Source Code Cross Referenced for ClassEntry.java in  » 6.0-JDK-Modules » j2me » dependenceAnalyzer » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » dependenceAnalyzer 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)ClassEntry.java	1.27 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.  
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
006:         *   
007:         * This program is free software; you can redistribute it and/or  
008:         * modify it under the terms of the GNU General Public License version  
009:         * 2 only, as published by the Free Software Foundation.   
010:         *   
011:         * This program is distributed in the hope that it will be useful, but  
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of  
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
014:         * General Public License version 2 for more details (a copy is  
015:         * included at /legal/license.txt).   
016:         *   
017:         * You should have received a copy of the GNU General Public License  
018:         * version 2 along with this work; if not, write to the Free Software  
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
020:         * 02110-1301 USA   
021:         *   
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
023:         * Clara, CA 95054 or visit www.sun.com if you need additional  
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package dependenceAnalyzer;
029:
030:        import util.*;
031:        import java.util.*;
032:        import components.*;
033:        import consts.Const;
034:
035:        /*
036:         * Class ClassEntry is for use with Member-level dependence analysis.
037:         * It is not only a part of the dependence relations but also
038:         * a container for MemberDependenceNodes, and thus
039:         * a part of the naming mechanism.
040:         *
041:         * This is where class members are parsed, and thus
042:         * their dependences discovered and exposed.
043:         */
044:
045:        public class ClassEntry extends DependenceNode implements 
046:                MemberArcTypes {
047:            /*
048:             * public parts.
049:             */
050:            public boolean signatureFlag = false;
051:
052:            public ClassEntry super Class() {
053:                return super ClassEntry;
054:            }
055:
056:            public Enumeration subclasses() {
057:                return (subclassSet == null) ? EmptyEnumeration.instance
058:                        : subclassSet.elements();
059:            }
060:
061:            public Enumeration members() {
062:                return (memberSet == null) ? EmptyEnumeration.instance
063:                        : memberSet.elements();
064:            }
065:
066:            public Enumeration interfaces() {
067:                return (interfaceSet == null) ? EmptyEnumeration.instance
068:                        : interfaceSet.elements();
069:            }
070:
071:            public MemberDependenceNode lookupMember(MemberName mn) {
072:                if (memberSet == null)
073:                    return null;
074:                return (MemberDependenceNode) (memberSet.get(mn));
075:            }
076:
077:            private MemberName t = new MemberName(this , "");
078:
079:            public MemberDependenceNode lookupMember(String mname) {
080:                // ... won't work multithreaded!...
081:                t.name = mname.intern();
082:                return lookupMember(t);
083:            }
084:
085:            public MemberDependenceNode lookupAddMember(MemberName mn,
086:                    int mflags) {
087:                MemberDependenceNode mnode = lookupMember(mn);
088:                if (mnode == null) {
089:                    mnode = new MemberDependenceNode(mn, mflags);
090:                    if (memberSet == null)
091:                        memberSet = new Hashtable();
092:                    memberSet.put(mn, mnode);
093:                } else if (mflags != 0) {
094:                    mnode.flags = mflags;
095:                }
096:                if ((this .flags & EXCLUDED) != 0) {
097:                    // class is excluded, and so are all members.
098:                    mnode.flags |= MemberDependenceNode.EXCLUDED;
099:                }
100:
101:                return mnode;
102:            }
103:
104:            public ClassEntry(String name) {
105:                super (name);
106:                className = name;
107:                nodeState = UNANALYZED;
108:            }
109:
110:            public boolean analyzeClass(ClassDictionary cd, boolean f) {
111:                signatureFlag = f;
112:                return (analyzeClass(cd));
113:            }
114:
115:            public boolean analyzeClass(ClassDictionary cd) {
116:                if (nodeState != UNANALYZED)
117:                    return (nodeState != ERROR); // already done.
118:                nodeState = ANALYZED; // do this early to prevent excess recursion
119:                cdict = cd; // share the dictionary with the rest of the code.
120:
121:                ClassInfo ci = cdict.findClassInfo(className);
122:                if (ci == null) {
123:                    // cannot find class info to analyze.
124:                    // this is not good.
125:                    nodeState = ERROR;
126:                } else {
127:                    nodeState = parseClassInfo(ci);
128:                }
129:                return (nodeState != ERROR);
130:            }
131:
132:            /*
133:             * A class which is marked as an interface does not have to be
134:             * a Java TM Interface. It merely has to define a contract between
135:             * two software subsystems. java.applet.Applet is a good example of
136:             * an interface.
137:             * An interface is always EXCLUDED.
138:             * An interface has additional, imputed, members, which
139:             * are inhereted from superclasses and interfaces, and which
140:             * form part of the contract. makeInterface creates these after
141:             * inspecting all superclasses and Java interfaces. This is so that
142:             * our override-based dependence analysis works.
143:             * makeInterface returns true on success, false on any adversary
144:             * Adversary includes:
145:             *	inability to find class file
146:             *  class is not EXCLUDED
147:             *  inability to find superclasses or interfaces
148:             */
149:            public boolean makeInterface(ClassDictionary cd) {
150:                cdict = cd;
151:                if (nodeState == UNANALYZED)
152:                    analyzeClass(cd);
153:                if (nodeState == ERROR)
154:                    return false;
155:                if ((flags & EXCLUDED) == 0)
156:                    return false;
157:                if ((flags & DEFINES_INTERFACE) != 0)
158:                    return true; // done!
159:                if (!imputeMembers(super ClassEntry))
160:                    return false;
161:                if (interfaceSet != null) {
162:                    Enumeration ilist = interfaceSet.elements();
163:                    while (ilist.hasMoreElements()) {
164:                        if (!imputeMembers((ClassEntry) (ilist.nextElement())))
165:                            return false;
166:                    }
167:                }
168:                flags |= DEFINES_INTERFACE;
169:                return true;
170:            }
171:
172:            /*
173:             * Flags. This is pretty much up to the user, except for this one
174:             * which will govern how things work.
175:             */
176:            public static final int EXCLUDED = MemberDependenceNode.EXCLUDED;
177:            public static final int DEFINES_INTERFACE = 2;
178:            public static final int HAS_OVERRIDING = 4;
179:
180:            /*
181:             * Implementation parts.
182:             */
183:            private String className;
184:            private ClassEntry super ClassEntry;
185:            private Vector subclassSet;
186:            private Dictionary memberSet;
187:            private Vector interfaceSet = new Vector();
188:
189:            // 
190:            // I feel rather silly having this here, as there is
191:            // no requirement that a ClassEntry be associated with only
192:            // one dictionary. But the fact is, this variable is
193:            // referenced in many many places in the analysis routines,
194:            // and I'd otherwise have to keep passing it around...
195:            private ClassDictionary cdict;
196:
197:            private int parseClassInfo(ClassInfo ci) {
198:                //
199:                // This class cannot be understood without
200:                // first understanding its super class
201:                //
202:                int resultState = ANALYZED;
203:
204:                if (ci.super Class != null) {
205:                    ClassEntry sup = cdict.lookupAdd(ci.super Class.name.string);
206:                    if (sup.nodeState == UNANALYZED)
207:                        sup.analyzeClass(cdict); // recurse.
208:                    if (sup.nodeState != ERROR) {
209:                        super ClassEntry = sup;
210:                        sup.addSubclass(this );
211:                    }
212:                }
213:
214:                // interfaces, if any.
215:                if (ci.interfaces != null) {
216:                    for (int i = 0; i < ci.interfaces.length; i++) {
217:                        ClassEntry sup = cdict
218:                                .lookupAdd(ci.interfaces[i].name.string);
219:                        interfaceSet.addElement(sup);
220:                        sup.addSubclass(this );
221:                        if (sup.nodeState == UNANALYZED)
222:                            sup.analyzeClass(cdict); // recurse.
223:                    }
224:                }
225:
226:                // Take Care the Inner class as well.
227:                if (ci.classAttributes != null) {
228:                    for (int i = 0; i < ci.classAttributes.length; i++) {
229:                        if (ci.classAttributes[i].name.string
230:                                .equals("InnerClasses")) {
231:                            for (int j = 0; j < ci.innerClassAttr
232:                                    .getInnerClassCount(); j++) {
233:                                String name = ci.innerClassAttr.getFullName(j);
234:                                if (name.equals("ICA-ReferingToSelf"))
235:                                    continue;
236:
237:                                ClassEntry inner = cdict.lookupAdd(name);
238:                                if (inner.nodeState == UNANALYZED)
239:                                    // if -signatureFlag is set, get api dependency as well.
240:                                    inner.analyzeClass(cdict, signatureFlag); // recurse.
241:                            }
242:                        }
243:                    }
244:                }
245:
246:                MemberDependenceNode mnode;
247:
248:                // all the methods.
249:                if (ci.methods != null) {
250:                    for (int i = 0; i < ci.methods.length; i++) {
251:                        mnode = overrideAnalysis(parseMethodInfo(ci.methods[i]));
252:                        if (mnode == null) {
253:                            resultState = ERROR; // bad news.
254:                        } else {
255:                            mnode.nodeState = DependenceNode.ANALYZED;
256:                        }
257:                    }
258:                }
259:
260:                // and the fields.
261:                if (ci.fields != null) {
262:                    for (int i = 0; i < ci.fields.length; i++) {
263:                        mnode = parseFieldInfo(ci.fields[i]);
264:                        if (mnode == null) {
265:                            resultState = ERROR; // bad news.
266:                        } else {
267:                            mnode.nodeState = DependenceNode.ANALYZED;
268:                        }
269:                    }
270:                }
271:
272:                return resultState;
273:            }
274:
275:            private MemberDependenceNode overrideAnalysis(
276:                    MemberDependenceNode mn) {
277:                if (mn == null)
278:                    return null; // must have been some error
279:                if ((mn.flags & MemberDependenceNode.NO_OVERRIDING) != 0)
280:                    return mn; // these don't override.
281:                MemberName nm = (MemberName) ((MemberName) (mn.name())).clone(); // make a dirty copy.
282:                int anyOverriding = 0;
283:                if (super ClassEntry != null)
284:                    anyOverriding += super ClassEntry.overrideCheckUp(mn, nm);
285:                Enumeration ife = interfaceSet.elements();
286:                while (ife.hasMoreElements()) {
287:                    ClassEntry iface = (ClassEntry) (ife.nextElement());
288:                    anyOverriding += iface.overrideCheckUp(mn, nm);
289:                }
290:                if (anyOverriding != 0) {
291:                    this .flags |= HAS_OVERRIDING;
292:                }
293:                return mn;
294:            }
295:
296:            private int overrideCheckUp(MemberDependenceNode mn,
297:                    MemberName nameCopy) {
298:
299:                if (this .nodeState != ANALYZED)
300:                    return 0; // error or unanalyzed interface
301:
302:                int nOverrides = 0;
303:
304:                nameCopy.classEntry = this ;
305:                MemberDependenceNode target = lookupMember(nameCopy);
306:                if (target != null) {
307:                    // have a case of overriding.
308:                    // various sets may not exist yet, so be careful.
309:                    if (target.memberOverriddenBy == null) {
310:                        target.memberOverriddenBy = new util.Set();
311:                    }
312:                    target.memberOverriddenBy.addElement(mn);
313:                    target.flags |= MemberDependenceNode.OVERRIDDEN;
314:                    if (mn.memberOverrides == null) {
315:                        mn.memberOverrides = new util.Set();
316:                    }
317:                    mn.memberOverrides.addElement(target);
318:                    nOverrides += 1;
319:                }
320:                if (super ClassEntry != null)
321:                    nOverrides += super ClassEntry.overrideCheckUp(mn, nameCopy);
322:                Enumeration ife = interfaceSet.elements();
323:                while (ife.hasMoreElements()) {
324:                    ClassEntry iface = (ClassEntry) (ife.nextElement());
325:                    nOverrides += iface.overrideCheckUp(mn, nameCopy);
326:                }
327:
328:                return nOverrides;
329:            }
330:
331:            private static int getUnsignedShort(byte code[], int w) {
332:                return (((int) code[w] & 0xff) << 8)
333:                        | ((int) code[w + 1] & 0xff);
334:            }
335:
336:            private ClassEntry conditionalClassReference(
337:                    MemberDependenceNode referring, ClassConstant ref,
338:                    int referenceType) {
339:                String classname = ref.name.string;
340:                if (className.equals(classname)) {
341:                    return this ;
342:                }
343:                ClassEntry cer = cdict.lookupAdd(classname);
344:                DependenceArc de = new DependenceArc(referring, cer,
345:                        referenceType);
346:                referring.nodeDependsOn.addElement(de);
347:                cer.nodeDependedOn.addElement(de);
348:                return cer;
349:            }
350:
351:            private void addCrossReference(MemberDependenceNode referring,
352:                    FMIrefConstant fref, int arctype) {
353:                ClassEntry targetClass = conditionalClassReference(referring,
354:                        fref.clas, ARC_CLASS);
355:                String refname;
356:                if (arctype == ARC_CALLS) {
357:                    // for methods, name includes signature.
358:                    refname = fref.sig.name.string + fref.sig.type.string;
359:                } else {
360:                    // for data, name is just name.
361:                    refname = fref.sig.name.string;
362:                }
363:                MemberDependenceNode targetNode = targetClass.lookupAddMember(
364:                        new MemberName(targetClass, refname), 0);
365:                DependenceArc de = new DependenceArc(referring, targetNode,
366:                        arctype);
367:                referring.nodeDependsOn.addElement(de);
368:                targetNode.nodeDependedOn.addElement(de);
369:            }
370:
371:            private ClassEntry javaLangString;
372:            private MemberDependenceNode stringInit;
373:
374:            private void makeString(MemberDependenceNode referring) {
375:                if (javaLangString == null) {
376:                    javaLangString = cdict.lookupAdd("java/lang/String");
377:                    stringInit = javaLangString.lookupAddMember(new MemberName(
378:                            javaLangString, "<init>([C)V"), 0);
379:                }
380:                DependenceArc da = new DependenceArc(referring, stringInit,
381:                        ARC_CALLS);
382:                referring.nodeDependsOn.addElement(da);
383:                stringInit.nodeDependedOn.addElement(da);
384:            }
385:
386:            private void doSignatureDepend(String str,
387:                    MemberDependenceNode referring) {
388:                ParamSignatureParser csi;
389:
390:                csi = new ParamSignatureParser(str, referring);
391:                try {
392:                    csi.iterate();
393:                } catch (util.DataFormatException e) {
394:                    e.printStackTrace();
395:                }
396:            }
397:
398:            private MemberDependenceNode parseMethodInfo(MethodInfo mi) {
399:
400:                MemberDependenceNode md = parseClassMemberInfo(mi,
401:                        MemberDependenceNode.METHOD);
402:
403:                if ((md.flags & MemberDependenceNode.EXCLUDED) != 0) {
404:                    return md; // we have all we need.
405:                }
406:
407:                /* Should set an option -listSignatureDepend to turn this on. how??  */
408:                if (signatureFlag)
409:                    doSignatureDepend(mi.type.string, md);
410:
411:                if (mi.exceptionTable != null) {
412:                    for (int j = 0; j < mi.exceptionTable.length; j++) {
413:                        ExceptionEntry ee = mi.exceptionTable[j];
414:                        if (ee.catchType != null)
415:                            conditionalClassReference(md, ee.catchType,
416:                                    ARC_EXCEPTION);
417:                    }
418:                }
419:                if (mi.exceptionsThrown != null) {
420:                    for (int j = 0; j < mi.exceptionsThrown.length; j++) {
421:                        conditionalClassReference(md, mi.exceptionsThrown[j],
422:                                ARC_EXCEPTION);
423:                    }
424:                }
425:                doCode: if (mi.code != null) {
426:                    byte code[] = mi.code;
427:                    try {
428:                        int locs[] = mi.getLdcInstructions();
429:                        ConstantObject cpool[] = mi.parent.getConstantPool()
430:                                .getConstants();
431:
432:                        for (int j = 0; j < locs.length; j++) {
433:                            ConstantObject o = cpool[(int) code[locs[j] + 1] & 0xff];
434:                            if (o instanceof  StringConstant) {
435:                                makeString(md);
436:                            } else if (o instanceof  ClassConstant) {
437:                                conditionalClassReference(md,
438:                                        (ClassConstant) o, ARC_CLASS);
439:                            }
440:                        }
441:                        locs = mi.getWideConstantRefInstructions();
442:                        for (int j = 0; j < locs.length; j++) {
443:                            FMIrefConstant fref;
444:
445:                            switch ((int) code[locs[j]] & 0xff) {
446:                            case Const.opc_anewarray:
447:                            case Const.opc_checkcast:
448:                            case Const.opc_multianewarray:
449:                            case Const.opc_new:
450:                            case Const.opc_instanceof : {
451:                                conditionalClassReference(md,
452:                                        (ClassConstant) cpool[getUnsignedShort(
453:                                                code, locs[j] + 1)], ARC_CLASS);
454:                                break;
455:                            }
456:                            case Const.opc_getfield:
457:                            case Const.opc_getstatic:
458:                                fref = (FMIrefConstant) cpool[getUnsignedShort(
459:                                        code, locs[j] + 1)];
460:                                addCrossReference(md, fref, ARC_READS);
461:                                break;
462:                            case Const.opc_putfield:
463:                            case Const.opc_putstatic: {
464:                                fref = (FMIrefConstant) cpool[getUnsignedShort(
465:                                        code, locs[j] + 1)];
466:                                addCrossReference(md, fref, ARC_WRITES);
467:                                break;
468:                            }
469:                            case Const.opc_ldc_w: {
470:                                ConstantObject o = cpool[getUnsignedShort(code,
471:                                        locs[j] + 1)];
472:                                if (o instanceof  StringConstant) {
473:                                    makeString(md);
474:                                } else if (o instanceof  ClassConstant) {
475:                                    conditionalClassReference(md,
476:                                            (ClassConstant) o, ARC_CLASS);
477:                                }
478:                                break;
479:                            }
480:                            case Const.opc_invokeinterface:
481:                            case Const.opc_invokevirtual:
482:                            case Const.opc_invokespecial:
483:                            case Const.opc_invokestatic:
484:                                fref = (FMIrefConstant) cpool[getUnsignedShort(
485:                                        code, locs[j] + 1)];
486:                                addCrossReference(md, fref, ARC_CALLS);
487:                                break;
488:                            }
489:                        }
490:                    } catch (Exception e) {
491:                        System.out.println(this );
492:                        e.printStackTrace();
493:                        break doCode;
494:                    }
495:                }
496:                return md;
497:            }
498:
499:            private MemberDependenceNode parseFieldInfo(FieldInfo fi) {
500:                return parseClassMemberInfo(fi, MemberDependenceNode.FIELD);
501:            }
502:
503:            private MemberDependenceNode parseClassMemberInfo(
504:                    ClassMemberInfo mi, int flagval) {
505:                boolean isStatic = (mi.isStaticMember())
506:                        || (mi.name.string.charAt(0) == '<');
507:
508:                if (isStatic)
509:                    flagval |= MemberDependenceNode.STATIC;
510:                if (mi.isPrivateMember())
511:                    flagval |= MemberDependenceNode.PRIVATE;
512:                if (mi.name.string.equals("<init>"))
513:                    flagval |= MemberDependenceNode.INIT;
514:                if (mi.name.string.equals("<clinit>"))
515:                    flagval |= MemberDependenceNode.CLINIT;
516:                if ((mi.access & Const.ACC_NATIVE) != 0)
517:                    flagval |= MemberDependenceNode.NATIVE;
518:
519:                String memberName = mi.name.string;
520:                if ((flagval & MemberDependenceNode.METHOD) != 0)
521:                    memberName += mi.type.string;
522:                return lookupAddMember(new MemberName(this , memberName),
523:                        flagval);
524:            }
525:
526:            private boolean imputeMembers(ClassEntry other) {
527:                if (other == null)
528:                    return true; // vacuous
529:                if (other.nodeState == UNANALYZED)
530:                    other.analyzeClass(cdict);
531:                if (other.nodeState == ERROR)
532:                    return false;
533:                if (other.memberSet != null) {
534:                    Enumeration omembers = other.memberSet.elements();
535:                    while (omembers.hasMoreElements()) {
536:                        MemberDependenceNode mn = (MemberDependenceNode) (omembers
537:                                .nextElement());
538:                        if ((mn.flags & MemberDependenceNode.NO_OVERRIDING) != 0)
539:                            continue; // never mind. Not part of interface.
540:                        MemberName tname = (MemberName) (((MemberName) (mn
541:                                .name())).clone());
542:                        tname.classEntry = this ;
543:                        MemberDependenceNode ourmn = lookupAddMember(tname, 0);
544:                        if ((ourmn.flags & ~EXCLUDED) == 0) {
545:                            // no flags set. That means that we just inserted it.
546:                            ourmn.flags |= mn.flags
547:                                    | MemberDependenceNode.IMPUTED;
548:                        }
549:                    }
550:                }
551:                if (!imputeMembers(other.super ClassEntry))
552:                    return false;
553:                if (other.interfaceSet != null) {
554:                    Enumeration ilist = other.interfaceSet.elements();
555:                    while (ilist.hasMoreElements()) {
556:                        if (!imputeMembers((ClassEntry) (ilist.nextElement())))
557:                            return false;
558:                    }
559:                }
560:                return true;
561:            }
562:
563:            private void addSubclass(ClassEntry newSub) {
564:                if (subclassSet == null) {
565:                    subclassSet = new Vector();
566:                }
567:                subclassSet.addElement(newSub);
568:            }
569:
570:            private boolean hasSubclass(ClassEntry other) {
571:                if (subclassSet == null)
572:                    return false;
573:                Enumeration subs = subclassSet.elements();
574:                while (subs.hasMoreElements()) {
575:                    if (subs.nextElement() == other)
576:                        return true;
577:                }
578:                subs = subclassSet.elements();
579:                while (subs.hasMoreElements()) {
580:                    if (((ClassEntry) (subs.nextElement())).hasSubclass(other))
581:                        return true;
582:                }
583:                return false;
584:            }
585:
586:            class ParamSignatureParser extends util.SignatureIterator {
587:                String params[];
588:                MemberDependenceNode ref;
589:
590:                public ParamSignatureParser(String sig, MemberDependenceNode r) {
591:                    super (sig);
592:                    ref = r;
593:                }
594:
595:                public void do_array(int arrayDepth, int subTypeStart,
596:                        int subTypeEnd) {
597:                    ClassEntry cer;
598:                    DependenceArc da;
599:
600:                    if (subTypeStart == subTypeEnd)
601:                        return;
602:
603:                    cer = cdict.lookupAdd(sig.substring(subTypeStart + 1,
604:                            subTypeEnd));
605:                    da = new DependenceArc(ref, cer, ARC_CLASS);
606:                    ref.nodeDependsOn.addElement(da);
607:                    cer.nodeDependedOn.addElement(da);
608:                }
609:
610:                public void do_object(int subTypeStart, int subTypeEnd) {
611:                    ClassEntry cer;
612:                    DependenceArc da;
613:
614:                    cer = cdict.lookupAdd(sig.substring(subTypeStart + 1,
615:                            subTypeEnd));
616:                    da = new DependenceArc(ref, cer, ARC_CLASS);
617:                    ref.nodeDependsOn.addElement(da);
618:                    cer.nodeDependedOn.addElement(da);
619:                }
620:
621:            }
622:
623:        }
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