gerrit.simantics Code Review - simantics/platform.git/blob

   1 package org.simantics.scl.compiler.internal.codegen.chr;
   2
   3 import java.util.ArrayList;
   4
   5 import org.cojen.classfile.TypeDesc;
   6 import org.objectweb.asm.Label;
   7 import org.objectweb.asm.Opcodes;
   8 import org.simantics.scl.compiler.elaboration.chr.CHRRuleset;
   9 import org.simantics.scl.compiler.elaboration.chr.plan.PrioritizedPlan;
  10 import org.simantics.scl.compiler.elaboration.chr.relations.CHRConstraint;
  11 import org.simantics.scl.compiler.elaboration.chr.relations.CHRConstraint.IndexInfo;
  12 import org.simantics.scl.compiler.internal.codegen.references.BoundVar;
  13 import org.simantics.scl.compiler.internal.codegen.types.JavaTypeTranslator;
  14 import org.simantics.scl.compiler.internal.codegen.utils.ClassBuilder;
  15 import org.simantics.scl.compiler.internal.codegen.utils.CodeBuilderUtils;
  16 import org.simantics.scl.compiler.internal.codegen.utils.Constants;
  17 import org.simantics.scl.compiler.internal.codegen.utils.LocalVariable;
  18 import org.simantics.scl.compiler.internal.codegen.utils.MethodBuilder;
  19 import org.simantics.scl.compiler.internal.codegen.utils.MethodBuilderBase;
  20 import org.simantics.scl.compiler.internal.codegen.utils.ModuleBuilder;
  21
  22 import gnu.trove.list.array.TIntArrayList;
  23 import gnu.trove.set.hash.THashSet;
  24
  25 public class CHRCodeGenerator {
  26
  27     public static final TypeDesc FACT_ID_TYPE = TypeDesc.INT;
  28     public static final String CHRHashIndex_name = "org/simantics/scl/runtime/chr/CHRHashIndex";
  29     public static final TypeDesc CHRHashIndex = TypeDesc.forClass(CHRHashIndex_name);
  30     public static final String FactActivationQueue_name = "org/simantics/scl/runtime/chr/FactActivationQueue";
  31     public static final TypeDesc FactActivationQueue = TypeDesc.forClass(FactActivationQueue_name);
  32     public static final String Fact_name = "org/simantics/scl/runtime/chr/Fact";
  33     public static final TypeDesc Fact = TypeDesc.forClass(Fact_name);
  34     public static final String QUEUE = "queue";
  35
  36     private static class StoreInitialization {
  37         final int access;
  38         final String fieldName;
  39         final TypeDesc fieldType;
  40         final String className;
  41         public StoreInitialization(int access, String fieldName, TypeDesc fieldType, String className) {
  42             this.access = access;
  43             this.fieldName = fieldName;
  44             this.fieldType = fieldType;
  45             this.className = className;
  46         }
  47     }
  48
  49     public static void generateStore(ModuleBuilder moduleBuilder, CHRRuleset ruleset) {
  50         ClassBuilder storeClassBuilder = new ClassBuilder(moduleBuilder, Opcodes.ACC_PUBLIC, ruleset.storeClassName, "java/lang/Object");
  51         if(ruleset.parameters == null)
  52             ruleset.parameters = new BoundVar[0];
  53         ruleset.parameterTypeDescs = moduleBuilder.getJavaTypeTranslator().getTypeDescs(ruleset.parameters);
  54
  55         ArrayList<StoreInitialization> hashIndexInitializations = new ArrayList<>();
  56         for(CHRConstraint constraint : ruleset.constraints)
  57             generateFact(storeClassBuilder, constraint, hashIndexInitializations);
  58
  59         // Fields
  60         for(int i=0;i<ruleset.parameterTypeDescs.length;++i)
  61             storeClassBuilder.addField(Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL, "p" + i, ruleset.parameterTypeDescs[i]);
  62         storeClassBuilder.addField(Opcodes.ACC_PUBLIC, "currentId", FACT_ID_TYPE);
  63         for(StoreInitialization ini : hashIndexInitializations)
  64             storeClassBuilder.addField(ini.access, ini.fieldName, ini.fieldType);
  65         storeClassBuilder.addField(Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL, QUEUE, FactActivationQueue);
  66
  67         // Constructors
  68
  69         {
  70             MethodBuilderBase mb = storeClassBuilder.addConstructor(Opcodes.ACC_PUBLIC, ruleset.parameterTypeDescs);
  71             mb.loadThis();
  72             mb.invokeConstructor(storeClassBuilder.getSuperClassName(), Constants.EMPTY_TYPEDESC_ARRAY);
  73             for(int i=0;i<ruleset.parameterTypeDescs.length;++i) {
  74                 mb.loadThis();
  75                 mb.loadLocal(mb.getParameter(i));
  76                 mb.storeField(ruleset.storeClassName, "p" + i, ruleset.parameterTypeDescs[i]);
  77             }
  78             mb.loadThis();
  79             mb.loadConstant(1);
  80             mb.storeField(storeClassBuilder.getClassName(), "currentId", TypeDesc.INT);
  81             for(StoreInitialization ini : hashIndexInitializations) {
  82                 mb.loadThis();
  83                 mb.newObject(ini.className);
  84                 mb.dup();
  85                 mb.invokeConstructor(ini.className, Constants.EMPTY_TYPEDESC_ARRAY);
  86                 mb.storeField(ruleset.storeClassName, ini.fieldName, ini.fieldType);
  87             }
  88             {
  89                 mb.loadThis();
  90                 mb.newObject(FactActivationQueue_name);
  91                 mb.dup();
  92                 mb.loadConstant(ruleset.priorityCount);
  93                 mb.invokeConstructor(FactActivationQueue_name, new TypeDesc[] {TypeDesc.INT});
  94                 mb.storeField(ruleset.storeClassName, QUEUE, FactActivationQueue);
  95             }
  96             mb.returnVoid();
  97             mb.finish();
  98         }
  99
 100         // Activate
 101
 102         {
 103             MethodBuilderBase mb = storeClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, "activate", TypeDesc.VOID, new TypeDesc[] {TypeDesc.INT});
 104             mb.loadThis();
 105             mb.loadField(ruleset.storeClassName, QUEUE, FactActivationQueue);
 106             mb.loadThis();
 107             mb.loadLocal(mb.getParameter(0));
 108             mb.invokeVirtual(FactActivationQueue_name, "activate", TypeDesc.VOID, new TypeDesc[] {TypeDesc.OBJECT, TypeDesc.INT});
 109             mb.returnVoid();
 110             mb.finish();
 111         }
 112
 113         moduleBuilder.addClass(storeClassBuilder);
 114     }
 115
 116     private static void generateFact(ClassBuilder storeClassBuilder, CHRConstraint constraint, ArrayList<StoreInitialization> hashIndexInitializations) {
 117         CHRRuleset ruleset = constraint.parentRuleset;
 118         boolean supportsRemoval = constraint.mayBeRemoved();
 119
 120         ModuleBuilder moduleBuilder = storeClassBuilder.getModuleBuilder();
 121         JavaTypeTranslator jtt = moduleBuilder.getJavaTypeTranslator();
 122         TypeDesc storeTypeDesc = storeClassBuilder.getType();
 123         TypeDesc[] storeTypeDescArray = new TypeDesc[] { storeTypeDesc };
 124
 125         String factClassName = storeClassBuilder.getClassName() + "$" + constraint.name;
 126         TypeDesc factTypeDesc = TypeDesc.forClass(factClassName);
 127         ClassBuilder factClassBuilder = new ClassBuilder(moduleBuilder, Opcodes.ACC_PUBLIC, factClassName, "java/lang/Object", Fact_name);
 128
 129         // Fields
 130
 131         /* public int id;
 132            public int c0; // key
 133            public int c1;
 134            public ExampleFact bfPrev;
 135            public ExampleFact bfNext;
 136          */
 137         TypeDesc[] parameterTypeDescs = jtt.toTypeDescs(constraint.parameterTypes);
 138         factClassBuilder.addField(Opcodes.ACC_PUBLIC, "id", FACT_ID_TYPE);
 139         for(int i=0;i<constraint.parameterTypes.length;++i)
 140             factClassBuilder.addField(Opcodes.ACC_PUBLIC, "c" + i, parameterTypeDescs[i]);
 141
 142         for(IndexInfo indexInfo : constraint.getIndices()) {
 143             if(supportsRemoval)
 144                 factClassBuilder.addField(Opcodes.ACC_PUBLIC, indexInfo.indexName + "Prev", factTypeDesc);
 145             factClassBuilder.addField(Opcodes.ACC_PUBLIC, indexInfo.indexName + "Next", factTypeDesc);
 146
 147             String hashIndexField = constraint.name + "$" + indexInfo.indexName;
 148             if(indexInfo.indexMask == 0) {
 149                 // If there are now bound parameters, use just a direct reference to a fact
 150                 storeClassBuilder.addField(Opcodes.ACC_PUBLIC, hashIndexField, factTypeDesc);
 151             }
 152             else {
 153                 ClassBuilder hashClass = generateSpecializedHashIndex(storeClassBuilder, constraint, indexInfo, factTypeDesc, factClassName);
 154                 moduleBuilder.addClass(hashClass);
 155                 hashIndexInitializations.add(new StoreInitialization(Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL, hashIndexField, CHRHashIndex, hashClass.getClassName()));
 156             }
 157         }
 158
 159         // Method: get
 160
 161         hashIndexInitializations.add(new StoreInitialization(Opcodes.ACC_PRIVATE | Opcodes.ACC_FINAL, constraint.name + "$temp", factTypeDesc, factClassName));
 162
 163
 164         {
 165             /*
 166             public ExampleFact ExampleFact$bf(int c0) {
 167                 ExampleFact$temp.c0 = c0;
 168                 return (ExampleFact)ExampleFact_bfIndex.getEqual(ExampleFact$temp);
 169             }
 170             */
 171             for(IndexInfo indexInfo : constraint.getIndices()) {
 172                 /*if(indexInfo.indexMask == 0) {
 173                     MethodBuilderBase mb = storeClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, constraint.name + "$" + indexInfo.indexName,
 174                             factTypeDesc, Constants.EMPTY_TYPEDESC_ARRAY);
 175                     mb.loadThis();
 176                     mb.loadField(storeClassBuilder.getClassName(), constraint.name + "$" + indexInfo.indexName, factTypeDesc);
 177                     mb.returnValue(factTypeDesc);
 178                     mb.finish();
 179                 }*/
 180                 if(indexInfo.indexMask != 0) {
 181                     ArrayList<TypeDesc> getParameterTypeDescs = new ArrayList<TypeDesc>(constraint.parameterTypes.length);
 182                     for(int i=0;i<constraint.parameterTypes.length;++i)
 183                         if(((indexInfo.indexMask>>i)&1)==1)
 184                             getParameterTypeDescs.add(parameterTypeDescs[i]);
 185                     MethodBuilderBase mb = storeClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, constraint.name + "$" + indexInfo.indexName, factTypeDesc,
 186                             getParameterTypeDescs.toArray(new TypeDesc[getParameterTypeDescs.size()]));
 187                     mb.loadThis();
 188                     mb.loadField(storeClassBuilder.getClassName(), constraint.name + "$temp", factTypeDesc);
 189                     LocalVariable tempFactVar = mb.createLocalVariable("temp", factTypeDesc);
 190                     mb.storeLocal(tempFactVar);
 191                     int parameterId=0;
 192                     for(int i=0;i<constraint.parameterTypes.length;++i)
 193                         if(((indexInfo.indexMask>>i)&1)==1) {
 194                             mb.loadLocal(tempFactVar);
 195                             mb.loadLocal(mb.getParameter(parameterId++));
 196                             mb.storeField(factClassName, "c"+i, parameterTypeDescs[i]);
 197                         }
 198
 199                     mb.loadThis();
 200                     mb.loadField(storeClassBuilder.getClassName(), constraint.name + "$" + indexInfo.indexName, CHRHashIndex);
 201                     mb.loadLocal(tempFactVar);
 202                     mb.invokeVirtual(CHRHashIndex_name, supportsRemoval ? "getEqual" : "getEqualNoRemovals", TypeDesc.OBJECT, Constants.OBJECTS[1]);
 203                     mb.checkCast(factTypeDesc);
 204
 205                     mb.returnValue(factTypeDesc);
 206                     mb.finish();
 207                 }
 208             }
 209         }
 210
 211         // Method: add
 212
 213         {
 214             MethodBuilderBase mb = factClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, "add", TypeDesc.VOID, storeTypeDescArray);
 215             LocalVariable storeParameter = mb.getParameter(0);
 216             for(IndexInfo indexInfo : constraint.getIndices()) {
 217                 String linkedListPrev = indexInfo.indexName + "Prev";
 218                 String linkedListNext = indexInfo.indexName + "Next";
 219                 String storeHashIndexName = constraint.name + "$" + indexInfo.indexName;
 220
 221                 // public void add(ExampleStore store) {
 222                 //     bfNext = (ExampleFact)store.ExampleFact_bfIndex.addFreshAndReturnOld(this);
 223                 //     if(bfNext != null)
 224                 //         bfNext.bfPrev = this;
 225                 // }
 226
 227                 if(indexInfo.indexMask == 0) {
 228                     mb.loadThis();
 229                     mb.loadLocal(storeParameter);
 230                     mb.loadField(storeClassBuilder.getClassName(), storeHashIndexName, factTypeDesc);
 231                     if(supportsRemoval)
 232                         mb.dupX1();
 233                     mb.storeField(factClassName, linkedListNext, factTypeDesc);
 234                     if(supportsRemoval) {
 235                         Label cont = new Label();
 236                         mb.ifNullBranch(cont, true);
 237                         mb.loadThis();
 238                         mb.loadField(factClassName, linkedListNext, factTypeDesc);
 239                         mb.loadThis();
 240                         mb.storeField(factClassName, linkedListPrev, factTypeDesc);
 241                         mb.setLocation(cont);
 242                     }
 243                     mb.loadLocal(storeParameter);
 244                     mb.loadThis();
 245                     mb.storeField(storeClassBuilder.getClassName(), storeHashIndexName, factTypeDesc);
 246                 }
 247                 else {
 248                     // bfNext = (ExampleFact)store.ExampleFact_bfIndex.addFreshAndReturnOld(this);
 249                     mb.loadThis();
 250                     mb.loadLocal(storeParameter);
 251                     mb.loadField(storeClassBuilder.getClassName(), storeHashIndexName, CHRHashIndex);
 252                     mb.loadThis();
 253                     mb.invokeVirtual(CHRHashIndex_name, supportsRemoval ? "addFreshAndReturnOld" : "addFreshAndReturnOld", TypeDesc.OBJECT, Constants.OBJECTS[1]);
 254                     mb.checkCast(factTypeDesc);
 255                     if(supportsRemoval)
 256                         mb.dupX1();
 257                     mb.storeField(factClassName, linkedListNext, factTypeDesc);
 258                     // leaves bfNext on the stack
 259
 260                     //if(bfNext != null)
 261                     //    bfNext.bfPrev = this;
 262                     if(supportsRemoval) {
 263                         Label cont = new Label();
 264                         mb.ifNullBranch(cont, true);
 265                         mb.loadThis();
 266                         mb.loadField(factClassName, linkedListNext, factTypeDesc);
 267                         mb.loadThis();
 268                         mb.storeField(factClassName, linkedListPrev, factTypeDesc);
 269                         mb.setLocation(cont);
 270                     }
 271                 }
 272             }
 273             if(!constraint.isPassive()) {
 274                 mb.loadLocal(storeParameter);
 275                 mb.loadField(storeClassBuilder.getClassName(), QUEUE, FactActivationQueue);
 276                 mb.loadConstant(constraint.getMinimumPriority());
 277                 mb.loadThis();
 278                 mb.invokeVirtual(FactActivationQueue_name, "add", TypeDesc.VOID, new TypeDesc[] {TypeDesc.INT, Fact});
 279             }
 280             mb.returnVoid();
 281             mb.finish();
 282         }
 283
 284         // Method: remove
 285
 286         if(supportsRemoval) {
 287             // public void remove(ExampleStore store) {
 288             //     if(bfPrev == null) {
 289             //         if(bfNext == null)
 290             //             store.ExampleFact_bfIndex.removeKnownToExistKey(this);
 291             //         else {
 292             //             bfNext.bfPrev = null;
 293             //             store.ExampleFact_bfIndex.replaceKnownToExistKey(this, bfNext);
 294             //         }
 295             //     }
 296             //     else {
 297             //         bfPrev.bfNext = bfNext;
 298             //         if(bfNext != null)
 299             //             bfNext.bfPrev = bfPrev;
 300             //     }
 301             // }
 302
 303             MethodBuilderBase mb = factClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, "remove", TypeDesc.VOID, storeTypeDescArray);
 304             LocalVariable storeParameter = mb.getParameter(0);
 305             for(IndexInfo indexInfo : constraint.getIndices()) {
 306                 String linkedListPrev = indexInfo.indexName + "Prev";
 307                 String linkedListNext = indexInfo.indexName + "Next";
 308                 String storeHashIndexName = constraint.name + "$" + indexInfo.indexName;
 309
 310                 Label nextIndex = mb.createLabel();
 311
 312                 // if(bfPrev == null) {
 313                 mb.loadThis();
 314                 mb.loadField(factClassName, linkedListPrev, factTypeDesc);
 315                 Label else1 = new Label();
 316                 mb.ifNullBranch(else1, false);
 317
 318                 //     if(bfNext == null)
 319                 mb.loadThis();
 320                 mb.loadField(factClassName, linkedListNext, factTypeDesc);
 321                 Label else2 = new Label();
 322                 mb.ifNullBranch(else2, false);
 323
 324                 //         store.ExampleFact_bfIndex.removeKnownToExistKey(this);
 325                 if(indexInfo.indexMask == 0) {
 326                     mb.loadLocal(storeParameter);
 327                     mb.loadNull();
 328                     mb.storeField(storeClassBuilder.getClassName(), storeHashIndexName, factTypeDesc);
 329                 }
 330                 else {
 331                     mb.loadLocal(storeParameter);
 332                     mb.loadField(storeClassBuilder.getClassName(), storeHashIndexName, CHRHashIndex);
 333                     mb.loadThis();
 334                     mb.invokeVirtual(CHRHashIndex_name, "removeKnownToExistKey", TypeDesc.VOID, Constants.OBJECTS[1]);
 335                 }
 336                 mb.branch(nextIndex);
 337
 338                 //     else {
 339                 mb.setLocation(else2);
 340                 //         bfNext.bfPrev = null;
 341                 mb.loadThis();
 342                 mb.loadField(factClassName, linkedListNext, factTypeDesc);
 343                 mb.loadNull();
 344                 mb.storeField(factClassName, linkedListPrev, factTypeDesc);
 345                 //         store.ExampleFact_bfIndex.replaceKnownToExistKey(this, bfNext);
 346                 if(indexInfo.indexMask == 0) {
 347                     mb.loadLocal(storeParameter);
 348                     mb.loadThis();
 349                     mb.loadField(factClassName, linkedListNext, factTypeDesc);
 350                     mb.storeField(storeClassBuilder.getClassName(), storeHashIndexName, factTypeDesc);
 351                 }
 352                 else {
 353                     mb.loadLocal(storeParameter);
 354                     mb.loadField(storeClassBuilder.getClassName(), storeHashIndexName, CHRHashIndex);
 355                     mb.loadThis();
 356                     mb.loadThis();
 357                     mb.loadField(factClassName, linkedListNext, factTypeDesc);
 358                     mb.invokeVirtual(CHRHashIndex_name, "replaceKnownToExistKey", TypeDesc.VOID, Constants.OBJECTS[2]);
 359                 }
 360                 mb.branch(nextIndex);
 361                 //     }
 362
 363                 // else {
 364                 mb.setLocation(else1);
 365                 //     bfPrev.bfNext = bfNext;
 366                 mb.loadThis();
 367                 mb.loadField(factClassName, linkedListPrev, factTypeDesc);
 368                 mb.loadThis();
 369                 mb.loadField(factClassName, linkedListNext, factTypeDesc);
 370                 mb.storeField(factClassName, linkedListNext, factTypeDesc);
 371                 //     if(bfNext != null)
 372                 mb.loadThis();
 373                 mb.loadField(factClassName, linkedListNext, factTypeDesc);
 374                 Label else3 = new Label();
 375                 mb.ifNullBranch(else3, true);
 376                 //         bfNext.bfPrev = bfPrev;
 377                 mb.loadThis();
 378                 mb.loadField(factClassName, linkedListNext, factTypeDesc);
 379                 mb.loadThis();
 380                 mb.loadField(factClassName, linkedListPrev, factTypeDesc);
 381                 mb.storeField(factClassName, linkedListPrev, factTypeDesc);
 382                 mb.setLocation(else3);
 383                 mb.branch(nextIndex);
 384                 // }
 385
 386                 mb.setLocation(nextIndex);
 387             }
 388             mb.loadThis();
 389             mb.loadConstant(-1);
 390             mb.storeField(factClassName, "id", FACT_ID_TYPE);
 391             mb.returnVoid();
 392             mb.finish();
 393         }
 394
 395         // Method: isAlive
 396
 397         {
 398             // @Override
 399             // public boolean isAlive() {
 400             //     return id >= 0;
 401             // }
 402
 403             MethodBuilderBase mb = factClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, "isAlive", TypeDesc.BOOLEAN, Constants.EMPTY_TYPEDESC_ARRAY);
 404             if(supportsRemoval) {
 405                 mb.loadThis();
 406                 mb.loadField(factClassName, "id", FACT_ID_TYPE);
 407
 408                 Label thenBranch = mb.createLabel();
 409                 mb.ifZeroComparisonBranch(thenBranch, "<");
 410                 mb.loadConstant(true);
 411                 mb.returnValue(TypeDesc.BOOLEAN);
 412
 413                 mb.setLocation(thenBranch);
 414                 mb.loadConstant(false);
 415                 mb.returnValue(TypeDesc.BOOLEAN);
 416             }
 417             else {
 418                 mb.loadConstant(true);
 419                 mb.returnValue(TypeDesc.BOOLEAN);
 420             }
 421             mb.finish();
 422         }
 423
 424         // activate parts
 425
 426         THashSet<BoundVar> usedParameters = new THashSet<BoundVar>();
 427         for(int i=0;i<constraint.plans.size();++i) {
 428             PrioritizedPlan plan = constraint.plans.get(i);
 429             MethodBuilder mb = factClassBuilder.addMethod(Opcodes.ACC_PUBLIC, "activate" + i, TypeDesc.BOOLEAN, new TypeDesc[] {storeTypeDesc});
 430             LocalVariable storeVar = mb.getParameter(0);
 431             LocalVariable factVar = new LocalVariable(0, factTypeDesc);
 432             mb.setLocalVariable(ruleset.this_, storeVar);
 433             mb.setLocalVariable(plan.implementation.getParameters()[0], factVar);
 434
 435             // Set closure parameters
 436             usedParameters.clear();
 437             plan.implementation.forValRefs(valRef -> {
 438                 if(valRef.getBinding() instanceof BoundVar)
 439                     usedParameters.add((BoundVar)valRef.getBinding());
 440             });
 441             for(int j=0;j<ruleset.parameters.length;++j) {
 442                 BoundVar parameter = ruleset.parameters[j];
 443                 if(!usedParameters.contains(parameter))
 444                     continue;
 445                 mb.loadLocal(storeVar);
 446                 mb.loadField(storeClassBuilder.getClassName(), "p"+j, ruleset.parameterTypeDescs[j]);
 447                 mb.store(parameter);
 448             }
 449
 450             // Generate code
 451             //System.out.println("=== activate" + i + " ==========================================================");
 452             //System.out.println(plan.implementation);
 453             plan.implementation.markGenerateOnFly();
 454             plan.implementation.generateCodeWithAlreadyPreparedParameters(mb);
 455             mb.finish();
 456         }
 457
 458         // Method: activate
 459
 460         {
 461             // @Override
 462             // public int activate(Object context, int priority) {
 463             //     return -1;
 464             // }
 465
 466             MethodBuilderBase mb = factClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, "activate", TypeDesc.INT, new TypeDesc[] {TypeDesc.OBJECT, TypeDesc.INT});
 467             Label defaultLabel = mb.createLabel();
 468
 469             if(!constraint.isPassive()) {
 470                 // Check if the fact is alive
 471                 mb.loadThis();
 472                 mb.loadField(factClassName, "id", TypeDesc.INT);
 473                 mb.ifZeroComparisonBranch(defaultLabel, "<");
 474
 475                 mb.loadLocal(mb.getParameter(0));
 476                 mb.checkCast(storeTypeDesc);
 477                 LocalVariable storeVariable = new LocalVariable(1, storeTypeDesc);
 478                 mb.storeLocal(storeVariable);
 479
 480                 TIntArrayList priorities = new TIntArrayList(constraint.plans.size());
 481                 ArrayList<Label> labels = new ArrayList<Label>();
 482                 int lastPriority = -1;
 483                 for(PrioritizedPlan plan : constraint.plans)
 484                     if(plan.priority != lastPriority) {
 485                         priorities.add(plan.priority);
 486                         labels.add(mb.createLabel());
 487                         lastPriority = plan.priority;
 488                     }
 489
 490                 mb.loadLocal(mb.getParameter(1));
 491                 mb.switch_(priorities.toArray(), labels.toArray(new Label[labels.size()]), defaultLabel);
 492                 int labelId = -1;
 493                 for(int i=0;i<constraint.plans.size();++i) {
 494                     PrioritizedPlan plan = constraint.plans.get(i);
 495                     if(labelId == -1 || plan.priority != priorities.get(labelId)) {
 496                         if(labelId >= 0) {
 497                             mb.loadConstant(plan.priority);
 498                             mb.returnValue(TypeDesc.INT);
 499                         }
 500                         ++labelId;
 501                         mb.setLocation(labels.get(labelId));
 502                     }
 503                     mb.loadThis();
 504                     mb.loadLocal(storeVariable);
 505                     mb.invokeVirtual(factClassName, "activate" + i, TypeDesc.BOOLEAN, new TypeDesc[] {storeTypeDesc});
 506                     mb.ifZeroComparisonBranch(defaultLabel, "==");
 507                 }
 508                 mb.setLocation(defaultLabel);
 509             }
 510             mb.loadConstant(-1);
 511             mb.returnValue(TypeDesc.INT);
 512             mb.finish();
 513         }
 514
 515         // Constructors
 516
 517         {
 518             // public ExampleFact(int id, int c0, int c1) {
 519             //     this.id = id;
 520             //     this.c0 = c0;
 521             //     this.c1 = c1;
 522             // }
 523
 524             TypeDesc[] constructorParameters = new TypeDesc[parameterTypeDescs.length+1];
 525             constructorParameters[0] = FACT_ID_TYPE;
 526             for(int i=0;i<parameterTypeDescs.length;++i)
 527                 constructorParameters[i+1] = parameterTypeDescs[i];
 528             MethodBuilderBase mb = factClassBuilder.addConstructor(Opcodes.ACC_PUBLIC, constructorParameters);
 529             mb.loadThis();
 530             mb.invokeConstructor(factClassBuilder.getSuperClassName(), Constants.EMPTY_TYPEDESC_ARRAY);
 531             mb.loadThis();
 532             mb.loadLocal(mb.getParameter(0));
 533             mb.storeField(factClassName, "id", FACT_ID_TYPE);
 534             for(int i=0;i<constraint.parameterTypes.length;++i) {
 535                 mb.loadThis();
 536                 mb.loadLocal(mb.getParameter(i+1));
 537                 mb.storeField(factClassName, "c" + i, parameterTypeDescs[i]);
 538             }
 539             mb.returnVoid();
 540             mb.finish();
 541         }
 542         factClassBuilder.addDefaultConstructor();
 543
 544         moduleBuilder.addClass(factClassBuilder);
 545     }
 546
 547     private static ClassBuilder generateSpecializedHashIndex(ClassBuilder storeClassBuilder, CHRConstraint constraint, IndexInfo indexInfo, TypeDesc factClassTypeDesc, String factClassName) {
 548         // new CHRHashIndex() {
 549         //     @Override
 550         //     protected boolean keyEquals(Object a, Object b) {
 551         //         return ((ExampleFact)a).c0 == ((ExampleFact)b).c0;
 552         //     }
 553         //     @Override
 554         //     protected int keyHashCode(Object key) {
 555         //         return ((ExampleFact)key).c0;
 556         //     }
 557         // }
 558
 559         ModuleBuilder moduleBuilder = storeClassBuilder.getModuleBuilder();
 560         JavaTypeTranslator jtt = moduleBuilder.getJavaTypeTranslator();
 561
 562         String hashIndexClassName = factClassName + "$" + indexInfo.indexName;
 563         ClassBuilder hashIndexClassBuilder = new ClassBuilder(moduleBuilder, Opcodes.ACC_PUBLIC, hashIndexClassName, "org/simantics/scl/runtime/chr/CHRHashIndex");
 564
 565         // Method: keyEquals
 566
 567         {
 568
 569             // @Override
 570             // protected boolean keyEquals(Object a, Object b) {
 571             //     return ((ExampleFact)a).c0 == ((ExampleFact)b).c0;
 572             // }
 573
 574             MethodBuilderBase mb = hashIndexClassBuilder.addMethodBase(Opcodes.ACC_PROTECTED, "keyEquals", TypeDesc.BOOLEAN, Constants.OBJECTS[2]);
 575             mb.loadLocal(mb.getParameter(0));
 576             mb.checkCast(factClassTypeDesc);
 577             LocalVariable aVar = mb.createLocalVariable("a", factClassTypeDesc);
 578             mb.storeLocal(aVar);
 579
 580             mb.loadLocal(mb.getParameter(1));
 581             mb.checkCast(factClassTypeDesc);
 582             LocalVariable bVar = mb.createLocalVariable("b", factClassTypeDesc);
 583             mb.storeLocal(bVar);
 584
 585             Label failure = mb.createLabel();
 586
 587             int curMask = indexInfo.indexMask;
 588             for(int i=0;i<constraint.parameterTypes.length;++i,curMask>>=1)
 589                 if((curMask&1) == 1) {
 590                     TypeDesc fieldTypeDesc = jtt.toTypeDesc(constraint.parameterTypes[i]);
 591                     if(fieldTypeDesc.equals(TypeDesc.VOID))
 592                         continue;
 593                     mb.loadLocal(aVar);
 594                     mb.loadField(factClassName, "c"+i, fieldTypeDesc);
 595
 596                     mb.loadLocal(bVar);
 597                     mb.loadField(factClassName, "c"+i, fieldTypeDesc);
 598
 599                     CodeBuilderUtils.equals(mb, fieldTypeDesc, failure);
 600                 }
 601             mb.loadConstant(true);
 602             mb.returnValue(TypeDesc.BOOLEAN);
 603
 604             mb.setLocation(failure);
 605             mb.loadConstant(false);
 606             mb.returnValue(TypeDesc.BOOLEAN);
 607             mb.finish();
 608         }
 609
 610         // Method: keyHashCode
 611
 612         {
 613             // @Override
 614             // protected int keyHashCode(Object key) {
 615             //     return (0x811C9DC5^((ExampleFact)key).c0)*16777619;
 616             // }
 617
 618             MethodBuilderBase mb = hashIndexClassBuilder.addMethodBase(Opcodes.ACC_PROTECTED, "keyHashCode", TypeDesc.INT, Constants.OBJECTS[1]);
 619             mb.loadLocal(mb.getParameter(0));
 620             mb.checkCast(factClassTypeDesc);
 621             LocalVariable factVar = mb.createLocalVariable("fact", factClassTypeDesc);
 622             mb.storeLocal(factVar);
 623
 624             mb.loadConstant(0x811C9DC5);
 625
 626             int curMask = indexInfo.indexMask;
 627             for(int i=0;i<constraint.parameterTypes.length;++i,curMask>>=1)
 628                 if((curMask&1) == 1) {
 629                     TypeDesc fieldTypeDesc = jtt.toTypeDesc(constraint.parameterTypes[i]);
 630                     if(fieldTypeDesc.equals(TypeDesc.VOID))
 631                         continue;
 632                     mb.loadLocal(factVar);
 633                     mb.loadField(factClassName, "c"+i, fieldTypeDesc);
 634                     CodeBuilderUtils.hashCode(mb, fieldTypeDesc);
 635                     mb.math(Opcodes.IXOR);
 636                     mb.loadConstant(16777619);
 637                     mb.math(Opcodes.IMUL);
 638
 639                 }
 640             mb.returnValue(TypeDesc.INT);
 641             mb.finish();
 642         }
 643
 644         hashIndexClassBuilder.addDefaultConstructor();
 645
 646         return hashIndexClassBuilder;
 647     }
 648 }