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This commit creates a new directory `gc` to put different GC
implementations and moves the default GC from gc_impl.c to gc/gc_impl.c.
The default GC can be easily switched using the `BUILTIN_GC` variable
in Makefile.in.
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`#ifdef` is inadequate.
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Raison d'etre du gc_impl.c is to purge any internal constructs and rely
solely on our public APIs. rb_source_location_cstr is not public.
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Raison d'etre du gc_impl.c is to purge any internal constructs and rely
solely on our public APIs. rb_gc_obj_slot_size is not public.
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It's an internal function so we can drop the rb_gc_impl
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The function is not used outside of this file.
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When Ruby is built with ASAN and RUBY_FREE_AT_EXIT is enabled, the
following error occurs:
READ of size 8 at 0x74c666610020 thread T0
#0 0x593b6712ecc6 in RB_BUILTIN_TYPE include/ruby/internal/value_type.h:191:30
#1 0x593b6712ecc6 in rb_gc_impl_shutdown_free_objects gc_impl.c:3208:17
#2 0x593b6749a62e in ruby_vm_destruct vm.c:3133:17
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This commit splits gc.c into two files:
- gc.c now only contains code not specific to Ruby GC. This includes
code to mark objects (which the GC implementation may choose not to
use) and wrappers for internal APIs that the implementation may need
to use (e.g. locking the VM).
- gc_impl.c now contains the implementation of Ruby's GC. This includes
marking, sweeping, compaction, and statistics. Most importantly,
gc_impl.c only uses public APIs in Ruby and a limited set of functions
exposed in gc.c. This allows us to build gc_impl.c independently of
Ruby and plug Ruby's GC into itself.
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