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This implements finalizers by keeping a list of registered finalizers and after every mark but before sweeping check to see if any of them are for unmarked blocks. gcc/ChangeLog: * ggc-common.c (ggc_internal_cleared_alloc): Adjust. * ggc-none.c (ggc_internal_alloc): Assert if a finalizer is passed. (ggc_internal_cleared_alloc): Likewise. * ggc-page.c (finalizer): New class. (vec_finalizer): Likewise. (globals::finalizers): New member. (globals::vec_finalizers): Likewise. (ggc_internal_alloc): Record the finalizer if any for the block being allocated. (ggc_handle_finalizers): New function. (ggc_collect): Call ggc_handle_finalizers. * ggc.h (ggc_internal_alloc): Add arguments to allow installing a finalizer. (ggc_internal_cleared_alloc): Likewise. (finalize): New function. (need_finalization_p): Likewise. (ggc_alloc): Install the type's destructor as the finalizer if it might do something. (ggc_cleared_alloc): Likewise. (ggc_vec_alloc): Likewise. (ggc_cleared_vec_alloc): Likewise. From-SVN: r210568
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