Create succ_index_table as a part of `iseq_setup`

With compiling `CPDEBUG >= 2`, `rb_iseq_disasm` segfaults if this
table has not been created.  Also `ibf_load_iseq_each` calls
`rb_iseq_insns_info_encode_positions`.

1 files changed, 7 insertions, 0 deletions

diff --git a/compile.c b/compile.c
index a32a7f1a0b..3c94818641 100644
--- a/compile.c
+++ b/compile.c
@@ -1423,6 +1423,13 @@ iseq_setup(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
     debugs("[compile step 6 (update_catch_except_flags)] \n");
     update_catch_except_flags(iseq->body);
 
+#if VM_INSN_INFO_TABLE_IMPL == 2
+    if (iseq->body->insns_info.succ_index_table == NULL) {
+        debugs("[compile step 7 (rb_iseq_insns_info_encode_positions)] \n");
+        rb_iseq_insns_info_encode_positions(iseq);
+    }
+#endif
+
     if (compile_debug > 1) {
 	VALUE str = rb_iseq_disasm(iseq);
 	printf("%s\n", StringValueCStr(str));