compile.c: add a RUBY_EVENT_COVERAGE_LINE event for line coverage

2.5's line coverage measurement was about two times slower than 2.4
because of two reasons; (1) vm_trace uses rb_iseq_event_flags (which
takes O(n) currently where n is the length of iseq) to get an event
type, and (2) RUBY_EVENT_LINE uses setjmp to call an event hook.

This change adds a special event for line coverage,
RUBY_EVENT_COVERAGE_LINE, and adds `tracecoverage` instructions where
the event occurs in iseq.
`tracecoverage` instruction calls an event hook without vm_trace.
And, RUBY_EVENT_COVERAGE_LINE is an internal event which does not
use setjmp.

This change also cancells lineno change due to the deletion of trace
instructions [Feature #14104].  So fixes [Bug #14191].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61350 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 2 deletions

diff --git a/thread.c b/thread.c
index 2b0954e803..2460d7e3ac 100644
--- a/thread.c
+++ b/thread.c
@@ -5035,7 +5035,7 @@ update_line_coverage(VALUE data, const rb_trace_arg_t *trace_arg)
     if (RB_TYPE_P(coverage, T_ARRAY) && !RBASIC_CLASS(coverage)) {
 	VALUE lines = RARRAY_AREF(coverage, COVERAGE_INDEX_LINES);
 	if (lines) {
-	    long line = rb_sourceline() - 1;
+	    long line = FIX2INT(trace_arg->data) - 1;
 	    long count;
 	    VALUE num;
 	    if (line >= RARRAY_LEN(lines)) { /* no longer tracked */
@@ -5157,7 +5157,7 @@ rb_set_coverages(VALUE coverages, int mode, VALUE me2counter)
 {
     GET_VM()->coverages = coverages;
     GET_VM()->coverage_mode = mode;
-    rb_add_event_hook2((rb_event_hook_func_t) update_line_coverage, RUBY_EVENT_LINE, Qnil, RUBY_EVENT_HOOK_FLAG_SAFE | RUBY_EVENT_HOOK_FLAG_RAW_ARG);
+    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);
     }