1 /*
2 * Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javap;
27
28 import java.net.URI;
29 import java.text.DateFormat;
30 import java.util.Collection;
31 import java.util.Date;
32 import java.util.List;
33
34 import com.sun.tools.classfile.AccessFlags;
35 import com.sun.tools.classfile.Attribute;
36 import com.sun.tools.classfile.Attributes;
37 import com.sun.tools.classfile.ClassFile;
38 import com.sun.tools.classfile.Code_attribute;
39 import com.sun.tools.classfile.ConstantPool;
40 import com.sun.tools.classfile.ConstantPoolException;
41 import com.sun.tools.classfile.ConstantValue_attribute;
42 import com.sun.tools.classfile.Descriptor;
43 import com.sun.tools.classfile.Descriptor.InvalidDescriptor;
44 import com.sun.tools.classfile.Exceptions_attribute;
45 import com.sun.tools.classfile.Field;
46 import com.sun.tools.classfile.Method;
47 import com.sun.tools.classfile.Module_attribute;
48 import com.sun.tools.classfile.Signature;
49 import com.sun.tools.classfile.Signature_attribute;
50 import com.sun.tools.classfile.SourceFile_attribute;
51 import com.sun.tools.classfile.Type;
52 import com.sun.tools.classfile.Type.ArrayType;
53 import com.sun.tools.classfile.Type.ClassSigType;
54 import com.sun.tools.classfile.Type.ClassType;
55 import com.sun.tools.classfile.Type.MethodType;
56 import com.sun.tools.classfile.Type.SimpleType;
57 import com.sun.tools.classfile.Type.TypeParamType;
58 import com.sun.tools.classfile.Type.WildcardType;
59
60 import static com.sun.tools.classfile.AccessFlags.*;
61 import static com.sun.tools.classfile.ConstantPool.CONSTANT_Module;
62 import static com.sun.tools.classfile.ConstantPool.CONSTANT_Package;
63
64 /*
65 * The main javap class to write the contents of a class file as text.
66 *
67 * <p><b>This is NOT part of any supported API.
68 * If you write code that depends on this, you do so at your own risk.
69 * This code and its internal interfaces are subject to change or
70 * deletion without notice.</b>
71 */
72 public class ClassWriter extends BasicWriter {
73 static ClassWriter instance(Context context) {
74 ClassWriter instance = context.get(ClassWriter.class);
75 if (instance == null)
76 instance = new ClassWriter(context);
77 return instance;
78 }
79
80 protected ClassWriter(Context context) {
81 super(context);
82 context.put(ClassWriter.class, this);
83 options = Options.instance(context);
84 attrWriter = AttributeWriter.instance(context);
85 codeWriter = CodeWriter.instance(context);
86 constantWriter = ConstantWriter.instance(context);
87 }
88
89 void setDigest(String name, byte[] digest) {
90 this.digestName = name;
91 this.digest = digest;
92 }
93
94 void setFile(URI uri) {
95 this.uri = uri;
96 }
97
98 void setFileSize(int size) {
99 this.size = size;
100 }
101
102 void setLastModified(long lastModified) {
103 this.lastModified = lastModified;
104 }
105
106 protected ClassFile getClassFile() {
107 return classFile;
108 }
109
110 protected void setClassFile(ClassFile cf) {
111 classFile = cf;
112 constant_pool = classFile.constant_pool;
113 }
114
115 protected Method getMethod() {
116 return method;
117 }
118
119 protected void setMethod(Method m) {
120 method = m;
121 }
122
123 public void write(ClassFile cf) {
124 setClassFile(cf);
125
126 if (options.sysInfo || options.verbose) {
127 if (uri != null) {
128 if (uri.getScheme().equals("file"))
129 println("Classfile " + uri.getPath());
130 else
131 println("Classfile " + uri);
132 }
133 indent(+1);
134 if (lastModified != -1) {
135 Date lm = new Date(lastModified);
136 DateFormat df = DateFormat.getDateInstance();
137 if (size > 0) {
138 println("Last modified " + df.format(lm) + "; size " + size + " bytes");
139 } else {
140 println("Last modified " + df.format(lm));
141 }
142 } else if (size > 0) {
143 println("Size " + size + " bytes");
144 }
145 if (digestName != null && digest != null) {
146 StringBuilder sb = new StringBuilder();
147 for (byte b: digest)
148 sb.append(String.format("%02x", b));
149 println(digestName + " checksum " + sb);
150 }
151 }
152
153 Attribute sfa = cf.getAttribute(Attribute.SourceFile);
154 if (sfa instanceof SourceFile_attribute) {
155 println("Compiled from \"" + getSourceFile((SourceFile_attribute) sfa) + "\"");
156 }
157
158 if (options.sysInfo || options.verbose) {
159 indent(-1);
160 }
161
162 AccessFlags flags = cf.access_flags;
163 writeModifiers(flags.getClassModifiers());
164
165 if (classFile.access_flags.is(AccessFlags.ACC_MODULE)) {
166 Attribute attr = classFile.attributes.get(Attribute.Module);
167 if (attr instanceof Module_attribute) {
168 Module_attribute modAttr = (Module_attribute) attr;
169 String name;
170 try {
171 // FIXME: compatibility code
172 if (constant_pool.get(modAttr.module_name).getTag() == CONSTANT_Module) {
173 name = getJavaName(constant_pool.getModuleInfo(modAttr.module_name).getName());
174 } else {
175 name = getJavaName(constant_pool.getUTF8Value(modAttr.module_name));
176 }
177 } catch (ConstantPoolException e) {
178 name = report(e);
179 }
180 if ((modAttr.module_flags & Module_attribute.ACC_OPEN) != 0) {
181 print("open ");
182 }
183 print("module ");
184 print(name);
185 if (modAttr.module_version_index != 0) {
186 print("@");
187 print(getUTF8Value(modAttr.module_version_index));
188 }
189 } else {
190 // fallback for malformed class files
191 print("class ");
192 print(getJavaName(classFile));
193 }
194 } else {
195 if (classFile.isClass())
196 print("class ");
197 else if (classFile.isInterface())
198 print("interface ");
199
200 print(getJavaName(classFile));
201 }
202
203 Signature_attribute sigAttr = getSignature(cf.attributes);
204 if (sigAttr == null) {
205 // use info from class file header
206 if (classFile.isClass() && classFile.super_class != 0 ) {
207 String sn = getJavaSuperclassName(cf);
208 if (!sn.equals("java.lang.Object")) {
209 print(" extends ");
210 print(sn);
211 }
212 }
213 for (int i = 0; i < classFile.interfaces.length; i++) {
214 print(i == 0 ? (classFile.isClass() ? " implements " : " extends ") : ",");
215 print(getJavaInterfaceName(classFile, i));
216 }
217 } else {
218 try {
219 Type t = sigAttr.getParsedSignature().getType(constant_pool);
220 JavaTypePrinter p = new JavaTypePrinter(classFile.isInterface());
221 // The signature parser cannot disambiguate between a
222 // FieldType and a ClassSignatureType that only contains a superclass type.
223 if (t instanceof Type.ClassSigType) {
224 print(p.print(t));
225 } else if (options.verbose || !t.isObject()) {
226 print(" extends ");
227 print(p.print(t));
228 }
229 } catch (ConstantPoolException e) {
230 print(report(e));
231 }
232 }
233
234 if (options.verbose) {
235 println();
236 indent(+1);
237 println("minor version: " + cf.minor_version);
238 println("major version: " + cf.major_version);
239 writeList(String.format("flags: (0x%04x) ", flags.flags), flags.getClassFlags(), "\n");
240 print("this_class: #" + cf.this_class);
241 if (cf.this_class != 0) {
242 tab();
243 print("// " + constantWriter.stringValue(cf.this_class));
244 }
245 println();
246 print("super_class: #" + cf.super_class);
247 if (cf.super_class != 0) {
248 tab();
249 print("// " + constantWriter.stringValue(cf.super_class));
250 }
251 println();
252 print("interfaces: " + cf.interfaces.length);
253 print(", fields: " + cf.fields.length);
254 print(", methods: " + cf.methods.length);
255 println(", attributes: " + cf.attributes.attrs.length);
256 indent(-1);
257 constantWriter.writeConstantPool();
258 } else {
259 print(" ");
260 }
261
262 println("{");
263 indent(+1);
264 if (flags.is(AccessFlags.ACC_MODULE) && !options.verbose) {
265 writeDirectives();
266 }
267 writeFields();
268 writeMethods();
269 indent(-1);
270 println("}");
271
272 if (options.verbose) {
273 attrWriter.write(cf, cf.attributes, constant_pool);
274 }
275 }
276 // where
277 class JavaTypePrinter implements Type.Visitor<StringBuilder,StringBuilder> {
278 boolean isInterface;
279
280 JavaTypePrinter(boolean isInterface) {
281 this.isInterface = isInterface;
282 }
283
284 String print(Type t) {
285 return t.accept(this, new StringBuilder()).toString();
286 }
287
288 String printTypeArgs(List<? extends TypeParamType> typeParamTypes) {
289 StringBuilder builder = new StringBuilder();
290 appendIfNotEmpty(builder, "<", typeParamTypes, "> ");
291 return builder.toString();
292 }
293
294 @Override
295 public StringBuilder visitSimpleType(SimpleType type, StringBuilder sb) {
296 sb.append(getJavaName(type.name));
297 return sb;
298 }
299
300 @Override
301 public StringBuilder visitArrayType(ArrayType type, StringBuilder sb) {
302 append(sb, type.elemType);
303 sb.append("[]");
304 return sb;
305 }
306
307 @Override
308 public StringBuilder visitMethodType(MethodType type, StringBuilder sb) {
309 appendIfNotEmpty(sb, "<", type.typeParamTypes, "> ");
310 append(sb, type.returnType);
311 append(sb, " (", type.paramTypes, ")");
312 appendIfNotEmpty(sb, " throws ", type.throwsTypes, "");
313 return sb;
314 }
315
316 @Override
317 public StringBuilder visitClassSigType(ClassSigType type, StringBuilder sb) {
318 appendIfNotEmpty(sb, "<", type.typeParamTypes, ">");
319 if (isInterface) {
320 appendIfNotEmpty(sb, " extends ", type.superinterfaceTypes, "");
321 } else {
322 if (type.superclassType != null
323 && (options.verbose || !type.superclassType.isObject())) {
324 sb.append(" extends ");
325 append(sb, type.superclassType);
326 }
327 appendIfNotEmpty(sb, " implements ", type.superinterfaceTypes, "");
328 }
329 return sb;
330 }
331
332 @Override
333 public StringBuilder visitClassType(ClassType type, StringBuilder sb) {
334 if (type.outerType != null) {
335 append(sb, type.outerType);
336 sb.append(".");
337 }
338 sb.append(getJavaName(type.name));
339 appendIfNotEmpty(sb, "<", type.typeArgs, ">");
340 return sb;
341 }
342
343 @Override
344 public StringBuilder visitTypeParamType(TypeParamType type, StringBuilder sb) {
345 sb.append(type.name);
346 String sep = " extends ";
347 if (type.classBound != null
348 && (options.verbose || !type.classBound.isObject())) {
349 sb.append(sep);
350 append(sb, type.classBound);
351 sep = " & ";
352 }
353 if (type.interfaceBounds != null) {
354 for (Type bound: type.interfaceBounds) {
355 sb.append(sep);
356 append(sb, bound);
357 sep = " & ";
358 }
359 }
360 return sb;
361 }
362
363 @Override
364 public StringBuilder visitWildcardType(WildcardType type, StringBuilder sb) {
365 switch (type.kind) {
366 case UNBOUNDED:
367 sb.append("?");
368 break;
369 case EXTENDS:
370 sb.append("? extends ");
371 append(sb, type.boundType);
372 break;
373 case SUPER:
374 sb.append("? super ");
375 append(sb, type.boundType);
376 break;
377 default:
378 throw new AssertionError();
379 }
380 return sb;
381 }
382
383 private void append(StringBuilder sb, Type t) {
384 t.accept(this, sb);
385 }
386
387 private void append(StringBuilder sb, String prefix, List<? extends Type> list, String suffix) {
388 sb.append(prefix);
389 String sep = "";
390 for (Type t: list) {
391 sb.append(sep);
392 append(sb, t);
393 sep = ", ";
394 }
395 sb.append(suffix);
396 }
397
398 private void appendIfNotEmpty(StringBuilder sb, String prefix, List<? extends Type> list, String suffix) {
399 if (!isEmpty(list))
400 append(sb, prefix, list, suffix);
401 }
402
403 private boolean isEmpty(List<? extends Type> list) {
404 return (list == null || list.isEmpty());
405 }
406 }
407
408 protected void writeFields() {
409 for (Field f: classFile.fields) {
410 writeField(f);
411 }
412 }
413
414 protected void writeField(Field f) {
415 if (!options.checkAccess(f.access_flags))
416 return;
417
418 AccessFlags flags = f.access_flags;
419 writeModifiers(flags.getFieldModifiers());
420 Signature_attribute sigAttr = getSignature(f.attributes);
421 if (sigAttr == null)
422 print(getJavaFieldType(f.descriptor));
423 else {
424 try {
425 Type t = sigAttr.getParsedSignature().getType(constant_pool);
426 print(getJavaName(t.toString()));
427 } catch (ConstantPoolException e) {
428 // report error?
429 // fall back on non-generic descriptor
430 print(getJavaFieldType(f.descriptor));
431 }
432 }
433 print(" ");
434 print(getFieldName(f));
435 if (options.showConstants) {
436 Attribute a = f.attributes.get(Attribute.ConstantValue);
437 if (a instanceof ConstantValue_attribute) {
438 print(" = ");
439 ConstantValue_attribute cv = (ConstantValue_attribute) a;
440 print(getConstantValue(f.descriptor, cv.constantvalue_index));
441 }
442 }
443 print(";");
444 println();
445
446 indent(+1);
447
448 boolean showBlank = false;
449
450 if (options.showDescriptors)
451 println("descriptor: " + getValue(f.descriptor));
452
453 if (options.verbose)
454 writeList(String.format("flags: (0x%04x) ", flags.flags), flags.getFieldFlags(), "\n");
455
456 if (options.showAllAttrs) {
457 for (Attribute attr: f.attributes)
458 attrWriter.write(f, attr, constant_pool);
459 showBlank = true;
460 }
461
462 indent(-1);
463
464 if (showBlank || options.showDisassembled || options.showLineAndLocalVariableTables)
465 println();
466 }
467
468 protected void writeMethods() {
469 for (Method m: classFile.methods)
470 writeMethod(m);
471 setPendingNewline(false);
472 }
473
474 protected void writeMethod(Method m) {
475 if (!options.checkAccess(m.access_flags))
476 return;
477
478 method = m;
479
480 AccessFlags flags = m.access_flags;
481
482 Descriptor d;
483 Type.MethodType methodType;
484 List<? extends Type> methodExceptions;
485
486 Signature_attribute sigAttr = getSignature(m.attributes);
487 if (sigAttr == null) {
488 d = m.descriptor;
489 methodType = null;
490 methodExceptions = null;
491 } else {
492 Signature methodSig = sigAttr.getParsedSignature();
493 d = methodSig;
494 try {
495 methodType = (Type.MethodType) methodSig.getType(constant_pool);
496 methodExceptions = methodType.throwsTypes;
497 if (methodExceptions != null && methodExceptions.isEmpty())
498 methodExceptions = null;
499 } catch (ConstantPoolException e) {
500 // report error?
501 // fall back on standard descriptor
502 methodType = null;
503 methodExceptions = null;
504 }
505 }
506
507 writeModifiers(flags.getMethodModifiers());
508 if (methodType != null) {
509 print(new JavaTypePrinter(false).printTypeArgs(methodType.typeParamTypes));
510 }
511 switch (getName(m)) {
512 case "<init>":
513 print(getJavaName(classFile));
514 print(getJavaParameterTypes(d, flags));
515 break;
516 case "<clinit>":
517 print("{}");
518 break;
519 default:
520 print(getJavaReturnType(d));
521 print(" ");
522 print(getName(m));
523 print(getJavaParameterTypes(d, flags));
524 break;
525 }
526
527 Attribute e_attr = m.attributes.get(Attribute.Exceptions);
528 if (e_attr != null) { // if there are generic exceptions, there must be erased exceptions
529 if (e_attr instanceof Exceptions_attribute) {
530 Exceptions_attribute exceptions = (Exceptions_attribute) e_attr;
531 print(" throws ");
532 if (methodExceptions != null) { // use generic list if available
533 writeList("", methodExceptions, "");
534 } else {
535 for (int i = 0; i < exceptions.number_of_exceptions; i++) {
536 if (i > 0)
537 print(", ");
538 print(getJavaException(exceptions, i));
539 }
540 }
541 } else {
542 report("Unexpected or invalid value for Exceptions attribute");
543 }
544 }
545
546 println(";");
547
548 indent(+1);
549
550 if (options.showDescriptors) {
551 println("descriptor: " + getValue(m.descriptor));
552 }
553
554 if (options.verbose) {
555 writeList(String.format("flags: (0x%04x) ", flags.flags), flags.getMethodFlags(), "\n");
556 }
557
558 Code_attribute code = null;
559 Attribute c_attr = m.attributes.get(Attribute.Code);
560 if (c_attr != null) {
561 if (c_attr instanceof Code_attribute)
562 code = (Code_attribute) c_attr;
563 else
564 report("Unexpected or invalid value for Code attribute");
565 }
566
567 if (options.showAllAttrs) {
568 Attribute[] attrs = m.attributes.attrs;
569 for (Attribute attr: attrs)
570 attrWriter.write(m, attr, constant_pool);
571 } else if (code != null) {
572 if (options.showDisassembled) {
573 println("Code:");
574 codeWriter.writeInstrs(code);
575 codeWriter.writeExceptionTable(code);
576 }
577
578 if (options.showLineAndLocalVariableTables) {
579 attrWriter.write(code, code.attributes.get(Attribute.LineNumberTable), constant_pool);
580 attrWriter.write(code, code.attributes.get(Attribute.LocalVariableTable), constant_pool);
581 }
582 }
583
584 indent(-1);
585
586 // set pendingNewline to write a newline before the next method (if any)
587 // if a separator is desired
588 setPendingNewline(
589 options.showDisassembled ||
590 options.showAllAttrs ||
591 options.showDescriptors ||
592 options.showLineAndLocalVariableTables ||
593 options.verbose);
594 }
595
596 void writeModifiers(Collection<String> items) {
597 for (Object item: items) {
598 print(item);
599 print(" ");
600 }
601 }
602
603 void writeDirectives() {
604 Attribute attr = classFile.attributes.get(Attribute.Module);
605 if (!(attr instanceof Module_attribute))
606 return;
607
608 Module_attribute m = (Module_attribute) attr;
609 for (Module_attribute.RequiresEntry entry: m.requires) {
610 print("requires");
611 if ((entry.requires_flags & Module_attribute.ACC_STATIC_PHASE) != 0)
612 print(" static");
613 if ((entry.requires_flags & Module_attribute.ACC_TRANSITIVE) != 0)
614 print(" transitive");
615 print(" ");
616 String mname;
617 try {
618 mname = getModuleName(entry.requires_index);
619 } catch (ConstantPoolException e) {
620 mname = report(e);
621 }
622 print(mname);
623 println(";");
624 }
625
626 for (Module_attribute.ExportsEntry entry: m.exports) {
627 print("exports");
628 print(" ");
629 String pname;
630 try {
631 pname = getPackageName(entry.exports_index).replace('/', '.');
632 } catch (ConstantPoolException e) {
633 pname = report(e);
634 }
635 print(pname);
636 boolean first = true;
637 for (int i: entry.exports_to_index) {
638 String mname;
639 try {
640 mname = getModuleName(i);
641 } catch (ConstantPoolException e) {
642 mname = report(e);
643 }
644 if (first) {
645 println(" to");
646 indent(+1);
647 first = false;
648 } else {
649 println(",");
650 }
651 print(mname);
652 }
653 println(";");
654 if (!first)
655 indent(-1);
656 }
657
658 for (Module_attribute.OpensEntry entry: m.opens) {
659 print("opens");
660 print(" ");
661 String pname;
662 try {
663 pname = getPackageName(entry.opens_index).replace('/', '.');
664 } catch (ConstantPoolException e) {
665 pname = report(e);
666 }
667 print(pname);
668 boolean first = true;
669 for (int i: entry.opens_to_index) {
670 String mname;
671 try {
672 mname = getModuleName(i);
673 } catch (ConstantPoolException e) {
674 mname = report(e);
675 }
676 if (first) {
677 println(" to");
678 indent(+1);
679 first = false;
680 } else {
681 println(",");
682 }
683 print(mname);
684 }
685 println(";");
686 if (!first)
687 indent(-1);
688 }
689
690 for (int entry: m.uses_index) {
691 print("uses ");
692 print(getClassName(entry).replace('/', '.'));
693 println(";");
694 }
695
696 for (Module_attribute.ProvidesEntry entry: m.provides) {
697 print("provides ");
698 print(getClassName(entry.provides_index).replace('/', '.'));
699 boolean first = true;
700 for (int i: entry.with_index) {
701 if (first) {
702 println(" with");
703 indent(+1);
704 first = false;
705 } else {
706 println(",");
707 }
708 print(getClassName(i).replace('/', '.'));
709 }
710 println(";");
711 if (!first)
712 indent(-1);
713 }
714 }
715
716 String getModuleName(int index) throws ConstantPoolException {
717 if (constant_pool.get(index).getTag() == CONSTANT_Module) {
718 return constant_pool.getModuleInfo(index).getName();
719 } else {
720 return constant_pool.getUTF8Value(index);
721 }
722 }
723
724 String getPackageName(int index) throws ConstantPoolException {
725 if (constant_pool.get(index).getTag() == CONSTANT_Package) {
726 return constant_pool.getPackageInfo(index).getName();
727 } else {
728 return constant_pool.getUTF8Value(index);
729 }
730 }
731
732 String getUTF8Value(int index) {
733 try {
734 return classFile.constant_pool.getUTF8Value(index);
735 } catch (ConstantPoolException e) {
736 return report(e);
737 }
738 }
739
740 String getClassName(int index) {
741 try {
742 return classFile.constant_pool.getClassInfo(index).getName();
743 } catch (ConstantPoolException e) {
744 return report(e);
745 }
746 }
747
748 void writeList(String prefix, Collection<?> items, String suffix) {
749 print(prefix);
750 String sep = "";
751 for (Object item: items) {
752 print(sep);
753 print(item);
754 sep = ", ";
755 }
756 print(suffix);
757 }
758
759 void writeListIfNotEmpty(String prefix, List<?> items, String suffix) {
760 if (items != null && items.size() > 0)
761 writeList(prefix, items, suffix);
762 }
763
764 Signature_attribute getSignature(Attributes attributes) {
765 return (Signature_attribute) attributes.get(Attribute.Signature);
766 }
767
768 String adjustVarargs(AccessFlags flags, String params) {
769 if (flags.is(ACC_VARARGS)) {
770 int i = params.lastIndexOf("[]");
771 if (i > 0)
772 return params.substring(0, i) + "..." + params.substring(i+2);
773 }
774
775 return params;
776 }
777
778 String getJavaName(ClassFile cf) {
779 try {
780 return getJavaName(cf.getName());
781 } catch (ConstantPoolException e) {
782 return report(e);
783 }
784 }
785
786 String getJavaSuperclassName(ClassFile cf) {
787 try {
788 return getJavaName(cf.getSuperclassName());
789 } catch (ConstantPoolException e) {
790 return report(e);
791 }
792 }
793
794 String getJavaInterfaceName(ClassFile cf, int index) {
795 try {
796 return getJavaName(cf.getInterfaceName(index));
797 } catch (ConstantPoolException e) {
798 return report(e);
799 }
800 }
801
802 String getJavaFieldType(Descriptor d) {
803 try {
804 return getJavaName(d.getFieldType(constant_pool));
805 } catch (ConstantPoolException e) {
806 return report(e);
807 } catch (InvalidDescriptor e) {
808 return report(e);
809 }
810 }
811
812 String getJavaReturnType(Descriptor d) {
813 try {
814 return getJavaName(d.getReturnType(constant_pool));
815 } catch (ConstantPoolException e) {
816 return report(e);
817 } catch (InvalidDescriptor e) {
818 return report(e);
819 }
820 }
821
822 String getJavaParameterTypes(Descriptor d, AccessFlags flags) {
823 try {
824 return getJavaName(adjustVarargs(flags, d.getParameterTypes(constant_pool)));
825 } catch (ConstantPoolException e) {
826 return report(e);
827 } catch (InvalidDescriptor e) {
828 return report(e);
829 }
830 }
831
832 String getJavaException(Exceptions_attribute attr, int index) {
833 try {
834 return getJavaName(attr.getException(index, constant_pool));
835 } catch (ConstantPoolException e) {
836 return report(e);
837 }
838 }
839
840 String getValue(Descriptor d) {
841 try {
842 return d.getValue(constant_pool);
843 } catch (ConstantPoolException e) {
844 return report(e);
845 }
846 }
847
848 String getFieldName(Field f) {
849 try {
850 return f.getName(constant_pool);
851 } catch (ConstantPoolException e) {
852 return report(e);
853 }
854 }
855
856 String getName(Method m) {
857 try {
858 return m.getName(constant_pool);
859 } catch (ConstantPoolException e) {
860 return report(e);
861 }
862 }
863
864 static String getJavaName(String name) {
865 return name.replace('/', '.');
866 }
867
868 String getSourceFile(SourceFile_attribute attr) {
869 try {
870 return attr.getSourceFile(constant_pool);
871 } catch (ConstantPoolException e) {
872 return report(e);
873 }
874 }
875
876 /**
877 * Get the value of an entry in the constant pool as a Java constant.
878 * Characters and booleans are represented by CONSTANT_Intgere entries.
879 * Character and string values are processed to escape characters outside
880 * the basic printable ASCII set.
881 * @param d the descriptor, giving the expected type of the constant
882 * @param index the index of the value in the constant pool
883 * @return a printable string containing the value of the constant.
884 */
885 String getConstantValue(Descriptor d, int index) {
886 try {
887 ConstantPool.CPInfo cpInfo = constant_pool.get(index);
888
889 switch (cpInfo.getTag()) {
890 case ConstantPool.CONSTANT_Integer: {
891 ConstantPool.CONSTANT_Integer_info info =
892 (ConstantPool.CONSTANT_Integer_info) cpInfo;
893 String t = d.getValue(constant_pool);
894 switch (t) {
895 case "C":
896 // character
897 return getConstantCharValue((char) info.value);
898 case "Z":
899 // boolean
900 return String.valueOf(info.value == 1);
901 default:
902 // other: assume integer
903 return String.valueOf(info.value);
904 }
905 }
906
907 case ConstantPool.CONSTANT_String: {
908 ConstantPool.CONSTANT_String_info info =
909 (ConstantPool.CONSTANT_String_info) cpInfo;
910 return getConstantStringValue(info.getString());
911 }
912
913 default:
914 return constantWriter.stringValue(cpInfo);
915 }
916 } catch (ConstantPoolException e) {
917 return "#" + index;
918 }
919 }
920
921 private String getConstantCharValue(char c) {
922 StringBuilder sb = new StringBuilder();
923 sb.append('\'');
924 sb.append(esc(c, '\''));
925 sb.append('\'');
926 return sb.toString();
927 }
928
929 private String getConstantStringValue(String s) {
930 StringBuilder sb = new StringBuilder();
931 sb.append("\"");
932 for (int i = 0; i < s.length(); i++) {
933 sb.append(esc(s.charAt(i), '"'));
934 }
935 sb.append("\"");
936 return sb.toString();
937 }
938
939 private String esc(char c, char quote) {
940 if (32 <= c && c <= 126 && c != quote && c != '\\')
941 return String.valueOf(c);
942 else switch (c) {
943 case '\b': return "\\b";
944 case '\n': return "\\n";
945 case '\t': return "\\t";
946 case '\f': return "\\f";
947 case '\r': return "\\r";
948 case '\\': return "\\\\";
949 case '\'': return "\\'";
950 case '\"': return "\\\"";
951 default: return String.format("\\u%04x", (int) c);
952 }
953 }
954
955 private final Options options;
956 private final AttributeWriter attrWriter;
957 private final CodeWriter codeWriter;
958 private final ConstantWriter constantWriter;
959 private ClassFile classFile;
960 private URI uri;
961 private long lastModified;
962 private String digestName;
963 private byte[] digest;
964 private int size;
965 private ConstantPool constant_pool;
966 private Method method;
967 }