1 /*
2 * Copyright (c) 1999, 2018, 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 import java.util.LinkedHashSet;
34
35 import javax.tools.JavaFileManager;
36 import javax.tools.FileObject;
37 import javax.tools.JavaFileManager.Location;
38 import javax.tools.JavaFileObject;
39
40 import com.sun.tools.javac.code.*;
41 import com.sun.tools.javac.code.Attribute.RetentionPolicy;
42 import com.sun.tools.javac.code.Directive.*;
43 import com.sun.tools.javac.code.Symbol.*;
44 import com.sun.tools.javac.code.Type.*;
45 import com.sun.tools.javac.code.Types.UniqueType;
46 import com.sun.tools.javac.file.PathFileObject;
47 import com.sun.tools.javac.jvm.Pool.DynamicMethod;
48 import com.sun.tools.javac.jvm.Pool.Method;
49 import com.sun.tools.javac.jvm.Pool.MethodHandle;
50 import com.sun.tools.javac.jvm.Pool.Variable;
51 import com.sun.tools.javac.main.Option;
52 import com.sun.tools.javac.util.*;
53
54 import static com.sun.tools.javac.code.Flags.*;
55 import static com.sun.tools.javac.code.Kinds.Kind.*;
56 import static com.sun.tools.javac.code.Scope.LookupKind.NON_RECURSIVE;
57 import static com.sun.tools.javac.code.TypeTag.*;
58 import static com.sun.tools.javac.main.Option.*;
59
60 import static javax.tools.StandardLocation.CLASS_OUTPUT;
61
62 /** This class provides operations to map an internal symbol table graph
63 * rooted in a ClassSymbol into a classfile.
64 *
65 * <p><b>This is NOT part of any supported API.
66 * If you write code that depends on this, you do so at your own risk.
67 * This code and its internal interfaces are subject to change or
68 * deletion without notice.</b>
69 */
70 public class ClassWriter extends ClassFile {
71 protected static final Context.Key<ClassWriter> classWriterKey = new Context.Key<>();
72
73 private final Options options;
74
75 /** Switch: verbose output.
76 */
77 private boolean verbose;
78
79 /** Switch: emit source file attribute.
80 */
81 private boolean emitSourceFile;
82
83 /** Switch: generate CharacterRangeTable attribute.
84 */
85 private boolean genCrt;
86
87 /** Switch: describe the generated stackmap.
88 */
89 private boolean debugstackmap;
90
91 /**
92 * Target class version.
93 */
94 private Target target;
95
96 /**
97 * Source language version.
98 */
99 private Source source;
100
101 /** Type utilities. */
102 private Types types;
103
104 /**
105 * If true, class files will be written in module-specific subdirectories
106 * of the CLASS_OUTPUT location.
107 */
108 public boolean multiModuleMode;
109
110 /** The initial sizes of the data and constant pool buffers.
111 * Sizes are increased when buffers get full.
112 */
113 static final int DATA_BUF_SIZE = 0x0fff0;
114 static final int POOL_BUF_SIZE = 0x1fff0;
115
116 /** An output buffer for member info.
117 */
118 ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE);
119
120 /** An output buffer for the constant pool.
121 */
122 ByteBuffer poolbuf = new ByteBuffer(POOL_BUF_SIZE);
123
124 /** The constant pool.
125 */
126 Pool pool;
127
128 /** The inner classes to be written, as a set.
129 */
130 Set<ClassSymbol> innerClasses;
131
132 /** The inner classes to be written, as a queue where
133 * enclosing classes come first.
134 */
135 ListBuffer<ClassSymbol> innerClassesQueue;
136
137 /** The bootstrap methods to be written in the corresponding class attribute
138 * (one for each invokedynamic)
139 */
140 Map<DynamicMethod.BootstrapMethodsKey, DynamicMethod.BootstrapMethodsValue> bootstrapMethods;
141
142 /** The log to use for verbose output.
143 */
144 private final Log log;
145
146 /** The name table. */
147 private final Names names;
148
149 /** Access to files. */
150 private final JavaFileManager fileManager;
151
152 /** Sole signature generator */
153 private final CWSignatureGenerator signatureGen;
154
155 /** The tags and constants used in compressed stackmap. */
156 static final int SAME_FRAME_SIZE = 64;
157 static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247;
158 static final int SAME_FRAME_EXTENDED = 251;
159 static final int FULL_FRAME = 255;
160 static final int MAX_LOCAL_LENGTH_DIFF = 4;
161
162 /** Get the ClassWriter instance for this context. */
163 public static ClassWriter instance(Context context) {
164 ClassWriter instance = context.get(classWriterKey);
165 if (instance == null)
166 instance = new ClassWriter(context);
167 return instance;
168 }
169
170 /** Construct a class writer, given an options table.
171 */
172 protected ClassWriter(Context context) {
173 context.put(classWriterKey, this);
174
175 log = Log.instance(context);
176 names = Names.instance(context);
177 options = Options.instance(context);
178 target = Target.instance(context);
179 source = Source.instance(context);
180 types = Types.instance(context);
181 fileManager = context.get(JavaFileManager.class);
182 signatureGen = new CWSignatureGenerator(types);
183
184 verbose = options.isSet(VERBOSE);
185 genCrt = options.isSet(XJCOV);
186 debugstackmap = options.isSet("debug.stackmap");
187
188 emitSourceFile = options.isUnset(G_CUSTOM) ||
189 options.isSet(G_CUSTOM, "source");
190
191 String modifierFlags = options.get("debug.dumpmodifiers");
192 if (modifierFlags != null) {
193 dumpClassModifiers = modifierFlags.indexOf('c') != -1;
194 dumpFieldModifiers = modifierFlags.indexOf('f') != -1;
195 dumpInnerClassModifiers = modifierFlags.indexOf('i') != -1;
196 dumpMethodModifiers = modifierFlags.indexOf('m') != -1;
197 }
198 }
199
200 /******************************************************************
201 * Diagnostics: dump generated class names and modifiers
202 ******************************************************************/
203
204 /** Value of option 'dumpmodifiers' is a string
205 * indicating which modifiers should be dumped for debugging:
206 * 'c' -- classes
207 * 'f' -- fields
208 * 'i' -- innerclass attributes
209 * 'm' -- methods
210 * For example, to dump everything:
211 * javac -XDdumpmodifiers=cifm MyProg.java
212 */
213 private boolean dumpClassModifiers; // -XDdumpmodifiers=c
214 private boolean dumpFieldModifiers; // -XDdumpmodifiers=f
215 private boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i
216 private boolean dumpMethodModifiers; // -XDdumpmodifiers=m
217
218
219 /** Return flags as a string, separated by " ".
220 */
221 public static String flagNames(long flags) {
222 StringBuilder sbuf = new StringBuilder();
223 int i = 0;
224 long f = flags & StandardFlags;
225 while (f != 0) {
226 if ((f & 1) != 0) {
227 sbuf.append(" ");
228 sbuf.append(flagName[i]);
229 }
230 f = f >> 1;
231 i++;
232 }
233 return sbuf.toString();
234 }
235 //where
236 private final static String[] flagName = {
237 "PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL",
238 "SUPER", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE",
239 "ABSTRACT", "STRICTFP"};
240
241 /******************************************************************
242 * Output routines
243 ******************************************************************/
244
245 /** Write a character into given byte buffer;
246 * byte buffer will not be grown.
247 */
248 void putChar(ByteBuffer buf, int op, int x) {
249 buf.elems[op ] = (byte)((x >> 8) & 0xFF);
250 buf.elems[op+1] = (byte)((x ) & 0xFF);
251 }
252
253 /** Write an integer into given byte buffer;
254 * byte buffer will not be grown.
255 */
256 void putInt(ByteBuffer buf, int adr, int x) {
257 buf.elems[adr ] = (byte)((x >> 24) & 0xFF);
258 buf.elems[adr+1] = (byte)((x >> 16) & 0xFF);
259 buf.elems[adr+2] = (byte)((x >> 8) & 0xFF);
260 buf.elems[adr+3] = (byte)((x ) & 0xFF);
261 }
262
263 /**
264 * Signature Generation
265 */
266 private class CWSignatureGenerator extends Types.SignatureGenerator {
267
268 /**
269 * An output buffer for type signatures.
270 */
271 ByteBuffer sigbuf = new ByteBuffer();
272
273 CWSignatureGenerator(Types types) {
274 super(types);
275 }
276
277 /**
278 * Assemble signature of given type in string buffer.
279 * Check for uninitialized types before calling the general case.
280 */
281 @Override
282 public void assembleSig(Type type) {
283 switch (type.getTag()) {
284 case UNINITIALIZED_THIS:
285 case UNINITIALIZED_OBJECT:
286 // we don't yet have a spec for uninitialized types in the
287 // local variable table
288 assembleSig(types.erasure(((UninitializedType)type).qtype));
289 break;
290 default:
291 super.assembleSig(type);
292 }
293 }
294
295 @Override
296 protected void append(char ch) {
297 sigbuf.appendByte(ch);
298 }
299
300 @Override
301 protected void append(byte[] ba) {
302 sigbuf.appendBytes(ba);
303 }
304
305 @Override
306 protected void append(Name name) {
307 sigbuf.appendName(name);
308 }
309
310 @Override
311 protected void classReference(ClassSymbol c) {
312 enterInner(c);
313 }
314
315 private void reset() {
316 sigbuf.reset();
317 }
318
319 private Name toName() {
320 return sigbuf.toName(names);
321 }
322
323 private boolean isEmpty() {
324 return sigbuf.length == 0;
325 }
326 }
327
328 /**
329 * Return signature of given type
330 */
331 Name typeSig(Type type) {
332 Assert.check(signatureGen.isEmpty());
333 //- System.out.println(" ? " + type);
334 signatureGen.assembleSig(type);
335 Name n = signatureGen.toName();
336 signatureGen.reset();
337 //- System.out.println(" " + n);
338 return n;
339 }
340
341 /** Given a type t, return the extended class name of its erasure in
342 * external representation.
343 */
344 public Name xClassName(Type t) {
345 if (t.hasTag(CLASS)) {
346 return names.fromUtf(externalize(t.tsym.flatName()));
347 } else if (t.hasTag(ARRAY)) {
348 return typeSig(types.erasure(t));
349 } else {
350 throw new AssertionError("xClassName expects class or array type, got " + t);
351 }
352 }
353
354 /******************************************************************
355 * Writing the Constant Pool
356 ******************************************************************/
357
358 /** Thrown when the constant pool is over full.
359 */
360 public static class PoolOverflow extends Exception {
361 private static final long serialVersionUID = 0;
362 public PoolOverflow() {}
363 }
364 public static class StringOverflow extends Exception {
365 private static final long serialVersionUID = 0;
366 public final String value;
367 public StringOverflow(String s) {
368 value = s;
369 }
370 }
371
372 /** Write constant pool to pool buffer.
373 * Note: during writing, constant pool
374 * might grow since some parts of constants still need to be entered.
375 */
376 void writePool(Pool pool) throws PoolOverflow, StringOverflow {
377 int poolCountIdx = poolbuf.length;
378 poolbuf.appendChar(0);
379 int i = 1;
380 while (i < pool.pp) {
381 Object value = pool.pool[i];
382 Assert.checkNonNull(value);
383 if (value instanceof Method || value instanceof Variable)
384 value = ((DelegatedSymbol)value).getUnderlyingSymbol();
385
386 if (value instanceof MethodSymbol) {
387 MethodSymbol m = (MethodSymbol)value;
388 if (!m.isDynamic()) {
389 poolbuf.appendByte((m.owner.flags() & INTERFACE) != 0
390 ? CONSTANT_InterfaceMethodref
391 : CONSTANT_Methodref);
392 poolbuf.appendChar(pool.put(m.owner));
393 poolbuf.appendChar(pool.put(nameType(m)));
394 } else {
395 //invokedynamic
396 DynamicMethodSymbol dynSym = (DynamicMethodSymbol)m;
397 MethodHandle handle = new MethodHandle(dynSym.bsmKind, dynSym.bsm, types);
398 DynamicMethod.BootstrapMethodsKey key = new DynamicMethod.BootstrapMethodsKey(dynSym, types);
399
400 // Figure out the index for existing BSM; create a new BSM if no key
401 DynamicMethod.BootstrapMethodsValue val = bootstrapMethods.get(key);
402 if (val == null) {
403 int index = bootstrapMethods.size();
404 val = new DynamicMethod.BootstrapMethodsValue(handle, index);
405 bootstrapMethods.put(key, val);
406 }
407
408 //init cp entries
409 pool.put(names.BootstrapMethods);
410 pool.put(handle);
411 for (Object staticArg : dynSym.staticArgs) {
412 pool.put(staticArg);
413 }
414 poolbuf.appendByte(CONSTANT_InvokeDynamic);
415 poolbuf.appendChar(val.index);
416 poolbuf.appendChar(pool.put(nameType(dynSym)));
417 }
418 } else if (value instanceof VarSymbol) {
419 VarSymbol v = (VarSymbol)value;
420 poolbuf.appendByte(CONSTANT_Fieldref);
421 poolbuf.appendChar(pool.put(v.owner));
422 poolbuf.appendChar(pool.put(nameType(v)));
423 } else if (value instanceof Name) {
424 poolbuf.appendByte(CONSTANT_Utf8);
425 byte[] bs = ((Name)value).toUtf();
426 poolbuf.appendChar(bs.length);
427 poolbuf.appendBytes(bs, 0, bs.length);
428 if (bs.length > Pool.MAX_STRING_LENGTH)
429 throw new StringOverflow(value.toString());
430 } else if (value instanceof ClassSymbol) {
431 ClassSymbol c = (ClassSymbol)value;
432 if (c.owner.kind == TYP) pool.put(c.owner);
433 poolbuf.appendByte(CONSTANT_Class);
434 if (c.type.hasTag(ARRAY)) {
435 poolbuf.appendChar(pool.put(typeSig(c.type)));
436 } else {
437 poolbuf.appendChar(pool.put(names.fromUtf(externalize(c.flatname))));
438 enterInner(c);
439 }
440 } else if (value instanceof NameAndType) {
441 NameAndType nt = (NameAndType)value;
442 poolbuf.appendByte(CONSTANT_NameandType);
443 poolbuf.appendChar(pool.put(nt.name));
444 poolbuf.appendChar(pool.put(typeSig(nt.uniqueType.type)));
445 } else if (value instanceof Integer) {
446 poolbuf.appendByte(CONSTANT_Integer);
447 poolbuf.appendInt(((Integer)value).intValue());
448 } else if (value instanceof Long) {
449 poolbuf.appendByte(CONSTANT_Long);
450 poolbuf.appendLong(((Long)value).longValue());
451 i++;
452 } else if (value instanceof Float) {
453 poolbuf.appendByte(CONSTANT_Float);
454 poolbuf.appendFloat(((Float)value).floatValue());
455 } else if (value instanceof Double) {
456 poolbuf.appendByte(CONSTANT_Double);
457 poolbuf.appendDouble(((Double)value).doubleValue());
458 i++;
459 } else if (value instanceof String) {
460 poolbuf.appendByte(CONSTANT_String);
461 poolbuf.appendChar(pool.put(names.fromString((String)value)));
462 } else if (value instanceof UniqueType) {
463 Type type = ((UniqueType)value).type;
464 if (type.hasTag(METHOD)) {
465 poolbuf.appendByte(CONSTANT_MethodType);
466 poolbuf.appendChar(pool.put(typeSig((MethodType)type)));
467 } else {
468 Assert.check(type.hasTag(ARRAY));
469 poolbuf.appendByte(CONSTANT_Class);
470 poolbuf.appendChar(pool.put(xClassName(type)));
471 }
472 } else if (value instanceof MethodHandle) {
473 MethodHandle ref = (MethodHandle)value;
474 poolbuf.appendByte(CONSTANT_MethodHandle);
475 poolbuf.appendByte(ref.refKind);
476 poolbuf.appendChar(pool.put(ref.refSym));
477 } else if (value instanceof ModuleSymbol) {
478 ModuleSymbol m = (ModuleSymbol)value;
479 poolbuf.appendByte(CONSTANT_Module);
480 poolbuf.appendChar(pool.put(m.name));
481 } else if (value instanceof PackageSymbol) {
482 PackageSymbol m = (PackageSymbol)value;
483 poolbuf.appendByte(CONSTANT_Package);
484 poolbuf.appendChar(pool.put(names.fromUtf(externalize(m.fullname))));
485 } else {
486 Assert.error("writePool " + value);
487 }
488 i++;
489 }
490 if (pool.pp > Pool.MAX_ENTRIES)
491 throw new PoolOverflow();
492 putChar(poolbuf, poolCountIdx, pool.pp);
493 }
494
495 /** Given a symbol, return its name-and-type.
496 */
497 NameAndType nameType(Symbol sym) {
498 return new NameAndType(sym.name, sym.externalType(types), types);
499 // the NameAndType is generated from a symbol reference, and the
500 // adjustment of adding an additional this$n parameter needs to be made.
501 }
502
503 /******************************************************************
504 * Writing Attributes
505 ******************************************************************/
506
507 /** Write header for an attribute to data buffer and return
508 * position past attribute length index.
509 */
510 int writeAttr(Name attrName) {
511 databuf.appendChar(pool.put(attrName));
512 databuf.appendInt(0);
513 return databuf.length;
514 }
515
516 /** Fill in attribute length.
517 */
518 void endAttr(int index) {
519 putInt(databuf, index - 4, databuf.length - index);
520 }
521
522 /** Leave space for attribute count and return index for
523 * number of attributes field.
524 */
525 int beginAttrs() {
526 databuf.appendChar(0);
527 return databuf.length;
528 }
529
530 /** Fill in number of attributes.
531 */
532 void endAttrs(int index, int count) {
533 putChar(databuf, index - 2, count);
534 }
535
536 /** Write the EnclosingMethod attribute if needed.
537 * Returns the number of attributes written (0 or 1).
538 */
539 int writeEnclosingMethodAttribute(ClassSymbol c) {
540 return writeEnclosingMethodAttribute(names.EnclosingMethod, c);
541 }
542
543 /** Write the EnclosingMethod attribute with a specified name.
544 * Returns the number of attributes written (0 or 1).
545 */
546 protected int writeEnclosingMethodAttribute(Name attributeName, ClassSymbol c) {
547 if (c.owner.kind != MTH && // neither a local class
548 c.name != names.empty) // nor anonymous
549 return 0;
550
551 int alenIdx = writeAttr(attributeName);
552 ClassSymbol enclClass = c.owner.enclClass();
553 MethodSymbol enclMethod =
554 (c.owner.type == null // local to init block
555 || c.owner.kind != MTH) // or member init
556 ? null
557 : (MethodSymbol)c.owner;
558 databuf.appendChar(pool.put(enclClass));
559 databuf.appendChar(enclMethod == null ? 0 : pool.put(nameType(c.owner)));
560 endAttr(alenIdx);
561 return 1;
562 }
563
564 /** Write flag attributes; return number of attributes written.
565 */
566 int writeFlagAttrs(long flags) {
567 int acount = 0;
568 if ((flags & DEPRECATED) != 0) {
569 int alenIdx = writeAttr(names.Deprecated);
570 endAttr(alenIdx);
571 acount++;
572 }
573 return acount;
574 }
575
576 /** Write member (field or method) attributes;
577 * return number of attributes written.
578 */
579 int writeMemberAttrs(Symbol sym) {
580 int acount = writeFlagAttrs(sym.flags());
581 long flags = sym.flags();
582 if ((flags & (SYNTHETIC | BRIDGE)) != SYNTHETIC &&
583 (flags & ANONCONSTR) == 0 &&
584 (!types.isSameType(sym.type, sym.erasure(types)) ||
585 signatureGen.hasTypeVar(sym.type.getThrownTypes()))) {
586 // note that a local class with captured variables
587 // will get a signature attribute
588 int alenIdx = writeAttr(names.Signature);
589 databuf.appendChar(pool.put(typeSig(sym.type)));
590 endAttr(alenIdx);
591 acount++;
592 }
593 acount += writeJavaAnnotations(sym.getRawAttributes());
594 acount += writeTypeAnnotations(sym.getRawTypeAttributes(), false);
595 return acount;
596 }
597
598 /**
599 * Write method parameter names attribute.
600 */
601 int writeMethodParametersAttr(MethodSymbol m) {
602 MethodType ty = m.externalType(types).asMethodType();
603 final int allparams = ty.argtypes.size();
604 if (m.params != null && allparams != 0) {
605 final int attrIndex = writeAttr(names.MethodParameters);
606 databuf.appendByte(allparams);
607 // Write extra parameters first
608 for (VarSymbol s : m.extraParams) {
609 final int flags =
610 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
611 ((int) m.flags() & SYNTHETIC);
612 databuf.appendChar(pool.put(s.name));
613 databuf.appendChar(flags);
614 }
615 // Now write the real parameters
616 for (VarSymbol s : m.params) {
617 final int flags =
618 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
619 ((int) m.flags() & SYNTHETIC);
620 databuf.appendChar(pool.put(s.name));
621 databuf.appendChar(flags);
622 }
623 // Now write the captured locals
624 for (VarSymbol s : m.capturedLocals) {
625 final int flags =
626 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
627 ((int) m.flags() & SYNTHETIC);
628 databuf.appendChar(pool.put(s.name));
629 databuf.appendChar(flags);
630 }
631 endAttr(attrIndex);
632 return 1;
633 } else
634 return 0;
635 }
636
637
638 private void writeParamAnnotations(List<VarSymbol> params,
639 RetentionPolicy retention) {
640 for (VarSymbol s : params) {
641 ListBuffer<Attribute.Compound> buf = new ListBuffer<>();
642 for (Attribute.Compound a : s.getRawAttributes())
643 if (types.getRetention(a) == retention)
644 buf.append(a);
645 databuf.appendChar(buf.length());
646 for (Attribute.Compound a : buf)
647 writeCompoundAttribute(a);
648 }
649
650 }
651
652 private void writeParamAnnotations(MethodSymbol m,
653 RetentionPolicy retention) {
654 databuf.appendByte(m.params.length());
655 writeParamAnnotations(m.params, retention);
656 }
657
658 /** Write method parameter annotations;
659 * return number of attributes written.
660 */
661 int writeParameterAttrs(MethodSymbol m) {
662 boolean hasVisible = false;
663 boolean hasInvisible = false;
664 if (m.params != null) {
665 for (VarSymbol s : m.params) {
666 for (Attribute.Compound a : s.getRawAttributes()) {
667 switch (types.getRetention(a)) {
668 case SOURCE: break;
669 case CLASS: hasInvisible = true; break;
670 case RUNTIME: hasVisible = true; break;
671 default: // /* fail soft */ throw new AssertionError(vis);
672 }
673 }
674 }
675 }
676
677 int attrCount = 0;
678 if (hasVisible) {
679 int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations);
680 writeParamAnnotations(m, RetentionPolicy.RUNTIME);
681 endAttr(attrIndex);
682 attrCount++;
683 }
684 if (hasInvisible) {
685 int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations);
686 writeParamAnnotations(m, RetentionPolicy.CLASS);
687 endAttr(attrIndex);
688 attrCount++;
689 }
690 return attrCount;
691 }
692
693 /**********************************************************************
694 * Writing Java-language annotations (aka metadata, attributes)
695 **********************************************************************/
696
697 /** Write Java-language annotations; return number of JVM
698 * attributes written (zero or one).
699 */
700 int writeJavaAnnotations(List<Attribute.Compound> attrs) {
701 if (attrs.isEmpty()) return 0;
702 ListBuffer<Attribute.Compound> visibles = new ListBuffer<>();
703 ListBuffer<Attribute.Compound> invisibles = new ListBuffer<>();
704 for (Attribute.Compound a : attrs) {
705 switch (types.getRetention(a)) {
706 case SOURCE: break;
707 case CLASS: invisibles.append(a); break;
708 case RUNTIME: visibles.append(a); break;
709 default: // /* fail soft */ throw new AssertionError(vis);
710 }
711 }
712
713 int attrCount = 0;
714 if (visibles.length() != 0) {
715 int attrIndex = writeAttr(names.RuntimeVisibleAnnotations);
716 databuf.appendChar(visibles.length());
717 for (Attribute.Compound a : visibles)
718 writeCompoundAttribute(a);
719 endAttr(attrIndex);
720 attrCount++;
721 }
722 if (invisibles.length() != 0) {
723 int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations);
724 databuf.appendChar(invisibles.length());
725 for (Attribute.Compound a : invisibles)
726 writeCompoundAttribute(a);
727 endAttr(attrIndex);
728 attrCount++;
729 }
730 return attrCount;
731 }
732
733 int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos, boolean inCode) {
734 if (typeAnnos.isEmpty()) return 0;
735
736 ListBuffer<Attribute.TypeCompound> visibles = new ListBuffer<>();
737 ListBuffer<Attribute.TypeCompound> invisibles = new ListBuffer<>();
738
739 for (Attribute.TypeCompound tc : typeAnnos) {
740 if (tc.hasUnknownPosition()) {
741 boolean fixed = tc.tryFixPosition();
742
743 // Could we fix it?
744 if (!fixed) {
745 // This happens for nested types like @A Outer. @B Inner.
746 // For method parameters we get the annotation twice! Once with
747 // a valid position, once unknown.
748 // TODO: find a cleaner solution.
749 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
750 pw.println("ClassWriter: Position UNKNOWN in type annotation: " + tc);
751 continue;
752 }
753 }
754
755 if (tc.position.type.isLocal() != inCode)
756 continue;
757 if (!tc.position.emitToClassfile())
758 continue;
759 switch (types.getRetention(tc)) {
760 case SOURCE: break;
761 case CLASS: invisibles.append(tc); break;
762 case RUNTIME: visibles.append(tc); break;
763 default: // /* fail soft */ throw new AssertionError(vis);
764 }
765 }
766
767 int attrCount = 0;
768 if (visibles.length() != 0) {
769 int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations);
770 databuf.appendChar(visibles.length());
771 for (Attribute.TypeCompound p : visibles)
772 writeTypeAnnotation(p);
773 endAttr(attrIndex);
774 attrCount++;
775 }
776
777 if (invisibles.length() != 0) {
778 int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations);
779 databuf.appendChar(invisibles.length());
780 for (Attribute.TypeCompound p : invisibles)
781 writeTypeAnnotation(p);
782 endAttr(attrIndex);
783 attrCount++;
784 }
785
786 return attrCount;
787 }
788
789 /** A visitor to write an attribute including its leading
790 * single-character marker.
791 */
792 class AttributeWriter implements Attribute.Visitor {
793 public void visitConstant(Attribute.Constant _value) {
794 Object value = _value.value;
795 switch (_value.type.getTag()) {
796 case BYTE:
797 databuf.appendByte('B');
798 break;
799 case CHAR:
800 databuf.appendByte('C');
801 break;
802 case SHORT:
803 databuf.appendByte('S');
804 break;
805 case INT:
806 databuf.appendByte('I');
807 break;
808 case LONG:
809 databuf.appendByte('J');
810 break;
811 case FLOAT:
812 databuf.appendByte('F');
813 break;
814 case DOUBLE:
815 databuf.appendByte('D');
816 break;
817 case BOOLEAN:
818 databuf.appendByte('Z');
819 break;
820 case CLASS:
821 Assert.check(value instanceof String);
822 databuf.appendByte('s');
823 value = names.fromString(value.toString()); // CONSTANT_Utf8
824 break;
825 default:
826 throw new AssertionError(_value.type);
827 }
828 databuf.appendChar(pool.put(value));
829 }
830 public void visitEnum(Attribute.Enum e) {
831 databuf.appendByte('e');
832 databuf.appendChar(pool.put(typeSig(e.value.type)));
833 databuf.appendChar(pool.put(e.value.name));
834 }
835 public void visitClass(Attribute.Class clazz) {
836 databuf.appendByte('c');
837 databuf.appendChar(pool.put(typeSig(types.erasure(clazz.classType))));
838 }
839 public void visitCompound(Attribute.Compound compound) {
840 databuf.appendByte('@');
841 writeCompoundAttribute(compound);
842 }
843 public void visitError(Attribute.Error x) {
844 throw new AssertionError(x);
845 }
846 public void visitArray(Attribute.Array array) {
847 databuf.appendByte('[');
848 databuf.appendChar(array.values.length);
849 for (Attribute a : array.values) {
850 a.accept(this);
851 }
852 }
853 }
854 AttributeWriter awriter = new AttributeWriter();
855
856 /** Write a compound attribute excluding the '@' marker. */
857 void writeCompoundAttribute(Attribute.Compound c) {
858 databuf.appendChar(pool.put(typeSig(c.type)));
859 databuf.appendChar(c.values.length());
860 for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) {
861 databuf.appendChar(pool.put(p.fst.name));
862 p.snd.accept(awriter);
863 }
864 }
865
866 void writeTypeAnnotation(Attribute.TypeCompound c) {
867 writePosition(c.position);
868 writeCompoundAttribute(c);
869 }
870
871 void writePosition(TypeAnnotationPosition p) {
872 databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte
873 switch (p.type) {
874 // instanceof
875 case INSTANCEOF:
876 // new expression
877 case NEW:
878 // constructor/method reference receiver
879 case CONSTRUCTOR_REFERENCE:
880 case METHOD_REFERENCE:
881 databuf.appendChar(p.offset);
882 break;
883 // local variable
884 case LOCAL_VARIABLE:
885 // resource variable
886 case RESOURCE_VARIABLE:
887 databuf.appendChar(p.lvarOffset.length); // for table length
888 for (int i = 0; i < p.lvarOffset.length; ++i) {
889 databuf.appendChar(p.lvarOffset[i]);
890 databuf.appendChar(p.lvarLength[i]);
891 databuf.appendChar(p.lvarIndex[i]);
892 }
893 break;
894 // exception parameter
895 case EXCEPTION_PARAMETER:
896 databuf.appendChar(p.getExceptionIndex());
897 break;
898 // method receiver
899 case METHOD_RECEIVER:
900 // Do nothing
901 break;
902 // type parameter
903 case CLASS_TYPE_PARAMETER:
904 case METHOD_TYPE_PARAMETER:
905 databuf.appendByte(p.parameter_index);
906 break;
907 // type parameter bound
908 case CLASS_TYPE_PARAMETER_BOUND:
909 case METHOD_TYPE_PARAMETER_BOUND:
910 databuf.appendByte(p.parameter_index);
911 databuf.appendByte(p.bound_index);
912 break;
913 // class extends or implements clause
914 case CLASS_EXTENDS:
915 databuf.appendChar(p.type_index);
916 break;
917 // throws
918 case THROWS:
919 databuf.appendChar(p.type_index);
920 break;
921 // method parameter
922 case METHOD_FORMAL_PARAMETER:
923 databuf.appendByte(p.parameter_index);
924 break;
925 // type cast
926 case CAST:
927 // method/constructor/reference type argument
928 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT:
929 case METHOD_INVOCATION_TYPE_ARGUMENT:
930 case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT:
931 case METHOD_REFERENCE_TYPE_ARGUMENT:
932 databuf.appendChar(p.offset);
933 databuf.appendByte(p.type_index);
934 break;
935 // We don't need to worry about these
936 case METHOD_RETURN:
937 case FIELD:
938 break;
939 case UNKNOWN:
940 throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!");
941 default:
942 throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p);
943 }
944
945 { // Append location data for generics/arrays.
946 databuf.appendByte(p.location.size());
947 java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location);
948 for (int i : loc)
949 databuf.appendByte((byte)i);
950 }
951 }
952
953 /**********************************************************************
954 * Writing module attributes
955 **********************************************************************/
956
957 /** Write the Module attribute if needed.
958 * Returns the number of attributes written (0 or 1).
959 */
960 int writeModuleAttribute(ClassSymbol c) {
961 ModuleSymbol m = (ModuleSymbol) c.owner;
962
963 int alenIdx = writeAttr(names.Module);
964
965 databuf.appendChar(pool.put(m));
966 databuf.appendChar(ModuleFlags.value(m.flags)); // module_flags
967 databuf.appendChar(m.version != null ? pool.put(m.version) : 0);
968
969 ListBuffer<RequiresDirective> requires = new ListBuffer<>();
970 for (RequiresDirective r: m.requires) {
971 if (!r.flags.contains(RequiresFlag.EXTRA))
972 requires.add(r);
973 }
974 databuf.appendChar(requires.size());
975 for (RequiresDirective r: requires) {
976 databuf.appendChar(pool.put(r.module));
977 databuf.appendChar(RequiresFlag.value(r.flags));
978 databuf.appendChar(r.module.version != null ? pool.put(r.module.version) : 0);
979 }
980
981 List<ExportsDirective> exports = m.exports;
982 databuf.appendChar(exports.size());
983 for (ExportsDirective e: exports) {
984 databuf.appendChar(pool.put(e.packge));
985 databuf.appendChar(ExportsFlag.value(e.flags));
986 if (e.modules == null) {
987 databuf.appendChar(0);
988 } else {
989 databuf.appendChar(e.modules.size());
990 for (ModuleSymbol msym: e.modules) {
991 databuf.appendChar(pool.put(msym));
992 }
993 }
994 }
995
996 List<OpensDirective> opens = m.opens;
997 databuf.appendChar(opens.size());
998 for (OpensDirective o: opens) {
999 databuf.appendChar(pool.put(o.packge));
1000 databuf.appendChar(OpensFlag.value(o.flags));
1001 if (o.modules == null) {
1002 databuf.appendChar(0);
1003 } else {
1004 databuf.appendChar(o.modules.size());
1005 for (ModuleSymbol msym: o.modules) {
1006 databuf.appendChar(pool.put(msym));
1007 }
1008 }
1009 }
1010
1011 List<UsesDirective> uses = m.uses;
1012 databuf.appendChar(uses.size());
1013 for (UsesDirective s: uses) {
1014 databuf.appendChar(pool.put(s.service));
1015 }
1016
1017 // temporary fix to merge repeated provides clause for same service;
1018 // eventually this should be disallowed when analyzing the module,
1019 // so that each service type only appears once.
1020 Map<ClassSymbol, Set<ClassSymbol>> mergedProvides = new LinkedHashMap<>();
1021 for (ProvidesDirective p : m.provides) {
1022 mergedProvides.computeIfAbsent(p.service, s -> new LinkedHashSet<>()).addAll(p.impls);
1023 }
1024 databuf.appendChar(mergedProvides.size());
1025 mergedProvides.forEach((srvc, impls) -> {
1026 databuf.appendChar(pool.put(srvc));
1027 databuf.appendChar(impls.size());
1028 impls.forEach(impl -> databuf.appendChar(pool.put(impl)));
1029 });
1030
1031 endAttr(alenIdx);
1032 return 1;
1033 }
1034
1035 /**********************************************************************
1036 * Writing Objects
1037 **********************************************************************/
1038
1039 /** Enter an inner class into the `innerClasses' set/queue.
1040 */
1041 void enterInner(ClassSymbol c) {
1042 if (c.type.isCompound()) {
1043 if (c.type.isIntersection()) {
1044 types.directSupertypes(c.type).stream()
1045 .map(t -> (ClassSymbol) t.tsym)
1046 .forEach(this::enterInner);
1047 return;
1048 } else {
1049 throw new AssertionError("Unexpected compound type: " + c.type);
1050 }
1051 }
1052 try {
1053 c.complete();
1054 } catch (CompletionFailure ex) {
1055 System.err.println("error: " + c + ": " + ex.getMessage());
1056 throw ex;
1057 }
1058 if (!c.type.hasTag(CLASS)) return; // arrays
1059 if (pool != null && // pool might be null if called from xClassName
1060 c.owner.enclClass() != null &&
1061 (innerClasses == null || !innerClasses.contains(c))) {
1062 // log.errWriter.println("enter inner " + c);//DEBUG
1063 enterInner(c.owner.enclClass());
1064 pool.put(c);
1065 if (c.name != names.empty)
1066 pool.put(c.name);
1067 if (innerClasses == null) {
1068 innerClasses = new HashSet<>();
1069 innerClassesQueue = new ListBuffer<>();
1070 pool.put(names.InnerClasses);
1071 }
1072 innerClasses.add(c);
1073 innerClassesQueue.append(c);
1074 }
1075 }
1076
1077 /** Write "inner classes" attribute.
1078 */
1079 void writeInnerClasses() {
1080 int alenIdx = writeAttr(names.InnerClasses);
1081 databuf.appendChar(innerClassesQueue.length());
1082 for (List<ClassSymbol> l = innerClassesQueue.toList();
1083 l.nonEmpty();
1084 l = l.tail) {
1085 ClassSymbol inner = l.head;
1086 inner.markAbstractIfNeeded(types);
1087 char flags = (char) adjustFlags(inner.flags_field);
1088 if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT
1089 flags &= ~STRICTFP; //inner classes should not have the strictfp flag set.
1090 if (dumpInnerClassModifiers) {
1091 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1092 pw.println("INNERCLASS " + inner.name);
1093 pw.println("---" + flagNames(flags));
1094 }
1095 databuf.appendChar(pool.get(inner));
1096 databuf.appendChar(
1097 inner.owner.kind == TYP && !inner.name.isEmpty() ? pool.get(inner.owner) : 0);
1098 databuf.appendChar(
1099 !inner.name.isEmpty() ? pool.get(inner.name) : 0);
1100 databuf.appendChar(flags);
1101 }
1102 endAttr(alenIdx);
1103 }
1104
1105 /** Write "bootstrapMethods" attribute.
1106 */
1107 void writeBootstrapMethods() {
1108 int alenIdx = writeAttr(names.BootstrapMethods);
1109 databuf.appendChar(bootstrapMethods.size());
1110 for (Map.Entry<DynamicMethod.BootstrapMethodsKey, DynamicMethod.BootstrapMethodsValue> entry : bootstrapMethods.entrySet()) {
1111 DynamicMethod.BootstrapMethodsKey bsmKey = entry.getKey();
1112 //write BSM handle
1113 databuf.appendChar(pool.get(entry.getValue().mh));
1114 Object[] uniqueArgs = bsmKey.getUniqueArgs();
1115 //write static args length
1116 databuf.appendChar(uniqueArgs.length);
1117 //write static args array
1118 for (Object o : uniqueArgs) {
1119 databuf.appendChar(pool.get(o));
1120 }
1121 }
1122 endAttr(alenIdx);
1123 }
1124
1125 /** Write field symbol, entering all references into constant pool.
1126 */
1127 void writeField(VarSymbol v) {
1128 int flags = adjustFlags(v.flags());
1129 databuf.appendChar(flags);
1130 if (dumpFieldModifiers) {
1131 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1132 pw.println("FIELD " + v.name);
1133 pw.println("---" + flagNames(v.flags()));
1134 }
1135 databuf.appendChar(pool.put(v.name));
1136 databuf.appendChar(pool.put(typeSig(v.erasure(types))));
1137 int acountIdx = beginAttrs();
1138 int acount = 0;
1139 if (v.getConstValue() != null) {
1140 int alenIdx = writeAttr(names.ConstantValue);
1141 databuf.appendChar(pool.put(v.getConstValue()));
1142 endAttr(alenIdx);
1143 acount++;
1144 }
1145 acount += writeMemberAttrs(v);
1146 endAttrs(acountIdx, acount);
1147 }
1148
1149 /** Write method symbol, entering all references into constant pool.
1150 */
1151 void writeMethod(MethodSymbol m) {
1152 int flags = adjustFlags(m.flags());
1153 databuf.appendChar(flags);
1154 if (dumpMethodModifiers) {
1155 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1156 pw.println("METHOD " + m.name);
1157 pw.println("---" + flagNames(m.flags()));
1158 }
1159 databuf.appendChar(pool.put(m.name));
1160 databuf.appendChar(pool.put(typeSig(m.externalType(types))));
1161 int acountIdx = beginAttrs();
1162 int acount = 0;
1163 if (m.code != null) {
1164 int alenIdx = writeAttr(names.Code);
1165 writeCode(m.code);
1166 m.code = null; // to conserve space
1167 endAttr(alenIdx);
1168 acount++;
1169 }
1170 List<Type> thrown = m.erasure(types).getThrownTypes();
1171 if (thrown.nonEmpty()) {
1172 int alenIdx = writeAttr(names.Exceptions);
1173 databuf.appendChar(thrown.length());
1174 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1175 databuf.appendChar(pool.put(l.head.tsym));
1176 endAttr(alenIdx);
1177 acount++;
1178 }
1179 if (m.defaultValue != null) {
1180 int alenIdx = writeAttr(names.AnnotationDefault);
1181 m.defaultValue.accept(awriter);
1182 endAttr(alenIdx);
1183 acount++;
1184 }
1185 if (options.isSet(PARAMETERS) && target.hasMethodParameters()) {
1186 if (!m.isLambdaMethod()) // Per JDK-8138729, do not emit parameters table for lambda bodies.
1187 acount += writeMethodParametersAttr(m);
1188 }
1189 acount += writeMemberAttrs(m);
1190 if (!m.isLambdaMethod())
1191 acount += writeParameterAttrs(m);
1192 endAttrs(acountIdx, acount);
1193 }
1194
1195 /** Write code attribute of method.
1196 */
1197 void writeCode(Code code) {
1198 databuf.appendChar(code.max_stack);
1199 databuf.appendChar(code.max_locals);
1200 databuf.appendInt(code.cp);
1201 databuf.appendBytes(code.code, 0, code.cp);
1202 databuf.appendChar(code.catchInfo.length());
1203 for (List<char[]> l = code.catchInfo.toList();
1204 l.nonEmpty();
1205 l = l.tail) {
1206 for (int i = 0; i < l.head.length; i++)
1207 databuf.appendChar(l.head[i]);
1208 }
1209 int acountIdx = beginAttrs();
1210 int acount = 0;
1211
1212 if (code.lineInfo.nonEmpty()) {
1213 int alenIdx = writeAttr(names.LineNumberTable);
1214 databuf.appendChar(code.lineInfo.length());
1215 for (List<char[]> l = code.lineInfo.reverse();
1216 l.nonEmpty();
1217 l = l.tail)
1218 for (int i = 0; i < l.head.length; i++)
1219 databuf.appendChar(l.head[i]);
1220 endAttr(alenIdx);
1221 acount++;
1222 }
1223
1224 if (genCrt && (code.crt != null)) {
1225 CRTable crt = code.crt;
1226 int alenIdx = writeAttr(names.CharacterRangeTable);
1227 int crtIdx = beginAttrs();
1228 int crtEntries = crt.writeCRT(databuf, code.lineMap, log);
1229 endAttrs(crtIdx, crtEntries);
1230 endAttr(alenIdx);
1231 acount++;
1232 }
1233
1234 // counter for number of generic local variables
1235 if (code.varDebugInfo && code.varBufferSize > 0) {
1236 int nGenericVars = 0;
1237 int alenIdx = writeAttr(names.LocalVariableTable);
1238 databuf.appendChar(code.getLVTSize());
1239 for (int i=0; i<code.varBufferSize; i++) {
1240 Code.LocalVar var = code.varBuffer[i];
1241
1242 for (Code.LocalVar.Range r: var.aliveRanges) {
1243 // write variable info
1244 Assert.check(r.start_pc >= 0
1245 && r.start_pc <= code.cp);
1246 databuf.appendChar(r.start_pc);
1247 Assert.check(r.length > 0
1248 && (r.start_pc + r.length) <= code.cp);
1249 databuf.appendChar(r.length);
1250 VarSymbol sym = var.sym;
1251 databuf.appendChar(pool.put(sym.name));
1252 Type vartype = sym.erasure(types);
1253 databuf.appendChar(pool.put(typeSig(vartype)));
1254 databuf.appendChar(var.reg);
1255 if (needsLocalVariableTypeEntry(var.sym.type)) {
1256 nGenericVars++;
1257 }
1258 }
1259 }
1260 endAttr(alenIdx);
1261 acount++;
1262
1263 if (nGenericVars > 0) {
1264 alenIdx = writeAttr(names.LocalVariableTypeTable);
1265 databuf.appendChar(nGenericVars);
1266 int count = 0;
1267
1268 for (int i=0; i<code.varBufferSize; i++) {
1269 Code.LocalVar var = code.varBuffer[i];
1270 VarSymbol sym = var.sym;
1271 if (!needsLocalVariableTypeEntry(sym.type))
1272 continue;
1273 for (Code.LocalVar.Range r : var.aliveRanges) {
1274 // write variable info
1275 databuf.appendChar(r.start_pc);
1276 databuf.appendChar(r.length);
1277 databuf.appendChar(pool.put(sym.name));
1278 databuf.appendChar(pool.put(typeSig(sym.type)));
1279 databuf.appendChar(var.reg);
1280 count++;
1281 }
1282 }
1283 Assert.check(count == nGenericVars);
1284 endAttr(alenIdx);
1285 acount++;
1286 }
1287 }
1288
1289 if (code.stackMapBufferSize > 0) {
1290 if (debugstackmap) System.out.println("Stack map for " + code.meth);
1291 int alenIdx = writeAttr(code.stackMap.getAttributeName(names));
1292 writeStackMap(code);
1293 endAttr(alenIdx);
1294 acount++;
1295 }
1296
1297 acount += writeTypeAnnotations(code.meth.getRawTypeAttributes(), true);
1298
1299 endAttrs(acountIdx, acount);
1300 }
1301 //where
1302 private boolean needsLocalVariableTypeEntry(Type t) {
1303 //a local variable needs a type-entry if its type T is generic
1304 //(i.e. |T| != T) and if it's not an intersection type (not supported
1305 //in signature attribute grammar)
1306 return (!types.isSameType(t, types.erasure(t)) &&
1307 !t.isCompound());
1308 }
1309
1310 void writeStackMap(Code code) {
1311 int nframes = code.stackMapBufferSize;
1312 if (debugstackmap) System.out.println(" nframes = " + nframes);
1313 databuf.appendChar(nframes);
1314
1315 switch (code.stackMap) {
1316 case CLDC:
1317 for (int i=0; i<nframes; i++) {
1318 if (debugstackmap) System.out.print(" " + i + ":");
1319 Code.StackMapFrame frame = code.stackMapBuffer[i];
1320
1321 // output PC
1322 if (debugstackmap) System.out.print(" pc=" + frame.pc);
1323 databuf.appendChar(frame.pc);
1324
1325 // output locals
1326 int localCount = 0;
1327 for (int j=0; j<frame.locals.length;
1328 j += Code.width(frame.locals[j])) {
1329 localCount++;
1330 }
1331 if (debugstackmap) System.out.print(" nlocals=" +
1332 localCount);
1333 databuf.appendChar(localCount);
1334 for (int j=0; j<frame.locals.length;
1335 j += Code.width(frame.locals[j])) {
1336 if (debugstackmap) System.out.print(" local[" + j + "]=");
1337 writeStackMapType(frame.locals[j]);
1338 }
1339
1340 // output stack
1341 int stackCount = 0;
1342 for (int j=0; j<frame.stack.length;
1343 j += Code.width(frame.stack[j])) {
1344 stackCount++;
1345 }
1346 if (debugstackmap) System.out.print(" nstack=" +
1347 stackCount);
1348 databuf.appendChar(stackCount);
1349 for (int j=0; j<frame.stack.length;
1350 j += Code.width(frame.stack[j])) {
1351 if (debugstackmap) System.out.print(" stack[" + j + "]=");
1352 writeStackMapType(frame.stack[j]);
1353 }
1354 if (debugstackmap) System.out.println();
1355 }
1356 break;
1357 case JSR202: {
1358 Assert.checkNull(code.stackMapBuffer);
1359 for (int i=0; i<nframes; i++) {
1360 if (debugstackmap) System.out.print(" " + i + ":");
1361 StackMapTableFrame frame = code.stackMapTableBuffer[i];
1362 frame.write(this);
1363 if (debugstackmap) System.out.println();
1364 }
1365 break;
1366 }
1367 default:
1368 throw new AssertionError("Unexpected stackmap format value");
1369 }
1370 }
1371
1372 //where
1373 void writeStackMapType(Type t) {
1374 if (t == null) {
1375 if (debugstackmap) System.out.print("empty");
1376 databuf.appendByte(0);
1377 }
1378 else switch(t.getTag()) {
1379 case BYTE:
1380 case CHAR:
1381 case SHORT:
1382 case INT:
1383 case BOOLEAN:
1384 if (debugstackmap) System.out.print("int");
1385 databuf.appendByte(1);
1386 break;
1387 case FLOAT:
1388 if (debugstackmap) System.out.print("float");
1389 databuf.appendByte(2);
1390 break;
1391 case DOUBLE:
1392 if (debugstackmap) System.out.print("double");
1393 databuf.appendByte(3);
1394 break;
1395 case LONG:
1396 if (debugstackmap) System.out.print("long");
1397 databuf.appendByte(4);
1398 break;
1399 case BOT: // null
1400 if (debugstackmap) System.out.print("null");
1401 databuf.appendByte(5);
1402 break;
1403 case CLASS:
1404 case ARRAY:
1405 if (debugstackmap) System.out.print("object(" + t + ")");
1406 databuf.appendByte(7);
1407 databuf.appendChar(pool.put(t));
1408 break;
1409 case TYPEVAR:
1410 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")");
1411 databuf.appendByte(7);
1412 databuf.appendChar(pool.put(types.erasure(t).tsym));
1413 break;
1414 case UNINITIALIZED_THIS:
1415 if (debugstackmap) System.out.print("uninit_this");
1416 databuf.appendByte(6);
1417 break;
1418 case UNINITIALIZED_OBJECT:
1419 { UninitializedType uninitType = (UninitializedType)t;
1420 databuf.appendByte(8);
1421 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset);
1422 databuf.appendChar(uninitType.offset);
1423 }
1424 break;
1425 default:
1426 throw new AssertionError();
1427 }
1428 }
1429
1430 /** An entry in the JSR202 StackMapTable */
1431 abstract static class StackMapTableFrame {
1432 abstract int getFrameType();
1433
1434 void write(ClassWriter writer) {
1435 int frameType = getFrameType();
1436 writer.databuf.appendByte(frameType);
1437 if (writer.debugstackmap) System.out.print(" frame_type=" + frameType);
1438 }
1439
1440 static class SameFrame extends StackMapTableFrame {
1441 final int offsetDelta;
1442 SameFrame(int offsetDelta) {
1443 this.offsetDelta = offsetDelta;
1444 }
1445 int getFrameType() {
1446 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED;
1447 }
1448 @Override
1449 void write(ClassWriter writer) {
1450 super.write(writer);
1451 if (getFrameType() == SAME_FRAME_EXTENDED) {
1452 writer.databuf.appendChar(offsetDelta);
1453 if (writer.debugstackmap){
1454 System.out.print(" offset_delta=" + offsetDelta);
1455 }
1456 }
1457 }
1458 }
1459
1460 static class SameLocals1StackItemFrame extends StackMapTableFrame {
1461 final int offsetDelta;
1462 final Type stack;
1463 SameLocals1StackItemFrame(int offsetDelta, Type stack) {
1464 this.offsetDelta = offsetDelta;
1465 this.stack = stack;
1466 }
1467 int getFrameType() {
1468 return (offsetDelta < SAME_FRAME_SIZE) ?
1469 (SAME_FRAME_SIZE + offsetDelta) :
1470 SAME_LOCALS_1_STACK_ITEM_EXTENDED;
1471 }
1472 @Override
1473 void write(ClassWriter writer) {
1474 super.write(writer);
1475 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
1476 writer.databuf.appendChar(offsetDelta);
1477 if (writer.debugstackmap) {
1478 System.out.print(" offset_delta=" + offsetDelta);
1479 }
1480 }
1481 if (writer.debugstackmap) {
1482 System.out.print(" stack[" + 0 + "]=");
1483 }
1484 writer.writeStackMapType(stack);
1485 }
1486 }
1487
1488 static class ChopFrame extends StackMapTableFrame {
1489 final int frameType;
1490 final int offsetDelta;
1491 ChopFrame(int frameType, int offsetDelta) {
1492 this.frameType = frameType;
1493 this.offsetDelta = offsetDelta;
1494 }
1495 int getFrameType() { return frameType; }
1496 @Override
1497 void write(ClassWriter writer) {
1498 super.write(writer);
1499 writer.databuf.appendChar(offsetDelta);
1500 if (writer.debugstackmap) {
1501 System.out.print(" offset_delta=" + offsetDelta);
1502 }
1503 }
1504 }
1505
1506 static class AppendFrame extends StackMapTableFrame {
1507 final int frameType;
1508 final int offsetDelta;
1509 final Type[] locals;
1510 AppendFrame(int frameType, int offsetDelta, Type[] locals) {
1511 this.frameType = frameType;
1512 this.offsetDelta = offsetDelta;
1513 this.locals = locals;
1514 }
1515 int getFrameType() { return frameType; }
1516 @Override
1517 void write(ClassWriter writer) {
1518 super.write(writer);
1519 writer.databuf.appendChar(offsetDelta);
1520 if (writer.debugstackmap) {
1521 System.out.print(" offset_delta=" + offsetDelta);
1522 }
1523 for (int i=0; i<locals.length; i++) {
1524 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1525 writer.writeStackMapType(locals[i]);
1526 }
1527 }
1528 }
1529
1530 static class FullFrame extends StackMapTableFrame {
1531 final int offsetDelta;
1532 final Type[] locals;
1533 final Type[] stack;
1534 FullFrame(int offsetDelta, Type[] locals, Type[] stack) {
1535 this.offsetDelta = offsetDelta;
1536 this.locals = locals;
1537 this.stack = stack;
1538 }
1539 int getFrameType() { return FULL_FRAME; }
1540 @Override
1541 void write(ClassWriter writer) {
1542 super.write(writer);
1543 writer.databuf.appendChar(offsetDelta);
1544 writer.databuf.appendChar(locals.length);
1545 if (writer.debugstackmap) {
1546 System.out.print(" offset_delta=" + offsetDelta);
1547 System.out.print(" nlocals=" + locals.length);
1548 }
1549 for (int i=0; i<locals.length; i++) {
1550 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1551 writer.writeStackMapType(locals[i]);
1552 }
1553
1554 writer.databuf.appendChar(stack.length);
1555 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); }
1556 for (int i=0; i<stack.length; i++) {
1557 if (writer.debugstackmap) System.out.print(" stack[" + i + "]=");
1558 writer.writeStackMapType(stack[i]);
1559 }
1560 }
1561 }
1562
1563 /** Compare this frame with the previous frame and produce
1564 * an entry of compressed stack map frame. */
1565 static StackMapTableFrame getInstance(Code.StackMapFrame this_frame,
1566 int prev_pc,
1567 Type[] prev_locals,
1568 Types types) {
1569 Type[] locals = this_frame.locals;
1570 Type[] stack = this_frame.stack;
1571 int offset_delta = this_frame.pc - prev_pc - 1;
1572 if (stack.length == 1) {
1573 if (locals.length == prev_locals.length
1574 && compare(prev_locals, locals, types) == 0) {
1575 return new SameLocals1StackItemFrame(offset_delta, stack[0]);
1576 }
1577 } else if (stack.length == 0) {
1578 int diff_length = compare(prev_locals, locals, types);
1579 if (diff_length == 0) {
1580 return new SameFrame(offset_delta);
1581 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) {
1582 // APPEND
1583 Type[] local_diff = new Type[-diff_length];
1584 for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) {
1585 local_diff[j] = locals[i];
1586 }
1587 return new AppendFrame(SAME_FRAME_EXTENDED - diff_length,
1588 offset_delta,
1589 local_diff);
1590 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) {
1591 // CHOP
1592 return new ChopFrame(SAME_FRAME_EXTENDED - diff_length,
1593 offset_delta);
1594 }
1595 }
1596 // FULL_FRAME
1597 return new FullFrame(offset_delta, locals, stack);
1598 }
1599
1600 static boolean isInt(Type t) {
1601 return (t.getTag().isStrictSubRangeOf(INT) || t.hasTag(BOOLEAN));
1602 }
1603
1604 static boolean isSameType(Type t1, Type t2, Types types) {
1605 if (t1 == null) { return t2 == null; }
1606 if (t2 == null) { return false; }
1607
1608 if (isInt(t1) && isInt(t2)) { return true; }
1609
1610 if (t1.hasTag(UNINITIALIZED_THIS)) {
1611 return t2.hasTag(UNINITIALIZED_THIS);
1612 } else if (t1.hasTag(UNINITIALIZED_OBJECT)) {
1613 if (t2.hasTag(UNINITIALIZED_OBJECT)) {
1614 return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset;
1615 } else {
1616 return false;
1617 }
1618 } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) {
1619 return false;
1620 }
1621
1622 return types.isSameType(t1, t2);
1623 }
1624
1625 static int compare(Type[] arr1, Type[] arr2, Types types) {
1626 int diff_length = arr1.length - arr2.length;
1627 if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) {
1628 return Integer.MAX_VALUE;
1629 }
1630 int len = (diff_length > 0) ? arr2.length : arr1.length;
1631 for (int i=0; i<len; i++) {
1632 if (!isSameType(arr1[i], arr2[i], types)) {
1633 return Integer.MAX_VALUE;
1634 }
1635 }
1636 return diff_length;
1637 }
1638 }
1639
1640 void writeFields(Scope s) {
1641 // process them in reverse sibling order;
1642 // i.e., process them in declaration order.
1643 List<VarSymbol> vars = List.nil();
1644 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) {
1645 if (sym.kind == VAR) vars = vars.prepend((VarSymbol)sym);
1646 }
1647 while (vars.nonEmpty()) {
1648 writeField(vars.head);
1649 vars = vars.tail;
1650 }
1651 }
1652
1653 void writeMethods(Scope s) {
1654 List<MethodSymbol> methods = List.nil();
1655 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) {
1656 if (sym.kind == MTH && (sym.flags() & HYPOTHETICAL) == 0)
1657 methods = methods.prepend((MethodSymbol)sym);
1658 }
1659 while (methods.nonEmpty()) {
1660 writeMethod(methods.head);
1661 methods = methods.tail;
1662 }
1663 }
1664
1665 /** Emit a class file for a given class.
1666 * @param c The class from which a class file is generated.
1667 */
1668 public JavaFileObject writeClass(ClassSymbol c)
1669 throws IOException, PoolOverflow, StringOverflow
1670 {
1671 String name = (c.owner.kind == MDL ? c.name : c.flatname).toString();
1672 Location outLocn;
1673 if (multiModuleMode) {
1674 ModuleSymbol msym = c.owner.kind == MDL ? (ModuleSymbol) c.owner : c.packge().modle;
1675 outLocn = fileManager.getLocationForModule(CLASS_OUTPUT, msym.name.toString());
1676 } else {
1677 outLocn = CLASS_OUTPUT;
1678 }
1679 JavaFileObject outFile
1680 = fileManager.getJavaFileForOutput(outLocn,
1681 name,
1682 JavaFileObject.Kind.CLASS,
1683 c.sourcefile);
1684 OutputStream out = outFile.openOutputStream();
1685 try {
1686 writeClassFile(out, c);
1687 if (verbose)
1688 log.printVerbose("wrote.file", outFile.getName());
1689 out.close();
1690 out = null;
1691 } finally {
1692 if (out != null) {
1693 // if we are propagating an exception, delete the file
1694 out.close();
1695 outFile.delete();
1696 outFile = null;
1697 }
1698 }
1699 return outFile; // may be null if write failed
1700 }
1701
1702 /** Write class `c' to outstream `out'.
1703 */
1704 public void writeClassFile(OutputStream out, ClassSymbol c)
1705 throws IOException, PoolOverflow, StringOverflow {
1706 Assert.check((c.flags() & COMPOUND) == 0);
1707 databuf.reset();
1708 poolbuf.reset();
1709 signatureGen.reset();
1710 pool = c.pool;
1711 innerClasses = null;
1712 innerClassesQueue = null;
1713 bootstrapMethods = new LinkedHashMap<>();
1714
1715 Type supertype = types.supertype(c.type);
1716 List<Type> interfaces = types.interfaces(c.type);
1717 List<Type> typarams = c.type.getTypeArguments();
1718
1719 int flags;
1720 if (c.owner.kind == MDL) {
1721 flags = ACC_MODULE;
1722 } else {
1723 flags = adjustFlags(c.flags() & ~DEFAULT);
1724 if ((flags & PROTECTED) != 0) flags |= PUBLIC;
1725 flags = flags & ClassFlags & ~STRICTFP;
1726 if ((flags & INTERFACE) == 0) flags |= ACC_SUPER;
1727 }
1728
1729 if (dumpClassModifiers) {
1730 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1731 pw.println();
1732 pw.println("CLASSFILE " + c.getQualifiedName());
1733 pw.println("---" + flagNames(flags));
1734 }
1735 databuf.appendChar(flags);
1736
1737 if (c.owner.kind == MDL) {
1738 PackageSymbol unnamed = ((ModuleSymbol) c.owner).unnamedPackage;
1739 databuf.appendChar(pool.put(new ClassSymbol(0, names.module_info, unnamed)));
1740 } else {
1741 databuf.appendChar(pool.put(c));
1742 }
1743 databuf.appendChar(supertype.hasTag(CLASS) ? pool.put(supertype.tsym) : 0);
1744 databuf.appendChar(interfaces.length());
1745 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1746 databuf.appendChar(pool.put(l.head.tsym));
1747 int fieldsCount = 0;
1748 int methodsCount = 0;
1749 for (Symbol sym : c.members().getSymbols(NON_RECURSIVE)) {
1750 switch (sym.kind) {
1751 case VAR: fieldsCount++; break;
1752 case MTH: if ((sym.flags() & HYPOTHETICAL) == 0) methodsCount++;
1753 break;
1754 case TYP: enterInner((ClassSymbol)sym); break;
1755 default : Assert.error();
1756 }
1757 }
1758
1759 if (c.trans_local != null) {
1760 for (ClassSymbol local : c.trans_local) {
1761 enterInner(local);
1762 }
1763 }
1764
1765 databuf.appendChar(fieldsCount);
1766 writeFields(c.members());
1767 databuf.appendChar(methodsCount);
1768 writeMethods(c.members());
1769
1770 int acountIdx = beginAttrs();
1771 int acount = 0;
1772
1773 boolean sigReq =
1774 typarams.length() != 0 || supertype.allparams().length() != 0;
1775 for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail)
1776 sigReq = l.head.allparams().length() != 0;
1777 if (sigReq) {
1778 int alenIdx = writeAttr(names.Signature);
1779 if (typarams.length() != 0) signatureGen.assembleParamsSig(typarams);
1780 signatureGen.assembleSig(supertype);
1781 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1782 signatureGen.assembleSig(l.head);
1783 databuf.appendChar(pool.put(signatureGen.toName()));
1784 signatureGen.reset();
1785 endAttr(alenIdx);
1786 acount++;
1787 }
1788
1789 if (c.sourcefile != null && emitSourceFile) {
1790 int alenIdx = writeAttr(names.SourceFile);
1791 // WHM 6/29/1999: Strip file path prefix. We do it here at
1792 // the last possible moment because the sourcefile may be used
1793 // elsewhere in error diagnostics. Fixes 4241573.
1794 //databuf.appendChar(c.pool.put(c.sourcefile));
1795 String simpleName = PathFileObject.getSimpleName(c.sourcefile);
1796 databuf.appendChar(c.pool.put(names.fromString(simpleName)));
1797 endAttr(alenIdx);
1798 acount++;
1799 }
1800
1801 if (genCrt) {
1802 // Append SourceID attribute
1803 int alenIdx = writeAttr(names.SourceID);
1804 databuf.appendChar(c.pool.put(names.fromString(Long.toString(getLastModified(c.sourcefile)))));
1805 endAttr(alenIdx);
1806 acount++;
1807 // Append CompilationID attribute
1808 alenIdx = writeAttr(names.CompilationID);
1809 databuf.appendChar(c.pool.put(names.fromString(Long.toString(System.currentTimeMillis()))));
1810 endAttr(alenIdx);
1811 acount++;
1812 }
1813
1814 acount += writeFlagAttrs(c.flags());
1815 acount += writeJavaAnnotations(c.getRawAttributes());
1816 acount += writeTypeAnnotations(c.getRawTypeAttributes(), false);
1817 acount += writeEnclosingMethodAttribute(c);
1818 if (c.owner.kind == MDL) {
1819 acount += writeModuleAttribute(c);
1820 acount += writeFlagAttrs(c.owner.flags() & ~DEPRECATED);
1821 }
1822 acount += writeExtraClassAttributes(c);
1823
1824 poolbuf.appendInt(JAVA_MAGIC);
1825 poolbuf.appendChar(target.minorVersion);
1826 poolbuf.appendChar(target.majorVersion);
1827
1828 writePool(c.pool);
1829
1830 if (innerClasses != null) {
1831 writeInnerClasses();
1832 acount++;
1833 }
1834
1835 if (!bootstrapMethods.isEmpty()) {
1836 writeBootstrapMethods();
1837 acount++;
1838 }
1839
1840 endAttrs(acountIdx, acount);
1841
1842 poolbuf.appendBytes(databuf.elems, 0, databuf.length);
1843 out.write(poolbuf.elems, 0, poolbuf.length);
1844
1845 pool = c.pool = null; // to conserve space
1846 }
1847
1848 /**Allows subclasses to write additional class attributes
1849 *
1850 * @return the number of attributes written
1851 */
1852 protected int writeExtraClassAttributes(ClassSymbol c) {
1853 return 0;
1854 }
1855
1856 int adjustFlags(final long flags) {
1857 int result = (int)flags;
1858
1859 if ((flags & BRIDGE) != 0)
1860 result |= ACC_BRIDGE;
1861 if ((flags & VARARGS) != 0)
1862 result |= ACC_VARARGS;
1863 if ((flags & DEFAULT) != 0)
1864 result &= ~ABSTRACT;
1865 return result;
1866 }
1867
1868 long getLastModified(FileObject filename) {
1869 long mod = 0;
1870 try {
1871 mod = filename.getLastModified();
1872 } catch (SecurityException e) {
1873 throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage());
1874 }
1875 return mod;
1876 }
1877 }