# Get\_destination\_insn must not skip ADJUST

**URL:** <https://www.ruby-forum.com/t/get-destination-insn-must-not-skip-adjust/127335>\
**Category:** Development\
**Created:** [January 28, 2008, 12:55pm UTC](https://www.ruby-forum.com/t/get-destination-insn-must-not-skip-adjust/127335 "2008-01-28T12:55:08Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Yusuke\_ENDOH](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/c89c15/32.png) [@Yusuke\_ENDOH](https://www.ruby-forum.com/u/Yusuke_ENDOH)\
**Post date:** [January 28, 2008, 12:55pm UTC](https://www.ruby-forum.com/t/get-destination-insn-must-not-skip-adjust/127335/1 "2008-01-28T12:55:08Z")

</div>

e$B1sF#$H?=$7$^$9!#e(B

1.9 e$B$,0J2\<$GMn$A$^$9!#e(B

$ ./ruby -e ‘nil while ([0, (false ? 1 : redo; 2)])’  
-e:1: [BUG] Segmentation fault  
ruby 1.9.0 (2008-01-28 revision 15294) [i686-linux]

## – control frame ---------- c:0003 p:0002 s:303206399 b:0006 l:000005 d:000005 TOP -e:1 c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH :inherited c:0001 p:0000 s:0002 b:0002 l:000001 d:000001 TOP :17

## – backtrace of native function call (Use addr2line) – 0x80ef855 0x810e2ce 0x810e32b 0x80be760 0xffffe440 0x80ed264 0x80ed59d 0x805a7f9 0x805e940 0x8058221 0xb7dd2ea8 0x8058131

e$B%"%!\<%H$7$^$7$?e(B

get\_destination\_insn e$B$,e(B ADJUST  
e$B$rFI$\_Ht$P$7$F$$$k$N$,860x$G$9!#e(B  
e$B0J2\<$GF0$-$^$9$,!"B\>$NLdBj$r0z$-5/$3$9$+$b$7$l$^$;$s!#e(B  
(line\_no == -1 e$B$Je(B ADJUST e$B$OFI$\_Ht$P$9$Y$-!)$H$+e(B)

# Index: compile.c

— compile.c (revision 15294)  
+++ compile.c (working copy)  
@@ -1320,7 +1320,7 @@

```
 list = lobj->link.next;
 while (list) {

```

- if (list-\>type == ISEQ\_ELEMENT\_INSN) {

- if (list-\>type == ISEQ\_ELEMENT\_INSN || list-\>type ==  
ISEQ\_ELEMENT\_ADJUST) {  
break;  
}  
list = list-\>next;