X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;ds=sidebyside;f=bundles%2Forg.simantics.scl.compiler%2Fsrc%2Forg%2Fsimantics%2Fscl%2Fcompiler%2Finternal%2Fcodegen%2Fchr%2FCHRCodeGenerator.java;fp=bundles%2Forg.simantics.scl.compiler%2Fsrc%2Forg%2Fsimantics%2Fscl%2Fcompiler%2Finternal%2Fcodegen%2Fchr%2FCHRCodeGenerator.java;h=bd7059ee209a15f90c8985b1e89a70e52d82d22e;hb=a8758de5bc19e5adb3f618d3038743a164f09912;hp=0000000000000000000000000000000000000000;hpb=12d9af17384d960b75d58c3935d2b7b46d93e87b;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/chr/CHRCodeGenerator.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/chr/CHRCodeGenerator.java
new file mode 100644
index 000000000..bd7059ee2
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/chr/CHRCodeGenerator.java
@@ -0,0 +1,648 @@
+package org.simantics.scl.compiler.internal.codegen.chr;
+
+import java.util.ArrayList;
+
+import org.cojen.classfile.TypeDesc;
+import org.objectweb.asm.Label;
+import org.objectweb.asm.Opcodes;
+import org.simantics.scl.compiler.elaboration.chr.CHRRuleset;
+import org.simantics.scl.compiler.elaboration.chr.plan.PrioritizedPlan;
+import org.simantics.scl.compiler.elaboration.chr.relations.CHRConstraint;
+import org.simantics.scl.compiler.elaboration.chr.relations.CHRConstraint.IndexInfo;
+import org.simantics.scl.compiler.internal.codegen.references.BoundVar;
+import org.simantics.scl.compiler.internal.codegen.types.JavaTypeTranslator;
+import org.simantics.scl.compiler.internal.codegen.utils.ClassBuilder;
+import org.simantics.scl.compiler.internal.codegen.utils.CodeBuilderUtils;
+import org.simantics.scl.compiler.internal.codegen.utils.Constants;
+import org.simantics.scl.compiler.internal.codegen.utils.LocalVariable;
+import org.simantics.scl.compiler.internal.codegen.utils.MethodBuilder;
+import org.simantics.scl.compiler.internal.codegen.utils.MethodBuilderBase;
+import org.simantics.scl.compiler.internal.codegen.utils.ModuleBuilder;
+
+import gnu.trove.list.array.TIntArrayList;
+import gnu.trove.set.hash.THashSet;
+
+public class CHRCodeGenerator {
+    
+    public static final TypeDesc FACT_ID_TYPE = TypeDesc.INT;
+    public static final String CHRHashIndex_name = "org/simantics/scl/runtime/chr/CHRHashIndex";
+    public static final TypeDesc CHRHashIndex = TypeDesc.forClass(CHRHashIndex_name);
+    public static final String FactActivationQueue_name = "org/simantics/scl/runtime/chr/FactActivationQueue";
+    public static final TypeDesc FactActivationQueue = TypeDesc.forClass(FactActivationQueue_name);
+    public static final String Fact_name = "org/simantics/scl/runtime/chr/Fact";
+    public static final TypeDesc Fact = TypeDesc.forClass(Fact_name);
+    public static final String QUEUE = "queue";
+    
+    private static class StoreInitialization {
+        final int access;
+        final String fieldName;
+        final TypeDesc fieldType;
+        final String className;
+        public StoreInitialization(int access, String fieldName, TypeDesc fieldType, String className) {
+            this.access = access;
+            this.fieldName = fieldName;
+            this.fieldType = fieldType;
+            this.className = className;
+        }
+    }
+    
+    public static void generateStore(ModuleBuilder moduleBuilder, CHRRuleset ruleset) {
+        ClassBuilder storeClassBuilder = new ClassBuilder(moduleBuilder, Opcodes.ACC_PUBLIC, ruleset.storeClassName, "java/lang/Object");
+        if(ruleset.parameters == null)
+            ruleset.parameters = new BoundVar[0];
+        ruleset.parameterTypeDescs = moduleBuilder.getJavaTypeTranslator().getTypeDescs(ruleset.parameters); 
+        
+        ArrayList<StoreInitialization> hashIndexInitializations = new ArrayList<>();
+        for(CHRConstraint constraint : ruleset.constraints)
+            generateFact(storeClassBuilder, constraint, hashIndexInitializations);
+        
+        // Fields
+        for(int i=0;i<ruleset.parameterTypeDescs.length;++i)
+            storeClassBuilder.addField(Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL, "p" + i, ruleset.parameterTypeDescs[i]);
+        storeClassBuilder.addField(Opcodes.ACC_PUBLIC, "currentId", FACT_ID_TYPE);
+        for(StoreInitialization ini : hashIndexInitializations)
+            storeClassBuilder.addField(ini.access, ini.fieldName, ini.fieldType);
+        storeClassBuilder.addField(Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL, QUEUE, FactActivationQueue);
+        
+        // Constructors
+        
+        {
+            MethodBuilderBase mb = storeClassBuilder.addConstructor(Opcodes.ACC_PUBLIC, ruleset.parameterTypeDescs);
+            mb.loadThis();
+            mb.invokeConstructor(storeClassBuilder.getSuperClassName(), Constants.EMPTY_TYPEDESC_ARRAY);
+            for(int i=0;i<ruleset.parameterTypeDescs.length;++i) {
+                mb.loadThis();
+                mb.loadLocal(mb.getParameter(i));
+                mb.storeField(ruleset.storeClassName, "p" + i, ruleset.parameterTypeDescs[i]);
+            }
+            mb.loadThis();
+            mb.loadConstant(1);
+            mb.storeField(storeClassBuilder.getClassName(), "currentId", TypeDesc.INT);
+            for(StoreInitialization ini : hashIndexInitializations) {
+                mb.loadThis();
+                mb.newObject(ini.className);
+                mb.dup();
+                mb.invokeConstructor(ini.className, Constants.EMPTY_TYPEDESC_ARRAY);
+                mb.storeField(ruleset.storeClassName, ini.fieldName, ini.fieldType);
+            }
+            {
+                mb.loadThis();
+                mb.newObject(FactActivationQueue_name);
+                mb.dup();
+                mb.loadConstant(ruleset.priorityCount);
+                mb.invokeConstructor(FactActivationQueue_name, new TypeDesc[] {TypeDesc.INT});
+                mb.storeField(ruleset.storeClassName, QUEUE, FactActivationQueue);
+            }
+            mb.returnVoid();
+            mb.finish();
+        }
+        
+        // Activate
+        
+        {
+            MethodBuilderBase mb = storeClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, "activate", TypeDesc.VOID, new TypeDesc[] {TypeDesc.INT});
+            mb.loadThis();
+            mb.loadField(ruleset.storeClassName, QUEUE, FactActivationQueue);
+            mb.loadThis();
+            mb.loadLocal(mb.getParameter(0));
+            mb.invokeVirtual(FactActivationQueue_name, "activate", TypeDesc.VOID, new TypeDesc[] {TypeDesc.OBJECT, TypeDesc.INT});
+            mb.returnVoid();
+            mb.finish();
+        }
+        
+        moduleBuilder.addClass(storeClassBuilder);
+    }
+    
+    private static void generateFact(ClassBuilder storeClassBuilder, CHRConstraint constraint, ArrayList<StoreInitialization> hashIndexInitializations) {
+        CHRRuleset ruleset = constraint.parentRuleset;
+        boolean supportsRemoval = constraint.mayBeRemoved();
+        
+        ModuleBuilder moduleBuilder = storeClassBuilder.getModuleBuilder();
+        JavaTypeTranslator jtt = moduleBuilder.getJavaTypeTranslator();
+        TypeDesc storeTypeDesc = storeClassBuilder.getType();
+        TypeDesc[] storeTypeDescArray = new TypeDesc[] { storeTypeDesc };
+        
+        String factClassName = storeClassBuilder.getClassName() + "$" + constraint.name;
+        TypeDesc factTypeDesc = TypeDesc.forClass(factClassName);
+        ClassBuilder factClassBuilder = new ClassBuilder(moduleBuilder, Opcodes.ACC_PUBLIC, factClassName, "java/lang/Object", Fact_name);
+        
+        // Fields
+        
+        /* public int id;
+           public int c0; // key
+           public int c1;
+           public ExampleFact bfPrev;
+           public ExampleFact bfNext;
+         */
+        TypeDesc[] parameterTypeDescs = jtt.toTypeDescs(constraint.parameterTypes);
+        factClassBuilder.addField(Opcodes.ACC_PUBLIC, "id", FACT_ID_TYPE);
+        for(int i=0;i<constraint.parameterTypes.length;++i)
+            factClassBuilder.addField(Opcodes.ACC_PUBLIC, "c" + i, parameterTypeDescs[i]);
+        
+        for(IndexInfo indexInfo : constraint.getIndices()) {
+            if(supportsRemoval)
+                factClassBuilder.addField(Opcodes.ACC_PUBLIC, indexInfo.indexName + "Prev", factTypeDesc);
+            factClassBuilder.addField(Opcodes.ACC_PUBLIC, indexInfo.indexName + "Next", factTypeDesc);
+            
+            String hashIndexField = constraint.name + "$" + indexInfo.indexName;
+            if(indexInfo.indexMask == 0) {
+                // If there are now bound parameters, use just a direct reference to a fact
+                storeClassBuilder.addField(Opcodes.ACC_PUBLIC, hashIndexField, factTypeDesc);
+            }
+            else {
+                ClassBuilder hashClass = generateSpecializedHashIndex(storeClassBuilder, constraint, indexInfo, factTypeDesc, factClassName);
+                moduleBuilder.addClass(hashClass);
+                hashIndexInitializations.add(new StoreInitialization(Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL, hashIndexField, CHRHashIndex, hashClass.getClassName()));
+            }
+        }
+        
+        // Method: get
+        
+        hashIndexInitializations.add(new StoreInitialization(Opcodes.ACC_PRIVATE | Opcodes.ACC_FINAL, constraint.name + "$temp", factTypeDesc, factClassName));
+
+        
+        {
+            /*
+            public ExampleFact ExampleFact$bf(int c0) {
+                ExampleFact$temp.c0 = c0;
+                return (ExampleFact)ExampleFact_bfIndex.getEqual(ExampleFact$temp);
+            }
+            */
+            for(IndexInfo indexInfo : constraint.getIndices()) {
+                /*if(indexInfo.indexMask == 0) {
+                    MethodBuilderBase mb = storeClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, constraint.name + "$" + indexInfo.indexName,
+                            factTypeDesc, Constants.EMPTY_TYPEDESC_ARRAY);
+                    mb.loadThis();
+                    mb.loadField(storeClassBuilder.getClassName(), constraint.name + "$" + indexInfo.indexName, factTypeDesc);
+                    mb.returnValue(factTypeDesc);
+                    mb.finish();
+                }*/
+                if(indexInfo.indexMask != 0) {
+                    ArrayList<TypeDesc> getParameterTypeDescs = new ArrayList<TypeDesc>(constraint.parameterTypes.length);
+                    for(int i=0;i<constraint.parameterTypes.length;++i)
+                        if(((indexInfo.indexMask>>i)&1)==1)
+                            getParameterTypeDescs.add(parameterTypeDescs[i]);
+                    MethodBuilderBase mb = storeClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, constraint.name + "$" + indexInfo.indexName, factTypeDesc,
+                            getParameterTypeDescs.toArray(new TypeDesc[getParameterTypeDescs.size()]));
+                    mb.loadThis();
+                    mb.loadField(storeClassBuilder.getClassName(), constraint.name + "$temp", factTypeDesc);
+                    LocalVariable tempFactVar = mb.createLocalVariable("temp", factTypeDesc);
+                    mb.storeLocal(tempFactVar);
+                    int parameterId=0;
+                    for(int i=0;i<constraint.parameterTypes.length;++i)
+                        if(((indexInfo.indexMask>>i)&1)==1) {
+                            mb.loadLocal(tempFactVar);
+                            mb.loadLocal(mb.getParameter(parameterId++));
+                            mb.storeField(factClassName, "c"+i, parameterTypeDescs[i]);
+                        }
+
+                    mb.loadThis();
+                    mb.loadField(storeClassBuilder.getClassName(), constraint.name + "$" + indexInfo.indexName, CHRHashIndex);
+                    mb.loadLocal(tempFactVar);
+                    mb.invokeVirtual(CHRHashIndex_name, supportsRemoval ? "getEqual" : "getEqualNoRemovals", TypeDesc.OBJECT, Constants.OBJECTS[1]);
+                    mb.checkCast(factTypeDesc);
+                
+                    mb.returnValue(factTypeDesc);
+                    mb.finish();
+                }
+            }   
+        }
+        
+        // Method: add
+        
+        {
+            MethodBuilderBase mb = factClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, "add", TypeDesc.VOID, storeTypeDescArray);
+            LocalVariable storeParameter = mb.getParameter(0);
+            for(IndexInfo indexInfo : constraint.getIndices()) {
+                String linkedListPrev = indexInfo.indexName + "Prev";
+                String linkedListNext = indexInfo.indexName + "Next";
+                String storeHashIndexName = constraint.name + "$" + indexInfo.indexName;
+                
+                // public void add(ExampleStore store) {
+                //     bfNext = (ExampleFact)store.ExampleFact_bfIndex.addFreshAndReturnOld(this);
+                //     if(bfNext != null)
+                //         bfNext.bfPrev = this;
+                // }
+                
+                if(indexInfo.indexMask == 0) {
+                    mb.loadThis();
+                    mb.loadLocal(storeParameter);
+                    mb.loadField(storeClassBuilder.getClassName(), storeHashIndexName, factTypeDesc);
+                    if(supportsRemoval)
+                        mb.dupX1();
+                    mb.storeField(factClassName, linkedListNext, factTypeDesc);
+                    if(supportsRemoval) {
+                        Label cont = new Label();
+                        mb.ifNullBranch(cont, true);
+                        mb.loadThis();
+                        mb.loadField(factClassName, linkedListNext, factTypeDesc);
+                        mb.loadThis();
+                        mb.storeField(factClassName, linkedListPrev, factTypeDesc);
+                        mb.setLocation(cont);
+                    }
+                    mb.loadLocal(storeParameter);
+                    mb.loadThis();
+                    mb.storeField(storeClassBuilder.getClassName(), storeHashIndexName, factTypeDesc);
+                }
+                else {
+                    // bfNext = (ExampleFact)store.ExampleFact_bfIndex.addFreshAndReturnOld(this);
+                    mb.loadThis();
+                    mb.loadLocal(storeParameter);
+                    mb.loadField(storeClassBuilder.getClassName(), storeHashIndexName, CHRHashIndex);
+                    mb.loadThis();
+                    mb.invokeVirtual(CHRHashIndex_name, supportsRemoval ? "addFreshAndReturnOld" : "addFreshAndReturnOld", TypeDesc.OBJECT, Constants.OBJECTS[1]);
+                    mb.checkCast(factTypeDesc);
+                    if(supportsRemoval)
+                        mb.dupX1();
+                    mb.storeField(factClassName, linkedListNext, factTypeDesc);
+                    // leaves bfNext on the stack
+
+                    //if(bfNext != null)
+                    //    bfNext.bfPrev = this;
+                    if(supportsRemoval) {
+                        Label cont = new Label();
+                        mb.ifNullBranch(cont, true);
+                        mb.loadThis();
+                        mb.loadField(factClassName, linkedListNext, factTypeDesc);
+                        mb.loadThis();
+                        mb.storeField(factClassName, linkedListPrev, factTypeDesc);
+                        mb.setLocation(cont);
+                    }
+                }
+            }            
+            if(!constraint.isPassive()) {
+                mb.loadLocal(storeParameter);
+                mb.loadField(storeClassBuilder.getClassName(), QUEUE, FactActivationQueue);
+                mb.loadConstant(constraint.getMinimumPriority());
+                mb.loadThis();
+                mb.invokeVirtual(FactActivationQueue_name, "add", TypeDesc.VOID, new TypeDesc[] {TypeDesc.INT, Fact});
+            }
+            mb.returnVoid();
+            mb.finish();
+        }
+        
+        // Method: remove
+
+        if(supportsRemoval) {
+            // public void remove(ExampleStore store) {
+            //     if(bfPrev == null) {
+            //         if(bfNext == null)
+            //             store.ExampleFact_bfIndex.removeKnownToExistKey(this);
+            //         else {
+            //             bfNext.bfPrev = null;
+            //             store.ExampleFact_bfIndex.replaceKnownToExistKey(this, bfNext);
+            //         }
+            //     }
+            //     else {
+            //         bfPrev.bfNext = bfNext;
+            //         if(bfNext != null)
+            //             bfNext.bfPrev = bfPrev;
+            //     }
+            // }
+            
+            MethodBuilderBase mb = factClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, "remove", TypeDesc.VOID, storeTypeDescArray);
+            LocalVariable storeParameter = mb.getParameter(0);
+            for(IndexInfo indexInfo : constraint.getIndices()) {
+                String linkedListPrev = indexInfo.indexName + "Prev";
+                String linkedListNext = indexInfo.indexName + "Next";
+                String storeHashIndexName = constraint.name + "$" + indexInfo.indexName;
+                
+                Label nextIndex = mb.createLabel();
+                
+                // if(bfPrev == null) {
+                mb.loadThis();
+                mb.loadField(factClassName, linkedListPrev, factTypeDesc);
+                Label else1 = new Label();
+                mb.ifNullBranch(else1, false);
+                
+                //     if(bfNext == null)
+                mb.loadThis();
+                mb.loadField(factClassName, linkedListNext, factTypeDesc);
+                Label else2 = new Label();
+                mb.ifNullBranch(else2, false);
+                
+                //         store.ExampleFact_bfIndex.removeKnownToExistKey(this);
+                if(indexInfo.indexMask == 0) {
+                    mb.loadLocal(storeParameter);
+                    mb.loadNull();
+                    mb.storeField(storeClassBuilder.getClassName(), storeHashIndexName, factTypeDesc);
+                }
+                else {
+                    mb.loadLocal(storeParameter);
+                    mb.loadField(storeClassBuilder.getClassName(), storeHashIndexName, CHRHashIndex);
+                    mb.loadThis();
+                    mb.invokeVirtual(CHRHashIndex_name, "removeKnownToExistKey", TypeDesc.VOID, Constants.OBJECTS[1]);
+                }
+                mb.branch(nextIndex);
+                
+                //     else {
+                mb.setLocation(else2);
+                //         bfNext.bfPrev = null;
+                mb.loadThis();
+                mb.loadField(factClassName, linkedListNext, factTypeDesc);
+                mb.loadNull();
+                mb.storeField(factClassName, linkedListPrev, factTypeDesc);
+                //         store.ExampleFact_bfIndex.replaceKnownToExistKey(this, bfNext);
+                if(indexInfo.indexMask == 0) {
+                    mb.loadLocal(storeParameter);
+                    mb.loadThis();
+                    mb.loadField(factClassName, linkedListNext, factTypeDesc);
+                    mb.storeField(storeClassBuilder.getClassName(), storeHashIndexName, factTypeDesc);
+                }
+                else {
+                    mb.loadLocal(storeParameter);
+                    mb.loadField(storeClassBuilder.getClassName(), storeHashIndexName, CHRHashIndex);
+                    mb.loadThis();
+                    mb.loadThis();
+                    mb.loadField(factClassName, linkedListNext, factTypeDesc);
+                    mb.invokeVirtual(CHRHashIndex_name, "replaceKnownToExistKey", TypeDesc.VOID, Constants.OBJECTS[2]);
+                }
+                mb.branch(nextIndex);
+                //     }
+                
+                // else {
+                mb.setLocation(else1);
+                //     bfPrev.bfNext = bfNext;
+                mb.loadThis();
+                mb.loadField(factClassName, linkedListPrev, factTypeDesc);
+                mb.loadThis();
+                mb.loadField(factClassName, linkedListNext, factTypeDesc);
+                mb.storeField(factClassName, linkedListNext, factTypeDesc);
+                //     if(bfNext != null)
+                mb.loadThis();
+                mb.loadField(factClassName, linkedListNext, factTypeDesc);
+                Label else3 = new Label();
+                mb.ifNullBranch(else3, true);
+                //         bfNext.bfPrev = bfPrev;
+                mb.loadThis();
+                mb.loadField(factClassName, linkedListNext, factTypeDesc);
+                mb.loadThis();
+                mb.loadField(factClassName, linkedListPrev, factTypeDesc);
+                mb.storeField(factClassName, linkedListPrev, factTypeDesc);
+                mb.setLocation(else3);
+                mb.branch(nextIndex);
+                // }
+                
+                mb.setLocation(nextIndex);
+            }
+            mb.loadThis();
+            mb.loadConstant(-1);
+            mb.storeField(factClassName, "id", FACT_ID_TYPE);
+            mb.returnVoid();
+            mb.finish();
+        }
+        
+        // Method: isAlive
+
+        {
+            // @Override
+            // public boolean isAlive() {
+            //     return id >= 0;
+            // }
+            
+            MethodBuilderBase mb = factClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, "isAlive", TypeDesc.BOOLEAN, Constants.EMPTY_TYPEDESC_ARRAY);
+            if(supportsRemoval) {
+                mb.loadThis();
+                mb.loadField(factClassName, "id", FACT_ID_TYPE);
+
+                Label thenBranch = mb.createLabel();
+                mb.ifZeroComparisonBranch(thenBranch, "<");
+                mb.loadConstant(true);
+                mb.returnValue(TypeDesc.BOOLEAN);
+
+                mb.setLocation(thenBranch);
+                mb.loadConstant(false);
+                mb.returnValue(TypeDesc.BOOLEAN);
+            }
+            else {
+                mb.loadConstant(true);
+                mb.returnValue(TypeDesc.BOOLEAN);
+            }
+            mb.finish();
+        }
+        
+        // activate parts
+        
+        THashSet<BoundVar> usedParameters = new THashSet<BoundVar>();
+        for(int i=0;i<constraint.plans.size();++i) {
+            PrioritizedPlan plan = constraint.plans.get(i);
+            MethodBuilder mb = factClassBuilder.addMethod(Opcodes.ACC_PUBLIC, "activate" + i, TypeDesc.BOOLEAN, new TypeDesc[] {storeTypeDesc});
+            LocalVariable storeVar = mb.getParameter(0);
+            LocalVariable factVar = new LocalVariable(0, factTypeDesc);
+            mb.setLocalVariable(ruleset.this_, storeVar);
+            mb.setLocalVariable(plan.implementation.getParameters()[0], factVar);
+            
+            // Set closure parameters
+            usedParameters.clear();
+            plan.implementation.forValRefs(valRef -> {
+                if(valRef.getBinding() instanceof BoundVar)
+                    usedParameters.add((BoundVar)valRef.getBinding());
+            });
+            for(int j=0;j<ruleset.parameters.length;++j) {
+                BoundVar parameter = ruleset.parameters[j];
+                if(!usedParameters.contains(parameter))
+                    continue;
+                mb.loadLocal(storeVar);
+                mb.loadField(storeClassBuilder.getClassName(), "p"+j, ruleset.parameterTypeDescs[j]);
+                mb.store(parameter);
+            }
+            
+            // Generate code
+            //System.out.println("=== activate" + i + " ==========================================================");
+            //System.out.println(plan.implementation);
+            plan.implementation.markGenerateOnFly();
+            plan.implementation.generateCodeWithAlreadyPreparedParameters(mb);
+            mb.finish();
+        }
+        
+        // Method: activate
+
+        {
+            // @Override
+            // public int activate(Object context, int priority) {
+            //     return -1;
+            // }
+            
+            MethodBuilderBase mb = factClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, "activate", TypeDesc.INT, new TypeDesc[] {TypeDesc.OBJECT, TypeDesc.INT});
+            Label defaultLabel = mb.createLabel();
+            
+            if(!constraint.isPassive()) {
+                // Check if the fact is alive
+                mb.loadThis();
+                mb.loadField(factClassName, "id", TypeDesc.INT);
+                mb.ifZeroComparisonBranch(defaultLabel, "<");
+
+                mb.loadLocal(mb.getParameter(0));
+                mb.checkCast(storeTypeDesc);
+                LocalVariable storeVariable = new LocalVariable(1, storeTypeDesc);
+                mb.storeLocal(storeVariable);
+
+                TIntArrayList priorities = new TIntArrayList(constraint.plans.size());
+                ArrayList<Label> labels = new ArrayList<Label>();
+                int lastPriority = -1;
+                for(PrioritizedPlan plan : constraint.plans)
+                    if(plan.priority != lastPriority) {
+                        priorities.add(plan.priority);
+                        labels.add(mb.createLabel());
+                        lastPriority = plan.priority;
+                    }
+
+                mb.loadLocal(mb.getParameter(1));
+                mb.switch_(priorities.toArray(), labels.toArray(new Label[labels.size()]), defaultLabel);
+                int labelId = -1;
+                for(int i=0;i<constraint.plans.size();++i) {
+                    PrioritizedPlan plan = constraint.plans.get(i);
+                    if(labelId == -1 || plan.priority != priorities.get(labelId)) {
+                        if(labelId >= 0) {
+                            mb.loadConstant(plan.priority);
+                            mb.returnValue(TypeDesc.INT);
+                        }
+                        ++labelId;
+                        mb.setLocation(labels.get(labelId));
+                    }
+                    mb.loadThis();
+                    mb.loadLocal(storeVariable);
+                    mb.invokeVirtual(factClassName, "activate" + i, TypeDesc.BOOLEAN, new TypeDesc[] {storeTypeDesc});
+                    mb.ifZeroComparisonBranch(defaultLabel, "==");
+                }
+                mb.setLocation(defaultLabel);
+            }
+            mb.loadConstant(-1);
+            mb.returnValue(TypeDesc.INT);
+            mb.finish();
+        }
+        
+        // Constructors
+        
+        {
+            // public ExampleFact(int id, int c0, int c1) {
+            //     this.id = id;            
+            //     this.c0 = c0;
+            //     this.c1 = c1;
+            // }
+            
+            TypeDesc[] constructorParameters = new TypeDesc[parameterTypeDescs.length+1];
+            constructorParameters[0] = FACT_ID_TYPE;
+            for(int i=0;i<parameterTypeDescs.length;++i)
+                constructorParameters[i+1] = parameterTypeDescs[i];
+            MethodBuilderBase mb = factClassBuilder.addConstructor(Opcodes.ACC_PUBLIC, constructorParameters);
+            mb.loadThis();
+            mb.invokeConstructor(factClassBuilder.getSuperClassName(), Constants.EMPTY_TYPEDESC_ARRAY);
+            mb.loadThis();
+            mb.loadLocal(mb.getParameter(0));
+            mb.storeField(factClassName, "id", FACT_ID_TYPE);
+            for(int i=0;i<constraint.parameterTypes.length;++i) {
+                mb.loadThis();
+                mb.loadLocal(mb.getParameter(i+1));
+                mb.storeField(factClassName, "c" + i, parameterTypeDescs[i]);
+            }
+            mb.returnVoid();
+            mb.finish();
+        }
+        factClassBuilder.addDefaultConstructor();
+        
+        moduleBuilder.addClass(factClassBuilder);
+    }
+
+    private static ClassBuilder generateSpecializedHashIndex(ClassBuilder storeClassBuilder, CHRConstraint constraint, IndexInfo indexInfo, TypeDesc factClassTypeDesc, String factClassName) {
+        // new CHRHashIndex() {
+        //     @Override
+        //     protected boolean keyEquals(Object a, Object b) {
+        //         return ((ExampleFact)a).c0 == ((ExampleFact)b).c0;
+        //     }
+        //     @Override
+        //     protected int keyHashCode(Object key) {
+        //         return ((ExampleFact)key).c0;
+        //     }
+        // }
+
+        ModuleBuilder moduleBuilder = storeClassBuilder.getModuleBuilder();
+        JavaTypeTranslator jtt = moduleBuilder.getJavaTypeTranslator();
+        
+        String hashIndexClassName = factClassName + "$" + indexInfo.indexName; 
+        ClassBuilder hashIndexClassBuilder = new ClassBuilder(moduleBuilder, Opcodes.ACC_PUBLIC, hashIndexClassName, "org/simantics/scl/runtime/chr/CHRHashIndex");
+        
+        // Method: keyEquals
+
+        {
+
+            // @Override
+            // protected boolean keyEquals(Object a, Object b) {
+            //     return ((ExampleFact)a).c0 == ((ExampleFact)b).c0;
+            // }
+            
+            MethodBuilderBase mb = hashIndexClassBuilder.addMethodBase(Opcodes.ACC_PROTECTED, "keyEquals", TypeDesc.BOOLEAN, Constants.OBJECTS[2]);
+            mb.loadLocal(mb.getParameter(0));
+            mb.checkCast(factClassTypeDesc);
+            LocalVariable aVar = mb.createLocalVariable("a", factClassTypeDesc);
+            mb.storeLocal(aVar);
+            
+            mb.loadLocal(mb.getParameter(1));
+            mb.checkCast(factClassTypeDesc);
+            LocalVariable bVar = mb.createLocalVariable("b", factClassTypeDesc);
+            mb.storeLocal(bVar);
+
+            Label failure = mb.createLabel();
+            
+            int curMask = indexInfo.indexMask;
+            for(int i=0;i<constraint.parameterTypes.length;++i,curMask>>=1)
+                if((curMask&1) == 1) {
+                    TypeDesc fieldTypeDesc = jtt.toTypeDesc(constraint.parameterTypes[i]);
+                    if(fieldTypeDesc.equals(TypeDesc.VOID))
+                        continue;
+                    mb.loadLocal(aVar);
+                    mb.loadField(factClassName, "c"+i, fieldTypeDesc);
+                    
+                    mb.loadLocal(bVar);
+                    mb.loadField(factClassName, "c"+i, fieldTypeDesc);
+
+                    CodeBuilderUtils.equals(mb, fieldTypeDesc, failure);
+                }
+            mb.loadConstant(true);
+            mb.returnValue(TypeDesc.BOOLEAN);
+            
+            mb.setLocation(failure);
+            mb.loadConstant(false);
+            mb.returnValue(TypeDesc.BOOLEAN);
+            mb.finish();
+        }
+        
+        // Method: keyHashCode
+
+        {
+            // @Override
+            // protected int keyHashCode(Object key) {
+            //     return (0x811C9DC5^((ExampleFact)key).c0)*16777619;
+            // }
+            
+            MethodBuilderBase mb = hashIndexClassBuilder.addMethodBase(Opcodes.ACC_PROTECTED, "keyHashCode", TypeDesc.INT, Constants.OBJECTS[1]);
+            mb.loadLocal(mb.getParameter(0));
+            mb.checkCast(factClassTypeDesc);
+            LocalVariable factVar = mb.createLocalVariable("fact", factClassTypeDesc);
+            mb.storeLocal(factVar);
+
+            mb.loadConstant(0x811C9DC5);
+
+            int curMask = indexInfo.indexMask;
+            for(int i=0;i<constraint.parameterTypes.length;++i,curMask>>=1)
+                if((curMask&1) == 1) {
+                    TypeDesc fieldTypeDesc = jtt.toTypeDesc(constraint.parameterTypes[i]);
+                    if(fieldTypeDesc.equals(TypeDesc.VOID))
+                        continue;
+                    mb.loadLocal(factVar);
+                    mb.loadField(factClassName, "c"+i, fieldTypeDesc);
+                    CodeBuilderUtils.hashCode(mb, fieldTypeDesc);
+                    mb.math(Opcodes.IXOR);
+                    mb.loadConstant(16777619);
+                    mb.math(Opcodes.IMUL);
+
+                }
+            mb.returnValue(TypeDesc.INT);
+            mb.finish();
+        }
+
+        hashIndexClassBuilder.addDefaultConstructor();
+        
+        return hashIndexClassBuilder;
+    }
+}