gc.c: add incremental GC algorithm. [Feature #10137]
Please refer this ticket for details.
This change also introduces the following changes.
Remove RGENGC_AGE2_PROMOTION and introduce object age (0 to 3).
Age can be count with FL_PROMOTE0 and FL_PROMOTE1 flags in
RBasic::flags (2 bit). Age == 3 objects become old objects.
WB_PROTECTED flag in RBasic to WB_UNPROTECTED bitmap.
LONG_LIVED bitmap to represent living objects while minor GCs
It specifies (1) Old objects and (2) remembered shady objects.
Introduce rb_objspace_t::marked_objects which counts marked
objects in current marking phase. marking count is needed to
introduce incremental marking.
rename mark related function and sweep related function to
gc_(marks|sweep)_(start|finish|step|rest|continue).
rename rgengc_report() to gc_report().
Add obj_info() function to get cstr of object details.
Add MEASURE_LINE() macro to measure execution time of specific line.
and many small fixes.
include/ruby/ruby.h: add flag USE_RINCGC.
Now USE_RINCGC can be set only with USE_RGENGC.
include/ruby/ruby.h: introduce FL_PROMOTED0 and add FL_PROMOTED1
to count object age.
include/ruby/ruby.h: rewrite write barriers for incremental marking.
debug.c: catch up flag name changes.
internal.h: add rb_gc_writebarrier_remember() instead of
rb_gc_writebarrier_remember_promoted().
array.c (ary_memcpy0): use rb_gc_writebarrier_remember().
array.c (rb_ary_modify): ditto.
hash.c (rb_hash_keys): ditto.
hash.c (rb_hash_values): ditto.
object.c (init_copy): use rb_copy_wb_protected_attribute() because
FL_WB_PROTECTED is moved from RBasic::flags.
test/objspace/test_objspace.rb: catch up ObjectSpace.dump() changes.
Please refer this ticket for details.
This change also introduces the following changes.
Age can be count with FL_PROMOTE0 and FL_PROMOTE1 flags in
RBasic::flags (2 bit). Age == 3 objects become old objects.
It specifies (1) Old objects and (2) remembered shady objects.
objects in current marking phase. marking count is needed to
introduce incremental marking.
gc_(marks|sweep)_(start|finish|step|rest|continue).
Now USE_RINCGC can be set only with USE_RGENGC.
to count object age.
rb_gc_writebarrier_remember_promoted().
FL_WB_PROTECTED is moved from RBasic::flags.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47444 b2dd03c8-39d4-4d8f-98ff-823fe69b080e