1 package Analysis.OwnershipAnalysis;
9 public class ReachabilitySet extends Canonical {
11 private HashSet<TokenTupleSet> possibleReachabilities;
13 public ReachabilitySet() {
14 possibleReachabilities = new HashSet<TokenTupleSet>();
17 public ReachabilitySet(TokenTupleSet tts) {
20 possibleReachabilities.add(tts);
23 public ReachabilitySet(TokenTuple tt) {
24 // can't assert before calling this(), it will
25 // do the checking though
26 this( new TokenTupleSet(tt).makeCanonical() );
29 public ReachabilitySet(HashSet<TokenTupleSet> possibleReachabilities) {
30 assert possibleReachabilities != null;
31 this.possibleReachabilities = possibleReachabilities;
34 public ReachabilitySet(ReachabilitySet rs) {
36 // okay to clone, ReachabilitySet should be canonical
37 possibleReachabilities = (HashSet<TokenTupleSet>)rs.possibleReachabilities.clone();
41 public ReachabilitySet makeCanonical() {
42 return (ReachabilitySet) Canonical.makeCanonical(this);
45 public Iterator<TokenTupleSet> iterator() {
46 return possibleReachabilities.iterator();
50 public boolean contains(TokenTupleSet tts) {
52 return possibleReachabilities.contains(tts);
55 public boolean containsTuple(TokenTuple tt) {
56 Iterator itr = iterator();
57 while( itr.hasNext() ) {
58 TokenTupleSet tts = (TokenTupleSet) itr.next();
59 if( tts.containsTuple(tt) ) {
67 public ReachabilitySet increaseArity(Integer token) {
70 HashSet<TokenTupleSet> possibleReachabilitiesNew = new HashSet<TokenTupleSet>();
72 Iterator itr = iterator();
73 while( itr.hasNext() ) {
74 TokenTupleSet tts = (TokenTupleSet) itr.next();
75 possibleReachabilitiesNew.add(tts.increaseArity(token) );
78 return new ReachabilitySet(possibleReachabilitiesNew).makeCanonical();
82 public ReachabilitySet union(ReachabilitySet rsIn) {
85 ReachabilitySet rsOut = new ReachabilitySet(this);
86 rsOut.possibleReachabilities.addAll(rsIn.possibleReachabilities);
87 return rsOut.makeCanonical();
90 public ReachabilitySet union(TokenTupleSet ttsIn) {
93 ReachabilitySet rsOut = new ReachabilitySet(this);
94 rsOut.possibleReachabilities.add(ttsIn);
95 return rsOut.makeCanonical();
98 public ReachabilitySet intersection(ReachabilitySet rsIn) {
101 ReachabilitySet rsOut = new ReachabilitySet();
103 Iterator i = this.iterator();
104 while( i.hasNext() ) {
105 TokenTupleSet tts = (TokenTupleSet) i.next();
106 if( rsIn.possibleReachabilities.contains(tts) ) {
107 rsOut.possibleReachabilities.add(tts);
111 return rsOut.makeCanonical();
115 public ReachabilitySet add(TokenTupleSet tts) {
117 ReachabilitySet rsOut = new ReachabilitySet(tts);
118 return rsOut.union(this);
122 public ChangeTupleSet unionUpArityToChangeSet(ReachabilitySet rsIn) {
125 ChangeTupleSet ctsOut = new ChangeTupleSet();
127 Iterator itrO = this.iterator();
128 while( itrO.hasNext() ) {
129 TokenTupleSet o = (TokenTupleSet) itrO.next();
131 Iterator itrR = rsIn.iterator();
132 while( itrR.hasNext() ) {
133 TokenTupleSet r = (TokenTupleSet) itrR.next();
135 TokenTupleSet theUnion = new TokenTupleSet();
137 Iterator itrRelement = r.iterator();
138 while( itrRelement.hasNext() ) {
139 TokenTuple e = (TokenTuple) itrRelement.next();
141 if( o.containsToken(e.getToken() ) ) {
142 theUnion = theUnion.union(new TokenTupleSet(e.increaseArity() ) ).makeCanonical();
144 theUnion = theUnion.union(new TokenTupleSet(e) ).makeCanonical();
148 Iterator itrOelement = o.iterator();
149 while( itrOelement.hasNext() ) {
150 TokenTuple e = (TokenTuple) itrOelement.next();
152 if( !theUnion.containsToken(e.getToken() ) ) {
153 theUnion = theUnion.union(new TokenTupleSet(e) ).makeCanonical();
157 if( !theUnion.isEmpty() ) {
158 ctsOut = ctsOut.union(
159 new ChangeTupleSet(new ChangeTuple(o, theUnion) )
165 return ctsOut.makeCanonical();
169 public ReachabilitySet ageTokens(AllocationSite as) {
172 ReachabilitySet rsOut = new ReachabilitySet();
174 Iterator itrS = this.iterator();
175 while( itrS.hasNext() ) {
176 TokenTupleSet tts = (TokenTupleSet) itrS.next();
177 rsOut.possibleReachabilities.add(tts.ageTokens(as) );
180 return rsOut.makeCanonical();
184 public ReachabilitySet pruneBy(ReachabilitySet rsIn) {
187 ReachabilitySet rsOut = new ReachabilitySet();
189 Iterator itrB = this.iterator();
190 while( itrB.hasNext() ) {
191 TokenTupleSet ttsB = (TokenTupleSet) itrB.next();
193 boolean subsetExists = false;
195 Iterator itrA = rsIn.iterator();
196 while( itrA.hasNext() && !subsetExists ) {
197 TokenTupleSet ttsA = (TokenTupleSet) itrA.next();
199 if( ttsA.isSubset(ttsB) ) {
205 rsOut.possibleReachabilities.add(ttsB);
209 return rsOut.makeCanonical();
213 public ReachabilitySet exhaustiveArityCombinations() {
214 ReachabilitySet rsOut = new ReachabilitySet();
216 int numDimensions = this.possibleReachabilities.size();
218 // add an extra digit to detect termination
219 int[] digits = new int[numDimensions+1];
224 // start with the minimum possible coordinate
225 for( int i = 0; i < numDimensions+1; ++i ) {
226 digits[i] = minArity;
229 // and stop when the highest-ordered axis rolls above the minimum
230 while( digits[numDimensions] == minArity ) {
232 // spit out a "coordinate" made from these digits
233 TokenTupleSet ttsCoordinate = new TokenTupleSet();
234 Iterator<TokenTupleSet> ttsItr = this.iterator();
235 for( int i = 0; i < numDimensions; ++i ) {
236 assert ttsItr.hasNext();
237 TokenTupleSet ttsUnit = ttsItr.next();
238 for( int j = 0; j < digits[i]; ++j ) {
239 ttsCoordinate = ttsCoordinate.unionUpArity( ttsUnit );
242 rsOut = rsOut.add( ttsCoordinate.makeCanonical() );
245 for( int i = 0; i < numDimensions+1; ++i ) {
247 if( digits[i] > maxArity ) {
248 // this axis reached its max, so roll it back to min and increment next higher digit
249 digits[i] = minArity;
252 // this axis did not reach its max so we just enumerated a new unique coordinate, stop
258 return rsOut.makeCanonical();
262 public boolean equals(Object o) {
267 if( !(o instanceof ReachabilitySet) ) {
271 ReachabilitySet rs = (ReachabilitySet) o;
272 return possibleReachabilities.equals(rs.possibleReachabilities);
275 public int hashCode() {
276 return possibleReachabilities.hashCode();
280 public String toStringEscapeNewline() {
283 Iterator i = this.iterator();
284 while( i.hasNext() ) {
295 public String toString() {
298 Iterator i = this.iterator();
299 while( i.hasNext() ) {