Source Code Cross Referenced for ModifiedPass3bVerifier.java in  » Byte-Code » asm » org » aspectj » apache » bcel » verifier » structurals » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Byte Code » asm » org.aspectj.apache.bcel.verifier.structurals 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright  2000-2004 The Apache Software Foundation
003:         *
004:         *  Licensed under the Apache License, Version 2.0 (the "License"); 
005:         *  you may not use this file except in compliance with the License.
006:         *  You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         *  Unless required by applicable law or agreed to in writing, software
011:         *  distributed under the License is distributed on an "AS IS" BASIS,
012:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         *  See the License for the specific language governing permissions and
014:         *  limitations under the License. 
015:         *
016:         */
017:        package org.aspectj.apache.bcel.verifier.structurals;
018:
019:        import java.io.PrintWriter;
020:        import java.io.StringWriter;
021:        import java.util.ArrayList;
022:        import java.util.Random;
023:        import java.util.Vector;
024:        import org.aspectj.apache.bcel.Constants;
025:        import org.aspectj.apache.bcel.classfile.JavaClass;
026:        import org.aspectj.apache.bcel.classfile.Method;
027:        import org.aspectj.apache.bcel.generic.ConstantPoolGen;
028:        import org.aspectj.apache.bcel.generic.JsrInstruction;
029:        import org.aspectj.apache.bcel.generic.MethodGen;
030:        import org.aspectj.apache.bcel.generic.ObjectType;
031:        import org.aspectj.apache.bcel.generic.RET;
032:        import org.aspectj.apache.bcel.generic.ReturnaddressType;
033:        import org.aspectj.apache.bcel.generic.Type;
034:        import org.aspectj.apache.bcel.verifier.VerificationResult;
035:        import org.aspectj.apache.bcel.verifier.exc.AssertionViolatedException;
036:        import org.aspectj.apache.bcel.verifier.exc.VerifierConstraintViolatedException;
037:        import org.aspectj.apache.bcel.verifier.structurals.ControlFlowGraph;
038:        import org.aspectj.apache.bcel.verifier.structurals.ExceptionHandler;
039:        import org.aspectj.apache.bcel.verifier.structurals.ExecutionVisitor;
040:        import org.aspectj.apache.bcel.verifier.structurals.Frame;
041:        import org.aspectj.apache.bcel.verifier.structurals.InstConstraintVisitor;
042:        import org.aspectj.apache.bcel.verifier.structurals.InstructionContext;
043:        import org.aspectj.apache.bcel.verifier.structurals.OperandStack;
044:        import org.aspectj.apache.bcel.verifier.structurals.UninitializedObjectType;
045:
046:        /**
047:         * This PassVerifier verifies a method of class file according to pass 3,
048:         * so-called structural verification as described in The Java Virtual Machine
049:         * Specification, 2nd edition. More detailed information is to be found at the
050:         * do_verify() method's documentation.
051:         * 
052:         * @version $Id: ModifiedPass3bVerifier.java,v 1.1.2.1 2005/09/16 07:19:38
053:         *          ebruneton Exp $
054:         * @author <A HREF="http://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A>
055:         * @see #do_verify()
056:         */
057:
058:        public final class ModifiedPass3bVerifier {
059:            /*
060:             * TODO: Throughout pass 3b, upper halves of LONG and DOUBLE are represented
061:             * by Type.UNKNOWN. This should be changed in favour of LONG_Upper and
062:             * DOUBLE_Upper as in pass 2.
063:             */
064:
065:            /**
066:             * An InstructionContextQueue is a utility class that holds
067:             * (InstructionContext, ArrayList) pairs in a Queue data structure. This is
068:             * used to hold information about InstructionContext objects externally ---
069:             * i.e. that information is not saved inside the InstructionContext object
070:             * itself. This is useful to save the execution path of the symbolic
071:             * execution of the Pass3bVerifier - this is not information that belongs
072:             * into the InstructionContext object itself. Only at "execute()"ing time,
073:             * an InstructionContext object will get the current information we have
074:             * about its symbolic execution predecessors.
075:             */
076:            private static final class InstructionContextQueue {
077:                private final Vector ics = new Vector(); // Type: InstructionContext
078:                private final Vector ecs = new Vector(); // Type: ArrayList (of
079:
080:                // InstructionContext)
081:
082:                public void add(final InstructionContext ic,
083:                        final ArrayList executionChain) {
084:                    ics.add(ic);
085:                    ecs.add(executionChain);
086:                }
087:
088:                public boolean isEmpty() {
089:                    return ics.isEmpty();
090:                }
091:
092:                public void remove() {
093:                    this .remove(0);
094:                }
095:
096:                public void remove(final int i) {
097:                    ics.remove(i);
098:                    ecs.remove(i);
099:                }
100:
101:                public InstructionContext getIC(final int i) {
102:                    return (InstructionContext) ics.get(i);
103:                }
104:
105:                public ArrayList getEC(final int i) {
106:                    return (ArrayList) ecs.get(i);
107:                }
108:
109:                public int size() {
110:                    return ics.size();
111:                }
112:            } // end Inner Class InstructionContextQueue
113:
114:            /** In DEBUG mode, the verification algorithm is not randomized. */
115:            private static final boolean DEBUG = true;
116:
117:            /** The Verifier that created this. */
118:            private JavaClass jc;
119:
120:            /** The method number to verify. */
121:            private int method_no;
122:
123:            /**
124:             * This class should only be instantiated by a Verifier.
125:             * 
126:             * @param jc
127:             * @param method_no
128:             * 
129:             * @see org.apache.bcel.verifier.Verifier
130:             */
131:            public ModifiedPass3bVerifier(final JavaClass jc,
132:                    final int method_no) {
133:                this .jc = jc;
134:                this .method_no = method_no;
135:            }
136:
137:            /**
138:             * Whenever the outgoing frame situation of an InstructionContext changes,
139:             * all its successors are put [back] into the queue [as if they were
140:             * unvisited]. The proof of termination is about the existence of a fix
141:             * point of frame merging.
142:             * 
143:             * @param cfg
144:             * @param start
145:             * @param vanillaFrame
146:             * @param icv
147:             * @param ev
148:             */
149:            private void circulationPump(final ControlFlowGraph cfg,
150:                    final InstructionContext start, final Frame vanillaFrame,
151:                    final InstConstraintVisitor icv, final ExecutionVisitor ev) {
152:                final Random random = new Random();
153:                InstructionContextQueue icq = new InstructionContextQueue();
154:
155:                start.execute(vanillaFrame, new ArrayList(), icv, ev); // new
156:                // ArrayList()
157:                // <=> no
158:                // Instruction
159:                // was executed
160:                // before
161:                // => Top-Level routine (no jsr call before)
162:                icq.add(start, new ArrayList());
163:
164:                // LOOP!
165:                while (!icq.isEmpty()) {
166:                    InstructionContext u;
167:                    ArrayList ec;
168:                    if (!DEBUG) {
169:                        int r = random.nextInt(icq.size());
170:                        u = icq.getIC(r);
171:                        ec = icq.getEC(r);
172:                        icq.remove(r);
173:                    } else {
174:                        u = icq.getIC(0);
175:                        ec = icq.getEC(0);
176:                        icq.remove(0);
177:                    }
178:
179:                    ArrayList oldchain = (ArrayList) ec.clone();
180:                    ArrayList newchain = (ArrayList) ec.clone();
181:                    newchain.add(u);
182:
183:                    if (u.getInstruction().getInstruction() instanceof  RET) {
184:                        // System.err.println(u);
185:                        // We can only follow _one_ successor, the one after the
186:                        // JSR that was recently executed.
187:                        RET ret = (RET) u.getInstruction().getInstruction();
188:                        ReturnaddressType t = (ReturnaddressType) u
189:                                .getOutFrame(oldchain).getLocals().get(
190:                                        ret.getIndex());
191:                        InstructionContext theSuccessor = cfg.contextOf(t
192:                                .getTarget());
193:
194:                        // Sanity check
195:                        InstructionContext lastJSR = null;
196:                        int skip_jsr = 0;
197:                        for (int ss = oldchain.size() - 1; ss >= 0; ss--) {
198:                            if (skip_jsr < 0) {
199:                                throw new AssertionViolatedException(
200:                                        "More RET than JSR in execution chain?!");
201:                            }
202:                            // System.err.println("+"+oldchain.get(ss));
203:                            if (((InstructionContext) oldchain.get(ss))
204:                                    .getInstruction().getInstruction() instanceof  JsrInstruction) {
205:                                if (skip_jsr == 0) {
206:                                    lastJSR = (InstructionContext) oldchain
207:                                            .get(ss);
208:                                    break;
209:                                } else {
210:                                    skip_jsr--;
211:                                }
212:                            }
213:                            if (((InstructionContext) oldchain.get(ss))
214:                                    .getInstruction().getInstruction() instanceof  RET) {
215:                                skip_jsr++;
216:                            }
217:                        }
218:                        if (lastJSR == null) {
219:                            throw new AssertionViolatedException(
220:                                    "RET without a JSR before in ExecutionChain?! EC: '"
221:                                            + oldchain + "'.");
222:                        }
223:                        JsrInstruction jsr = (JsrInstruction) lastJSR
224:                                .getInstruction().getInstruction();
225:                        if (theSuccessor != cfg.contextOf(jsr
226:                                .physicalSuccessor())) {
227:                            throw new AssertionViolatedException("RET '"
228:                                    + u.getInstruction()
229:                                    + "' info inconsistent: jump back to '"
230:                                    + theSuccessor + "' or '"
231:                                    + cfg.contextOf(jsr.physicalSuccessor())
232:                                    + "'?");
233:                        }
234:
235:                        if (theSuccessor.execute(u.getOutFrame(oldchain),
236:                                newchain, icv, ev)) {
237:                            icq.add(theSuccessor, (ArrayList) newchain.clone());
238:                        }
239:                    } else {// "not a ret"
240:
241:                        // Normal successors. Add them to the queue of successors.
242:                        InstructionContext[] succs = u.getSuccessors();
243:                        for (int s = 0; s < succs.length; s++) {
244:                            InstructionContext v = succs[s];
245:                            if (v.execute(u.getOutFrame(oldchain), newchain,
246:                                    icv, ev)) {
247:                                icq.add(v, (ArrayList) newchain.clone());
248:                            }
249:                        }
250:                    }// end "not a ret"
251:
252:                    // Exception Handlers. Add them to the queue of successors.
253:                    // [subroutines are never protected; mandated by JustIce]
254:                    ExceptionHandler[] exc_hds = u.getExceptionHandlers();
255:                    for (int s = 0; s < exc_hds.length; s++) {
256:                        InstructionContext v = cfg.contextOf(exc_hds[s]
257:                                .getHandlerStart());
258:                        // TODO: the "oldchain" and "newchain" is used to determine the
259:                        // subroutine
260:                        // we're in (by searching for the last JSR) by the
261:                        // InstructionContext
262:                        // implementation. Therefore, we should not use this chain
263:                        // mechanism
264:                        // when dealing with exception handlers.
265:                        // Example: a JSR with an exception handler as its successor
266:                        // does not
267:                        // mean we're in a subroutine if we go to the exception handler.
268:                        // We should address this problem later; by now we simply "cut"
269:                        // the chain
270:                        // by using an empty chain for the exception handlers.
271:                        // if (v.execute(new Frame(u.getOutFrame(oldchain).getLocals(),
272:                        // new OperandStack (u.getOutFrame().getStack().maxStack(),
273:                        // (exc_hds[s].getExceptionType()==null? Type.THROWABLE :
274:                        // exc_hds[s].getExceptionType())) ), newchain), icv, ev){
275:                        // icq.add(v, (ArrayList) newchain.clone());
276:                        if (v.execute(new Frame(u.getOutFrame(oldchain)
277:                                .getLocals(), new OperandStack(u.getOutFrame(
278:                                oldchain).getStack().maxStack(), (exc_hds[s]
279:                                .getExceptionType() == null ? Type.THROWABLE
280:                                : exc_hds[s].getExceptionType()))),
281:                                new ArrayList(), icv, ev)) {
282:                            icq.add(v, new ArrayList());
283:                        }
284:                    }
285:
286:                }// while (!icq.isEmpty()) END
287:
288:                // InstructionHandle ih = start.getInstruction();
289:                // do{
290:                // if ((ih.getInstruction() instanceof ReturnInstruction) &&
291:                // (!(cfg.isDead(ih)))) {
292:                // InstructionContext ic = cfg.contextOf(ih);
293:                // Frame f = ic.getOutFrame(new ArrayList()); // TODO: This is buggy, we
294:                // check only the top-level return instructions this way. Maybe some
295:                // maniac returns from a method when in a subroutine?
296:                // LocalVariables lvs = f.getLocals();
297:                // for (int i=0; i<lvs.maxLocals(); i++){
298:                // if (lvs.get(i) instanceof UninitializedObjectType){
299:                // //this.addMessage("Warning: ReturnInstruction '"+ic+"' may leave
300:                // method with an uninitialized object in the local variables array
301:                // '"+lvs+"'.");
302:                // }
303:                // }
304:                // OperandStack os = f.getStack();
305:                // for (int i=0; i<os.size(); i++){
306:                // if (os.peek(i) instanceof UninitializedObjectType){
307:                // this.addMessage("Warning: ReturnInstruction '"+ic+"' may leave method
308:                // with an uninitialized object on the operand stack '"+os+"'.");
309:                // }
310:                // }
311:                // }
312:                // }while ((ih = ih.getNext()) != null);
313:
314:            }
315:
316:            /**
317:             * Pass 3b implements the data flow analysis as described in the Java
318:             * Virtual Machine Specification, Second Edition. Later versions will use
319:             * LocalVariablesInfo objects to verify if the verifier-inferred types and
320:             * the class file's debug information (LocalVariables attributes) match
321:             * [TODO].
322:             * 
323:             * @return TODO
324:             * 
325:             * @see org.apache.bcel.verifier.statics.LocalVariablesInfo
326:             * @see org.apache.bcel.verifier.statics.Pass2Verifier#getLocalVariablesInfo(int)
327:             */
328:            public VerificationResult do_verify() {
329:                ConstantPoolGen constantPoolGen = new ConstantPoolGen(jc
330:                        .getConstantPool());
331:                // Init Visitors
332:                InstConstraintVisitor icv = new InstConstraintVisitor();
333:                icv.setConstantPoolGen(constantPoolGen);
334:
335:                ExecutionVisitor ev = new ExecutionVisitor();
336:                ev.setConstantPoolGen(constantPoolGen);
337:
338:                Method[] methods = jc.getMethods(); // Method no "method_no" exists, we
339:                // ran Pass3a before on it!
340:
341:                try {
342:
343:                    MethodGen mg = new MethodGen(methods[method_no], jc
344:                            .getClassName(), constantPoolGen);
345:
346:                    icv.setMethodGen(mg);
347:
348:                    // //////////// DFA BEGINS HERE ////////////////
349:                    if (!(mg.isAbstract() || mg.isNative())) { // IF mg HAS CODE (See
350:                        // pass 2)
351:
352:                        ControlFlowGraph cfg = new ControlFlowGraph(mg);
353:
354:                        // Build the initial frame situation for this method.
355:                        Frame f = new Frame(mg.getMaxLocals(), mg.getMaxStack());
356:                        if (!mg.isStatic()) {
357:                            if (mg.getName().equals(Constants.CONSTRUCTOR_NAME)) {
358:                                Frame._this  = new UninitializedObjectType(
359:                                        new ObjectType(jc.getClassName()));
360:                                f.getLocals().set(0, Frame._this );
361:                            } else {
362:                                Frame._this  = null;
363:                                f.getLocals().set(0,
364:                                        new ObjectType(jc.getClassName()));
365:                            }
366:                        }
367:                        Type[] argtypes = mg.getArgumentTypes();
368:                        int twoslotoffset = 0;
369:                        for (int j = 0; j < argtypes.length; j++) {
370:                            if (argtypes[j] == Type.SHORT
371:                                    || argtypes[j] == Type.BYTE
372:                                    || argtypes[j] == Type.CHAR
373:                                    || argtypes[j] == Type.BOOLEAN) {
374:                                argtypes[j] = Type.INT;
375:                            }
376:                            f.getLocals()
377:                                    .set(
378:                                            twoslotoffset + j
379:                                                    + (mg.isStatic() ? 0 : 1),
380:                                            argtypes[j]);
381:                            if (argtypes[j].getSize() == 2) {
382:                                twoslotoffset++;
383:                                f.getLocals().set(
384:                                        twoslotoffset + j
385:                                                + (mg.isStatic() ? 0 : 1),
386:                                        Type.UNKNOWN);
387:                            }
388:                        }
389:                        circulationPump(cfg, cfg.contextOf(mg
390:                                .getInstructionList().getStart()), f, icv, ev);
391:                    }
392:                } catch (VerifierConstraintViolatedException ce) {
393:                    ce.extendMessage("Constraint violated in method '"
394:                            + methods[method_no] + "':\n", "");
395:                    return new VerificationResult(
396:                            VerificationResult.VERIFIED_REJECTED, ce
397:                                    .getMessage());
398:                } catch (RuntimeException re) {
399:                    // These are internal errors
400:
401:                    StringWriter sw = new StringWriter();
402:                    PrintWriter pw = new PrintWriter(sw);
403:                    re.printStackTrace(pw);
404:
405:                    throw new AssertionViolatedException(
406:                            "Some RuntimeException occured while verify()ing class '"
407:                                    + jc.getClassName()
408:                                    + "', method '"
409:                                    + methods[method_no]
410:                                    + "'. Original RuntimeException's stack trace:\n---\n"
411:                                    + sw + "---\n");
412:                }
413:                return VerificationResult.VR_OK;
414:            }
415:
416:            /**
417:             * Returns the method number as supplied when instantiating.
418:             * 
419:             * @return TODO
420:             */
421:            public int getMethodNo() {
422:                return method_no;
423:            }
424:        }
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