
1210
1211 void write(ClassWriter writer) {
1212 int frameType = getFrameType();
1213 writer.databuf.appendByte(frameType);
1214 if (writer.debugstackmap) System.out.print(" frame_type=" + frameType);
1215 }
1216
1217 static class SameFrame extends StackMapTableFrame {
1218 final int offsetDelta;
1219 SameFrame(int offsetDelta) {
1220 this.offsetDelta = offsetDelta;
1221 }
1222 int getFrameType() {
1223 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED;
1224 }
1225 @Override
1226 void write(ClassWriter writer) {
1227 super.write(writer);
1228 if (getFrameType() == SAME_FRAME_EXTENDED) {
1229 writer.databuf.appendChar(offsetDelta);
1230 if (writer.debugstackmap){
1231 System.out.print(" offset_delta=" + offsetDelta);
1232 }
1233 }
1234 }
1235 }
1236
1237 static class SameLocals1StackItemFrame extends StackMapTableFrame {
1238 final int offsetDelta;
1239 final Type stack;
1240 SameLocals1StackItemFrame(int offsetDelta, Type stack) {
1241 this.offsetDelta = offsetDelta;
1242 this.stack = stack;
1243 }
1244 int getFrameType() {
1245 return (offsetDelta < SAME_FRAME_SIZE) ?
1246 (SAME_FRAME_SIZE + offsetDelta) :
1247 SAME_LOCALS_1_STACK_ITEM_EXTENDED;
1248 }
1249 @Override
1250 void write(ClassWriter writer) {
1251 super.write(writer);
1252 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
1253 writer.databuf.appendChar(offsetDelta);
1254 if (writer.debugstackmap) {
1255 System.out.print(" offset_delta=" + offsetDelta);
1256 }
1257 }
1258 if (writer.debugstackmap) {
1259 System.out.print(" stack[" + 0 + "]=");
1260 }
1261 writer.writeStackMapType(stack);
1262 }
1263 }
1264
1265 static class ChopFrame extends StackMapTableFrame {
1266 final int frameType;
1267 final int offsetDelta;
1268 ChopFrame(int frameType, int offsetDelta) {
1269 this.frameType = frameType;
1270 this.offsetDelta = offsetDelta;
1271 }
1272 int getFrameType() { return frameType; }
1273 @Override
1274 void write(ClassWriter writer) {
1275 super.write(writer);
1276 writer.databuf.appendChar(offsetDelta);
1277 if (writer.debugstackmap) {
1278 System.out.print(" offset_delta=" + offsetDelta);
1279 }
1280 }
1281 }
1282
1283 static class AppendFrame extends StackMapTableFrame {
1284 final int frameType;
1285 final int offsetDelta;
1286 final Type[] locals;
1287 AppendFrame(int frameType, int offsetDelta, Type[] locals) {
1288 this.frameType = frameType;
1289 this.offsetDelta = offsetDelta;
1290 this.locals = locals;
1291 }
1292 int getFrameType() { return frameType; }
1293 @Override
1294 void write(ClassWriter writer) {
1295 super.write(writer);
1296 writer.databuf.appendChar(offsetDelta);
1297 if (writer.debugstackmap) {
1298 System.out.print(" offset_delta=" + offsetDelta);
1299 }
1300 for (int i=0; i<locals.length; i++) {
1301 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1302 writer.writeStackMapType(locals[i]);
1303 }
1304 }
1305 }
1306
1307 static class FullFrame extends StackMapTableFrame {
1308 final int offsetDelta;
1309 final Type[] locals;
1310 final Type[] stack;
1311 FullFrame(int offsetDelta, Type[] locals, Type[] stack) {
1312 this.offsetDelta = offsetDelta;
1313 this.locals = locals;
1314 this.stack = stack;
1315 }
1316 int getFrameType() { return FULL_FRAME; }
1317 @Override
1318 void write(ClassWriter writer) {
1319 super.write(writer);
1320 writer.databuf.appendChar(offsetDelta);
1321 writer.databuf.appendChar(locals.length);
1322 if (writer.debugstackmap) {
1323 System.out.print(" offset_delta=" + offsetDelta);
1324 System.out.print(" nlocals=" + locals.length);
1325 }
1326 for (int i=0; i<locals.length; i++) {
1327 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1328 writer.writeStackMapType(locals[i]);
1329 }
1330
1331 writer.databuf.appendChar(stack.length);
1332 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); }
1333 for (int i=0; i<stack.length; i++) {
1334 if (writer.debugstackmap) System.out.print(" stack[" + i + "]=");
1335 writer.writeStackMapType(stack[i]);
1336 }
1337 }
1338 }
1339
1340 /** Compare this frame with the previous frame and produce
1341 * an entry of compressed stack map frame. */
1342 static StackMapTableFrame getInstance(Code.StackMapFrame this_frame,
1343 int prev_pc,
1344 Type[] prev_locals,
1345 Types types) {
1346 Type[] locals = this_frame.locals;
1347 Type[] stack = this_frame.stack;
1348 int offset_delta = this_frame.pc - prev_pc - 1;
1349 if (stack.length == 1) {
1350 if (locals.length == prev_locals.length
1351 && compare(prev_locals, locals, types) == 0) {
1352 return new SameLocals1StackItemFrame(offset_delta, stack[0]);
1353 }
1354 } else if (stack.length == 0) {
1355 int diff_length = compare(prev_locals, locals, types);
1356 if (diff_length == 0) {
1357 return new SameFrame(offset_delta);
1358 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) {
1359 // APPEND
1360 Type[] local_diff = new Type[-diff_length];
1361 for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) {
1362 local_diff[j] = locals[i];
1363 }
1364 return new AppendFrame(SAME_FRAME_EXTENDED - diff_length,
1365 offset_delta,
1366 local_diff);
1367 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) {
1368 // CHOP
1369 return new ChopFrame(SAME_FRAME_EXTENDED - diff_length,
1370 offset_delta);
1371 }
1372 }
1373 // FULL_FRAME
1374 return new FullFrame(offset_delta, locals, stack);
1375 }
1376
1377 static boolean isInt(Type t) {
1378 return (t.tag < TypeTags.INT || t.tag == TypeTags.BOOLEAN);
1379 }
1380
1381 static boolean isSameType(Type t1, Type t2, Types types) {
1382 if (t1 == null) { return t2 == null; }
1383 if (t2 == null) { return false; }
1384
1385 if (isInt(t1) && isInt(t2)) { return true; }
1386
1387 if (t1.tag == UNINITIALIZED_THIS) {
1388 return t2.tag == UNINITIALIZED_THIS;
1389 } else if (t1.tag == UNINITIALIZED_OBJECT) {
1390 if (t2.tag == UNINITIALIZED_OBJECT) {
1391 return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset;
1392 } else {
1393 return false;
1394 }
1395 } else if (t2.tag == UNINITIALIZED_THIS || t2.tag == UNINITIALIZED_OBJECT) {
1396 return false;
1397 }
1398
1399 return types.isSameType(t1, t2);
1400 }
1401
1402 static int compare(Type[] arr1, Type[] arr2, Types types) {
1403 int diff_length = arr1.length - arr2.length;
1404 if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) {
1405 return Integer.MAX_VALUE;
1406 }
1407 int len = (diff_length > 0) ? arr2.length : arr1.length;
1408 for (int i=0; i<len; i++) {
1409 if (!isSameType(arr1[i], arr2[i], types)) {
1410 return Integer.MAX_VALUE;
1411 }
1412 }
1413 return diff_length;
1414 }
1415 }
1416
1417 void writeFields(Scope.Entry e) {
1418 // process them in reverse sibling order;
1419 // i.e., process them in declaration order.
1420 List<VarSymbol> vars = List.nil();
1421 for (Scope.Entry i = e; i != null; i = i.sibling) {
1422 if (i.sym.kind == VAR) vars = vars.prepend((VarSymbol)i.sym);
1423 }
1424 while (vars.nonEmpty()) {
1425 writeField(vars.head);
1426 vars = vars.tail;
1427 }
1428 }
1429
1430 void writeMethods(Scope.Entry e) {
1431 List<MethodSymbol> methods = List.nil();
1432 for (Scope.Entry i = e; i != null; i = i.sibling) {
1433 if (i.sym.kind == MTH && (i.sym.flags() & HYPOTHETICAL) == 0)
1434 methods = methods.prepend((MethodSymbol)i.sym);
1435 }
1436 while (methods.nonEmpty()) {
1437 writeMethod(methods.head);
1438 methods = methods.tail;
1439 }
1440 }
1441
1442 /** Emit a class file for a given class.
1443 * @param c The class from which a class file is generated.
1444 */
1445 public JavaFileObject writeClass(ClassSymbol c)
1446 throws IOException, PoolOverflow, StringOverflow
1447 {
1448 JavaFileObject outFile
1449 = fileManager.getJavaFileForOutput(CLASS_OUTPUT,
1450 c.flatname.toString(),
1451 JavaFileObject.Kind.CLASS,
1452 c.sourcefile);
1453 OutputStream out = outFile.openOutputStream();
1454 try {
1455 writeClassFile(out, c);
1456 if (verbose)
1457 log.errWriter.println(Log.getLocalizedString("verbose.wrote.file", outFile));
1458 out.close();
1459 out = null;
1460 } finally {
1461 if (out != null) {
1462 // if we are propogating an exception, delete the file
1463 out.close();
1464 outFile.delete();
1465 outFile = null;
1466 }
1467 }
1468 return outFile; // may be null if write failed
1469 }
1470
1471 /** Write class `c' to outstream `out'.
1472 */
1473 public void writeClassFile(OutputStream out, ClassSymbol c)
1474 throws IOException, PoolOverflow, StringOverflow {
1475 assert (c.flags() & COMPOUND) == 0;
1476 databuf.reset();
1477 poolbuf.reset();
1478 sigbuf.reset();
1479 pool = c.pool;
1480 innerClasses = null;
1481 innerClassesQueue = null;
1482
1483 Type supertype = types.supertype(c.type);
1484 List<Type> interfaces = types.interfaces(c.type);
1485 List<Type> typarams = c.type.getTypeArguments();
1486
1487 int flags = adjustFlags(c.flags());
1488 if ((flags & PROTECTED) != 0) flags |= PUBLIC;
1489 flags = flags & ClassFlags & ~STRICTFP;
1490 if ((flags & INTERFACE) == 0) flags |= ACC_SUPER;
1491 if (c.isInner() && c.name.isEmpty()) flags &= ~FINAL;
1492 if (dumpClassModifiers) {
1493 log.errWriter.println();
1494 log.errWriter.println("CLASSFILE " + c.getQualifiedName());
1495 log.errWriter.println("---" + flagNames(flags));
1496 }
1497 databuf.appendChar(flags);
1498
1499 databuf.appendChar(pool.put(c));
1500 databuf.appendChar(supertype.tag == CLASS ? pool.put(supertype.tsym) : 0);
1501 databuf.appendChar(interfaces.length());
1502 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1503 databuf.appendChar(pool.put(l.head.tsym));
1504 int fieldsCount = 0;
1505 int methodsCount = 0;
1506 for (Scope.Entry e = c.members().elems; e != null; e = e.sibling) {
1507 switch (e.sym.kind) {
1508 case VAR: fieldsCount++; break;
1509 case MTH: if ((e.sym.flags() & HYPOTHETICAL) == 0) methodsCount++;
1510 break;
1511 case TYP: enterInner((ClassSymbol)e.sym); break;
1512 default : assert false;
1513 }
1514 }
1515 databuf.appendChar(fieldsCount);
1516 writeFields(c.members().elems);
1517 databuf.appendChar(methodsCount);
1518 writeMethods(c.members().elems);
1519
1520 int acountIdx = beginAttrs();
1521 int acount = 0;
1522
1523 boolean sigReq =
1524 typarams.length() != 0 || supertype.getTypeArguments().length() != 0;
1525 for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail)
1526 sigReq = l.head.getTypeArguments().length() != 0;
1527 if (sigReq) {
1528 assert source.allowGenerics();
1529 int alenIdx = writeAttr(names.Signature);
1530 if (typarams.length() != 0) assembleParamsSig(typarams);
1531 assembleSig(supertype);
1532 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1533 assembleSig(l.head);
1534 databuf.appendChar(pool.put(sigbuf.toName(names)));
1535 sigbuf.reset();
1536 endAttr(alenIdx);
1537 acount++;
1538 }
1539
1540 if (c.sourcefile != null && emitSourceFile) {
1541 int alenIdx = writeAttr(names.SourceFile);
1542 // WHM 6/29/1999: Strip file path prefix. We do it here at
1543 // the last possible moment because the sourcefile may be used
1544 // elsewhere in error diagnostics. Fixes 4241573.
1545 //databuf.appendChar(c.pool.put(c.sourcefile));
1546 String filename = c.sourcefile.toString();
1547 int sepIdx = filename.lastIndexOf(File.separatorChar);
1548 // Allow '/' as separator on all platforms, e.g., on Win32.
1549 int slashIdx = filename.lastIndexOf('/');
1550 if (slashIdx > sepIdx) sepIdx = slashIdx;
1551 if (sepIdx >= 0) filename = filename.substring(sepIdx + 1);
1552 databuf.appendChar(c.pool.put(names.fromString(filename)));
1553 endAttr(alenIdx);
1554 acount++;
1555 }
1556
1557 if (genCrt) {
1558 // Append SourceID attribute
1559 int alenIdx = writeAttr(names.SourceID);
1560 databuf.appendChar(c.pool.put(names.fromString(Long.toString(getLastModified(c.sourcefile)))));
1561 endAttr(alenIdx);
1562 acount++;
1563 // Append CompilationID attribute
1564 alenIdx = writeAttr(names.CompilationID);
1565 databuf.appendChar(c.pool.put(names.fromString(Long.toString(System.currentTimeMillis()))));
1566 endAttr(alenIdx);
1567 acount++;
1568 }
1569
1570 acount += writeFlagAttrs(c.flags());
1571 acount += writeJavaAnnotations(c.getAnnotationMirrors());
1572 acount += writeEnclosingMethodAttribute(c);
1573
1574 poolbuf.appendInt(JAVA_MAGIC);
1575 poolbuf.appendChar(target.minorVersion);
1576 poolbuf.appendChar(target.majorVersion);
1577
1578 writePool(c.pool);
1579
1580 if (innerClasses != null) {
1581 writeInnerClasses();
1582 acount++;
1583 }
1584 endAttrs(acountIdx, acount);
1585
1586 poolbuf.appendBytes(databuf.elems, 0, databuf.length);
1587 out.write(poolbuf.elems, 0, poolbuf.length);
1588
1589 pool = c.pool = null; // to conserve space
1590 }
1591
1592 int adjustFlags(final long flags) {
1593 int result = (int)flags;
1594 if ((flags & SYNTHETIC) != 0 && !target.useSyntheticFlag())
1595 result &= ~SYNTHETIC;
1596 if ((flags & ENUM) != 0 && !target.useEnumFlag())
1597 result &= ~ENUM;
1598 if ((flags & ANNOTATION) != 0 && !target.useAnnotationFlag())
1599 result &= ~ANNOTATION;
1600
1601 if ((flags & BRIDGE) != 0 && target.useBridgeFlag())
1602 result |= ACC_BRIDGE;
1603 if ((flags & VARARGS) != 0 && target.useVarargsFlag())
1604 result |= ACC_VARARGS;
1605 return result;
1606 }
1607
1608 long getLastModified(FileObject filename) {
1609 long mod = 0;
1610 try {
1611 mod = filename.getLastModified();
1612 } catch (SecurityException e) {
1613 throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage());
1614 }
1615 return mod;
1616 }
1617 }