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Use SipHasher rather than SHA-512 for ISLE manifest.

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Fixes #3609. It turns out that `sha2` is a nontrivial dependency for
Cranelift in many contexts, partly because it pulls in a number of other
crates as well.

One option is to remove the hash check under certain circumstances, as
implemented in #3616. However, this is undesirable for other reasons:
having different dependency options in Wasmtime in particular for
crates.io vs. local builds is not really possible, and so either we
still have the higher build cost in Wasmtime, or we turn off the checks
by default, which goes against the original intent of ensuring developer
safety (no mysterious stale-source bugs).

This PR uses `SipHash` instead, which is built into the standard
library. `SipHash` is deprecated, but it's fixed and deterministic
(across runs and across Rust versions), which is what we need, unlike
the suggested replacement `std::collections::hash_map::DefaultHasher`.
The result is only 64 bits, and is not cryptographically secure, but we
never needed that; we just need a simple check to indicate when we
forget a `rebuild-isle`.
This commit is contained in:
Chris Fallin
2021-12-17 11:58:06 -08:00
parent e94ebc2263
commit 5233175b06
5 changed files with 33 additions and 15 deletions
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8
cranelift/codegen/src/isa/aarch64/lower/isle/generated_code.manifest
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@@ -1,4 +1,4 @@
src/clif.isle be1359b4b6b153f378517c1dd95cd80f4a6bed0c7b86eaba11c088fd71b7bfe80a3c868ace245b2da0bfbbd6ded262ea9576c8e0eeacbf89d03c34a17a709602
src/prelude.isle 15c8dd937171bd0f619179e219422d43af0eb0ef9a6e88f23b2aa55776712e27342309dd3a4441876b2dfec7f16ce7fe13b3a926ace89b25cfc9577e7b1d1578
src/isa/aarch64/inst.isle a6921329a85a252b8059657056ee0c4477304dff461bd58c39133a2870666b23a34c911be55e25e7887074cb54b640ff09998730af09b3c1ba792f434309af24
src/isa/aarch64/lower.isle 3cc84f8e3907818da7e0cbb4afe7f269da7090f3d504c74ecf02ef57463b281f4a320e52656d9397720ec8e4af98c1ecea05c4ffbe3f0c4126af4ed95d2734cc
src/clif.isle f176ef3bba99365
src/prelude.isle babc931e5dc5b4cf
src/isa/aarch64/inst.isle abbd648f4a0b479a
src/isa/aarch64/lower.isle c46d0692df0a9c0d