llvm dev - Jul 2012 - [LLVMdev] FYI: As of r159525, the LLVM test suite no longer uses tclsh-style quoting!

And there was much rejoicing, but probably also some pain.

I've gotten the builds green (after some minor snafus) on Linux and Mac,
and I think Windows should be fine (forcing the internal lit test runner
passes on Linux).

This has sped up test runs by about 33% on many-core Linux builds. =]


However, for folks who maintain an out-of-tree regression test suite who
were previously relying on the TCL/SH-style rules for interpreting the
RUN-lines of the suite, there may be some issues updating to cope with this.

Below is the tale of terrible tricks I used to update LLVM's test suite.
This should get well over 90% (close to 95% for me) of the conversion, and
the rest is fairly easy to do by hand.

The first step is to build a list of test files containing 'RUN:' lines.
You can use 'grep' or your favorite tool for this. Let's put that
list in
"tests.txt". I'm going to assume you have a modern zsh or
bash-like shell
for the rest:

# First, remove a layer of TCL escaping:
perl -i -pe 's:\\([\\<>\[\]*\$]):\1:g if /.*RUN:\s*(|.*(grep|sed|echo)
[^{\047"|]*){/' $(cat tests.txt)

# Next hide escaped open and close curlies behind sigils
perl -i -pe 's:\\{:##_OPEN_CURLY_##:g if /.*RUN:\s*(|.*(grep|sed|echo)
[^{\047"|]*){/' $(cat tests.txt)
perl -i -pe 's:\\}:##_CLOSE_CURLY_##:g if /.*RUN:\s*(|.*(grep|sed|echo)
[^{\047"|]*){/' $(cat tests.txt)

# This is a good point to checkpoint in git.
# You may want to rewind to here if you hit issues.

# Next up, we iteratively chomp through the TCL-style quotes
# Run this command repeatedly, checkpointing in your local git
# When running it produces no further edits, you're done
perl -i -pe 's!(.*RUN:\s*(|.*(grep|sed|echo)
[^{\047"|]*)){(([^{}]|{[^{}]*})*)}!\1"\4"!' $(cat tests.txt)

# Now switch the sigils back to curlies.
perl -i -pe 's:##_OPEN_CURLY_##:{:g' $(cat tests.txt)
perl -i -pe 's:##_CLOSE_CURLY_##:}:g' $(cat tests.txt)


Note that I have not tested these commands terribly thoroughly, and edited
them in writing the email. ;] Use at your own risk!

Also, feel free to ping me on IRC if you need help converting something
tricky.
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