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.lang.model.type.TypeKind;
35 import javax.tools.JavaFileManager;
36 import javax.tools.FileObject;
37 import javax.tools.JavaFileObject;
38
39 import com.sun.tools.javac.code.*;
40 import com.sun.tools.javac.code.Attribute.RetentionPolicy;
41 import com.sun.tools.javac.code.Attribute.TypeCompound;
42 import com.sun.tools.javac.code.Symbol.*;
43 import com.sun.tools.javac.code.Type.*;
44 import com.sun.tools.javac.code.Types.UniqueType;
45 import com.sun.tools.javac.file.BaseFileObject;
46 import com.sun.tools.javac.jvm.Pool.DynamicMethod;
47 import com.sun.tools.javac.jvm.Pool.Method;
48 import com.sun.tools.javac.jvm.Pool.MethodHandle;
49 import com.sun.tools.javac.jvm.Pool.Variable;
50 import com.sun.tools.javac.util.*;
51
52 import static com.sun.tools.javac.code.Flags.*;
53 import static com.sun.tools.javac.code.Kinds.*;
54 import static com.sun.tools.javac.code.TypeTag.*;
55 import static com.sun.tools.javac.jvm.UninitializedType.*;
56 import static com.sun.tools.javac.main.Option.*;
57 import static javax.tools.StandardLocation.CLASS_OUTPUT;
58
59
60 /** This class provides operations to map an internal symbol table graph
61 * rooted in a ClassSymbol into a classfile.
62 *
63 * <p><b>This is NOT part of any supported API.
64 * If you write code that depends on this, you do so at your own risk.
65 * This code and its internal interfaces are subject to change or
66 * deletion without notice.</b>
67 */
68 public class ClassWriter extends ClassFile {
69 protected static final Context.Key<ClassWriter> classWriterKey =
70 new Context.Key<ClassWriter>();
71
72 private final Options options;
73
74 /** Switch: verbose output.
75 */
76 private boolean verbose;
77
78 /** Switch: scramble private field names.
79 */
80 private boolean scramble;
81
82 /** Switch: scramble all field names.
83 */
84 private boolean scrambleAll;
85
86 /** Switch: retrofit mode.
87 */
88 private boolean retrofit;
89
90 /** Switch: emit source file attribute.
91 */
92 private boolean emitSourceFile;
93
94 /** Switch: generate CharacterRangeTable attribute.
95 */
96 private boolean genCrt;
97
98 /** Switch: describe the generated stackmap.
99 */
100 boolean debugstackmap;
101
102 /**
103 * Target class version.
104 */
105 private Target target;
106
107 /**
108 * Source language version.
109 */
110 private Source source;
111
112 /** Type utilities. */
113 private Types types;
114
115 /** The initial sizes of the data and constant pool buffers.
116 * Sizes are increased when buffers get full.
117 */
118 static final int DATA_BUF_SIZE = 0x0fff0;
119 static final int POOL_BUF_SIZE = 0x1fff0;
120
121 /** An output buffer for member info.
122 */
123 ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE);
124
125 /** An output buffer for the constant pool.
126 */
127 ByteBuffer poolbuf = new ByteBuffer(POOL_BUF_SIZE);
128
129 /** An output buffer for type signatures.
130 */
131 ByteBuffer sigbuf = new ByteBuffer();
132
133 /** The constant pool.
134 */
135 Pool pool;
136
137 /** The inner classes to be written, as a set.
138 */
139 Set<ClassSymbol> innerClasses;
140
141 /** The inner classes to be written, as a queue where
142 * enclosing classes come first.
143 */
144 ListBuffer<ClassSymbol> innerClassesQueue;
145
146 /** The bootstrap methods to be written in the corresponding class attribute
147 * (one for each invokedynamic)
148 */
149 Map<DynamicMethod, MethodHandle> bootstrapMethods;
150
151 /** The log to use for verbose output.
152 */
153 private final Log log;
154
155 /** The name table. */
156 private final Names names;
157
158 /** Access to files. */
159 private final JavaFileManager fileManager;
160
161 /** The tags and constants used in compressed stackmap. */
162 static final int SAME_FRAME_SIZE = 64;
163 static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247;
164 static final int SAME_FRAME_EXTENDED = 251;
165 static final int FULL_FRAME = 255;
166 static final int MAX_LOCAL_LENGTH_DIFF = 4;
167
168 /** Get the ClassWriter instance for this context. */
169 public static ClassWriter instance(Context context) {
170 ClassWriter instance = context.get(classWriterKey);
171 if (instance == null)
172 instance = new ClassWriter(context);
173 return instance;
174 }
175
176 /** Construct a class writer, given an options table.
177 */
178 protected ClassWriter(Context context) {
179 context.put(classWriterKey, this);
180
181 log = Log.instance(context);
182 names = Names.instance(context);
183 options = Options.instance(context);
184 target = Target.instance(context);
185 source = Source.instance(context);
186 types = Types.instance(context);
187 fileManager = context.get(JavaFileManager.class);
188
189 verbose = options.isSet(VERBOSE);
190 scramble = options.isSet("-scramble");
191 scrambleAll = options.isSet("-scrambleAll");
192 retrofit = options.isSet("-retrofit");
193 genCrt = options.isSet(XJCOV);
194 debugstackmap = options.isSet("debugstackmap");
195
196 emitSourceFile = options.isUnset(G_CUSTOM) ||
197 options.isSet(G_CUSTOM, "source");
198
199 String dumpModFlags = options.get("dumpmodifiers");
200 dumpClassModifiers =
201 (dumpModFlags != null && dumpModFlags.indexOf('c') != -1);
202 dumpFieldModifiers =
203 (dumpModFlags != null && dumpModFlags.indexOf('f') != -1);
204 dumpInnerClassModifiers =
205 (dumpModFlags != null && dumpModFlags.indexOf('i') != -1);
206 dumpMethodModifiers =
207 (dumpModFlags != null && dumpModFlags.indexOf('m') != -1);
208 }
209
210 /******************************************************************
211 * Diagnostics: dump generated class names and modifiers
212 ******************************************************************/
213
214 /** Value of option 'dumpmodifiers' is a string
215 * indicating which modifiers should be dumped for debugging:
216 * 'c' -- classes
217 * 'f' -- fields
218 * 'i' -- innerclass attributes
219 * 'm' -- methods
220 * For example, to dump everything:
221 * javac -XDdumpmodifiers=cifm MyProg.java
222 */
223 private final boolean dumpClassModifiers; // -XDdumpmodifiers=c
224 private final boolean dumpFieldModifiers; // -XDdumpmodifiers=f
225 private final boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i
226 private final boolean dumpMethodModifiers; // -XDdumpmodifiers=m
227
228
229 /** Return flags as a string, separated by " ".
230 */
231 public static String flagNames(long flags) {
232 StringBuilder sbuf = new StringBuilder();
233 int i = 0;
234 long f = flags & StandardFlags;
235 while (f != 0) {
236 if ((f & 1) != 0) {
237 sbuf.append(" ");
238 sbuf.append(flagName[i]);
239 }
240 f = f >> 1;
241 i++;
242 }
243 return sbuf.toString();
244 }
245 //where
246 private final static String[] flagName = {
247 "PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL",
248 "SUPER", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE",
249 "ABSTRACT", "STRICTFP"};
250
251 /******************************************************************
252 * Output routines
253 ******************************************************************/
254
255 /** Write a character into given byte buffer;
256 * byte buffer will not be grown.
257 */
258 void putChar(ByteBuffer buf, int op, int x) {
259 buf.elems[op ] = (byte)((x >> 8) & 0xFF);
260 buf.elems[op+1] = (byte)((x ) & 0xFF);
261 }
262
263 /** Write an integer into given byte buffer;
264 * byte buffer will not be grown.
265 */
266 void putInt(ByteBuffer buf, int adr, int x) {
267 buf.elems[adr ] = (byte)((x >> 24) & 0xFF);
268 buf.elems[adr+1] = (byte)((x >> 16) & 0xFF);
269 buf.elems[adr+2] = (byte)((x >> 8) & 0xFF);
270 buf.elems[adr+3] = (byte)((x ) & 0xFF);
271 }
272
273 /******************************************************************
274 * Signature Generation
275 ******************************************************************/
276
277 /** Assemble signature of given type in string buffer.
278 */
279 void assembleSig(Type type) {
280 type = type.unannotatedType();
281 switch (type.getTag()) {
282 case BYTE:
283 sigbuf.appendByte('B');
284 break;
285 case SHORT:
286 sigbuf.appendByte('S');
287 break;
288 case CHAR:
289 sigbuf.appendByte('C');
290 break;
291 case INT:
292 sigbuf.appendByte('I');
293 break;
294 case LONG:
295 sigbuf.appendByte('J');
296 break;
297 case FLOAT:
298 sigbuf.appendByte('F');
299 break;
300 case DOUBLE:
301 sigbuf.appendByte('D');
302 break;
303 case BOOLEAN:
304 sigbuf.appendByte('Z');
305 break;
306 case VOID:
307 sigbuf.appendByte('V');
308 break;
309 case CLASS:
310 sigbuf.appendByte('L');
311 assembleClassSig(type);
312 sigbuf.appendByte(';');
313 break;
314 case ARRAY:
315 ArrayType at = (ArrayType)type;
316 sigbuf.appendByte('[');
317 assembleSig(at.elemtype);
318 break;
319 case METHOD:
320 MethodType mt = (MethodType)type;
321 sigbuf.appendByte('(');
322 assembleSig(mt.argtypes);
323 sigbuf.appendByte(')');
324 assembleSig(mt.restype);
325 if (hasTypeVar(mt.thrown)) {
326 for (List<Type> l = mt.thrown; l.nonEmpty(); l = l.tail) {
327 sigbuf.appendByte('^');
328 assembleSig(l.head);
329 }
330 }
331 break;
332 case WILDCARD: {
333 WildcardType ta = (WildcardType) type;
334 switch (ta.kind) {
335 case SUPER:
336 sigbuf.appendByte('-');
337 assembleSig(ta.type);
338 break;
339 case EXTENDS:
340 sigbuf.appendByte('+');
341 assembleSig(ta.type);
342 break;
343 case UNBOUND:
344 sigbuf.appendByte('*');
345 break;
346 default:
347 throw new AssertionError(ta.kind);
348 }
349 break;
350 }
351 case TYPEVAR:
352 sigbuf.appendByte('T');
353 sigbuf.appendName(type.tsym.name);
354 sigbuf.appendByte(';');
355 break;
356 case FORALL:
357 ForAll ft = (ForAll)type;
358 assembleParamsSig(ft.tvars);
359 assembleSig(ft.qtype);
360 break;
361 case UNINITIALIZED_THIS:
362 case UNINITIALIZED_OBJECT:
363 // we don't yet have a spec for uninitialized types in the
364 // local variable table
365 assembleSig(types.erasure(((UninitializedType)type).qtype));
366 break;
367 default:
368 throw new AssertionError("typeSig " + type.getTag());
369 }
370 }
371
372 boolean hasTypeVar(List<Type> l) {
373 while (l.nonEmpty()) {
374 if (l.head.hasTag(TYPEVAR)) return true;
375 l = l.tail;
376 }
377 return false;
378 }
379
380 void assembleClassSig(Type type) {
381 type = type.unannotatedType();
382 ClassType ct = (ClassType)type;
383 ClassSymbol c = (ClassSymbol)ct.tsym;
384 enterInner(c);
385 Type outer = ct.getEnclosingType();
386 if (outer.allparams().nonEmpty()) {
387 boolean rawOuter =
388 c.owner.kind == MTH || // either a local class
389 c.name == names.empty; // or anonymous
390 assembleClassSig(rawOuter
391 ? types.erasure(outer)
392 : outer);
393 sigbuf.appendByte('.');
394 Assert.check(c.flatname.startsWith(c.owner.enclClass().flatname));
395 sigbuf.appendName(rawOuter
396 ? c.flatname.subName(c.owner.enclClass().flatname.getByteLength()+1,c.flatname.getByteLength())
397 : c.name);
398 } else {
399 sigbuf.appendBytes(externalize(c.flatname));
400 }
401 if (ct.getTypeArguments().nonEmpty()) {
402 sigbuf.appendByte('<');
403 assembleSig(ct.getTypeArguments());
404 sigbuf.appendByte('>');
405 }
406 }
407
408
409 void assembleSig(List<Type> types) {
410 for (List<Type> ts = types; ts.nonEmpty(); ts = ts.tail)
411 assembleSig(ts.head);
412 }
413
414 void assembleParamsSig(List<Type> typarams) {
415 sigbuf.appendByte('<');
416 for (List<Type> ts = typarams; ts.nonEmpty(); ts = ts.tail) {
417 TypeVar tvar = (TypeVar)ts.head;
418 sigbuf.appendName(tvar.tsym.name);
419 List<Type> bounds = types.getBounds(tvar);
420 if ((bounds.head.tsym.flags() & INTERFACE) != 0) {
421 sigbuf.appendByte(':');
422 }
423 for (List<Type> l = bounds; l.nonEmpty(); l = l.tail) {
424 sigbuf.appendByte(':');
425 assembleSig(l.head);
426 }
427 }
428 sigbuf.appendByte('>');
429 }
430
431 /** Return signature of given type
432 */
433 Name typeSig(Type type) {
434 Assert.check(sigbuf.length == 0);
435 //- System.out.println(" ? " + type);
436 assembleSig(type);
437 Name n = sigbuf.toName(names);
438 sigbuf.reset();
439 //- System.out.println(" " + n);
440 return n;
441 }
442
443 /** Given a type t, return the extended class name of its erasure in
444 * external representation.
445 */
446 public Name xClassName(Type t) {
447 if (t.hasTag(CLASS)) {
448 return names.fromUtf(externalize(t.tsym.flatName()));
449 } else if (t.hasTag(ARRAY)) {
450 return typeSig(types.erasure(t));
451 } else {
452 throw new AssertionError("xClassName");
453 }
454 }
455
456 /******************************************************************
457 * Writing the Constant Pool
458 ******************************************************************/
459
460 /** Thrown when the constant pool is over full.
461 */
462 public static class PoolOverflow extends Exception {
463 private static final long serialVersionUID = 0;
464 public PoolOverflow() {}
465 }
466 public static class StringOverflow extends Exception {
467 private static final long serialVersionUID = 0;
468 public final String value;
469 public StringOverflow(String s) {
470 value = s;
471 }
472 }
473
474 /** Write constant pool to pool buffer.
475 * Note: during writing, constant pool
476 * might grow since some parts of constants still need to be entered.
477 */
478 void writePool(Pool pool) throws PoolOverflow, StringOverflow {
479 int poolCountIdx = poolbuf.length;
480 poolbuf.appendChar(0);
481 int i = 1;
482 while (i < pool.pp) {
483 Object value = pool.pool[i];
484 Assert.checkNonNull(value);
485 if (value instanceof Method)
486 value = ((Method)value).m;
487 else if (value instanceof Variable)
488 value = ((Variable)value).v;
489
490 if (value instanceof MethodSymbol) {
491 MethodSymbol m = (MethodSymbol)value;
492 if (!m.isDynamic()) {
493 poolbuf.appendByte((m.owner.flags() & INTERFACE) != 0
494 ? CONSTANT_InterfaceMethodref
495 : CONSTANT_Methodref);
496 poolbuf.appendChar(pool.put(m.owner));
497 poolbuf.appendChar(pool.put(nameType(m)));
498 } else {
499 //invokedynamic
500 DynamicMethodSymbol dynSym = (DynamicMethodSymbol)m;
501 MethodHandle handle = new MethodHandle(dynSym.bsmKind, dynSym.bsm, types);
502 DynamicMethod dynMeth = new DynamicMethod(dynSym, types);
503 bootstrapMethods.put(dynMeth, handle);
504 //init cp entries
505 pool.put(names.BootstrapMethods);
506 pool.put(handle);
507 for (Object staticArg : dynSym.staticArgs) {
508 pool.put(staticArg);
509 }
510 poolbuf.appendByte(CONSTANT_InvokeDynamic);
511 poolbuf.appendChar(bootstrapMethods.size() - 1);
512 poolbuf.appendChar(pool.put(nameType(dynSym)));
513 }
514 } else if (value instanceof VarSymbol) {
515 VarSymbol v = (VarSymbol)value;
516 poolbuf.appendByte(CONSTANT_Fieldref);
517 poolbuf.appendChar(pool.put(v.owner));
518 poolbuf.appendChar(pool.put(nameType(v)));
519 } else if (value instanceof Name) {
520 poolbuf.appendByte(CONSTANT_Utf8);
521 byte[] bs = ((Name)value).toUtf();
522 poolbuf.appendChar(bs.length);
523 poolbuf.appendBytes(bs, 0, bs.length);
524 if (bs.length > Pool.MAX_STRING_LENGTH)
525 throw new StringOverflow(value.toString());
526 } else if (value instanceof ClassSymbol) {
527 ClassSymbol c = (ClassSymbol)value;
528 if (c.owner.kind == TYP) pool.put(c.owner);
529 poolbuf.appendByte(CONSTANT_Class);
530 if (c.type.hasTag(ARRAY)) {
531 poolbuf.appendChar(pool.put(typeSig(c.type)));
532 } else {
533 poolbuf.appendChar(pool.put(names.fromUtf(externalize(c.flatname))));
534 enterInner(c);
535 }
536 } else if (value instanceof NameAndType) {
537 NameAndType nt = (NameAndType)value;
538 poolbuf.appendByte(CONSTANT_NameandType);
539 poolbuf.appendChar(pool.put(nt.name));
540 poolbuf.appendChar(pool.put(typeSig(nt.uniqueType.type)));
541 } else if (value instanceof Integer) {
542 poolbuf.appendByte(CONSTANT_Integer);
543 poolbuf.appendInt(((Integer)value).intValue());
544 } else if (value instanceof Long) {
545 poolbuf.appendByte(CONSTANT_Long);
546 poolbuf.appendLong(((Long)value).longValue());
547 i++;
548 } else if (value instanceof Float) {
549 poolbuf.appendByte(CONSTANT_Float);
550 poolbuf.appendFloat(((Float)value).floatValue());
551 } else if (value instanceof Double) {
552 poolbuf.appendByte(CONSTANT_Double);
553 poolbuf.appendDouble(((Double)value).doubleValue());
554 i++;
555 } else if (value instanceof String) {
556 poolbuf.appendByte(CONSTANT_String);
557 poolbuf.appendChar(pool.put(names.fromString((String)value)));
558 } else if (value instanceof UniqueType) {
559 Type type = ((UniqueType)value).type;
560 if (type instanceof MethodType) {
561 poolbuf.appendByte(CONSTANT_MethodType);
562 poolbuf.appendChar(pool.put(typeSig((MethodType)type)));
563 } else {
564 if (type.hasTag(CLASS)) enterInner((ClassSymbol)type.tsym);
565 poolbuf.appendByte(CONSTANT_Class);
566 poolbuf.appendChar(pool.put(xClassName(type)));
567 }
568 } else if (value instanceof MethodHandle) {
569 MethodHandle ref = (MethodHandle)value;
570 poolbuf.appendByte(CONSTANT_MethodHandle);
571 poolbuf.appendByte(ref.refKind);
572 poolbuf.appendChar(pool.put(ref.refSym));
573 } else {
574 Assert.error("writePool " + value);
575 }
576 i++;
577 }
578 if (pool.pp > Pool.MAX_ENTRIES)
579 throw new PoolOverflow();
580 putChar(poolbuf, poolCountIdx, pool.pp);
581 }
582
583 /** Given a field, return its name.
584 */
585 Name fieldName(Symbol sym) {
586 if (scramble && (sym.flags() & PRIVATE) != 0 ||
587 scrambleAll && (sym.flags() & (PROTECTED | PUBLIC)) == 0)
588 return names.fromString("_$" + sym.name.getIndex());
589 else
590 return sym.name;
591 }
592
593 /** Given a symbol, return its name-and-type.
594 */
595 NameAndType nameType(Symbol sym) {
596 return new NameAndType(fieldName(sym),
597 retrofit
598 ? sym.erasure(types)
599 : sym.externalType(types), types);
600 // if we retrofit, then the NameAndType has been read in as is
601 // and no change is necessary. If we compile normally, the
602 // NameAndType is generated from a symbol reference, and the
603 // adjustment of adding an additional this$n parameter needs to be made.
604 }
605
606 /******************************************************************
607 * Writing Attributes
608 ******************************************************************/
609
610 /** Write header for an attribute to data buffer and return
611 * position past attribute length index.
612 */
613 int writeAttr(Name attrName) {
614 databuf.appendChar(pool.put(attrName));
615 databuf.appendInt(0);
616 return databuf.length;
617 }
618
619 /** Fill in attribute length.
620 */
621 void endAttr(int index) {
622 putInt(databuf, index - 4, databuf.length - index);
623 }
624
625 /** Leave space for attribute count and return index for
626 * number of attributes field.
627 */
628 int beginAttrs() {
629 databuf.appendChar(0);
630 return databuf.length;
631 }
632
633 /** Fill in number of attributes.
634 */
635 void endAttrs(int index, int count) {
636 putChar(databuf, index - 2, count);
637 }
638
639 /** Write the EnclosingMethod attribute if needed.
640 * Returns the number of attributes written (0 or 1).
641 */
642 int writeEnclosingMethodAttribute(ClassSymbol c) {
643 if (!target.hasEnclosingMethodAttribute())
644 return 0;
645 return writeEnclosingMethodAttribute(names.EnclosingMethod, c);
646 }
647
648 /** Write the EnclosingMethod attribute with a specified name.
649 * Returns the number of attributes written (0 or 1).
650 */
651 protected int writeEnclosingMethodAttribute(Name attributeName, ClassSymbol c) {
652 if (c.owner.kind != MTH && // neither a local class
653 c.name != names.empty) // nor anonymous
654 return 0;
655
656 int alenIdx = writeAttr(attributeName);
657 ClassSymbol enclClass = c.owner.enclClass();
658 MethodSymbol enclMethod =
659 (c.owner.type == null // local to init block
660 || c.owner.kind != MTH) // or member init
661 ? null
662 : (MethodSymbol)c.owner;
663 databuf.appendChar(pool.put(enclClass));
664 databuf.appendChar(enclMethod == null ? 0 : pool.put(nameType(c.owner)));
665 endAttr(alenIdx);
666 return 1;
667 }
668
669 /** Write flag attributes; return number of attributes written.
670 */
671 int writeFlagAttrs(long flags) {
672 int acount = 0;
673 if ((flags & DEPRECATED) != 0) {
674 int alenIdx = writeAttr(names.Deprecated);
675 endAttr(alenIdx);
676 acount++;
677 }
678 if ((flags & ENUM) != 0 && !target.useEnumFlag()) {
679 int alenIdx = writeAttr(names.Enum);
680 endAttr(alenIdx);
681 acount++;
682 }
683 if ((flags & SYNTHETIC) != 0 && !target.useSyntheticFlag()) {
684 int alenIdx = writeAttr(names.Synthetic);
685 endAttr(alenIdx);
686 acount++;
687 }
688 if ((flags & BRIDGE) != 0 && !target.useBridgeFlag()) {
689 int alenIdx = writeAttr(names.Bridge);
690 endAttr(alenIdx);
691 acount++;
692 }
693 if ((flags & VARARGS) != 0 && !target.useVarargsFlag()) {
694 int alenIdx = writeAttr(names.Varargs);
695 endAttr(alenIdx);
696 acount++;
697 }
698 if ((flags & ANNOTATION) != 0 && !target.useAnnotationFlag()) {
699 int alenIdx = writeAttr(names.Annotation);
700 endAttr(alenIdx);
701 acount++;
702 }
703 return acount;
704 }
705
706 /** Write member (field or method) attributes;
707 * return number of attributes written.
708 */
709 int writeMemberAttrs(Symbol sym) {
710 int acount = writeFlagAttrs(sym.flags());
711 long flags = sym.flags();
712 if (source.allowGenerics() &&
713 (flags & (SYNTHETIC|BRIDGE)) != SYNTHETIC &&
714 (flags & ANONCONSTR) == 0 &&
715 (!types.isSameType(sym.type, sym.erasure(types)) ||
716 hasTypeVar(sym.type.getThrownTypes()))) {
717 // note that a local class with captured variables
718 // will get a signature attribute
719 int alenIdx = writeAttr(names.Signature);
720 databuf.appendChar(pool.put(typeSig(sym.type)));
721 endAttr(alenIdx);
722 acount++;
723 }
724 acount += writeJavaAnnotations(sym.getRawAttributes());
725 acount += writeTypeAnnotations(sym.getRawTypeAttributes());
726 return acount;
727 }
728
729 /**
730 * Write method parameter names attribute.
731 */
732 int writeMethodParametersAttr(MethodSymbol m) {
733 MethodType ty = m.externalType(types).asMethodType();
734 final int allparams = ty.argtypes.size();
735 if (m.params != null && allparams != 0) {
736 final int attrIndex = writeAttr(names.MethodParameters);
737 databuf.appendByte(allparams);
738 // Write extra parameters first
739 for (VarSymbol s : m.extraParams) {
740 final int flags =
741 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
742 ((int) m.flags() & SYNTHETIC);
743 databuf.appendChar(pool.put(s.name));
744 databuf.appendInt(flags);
745 }
746 // Now write the real parameters
747 for (VarSymbol s : m.params) {
748 final int flags =
749 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
750 ((int) m.flags() & SYNTHETIC);
751 databuf.appendChar(pool.put(s.name));
752 databuf.appendInt(flags);
753 }
754 endAttr(attrIndex);
755 return 1;
756 } else
757 return 0;
758 }
759
760
761 /** Write method parameter annotations;
762 * return number of attributes written.
763 */
764 int writeParameterAttrs(MethodSymbol m) {
765 boolean hasVisible = false;
766 boolean hasInvisible = false;
767 if (m.params != null) for (VarSymbol s : m.params) {
768 for (Attribute.Compound a : s.getRawAttributes()) {
769 switch (types.getRetention(a)) {
770 case SOURCE: break;
771 case CLASS: hasInvisible = true; break;
772 case RUNTIME: hasVisible = true; break;
773 default: ;// /* fail soft */ throw new AssertionError(vis);
774 }
775 }
776 }
777
778 int attrCount = 0;
779 if (hasVisible) {
780 int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations);
781 databuf.appendByte(m.params.length());
782 for (VarSymbol s : m.params) {
783 ListBuffer<Attribute.Compound> buf = new ListBuffer<Attribute.Compound>();
784 for (Attribute.Compound a : s.getRawAttributes())
785 if (types.getRetention(a) == RetentionPolicy.RUNTIME)
786 buf.append(a);
787 databuf.appendChar(buf.length());
788 for (Attribute.Compound a : buf)
789 writeCompoundAttribute(a);
790 }
791 endAttr(attrIndex);
792 attrCount++;
793 }
794 if (hasInvisible) {
795 int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations);
796 databuf.appendByte(m.params.length());
797 for (VarSymbol s : m.params) {
798 ListBuffer<Attribute.Compound> buf = new ListBuffer<Attribute.Compound>();
799 for (Attribute.Compound a : s.getRawAttributes())
800 if (types.getRetention(a) == RetentionPolicy.CLASS)
801 buf.append(a);
802 databuf.appendChar(buf.length());
803 for (Attribute.Compound a : buf)
804 writeCompoundAttribute(a);
805 }
806 endAttr(attrIndex);
807 attrCount++;
808 }
809 return attrCount;
810 }
811
812 /**********************************************************************
813 * Writing Java-language annotations (aka metadata, attributes)
814 **********************************************************************/
815
816 /** Write Java-language annotations; return number of JVM
817 * attributes written (zero or one).
818 */
819 int writeJavaAnnotations(List<Attribute.Compound> attrs) {
820 if (attrs.isEmpty()) return 0;
821 ListBuffer<Attribute.Compound> visibles = new ListBuffer<Attribute.Compound>();
822 ListBuffer<Attribute.Compound> invisibles = new ListBuffer<Attribute.Compound>();
823 for (Attribute.Compound a : attrs) {
824 switch (types.getRetention(a)) {
825 case SOURCE: break;
826 case CLASS: invisibles.append(a); break;
827 case RUNTIME: visibles.append(a); break;
828 default: ;// /* fail soft */ throw new AssertionError(vis);
829 }
830 }
831
832 int attrCount = 0;
833 if (visibles.length() != 0) {
834 int attrIndex = writeAttr(names.RuntimeVisibleAnnotations);
835 databuf.appendChar(visibles.length());
836 for (Attribute.Compound a : visibles)
837 writeCompoundAttribute(a);
838 endAttr(attrIndex);
839 attrCount++;
840 }
841 if (invisibles.length() != 0) {
842 int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations);
843 databuf.appendChar(invisibles.length());
844 for (Attribute.Compound a : invisibles)
845 writeCompoundAttribute(a);
846 endAttr(attrIndex);
847 attrCount++;
848 }
849 return attrCount;
850 }
851
852 int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos) {
853 if (typeAnnos.isEmpty()) return 0;
854
855 ListBuffer<Attribute.TypeCompound> visibles = ListBuffer.lb();
856 ListBuffer<Attribute.TypeCompound> invisibles = ListBuffer.lb();
857
858 for (Attribute.TypeCompound tc : typeAnnos) {
859 if (tc.position == null || tc.position.type == TargetType.UNKNOWN) {
860 boolean found = false;
861 // TODO: the position for the container annotation of a
862 // repeating type annotation has to be set.
863 // This cannot be done when the container is created, because
864 // then the position is not determined yet.
865 // How can we link these pieces better together?
866 if (tc.values.size() == 1) {
867 Pair<MethodSymbol, Attribute> val = tc.values.get(0);
868 if (val.fst.getSimpleName().contentEquals("value") &&
869 val.snd instanceof Attribute.Array) {
870 Attribute.Array arr = (Attribute.Array) val.snd;
871 if (arr.values.length != 0 &&
872 arr.values[0] instanceof Attribute.TypeCompound) {
873 TypeCompound atycomp = (Attribute.TypeCompound) arr.values[0];
874 if (atycomp.position.type != TargetType.UNKNOWN) {
875 tc.position = atycomp.position;
876 found = true;
877 }
878 }
879 }
880 }
881 if (!found) {
882 // This happens for nested types like @A Outer. @B Inner.
883 // For method parameters we get the annotation twice! Once with
884 // a valid position, once unknown.
885 // TODO: find a cleaner solution.
886 // System.err.println("ClassWriter: Position UNKNOWN in type annotation: " + tc);
887 continue;
888 }
889 }
890 if (!tc.position.emitToClassfile())
891 continue;
892 switch (types.getRetention(tc)) {
893 case SOURCE: break;
894 case CLASS: invisibles.append(tc); break;
895 case RUNTIME: visibles.append(tc); break;
896 default: ;// /* fail soft */ throw new AssertionError(vis);
897 }
898 }
899
900 int attrCount = 0;
901 if (visibles.length() != 0) {
902 int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations);
903 databuf.appendChar(visibles.length());
904 for (Attribute.TypeCompound p : visibles)
905 writeTypeAnnotation(p);
906 endAttr(attrIndex);
907 attrCount++;
908 }
909
910 if (invisibles.length() != 0) {
911 int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations);
912 databuf.appendChar(invisibles.length());
913 for (Attribute.TypeCompound p : invisibles)
914 writeTypeAnnotation(p);
915 endAttr(attrIndex);
916 attrCount++;
917 }
918
919 return attrCount;
920 }
921
922 /** A visitor to write an attribute including its leading
923 * single-character marker.
924 */
925 class AttributeWriter implements Attribute.Visitor {
926 public void visitConstant(Attribute.Constant _value) {
927 Object value = _value.value;
928 switch (_value.type.getTag()) {
929 case BYTE:
930 databuf.appendByte('B');
931 break;
932 case CHAR:
933 databuf.appendByte('C');
934 break;
935 case SHORT:
936 databuf.appendByte('S');
937 break;
938 case INT:
939 databuf.appendByte('I');
940 break;
941 case LONG:
942 databuf.appendByte('J');
943 break;
944 case FLOAT:
945 databuf.appendByte('F');
946 break;
947 case DOUBLE:
948 databuf.appendByte('D');
949 break;
950 case BOOLEAN:
951 databuf.appendByte('Z');
952 break;
953 case CLASS:
954 Assert.check(value instanceof String);
955 databuf.appendByte('s');
956 value = names.fromString(value.toString()); // CONSTANT_Utf8
957 break;
958 default:
959 throw new AssertionError(_value.type);
960 }
961 databuf.appendChar(pool.put(value));
962 }
963 public void visitEnum(Attribute.Enum e) {
964 databuf.appendByte('e');
965 databuf.appendChar(pool.put(typeSig(e.value.type)));
966 databuf.appendChar(pool.put(e.value.name));
967 }
968 public void visitClass(Attribute.Class clazz) {
969 databuf.appendByte('c');
970 databuf.appendChar(pool.put(typeSig(clazz.classType)));
971 }
972 public void visitCompound(Attribute.Compound compound) {
973 databuf.appendByte('@');
974 writeCompoundAttribute(compound);
975 }
976 public void visitError(Attribute.Error x) {
977 throw new AssertionError(x);
978 }
979 public void visitArray(Attribute.Array array) {
980 databuf.appendByte('[');
981 databuf.appendChar(array.values.length);
982 for (Attribute a : array.values) {
983 a.accept(this);
984 }
985 }
986 }
987 AttributeWriter awriter = new AttributeWriter();
988
989 /** Write a compound attribute excluding the '@' marker. */
990 void writeCompoundAttribute(Attribute.Compound c) {
991 databuf.appendChar(pool.put(typeSig(c.type)));
992 databuf.appendChar(c.values.length());
993 for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) {
994 databuf.appendChar(pool.put(p.fst.name));
995 p.snd.accept(awriter);
996 }
997 }
998
999 void writeTypeAnnotation(Attribute.TypeCompound c) {
1000 writePosition(c.position);
1001 writeCompoundAttribute(c);
1002 }
1003
1004 void writePosition(TypeAnnotationPosition p) {
1005 databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte
1006 switch (p.type) {
1007 // type cast
1008 case CAST:
1009 // instanceof
1010 case INSTANCEOF:
1011 // new expression
1012 case NEW:
1013 databuf.appendChar(p.offset);
1014 break;
1015 // local variable
1016 case LOCAL_VARIABLE:
1017 // resource variable
1018 case RESOURCE_VARIABLE:
1019 databuf.appendChar(p.lvarOffset.length); // for table length
1020 for (int i = 0; i < p.lvarOffset.length; ++i) {
1021 databuf.appendChar(p.lvarOffset[i]);
1022 databuf.appendChar(p.lvarLength[i]);
1023 databuf.appendChar(p.lvarIndex[i]);
1024 }
1025 break;
1026 // exception parameter
1027 case EXCEPTION_PARAMETER:
1028 databuf.appendByte(p.exception_index);
1029 break;
1030 // method receiver
1031 case METHOD_RECEIVER:
1032 // Do nothing
1033 break;
1034 // type parameter
1035 case CLASS_TYPE_PARAMETER:
1036 case METHOD_TYPE_PARAMETER:
1037 databuf.appendByte(p.parameter_index);
1038 break;
1039 // type parameter bound
1040 case CLASS_TYPE_PARAMETER_BOUND:
1041 case METHOD_TYPE_PARAMETER_BOUND:
1042 databuf.appendByte(p.parameter_index);
1043 databuf.appendByte(p.bound_index);
1044 break;
1045 // class extends or implements clause
1046 case CLASS_EXTENDS:
1047 databuf.appendChar(p.type_index);
1048 break;
1049 // throws
1050 case THROWS:
1051 databuf.appendChar(p.type_index);
1052 break;
1053 // method parameter
1054 case METHOD_FORMAL_PARAMETER:
1055 databuf.appendByte(p.parameter_index);
1056 break;
1057 // method/constructor/reference type argument
1058 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT:
1059 case METHOD_INVOCATION_TYPE_ARGUMENT:
1060 case METHOD_REFERENCE_TYPE_ARGUMENT:
1061 databuf.appendChar(p.offset);
1062 databuf.appendByte(p.type_index);
1063 break;
1064 // We don't need to worry about these
1065 case METHOD_RETURN:
1066 case FIELD:
1067 break;
1068 // lambda formal parameter
1069 case LAMBDA_FORMAL_PARAMETER:
1070 databuf.appendByte(p.parameter_index);
1071 break;
1072 case UNKNOWN:
1073 throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!");
1074 default:
1075 throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p);
1076 }
1077
1078 { // Append location data for generics/arrays.
1079 databuf.appendByte(p.location.size());
1080 java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location);
1081 for (int i : loc)
1082 databuf.appendByte((byte)i);
1083 }
1084 }
1085
1086 /**********************************************************************
1087 * Writing Objects
1088 **********************************************************************/
1089
1090 /** Enter an inner class into the `innerClasses' set/queue.
1091 */
1092 void enterInner(ClassSymbol c) {
1093 if (c.type.isCompound()) {
1094 throw new AssertionError("Unexpected intersection type: " + c.type);
1095 }
1096 try {
1097 c.complete();
1098 } catch (CompletionFailure ex) {
1099 System.err.println("error: " + c + ": " + ex.getMessage());
1100 throw ex;
1101 }
1102 if (!c.type.hasTag(CLASS)) return; // arrays
1103 if (pool != null && // pool might be null if called from xClassName
1104 c.owner.enclClass() != null &&
1105 (innerClasses == null || !innerClasses.contains(c))) {
1106 // log.errWriter.println("enter inner " + c);//DEBUG
1107 enterInner(c.owner.enclClass());
1108 pool.put(c);
1109 pool.put(c.name);
1110 if (innerClasses == null) {
1111 innerClasses = new HashSet<ClassSymbol>();
1112 innerClassesQueue = new ListBuffer<ClassSymbol>();
1113 pool.put(names.InnerClasses);
1114 }
1115 innerClasses.add(c);
1116 innerClassesQueue.append(c);
1117 }
1118 }
1119
1120 /** Write "inner classes" attribute.
1121 */
1122 void writeInnerClasses() {
1123 int alenIdx = writeAttr(names.InnerClasses);
1124 databuf.appendChar(innerClassesQueue.length());
1125 for (List<ClassSymbol> l = innerClassesQueue.toList();
1126 l.nonEmpty();
1127 l = l.tail) {
1128 ClassSymbol inner = l.head;
1129 char flags = (char) adjustFlags(inner.flags_field);
1130 if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT
1131 if (inner.name.isEmpty()) flags &= ~FINAL; // Anonymous class: unset FINAL flag
1132 if (dumpInnerClassModifiers) {
1133 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1134 pw.println("INNERCLASS " + inner.name);
1135 pw.println("---" + flagNames(flags));
1136 }
1137 databuf.appendChar(pool.get(inner));
1138 databuf.appendChar(
1139 inner.owner.kind == TYP ? pool.get(inner.owner) : 0);
1140 databuf.appendChar(
1141 !inner.name.isEmpty() ? pool.get(inner.name) : 0);
1142 databuf.appendChar(flags);
1143 }
1144 endAttr(alenIdx);
1145 }
1146
1147 /** Write "bootstrapMethods" attribute.
1148 */
1149 void writeBootstrapMethods() {
1150 int alenIdx = writeAttr(names.BootstrapMethods);
1151 databuf.appendChar(bootstrapMethods.size());
1152 for (Map.Entry<DynamicMethod, MethodHandle> entry : bootstrapMethods.entrySet()) {
1153 DynamicMethod dmeth = entry.getKey();
1154 DynamicMethodSymbol dsym = (DynamicMethodSymbol)dmeth.baseSymbol();
1155 //write BSM handle
1156 databuf.appendChar(pool.get(entry.getValue()));
1157 //write static args length
1158 databuf.appendChar(dsym.staticArgs.length);
1159 //write static args array
1160 Object[] uniqueArgs = dmeth.uniqueStaticArgs;
1161 for (Object o : uniqueArgs) {
1162 databuf.appendChar(pool.get(o));
1163 }
1164 }
1165 endAttr(alenIdx);
1166 }
1167
1168 /** Write field symbol, entering all references into constant pool.
1169 */
1170 void writeField(VarSymbol v) {
1171 int flags = adjustFlags(v.flags());
1172 databuf.appendChar(flags);
1173 if (dumpFieldModifiers) {
1174 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1175 pw.println("FIELD " + fieldName(v));
1176 pw.println("---" + flagNames(v.flags()));
1177 }
1178 databuf.appendChar(pool.put(fieldName(v)));
1179 databuf.appendChar(pool.put(typeSig(v.erasure(types))));
1180 int acountIdx = beginAttrs();
1181 int acount = 0;
1182 if (v.getConstValue() != null) {
1183 int alenIdx = writeAttr(names.ConstantValue);
1184 databuf.appendChar(pool.put(v.getConstValue()));
1185 endAttr(alenIdx);
1186 acount++;
1187 }
1188 acount += writeMemberAttrs(v);
1189 endAttrs(acountIdx, acount);
1190 }
1191
1192 /** Write method symbol, entering all references into constant pool.
1193 */
1194 void writeMethod(MethodSymbol m) {
1195 int flags = adjustFlags(m.flags());
1196 databuf.appendChar(flags);
1197 if (dumpMethodModifiers) {
1198 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1199 pw.println("METHOD " + fieldName(m));
1200 pw.println("---" + flagNames(m.flags()));
1201 }
1202 databuf.appendChar(pool.put(fieldName(m)));
1203 databuf.appendChar(pool.put(typeSig(m.externalType(types))));
1204 int acountIdx = beginAttrs();
1205 int acount = 0;
1206 if (m.code != null) {
1207 int alenIdx = writeAttr(names.Code);
1208 writeCode(m.code);
1209 m.code = null; // to conserve space
1210 endAttr(alenIdx);
1211 acount++;
1212 }
1213 List<Type> thrown = m.erasure(types).getThrownTypes();
1214 if (thrown.nonEmpty()) {
1215 int alenIdx = writeAttr(names.Exceptions);
1216 databuf.appendChar(thrown.length());
1217 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1218 databuf.appendChar(pool.put(l.head.tsym));
1219 endAttr(alenIdx);
1220 acount++;
1221 }
1222 if (m.defaultValue != null) {
1223 int alenIdx = writeAttr(names.AnnotationDefault);
1224 m.defaultValue.accept(awriter);
1225 endAttr(alenIdx);
1226 acount++;
1227 }
1228 if (options.isSet(PARAMETERS))
1229 acount += writeMethodParametersAttr(m);
1230 acount += writeMemberAttrs(m);
1231 acount += writeParameterAttrs(m);
1232 endAttrs(acountIdx, acount);
1233 }
1234
1235 /** Write code attribute of method.
1236 */
1237 void writeCode(Code code) {
1238 databuf.appendChar(code.max_stack);
1239 databuf.appendChar(code.max_locals);
1240 databuf.appendInt(code.cp);
1241 databuf.appendBytes(code.code, 0, code.cp);
1242 databuf.appendChar(code.catchInfo.length());
1243 for (List<char[]> l = code.catchInfo.toList();
1244 l.nonEmpty();
1245 l = l.tail) {
1246 for (int i = 0; i < l.head.length; i++)
1247 databuf.appendChar(l.head[i]);
1248 }
1249 int acountIdx = beginAttrs();
1250 int acount = 0;
1251
1252 if (code.lineInfo.nonEmpty()) {
1253 int alenIdx = writeAttr(names.LineNumberTable);
1254 databuf.appendChar(code.lineInfo.length());
1255 for (List<char[]> l = code.lineInfo.reverse();
1256 l.nonEmpty();
1257 l = l.tail)
1258 for (int i = 0; i < l.head.length; i++)
1259 databuf.appendChar(l.head[i]);
1260 endAttr(alenIdx);
1261 acount++;
1262 }
1263
1264 if (genCrt && (code.crt != null)) {
1265 CRTable crt = code.crt;
1266 int alenIdx = writeAttr(names.CharacterRangeTable);
1267 int crtIdx = beginAttrs();
1268 int crtEntries = crt.writeCRT(databuf, code.lineMap, log);
1269 endAttrs(crtIdx, crtEntries);
1270 endAttr(alenIdx);
1271 acount++;
1272 }
1273
1274 // counter for number of generic local variables
1275 int nGenericVars = 0;
1276
1277 if (code.varBufferSize > 0) {
1278 int alenIdx = writeAttr(names.LocalVariableTable);
1279 databuf.appendChar(code.varBufferSize);
1280
1281 for (int i=0; i<code.varBufferSize; i++) {
1282 Code.LocalVar var = code.varBuffer[i];
1283
1284 // write variable info
1285 Assert.check(var.start_pc >= 0
1286 && var.start_pc <= code.cp);
1287 databuf.appendChar(var.start_pc);
1288 Assert.check(var.length >= 0
1289 && (var.start_pc + var.length) <= code.cp);
1290 databuf.appendChar(var.length);
1291 VarSymbol sym = var.sym;
1292 databuf.appendChar(pool.put(sym.name));
1293 Type vartype = sym.erasure(types);
1294 if (needsLocalVariableTypeEntry(sym.type))
1295 nGenericVars++;
1296 databuf.appendChar(pool.put(typeSig(vartype)));
1297 databuf.appendChar(var.reg);
1298 }
1299 endAttr(alenIdx);
1300 acount++;
1301 }
1302
1303 if (nGenericVars > 0) {
1304 int alenIdx = writeAttr(names.LocalVariableTypeTable);
1305 databuf.appendChar(nGenericVars);
1306 int count = 0;
1307
1308 for (int i=0; i<code.varBufferSize; i++) {
1309 Code.LocalVar var = code.varBuffer[i];
1310 VarSymbol sym = var.sym;
1311 if (!needsLocalVariableTypeEntry(sym.type))
1312 continue;
1313 count++;
1314 // write variable info
1315 databuf.appendChar(var.start_pc);
1316 databuf.appendChar(var.length);
1317 databuf.appendChar(pool.put(sym.name));
1318 databuf.appendChar(pool.put(typeSig(sym.type)));
1319 databuf.appendChar(var.reg);
1320 }
1321 Assert.check(count == nGenericVars);
1322 endAttr(alenIdx);
1323 acount++;
1324 }
1325
1326 if (code.stackMapBufferSize > 0) {
1327 if (debugstackmap) System.out.println("Stack map for " + code.meth);
1328 int alenIdx = writeAttr(code.stackMap.getAttributeName(names));
1329 writeStackMap(code);
1330 endAttr(alenIdx);
1331 acount++;
1332 }
1333 endAttrs(acountIdx, acount);
1334 }
1335 //where
1336 private boolean needsLocalVariableTypeEntry(Type t) {
1337 //a local variable needs a type-entry if its type T is generic
1338 //(i.e. |T| != T) and if it's not an intersection type (not supported
1339 //in signature attribute grammar)
1340 return (!types.isSameType(t, types.erasure(t)) &&
1341 !t.isCompound());
1342 }
1343
1344 void writeStackMap(Code code) {
1345 int nframes = code.stackMapBufferSize;
1346 if (debugstackmap) System.out.println(" nframes = " + nframes);
1347 databuf.appendChar(nframes);
1348
1349 switch (code.stackMap) {
1350 case CLDC:
1351 for (int i=0; i<nframes; i++) {
1352 if (debugstackmap) System.out.print(" " + i + ":");
1353 Code.StackMapFrame frame = code.stackMapBuffer[i];
1354
1355 // output PC
1356 if (debugstackmap) System.out.print(" pc=" + frame.pc);
1357 databuf.appendChar(frame.pc);
1358
1359 // output locals
1360 int localCount = 0;
1361 for (int j=0; j<frame.locals.length;
1362 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.locals[j]))) {
1363 localCount++;
1364 }
1365 if (debugstackmap) System.out.print(" nlocals=" +
1366 localCount);
1367 databuf.appendChar(localCount);
1368 for (int j=0; j<frame.locals.length;
1369 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.locals[j]))) {
1370 if (debugstackmap) System.out.print(" local[" + j + "]=");
1371 writeStackMapType(frame.locals[j]);
1372 }
1373
1374 // output stack
1375 int stackCount = 0;
1376 for (int j=0; j<frame.stack.length;
1377 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.stack[j]))) {
1378 stackCount++;
1379 }
1380 if (debugstackmap) System.out.print(" nstack=" +
1381 stackCount);
1382 databuf.appendChar(stackCount);
1383 for (int j=0; j<frame.stack.length;
1384 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.stack[j]))) {
1385 if (debugstackmap) System.out.print(" stack[" + j + "]=");
1386 writeStackMapType(frame.stack[j]);
1387 }
1388 if (debugstackmap) System.out.println();
1389 }
1390 break;
1391 case JSR202: {
1392 Assert.checkNull(code.stackMapBuffer);
1393 for (int i=0; i<nframes; i++) {
1394 if (debugstackmap) System.out.print(" " + i + ":");
1395 StackMapTableFrame frame = code.stackMapTableBuffer[i];
1396 frame.write(this);
1397 if (debugstackmap) System.out.println();
1398 }
1399 break;
1400 }
1401 default:
1402 throw new AssertionError("Unexpected stackmap format value");
1403 }
1404 }
1405
1406 //where
1407 void writeStackMapType(Type t) {
1408 if (t == null) {
1409 if (debugstackmap) System.out.print("empty");
1410 databuf.appendByte(0);
1411 }
1412 else switch(t.getTag()) {
1413 case BYTE:
1414 case CHAR:
1415 case SHORT:
1416 case INT:
1417 case BOOLEAN:
1418 if (debugstackmap) System.out.print("int");
1419 databuf.appendByte(1);
1420 break;
1421 case FLOAT:
1422 if (debugstackmap) System.out.print("float");
1423 databuf.appendByte(2);
1424 break;
1425 case DOUBLE:
1426 if (debugstackmap) System.out.print("double");
1427 databuf.appendByte(3);
1428 break;
1429 case LONG:
1430 if (debugstackmap) System.out.print("long");
1431 databuf.appendByte(4);
1432 break;
1433 case BOT: // null
1434 if (debugstackmap) System.out.print("null");
1435 databuf.appendByte(5);
1436 break;
1437 case CLASS:
1438 case ARRAY:
1439 if (debugstackmap) System.out.print("object(" + t + ")");
1440 databuf.appendByte(7);
1441 databuf.appendChar(pool.put(t));
1442 break;
1443 case TYPEVAR:
1444 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")");
1445 databuf.appendByte(7);
1446 databuf.appendChar(pool.put(types.erasure(t).tsym));
1447 break;
1448 case UNINITIALIZED_THIS:
1449 if (debugstackmap) System.out.print("uninit_this");
1450 databuf.appendByte(6);
1451 break;
1452 case UNINITIALIZED_OBJECT:
1453 { UninitializedType uninitType = (UninitializedType)t;
1454 databuf.appendByte(8);
1455 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset);
1456 databuf.appendChar(uninitType.offset);
1457 }
1458 break;
1459 default:
1460 throw new AssertionError();
1461 }
1462 }
1463
1464 /** An entry in the JSR202 StackMapTable */
1465 abstract static class StackMapTableFrame {
1466 abstract int getFrameType();
1467
1468 void write(ClassWriter writer) {
1469 int frameType = getFrameType();
1470 writer.databuf.appendByte(frameType);
1471 if (writer.debugstackmap) System.out.print(" frame_type=" + frameType);
1472 }
1473
1474 static class SameFrame extends StackMapTableFrame {
1475 final int offsetDelta;
1476 SameFrame(int offsetDelta) {
1477 this.offsetDelta = offsetDelta;
1478 }
1479 int getFrameType() {
1480 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED;
1481 }
1482 @Override
1483 void write(ClassWriter writer) {
1484 super.write(writer);
1485 if (getFrameType() == SAME_FRAME_EXTENDED) {
1486 writer.databuf.appendChar(offsetDelta);
1487 if (writer.debugstackmap){
1488 System.out.print(" offset_delta=" + offsetDelta);
1489 }
1490 }
1491 }
1492 }
1493
1494 static class SameLocals1StackItemFrame extends StackMapTableFrame {
1495 final int offsetDelta;
1496 final Type stack;
1497 SameLocals1StackItemFrame(int offsetDelta, Type stack) {
1498 this.offsetDelta = offsetDelta;
1499 this.stack = stack;
1500 }
1501 int getFrameType() {
1502 return (offsetDelta < SAME_FRAME_SIZE) ?
1503 (SAME_FRAME_SIZE + offsetDelta) :
1504 SAME_LOCALS_1_STACK_ITEM_EXTENDED;
1505 }
1506 @Override
1507 void write(ClassWriter writer) {
1508 super.write(writer);
1509 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
1510 writer.databuf.appendChar(offsetDelta);
1511 if (writer.debugstackmap) {
1512 System.out.print(" offset_delta=" + offsetDelta);
1513 }
1514 }
1515 if (writer.debugstackmap) {
1516 System.out.print(" stack[" + 0 + "]=");
1517 }
1518 writer.writeStackMapType(stack);
1519 }
1520 }
1521
1522 static class ChopFrame extends StackMapTableFrame {
1523 final int frameType;
1524 final int offsetDelta;
1525 ChopFrame(int frameType, int offsetDelta) {
1526 this.frameType = frameType;
1527 this.offsetDelta = offsetDelta;
1528 }
1529 int getFrameType() { return frameType; }
1530 @Override
1531 void write(ClassWriter writer) {
1532 super.write(writer);
1533 writer.databuf.appendChar(offsetDelta);
1534 if (writer.debugstackmap) {
1535 System.out.print(" offset_delta=" + offsetDelta);
1536 }
1537 }
1538 }
1539
1540 static class AppendFrame extends StackMapTableFrame {
1541 final int frameType;
1542 final int offsetDelta;
1543 final Type[] locals;
1544 AppendFrame(int frameType, int offsetDelta, Type[] locals) {
1545 this.frameType = frameType;
1546 this.offsetDelta = offsetDelta;
1547 this.locals = locals;
1548 }
1549 int getFrameType() { return frameType; }
1550 @Override
1551 void write(ClassWriter writer) {
1552 super.write(writer);
1553 writer.databuf.appendChar(offsetDelta);
1554 if (writer.debugstackmap) {
1555 System.out.print(" offset_delta=" + offsetDelta);
1556 }
1557 for (int i=0; i<locals.length; i++) {
1558 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1559 writer.writeStackMapType(locals[i]);
1560 }
1561 }
1562 }
1563
1564 static class FullFrame extends StackMapTableFrame {
1565 final int offsetDelta;
1566 final Type[] locals;
1567 final Type[] stack;
1568 FullFrame(int offsetDelta, Type[] locals, Type[] stack) {
1569 this.offsetDelta = offsetDelta;
1570 this.locals = locals;
1571 this.stack = stack;
1572 }
1573 int getFrameType() { return FULL_FRAME; }
1574 @Override
1575 void write(ClassWriter writer) {
1576 super.write(writer);
1577 writer.databuf.appendChar(offsetDelta);
1578 writer.databuf.appendChar(locals.length);
1579 if (writer.debugstackmap) {
1580 System.out.print(" offset_delta=" + offsetDelta);
1581 System.out.print(" nlocals=" + locals.length);
1582 }
1583 for (int i=0; i<locals.length; i++) {
1584 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1585 writer.writeStackMapType(locals[i]);
1586 }
1587
1588 writer.databuf.appendChar(stack.length);
1589 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); }
1590 for (int i=0; i<stack.length; i++) {
1591 if (writer.debugstackmap) System.out.print(" stack[" + i + "]=");
1592 writer.writeStackMapType(stack[i]);
1593 }
1594 }
1595 }
1596
1597 /** Compare this frame with the previous frame and produce
1598 * an entry of compressed stack map frame. */
1599 static StackMapTableFrame getInstance(Code.StackMapFrame this_frame,
1600 int prev_pc,
1601 Type[] prev_locals,
1602 Types types) {
1603 Type[] locals = this_frame.locals;
1604 Type[] stack = this_frame.stack;
1605 int offset_delta = this_frame.pc - prev_pc - 1;
1606 if (stack.length == 1) {
1607 if (locals.length == prev_locals.length
1608 && compare(prev_locals, locals, types) == 0) {
1609 return new SameLocals1StackItemFrame(offset_delta, stack[0]);
1610 }
1611 } else if (stack.length == 0) {
1612 int diff_length = compare(prev_locals, locals, types);
1613 if (diff_length == 0) {
1614 return new SameFrame(offset_delta);
1615 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) {
1616 // APPEND
1617 Type[] local_diff = new Type[-diff_length];
1618 for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) {
1619 local_diff[j] = locals[i];
1620 }
1621 return new AppendFrame(SAME_FRAME_EXTENDED - diff_length,
1622 offset_delta,
1623 local_diff);
1624 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) {
1625 // CHOP
1626 return new ChopFrame(SAME_FRAME_EXTENDED - diff_length,
1627 offset_delta);
1628 }
1629 }
1630 // FULL_FRAME
1631 return new FullFrame(offset_delta, locals, stack);
1632 }
1633
1634 static boolean isInt(Type t) {
1635 return (t.getTag().isStrictSubRangeOf(INT) || t.hasTag(BOOLEAN));
1636 }
1637
1638 static boolean isSameType(Type t1, Type t2, Types types) {
1639 if (t1 == null) { return t2 == null; }
1640 if (t2 == null) { return false; }
1641
1642 if (isInt(t1) && isInt(t2)) { return true; }
1643
1644 if (t1.hasTag(UNINITIALIZED_THIS)) {
1645 return t2.hasTag(UNINITIALIZED_THIS);
1646 } else if (t1.hasTag(UNINITIALIZED_OBJECT)) {
1647 if (t2.hasTag(UNINITIALIZED_OBJECT)) {
1648 return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset;
1649 } else {
1650 return false;
1651 }
1652 } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) {
1653 return false;
1654 }
1655
1656 return types.isSameType(t1, t2);
1657 }
1658
1659 static int compare(Type[] arr1, Type[] arr2, Types types) {
1660 int diff_length = arr1.length - arr2.length;
1661 if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) {
1662 return Integer.MAX_VALUE;
1663 }
1664 int len = (diff_length > 0) ? arr2.length : arr1.length;
1665 for (int i=0; i<len; i++) {
1666 if (!isSameType(arr1[i], arr2[i], types)) {
1667 return Integer.MAX_VALUE;
1668 }
1669 }
1670 return diff_length;
1671 }
1672 }
1673
1674 void writeFields(Scope.Entry e) {
1675 // process them in reverse sibling order;
1676 // i.e., process them in declaration order.
1677 List<VarSymbol> vars = List.nil();
1678 for (Scope.Entry i = e; i != null; i = i.sibling) {
1679 if (i.sym.kind == VAR) vars = vars.prepend((VarSymbol)i.sym);
1680 }
1681 while (vars.nonEmpty()) {
1682 writeField(vars.head);
1683 vars = vars.tail;
1684 }
1685 }
1686
1687 void writeMethods(Scope.Entry e) {
1688 List<MethodSymbol> methods = List.nil();
1689 for (Scope.Entry i = e; i != null; i = i.sibling) {
1690 if (i.sym.kind == MTH && (i.sym.flags() & HYPOTHETICAL) == 0)
1691 methods = methods.prepend((MethodSymbol)i.sym);
1692 }
1693 while (methods.nonEmpty()) {
1694 writeMethod(methods.head);
1695 methods = methods.tail;
1696 }
1697 }
1698
1699 /** Emit a class file for a given class.
1700 * @param c The class from which a class file is generated.
1701 */
1702 public JavaFileObject writeClass(ClassSymbol c)
1703 throws IOException, PoolOverflow, StringOverflow
1704 {
1705 JavaFileObject outFile
1706 = fileManager.getJavaFileForOutput(CLASS_OUTPUT,
1707 c.flatname.toString(),
1708 JavaFileObject.Kind.CLASS,
1709 c.sourcefile);
1710 OutputStream out = outFile.openOutputStream();
1711 try {
1712 writeClassFile(out, c);
1713 if (verbose)
1714 log.printVerbose("wrote.file", outFile);
1715 out.close();
1716 out = null;
1717 } finally {
1718 if (out != null) {
1719 // if we are propogating an exception, delete the file
1720 out.close();
1721 outFile.delete();
1722 outFile = null;
1723 }
1724 }
1725 return outFile; // may be null if write failed
1726 }
1727
1728 /** Write class `c' to outstream `out'.
1729 */
1730 public void writeClassFile(OutputStream out, ClassSymbol c)
1731 throws IOException, PoolOverflow, StringOverflow {
1732 Assert.check((c.flags() & COMPOUND) == 0);
1733 databuf.reset();
1734 poolbuf.reset();
1735 sigbuf.reset();
1736 pool = c.pool;
1737 innerClasses = null;
1738 innerClassesQueue = null;
1739 bootstrapMethods = new LinkedHashMap<DynamicMethod, MethodHandle>();
1740
1741 Type supertype = types.supertype(c.type);
1742 List<Type> interfaces = types.interfaces(c.type);
1743 List<Type> typarams = c.type.getTypeArguments();
1744
1745 int flags = adjustFlags(c.flags() & ~DEFAULT);
1746 if ((flags & PROTECTED) != 0) flags |= PUBLIC;
1747 flags = flags & ClassFlags & ~STRICTFP;
1748 if ((flags & INTERFACE) == 0) flags |= ACC_SUPER;
1749 if (c.isInner() && c.name.isEmpty()) flags &= ~FINAL;
1750 if (dumpClassModifiers) {
1751 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1752 pw.println();
1753 pw.println("CLASSFILE " + c.getQualifiedName());
1754 pw.println("---" + flagNames(flags));
1755 }
1756 databuf.appendChar(flags);
1757
1758 databuf.appendChar(pool.put(c));
1759 databuf.appendChar(supertype.hasTag(CLASS) ? pool.put(supertype.tsym) : 0);
1760 databuf.appendChar(interfaces.length());
1761 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1762 databuf.appendChar(pool.put(l.head.tsym));
1763 int fieldsCount = 0;
1764 int methodsCount = 0;
1765 for (Scope.Entry e = c.members().elems; e != null; e = e.sibling) {
1766 switch (e.sym.kind) {
1767 case VAR: fieldsCount++; break;
1768 case MTH: if ((e.sym.flags() & HYPOTHETICAL) == 0) methodsCount++;
1769 break;
1770 case TYP: enterInner((ClassSymbol)e.sym); break;
1771 default : Assert.error();
1772 }
1773 }
1774
1775 if (c.trans_local != null) {
1776 for (ClassSymbol local : c.trans_local) {
1777 enterInner(local);
1778 }
1779 }
1780
1781 databuf.appendChar(fieldsCount);
1782 writeFields(c.members().elems);
1783 databuf.appendChar(methodsCount);
1784 writeMethods(c.members().elems);
1785
1786 int acountIdx = beginAttrs();
1787 int acount = 0;
1788
1789 boolean sigReq =
1790 typarams.length() != 0 || supertype.allparams().length() != 0;
1791 for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail)
1792 sigReq = l.head.allparams().length() != 0;
1793 if (sigReq) {
1794 Assert.check(source.allowGenerics());
1795 int alenIdx = writeAttr(names.Signature);
1796 if (typarams.length() != 0) assembleParamsSig(typarams);
1797 assembleSig(supertype);
1798 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1799 assembleSig(l.head);
1800 databuf.appendChar(pool.put(sigbuf.toName(names)));
1801 sigbuf.reset();
1802 endAttr(alenIdx);
1803 acount++;
1804 }
1805
1806 if (c.sourcefile != null && emitSourceFile) {
1807 int alenIdx = writeAttr(names.SourceFile);
1808 // WHM 6/29/1999: Strip file path prefix. We do it here at
1809 // the last possible moment because the sourcefile may be used
1810 // elsewhere in error diagnostics. Fixes 4241573.
1811 //databuf.appendChar(c.pool.put(c.sourcefile));
1812 String simpleName = BaseFileObject.getSimpleName(c.sourcefile);
1813 databuf.appendChar(c.pool.put(names.fromString(simpleName)));
1814 endAttr(alenIdx);
1815 acount++;
1816 }
1817
1818 if (genCrt) {
1819 // Append SourceID attribute
1820 int alenIdx = writeAttr(names.SourceID);
1821 databuf.appendChar(c.pool.put(names.fromString(Long.toString(getLastModified(c.sourcefile)))));
1822 endAttr(alenIdx);
1823 acount++;
1824 // Append CompilationID attribute
1825 alenIdx = writeAttr(names.CompilationID);
1826 databuf.appendChar(c.pool.put(names.fromString(Long.toString(System.currentTimeMillis()))));
1827 endAttr(alenIdx);
1828 acount++;
1829 }
1830
1831 acount += writeFlagAttrs(c.flags());
1832 acount += writeJavaAnnotations(c.getRawAttributes());
1833 acount += writeTypeAnnotations(c.getRawTypeAttributes());
1834 acount += writeEnclosingMethodAttribute(c);
1835 acount += writeExtraClassAttributes(c);
1836
1837 poolbuf.appendInt(JAVA_MAGIC);
1838 poolbuf.appendChar(target.minorVersion);
1839 poolbuf.appendChar(target.majorVersion);
1840
1841 writePool(c.pool);
1842
1843 if (innerClasses != null) {
1844 writeInnerClasses();
1845 acount++;
1846 }
1847
1848 if (!bootstrapMethods.isEmpty()) {
1849 writeBootstrapMethods();
1850 acount++;
1851 }
1852
1853 endAttrs(acountIdx, acount);
1854
1855 poolbuf.appendBytes(databuf.elems, 0, databuf.length);
1856 out.write(poolbuf.elems, 0, poolbuf.length);
1857
1858 pool = c.pool = null; // to conserve space
1859 }
1860
1861 /**Allows subclasses to write additional class attributes
1862 *
1863 * @return the number of attributes written
1864 */
1865 protected int writeExtraClassAttributes(ClassSymbol c) {
1866 return 0;
1867 }
1868
1869 int adjustFlags(final long flags) {
1870 int result = (int)flags;
1871 if ((flags & SYNTHETIC) != 0 && !target.useSyntheticFlag())
1872 result &= ~SYNTHETIC;
1873 if ((flags & ENUM) != 0 && !target.useEnumFlag())
1874 result &= ~ENUM;
1875 if ((flags & ANNOTATION) != 0 && !target.useAnnotationFlag())
1876 result &= ~ANNOTATION;
1877
1878 if ((flags & BRIDGE) != 0 && target.useBridgeFlag())
1879 result |= ACC_BRIDGE;
1880 if ((flags & VARARGS) != 0 && target.useVarargsFlag())
1881 result |= ACC_VARARGS;
1882 if ((flags & DEFAULT) != 0)
1883 result &= ~ABSTRACT;
1884 return result;
1885 }
1886
1887 long getLastModified(FileObject filename) {
1888 long mod = 0;
1889 try {
1890 mod = filename.getLastModified();
1891 } catch (SecurityException e) {
1892 throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage());
1893 }
1894 return mod;
1895 }
1896 }