tarantool / luajit / 6863425940

89%

tarantool/master: 93%

Build Type

push

github

Committed by Buristan

Commit Message

Fix FOLD rule for BUFHDR append.

Reported by XmiliaH.

(cherry-picked from commit bc1bdbf62)

`bufput_append()` may fold `BUFHDR RESET` + `BUFPUT` IRs to `BUFHDR
APPEND` even if the right operand (`BUFSTR`) is the PHI. If it's not the
last IR in the `BUFSTR` chain, this may lead to an incorrect resulting
value in the buffer, which contains a longer string since `APPEND` is
used instead of `RESET`.

This patch adds the corresponding check inside the fold rule.

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

Part of tarantool/tarantool#9145

Run Details

5364 of 5977 branches covered (0.0%)

Branch coverage included in aggregate %.

2 of 2 new or added lines in 1 file covered. (100.0%)

1 existing line in 1 file now uncovered.

20567 of 23323 relevant lines covered (88.18%)

2748985.16 hits per line