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.compilation.CompilationContext;
   4 import org.simantics.scl.compiler.elaboration.contexts.ReplaceContext;
   5 import org.simantics.scl.compiler.elaboration.contexts.SimplificationContext;
   6 import org.simantics.scl.compiler.elaboration.contexts.TranslationContext;
   7 import org.simantics.scl.compiler.elaboration.contexts.TypingContext;
   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.types.Type;
  14 import org.simantics.scl.compiler.types.Types;
  15 import org.simantics.scl.compiler.types.exceptions.MatchException;
  16
  17 public class GuardedExpressionGroup extends Expression {
  18     public GuardedExpression[] expressions;
  19
  20     public GuardedExpressionGroup(GuardedExpression[] expressions) {
  21         this.expressions = expressions;
  22     }
  23
  24     @Override
  25     protected void updateType() throws MatchException {
  26         setType(expressions[0].value.getType());
  27     }
  28
  29     @Override
  30     public IVal toVal(CompilationContext context, CodeWriter w) {
  31         CodeWriter success = w.createBlock(getType());
  32         IVal result = success.getParameters()[0];
  33         CodeWriter failure = w.createBlock();
  34         compile(context, w, success.getContinuation(), failure.getContinuation());
  35         w.continueAs(success);
  36         failure.throw_(location, Throw.MatchingException, "Matching failure at: " + toString());
  37         return result;
  38         //throw new InternalCompilerError("GuardedExpressionGroup should be handled in match compilation.");
  39     }
  40
  41     @Override
  42     public Expression simplify(SimplificationContext context) {
  43         for(GuardedExpression expression : expressions) {
  44             for(int i=0;i<expression.guards.length;++i)
  45                 expression.guards[i] = expression.guards[i].simplify(context);
  46             expression.value = expression.value.simplify(context);
  47         }
  48         return this;
  49     }
  50
  51     @Override
  52     public Expression resolve(TranslationContext context) {
  53         for(GuardedExpression expression : expressions) {
  54             for(int i=0;i<expression.guards.length;++i)
  55                 expression.guards[i] = expression.guards[i].resolve(context);
  56             expression.value = expression.value.resolve(context);
  57         }
  58         return this;
  59     }
  60
  61     @Override
  62     public Expression checkBasicType(TypingContext context, Type requiredType) {
  63         for(GuardedExpression expression : expressions) {
  64             for(int i=0;i<expression.guards.length;++i)
  65                 expression.guards[i] = expression.guards[i].checkType(context, Types.BOOLEAN);
  66             expression.value = expression.value.checkType(context, requiredType);
  67         }
  68         return this;
  69     }
  70
  71     public void compile(CompilationContext context, CodeWriter firstWriter, ICont success,
  72             ICont lastFailure) {
  73         // Create all code blocks
  74         CodeWriter[] writers = new CodeWriter[expressions.length];
  75         ICont[] failures = new ICont[expressions.length];
  76         writers[0] = firstWriter;
  77         failures[expressions.length-1] = lastFailure;
  78         for(int i=1;i<expressions.length;++i) {
  79             CodeWriter writer = firstWriter.createBlock();
  80             writers[i] = writer;
  81             failures[i-1] = writer.getContinuation();
  82         }
  83
  84         // Compile
  85         for(int i=0;i<expressions.length;++i) {
  86             CodeWriter w = writers[i];
  87             ICont failure = failures[i];
  88
  89             for(Expression guard : expressions[i].guards) {
  90                 CodeWriter nextW = w.createBlock();
  91                 w.if_(guard.toVal(context, w), nextW.getContinuation(), failure);
  92                 w = nextW;
  93             }
  94
  95             w.jump(success, expressions[i].value.toVal(context, w));
  96         }
  97     }
  98
  99     @Override
 100     public Expression replace(ReplaceContext context) {
 101         GuardedExpression[] newExpressions = new GuardedExpression[expressions.length];
 102         for(int i=0;i<expressions.length;++i)
 103             newExpressions[i] = expressions[i].replace(context);
 104         return new GuardedExpressionGroup(newExpressions);
 105     }
 106
 107     @Override
 108     public void setLocationDeep(long loc) {
 109         if(location == Locations.NO_LOCATION) {
 110             location = loc;
 111             for(GuardedExpression expression : expressions)
 112                 expression.setLocationDeep(loc);
 113         }
 114     }
 115
 116     @Override
 117     public void accept(ExpressionVisitor visitor) {
 118         visitor.visit(this);
 119     }
 120
 121     @Override
 122     public Expression accept(ExpressionTransformer transformer) {
 123         return transformer.transform(this);
 124     }
 125
 126     @Override
 127     public int getSyntacticFunctionArity() {
 128         return expressions[0].value.getSyntacticFunctionArity();
 129     }
 130 }