thread.c (rb_reset_coverages): remove coverage counters from all ISeqs

When coverage measurement is enabled, the compiler makes each iseq have
a reference to the counter array of coverage.
Even after coverage measurement is disabled, the reference is kept.
And, if coverage measurement is restarted, a coverage hook will increase
the counter.  This is completely meaningless; it brings just overhead.

To remove this meaninglessness, this change removes all the reference
when coverage measuement is stopped.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64504 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/thread.c b/thread.c
index 74a556ba38..b093a9a2e4 100644
--- a/thread.c
+++ b/thread.c
@@ -5404,6 +5404,7 @@ rb_reset_coverages(void)
 {
     VALUE coverages = rb_get_coverages();
     st_foreach(rb_hash_tbl_raw(coverages), reset_coverage_i, 0);
+    rb_iseq_remove_coverage_all();
     GET_VM()->coverages = Qfalse;
     rb_remove_event_hook((rb_event_hook_func_t) update_line_coverage);
     if (GET_VM()->coverage_mode & COVERAGE_TARGET_BRANCHES) {