tarantool / luajit / 8232246359 / 1

93%

tarantool/master: 93%

push

github

Fix recording of __concat metamethod.

Thanks to Sergey Kaplun.

(cherry picked from commit bcc5125a9)

`lj_record_ret()` uses `J->L->base` as a base for recording
concatenation with remaining operands, even if there is a vararg frame
or pcall frame (so it uses the wrong Lua stack slots from a frame
above). This leads to the corresponding assertion failure in the
`lj_record_mm_lookup()`.

This patch adds the calculation of the base adjusment necessary for
correct frame usage.

Sergey Kaplun:
* added the description and the test for the problem

Part of tarantool/tarantool#9595

5659 of 6016 branches covered (94.07%)

Branch coverage included in aggregate %.

21598 of 23412 relevant lines covered (92.25%)

2817745.42 hits per line