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, 0 insertions, 12 deletions

diff --git a/iseq.c b/iseq.c
index f0239ccde1..186f8622e7 100644
--- a/iseq.c
+++ b/iseq.c
@@ -350,21 +350,9 @@ finish_iseq_build(rb_iseq_t *iseq)
 {
     struct iseq_compile_data *data = ISEQ_COMPILE_DATA(iseq);
     VALUE err = data->err_info;
-    unsigned int i;
     ISEQ_COMPILE_DATA_CLEAR(iseq);
     compile_data_free(data);
 
-    if (ISEQ_COVERAGE(iseq) && ISEQ_LINE_COVERAGE(iseq)) {
-	for (i = 0; i < iseq->body->insns_info_size; i++) {
-	    if (iseq->body->insns_info[i].events & RUBY_EVENT_LINE) {
-		int line_no = iseq->body->insns_info[i].line_no - 1;
-		if (0 <= line_no && line_no < RARRAY_LEN(ISEQ_LINE_COVERAGE(iseq))) {
-		    RARRAY_ASET(ISEQ_LINE_COVERAGE(iseq), line_no, INT2FIX(0));
-		}
-	    }
-	}
-    }
-
     if (RTEST(err)) {
 	VALUE path = pathobj_path(iseq->body->location.pathobj);
 	if (err == Qtrue) err = rb_exc_new_cstr(rb_eSyntaxError, "compile error");