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Stop marking unit_queue

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The original motivation of this marking was https://github.com/k0kubun/yarv-mjit/issues/20.
As wanabe said, there are multiple options to mitigate the issue, and
Eric Wong introduced another fix at 143776f6fe by checking unit->iseq
inside the lock.

Therefore this particular condition has been covered in two ways, and
the script given by wanabe no longer crashes without mjit_mark().
This commit is contained in:
Takashi Kokubun 2020-12-20 21:54:27 -08:00
parent 74a7877836
commit a574df14e4
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3 changed files with 0 additions and 31 deletions
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27
mjit.c
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@ -937,33 +937,6 @@ mjit_finish(bool close_handle_p)
verbose(1, "Successful MJIT finish");
}
// Called by rb_vm_mark() to mark iseq being JIT-ed and iseqs in the unit queue.
void
mjit_mark(void)
{
if (!mjit_enabled)
return;
RUBY_MARK_ENTER("mjit");
struct rb_mjit_unit *unit = NULL;
CRITICAL_SECTION_START(4, "mjit_mark");
list_for_each(&unit_queue.head, unit, unode) {
if (unit->iseq) { // ISeq is still not GCed
VALUE iseq = (VALUE)unit->iseq;
CRITICAL_SECTION_FINISH(4, "mjit_mark rb_gc_mark");
// Don't wrap critical section with this. This may trigger GC,
// and in that case mjit_gc_start_hook causes deadlock.
rb_gc_mark(iseq);
CRITICAL_SECTION_START(4, "mjit_mark rb_gc_mark");
}
}
CRITICAL_SECTION_FINISH(4, "mjit_mark");
RUBY_MARK_LEAVE("mjit");
}
// Called by rb_iseq_mark() to mark cc_entries captured for MJIT
void
mjit_mark_cc_entries(const struct rb_iseq_constant_body *const body)