yui-knk	2018-05-19 12:43:00 +0900 (Sat, 19 May 2018)

  New Revision: 63468

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63468

  Log:
    iseq.c: Fix segfault when debug is not 0
    
    * iseq.c (get_insn_info_succinct_bitvector): If
      VM_CHECK_MODE is 0, `body->insns_info.positions` is
      freed in `rb_iseq_insns_info_encode_positions`.
      Print `position` only when VM_CHECK_MODE is set.

  Modified files:
    trunk/iseq.c
Index: iseq.c
===================================================================
--- iseq.c	(revision 63467)
+++ iseq.c	(revision 63468)
@@ -1503,13 +1503,19 @@ get_insn_info_succinct_bitvector(const r https://github.com/ruby/ruby/blob/trunk/iseq.c#L1503
     const struct rb_iseq_constant_body *const body = iseq->body;
     size_t size = body->insns_info.size;
     const struct iseq_insn_info_entry *insns_info = body->insns_info.body;
-    const unsigned int *positions = body->insns_info.positions;
     const int debug = 0;
 
     if (debug) {
-	printf("size: %"PRIuSIZE"\n", size);
-	printf("insns_info[%"PRIuSIZE"]: position: %d, line: %d, pos: %"PRIuSIZE"\n",
-	       (size_t)0, positions[0], insns_info[0].line_no, pos);
+#if VM_CHECK_MODE > 0
+        const unsigned int *positions = body->insns_info.positions;
+        printf("size: %"PRIuSIZE"\n", size);
+        printf("insns_info[%"PRIuSIZE"]: position: %d, line: %d, pos: %"PRIuSIZE"\n",
+               (size_t)0, positions[0], insns_info[0].line_no, pos);
+#else
+        printf("size: %"PRIuSIZE"\n", size);
+        printf("insns_info[%"PRIuSIZE"]: line: %d, pos: %"PRIuSIZE"\n",
+               (size_t)0, insns_info[0].line_no, pos);
+#endif
     }
 
     if (size == 0) {

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