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 override ICode VisitUnboxAny(ExprUnboxAny e) {
throw new InvalidOperationException("This should never occur");
}
private Stmt UnboxAny(TypeReference type) {
var value = this.stack.Pop();
var expr = new ExprUnboxAny(this.ctx, value, type);
return this.SsaLocalAssignment(expr);
}
