bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/chr/relations/CHRConstraint.java

   1 package org.simantics.scl.compiler.elaboration.chr.relations;
   2
   3 import java.util.ArrayList;
   4 import java.util.Collection;
   5
   6 import org.cojen.classfile.TypeDesc;
   7 import org.simantics.scl.compiler.compilation.CompilationContext;
   8 import org.simantics.scl.compiler.constants.Constant;
   9 import org.simantics.scl.compiler.constants.JavaMethod;
  10 import org.simantics.scl.compiler.constants.NoRepConstant;
  11 import org.simantics.scl.compiler.constants.generic.CallJava;
  12 import org.simantics.scl.compiler.constants.generic.MethodRef.ConstructorRef;
  13 import org.simantics.scl.compiler.constants.generic.MethodRef.FieldRef;
  14 import org.simantics.scl.compiler.constants.generic.MethodRef.ObjectMethodRef;
  15 import org.simantics.scl.compiler.constants.generic.ParameterStackItem;
  16 import org.simantics.scl.compiler.constants.generic.StackItem;
  17 import org.simantics.scl.compiler.elaboration.chr.CHRRelation;
  18 import org.simantics.scl.compiler.elaboration.chr.CHRRuleset;
  19 import org.simantics.scl.compiler.internal.codegen.chr.CHRCodeGenerationConstants;
  20 import org.simantics.scl.compiler.internal.codegen.chr.CHRRuntimeRulesetCodeGenerator;
  21 import org.simantics.scl.compiler.internal.codegen.references.IVal;
  22 import org.simantics.scl.compiler.internal.codegen.types.JavaTypeTranslator;
  23 import org.simantics.scl.compiler.internal.codegen.types.StandardTypeConstructor;
  24 import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;
  25 import org.simantics.scl.compiler.internal.parsing.Symbol;
  26 import org.simantics.scl.compiler.types.TCon;
  27 import org.simantics.scl.compiler.types.TPred;
  28 import org.simantics.scl.compiler.types.TVar;
  29 import org.simantics.scl.compiler.types.Type;
  30 import org.simantics.scl.compiler.types.Types;
  31
  32 import gnu.trove.map.hash.TIntObjectHashMap;
  33
  34 public class CHRConstraint extends Symbol implements CHRRelation {
  35     public final String name;
  36     public final Type[] parameterTypes;
  37
  38     public boolean implicitlyDeclared;
  39
  40     // Analysis
  41     public int firstPriorityAdded;
  42     public int lastPriorityAdded;
  43     public int firstPriorityRemoved;
  44     public int lastPriorityRemoved;
  45
  46     // Transient info
  47     public CHRRuleset parentRuleset;
  48     public String factClassName;
  49     public Type factType;
  50     public TypeDesc factTypeDesc;
  51
  52     public TCon typeConstructor;
  53     public Constant constructor;
  54     public Constant accessId;
  55     public Constant[] accessors;
  56     public Constant addProcedure;
  57     public Constant removeProcedure;
  58
  59     public TIntObjectHashMap<IndexInfo> indices;
  60
  61     // Query plans
  62     public int minimumPriority = Integer.MAX_VALUE;
  63     public int nextPriority = Integer.MAX_VALUE; // used in code generation
  64
  65     public static class IndexInfo {
  66         public final int indexMask;
  67         public final String indexName;
  68         public final Constant firstFact;
  69         public final Constant nextFact;
  70
  71         public IndexInfo(int indexMask, String indexName, Constant firstFact, Constant nextFact) {
  72             this.indexMask = indexMask;
  73             this.indexName = indexName;
  74             this.firstFact = firstFact;
  75             this.nextFact = nextFact;
  76         }
  77     }
  78
  79     public CHRConstraint(long location, String name, Type[] parameterTypes) {
  80         this.location = location;
  81         this.name = name;
  82         this.parameterTypes = parameterTypes;
  83     }
  84
  85     public void initializeCodeGeneration(CompilationContext context, CHRRuleset parentRuleset) {
  86         JavaTypeTranslator jtt = context.javaTypeTranslator;
  87
  88         this.parentRuleset = parentRuleset;
  89         this.factClassName = parentRuleset.runtimeRulesetName + "$" + name;
  90         TCon factTypeConstructor = Types.con(parentRuleset.runtimeRulesetType.module, parentRuleset.runtimeRulesetType.name + "$" + name);
  91         this.factType = Types.apply(factTypeConstructor, TVar.EMPTY_ARRAY);
  92         this.factTypeDesc = TypeDesc.forClass(factClassName);
  93
  94         Type[] constructorTypes = new Type[parameterTypes.length+1];
  95         constructorTypes[0] = Types.INTEGER;
  96         ArrayList<StackItem> stackItems = new ArrayList<StackItem>(constructorTypes.length);
  97         stackItems.add(new ParameterStackItem(0, Types.INTEGER));
  98         for(int i=0;i<parameterTypes.length;++i) {
  99             Type parameterType = parameterTypes[i];
 100             constructorTypes[i+1] = parameterType;
 101             if(!parameterType.equals(Types.UNIT))
 102                 stackItems.add(new ParameterStackItem(stackItems.size(), parameterType));
 103         }
 104         TypeDesc[] constructorTypeDescs = JavaTypeTranslator.filterVoid(jtt.toTypeDescs(constructorTypes));
 105         this.constructor = new CallJava(TVar.EMPTY_ARRAY, Types.PROC, factType, constructorTypes,
 106                 stackItems.toArray(new StackItem[stackItems.size()]),
 107                 new ConstructorRef(factClassName, constructorTypeDescs),
 108                 null);
 109         //this.constructor = new JavaConstructor(factClassName, Types.PROC, factType, constructorTypes);
 110         this.accessId = new CallJava(TVar.EMPTY_ARRAY, Types.NO_EFFECTS, Types.INTEGER, new Type[] {factType},
 111                 null, new FieldRef(CHRCodeGenerationConstants.CHRFact_name, "id", CHRRuntimeRulesetCodeGenerator.FACT_ID_TYPE), null);
 112         this.accessors = new Constant[parameterTypes.length];
 113         for(int i=0;i<parameterTypes.length;++i) {
 114             TypeDesc typeDesc = jtt.toTypeDesc(parameterTypes[i]);
 115             if(typeDesc.equals(TypeDesc.VOID))
 116                 continue;
 117             this.accessors[i] = new CallJava(TVar.EMPTY_ARRAY, Types.NO_EFFECTS, parameterTypes[i], new Type[] {factType},
 118                     null, new FieldRef(factClassName, CHRCodeGenerationConstants.fieldName(i), jtt.toTypeDesc(parameterTypes[i])), null);
 119         }
 120         this.addProcedure = new CallJava(TVar.EMPTY_ARRAY, Types.PROC, Types.UNIT, new Type[] {parentRuleset.runtimeRulesetType, Types.CHRContext, factType},
 121                 new StackItem[] {new ParameterStackItem(2, factType), new ParameterStackItem(0, parentRuleset.runtimeRulesetType), new ParameterStackItem(1, Types.CHRContext)},
 122                 new ObjectMethodRef(false, factClassName, "add", TypeDesc.VOID, new TypeDesc[] {parentRuleset.runtimeRulesetTypeDesc, CHRCodeGenerationConstants.CHRContext}),
 123                 null);
 124
 125         this.indices = new TIntObjectHashMap<IndexInfo>(Math.min(10, 1 << parameterTypes.length));
 126
 127         if(context.module != null) // for unit testing
 128             context.module.addTypeDescriptor(factTypeConstructor.name, new StandardTypeConstructor(factTypeConstructor, TVar.EMPTY_ARRAY, factTypeDesc));
 129     }
 130
 131     @Override
 132     public TVar[] getTypeVariables() {
 133         return TVar.EMPTY_ARRAY;
 134     }
 135
 136     @Override
 137     public Type[] getParameterTypes() {
 138         return parameterTypes;
 139     }
 140
 141     @Override
 142     public String toString() {
 143         return name;
 144     }
 145
 146     public Collection<IndexInfo> getIndices() {
 147         return indices.valueCollection();
 148     }
 149
 150     public boolean mayBeRemoved() {
 151         return removeProcedure != null;
 152     }
 153
 154     private IndexInfo createIndexInfo(CompilationContext context, int indexMask) {
 155         ArrayList<Type> keyTypeList = new ArrayList<Type>(parameterTypes.length+1);
 156         keyTypeList.add(parentRuleset.runtimeRulesetType);
 157         for(int i=0;i<parameterTypes.length;++i)
 158             if(((indexMask>>i)&1)==1)
 159                 keyTypeList.add(parameterTypes[i]);
 160         String indexName = nameOfIndex(indexMask, parameterTypes.length);
 161         Constant accessIndex;
 162         if(indexMask == 0) {
 163             accessIndex = new CallJava(TVar.EMPTY_ARRAY, Types.PROC, factType, new Type[] {parentRuleset.runtimeRulesetType},
 164                     null, new FieldRef(parentRuleset.runtimeRulesetName, name + "$" + indexName, factTypeDesc), null);
 165         }
 166         else {
 167             Type[] keyTypes = keyTypeList.toArray(new Type[keyTypeList.size()]);
 168             accessIndex = new JavaMethod(true, parentRuleset.runtimeRulesetName, name + "$" + indexName, Types.PROC, factType, keyTypes);
 169         }
 170         return new IndexInfo(
 171                 indexMask,
 172                 indexName,
 173                 accessIndex,
 174                 new CallJava(TVar.EMPTY_ARRAY, Types.PROC, factType, new Type[] {factType},
 175                         null, new FieldRef(factClassName, indexName + "Next", factTypeDesc), null)
 176                 );
 177     }
 178
 179     public IVal fetchFromIndex(CompilationContext context, int boundMask) {
 180         IndexInfo indexInfo = indices.get(boundMask);
 181         if(indexInfo == null) {
 182             indexInfo = createIndexInfo(context, boundMask);
 183             indices.put(boundMask, indexInfo);
 184         }
 185         return indexInfo.firstFact;
 186     }
 187
 188     public Constant nextElement(CompilationContext context, int boundMask) {
 189         IndexInfo indexInfo = indices.get(boundMask);
 190         if(indexInfo == null) {
 191             indexInfo = createIndexInfo(context, boundMask);
 192             indices.put(boundMask, indexInfo);
 193         }
 194         return indexInfo.nextFact;
 195     }
 196
 197
 198     public static String nameOfIndex(int indexMask, int length) {
 199         char[] chars = new char[length];
 200         for(int i=0;i<length;++i)
 201             chars[i] = ((indexMask>>i)&1) == 1 ? 'b' : 'f';
 202         return new String(chars);
 203     }
 204
 205     public void setMayBeRemoved() {
 206         if(removeProcedure == null) {
 207             removeProcedure = new CallJava(TVar.EMPTY_ARRAY, Types.PROC, Types.UNIT, new Type[] {parentRuleset.runtimeRulesetType, factType},
 208                     new StackItem[] {new ParameterStackItem(1, factType), new ParameterStackItem(0, parentRuleset.runtimeRulesetType)},
 209                     new ObjectMethodRef(false, factClassName, "remove", TypeDesc.VOID, new TypeDesc[] {parentRuleset.runtimeRulesetTypeDesc}),
 210                     null);
 211         }
 212     }
 213
 214     public TPred[] getTypeConstraints() {
 215         return TPred.EMPTY_ARRAY;
 216     }
 217
 218     public IVal accessComponent(long location, CodeWriter w, IVal fact, int i) {
 219         Constant accessor = accessors[i];
 220         if(accessor == null)
 221             return NoRepConstant.UNIT;
 222         else
 223             return w.apply(location, accessor, fact);
 224     }
 225 }