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Gareth Rees fd07236307 Tidy-up of attributes and pool classes: ... * Bring design up to date. * New function PoolHasAttr encapsulates attribute checking. * Abstract classes are abstract and mustn't be checked. * The dummy pool class in fotest needs a size. * Abstract pool classes null out methods that they can't provide a generic implementation for, to force subclasses to provide one. * New function PoolTrivFramePopPending provides a generic implementation of that method. * Rename PoolNoFreeWalk to PoolTrivFreeWalk since it has NOOP rather than NOTREACHED. * Check that AttrMOVINGGC implies AttrGC. * Remove unimplemented attributes (BUF_RESERVE, BUF_ALLOC, INCR_RB, INCR_WB, PM) * AMC now inherits from AMCZ instead of the other way round. This is simpler: AMC adds features to AMCZ rather than AMCZ taking features away (and not quite getting it right). * Similarly, LO inherits from AbstractSegBufPoolClass + PoolClassMixInCollect so that it doesn't have to clear AttrSCAN and the scan methods. * Fix bug in MFSCheck -- mustn't check unroundedUnitSize >= UNIT_MIN since small unit sizes are rounded up to UNIT_MIN. * Don't see AttrFREE in MRG (since no free method is supplied). * Check AttrSCAN systematically (in PoolScan and SegCheck) rather than opportunistically in TraceStart and TraceQuantum. Copied from Perforce Change: 185231 ServerID: perforce.ravenbrook.com		2014-04-04 17:05:08 +01:00
mps	Tidy-up of attributes and pool classes:	2014-04-04 17:05:08 +01:00