Upgrade to Wasmer Reborn

[webmaster128]

Before hitting 1.0, we want to migrate to the new version of Wasmer, which is currently in private beta.

I tried migrating straight to the new API, which turned out be almost impossible since I did not see any way to do that gradually. There is a compatibility wrapper around the new API, which turns out to be very promising and brings us to almost compiling.

Right now, we're blocked by the missing ability to get a memory given a Ctx.

• dependencies compile
• get a memory given a Ctx (Ctx::memory missing in compatibility wrapper wasmerio/wasmer#1535)
• cosmwasm-vm compiles
• add metering middleware (https://github.com/wasmerio/wasmer-reborn/pull/129)
• add deterministic middleware
• cosmwasm-vm test pass
• remove do_scan and do_next imports when the iterator feature is not enabled
• all contracts/integration tests compile
• all integration tests pass

[webmaster128]

Made some good progress here the last 2 days. (cd packages/vm && cargo +nightly check) now passes (test do not yet compile). However, I run in big trouble with the iterator feature ((cd packages/vm && cargo +nightly check --features iterator)) because of the lifetime of iterators (#335 (comment)). We might be able to do further progress by storing the context data as a void pointer like we did before, but now it becomes clear how unsafe that is.

[syrusakbary]

Note: Wasmer 1.0 doesn't require +nightly any longer for singlepass (you can use stable since Rust 1.45+) :)

[yun-yeo]

Made many updates for [email protected] . now yet released but can prepare update :)

Also they have update on int signal catch here wasmerio/wasmer#1552

---

seems after adopting v0.17.1 (int signal removed), test not finished. maybe due to infinite loop test?

[webmaster128]

seems after adopting v0.17.1 (int signal removed), test not finished. maybe due to infinite loop test?

CosmWasm never used Wasmer 0.17.1 due to issues we had with it. We will migrate from 0.17.0 to 1.0.

[webmaster128]

The original description is outdated. Once wasmerio/wasmer#1856 is closed, we can merge #504. Metering is disabled temporarily and will be reactivated in #642 before CosmWasm 0.13.