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[fuzz] Configure the differential target #4773

Merged
merged 5 commits into from
Aug 24, 2022
Merged

[fuzz] Configure the differential target #4773

merged 5 commits into from
Aug 24, 2022

Commits on Aug 24, 2022

  1. [fuzz] Configure the differential target 

    This change is a follow-on from bytecodealliance#4515 to add the ability to configure
the `differential` fuzz target by limiting which engines and modules are
used for fuzzing. This is incredibly useful when troubleshooting, e.g.,
when an engine is more prone to failure, we can target that engine
exclusively. The effect of this configuration is visible in the
statistics now printed out from bytecodealliance#4739.

Engines are configured using the `ALLOWED_ENGINES` environment variable.
We can either subtract from the set of allowed engines (e.g.,
`ALLOWED_ENGINES=-v8`) or build up a set of allowed engines (e.g.,
`ALLOWED_ENGINES=wasmi,spec`), but not both at the same time.
`ALLOWED_ENGINES` only configures the left-hand side engine; the
right-hand side is always Wasmtime. When omitted, `ALLOWED_ENGINES`
defaults to [`wasmtime`, `wasmi`, `spec`, `v8`].

The generated WebAssembly modules are configured using
`ALLOWED_MODULES`. This environment variables works the same as above
but the available options are: [`wasm-smith`, `single-inst`].
    @abrown
    abrown committed Aug 24, 2022
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  2. review: limit code in unsafe blocks

    @abrown
    abrown committed Aug 24, 2022
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  3. review: simplify choosing modules

    @abrown
    abrown committed Aug 24, 2022
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  4. review: use &str in signatures

    @abrown
    abrown committed Aug 24, 2022
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  5. review: simplify range to usize

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    abrown committed Aug 24, 2022
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