Programming Languages Research Group: Git - IRC.git/blob

   1 package Analysis.Locality;
   2
   3 import java.util.*;
   4 import Analysis.CallGraph.CallGraph;
   5 import IR.SymbolTable;
   6 import IR.State;
   7 import IR.TypeUtil;
   8 import IR.MethodDescriptor;
   9 import IR.Flat.*;
  10 import IR.ClassDescriptor;
  11
  12 public class LocalityAnalysis {
  13     State state;
  14     Stack lbtovisit;
  15     Hashtable<LocalityBinding,LocalityBinding> discovered;
  16     Hashtable<LocalityBinding, Set<LocalityBinding>> dependence;
  17     Hashtable<LocalityBinding, Hashtable<FlatNode,Hashtable<TempDescriptor, Integer>>> temptab;
  18     Hashtable<LocalityBinding, Hashtable<FlatNode, Integer>> atomictab;
  19     Hashtable<LocalityBinding, Hashtable<FlatAtomicEnterNode, Set<TempDescriptor>>> tempstosave;
  20     Hashtable<ClassDescriptor, Set<LocalityBinding>> classtolb;
  21     Hashtable<MethodDescriptor, Set<LocalityBinding>> methodtolb;
  22     private LocalityBinding lbmain;
  23
  24     CallGraph callgraph;
  25     TypeUtil typeutil;
  26     public static final Integer LOCAL=new Integer(0);
  27     public static final Integer GLOBAL=new Integer(1);
  28     public static final Integer EITHER=new Integer(2);
  29     public static final Integer CONFLICT=new Integer(3);
  30
  31     public LocalityAnalysis(State state, CallGraph callgraph, TypeUtil typeutil) {
  32         this.typeutil=typeutil;
  33         this.state=state;
  34         this.discovered=new Hashtable<LocalityBinding,LocalityBinding>();
  35         this.dependence=new Hashtable<LocalityBinding, Set<LocalityBinding>>();
  36         this.temptab=new Hashtable<LocalityBinding, Hashtable<FlatNode,Hashtable<TempDescriptor, Integer>>>();
  37         this.atomictab=new Hashtable<LocalityBinding, Hashtable<FlatNode, Integer>>();
  38         this.lbtovisit=new Stack();
  39         this.callgraph=callgraph;
  40         this.tempstosave=new Hashtable<LocalityBinding, Hashtable<FlatAtomicEnterNode, Set<TempDescriptor>>>();
  41         this.classtolb=new Hashtable<ClassDescriptor, Set<LocalityBinding>>();
  42         this.methodtolb=new Hashtable<MethodDescriptor, Set<LocalityBinding>>();
  43         doAnalysis();
  44     }
  45
  46     public LocalityBinding getMain() {
  47         return lbmain;
  48     }
  49
  50     /** This method returns the set of LocalityBindings that a given
  51      * flatcall could invoke */
  52
  53     public LocalityBinding getBinding(LocalityBinding currlb, FlatCall fc) {
  54         boolean isatomic=getAtomic(currlb).get(fc).intValue()>0;
  55         Hashtable<TempDescriptor, Integer> currtable=getNodePreTempInfo(currlb,fc);
  56         MethodDescriptor md=fc.getMethod();
  57
  58         boolean isnative=md.getModifiers().isNative();
  59
  60         LocalityBinding lb=new LocalityBinding(md, isatomic);
  61
  62         for(int i=0;i<fc.numArgs();i++) {
  63             TempDescriptor arg=fc.getArg(i);
  64             lb.setGlobal(i,currtable.get(arg));
  65         }
  66         if (fc.getThis()!=null) {
  67             Integer thistype=currtable.get(fc.getThis());
  68             if (thistype==null)
  69                 thistype=EITHER;
  70             lb.setGlobalThis(thistype);
  71         }// else
  72         // lb.setGlobalThis(EITHER);//default value
  73         if (discovered.containsKey(lb))
  74             lb=discovered.get(lb);
  75         else throw new Error();
  76         return lb;
  77     }
  78
  79
  80     /** This method returns a set of LocalityBindings for the parameter class. */
  81     public Set<LocalityBinding> getClassBindings(ClassDescriptor cd) {
  82         return classtolb.get(cd);
  83     }
  84
  85     /** This method returns a set of LocalityBindings for the parameter method. */
  86
  87     public Set<LocalityBinding> getMethodBindings(MethodDescriptor md) {
  88         return methodtolb.get(md);
  89     }
  90
  91     /** This method returns a set of LocalityBindings.  A
  92      * LocalityBinding specifies a context a method can be invoked in.
  93      * It specifies whether the method is in a transaction and whether
  94      * its parameter objects are locals or globals.  */
  95
  96     public Set<LocalityBinding> getLocalityBindings() {
  97         return discovered.keySet();
  98     }
  99
 100     /** This method returns a hashtable for a given LocalityBinding
 101      * that tells the current local/global status of temps at the each
 102      * node in the flat representation. */
 103
 104     public Hashtable<FlatNode, Hashtable<TempDescriptor, Integer>> getNodeTempInfo(LocalityBinding lb) {
 105         return temptab.get(lb);
 106     }
 107
 108     /** This method returns a hashtable for a given LocalityBinding
 109      * that tells the current local/global status of temps at the
 110      * beginning of each node in the flat representation. */
 111
 112     public Hashtable<TempDescriptor, Integer> getNodePreTempInfo(LocalityBinding lb, FlatNode fn) {
 113         Hashtable<TempDescriptor, Integer> currtable=new Hashtable<TempDescriptor, Integer>();
 114         Hashtable<FlatNode, Hashtable<TempDescriptor, Integer>> temptable=getNodeTempInfo(lb);
 115
 116         for(int i=0;i<fn.numPrev();i++) {
 117             FlatNode prevnode=fn.getPrev(i);
 118             Hashtable<TempDescriptor, Integer> prevtable=temptable.get(prevnode);
 119             for(Iterator<TempDescriptor> tempit=prevtable.keySet().iterator();tempit.hasNext();) {
 120                 TempDescriptor temp=tempit.next();
 121                 Integer tmpint=prevtable.get(temp);
 122                 Integer oldint=currtable.containsKey(temp)?currtable.get(temp):EITHER;
 123                 Integer newint=merge(tmpint, oldint);
 124                 currtable.put(temp, newint);
 125             }
 126         }
 127         return currtable;
 128     }
 129
 130     /** This method returns an hashtable for a given LocalitBinding
 131      * that tells whether a node in the flat represenation is in a
 132      * transaction or not.  Integer values greater than 0 indicate
 133      * that the node is in a transaction and give the nesting depth.
 134      * The outermost AtomicEnterNode will have a value of 1 and the
 135      * outermost AtomicExitNode will have a value of 0. */
 136
 137     public Hashtable<FlatNode, Integer> getAtomic(LocalityBinding lb) {
 138         return atomictab.get(lb);
 139     }
 140
 141     /** This methods returns a hashtable for a given LocalityBinding
 142      * that tells which temps needs to be saved for each
 143      * AtomicEnterNode.  */
 144
 145     public Hashtable<FlatAtomicEnterNode, Set<TempDescriptor>> getTemps(LocalityBinding lb) {
 146         return tempstosave.get(lb);
 147     }
 148
 149     public Set<TempDescriptor> getTempSet(LocalityBinding lb) {
 150         HashSet<TempDescriptor> set=new HashSet<TempDescriptor>();
 151         Hashtable<FlatAtomicEnterNode, Set<TempDescriptor>> table=getTemps(lb);
 152         if (table!=null)
 153             for(Iterator<FlatAtomicEnterNode> faenit=table.keySet().iterator();faenit.hasNext();) {
 154                 FlatAtomicEnterNode faen=faenit.next();
 155                 set.addAll(table.get(faen));
 156             }
 157         return set;
 158     }
 159
 160     private void doAnalysis() {
 161         computeLocalityBindings();
 162         computeTempstoSave();
 163     }
 164
 165     private void computeLocalityBindings() {
 166         lbmain=new LocalityBinding(typeutil.getMain(), false);
 167         lbmain.setGlobalReturn(EITHER);
 168         lbmain.setGlobal(0, LOCAL);
 169         lbtovisit.add(lbmain);
 170         discovered.put(lbmain, lbmain);
 171         if (!classtolb.containsKey(lbmain.getMethod().getClassDesc()))
 172             classtolb.put(lbmain.getMethod().getClassDesc(), new HashSet<LocalityBinding>());
 173         classtolb.get(lbmain.getMethod().getClassDesc()).add(lbmain);
 174
 175         if (!methodtolb.containsKey(lbmain.getMethod()))
 176             methodtolb.put(lbmain.getMethod(), new HashSet<LocalityBinding>());
 177         methodtolb.get(lbmain.getMethod()).add(lbmain);
 178
 179         //Do this to force a virtual table number for the run method
 180         LocalityBinding lbrun=new LocalityBinding(typeutil.getRun(), false);
 181         lbrun.setGlobalReturn(EITHER);
 182         lbrun.setGlobalThis(GLOBAL);
 183         lbtovisit.add(lbrun);
 184         discovered.put(lbrun, lbrun);
 185         if (!classtolb.containsKey(lbrun.getMethod().getClassDesc()))
 186             classtolb.put(lbrun.getMethod().getClassDesc(), new HashSet<LocalityBinding>());
 187         classtolb.get(lbrun.getMethod().getClassDesc()).add(lbrun);
 188
 189         if (!methodtolb.containsKey(lbrun.getMethod()))
 190             methodtolb.put(lbrun.getMethod(), new HashSet<LocalityBinding>());
 191         methodtolb.get(lbrun.getMethod()).add(lbrun);
 192
 193         while(!lbtovisit.empty()) {
 194             LocalityBinding lb=(LocalityBinding) lbtovisit.pop();
 195             Integer returnglobal=lb.getGlobalReturn();
 196             MethodDescriptor md=lb.getMethod();
 197             Hashtable<FlatNode,Hashtable<TempDescriptor, Integer>> temptable=new Hashtable<FlatNode,Hashtable<TempDescriptor, Integer>>();
 198             Hashtable<FlatNode, Integer> atomictable=new Hashtable<FlatNode, Integer>();
 199             computeCallsFlags(md, lb, temptable, atomictable);
 200             atomictab.put(lb, atomictable);
 201             temptab.put(lb, temptable);
 202
 203             if (md.getReturnType()!=null&&!returnglobal.equals(lb.getGlobalReturn())) {
 204                 //return type is more precise now
 205                 //rerun everything that call us
 206                 lbtovisit.addAll(dependence.get(lb));
 207             }
 208         }
 209     }
 210
 211     public void computeCallsFlags(MethodDescriptor md, LocalityBinding lb, Hashtable<FlatNode, Hashtable<TempDescriptor, Integer>> temptable, Hashtable<FlatNode, Integer> atomictable) {
 212         FlatMethod fm=state.getMethodFlat(md);
 213         HashSet<FlatNode> tovisit=new HashSet<FlatNode>();
 214         tovisit.add(fm.getNext(0));
 215         {
 216             // Build table for initial node
 217             Hashtable<TempDescriptor,Integer> table=new Hashtable<TempDescriptor,Integer>();
 218             temptable.put(fm, table);
 219             atomictable.put(fm, lb.isAtomic()?1:0);
 220             int offset=md.isStatic()?0:1;
 221             if (!md.isStatic()) {
 222                 table.put(fm.getParameter(0), lb.getGlobalThis());
 223             }
 224             for(int i=offset;i<fm.numParameters();i++) {
 225                 TempDescriptor temp=fm.getParameter(i);
 226                 Integer b=lb.isGlobal(i-offset);
 227                 table.put(temp,b);
 228             }
 229         }
 230
 231         while(!tovisit.isEmpty()) {
 232             FlatNode fn=tovisit.iterator().next();
 233             tovisit.remove(fn);
 234             Hashtable<TempDescriptor, Integer> currtable=new Hashtable<TempDescriptor, Integer>();
 235             int atomicstate=0;
 236             for(int i=0;i<fn.numPrev();i++) {
 237                 FlatNode prevnode=fn.getPrev(i);
 238                 if (atomictable.containsKey(prevnode)) {
 239                     atomicstate=atomictable.get(prevnode).intValue();
 240                 }
 241                 if (!temptable.containsKey(prevnode))
 242                     continue;
 243                 Hashtable<TempDescriptor, Integer> prevtable=temptable.get(prevnode);
 244                 for(Iterator<TempDescriptor> tempit=prevtable.keySet().iterator();tempit.hasNext();) {
 245                     TempDescriptor temp=tempit.next();
 246                     Integer tmpint=prevtable.get(temp);
 247                     Integer oldint=currtable.containsKey(temp)?currtable.get(temp):EITHER;
 248                     Integer newint=merge(tmpint, oldint);
 249                     currtable.put(temp, newint);
 250                 }
 251             }
 252             atomictable.put(fn, atomicstate);
 253             // Process this node
 254             switch(fn.kind()) {
 255             case FKind.FlatAtomicEnterNode:
 256                 processAtomicEnterNode((FlatAtomicEnterNode)fn, atomictable);
 257                 if (!lb.isAtomic())
 258                     lb.setHasAtomic();
 259                 break;
 260             case FKind.FlatAtomicExitNode:
 261                 processAtomicExitNode((FlatAtomicExitNode)fn, atomictable);
 262                 break;
 263             case FKind.FlatCall:
 264                 processCallNode(lb, (FlatCall)fn, currtable, isAtomic(atomictable, fn));
 265                 break;
 266             case FKind.FlatFieldNode:
 267                 processFieldNode(lb, (FlatFieldNode)fn, isAtomic(atomictable, fn), currtable);
 268                 break;
 269             case FKind.FlatSetFieldNode:
 270                 processSetFieldNode(lb, (FlatSetFieldNode)fn, isAtomic(atomictable,fn), currtable);
 271                 break;
 272             case FKind.FlatNew:
 273                 processNew(lb, (FlatNew)fn, isAtomic(atomictable, fn), currtable);
 274                 break;
 275             case FKind.FlatOpNode:
 276                 processOpNode((FlatOpNode)fn, currtable);
 277                 break;
 278             case FKind.FlatCastNode:
 279                 processCastNode((FlatCastNode)fn, currtable);
 280                 break;
 281             case FKind.FlatLiteralNode:
 282                 processLiteralNode((FlatLiteralNode)fn, currtable);
 283                 break;
 284             case FKind.FlatReturnNode:
 285                 processReturnNode(lb, (FlatReturnNode)fn, currtable);
 286                 break;
 287             case FKind.FlatSetElementNode:
 288                 processSetElementNode(lb, (FlatSetElementNode)fn, currtable, isAtomic(atomictable, fn));
 289                 break;
 290             case FKind.FlatElementNode:
 291                 processElementNode(lb, (FlatElementNode)fn, currtable, isAtomic(atomictable, fn));
 292                 break;
 293             case FKind.FlatCondBranch:
 294             case FKind.FlatBackEdge:
 295             case FKind.FlatNop:
 296             case FKind.FlatPrefetchNode:
 297                 //No action needed for these
 298                 break;
 299             case FKind.FlatFlagActionNode:
 300             case FKind.FlatCheckNode:
 301             case FKind.FlatTagDeclaration:
 302                 throw new Error("Incompatible with tasks!");
 303             case FKind.FlatMethod:
 304             default:
 305                 throw new Error();
 306             }
 307             Hashtable<TempDescriptor,Integer> oldtable=temptable.get(fn);
 308             if (oldtable==null||!oldtable.equals(currtable)) {
 309                 // Update table for this node
 310                 temptable.put(fn, currtable);
 311                 for(int i=0;i<fn.numNext();i++) {
 312                     tovisit.add(fn.getNext(i));
 313                 }
 314             }
 315         }
 316     }
 317
 318     private static boolean isAtomic(Hashtable<FlatNode, Integer> atomictable, FlatNode fn) {
 319         return atomictable.get(fn).intValue()>0;
 320     }
 321
 322     private static Integer merge(Integer a, Integer b) {
 323         if (a==null||a.equals(EITHER))
 324             return b;
 325         if (b==null||b.equals(EITHER))
 326             return a;
 327         if (a.equals(b))
 328             return a;
 329         return CONFLICT;
 330     }
 331
 332     void processCallNode(LocalityBinding currlb, FlatCall fc, Hashtable<TempDescriptor, Integer> currtable, boolean isatomic) {
 333         MethodDescriptor nodemd=fc.getMethod();
 334         Set methodset=null;
 335         Set runmethodset=null;
 336
 337         if (nodemd.isStatic()||nodemd.getReturnType()==null) {
 338             methodset=new HashSet();
 339             methodset.add(nodemd);
 340         } else {
 341             methodset=callgraph.getMethods(nodemd, fc.getThis().getType());
 342             // Build start -> run link
 343             if (nodemd.getClassDesc().getSymbol().equals(TypeUtil.ThreadClass)&&
 344                 nodemd.getSymbol().equals("start")&&!nodemd.getModifiers().isStatic()&&
 345                 nodemd.numParameters()==1&&nodemd.getParamType(0).isInt()) {
 346                 assert(nodemd.getModifiers().isNative());
 347
 348                 MethodDescriptor runmd=null;
 349                 for(Iterator methodit=nodemd.getClassDesc().getMethodTable().getSet("run").iterator();methodit.hasNext();) {
 350                     MethodDescriptor md=(MethodDescriptor) methodit.next();
 351                     if (md.numParameters()!=0||md.getModifiers().isStatic())
 352                         continue;
 353                     runmd=md;
 354                     break;
 355                 }
 356                 if (runmd!=null) {
 357                     runmethodset=callgraph.getMethods(runmd,fc.getThis().getType());
 358                     methodset.addAll(runmethodset);
 359                 } else throw new Error("Can't find run method");
 360             }
 361         }
 362
 363         Integer currreturnval=EITHER; //Start off with the either value
 364         for(Iterator methodit=methodset.iterator();methodit.hasNext();) {
 365             MethodDescriptor md=(MethodDescriptor) methodit.next();
 366             boolean isnative=md.getModifiers().isNative();
 367             boolean isjoin = md.getClassDesc().getSymbol().equals(TypeUtil.ThreadClass)&&!nodemd.getModifiers().isStatic()&&nodemd.numParameters()==0&&md.getSymbol().equals("join");
 368
 369             LocalityBinding lb=new LocalityBinding(md, isatomic);
 370             if (isnative&&isatomic) {
 371                 System.out.println("Don't call native methods in atomic blocks!");
 372             }
 373             if (runmethodset==null||!runmethodset.contains(md)) {
 374                 //Skip this part if it is a run method
 375                 for(int i=0;i<fc.numArgs();i++) {
 376                     TempDescriptor arg=fc.getArg(i);
 377                     if(isnative&&(currtable.get(arg).equals(GLOBAL)||
 378                                   currtable.get(arg).equals(CONFLICT)))
 379                         throw new Error("Potential call to native method "+md+" with global parameter:\n"+currlb.getExplanation());
 380                     lb.setGlobal(i,currtable.get(arg));
 381                 }
 382             }
 383
 384             if (fc.getThis()!=null) {
 385                 Integer thistype=currtable.get(fc.getThis());
 386                 if (thistype==null)
 387                     thistype=EITHER;
 388
 389                 if(runmethodset!=null&&runmethodset.contains(md)&&thistype.equals(LOCAL))
 390                     throw new Error("Starting thread on local object not allowed in context:\n"+currlb.getExplanation());
 391                 if(isjoin&&thistype.equals(LOCAL))
 392                     throw new Error("Joining thread on local object not allowed in context:\n"+currlb.getExplanation());
 393                 if(thistype.equals(CONFLICT))
 394                     throw new Error("Using type that can be either local or global in context:\n"+currlb.getExplanation());
 395                 if(runmethodset==null&&thistype.equals(GLOBAL)&&!isatomic && !isjoin)
 396                     throw new Error("Using global object outside of transaction in context:\n"+currlb.getExplanation());
 397                 if (runmethodset==null&&isnative&&thistype.equals(GLOBAL) && !isjoin)
 398                     throw new Error("Potential call to native method "+md+" on global objects:\n"+currlb.getExplanation());
 399                 lb.setGlobalThis(thistype);
 400             }
 401             //lb is built
 402             if (!discovered.containsKey(lb)) {
 403                 if (isnative)
 404                     lb.setGlobalReturn(LOCAL);
 405                 else
 406                     lb.setGlobalReturn(EITHER);
 407                 lb.setParent(currlb);
 408                 lbtovisit.add(lb);
 409                 discovered.put(lb, lb);
 410                 if (!classtolb.containsKey(lb.getMethod().getClassDesc()))
 411                     classtolb.put(lb.getMethod().getClassDesc(), new HashSet<LocalityBinding>());
 412                 classtolb.get(lb.getMethod().getClassDesc()).add(lb);
 413                 if (!methodtolb.containsKey(lb.getMethod()))
 414                     methodtolb.put(lb.getMethod(), new HashSet<LocalityBinding>());
 415                 methodtolb.get(lb.getMethod()).add(lb);
 416             } else
 417                 lb=discovered.get(lb);
 418             Integer returnval=lb.getGlobalReturn();
 419             currreturnval=merge(returnval, currreturnval);
 420             if (!dependence.containsKey(lb))
 421                 dependence.put(lb, new HashSet<LocalityBinding>());
 422             dependence.get(lb).add(currlb);
 423         }
 424         if (fc.getReturnTemp()!=null) {
 425             currtable.put(fc.getReturnTemp(), currreturnval);
 426         }
 427     }
 428
 429     void processFieldNode(LocalityBinding lb, FlatFieldNode ffn, boolean transaction, Hashtable<TempDescriptor, Integer> currtable) {
 430         Integer type=currtable.get(ffn.getSrc());
 431         TempDescriptor dst=ffn.getDst();
 432         if (type.equals(LOCAL)) {
 433             if (ffn.getField().isGlobal())
 434                 currtable.put(dst,GLOBAL);
 435             else
 436                 currtable.put(dst,LOCAL);
 437         } else if (type.equals(GLOBAL)) {
 438             if (!transaction)
 439                 throw new Error("Global access outside of a transaction in context:\n"+lb.getExplanation());
 440             if (ffn.getField().getType().isPrimitive()&&!ffn.getField().getType().isArray())
 441                 currtable.put(dst, LOCAL); // primitives are local
 442             else
 443                 currtable.put(dst, GLOBAL);
 444         } else if (type.equals(EITHER)) {
 445             if (ffn.getField().getType().isPrimitive()&&!ffn.getField().getType().isArray())
 446                 currtable.put(dst, LOCAL); // primitives are local
 447             else if (ffn.getField().isGlobal())
 448                 currtable.put(dst, GLOBAL);
 449             else
 450                 currtable.put(dst, EITHER);
 451         } else if (type.equals(CONFLICT)) {
 452             throw new Error("Access to object that could be either global or local in context:\n"+lb.getExplanation());
 453         }
 454     }
 455
 456     //need to handle primitives
 457     void processSetFieldNode(LocalityBinding lb, FlatSetFieldNode fsfn, boolean transaction, Hashtable<TempDescriptor, Integer> currtable) {
 458         Integer srctype=currtable.get(fsfn.getSrc());
 459         Integer dsttype=currtable.get(fsfn.getDst());
 460
 461         if (dsttype.equals(LOCAL)) {
 462             if (fsfn.getField().isGlobal()) {
 463                 if (!(srctype.equals(GLOBAL)||srctype.equals(EITHER)))
 464                     throw new Error("Writing possible local reference to global field in context: \n"+lb.getExplanation());
 465             } else {
 466                 if (!(srctype.equals(LOCAL)||srctype.equals(EITHER)))
 467                     throw new Error("Writing possible global reference to local object in context: \n"+lb.getExplanation());
 468             }
 469         } else if (dsttype.equals(GLOBAL)) {
 470             if (!transaction)
 471                 throw new Error("Global access outside of a transaction in context:\n"+lb.getExplanation());
 472             //okay to store primitives in global object
 473             if (srctype.equals(LOCAL) && fsfn.getField().getType().isPrimitive() && ! fsfn.getField().getType().isArray())
 474                 return;
 475             if (!(srctype.equals(GLOBAL)||srctype.equals(EITHER)))
 476                 throw new Error("Writing possible local reference to global object in context:\n"+lb.getExplanation()+" for FlatFieldNode "+fsfn);
 477         } else if (dsttype.equals(EITHER)) {
 478             if (srctype.equals(CONFLICT))
 479                 throw new Error("Using reference that could be local or global in context:\n"+lb.getExplanation());
 480         } else if (dsttype.equals(CONFLICT)) {
 481             throw new Error("Access to object that could be either global or local in context:\n"+lb.getExplanation());
 482         }
 483     }
 484
 485     void processNew(LocalityBinding lb, FlatNew fn, boolean transaction, Hashtable<TempDescriptor, Integer> currtable) {
 486         if (fn.isGlobal()&&!transaction) {
 487             throw new Error("Allocating global object outside of transaction in context:"+lb.getExplanation());
 488         }
 489         if (fn.isGlobal())
 490             currtable.put(fn.getDst(), GLOBAL);
 491         else
 492             currtable.put(fn.getDst(), LOCAL);
 493     }
 494
 495     void processOpNode(FlatOpNode fon, Hashtable<TempDescriptor, Integer> currtable) {
 496         /* Just propagate value */
 497         Integer srcvalue=currtable.get(fon.getLeft());
 498         if (srcvalue==null) {
 499             throw new Error(fon.getLeft()+" is undefined!");
 500         }
 501         currtable.put(fon.getDest(), currtable.get(fon.getLeft()));
 502     }
 503
 504     void processCastNode(FlatCastNode fcn, Hashtable<TempDescriptor, Integer> currtable) {
 505         currtable.put(fcn.getDst(), currtable.get(fcn.getSrc()));
 506     }
 507
 508     void processLiteralNode(FlatLiteralNode fln, Hashtable<TempDescriptor, Integer> currtable) {
 509         //null is either
 510         if (fln.getValue()==null)
 511             currtable.put(fln.getDst(), EITHER);
 512         else
 513             currtable.put(fln.getDst(), LOCAL);
 514     }
 515
 516     void processReturnNode(LocalityBinding lb, FlatReturnNode frn, Hashtable<TempDescriptor, Integer> currtable) {
 517         if(frn.getReturnTemp()!=null) {
 518             Integer returntype=currtable.get(frn.getReturnTemp());
 519             lb.setGlobalReturn(merge(returntype, lb.getGlobalReturn()));
 520         }
 521     }
 522
 523     void processSetElementNode(LocalityBinding lb, FlatSetElementNode fsen, Hashtable<TempDescriptor, Integer> currtable, boolean isatomic) {
 524         Integer srctype=currtable.get(fsen.getSrc());
 525         Integer dsttype=currtable.get(fsen.getDst());
 526
 527         if (dsttype.equals(LOCAL)) {
 528             if (!(srctype.equals(LOCAL)||srctype.equals(EITHER)))
 529                 throw new Error("Writing possible global reference to local object in context:\n"+lb.getExplanation());
 530         } else if (dsttype.equals(GLOBAL)) {
 531             if (!(srctype.equals(GLOBAL)||srctype.equals(EITHER)))
 532                 throw new Error("Writing possible local reference to global object in context:\n"+lb.getExplanation());
 533             if (!isatomic)
 534                 throw new Error("Global access outside of a transaction in context:\n"+lb.getExplanation());
 535         } else if (dsttype.equals(EITHER)) {
 536             if (srctype.equals(CONFLICT))
 537                 throw new Error("Using reference that could be local or global in context:\n"+lb.getExplanation());
 538         } else if (dsttype.equals(CONFLICT)) {
 539             throw new Error("Access to object that could be either global or local in context:\n"+lb.getExplanation());
 540         }
 541     }
 542
 543     void processElementNode(LocalityBinding lb, FlatElementNode fen, Hashtable<TempDescriptor, Integer> currtable, boolean isatomic) {
 544         Integer type=currtable.get(fen.getSrc());
 545         TempDescriptor dst=fen.getDst();
 546         if (type.equals(LOCAL)) {
 547             currtable.put(dst,LOCAL);
 548         } else if (type.equals(GLOBAL)) {
 549             if (!isatomic)
 550                 throw new Error("Global access outside of a transaction in context:\n"+lb.getExplanation());
 551             currtable.put(dst, GLOBAL);
 552         } else if (type.equals(EITHER)) {
 553             currtable.put(dst, EITHER);
 554         } else if (type.equals(CONFLICT)) {
 555             throw new Error("Access to object that could be either global or local in context:\n"+lb.getExplanation());
 556         }
 557     }
 558
 559     void processAtomicEnterNode(FlatAtomicEnterNode fen, Hashtable<FlatNode, Integer> atomictable) {
 560         int atomic=atomictable.get(fen).intValue();
 561         atomictable.put(fen, new Integer(atomic+1));
 562     }
 563
 564     void processAtomicExitNode(FlatAtomicExitNode fen, Hashtable<FlatNode, Integer> atomictable) {
 565         int atomic=atomictable.get(fen).intValue();
 566         atomictable.put(fen, new Integer(atomic-1));
 567     }
 568
 569     private Hashtable<FlatNode, Set<TempDescriptor>> computeLiveTemps(FlatMethod fm) {
 570         Hashtable<FlatNode, Set<TempDescriptor>> nodetotemps=new Hashtable<FlatNode, Set<TempDescriptor>>();
 571
 572         Set<FlatNode> toprocess=fm.getNodeSet();
 573
 574         while(!toprocess.isEmpty()) {
 575             FlatNode fn=toprocess.iterator().next();
 576             toprocess.remove(fn);
 577
 578             List<TempDescriptor> reads=Arrays.asList(fn.readsTemps());
 579             List<TempDescriptor> writes=Arrays.asList(fn.writesTemps());
 580
 581             HashSet<TempDescriptor> tempset=new HashSet<TempDescriptor>();
 582             for(int i=0;i<fn.numNext();i++) {
 583                 FlatNode fnnext=fn.getNext(i);
 584                 if (nodetotemps.containsKey(fnnext))
 585                     tempset.addAll(nodetotemps.get(fnnext));
 586             }
 587             tempset.removeAll(writes);
 588             tempset.addAll(reads);
 589             if (!nodetotemps.containsKey(fn)||
 590                 !nodetotemps.get(fn).equals(tempset)) {
 591                 nodetotemps.put(fn, tempset);
 592                 for(int i=0;i<fn.numPrev();i++)
 593                     toprocess.add(fn.getPrev(i));
 594             }
 595         }
 596         return nodetotemps;
 597     }
 598
 599     private void computeTempstoSave() {
 600         for(Iterator<LocalityBinding> lbit=getLocalityBindings().iterator();lbit.hasNext();) {
 601             LocalityBinding lb=lbit.next();
 602             computeTempstoSave(lb);
 603         }
 604     }
 605
 606     /* Need to checkpoint all temps that could be read from along any
 607      * path that are either:
 608        1) Written to by any assignment inside the transaction
 609        2) Read from a global temp.
 610
 611        Generate tempstosave map from
 612        localitybinding->flatatomicenternode->Set<TempDescriptors>
 613     */
 614
 615     private void computeTempstoSave(LocalityBinding lb) {
 616         if (lb.isAtomic())
 617             return;
 618         Hashtable<FlatNode, Integer> atomictab=getAtomic(lb);
 619         Hashtable<FlatNode, Hashtable<TempDescriptor, Integer>> temptab=getNodeTempInfo(lb);
 620         MethodDescriptor md=lb.getMethod();
 621         FlatMethod fm=state.getMethodFlat(md);
 622         Hashtable<FlatNode, Set<TempDescriptor>> nodetotemps=computeLiveTemps(fm);
 623         Hashtable<FlatAtomicEnterNode, Set<TempDescriptor>> nodetosavetemps=new Hashtable<FlatAtomicEnterNode, Set<TempDescriptor>>();
 624         tempstosave.put(lb, nodetosavetemps);
 625         Hashtable<FlatNode, FlatAtomicEnterNode> nodemap=new Hashtable<FlatNode, FlatAtomicEnterNode>();
 626         HashSet<FlatNode> toprocess=new HashSet<FlatNode>();
 627         HashSet<FlatNode> discovered=new HashSet<FlatNode>();
 628         toprocess.add(fm);
 629         discovered.add(fm);
 630         while(!toprocess.isEmpty()) {
 631             FlatNode fn=toprocess.iterator().next();
 632             toprocess.remove(fn);
 633             boolean isatomic=atomictab.get(fn).intValue()>0;
 634             if (isatomic&&
 635                 atomictab.get(fn.getPrev(0)).intValue()==0) {
 636                 assert(fn.getPrev(0).kind()==FKind.FlatAtomicEnterNode);
 637                 nodemap.put(fn, (FlatAtomicEnterNode)fn);
 638                 nodetosavetemps.put((FlatAtomicEnterNode)fn, new HashSet<TempDescriptor>());
 639             } else if (isatomic) {
 640                 FlatAtomicEnterNode atomicnode=nodemap.get(fn);
 641                 Set<TempDescriptor> livetemps=nodetotemps.get(fn);
 642                 List<TempDescriptor> reads=Arrays.asList(fn.readsTemps());
 643                 List<TempDescriptor> writes=Arrays.asList(fn.readsTemps());
 644
 645                 for(Iterator<TempDescriptor> tempit=livetemps.iterator();tempit.hasNext();) {
 646                     TempDescriptor tmp=tempit.next();
 647                     if (writes.contains(tmp)) {
 648                         nodetosavetemps.get(atomicnode).add(tmp);
 649                     } else if (reads.contains(tmp)&&temptab.get(fn).get(tmp)==GLOBAL) {
 650                         nodetosavetemps.get(atomicnode).add(tmp);
 651                     }
 652                 }
 653             }
 654             for(int i=0;i<fn.numNext();i++) {
 655                 FlatNode fnnext=fn.getNext(i);
 656                 if (!discovered.contains(fnnext)) {
 657                     discovered.add(fnnext);
 658                     toprocess.add(fnnext);
 659                     if(isatomic) {
 660                         nodemap.put(fnnext, nodemap.get(fn));
 661                     }
 662                 }
 663             }
 664         }
 665     }
 666 }