From 053759edfc80a51eeea0cfa9c46e4bb57589bf00 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 23 Jun 2014 02:35:18 +0000
Subject: Backtrace for SystemStackError

* eval.c (setup_exception): set backtrace in system stack error
  other than the pre-allocated sysstack_error.  [Feature #6216]
* proc.c (Init_Proc): freeze the pre-allocated sysstack_error.
* vm_insnhelper.c (vm_stackoverflow): raise new instance for each
  times without calling any methods to keep the backtrace with no
  further stack overflow.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46502 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 vm_insnhelper.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'vm_insnhelper.c')

diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 64e58f0842..e9dc27139a 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -27,7 +27,9 @@ static rb_control_frame_t *vm_get_ruby_level_caller_cfp(rb_thread_t *th, rb_cont
 static void
 vm_stackoverflow(void)
 {
-    rb_exc_raise(sysstack_error);
+    VALUE e = rb_obj_alloc(rb_eSysStackError);
+    rb_obj_copy_ivar(e, sysstack_error);
+    rb_exc_raise(e);
 }
 
 static inline rb_control_frame_t *
-- 
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