1 /*
2 * Copyright (c) 1999, 2023, 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.LinkedHashSet;
33 import java.util.function.ToIntFunction;
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.SignatureGenerator.InvalidSignatureException;
46 import com.sun.tools.javac.comp.Check;
47 import com.sun.tools.javac.file.PathFileObject;
48 import com.sun.tools.javac.jvm.PoolConstant.LoadableConstant;
49 import com.sun.tools.javac.jvm.PoolConstant.Dynamic.BsmKey;
50 import com.sun.tools.javac.resources.CompilerProperties.Errors;
51 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
52 import com.sun.tools.javac.util.*;
53 import com.sun.tools.javac.util.List;
54
55 import static com.sun.tools.javac.code.Flags.*;
56 import static com.sun.tools.javac.code.Kinds.Kind.*;
57 import static com.sun.tools.javac.code.Scope.LookupKind.NON_RECURSIVE;
58 import static com.sun.tools.javac.code.TypeTag.*;
59 import static com.sun.tools.javac.main.Option.*;
60
61 import static javax.tools.StandardLocation.CLASS_OUTPUT;
62
63 /** This class provides operations to map an internal symbol table graph
64 * rooted in a ClassSymbol into a classfile.
65 *
66 * <p><b>This is NOT part of any supported API.
67 * If you write code that depends on this, you do so at your own risk.
68 * This code and its internal interfaces are subject to change or
69 * deletion without notice.</b>
70 */
71 public class ClassWriter extends ClassFile {
72 protected static final Context.Key<ClassWriter> classWriterKey = new Context.Key<>();
73
74 private final Options options;
75
76 /** Switch: verbose output.
77 */
78 private boolean verbose;
79
80 /** Switch: emit source file attribute.
81 */
82 private boolean emitSourceFile;
83
84 /** Switch: generate CharacterRangeTable attribute.
85 */
86 private boolean genCrt;
87
88 /** Switch: describe the generated stackmap.
89 */
90 private boolean debugstackmap;
91
92 /** Preview language level.
93 */
94 private Preview preview;
95
96 /**
97 * Target class version.
98 */
99 private Target target;
100
101 /**
102 * Source language version.
103 */
104 private Source source;
105
106 /** Type utilities. */
107 private Types types;
108
109 private Check check;
110
111 /**
112 * If true, class files will be written in module-specific subdirectories
113 * of the CLASS_OUTPUT location.
114 */
115 public boolean multiModuleMode;
116
117 private List<ToIntFunction<Symbol>> extraAttributeHooks = List.nil();
118
119 /** The initial sizes of the data and constant pool buffers.
120 * Sizes are increased when buffers get full.
121 */
122 static final int DATA_BUF_SIZE = 0x0fff0;
123 static final int CLASS_BUF_SIZE = 0x1fff0;
124
125 /** An output buffer for member info.
126 */
127 public ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE);
128
129 /** An output buffer for the constant pool.
130 */
131 ByteBuffer poolbuf = new ByteBuffer(CLASS_BUF_SIZE);
132
133 /** The constant pool writer.
134 */
135 final PoolWriter poolWriter;
136
137 /** The log to use for verbose output.
138 */
139 private final Log log;
140
141 /** The name table. */
142 private final Names names;
143
144 /** Access to files. */
145 private final JavaFileManager fileManager;
146
147 /** The tags and constants used in compressed stackmap. */
148 static final int SAME_FRAME_SIZE = 64;
149 static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247;
150 static final int SAME_FRAME_EXTENDED = 251;
151 static final int FULL_FRAME = 255;
152 static final int MAX_LOCAL_LENGTH_DIFF = 4;
153
154 /** Get the ClassWriter instance for this context. */
155 public static ClassWriter instance(Context context) {
156 ClassWriter instance = context.get(classWriterKey);
157 if (instance == null)
158 instance = new ClassWriter(context);
159 return instance;
160 }
161
162 /** Construct a class writer, given an options table.
163 */
164 @SuppressWarnings("this-escape")
165 protected ClassWriter(Context context) {
166 context.put(classWriterKey, this);
167
168 log = Log.instance(context);
169 names = Names.instance(context);
170 options = Options.instance(context);
171 preview = Preview.instance(context);
172 target = Target.instance(context);
173 source = Source.instance(context);
174 types = Types.instance(context);
175 check = Check.instance(context);
176 fileManager = context.get(JavaFileManager.class);
177 poolWriter = Gen.instance(context).poolWriter;
178
179 verbose = options.isSet(VERBOSE);
180 genCrt = options.isSet(XJCOV);
181 debugstackmap = options.isSet("debug.stackmap");
182
183 emitSourceFile = options.isUnset(G_CUSTOM) ||
184 options.isSet(G_CUSTOM, "source");
185
186 String modifierFlags = options.get("debug.dumpmodifiers");
187 if (modifierFlags != null) {
188 dumpClassModifiers = modifierFlags.indexOf('c') != -1;
189 dumpFieldModifiers = modifierFlags.indexOf('f') != -1;
190 dumpInnerClassModifiers = modifierFlags.indexOf('i') != -1;
191 dumpMethodModifiers = modifierFlags.indexOf('m') != -1;
192 }
193 }
194
195 public void addExtraAttributes(ToIntFunction<Symbol> addExtraAttributes) {
196 extraAttributeHooks = extraAttributeHooks.prepend(addExtraAttributes);
197 }
198
199 /* ****************************************************************
200 * Diagnostics: dump generated class names and modifiers
201 ******************************************************************/
202
203 /** Value of option 'dumpmodifiers' is a string
204 * indicating which modifiers should be dumped for debugging:
205 * 'c' -- classes
206 * 'f' -- fields
207 * 'i' -- innerclass attributes
208 * 'm' -- methods
209 * For example, to dump everything:
210 * javac -XDdumpmodifiers=cifm MyProg.java
211 */
212 private boolean dumpClassModifiers; // -XDdumpmodifiers=c
213 private boolean dumpFieldModifiers; // -XDdumpmodifiers=f
214 private boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i
215 private boolean dumpMethodModifiers; // -XDdumpmodifiers=m
216
217
218 /** Return flags as a string, separated by " ".
219 */
220 public static String flagNames(long flags) {
221 StringBuilder sbuf = new StringBuilder();
222 int i = 0;
223 long f = flags & StandardFlags;
224 while (f != 0) {
225 if ((f & 1) != 0) {
226 sbuf.append(" ");
227 sbuf.append(flagName[i]);
228 }
229 f = f >> 1;
230 i++;
231 }
232 return sbuf.toString();
233 }
234 //where
235 private static final String[] flagName = {
236 "PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL",
237 "SUPER", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE",
238 "ABSTRACT", "STRICTFP"};
239
240 /* ****************************************************************
241 * Output routines
242 ******************************************************************/
243
244 /** Write a character into given byte buffer;
245 * byte buffer will not be grown.
246 */
247 void putChar(ByteBuffer buf, int op, int x) {
248 buf.elems[op ] = (byte)((x >> 8) & 0xFF);
249 buf.elems[op+1] = (byte)((x ) & 0xFF);
250 }
251
252 /** Write an integer into given byte buffer;
253 * byte buffer will not be grown.
254 */
255 void putInt(ByteBuffer buf, int adr, int x) {
256 buf.elems[adr ] = (byte)((x >> 24) & 0xFF);
257 buf.elems[adr+1] = (byte)((x >> 16) & 0xFF);
258 buf.elems[adr+2] = (byte)((x >> 8) & 0xFF);
259 buf.elems[adr+3] = (byte)((x ) & 0xFF);
260 }
261
262 /* ****************************************************************
263 * Writing the Constant Pool
264 ******************************************************************/
265
266 /** Thrown when the constant pool is over full.
267 */
268 public static class PoolOverflow extends RuntimeException {
269 private static final long serialVersionUID = 0;
270 public PoolOverflow() {}
271 }
272 public static class StringOverflow extends RuntimeException {
273 private static final long serialVersionUID = 0;
274 public final String value;
275 public StringOverflow(String s) {
276 value = s;
277 }
278 }
279
280 /* ****************************************************************
281 * Writing Attributes
282 ******************************************************************/
283
284 /** Write header for an attribute to data buffer and return
285 * position past attribute length index.
286 */
287 public int writeAttr(Name attrName) {
288 int index = poolWriter.putName(attrName);
289 databuf.appendChar(index);
290 databuf.appendInt(0);
291 return databuf.length;
292 }
293
294 /** Fill in attribute length.
295 */
296 public void endAttr(int index) {
297 putInt(databuf, index - 4, databuf.length - index);
298 }
299
300 /** Leave space for attribute count and return index for
301 * number of attributes field.
302 */
303 int beginAttrs() {
304 databuf.appendChar(0);
305 return databuf.length;
306 }
307
308 /** Fill in number of attributes.
309 */
310 void endAttrs(int index, int count) {
311 putChar(databuf, index - 2, count);
312 }
313
314 /** Write the EnclosingMethod attribute if needed.
315 * Returns the number of attributes written (0 or 1).
316 */
317 int writeEnclosingMethodAttribute(ClassSymbol c) {
318 return writeEnclosingMethodAttribute(names.EnclosingMethod, c);
319 }
320
321 /** Write the EnclosingMethod attribute with a specified name.
322 * Returns the number of attributes written (0 or 1).
323 */
324 protected int writeEnclosingMethodAttribute(Name attributeName, ClassSymbol c) {
325 if (c.owner.kind != MTH && // neither a local class
326 c.name != names.empty) // nor anonymous
327 return 0;
328
329 int alenIdx = writeAttr(attributeName);
330 ClassSymbol enclClass = c.owner.enclClass();
331 MethodSymbol enclMethod =
332 ((c.owner.flags() & BLOCK) != 0 // local to init block
333 || c.owner.kind != MTH) // or member init
334 ? null
335 : ((MethodSymbol)c.owner).originalEnclosingMethod();
336 databuf.appendChar(poolWriter.putClass(enclClass));
337 databuf.appendChar(enclMethod == null ? 0 : poolWriter.putNameAndType(enclMethod));
338 endAttr(alenIdx);
339 return 1;
340 }
341
342 /** Write flag attributes; return number of attributes written.
343 */
344 int writeFlagAttrs(long flags) {
345 int acount = 0;
346 if ((flags & DEPRECATED) != 0) {
347 int alenIdx = writeAttr(names.Deprecated);
348 endAttr(alenIdx);
349 acount++;
350 }
351 return acount;
352 }
353
354 /** Write member (field or method) attributes;
355 * return number of attributes written.
356 */
357 int writeMemberAttrs(Symbol sym, boolean isRecordComponent) {
358 int acount = 0;
359 if (!isRecordComponent) {
360 acount = writeFlagAttrs(sym.flags());
361 }
362 long flags = sym.flags();
363 if ((flags & (SYNTHETIC | BRIDGE)) != SYNTHETIC &&
364 (flags & ANONCONSTR) == 0 &&
365 (!types.isSameType(sym.type, sym.erasure(types)) ||
366 poolWriter.signatureGen.hasTypeVar(sym.type.getThrownTypes()))) {
367 // note that a local class with captured variables
368 // will get a signature attribute
369 int alenIdx = writeAttr(names.Signature);
370 databuf.appendChar(poolWriter.putSignature(sym));
371 endAttr(alenIdx);
372 acount++;
373 }
374 acount += writeJavaAnnotations(sym.getRawAttributes());
375 acount += writeTypeAnnotations(sym.getRawTypeAttributes(), false);
376 return acount;
377 }
378
379 /**
380 * Write method parameter names attribute.
381 */
382 int writeMethodParametersAttr(MethodSymbol m, boolean writeParamNames) {
383 MethodType ty = m.externalType(types).asMethodType();
384 final int allparams = ty.argtypes.size();
385 if (m.params != null && allparams != 0) {
386 final int attrIndex = writeAttr(names.MethodParameters);
387 databuf.appendByte(allparams);
388 // Write extra parameters first
389 for (VarSymbol s : m.extraParams) {
390 final int flags =
391 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
392 ((int) m.flags() & SYNTHETIC);
393 if (writeParamNames)
394 databuf.appendChar(poolWriter.putName(s.name));
395 else
396 databuf.appendChar(0);
397 databuf.appendChar(flags);
398 }
399 // Now write the real parameters
400 for (VarSymbol s : m.params) {
401 final int flags =
402 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
403 ((int) m.flags() & SYNTHETIC);
404 if (writeParamNames)
405 databuf.appendChar(poolWriter.putName(s.name));
406 else
407 databuf.appendChar(0);
408 databuf.appendChar(flags);
409 }
410 // Now write the captured locals
411 for (VarSymbol s : m.capturedLocals) {
412 final int flags =
413 ((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
414 ((int) m.flags() & SYNTHETIC);
415 if (writeParamNames)
416 databuf.appendChar(poolWriter.putName(s.name));
417 else
418 databuf.appendChar(0);
419 databuf.appendChar(flags);
420 }
421 endAttr(attrIndex);
422 return 1;
423 } else
424 return 0;
425 }
426
427 private void writeParamAnnotations(List<VarSymbol> params,
428 RetentionPolicy retention) {
429 databuf.appendByte(params.length());
430 for (VarSymbol s : params) {
431 ListBuffer<Attribute.Compound> buf = new ListBuffer<>();
432 for (Attribute.Compound a : s.getRawAttributes())
433 if (types.getRetention(a) == retention)
434 buf.append(a);
435 databuf.appendChar(buf.length());
436 for (Attribute.Compound a : buf)
437 writeCompoundAttribute(a);
438 }
439
440 }
441
442 private void writeParamAnnotations(MethodSymbol m,
443 RetentionPolicy retention) {
444 databuf.appendByte(m.params.length());
445 writeParamAnnotations(m.params, retention);
446 }
447
448 /** Write method parameter annotations;
449 * return number of attributes written.
450 */
451 int writeParameterAttrs(List<VarSymbol> vars) {
452 boolean hasVisible = false;
453 boolean hasInvisible = false;
454 if (vars != null) {
455 for (VarSymbol s : vars) {
456 for (Attribute.Compound a : s.getRawAttributes()) {
457 switch (types.getRetention(a)) {
458 case SOURCE: break;
459 case CLASS: hasInvisible = true; break;
460 case RUNTIME: hasVisible = true; break;
461 default: // /* fail soft */ throw new AssertionError(vis);
462 }
463 }
464 }
465 }
466
467 int attrCount = 0;
468 if (hasVisible) {
469 int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations);
470 writeParamAnnotations(vars, RetentionPolicy.RUNTIME);
471 endAttr(attrIndex);
472 attrCount++;
473 }
474 if (hasInvisible) {
475 int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations);
476 writeParamAnnotations(vars, RetentionPolicy.CLASS);
477 endAttr(attrIndex);
478 attrCount++;
479 }
480 return attrCount;
481 }
482
483 /* ********************************************************************
484 * Writing Java-language annotations (aka metadata, attributes)
485 **********************************************************************/
486
487 /** Write Java-language annotations; return number of JVM
488 * attributes written (zero or one).
489 */
490 int writeJavaAnnotations(List<Attribute.Compound> attrs) {
491 if (attrs.isEmpty()) return 0;
492 ListBuffer<Attribute.Compound> visibles = new ListBuffer<>();
493 ListBuffer<Attribute.Compound> invisibles = new ListBuffer<>();
494 for (Attribute.Compound a : attrs) {
495 switch (types.getRetention(a)) {
496 case SOURCE: break;
497 case CLASS: invisibles.append(a); break;
498 case RUNTIME: visibles.append(a); break;
499 default: // /* fail soft */ throw new AssertionError(vis);
500 }
501 }
502
503 int attrCount = 0;
504 if (visibles.length() != 0) {
505 int attrIndex = writeAttr(names.RuntimeVisibleAnnotations);
506 databuf.appendChar(visibles.length());
507 for (Attribute.Compound a : visibles)
508 writeCompoundAttribute(a);
509 endAttr(attrIndex);
510 attrCount++;
511 }
512 if (invisibles.length() != 0) {
513 int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations);
514 databuf.appendChar(invisibles.length());
515 for (Attribute.Compound a : invisibles)
516 writeCompoundAttribute(a);
517 endAttr(attrIndex);
518 attrCount++;
519 }
520 return attrCount;
521 }
522
523 int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos, boolean inCode) {
524 if (typeAnnos.isEmpty()) return 0;
525
526 ListBuffer<Attribute.TypeCompound> visibles = new ListBuffer<>();
527 ListBuffer<Attribute.TypeCompound> invisibles = new ListBuffer<>();
528
529 for (Attribute.TypeCompound tc : typeAnnos) {
530 if (tc.hasUnknownPosition()) {
531 boolean fixed = tc.tryFixPosition();
532
533 // Could we fix it?
534 if (!fixed) {
535 // This happens for nested types like @A Outer. @B Inner.
536 // For method parameters we get the annotation twice! Once with
537 // a valid position, once unknown.
538 // TODO: find a cleaner solution.
539 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
540 pw.println("ClassWriter: Position UNKNOWN in type annotation: " + tc);
541 continue;
542 }
543 }
544
545 if (tc.position.type.isLocal() != inCode)
546 continue;
547 if (!tc.position.emitToClassfile())
548 continue;
549 switch (types.getRetention(tc)) {
550 case SOURCE: break;
551 case CLASS: invisibles.append(tc); break;
552 case RUNTIME: visibles.append(tc); break;
553 default: // /* fail soft */ throw new AssertionError(vis);
554 }
555 }
556
557 int attrCount = 0;
558 if (visibles.length() != 0) {
559 int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations);
560 databuf.appendChar(visibles.length());
561 for (Attribute.TypeCompound p : visibles)
562 writeTypeAnnotation(p);
563 endAttr(attrIndex);
564 attrCount++;
565 }
566
567 if (invisibles.length() != 0) {
568 int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations);
569 databuf.appendChar(invisibles.length());
570 for (Attribute.TypeCompound p : invisibles)
571 writeTypeAnnotation(p);
572 endAttr(attrIndex);
573 attrCount++;
574 }
575
576 return attrCount;
577 }
578
579 /** A visitor to write an attribute including its leading
580 * single-character marker.
581 */
582 class AttributeWriter implements Attribute.Visitor {
583 public void visitConstant(Attribute.Constant _value) {
584 if (_value.type.getTag() == CLASS) {
585 Assert.check(_value.value instanceof String);
586 String s = (String)_value.value;
587 databuf.appendByte('s');
588 databuf.appendChar(poolWriter.putName(names.fromString(s)));
589 } else {
590 switch (_value.type.getTag()) {
591 case BYTE:
592 databuf.appendByte('B');
593 break;
594 case CHAR:
595 databuf.appendByte('C');
596 break;
597 case SHORT:
598 databuf.appendByte('S');
599 break;
600 case INT:
601 databuf.appendByte('I');
602 break;
603 case LONG:
604 databuf.appendByte('J');
605 break;
606 case FLOAT:
607 databuf.appendByte('F');
608 break;
609 case DOUBLE:
610 databuf.appendByte('D');
611 break;
612 case BOOLEAN:
613 databuf.appendByte('Z');
614 break;
615 default:
616 throw new AssertionError(_value.type);
617 }
618 databuf.appendChar(poolWriter.putConstant(_value.value));
619 }
620 }
621 public void visitEnum(Attribute.Enum e) {
622 databuf.appendByte('e');
623 databuf.appendChar(poolWriter.putDescriptor(e.value.type));
624 databuf.appendChar(poolWriter.putName(e.value.name));
625 }
626 public void visitClass(Attribute.Class clazz) {
627 databuf.appendByte('c');
628 databuf.appendChar(poolWriter.putDescriptor(clazz.classType));
629 }
630 public void visitCompound(Attribute.Compound compound) {
631 databuf.appendByte('@');
632 writeCompoundAttribute(compound);
633 }
634 public void visitError(Attribute.Error x) {
635 throw new AssertionError(x);
636 }
637 public void visitArray(Attribute.Array array) {
638 databuf.appendByte('[');
639 databuf.appendChar(array.values.length);
640 for (Attribute a : array.values) {
641 a.accept(this);
642 }
643 }
644 }
645 AttributeWriter awriter = new AttributeWriter();
646
647 /** Write a compound attribute excluding the '@' marker. */
648 void writeCompoundAttribute(Attribute.Compound c) {
649 databuf.appendChar(poolWriter.putDescriptor(c.type));
650 databuf.appendChar(c.values.length());
651 for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) {
652 databuf.appendChar(poolWriter.putName(p.fst.name));
653 p.snd.accept(awriter);
654 }
655 }
656
657 void writeTypeAnnotation(Attribute.TypeCompound c) {
658 writePosition(c.position);
659 writeCompoundAttribute(c);
660 }
661
662 void writePosition(TypeAnnotationPosition p) {
663 databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte
664 switch (p.type) {
665 // instanceof
666 case INSTANCEOF:
667 // new expression
668 case NEW:
669 // constructor/method reference receiver
670 case CONSTRUCTOR_REFERENCE:
671 case METHOD_REFERENCE:
672 databuf.appendChar(p.offset);
673 break;
674 // local variable
675 case LOCAL_VARIABLE:
676 // resource variable
677 case RESOURCE_VARIABLE:
678 databuf.appendChar(p.lvarOffset.length); // for table length
679 for (int i = 0; i < p.lvarOffset.length; ++i) {
680 databuf.appendChar(p.lvarOffset[i]);
681 databuf.appendChar(p.lvarLength[i]);
682 databuf.appendChar(p.lvarIndex[i]);
683 }
684 break;
685 // exception parameter
686 case EXCEPTION_PARAMETER:
687 databuf.appendChar(p.getExceptionIndex());
688 break;
689 // method receiver
690 case METHOD_RECEIVER:
691 // Do nothing
692 break;
693 // type parameter
694 case CLASS_TYPE_PARAMETER:
695 case METHOD_TYPE_PARAMETER:
696 databuf.appendByte(p.parameter_index);
697 break;
698 // type parameter bound
699 case CLASS_TYPE_PARAMETER_BOUND:
700 case METHOD_TYPE_PARAMETER_BOUND:
701 databuf.appendByte(p.parameter_index);
702 databuf.appendByte(p.bound_index);
703 break;
704 // class extends or implements clause
705 case CLASS_EXTENDS:
706 databuf.appendChar(p.type_index);
707 break;
708 // throws
709 case THROWS:
710 databuf.appendChar(p.type_index);
711 break;
712 // method parameter
713 case METHOD_FORMAL_PARAMETER:
714 databuf.appendByte(p.parameter_index);
715 break;
716 // type cast
717 case CAST:
718 // method/constructor/reference type argument
719 case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT:
720 case METHOD_INVOCATION_TYPE_ARGUMENT:
721 case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT:
722 case METHOD_REFERENCE_TYPE_ARGUMENT:
723 databuf.appendChar(p.offset);
724 databuf.appendByte(p.type_index);
725 break;
726 // We don't need to worry about these
727 case METHOD_RETURN:
728 case FIELD:
729 break;
730 case UNKNOWN:
731 throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!");
732 default:
733 throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p);
734 }
735
736 { // Append location data for generics/arrays.
737 databuf.appendByte(p.location.size());
738 java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location);
739 for (int i : loc)
740 databuf.appendByte((byte)i);
741 }
742 }
743
744 /* ********************************************************************
745 * Writing module attributes
746 **********************************************************************/
747
748 /** Write the Module attribute if needed.
749 * Returns the number of attributes written (0 or 1).
750 */
751 int writeModuleAttribute(ClassSymbol c) {
752 ModuleSymbol m = (ModuleSymbol) c.owner;
753
754 int alenIdx = writeAttr(names.Module);
755
756 databuf.appendChar(poolWriter.putModule(m));
757 databuf.appendChar(ModuleFlags.value(m.flags)); // module_flags
758 databuf.appendChar(m.version != null ? poolWriter.putName(m.version) : 0);
759
760 ListBuffer<RequiresDirective> requires = new ListBuffer<>();
761 for (RequiresDirective r: m.requires) {
762 if (!r.flags.contains(RequiresFlag.EXTRA))
763 requires.add(r);
764 }
765 databuf.appendChar(requires.size());
766 for (RequiresDirective r: requires) {
767 databuf.appendChar(poolWriter.putModule(r.module));
768 databuf.appendChar(RequiresFlag.value(r.flags));
769 databuf.appendChar(r.module.version != null ? poolWriter.putName(r.module.version) : 0);
770 }
771
772 List<ExportsDirective> exports = m.exports;
773 databuf.appendChar(exports.size());
774 for (ExportsDirective e: exports) {
775 databuf.appendChar(poolWriter.putPackage(e.packge));
776 databuf.appendChar(ExportsFlag.value(e.flags));
777 if (e.modules == null) {
778 databuf.appendChar(0);
779 } else {
780 databuf.appendChar(e.modules.size());
781 for (ModuleSymbol msym: e.modules) {
782 databuf.appendChar(poolWriter.putModule(msym));
783 }
784 }
785 }
786
787 List<OpensDirective> opens = m.opens;
788 databuf.appendChar(opens.size());
789 for (OpensDirective o: opens) {
790 databuf.appendChar(poolWriter.putPackage(o.packge));
791 databuf.appendChar(OpensFlag.value(o.flags));
792 if (o.modules == null) {
793 databuf.appendChar(0);
794 } else {
795 databuf.appendChar(o.modules.size());
796 for (ModuleSymbol msym: o.modules) {
797 databuf.appendChar(poolWriter.putModule(msym));
798 }
799 }
800 }
801
802 List<UsesDirective> uses = m.uses;
803 databuf.appendChar(uses.size());
804 for (UsesDirective s: uses) {
805 databuf.appendChar(poolWriter.putClass(s.service));
806 }
807
808 // temporary fix to merge repeated provides clause for same service;
809 // eventually this should be disallowed when analyzing the module,
810 // so that each service type only appears once.
811 Map<ClassSymbol, Set<ClassSymbol>> mergedProvides = new LinkedHashMap<>();
812 for (ProvidesDirective p : m.provides) {
813 mergedProvides.computeIfAbsent(p.service, s -> new LinkedHashSet<>()).addAll(p.impls);
814 }
815 databuf.appendChar(mergedProvides.size());
816 mergedProvides.forEach((srvc, impls) -> {
817 databuf.appendChar(poolWriter.putClass(srvc));
818 databuf.appendChar(impls.size());
819 impls.forEach(impl -> databuf.appendChar(poolWriter.putClass(impl)));
820 });
821
822 endAttr(alenIdx);
823 return 1;
824 }
825
826 /* ********************************************************************
827 * Writing Objects
828 **********************************************************************/
829
830 /** Write "inner classes" attribute.
831 */
832 void writeInnerClasses() {
833 int alenIdx = writeAttr(names.InnerClasses);
834 databuf.appendChar(poolWriter.innerClasses.size());
835 for (ClassSymbol inner : poolWriter.innerClasses) {
836 inner.markAbstractIfNeeded(types);
837 int flags = adjustFlags(inner.flags_field);
838 if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT
839 flags &= ~STRICTFP; //inner classes should not have the strictfp flag set.
840 if (dumpInnerClassModifiers) {
841 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
842 pw.println("INNERCLASS " + inner.name);
843 pw.println("---" + flagNames(flags));
844 }
845 databuf.appendChar(poolWriter.putClass(inner));
846 databuf.appendChar(
847 inner.owner.kind == TYP && !inner.name.isEmpty() ? poolWriter.putClass((ClassSymbol)inner.owner) : 0);
848 databuf.appendChar(
849 !inner.name.isEmpty() ? poolWriter.putName(inner.name) : 0);
850 databuf.appendChar(flags);
851 }
852 endAttr(alenIdx);
853 }
854
855 int writeRecordAttribute(ClassSymbol csym) {
856 int alenIdx = writeAttr(names.Record);
857 Scope s = csym.members();
858 databuf.appendChar(csym.getRecordComponents().size());
859 for (VarSymbol v: csym.getRecordComponents()) {
860 //databuf.appendChar(poolWriter.putMember(v.accessor.head.snd));
861 databuf.appendChar(poolWriter.putName(v.name));
862 databuf.appendChar(poolWriter.putDescriptor(v));
863 int acountIdx = beginAttrs();
864 int acount = 0;
865 acount += writeMemberAttrs(v, true);
866 endAttrs(acountIdx, acount);
867 }
868 endAttr(alenIdx);
869 return 1;
870 }
871
872 /**
873 * Write NestMembers attribute (if needed)
874 */
875 int writeNestMembersIfNeeded(ClassSymbol csym) {
876 ListBuffer<ClassSymbol> nested = new ListBuffer<>();
877 listNested(csym, nested);
878 Set<ClassSymbol> nestedUnique = new LinkedHashSet<>(nested);
879 if (csym.owner.kind == PCK && !nestedUnique.isEmpty()) {
880 int alenIdx = writeAttr(names.NestMembers);
881 databuf.appendChar(nestedUnique.size());
882 for (ClassSymbol s : nestedUnique) {
883 databuf.appendChar(poolWriter.putClass(s));
884 }
885 endAttr(alenIdx);
886 return 1;
887 }
888 return 0;
889 }
890
891 /**
892 * Write NestHost attribute (if needed)
893 */
894 int writeNestHostIfNeeded(ClassSymbol csym) {
895 if (csym.owner.kind != PCK) {
896 int alenIdx = writeAttr(names.NestHost);
897 databuf.appendChar(poolWriter.putClass(csym.outermostClass()));
898 endAttr(alenIdx);
899 return 1;
900 }
901 return 0;
902 }
903
904 private void listNested(Symbol sym, ListBuffer<ClassSymbol> seen) {
905 if (sym.kind != TYP) return;
906 ClassSymbol csym = (ClassSymbol)sym;
907 if (csym.owner.kind != PCK) {
908 seen.add(csym);
909 }
910 if (csym.members() != null) {
911 for (Symbol s : sym.members().getSymbols()) {
912 listNested(s, seen);
913 }
914 }
915 if (csym.trans_local != null) {
916 for (Symbol s : csym.trans_local) {
917 listNested(s, seen);
918 }
919 }
920 }
921
922 /** Write "PermittedSubclasses" attribute.
923 */
924 int writePermittedSubclassesIfNeeded(ClassSymbol csym) {
925 if (csym.getPermittedSubclasses().nonEmpty()) {
926 int alenIdx = writeAttr(names.PermittedSubclasses);
927 databuf.appendChar(csym.getPermittedSubclasses().size());
928 for (Type t : csym.getPermittedSubclasses()) {
929 databuf.appendChar(poolWriter.putClass((ClassSymbol) t.tsym));
930 }
931 endAttr(alenIdx);
932 return 1;
933 }
934 return 0;
935 }
936
937 /** Write "bootstrapMethods" attribute.
938 */
939 void writeBootstrapMethods() {
940 int alenIdx = writeAttr(names.BootstrapMethods);
941 int lastBootstrapMethods;
942 do {
943 lastBootstrapMethods = poolWriter.bootstrapMethods.size();
944 for (BsmKey bsmKey : java.util.List.copyOf(poolWriter.bootstrapMethods.keySet())) {
945 for (LoadableConstant arg : bsmKey.staticArgs) {
946 poolWriter.putConstant(arg);
947 }
948 }
949 } while (lastBootstrapMethods < poolWriter.bootstrapMethods.size());
950 databuf.appendChar(poolWriter.bootstrapMethods.size());
951 for (BsmKey bsmKey : poolWriter.bootstrapMethods.keySet()) {
952 //write BSM handle
953 databuf.appendChar(poolWriter.putConstant(bsmKey.bsm));
954 LoadableConstant[] uniqueArgs = bsmKey.staticArgs;
955 //write static args length
956 databuf.appendChar(uniqueArgs.length);
957 //write static args array
958 for (LoadableConstant arg : uniqueArgs) {
959 databuf.appendChar(poolWriter.putConstant(arg));
960 }
961 }
962 endAttr(alenIdx);
963 }
964
965 /** Write field symbol, entering all references into constant pool.
966 */
967 void writeField(VarSymbol v) {
968 int flags = adjustFlags(v.flags());
969 databuf.appendChar(flags);
970 if (dumpFieldModifiers) {
971 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
972 pw.println("FIELD " + v.name);
973 pw.println("---" + flagNames(v.flags()));
974 }
975 databuf.appendChar(poolWriter.putName(v.name));
976 databuf.appendChar(poolWriter.putDescriptor(v));
977 int acountIdx = beginAttrs();
978 int acount = 0;
979 if (v.getConstValue() != null) {
980 int alenIdx = writeAttr(names.ConstantValue);
981 databuf.appendChar(poolWriter.putConstant(v.getConstValue()));
982 endAttr(alenIdx);
983 acount++;
984 }
985 acount += writeMemberAttrs(v, false);
986 acount += writeExtraAttributes(v);
987 endAttrs(acountIdx, acount);
988 }
989
990 /** Write method symbol, entering all references into constant pool.
991 */
992 void writeMethod(MethodSymbol m) {
993 int flags = adjustFlags(m.flags());
994 databuf.appendChar(flags);
995 if (dumpMethodModifiers) {
996 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
997 pw.println("METHOD " + m.name);
998 pw.println("---" + flagNames(m.flags()));
999 }
1000 databuf.appendChar(poolWriter.putName(m.name));
1001 databuf.appendChar(poolWriter.putDescriptor(m));
1002 int acountIdx = beginAttrs();
1003 int acount = 0;
1004 if (m.code != null) {
1005 int alenIdx = writeAttr(names.Code);
1006 writeCode(m.code);
1007 m.code = null; // to conserve space
1008 endAttr(alenIdx);
1009 acount++;
1010 }
1011 List<Type> thrown = m.erasure(types).getThrownTypes();
1012 if (thrown.nonEmpty()) {
1013 int alenIdx = writeAttr(names.Exceptions);
1014 databuf.appendChar(thrown.length());
1015 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1016 databuf.appendChar(poolWriter.putClass(l.head));
1017 endAttr(alenIdx);
1018 acount++;
1019 }
1020 if (m.defaultValue != null) {
1021 int alenIdx = writeAttr(names.AnnotationDefault);
1022 m.defaultValue.accept(awriter);
1023 endAttr(alenIdx);
1024 acount++;
1025 }
1026 if (target.hasMethodParameters()) {
1027 if (!m.isLambdaMethod()) { // Per JDK-8138729, do not emit parameters table for lambda bodies.
1028 boolean requiresParamNames = requiresParamNames(m);
1029 if (requiresParamNames || requiresParamFlags(m))
1030 acount += writeMethodParametersAttr(m, requiresParamNames);
1031 }
1032 }
1033 acount += writeMemberAttrs(m, false);
1034 if (!m.isLambdaMethod())
1035 acount += writeParameterAttrs(m.params);
1036 acount += writeExtraAttributes(m);
1037 endAttrs(acountIdx, acount);
1038 }
1039
1040 private boolean requiresParamNames(MethodSymbol m) {
1041 if (options.isSet(PARAMETERS))
1042 return true;
1043 if (m.isConstructor() && (m.flags_field & RECORD) != 0)
1044 return true;
1045 return false;
1046 }
1047
1048 private boolean requiresParamFlags(MethodSymbol m) {
1049 if (!m.extraParams.isEmpty()) {
1050 return m.extraParams.stream().anyMatch(p -> (p.flags_field & (SYNTHETIC | MANDATED)) != 0);
1051 }
1052 if (m.params != null) {
1053 // parameter is stored in params for Enum#valueOf(name)
1054 return m.params.stream().anyMatch(p -> (p.flags_field & (SYNTHETIC | MANDATED)) != 0);
1055 }
1056 return false;
1057 }
1058
1059 /** Write code attribute of method.
1060 */
1061 void writeCode(Code code) {
1062 databuf.appendChar(code.max_stack);
1063 databuf.appendChar(code.max_locals);
1064 databuf.appendInt(code.cp);
1065 databuf.appendBytes(code.code, 0, code.cp);
1066 databuf.appendChar(code.catchInfo.length());
1067 for (List<char[]> l = code.catchInfo.toList();
1068 l.nonEmpty();
1069 l = l.tail) {
1070 for (int i = 0; i < l.head.length; i++)
1071 databuf.appendChar(l.head[i]);
1072 }
1073 int acountIdx = beginAttrs();
1074 int acount = 0;
1075
1076 if (code.lineInfo.nonEmpty()) {
1077 int alenIdx = writeAttr(names.LineNumberTable);
1078 databuf.appendChar(code.lineInfo.length());
1079 for (List<char[]> l = code.lineInfo.reverse();
1080 l.nonEmpty();
1081 l = l.tail)
1082 for (int i = 0; i < l.head.length; i++)
1083 databuf.appendChar(l.head[i]);
1084 endAttr(alenIdx);
1085 acount++;
1086 }
1087
1088 if (genCrt && (code.crt != null)) {
1089 CRTable crt = code.crt;
1090 int alenIdx = writeAttr(names.CharacterRangeTable);
1091 int crtIdx = beginAttrs();
1092 int crtEntries = crt.writeCRT(databuf, code.lineMap, log);
1093 endAttrs(crtIdx, crtEntries);
1094 endAttr(alenIdx);
1095 acount++;
1096 }
1097
1098 // counter for number of generic local variables
1099 if (code.varDebugInfo && code.varBufferSize > 0) {
1100 int nGenericVars = 0;
1101 int alenIdx = writeAttr(names.LocalVariableTable);
1102 databuf.appendChar(code.getLVTSize());
1103 for (int i=0; i<code.varBufferSize; i++) {
1104 Code.LocalVar var = code.varBuffer[i];
1105
1106 for (Code.LocalVar.Range r: var.aliveRanges) {
1107 // write variable info
1108 Assert.check(r.start_pc >= 0
1109 && r.start_pc <= code.cp);
1110 databuf.appendChar(r.start_pc);
1111 Assert.check(r.length > 0
1112 && (r.start_pc + r.length) <= code.cp);
1113 databuf.appendChar(r.length);
1114 VarSymbol sym = var.sym;
1115 databuf.appendChar(poolWriter.putName(sym.name));
1116 databuf.appendChar(poolWriter.putDescriptor(sym));
1117 databuf.appendChar(var.reg);
1118 if (needsLocalVariableTypeEntry(var.sym.type)) {
1119 nGenericVars++;
1120 }
1121 }
1122 }
1123 endAttr(alenIdx);
1124 acount++;
1125
1126 if (nGenericVars > 0) {
1127 alenIdx = writeAttr(names.LocalVariableTypeTable);
1128 databuf.appendChar(nGenericVars);
1129 int count = 0;
1130
1131 for (int i=0; i<code.varBufferSize; i++) {
1132 Code.LocalVar var = code.varBuffer[i];
1133 VarSymbol sym = var.sym;
1134 if (!needsLocalVariableTypeEntry(sym.type))
1135 continue;
1136 for (Code.LocalVar.Range r : var.aliveRanges) {
1137 // write variable info
1138 databuf.appendChar(r.start_pc);
1139 databuf.appendChar(r.length);
1140 databuf.appendChar(poolWriter.putName(sym.name));
1141 databuf.appendChar(poolWriter.putSignature(sym));
1142 databuf.appendChar(var.reg);
1143 count++;
1144 }
1145 }
1146 Assert.check(count == nGenericVars);
1147 endAttr(alenIdx);
1148 acount++;
1149 }
1150 }
1151
1152 if (code.stackMapBufferSize > 0) {
1153 if (debugstackmap) System.out.println("Stack map for " + code.meth);
1154 int alenIdx = writeAttr(code.stackMap.getAttributeName(names));
1155 writeStackMap(code);
1156 endAttr(alenIdx);
1157 acount++;
1158 }
1159
1160 acount += writeTypeAnnotations(code.meth.getRawTypeAttributes(), true);
1161
1162 endAttrs(acountIdx, acount);
1163 }
1164 //where
1165 private boolean needsLocalVariableTypeEntry(Type t) {
1166 //a local variable needs a type-entry if its type T is generic
1167 //(i.e. |T| != T) and if it's not an non-denotable type (non-denotable
1168 // types are not supported in signature attribute grammar!)
1169 return !types.isSameType(t, types.erasure(t)) &&
1170 check.checkDenotable(t);
1171 }
1172
1173 void writeStackMap(Code code) {
1174 int nframes = code.stackMapBufferSize;
1175 if (debugstackmap) System.out.println(" nframes = " + nframes);
1176 databuf.appendChar(nframes);
1177
1178 switch (code.stackMap) {
1179 case CLDC:
1180 for (int i=0; i<nframes; i++) {
1181 if (debugstackmap) System.out.print(" " + i + ":");
1182 Code.StackMapFrame frame = code.stackMapBuffer[i];
1183
1184 // output PC
1185 if (debugstackmap) System.out.print(" pc=" + frame.pc);
1186 databuf.appendChar(frame.pc);
1187
1188 // output locals
1189 int localCount = 0;
1190 for (int j=0; j<frame.locals.length;
1191 j += Code.width(frame.locals[j])) {
1192 localCount++;
1193 }
1194 if (debugstackmap) System.out.print(" nlocals=" +
1195 localCount);
1196 databuf.appendChar(localCount);
1197 for (int j=0; j<frame.locals.length;
1198 j += Code.width(frame.locals[j])) {
1199 if (debugstackmap) System.out.print(" local[" + j + "]=");
1200 writeStackMapType(frame.locals[j]);
1201 }
1202
1203 // output stack
1204 int stackCount = 0;
1205 for (int j=0; j<frame.stack.length;
1206 j += Code.width(frame.stack[j])) {
1207 stackCount++;
1208 }
1209 if (debugstackmap) System.out.print(" nstack=" +
1210 stackCount);
1211 databuf.appendChar(stackCount);
1212 for (int j=0; j<frame.stack.length;
1213 j += Code.width(frame.stack[j])) {
1214 if (debugstackmap) System.out.print(" stack[" + j + "]=");
1215 writeStackMapType(frame.stack[j]);
1216 }
1217 if (debugstackmap) System.out.println();
1218 }
1219 break;
1220 case JSR202: {
1221 Assert.checkNull(code.stackMapBuffer);
1222 for (int i=0; i<nframes; i++) {
1223 if (debugstackmap) System.out.print(" " + i + ":");
1224 StackMapTableFrame frame = code.stackMapTableBuffer[i];
1225 frame.write(this);
1226 if (debugstackmap) System.out.println();
1227 }
1228 break;
1229 }
1230 default:
1231 throw new AssertionError("Unexpected stackmap format value");
1232 }
1233 }
1234
1235 //where
1236 void writeStackMapType(Type t) {
1237 if (t == null) {
1238 if (debugstackmap) System.out.print("empty");
1239 databuf.appendByte(0);
1240 }
1241 else switch(t.getTag()) {
1242 case BYTE:
1243 case CHAR:
1244 case SHORT:
1245 case INT:
1246 case BOOLEAN:
1247 if (debugstackmap) System.out.print("int");
1248 databuf.appendByte(1);
1249 break;
1250 case FLOAT:
1251 if (debugstackmap) System.out.print("float");
1252 databuf.appendByte(2);
1253 break;
1254 case DOUBLE:
1255 if (debugstackmap) System.out.print("double");
1256 databuf.appendByte(3);
1257 break;
1258 case LONG:
1259 if (debugstackmap) System.out.print("long");
1260 databuf.appendByte(4);
1261 break;
1262 case BOT: // null
1263 if (debugstackmap) System.out.print("null");
1264 databuf.appendByte(5);
1265 break;
1266 case CLASS:
1267 case ARRAY:
1268 case TYPEVAR:
1269 if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")");
1270 databuf.appendByte(7);
1271 databuf.appendChar(poolWriter.putClass(types.erasure(t)));
1272 break;
1273 case UNINITIALIZED_THIS:
1274 if (debugstackmap) System.out.print("uninit_this");
1275 databuf.appendByte(6);
1276 break;
1277 case UNINITIALIZED_OBJECT:
1278 { UninitializedType uninitType = (UninitializedType)t;
1279 databuf.appendByte(8);
1280 if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset);
1281 databuf.appendChar(uninitType.offset);
1282 }
1283 break;
1284 default:
1285 throw new AssertionError();
1286 }
1287 }
1288
1289 /** An entry in the JSR202 StackMapTable */
1290 abstract static class StackMapTableFrame {
1291 abstract int getFrameType();
1292
1293 void write(ClassWriter writer) {
1294 int frameType = getFrameType();
1295 writer.databuf.appendByte(frameType);
1296 if (writer.debugstackmap) System.out.print(" frame_type=" + frameType);
1297 }
1298
1299 static class SameFrame extends StackMapTableFrame {
1300 final int offsetDelta;
1301 SameFrame(int offsetDelta) {
1302 this.offsetDelta = offsetDelta;
1303 }
1304 int getFrameType() {
1305 return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED;
1306 }
1307 @Override
1308 void write(ClassWriter writer) {
1309 super.write(writer);
1310 if (getFrameType() == SAME_FRAME_EXTENDED) {
1311 writer.databuf.appendChar(offsetDelta);
1312 if (writer.debugstackmap){
1313 System.out.print(" offset_delta=" + offsetDelta);
1314 }
1315 }
1316 }
1317 }
1318
1319 static class SameLocals1StackItemFrame extends StackMapTableFrame {
1320 final int offsetDelta;
1321 final Type stack;
1322 SameLocals1StackItemFrame(int offsetDelta, Type stack) {
1323 this.offsetDelta = offsetDelta;
1324 this.stack = stack;
1325 }
1326 int getFrameType() {
1327 return (offsetDelta < SAME_FRAME_SIZE) ?
1328 (SAME_FRAME_SIZE + offsetDelta) :
1329 SAME_LOCALS_1_STACK_ITEM_EXTENDED;
1330 }
1331 @Override
1332 void write(ClassWriter writer) {
1333 super.write(writer);
1334 if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
1335 writer.databuf.appendChar(offsetDelta);
1336 if (writer.debugstackmap) {
1337 System.out.print(" offset_delta=" + offsetDelta);
1338 }
1339 }
1340 if (writer.debugstackmap) {
1341 System.out.print(" stack[" + 0 + "]=");
1342 }
1343 writer.writeStackMapType(stack);
1344 }
1345 }
1346
1347 static class ChopFrame extends StackMapTableFrame {
1348 final int frameType;
1349 final int offsetDelta;
1350 ChopFrame(int frameType, int offsetDelta) {
1351 this.frameType = frameType;
1352 this.offsetDelta = offsetDelta;
1353 }
1354 int getFrameType() { return frameType; }
1355 @Override
1356 void write(ClassWriter writer) {
1357 super.write(writer);
1358 writer.databuf.appendChar(offsetDelta);
1359 if (writer.debugstackmap) {
1360 System.out.print(" offset_delta=" + offsetDelta);
1361 }
1362 }
1363 }
1364
1365 static class AppendFrame extends StackMapTableFrame {
1366 final int frameType;
1367 final int offsetDelta;
1368 final Type[] locals;
1369 AppendFrame(int frameType, int offsetDelta, Type[] locals) {
1370 this.frameType = frameType;
1371 this.offsetDelta = offsetDelta;
1372 this.locals = locals;
1373 }
1374 int getFrameType() { return frameType; }
1375 @Override
1376 void write(ClassWriter writer) {
1377 super.write(writer);
1378 writer.databuf.appendChar(offsetDelta);
1379 if (writer.debugstackmap) {
1380 System.out.print(" offset_delta=" + offsetDelta);
1381 }
1382 for (int i=0; i<locals.length; i++) {
1383 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1384 writer.writeStackMapType(locals[i]);
1385 }
1386 }
1387 }
1388
1389 static class FullFrame extends StackMapTableFrame {
1390 final int offsetDelta;
1391 final Type[] locals;
1392 final Type[] stack;
1393 FullFrame(int offsetDelta, Type[] locals, Type[] stack) {
1394 this.offsetDelta = offsetDelta;
1395 this.locals = locals;
1396 this.stack = stack;
1397 }
1398 int getFrameType() { return FULL_FRAME; }
1399 @Override
1400 void write(ClassWriter writer) {
1401 super.write(writer);
1402 writer.databuf.appendChar(offsetDelta);
1403 writer.databuf.appendChar(locals.length);
1404 if (writer.debugstackmap) {
1405 System.out.print(" offset_delta=" + offsetDelta);
1406 System.out.print(" nlocals=" + locals.length);
1407 }
1408 for (int i=0; i<locals.length; i++) {
1409 if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
1410 writer.writeStackMapType(locals[i]);
1411 }
1412
1413 writer.databuf.appendChar(stack.length);
1414 if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); }
1415 for (int i=0; i<stack.length; i++) {
1416 if (writer.debugstackmap) System.out.print(" stack[" + i + "]=");
1417 writer.writeStackMapType(stack[i]);
1418 }
1419 }
1420 }
1421
1422 /** Compare this frame with the previous frame and produce
1423 * an entry of compressed stack map frame. */
1424 static StackMapTableFrame getInstance(Code.StackMapFrame this_frame,
1425 int prev_pc,
1426 Type[] prev_locals,
1427 Types types) {
1428 Type[] locals = this_frame.locals;
1429 Type[] stack = this_frame.stack;
1430 int offset_delta = this_frame.pc - prev_pc - 1;
1431 if (stack.length == 1) {
1432 if (locals.length == prev_locals.length
1433 && compare(prev_locals, locals, types) == 0) {
1434 return new SameLocals1StackItemFrame(offset_delta, stack[0]);
1435 }
1436 } else if (stack.length == 0) {
1437 int diff_length = compare(prev_locals, locals, types);
1438 if (diff_length == 0) {
1439 return new SameFrame(offset_delta);
1440 } else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) {
1441 // APPEND
1442 Type[] local_diff = new Type[-diff_length];
1443 for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) {
1444 local_diff[j] = locals[i];
1445 }
1446 return new AppendFrame(SAME_FRAME_EXTENDED - diff_length,
1447 offset_delta,
1448 local_diff);
1449 } else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) {
1450 // CHOP
1451 return new ChopFrame(SAME_FRAME_EXTENDED - diff_length,
1452 offset_delta);
1453 }
1454 }
1455 // FULL_FRAME
1456 return new FullFrame(offset_delta, locals, stack);
1457 }
1458
1459 static boolean isInt(Type t) {
1460 return (t.getTag().isStrictSubRangeOf(INT) || t.hasTag(BOOLEAN));
1461 }
1462
1463 static boolean isSameType(Type t1, Type t2, Types types) {
1464 if (t1 == null) { return t2 == null; }
1465 if (t2 == null) { return false; }
1466
1467 if (isInt(t1) && isInt(t2)) { return true; }
1468
1469 if (t1.hasTag(UNINITIALIZED_THIS)) {
1470 return t2.hasTag(UNINITIALIZED_THIS);
1471 } else if (t1.hasTag(UNINITIALIZED_OBJECT)) {
1472 if (t2.hasTag(UNINITIALIZED_OBJECT)) {
1473 return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset;
1474 } else {
1475 return false;
1476 }
1477 } else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) {
1478 return false;
1479 }
1480
1481 return types.isSameType(t1, t2);
1482 }
1483
1484 static int compare(Type[] arr1, Type[] arr2, Types types) {
1485 int diff_length = arr1.length - arr2.length;
1486 if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) {
1487 return Integer.MAX_VALUE;
1488 }
1489 int len = (diff_length > 0) ? arr2.length : arr1.length;
1490 for (int i=0; i<len; i++) {
1491 if (!isSameType(arr1[i], arr2[i], types)) {
1492 return Integer.MAX_VALUE;
1493 }
1494 }
1495 return diff_length;
1496 }
1497 }
1498
1499 void writeFields(Scope s) {
1500 // process them in reverse sibling order;
1501 // i.e., process them in declaration order.
1502 List<VarSymbol> vars = List.nil();
1503 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) {
1504 if (sym.kind == VAR) vars = vars.prepend((VarSymbol)sym);
1505 }
1506 while (vars.nonEmpty()) {
1507 writeField(vars.head);
1508 vars = vars.tail;
1509 }
1510 }
1511
1512 void writeMethods(Scope s) {
1513 List<MethodSymbol> methods = List.nil();
1514 for (Symbol sym : s.getSymbols(NON_RECURSIVE)) {
1515 if (sym.kind == MTH && (sym.flags() & HYPOTHETICAL) == 0)
1516 methods = methods.prepend((MethodSymbol)sym);
1517 }
1518 while (methods.nonEmpty()) {
1519 writeMethod(methods.head);
1520 methods = methods.tail;
1521 }
1522 }
1523
1524 /** Emit a class file for a given class.
1525 * @param c The class from which a class file is generated.
1526 */
1527 public JavaFileObject writeClass(ClassSymbol c)
1528 throws IOException, PoolOverflow, StringOverflow
1529 {
1530 String name = (c.owner.kind == MDL ? c.name : c.flatname).toString();
1531 Location outLocn;
1532 if (multiModuleMode) {
1533 ModuleSymbol msym = c.owner.kind == MDL ? (ModuleSymbol) c.owner : c.packge().modle;
1534 outLocn = fileManager.getLocationForModule(CLASS_OUTPUT, msym.name.toString());
1535 } else {
1536 outLocn = CLASS_OUTPUT;
1537 }
1538 JavaFileObject outFile
1539 = fileManager.getJavaFileForOutput(outLocn,
1540 name,
1541 JavaFileObject.Kind.CLASS,
1542 c.sourcefile);
1543 OutputStream out = outFile.openOutputStream();
1544 try {
1545 writeClassFile(out, c);
1546 if (verbose)
1547 log.printVerbose("wrote.file", outFile.getName());
1548 out.close();
1549 out = null;
1550 } catch (InvalidSignatureException ex) {
1551 log.error(Errors.CannotGenerateClass(c, Fragments.IllegalSignature(c, ex.type())));
1552 } finally {
1553 if (out != null) {
1554 // if we are propagating an exception, delete the file
1555 out.close();
1556 outFile.delete();
1557 outFile = null;
1558 }
1559 }
1560 return outFile; // may be null if write failed
1561 }
1562
1563 /** Write class `c' to outstream `out'.
1564 */
1565 public void writeClassFile(OutputStream out, ClassSymbol c)
1566 throws IOException, PoolOverflow, StringOverflow {
1567 Assert.check((c.flags() & COMPOUND) == 0);
1568 databuf.reset();
1569 poolbuf.reset();
1570
1571 Type supertype = types.supertype(c.type);
1572 List<Type> interfaces = types.interfaces(c.type);
1573 List<Type> typarams = c.type.getTypeArguments();
1574
1575 int flags;
1576 if (c.owner.kind == MDL) {
1577 flags = ACC_MODULE;
1578 } else {
1579 flags = adjustFlags(c.flags() & ~DEFAULT);
1580 if ((flags & PROTECTED) != 0) flags |= PUBLIC;
1581 flags = flags & ClassFlags & ~STRICTFP;
1582 if ((flags & INTERFACE) == 0) flags |= ACC_SUPER;
1583 }
1584
1585 if (dumpClassModifiers) {
1586 PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
1587 pw.println();
1588 pw.println("CLASSFILE " + c.getQualifiedName());
1589 pw.println("---" + flagNames(flags));
1590 }
1591 databuf.appendChar(flags);
1592
1593 if (c.owner.kind == MDL) {
1594 PackageSymbol unnamed = ((ModuleSymbol) c.owner).unnamedPackage;
1595 databuf.appendChar(poolWriter.putClass(new ClassSymbol(0, names.module_info, unnamed)));
1596 } else {
1597 databuf.appendChar(poolWriter.putClass(c));
1598 }
1599 databuf.appendChar(supertype.hasTag(CLASS) ? poolWriter.putClass((ClassSymbol)supertype.tsym) : 0);
1600 databuf.appendChar(interfaces.length());
1601 for (List<Type> l = interfaces; l.nonEmpty(); l = l.tail)
1602 databuf.appendChar(poolWriter.putClass((ClassSymbol)l.head.tsym));
1603 int fieldsCount = 0;
1604 int methodsCount = 0;
1605 for (Symbol sym : c.members().getSymbols(NON_RECURSIVE)) {
1606 switch (sym.kind) {
1607 case VAR: fieldsCount++; break;
1608 case MTH: if ((sym.flags() & HYPOTHETICAL) == 0) methodsCount++;
1609 break;
1610 case TYP: poolWriter.enterInner((ClassSymbol)sym); break;
1611 default : Assert.error();
1612 }
1613 }
1614
1615 if (c.trans_local != null) {
1616 for (ClassSymbol local : c.trans_local) {
1617 poolWriter.enterInner(local);
1618 }
1619 }
1620
1621 databuf.appendChar(fieldsCount);
1622 writeFields(c.members());
1623 databuf.appendChar(methodsCount);
1624 writeMethods(c.members());
1625
1626 int acountIdx = beginAttrs();
1627 int acount = 0;
1628
1629 boolean sigReq =
1630 typarams.length() != 0 || supertype.allparams().length() != 0;
1631 for (List<Type> l = interfaces; !sigReq && l.nonEmpty(); l = l.tail)
1632 sigReq = l.head.allparams().length() != 0;
1633 if (sigReq) {
1634 int alenIdx = writeAttr(names.Signature);
1635 databuf.appendChar(poolWriter.putSignature(c));
1636 endAttr(alenIdx);
1637 acount++;
1638 }
1639
1640 if (c.sourcefile != null && emitSourceFile) {
1641 int alenIdx = writeAttr(names.SourceFile);
1642 // WHM 6/29/1999: Strip file path prefix. We do it here at
1643 // the last possible moment because the sourcefile may be used
1644 // elsewhere in error diagnostics. Fixes 4241573.
1645 String simpleName = PathFileObject.getSimpleName(c.sourcefile);
1646 databuf.appendChar(poolWriter.putName(names.fromString(simpleName)));
1647 endAttr(alenIdx);
1648 acount++;
1649 }
1650
1651 if (genCrt) {
1652 // Append SourceID attribute
1653 int alenIdx = writeAttr(names.SourceID);
1654 databuf.appendChar(poolWriter.putName(names.fromString(Long.toString(getLastModified(c.sourcefile)))));
1655 endAttr(alenIdx);
1656 acount++;
1657 // Append CompilationID attribute
1658 alenIdx = writeAttr(names.CompilationID);
1659 databuf.appendChar(poolWriter.putName(names.fromString(Long.toString(System.currentTimeMillis()))));
1660 endAttr(alenIdx);
1661 acount++;
1662 }
1663
1664 acount += writeFlagAttrs(c.flags());
1665 acount += writeJavaAnnotations(c.getRawAttributes());
1666 acount += writeTypeAnnotations(c.getRawTypeAttributes(), false);
1667 acount += writeEnclosingMethodAttribute(c);
1668 if (c.owner.kind == MDL) {
1669 acount += writeModuleAttribute(c);
1670 acount += writeFlagAttrs(c.owner.flags() & ~DEPRECATED);
1671 }
1672 acount += writeExtraClassAttributes(c);
1673 acount += writeExtraAttributes(c);
1674
1675 poolbuf.appendInt(JAVA_MAGIC);
1676 if (preview.isEnabled() && preview.usesPreview(c.sourcefile)) {
1677 poolbuf.appendChar(ClassFile.PREVIEW_MINOR_VERSION);
1678 } else {
1679 poolbuf.appendChar(target.minorVersion);
1680 }
1681 poolbuf.appendChar(target.majorVersion);
1682
1683 if (c.owner.kind != MDL) {
1684 if (target.hasNestmateAccess()) {
1685 acount += writeNestMembersIfNeeded(c);
1686 acount += writeNestHostIfNeeded(c);
1687 }
1688 }
1689
1690 if (c.isRecord()) {
1691 acount += writeRecordAttribute(c);
1692 }
1693
1694 if (target.hasSealedClasses()) {
1695 acount += writePermittedSubclassesIfNeeded(c);
1696 }
1697
1698 if (!poolWriter.bootstrapMethods.isEmpty()) {
1699 writeBootstrapMethods();
1700 acount++;
1701 }
1702
1703 if (!poolWriter.innerClasses.isEmpty()) {
1704 writeInnerClasses();
1705 acount++;
1706 }
1707
1708 endAttrs(acountIdx, acount);
1709
1710 out.write(poolbuf.elems, 0, poolbuf.length);
1711
1712 poolWriter.writePool(out);
1713 poolWriter.reset(); // to save space
1714
1715 out.write(databuf.elems, 0, databuf.length);
1716 }
1717
1718 /**Allows subclasses to write additional class attributes
1719 *
1720 * @return the number of attributes written
1721 */
1722 protected int writeExtraClassAttributes(ClassSymbol c) {
1723 return 0;
1724 }
1725
1726 /**Allows friends to write additional attributes
1727 *
1728 * @return the number of attributes written
1729 */
1730 protected int writeExtraAttributes(Symbol sym) {
1731 int i = 0;
1732 for (ToIntFunction<Symbol> hook : extraAttributeHooks) {
1733 i += hook.applyAsInt(sym);
1734 }
1735 return i;
1736 }
1737
1738 int adjustFlags(final long flags) {
1739 int result = (int)flags;
1740
1741 // Elide strictfp bit in class files
1742 if (target.obsoleteAccStrict())
1743 result &= ~STRICTFP;
1744
1745 if ((flags & BRIDGE) != 0)
1746 result |= ACC_BRIDGE;
1747 if ((flags & VARARGS) != 0)
1748 result |= ACC_VARARGS;
1749 if ((flags & DEFAULT) != 0)
1750 result &= ~ABSTRACT;
1751 return result;
1752 }
1753
1754 long getLastModified(FileObject filename) {
1755 long mod = 0;
1756 try {
1757 mod = filename.getLastModified();
1758 } catch (SecurityException e) {
1759 throw new AssertionError("CRT: couldn't get source file modification date: " + e.getMessage());
1760 }
1761 return mod;
1762 }
1763 }