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 String nextContainerFieldName;
  60
  61     public TIntObjectHashMap<IndexInfo> indices;
  62
  63     public static class IndexInfo {
  64         public final int indexMask;
  65         public final String indexName;
  66         public final Constant firstFact;
  67         public final Constant nextFact;
  68
  69         public IndexInfo(int indexMask, String indexName, Constant firstFact, Constant nextFact) {
  70             this.indexMask = indexMask;
  71             this.indexName = indexName;
  72             this.firstFact = firstFact;
  73             this.nextFact = nextFact;
  74         }
  75     }
  76
  77     public CHRConstraint(long location, String name, Type[] parameterTypes) {
  78         this.location = location;
  79         this.name = name;
  80         this.parameterTypes = parameterTypes;
  81     }
  82
  83     public void initializeCodeGeneration(CompilationContext context, CHRRuleset parentRuleset) {
  84         JavaTypeTranslator jtt = context.javaTypeTranslator;
  85
  86         this.parentRuleset = parentRuleset;
  87         this.factClassName = parentRuleset.runtimeRulesetClassName + "$" + name;
  88         TCon factTypeConstructor = Types.con(parentRuleset.runtimeRulesetType.module, parentRuleset.runtimeRulesetType.name + "$" + name);
  89         this.factType = Types.apply(factTypeConstructor, TVar.EMPTY_ARRAY);
  90         this.factTypeDesc = TypeDesc.forClass(factClassName);
  91
  92         Type[] constructorTypes = new Type[parameterTypes.length+1];
  93         constructorTypes[0] = Types.INTEGER;
  94         ArrayList<StackItem> stackItems = new ArrayList<StackItem>(constructorTypes.length);
  95         stackItems.add(new ParameterStackItem(0, Types.INTEGER));
  96         for(int i=0;i<parameterTypes.length;++i) {
  97             Type parameterType = parameterTypes[i];
  98             constructorTypes[i+1] = parameterType;
  99             if(!parameterType.equals(Types.UNIT))
 100                 stackItems.add(new ParameterStackItem(stackItems.size(), parameterType));
 101         }
 102         TypeDesc[] constructorTypeDescs = JavaTypeTranslator.filterVoid(jtt.toTypeDescs(constructorTypes));
 103         this.constructor = new CallJava(TVar.EMPTY_ARRAY, Types.PROC, factType, constructorTypes,
 104                 stackItems.toArray(new StackItem[stackItems.size()]),
 105                 new ConstructorRef(factClassName, constructorTypeDescs),
 106                 null);
 107         //this.constructor = new JavaConstructor(factClassName, Types.PROC, factType, constructorTypes);
 108         this.accessId = new CallJava(TVar.EMPTY_ARRAY, Types.NO_EFFECTS, Types.INTEGER, new Type[] {factType},
 109                 null, new FieldRef(CHRCodeGenerationConstants.CHRFact_name, "id", CHRRuntimeRulesetCodeGenerator.FACT_ID_TYPE), null);
 110         this.accessors = new Constant[parameterTypes.length];
 111         for(int i=0;i<parameterTypes.length;++i) {
 112             TypeDesc typeDesc = jtt.toTypeDesc(parameterTypes[i]);
 113             if(typeDesc.equals(TypeDesc.VOID))
 114                 continue;
 115             this.accessors[i] = new CallJava(TVar.EMPTY_ARRAY, Types.NO_EFFECTS, parameterTypes[i], new Type[] {factType},
 116                     null, new FieldRef(factClassName, CHRCodeGenerationConstants.fieldName(i), jtt.toTypeDesc(parameterTypes[i])), null);
 117         }
 118         this.addProcedure = new CallJava(TVar.EMPTY_ARRAY, Types.PROC, Types.UNIT, new Type[] {parentRuleset.runtimeRulesetType, Types.CHRContext, factType},
 119                 new StackItem[] {new ParameterStackItem(2, factType), new ParameterStackItem(0, parentRuleset.runtimeRulesetType), new ParameterStackItem(1, Types.CHRContext)},
 120                 new ObjectMethodRef(false, factClassName, "add", TypeDesc.VOID, new TypeDesc[] {parentRuleset.runtimeRulesetTypeDesc, CHRCodeGenerationConstants.CHRContext}),
 121                 null);
 122
 123         this.indices = new TIntObjectHashMap<IndexInfo>(Math.min(10, 1 << parameterTypes.length));
 124
 125         if(context.module != null) // for unit testing
 126             context.module.addTypeDescriptor(factTypeConstructor.name, new StandardTypeConstructor(factTypeConstructor, TVar.EMPTY_ARRAY, factTypeDesc));
 127
 128         // next container
 129         if(parentRuleset.extensible) {
 130             nextContainerFieldName = CHRCodeGenerationConstants.nextContainerName(name);
 131         }
 132     }
 133
 134     @Override
 135     public TVar[] getTypeVariables() {
 136         return TVar.EMPTY_ARRAY;
 137     }
 138
 139     @Override
 140     public Type[] getParameterTypes() {
 141         return parameterTypes;
 142     }
 143
 144     @Override
 145     public String toString() {
 146         return name;
 147     }
 148
 149     public Collection<IndexInfo> getIndices() {
 150         return indices.valueCollection();
 151     }
 152
 153     public boolean mayBeRemoved() {
 154         return removeProcedure != null;
 155     }
 156
 157     private IndexInfo createIndexInfo(CompilationContext context, int indexMask) {
 158         ArrayList<Type> keyTypeList = new ArrayList<Type>(parameterTypes.length+1);
 159         keyTypeList.add(parentRuleset.runtimeRulesetType);
 160         for(int i=0;i<parameterTypes.length;++i)
 161             if(((indexMask>>i)&1)==1)
 162                 keyTypeList.add(parameterTypes[i]);
 163         String indexName = nameOfIndex(indexMask, parameterTypes.length);
 164         Constant accessIndex;
 165         if(indexMask == 0) {
 166             accessIndex = new CallJava(TVar.EMPTY_ARRAY, Types.PROC, factType, new Type[] {parentRuleset.runtimeRulesetType},
 167                     null, new FieldRef(parentRuleset.runtimeRulesetClassName, name + "$" + indexName, factTypeDesc), null);
 168         }
 169         else {
 170             Type[] keyTypes = keyTypeList.toArray(new Type[keyTypeList.size()]);
 171             accessIndex = new JavaMethod(true, parentRuleset.runtimeRulesetClassName, name + "$" + indexName, Types.PROC, factType, keyTypes);
 172         }
 173         return new IndexInfo(
 174                 indexMask,
 175                 indexName,
 176                 accessIndex,
 177                 new CallJava(TVar.EMPTY_ARRAY, Types.PROC, factType, new Type[] {factType},
 178                         null, new FieldRef(factClassName, indexName + "Next", factTypeDesc), null)
 179                 );
 180     }
 181
 182     public IndexInfo getOrCreateIndex(CompilationContext context, int boundMask) {
 183         IndexInfo indexInfo = indices.get(boundMask);
 184         if(indexInfo == null) {
 185             indexInfo = createIndexInfo(context, boundMask);
 186             indices.put(boundMask, indexInfo);
 187         }
 188         return indexInfo;
 189     }
 190
 191     public IVal fetchFromIndex(CompilationContext context, int boundMask) {
 192         return getOrCreateIndex(context, boundMask).firstFact;
 193     }
 194
 195     public Constant nextElement(CompilationContext context, int boundMask) {
 196         IndexInfo indexInfo = indices.get(boundMask);
 197         if(indexInfo == null) {
 198             indexInfo = createIndexInfo(context, boundMask);
 199             indices.put(boundMask, indexInfo);
 200         }
 201         return getOrCreateIndex(context, boundMask).nextFact;
 202     }
 203
 204
 205     public static String nameOfIndex(int indexMask, int length) {
 206         char[] chars = new char[length];
 207         for(int i=0;i<length;++i)
 208             chars[i] = ((indexMask>>i)&1) == 1 ? 'b' : 'f';
 209         return new String(chars);
 210     }
 211
 212     public void setMayBeRemoved() {
 213         if(removeProcedure == null) {
 214             removeProcedure = new CallJava(TVar.EMPTY_ARRAY, Types.PROC, Types.UNIT, new Type[] {parentRuleset.runtimeRulesetType, factType},
 215                     new StackItem[] {new ParameterStackItem(1, factType), new ParameterStackItem(0, parentRuleset.runtimeRulesetType)},
 216                     new ObjectMethodRef(false, factClassName, "remove", TypeDesc.VOID, new TypeDesc[] {parentRuleset.runtimeRulesetTypeDesc}),
 217                     null);
 218         }
 219     }
 220
 221     public TPred[] getTypeConstraints() {
 222         return TPred.EMPTY_ARRAY;
 223     }
 224
 225     public IVal accessComponent(long location, CodeWriter w, IVal fact, int i) {
 226         Constant accessor = accessors[i];
 227         if(accessor == null)
 228             return NoRepConstant.UNIT;
 229         else
 230             return w.apply(location, accessor, fact);
 231     }
 232 }