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Always add a header onto objects

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We're targetting systems that need to be able to inspect the kind of an
object, so this information has to be somewhere.  If it's out-of-line,
we might save memory, but we would lose locality.  Concretely in Guile
the tag bits are in the object itself.
This commit is contained in:
Andy Wingo 2022-08-09 16:14:47 +02:00
parent d8bcbf2d74
commit cacc28b577
6 changed files with 14 additions and 20 deletions
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4
gc-api.h
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@ -91,4 +91,8 @@ GC_API_ void gc_finish_for_thread(struct mutator *mut);
GC_API_ void* gc_call_without_gc(struct mutator *mut, void* (*f)(void*),
void *data) GC_NEVER_INLINE;
struct gc_header {
uintptr_t tag;
};
#endif // GC_API_H_