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
42 import com.sun.tools.javac.code.Source;
43 import java.lang.classfile.AccessFlags;
44 import java.lang.classfile.Attributes;
45 import java.lang.classfile.ClassModel;
46 import java.lang.classfile.ClassSignature;
47 import java.lang.classfile.ClassFile;
48 import static java.lang.classfile.ClassFile.*;
49 import java.lang.classfile.ClassHierarchyResolver;
50 import java.lang.classfile.constantpool.*;
51 import java.lang.classfile.FieldModel;
52 import java.lang.classfile.MethodModel;
53 import java.lang.classfile.MethodSignature;
54 import java.lang.classfile.Signature;
55 import java.lang.classfile.attribute.CodeAttribute;
56 import java.lang.classfile.attribute.SignatureAttribute;
57
58 /*
59 * The main javap class to write the contents of a class file as text.
60 *
61 * <p><b>This is NOT part of any supported API.
62 * If you write code that depends on this, you do so at your own risk.
63 * This code and its internal interfaces are subject to change or
64 * deletion without notice.</b>
65 */
66 public class ClassWriter extends BasicWriter {
67 static ClassWriter instance(Context context) {
68 ClassWriter instance = context.get(ClassWriter.class);
69 if (instance == null)
70 instance = new ClassWriter(context);
71 return instance;
72 }
73
74 protected ClassWriter(Context context) {
75 super(context);
76 context.put(ClassWriter.class, this);
77 options = Options.instance(context);
78 attrWriter = AttributeWriter.instance(context);
79 codeWriter = CodeWriter.instance(context);
80 constantWriter = ConstantWriter.instance(context);
81 sigPrinter = new SignaturePrinter(options.verbose);
82 }
83
84 void setDigest(String name, byte[] digest) {
85 this.digestName = name;
86 this.digest = digest;
87 }
88
89 void setFile(URI uri) {
90 this.uri = uri;
91 }
92
93 void setFileSize(int size) {
94 this.size = size;
95 }
96
97 void setLastModified(long lastModified) {
98 this.lastModified = lastModified;
99 }
100
101 protected ClassModel getClassModel() {
102 return classModel;
103 }
104
105 protected void setClassFile(ClassModel cm) {
106 classModel = cm;
107 }
108
109 protected MethodModel getMethod() {
110 return method;
111 }
112
113 protected void setMethod(MethodModel m) {
114 method = m;
115 }
116
117 public boolean write(ClassModel cm) {
118 errorReported = false;
119 setClassFile(cm);
120
121 if (options.sysInfo || options.verbose) {
122 if (uri != null) {
123 if (uri.getScheme().equals("file"))
124 println("Classfile " + uri.getPath());
125 else
126 println("Classfile " + uri);
127 }
128 indent(+1);
129 if (lastModified != -1) {
130 Date lm = new Date(lastModified);
131 DateFormat df = DateFormat.getDateInstance();
132 if (size > 0) {
133 println("Last modified " + df.format(lm) + "; size " + size
134 + " bytes");
135 } else {
136 println("Last modified " + df.format(lm));
137 }
138 } else if (size > 0) {
139 println("Size " + size + " bytes");
140 }
141 if (digestName != null && digest != null) {
142 StringBuilder sb = new StringBuilder();
143 for (byte b: digest)
144 sb.append(String.format("%02x", b));
145 println(digestName + " checksum " + sb);
146 }
147 }
148
149 cm.findAttribute(Attributes.sourceFile()).ifPresent(sfa ->
150 println("Compiled from \"" + sfa.sourceFile().stringValue() + "\""));
151
152 if (options.sysInfo || options.verbose) {
153 indent(-1);
154 }
155
156 writeModifiers(getClassModifiers(cm.flags(), classModel.majorVersion(), classModel.minorVersion()));
157
158 if ((classModel.flags().flagsMask() & ACC_MODULE) != 0) {
159 var attr = classModel.findAttribute(Attributes.module());
160 if (attr.isPresent()) {
161 var modAttr = attr.get();
162 if ((modAttr.moduleFlagsMask() & ACC_OPEN) != 0) {
163 print("open ");
164 }
165 print("module ");
166 print(() -> modAttr.moduleName().name().stringValue());
167 if (modAttr.moduleVersion().isPresent()) {
168 print("@");
169 print(() -> modAttr.moduleVersion().get().stringValue());
170 }
171 } else {
172 // fallback for malformed class files
173 print("class ");
174 print(() -> getJavaName(classModel.thisClass().asInternalName()));
175 }
176 } else {
177 if ((classModel.flags().flagsMask() & ACC_INTERFACE) == 0)
178 print("class ");
179 else
180 print("interface ");
181
182 print(() -> getJavaName(classModel.thisClass().asInternalName()));
183 }
184
185 try {
186 var sigAttr = classModel.findAttribute(Attributes.signature()).orElse(null);
187 if (sigAttr == null) {
188 // use info from class file header
189 if ((classModel.flags().flagsMask() & ACC_INTERFACE) == 0
190 && classModel.superclass().isPresent()) {
191 String sn = getJavaName(classModel.superclass().get().asInternalName());
192 if (!sn.equals("java.lang.Object")) {
193 print(" extends ");
194 print(sn);
195 }
196 }
197 var interfaces = classModel.interfaces();
198 for (int i = 0; i < interfaces.size(); i++) {
199 print(i == 0 ? ((classModel.flags().flagsMask() & ACC_INTERFACE) == 0
200 ? " implements " : " extends ") : ",");
201 print(getJavaName(interfaces.get(i).asInternalName()));
202 }
203 } else {
204 var t = sigAttr.asClassSignature();
205 print(sigPrinter.print(t, (classModel.flags().flagsMask() & ACC_INTERFACE) != 0));
206 }
207 } catch (IllegalArgumentException e) {
208 report(e);
209 }
210
211 if (options.verbose) {
212 println();
213 indent(+1);
214 println("minor version: " + classModel.minorVersion());
215 println("major version: " + classModel.majorVersion());
216 writeList(String.format("flags: (0x%04x) ", cm.flags().flagsMask()),
217 getClassFlags(cm.flags()), "\n");
218 print("this_class: #");print(() -> classModel.thisClass().index());
219 tab();
220 print(() -> "// " + classModel.thisClass().asInternalName());
221 println();
222 print("super_class: #");print(() -> classModel.superclass()
223 .map(ClassEntry::index).orElse(0));
224 try {
225 if (classModel.superclass().isPresent()) {
226 tab();
227 print(() -> "// " + classModel.superclass().get().asInternalName());
228 }
229 } catch (IllegalArgumentException e) {
230 report(e);
231 }
232 println();
233 print("interfaces: ");print(() -> classModel.interfaces().size());
234 print(", fields: " + classModel.fields().size());
235 print(", methods: " + classModel.methods().size());
236 println(", attributes: " + classModel.attributes().size());
237 indent(-1);
238 constantWriter.writeConstantPool();
239 } else {
240 print(" ");
241 }
242
243 println("{");
244 indent(+1);
245 if ((cm.flags().flagsMask() & ACC_MODULE) != 0 && !options.verbose) {
246 writeDirectives();
247 }
248 writeFields();
249 writeMethods();
250 indent(-1);
251 println("}");
252
253 if (options.verbose) {
254 attrWriter.write(classModel.attributes());
255 }
256
257 if (options.verify) {
258 var vErrors = VERIFIER.verify(classModel);
259 if (!vErrors.isEmpty()) {
260 println();
261 for (var ve : vErrors) {
262 println(ve.getMessage());
263 }
264 errorReported = true;
265 }
266 }
267 return !errorReported;
268 }
269 // where
270
271 private static final ClassFile VERIFIER = ClassFile.of(ClassFile.ClassHierarchyResolverOption.of(
272 ClassHierarchyResolver.defaultResolver().orElse(new ClassHierarchyResolver() {
273 @Override
274 public ClassHierarchyResolver.ClassHierarchyInfo getClassInfo(ClassDesc classDesc) {
275 // mark all unresolved classes as interfaces to exclude them from assignability verification
276 return ClassHierarchyInfo.ofInterface();
277 }
278 })));
279
280 final SignaturePrinter sigPrinter;
281
282 public static record SignaturePrinter(boolean verbose) {
283
284 public String print(ClassSignature cs, boolean isInterface) {
285 var sb = new StringBuilder();
286 print(sb, cs.typeParameters());
287 if (isInterface) {
288 String sep = " extends ";
289 for (var is : cs.superinterfaceSignatures()) {
290 sb.append(sep);
291 print(sb, is);
292 sep = ", ";
293 }
294 } else {
295 if (cs.superclassSignature() != null
296 && (verbose || !isObject(cs.superclassSignature()))) {
297 sb.append(" extends ");
298 print(sb, cs.superclassSignature());
299 }
300 String sep = " implements ";
301 for (var is : cs.superinterfaceSignatures()) {
302 sb.append(sep);
303 print(sb, is);
304 sep = ", ";
305 }
306 }
307 return sb.toString();
308 }
309
310 public String print(Signature sig) {
311 var sb = new StringBuilder();
312 print(sb, sig);
313 return sb.toString();
314 }
315
316 public String printTypeParams(List<Signature.TypeParam> tps) {
317 var sb = new StringBuilder();
318 print(sb, tps);
319 return sb.toString();
320 }
321
322 public String printList(String prefix, List<? extends Signature> args,
323 String postfix) {
324 var sb = new StringBuilder();
325 sb.append(prefix);
326 String sep = "";
327 for (var arg : args) {
328 sb.append(sep);
329 print(sb, arg);
330 sep = ", ";
331 }
332 return sb.append(postfix).toString();
333 }
334
335 private boolean isObject(Signature sig) {
336 return (sig instanceof Signature.ClassTypeSig cts)
337 && cts.outerType().isEmpty()
338 && cts.className().equals("java/lang/Object")
339 && (cts.typeArgs().isEmpty());
340 }
341
342 private void print(StringBuilder sb, List<Signature.TypeParam> tps) {
343 if (!tps.isEmpty()) {
344 sb.append('<');
345 String sep = "";
346 for (var tp : tps) {
347 sb.append(sep).append(tp.identifier());
348 sep = " extends ";
349 if (tp.classBound().isPresent()
350 && (verbose || !isObject(tp.classBound().get()))) {
351 sb.append(sep);
352 print(sb, tp.classBound().get());
353 sep = " & ";
354 }
355 for (var bound: tp.interfaceBounds()) {
356 sb.append(sep);
357 print(sb, bound);
358 sep = " & ";
359 }
360 sep = ", ";
361 }
362 sb.append('>');
363 }
364 }
365
366 private void print(StringBuilder sb, Signature sig) {
367 if (sig instanceof Signature.BaseTypeSig bts) {
368 sb.append(ClassDesc.ofDescriptor("" + bts.baseType()).displayName());
369 } else if (sig instanceof Signature.ClassTypeSig cts) {
370 if (cts.outerType().isPresent()) {
371 print(sb, cts.outerType().get());
372 sb.append(".");
373 }
374 sb.append(getJavaName(cts.className()));
375 if (!cts.typeArgs().isEmpty()) {
376 String sep = "";
377 sb.append('<');
378 for (var ta : cts.typeArgs()) {
379 sb.append(sep);
380 print(sb, ta);
381 sep = ", ";
382 }
383 sb.append('>');
384 }
385 } else if (sig instanceof Signature.TypeVarSig tvs) {
386 sb.append(tvs.identifier());
387 } else if (sig instanceof Signature.ArrayTypeSig ats) {
388 print(sb, ats.componentSignature());
389 sb.append("[]");
390 }
391 }
392
393 private void print(StringBuilder sb, Signature.TypeArg ta) {
394 switch (ta) {
395 case Signature.TypeArg.Unbounded _ -> sb.append('?');
396 case Signature.TypeArg.Bounded bta -> {
397 switch (bta.wildcardIndicator()) {
398 case NONE -> print(sb, bta.boundType());
399 case EXTENDS -> {
400 sb.append("? extends ");
401 print(sb, bta.boundType());
402 }
403 case SUPER -> {
404 sb.append("? super ");
405 print(sb, bta.boundType());
406 }
407 }
408 }
409 }
410 }
411 }
412
413 protected void writeFields() {
414 for (var f: classModel.fields()) {
415 writeField(f);
416 }
417 }
418
419 protected void writeField(FieldModel f) {
420 if (!options.checkAccess(f.flags().flagsMask()))
421 return;
422
423 var flags = f.flags();
424 writeModifiers(flagsReportUnknown(flags).stream().filter(fl -> fl.sourceModifier())
425 .map(fl -> Modifier.toString(fl.mask())).toList());
426 print(() -> sigPrinter.print(
427 f.findAttribute(Attributes.signature())
428 .map(SignatureAttribute::asTypeSignature)
429 .orElseGet(() -> Signature.of(f.fieldTypeSymbol()))));
430 print(" ");
431 print(() -> f.fieldName().stringValue());
432 if (options.showConstants) {
433 var a = f.findAttribute(Attributes.constantValue());
434 if (a.isPresent()) {
435 print(" = ");
436 var cv = a.get();
437 print(() -> getConstantValue(f.fieldTypeSymbol(), cv.constant()));
438 }
439 }
440 print(";");
441 println();
442
443 indent(+1);
444
445 boolean showBlank = false;
446
447 if (options.showDescriptors) {
448 print("descriptor: ");println(() -> f.fieldType().stringValue());
449 }
450
451 if (options.verbose)
452 writeList(String.format("flags: (0x%04x) ", flags.flagsMask()),
453 flagsReportUnknown(flags).stream().map(fl -> "ACC_" + fl.toString()).toList(),
454 "\n");
455
456 if (options.showAllAttrs) {
457 attrWriter.write(f.attributes());
458 showBlank = true;
459 }
460
461 indent(-1);
462
463 if (showBlank || options.showDisassembled || options.showLineAndLocalVariableTables)
464 println();
465 }
466
467 protected void writeMethods() {
468 for (MethodModel m: classModel.methods())
469 writeMethod(m);
470 setPendingNewline(false);
471 }
472
473 private static final int DEFAULT_ALLOWED_MAJOR_VERSION = 52;
474 private static final int DEFAULT_ALLOWED_MINOR_VERSION = 0;
475
476 protected void writeMethod(MethodModel m) {
477 if (!options.checkAccess(m.flags().flagsMask()))
478 return;
479
480 method = m;
481
482 int flags = m.flags().flagsMask();
483
484 var modifiers = new ArrayList<String>();
485 for (var f : flagsReportUnknown(m.flags()))
486 if (f.sourceModifier()) modifiers.add(Modifier.toString(f.mask()));
487
488 String name = "???";
489 try {
490 name = m.methodName().stringValue();
491 } catch (IllegalArgumentException e) {
492 report(e);
493 }
494
495 if ((classModel.flags().flagsMask() & ACC_INTERFACE) != 0 &&
496 ((flags & ACC_ABSTRACT) == 0) && !name.equals("<clinit>")) {
497 if (classModel.majorVersion() > DEFAULT_ALLOWED_MAJOR_VERSION ||
498 (classModel.majorVersion() == DEFAULT_ALLOWED_MAJOR_VERSION
499 && classModel.minorVersion() >= DEFAULT_ALLOWED_MINOR_VERSION)) {
500 if ((flags & (ACC_STATIC | ACC_PRIVATE)) == 0) {
501 modifiers.add("default");
502 }
503 }
504 }
505 writeModifiers(modifiers);
506
507 try {
508 var sigAttr = m.findAttribute(Attributes.signature());
509 MethodSignature d;
510 if (sigAttr.isEmpty()) {
511 d = MethodSignature.parseFrom(m.methodType().stringValue());
512 } else {
513 d = sigAttr.get().asMethodSignature();
514 }
515
516 if (!d.typeParameters().isEmpty()) {
517 print(sigPrinter.printTypeParams(d.typeParameters()) + " ");
518 }
519 switch (name) {
520 case "<init>":
521 print(getJavaName(classModel.thisClass().asInternalName()));
522 print(getJavaParameterTypes(d, flags));
523 break;
524 case "<clinit>":
525 print("{}");
526 break;
527 default:
528 print(getJavaName(sigPrinter.print(d.result())));
529 print(" ");
530 print(name);
531 print(getJavaParameterTypes(d, flags));
532 break;
533 }
534
535 var e_attr = m.findAttribute(Attributes.exceptions());
536 // if there are generic exceptions, there must be erased exceptions
537 if (e_attr.isPresent()) {
538 var exceptions = e_attr.get();
539 print(" throws ");
540 if (d != null && !d.throwableSignatures().isEmpty()) { // use generic list if available
541 print(() -> sigPrinter.printList("", d.throwableSignatures(), ""));
542 } else {
543 var exNames = exceptions.exceptions();
544 for (int i = 0; i < exNames.size(); i++) {
545 if (i > 0)
546 print(", ");
547 int ii = i;
548 print(() -> getJavaName(exNames.get(ii).asInternalName()));
549 }
550 }
551 }
552 } catch (IllegalArgumentException e) {
553 report(e);
554 }
555
556 println(";");
557
558 indent(+1);
559
560 if (options.showDescriptors) {
561 print("descriptor: ");println(() -> m.methodType().stringValue());
562 }
563
564 if (options.verbose) {
565 StringBuilder sb = new StringBuilder();
566 String sep = "";
567 sb.append(String.format("flags: (0x%04x) ", flags));
568 for (var f : flagsReportUnknown(m.flags())) {
569 sb.append(sep).append("ACC_").append(f.name());
570 sep = ", ";
571 }
572 println(sb.toString());
573 }
574
575 var code = (CodeAttribute)m.code().orElse(null);
576
577 if (options.showAllAttrs) {
578 attrWriter.write(m.attributes());
579 } else if (code != null) {
580 if (options.showDisassembled) {
581 println("Code:");
582 codeWriter.writeInstrs(code);
583 codeWriter.writeExceptionTable(code);
584 }
585
586 if (options.showLineAndLocalVariableTables) {
587 code.findAttribute(Attributes.lineNumberTable())
588 .ifPresent(a -> attrWriter.write(a, code));
589 code.findAttribute(Attributes.localVariableTable())
590 .ifPresent(a -> attrWriter.write(a, code));
591 }
592 }
593
594 indent(-1);
595
596 // set pendingNewline to write a newline before the next method (if any)
597 // if a separator is desired
598 setPendingNewline(
599 options.showDisassembled ||
600 options.showAllAttrs ||
601 options.showDescriptors ||
602 options.showLineAndLocalVariableTables ||
603 options.verbose);
604 }
605
606 void writeModifiers(Collection<String> items) {
607 for (Object item: items) {
608 print(item);
609 print(" ");
610 }
611 }
612
613 public static final int ACC_TRANSITIVE = 0x0020;
614 public static final int ACC_STATIC_PHASE = 0x0040;
615
616 void writeDirectives() {
617 var attr = classModel.findAttribute(Attributes.module());
618 if (attr.isEmpty())
619 return;
620
621 var m = attr.get();
622 for (var entry: m.requires()) {
623 print("requires");
624 if ((entry.requiresFlagsMask() & ACC_STATIC_PHASE) != 0)
625 print(" static");
626 if ((entry.requiresFlagsMask() & ACC_TRANSITIVE) != 0)
627 print(" transitive");
628 print(" ");
629 String mname;
630 print(entry.requires().name().stringValue());
631 println(";");
632 }
633
634 for (var entry: m.exports()) {
635 print("exports");
636 print(" ");
637 print(entry.exportedPackage().name().stringValue().replace('/', '.'));
638 boolean first = true;
639 for (var mod: entry.exportsTo()) {
640 if (first) {
641 println(" to");
642 indent(+1);
643 first = false;
644 } else {
645 println(",");
646 }
647 print(mod.name().stringValue());
648 }
649 println(";");
650 if (!first)
651 indent(-1);
652 }
653
654 for (var entry: m.opens()) {
655 print("opens");
656 print(" ");
657 print(entry.openedPackage().name().stringValue().replace('/', '.'));
658 boolean first = true;
659 for (var mod: entry.opensTo()) {
660 if (first) {
661 println(" to");
662 indent(+1);
663 first = false;
664 } else {
665 println(",");
666 }
667 print(mod.name().stringValue());
668 }
669 println(";");
670 if (!first)
671 indent(-1);
672 }
673
674 for (var entry: m.uses()) {
675 print("uses ");
676 print(entry.asInternalName().replace('/', '.'));
677 println(";");
678 }
679
680 for (var entry: m.provides()) {
681 print("provides ");
682 print(entry.provides().asInternalName().replace('/', '.'));
683 boolean first = true;
684 for (var ce: entry.providesWith()) {
685 if (first) {
686 println(" with");
687 indent(+1);
688 first = false;
689 } else {
690 println(",");
691 }
692 print(ce.asInternalName().replace('/', '.'));
693 }
694 println(";");
695 if (!first)
696 indent(-1);
697 }
698 }
699
700 void writeList(String prefix, Collection<?> items, String suffix) {
701 print(prefix);
702 String sep = "";
703 for (Object item: items) {
704 print(sep);
705 print(item);
706 sep = ", ";
707 }
708 print(suffix);
709 }
710
711 void writeListIfNotEmpty(String prefix, List<?> items, String suffix) {
712 if (items != null && items.size() > 0)
713 writeList(prefix, items, suffix);
714 }
715
716 String adjustVarargs(int flags, String params) {
717 if ((flags & ACC_VARARGS) != 0) {
718 int i = params.lastIndexOf("[]");
719 if (i > 0)
720 return params.substring(0, i) + "..." + params.substring(i+2);
721 }
722
723 return params;
724 }
725
726 String getJavaParameterTypes(MethodSignature d, int flags) {
727 return getJavaName(adjustVarargs(flags,
728 sigPrinter.printList("(", d.arguments(), ")")));
729 }
730
731 static String getJavaName(String name) {
732 return name.replace('/', '.');
733 }
734
735 /**
736 * Get the value of an entry in the constant pool as a Java constant.
737 * Characters and booleans are represented by CONSTANT_Intgere entries.
738 * Character and string values are processed to escape characters outside
739 * the basic printable ASCII set.
740 * @param d the descriptor, giving the expected type of the constant
741 * @param index the index of the value in the constant pool
742 * @return a printable string containing the value of the constant.
743 */
744 String getConstantValue(ClassDesc d, ConstantValueEntry cpInfo) {
745 switch (cpInfo.tag()) {
746 case ClassFile.TAG_INTEGER: {
747 var val = (Integer)cpInfo.constantValue();
748 switch (d.descriptorString()) {
749 case "C":
750 // character
751 return getConstantCharValue((char)val.intValue());
752 case "Z":
753 // boolean
754 return String.valueOf(val == 1);
755 default:
756 // other: assume integer
757 return String.valueOf(val);
758 }
759 }
760 case ClassFile.TAG_STRING:
761 return getConstantStringValue(cpInfo.constantValue().toString());
762 default:
763 return constantWriter.stringValue(cpInfo);
764 }
765 }
766
767 private String getConstantCharValue(char c) {
768 StringBuilder sb = new StringBuilder();
769 sb.append('\'');
770 sb.append(esc(c, '\''));
771 sb.append('\'');
772 return sb.toString();
773 }
774
775 private String getConstantStringValue(String s) {
776 StringBuilder sb = new StringBuilder();
777 sb.append("\"");
778 for (int i = 0; i < s.length(); i++) {
779 sb.append(esc(s.charAt(i), '"'));
780 }
781 sb.append("\"");
782 return sb.toString();
783 }
784
785 private String esc(char c, char quote) {
786 if (32 <= c && c <= 126 && c != quote && c != '\\')
787 return String.valueOf(c);
788 else switch (c) {
789 case '\b': return "\\b";
790 case '\n': return "\\n";
791 case '\t': return "\\t";
792 case '\f': return "\\f";
793 case '\r': return "\\r";
794 case '\\': return "\\\\";
795 case '\'': return "\\'";
796 case '\"': return "\\\"";
797 default: return String.format("\\u%04x", (int) c);
798 }
799 }
800
801 private Set<String> getClassModifiers(AccessFlags flags) {
802 var flagSet = flagsReportUnknown(flags);
803 Set<AccessFlag> set;
804 if (flagSet.contains(AccessFlag.INTERFACE)) {
805 set = EnumSet.copyOf(flagSet);
806 set.remove(AccessFlag.ABSTRACT);
807 } else {
808 set = flagSet;
809 }
810 return getModifiers(set);
811 }
812
813 private static Set<String> getClassModifiers(AccessFlags flags, int majorVersion, int minorVersion) {
814 boolean previewClassFile = minorVersion == ClassFile.PREVIEW_MINOR_VERSION;
815 Set<AccessFlag> flagSet = flags.flags();
816 if (flagSet.contains(AccessFlag.INTERFACE)) {
817 flagSet = EnumSet.copyOf(flagSet);
818 flagSet.remove(AccessFlag.ABSTRACT);
819 } else if (Source.isSupported(Source.Feature.VALUE_CLASSES, majorVersion) && previewClassFile) {
820 Set<String> classModifers = getModifiers(flagSet);
821 classModifers.add("value");
822 return classModifers;
823 }
824 return getModifiers(flagSet);
825 }
826
827 private static Set<String> getModifiers(Set<java.lang.reflect.AccessFlag> flags) {
828 Set<String> s = new LinkedHashSet<>();
829 for (var f : flags)
830 if (f.sourceModifier()) s.add(Modifier.toString(f.mask()));
831 return s;
832 }
833
834 private Set<String> getClassFlags(AccessFlags flags) {
835 return getFlags(flags.flagsMask(), flagsReportUnknown(flags));
836 }
837
838 private static Set<String> getFlags(int mask, Set<java.lang.reflect.AccessFlag> flags) {
839 Set<String> s = new LinkedHashSet<>();
840 for (var f: flags) {
841 s.add("ACC_" + f.name());
842 mask = mask & ~f.mask();
843 }
844 while (mask != 0) {
845 int bit = Integer.highestOneBit(mask);
846 s.add("0x" + Integer.toHexString(bit));
847 mask = mask & ~bit;
848 }
849 return s;
850 }
851
852 private final Options options;
853 private final AttributeWriter attrWriter;
854 private final CodeWriter codeWriter;
855 private final ConstantWriter constantWriter;
856 private ClassModel classModel;
857 private URI uri;
858 private long lastModified;
859 private String digestName;
860 private byte[] digest;
861 private int size;
862 private MethodModel method;
863 }