private Stmt UnboxAny(TypeReference type)
{
var value = this.stack.Pop();
var expr = new ExprUnboxAny(this.ctx, value, type);
return(this.SsaLocalAssignment(expr));
}
protected override ICode VisitUnboxAny(ExprUnboxAny e)
{
if (!e.Type.IsValueType)
{
// On ref-type, unbox-any becomes a castclass
var expr = (Expr)this.Visit(e.Expr);
var cast = new ExprCast(e.Ctx, expr, e.Type);
return(cast);
}
var ctx = e.Ctx;
if (e.Type.IsNullable())
{
// If obj==null create Nullable with hasValue=false
// If obj.Type not assignable to e.InnerType throw InvalidCastEx
var innerType = e.Type.GetNullableInnerType();
var unboxMethod = ((Func <object, int?>)InternalFunctions.UnboxAnyNullable <int>).Method.GetGenericMethodDefinition();
var mUnbox = ctx.Module.Import(unboxMethod).MakeGeneric(innerType);
var unboxAnyCall = new ExprCall(ctx, mUnbox, null, e.Expr);
return(unboxAnyCall);
}
else
{
// If obj==null throw NullRefEx
// If obj.Type not assignable to e.Type throw InvalidCastEx
// otherwise unbox
var unboxMethod = ((Func <object, int>)InternalFunctions.UnboxAnyNonNullable <int>).Method.GetGenericMethodDefinition();
var mUnbox = ctx.Module.Import(unboxMethod).MakeGeneric(e.Type);
var unboxAnyCall = new ExprCall(ctx, mUnbox, null, e.Expr);
return(unboxAnyCall);
}
}
protected override ICode VisitUnboxAny(ExprUnboxAny e)
{
this.code.Append("unbox(");
this.Visit(e.Expr);
this.code.Append(")");
return(e);
}
protected virtual ICode VisitUnboxAny(ExprUnboxAny e)
{
this.ThrowOnNoOverride();
var expr = (Expr)this.Visit(e.Expr);
if (expr != e.Expr)
{
return(new ExprUnboxAny(e.Ctx, expr, e.Type));
}
else
{
return(e);
}
}
protected override ICode VisitUnboxAny(ExprUnboxAny e)
{
throw new InvalidOperationException("This should never occur");
}
