bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/expressions/EBind.java

   1 package org.simantics.scl.compiler.elaboration.expressions;\r
   2 \r
   3 import org.simantics.scl.compiler.common.exceptions.InternalCompilerError;\r
   4 import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;\r
   5 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;\r
   6 import org.simantics.scl.compiler.elaboration.contexts.TypingContext;\r
   7 import org.simantics.scl.compiler.elaboration.modules.SCLValue;\r
   8 import org.simantics.scl.compiler.environment.Environment;\r
   9 import org.simantics.scl.compiler.errors.Locations;\r
  10 import org.simantics.scl.compiler.internal.codegen.references.IVal;\r
  11 import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;\r
  12 import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;\r
  13 import org.simantics.scl.compiler.types.Type;\r
  14 import org.simantics.scl.compiler.types.Types;\r
  15 import org.simantics.scl.compiler.types.exceptions.MatchException;\r
  16 import org.simantics.scl.compiler.types.exceptions.UnificationException;\r
  17 import org.simantics.scl.compiler.types.kinds.Kinds;\r
  18 \r
  19 import gnu.trove.map.hash.TObjectIntHashMap;\r
  20 import gnu.trove.set.hash.THashSet;\r
  21 import gnu.trove.set.hash.TIntHashSet;\r
  22 \r
  23 public class EBind extends SimplifiableExpression {\r
  24     public Expression pattern;\r
  25     public Expression value;\r
  26     public Expression in;\r
  27     private EVariable monadEvidence;\r
  28     SCLValue bindFunction;\r
  29     Type monadType;\r
  30     Type valueContentType;\r
  31     Type inContentType;\r
  32     \r
  33     public EBind(long loc, Expression pattern, Expression value, Expression in) {\r
  34         super(loc);\r
  35         this.pattern = pattern;\r
  36         this.value = value;\r
  37         this.in = in;\r
  38     }\r
  39 \r
  40     public EBind(long loc, Expression pattern, Expression value, Expression in,\r
  41             SCLValue bindFunction) {\r
  42         super(loc);\r
  43         this.pattern = pattern;\r
  44         this.value = value;\r
  45         this.in = in;\r
  46     }\r
  47 \r
  48     @Override\r
  49     public void collectRefs(final TObjectIntHashMap<Object> allRefs, final TIntHashSet refs) {\r
  50         value.collectRefs(allRefs, refs);\r
  51         in.collectRefs(allRefs, refs);\r
  52     }\r
  53     \r
  54     @Override\r
  55     public void collectVars(TObjectIntHashMap<Variable> allVars,\r
  56             TIntHashSet vars) {\r
  57         value.collectVars(allVars, vars);\r
  58         in.collectVars(allVars, vars);\r
  59     }\r
  60     \r
  61     @Override\r
  62     protected void updateType() throws MatchException {\r
  63         setType(in.getType());\r
  64     }\r
  65     \r
  66     @Override\r
  67     public Expression checkBasicType(TypingContext context, Type requiredType) {\r
  68         monadType = Types.metaVar(Kinds.STAR_TO_STAR);\r
  69         inContentType = Types.metaVar(Kinds.STAR);\r
  70         Type monadContent = Types.apply(monadType, inContentType);\r
  71         try {\r
  72             Types.unify(requiredType, monadContent);\r
  73         } catch (UnificationException e) {\r
  74             context.typeError(location, requiredType, monadContent);\r
  75             return this;\r
  76         }\r
  77         \r
  78         Variable variable = new Variable("monadEvidence");\r
  79         variable.setType(Types.pred(Types.MONAD, monadType));\r
  80         monadEvidence = new EVariable(getLocation(), variable);\r
  81         monadEvidence.setType(variable.getType());\r
  82         context.addConstraintDemand(monadEvidence);\r
  83         \r
  84         pattern = pattern.checkTypeAsPattern(context, Types.metaVar(Kinds.STAR));\r
  85         valueContentType = pattern.getType();\r
  86         value = value.checkType(context, Types.apply(monadType, valueContentType));\r
  87         in = in.checkType(context, requiredType);\r
  88         Type inType = in.getType();\r
  89         setType(inType);\r
  90         return this;\r
  91     }\r
  92 \r
  93     @Override\r
  94     public IVal toVal(Environment env, CodeWriter w) {\r
  95         throw new InternalCompilerError("EBind should be eliminated.");\r
  96     }\r
  97 \r
  98     /**\r
  99      * Splits let \r
 100      */\r
 101     @Override\r
 102     public Expression simplify(SimplificationContext context) {    \r
 103         value = value.simplify(context);\r
 104         in = in.simplify(context);\r
 105         pattern = pattern.simplify(context);\r
 106         \r
 107         long loc = getLocation();\r
 108         Expression simplified = new EApply(loc,\r
 109                 new EConstant(loc, bindFunction, Types.canonical(monadType), Types.canonical(valueContentType), Types.canonical(inContentType)),\r
 110                 monadEvidence, \r
 111                 value,\r
 112                 new ELambda(loc, new Case[] {\r
 113                     new Case(new Expression[] { pattern }, in)\r
 114                 }));\r
 115         simplified.setType(getType());\r
 116         \r
 117         return simplified.simplify(context);\r
 118     }\r
 119 \r
 120     @Override\r
 121     public void collectFreeVariables(THashSet<Variable> vars) {\r
 122         in.collectFreeVariables(vars);\r
 123         value.collectFreeVariables(vars);\r
 124         pattern.removeFreeVariables(vars);\r
 125     }\r
 126 \r
 127     @Override\r
 128     public Expression resolve(TranslationContext context) {\r
 129         value = value.resolve(context);\r
 130         \r
 131         context.pushFrame();\r
 132         pattern = pattern.resolveAsPattern(context);        \r
 133         in = in.resolve(context);\r
 134         context.popFrame();\r
 135         \r
 136         bindFunction = context.getBindFunction();\r
 137         \r
 138         return this; \r
 139     }\r
 140     \r
 141     @Override\r
 142     public Expression decorate(ExpressionDecorator decorator) {\r
 143         pattern = pattern.decorate(decorator);\r
 144         value = value.decorate(decorator);\r
 145         in = in.decorate(decorator);\r
 146         return decorator.decorate(this);\r
 147     }\r
 148 \r
 149     @Override\r
 150     public void collectEffects(THashSet<Type> effects) {\r
 151         pattern.collectEffects(effects);\r
 152         value.collectEffects(effects);\r
 153         in.collectEffects(effects);\r
 154     }\r
 155     \r
 156     @Override\r
 157     public void setLocationDeep(long loc) {\r
 158         if(location == Locations.NO_LOCATION) {\r
 159             location = loc;\r
 160             pattern.setLocationDeep(loc);\r
 161             value.setLocationDeep(loc);\r
 162             in.setLocationDeep(loc);\r
 163         }\r
 164     }\r
 165     \r
 166     @Override\r
 167     public void accept(ExpressionVisitor visitor) {\r
 168         visitor.visit(this);\r
 169     }\r
 170 \r
 171     @Override\r
 172     public void forVariables(VariableProcedure procedure) {\r
 173         pattern.forVariables(procedure);\r
 174         value.forVariables(procedure);\r
 175         if(monadEvidence != null)\r
 176             monadEvidence.forVariables(procedure);\r
 177     }\r
 178     \r
 179     @Override\r
 180     public Expression accept(ExpressionTransformer transformer) {\r
 181         return transformer.transform(this);\r
 182     }\r
 183 \r
 184 }\r