bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/constants/singletons/ThrowFunction.java

   1 package org.simantics.scl.compiler.constants.singletons;
   2
   3 import org.simantics.scl.compiler.constants.FunctionValue;
   4 import org.simantics.scl.compiler.internal.codegen.references.Val;
   5 import org.simantics.scl.compiler.internal.codegen.ssa.SSABlock;
   6 import org.simantics.scl.compiler.internal.codegen.ssa.SSAStatement;
   7 import org.simantics.scl.compiler.internal.codegen.ssa.exits.Throw2;
   8 import org.simantics.scl.compiler.internal.codegen.ssa.statements.LetApply;
   9 import org.simantics.scl.compiler.internal.codegen.utils.MethodBuilder;
  10 import org.simantics.scl.compiler.internal.codegen.utils.SSASimplificationContext;
  11 import org.simantics.scl.compiler.types.TVar;
  12 import org.simantics.scl.compiler.types.Type;
  13 import org.simantics.scl.compiler.types.Types;
  14 import org.simantics.scl.compiler.types.kinds.Kinds;
  15
  16 public class ThrowFunction extends FunctionValue {
  17
  18     private static final TVar A = Types.var(Kinds.STAR);
  19     private static final TVar B = Types.var(Kinds.STAR);
  20     public static final ThrowFunction INSTANCE =
  21             new ThrowFunction();
  22
  23     private ThrowFunction() {
  24         super(new TVar[] {A, B}, Types.PROC, B, A);
  25     }
  26
  27     @Override
  28     public Type applyExact(MethodBuilder mb, Val[] parameters) {
  29         mb.pushBoxed(parameters[0]);
  30         mb.throwObject();
  31         return getReturnType();
  32     }
  33
  34     @Override
  35     public String toString() {
  36          return "throw";
  37     }
  38
  39     @Override
  40     public void inline(SSASimplificationContext context, LetApply apply) {
  41         if(apply.getParameters().length != 1)
  42             return; // shouldn't be possible
  43
  44         SSABlock block = apply.getParent();
  45         for(SSAStatement statement=apply.getNext();statement != null;statement=statement.getNext())
  46             statement.destroy();
  47         apply.getFunction().remove();
  48         apply.detachThisAndSuccessors();
  49         block.getExit().destroy();
  50         block.setExit(new Throw2(apply.getParameters()[0]));
  51         context.markModified("inline-throw");
  52     }
  53 }