tree 442023df1709c91ee03fa28ddc88fa7e5a252542
parent 5d7d672745f29f41813ec57e756e60b225d21669
author Than McIntosh <thanm@google.com> 1588798214 -0400
committer Than McIntosh <thanm@google.com> 1588958372 +0000

gollvm: add a new mechanism for remastering unit tests

Introduce a new mechanism for semi-automatically remastering unit test
expected outputs. Unit test outputs contain LLVM IR dumps, meaning
that if more info is added to the dump, it can cause a lot of tests to
have differences.

When run with the env var GOLLVM_UNITTESTS_EMIT_REMASTER_SCRIPT set,
the unit test itself will emit a transcript of the results that need
remastering to the file "/tmp/remaster-inputs.txt" (expected/actual
dump files will also be written to /tmp). A developer requesting a
remaster can then run

  cd <gollvm_root>/unittests
  go build remaster-tests.go
  ./remaster-tests /tmp/remaster-inputs.txt

which will update the sources based on the newly generated expected
results (which the developed has presumably checked for validity).

Updates golang/go#38728.

Change-Id: I012ae490687e6a1982c3ce70a73ca210825be57c
Reviewed-on: https://go-review.googlesource.com/c/gollvm/+/232739
Reviewed-by: eric fang <eric.fang@arm.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>