From 3bf4c46bb83b6e45f7c0232e34e09f3061de2f13 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 30 Jun 2017 01:56:53 +0000
Subject: [PATCH] vm_insnhelper.c: dump iseq

* vm_insnhelper.c (vm_stack_consistency_error): raise a fatal
  error with the disassembled instruction sequence, in the
  development version, instead of very rarely useful rb_bug in
  such case.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59211 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 vm_insnhelper.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 37e7637450..1d5c3a5d86 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -3325,7 +3325,14 @@ vm_stack_consistency_error(rb_thread_t *th,
     const ptrdiff_t nbp = VM_SP_CNT(th, bp);
     static const char stack_consistency_error[] =
 	"Stack consistency error (sp: %"PRIdPTRDIFF", bp: %"PRIdPTRDIFF")";
+#if defined RUBY_DEVEL
+    VALUE mesg = rb_sprintf(stack_consistency_error, nsp, nbp);
+    rb_str_cat_cstr(mesg, "\n");
+    rb_str_append(mesg, rb_iseq_disasm(cfp->iseq));
+    rb_exc_fatal(rb_exc_new3(rb_eFatal, mesg));
+#else
     rb_bug(stack_consistency_error, nsp, nbp);
+#endif
 }
 
 enum binop_operands_type {