[squeak-dev] Re: push object onto stack

Bert Freudenberg bert at freudenbergs.de
Tue Apr 20 10:27:56 UTC 2010

On 20.04.2010, at 11:45, Ang BeePeng wrote:
> Hi, 
> I found that my object might have been moved by garbage collector. That's
> why pushing oop gives a wrong object. What can I do to stop GC from touching
> my object?

You can't.

That's what pushRemappableOop: is for. Before invoking any function that can cause a GC you need to push the oops you are holding onto. After the function returns, pop them.

Just browse senders of #pushRemappableOop: to see lots of examples. Here is one:

	"remap methodContext in case GC happens during allocation"
	self pushRemappableOop: methodContext.
	newContext := self instantiateContext: (self splObj: ClassBlockContext) sizeInBytes: contextSize.
	methodContext := self popRemappableOop.

- Bert -

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