History

My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

Showing the changes to java/pkg/sun/invoke/anon/ConstantPoolParser.java (1 of 18352 files). Show all

Unified · Split

java/pkg/sun/invoke/anon/ConstantPoolParser.java+368−0
@@ -0,0 +1,368 @@
1+/*
2+ * Copyright (c) 2008, 2011, 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 sun.invoke.anon;
27+
28+import java.io.IOException;
29+import java.io.OutputStream;
30+import java.nio.BufferUnderflowException;
31+import java.nio.ByteBuffer;
32+
33+import static sun.invoke.anon.ConstantPoolVisitor.*;
34+
35+/** A constant pool parser.
36+ */
37+public class ConstantPoolParser {
38+ final byte[] classFile;
39+ final byte[] tags;
40+ final char[] firstHeader; // maghi, maglo, minor, major, cplen
41+
42+ // these are filled in on first parse:
43+ int endOffset;
44+ char[] secondHeader; // flags, this_class, super_class, intlen
45+
46+ // used to decode UTF8 array
47+ private char[] charArray = new char[80];
48+
49+ /** Creates a constant pool parser.
50+ * @param classFile an array of bytes containing a class.
51+ * @throws InvalidConstantPoolFormatException if the header of the class has errors.
52+ */
53+ public ConstantPoolParser(byte[] classFile) throws InvalidConstantPoolFormatException {
54+ this.classFile = classFile;
55+ this.firstHeader = parseHeader(classFile);
56+ this.tags = new byte[firstHeader[4]];
57+ }
58+
59+ /** Create a constant pool parser by loading the bytecodes of the
60+ * class taken as argument.
61+ *
62+ * @param templateClass the class to parse.
63+ *
64+ * @throws IOException raised if an I/O occurs when loading
65+ * the bytecode of the template class.
66+ * @throws InvalidConstantPoolFormatException if the header of the class has errors.
67+ *
68+ * @see #ConstantPoolParser(byte[])
69+ * @see AnonymousClassLoader#readClassFile(Class)
70+ */
71+ public ConstantPoolParser(Class<?> templateClass) throws IOException, InvalidConstantPoolFormatException {
72+ this(AnonymousClassLoader.readClassFile(templateClass));
73+ }
74+
75+ /** Creates an empty patch to patch the class file
76+ * used by the current parser.
77+ * @return a new class patch.
78+ */
79+ public ConstantPoolPatch createPatch() {
80+ return new ConstantPoolPatch(this);
81+ }
82+
83+ /** Report the tag of the indicated CP entry.
84+ * @param index
85+ * @return one of {@link ConstantPoolVisitor#CONSTANT_Utf8}, etc.
86+ */
87+ public byte getTag(int index) {
88+ getEndOffset(); // trigger an exception if we haven't parsed yet
89+ return tags[index];
90+ }
91+
92+ /** Report the length of the constant pool. */
93+ public int getLength() {
94+ return firstHeader[4];
95+ }
96+
97+ /** Report the offset, within the class file, of the start of the constant pool. */
98+ public int getStartOffset() {
99+ return firstHeader.length * 2;
100+ }
101+
102+ /** Report the offset, within the class file, of the end of the constant pool. */
103+ public int getEndOffset() {
104+ if (endOffset == 0)
105+ throw new IllegalStateException("class file has not yet been parsed");
106+ return endOffset;
107+ }
108+
109+ /** Report the CP index of this class's own name. */
110+ public int getThisClassIndex() {
111+ getEndOffset(); // provoke exception if not yet parsed
112+ return secondHeader[1];
113+ }
114+
115+ /** Report the total size of the class file. */
116+ public int getTailLength() {
117+ return classFile.length - getEndOffset();
118+ }
119+
120+ /** Write the head (header plus constant pool)
121+ * of the class file to the indicated stream.
122+ */
123+ public void writeHead(OutputStream out) throws IOException {
124+ out.write(classFile, 0, getEndOffset());
125+ }
126+
127+ /** Write the head (header plus constant pool)
128+ * of the class file to the indicated stream,
129+ * incorporating the non-null entries of the given array
130+ * as patches.
131+ */
132+ void writePatchedHead(OutputStream out, Object[] patchArray) {
133+ // this will be useful to partially emulate the class loader on old JVMs
134+ throw new UnsupportedOperationException("Not yet implemented");
135+ }
136+
137+ /** Write the tail (everything after the constant pool)
138+ * of the class file to the indicated stream.
139+ */
140+ public void writeTail(OutputStream out) throws IOException {
141+ out.write(classFile, getEndOffset(), getTailLength());
142+ }
143+
144+ private static char[] parseHeader(byte[] classFile) throws InvalidConstantPoolFormatException {
145+ char[] result = new char[5];
146+ ByteBuffer buffer = ByteBuffer.wrap(classFile);
147+ for (int i = 0; i < result.length; i++)
148+ result[i] = (char) getUnsignedShort(buffer);
149+ int magic = result[0] << 16 | result[1] << 0;
150+ if (magic != 0xCAFEBABE)
151+ throw new InvalidConstantPoolFormatException("invalid magic number "+magic);
152+ // skip major, minor version
153+ int len = result[4];
154+ if (len < 1)
155+ throw new InvalidConstantPoolFormatException("constant pool length < 1");
156+ return result;
157+ }
158+
159+ /** Parse the constant pool of the class
160+ * calling a method visit* each time a constant pool entry is parsed.
161+ *
162+ * The order of the calls to visit* is not guaranteed to be the same
163+ * than the order of the constant pool entry in the bytecode array.
164+ *
165+ * @param visitor
166+ * @throws InvalidConstantPoolFormatException
167+ */
168+ public void parse(ConstantPoolVisitor visitor) throws InvalidConstantPoolFormatException {
169+ ByteBuffer buffer = ByteBuffer.wrap(classFile);
170+ buffer.position(getStartOffset()); //skip header
171+
172+ Object[] values = new Object[getLength()];
173+ try {
174+ parseConstantPool(buffer, values, visitor);
175+ } catch(BufferUnderflowException e) {
176+ throw new InvalidConstantPoolFormatException(e);
177+ }
178+ if (endOffset == 0) {
179+ endOffset = buffer.position();
180+ secondHeader = new char[4];
181+ for (int i = 0; i < secondHeader.length; i++) {
182+ secondHeader[i] = (char) getUnsignedShort(buffer);
183+ }
184+ }
185+ resolveConstantPool(values, visitor);
186+ }
187+
188+ private char[] getCharArray(int utfLength) {
189+ if (utfLength <= charArray.length)
190+ return charArray;
191+ return charArray = new char[utfLength];
192+ }
193+
194+ private void parseConstantPool(ByteBuffer buffer, Object[] values, ConstantPoolVisitor visitor) throws InvalidConstantPoolFormatException {
195+ for (int i = 1; i < tags.length; ) {
196+ byte tag = (byte) getUnsignedByte(buffer);
197+ assert(tags[i] == 0 || tags[i] == tag);
198+ tags[i] = tag;
199+ switch (tag) {
200+ case CONSTANT_Utf8:
201+ int utfLen = getUnsignedShort(buffer);
202+ String value = getUTF8(buffer, utfLen, getCharArray(utfLen));
203+ visitor.visitUTF8(i, CONSTANT_Utf8, value);
204+ tags[i] = tag;
205+ values[i++] = value;
206+ break;
207+ case CONSTANT_Integer:
208+ visitor.visitConstantValue(i, tag, buffer.getInt());
209+ i++;
210+ break;
211+ case CONSTANT_Float:
212+ visitor.visitConstantValue(i, tag, buffer.getFloat());
213+ i++;
214+ break;
215+ case CONSTANT_Long:
216+ visitor.visitConstantValue(i, tag, buffer.getLong());
217+ i+=2;
218+ break;
219+ case CONSTANT_Double:
220+ visitor.visitConstantValue(i, tag, buffer.getDouble());
221+ i+=2;
222+ break;
223+
224+ case CONSTANT_Class: // fall through:
225+ case CONSTANT_String:
226+ tags[i] = tag;
227+ values[i++] = new int[] { getUnsignedShort(buffer) };
228+ break;
229+
230+ case CONSTANT_Fieldref: // fall through:
231+ case CONSTANT_Methodref: // fall through:
232+ case CONSTANT_InterfaceMethodref: // fall through:
233+ case CONSTANT_NameAndType:
234+ tags[i] = tag;
235+ values[i++] = new int[] { getUnsignedShort(buffer), getUnsignedShort(buffer) };
236+ break;
237+ default:
238+ throw new AssertionError("invalid constant "+tag);
239+ }
240+ }
241+ }
242+
243+ private void resolveConstantPool(Object[] values, ConstantPoolVisitor visitor) {
244+ // clean out the int[] values, which are temporary
245+ for (int beg = 1, end = values.length-1, beg2, end2;
246+ beg <= end;
247+ beg = beg2, end = end2) {
248+ beg2 = end; end2 = beg-1;
249+ //System.out.println("CP resolve pass: "+beg+".."+end);
250+ for (int i = beg; i <= end; i++) {
251+ Object value = values[i];
252+ if (!(value instanceof int[]))
253+ continue;
254+ int[] array = (int[]) value;
255+ byte tag = tags[i];
256+ switch (tag) {
257+ case CONSTANT_String:
258+ String stringBody = (String) values[array[0]];
259+ visitor.visitConstantString(i, tag, stringBody, array[0]);
260+ values[i] = null;
261+ break;
262+ case CONSTANT_Class: {
263+ String className = (String) values[array[0]];
264+ // use the external form favored by Class.forName:
265+ className = className.replace('/', '.');
266+ visitor.visitConstantString(i, tag, className, array[0]);
267+ values[i] = className;
268+ break;
269+ }
270+ case CONSTANT_NameAndType: {
271+ String memberName = (String) values[array[0]];
272+ String signature = (String) values[array[1]];
273+ visitor.visitDescriptor(i, tag, memberName, signature,
274+ array[0], array[1]);
275+ values[i] = new String[] {memberName, signature};
276+ break;
277+ }
278+ case CONSTANT_Fieldref: // fall through:
279+ case CONSTANT_Methodref: // fall through:
280+ case CONSTANT_InterfaceMethodref: {
281+ Object className = values[array[0]];
282+ Object nameAndType = values[array[1]];
283+ if (!(className instanceof String) ||
284+ !(nameAndType instanceof String[])) {
285+ // one more pass is needed
286+ if (beg2 > i) beg2 = i;
287+ if (end2 < i) end2 = i;
288+ continue;
289+ }
290+ String[] nameAndTypeArray = (String[]) nameAndType;
291+ visitor.visitMemberRef(i, tag,
292+ (String)className,
293+ nameAndTypeArray[0],
294+ nameAndTypeArray[1],
295+ array[0], array[1]);
296+ values[i] = null;
297+ }
298+ break;
299+ default:
300+ continue;
301+ }
302+ }
303+ }
304+ }
305+
306+ private static int getUnsignedByte(ByteBuffer buffer) {
307+ return buffer.get() & 0xFF;
308+ }
309+
310+ private static int getUnsignedShort(ByteBuffer buffer) {
311+ int b1 = getUnsignedByte(buffer);
312+ int b2 = getUnsignedByte(buffer);
313+ return (b1 << 8) + (b2 << 0);
314+ }
315+
316+ private static String getUTF8(ByteBuffer buffer, int utfLen, char[] charArray) throws InvalidConstantPoolFormatException {
317+ int utfLimit = buffer.position() + utfLen;
318+ int index = 0;
319+ while (buffer.position() < utfLimit) {
320+ int c = buffer.get() & 0xff;
321+ if (c > 127) {
322+ buffer.position(buffer.position() - 1);
323+ return getUTF8Extended(buffer, utfLimit, charArray, index);
324+ }
325+ charArray[index++] = (char)c;
326+ }
327+ return new String(charArray, 0, index);
328+ }
329+
330+ private static String getUTF8Extended(ByteBuffer buffer, int utfLimit, char[] charArray, int index) throws InvalidConstantPoolFormatException {
331+ int c, c2, c3;
332+ while (buffer.position() < utfLimit) {
333+ c = buffer.get() & 0xff;
334+ switch (c >> 4) {
335+ case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
336+ /* 0xxxxxxx*/
337+ charArray[index++] = (char)c;
338+ break;
339+ case 12: case 13:
340+ /* 110x xxxx 10xx xxxx*/
341+ c2 = buffer.get();
342+ if ((c2 & 0xC0) != 0x80)
343+ throw new InvalidConstantPoolFormatException(
344+ "malformed input around byte " + buffer.position());
345+ charArray[index++] = (char)(((c & 0x1F) << 6) |
346+ (c2 & 0x3F));
347+ break;
348+ case 14:
349+ /* 1110 xxxx 10xx xxxx 10xx xxxx */
350+ c2 = buffer.get();
351+ c3 = buffer.get();
352+ if (((c2 & 0xC0) != 0x80) || ((c3 & 0xC0) != 0x80))
353+ throw new InvalidConstantPoolFormatException(
354+ "malformed input around byte " + (buffer.position()));
355+ charArray[index++] = (char)(((c & 0x0F) << 12) |
356+ ((c2 & 0x3F) << 6) |
357+ ((c3 & 0x3F) << 0));
358+ break;
359+ default:
360+ /* 10xx xxxx, 1111 xxxx */
361+ throw new InvalidConstantPoolFormatException(
362+ "malformed input around byte " + buffer.position());
363+ }
364+ }
365+ // The number of chars produced may be less than utflen
366+ return new String(charArray, 0, index);
367+ }
368+}