Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javap/ConstantWriter.java@961dc3acdb06
src/share/classes/com/sun/tools/javap/ConstantWriter.java
Sat, 08 Aug 2009 17:56:37 -0700
- author
- jjg
- date
- Sat, 08 Aug 2009 17:56:37 -0700
- changeset 355
- 961dc3acdb06
- parent 354
- cba827f72977
- child 554
- 9d9f26857129
- permissions
- -rw-r--r--
6868539: javap should use current names for constant pool tags
Reviewed-by: ksrini
1 /*
2 * Copyright 2007-2008 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
26 package com.sun.tools.javap;
28 import com.sun.tools.classfile.ClassFile;
29 import com.sun.tools.classfile.ConstantPool;
30 import com.sun.tools.classfile.ConstantPoolException;
32 import static com.sun.tools.classfile.ConstantPool.*;
34 /*
35 * Write a constant pool entry.
36 *
37 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
38 * you write code that depends on this, you do so at your own risk.
39 * This code and its internal interfaces are subject to change or
40 * deletion without notice.</b>
41 */
42 public class ConstantWriter extends BasicWriter {
43 public static ConstantWriter instance(Context context) {
44 ConstantWriter instance = context.get(ConstantWriter.class);
45 if (instance == null)
46 instance = new ConstantWriter(context);
47 return instance;
48 }
50 protected ConstantWriter(Context context) {
51 super(context);
52 context.put(ConstantWriter.class, this);
53 classWriter = ClassWriter.instance(context);
54 options = Options.instance(context);
55 }
57 protected void writeConstantPool() {
58 ConstantPool constant_pool = classWriter.getClassFile().constant_pool;
59 writeConstantPool(constant_pool);
60 }
62 protected void writeConstantPool(ConstantPool constant_pool) {
63 ConstantPool.Visitor<Integer, Void> v = new ConstantPool.Visitor<Integer,Void>() {
64 public Integer visitClass(CONSTANT_Class_info info, Void p) {
65 print("#" + info.name_index);
66 tab();
67 println("// " + stringValue(info));
68 return 1;
69 }
71 public Integer visitDouble(CONSTANT_Double_info info, Void p) {
72 println(stringValue(info));
73 return 2;
74 }
76 public Integer visitFieldref(CONSTANT_Fieldref_info info, Void p) {
77 print("#" + info.class_index + ".#" + info.name_and_type_index);
78 tab();
79 println("// " + stringValue(info));
80 return 1;
81 }
83 public Integer visitFloat(CONSTANT_Float_info info, Void p) {
84 println(stringValue(info));
85 return 1;
86 }
88 public Integer visitInteger(CONSTANT_Integer_info info, Void p) {
89 println(stringValue(info));
90 return 1;
91 }
93 public Integer visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Void p) {
94 print("#" + info.class_index + ".#" + info.name_and_type_index);
95 tab();
96 println("// " + stringValue(info));
97 return 1;
98 }
100 public Integer visitLong(CONSTANT_Long_info info, Void p) {
101 println(stringValue(info));
102 return 2;
103 }
105 public Integer visitNameAndType(CONSTANT_NameAndType_info info, Void p) {
106 print("#" + info.name_index + ":#" + info.type_index);
107 tab();
108 println("// " + stringValue(info));
109 return 1;
110 }
112 public Integer visitMethodref(CONSTANT_Methodref_info info, Void p) {
113 print("#" + info.class_index + ".#" + info.name_and_type_index);
114 tab();
115 println("// " + stringValue(info));
116 return 1;
117 }
119 public Integer visitString(CONSTANT_String_info info, Void p) {
120 print("#" + info.string_index);
121 tab();
122 println("// " + stringValue(info));
123 return 1;
124 }
126 public Integer visitUtf8(CONSTANT_Utf8_info info, Void p) {
127 println(stringValue(info));
128 return 1;
129 }
131 };
132 println("Constant pool:");
133 indent(+1);
134 int width = String.valueOf(constant_pool.size()).length() + 1;
135 int cpx = 1;
136 while (cpx < constant_pool.size()) {
137 print(String.format("%" + width + "s", ("#" + cpx)));
138 try {
139 CPInfo cpInfo = constant_pool.get(cpx);
140 print(String.format(" = %-18s ", cpTagName(cpInfo)));
141 cpx += cpInfo.accept(v, null);
142 } catch (ConstantPool.InvalidIndex ex) {
143 // should not happen
144 }
145 }
146 indent(-1);
147 }
149 protected void write(int cpx) {
150 ClassFile classFile = classWriter.getClassFile();
151 if (cpx == 0) {
152 print("#0");
153 return;
154 }
156 CPInfo cpInfo;
157 try {
158 cpInfo = classFile.constant_pool.get(cpx);
159 } catch (ConstantPoolException e) {
160 print("#" + cpx);
161 return;
162 }
164 int tag = cpInfo.getTag();
165 switch (tag) {
166 case CONSTANT_Methodref:
167 case CONSTANT_InterfaceMethodref:
168 case CONSTANT_Fieldref:
169 // simplify references within this class
170 CPRefInfo ref = (CPRefInfo) cpInfo;
171 try {
172 if (ref.class_index == classFile.this_class)
173 cpInfo = classFile.constant_pool.get(ref.name_and_type_index);
174 } catch (ConstantPool.InvalidIndex e) {
175 // ignore, for now
176 }
177 }
178 print(tagName(tag) + " " + stringValue(cpInfo));
179 }
181 String cpTagName(CPInfo cpInfo) {
182 String n = cpInfo.getClass().getSimpleName();
183 return n.replace("CONSTANT_", "").replace("_info", "");
184 }
186 String tagName(int tag) {
187 switch (tag) {
188 case CONSTANT_Utf8:
189 return "Utf8";
190 case CONSTANT_Integer:
191 return "int";
192 case CONSTANT_Float:
193 return "float";
194 case CONSTANT_Long:
195 return "long";
196 case CONSTANT_Double:
197 return "double";
198 case CONSTANT_Class:
199 return "class";
200 case CONSTANT_String:
201 return "String";
202 case CONSTANT_Fieldref:
203 return "Field";
204 case CONSTANT_Methodref:
205 return "Method";
206 case CONSTANT_InterfaceMethodref:
207 return "InterfaceMethod";
208 case CONSTANT_NameAndType:
209 return "NameAndType";
210 default:
211 return "(unknown tag)";
212 }
213 }
215 String stringValue(int constant_pool_index) {
216 ClassFile classFile = classWriter.getClassFile();
217 try {
218 return stringValue(classFile.constant_pool.get(constant_pool_index));
219 } catch (ConstantPool.InvalidIndex e) {
220 return report(e);
221 }
222 }
224 String stringValue(CPInfo cpInfo) {
225 return stringValueVisitor.visit(cpInfo);
226 }
228 StringValueVisitor stringValueVisitor = new StringValueVisitor();
230 private class StringValueVisitor implements ConstantPool.Visitor<String, Void> {
231 public String visit(CPInfo info) {
232 return info.accept(this, null);
233 }
235 public String visitClass(CONSTANT_Class_info info, Void p) {
236 return getCheckedName(info);
237 }
239 String getCheckedName(CONSTANT_Class_info info) {
240 try {
241 return checkName(info.getName());
242 } catch (ConstantPoolException e) {
243 return report(e);
244 }
245 }
247 public String visitDouble(CONSTANT_Double_info info, Void p) {
248 return info.value + "d";
249 }
251 public String visitFieldref(CONSTANT_Fieldref_info info, Void p) {
252 return visitRef(info, p);
253 }
255 public String visitFloat(CONSTANT_Float_info info, Void p) {
256 return info.value + "f";
257 }
259 public String visitInteger(CONSTANT_Integer_info info, Void p) {
260 return String.valueOf(info.value);
261 }
263 public String visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Void p) {
264 return visitRef(info, p);
265 }
267 public String visitLong(CONSTANT_Long_info info, Void p) {
268 return info.value + "l";
269 }
271 public String visitNameAndType(CONSTANT_NameAndType_info info, Void p) {
272 return getCheckedName(info) + ":" + getType(info);
273 }
275 String getCheckedName(CONSTANT_NameAndType_info info) {
276 try {
277 return checkName(info.getName());
278 } catch (ConstantPoolException e) {
279 return report(e);
280 }
281 }
283 String getType(CONSTANT_NameAndType_info info) {
284 try {
285 return info.getType();
286 } catch (ConstantPoolException e) {
287 return report(e);
288 }
289 }
291 public String visitMethodref(CONSTANT_Methodref_info info, Void p) {
292 return visitRef(info, p);
293 }
295 public String visitString(CONSTANT_String_info info, Void p) {
296 try {
297 ClassFile classFile = classWriter.getClassFile();
298 int string_index = info.string_index;
299 return stringValue(classFile.constant_pool.getUTF8Info(string_index));
300 } catch (ConstantPoolException e) {
301 return report(e);
302 }
303 }
305 public String visitUtf8(CONSTANT_Utf8_info info, Void p) {
306 String s = info.value;
307 StringBuilder sb = new StringBuilder();
308 for (int i = 0; i < s.length(); i++) {
309 char c = s.charAt(i);
310 switch (c) {
311 case '\t':
312 sb.append('\\').append('t');
313 break;
314 case '\n':
315 sb.append('\\').append('n');
316 break;
317 case '\r':
318 sb.append('\\').append('r');
319 break;
320 case '\"':
321 sb.append('\\').append('\"');
322 break;
323 default:
324 sb.append(c);
325 }
326 }
327 return sb.toString();
328 }
330 String visitRef(CPRefInfo info, Void p) {
331 String cn = getCheckedClassName(info);
332 String nat;
333 try {
334 nat = stringValue(info.getNameAndTypeInfo());
335 } catch (ConstantPoolException e) {
336 nat = report(e);
337 }
338 return cn + "." + nat;
339 }
341 String getCheckedClassName(CPRefInfo info) {
342 try {
343 return checkName(info.getClassName());
344 } catch (ConstantPoolException e) {
345 return report(e);
346 }
347 }
348 }
351 /* If name is a valid binary name, return it; otherwise quote it. */
352 private static String checkName(String name) {
353 if (name == null)
354 return "null";
356 int len = name.length();
357 if (len == 0)
358 return "\"\"";
360 int cc = '/';
361 int cp;
362 for (int k = 0; k < len; k += Character.charCount(cp)) {
363 cp = name.codePointAt(k);
364 if ((cc == '/' && !Character.isJavaIdentifierStart(cp))
365 || (cp != '/' && !Character.isJavaIdentifierPart(cp))) {
366 return "\"" + addEscapes(name) + "\"";
367 }
368 cc = cp;
369 }
371 return name;
372 }
374 /* If name requires escapes, put them in, so it can be a string body. */
375 private static String addEscapes(String name) {
376 String esc = "\\\"\n\t";
377 String rep = "\\\"nt";
378 StringBuilder buf = null;
379 int nextk = 0;
380 int len = name.length();
381 for (int k = 0; k < len; k++) {
382 char cp = name.charAt(k);
383 int n = esc.indexOf(cp);
384 if (n >= 0) {
385 if (buf == null)
386 buf = new StringBuilder(len * 2);
387 if (nextk < k)
388 buf.append(name, nextk, k);
389 buf.append('\\');
390 buf.append(rep.charAt(n));
391 nextk = k+1;
392 }
393 }
394 if (buf == null)
395 return name;
396 if (nextk < len)
397 buf.append(name, nextk, len);
398 return buf.toString();
399 }
401 private ClassWriter classWriter;
402 private Options options;
403 }
