Hi Marc,
we're preparing a brief guide to porting X10 applications from v1.7 to
v2.0. Please take a look and let me know if it's helpful - and feel free
to contribute!
http://docs.codehaus.org/display/XTENLANG/Porting+from+X10+1.7+to+X10+2.0
Cheers,
Josh
Igor Peshansky wrote:
> "TAJCHMAN Marc" <marc.tajch...@cea.fr> wrote on 10/27/2009 06:10:18 PM:
>
>
>> Hi,
>>
>> The following code compiles and runs with x10 1.7.6 :
>>
>> // laplacian.x10
>> import params;
>>
>> public class laplacian {
>>
>> var p:params = new params();
>>
>> def this(args : Rail[String]) {
>> p.parse(args);
>> }
>>
>> public static def main(args : Rail[String]) {
>> var l:laplacian = new laplacian(args);
>> }
>> }
>>
>> // params.x10
>> public class params {
>>
>> var n:Rail[int] = Rail.makeVar[int](3);
>>
>> def parse(args : Rail[String])
>> {
>> n(0) = int.parseInt(args(0));
>> n(1) = int.parseInt(args(1));
>> n(2) = int.parseInt(args(2));
>> }
>> };
>>
>> When I try to compile it using svn r11743 (to test the x10mpi
>> runtime), there are 2 kinds of error messages :
>>
>>
>>> laplacian.x10:8: Cannot read fields of the proto value proto
>>>
> laplacian.this
>
>>> params.x10:7: Place type error: method target args cannot be
>>>
>> determined to be at x10.lang.Place.x10.lang.Place#FIRST_PLACE{}
>>
>> The second one can be removed by adding a "!" near the end of line 5
>> in params.x10.
>> But I cannot find a solution to the other error.
>>
>> What is the meaning of these messages ?
>>
>
> Hi, Marc,
>
> The first message says that you cannot read fields of an object that is
> not
> fully initialized (i.e., whose constructor has not completed, a.k.a. proto
> object). The way to fix it in your code is to change the constructor of
> laplacian as follows:
>
> def this(args : Rail[String]) {
> val p_ = new params();
> p_.parse(args);
> this.p = p_;
> }
>
> The second message means that you're trying to invoke a non-global method
> (namely, apply()) on an object that is not statically known to be local to
> the place where you're invoking the method. You have to assert that it
> is,
> by adding "!" after the type.
>
> Hope this helps,
> Igor
>
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