1 /*
2 * Copyright (c) 2007, 2024, 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.javap;
27
28 import java.lang.reflect.AccessFlag;
29 import java.net.URI;
30 import java.text.DateFormat;
31 import java.util.Collection;
32 import java.util.Date;
33 import java.util.EnumSet;
34 import java.util.List;
35 import java.util.Set;
36
37 import java.lang.constant.ClassDesc;
38 import java.lang.reflect.Modifier;
39 import java.util.ArrayList;
40 import java.util.LinkedHashSet;
41 import java.lang.classfile.AccessFlags;
42 import java.lang.classfile.Attributes;
43 import java.lang.classfile.ClassModel;
44 import java.lang.classfile.ClassSignature;
45 import java.lang.classfile.ClassFile;
46 import static java.lang.classfile.ClassFile.*;
47 import java.lang.classfile.ClassHierarchyResolver;
48 import java.lang.classfile.constantpool.*;
49 import java.lang.classfile.FieldModel;
50 import java.lang.classfile.MethodModel;
51 import java.lang.classfile.MethodSignature;
52 import java.lang.classfile.Signature;
53 import java.lang.classfile.attribute.CodeAttribute;
54 import java.lang.classfile.attribute.SignatureAttribute;
55
56 /*
57 * The main javap class to write the contents of a class file as text.
58 *
59 * <p><b>This is NOT part of any supported API.
60 * If you write code that depends on this, you do so at your own risk.
61 * This code and its internal interfaces are subject to change or
62 * deletion without notice.</b>
63 */
64 public class ClassWriter extends BasicWriter {
65 static ClassWriter instance(Context context) {
66 ClassWriter instance = context.get(ClassWriter.class);
67 if (instance == null)
68 instance = new ClassWriter(context);
69 return instance;
70 }
71
72 protected ClassWriter(Context context) {
73 super(context);
74 context.put(ClassWriter.class, this);
75 options = Options.instance(context);
76 attrWriter = AttributeWriter.instance(context);
77 codeWriter = CodeWriter.instance(context);
78 constantWriter = ConstantWriter.instance(context);
79 sigPrinter = new SignaturePrinter(options.verbose);
80 }
81
82 void setDigest(String name, byte[] digest) {
83 this.digestName = name;
84 this.digest = digest;
85 }
86
87 void setFile(URI uri) {
88 this.uri = uri;
89 }
90
91 void setFileSize(int size) {
92 this.size = size;
93 }
94
95 void setLastModified(long lastModified) {
96 this.lastModified = lastModified;
97 }
98
99 protected ClassModel getClassModel() {
100 return classModel;
101 }
102
103 protected void setClassFile(ClassModel cm) {
104 classModel = cm;
105 }
106
107 protected MethodModel getMethod() {
108 return method;
109 }
110
111 protected void setMethod(MethodModel m) {
112 method = m;
113 }
114
115 public boolean write(ClassModel cm) {
116 errorReported = false;
117 setClassFile(cm);
118
119 if (options.sysInfo || options.verbose) {
120 if (uri != null) {
121 if (uri.getScheme().equals("file"))
122 println("Classfile " + uri.getPath());
123 else
124 println("Classfile " + uri);
125 }
126 indent(+1);
127 if (lastModified != -1) {
128 Date lm = new Date(lastModified);
129 DateFormat df = DateFormat.getDateInstance();
130 if (size > 0) {
131 println("Last modified " + df.format(lm) + "; size " + size
132 + " bytes");
133 } else {
134 println("Last modified " + df.format(lm));
135 }
136 } else if (size > 0) {
137 println("Size " + size + " bytes");
138 }
139 if (digestName != null && digest != null) {
140 StringBuilder sb = new StringBuilder();
141 for (byte b: digest)
142 sb.append(String.format("%02x", b));
143 println(digestName + " checksum " + sb);
144 }
145 }
146
147 cm.findAttribute(Attributes.sourceFile()).ifPresent(sfa ->
148 println("Compiled from \"" + sfa.sourceFile().stringValue() + "\""));
149
150 if (options.sysInfo || options.verbose) {
151 indent(-1);
152 }
153
154 writeModifiers(getClassModifiers(cm.flags()));
155
156 if ((classModel.flags().flagsMask() & ACC_MODULE) != 0) {
157 var attr = classModel.findAttribute(Attributes.module());
158 if (attr.isPresent()) {
159 var modAttr = attr.get();
160 if ((modAttr.moduleFlagsMask() & ACC_OPEN) != 0) {
161 print("open ");
162 }
163 print("module ");
164 print(() -> modAttr.moduleName().name().stringValue());
165 if (modAttr.moduleVersion().isPresent()) {
166 print("@");
167 print(() -> modAttr.moduleVersion().get().stringValue());
168 }
169 } else {
170 // fallback for malformed class files
171 print("class ");
172 print(() -> getJavaName(classModel.thisClass().asInternalName()));
173 }
174 } else {
175 if ((classModel.flags().flagsMask() & ACC_INTERFACE) == 0)
176 print("class ");
177 else
178 print("interface ");
179
180 print(() -> getJavaName(classModel.thisClass().asInternalName()));
181 }
182
183 try {
184 var sigAttr = classModel.findAttribute(Attributes.signature()).orElse(null);
185 if (sigAttr == null) {
186 // use info from class file header
187 if ((classModel.flags().flagsMask() & ACC_INTERFACE) == 0
188 && classModel.superclass().isPresent()) {
189 String sn = getJavaName(classModel.superclass().get().asInternalName());
190 if (!sn.equals("java.lang.Object")) {
191 print(" extends ");
192 print(sn);
193 }
194 }
195 var interfaces = classModel.interfaces();
196 for (int i = 0; i < interfaces.size(); i++) {
197 print(i == 0 ? ((classModel.flags().flagsMask() & ACC_INTERFACE) == 0
198 ? " implements " : " extends ") : ",");
199 print(getJavaName(interfaces.get(i).asInternalName()));
200 }
201 } else {
202 var t = sigAttr.asClassSignature();
203 print(sigPrinter.print(t, (classModel.flags().flagsMask() & ACC_INTERFACE) != 0));
204 }
205 } catch (IllegalArgumentException e) {
206 report(e);
207 }
208
209 if (options.verbose) {
210 println();
211 indent(+1);
212 println("minor version: " + classModel.minorVersion());
213 println("major version: " + classModel.majorVersion());
214 writeList(String.format("flags: (0x%04x) ", cm.flags().flagsMask()),
215 getClassFlags(cm.flags()), "\n");
216 print("this_class: #");print(() -> classModel.thisClass().index());
217 tab();
218 print(() -> "// " + classModel.thisClass().asInternalName());
219 println();
220 print("super_class: #");print(() -> classModel.superclass()
221 .map(ClassEntry::index).orElse(0));
222 try {
223 if (classModel.superclass().isPresent()) {
224 tab();
225 print(() -> "// " + classModel.superclass().get().asInternalName());
226 }
227 } catch (IllegalArgumentException e) {
228 report(e);
229 }
230 println();
231 print("interfaces: ");print(() -> classModel.interfaces().size());
232 print(", fields: " + classModel.fields().size());
233 print(", methods: " + classModel.methods().size());
234 println(", attributes: " + classModel.attributes().size());
235 indent(-1);
236 constantWriter.writeConstantPool();
237 } else {
238 print(" ");
239 }
240
241 println("{");
242 indent(+1);
243 if ((cm.flags().flagsMask() & ACC_MODULE) != 0 && !options.verbose) {
244 writeDirectives();
245 }
246 writeFields();
247 writeMethods();
248 indent(-1);
249 println("}");
250
251 if (options.verbose) {
252 attrWriter.write(classModel.attributes());
253 }
254
255 if (options.verify) {
256 var vErrors = VERIFIER.verify(classModel);
257 if (!vErrors.isEmpty()) {
258 println();
259 for (var ve : vErrors) {
260 println(ve.getMessage());
261 }
262 errorReported = true;
263 }
264 }
265 return !errorReported;
266 }
267 // where
268
269 private static final ClassFile VERIFIER = ClassFile.of(ClassFile.ClassHierarchyResolverOption.of(
270 ClassHierarchyResolver.defaultResolver().orElse(new ClassHierarchyResolver() {
271 @Override
272 public ClassHierarchyResolver.ClassHierarchyInfo getClassInfo(ClassDesc classDesc) {
273 // mark all unresolved classes as interfaces to exclude them from assignability verification
274 return ClassHierarchyInfo.ofInterface();
275 }
276 })));
277
278 final SignaturePrinter sigPrinter;
279
280 public static record SignaturePrinter(boolean verbose) {
281
282 public String print(ClassSignature cs, boolean isInterface) {
283 var sb = new StringBuilder();
284 print(sb, cs.typeParameters());
285 if (isInterface) {
286 String sep = " extends ";
287 for (var is : cs.superinterfaceSignatures()) {
288 sb.append(sep);
289 print(sb, is);
290 sep = ", ";
291 }
292 } else {
293 if (cs.superclassSignature() != null
294 && (verbose || !isObject(cs.superclassSignature()))) {
295 sb.append(" extends ");
296 print(sb, cs.superclassSignature());
297 }
298 String sep = " implements ";
299 for (var is : cs.superinterfaceSignatures()) {
300 sb.append(sep);
301 print(sb, is);
302 sep = ", ";
303 }
304 }
305 return sb.toString();
306 }
307
308 public String print(Signature sig) {
309 var sb = new StringBuilder();
310 print(sb, sig);
311 return sb.toString();
312 }
313
314 public String printTypeParams(List<Signature.TypeParam> tps) {
315 var sb = new StringBuilder();
316 print(sb, tps);
317 return sb.toString();
318 }
319
320 public String printList(String prefix, List<? extends Signature> args,
321 String postfix) {
322 var sb = new StringBuilder();
323 sb.append(prefix);
324 String sep = "";
325 for (var arg : args) {
326 sb.append(sep);
327 print(sb, arg);
328 sep = ", ";
329 }
330 return sb.append(postfix).toString();
331 }
332
333 private boolean isObject(Signature sig) {
334 return (sig instanceof Signature.ClassTypeSig cts)
335 && cts.outerType().isEmpty()
336 && cts.className().equals("java/lang/Object")
337 && (cts.typeArgs().isEmpty());
338 }
339
340 private void print(StringBuilder sb, List<Signature.TypeParam> tps) {
341 if (!tps.isEmpty()) {
342 sb.append('<');
343 String sep = "";
344 for (var tp : tps) {
345 sb.append(sep).append(tp.identifier());
346 sep = " extends ";
347 if (tp.classBound().isPresent()
348 && (verbose || !isObject(tp.classBound().get()))) {
349 sb.append(sep);
350 print(sb, tp.classBound().get());
351 sep = " & ";
352 }
353 for (var bound: tp.interfaceBounds()) {
354 sb.append(sep);
355 print(sb, bound);
356 sep = " & ";
357 }
358 sep = ", ";
359 }
360 sb.append('>');
361 }
362 }
363
364 private void print(StringBuilder sb, Signature sig) {
365 if (sig instanceof Signature.BaseTypeSig bts) {
366 sb.append(ClassDesc.ofDescriptor("" + bts.baseType()).displayName());
367 } else if (sig instanceof Signature.ClassTypeSig cts) {
368 if (cts.outerType().isPresent()) {
369 print(sb, cts.outerType().get());
370 sb.append(".");
371 }
372 sb.append(getJavaName(cts.className()));
373 if (!cts.typeArgs().isEmpty()) {
374 String sep = "";
375 sb.append('<');
376 for (var ta : cts.typeArgs()) {
377 sb.append(sep);
378 print(sb, ta);
379 sep = ", ";
380 }
381 sb.append('>');
382 }
383 } else if (sig instanceof Signature.TypeVarSig tvs) {
384 sb.append(tvs.identifier());
385 } else if (sig instanceof Signature.ArrayTypeSig ats) {
386 print(sb, ats.componentSignature());
387 sb.append("[]");
388 }
389 }
390
391 private void print(StringBuilder sb, Signature.TypeArg ta) {
392 switch (ta) {
393 case Signature.TypeArg.Unbounded _ -> sb.append('?');
394 case Signature.TypeArg.Bounded bta -> {
395 switch (bta.wildcardIndicator()) {
396 case NONE -> print(sb, bta.boundType());
397 case EXTENDS -> {
398 sb.append("? extends ");
399 print(sb, bta.boundType());
400 }
401 case SUPER -> {
402 sb.append("? super ");
403 print(sb, bta.boundType());
404 }
405 }
406 }
407 }
408 }
409 }
410
411 protected void writeFields() {
412 for (var f: classModel.fields()) {
413 writeField(f);
414 }
415 }
416
417 protected void writeField(FieldModel f) {
418 if (!options.checkAccess(f.flags().flagsMask()))
419 return;
420
421 var flags = f.flags();
422 writeModifiers(flagsReportUnknown(flags).stream().filter(fl -> fl.sourceModifier())
423 .map(fl -> Modifier.toString(fl.mask())).toList());
424 print(() -> sigPrinter.print(
425 f.findAttribute(Attributes.signature())
426 .map(SignatureAttribute::asTypeSignature)
427 .orElseGet(() -> Signature.of(f.fieldTypeSymbol()))));
428 print(" ");
429 print(() -> f.fieldName().stringValue());
430 if (options.showConstants) {
431 var a = f.findAttribute(Attributes.constantValue());
432 if (a.isPresent()) {
433 print(" = ");
434 var cv = a.get();
435 print(() -> getConstantValue(f.fieldTypeSymbol(), cv.constant()));
436 }
437 }
438 print(";");
439 println();
440
441 indent(+1);
442
443 boolean showBlank = false;
444
445 if (options.showDescriptors) {
446 print("descriptor: ");println(() -> f.fieldType().stringValue());
447 }
448
449 if (options.verbose)
450 writeList(String.format("flags: (0x%04x) ", flags.flagsMask()),
451 flagsReportUnknown(flags).stream().map(fl -> "ACC_" + fl.name()).toList(),
452 "\n");
453
454 if (options.showAllAttrs) {
455 attrWriter.write(f.attributes());
456 showBlank = true;
457 }
458
459 indent(-1);
460
461 if (showBlank || options.showDisassembled || options.showLineAndLocalVariableTables)
462 println();
463 }
464
465 protected void writeMethods() {
466 for (MethodModel m: classModel.methods())
467 writeMethod(m);
468 setPendingNewline(false);
469 }
470
471 private static final int DEFAULT_ALLOWED_MAJOR_VERSION = 52;
472 private static final int DEFAULT_ALLOWED_MINOR_VERSION = 0;
473
474 protected void writeMethod(MethodModel m) {
475 if (!options.checkAccess(m.flags().flagsMask()))
476 return;
477
478 method = m;
479
480 int flags = m.flags().flagsMask();
481
482 var modifiers = new ArrayList<String>();
483 for (var f : flagsReportUnknown(m.flags()))
484 if (f.sourceModifier()) modifiers.add(Modifier.toString(f.mask()));
485
486 String name = "???";
487 try {
488 name = m.methodName().stringValue();
489 } catch (IllegalArgumentException e) {
490 report(e);
491 }
492
493 if ((classModel.flags().flagsMask() & ACC_INTERFACE) != 0 &&
494 ((flags & ACC_ABSTRACT) == 0) && !name.equals("<clinit>")) {
495 if (classModel.majorVersion() > DEFAULT_ALLOWED_MAJOR_VERSION ||
496 (classModel.majorVersion() == DEFAULT_ALLOWED_MAJOR_VERSION
497 && classModel.minorVersion() >= DEFAULT_ALLOWED_MINOR_VERSION)) {
498 if ((flags & (ACC_STATIC | ACC_PRIVATE)) == 0) {
499 modifiers.add("default");
500 }
501 }
502 }
503 writeModifiers(modifiers);
504
505 try {
506 var sigAttr = m.findAttribute(Attributes.signature());
507 MethodSignature d;
508 if (sigAttr.isEmpty()) {
509 d = MethodSignature.parseFrom(m.methodType().stringValue());
510 } else {
511 d = sigAttr.get().asMethodSignature();
512 }
513
514 if (!d.typeParameters().isEmpty()) {
515 print(sigPrinter.printTypeParams(d.typeParameters()) + " ");
516 }
517 switch (name) {
518 case "<init>":
519 print(getJavaName(classModel.thisClass().asInternalName()));
520 print(getJavaParameterTypes(d, flags));
521 break;
522 case "<clinit>":
523 print("{}");
524 break;
525 default:
526 print(getJavaName(sigPrinter.print(d.result())));
527 print(" ");
528 print(name);
529 print(getJavaParameterTypes(d, flags));
530 break;
531 }
532
533 var e_attr = m.findAttribute(Attributes.exceptions());
534 // if there are generic exceptions, there must be erased exceptions
535 if (e_attr.isPresent()) {
536 var exceptions = e_attr.get();
537 print(" throws ");
538 if (d != null && !d.throwableSignatures().isEmpty()) { // use generic list if available
539 print(() -> sigPrinter.printList("", d.throwableSignatures(), ""));
540 } else {
541 var exNames = exceptions.exceptions();
542 for (int i = 0; i < exNames.size(); i++) {
543 if (i > 0)
544 print(", ");
545 int ii = i;
546 print(() -> getJavaName(exNames.get(ii).asInternalName()));
547 }
548 }
549 }
550 } catch (IllegalArgumentException e) {
551 report(e);
552 }
553
554 println(";");
555
556 indent(+1);
557
558 if (options.showDescriptors) {
559 print("descriptor: ");println(() -> m.methodType().stringValue());
560 }
561
562 if (options.verbose) {
563 StringBuilder sb = new StringBuilder();
564 String sep = "";
565 sb.append(String.format("flags: (0x%04x) ", flags));
566 for (var f : flagsReportUnknown(m.flags())) {
567 sb.append(sep).append("ACC_").append(f.name());
568 sep = ", ";
569 }
570 println(sb.toString());
571 }
572
573 var code = (CodeAttribute)m.code().orElse(null);
574
575 if (options.showAllAttrs) {
576 attrWriter.write(m.attributes());
577 } else if (code != null) {
578 if (options.showDisassembled) {
579 codeWriter.writeMinimal(code);
580 }
581
582 if (options.showLineAndLocalVariableTables) {
583 code.findAttribute(Attributes.lineNumberTable())
584 .ifPresent(a -> attrWriter.write(a, code));
585 code.findAttribute(Attributes.localVariableTable())
586 .ifPresent(a -> attrWriter.write(a, code));
587 }
588 }
589
590 indent(-1);
591
592 // set pendingNewline to write a newline before the next method (if any)
593 // if a separator is desired
594 setPendingNewline(
595 options.showDisassembled ||
596 options.showAllAttrs ||
597 options.showDescriptors ||
598 options.showLineAndLocalVariableTables ||
599 options.verbose);
600 }
601
602 void writeModifiers(Collection<String> items) {
603 for (Object item: items) {
604 print(item);
605 print(" ");
606 }
607 }
608
609 public static final int ACC_TRANSITIVE = 0x0020;
610 public static final int ACC_STATIC_PHASE = 0x0040;
611
612 void writeDirectives() {
613 var attr = classModel.findAttribute(Attributes.module());
614 if (attr.isEmpty())
615 return;
616
617 var m = attr.get();
618 for (var entry: m.requires()) {
619 print("requires");
620 if ((entry.requiresFlagsMask() & ACC_STATIC_PHASE) != 0)
621 print(" static");
622 if ((entry.requiresFlagsMask() & ACC_TRANSITIVE) != 0)
623 print(" transitive");
624 print(" ");
625 String mname;
626 print(entry.requires().name().stringValue());
627 println(";");
628 }
629
630 for (var entry: m.exports()) {
631 print("exports");
632 print(" ");
633 print(entry.exportedPackage().name().stringValue().replace('/', '.'));
634 boolean first = true;
635 for (var mod: entry.exportsTo()) {
636 if (first) {
637 println(" to");
638 indent(+1);
639 first = false;
640 } else {
641 println(",");
642 }
643 print(mod.name().stringValue());
644 }
645 println(";");
646 if (!first)
647 indent(-1);
648 }
649
650 for (var entry: m.opens()) {
651 print("opens");
652 print(" ");
653 print(entry.openedPackage().name().stringValue().replace('/', '.'));
654 boolean first = true;
655 for (var mod: entry.opensTo()) {
656 if (first) {
657 println(" to");
658 indent(+1);
659 first = false;
660 } else {
661 println(",");
662 }
663 print(mod.name().stringValue());
664 }
665 println(";");
666 if (!first)
667 indent(-1);
668 }
669
670 for (var entry: m.uses()) {
671 print("uses ");
672 print(entry.asInternalName().replace('/', '.'));
673 println(";");
674 }
675
676 for (var entry: m.provides()) {
677 print("provides ");
678 print(entry.provides().asInternalName().replace('/', '.'));
679 boolean first = true;
680 for (var ce: entry.providesWith()) {
681 if (first) {
682 println(" with");
683 indent(+1);
684 first = false;
685 } else {
686 println(",");
687 }
688 print(ce.asInternalName().replace('/', '.'));
689 }
690 println(";");
691 if (!first)
692 indent(-1);
693 }
694 }
695
696 void writeList(String prefix, Collection<?> items, String suffix) {
697 print(prefix);
698 String sep = "";
699 for (Object item: items) {
700 print(sep);
701 print(item);
702 sep = ", ";
703 }
704 print(suffix);
705 }
706
707 void writeListIfNotEmpty(String prefix, List<?> items, String suffix) {
708 if (items != null && items.size() > 0)
709 writeList(prefix, items, suffix);
710 }
711
712 String adjustVarargs(int flags, String params) {
713 if ((flags & ACC_VARARGS) != 0) {
714 int i = params.lastIndexOf("[]");
715 if (i > 0)
716 return params.substring(0, i) + "..." + params.substring(i+2);
717 }
718
719 return params;
720 }
721
722 String getJavaParameterTypes(MethodSignature d, int flags) {
723 return getJavaName(adjustVarargs(flags,
724 sigPrinter.printList("(", d.arguments(), ")")));
725 }
726
727 static String getJavaName(String name) {
728 return name.replace('/', '.');
729 }
730
731 /**
732 * Get the value of an entry in the constant pool as a Java constant.
733 * Characters and booleans are represented by CONSTANT_Intgere entries.
734 * Character and string values are processed to escape characters outside
735 * the basic printable ASCII set.
736 * @param d the descriptor, giving the expected type of the constant
737 * @param index the index of the value in the constant pool
738 * @return a printable string containing the value of the constant.
739 */
740 String getConstantValue(ClassDesc d, ConstantValueEntry cpInfo) {
741 switch (cpInfo.tag()) {
742 case PoolEntry.TAG_INTEGER: {
743 var val = (Integer)cpInfo.constantValue();
744 switch (d.descriptorString()) {
745 case "C":
746 // character
747 return getConstantCharValue((char)val.intValue());
748 case "Z":
749 // boolean
750 return String.valueOf(val == 1);
751 default:
752 // other: assume integer
753 return String.valueOf(val);
754 }
755 }
756 case PoolEntry.TAG_STRING:
757 return getConstantStringValue(cpInfo.constantValue().toString());
758 default:
759 return constantWriter.stringValue(cpInfo);
760 }
761 }
762
763 private String getConstantCharValue(char c) {
764 StringBuilder sb = new StringBuilder();
765 sb.append('\'');
766 sb.append(esc(c, '\''));
767 sb.append('\'');
768 return sb.toString();
769 }
770
771 private String getConstantStringValue(String s) {
772 StringBuilder sb = new StringBuilder();
773 sb.append("\"");
774 for (int i = 0; i < s.length(); i++) {
775 sb.append(esc(s.charAt(i), '"'));
776 }
777 sb.append("\"");
778 return sb.toString();
779 }
780
781 private String esc(char c, char quote) {
782 if (32 <= c && c <= 126 && c != quote && c != '\\')
783 return String.valueOf(c);
784 else switch (c) {
785 case '\b': return "\\b";
786 case '\n': return "\\n";
787 case '\t': return "\\t";
788 case '\f': return "\\f";
789 case '\r': return "\\r";
790 case '\\': return "\\\\";
791 case '\'': return "\\'";
792 case '\"': return "\\\"";
793 default: return String.format("\\u%04x", (int) c);
794 }
795 }
796
797 private Set<String> getClassModifiers(AccessFlags flags) {
798 var flagSet = flagsReportUnknown(flags);
799 Set<AccessFlag> set;
800 if (flagSet.contains(AccessFlag.INTERFACE)) {
801 set = EnumSet.copyOf(flagSet);
802 set.remove(AccessFlag.ABSTRACT);
803 } else {
804 set = flagSet;
805 }
806 return getModifiers(set);
807 }
808
809 private static Set<String> getModifiers(Set<java.lang.reflect.AccessFlag> flags) {
810 Set<String> s = new LinkedHashSet<>();
811 for (var f : flags)
812 if (f.sourceModifier()) s.add(Modifier.toString(f.mask()));
813 return s;
814 }
815
816 private Set<String> getClassFlags(AccessFlags flags) {
817 return getFlags(flags.flagsMask(), flagsReportUnknown(flags));
818 }
819
820 private static Set<String> getFlags(int mask, Set<java.lang.reflect.AccessFlag> flags) {
821 Set<String> s = new LinkedHashSet<>();
822 for (var f: flags) {
823 s.add("ACC_" + f.name());
824 mask = mask & ~f.mask();
825 }
826 while (mask != 0) {
827 int bit = Integer.highestOneBit(mask);
828 s.add("0x" + Integer.toHexString(bit));
829 mask = mask & ~bit;
830 }
831 return s;
832 }
833
834 private final Options options;
835 private final AttributeWriter attrWriter;
836 private final CodeWriter codeWriter;
837 private final ConstantWriter constantWriter;
838 private ClassModel classModel;
839 private URI uri;
840 private long lastModified;
841 private String digestName;
842 private byte[] digest;
843 private int size;
844 private MethodModel method;
845 }