import java.io.*;
-public class TokenTupleSet {
+public class TokenTupleSet extends Canonical {
- public HashSet<TokenTuple> tokenTuples;
+ private HashSet<TokenTuple> tokenTuples;
- public TokenTupleSet() {
- tokenTuples = new HashSet<TokenTuple>();
+
+ public TokenTupleSet() {
+ tokenTuples = new HashSet<TokenTuple>();
+ }
+
+ public TokenTupleSet(TokenTuple tt) {
+ this();
+ assert tt != null;
+ tokenTuples.add(tt);
+ }
+
+ public TokenTupleSet(TokenTupleSet tts) {
+ assert tts != null;
+ // okay to clone, TokenTuple and TokenTupleSet should be canonical
+ tokenTuples = (HashSet<TokenTuple>)tts.tokenTuples.clone();
+ }
+
+
+ public TokenTupleSet makeCanonical() {
+ return (TokenTupleSet) Canonical.makeCanonical(this);
+ }
+
+ public Iterator iterator() {
+ return tokenTuples.iterator();
+ }
+
+ public boolean isEmpty() {
+ return tokenTuples.isEmpty();
+ }
+
+ public boolean isSubset(TokenTupleSet ttsIn) {
+ assert ttsIn != null;
+ return ttsIn.tokenTuples.containsAll(this.tokenTuples);
+ }
+
+ public boolean containsTuple(TokenTuple tt) {
+ assert tt != null;
+ return tokenTuples.contains(tt);
+ }
+
+
+ public TokenTupleSet union(TokenTupleSet ttsIn) {
+ assert ttsIn != null;
+ TokenTupleSet ttsOut = new TokenTupleSet(this);
+ ttsOut.tokenTuples.addAll(ttsIn.tokenTuples);
+ return ttsOut.makeCanonical();
+ }
+
+ public TokenTupleSet add(TokenTuple tt) {
+ assert tt != null;
+ TokenTupleSet ttsOut = new TokenTupleSet(tt);
+ return ttsOut.union(this);
+ }
+
+
+ // this should only be done with a multiple-object heap region's token!
+ public TokenTupleSet increaseArity(Integer token) {
+ assert token != null;
+ TokenTupleSet ttsOut = new TokenTupleSet(this);
+ TokenTuple tt
+ = new TokenTuple(token, true, TokenTuple.ARITY_ONE).makeCanonical();
+ if( ttsOut.tokenTuples.contains(tt) ) {
+ ttsOut.tokenTuples.remove(tt);
+ ttsOut.tokenTuples.add(
+ new TokenTuple(token, true, TokenTuple.ARITY_MANY).makeCanonical()
+ );
}
- public TokenTupleSet( TokenTuple tt ) {
- this();
- tokenTuples.add( tt );
+ return ttsOut.makeCanonical();
+ }
+
+
+ public boolean equals(Object o) {
+ if( o == null ) {
+ return false;
}
- public TokenTupleSet( TokenTupleSet tts ) {
- tokenTuples = (HashSet<TokenTuple>) tts.tokenTuples.clone(); //COPY?!
+ if( !(o instanceof TokenTupleSet) ) {
+ return false;
}
- public Iterator iterator() {
- return tokenTuples.iterator();
+ TokenTupleSet tts = (TokenTupleSet) o;
+ return tokenTuples.equals(tts.tokenTuples);
+ }
+
+ public int hashCode() {
+ return tokenTuples.hashCode();
+ }
+
+
+ // this should be a hash table so we can do this by key
+ public boolean containsToken(Integer token) {
+ assert token != null;
+
+ Iterator itr = tokenTuples.iterator();
+ while( itr.hasNext() ) {
+ TokenTuple tt = (TokenTuple) itr.next();
+ if( token.equals(tt.getToken() ) ) {
+ return true;
+ }
}
+ return false;
+ }
+
+
+ public TokenTupleSet ageTokens(AllocationSite as) {
+ assert as != null;
+
+ TokenTupleSet ttsOut = new TokenTupleSet();
+
+ TokenTuple ttSummary = null;
+ boolean foundOldest = false;
- public TokenTupleSet union( TokenTupleSet ttsIn ) {
- TokenTupleSet ttsOut = new TokenTupleSet( this );
- ttsOut.tokenTuples.addAll( ttsIn.tokenTuples );
- return ttsOut;
+ Iterator itrT = this.iterator();
+ while( itrT.hasNext() ) {
+ TokenTuple tt = (TokenTuple) itrT.next();
+
+ Integer token = tt.getToken();
+ int age = as.getAge(token);
+
+ // summary tokens and tokens not associated with
+ // the site should be left alone
+ if( age == AllocationSite.AGE_notInThisSite ) {
+ ttsOut.tokenTuples.add(tt);
+
+ } else {
+ if( age == AllocationSite.AGE_summary ) {
+ // remember the summary tuple, but don't add it
+ // we may combine it with the oldest tuple
+ ttSummary = tt;
+
+ } else if( age == AllocationSite.AGE_oldest ) {
+ // found an oldest token, again just remember
+ // for later
+ foundOldest = true;
+
+ } else {
+ // otherwise, we change this token to the
+ // next older token
+ Integer tokenToChangeTo = as.getIthOldest(age + 1);
+ TokenTuple ttAged = tt.changeTokenTo(tokenToChangeTo);
+ ttsOut.tokenTuples.add(ttAged);
+ }
+
+ }
}
- public boolean contains( TokenTuple tt ) {
- return tokenTuples.contains( tt );
+ // there are four cases to consider here
+ // 1. we found a summary tuple and no oldest tuple
+ // Here we just pass the summary unchanged
+ // 2. we found an oldest tuple, no summary
+ // Make a new, arity-one summary tuple
+ // 3. we found both a summary and an oldest
+ // Merge them by increasing arity of summary
+ // 4. (not handled) we found neither, do nothing
+ if ( ttSummary != null && !foundOldest ) {
+ ttsOut.tokenTuples.add(ttSummary);
+
+ } else if( ttSummary == null && foundOldest ) {
+ ttsOut.tokenTuples.add(new TokenTuple(as.getSummary(),
+ true,
+ TokenTuple.ARITY_ONE).makeCanonical() );
+
+ } else if( ttSummary != null && foundOldest ) {
+ ttsOut.tokenTuples.add(ttSummary.increaseArity() );
}
- public String toString() {
- return tokenTuples.toString();
+ return ttsOut.makeCanonical();
+ }
+
+
+ public ReachabilitySet simpleRewriteToken( TokenTuple tokenToRewrite,
+ ReachabilitySet replacements ) {
+
+ ReachabilitySet rsOut = new ReachabilitySet().makeCanonical();
+
+ if( !tokenTuples.contains( tokenToRewrite ) ) {
+ rsOut = rsOut.add( this );
+
+ } else {
+ TokenTupleSet ttsMinusToken = new TokenTupleSet( this );
+ ttsMinusToken.tokenTuples.remove( tokenToRewrite );
+
+ Iterator<TokenTupleSet> replaceItr = replacements.iterator();
+ while( replaceItr.hasNext() ) {
+ TokenTupleSet replacement = replaceItr.next();
+ TokenTupleSet replaced = new TokenTupleSet();
+ replaced.tokenTuples.addAll( ttsMinusToken.tokenTuples );
+ replaced.tokenTuples.addAll( replacement.tokenTuples );
+ replaced = replaced.makeCanonical();
+ rsOut = rsOut.add( replaced );
+ }
}
+
+ return rsOut;
+ }
+
+
+ public ReachabilitySet exhaustiveRewriteToken( TokenTuple tokenToRewrite,
+ ReachabilitySet replacements ) {
+
+ ReachabilitySet rsOut = new ReachabilitySet().makeCanonical();
+
+ /*
+ if( !tokenTuples.contains( tokenToRewrite ) ) {
+ rsOut = rsOut.add( this );
+
+ } else {
+ TokenTupleSet ttsMinusToken = new TokenTupleSet( this );
+ ttsMinusToken.tokenTuples.remove( tokenToRewrite );
+
+ Iterator<TokenTupleSet> replaceItr = replacements.iterator();
+ while( replaceItr.hasNext() ) {
+ TokenTupleSet replacement = replaceItr.next();
+ TokenTupleSet replaced = new TokenTupleSet();
+ replaced.tokenTuples.addAll( ttsMinusToken.tokenTuples );
+ replaced.tokenTuples.addAll( replacement.tokenTuples );
+ replaced = replaced.makeCanonical();
+ rsOut = rsOut.add( replaced );
+ }
+ }
+ */
+
+ return rsOut;
+ }
+
+
+ public String toString() {
+ return tokenTuples.toString();
+ }
}
projects / IRC.git / blobdiff