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Instead of generating Go files with descriptions
serialize them as gob and compress with flate.
This significantly reduces build time, go vet time,
and solves scalability problems with some static analysis tools.
Reference times (all after rm -rf ~/.cache/go-build) before:
TIME="%e %P %M" time go install ./syz-manager
48.29 577% 4824820
TIME="%e %P %M" time go test -c ./prog
56.28 380% 6973292
After:
TIME="%e %P %M" time go install ./syz-manager
22.81 865% 859788
TIME="%e %P %M" time go test -c ./prog
12.74 565% 267760
syz-manager size before/after: 194712597 -> 83418407
-57% even provided we now embed all descriptions
instead of just a single arch.
Deflate/decoding time for a single Linux arch is ~330ms.
Fixes #5542
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It was missing and we forgot to import it in sys.
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Checking in the generated descriptions files makes few things simpler,
but causes pain for pull requests: (1) PRs that touch descriptions
_always_ conflict, (2) PRs are large and harder to review,
(3) people sometimes forget to add auto-generated files.
The proposed way does not require us to hardcode lots of dependencies
in the Makefile (which is nice) and seem to work.
Let's see how it works.
The main contributor-visible consequence is that the auto-generated
files do not need to be checked-in now.
Credit for figuring the Makefile magic goes to @melver.
Fixes #1291
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Trusty is a set of software components supporting
a Trusted Execution Environment (TEE) on mobile devices.
https://source.android.com/security/trusty
Add syscall descriptions and some boilerplate.
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