Make Coverage suspendable (#4856)

* Make Coverage suspendable

Add `Coverage.suspend`, `Coverage.resume` and some methods.

[Feature #18176] [ruby-core:105321]

1 files changed, 18 insertions, 5 deletions

diff --git a/thread.c b/thread.c
index 336ac7836c..17510b32f2 100644
--- a/thread.c
+++ b/thread.c
@@ -5746,7 +5746,15 @@ void
 rb_set_coverages(VALUE coverages, int mode, VALUE me2counter)
 {
     GET_VM()->coverages = coverages;
+    GET_VM()->me2counter = me2counter;
     GET_VM()->coverage_mode = mode;
+}
+
+void
+rb_resume_coverages()
+{
+    int mode = GET_VM()->coverage_mode;
+    VALUE me2counter = GET_VM()->me2counter;
     rb_add_event_hook2((rb_event_hook_func_t) update_line_coverage, RUBY_EVENT_COVERAGE_LINE, Qnil, RUBY_EVENT_HOOK_FLAG_SAFE | RUBY_EVENT_HOOK_FLAG_RAW_ARG);
     if (mode & COVERAGE_TARGET_BRANCHES) {
 	rb_add_event_hook2((rb_event_hook_func_t) update_branch_coverage, RUBY_EVENT_COVERAGE_BRANCH, Qnil, RUBY_EVENT_HOOK_FLAG_SAFE | RUBY_EVENT_HOOK_FLAG_RAW_ARG);
@@ -5756,13 +5764,9 @@ rb_set_coverages(VALUE coverages, int mode, VALUE me2counter)
     }
 }
 
-/* Make coverage arrays empty so old covered files are no longer tracked. */
 void
-rb_reset_coverages(void)
+rb_suspend_coverages()
 {
-    rb_clear_coverages();
-    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) {
 	rb_remove_event_hook((rb_event_hook_func_t) update_branch_coverage);
@@ -5772,6 +5776,15 @@ rb_reset_coverages(void)
     }
 }
 
+/* Make coverage arrays empty so old covered files are no longer tracked. */
+void
+rb_reset_coverages(void)
+{
+    rb_clear_coverages();
+    rb_iseq_remove_coverage_all();
+    GET_VM()->coverages = Qfalse;
+}
+
 VALUE
 rb_default_coverage(int n)
 {