On Tue, Aug 20, 2013 at 11:06 PM, Jan Hubicka <hubi...@ucw.cz> wrote: >> +/* GTY((user)) hooks for symtab_node_base (and its subclasses). >> + We could use virtual functions for this, but given the presence of the >> + "type" field and the trivial size of the class hierarchy, switches are >> + perhaps simpler and faster. */ > > Generally I am not really happy about the hand marking - why can't GTY just > handle > it by itself? Do we have some eisting exmaple of this? > > GTY was in a way of getting proper class hiearchy for quite a while and this > is > probably less ugly than C-syntax-classes we have now. But it would be nice to > have some longer term plan what to do here. Obviously this is going to make > any changes to GGC implementation close to imposible since all the > implementation details are exposed now.
As far as I understand, the intent is to move to user markers, see: http://gcc.gnu.org/ml/gcc-patches/2012-08/msg00630.html On the up-side: This would allow explicitly-tracked objects to be moved back out of GGC-space. Can't wait to put the CFG object back in pools! :-) And I guess symtab objects are also explicitly tracked and therefore candidates for a more cache-friendly allocation strategy... Ciao! Steven
