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 if (m.params != null && 0 != m.params.length()) {
734 int attrIndex = writeAttr(names.MethodParameters);
735 databuf.appendByte(m.params.length());
736 for (VarSymbol s : m.params) {
737 // TODO: expand to cover synthesized, once we figure out
738 // how to represent that.
739 final int flags = (int) s.flags() & (FINAL | SYNTHETIC);
740 // output parameter info
741 databuf.appendChar(pool.put(s.name));
742 databuf.appendInt(flags);
743 }
744 endAttr(attrIndex);
745 return 1;
746 } else
747 return 0;
748 }
749
750
751 /** Write method parameter annotations;
752 * return number of attributes written.
753 */
754 int writeParameterAttrs(MethodSymbol m) {
755 boolean hasVisible = false;
756 boolean hasInvisible = false;
757 if (m.params != null) for (VarSymbol s : m.params) {
758 for (Attribute.Compound a : s.getRawAttributes()) {
759 switch (types.getRetention(a)) {
760 case SOURCE: break;
761 case CLASS: hasInvisible = true; break;
762 case RUNTIME: hasVisible = true; break;
763 default: ;// /* fail soft */ throw new AssertionError(vis);
764 }
765 }
766 }
767
768 int attrCount = 0;
769 if (hasVisible) {
770 int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations);
771 databuf.appendByte(m.params.length());
772 for (VarSymbol s : m.params) {
773 ListBuffer<Attribute.Compound> buf = new ListBuffer<Attribute.Compound>();
774 for (Attribute.Compound a : s.getRawAttributes())
775 if (types.getRetention(a) == RetentionPolicy.RUNTIME)
776 buf.append(a);
777 databuf.appendChar(buf.length());
778 for (Attribute.Compound a : buf)
779 writeCompoundAttribute(a);
780 }
781 endAttr(attrIndex);
782 attrCount++;
783 }
784 if (hasInvisible) {
785 int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations);
786 databuf.appendByte(m.params.length());
787 for (VarSymbol s : m.params) {
788 ListBuffer<Attribute.Compound> buf = new ListBuffer<Attribute.Compound>();
789 for (Attribute.Compound a : s.getRawAttributes())
790 if (types.getRetention(a) == RetentionPolicy.CLASS)
791 buf.append(a);
792 databuf.appendChar(buf.length());
793 for (Attribute.Compound a : buf)
794 writeCompoundAttribute(a);
795 }
796 endAttr(attrIndex);
797 attrCount++;
798 }
799 return attrCount;
800 }
801
802 /**********************************************************************
803 * Writing Java-language annotations (aka metadata, attributes)
804 **********************************************************************/
805
806 /** Write Java-language annotations; return number of JVM
807 * attributes written (zero or one).
808 */
809 int writeJavaAnnotations(List<Attribute.Compound> attrs) {
810 if (attrs.isEmpty()) return 0;
811 ListBuffer<Attribute.Compound> visibles = new ListBuffer<Attribute.Compound>();
812 ListBuffer<Attribute.Compound> invisibles = new ListBuffer<Attribute.Compound>();
813 for (Attribute.Compound a : attrs) {
814 switch (types.getRetention(a)) {
815 case SOURCE: break;
816 case CLASS: invisibles.append(a); break;
817 case RUNTIME: visibles.append(a); break;
818 default: ;// /* fail soft */ throw new AssertionError(vis);
819 }
820 }
821
822 int attrCount = 0;
823 if (visibles.length() != 0) {
824 int attrIndex = writeAttr(names.RuntimeVisibleAnnotations);
825 databuf.appendChar(visibles.length());
826 for (Attribute.Compound a : visibles)
827 writeCompoundAttribute(a);
828 endAttr(attrIndex);
829 attrCount++;
830 }
831 if (invisibles.length() != 0) {
832 int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations);
833 databuf.appendChar(invisibles.length());
834 for (Attribute.Compound a : invisibles)
835 writeCompoundAttribute(a);
836 endAttr(attrIndex);
837 attrCount++;
838 }
839 return attrCount;
840 }
841
842 int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos) {
843 if (typeAnnos.isEmpty()) return 0;
844
845 ListBuffer<Attribute.TypeCompound> visibles = ListBuffer.lb();
846 ListBuffer<Attribute.TypeCompound> invisibles = ListBuffer.lb();
847
848 for (Attribute.TypeCompound tc : typeAnnos) {
849 if (tc.position == null || tc.position.type == TargetType.UNKNOWN) {
850 boolean found = false;
851 // TODO: the position for the container annotation of a
852 // repeating type annotation has to be set.
853 // This cannot be done when the container is created, because
854 // then the position is not determined yet.
855 // How can we link these pieces better together?
856 if (tc.values.size() == 1) {
857 Pair<MethodSymbol, Attribute> val = tc.values.get(0);
858 if (val.fst.getSimpleName().contentEquals("value") &&
859 val.snd instanceof Attribute.Array) {
860 Attribute.Array arr = (Attribute.Array) val.snd;
861 if (arr.values.length != 0 &&
862 arr.values[0] instanceof Attribute.TypeCompound) {
863 TypeCompound atycomp = (Attribute.TypeCompound) arr.values[0];
864 if (atycomp.position.type != TargetType.UNKNOWN) {
865 tc.position = atycomp.position;
866 found = true;
867 }
868 }
869 }
870 }
871 if (!found) {
872 // This happens for nested types like @A Outer. @B Inner.
873 // For method parameters we get the annotation twice! Once with
874 // a valid position, once unknown.
875 // TODO: find a cleaner solution.
876 // System.err.println("ClassWriter: Position UNKNOWN in type annotation: " + tc);
877 continue;
878 }
879 }
880 if (!tc.position.emitToClassfile())
881 continue;
882 switch (types.getRetention(tc)) {
883 case SOURCE: break;
884 case CLASS: invisibles.append(tc); break;
885 case RUNTIME: visibles.append(tc); break;
886 default: ;// /* fail soft */ throw new AssertionError(vis);
887 }
888 }
889
890 int attrCount = 0;
891 if (visibles.length() != 0) {
892 int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations);
893 databuf.appendChar(visibles.length());
894 for (Attribute.TypeCompound p : visibles)
895 writeTypeAnnotation(p);
896 endAttr(attrIndex);
897 attrCount++;
898 }
899
900 if (invisibles.length() != 0) {
901 int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations);
902 databuf.appendChar(invisibles.length());
903 for (Attribute.TypeCompound p : invisibles)
904 writeTypeAnnotation(p);
905 endAttr(attrIndex);
906 attrCount++;
907 }
908
909 return attrCount;
910 }
911
912 /** A visitor to write an attribute including its leading
913 * single-character marker.
914 */
915 class AttributeWriter implements Attribute.Visitor {
916 public void visitConstant(Attribute.Constant _value) {
917 Object value = _value.value;
918 switch (_value.type.getTag()) {
919 case BYTE:
920 databuf.appendByte('B');
921 break;
922 case CHAR:
923 databuf.appendByte('C');
924 break;
925 case SHORT:
926 databuf.appendByte('S');
927 break;
928 case INT:
929 databuf.appendByte('I');
930 break;
931 case LONG:
932 databuf.appendByte('J');
933 break;
934 case FLOAT:
935 databuf.appendByte('F');
936 break;
937 case DOUBLE:
938 databuf.appendByte('D');
939 break;
940 case BOOLEAN:
941 databuf.appendByte('Z');
942 break;
943 case CLASS:
944 Assert.check(value instanceof String);
945 databuf.appendByte('s');
946 value = names.fromString(value.toString()); // CONSTANT_Utf8
947 break;
948 default:
949 throw new AssertionError(_value.type);
950 }
951 databuf.appendChar(pool.put(value));
952 }
953 public void visitEnum(Attribute.Enum e) {
954 databuf.appendByte('e');
955 databuf.appendChar(pool.put(typeSig(e.value.type)));
956 databuf.appendChar(pool.put(e.value.name));
957 }
958 public void visitClass(Attribute.Class clazz) {
959 databuf.appendByte('c');
960 databuf.appendChar(pool.put(typeSig(clazz.classType)));
961 }
962 public void visitCompound(Attribute.Compound compound) {
963 databuf.appendByte('@');
964 writeCompoundAttribute(compound);
965 }
966 public void visitError(Attribute.Error x) {
967 throw new AssertionError(x);
968 }
969 public void visitArray(Attribute.Array array) {
970 databuf.appendByte('[');
971 databuf.appendChar(array.values.length);
972 for (Attribute a : array.values) {
973 a.accept(this);
974 }
975 }
976 }
977 AttributeWriter awriter = new AttributeWriter();
978
979 /** Write a compound attribute excluding the '@' marker. */
980 void writeCompoundAttribute(Attribute.Compound c) {
981 databuf.appendChar(pool.put(typeSig(c.type)));
982 databuf.appendChar(c.values.length());
983 for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) {
984 databuf.appendChar(pool.put(p.fst.name));
985 p.snd.accept(awriter);
986 }
987 }
988
989 void writeTypeAnnotation(Attribute.TypeCompound c) {
990 writePosition(c.position);
991 writeCompoundAttribute(c);
992 }
993
994 void writePosition(TypeAnnotationPosition p) {
995 databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte
996 switch (p.type) {
997 // type cast
998 case CAST:
999 // instanceof
1000 case INSTANCEOF:
1001 // new expression
1002 case NEW:
1003 databuf.appendChar(p.offset);
1004 break;
1005 // local variable
1006 case LOCAL_VARIABLE:
1007 // resource variable
1008 case RESOURCE_VARIABLE:
1009 databuf.appendChar(p.lvarOffset.length); // for table length
1010 for (int i = 0; i < p.lvarOffset.length; ++i) {
1011 databuf.appendChar(p.lvarOffset[i]);
1012 databuf.appendChar(p.lvarLength[i]);
1013 databuf.appendChar(p.lvarIndex[i]);
1014 }
1015 break;
1016 // exception parameter
1017 case EXCEPTION_PARAMETER:
1018 databuf.appendByte(p.exception_index);
1019 break;
1020 // method receiver
1021 case METHOD_RECEIVER:
1022 // Do nothing
1023 break;
1024 // type parameter
1025 case CLASS_TYPE_PARAMETER:
1026 case METHOD_TYPE_PARAMETER:
1027 databuf.appendByte(p.parameter_index);
1028 break;
1029 // type parameter bound
1030 case CLASS_TYPE_PARAMETER_BOUND:
1031 case METHOD_TYPE_PARAMETER_BOUND:
1032 databuf.appendByte(p.parameter_index);
1033 databuf.appendByte(p.bound_index);
1034 break;
1035 // class extends or implements clause
1036 case CLASS_EXTENDS:
1037 databuf.appendChar(p.type_index);
1038 break;
1039 // throws
1040 case THROWS:
1041 databuf.appendChar(p.type_index);
1042 break;
1043 // method parameter
1044 case METHOD_FORMAL_PARAMETER:
1045 databuf.appendByte(p.parameter_index);
1046 break;
1047 // method/constructor/reference type argument
1048 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT:
1049 case METHOD_INVOCATION_TYPE_ARGUMENT:
1050 case METHOD_REFERENCE_TYPE_ARGUMENT:
1051 databuf.appendChar(p.offset);
1052 databuf.appendByte(p.type_index);
1053 break;
1054 // We don't need to worry about these
1055 case METHOD_RETURN:
1056 case FIELD:
1057 break;
1058 // lambda formal parameter
1059 case LAMBDA_FORMAL_PARAMETER:
1060 databuf.appendByte(p.parameter_index);
1061 break;
1062 case UNKNOWN:
1063 throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!");
1064 default:
1065 throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p);
1066 }
1067
1068 { // Append location data for generics/arrays.
1069 databuf.appendByte(p.location.size());
1070 java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location);
1071 for (int i : loc)
1072 databuf.appendByte((byte)i);
1073 }
1074 }
1075
1076 /**********************************************************************
1077 * Writing Objects
1078 **********************************************************************/
1079
1080 /** Enter an inner class into the `innerClasses' set/queue.
1081 */
1082 void enterInner(ClassSymbol c) {
1083 if (c.type.isCompound()) {
1084 throw new AssertionError("Unexpected intersection type: " + c.type);
1085 }
1086 try {
1087 c.complete();
1088 } catch (CompletionFailure ex) {
1089 System.err.println("error: " + c + ": " + ex.getMessage());
1090 throw ex;
1091 }
1092 if (!c.type.hasTag(CLASS)) return; // arrays
1093 if (pool != null && // pool might be null if called from xClassName
1094 c.owner.enclClass() != null &&
1095 (innerClasses == null || !innerClasses.contains(c))) {
1096 // log.errWriter.println("enter inner " + c);//DEBUG
1097 enterInner(c.owner.enclClass());
1098 pool.put(c);
1099 pool.put(c.name);
1100 if (innerClasses == null) {
1101 innerClasses = new HashSet<ClassSymbol>();
1102 innerClassesQueue = new ListBuffer<ClassSymbol>();
1103 pool.put(names.InnerClasses);
1104 }
1105 innerClasses.add(c);
1106 innerClassesQueue.append(c);
1107 }
1108 }
1109
1110 /** Write "inner classes" attribute.
1111 */
1112 void writeInnerClasses() {
1113 int alenIdx = writeAttr(names.InnerClasses);
1114 databuf.appendChar(innerClassesQueue.length());
1115 for (List<ClassSymbol> l = innerClassesQueue.toList();
1116 l.nonEmpty();
1117 l = l.tail) {
1118 ClassSymbol inner = l.head;
1119 char flags = (char) adjustFlags(inner.flags_field);
1120 if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT
1121 if (inner.name.isEmpty()) flags &= ~FINAL; // Anonymous class: unset FINAL flag
1122 if (dumpInnerClassModifiers) {
1123 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1124 pw.println("INNERCLASS " + inner.name);
1125 pw.println("---" + flagNames(flags));
1126 }
1127 databuf.appendChar(pool.get(inner));
1128 databuf.appendChar(
1129 inner.owner.kind == TYP ? pool.get(inner.owner) : 0);
1130 databuf.appendChar(
1131 !inner.name.isEmpty() ? pool.get(inner.name) : 0);
1132 databuf.appendChar(flags);
1133 }
1134 endAttr(alenIdx);
1135 }
1136
1137 /** Write "bootstrapMethods" attribute.
1138 */
1139 void writeBootstrapMethods() {
1140 int alenIdx = writeAttr(names.BootstrapMethods);
1141 databuf.appendChar(bootstrapMethods.size());
1142 for (Map.Entry<DynamicMethod, MethodHandle> entry : bootstrapMethods.entrySet()) {
1143 DynamicMethod dmeth = entry.getKey();
1144 DynamicMethodSymbol dsym = (DynamicMethodSymbol)dmeth.baseSymbol();
1145 //write BSM handle
1146 databuf.appendChar(pool.get(entry.getValue()));
1147 //write static args length
1148 databuf.appendChar(dsym.staticArgs.length);
1149 //write static args array
1150 Object[] uniqueArgs = dmeth.uniqueStaticArgs;
1151 for (Object o : uniqueArgs) {
1152 databuf.appendChar(pool.get(o));
1153 }
1154 }
1155 endAttr(alenIdx);
1156 }
1157
1158 /** Write field symbol, entering all references into constant pool.
1159 */
1160 void writeField(VarSymbol v) {
1161 int flags = adjustFlags(v.flags());
1162 databuf.appendChar(flags);
1163 if (dumpFieldModifiers) {
1164 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1165 pw.println("FIELD " + fieldName(v));
1166 pw.println("---" + flagNames(v.flags()));
1167 }
1168 databuf.appendChar(pool.put(fieldName(v)));
1169 databuf.appendChar(pool.put(typeSig(v.erasure(types))));
1170 int acountIdx = beginAttrs();
1171 int acount = 0;
1172 if (v.getConstValue() != null) {
1173 int alenIdx = writeAttr(names.ConstantValue);
1174 databuf.appendChar(pool.put(v.getConstValue()));
1175 endAttr(alenIdx);
1176 acount++;
1177 }
1178 acount += writeMemberAttrs(v);
1179 endAttrs(acountIdx, acount);
1180 }
1181
1182 /** Write method symbol, entering all references into constant pool.
1183 */
1184 void writeMethod(MethodSymbol m) {
1185 int flags = adjustFlags(m.flags());
1186 databuf.appendChar(flags);
1187 if (dumpMethodModifiers) {
1188 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1189 pw.println("METHOD " + fieldName(m));
1190 pw.println("---" + flagNames(m.flags()));
1191 }
1192 databuf.appendChar(pool.put(fieldName(m)));
1193 databuf.appendChar(pool.put(typeSig(m.externalType(types))));
1194 int acountIdx = beginAttrs();
1195 int acount = 0;
1196 if (m.code != null) {
1197 int alenIdx = writeAttr(names.Code);
1198 writeCode(m.code);
1199 m.code = null; // to conserve space
1200 endAttr(alenIdx);
1201 acount++;
1202 }
1203 List<Type> thrown = m.erasure(types).getThrownTypes();
1204 if (thrown.nonEmpty()) {
1205 int alenIdx = writeAttr(names.Exceptions);
1206 databuf.appendChar(thrown.length());
1207 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1208 databuf.appendChar(pool.put(l.head.tsym));
1209 endAttr(alenIdx);
1210 acount++;
1211 }
1212 if (m.defaultValue != null) {
1213 int alenIdx = writeAttr(names.AnnotationDefault);
1214 m.defaultValue.accept(awriter);
1215 endAttr(alenIdx);
1216 acount++;
1217 }
1218 if (options.isSet(PARAMETERS))
1219 acount += writeMethodParametersAttr(m);
1220 acount += writeMemberAttrs(m);
1221 acount += writeParameterAttrs(m);
1222 endAttrs(acountIdx, acount);
1223 }
1224
1225 /** Write code attribute of method.
1226 */
1227 void writeCode(Code code) {
1228 databuf.appendChar(code.max_stack);
1229 databuf.appendChar(code.max_locals);
1230 databuf.appendInt(code.cp);
1231 databuf.appendBytes(code.code, 0, code.cp);
1232 databuf.appendChar(code.catchInfo.length());
1233 for (List<char[]> l = code.catchInfo.toList();
1234 l.nonEmpty();
1235 l = l.tail) {
1236 for (int i = 0; i < l.head.length; i++)
1237 databuf.appendChar(l.head[i]);
1238 }
1239 int acountIdx = beginAttrs();
1240 int acount = 0;
1241
1242 if (code.lineInfo.nonEmpty()) {
1243 int alenIdx = writeAttr(names.LineNumberTable);
1244 databuf.appendChar(code.lineInfo.length());
1245 for (List<char[]> l = code.lineInfo.reverse();
1246 l.nonEmpty();
1247 l = l.tail)
1248 for (int i = 0; i < l.head.length; i++)
1249 databuf.appendChar(l.head[i]);
1250 endAttr(alenIdx);
1251 acount++;
1252 }
1253
1254 if (genCrt && (code.crt != null)) {
1255 CRTable crt = code.crt;
1256 int alenIdx = writeAttr(names.CharacterRangeTable);
1257 int crtIdx = beginAttrs();
1258 int crtEntries = crt.writeCRT(databuf, code.lineMap, log);
1259 endAttrs(crtIdx, crtEntries);
1260 endAttr(alenIdx);
1261 acount++;
1262 }
1263
1264 // counter for number of generic local variables
1265 int nGenericVars = 0;
1266
1267 if (code.varBufferSize > 0) {
1268 int alenIdx = writeAttr(names.LocalVariableTable);
1269 databuf.appendChar(code.varBufferSize);
1270
1271 for (int i=0; i<code.varBufferSize; i++) {
1272 Code.LocalVar var = code.varBuffer[i];
1273
1274 // write variable info
1275 Assert.check(var.start_pc >= 0
1276 && var.start_pc <= code.cp);
1277 databuf.appendChar(var.start_pc);
1278 Assert.check(var.length >= 0
1279 && (var.start_pc + var.length) <= code.cp);
1280 databuf.appendChar(var.length);
1281 VarSymbol sym = var.sym;
1282 databuf.appendChar(pool.put(sym.name));
1283 Type vartype = sym.erasure(types);
1284 if (needsLocalVariableTypeEntry(sym.type))
1285 nGenericVars++;
1286 databuf.appendChar(pool.put(typeSig(vartype)));
1287 databuf.appendChar(var.reg);
1288 }
1289 endAttr(alenIdx);
1290 acount++;
1291 }
1292
1293 if (nGenericVars > 0) {
1294 int alenIdx = writeAttr(names.LocalVariableTypeTable);
1295 databuf.appendChar(nGenericVars);
1296 int count = 0;
1297
1298 for (int i=0; i<code.varBufferSize; i++) {
1299 Code.LocalVar var = code.varBuffer[i];
1300 VarSymbol sym = var.sym;
1301 if (!needsLocalVariableTypeEntry(sym.type))
1302 continue;
1303 count++;
1304 // write variable info
1305 databuf.appendChar(var.start_pc);
1306 databuf.appendChar(var.length);
1307 databuf.appendChar(pool.put(sym.name));
1308 databuf.appendChar(pool.put(typeSig(sym.type)));
1309 databuf.appendChar(var.reg);
1310 }
1311 Assert.check(count == nGenericVars);
1312 endAttr(alenIdx);
1313 acount++;
1314 }
1315
1316 if (code.stackMapBufferSize > 0) {
1317 if (debugstackmap) System.out.println("Stack map for " + code.meth);
1318 int alenIdx = writeAttr(code.stackMap.getAttributeName(names));
1319 writeStackMap(code);
1320 endAttr(alenIdx);
1321 acount++;
1322 }
1323 endAttrs(acountIdx, acount);
1324 }
1325 //where
1326 private boolean needsLocalVariableTypeEntry(Type t) {
1327 //a local variable needs a type-entry if its type T is generic
1328 //(i.e. |T| != T) and if it's not an intersection type (not supported
1329 //in signature attribute grammar)
1330 return (!types.isSameType(t, types.erasure(t)) &&
1331 !t.isCompound());
1332 }
1333
1334 void writeStackMap(Code code) {
1335 int nframes = code.stackMapBufferSize;
1336 if (debugstackmap) System.out.println(" nframes = " + nframes);
1337 databuf.appendChar(nframes);
1338
1339 switch (code.stackMap) {
1340 case CLDC:
1341 for (int i=0; i<nframes; i++) {
1342 if (debugstackmap) System.out.print(" " + i + ":");
1343 Code.StackMapFrame frame = code.stackMapBuffer[i];
1344
1345 // output PC
1346 if (debugstackmap) System.out.print(" pc=" + frame.pc);
1347 databuf.appendChar(frame.pc);
1348
1349 // output locals
1350 int localCount = 0;
1351 for (int j=0; j<frame.locals.length;
1352 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.locals[j]))) {
1353 localCount++;
1354 }
1355 if (debugstackmap) System.out.print(" nlocals=" +
1356 localCount);
1357 databuf.appendChar(localCount);
1358 for (int j=0; j<frame.locals.length;
1359 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.locals[j]))) {
1360 if (debugstackmap) System.out.print(" local[" + j + "]=");
1361 writeStackMapType(frame.locals[j]);
1362 }
1363
1364 // output stack
1365 int stackCount = 0;
1366 for (int j=0; j<frame.stack.length;
1367 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.stack[j]))) {
1368 stackCount++;
1369 }
1370 if (debugstackmap) System.out.print(" nstack=" +
1371 stackCount);
1372 databuf.appendChar(stackCount);
1373 for (int j=0; j<frame.stack.length;
1374 j += (target.generateEmptyAfterBig() ? 1 : Code.width(frame.stack[j]))) {
1375 if (debugstackmap) System.out.print(" stack[" + j + "]=");
1376 writeStackMapType(frame.stack[j]);
1377 }
1378 if (debugstackmap) System.out.println();
1379 }
1380 break;
1381 case JSR202: {
1382 Assert.checkNull(code.stackMapBuffer);
1383 for (int i=0; i<nframes; i++) {
1384 if (debugstackmap) System.out.print(" " + i + ":");
1385 StackMapTableFrame frame = code.stackMapTableBuffer[i];
1386 frame.write(this);
1387 if (debugstackmap) System.out.println();
1388 }
1389 break;
1390 }
1391 default:
1392 throw new AssertionError("Unexpected stackmap format value");
1393 }
1394 }
1395
1396 //where
1397 void writeStackMapType(Type t) {
1398 if (t == null) {
1399 if (debugstackmap) System.out.print("empty");
1400 databuf.appendByte(0);
1401 }
1402 else switch(t.getTag()) {
1403 case BYTE:
1404 case CHAR:
1405 case SHORT:
1406 case INT:
1407 case BOOLEAN:
1408 if (debugstackmap) System.out.print("int");
1409 databuf.appendByte(1);
1410 break;
1411 case FLOAT:
1412 if (debugstackmap) System.out.print("float");
1413 databuf.appendByte(2);
1414 break;
1415 case DOUBLE:
1416 if (debugstackmap) System.out.print("double");
1417 databuf.appendByte(3);
1418 break;
1419 case LONG:
1420 if (debugstackmap) System.out.print("long");
1421 databuf.appendByte(4);
1422 break;
1423 case BOT: // null
1424 if (debugstackmap) System.out.print("null");
1425 databuf.appendByte(5);
1426 break;
1427 case CLASS:
1428 case ARRAY:
1429 if (debugstackmap) System.out.print("object(" + t + ")");
1430 databuf.appendByte(7);
1431 databuf.appendChar(pool.put(t));
1432 break;
1433 case TYPEVAR:
1434 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")");
1435 databuf.appendByte(7);
1436 databuf.appendChar(pool.put(types.erasure(t).tsym));
1437 break;
1438 case UNINITIALIZED_THIS:
1439 if (debugstackmap) System.out.print("uninit_this");
1440 databuf.appendByte(6);
1441 break;
1442 case UNINITIALIZED_OBJECT:
1443 { UninitializedType uninitType = (UninitializedType)t;
1444 databuf.appendByte(8);
1445 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset);
1446 databuf.appendChar(uninitType.offset);
1447 }
1448 break;
1449 default:
1450 throw new AssertionError();
1451 }
1452 }
1453
1454 /** An entry in the JSR202 StackMapTable */
1455 abstract static class StackMapTableFrame {
1456 abstract int getFrameType();
1457
1458 void write(ClassWriter writer) {
1459 int frameType = getFrameType();
1460 writer.databuf.appendByte(frameType);
1461 if (writer.debugstackmap) System.out.print(" frame_type=" + frameType);
1462 }
1463
1464 static class SameFrame extends StackMapTableFrame {
1465 final int offsetDelta;
1466 SameFrame(int offsetDelta) {
1467 this.offsetDelta = offsetDelta;
1468 }
1469 int getFrameType() {
1470 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED;
1471 }
1472 @Override
1473 void write(ClassWriter writer) {
1474 super.write(writer);
1475 if (getFrameType() == SAME_FRAME_EXTENDED) {
1476 writer.databuf.appendChar(offsetDelta);
1477 if (writer.debugstackmap){
1478 System.out.print(" offset_delta=" + offsetDelta);
1479 }
1480 }
1481 }
1482 }
1483
1484 static class SameLocals1StackItemFrame extends StackMapTableFrame {
1485 final int offsetDelta;
1486 final Type stack;
1487 SameLocals1StackItemFrame(int offsetDelta, Type stack) {
1488 this.offsetDelta = offsetDelta;
1489 this.stack = stack;
1490 }
1491 int getFrameType() {
1492 return (offsetDelta < SAME_FRAME_SIZE) ?
1493 (SAME_FRAME_SIZE + offsetDelta) :
1494 SAME_LOCALS_1_STACK_ITEM_EXTENDED;
1495 }
1496 @Override
1497 void write(ClassWriter writer) {
1498 super.write(writer);
1499 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
1500 writer.databuf.appendChar(offsetDelta);
1501 if (writer.debugstackmap) {
1502 System.out.print(" offset_delta=" + offsetDelta);
1503 }
1504 }
1505 if (writer.debugstackmap) {
1506 System.out.print(" stack[" + 0 + "]=");
1507 }
1508 writer.writeStackMapType(stack);
1509 }
1510 }
1511
1512 static class ChopFrame extends StackMapTableFrame {
1513 final int frameType;
1514 final int offsetDelta;
1515 ChopFrame(int frameType, int offsetDelta) {
1516 this.frameType = frameType;
1517 this.offsetDelta = offsetDelta;
1518 }
1519 int getFrameType() { return frameType; }
1520 @Override
1521 void write(ClassWriter writer) {
1522 super.write(writer);
1523 writer.databuf.appendChar(offsetDelta);
1524 if (writer.debugstackmap) {
1525 System.out.print(" offset_delta=" + offsetDelta);
1526 }
1527 }
1528 }
1529
1530 static class AppendFrame extends StackMapTableFrame {
1531 final int frameType;
1532 final int offsetDelta;
1533 final Type[] locals;
1534 AppendFrame(int frameType, int offsetDelta, Type[] locals) {
1535 this.frameType = frameType;
1536 this.offsetDelta = offsetDelta;
1537 this.locals = locals;
1538 }
1539 int getFrameType() { return frameType; }
1540 @Override
1541 void write(ClassWriter writer) {
1542 super.write(writer);
1543 writer.databuf.appendChar(offsetDelta);
1544 if (writer.debugstackmap) {
1545 System.out.print(" offset_delta=" + offsetDelta);
1546 }
1547 for (int i=0; i<locals.length; i++) {
1548 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1549 writer.writeStackMapType(locals[i]);
1550 }
1551 }
1552 }
1553
1554 static class FullFrame extends StackMapTableFrame {
1555 final int offsetDelta;
1556 final Type[] locals;
1557 final Type[] stack;
1558 FullFrame(int offsetDelta, Type[] locals, Type[] stack) {
1559 this.offsetDelta = offsetDelta;
1560 this.locals = locals;
1561 this.stack = stack;
1562 }
1563 int getFrameType() { return FULL_FRAME; }
1564 @Override
1565 void write(ClassWriter writer) {
1566 super.write(writer);
1567 writer.databuf.appendChar(offsetDelta);
1568 writer.databuf.appendChar(locals.length);
1569 if (writer.debugstackmap) {
1570 System.out.print(" offset_delta=" + offsetDelta);
1571 System.out.print(" nlocals=" + locals.length);
1572 }
1573 for (int i=0; i<locals.length; i++) {
1574 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1575 writer.writeStackMapType(locals[i]);
1576 }
1577
1578 writer.databuf.appendChar(stack.length);
1579 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); }
1580 for (int i=0; i<stack.length; i++) {
1581 if (writer.debugstackmap) System.out.print(" stack[" + i + "]=");
1582 writer.writeStackMapType(stack[i]);
1583 }
1584 }
1585 }
1586
1587 /** Compare this frame with the previous frame and produce
1588 * an entry of compressed stack map frame. */
1589 static StackMapTableFrame getInstance(Code.StackMapFrame this_frame,
1590 int prev_pc,
1591 Type[] prev_locals,
1592 Types types) {
1593 Type[] locals = this_frame.locals;
1594 Type[] stack = this_frame.stack;
1595 int offset_delta = this_frame.pc - prev_pc - 1;
1596 if (stack.length == 1) {
1597 if (locals.length == prev_locals.length
1598 && compare(prev_locals, locals, types) == 0) {
1599 return new SameLocals1StackItemFrame(offset_delta, stack[0]);
1600 }
1601 } else if (stack.length == 0) {
1602 int diff_length = compare(prev_locals, locals, types);
1603 if (diff_length == 0) {
1604 return new SameFrame(offset_delta);
1605 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) {
1606 // APPEND
1607 Type[] local_diff = new Type[-diff_length];
1608 for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) {
1609 local_diff[j] = locals[i];
1610 }
1611 return new AppendFrame(SAME_FRAME_EXTENDED - diff_length,
1612 offset_delta,
1613 local_diff);
1614 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) {
1615 // CHOP
1616 return new ChopFrame(SAME_FRAME_EXTENDED - diff_length,
1617 offset_delta);
1618 }
1619 }
1620 // FULL_FRAME
1621 return new FullFrame(offset_delta, locals, stack);
1622 }
1623
1624 static boolean isInt(Type t) {
1625 return (t.getTag().isStrictSubRangeOf(INT) || t.hasTag(BOOLEAN));
1626 }
1627
1628 static boolean isSameType(Type t1, Type t2, Types types) {
1629 if (t1 == null) { return t2 == null; }
1630 if (t2 == null) { return false; }
1631
1632 if (isInt(t1) && isInt(t2)) { return true; }
1633
1634 if (t1.hasTag(UNINITIALIZED_THIS)) {
1635 return t2.hasTag(UNINITIALIZED_THIS);
1636 } else if (t1.hasTag(UNINITIALIZED_OBJECT)) {
1637 if (t2.hasTag(UNINITIALIZED_OBJECT)) {
1638 return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset;
1639 } else {
1640 return false;
1641 }
1642 } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) {
1643 return false;
1644 }
1645
1646 return types.isSameType(t1, t2);
1647 }
1648
1649 static int compare(Type[] arr1, Type[] arr2, Types types) {
1650 int diff_length = arr1.length - arr2.length;
1651 if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) {
1652 return Integer.MAX_VALUE;
1653 }
1654 int len = (diff_length > 0) ? arr2.length : arr1.length;
1655 for (int i=0; i<len; i++) {
1656 if (!isSameType(arr1[i], arr2[i], types)) {
1657 return Integer.MAX_VALUE;
1658 }
1659 }
1660 return diff_length;
1661 }
1662 }
1663
1664 void writeFields(Scope.Entry e) {
1665 // process them in reverse sibling order;
1666 // i.e., process them in declaration order.
1667 List<VarSymbol> vars = List.nil();
1668 for (Scope.Entry i = e; i != null; i = i.sibling) {
1669 if (i.sym.kind == VAR) vars = vars.prepend((VarSymbol)i.sym);
1670 }
1671 while (vars.nonEmpty()) {
1672 writeField(vars.head);
1673 vars = vars.tail;
1674 }
1675 }
1676
1677 void writeMethods(Scope.Entry e) {
1678 List<MethodSymbol> methods = List.nil();
1679 for (Scope.Entry i = e; i != null; i = i.sibling) {
1680 if (i.sym.kind == MTH && (i.sym.flags() & HYPOTHETICAL) == 0)
1681 methods = methods.prepend((MethodSymbol)i.sym);
1682 }
1683 while (methods.nonEmpty()) {
1684 writeMethod(methods.head);
1685 methods = methods.tail;
1686 }
1687 }
1688
1689 /** Emit a class file for a given class.
1690 * @param c The class from which a class file is generated.
1691 */
1692 public JavaFileObject writeClass(ClassSymbol c)
1693 throws IOException, PoolOverflow, StringOverflow
1694 {
1695 JavaFileObject outFile
1696 = fileManager.getJavaFileForOutput(CLASS_OUTPUT,
1697 c.flatname.toString(),
1698 JavaFileObject.Kind.CLASS,
1699 c.sourcefile);
1700 OutputStream out = outFile.openOutputStream();
1701 try {
1702 writeClassFile(out, c);
1703 if (verbose)
1704 log.printVerbose("wrote.file", outFile);
1705 out.close();
1706 out = null;
1707 } finally {
1708 if (out != null) {
1709 // if we are propogating an exception, delete the file
1710 out.close();
1711 outFile.delete();
1712 outFile = null;
1713 }
1714 }
1715 return outFile; // may be null if write failed
1716 }
1717
1718 /** Write class `c' to outstream `out'.
1719 */
1720 public void writeClassFile(OutputStream out, ClassSymbol c)
1721 throws IOException, PoolOverflow, StringOverflow {
1722 Assert.check((c.flags() & COMPOUND) == 0);
1723 databuf.reset();
1724 poolbuf.reset();
1725 sigbuf.reset();
1726 pool = c.pool;
1727 innerClasses = null;
1728 innerClassesQueue = null;
1729 bootstrapMethods = new LinkedHashMap<DynamicMethod, MethodHandle>();
1730
1731 Type supertype = types.supertype(c.type);
1732 List<Type> interfaces = types.interfaces(c.type);
1733 List<Type> typarams = c.type.getTypeArguments();
1734
1735 int flags = adjustFlags(c.flags() & ~DEFAULT);
1736 if ((flags & PROTECTED) != 0) flags |= PUBLIC;
1737 flags = flags & ClassFlags & ~STRICTFP;
1738 if ((flags & INTERFACE) == 0) flags |= ACC_SUPER;
1739 if (c.isInner() && c.name.isEmpty()) flags &= ~FINAL;
1740 if (dumpClassModifiers) {
1741 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1742 pw.println();
1743 pw.println("CLASSFILE " + c.getQualifiedName());
1744 pw.println("---" + flagNames(flags));
1745 }
1746 databuf.appendChar(flags);
1747
1748 databuf.appendChar(pool.put(c));
1749 databuf.appendChar(supertype.hasTag(CLASS) ? pool.put(supertype.tsym) : 0);
1750 databuf.appendChar(interfaces.length());
1751 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1752 databuf.appendChar(pool.put(l.head.tsym));
1753 int fieldsCount = 0;
1754 int methodsCount = 0;
1755 for (Scope.Entry e = c.members().elems; e != null; e = e.sibling) {
1756 switch (e.sym.kind) {
1757 case VAR: fieldsCount++; break;
1758 case MTH: if ((e.sym.flags() & HYPOTHETICAL) == 0) methodsCount++;
1759 break;
1760 case TYP: enterInner((ClassSymbol)e.sym); break;
1761 default : Assert.error();
1762 }
1763 }
1764
1765 if (c.trans_local != null) {
1766 for (ClassSymbol local : c.trans_local) {
1767 enterInner(local);
1768 }
1769 }
1770
1771 databuf.appendChar(fieldsCount);
1772 writeFields(c.members().elems);
1773 databuf.appendChar(methodsCount);
1774 writeMethods(c.members().elems);
1775
1776 int acountIdx = beginAttrs();
1777 int acount = 0;
1778
1779 boolean sigReq =
1780 typarams.length() != 0 || supertype.allparams().length() != 0;
1781 for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail)
1782 sigReq = l.head.allparams().length() != 0;
1783 if (sigReq) {
1784 Assert.check(source.allowGenerics());
1785 int alenIdx = writeAttr(names.Signature);
1786 if (typarams.length() != 0) assembleParamsSig(typarams);
1787 assembleSig(supertype);
1788 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1789 assembleSig(l.head);
1790 databuf.appendChar(pool.put(sigbuf.toName(names)));
1791 sigbuf.reset();
1792 endAttr(alenIdx);
1793 acount++;
1794 }
1795
1796 if (c.sourcefile != null && emitSourceFile) {
1797 int alenIdx = writeAttr(names.SourceFile);
1798 // WHM 6/29/1999: Strip file path prefix. We do it here at
1799 // the last possible moment because the sourcefile may be used
1800 // elsewhere in error diagnostics. Fixes 4241573.
1801 //databuf.appendChar(c.pool.put(c.sourcefile));
1802 String simpleName = BaseFileObject.getSimpleName(c.sourcefile);
1803 databuf.appendChar(c.pool.put(names.fromString(simpleName)));
1804 endAttr(alenIdx);
1805 acount++;
1806 }
1807
1808 if (genCrt) {
1809 // Append SourceID attribute
1810 int alenIdx = writeAttr(names.SourceID);
1811 databuf.appendChar(c.pool.put(names.fromString(Long.toString(getLastModified(c.sourcefile)))));
1812 endAttr(alenIdx);
1813 acount++;
1814 // Append CompilationID attribute
1815 alenIdx = writeAttr(names.CompilationID);
1816 databuf.appendChar(c.pool.put(names.fromString(Long.toString(System.currentTimeMillis()))));
1817 endAttr(alenIdx);
1818 acount++;
1819 }
1820
1821 acount += writeFlagAttrs(c.flags());
1822 acount += writeJavaAnnotations(c.getRawAttributes());
1823 acount += writeTypeAnnotations(c.getRawTypeAttributes());
1824 acount += writeEnclosingMethodAttribute(c);
1825 acount += writeExtraClassAttributes(c);
1826
1827 poolbuf.appendInt(JAVA_MAGIC);
1828 poolbuf.appendChar(target.minorVersion);
1829 poolbuf.appendChar(target.majorVersion);
1830
1831 writePool(c.pool);
1832
1833 if (innerClasses != null) {
1834 writeInnerClasses();
1835 acount++;
1836 }
1837
1838 if (!bootstrapMethods.isEmpty()) {
1839 writeBootstrapMethods();
1840 acount++;
1841 }
1842
1843 endAttrs(acountIdx, acount);
1844
1845 poolbuf.appendBytes(databuf.elems, 0, databuf.length);
1846 out.write(poolbuf.elems, 0, poolbuf.length);
1847
1848 pool = c.pool = null; // to conserve space
1849 }
1850
1851 /**Allows subclasses to write additional class attributes
1852 *
1853 * @return the number of attributes written
1854 */
1855 protected int writeExtraClassAttributes(ClassSymbol c) {
1856 return 0;
1857 }
1858
1859 int adjustFlags(final long flags) {
1860 int result = (int)flags;
1861 if ((flags & SYNTHETIC) != 0 && !target.useSyntheticFlag())
1862 result &= ~SYNTHETIC;
1863 if ((flags & ENUM) != 0 && !target.useEnumFlag())
1864 result &= ~ENUM;
1865 if ((flags & ANNOTATION) != 0 && !target.useAnnotationFlag())
1866 result &= ~ANNOTATION;
1867
1868 if ((flags & BRIDGE) != 0 && target.useBridgeFlag())
1869 result |= ACC_BRIDGE;
1870 if ((flags & VARARGS) != 0 && target.useVarargsFlag())
1871 result |= ACC_VARARGS;
1872 if ((flags & DEFAULT) != 0)
1873 result &= ~ABSTRACT;
1874 return result;
1875 }
1876
1877 long getLastModified(FileObject filename) {
1878 long mod = 0;
1879 try {
1880 mod = filename.getLastModified();
1881 } catch (SecurityException e) {
1882 throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage());
1883 }
1884 return mod;
1885 }
1886 }