tarantool / luajit / 7501916055

89%

tarantool/master: 93%

push

github

LJ_GC64: Fix HREFK optimization.

Contributed by XmiliaH.

(cherry-picked from commit 91bc6b8ad)

In `lj_record_idx` when `ix->oldv` is the global nilnode and the
required key is not present in the table, it is possible to pass
the constant key lookup optimization condition because of the
`uint32_t` overflow. Because of that, further recording
incorrectly removes the check for the nilnode, which produces
wrong results when trace is called for a different table.

Maxim Kokryashkin:
* added the description and the test for the problem

Part of tarantool/tarantool#9145

5397 of 5995 branches covered (0.0%)

Branch coverage included in aggregate %.

20679 of 23358 relevant lines covered (88.53%)

2814024.14 hits per line