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

   1 package org.simantics.scl.compiler.elaboration.expressions;
   2
   3 import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;
   4 import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
   5 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
   6 import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
   7 import org.simantics.scl.compiler.environment.Environment;
   8 import org.simantics.scl.compiler.errors.Locations;
   9 import org.simantics.scl.compiler.internal.codegen.continuations.ICont;
  10 import org.simantics.scl.compiler.internal.codegen.references.IVal;
  11 import org.simantics.scl.compiler.internal.codegen.ssa.exits.Throw;
  12 import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;
  13 import org.simantics.scl.compiler.internal.elaboration.utils.ExpressionDecorator;
  14 import org.simantics.scl.compiler.types.Type;
  15 import org.simantics.scl.compiler.types.Types;
  16 import org.simantics.scl.compiler.types.exceptions.MatchException;
  17
  18 import gnu.trove.map.hash.TObjectIntHashMap;
  19 import gnu.trove.set.hash.THashSet;
  20 import gnu.trove.set.hash.TIntHashSet;
  21
  22 public class GuardedExpressionGroup extends Expression {
  23     public GuardedExpression[] expressions;
  24
  25     public GuardedExpressionGroup(GuardedExpression[] expressions) {
  26         this.expressions = expressions;
  27     }
  28
  29     @Override
  30     public void collectRefs(TObjectIntHashMap<Object> allRefs,
  31             TIntHashSet refs) {
  32         for(GuardedExpression expression : expressions) {
  33             for(Expression guard : expression.guards)
  34                 guard.collectRefs(allRefs, refs);
  35             expression.value.collectRefs(allRefs, refs);
  36         }
  37     }
  38
  39     @Override
  40     public void collectVars(TObjectIntHashMap<Variable> allVars,
  41             TIntHashSet vars) {
  42         for(GuardedExpression expression : expressions) {
  43             for(Expression guard : expression.guards)
  44                 guard.collectVars(allVars, vars);
  45             expression.value.collectVars(allVars, vars);
  46         }
  47     }
  48
  49     @Override
  50     protected void updateType() throws MatchException {
  51         setType(expressions[0].value.getType());
  52     }
  53
  54     @Override
  55     public IVal toVal(Environment env, CodeWriter w) {
  56         CodeWriter success = w.createBlock(getType());
  57         IVal result = success.getParameters()[0];
  58         CodeWriter failure = w.createBlock();
  59         compile(env, w, success.getContinuation(), failure.getContinuation());
  60         w.continueAs(success);
  61         failure.throw_(location, Throw.MatchingException, "Matching failure at: " + toString());
  62         return result;
  63         //throw new InternalCompilerError("GuardedExpressionGroup should be handled in match compilation.");
  64     }
  65
  66     @Override
  67     public void collectFreeVariables(THashSet<Variable> vars) {
  68         for(GuardedExpression expression : expressions) {
  69             for(Expression guard : expression.guards)
  70                 guard.collectFreeVariables(vars);
  71             expression.value.collectFreeVariables(vars);
  72         }
  73     }
  74
  75     @Override
  76     public Expression simplify(SimplificationContext context) {
  77         for(GuardedExpression expression : expressions) {
  78             for(int i=0;i<expression.guards.length;++i)
  79                 expression.guards[i] = expression.guards[i].simplify(context);
  80             expression.value = expression.value.simplify(context);
  81         }
  82         return this;
  83     }
  84
  85     @Override
  86     public Expression resolve(TranslationContext context) {
  87         for(GuardedExpression expression : expressions) {
  88             for(int i=0;i<expression.guards.length;++i)
  89                 expression.guards[i] = expression.guards[i].resolve(context);
  90             expression.value = expression.value.resolve(context);
  91         }
  92         return this;
  93     }
  94
  95     @Override
  96     public Expression checkBasicType(TypingContext context, Type requiredType) {
  97         for(GuardedExpression expression : expressions) {
  98             for(int i=0;i<expression.guards.length;++i)
  99                 expression.guards[i] = expression.guards[i].checkType(context, Types.BOOLEAN);
 100             expression.value = expression.value.checkType(context, requiredType);
 101         }
 102         return this;
 103     }
 104
 105     public void compile(Environment env, CodeWriter firstWriter, ICont success,
 106             ICont lastFailure) {
 107         // Create all code blocks
 108         CodeWriter[] writers = new CodeWriter[expressions.length];
 109         ICont[] failures = new ICont[expressions.length];
 110         writers[0] = firstWriter;
 111         failures[expressions.length-1] = lastFailure;
 112         for(int i=1;i<expressions.length;++i) {
 113             CodeWriter writer = firstWriter.createBlock();
 114             writers[i] = writer;
 115             failures[i-1] = writer.getContinuation();
 116         }
 117
 118         // Compile
 119         for(int i=0;i<expressions.length;++i) {
 120             CodeWriter w = writers[i];
 121             ICont failure = failures[i];
 122
 123             for(Expression guard : expressions[i].guards) {
 124                 CodeWriter nextW = w.createBlock();
 125                 w.if_(guard.toVal(env, w), nextW.getContinuation(), failure);
 126                 w = nextW;
 127             }
 128
 129             w.jump(success, expressions[i].value.toVal(env, w));
 130         }
 131     }
 132
 133     @Override
 134     public Expression replace(ReplaceContext context) {
 135         GuardedExpression[] newExpressions = new GuardedExpression[expressions.length];
 136         for(int i=0;i<expressions.length;++i)
 137             newExpressions[i] = expressions[i].replace(context);
 138         return new GuardedExpressionGroup(newExpressions);
 139     }
 140
 141     @Override
 142     public Expression decorate(ExpressionDecorator decorator) {
 143         for(GuardedExpression expression : expressions)
 144             expression.decorate(decorator);
 145         return decorator.decorate(this);
 146     }
 147
 148     @Override
 149     public void collectEffects(THashSet<Type> effects) {
 150         for(GuardedExpression ge : expressions) {
 151             for(Expression guard : ge.guards)
 152                 guard.collectEffects(effects);
 153             ge.value.collectEffects(effects);
 154         }
 155     }
 156
 157     @Override
 158     public void setLocationDeep(long loc) {
 159         if(location == Locations.NO_LOCATION) {
 160             location = loc;
 161             for(GuardedExpression expression : expressions)
 162                 expression.setLocationDeep(loc);
 163         }
 164     }
 165
 166     @Override
 167     public void accept(ExpressionVisitor visitor) {
 168         visitor.visit(this);
 169     }
 170
 171     @Override
 172     public void forVariables(VariableProcedure procedure) {
 173         for(GuardedExpression expression : expressions)
 174             expression.forVariables(procedure);
 175     }
 176
 177     @Override
 178     public Expression accept(ExpressionTransformer transformer) {
 179         return transformer.transform(this);
 180     }
 181
 182     @Override
 183     public int getSyntacticFunctionArity() {
 184         return expressions[0].value.getSyntacticFunctionArity();
 185     }
 186 }