[m-dev.] New conservative GC

[Ralph Becket]

Ralph Becket, Thursday, 12 April 2007:
> Can someone give me any pointers as to where I should start looking in
> the Mercury code for adding a .hgc grade?  In particular, I need to
> ensure that
> (1) the collector is initialised at the start-of-day;
> (2) heap allocation is handled correctly;
> (3) any mutable data is identified;
> (4) tail-call-modulo-cons and CTGC are disabled (they are incompatible
>   with assumption (b)) when HGC is being used.

I forgot to include

(5) any out-of-heap regions (global variables, the trail, etc.) that can
contain heap pointers need to be pointed out to the collector.
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