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Refactor VM root modules

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This `st_table` is used to both mark and pin classes
defined from the C API. But `vm->mark_object_ary` already
does both much more efficiently.

Currently a Ruby process starts with 252 rooted classes,
which uses `7224B` in an `st_table` or `2016B` in an `RArray`.

So a baseline of 5kB saved, but since `mark_object_ary` is
preallocated with `1024` slots but only use `405` of them,
it's a net `7kB` save.

`vm->mark_object_ary` is also being refactored.

Prior to this changes, `mark_object_ary` was a regular `RArray`, but
since this allows for references to be moved, it was marked a second
time from `rb_vm_mark()` to pin these objects.

This has the detrimental effect of marking these references on every
minors even though it's a mostly append only list.

But using a custom TypedData we can save from having to mark
all the references on minor GC runs.

Addtionally, immediate values are now ignored and not appended
to `vm->mark_object_ary` as it's just wasted space.
This commit is contained in:
Jean Boussier 2024-03-03 10:46:46 +01:00 • committed by Peter Zhu
parent 16ec54ec41
commit d4f3dcf4df
27 changed files with 167 additions and 101 deletions
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ruby.c
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@ -2202,7 +2202,7 @@ process_options_global_setup(const ruby_cmdline_options_t *opt, const rb_iseq_t
if ((rb_e_script = opt->e_script) != 0) {
rb_str_freeze(rb_e_script);
rb_gc_register_mark_object(opt->e_script);
rb_vm_register_global_object(opt->e_script);
}
rb_execution_context_t *ec = GET_EC();
@ -3070,7 +3070,7 @@ ruby_process_options(int argc, char **argv)
}
set_progname(external_str_new_cstr(script_name)); /* for the time being */
rb_argv0 = rb_str_new4(rb_progname);
rb_gc_register_mark_object(rb_argv0);
rb_vm_register_global_object(rb_argv0);
#ifndef HAVE_SETPROCTITLE
ruby_init_setproctitle(argc, argv);