nobu	2017-06-23 20:15:26 +0900 (Fri, 23 Jun 2017)

  New Revision: 59160

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59160

  Log:
    vm_core.h: sandwich jmpbuf
    
    * vm_core.h (rb_vm_tag): move jmpbuf which should be stored at the
      last in TH_PUSH_TAG, between tag and state so ensure to be
      accessible.  reapplied r40806.

  Modified files:
    trunk/vm_core.h
Index: vm_core.h
===================================================================
--- vm_core.h	(revision 59159)
+++ vm_core.h	(revision 59160)
@@ -691,11 +691,16 @@ typedef RUBY_JMP_BUF rb_jmpbuf_t; https://github.com/ruby/ruby/blob/trunk/vm_core.h#L691
 struct rb_vm_tag {
     VALUE tag;
     VALUE retval;
+    rb_jmpbuf_t buf;
     struct rb_vm_tag *prev;
     enum ruby_tag_type state;
-    rb_jmpbuf_t buf;
 };
 
+STATIC_ASSERT(rb_vm_tag_buf_offset, offsetof(struct rb_vm_tag, buf) > 0);
+STATIC_ASSERT(rb_vm_tag_buf_end,
+	      offsetof(struct rb_vm_tag, buf) + sizeof(rb_jmpbuf_t) <
+	      sizeof(struct rb_vm_tag));
+
 struct rb_vm_protect_tag {
     struct rb_vm_protect_tag *prev;
 };

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