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Diffstat (limited to 'src/org/jetbrains/java/decompiler/modules/decompiler/DecHelper.java')
| -rw-r--r-- | src/org/jetbrains/java/decompiler/modules/decompiler/DecHelper.java | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/DecHelper.java b/src/org/jetbrains/java/decompiler/modules/decompiler/DecHelper.java new file mode 100644 index 0000000..ea8823a --- /dev/null +++ b/src/org/jetbrains/java/decompiler/modules/decompiler/DecHelper.java @@ -0,0 +1,217 @@ +/* + * Fernflower - The Analytical Java Decompiler + * http://www.reversed-java.com + * + * (C) 2008 - 2010, Stiver + * + * This software is NEITHER public domain NOR free software + * as per GNU License. See license.txt for more details. + * + * This software is distributed WITHOUT ANY WARRANTY; without + * even the implied warranty of MERCHANTABILITY or FITNESS FOR + * A PARTICULAR PURPOSE. + */ + +package org.jetbrains.java.decompiler.modules.decompiler; + +import java.util.ArrayList; +import java.util.HashSet; +import java.util.Iterator; +import java.util.List; +import java.util.Set; + +import org.jetbrains.java.decompiler.modules.decompiler.exps.Exprent; +import org.jetbrains.java.decompiler.modules.decompiler.stats.Statement; + + +public class DecHelper { + + public static boolean checkStatementExceptions(List<Statement> lst) { + + Set<Statement> all = new HashSet<Statement>(lst); + + Set<Statement> handlers = new HashSet<Statement>(); + Set<Statement> intersection = null; + + for(Statement stat : lst) { + Set<Statement> setNew = stat.getNeighboursSet(StatEdge.TYPE_EXCEPTION, Statement.DIRECTION_FORWARD); + + if(intersection == null) { + intersection = setNew; + } else { + HashSet<Statement> interclone = new HashSet<Statement>(intersection); + interclone.removeAll(setNew); + + intersection.retainAll(setNew); + + setNew.removeAll(intersection); + + handlers.addAll(interclone); + handlers.addAll(setNew); + } + } + + for(Statement stat : handlers) { + if(!all.contains(stat) || !all.containsAll(stat.getNeighbours(StatEdge.TYPE_EXCEPTION, Statement.DIRECTION_BACKWARD))) { + return false; + } + } + + // check for other handlers (excluding head) + for(int i=1;i<lst.size();i++) { + Statement stat = lst.get(i); + if(!stat.getPredecessorEdges(StatEdge.TYPE_EXCEPTION).isEmpty() && !handlers.contains(stat)) { + return false; + } + } + + return true; + } + + public static boolean isChoiceStatement(Statement head, List<Statement> lst) { + + Statement post = null; + + Set<Statement> setDest = head.getNeighboursSet(StatEdge.TYPE_REGULAR, Statement.DIRECTION_FORWARD); + + if(setDest.contains(head)) { + return false; + } + + for(;;) { + + lst.clear(); + + boolean repeat = false; + + setDest.remove(post); + Iterator<Statement> it = setDest.iterator(); + + while(it.hasNext()) { + Statement stat = it.next(); + + if(stat.getLastBasicType() != Statement.LASTBASICTYPE_GENERAL) { + if(post == null) { + post = stat; + repeat = true; + break; + } else { + return false; + } + } + + // preds + Set<Statement> setPred = stat.getNeighboursSet(StatEdge.TYPE_REGULAR, Statement.DIRECTION_BACKWARD); + setPred.remove(head); + if(setPred.contains(stat)) { + return false; + } + + if(!setDest.containsAll(setPred) || setPred.size()>1) { + if(post == null) { + post = stat; + repeat = true; + break; + } else { + return false; + } + } else if(setPred.size() == 1) { + Statement pred = setPred.iterator().next(); + while(lst.contains(pred)) { + Set<Statement> setPredTemp = pred.getNeighboursSet(StatEdge.TYPE_REGULAR, Statement.DIRECTION_BACKWARD); + setPredTemp.remove(head); + + if(!setPredTemp.isEmpty()) { // at most 1 predecessor + pred = setPredTemp.iterator().next(); + if(pred == stat) { + return false; // loop found + } + } else { + break; + } + } + } + + // succs + List<StatEdge> lstEdges = stat.getSuccessorEdges(Statement.STATEDGE_DIRECT_ALL); + if(lstEdges.size() > 1) { + Set<Statement> setSucc = stat.getNeighboursSet(Statement.STATEDGE_DIRECT_ALL, Statement.DIRECTION_FORWARD); + setSucc.retainAll(setDest); + + if(setSucc.size()>0) { + return false; + } else { + if(post == null) { + post = stat; + repeat = true; + break; + } else { + return false; + } + } + } else if(lstEdges.size() == 1) { + + StatEdge edge = lstEdges.get(0); + if(edge.getType() == StatEdge.TYPE_REGULAR) { + Statement statd = edge.getDestination(); + if(head == statd) { + return false; + } + if(!setDest.contains(statd) && post!=statd) { + if(post!=null) { + return false; + } else { + Set<Statement> set = statd.getNeighboursSet(StatEdge.TYPE_REGULAR, Statement.DIRECTION_BACKWARD); + if(set.size()>1){ + post = statd; + repeat = true; + break; + } else { + return false; + } + } + } + } + } + + lst.add(stat); + } + + if(!repeat) { + break; + } + + } + + lst.add(head); + lst.remove(post); + + lst.add(0, post); + + return true; + + } + + + public static HashSet<Statement> getUniquePredExceptions(Statement head) { + + HashSet<Statement> setHandlers = new HashSet<Statement>(head.getNeighbours(StatEdge.TYPE_EXCEPTION, Statement.DIRECTION_FORWARD)); + + Iterator<Statement> it = setHandlers.iterator(); + while(it.hasNext()) { + if(it.next().getPredecessorEdges(StatEdge.TYPE_EXCEPTION).size()>1) { + it.remove(); + } + } + return setHandlers; + } + + public static List<Exprent> copyExprentList(List<Exprent> lst) { + List<Exprent> ret = new ArrayList<Exprent>(); + for(Exprent expr: lst) { + ret.add(expr.copy()); + } + return ret; + } + +} |