Source Code Cross Referenced for BasicVerifier.java in  » IDE » tIDE » org » objectweb » asm » tree » analysis » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE » tIDE » org.objectweb.asm.tree.analysis 
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 org.objectweb.asm.tree.analysis;
030:
031:        import java.util.List;
032:
033:        import org.objectweb.asm.Type;
034:        import org.objectweb.asm.tree.AbstractInsnNode;
035:        import org.objectweb.asm.tree.FieldInsnNode;
036:        import org.objectweb.asm.tree.MethodInsnNode;
037:
038:        /**
039:         * An extended {@link BasicInterpreter} that checks that bytecode instructions
040:         * are correctly used.
041:         *
042:         * @author Eric Bruneton
043:         * @author Bing Ran
044:         */
045:        public class BasicVerifier extends BasicInterpreter {
046:
047:            public Value copyOperation(final AbstractInsnNode insn,
048:                    final Value value) throws AnalyzerException {
049:                Value expected;
050:                switch (insn.getOpcode()) {
051:                case ILOAD:
052:                case ISTORE:
053:                    expected = BasicValue.INT_VALUE;
054:                    break;
055:                case FLOAD:
056:                case FSTORE:
057:                    expected = BasicValue.FLOAT_VALUE;
058:                    break;
059:                case LLOAD:
060:                case LSTORE:
061:                    expected = BasicValue.LONG_VALUE;
062:                    break;
063:                case DLOAD:
064:                case DSTORE:
065:                    expected = BasicValue.DOUBLE_VALUE;
066:                    break;
067:                case ALOAD:
068:                    if (!((BasicValue) value).isReference()) {
069:                        throw new AnalyzerException(null,
070:                                "an object reference", value);
071:                    }
072:                    return value;
073:                case ASTORE:
074:                    if (!((BasicValue) value).isReference()
075:                            && value != BasicValue.RETURNADDRESS_VALUE) {
076:                        throw new AnalyzerException(null,
077:                                "an object reference or a return address",
078:                                value);
079:                    }
080:                    return value;
081:                default:
082:                    return value;
083:                }
084:                // type is necessarily a primitive type here,
085:                // so value must be == to expected value
086:                if (value != expected) {
087:                    throw new AnalyzerException(null, expected, value);
088:                }
089:                return value;
090:            }
091:
092:            public Value unaryOperation(final AbstractInsnNode insn,
093:                    final Value value) throws AnalyzerException {
094:                Value expected;
095:                switch (insn.getOpcode()) {
096:                case INEG:
097:                case IINC:
098:                case I2F:
099:                case I2L:
100:                case I2D:
101:                case I2B:
102:                case I2C:
103:                case I2S:
104:                case IFEQ:
105:                case IFNE:
106:                case IFLT:
107:                case IFGE:
108:                case IFGT:
109:                case IFLE:
110:                case TABLESWITCH:
111:                case LOOKUPSWITCH:
112:                case IRETURN:
113:                case NEWARRAY:
114:                case ANEWARRAY:
115:                    expected = BasicValue.INT_VALUE;
116:                    break;
117:                case FNEG:
118:                case F2I:
119:                case F2L:
120:                case F2D:
121:                case FRETURN:
122:                    expected = BasicValue.FLOAT_VALUE;
123:                    break;
124:                case LNEG:
125:                case L2I:
126:                case L2F:
127:                case L2D:
128:                case LRETURN:
129:                    expected = BasicValue.LONG_VALUE;
130:                    break;
131:                case DNEG:
132:                case D2I:
133:                case D2F:
134:                case D2L:
135:                case DRETURN:
136:                    expected = BasicValue.DOUBLE_VALUE;
137:                    break;
138:                case GETFIELD:
139:                    expected = newValue(Type.getType("L"
140:                            + ((FieldInsnNode) insn).owner + ";"));
141:                    break;
142:                case CHECKCAST:
143:                    if (!((BasicValue) value).isReference()) {
144:                        throw new AnalyzerException(null,
145:                                "an object reference", value);
146:                    }
147:                    return super .unaryOperation(insn, value);
148:                case ARRAYLENGTH:
149:                    if (!isArrayValue(value)) {
150:                        throw new AnalyzerException(null, "an array reference",
151:                                value);
152:                    }
153:                    return super .unaryOperation(insn, value);
154:                case ARETURN:
155:                case ATHROW:
156:                case INSTANCEOF:
157:                case MONITORENTER:
158:                case MONITOREXIT:
159:                case IFNULL:
160:                case IFNONNULL:
161:                    if (!((BasicValue) value).isReference()) {
162:                        throw new AnalyzerException(null,
163:                                "an object reference", value);
164:                    }
165:                    return super .unaryOperation(insn, value);
166:                case PUTSTATIC:
167:                    expected = newValue(Type
168:                            .getType(((FieldInsnNode) insn).desc));
169:                    break;
170:                default:
171:                    throw new Error("Internal error.");
172:                }
173:                if (!isSubTypeOf(value, expected)) {
174:                    throw new AnalyzerException(null, expected, value);
175:                }
176:                return super .unaryOperation(insn, value);
177:            }
178:
179:            public Value binaryOperation(final AbstractInsnNode insn,
180:                    final Value value1, final Value value2)
181:                    throws AnalyzerException {
182:                Value expected1;
183:                Value expected2;
184:                switch (insn.getOpcode()) {
185:                case IALOAD:
186:                    expected1 = newValue(Type.getType("[I"));
187:                    expected2 = BasicValue.INT_VALUE;
188:                    break;
189:                case BALOAD:
190:                    if (!isSubTypeOf(value1, newValue(Type.getType("[Z")))) {
191:                        expected1 = newValue(Type.getType("[B"));
192:                    } else {
193:                        expected1 = newValue(Type.getType("[Z"));
194:                    }
195:                    expected2 = BasicValue.INT_VALUE;
196:                    break;
197:                case CALOAD:
198:                    expected1 = newValue(Type.getType("[C"));
199:                    expected2 = BasicValue.INT_VALUE;
200:                    break;
201:                case SALOAD:
202:                    expected1 = newValue(Type.getType("[S"));
203:                    expected2 = BasicValue.INT_VALUE;
204:                    break;
205:                case LALOAD:
206:                    expected1 = newValue(Type.getType("[J"));
207:                    expected2 = BasicValue.INT_VALUE;
208:                    break;
209:                case FALOAD:
210:                    expected1 = newValue(Type.getType("[F"));
211:                    expected2 = BasicValue.INT_VALUE;
212:                    break;
213:                case DALOAD:
214:                    expected1 = newValue(Type.getType("[D"));
215:                    expected2 = BasicValue.INT_VALUE;
216:                    break;
217:                case AALOAD:
218:                    expected1 = newValue(Type.getType("[Ljava/lang/Object;"));
219:                    expected2 = BasicValue.INT_VALUE;
220:                    break;
221:                case IADD:
222:                case ISUB:
223:                case IMUL:
224:                case IDIV:
225:                case IREM:
226:                case ISHL:
227:                case ISHR:
228:                case IUSHR:
229:                case IAND:
230:                case IOR:
231:                case IXOR:
232:                case IF_ICMPEQ:
233:                case IF_ICMPNE:
234:                case IF_ICMPLT:
235:                case IF_ICMPGE:
236:                case IF_ICMPGT:
237:                case IF_ICMPLE:
238:                    expected1 = BasicValue.INT_VALUE;
239:                    expected2 = BasicValue.INT_VALUE;
240:                    break;
241:                case FADD:
242:                case FSUB:
243:                case FMUL:
244:                case FDIV:
245:                case FREM:
246:                case FCMPL:
247:                case FCMPG:
248:                    expected1 = BasicValue.FLOAT_VALUE;
249:                    expected2 = BasicValue.FLOAT_VALUE;
250:                    break;
251:                case LADD:
252:                case LSUB:
253:                case LMUL:
254:                case LDIV:
255:                case LREM:
256:                case LAND:
257:                case LOR:
258:                case LXOR:
259:                case LCMP:
260:                    expected1 = BasicValue.LONG_VALUE;
261:                    expected2 = BasicValue.LONG_VALUE;
262:                    break;
263:                case LSHL:
264:                case LSHR:
265:                case LUSHR:
266:                    expected1 = BasicValue.LONG_VALUE;
267:                    expected2 = BasicValue.INT_VALUE;
268:                    break;
269:                case DADD:
270:                case DSUB:
271:                case DMUL:
272:                case DDIV:
273:                case DREM:
274:                case DCMPL:
275:                case DCMPG:
276:                    expected1 = BasicValue.DOUBLE_VALUE;
277:                    expected2 = BasicValue.DOUBLE_VALUE;
278:                    break;
279:                case IF_ACMPEQ:
280:                case IF_ACMPNE:
281:                    expected1 = BasicValue.REFERENCE_VALUE;
282:                    expected2 = BasicValue.REFERENCE_VALUE;
283:                    break;
284:                case PUTFIELD:
285:                    FieldInsnNode fin = (FieldInsnNode) insn;
286:                    expected1 = newValue(Type.getType("L" + fin.owner + ";"));
287:                    expected2 = newValue(Type.getType(fin.desc));
288:                    break;
289:                default:
290:                    throw new Error("Internal error.");
291:                }
292:                if (!isSubTypeOf(value1, expected1)) {
293:                    throw new AnalyzerException("First argument", expected1,
294:                            value1);
295:                } else if (!isSubTypeOf(value2, expected2)) {
296:                    throw new AnalyzerException("Second argument", expected2,
297:                            value2);
298:                }
299:                if (insn.getOpcode() == AALOAD) {
300:                    return getElementValue(value1);
301:                } else {
302:                    return super .binaryOperation(insn, value1, value2);
303:                }
304:            }
305:
306:            public Value ternaryOperation(final AbstractInsnNode insn,
307:                    final Value value1, final Value value2, final Value value3)
308:                    throws AnalyzerException {
309:                Value expected1;
310:                Value expected3;
311:                switch (insn.getOpcode()) {
312:                case IASTORE:
313:                    expected1 = newValue(Type.getType("[I"));
314:                    expected3 = BasicValue.INT_VALUE;
315:                    break;
316:                case BASTORE:
317:                    if (!isSubTypeOf(value1, newValue(Type.getType("[Z")))) {
318:                        expected1 = newValue(Type.getType("[B"));
319:                    } else {
320:                        expected1 = newValue(Type.getType("[Z"));
321:                    }
322:                    expected3 = BasicValue.INT_VALUE;
323:                    break;
324:                case CASTORE:
325:                    expected1 = newValue(Type.getType("[C"));
326:                    expected3 = BasicValue.INT_VALUE;
327:                    break;
328:                case SASTORE:
329:                    expected1 = newValue(Type.getType("[S"));
330:                    expected3 = BasicValue.INT_VALUE;
331:                    break;
332:                case LASTORE:
333:                    expected1 = newValue(Type.getType("[J"));
334:                    expected3 = BasicValue.LONG_VALUE;
335:                    break;
336:                case FASTORE:
337:                    expected1 = newValue(Type.getType("[F"));
338:                    expected3 = BasicValue.FLOAT_VALUE;
339:                    break;
340:                case DASTORE:
341:                    expected1 = newValue(Type.getType("[D"));
342:                    expected3 = BasicValue.DOUBLE_VALUE;
343:                    break;
344:                case AASTORE:
345:                    expected1 = value1;
346:                    expected3 = BasicValue.REFERENCE_VALUE;
347:                    break;
348:                default:
349:                    throw new Error("Internal error.");
350:                }
351:                if (!isSubTypeOf(value1, expected1)) {
352:                    throw new AnalyzerException("First argument", "a "
353:                            + expected1 + " array reference", value1);
354:                } else if (value2 != BasicValue.INT_VALUE) {
355:                    throw new AnalyzerException("Second argument",
356:                            BasicValue.INT_VALUE, value2);
357:                } else if (!isSubTypeOf(value3, expected3)) {
358:                    throw new AnalyzerException("Third argument", expected3,
359:                            value3);
360:                }
361:                return null;
362:            }
363:
364:            public Value naryOperation(final AbstractInsnNode insn,
365:                    final List values) throws AnalyzerException {
366:                int opcode = insn.getOpcode();
367:                if (opcode == MULTIANEWARRAY) {
368:                    for (int i = 0; i < values.size(); ++i) {
369:                        if (values.get(i) != BasicValue.INT_VALUE) {
370:                            throw new AnalyzerException(null,
371:                                    BasicValue.INT_VALUE, (Value) values.get(i));
372:                        }
373:                    }
374:                } else {
375:                    int i = 0;
376:                    int j = 0;
377:                    if (opcode != INVOKESTATIC) {
378:                        String own = ((MethodInsnNode) insn).owner;
379:                        if (own.charAt(0) != '[') { // can happen with JDK1.5 clone()
380:                            own = "L" + own + ";";
381:                        }
382:                        Type owner = Type.getType(own);
383:                        if (!isSubTypeOf((Value) values.get(i++),
384:                                newValue(owner))) {
385:                            throw new AnalyzerException("Method owner",
386:                                    newValue(owner), (Value) values.get(0));
387:                        }
388:                    }
389:                    Type[] args = Type
390:                            .getArgumentTypes(((MethodInsnNode) insn).desc);
391:                    while (i < values.size()) {
392:                        Value expected = newValue(args[j++]);
393:                        Value encountered = (Value) values.get(i++);
394:                        if (!isSubTypeOf(encountered, expected)) {
395:                            throw new AnalyzerException("Argument " + j,
396:                                    expected, encountered);
397:                        }
398:                    }
399:                }
400:                return super .naryOperation(insn, values);
401:            }
402:
403:            protected boolean isArrayValue(final Value value) {
404:                return ((BasicValue) value).isReference();
405:            }
406:
407:            protected Value getElementValue(final Value objectArrayValue)
408:                    throws AnalyzerException {
409:                return BasicValue.REFERENCE_VALUE;
410:            }
411:
412:            protected boolean isSubTypeOf(final Value value,
413:                    final Value expected) {
414:                return value == expected;
415:            }
416:        }
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