X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.scl.compiler%2Fsrc%2Forg%2Fsimantics%2Fscl%2Fcompiler%2Finternal%2Fcodegen%2Fchr%2FCHRFactCodeGenerator.java;fp=bundles%2Forg.simantics.scl.compiler%2Fsrc%2Forg%2Fsimantics%2Fscl%2Fcompiler%2Finternal%2Fcodegen%2Fchr%2FCHRFactCodeGenerator.java;h=06725ec2b813dc4f0693a3b7a066d2f310a1dd4c;hb=2420f847edec02c27130709c8b333a72776f69c6;hp=0000000000000000000000000000000000000000;hpb=c8cce62f9952ab3f6db451d2f22d969b4e777eaa;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/chr/CHRFactCodeGenerator.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/chr/CHRFactCodeGenerator.java
new file mode 100644
index 000000000..06725ec2b
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/chr/CHRFactCodeGenerator.java
@@ -0,0 +1,602 @@
+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 CHRFactCodeGenerator {
+    private static final TypeDesc FACT_ID_TYPE = TypeDesc.INT;
+    private static final String CHRHashIndex_name = "org/simantics/scl/runtime/chr/CHRHashIndex";
+    private static final TypeDesc CHRHashIndex = TypeDesc.forClass(CHRHashIndex_name);
+    private static final String FactActivationQueue_name = "org/simantics/scl/runtime/chr/FactActivationQueue";
+    private static final TypeDesc FactActivationQueue = TypeDesc.forClass(FactActivationQueue_name);
+    private static final String Fact_name = "org/simantics/scl/runtime/chr/Fact";
+    private static final TypeDesc Fact = TypeDesc.forClass(Fact_name);
+    private static final String QUEUE = "queue";
+
+    private ModuleBuilder moduleBuilder; 
+    private JavaTypeTranslator jtt;
+    private CHRRuleset ruleset;
+
+    private ClassBuilder storeClassBuilder;
+    private CHRConstraint constraint;
+
+    private String factClassName;
+    private TypeDesc factTypeDesc;
+    private ClassBuilder factClassBuilder;
+
+    private TypeDesc storeTypeDesc;
+    private TypeDesc[] storeTypeDescArray;
+
+    private TypeDesc[] parameterTypeDescs;
+    private boolean supportsRemoval;
+
+    CHRFactCodeGenerator(ClassBuilder storeClassBuilder, CHRConstraint constraint) {
+        this.storeClassBuilder = storeClassBuilder;
+        this.constraint = constraint;
+        this.ruleset = constraint.parentRuleset;
+
+        this.moduleBuilder = storeClassBuilder.getModuleBuilder();
+        this.jtt = moduleBuilder.getJavaTypeTranslator();
+        this.storeTypeDesc = storeClassBuilder.getType();
+        this.storeTypeDescArray = new TypeDesc[] { storeTypeDesc };
+
+        this.factClassName = storeClassBuilder.getClassName() + "$" + constraint.name;
+        this.factTypeDesc = TypeDesc.forClass(factClassName);
+        this.factClassBuilder = new ClassBuilder(moduleBuilder, Opcodes.ACC_PUBLIC, factClassName, "java/lang/Object", Fact_name);
+
+        this.parameterTypeDescs = jtt.toTypeDescs(constraint.parameterTypes);
+        this.supportsRemoval = constraint.mayBeRemoved();
+    }
+
+    public void generate(ArrayList<StoreInitialization> hashIndexInitializations) {
+        generateFields(hashIndexInitializations);
+        hashIndexInitializations.add(new StoreInitialization(Opcodes.ACC_PRIVATE | Opcodes.ACC_FINAL, constraint.name + "$temp", factTypeDesc, factClassName));
+
+        generateIndices();
+        generateAdd();
+
+        if(supportsRemoval)
+            generateRemove();
+
+        generateIsAlive();
+
+        for(int i=0;i<constraint.plans.size();++i) 
+            generateActivateI(i);
+        generateActivate();
+
+        generateConstructor();
+        factClassBuilder.addDefaultConstructor();
+
+        moduleBuilder.addClass(factClassBuilder);
+    }
+
+    private void generateIndices() {
+        // public ExampleFact ExampleFact$bf(int c0) {
+        //     ExampleFact$temp.c0 = c0;
+        //     return (ExampleFact)ExampleFact_bfIndex.getEqual(ExampleFact$temp);
+        // }
+
+        for(IndexInfo indexInfo : constraint.getIndices()) {
+            if(indexInfo.indexMask != 0) {
+                ArrayList<TypeDesc> getParameterTypeDescs = new ArrayList<TypeDesc>(constraint.parameterTypes.length);
+                for(int i=0;i<constraint.parameterTypes.length;++i)
+                    if(((indexInfo.indexMask>>i)&1)==1)
+                        getParameterTypeDescs.add(parameterTypeDescs[i]);
+                MethodBuilderBase mb = storeClassBuilder.addMethodBase(Opcodes.ACC_PUBLIC, constraint.name + "$" + indexInfo.indexName, factTypeDesc,
+                        getParameterTypeDescs.toArray(new TypeDesc[getParameterTypeDescs.size()]));
+
+                // ExampleFact$temp.c0 = c0;
+                mb.loadThis();
+                mb.loadField(storeClassBuilder.getClassName(), constraint.name + "$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) {
+                        TypeDesc typeDesc = parameterTypeDescs[i];
+                        if(!typeDesc.equals(TypeDesc.VOID)) {
+                            mb.loadLocal(tempFactVar);
+                            mb.loadLocal(mb.getParameter(parameterId));
+                            mb.storeField(factClassName, fieldName(i), typeDesc);
+                        }
+                        ++parameterId;
+                    }
+
+                // return (ExampleFact)ExampleFact_bfIndex.getEqual(ExampleFact$temp);
+                mb.loadThis();
+                mb.loadField(storeClassBuilder.getClassName(), constraint.name + "$" + 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();
+            }
+        }   
+    }
+
+    private THashSet<BoundVar> usedParameters = new THashSet<BoundVar>();
+
+    private void generateActivateI(int i) {
+        PrioritizedPlan plan = constraint.plans.get(i);
+        MethodBuilder mb = factClassBuilder.addMethod(Opcodes.ACC_PUBLIC, "activate" + i, TypeDesc.BOOLEAN, storeTypeDescArray);
+        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();
+    }
+
+    private void generateActivate() {
+        // @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();
+    }
+
+    private void generateConstructor() {
+        // public ExampleFact(int id, int c0, int c1) {
+        //     this.id = id;            
+        //     this.c0 = c0;
+        //     this.c1 = c1;
+        // }
+
+        ArrayList<TypeDesc> constructorParameters = new ArrayList<TypeDesc>(parameterTypeDescs.length+1);
+        constructorParameters.add(FACT_ID_TYPE);
+        for(TypeDesc typeDesc : parameterTypeDescs) {
+            if(typeDesc.equals(TypeDesc.VOID))
+                continue;
+            constructorParameters.add(typeDesc);
+        }
+        MethodBuilderBase mb = factClassBuilder.addConstructor(Opcodes.ACC_PUBLIC, constructorParameters.toArray(new TypeDesc[constructorParameters.size()]));
+        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,parameterId=1;i<constraint.parameterTypes.length;++i) {
+            TypeDesc typeDesc = parameterTypeDescs[i];
+            if(typeDesc.equals(TypeDesc.VOID))
+                continue;
+            mb.loadThis();
+            mb.loadLocal(mb.getParameter(parameterId++));
+            mb.storeField(factClassName, fieldName(i), typeDesc);
+        }
+        mb.returnVoid();
+        mb.finish();
+    }
+
+    private void generateIsAlive() {
+        // @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();
+    }
+
+    private void generateAdd() {
+        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();
+    }
+
+    private void generateFields(ArrayList<StoreInitialization> hashIndexInitializations) {
+        // public int id;
+        // public int c0; // key
+        // public int c1;
+        // public ExampleFact bfPrev;
+        // public ExampleFact bfNext;
+
+        factClassBuilder.addField(Opcodes.ACC_PUBLIC, "id", FACT_ID_TYPE);
+        for(int i=0;i<constraint.parameterTypes.length;++i) {
+            TypeDesc typeDesc = parameterTypeDescs[i];
+            if(typeDesc.equals(TypeDesc.VOID))
+                continue;
+            if(parameterTypeDescs[i] != TypeDesc.VOID)
+                factClassBuilder.addField(Opcodes.ACC_PUBLIC, fieldName(i), typeDesc);
+        }
+
+        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 no 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()));
+            }
+        }
+    }
+
+    private void generateRemove() {
+        // 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();
+    }
+
+    public static String fieldName(int id) {
+        return "c" + id;
+    }
+
+    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, fieldName(i), fieldTypeDesc);
+
+                    mb.loadLocal(bVar);
+                    mb.loadField(factClassName, fieldName(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, fieldName(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;
+    }
+}