Source Code Cross Referenced for ReplaceVisitor.java in  » Database-DBMS » db4o-6.4 » EDU » purdue » cs » bloat » tree » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » EDU.purdue.cs.bloat.tree 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (C) 2004 - 2007  db4objects Inc.  http://www.db4o.com
002:
003:        This file is part of the db4o open source object database.
004:
005:        db4o is free software; you can redistribute it and/or modify it under
006:        the terms of version 2 of the GNU General Public License as published
007:        by the Free Software Foundation and as clarified by db4objects' GPL 
008:        interpretation policy, available at
009:        http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
010:        Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
011:        Suite 350, San Mateo, CA 94403, USA.
012:
013:        db4o is distributed in the hope that it will be useful, but WITHOUT ANY
014:        WARRANTY; without even the implied warranty of MERCHANTABILITY or
015:        FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
016:        for more details.
017:
018:        You should have received a copy of the GNU General Public License along
019:        with this program; if not, write to the Free Software Foundation, Inc.,
020:        59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
021:        package EDU.purdue.cs.bloat.tree;
022:
023:        import java.util.*;
024:
025:        import EDU.purdue.cs.bloat.cfg.*;
026:
027:        /**
028:         * ReplaceVisitor traverses a tree and replaces each occurrence of one Node with
029:         * another Node.
030:         */
031:        public class ReplaceVisitor extends TreeVisitor {
032:            Node from;
033:
034:            Node to;
035:
036:            /**
037:             * Constructor.
038:             * 
039:             * @param from
040:             *            The "old" Node.
041:             * @param to
042:             *            The "new" Node.
043:             */
044:            public ReplaceVisitor(final Node from, final Node to) {
045:                this .from = from;
046:                this .to = to;
047:
048:                if (Tree.DEBUG) {
049:                    System.out.println("replace " + from + " VN="
050:                            + from.valueNumber() + " in " + from.parent
051:                            + " with " + to);
052:                }
053:            }
054:
055:            public void visitTree(final Tree tree) {
056:                if (to instanceof  Stmt) {
057:                    ((Stmt) to).setParent(tree);
058:
059:                    // The most common statement replacement is the last statement.
060:                    // so search from the end of the statement list.
061:                    final ListIterator iter = tree.stmts
062:                            .listIterator(tree.stmts.size());
063:
064:                    while (iter.hasPrevious()) {
065:                        final Stmt s = (Stmt) iter.previous();
066:                        if (s == from) {
067:                            iter.set(to);
068:                            break;
069:                        }
070:                    }
071:                } else {
072:                    tree.visitChildren(this );
073:                }
074:            }
075:
076:            public void visitExprStmt(final ExprStmt stmt) {
077:                if (stmt.expr == from) {
078:                    stmt.expr = (Expr) to;
079:                    ((Expr) to).setParent(stmt);
080:                } else {
081:                    stmt.visitChildren(this );
082:                }
083:            }
084:
085:            public void visitInitStmt(final InitStmt stmt) {
086:                for (int i = 0; i < stmt.targets.length; i++) {
087:                    if (stmt.targets[i] == from) {
088:                        stmt.targets[i] = (LocalExpr) to;
089:                        ((LocalExpr) to).setParent(stmt);
090:                        return;
091:                    }
092:                }
093:
094:                stmt.visitChildren(this );
095:            }
096:
097:            public void visitGotoStmt(final GotoStmt stmt) {
098:                stmt.visitChildren(this );
099:            }
100:
101:            public void visitMonitorStmt(final MonitorStmt stmt) {
102:                if (stmt.object == from) {
103:                    stmt.object = (Expr) to;
104:                    ((Expr) to).setParent(stmt);
105:                } else {
106:                    stmt.visitChildren(this );
107:                }
108:            }
109:
110:            public void visitStackManipStmt(final StackManipStmt stmt) {
111:                for (int i = 0; i < stmt.target.length; i++) {
112:                    if (stmt.target[i] == from) {
113:                        stmt.target[i] = (StackExpr) to;
114:                        ((Expr) to).setParent(stmt);
115:                        return;
116:                    }
117:                }
118:
119:                for (int i = 0; i < stmt.source.length; i++) {
120:                    if (stmt.source[i] == from) {
121:                        stmt.source[i] = (StackExpr) to;
122:                        ((Expr) to).setParent(stmt);
123:                        return;
124:                    }
125:                }
126:
127:                stmt.visitChildren(this );
128:            }
129:
130:            public void visitCatchExpr(final CatchExpr expr) {
131:                expr.visitChildren(this );
132:            }
133:
134:            public void visitPhiJoinStmt(final PhiJoinStmt stmt) {
135:                if (stmt.target == from) {
136:                    stmt.target = (VarExpr) to;
137:                    ((VarExpr) to).setParent(stmt);
138:                } else {
139:                    final Iterator e = stmt.operands.keySet().iterator();
140:
141:                    while (e.hasNext()) {
142:                        final Block block = (Block) e.next();
143:
144:                        if (stmt.operandAt(block) == from) {
145:                            stmt.setOperandAt(block, (Expr) to);
146:                            ((Expr) to).setParent(stmt);
147:                            return;
148:                        }
149:                    }
150:
151:                    stmt.visitChildren(this );
152:                }
153:            }
154:
155:            public void visitPhiCatchStmt(final PhiCatchStmt stmt) {
156:                if (stmt.target == from) {
157:                    stmt.target = (LocalExpr) to;
158:                    ((LocalExpr) to).setParent(stmt);
159:                } else {
160:                    final ListIterator e = stmt.operands.listIterator();
161:
162:                    while (e.hasNext()) {
163:                        final LocalExpr expr = (LocalExpr) e.next();
164:
165:                        if (expr == from) {
166:                            e.set(to);
167:                            from.cleanup();
168:                            ((LocalExpr) to).setParent(stmt);
169:                            return;
170:                        }
171:                    }
172:
173:                    stmt.visitChildren(this );
174:                }
175:            }
176:
177:            public void visitRetStmt(final RetStmt stmt) {
178:                stmt.visitChildren(this );
179:            }
180:
181:            public void visitReturnExprStmt(final ReturnExprStmt stmt) {
182:                if (stmt.expr == from) {
183:                    stmt.expr = (Expr) to;
184:                    ((Expr) to).setParent(stmt);
185:                } else {
186:                    stmt.visitChildren(this );
187:                }
188:            }
189:
190:            public void visitReturnStmt(final ReturnStmt stmt) {
191:                stmt.visitChildren(this );
192:            }
193:
194:            public void visitAddressStoreStmt(final AddressStoreStmt stmt) {
195:                stmt.visitChildren(this );
196:            }
197:
198:            public void visitStoreExpr(final StoreExpr expr) {
199:                if (expr.target == from) {
200:                    expr.target = (MemExpr) to;
201:                    ((MemExpr) to).setParent(expr);
202:                } else if (expr.expr == from) {
203:                    expr.expr = (Expr) to;
204:                    ((Expr) to).setParent(expr);
205:                } else {
206:                    expr.visitChildren(this );
207:                }
208:            }
209:
210:            public void visitSwitchStmt(final SwitchStmt stmt) {
211:                if (stmt.index == from) {
212:                    stmt.index = (Expr) to;
213:                    ((Expr) to).setParent(stmt);
214:                } else {
215:                    stmt.visitChildren(this );
216:                }
217:            }
218:
219:            public void visitThrowStmt(final ThrowStmt stmt) {
220:                if (stmt.expr == from) {
221:                    stmt.expr = (Expr) to;
222:                    ((Expr) to).setParent(stmt);
223:                } else {
224:                    stmt.visitChildren(this );
225:                }
226:            }
227:
228:            public void visitSCStmt(final SCStmt stmt) {
229:                if (stmt.array == from) {
230:                    stmt.array = (Expr) to;
231:                    ((Expr) to).setParent(stmt);
232:                } else if (stmt.index == from) {
233:                    stmt.index = (Expr) to;
234:                    ((Expr) to).setParent(stmt);
235:                } else {
236:                    stmt.visitChildren(this );
237:                }
238:            }
239:
240:            public void visitSRStmt(final SRStmt stmt) {
241:                if (stmt.array == from) {
242:                    stmt.array = (Expr) to;
243:                    ((Expr) to).setParent(stmt);
244:                } else if (stmt.start == from) {
245:                    stmt.start = (Expr) to;
246:                    ((Expr) to).setParent(stmt);
247:                } else if (stmt.end == from) {
248:                    stmt.end = (Expr) to;
249:                    ((Expr) to).setParent(stmt);
250:                } else {
251:                    stmt.visitChildren(this );
252:                }
253:            }
254:
255:            public void visitDefExpr(final DefExpr expr) {
256:                expr.visitChildren(this );
257:            }
258:
259:            public void visitArrayLengthExpr(final ArrayLengthExpr expr) {
260:                if (expr.array == from) {
261:                    expr.array = (Expr) to;
262:                    ((Expr) to).setParent(expr);
263:                } else {
264:                    expr.visitChildren(this );
265:                }
266:            }
267:
268:            public void visitArithExpr(final ArithExpr expr) {
269:                if (expr.left == from) {
270:                    expr.left = (Expr) to;
271:                    ((Expr) to).setParent(expr);
272:                } else if (expr.right == from) {
273:                    expr.right = (Expr) to;
274:                    ((Expr) to).setParent(expr);
275:                } else {
276:                    expr.visitChildren(this );
277:                }
278:            }
279:
280:            public void visitArrayRefExpr(final ArrayRefExpr expr) {
281:                if (expr.array == from) {
282:                    expr.array = (Expr) to;
283:                    ((Expr) to).setParent(expr);
284:                } else if (expr.index == from) {
285:                    expr.index = (Expr) to;
286:                    ((Expr) to).setParent(expr);
287:                } else {
288:                    expr.visitChildren(this );
289:                }
290:            }
291:
292:            public void visitCallMethodExpr(final CallMethodExpr expr) {
293:                if (expr.receiver == from) {
294:                    expr.receiver = (Expr) to;
295:                    ((Expr) to).setParent(expr);
296:                } else {
297:                    for (int i = 0; i < expr.params.length; i++) {
298:                        if (expr.params[i] == from) {
299:                            expr.params[i] = (Expr) to;
300:                            ((Expr) to).setParent(expr);
301:                            return;
302:                        }
303:                    }
304:
305:                    expr.visitChildren(this );
306:                }
307:            }
308:
309:            public void visitCallStaticExpr(final CallStaticExpr expr) {
310:                for (int i = 0; i < expr.params.length; i++) {
311:                    if (expr.params[i] == from) {
312:                        expr.params[i] = (Expr) to;
313:                        ((Expr) to).setParent(expr);
314:                        return;
315:                    }
316:                }
317:
318:                expr.visitChildren(this );
319:            }
320:
321:            public void visitCastExpr(final CastExpr expr) {
322:                if (expr.expr == from) {
323:                    expr.expr = (Expr) to;
324:                    ((Expr) to).setParent(expr);
325:                } else {
326:                    expr.visitChildren(this );
327:                }
328:            }
329:
330:            public void visitConstantExpr(final ConstantExpr expr) {
331:                expr.visitChildren(this );
332:            }
333:
334:            public void visitFieldExpr(final FieldExpr expr) {
335:                if (expr.object == from) {
336:                    expr.object = (Expr) to;
337:                    ((Expr) to).setParent(expr);
338:                } else {
339:                    expr.visitChildren(this );
340:                }
341:            }
342:
343:            public void visitInstanceOfExpr(final InstanceOfExpr expr) {
344:                if (expr.expr == from) {
345:                    expr.expr = (Expr) to;
346:                    ((Expr) to).setParent(expr);
347:                } else {
348:                    expr.visitChildren(this );
349:                }
350:            }
351:
352:            public void visitLocalExpr(final LocalExpr expr) {
353:                expr.visitChildren(this );
354:            }
355:
356:            public void visitNegExpr(final NegExpr expr) {
357:                if (expr.expr == from) {
358:                    expr.expr = (Expr) to;
359:                    ((Expr) to).setParent(expr);
360:                } else {
361:                    expr.visitChildren(this );
362:                }
363:            }
364:
365:            public void visitNewArrayExpr(final NewArrayExpr expr) {
366:                if (expr.size == from) {
367:                    expr.size = (Expr) to;
368:                    ((Expr) to).setParent(expr);
369:                } else {
370:                    expr.visitChildren(this );
371:                }
372:            }
373:
374:            public void visitNewExpr(final NewExpr expr) {
375:                expr.visitChildren(this );
376:            }
377:
378:            public void visitNewMultiArrayExpr(final NewMultiArrayExpr expr) {
379:                for (int i = 0; i < expr.dimensions.length; i++) {
380:                    if (expr.dimensions[i] == from) {
381:                        expr.dimensions[i] = (Expr) to;
382:                        ((Expr) to).setParent(expr);
383:                        return;
384:                    }
385:                }
386:
387:                expr.visitChildren(this );
388:            }
389:
390:            public void visitIfZeroStmt(final IfZeroStmt stmt) {
391:                if (stmt.expr == from) {
392:                    stmt.expr = (Expr) to;
393:                    ((Expr) to).setParent(stmt);
394:                } else {
395:                    stmt.visitChildren(this );
396:                }
397:            }
398:
399:            public void visitIfCmpStmt(final IfCmpStmt stmt) {
400:                if (stmt.left == from) {
401:                    stmt.left = (Expr) to;
402:                    ((Expr) to).setParent(stmt);
403:                } else if (stmt.right == from) {
404:                    stmt.right = (Expr) to;
405:                    ((Expr) to).setParent(stmt);
406:                } else {
407:                    stmt.visitChildren(this );
408:                }
409:            }
410:
411:            public void visitReturnAddressExpr(final ReturnAddressExpr expr) {
412:                expr.visitChildren(this );
413:            }
414:
415:            public void visitShiftExpr(final ShiftExpr expr) {
416:                if (expr.expr == from) {
417:                    expr.expr = (Expr) to;
418:                    ((Expr) to).setParent(expr);
419:                } else if (expr.bits == from) {
420:                    expr.bits = (Expr) to;
421:                    ((Expr) to).setParent(expr);
422:                } else {
423:                    expr.visitChildren(this );
424:                }
425:            }
426:
427:            public void visitZeroCheckExpr(final ZeroCheckExpr expr) {
428:                if (expr.expr == from) {
429:                    expr.expr = (Expr) to;
430:                    ((Expr) to).setParent(expr);
431:                } else {
432:                    expr.visitChildren(this );
433:                }
434:            }
435:
436:            public void visitRCExpr(final RCExpr expr) {
437:                if (expr.expr == from) {
438:                    expr.expr = (Expr) to;
439:                    ((Expr) to).setParent(expr);
440:                } else {
441:                    expr.visitChildren(this );
442:                }
443:            }
444:
445:            public void visitUCExpr(final UCExpr expr) {
446:                if (expr.expr == from) {
447:                    expr.expr = (Expr) to;
448:                    ((Expr) to).setParent(expr);
449:                } else {
450:                    expr.visitChildren(this );
451:                }
452:            }
453:
454:            public void visitStackExpr(final StackExpr expr) {
455:                expr.visitChildren(this );
456:            }
457:
458:            public void visitStaticFieldExpr(final StaticFieldExpr expr) {
459:                expr.visitChildren(this);
460:            }
461:        }
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