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     public String[] fieldNames;
  38
  39     public boolean implicitlyDeclared;
  40
  41     // Analysis
  42     //public int firstPriorityAdded;
  43     public int lastPriorityAdded;
  44     //public int firstPriorityRemoved;
  45     public int lastPriorityRemoved;
  46
  47     // Transient info
  48     public CHRRuleset parentRuleset;
  49     public String factClassName;
  50     public Type factType;
  51     public TypeDesc factTypeDesc;
  52
  53     public TCon typeConstructor;
  54     public Constant constructor;
  55     public Constant accessId;
  56     public Constant[] accessors;
  57     public Constant addProcedure;
  58     public Constant removeProcedure;
  59
  60     public String nextContainerFieldName;
  61
  62     public TIntObjectHashMap<IndexInfo> indices;
  63
  64     public static class IndexInfo {
  65         public final int indexMask;
  66         public final String indexName;
  67         public final Constant firstFact;
  68         public final Constant nextFact;
  69
  70         public IndexInfo(int indexMask, String indexName, Constant firstFact, Constant nextFact) {
  71             this.indexMask = indexMask;
  72             this.indexName = indexName;
  73             this.firstFact = firstFact;
  74             this.nextFact = nextFact;
  75         }
  76     }
  77
  78     public CHRConstraint(long location, String name, Type[] parameterTypes) {
  79         this.location = location;
  80         this.name = name;
  81         this.parameterTypes = parameterTypes;
  82     }
  83
  84     public void initializeCodeGeneration(CompilationContext context, CHRRuleset parentRuleset) {
  85         JavaTypeTranslator jtt = context.javaTypeTranslator;
  86
  87         this.parentRuleset = parentRuleset;
  88         this.factClassName = parentRuleset.runtimeRulesetClassName + "$" + name;
  89         TCon factTypeConstructor = Types.con(parentRuleset.runtimeRulesetType.module, parentRuleset.runtimeRulesetType.name + "$" + name);
  90         this.factType = Types.apply(factTypeConstructor, TVar.EMPTY_ARRAY);
  91         this.factTypeDesc = TypeDesc.forClass(factClassName);
  92
  93         Type[] constructorTypes = new Type[parameterTypes.length+1];
  94         constructorTypes[0] = Types.INTEGER;
  95         ArrayList<StackItem> stackItems = new ArrayList<StackItem>(constructorTypes.length);
  96         stackItems.add(new ParameterStackItem(0, Types.INTEGER));
  97         for(int i=0;i<parameterTypes.length;++i) {
  98             Type parameterType = parameterTypes[i];
  99             constructorTypes[i+1] = parameterType;
 100             if(!parameterType.equals(Types.UNIT))
 101                 stackItems.add(new ParameterStackItem(stackItems.size(), parameterType));
 102         }
 103         TypeDesc[] constructorTypeDescs = JavaTypeTranslator.filterVoid(jtt.toTypeDescs(constructorTypes));
 104         this.constructor = new CallJava(TVar.EMPTY_ARRAY, Types.PROC, factType, constructorTypes,
 105                 stackItems.toArray(new StackItem[stackItems.size()]),
 106                 new ConstructorRef(factClassName, constructorTypeDescs),
 107                 null);
 108         //this.constructor = new JavaConstructor(factClassName, Types.PROC, factType, constructorTypes);
 109         this.accessId = new CallJava(TVar.EMPTY_ARRAY, Types.NO_EFFECTS, Types.INTEGER, new Type[] {factType},
 110                 null, new FieldRef(CHRCodeGenerationConstants.CHRFact_name, "id", CHRRuntimeRulesetCodeGenerator.FACT_ID_TYPE), null);
 111         this.accessors = new Constant[parameterTypes.length];
 112         for(int i=0;i<parameterTypes.length;++i) {
 113             TypeDesc typeDesc = jtt.toTypeDesc(parameterTypes[i]);
 114             if(typeDesc.equals(TypeDesc.VOID))
 115                 continue;
 116             this.accessors[i] = new CallJava(TVar.EMPTY_ARRAY, Types.NO_EFFECTS, parameterTypes[i], new Type[] {factType},
 117                     null, new FieldRef(factClassName, CHRCodeGenerationConstants.fieldName(i), jtt.toTypeDesc(parameterTypes[i])), null);
 118         }
 119         this.addProcedure = new CallJava(TVar.EMPTY_ARRAY, Types.PROC, Types.UNIT, new Type[] {parentRuleset.runtimeRulesetType, Types.CHRContext, factType},
 120                 new StackItem[] {new ParameterStackItem(2, factType), new ParameterStackItem(0, parentRuleset.runtimeRulesetType), new ParameterStackItem(1, Types.CHRContext)},
 121                 new ObjectMethodRef(false, factClassName, "add", TypeDesc.VOID, new TypeDesc[] {parentRuleset.runtimeRulesetTypeDesc, CHRCodeGenerationConstants.CHRContext}),
 122                 null);
 123
 124         this.indices = new TIntObjectHashMap<IndexInfo>(Math.min(10, 1 << parameterTypes.length));
 125
 126         if(context.module != null) // for unit testing
 127             context.module.addTypeDescriptor(factTypeConstructor.name, new StandardTypeConstructor(factTypeConstructor, TVar.EMPTY_ARRAY, factTypeDesc));
 128
 129         // next container
 130         if(parentRuleset.extensible) {
 131             nextContainerFieldName = CHRCodeGenerationConstants.nextContainerName(name);
 132         }
 133     }
 134
 135     @Override
 136     public TVar[] getTypeVariables() {
 137         return TVar.EMPTY_ARRAY;
 138     }
 139
 140     @Override
 141     public Type[] getParameterTypes() {
 142         return parameterTypes;
 143     }
 144
 145     @Override
 146     public String toString() {
 147         return name;
 148     }
 149
 150     public Collection<IndexInfo> getIndices() {
 151         return indices.valueCollection();
 152     }
 153
 154     public boolean mayBeRemoved() {
 155         return removeProcedure != null;
 156     }
 157
 158     private IndexInfo createIndexInfo(CompilationContext context, int indexMask) {
 159         ArrayList<Type> keyTypeList = new ArrayList<Type>(parameterTypes.length+1);
 160         keyTypeList.add(parentRuleset.runtimeRulesetType);
 161         for(int i=0;i<parameterTypes.length;++i)
 162             if(((indexMask>>i)&1)==1)
 163                 keyTypeList.add(parameterTypes[i]);
 164         String indexName = nameOfIndex(indexMask, parameterTypes.length);
 165         Constant accessIndex;
 166         if(indexMask == 0) {
 167             accessIndex = new CallJava(TVar.EMPTY_ARRAY, Types.PROC, factType, new Type[] {parentRuleset.runtimeRulesetType},
 168                     null, new FieldRef(parentRuleset.runtimeRulesetClassName, name + "$" + indexName, factTypeDesc), null);
 169         }
 170         else {
 171             Type[] keyTypes = keyTypeList.toArray(new Type[keyTypeList.size()]);
 172             accessIndex = new JavaMethod(true, parentRuleset.runtimeRulesetClassName, name + "$" + indexName, Types.PROC, factType, keyTypes);
 173         }
 174         return new IndexInfo(
 175                 indexMask,
 176                 indexName,
 177                 accessIndex,
 178                 new CallJava(TVar.EMPTY_ARRAY, Types.PROC, factType, new Type[] {factType},
 179                         null, new FieldRef(factClassName, indexName + "Next", factTypeDesc), null)
 180                 );
 181     }
 182
 183     public IndexInfo getOrCreateIndex(CompilationContext context, int boundMask) {
 184         IndexInfo indexInfo = indices.get(boundMask);
 185         if(indexInfo == null) {
 186             indexInfo = createIndexInfo(context, boundMask);
 187             indices.put(boundMask, indexInfo);
 188         }
 189         return indexInfo;
 190     }
 191
 192     public IVal fetchFromIndex(CompilationContext context, int boundMask) {
 193         return getOrCreateIndex(context, boundMask).firstFact;
 194     }
 195
 196     public Constant nextElement(CompilationContext context, int boundMask) {
 197         IndexInfo indexInfo = indices.get(boundMask);
 198         if(indexInfo == null) {
 199             indexInfo = createIndexInfo(context, boundMask);
 200             indices.put(boundMask, indexInfo);
 201         }
 202         return getOrCreateIndex(context, boundMask).nextFact;
 203     }
 204
 205
 206     public static String nameOfIndex(int indexMask, int length) {
 207         char[] chars = new char[length];
 208         for(int i=0;i<length;++i)
 209             chars[i] = ((indexMask>>i)&1) == 1 ? 'b' : 'f';
 210         return new String(chars);
 211     }
 212
 213     public void setMayBeRemoved() {
 214         if(removeProcedure == null) {
 215             removeProcedure = new CallJava(TVar.EMPTY_ARRAY, Types.PROC, Types.UNIT, new Type[] {parentRuleset.runtimeRulesetType, factType},
 216                     new StackItem[] {new ParameterStackItem(1, factType), new ParameterStackItem(0, parentRuleset.runtimeRulesetType)},
 217                     new ObjectMethodRef(false, factClassName, "remove", TypeDesc.VOID, new TypeDesc[] {parentRuleset.runtimeRulesetTypeDesc}),
 218                     null);
 219         }
 220     }
 221
 222     public TPred[] getTypeConstraints() {
 223         return TPred.EMPTY_ARRAY;
 224     }
 225
 226     public IVal accessComponent(long location, CodeWriter w, IVal fact, int i) {
 227         Constant accessor = accessors[i];
 228         if(accessor == null)
 229             return NoRepConstant.UNIT;
 230         else
 231             return w.apply(location, accessor, fact);
 232     }
 233
 234     @Override
 235     public String[] getFieldNames() {
 236         return fieldNames;
 237     }
 238 }