[fpc-devel] Updated FPC JVM snapshot

[michael.vancanneyt at wisa.be]

On Mon, 7 Nov 2011, Jonas Maebe wrote:

>
> On 07 Nov 2011, at 13:46, michael.vancanneyt at wisa.be wrote:
>
>> On Mon, 7 Nov 2011, Jonas Maebe wrote:
>> 
>>> Yes (once THandle is added to the JVM RTL and it is defined to Pointer or 
>>> JLObject, at least :). It's generally a PrintStream: 
>>> http://download.oracle.com/javase/1,5.0/docs/api/java/lang/System.html#out
>> 
>> Do you have a preference for either of them ?
>
> No, it doesn't matter. Pointer is probably more in line with the rest of the 
> source code. As far as the compiler is concerned, they're the same thing.

I had hoped for this :-)

>
>>> There is however some functionality (e.g. writestr with ansistring) that 
>>> uses the UserData byte array to store a pointer, which won't work on the 
>>> JVM target. Some extra classes will also have to be moved from the jdk15 
>>> unit to the system unit to implement the functionality.
>> 
>> That brings me to my second question/remark: (which I had already prepared 
>> before sending my first mail ;) ):
>> 
>> It would be easier if the system unit could depend on jdk15 in the
>> implementation section.
>> 
>> However, this is something that FPC never has been able to do, while Delphi 
>> can. It would be good if FPC could do the same, it would make some system 
>> units easier to manage. (in casu: the Java one)
>
> Well, in that case we could just get rid of the jdk15 unit altogether and put 
> everything directly in the system unit. The main reason I didn't do that is 
> because it makes loading the system unit slower due to the tons of 
> definitions (otoh, most "real" programs will probably use the jdk15 unit one 
> way or another anyway). It's true that the downside is that occasionally 
> definitions have to be moved from the jdk15 unit to the system unit.

>From a maintenance point of view, I think it is better if they stay in a
separate unit.

As long as the system unit cannot handle separate units we can maybe make 
a jdk15sys.inc, and include this in jdk15.pp and in the implementation 
section of system.

Michael.