private void coerce()
{
FTypeRef from = pod.typeRef(u2());
FTypeRef to = pod.typeRef(u2());
// Bool boxing/unboxing
if (from.isBoolPrimitive())
{
if (to.isRef())
{
boolBox(); return;
}
throw new Exception("Coerce " + from + " => " + to);
}
if (to.isBoolPrimitive())
{
if (from.isRef())
{
boolUnbox(!from.isBool()); return;
}
throw new Exception("Coerce " + from + " => " + to);
}
// Int boxing/unboxing
if (from.isIntPrimitive())
{
if (to.isRef())
{
intBox(); return;
}
throw new Exception("Coerce " + from + " => " + to);
}
if (to.isIntPrimitive())
{
if (from.isRef())
{
intUnbox(!from.isInt()); return;
}
throw new Exception("Coerce " + from + " => " + to);
}
// Float boxing/unboxing
if (from.isFloatPrimitive())
{
if (to.isRef())
{
floatBox(); return;
}
throw new Exception("Coerce " + from + " => " + to);
}
if (to.isFloatPrimitive())
{
if (from.isRef())
{
floatUnbox(!from.isFloat()); return;
}
throw new Exception("Coerce " + from + " => " + to);
}
// check nullable => non-nullable
if (from.isNullable() && !to.isNullable())
{
CILLabel nonnull = code.NewLabel();
code.Inst(Op.dup);
code.Inst(Op.ldnull);
code.Branch(BranchOp.bne_un_s, nonnull);
if (parent.NullErrMakeCoerce == null)
{
parent.NullErrMakeCoerce = emitter.findMethod("Fan.Sys.NullErr", "makeCoerce",
new string[0], "Fan.Sys.Err/Val");
}
code.MethInst(MethodOp.call, parent.NullErrMakeCoerce);
code.Inst(Op.throwOp);
code.CodeLabel(nonnull);
}
// don't bother casting to obj
if (to.isObj())
{
return;
}
code.TypeInst(TypeOp.castclass, emitter.findType(to.nname()));
}
