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, 1 deletions

diff --git a/vm_core.h b/vm_core.h
index 374fcff1b2..d1c6cd6574 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -1755,7 +1755,8 @@ RUBY_SYMBOL_EXPORT_BEGIN
 int rb_thread_check_trap_pending(void);
 
 /* #define RUBY_EVENT_RESERVED_FOR_INTERNAL_USE 0x030000 */ /* from vm_core.h */
-#define RUBY_EVENT_COVERAGE_BRANCH              0x010000
+#define RUBY_EVENT_COVERAGE_LINE                0x010000
+#define RUBY_EVENT_COVERAGE_BRANCH              0x020000
 
 extern VALUE rb_get_coverages(void);
 extern void rb_set_coverages(VALUE, int, VALUE);