Source Code Cross Referenced for LocalVariableAttribute.java in  » Byte-Code » Javassist » javassist » bytecode » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Byte Code » Javassist » javassist.bytecode 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Javassist, a Java-bytecode translator toolkit.
003:         * Copyright (C) 1999-2006 Shigeru Chiba. All Rights Reserved.
004:         *
005:         * The contents of this file are subject to the Mozilla Public License Version
006:         * 1.1 (the "License"); you may not use this file except in compliance with
007:         * the License.  Alternatively, the contents of this file may be used under
008:         * the terms of the GNU Lesser General Public License Version 2.1 or later.
009:         *
010:         * Software distributed under the License is distributed on an "AS IS" basis,
011:         * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
012:         * for the specific language governing rights and limitations under the
013:         * License.
014:         */
015:
016:        package javassist.bytecode;
017:
018:        import java.io.DataInputStream;
019:        import java.io.IOException;
020:        import java.util.Map;
021:
022:        /**
023:         * <code>LocalVariableTable_attribute</code> or
024:         * <code>LocalVariableTypeTable_attribute</code>.
025:         */
026:        public class LocalVariableAttribute extends AttributeInfo {
027:            /**
028:             * The name of this attribute <code>"LocalVariableTable"</code>.
029:             */
030:            public static final String tag = "LocalVariableTable";
031:
032:            /**
033:             * The name of the attribute <code>"LocalVariableTypeTable"</code>.
034:             */
035:            public static final String typeTag = "LocalVariableTypeTable";
036:
037:            /**
038:             * Constructs an empty LocalVariableTable.
039:             */
040:            public LocalVariableAttribute(ConstPool cp) {
041:                this (cp, tag);
042:            }
043:
044:            /**
045:             * Constructs an empty LocalVariableTable.
046:             *
047:             * @param name      the attribute name.
048:             *                  <code>LocalVariableAttribute.tag</code> or
049:             *                  <code>LocalVariableAttribute.typeTag</code>.
050:             * @see #tag
051:             * @see #typeTag
052:             * @since 3.1
053:             */
054:            public LocalVariableAttribute(ConstPool cp, String name) {
055:                super (cp, name, new byte[2]);
056:                ByteArray.write16bit(0, info, 0);
057:            }
058:
059:            LocalVariableAttribute(ConstPool cp, int n, DataInputStream in)
060:                    throws IOException {
061:                super (cp, n, in);
062:            }
063:
064:            private LocalVariableAttribute(ConstPool cp, String name, byte[] i) {
065:                super (cp, name, i);
066:            }
067:
068:            /**
069:             * Appends a new entry to <code>local_variable_table</code>.
070:             *
071:             * @param startPc           <code>start_pc</code>
072:             * @param length            <code>length</code>
073:             * @param nameIndex         <code>name_index</code>
074:             * @param descriptorIndex   <code>descriptor_index</code>
075:             * @param index             <code>index</code>
076:             */
077:            public void addEntry(int startPc, int length, int nameIndex,
078:                    int descriptorIndex, int index) {
079:                int size = info.length;
080:                byte[] newInfo = new byte[size + 10];
081:                ByteArray.write16bit(tableLength() + 1, newInfo, 0);
082:                for (int i = 2; i < size; ++i)
083:                    newInfo[i] = info[i];
084:
085:                ByteArray.write16bit(startPc, newInfo, size);
086:                ByteArray.write16bit(length, newInfo, size + 2);
087:                ByteArray.write16bit(nameIndex, newInfo, size + 4);
088:                ByteArray.write16bit(descriptorIndex, newInfo, size + 6);
089:                ByteArray.write16bit(index, newInfo, size + 8);
090:                info = newInfo;
091:            }
092:
093:            /**
094:             * Returns <code>local_variable_table_length</code>.
095:             * This represents the number of entries in the table.
096:             */
097:            public int tableLength() {
098:                return ByteArray.readU16bit(info, 0);
099:            }
100:
101:            /**
102:             * Returns <code>local_variable_table[i].start_pc</code>.
103:             * This represents the index into the code array from which the local
104:             * variable is effective.
105:             *
106:             * @param i         the i-th entry.
107:             */
108:            public int startPc(int i) {
109:                return ByteArray.readU16bit(info, i * 10 + 2);
110:            }
111:
112:            /**
113:             * Returns <code>local_variable_table[i].length</code>.
114:             * This represents the length of the code region in which the local
115:             * variable is effective.
116:             *
117:             * @param i         the i-th entry.
118:             */
119:            public int codeLength(int i) {
120:                return ByteArray.readU16bit(info, i * 10 + 4);
121:            }
122:
123:            /**
124:             * Adjusts start_pc and length if bytecode is inserted in a method body.
125:             */
126:            void shiftPc(int where, int gapLength, boolean exclusive) {
127:                int n = tableLength();
128:                for (int i = 0; i < n; ++i) {
129:                    int pos = i * 10 + 2;
130:                    int pc = ByteArray.readU16bit(info, pos);
131:                    int len = ByteArray.readU16bit(info, pos + 2);
132:
133:                    /* if pc == 0, then the local variable is a method parameter.
134:                     */
135:                    if (pc > where || (exclusive && pc == where && pc != 0))
136:                        ByteArray.write16bit(pc + gapLength, info, pos);
137:                    else if (pc + len > where)
138:                        ByteArray.write16bit(len + gapLength, info, pos + 2);
139:                }
140:            }
141:
142:            /**
143:             * Returns the value of <code>local_variable_table[i].name_index</code>.
144:             * This represents the name of the local variable.
145:             *
146:             * @param i         the i-th entry.
147:             */
148:            public int nameIndex(int i) {
149:                return ByteArray.readU16bit(info, i * 10 + 6);
150:            }
151:
152:            /**
153:             * Returns the name of the local variable
154:             * specified by <code>local_variable_table[i].name_index</code>.
155:             *
156:             * @param i         the i-th entry.
157:             */
158:            public String variableName(int i) {
159:                return getConstPool().getUtf8Info(nameIndex(i));
160:            }
161:
162:            /**
163:             * Returns the value of
164:             * <code>local_variable_table[i].descriptor_index</code>.
165:             * This represents the type descriptor of the local variable.
166:             * <p>
167:             * If this attribute represents a LocalVariableTypeTable attribute,
168:             * this method returns the value of
169:             * <code>local_variable_type_table[i].signature_index</code>.
170:             * It represents the type of the local variable.
171:             *
172:             * @param i         the i-th entry.
173:             */
174:            public int descriptorIndex(int i) {
175:                return ByteArray.readU16bit(info, i * 10 + 8);
176:            }
177:
178:            /**
179:             * This method is equivalent to <code>descriptorIndex()</code>.
180:             * If this attribute represents a LocalVariableTypeTable attribute,
181:             * this method should be used instead of <code>descriptorIndex()</code>
182:             * since the method name is more appropriate.
183:             * 
184:             * @param i         the i-th entry.
185:             * @see #descriptorIndex(int)
186:             */
187:            public int signatureIndex(int i) {
188:                return descriptorIndex(i);
189:            }
190:
191:            /**
192:             * Returns the type descriptor of the local variable
193:             * specified by <code>local_variable_table[i].descriptor_index</code>.
194:             * <p>
195:             * If this attribute represents a LocalVariableTypeTable attribute,
196:             * this method returns the type signature of the local variable
197:             * specified by <code>local_variable_type_table[i].signature_index</code>.
198:             *
199:             * @param i         the i-th entry.
200:             */
201:            public String descriptor(int i) {
202:                return getConstPool().getUtf8Info(descriptorIndex(i));
203:            }
204:
205:            /**
206:             * This method is equivalent to <code>descriptor()</code>.
207:             * If this attribute represents a LocalVariableTypeTable attribute,
208:             * this method should be used instead of <code>descriptor()</code>
209:             * since the method name is more appropriate.
210:             * 
211:             * @param i         the i-th entry.
212:             * @see #descriptor(int)
213:             */
214:            public String signature(int i) {
215:                return descriptor(i);
216:            }
217:
218:            /**
219:             * Returns <code>local_variable_table[i].index</code>.
220:             * This represents the index of the local variable.
221:             *
222:             * @param i         the i-th entry.
223:             */
224:            public int index(int i) {
225:                return ByteArray.readU16bit(info, i * 10 + 10);
226:            }
227:
228:            /**
229:             * Makes a copy.
230:             *
231:             * @param newCp     the constant pool table used by the new copy.
232:             * @param classnames        should be null.
233:             */
234:            public AttributeInfo copy(ConstPool newCp, Map classnames) {
235:                byte[] src = get();
236:                byte[] dest = new byte[src.length];
237:                ConstPool cp = getConstPool();
238:                LocalVariableAttribute attr = new LocalVariableAttribute(newCp,
239:                        getName(), dest);
240:                int n = ByteArray.readU16bit(src, 0);
241:                ByteArray.write16bit(n, dest, 0);
242:                int j = 2;
243:                for (int i = 0; i < n; ++i) {
244:                    int start = ByteArray.readU16bit(src, j);
245:                    int len = ByteArray.readU16bit(src, j + 2);
246:                    int name = ByteArray.readU16bit(src, j + 4);
247:                    int type = ByteArray.readU16bit(src, j + 6);
248:                    int index = ByteArray.readU16bit(src, j + 8);
249:
250:                    ByteArray.write16bit(start, dest, j);
251:                    ByteArray.write16bit(len, dest, j + 2);
252:                    if (name != 0)
253:                        name = cp.copy(name, newCp, null);
254:
255:                    ByteArray.write16bit(name, dest, j + 4);
256:
257:                    if (type != 0)
258:                        type = cp.copy(type, newCp, null);
259:
260:                    ByteArray.write16bit(type, dest, j + 6);
261:                    ByteArray.write16bit(index, dest, j + 8);
262:                    j += 10;
263:                }
264:
265:                return attr;
266:            }
267:        }
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