Source Code Cross Referenced for StackMapAttribute.java in  » Web-Framework » rife-1.6.1 » com » uwyn » rife » asm » attrs » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » rife 1.6.1 » com.uwyn.rife.asm.attrs 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * ASM: a very small and fast Java bytecode manipulation framework
003:         * Copyright (c) 2000-2005 INRIA, France Telecom
004:         * All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         * 1. Redistributions of source code must retain the above copyright
010:         *    notice, this list of conditions and the following disclaimer.
011:         * 2. Redistributions in binary form must reproduce the above copyright
012:         *    notice, this list of conditions and the following disclaimer in the
013:         *    documentation and/or other materials provided with the distribution.
014:         * 3. Neither the name of the copyright holders nor the names of its
015:         *    contributors may be used to endorse or promote products derived from
016:         *    this software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
022:         * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
023:         * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
024:         * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
025:         * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
026:         * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
027:         * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
028:         * THE POSSIBILITY OF SUCH DAMAGE.
029:         */package com.uwyn.rife.asm.attrs;
030:
031:        import java.util.ArrayList;
032:        import java.util.HashSet;
033:        import java.util.Iterator;
034:        import java.util.List;
035:        import java.util.Set;
036:
037:        import com.uwyn.rife.asm.Attribute;
038:        import com.uwyn.rife.asm.ByteVector;
039:        import com.uwyn.rife.asm.ClassReader;
040:        import com.uwyn.rife.asm.ClassWriter;
041:        import com.uwyn.rife.asm.Label;
042:
043:        /**
044:         * StackMapAttribute is used by CDLC preverifier. Definition is given in
045:         * appendix "CLDC Byte Code Typechecker Specification" from CDLC 1.1
046:         * specification. <p> <i>Note that this implementation does not calculate
047:         * StackMapFrame structures from the method bytecode. If method code is changed
048:         * or generated from scratch, then developer is responsible to prepare a correct
049:         * StackMapFrame structures.</i> <p> The format of the stack map in the class
050:         * file is given below. In the following, <ul> <li>if the length of the
051:         * method's byte code1 is 65535 or less, then <tt>uoffset</tt> represents the
052:         * type u2; otherwise <tt>uoffset</tt> represents the type u4.</li> <li>If
053:         * the maximum number of local variables for the method is 65535 or less, then
054:         * <tt>ulocalvar</tt> represents the type u2; otherwise <tt>ulocalvar</tt>
055:         * represents the type u4.</li> <li>If the maximum size of the operand stack
056:         * is 65535 or less, then <tt>ustack</tt> represents the type u2; otherwise
057:         * ustack represents the type u4.</li> </ul>
058:         * 
059:         * <pre>
060:         * stack_map { // attribute StackMap
061:         *   u2 attribute_name_index;
062:         *   u4 attribute_length
063:         *   uoffset number_of_entries;
064:         *   stack_map_frame entries[number_of_entries];
065:         * }
066:         * </pre>
067:         * 
068:         * Each stack map frame has the following format:
069:         * 
070:         * <pre>
071:         * stack_map_frame {
072:         *   uoffset offset;
073:         *   ulocalvar number_of_locals;
074:         *   verification_type_info locals[number_of_locals];
075:         *   ustack number_of_stack_items;
076:         *   verification_type_info stack[number_of_stack_items];
077:         * }
078:         * </pre>
079:         * 
080:         * The <tt>verification_type_info</tt> structure consists of a one-byte tag
081:         * followed by zero or more bytes, giving more information about the tag. Each
082:         * <tt>verification_type_info</tt> structure specifies the verification type
083:         * of one or two locations.
084:         * 
085:         * <pre>
086:         * union verification_type_info {
087:         *   Top_variable_info;
088:         *   Integer_variable_info;
089:         *   Float_variable_info;
090:         *   Long_variable_info;
091:         *   Double_variable_info;
092:         *   Null_variable_info;
093:         *   UninitializedThis_variable_info;
094:         *   Object_variable_info;
095:         *   Uninitialized_variable_info;
096:         * }
097:         *      
098:         * Top_variable_info {
099:         *   u1 tag = ITEM_Top; // 0
100:         * }
101:         *      
102:         * Integer_variable_info {
103:         *   u1 tag = ITEM_Integer; // 1
104:         * }
105:         *      
106:         * Float_variable_info {
107:         *   u1 tag = ITEM_Float; // 2
108:         * }
109:         *      
110:         * Long_variable_info {
111:         *   u1 tag = ITEM_Long; // 4
112:         * }
113:         *      
114:         * Double_variable_info {
115:         *   u1 tag = ITEM_Double; // 3
116:         * }
117:         *      
118:         * Null_variable_info {
119:         *  u1 tag = ITEM_Null; // 5
120:         * }
121:         *      
122:         * UninitializedThis_variable_info {
123:         *   u1 tag = ITEM_UninitializedThis; // 6
124:         * }
125:         *      
126:         * Object_variable_info {
127:         *   u1 tag = ITEM_Object; // 7
128:         *   u2 cpool_index;
129:         * }
130:         *      
131:         * Uninitialized_variable_info {
132:         *   u1 tag = ITEM_Uninitialized // 8
133:         *   uoffset offset;
134:         * }
135:         * </pre>
136:         * 
137:         * @see <a href="http://www.jcp.org/en/jsr/detail?id=139">JSR 139 : Connected
138:         *      Limited Device Configuration 1.1</a>
139:         * 
140:         * @author Eugene Kuleshov
141:         */
142:        public class StackMapAttribute extends Attribute {
143:
144:            static final int MAX_SIZE = 65535;
145:
146:            /**
147:             * A List of <code>StackMapFrame</code> instances.
148:             */
149:            public List frames = new ArrayList();
150:
151:            public StackMapAttribute() {
152:                super ("StackMap");
153:            }
154:
155:            public StackMapAttribute(List frames) {
156:                this ();
157:                this .frames = frames;
158:            }
159:
160:            public List getFrames() {
161:                return frames;
162:            }
163:
164:            public StackMapFrame getFrame(Label label) {
165:                for (int i = 0; i < frames.size(); i++) {
166:                    StackMapFrame frame = (StackMapFrame) frames.get(i);
167:                    if (frame.label == label) {
168:                        return frame;
169:                    }
170:                }
171:                return null;
172:            }
173:
174:            public boolean isUnknown() {
175:                return false;
176:            }
177:
178:            public boolean isCodeAttribute() {
179:                return true;
180:            }
181:
182:            protected Attribute read(ClassReader cr, int off, int len,
183:                    char[] buf, int codeOff, Label[] labels) {
184:                StackMapAttribute attr = new StackMapAttribute();
185:                // note that this is not the size of Code attribute
186:                boolean isExtCodeSize = cr.readInt(codeOff + 4) > MAX_SIZE;
187:                boolean isExtLocals = cr.readUnsignedShort(codeOff + 2) > MAX_SIZE;
188:                boolean isExtStack = cr.readUnsignedShort(codeOff) > MAX_SIZE;
189:
190:                int size = 0;
191:                if (isExtCodeSize) {
192:                    size = cr.readInt(off);
193:                    off += 4;
194:                } else {
195:                    size = cr.readUnsignedShort(off);
196:                    off += 2;
197:                }
198:                for (int i = 0; i < size; i++) {
199:                    int offset;
200:                    if (isExtCodeSize) {
201:                        offset = cr.readInt(off);
202:                        off += 4;
203:                    } else {
204:                        offset = cr.readUnsignedShort(off);
205:                        off += 2;
206:                    }
207:
208:                    Label label = getLabel(offset, labels);
209:                    List locals = new ArrayList();
210:                    List stack = new ArrayList();
211:
212:                    off = readTypeInfo(cr, off, locals, labels, buf,
213:                            isExtLocals, isExtCodeSize);
214:                    off = readTypeInfo(cr, off, stack, labels, buf, isExtStack,
215:                            isExtCodeSize);
216:
217:                    attr.frames.add(new StackMapFrame(label, locals, stack));
218:                }
219:                return attr;
220:            }
221:
222:            private int readTypeInfo(ClassReader cr, int off, List info,
223:                    Label[] labels, char[] buf, boolean isExt, boolean isExtCode) {
224:                int n = 0;
225:                if (isExt) {
226:                    n = cr.readInt(off);
227:                    off += 4;
228:                } else {
229:                    n = cr.readUnsignedShort(off);
230:                    off += 2;
231:                }
232:                for (int j = 0; j < n; j++) {
233:                    int itemType = cr.readByte(off++);
234:                    StackMapType typeInfo = StackMapType.getTypeInfo(itemType);
235:                    info.add(typeInfo);
236:                    switch (itemType) {
237:                    case StackMapType.ITEM_Object: //
238:                        typeInfo.setObject(cr.readClass(off, buf));
239:                        off += 2;
240:                        break;
241:                    case StackMapType.ITEM_Uninitialized: //
242:                        int offset;
243:                        if (isExtCode) {
244:                            offset = cr.readInt(off);
245:                            off += 4;
246:                        } else {
247:                            offset = cr.readUnsignedShort(off);
248:                            off += 2;
249:                        }
250:                        typeInfo.setLabel(getLabel(offset, labels));
251:                        break;
252:                    }
253:                }
254:                return off;
255:            }
256:
257:            private void writeTypeInfo(ByteVector bv, ClassWriter cw,
258:                    List info, int max) {
259:                if (max > StackMapAttribute.MAX_SIZE) {
260:                    bv.putInt(info.size());
261:                } else {
262:                    bv.putShort(info.size());
263:                }
264:                for (int j = 0; j < info.size(); j++) {
265:                    StackMapType typeInfo = (StackMapType) info.get(j);
266:                    bv.putByte(typeInfo.getType());
267:                    switch (typeInfo.getType()) {
268:                    case StackMapType.ITEM_Object: //
269:                        bv.putShort(cw.newClass(typeInfo.getObject()));
270:                        break;
271:
272:                    case StackMapType.ITEM_Uninitialized: //
273:                        bv.putShort(typeInfo.getLabel().getOffset());
274:                        break;
275:
276:                    }
277:                }
278:            }
279:
280:            private Label getLabel(int offset, Label[] labels) {
281:                Label l = labels[offset];
282:                if (l != null) {
283:                    return l;
284:                }
285:                return labels[offset] = new Label();
286:            }
287:
288:            protected ByteVector write(ClassWriter cw, byte[] code, int len,
289:                    int maxStack, int maxLocals) {
290:                ByteVector bv = new ByteVector();
291:                if (code != null && code.length > MAX_SIZE) { // TODO verify value
292:                    bv.putInt(frames.size());
293:                } else {
294:                    bv.putShort(frames.size());
295:                }
296:                for (int i = 0; i < frames.size(); i++) {
297:                    writeFrame((StackMapFrame) frames.get(i), cw, maxStack,
298:                            maxLocals, bv);
299:                }
300:                return bv;
301:            }
302:
303:            protected Label[] getLabels() {
304:                HashSet labels = new HashSet();
305:                for (int i = 0; i < frames.size(); i++) {
306:                    getFrameLabels((StackMapFrame) frames.get(i), labels);
307:                }
308:                return (Label[]) labels.toArray(new Label[labels.size()]);
309:            }
310:
311:            private void writeFrame(StackMapFrame frame, ClassWriter cw,
312:                    int maxStack, int maxLocals, ByteVector bv) {
313:                bv.putShort(frame.label.getOffset());
314:                writeTypeInfo(bv, cw, frame.locals, maxLocals);
315:                writeTypeInfo(bv, cw, frame.stack, maxStack);
316:            }
317:
318:            private void getFrameLabels(StackMapFrame frame, Set labels) {
319:                labels.add(frame.label);
320:                getTypeInfoLabels(labels, frame.locals);
321:                getTypeInfoLabels(labels, frame.stack);
322:            }
323:
324:            private void getTypeInfoLabels(Set labels, List info) {
325:                for (Iterator it = info.iterator(); it.hasNext();) {
326:                    StackMapType typeInfo = (StackMapType) it.next();
327:                    if (typeInfo.getType() == StackMapType.ITEM_Uninitialized) {
328:                        labels.add(typeInfo.getLabel());
329:                    }
330:                }
331:            }
332:
333:            public String toString() {
334:                StringBuffer sb = new StringBuffer("StackMap[");
335:                for (int i = 0; i < frames.size(); i++) {
336:                    sb.append('\n').append('[').append(frames.get(i)).append(
337:                            ']');
338:                }
339:                sb.append("\n]");
340:                return sb.toString();
341:            }
342:        }
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