Source Code Cross Referenced for LoopingFlowContext.java in  » IDE-Eclipse » jdt » org » eclipse » jdt » internal » compiler » flow » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Eclipse » jdt » org.eclipse.jdt.internal.compiler.flow 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*******************************************************************************
002:         * Copyright (c) 2000, 2007 IBM Corporation and others.
003:         * All rights reserved. This program and the accompanying materials
004:         * are made available under the terms of the Eclipse Public License v1.0
005:         * which accompanies this distribution, and is available at
006:         * http://www.eclipse.org/legal/epl-v10.html
007:         *
008:         * Contributors:
009:         *     IBM Corporation - initial API and implementation
010:         *******************************************************************************/package org.eclipse.jdt.internal.compiler.flow;
011:
012:        import org.eclipse.jdt.internal.compiler.ast.ASTNode;
013:        import org.eclipse.jdt.internal.compiler.ast.Expression;
014:        import org.eclipse.jdt.internal.compiler.ast.Reference;
015:        import org.eclipse.jdt.internal.compiler.codegen.BranchLabel;
016:        import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
017:        import org.eclipse.jdt.internal.compiler.lookup.FieldBinding;
018:        import org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;
019:        import org.eclipse.jdt.internal.compiler.lookup.Scope;
020:        import org.eclipse.jdt.internal.compiler.lookup.VariableBinding;
021:
022:        /**
023:         * Reflects the context of code analysis, keeping track of enclosing
024:         *	try statements, exception handlers, etc...
025:         */
026:        public class LoopingFlowContext extends SwitchFlowContext {
027:
028:            public BranchLabel continueLabel;
029:            public UnconditionalFlowInfo initsOnContinue = FlowInfo.DEAD_END;
030:            private UnconditionalFlowInfo upstreamNullFlowInfo;
031:            private LoopingFlowContext innerFlowContexts[] = null;
032:            private UnconditionalFlowInfo innerFlowInfos[] = null;
033:            private int innerFlowContextsCount = 0;
034:            private LabelFlowContext breakTargetContexts[] = null;
035:            private int breakTargetsCount = 0;
036:
037:            Reference finalAssignments[];
038:            VariableBinding finalVariables[];
039:            int assignCount = 0;
040:
041:            LocalVariableBinding[] nullLocals;
042:            Expression[] nullReferences;
043:            int[] nullCheckTypes;
044:            int nullCount;
045:
046:            Scope associatedScope;
047:
048:            public LoopingFlowContext(FlowContext parent,
049:                    FlowInfo upstreamNullFlowInfo, ASTNode associatedNode,
050:                    BranchLabel breakLabel, BranchLabel continueLabel,
051:                    Scope associatedScope) {
052:                super (parent, associatedNode, breakLabel);
053:                preemptNullDiagnostic = true;
054:                // children will defer to this, which may defer to its own parent 
055:                this .continueLabel = continueLabel;
056:                this .associatedScope = associatedScope;
057:                this .upstreamNullFlowInfo = upstreamNullFlowInfo
058:                        .unconditionalCopy();
059:            }
060:
061:            /**
062:             * Perform deferred checks relative to final variables duplicate initialization 
063:             * of lack of initialization.
064:             * @param scope the scope to which this context is associated
065:             * @param flowInfo the flow info against which checks must be performed
066:             */
067:            public void complainOnDeferredFinalChecks(BlockScope scope,
068:                    FlowInfo flowInfo) {
069:                // complain on final assignments in loops
070:                for (int i = 0; i < assignCount; i++) {
071:                    VariableBinding variable = finalVariables[i];
072:                    if (variable == null)
073:                        continue;
074:                    boolean complained = false; // remember if have complained on this final assignment
075:                    if (variable instanceof  FieldBinding) {
076:                        if (flowInfo
077:                                .isPotentiallyAssigned((FieldBinding) variable)) {
078:                            complained = true;
079:                            scope.problemReporter()
080:                                    .duplicateInitializationOfBlankFinalField(
081:                                            (FieldBinding) variable,
082:                                            finalAssignments[i]);
083:                        }
084:                    } else {
085:                        if (flowInfo
086:                                .isPotentiallyAssigned((LocalVariableBinding) variable)) {
087:                            complained = true;
088:                            scope.problemReporter()
089:                                    .duplicateInitializationOfFinalLocal(
090:                                            (LocalVariableBinding) variable,
091:                                            finalAssignments[i]);
092:                        }
093:                    }
094:                    // any reference reported at this level is removed from the parent context where it 
095:                    // could also be reported again
096:                    if (complained) {
097:                        FlowContext context = parent;
098:                        while (context != null) {
099:                            context
100:                                    .removeFinalAssignmentIfAny(finalAssignments[i]);
101:                            context = context.parent;
102:                        }
103:                    }
104:                }
105:            }
106:
107:            /**
108:             * Perform deferred checks relative to the null status of local variables.
109:             * @param scope the scope to which this context is associated
110:             * @param callerFlowInfo the flow info against which checks must be performed
111:             */
112:            public void complainOnDeferredNullChecks(BlockScope scope,
113:                    FlowInfo callerFlowInfo) {
114:                for (int i = 0; i < this .innerFlowContextsCount; i++) {
115:                    this .upstreamNullFlowInfo.addPotentialNullInfoFrom(
116:                            this .innerFlowContexts[i].upstreamNullFlowInfo)
117:                            .addPotentialNullInfoFrom(this .innerFlowInfos[i]);
118:                }
119:                this .innerFlowContextsCount = 0;
120:                UnconditionalFlowInfo flowInfo = this .upstreamNullFlowInfo
121:                        .addPotentialNullInfoFrom(callerFlowInfo
122:                                .unconditionalInitsWithoutSideEffect());
123:                if (this .deferNullDiagnostic) {
124:                    // check only immutable null checks on innermost looping context
125:                    for (int i = 0; i < this .nullCount; i++) {
126:                        LocalVariableBinding local = this .nullLocals[i];
127:                        Expression expression = this .nullReferences[i];
128:                        // final local variable
129:                        switch (this .nullCheckTypes[i]) {
130:                        case CAN_ONLY_NON_NULL | IN_COMPARISON_NULL:
131:                        case CAN_ONLY_NON_NULL | IN_COMPARISON_NON_NULL:
132:                            if (flowInfo.isDefinitelyNonNull(local)) {
133:                                this .nullReferences[i] = null;
134:                                if (this .nullCheckTypes[i] == (CAN_ONLY_NON_NULL | IN_COMPARISON_NON_NULL)) {
135:                                    scope
136:                                            .problemReporter()
137:                                            .localVariableRedundantCheckOnNonNull(
138:                                                    local, expression);
139:                                } else {
140:                                    scope
141:                                            .problemReporter()
142:                                            .localVariableNonNullComparedToNull(
143:                                                    local, expression);
144:                                }
145:                                continue;
146:                            }
147:                            break;
148:                        case CAN_ONLY_NULL_NON_NULL | IN_COMPARISON_NULL:
149:                        case CAN_ONLY_NULL_NON_NULL | IN_COMPARISON_NON_NULL:
150:                            if (flowInfo.isDefinitelyNonNull(local)) {
151:                                this .nullReferences[i] = null;
152:                                if (this .nullCheckTypes[i] == (CAN_ONLY_NULL_NON_NULL | IN_COMPARISON_NON_NULL)) {
153:                                    scope
154:                                            .problemReporter()
155:                                            .localVariableRedundantCheckOnNonNull(
156:                                                    local, expression);
157:                                } else {
158:                                    scope
159:                                            .problemReporter()
160:                                            .localVariableNonNullComparedToNull(
161:                                                    local, expression);
162:                                }
163:                                continue;
164:                            }
165:                            if (flowInfo.isDefinitelyNull(local)) {
166:                                this .nullReferences[i] = null;
167:                                if (this .nullCheckTypes[i] == (CAN_ONLY_NULL_NON_NULL | IN_COMPARISON_NULL)) {
168:                                    scope.problemReporter()
169:                                            .localVariableRedundantCheckOnNull(
170:                                                    local, expression);
171:                                } else {
172:                                    scope
173:                                            .problemReporter()
174:                                            .localVariableNullComparedToNonNull(
175:                                                    local, expression);
176:                                }
177:                                continue;
178:                            }
179:                            break;
180:                        case CAN_ONLY_NULL | IN_COMPARISON_NULL:
181:                        case CAN_ONLY_NULL | IN_COMPARISON_NON_NULL:
182:                        case CAN_ONLY_NULL | IN_ASSIGNMENT:
183:                        case CAN_ONLY_NULL | IN_INSTANCEOF:
184:                            if (flowInfo.isDefinitelyNull(local)) {
185:                                this .nullReferences[i] = null;
186:                                switch (this .nullCheckTypes[i] & CONTEXT_MASK) {
187:                                case FlowContext.IN_COMPARISON_NULL:
188:                                    scope.problemReporter()
189:                                            .localVariableRedundantCheckOnNull(
190:                                                    local, expression);
191:                                    continue;
192:                                case FlowContext.IN_COMPARISON_NON_NULL:
193:                                    scope
194:                                            .problemReporter()
195:                                            .localVariableNullComparedToNonNull(
196:                                                    local, expression);
197:                                    continue;
198:                                case FlowContext.IN_ASSIGNMENT:
199:                                    scope
200:                                            .problemReporter()
201:                                            .localVariableRedundantNullAssignment(
202:                                                    local, expression);
203:                                    continue;
204:                                case FlowContext.IN_INSTANCEOF:
205:                                    scope.problemReporter()
206:                                            .localVariableNullInstanceof(local,
207:                                                    expression);
208:                                    continue;
209:                                }
210:                            }
211:                            break;
212:                        case MAY_NULL:
213:                            if (flowInfo.isDefinitelyNull(local)) {
214:                                this .nullReferences[i] = null;
215:                                scope.problemReporter()
216:                                        .localVariableNullReference(local,
217:                                                expression);
218:                                continue;
219:                            }
220:                            break;
221:                        default:
222:                            // never happens	
223:                        }
224:                        this .parent.recordUsingNullReference(scope, local,
225:                                expression, this .nullCheckTypes[i], flowInfo);
226:                    }
227:                } else {
228:                    // check inconsistent null checks on outermost looping context
229:                    for (int i = 0; i < this .nullCount; i++) {
230:                        Expression expression = this .nullReferences[i];
231:                        // final local variable
232:                        LocalVariableBinding local = this .nullLocals[i];
233:                        switch (this .nullCheckTypes[i]) {
234:                        case CAN_ONLY_NULL_NON_NULL | IN_COMPARISON_NULL:
235:                        case CAN_ONLY_NULL_NON_NULL | IN_COMPARISON_NON_NULL:
236:                            if (flowInfo.isDefinitelyNonNull(local)) {
237:                                this .nullReferences[i] = null;
238:                                if (this .nullCheckTypes[i] == (CAN_ONLY_NULL_NON_NULL | IN_COMPARISON_NON_NULL)) {
239:                                    scope
240:                                            .problemReporter()
241:                                            .localVariableRedundantCheckOnNonNull(
242:                                                    local, expression);
243:                                } else {
244:                                    scope
245:                                            .problemReporter()
246:                                            .localVariableNonNullComparedToNull(
247:                                                    local, expression);
248:                                }
249:                                continue;
250:                            }
251:                        case CAN_ONLY_NULL | IN_COMPARISON_NULL:
252:                        case CAN_ONLY_NULL | IN_COMPARISON_NON_NULL:
253:                        case CAN_ONLY_NULL | IN_ASSIGNMENT:
254:                        case CAN_ONLY_NULL | IN_INSTANCEOF:
255:                            if (flowInfo.isDefinitelyNull(local)) {
256:                                this .nullReferences[i] = null;
257:                                switch (this .nullCheckTypes[i] & CONTEXT_MASK) {
258:                                case FlowContext.IN_COMPARISON_NULL:
259:                                    scope.problemReporter()
260:                                            .localVariableRedundantCheckOnNull(
261:                                                    local, expression);
262:                                    continue;
263:                                case FlowContext.IN_COMPARISON_NON_NULL:
264:                                    scope
265:                                            .problemReporter()
266:                                            .localVariableNullComparedToNonNull(
267:                                                    local, expression);
268:                                    continue;
269:                                case FlowContext.IN_ASSIGNMENT:
270:                                    scope
271:                                            .problemReporter()
272:                                            .localVariableRedundantNullAssignment(
273:                                                    local, expression);
274:                                    continue;
275:                                case FlowContext.IN_INSTANCEOF:
276:                                    scope.problemReporter()
277:                                            .localVariableNullInstanceof(local,
278:                                                    expression);
279:                                    continue;
280:                                }
281:                            }
282:                            break;
283:                        case MAY_NULL:
284:                            if (flowInfo.isDefinitelyNull(local)) {
285:                                this .nullReferences[i] = null;
286:                                scope.problemReporter()
287:                                        .localVariableNullReference(local,
288:                                                expression);
289:                                continue;
290:                            }
291:                            if (flowInfo.isPotentiallyNull(local)) {
292:                                this .nullReferences[i] = null;
293:                                scope.problemReporter()
294:                                        .localVariablePotentialNullReference(
295:                                                local, expression);
296:                                continue;
297:                            }
298:                            break;
299:                        default:
300:                            // never happens	
301:                        }
302:                    }
303:                }
304:                // propagate breaks
305:                this .initsOnBreak.addPotentialNullInfoFrom(flowInfo);
306:                for (int i = 0; i < this .breakTargetsCount; i++) {
307:                    this .breakTargetContexts[i].initsOnBreak
308:                            .addPotentialNullInfoFrom(flowInfo);
309:                }
310:            }
311:
312:            public BranchLabel continueLabel() {
313:                return continueLabel;
314:            }
315:
316:            public String individualToString() {
317:                StringBuffer buffer = new StringBuffer("Looping flow context"); //$NON-NLS-1$
318:                buffer
319:                        .append("[initsOnBreak - ").append(initsOnBreak.toString()).append(']'); //$NON-NLS-1$
320:                buffer
321:                        .append("[initsOnContinue - ").append(initsOnContinue.toString()).append(']'); //$NON-NLS-1$
322:                buffer
323:                        .append("[finalAssignments count - ").append(assignCount).append(']'); //$NON-NLS-1$
324:                buffer
325:                        .append("[nullReferences count - ").append(nullCount).append(']'); //$NON-NLS-1$
326:                return buffer.toString();
327:            }
328:
329:            public boolean isContinuable() {
330:                return true;
331:            }
332:
333:            public boolean isContinuedTo() {
334:                return initsOnContinue != FlowInfo.DEAD_END;
335:            }
336:
337:            public void recordBreakTo(FlowContext targetContext) {
338:                if (targetContext instanceof  LabelFlowContext) {
339:                    int current;
340:                    if ((current = this .breakTargetsCount++) == 0) {
341:                        this .breakTargetContexts = new LabelFlowContext[2];
342:                    } else if (current == this .breakTargetContexts.length) {
343:                        System
344:                                .arraycopy(
345:                                        this .breakTargetContexts,
346:                                        0,
347:                                        this .breakTargetContexts = new LabelFlowContext[current + 2],
348:                                        0, current);
349:                    }
350:                    this .breakTargetContexts[current] = (LabelFlowContext) targetContext;
351:                }
352:            }
353:
354:            public void recordContinueFrom(FlowContext innerFlowContext,
355:                    FlowInfo flowInfo) {
356:                if ((flowInfo.tagBits & FlowInfo.UNREACHABLE) == 0) {
357:                    if ((initsOnContinue.tagBits & FlowInfo.UNREACHABLE) == 0) {
358:                        initsOnContinue = initsOnContinue.mergedWith(flowInfo
359:                                .unconditionalInitsWithoutSideEffect());
360:                    } else {
361:                        initsOnContinue = flowInfo.unconditionalCopy();
362:                    }
363:                    FlowContext inner = innerFlowContext;
364:                    while (inner != this 
365:                            && !(inner instanceof  LoopingFlowContext)) {
366:                        inner = inner.parent;
367:                    }
368:                    if (inner == this ) {
369:                        this .upstreamNullFlowInfo
370:                                .addPotentialNullInfoFrom(flowInfo
371:                                        .unconditionalInitsWithoutSideEffect());
372:                    } else {
373:                        int length = 0;
374:                        if (this .innerFlowContexts == null) {
375:                            this .innerFlowContexts = new LoopingFlowContext[5];
376:                            this .innerFlowInfos = new UnconditionalFlowInfo[5];
377:                        } else if (this .innerFlowContextsCount == (length = this .innerFlowContexts.length) - 1) {
378:                            System
379:                                    .arraycopy(
380:                                            this .innerFlowContexts,
381:                                            0,
382:                                            (this .innerFlowContexts = new LoopingFlowContext[length + 5]),
383:                                            0, length);
384:                            System
385:                                    .arraycopy(
386:                                            this .innerFlowInfos,
387:                                            0,
388:                                            (this .innerFlowInfos = new UnconditionalFlowInfo[length + 5]),
389:                                            0, length);
390:                        }
391:                        this .innerFlowContexts[this .innerFlowContextsCount] = (LoopingFlowContext) inner;
392:                        this .innerFlowInfos[this .innerFlowContextsCount++] = flowInfo
393:                                .unconditionalInitsWithoutSideEffect();
394:                    }
395:                }
396:            }
397:
398:            protected boolean recordFinalAssignment(VariableBinding binding,
399:                    Reference finalAssignment) {
400:
401:                // do not consider variables which are defined inside this loop
402:                if (binding instanceof  LocalVariableBinding) {
403:                    Scope scope = ((LocalVariableBinding) binding).declaringScope;
404:                    while ((scope = scope.parent) != null) {
405:                        if (scope == associatedScope)
406:                            return false;
407:                    }
408:                }
409:                if (assignCount == 0) {
410:                    finalAssignments = new Reference[5];
411:                    finalVariables = new VariableBinding[5];
412:                } else {
413:                    if (assignCount == finalAssignments.length)
414:                        System
415:                                .arraycopy(
416:                                        finalAssignments,
417:                                        0,
418:                                        (finalAssignments = new Reference[assignCount * 2]),
419:                                        0, assignCount);
420:                    System
421:                            .arraycopy(
422:                                    finalVariables,
423:                                    0,
424:                                    (finalVariables = new VariableBinding[assignCount * 2]),
425:                                    0, assignCount);
426:                }
427:                finalAssignments[assignCount] = finalAssignment;
428:                finalVariables[assignCount++] = binding;
429:                return true;
430:            }
431:
432:            protected void recordNullReference(LocalVariableBinding local,
433:                    Expression expression, int status) {
434:                if (nullCount == 0) {
435:                    nullLocals = new LocalVariableBinding[5];
436:                    nullReferences = new Expression[5];
437:                    nullCheckTypes = new int[5];
438:                } else if (nullCount == nullLocals.length) {
439:                    System
440:                            .arraycopy(
441:                                    nullLocals,
442:                                    0,
443:                                    nullLocals = new LocalVariableBinding[nullCount * 2],
444:                                    0, nullCount);
445:                    System.arraycopy(nullReferences, 0,
446:                            nullReferences = new Expression[nullCount * 2], 0,
447:                            nullCount);
448:                    System.arraycopy(nullCheckTypes, 0,
449:                            nullCheckTypes = new int[nullCount * 2], 0,
450:                            nullCount);
451:                }
452:                nullLocals[nullCount] = local;
453:                nullReferences[nullCount] = expression;
454:                nullCheckTypes[nullCount++] = status;
455:            }
456:
457:            public void recordUsingNullReference(Scope scope,
458:                    LocalVariableBinding local, Expression reference,
459:                    int checkType, FlowInfo flowInfo) {
460:                if ((flowInfo.tagBits & FlowInfo.UNREACHABLE) != 0
461:                        || flowInfo.isDefinitelyUnknown(local)) {
462:                    return;
463:                }
464:                switch (checkType) {
465:                case CAN_ONLY_NULL_NON_NULL | IN_COMPARISON_NULL:
466:                case CAN_ONLY_NULL_NON_NULL | IN_COMPARISON_NON_NULL:
467:                    if (flowInfo.isDefinitelyNonNull(local)) {
468:                        if (checkType == (CAN_ONLY_NULL_NON_NULL | IN_COMPARISON_NON_NULL)) {
469:                            scope.problemReporter()
470:                                    .localVariableRedundantCheckOnNonNull(
471:                                            local, reference);
472:                        } else {
473:                            scope.problemReporter()
474:                                    .localVariableNonNullComparedToNull(local,
475:                                            reference);
476:                        }
477:                    } else if (flowInfo.isDefinitelyNull(local)) {
478:                        if (checkType == (CAN_ONLY_NULL_NON_NULL | IN_COMPARISON_NULL)) {
479:                            scope.problemReporter()
480:                                    .localVariableRedundantCheckOnNull(local,
481:                                            reference);
482:                        } else {
483:                            scope.problemReporter()
484:                                    .localVariableNullComparedToNonNull(local,
485:                                            reference);
486:                        }
487:                    } else if (!flowInfo.cannotBeDefinitelyNullOrNonNull(local)) {
488:                        if (flowInfo.isPotentiallyNonNull(local)) {
489:                            recordNullReference(local, reference,
490:                                    CAN_ONLY_NON_NULL | checkType
491:                                            & CONTEXT_MASK);
492:                        } else {
493:                            recordNullReference(local, reference, checkType);
494:                        }
495:                    }
496:                    return;
497:                case CAN_ONLY_NULL | IN_COMPARISON_NULL:
498:                case CAN_ONLY_NULL | IN_COMPARISON_NON_NULL:
499:                case CAN_ONLY_NULL | IN_ASSIGNMENT:
500:                case CAN_ONLY_NULL | IN_INSTANCEOF:
501:                    if (flowInfo.isPotentiallyNonNull(local)
502:                            || flowInfo.isPotentiallyUnknown(local)) {
503:                        return;
504:                    }
505:                    if (flowInfo.isDefinitelyNull(local)) {
506:                        switch (checkType & CONTEXT_MASK) {
507:                        case FlowContext.IN_COMPARISON_NULL:
508:                            scope.problemReporter()
509:                                    .localVariableRedundantCheckOnNull(local,
510:                                            reference);
511:                            return;
512:                        case FlowContext.IN_COMPARISON_NON_NULL:
513:                            scope.problemReporter()
514:                                    .localVariableNullComparedToNonNull(local,
515:                                            reference);
516:                            return;
517:                        case FlowContext.IN_ASSIGNMENT:
518:                            scope.problemReporter()
519:                                    .localVariableRedundantNullAssignment(
520:                                            local, reference);
521:                            return;
522:                        case FlowContext.IN_INSTANCEOF:
523:                            scope.problemReporter()
524:                                    .localVariableNullInstanceof(local,
525:                                            reference);
526:                            return;
527:                        }
528:                    }
529:                    recordNullReference(local, reference, checkType);
530:                    return;
531:                case MAY_NULL:
532:                    if (flowInfo.isDefinitelyNonNull(local)) {
533:                        return;
534:                    }
535:                    if (flowInfo.isDefinitelyNull(local)) {
536:                        scope.problemReporter().localVariableNullReference(
537:                                local, reference);
538:                        return;
539:                    }
540:                    if (flowInfo.isPotentiallyNull(local)) {
541:                        scope.problemReporter()
542:                                .localVariablePotentialNullReference(local,
543:                                        reference);
544:                        return;
545:                    }
546:                    recordNullReference(local, reference, checkType);
547:                    return;
548:                default:
549:                    // never happens
550:                }
551:            }
552:
553:            void removeFinalAssignmentIfAny(Reference reference) {
554:                for (int i = 0; i < assignCount; i++) {
555:                    if (finalAssignments[i] == reference) {
556:                        finalAssignments[i] = null;
557:                        finalVariables[i] = null;
558:                        return;
559:                    }
560:                }
561:            }
562:        }
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