compile.c: fix tailcall optimization

* compile.c (iseq_peephole_optimize): don't apply tailcall
  optimization to send/invokesuper instructions with blockiseq.
  This is a follow-up to the changes in r51903; blockiseq is now
  the third operand of send/invokesuper instructions.
  [ruby-core:73413] [Bug #12018]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53658 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 2 deletions

diff --git a/compile.c b/compile.c
index 85372ae696..ea9b4905ad 100644
--- a/compile.c
+++ b/compile.c
@@ -2248,8 +2248,12 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
 
 	if (piobj) {
 	    struct rb_call_info *ci = (struct rb_call_info *)piobj->operands[0];
-	    rb_iseq_t *blockiseq = (rb_iseq_t *)piobj->operands[1];
-	    if (blockiseq == 0) {
+	    if (piobj->insn_id == BIN(send) || piobj->insn_id == BIN(invokesuper)) {
+		if (piobj->operands[2] == 0) { /* no blockiseq */
+		    ci->flag |= VM_CALL_TAILCALL;
+		}
+	    }
+	    else {
 		ci->flag |= VM_CALL_TAILCALL;
 	    }
 	}