Hi Stephan,
Thanks for replying from your hotel,
On Wed, Jan 09, 2002 at 11:47:59PM +0100, Stephan Rudlof wrote:
Somewhat late, since I'm sitting in a hotel (working outside and had big problems to connect...), but here are a few hints:
Joshua 'Schwa' Gargus wrote:
Hello,
I'm having trouble passing around a pointer between interpreted Squeak code and compiled plugin code. I have a primitive method that returns a pointer like this:
^ aPtr asOop: Unsigned
This seems to work fine; depending on the value, I get either a SmallInteger or a LargePositiveInteger. The problem arises when I try to pass this into another primitive method that looks like this:
primNeedPointer: aPtr
self primitive: 'primNeedPointer' parameters: #(Unsigned) "more stuff..."The generated C code causing the failure is:
interpreterProxy->success(interpreterProxy->isKindOf(interpreterProxy->stackValue(0), "Unsigned"));
Looking at the code for isKindOf(), it is clear why it fails: the object (a SmallInteger or LargePositiveInteger) is not an instance of Unsigned or one of its subclasses.
You could use "Integer" here.
But there is another problem: if you have a LargeInteger as 'ptr' its oop may have changed between the calls of the two prims.
I suppose that this is because of a possible garbage collection. However, I'm failing to see why this is a problem, since the value of the LargeInteger would be the same even if its oop changed. Could you clarify exactly what the problem is?
Thanks again, Joshua
Greetings,
Stephan
I followed the directions on: http://minnow.cc.gatech.edu/squeak/850 as closely as possible. What am I doing wrong?
Thanks, Joshua
-- Stephan Rudlof (sr@evolgo.de) "Genius doesn't work on an assembly line basis. You can't simply say, 'Today I will be brilliant.'" -- Kirk, "The Ultimate Computer", stardate 4731.3