Is it possible to have JITless with WASM on?

[Wx Gopher]

Hi,

We are trying to enable jitless for our app, but some features rely on WASM and are not functional after jitless is enabled.

After a bit research we found (in v8.cc):

// Do not expose wasm in jitless mode.

//

// Even in interpreter-only mode, wasm currently still creates executable

// memory at runtime. Unexpose wasm until this changes.

// The correctness fuzzers are a special case: many of their test cases are

// built by fetching a random property from the the global object, and thus

// the global object layout must not change between configs. That is why we

// continue exposing wasm on correctness fuzzers even in jitless mode.

// TODO(jgruber): Remove this once / if wasm can run without executable

// memory.

#if V8_ENABLE_WEBASSEMBLY

if (v8_flags.jitless && !v8_flags.correctness_fuzzer_suppressions) {

DISABLE_FLAG(expose_wasm);

}

#endif

https://source.chromium.org/chromium/chromium/src/+/main:v8/src/init/v8.cc;l=205;bpv=1;bpt=0

Is this going to get resolved somehow? Or is there any suggestion for running WASM with jitless enabled?

Cheers,

[Dave Tapuska]

V8 does not have an interpreter for WASM in the source repository. Microsoft is in the process of upstreaming their WASM interpreter (called drumbrake). I'm not sure how complete it is or when it will be enabled by default, or if actually does run WASM in jitless mode (since the patch set doesn't actually touch this conditional either). Perhaps someone from Microsoft can chime in.

dave.

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