diff options
| -rw-r--r-- | vm_insnhelper.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/vm_insnhelper.c b/vm_insnhelper.c index d7515cd177..061b020930 100644 --- a/vm_insnhelper.c +++ b/vm_insnhelper.c @@ -2212,9 +2212,13 @@ vm_yield_setup_block_args(rb_thread_t *th, const rb_iseq_t * iseq, MEMCPY(argv, RARRAY_PTR(ary), VALUE, argc); } else { - argv[0] = arg0; /* rb_check_array_type(arg0) may change argv */ - /* when to_ary method is invoked and the stack is overwritten, */ - /* so need to restore argv[0]. */ + /* vm_push_frame current argv is at the top of sp because vm_invoke_block + * set sp at the first element of argv. + * Therefore when rb_check_array_type(arg0) called to_ary and called to_ary + * or method_missing run vm_push_frame, it initializes local variables. + * see also https://bugs.ruby-lang.org/issues/8484 + */ + argv[0] = arg0; } /* keyword argument */ |