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Lazily insert origins on prepend to save memory

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98286e9850 made it so that
`Module#include` allocates an origin iclass on each use. Since `include`
is widely used, the extra allocation can contribute significantly to
memory usage.

Instead of always allocating in anticipation of prepend, this change
takes a different approach. The new setup inserts a origin iclass into
the super chains of all the children of the module when prepend happens
for the first time.

rb_ensure_origin is made static again since now that adding an origin
now means walking over all usages, we want to limit the number of places
where we do it.
This commit is contained in:
Alan Wu 2020-07-22 17:27:03 -04:00
parent fdcbb288ab
commit 37e6c83609
Notes: git 2020-07-23 08:01:53 +09:00
3 changed files with 20 additions and 10 deletions
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internal/class.h
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@ -119,7 +119,6 @@ VALUE rb_singleton_class_clone_and_attach(VALUE obj, VALUE attach);
VALUE rb_singleton_class_get(VALUE obj);
int rb_class_has_methods(VALUE c);
void rb_undef_methods_from(VALUE klass, VALUE super);
void rb_ensure_origin(VALUE klass);
static inline void RCLASS_SET_ORIGIN(VALUE klass, VALUE origin);
static inline void RICLASS_SET_ORIGIN_SHARED_MTBL(VALUE iclass);