Robust/src/Analysis/Locality/DiscoverConflicts.java

   1 package Analysis.Locality;
   2
   3 import IR.Flat.*;
   4 import java.util.Set;
   5 import java.util.Arrays;
   6 import java.util.HashSet;
   7 import java.util.Iterator;
   8 import java.util.Hashtable;
   9 import IR.State;
  10 import IR.Operation;
  11 import IR.TypeDescriptor;
  12 import IR.MethodDescriptor;
  13 import IR.FieldDescriptor;
  14 import Analysis.Liveness;
  15 import Analysis.Loops.GlobalFieldType;
  16
  17 public class DiscoverConflicts {
  18   Set<FieldDescriptor> fields;
  19   Set<TypeDescriptor> arrays;
  20   LocalityAnalysis locality;
  21   State state;
  22   Hashtable<LocalityBinding, Set<FlatNode>> treadmap;
  23   Hashtable<LocalityBinding, Set<TempFlatPair>> transreadmap;
  24   Hashtable<LocalityBinding, Set<FlatNode>> twritemap;
  25   Hashtable<LocalityBinding, Set<TempFlatPair>> writemap;
  26   Hashtable<LocalityBinding, Set<FlatNode>> getmap;
  27
  28   Hashtable<LocalityBinding, Set<FlatNode>> srcmap;
  29   Hashtable<LocalityBinding, Set<FlatNode>> leftsrcmap;
  30   Hashtable<LocalityBinding, Set<FlatNode>> rightsrcmap;
  31   TypeAnalysis typeanalysis;
  32   Hashtable<LocalityBinding, HashSet<FlatNode>>cannotdelaymap;
  33   Hashtable<LocalityBinding, Hashtable<FlatNode, Hashtable<TempDescriptor, Set<TempFlatPair>>>> lbtofnmap;
  34   boolean inclusive=false;
  35   boolean normalassign=false;
  36   GlobalFieldType gft;
  37
  38   public DiscoverConflicts(LocalityAnalysis locality, State state, TypeAnalysis typeanalysis, GlobalFieldType gft) {
  39     this.locality=locality;
  40     this.fields=new HashSet<FieldDescriptor>();
  41     this.arrays=new HashSet<TypeDescriptor>();
  42     this.state=state;
  43     this.typeanalysis=typeanalysis;
  44     transreadmap=new Hashtable<LocalityBinding, Set<TempFlatPair>>();
  45     treadmap=new Hashtable<LocalityBinding, Set<FlatNode>>();
  46     srcmap=new Hashtable<LocalityBinding, Set<FlatNode>>();
  47     leftsrcmap=new Hashtable<LocalityBinding, Set<FlatNode>>();
  48     rightsrcmap=new Hashtable<LocalityBinding, Set<FlatNode>>();
  49     lbtofnmap=new Hashtable<LocalityBinding, Hashtable<FlatNode, Hashtable<TempDescriptor, Set<TempFlatPair>>>>();
  50     if (gft!=null) {
  51       twritemap=new Hashtable<LocalityBinding, Set<FlatNode>>();
  52       writemap=new Hashtable<LocalityBinding, Set<TempFlatPair>>();
  53     }
  54     getmap=new Hashtable<LocalityBinding, Set<FlatNode>>();
  55     this.gft=gft;
  56   }
  57
  58   public DiscoverConflicts(LocalityAnalysis locality, State state, TypeAnalysis typeanalysis, Hashtable<LocalityBinding, HashSet<FlatNode>> cannotdelaymap, boolean inclusive, boolean normalassign, GlobalFieldType gft) {
  59     this.locality=locality;
  60     this.fields=new HashSet<FieldDescriptor>();
  61     this.arrays=new HashSet<TypeDescriptor>();
  62     this.state=state;
  63     this.typeanalysis=typeanalysis;
  64     this.cannotdelaymap=cannotdelaymap;
  65     transreadmap=new Hashtable<LocalityBinding, Set<TempFlatPair>>();
  66     treadmap=new Hashtable<LocalityBinding, Set<FlatNode>>();
  67     srcmap=new Hashtable<LocalityBinding, Set<FlatNode>>();
  68     leftsrcmap=new Hashtable<LocalityBinding, Set<FlatNode>>();
  69     rightsrcmap=new Hashtable<LocalityBinding, Set<FlatNode>>();
  70     lbtofnmap=new Hashtable<LocalityBinding, Hashtable<FlatNode, Hashtable<TempDescriptor, Set<TempFlatPair>>>>();
  71     this.inclusive=inclusive;
  72     this.normalassign=normalassign;
  73     if (gft!=null) {
  74       twritemap=new Hashtable<LocalityBinding, Set<FlatNode>>();
  75       writemap=new Hashtable<LocalityBinding, Set<TempFlatPair>>();
  76     }
  77     getmap=new Hashtable<LocalityBinding, Set<FlatNode>>();
  78     this.gft=gft;
  79   }
  80
  81   public Set<FieldDescriptor> getFields() {
  82     return fields;
  83   }
  84
  85   public Set<TypeDescriptor> getArrays() {
  86     return arrays;
  87   }
  88
  89   public void doAnalysis() {
  90     //Compute fields and arrays for all transactions.  Note that we
  91     //only look at changes to old objects
  92
  93     Set<LocalityBinding> localityset=locality.getLocalityBindings();
  94     for(Iterator<LocalityBinding> lb=localityset.iterator();lb.hasNext();) {
  95       computeModified(lb.next());
  96     }
  97     expandTypes();
  98     //Compute set of nodes that need transread
  99     for(Iterator<LocalityBinding> lb=localityset.iterator();lb.hasNext();) {
 100       LocalityBinding l=lb.next();
 101       analyzeLocality(l);
 102     }
 103   }
 104
 105   //Change flatnode/temp pairs to just flatnodes that need transactional reads
 106
 107   private void setNeedReadTrans(LocalityBinding lb) {
 108     HashSet<FlatNode> set=new HashSet<FlatNode>();
 109     for(Iterator<TempFlatPair> it=transreadmap.get(lb).iterator();it.hasNext();) {
 110       TempFlatPair tfp=it.next();
 111       set.add(tfp.f);
 112     }
 113     treadmap.put(lb, set);
 114     if (gft!=null) {
 115       //need to translate write map set
 116       set=new HashSet<FlatNode>();
 117       for(Iterator<TempFlatPair> it=writemap.get(lb).iterator();it.hasNext();) {
 118         TempFlatPair tfp=it.next();
 119         set.add(tfp.f);
 120       }
 121       twritemap.put(lb, set);
 122     }
 123   }
 124
 125   private void computeneedsarrayget(LocalityBinding lb, Hashtable<FlatNode, Hashtable<TempDescriptor, Set<TempFlatPair>>> fnmap) {
 126     //    Set<FlatNode> gwriteset=(state.READSET&&gft!=null)?twritemap.get(lb):treadmap.get(lb);
 127     if (state.READSET&&gft!=null) {
 128       if (twritemap.get(lb).size()==0) {
 129         getmap.put(lb, new HashSet<FlatNode>());
 130         return;
 131       }
 132     }
 133
 134     Set<FlatNode> gwriteset=treadmap.get(lb);
 135     FlatMethod fm=state.getMethodFlat(lb.getMethod());
 136     HashSet<FlatNode> needsget=new HashSet<FlatNode>();
 137     for(Iterator<FlatNode> fnit=fm.getNodeSet().iterator();fnit.hasNext();) {
 138       FlatNode fn=fnit.next();
 139       Hashtable<FlatNode, Integer> atomictable=locality.getAtomic(lb);
 140       if (atomictable.get(fn).intValue()>0&&fn.kind()==FKind.FlatElementNode) {
 141         FlatElementNode fen=(FlatElementNode)fn;
 142         Set<TempFlatPair> tfpset=fnmap.get(fen).get(fen.getSrc());
 143         if (tfpset!=null) {
 144           for(Iterator<TempFlatPair> tfpit=tfpset.iterator();tfpit.hasNext();) {
 145             TempFlatPair tfp=tfpit.next();
 146             if (gwriteset.contains(tfp.f)) {
 147               needsget.add(fen);
 148               break;
 149             }
 150           }
 151         }
 152       }
 153     }
 154     getmap.put(lb, needsget);
 155   }
 156
 157   //We have a set of things we write to, figure out what things this
 158   //could effect.
 159   public void expandTypes() {
 160     Set<TypeDescriptor> expandedarrays=new HashSet<TypeDescriptor>();
 161     for(Iterator<TypeDescriptor> it=arrays.iterator();it.hasNext();) {
 162       TypeDescriptor td=it.next();
 163       expandedarrays.addAll(typeanalysis.expand(td));
 164     }
 165     arrays=expandedarrays;
 166   }
 167
 168   Hashtable<TempDescriptor, Set<TempFlatPair>> doMerge(FlatNode fn, Hashtable<FlatNode, Hashtable<TempDescriptor, Set<TempFlatPair>>> tmptofnset) {
 169     Hashtable<TempDescriptor, Set<TempFlatPair>> table=new Hashtable<TempDescriptor, Set<TempFlatPair>>();
 170     for(int i=0;i<fn.numPrev();i++) {
 171       FlatNode fprev=fn.getPrev(i);
 172       Hashtable<TempDescriptor, Set<TempFlatPair>> tabset=tmptofnset.get(fprev);
 173       if (tabset!=null) {
 174         for(Iterator<TempDescriptor> tmpit=tabset.keySet().iterator();tmpit.hasNext();) {
 175           TempDescriptor td=tmpit.next();
 176           Set<TempFlatPair> fnset=tabset.get(td);
 177           if (!table.containsKey(td))
 178             table.put(td, new HashSet<TempFlatPair>());
 179           table.get(td).addAll(fnset);
 180         }
 181       }
 182     }
 183     return table;
 184   }
 185
 186   public Set<FlatNode> getNeedSrcTrans(LocalityBinding lb) {
 187     return srcmap.get(lb);
 188   }
 189
 190   public boolean getNeedSrcTrans(LocalityBinding lb, FlatNode fn) {
 191     return srcmap.get(lb).contains(fn);
 192   }
 193
 194   public boolean getNeedLeftSrcTrans(LocalityBinding lb, FlatNode fn) {
 195     return leftsrcmap.get(lb).contains(fn);
 196   }
 197
 198   public boolean getNeedRightSrcTrans(LocalityBinding lb, FlatNode fn) {
 199     return rightsrcmap.get(lb).contains(fn);
 200   }
 201
 202   public boolean getNeedTrans(LocalityBinding lb, FlatNode fn) {
 203     return treadmap.get(lb).contains(fn);
 204   }
 205
 206   public boolean getNeedGet(LocalityBinding lb, FlatNode fn) {
 207     if (gft!=null)
 208       return getmap.get(lb).contains(fn);
 209     else throw new Error();
 210   }
 211
 212   public boolean getNeedWriteTrans(LocalityBinding lb, FlatNode fn) {
 213     if (gft!=null)
 214       return twritemap.get(lb).contains(fn);
 215     else throw new Error();
 216   }
 217
 218   public Hashtable<FlatNode, Hashtable<TempDescriptor, Set<TempFlatPair>>> getMap(LocalityBinding lb) {
 219     return lbtofnmap.get(lb);
 220   }
 221
 222   private void analyzeLocality(LocalityBinding lb) {
 223     MethodDescriptor md=lb.getMethod();
 224     FlatMethod fm=state.getMethodFlat(md);
 225
 226     //Compute map from flatnode -> (temps -> source of value)
 227     Hashtable<FlatNode, Hashtable<TempDescriptor, Set<TempFlatPair>>> fnmap=computeTempSets(lb);
 228     lbtofnmap.put(lb,fnmap);
 229     HashSet<TempFlatPair> writeset=null;
 230     if (gft!=null) {
 231       writeset=new HashSet<TempFlatPair>();
 232     }
 233     HashSet<TempFlatPair> tfset=computeTranslationSet(lb, fm, fnmap, writeset);
 234     if (gft!=null) {
 235       writemap.put(lb, writeset);
 236     }
 237
 238     HashSet<FlatNode> srctrans=new HashSet<FlatNode>();
 239     HashSet<FlatNode> leftsrctrans=new HashSet<FlatNode>();
 240     HashSet<FlatNode> rightsrctrans=new HashSet<FlatNode>();
 241     transreadmap.put(lb, tfset);
 242     srcmap.put(lb,srctrans);
 243     leftsrcmap.put(lb,leftsrctrans);
 244     rightsrcmap.put(lb,rightsrctrans);
 245
 246     //compute writes that need translation on source
 247     for(Iterator<FlatNode> fnit=fm.getNodeSet().iterator();fnit.hasNext();) {
 248       FlatNode fn=fnit.next();
 249       Hashtable<FlatNode, Integer> atomictable=locality.getAtomic(lb);
 250       if (atomictable.get(fn).intValue()>0) {
 251         Hashtable<TempDescriptor, Set<TempFlatPair>> tmap=fnmap.get(fn);
 252         switch(fn.kind()) {
 253           //We might need to translate arguments to pointer comparison
 254
 255         case FKind.FlatOpNode: {
 256           FlatOpNode fon=(FlatOpNode)fn;
 257           if (fon.getOp().getOp()==Operation.EQUAL||
 258               fon.getOp().getOp()==Operation.NOTEQUAL) {
 259             if (!fon.getLeft().getType().isPtr())
 260               break;
 261             Set<TempFlatPair> lefttfpset=tmap.get(fon.getLeft());
 262             Set<TempFlatPair> righttfpset=tmap.get(fon.getRight());
 263             //handle left operand
 264             if (lefttfpset!=null) {
 265               for(Iterator<TempFlatPair> tfpit=lefttfpset.iterator();tfpit.hasNext();) {
 266                 TempFlatPair tfp=tfpit.next();
 267                 if (tfset.contains(tfp)||outofscope(tfp)) {
 268                   leftsrctrans.add(fon);
 269                   break;
 270                 }
 271               }
 272             }
 273             //handle right operand
 274             if (righttfpset!=null) {
 275               for(Iterator<TempFlatPair> tfpit=righttfpset.iterator();tfpit.hasNext();) {
 276                 TempFlatPair tfp=tfpit.next();
 277                 if (tfset.contains(tfp)||outofscope(tfp)) {
 278                   rightsrctrans.add(fon);
 279                   break;
 280                 }
 281               }
 282             }
 283           }
 284           break;
 285         }
 286
 287         case FKind.FlatGlobalConvNode: {
 288           //need to translate these if the value we read from may be a
 289           //shadow...  check this by seeing if any of the values we
 290           //may read are in the transread set or came from our caller
 291           //or a method we called
 292
 293           FlatGlobalConvNode fgcn=(FlatGlobalConvNode)fn;
 294           if (fgcn.getLocality()!=lb||
 295               fgcn.getMakePtr())
 296             break;
 297
 298           Set<TempFlatPair> tfpset=tmap.get(fgcn.getSrc());
 299
 300           if (tfpset!=null) {
 301             for(Iterator<TempFlatPair> tfpit=tfpset.iterator();tfpit.hasNext();) {
 302               TempFlatPair tfp=tfpit.next();
 303               if (tfset.contains(tfp)||outofscope(tfp)) {
 304                 srctrans.add(fgcn);
 305                 break;
 306               }
 307             }
 308           }
 309           break;
 310         }
 311
 312         case FKind.FlatSetFieldNode: {
 313           //need to translate these if the value we read from may be a
 314           //shadow...  check this by seeing if any of the values we
 315           //may read are in the transread set or came from our caller
 316           //or a method we called
 317
 318           FlatSetFieldNode fsfn=(FlatSetFieldNode)fn;
 319           if (!fsfn.getField().getType().isPtr())
 320             break;
 321           Set<TempFlatPair> tfpset=tmap.get(fsfn.getSrc());
 322           if (tfpset!=null) {
 323             for(Iterator<TempFlatPair> tfpit=tfpset.iterator();tfpit.hasNext();) {
 324               TempFlatPair tfp=tfpit.next();
 325               if (tfset.contains(tfp)||outofscope(tfp)) {
 326                 srctrans.add(fsfn);
 327                 break;
 328               }
 329             }
 330           }
 331           break;
 332         }
 333         case FKind.FlatSetElementNode: {
 334           //need to translate these if the value we read from may be a
 335           //shadow...  check this by seeing if any of the values we
 336           //may read are in the transread set or came from our caller
 337           //or a method we called
 338
 339           FlatSetElementNode fsen=(FlatSetElementNode)fn;
 340           if (!fsen.getSrc().getType().isPtr())
 341             break;
 342           Set<TempFlatPair> tfpset=tmap.get(fsen.getSrc());
 343           if (tfpset!=null) {
 344             for(Iterator<TempFlatPair> tfpit=tfpset.iterator();tfpit.hasNext();) {
 345               TempFlatPair tfp=tfpit.next();
 346               if (tfset.contains(tfp)||outofscope(tfp)) {
 347                 srctrans.add(fsen);
 348                 break;
 349               }
 350             }
 351           }
 352           break;
 353         }
 354         default:
 355         }
 356       }
 357     }
 358     //Update results
 359     setNeedReadTrans(lb);
 360     computeneedsarrayget(lb, fnmap);
 361   }
 362
 363   public boolean outofscope(TempFlatPair tfp) {
 364     FlatNode fn=tfp.f;
 365     return fn.kind()==FKind.FlatCall||fn.kind()==FKind.FlatMethod;
 366   }
 367
 368   private void computeReadOnly(LocalityBinding lb, Hashtable<FlatNode, Set<TypeDescriptor>> updatedtypemap, Hashtable<FlatNode, Set<FieldDescriptor>> updatedfieldmap) {
 369     //inside of transaction, try to convert rw access to ro access
 370     MethodDescriptor md=lb.getMethod();
 371     FlatMethod fm=state.getMethodFlat(md);
 372     Hashtable<FlatNode, Integer> atomictable=locality.getAtomic(lb);
 373
 374     HashSet<FlatNode> toanalyze=new HashSet<FlatNode>();
 375     toanalyze.addAll(fm.getNodeSet());
 376
 377     while(!toanalyze.isEmpty()) {
 378       FlatNode fn=toanalyze.iterator().next();
 379       toanalyze.remove(fn);
 380       HashSet<TypeDescriptor> updatetypeset=new HashSet<TypeDescriptor>();
 381       HashSet<FieldDescriptor> updatefieldset=new HashSet<FieldDescriptor>();
 382
 383       //Stop if we aren't in a transaction
 384       if (atomictable.get(fn).intValue()==0)
 385         continue;
 386
 387       //Do merge of all exits
 388       for(int i=0;i<fn.numNext();i++) {
 389         FlatNode fnnext=fn.getNext(i);
 390         if (updatedtypemap.containsKey(fnnext)) {
 391           updatetypeset.addAll(updatedtypemap.get(fnnext));
 392         }
 393         if (updatedfieldmap.containsKey(fnnext)) {
 394           updatefieldset.addAll(updatedfieldmap.get(fnnext));
 395         }
 396       }
 397
 398       //process this node
 399       if (cannotdelaymap!=null&&cannotdelaymap.containsKey(lb)&&cannotdelaymap.get(lb).contains(fn)!=inclusive) {
 400         switch(fn.kind()) {
 401         case FKind.FlatSetFieldNode: {
 402           FlatSetFieldNode fsfn=(FlatSetFieldNode)fn;
 403           updatefieldset.add(fsfn.getField());
 404           break;
 405         }
 406         case FKind.FlatSetElementNode: {
 407           FlatSetElementNode fsen=(FlatSetElementNode)fn;
 408           updatetypeset.addAll(typeanalysis.expand(fsen.getDst().getType()));
 409           break;
 410         }
 411         case FKind.FlatCall: {
 412           FlatCall fcall=(FlatCall)fn;
 413           MethodDescriptor mdfc=fcall.getMethod();
 414
 415           //get modified fields
 416           Set<FieldDescriptor> fields=gft.getFieldsAll(mdfc);
 417           updatefieldset.addAll(fields);
 418
 419           //get modified arrays
 420           Set<TypeDescriptor> arrays=gft.getArraysAll(mdfc);
 421           updatetypeset.addAll(typeanalysis.expandSet(arrays));
 422           break;
 423         }
 424         }
 425       }
 426
 427       if (!updatedtypemap.containsKey(fn)||!updatedfieldmap.containsKey(fn)||
 428           !updatedtypemap.get(fn).equals(updatetypeset)||!updatedfieldmap.get(fn).equals(updatefieldset)) {
 429         updatedtypemap.put(fn, updatetypeset);
 430         updatedfieldmap.put(fn, updatefieldset);
 431         for(int i=0;i<fn.numPrev();i++) {
 432           toanalyze.add(fn.getPrev(i));
 433         }
 434       }
 435     }
 436   }
 437
 438
 439   /** Need to figure out which nodes need a transread to make local
 440   copies.  Transread conceptually tracks conflicts.  This depends on
 441   what fields/elements are accessed We iterate over all flatnodes that
 442   access fields...If these accesses could conflict, we mark the source
 443   tempflat pair as needing a transread */
 444
 445
 446   HashSet<TempFlatPair> computeTranslationSet(LocalityBinding lb, FlatMethod fm, Hashtable<FlatNode, Hashtable<TempDescriptor, Set<TempFlatPair>>> fnmap, Set<TempFlatPair> writeset) {
 447     HashSet<TempFlatPair> tfset=new HashSet<TempFlatPair>();
 448
 449     //Compute maps from flatnodes -> sets of things that may be updated after this node
 450     Hashtable<FlatNode, Set<TypeDescriptor>> updatedtypemap=null;
 451     Hashtable<FlatNode, Set<FieldDescriptor>> updatedfieldmap=null;
 452
 453     if (writeset!=null&&!lb.isAtomic()) {
 454       updatedtypemap=new Hashtable<FlatNode, Set<TypeDescriptor>>();
 455       updatedfieldmap=new Hashtable<FlatNode, Set<FieldDescriptor>>();
 456       computeReadOnly(lb, updatedtypemap, updatedfieldmap);
 457     }
 458
 459     for(Iterator<FlatNode> fnit=fm.getNodeSet().iterator();fnit.hasNext();) {
 460       FlatNode fn=fnit.next();
 461       //Check whether this node matters for cannot delayed computation
 462       if (cannotdelaymap!=null&&cannotdelaymap.containsKey(lb)&&cannotdelaymap.get(lb).contains(fn)==inclusive)
 463         continue;
 464
 465       Hashtable<FlatNode, Integer> atomictable=locality.getAtomic(lb);
 466       if (atomictable.get(fn).intValue()>0) {
 467         Hashtable<TempDescriptor, Set<TempFlatPair>> tmap=fnmap.get(fn);
 468         switch(fn.kind()) {
 469         case FKind.FlatElementNode: {
 470           FlatElementNode fen=(FlatElementNode)fn;
 471           if (arrays.contains(fen.getSrc().getType())) {
 472             //this could cause conflict...figure out conflict set
 473             Set<TempFlatPair> tfpset=tmap.get(fen.getSrc());
 474             if (tfpset!=null)
 475               tfset.addAll(tfpset);
 476           }
 477           if (updatedtypemap!=null&&updatedtypemap.get(fen).contains(fen.getSrc().getType())) {
 478             //this could cause conflict...figure out conflict set
 479             Set<TempFlatPair> tfpset=tmap.get(fen.getSrc());
 480             if (tfpset!=null)
 481               tfset.addAll(tfpset);
 482           }
 483           break;
 484         }
 485         case FKind.FlatFieldNode: {
 486           FlatFieldNode ffn=(FlatFieldNode)fn;
 487           if (fields.contains(ffn.getField())) {
 488             //this could cause conflict...figure out conflict set
 489             Set<TempFlatPair> tfpset=tmap.get(ffn.getSrc());
 490             if (tfpset!=null)
 491               tfset.addAll(tfpset);
 492           }
 493           if (updatedfieldmap!=null&&updatedfieldmap.get(ffn).contains(ffn.getField())) {
 494             //this could cause conflict...figure out conflict set
 495             Set<TempFlatPair> tfpset=tmap.get(ffn.getSrc());
 496             if (tfpset!=null)
 497               tfset.addAll(tfpset);
 498           }
 499           break;
 500         }
 501         case FKind.FlatSetFieldNode: {
 502           //definitely need to translate these
 503           FlatSetFieldNode fsfn=(FlatSetFieldNode)fn;
 504           Set<TempFlatPair> tfpset=tmap.get(fsfn.getDst());
 505           if (tfpset!=null)
 506             tfset.addAll(tfpset);
 507           if (writeset!=null) {
 508             if (tfpset!=null)
 509               writeset.addAll(tfpset);
 510           }
 511           break;
 512         }
 513         case FKind.FlatSetElementNode: {
 514           //definitely need to translate these
 515           FlatSetElementNode fsen=(FlatSetElementNode)fn;
 516           Set<TempFlatPair> tfpset=tmap.get(fsen.getDst());
 517           if (tfpset!=null)
 518             tfset.addAll(tfpset);
 519           if (writeset!=null) {
 520             if (tfpset!=null)
 521               writeset.addAll(tfpset);
 522           }
 523           break;
 524         }
 525         case FKind.FlatCall: //assume pessimistically that calls do bad things
 526         case FKind.FlatReturnNode: {
 527           TempDescriptor []readarray=fn.readsTemps();
 528           for(int i=0;i<readarray.length;i++) {
 529             TempDescriptor rtmp=readarray[i];
 530             Set<TempFlatPair> tfpset=tmap.get(rtmp);
 531             if (tfpset!=null)
 532               tfset.addAll(tfpset);
 533             if (writeset!=null) {
 534               if (tfpset!=null)
 535                 writeset.addAll(tfpset);
 536             }
 537           }
 538           break;
 539         }
 540         default:
 541           //do nothing
 542         }
 543       }
 544     }
 545     return tfset;
 546   }
 547
 548
 549   //This method generates as output for each node
 550   //A map from from temps to a set of temp/flat pairs that the
 551   //original temp points to
 552   //A temp/flat pair gives the flatnode that the value was created at
 553   //and the original temp
 554
 555   Hashtable<FlatNode, Hashtable<TempDescriptor, Set<TempFlatPair>>> computeTempSets(LocalityBinding lb) {
 556     Hashtable<FlatNode, Hashtable<TempDescriptor, Set<TempFlatPair>>> tmptofnset=new Hashtable<FlatNode, Hashtable<TempDescriptor, Set<TempFlatPair>>>();
 557     HashSet<FlatNode> discovered=new HashSet<FlatNode>();
 558     HashSet<FlatNode> tovisit=new HashSet<FlatNode>();
 559     MethodDescriptor md=lb.getMethod();
 560     FlatMethod fm=state.getMethodFlat(md);
 561     Hashtable<FlatNode, Integer> atomictable=locality.getAtomic(lb);
 562     Hashtable<FlatNode, Set<TempDescriptor>> livetemps=Liveness.computeLiveTemps(fm);
 563     tovisit.add(fm);
 564     discovered.add(fm);
 565
 566     while(!tovisit.isEmpty()) {
 567       FlatNode fn=tovisit.iterator().next();
 568       tovisit.remove(fn);
 569       for(int i=0;i<fn.numNext();i++) {
 570         FlatNode fnext=fn.getNext(i);
 571         if (!discovered.contains(fnext)) {
 572           discovered.add(fnext);
 573           tovisit.add(fnext);
 574         }
 575       }
 576       Hashtable<TempDescriptor, Set<TempFlatPair>> ttofn=null;
 577       if (atomictable.get(fn).intValue()!=0) {
 578         if ((fn.numPrev()>0)&&atomictable.get(fn.getPrev(0)).intValue()==0) {
 579           //atomic node, start with new set
 580           ttofn=new Hashtable<TempDescriptor, Set<TempFlatPair>>();
 581         } else {
 582           ttofn=doMerge(fn, tmptofnset);
 583           switch(fn.kind()) {
 584           case FKind.FlatGlobalConvNode: {
 585             FlatGlobalConvNode fgcn=(FlatGlobalConvNode)fn;
 586             if (lb==fgcn.getLocality()&&
 587                 fgcn.getMakePtr()) {
 588               TempDescriptor[] writes=fn.writesTemps();
 589               for(int i=0;i<writes.length;i++) {
 590                 TempDescriptor wtmp=writes[i];
 591                 HashSet<TempFlatPair> set=new HashSet<TempFlatPair>();
 592                 set.add(new TempFlatPair(wtmp, fn));
 593                 ttofn.put(wtmp, set);
 594               }
 595             }
 596             break;
 597           }
 598           case FKind.FlatFieldNode:
 599           case FKind.FlatElementNode: {
 600             TempDescriptor[] writes=fn.writesTemps();
 601             for(int i=0;i<writes.length;i++) {
 602               TempDescriptor wtmp=writes[i];
 603               HashSet<TempFlatPair> set=new HashSet<TempFlatPair>();
 604               set.add(new TempFlatPair(wtmp, fn));
 605               ttofn.put(wtmp, set);
 606             }
 607             break;
 608           }
 609           case FKind.FlatCall:
 610           case FKind.FlatMethod: {
 611             TempDescriptor[] writes=fn.writesTemps();
 612             for(int i=0;i<writes.length;i++) {
 613               TempDescriptor wtmp=writes[i];
 614               HashSet<TempFlatPair> set=new HashSet<TempFlatPair>();
 615               set.add(new TempFlatPair(wtmp, fn));
 616               ttofn.put(wtmp, set);
 617             }
 618             break;
 619           }
 620           case FKind.FlatCastNode:
 621           case FKind.FlatOpNode:
 622             if (fn.kind()==FKind.FlatCastNode) {
 623               FlatCastNode fcn=(FlatCastNode)fn;
 624               if (fcn.getDst().getType().isPtr()) {
 625                 HashSet<TempFlatPair> set=new HashSet<TempFlatPair>();
 626                 if (ttofn.containsKey(fcn.getSrc()))
 627                   set.addAll(ttofn.get(fcn.getSrc()));
 628                 if (normalassign)
 629                   set.add(new TempFlatPair(fcn.getDst(), fn));
 630                 ttofn.put(fcn.getDst(), set);
 631                 break;
 632               }
 633             } else if (fn.kind()==FKind.FlatOpNode) {
 634               FlatOpNode fon=(FlatOpNode)fn;
 635               if (fon.getOp().getOp()==Operation.ASSIGN&&fon.getDest().getType().isPtr()) {
 636                 HashSet<TempFlatPair> set=new HashSet<TempFlatPair>();
 637                 if (ttofn.containsKey(fon.getLeft()))
 638                   set.addAll(ttofn.get(fon.getLeft()));
 639                 if (normalassign)
 640                   set.add(new TempFlatPair(fon.getDest(), fn));
 641                 ttofn.put(fon.getDest(), set);
 642                 break;
 643               }
 644             }
 645           default:
 646             //Do kill computation
 647             TempDescriptor[] writes=fn.writesTemps();
 648             for(int i=0;i<writes.length;i++) {
 649               TempDescriptor wtmp=writes[i];
 650               ttofn.remove(writes[i]);
 651             }
 652           }
 653         }
 654         if (ttofn!=null) {
 655           if (!tmptofnset.containsKey(fn)||
 656               !tmptofnset.get(fn).equals(ttofn)) {
 657             //enqueue nodes to process
 658             tmptofnset.put(fn, ttofn);
 659             for(int i=0;i<fn.numNext();i++) {
 660               FlatNode fnext=fn.getNext(i);
 661               tovisit.add(fnext);
 662             }
 663           }
 664         }
 665       }
 666     }
 667     return tmptofnset;
 668   }
 669
 670   /* See what fields and arrays transactions might modify.  We only
 671    * look at changes to old objects. */
 672
 673   //Bug fix: original version forget to check if object is new and
 674   //could be optimized
 675
 676   public void computeModified(LocalityBinding lb) {
 677     MethodDescriptor md=lb.getMethod();
 678     FlatMethod fm=state.getMethodFlat(md);
 679     Hashtable<FlatNode, Set<TempDescriptor>> oldtemps=computeOldTemps(lb);
 680     for(Iterator<FlatNode> fnit=fm.getNodeSet().iterator();fnit.hasNext();) {
 681       FlatNode fn=fnit.next();
 682       Hashtable<FlatNode, Integer> atomictable=locality.getAtomic(lb);
 683       if (atomictable.get(fn).intValue()>0) {
 684         Set<TempDescriptor> oldtemp=oldtemps.get(fn);
 685         switch (fn.kind()) {
 686         case FKind.FlatSetFieldNode:
 687           FlatSetFieldNode fsfn=(FlatSetFieldNode) fn;
 688           if (oldtemp.contains(fsfn.getDst()))
 689             fields.add(fsfn.getField());
 690           break;
 691         case FKind.FlatSetElementNode:
 692           FlatSetElementNode fsen=(FlatSetElementNode) fn;
 693           if (oldtemp.contains(fsen.getDst()))
 694             arrays.add(fsen.getDst().getType());
 695           break;
 696         default:
 697         }
 698       }
 699     }
 700   }
 701
 702
 703   //Returns a table that maps a flatnode to a set of temporaries
 704   //This set of temporaries is old (meaning they may point to object
 705   //allocated before the beginning of the current transaction
 706
 707   Hashtable<FlatNode, Set<TempDescriptor>> computeOldTemps(LocalityBinding lb) {
 708     Hashtable<FlatNode, Set<TempDescriptor>> fntooldtmp=new Hashtable<FlatNode, Set<TempDescriptor>>();
 709     HashSet<FlatNode> discovered=new HashSet<FlatNode>();
 710     HashSet<FlatNode> tovisit=new HashSet<FlatNode>();
 711     MethodDescriptor md=lb.getMethod();
 712     FlatMethod fm=state.getMethodFlat(md);
 713     Hashtable<FlatNode, Integer> atomictable=locality.getAtomic(lb);
 714     Hashtable<FlatNode, Set<TempDescriptor>> livetemps=Liveness.computeLiveTemps(fm);
 715     tovisit.add(fm);
 716     discovered.add(fm);
 717
 718     while(!tovisit.isEmpty()) {
 719       FlatNode fn=tovisit.iterator().next();
 720       tovisit.remove(fn);
 721       for(int i=0;i<fn.numNext();i++) {
 722         FlatNode fnext=fn.getNext(i);
 723         if (!discovered.contains(fnext)) {
 724           discovered.add(fnext);
 725           tovisit.add(fnext);
 726         }
 727       }
 728       HashSet<TempDescriptor> oldtemps=null;
 729       if (atomictable.get(fn).intValue()!=0) {
 730         if ((fn.numPrev()>0)&&atomictable.get(fn.getPrev(0)).intValue()==0) {
 731           //Everything live is old
 732           Set<TempDescriptor> lives=livetemps.get(fn);
 733           oldtemps=new HashSet<TempDescriptor>();
 734
 735           for(Iterator<TempDescriptor> it=lives.iterator();it.hasNext();) {
 736             TempDescriptor tmp=it.next();
 737             if (tmp.getType().isPtr()) {
 738               oldtemps.add(tmp);
 739             }
 740           }
 741         } else {
 742           oldtemps=new HashSet<TempDescriptor>();
 743           //Compute union of old temporaries
 744           for(int i=0;i<fn.numPrev();i++) {
 745             Set<TempDescriptor> pset=fntooldtmp.get(fn.getPrev(i));
 746             if (pset!=null)
 747               oldtemps.addAll(pset);
 748           }
 749
 750           switch (fn.kind()) {
 751           case FKind.FlatNew:
 752             oldtemps.removeAll(Arrays.asList(fn.readsTemps()));
 753             break;
 754           case FKind.FlatOpNode:
 755           case FKind.FlatCastNode:
 756             if (fn.kind()==FKind.FlatCastNode) {
 757               FlatCastNode fcn=(FlatCastNode)fn;
 758               if (fcn.getDst().getType().isPtr()) {
 759                 if (oldtemps.contains(fcn.getSrc()))
 760                   oldtemps.add(fcn.getDst());
 761                 else
 762                   oldtemps.remove(fcn.getDst());
 763                 break;
 764               }
 765             } else if (fn.kind()==FKind.FlatOpNode) {
 766               FlatOpNode fon=(FlatOpNode)fn;
 767               if (fon.getOp().getOp()==Operation.ASSIGN&&fon.getDest().getType().isPtr()) {
 768                 if (oldtemps.contains(fon.getLeft()))
 769                   oldtemps.add(fon.getDest());
 770                 else
 771                   oldtemps.remove(fon.getDest());
 772                 break;
 773               }
 774             }
 775           default: {
 776             TempDescriptor[] writes=fn.writesTemps();
 777             for(int i=0;i<writes.length;i++) {
 778               TempDescriptor wtemp=writes[i];
 779               if (wtemp.getType().isPtr())
 780                 oldtemps.add(wtemp);
 781             }
 782           }
 783           }
 784         }
 785       }
 786
 787       if (oldtemps!=null) {
 788         if (!fntooldtmp.containsKey(fn)||!fntooldtmp.get(fn).equals(oldtemps)) {
 789           fntooldtmp.put(fn, oldtemps);
 790           //propagate changes
 791           for(int i=0;i<fn.numNext();i++) {
 792             FlatNode fnext=fn.getNext(i);
 793             tovisit.add(fnext);
 794           }
 795         }
 796       }
 797     }
 798     return fntooldtmp;
 799   }
 800 }
 801
 802 class TempFlatPair {
 803   FlatNode f;
 804   TempDescriptor t;
 805   TempFlatPair(TempDescriptor t, FlatNode f) {
 806     this.t=t;
 807     this.f=f;
 808   }
 809
 810   public int hashCode() {
 811     return f.hashCode()^t.hashCode();
 812   }
 813   public boolean equals(Object o) {
 814     TempFlatPair tf=(TempFlatPair)o;
 815     return t.equals(tf.t)&&f.equals(tf.f);
 816   }
 817   public String toString() {
 818     return f.toString()+" "+t.toString();
 819   }
 820 }