1 /*
2 * Copyright (c) 1999, 2016, 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 throw new AssertionError("Unexpected intersection type: " + c.type);
1044 }
1045 try {
1046 c.complete();
1047 } catch (CompletionFailure ex) {
1048 System.err.println("error: " + c + ": " + ex.getMessage());
1049 throw ex;
1050 }
1051 if (!c.type.hasTag(CLASS)) return; // arrays
1052 if (pool != null && // pool might be null if called from xClassName
1053 c.owner.enclClass() != null &&
1054 (innerClasses == null || !innerClasses.contains(c))) {
1055 // log.errWriter.println("enter inner " + c);//DEBUG
1056 enterInner(c.owner.enclClass());
1057 pool.put(c);
1058 if (c.name != names.empty)
1059 pool.put(c.name);
1060 if (innerClasses == null) {
1061 innerClasses = new HashSet<>();
1062 innerClassesQueue = new ListBuffer<>();
1063 pool.put(names.InnerClasses);
1064 }
1065 innerClasses.add(c);
1066 innerClassesQueue.append(c);
1067 }
1068 }
1069
1070 /** Write "inner classes" attribute.
1071 */
1072 void writeInnerClasses() {
1073 int alenIdx = writeAttr(names.InnerClasses);
1074 databuf.appendChar(innerClassesQueue.length());
1075 for (List<ClassSymbol> l = innerClassesQueue.toList();
1076 l.nonEmpty();
1077 l = l.tail) {
1078 ClassSymbol inner = l.head;
1079 inner.markAbstractIfNeeded(types);
1080 char flags = (char) adjustFlags(inner.flags_field);
1081 if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT
1082 flags &= ~STRICTFP; //inner classes should not have the strictfp flag set.
1083 if (dumpInnerClassModifiers) {
1084 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1085 pw.println("INNERCLASS " + inner.name);
1086 pw.println("---" + flagNames(flags));
1087 }
1088 databuf.appendChar(pool.get(inner));
1089 databuf.appendChar(
1090 inner.owner.kind == TYP && !inner.name.isEmpty() ? pool.get(inner.owner) : 0);
1091 databuf.appendChar(
1092 !inner.name.isEmpty() ? pool.get(inner.name) : 0);
1093 databuf.appendChar(flags);
1094 }
1095 endAttr(alenIdx);
1096 }
1097
1098 /** Write "bootstrapMethods" attribute.
1099 */
1100 void writeBootstrapMethods() {
1101 int alenIdx = writeAttr(names.BootstrapMethods);
1102 databuf.appendChar(bootstrapMethods.size());
1103 for (Map.Entry<DynamicMethod.BootstrapMethodsKey, DynamicMethod.BootstrapMethodsValue> entry : bootstrapMethods.entrySet()) {
1104 DynamicMethod.BootstrapMethodsKey bsmKey = entry.getKey();
1105 //write BSM handle
1106 databuf.appendChar(pool.get(entry.getValue().mh));
1107 Object[] uniqueArgs = bsmKey.getUniqueArgs();
1108 //write static args length
1109 databuf.appendChar(uniqueArgs.length);
1110 //write static args array
1111 for (Object o : uniqueArgs) {
1112 databuf.appendChar(pool.get(o));
1113 }
1114 }
1115 endAttr(alenIdx);
1116 }
1117
1118 /** Write field symbol, entering all references into constant pool.
1119 */
1120 void writeField(VarSymbol v) {
1121 int flags = adjustFlags(v.flags());
1122 databuf.appendChar(flags);
1123 if (dumpFieldModifiers) {
1124 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1125 pw.println("FIELD " + v.name);
1126 pw.println("---" + flagNames(v.flags()));
1127 }
1128 databuf.appendChar(pool.put(v.name));
1129 databuf.appendChar(pool.put(typeSig(v.erasure(types))));
1130 int acountIdx = beginAttrs();
1131 int acount = 0;
1132 if (v.getConstValue() != null) {
1133 int alenIdx = writeAttr(names.ConstantValue);
1134 databuf.appendChar(pool.put(v.getConstValue()));
1135 endAttr(alenIdx);
1136 acount++;
1137 }
1138 acount += writeMemberAttrs(v);
1139 endAttrs(acountIdx, acount);
1140 }
1141
1142 /** Write method symbol, entering all references into constant pool.
1143 */
1144 void writeMethod(MethodSymbol m) {
1145 int flags = adjustFlags(m.flags());
1146 databuf.appendChar(flags);
1147 if (dumpMethodModifiers) {
1148 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1149 pw.println("METHOD " + m.name);
1150 pw.println("---" + flagNames(m.flags()));
1151 }
1152 databuf.appendChar(pool.put(m.name));
1153 databuf.appendChar(pool.put(typeSig(m.externalType(types))));
1154 int acountIdx = beginAttrs();
1155 int acount = 0;
1156 if (m.code != null) {
1157 int alenIdx = writeAttr(names.Code);
1158 writeCode(m.code);
1159 m.code = null; // to conserve space
1160 endAttr(alenIdx);
1161 acount++;
1162 }
1163 List<Type> thrown = m.erasure(types).getThrownTypes();
1164 if (thrown.nonEmpty()) {
1165 int alenIdx = writeAttr(names.Exceptions);
1166 databuf.appendChar(thrown.length());
1167 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1168 databuf.appendChar(pool.put(l.head.tsym));
1169 endAttr(alenIdx);
1170 acount++;
1171 }
1172 if (m.defaultValue != null) {
1173 int alenIdx = writeAttr(names.AnnotationDefault);
1174 m.defaultValue.accept(awriter);
1175 endAttr(alenIdx);
1176 acount++;
1177 }
1178 if (options.isSet(PARAMETERS)) {
1179 if (!m.isLambdaMethod()) // Per JDK-8138729, do not emit parameters table for lambda bodies.
1180 acount += writeMethodParametersAttr(m);
1181 }
1182 acount += writeMemberAttrs(m);
1183 if (!m.isLambdaMethod())
1184 acount += writeParameterAttrs(m);
1185 endAttrs(acountIdx, acount);
1186 }
1187
1188 /** Write code attribute of method.
1189 */
1190 void writeCode(Code code) {
1191 databuf.appendChar(code.max_stack);
1192 databuf.appendChar(code.max_locals);
1193 databuf.appendInt(code.cp);
1194 databuf.appendBytes(code.code, 0, code.cp);
1195 databuf.appendChar(code.catchInfo.length());
1196 for (List<char[]> l = code.catchInfo.toList();
1197 l.nonEmpty();
1198 l = l.tail) {
1199 for (int i = 0; i < l.head.length; i++)
1200 databuf.appendChar(l.head[i]);
1201 }
1202 int acountIdx = beginAttrs();
1203 int acount = 0;
1204
1205 if (code.lineInfo.nonEmpty()) {
1206 int alenIdx = writeAttr(names.LineNumberTable);
1207 databuf.appendChar(code.lineInfo.length());
1208 for (List<char[]> l = code.lineInfo.reverse();
1209 l.nonEmpty();
1210 l = l.tail)
1211 for (int i = 0; i < l.head.length; i++)
1212 databuf.appendChar(l.head[i]);
1213 endAttr(alenIdx);
1214 acount++;
1215 }
1216
1217 if (genCrt && (code.crt != null)) {
1218 CRTable crt = code.crt;
1219 int alenIdx = writeAttr(names.CharacterRangeTable);
1220 int crtIdx = beginAttrs();
1221 int crtEntries = crt.writeCRT(databuf, code.lineMap, log);
1222 endAttrs(crtIdx, crtEntries);
1223 endAttr(alenIdx);
1224 acount++;
1225 }
1226
1227 // counter for number of generic local variables
1228 if (code.varDebugInfo && code.varBufferSize > 0) {
1229 int nGenericVars = 0;
1230 int alenIdx = writeAttr(names.LocalVariableTable);
1231 databuf.appendChar(code.getLVTSize());
1232 for (int i=0; i<code.varBufferSize; i++) {
1233 Code.LocalVar var = code.varBuffer[i];
1234
1235 for (Code.LocalVar.Range r: var.aliveRanges) {
1236 // write variable info
1237 Assert.check(r.start_pc >= 0
1238 && r.start_pc <= code.cp);
1239 databuf.appendChar(r.start_pc);
1240 Assert.check(r.length > 0
1241 && (r.start_pc + r.length) <= code.cp);
1242 databuf.appendChar(r.length);
1243 VarSymbol sym = var.sym;
1244 databuf.appendChar(pool.put(sym.name));
1245 Type vartype = sym.erasure(types);
1246 databuf.appendChar(pool.put(typeSig(vartype)));
1247 databuf.appendChar(var.reg);
1248 if (needsLocalVariableTypeEntry(var.sym.type)) {
1249 nGenericVars++;
1250 }
1251 }
1252 }
1253 endAttr(alenIdx);
1254 acount++;
1255
1256 if (nGenericVars > 0) {
1257 alenIdx = writeAttr(names.LocalVariableTypeTable);
1258 databuf.appendChar(nGenericVars);
1259 int count = 0;
1260
1261 for (int i=0; i<code.varBufferSize; i++) {
1262 Code.LocalVar var = code.varBuffer[i];
1263 VarSymbol sym = var.sym;
1264 if (!needsLocalVariableTypeEntry(sym.type))
1265 continue;
1266 for (Code.LocalVar.Range r : var.aliveRanges) {
1267 // write variable info
1268 databuf.appendChar(r.start_pc);
1269 databuf.appendChar(r.length);
1270 databuf.appendChar(pool.put(sym.name));
1271 databuf.appendChar(pool.put(typeSig(sym.type)));
1272 databuf.appendChar(var.reg);
1273 count++;
1274 }
1275 }
1276 Assert.check(count == nGenericVars);
1277 endAttr(alenIdx);
1278 acount++;
1279 }
1280 }
1281
1282 if (code.stackMapBufferSize > 0) {
1283 if (debugstackmap) System.out.println("Stack map for " + code.meth);
1284 int alenIdx = writeAttr(code.stackMap.getAttributeName(names));
1285 writeStackMap(code);
1286 endAttr(alenIdx);
1287 acount++;
1288 }
1289
1290 acount += writeTypeAnnotations(code.meth.getRawTypeAttributes(), true);
1291
1292 endAttrs(acountIdx, acount);
1293 }
1294 //where
1295 private boolean needsLocalVariableTypeEntry(Type t) {
1296 //a local variable needs a type-entry if its type T is generic
1297 //(i.e. |T| != T) and if it's not an intersection type (not supported
1298 //in signature attribute grammar)
1299 return (!types.isSameType(t, types.erasure(t)) &&
1300 !t.isCompound());
1301 }
1302
1303 void writeStackMap(Code code) {
1304 int nframes = code.stackMapBufferSize;
1305 if (debugstackmap) System.out.println(" nframes = " + nframes);
1306 databuf.appendChar(nframes);
1307
1308 switch (code.stackMap) {
1309 case CLDC:
1310 for (int i=0; i<nframes; i++) {
1311 if (debugstackmap) System.out.print(" " + i + ":");
1312 Code.StackMapFrame frame = code.stackMapBuffer[i];
1313
1314 // output PC
1315 if (debugstackmap) System.out.print(" pc=" + frame.pc);
1316 databuf.appendChar(frame.pc);
1317
1318 // output locals
1319 int localCount = 0;
1320 for (int j=0; j<frame.locals.length;
1321 j += Code.width(frame.locals[j])) {
1322 localCount++;
1323 }
1324 if (debugstackmap) System.out.print(" nlocals=" +
1325 localCount);
1326 databuf.appendChar(localCount);
1327 for (int j=0; j<frame.locals.length;
1328 j += Code.width(frame.locals[j])) {
1329 if (debugstackmap) System.out.print(" local[" + j + "]=");
1330 writeStackMapType(frame.locals[j]);
1331 }
1332
1333 // output stack
1334 int stackCount = 0;
1335 for (int j=0; j<frame.stack.length;
1336 j += Code.width(frame.stack[j])) {
1337 stackCount++;
1338 }
1339 if (debugstackmap) System.out.print(" nstack=" +
1340 stackCount);
1341 databuf.appendChar(stackCount);
1342 for (int j=0; j<frame.stack.length;
1343 j += Code.width(frame.stack[j])) {
1344 if (debugstackmap) System.out.print(" stack[" + j + "]=");
1345 writeStackMapType(frame.stack[j]);
1346 }
1347 if (debugstackmap) System.out.println();
1348 }
1349 break;
1350 case JSR202: {
1351 Assert.checkNull(code.stackMapBuffer);
1352 for (int i=0; i<nframes; i++) {
1353 if (debugstackmap) System.out.print(" " + i + ":");
1354 StackMapTableFrame frame = code.stackMapTableBuffer[i];
1355 frame.write(this);
1356 if (debugstackmap) System.out.println();
1357 }
1358 break;
1359 }
1360 default:
1361 throw new AssertionError("Unexpected stackmap format value");
1362 }
1363 }
1364
1365 //where
1366 void writeStackMapType(Type t) {
1367 if (t == null) {
1368 if (debugstackmap) System.out.print("empty");
1369 databuf.appendByte(0);
1370 }
1371 else switch(t.getTag()) {
1372 case BYTE:
1373 case CHAR:
1374 case SHORT:
1375 case INT:
1376 case BOOLEAN:
1377 if (debugstackmap) System.out.print("int");
1378 databuf.appendByte(1);
1379 break;
1380 case FLOAT:
1381 if (debugstackmap) System.out.print("float");
1382 databuf.appendByte(2);
1383 break;
1384 case DOUBLE:
1385 if (debugstackmap) System.out.print("double");
1386 databuf.appendByte(3);
1387 break;
1388 case LONG:
1389 if (debugstackmap) System.out.print("long");
1390 databuf.appendByte(4);
1391 break;
1392 case BOT: // null
1393 if (debugstackmap) System.out.print("null");
1394 databuf.appendByte(5);
1395 break;
1396 case CLASS:
1397 case ARRAY:
1398 if (debugstackmap) System.out.print("object(" + t + ")");
1399 databuf.appendByte(7);
1400 databuf.appendChar(pool.put(t));
1401 break;
1402 case TYPEVAR:
1403 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")");
1404 databuf.appendByte(7);
1405 databuf.appendChar(pool.put(types.erasure(t).tsym));
1406 break;
1407 case UNINITIALIZED_THIS:
1408 if (debugstackmap) System.out.print("uninit_this");
1409 databuf.appendByte(6);
1410 break;
1411 case UNINITIALIZED_OBJECT:
1412 { UninitializedType uninitType = (UninitializedType)t;
1413 databuf.appendByte(8);
1414 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset);
1415 databuf.appendChar(uninitType.offset);
1416 }
1417 break;
1418 default:
1419 throw new AssertionError();
1420 }
1421 }
1422
1423 /** An entry in the JSR202 StackMapTable */
1424 abstract static class StackMapTableFrame {
1425 abstract int getFrameType();
1426
1427 void write(ClassWriter writer) {
1428 int frameType = getFrameType();
1429 writer.databuf.appendByte(frameType);
1430 if (writer.debugstackmap) System.out.print(" frame_type=" + frameType);
1431 }
1432
1433 static class SameFrame extends StackMapTableFrame {
1434 final int offsetDelta;
1435 SameFrame(int offsetDelta) {
1436 this.offsetDelta = offsetDelta;
1437 }
1438 int getFrameType() {
1439 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED;
1440 }
1441 @Override
1442 void write(ClassWriter writer) {
1443 super.write(writer);
1444 if (getFrameType() == SAME_FRAME_EXTENDED) {
1445 writer.databuf.appendChar(offsetDelta);
1446 if (writer.debugstackmap){
1447 System.out.print(" offset_delta=" + offsetDelta);
1448 }
1449 }
1450 }
1451 }
1452
1453 static class SameLocals1StackItemFrame extends StackMapTableFrame {
1454 final int offsetDelta;
1455 final Type stack;
1456 SameLocals1StackItemFrame(int offsetDelta, Type stack) {
1457 this.offsetDelta = offsetDelta;
1458 this.stack = stack;
1459 }
1460 int getFrameType() {
1461 return (offsetDelta < SAME_FRAME_SIZE) ?
1462 (SAME_FRAME_SIZE + offsetDelta) :
1463 SAME_LOCALS_1_STACK_ITEM_EXTENDED;
1464 }
1465 @Override
1466 void write(ClassWriter writer) {
1467 super.write(writer);
1468 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
1469 writer.databuf.appendChar(offsetDelta);
1470 if (writer.debugstackmap) {
1471 System.out.print(" offset_delta=" + offsetDelta);
1472 }
1473 }
1474 if (writer.debugstackmap) {
1475 System.out.print(" stack[" + 0 + "]=");
1476 }
1477 writer.writeStackMapType(stack);
1478 }
1479 }
1480
1481 static class ChopFrame extends StackMapTableFrame {
1482 final int frameType;
1483 final int offsetDelta;
1484 ChopFrame(int frameType, int offsetDelta) {
1485 this.frameType = frameType;
1486 this.offsetDelta = offsetDelta;
1487 }
1488 int getFrameType() { return frameType; }
1489 @Override
1490 void write(ClassWriter writer) {
1491 super.write(writer);
1492 writer.databuf.appendChar(offsetDelta);
1493 if (writer.debugstackmap) {
1494 System.out.print(" offset_delta=" + offsetDelta);
1495 }
1496 }
1497 }
1498
1499 static class AppendFrame extends StackMapTableFrame {
1500 final int frameType;
1501 final int offsetDelta;
1502 final Type[] locals;
1503 AppendFrame(int frameType, int offsetDelta, Type[] locals) {
1504 this.frameType = frameType;
1505 this.offsetDelta = offsetDelta;
1506 this.locals = locals;
1507 }
1508 int getFrameType() { return frameType; }
1509 @Override
1510 void write(ClassWriter writer) {
1511 super.write(writer);
1512 writer.databuf.appendChar(offsetDelta);
1513 if (writer.debugstackmap) {
1514 System.out.print(" offset_delta=" + offsetDelta);
1515 }
1516 for (int i=0; i<locals.length; i++) {
1517 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1518 writer.writeStackMapType(locals[i]);
1519 }
1520 }
1521 }
1522
1523 static class FullFrame extends StackMapTableFrame {
1524 final int offsetDelta;
1525 final Type[] locals;
1526 final Type[] stack;
1527 FullFrame(int offsetDelta, Type[] locals, Type[] stack) {
1528 this.offsetDelta = offsetDelta;
1529 this.locals = locals;
1530 this.stack = stack;
1531 }
1532 int getFrameType() { return FULL_FRAME; }
1533 @Override
1534 void write(ClassWriter writer) {
1535 super.write(writer);
1536 writer.databuf.appendChar(offsetDelta);
1537 writer.databuf.appendChar(locals.length);
1538 if (writer.debugstackmap) {
1539 System.out.print(" offset_delta=" + offsetDelta);
1540 System.out.print(" nlocals=" + locals.length);
1541 }
1542 for (int i=0; i<locals.length; i++) {
1543 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1544 writer.writeStackMapType(locals[i]);
1545 }
1546
1547 writer.databuf.appendChar(stack.length);
1548 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); }
1549 for (int i=0; i<stack.length; i++) {
1550 if (writer.debugstackmap) System.out.print(" stack[" + i + "]=");
1551 writer.writeStackMapType(stack[i]);
1552 }
1553 }
1554 }
1555
1556 /** Compare this frame with the previous frame and produce
1557 * an entry of compressed stack map frame. */
1558 static StackMapTableFrame getInstance(Code.StackMapFrame this_frame,
1559 int prev_pc,
1560 Type[] prev_locals,
1561 Types types) {
1562 Type[] locals = this_frame.locals;
1563 Type[] stack = this_frame.stack;
1564 int offset_delta = this_frame.pc - prev_pc - 1;
1565 if (stack.length == 1) {
1566 if (locals.length == prev_locals.length
1567 && compare(prev_locals, locals, types) == 0) {
1568 return new SameLocals1StackItemFrame(offset_delta, stack[0]);
1569 }
1570 } else if (stack.length == 0) {
1571 int diff_length = compare(prev_locals, locals, types);
1572 if (diff_length == 0) {
1573 return new SameFrame(offset_delta);
1574 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) {
1575 // APPEND
1576 Type[] local_diff = new Type[-diff_length];
1577 for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) {
1578 local_diff[j] = locals[i];
1579 }
1580 return new AppendFrame(SAME_FRAME_EXTENDED - diff_length,
1581 offset_delta,
1582 local_diff);
1583 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) {
1584 // CHOP
1585 return new ChopFrame(SAME_FRAME_EXTENDED - diff_length,
1586 offset_delta);
1587 }
1588 }
1589 // FULL_FRAME
1590 return new FullFrame(offset_delta, locals, stack);
1591 }
1592
1593 static boolean isInt(Type t) {
1594 return (t.getTag().isStrictSubRangeOf(INT) || t.hasTag(BOOLEAN));
1595 }
1596
1597 static boolean isSameType(Type t1, Type t2, Types types) {
1598 if (t1 == null) { return t2 == null; }
1599 if (t2 == null) { return false; }
1600
1601 if (isInt(t1) && isInt(t2)) { return true; }
1602
1603 if (t1.hasTag(UNINITIALIZED_THIS)) {
1604 return t2.hasTag(UNINITIALIZED_THIS);
1605 } else if (t1.hasTag(UNINITIALIZED_OBJECT)) {
1606 if (t2.hasTag(UNINITIALIZED_OBJECT)) {
1607 return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset;
1608 } else {
1609 return false;
1610 }
1611 } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) {
1612 return false;
1613 }
1614
1615 return types.isSameType(t1, t2);
1616 }
1617
1618 static int compare(Type[] arr1, Type[] arr2, Types types) {
1619 int diff_length = arr1.length - arr2.length;
1620 if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) {
1621 return Integer.MAX_VALUE;
1622 }
1623 int len = (diff_length > 0) ? arr2.length : arr1.length;
1624 for (int i=0; i<len; i++) {
1625 if (!isSameType(arr1[i], arr2[i], types)) {
1626 return Integer.MAX_VALUE;
1627 }
1628 }
1629 return diff_length;
1630 }
1631 }
1632
1633 void writeFields(Scope s) {
1634 // process them in reverse sibling order;
1635 // i.e., process them in declaration order.
1636 List<VarSymbol> vars = List.nil();
1637 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) {
1638 if (sym.kind == VAR) vars = vars.prepend((VarSymbol)sym);
1639 }
1640 while (vars.nonEmpty()) {
1641 writeField(vars.head);
1642 vars = vars.tail;
1643 }
1644 }
1645
1646 void writeMethods(Scope s) {
1647 List<MethodSymbol> methods = List.nil();
1648 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) {
1649 if (sym.kind == MTH && (sym.flags() & HYPOTHETICAL) == 0)
1650 methods = methods.prepend((MethodSymbol)sym);
1651 }
1652 while (methods.nonEmpty()) {
1653 writeMethod(methods.head);
1654 methods = methods.tail;
1655 }
1656 }
1657
1658 /** Emit a class file for a given class.
1659 * @param c The class from which a class file is generated.
1660 */
1661 public JavaFileObject writeClass(ClassSymbol c)
1662 throws IOException, PoolOverflow, StringOverflow
1663 {
1664 String name = (c.owner.kind == MDL ? c.name : c.flatname).toString();
1665 Location outLocn;
1666 if (multiModuleMode) {
1667 ModuleSymbol msym = c.owner.kind == MDL ? (ModuleSymbol) c.owner : c.packge().modle;
1668 outLocn = fileManager.getLocationForModule(CLASS_OUTPUT, msym.name.toString());
1669 } else {
1670 outLocn = CLASS_OUTPUT;
1671 }
1672 JavaFileObject outFile
1673 = fileManager.getJavaFileForOutput(outLocn,
1674 name,
1675 JavaFileObject.Kind.CLASS,
1676 c.sourcefile);
1677 OutputStream out = outFile.openOutputStream();
1678 try {
1679 writeClassFile(out, c);
1680 if (verbose)
1681 log.printVerbose("wrote.file", outFile);
1682 out.close();
1683 out = null;
1684 } finally {
1685 if (out != null) {
1686 // if we are propagating an exception, delete the file
1687 out.close();
1688 outFile.delete();
1689 outFile = null;
1690 }
1691 }
1692 return outFile; // may be null if write failed
1693 }
1694
1695 /** Write class `c' to outstream `out'.
1696 */
1697 public void writeClassFile(OutputStream out, ClassSymbol c)
1698 throws IOException, PoolOverflow, StringOverflow {
1699 Assert.check((c.flags() & COMPOUND) == 0);
1700 databuf.reset();
1701 poolbuf.reset();
1702 signatureGen.reset();
1703 pool = c.pool;
1704 innerClasses = null;
1705 innerClassesQueue = null;
1706 bootstrapMethods = new LinkedHashMap<>();
1707
1708 Type supertype = types.supertype(c.type);
1709 List<Type> interfaces = types.interfaces(c.type);
1710 List<Type> typarams = c.type.getTypeArguments();
1711
1712 int flags;
1713 if (c.owner.kind == MDL) {
1714 flags = ACC_MODULE;
1715 } else {
1716 flags = adjustFlags(c.flags() & ~DEFAULT);
1717 if ((flags & PROTECTED) != 0) flags |= PUBLIC;
1718 flags = flags & ClassFlags & ~STRICTFP;
1719 if ((flags & INTERFACE) == 0) flags |= ACC_SUPER;
1720 }
1721
1722 if (dumpClassModifiers) {
1723 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1724 pw.println();
1725 pw.println("CLASSFILE " + c.getQualifiedName());
1726 pw.println("---" + flagNames(flags));
1727 }
1728 databuf.appendChar(flags);
1729
1730 if (c.owner.kind == MDL) {
1731 PackageSymbol unnamed = ((ModuleSymbol) c.owner).unnamedPackage;
1732 databuf.appendChar(pool.put(new ClassSymbol(0, names.module_info, unnamed)));
1733 } else {
1734 databuf.appendChar(pool.put(c));
1735 }
1736 databuf.appendChar(supertype.hasTag(CLASS) ? pool.put(supertype.tsym) : 0);
1737 databuf.appendChar(interfaces.length());
1738 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1739 databuf.appendChar(pool.put(l.head.tsym));
1740 int fieldsCount = 0;
1741 int methodsCount = 0;
1742 for (Symbol sym : c.members().getSymbols(NON_RECURSIVE)) {
1743 switch (sym.kind) {
1744 case VAR: fieldsCount++; break;
1745 case MTH: if ((sym.flags() & HYPOTHETICAL) == 0) methodsCount++;
1746 break;
1747 case TYP: enterInner((ClassSymbol)sym); break;
1748 default : Assert.error();
1749 }
1750 }
1751
1752 if (c.trans_local != null) {
1753 for (ClassSymbol local : c.trans_local) {
1754 enterInner(local);
1755 }
1756 }
1757
1758 databuf.appendChar(fieldsCount);
1759 writeFields(c.members());
1760 databuf.appendChar(methodsCount);
1761 writeMethods(c.members());
1762
1763 int acountIdx = beginAttrs();
1764 int acount = 0;
1765
1766 boolean sigReq =
1767 typarams.length() != 0 || supertype.allparams().length() != 0;
1768 for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail)
1769 sigReq = l.head.allparams().length() != 0;
1770 if (sigReq) {
1771 int alenIdx = writeAttr(names.Signature);
1772 if (typarams.length() != 0) signatureGen.assembleParamsSig(typarams);
1773 signatureGen.assembleSig(supertype);
1774 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1775 signatureGen.assembleSig(l.head);
1776 databuf.appendChar(pool.put(signatureGen.toName()));
1777 signatureGen.reset();
1778 endAttr(alenIdx);
1779 acount++;
1780 }
1781
1782 if (c.sourcefile != null && emitSourceFile) {
1783 int alenIdx = writeAttr(names.SourceFile);
1784 // WHM 6/29/1999: Strip file path prefix. We do it here at
1785 // the last possible moment because the sourcefile may be used
1786 // elsewhere in error diagnostics. Fixes 4241573.
1787 //databuf.appendChar(c.pool.put(c.sourcefile));
1788 String simpleName = PathFileObject.getSimpleName(c.sourcefile);
1789 databuf.appendChar(c.pool.put(names.fromString(simpleName)));
1790 endAttr(alenIdx);
1791 acount++;
1792 }
1793
1794 if (genCrt) {
1795 // Append SourceID attribute
1796 int alenIdx = writeAttr(names.SourceID);
1797 databuf.appendChar(c.pool.put(names.fromString(Long.toString(getLastModified(c.sourcefile)))));
1798 endAttr(alenIdx);
1799 acount++;
1800 // Append CompilationID attribute
1801 alenIdx = writeAttr(names.CompilationID);
1802 databuf.appendChar(c.pool.put(names.fromString(Long.toString(System.currentTimeMillis()))));
1803 endAttr(alenIdx);
1804 acount++;
1805 }
1806
1807 acount += writeFlagAttrs(c.flags());
1808 acount += writeJavaAnnotations(c.getRawAttributes());
1809 acount += writeTypeAnnotations(c.getRawTypeAttributes(), false);
1810 acount += writeEnclosingMethodAttribute(c);
1811 if (c.owner.kind == MDL) {
1812 acount += writeModuleAttribute(c);
1813 acount += writeFlagAttrs(c.owner.flags());
1814 }
1815 acount += writeExtraClassAttributes(c);
1816
1817 poolbuf.appendInt(JAVA_MAGIC);
1818
1819 if (c.owner.kind == MDL) {
1820 // temporarily overide to force use of v53 for module-info.class
1821 poolbuf.appendChar(0);
1822 poolbuf.appendChar(53);
1823 } else {
1824 poolbuf.appendChar(target.minorVersion);
1825 poolbuf.appendChar(target.majorVersion);
1826 }
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 }