You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
2.6 KiB
Markdown
67 lines
2.6 KiB
Markdown
5 years ago
|
## Contributing to Garble
|
||
|
|
|
||
|
|
Thank you for your interest in contributing! Here are some ground rules:
|
||
|
|
|
||
|
|
1. The tool's design decisions are in the [README](README.md)
|
||
|
|
2. New features or major changes should be opened as an issue first
|
||
|
|
3. Non-trivial contributions should be done in PRs with code review and CI
|
||
|
|
4. We use the `#obfuscation` channel over at the [Gophers Slack](https://invite.slack.golangbridge.org/) to chat
|
||
|
|
|
||
|
|
### Testing
|
||
|
|
|
||
|
|
Just the usual `go test ./...`; many of the tests are in
|
||
|
|
[testscript](https://godoc.org/github.com/rogpeppe/go-internal/testscript) under
|
||
|
|
`testdata/script/`, which allows laying out files and shell-like steps to run as
|
||
|
|
part of the test.
|
||
|
|
|
||
|
|
Note that the tests do real builds, so they are quite slow; on an average
|
||
|
|
laptop, `go test` can take over thirty seconds. Here are some tips:
|
||
|
|
|
||
|
|
* Use `go test -short` to skip some extra sanity checks
|
||
|
|
* Use `go test -run Script/foo` to just run `testdata/scripts/foo.txt`
|
||
|
|
|
||
|
|
### Development tips
|
||
|
|
|
||
|
|
To inject code into the syntax tree, don't write `go/ast` nodes by hand; you can
|
||
|
|
generate them by typing Go source into tools such as
|
||
|
|
[astextract](https://lu4p.github.io/astextract/).
|
||
|
|
|
||
|
|
### Benchmarking
|
||
|
|
|
||
|
|
A build benchmark is available, to be able to measure the cost of builing a
|
||
|
|
fairly simple main program. Here is an example of how to use the benchmark with
|
||
|
|
[benchstat](https://golang.org/x/perf/cmd/benchstat):
|
||
|
|
|
||
|
|
# Run the benchmark six times with five iterations each.
|
||
|
|
go test -run=- -bench=. -count=6 -benchtime=5x >old.txt
|
||
|
|
|
||
|
|
# Make some change to the code.
|
||
|
|
git checkout some-optimization
|
||
|
|
|
||
|
|
# Obtain benchmark results once more.
|
||
|
|
go test -run=- -bench=. -count=6 -benchtime=5x >new.txt
|
||
|
|
|
||
|
|
# Obtain the final stats.
|
||
|
|
benchstat old.txt new.txt
|
||
|
|
|
||
|
|
It is very important to run the steps above on a quiet machine. Any background
|
||
|
|
program that could use CPU or I/O should be closed, as it would likely skew the
|
||
|
|
results; this includes browsers, chat apps, and music players.
|
||
|
|
|
||
|
|
A higher `-benchtime` will mean more stable numbers, and a higher `-count` will
|
||
|
|
mean more reliable statistical results, but both increase the overall cost of
|
||
|
|
running the benchmark. The provided example should be a sane default, and each
|
||
|
|
'go test' invocation takes about a minute on a laptop.
|
||
|
|
|
||
|
|
For example, below are the final results for a run where nothing was changed:
|
||
|
|
|
||
|
|
$ benchstat old.txt new.txt
|
||
|
|
name old time/op new time/op delta
|
||
|
|
Build-8 1.63s ± 6% 1.65s ± 6% ~ (p=0.699 n=6+6)
|
||
|
|
|
||
|
|
name old sys-time/op new sys-time/op delta
|
||
|
|
Build-8 1.18s ± 6% 1.22s ± 8% ~ (p=0.310 n=6+6)
|
||
|
|
|
||
|
|
name old user-time/op new user-time/op delta
|
||
|
|
Build-8 9.82s ± 6% 10.01s ± 7% ~ (p=0.485 n=6+6)
|