[Chicken-janitors] #860: C_in_stackp may be buggy

[Chicken Trac]

#860: C_in_stackp may be buggy
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 Reporter:  felix                   |       Owner:  felix
     Type:  defect                  |      Status:  new  
 Priority:  major                   |   Milestone:       
Component:  unknown                 |     Version:  4.7.x
 Keywords:  C_in_stackp nursery GC  |  
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 There may be situations where an allocation in the nursery exceeds the
 current stack-limit - the limit is "soft", any the check whether the limit
 is reached does take place only in certain functions and only at the start
 of a generated C function. Coalescing of allocations and various other
 factors could create a situation where an object is allocated just slighly
 above the limit which would trigger a minor GC at the next check but may
 leave us with an object that is in the nursery but starts outside of the
 limits.

 Also the use of `C_stack_pointer_test` is not necessary in this function -
 taking the address of a local would be more than sufficient.

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Ticket URL: <http://bugs.call-cc.org/ticket/860>
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