shyouhei	2018-05-09 18:53:19 +0900 (Wed, 09 May 2018)

  New Revision: 63375

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63375

  Log:
    align jmp_buf to VALUE
    
    This ec->machine.regs is marked by GC. However jmp_buf is
    not defined by us.  There are chances of unaligned access.
    We should force it VALUE-aligned.

  Modified files:
    trunk/vm_core.h
Index: vm_core.h
===================================================================
--- vm_core.h	(revision 63374)
+++ vm_core.h	(revision 63375)
@@ -823,7 +823,7 @@ typedef struct rb_execution_context_stru https://github.com/ruby/ruby/blob/trunk/vm_core.h#L823
 	VALUE *register_stack_end;
 	size_t register_stack_maxsize;
 #endif
-	jmp_buf regs;
+	RUBY_ALIGNAS(SIZEOF_VALUE) jmp_buf regs;
     } machine;
 } rb_execution_context_t;
 

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