yui-knk	2018-05-13 21:31:38 +0900 (Sun, 13 May 2018)

  New Revision: 63413

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63413

  Log:
    compile.c: Fix segfault when VM_INSN_INFO_TABLE_IMPL is not 2
    
    * compile.c (ibf_dump_iseq_each): Fix a range of a conditional.
      `positions` is only used when VM_INSN_INFO_TABLE_IMPL is 2.
      And always `dump_body` is expected to be initialized by
      `iseq->body`. For example, `dump_body->insns_info.size` is
      used in `ibf_dump_insns_info_positions`.

  Modified files:
    trunk/compile.c
Index: compile.c
===================================================================
--- compile.c	(revision 63412)
+++ compile.c	(revision 63413)
@@ -8900,10 +8900,10 @@ static ibf_offset_t https://github.com/ruby/ruby/blob/trunk/compile.c#L8900
 ibf_dump_iseq_each(struct ibf_dump *dump, const rb_iseq_t *iseq)
 {
     struct rb_iseq_constant_body dump_body;
-    unsigned int *positions;
 #if VM_INSN_INFO_TABLE_IMPL == 2
-    dump_body = *iseq->body;
+    unsigned int *positions;
 #endif
+    dump_body = *iseq->body;
 
     dump_body.location.pathobj = ibf_dump_object(dump, dump_body.location.pathobj); /* TODO: freeze */
     dump_body.location.base_label = ibf_dump_object(dump, dump_body.location.base_label);

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