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Bumps [wasmi](https://github.com/paritytech/wasmi) from 0.31.0 to
0.31.2.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/paritytech/wasmi/releases">wasmi's
releases</a>.</em></p>
<blockquote>
<h2>v0.31.1 - 2023-12-01</h2>
<h3>Fixes</h3>
<ul>
<li>Fixed a bug, in the <code>wasmi</code> engine executor, that causes
an out of bounds buffer write when calling or resuming a Wasm function
with a high number of parameters from the host side.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/paritytech/wasmi/blob/master/CHANGELOG.md">wasmi's
changelog</a>.</em></p>
<blockquote>
<h1>Changelog</h1>
<p>All notable changes to this project will be documented in this
file.</p>
<p>The format is loosely based on <a
href="https://keepachangelog.com/en/1.0.0/">Keep a Changelog</a>,
and this project adheres to <a
href="https://semver.org/spec/v2.0.0.html">Semantic Versioning</a>.
Additionally we have an <code>Internal</code> section for changes that
are of interest to developers.</p>
<p>Dates in this file are formattes as <code>YYYY-MM-DD</code>.</p>
<h2>[<code>0.32.0-beta.5</code>] - 2024-01-15</h2>
<p><strong>Note:</strong></p>
<ul>
<li>This is the beta of the upcoming <code>v0.32.0</code> release.
This version is not production ready yet and might contain serious bugs.
Please use this only for experimentation or at your own risk.</li>
<li>Performance tests indicated that the new register-machine bytecode
based
Wasmi engine performance is very sensitive to hardware or OS specifics
which may lead to very different performance characteristics.
<ul>
<li>We are working on fixing this until the stable release.</li>
<li>Measurements concluded that execution performance can be equal or
sometimes
even surpass Wasm3 execution performance.</li>
</ul>
</li>
</ul>
<h3>Added</h3>
<ul>
<li>Added a new execution engine based on register-machine bytecode. (<a
href="https://redirect.github.com/paritytech/wasmi/pull/729">paritytech/wasmi#729</a>)
<ul>
<li>The register-machine Wasmi <code>Engine</code> executes roughly
80-100% faster and
compiles roughly 30% slower according to benchmarks conducted so
far.</li>
</ul>
</li>
<li>Added <code>Module::new_unchecked</code> API. (<a
href="https://redirect.github.com/paritytech/wasmi/pull/829">paritytech/wasmi#829</a>)
<ul>
<li>This allows to compile a Wasm module without Wasm validation which
can be useful
when users know that their inputs are valid Wasm binaries.</li>
<li>This improves Wasm compilation performance for faster startup times
by roughly 10-20%.</li>
</ul>
</li>
<li>Added Wasm compilation modes. (<a
href="https://redirect.github.com/paritytech/wasmi/pull/844">paritytech/wasmi#844</a>)
<ul>
<li>When using <code>Module::new</code> Wasmi eagerly compiles Wasm
bytecode into Wasmi bytecode
which is optimized for efficient execution. However, this compilation
can become very
costly especially for large Wasm binaries.</li>
<li>The solution to this problem is to introduce new compilation modes,
namely:
<ul>
<li><code>CompilationMode::Eager</code>: Eager compilation, what Wasmi
did so far. (default)</li>
<li><code>CompilationMode::LazyTranslation</code>: Eager Wasm validation
and lazy Wasm translation.</li>
<li><code>CompilationMode::Lazy</code>: Lazy Wasm validation and
translation.</li>
</ul>
</li>
<li>Benchmarks concluded that
<ul>
<li><code>CompilationMode::LazyTanslation</code>: Usually improves
startup performance by a factor of 2 to 3.</li>
<li><code>CompilationMode::Lazy</code>: Usually improves startup
performance by a factor of up to 27.</li>
</ul>
</li>
<li>Note that <code>CompilationMode::Lazy</code> can lead to partially
validated Wasm modules
which can introduce non-determinism when using different Wasm
implementations.
Therefore users should know what they are doing when using
<code>CompilationMode::Lazy</code> if this is a concern.</li>
<li>Enable lazy Wasm compilation with:
<pre lang="rust"><code>let mut config = wasmi::Config::default();
</code></pre>
</li>
</ul>
</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/paritytech/wasmi/commit/0218dfc74b4c4a83261d46d90ac83fb513fd6b3f"><code>0218dfc</code></a>
Fix <code>InstanceCache</code> bug (<a
href="https://redirect.github.com/paritytech/wasmi/issues/904">#904</a>)</li>
<li><a
href="https://github.com/paritytech/wasmi/commit/3fd0cc2b2d7b7a55142e6a6cffffbe4212ed00ae"><code>3fd0cc2</code></a>
Bump <code>wasmi_arena</code> version (<a
href="https://redirect.github.com/paritytech/wasmi/issues/903">#903</a>)</li>
<li><a
href="https://github.com/paritytech/wasmi/commit/86c874029eba5067f4ecd01bc3c4f6dacab5a16e"><code>86c8740</code></a>
Fix <code>Sync</code> impl bug in <code>wasmi_arena</code> crate (<a
href="https://redirect.github.com/paritytech/wasmi/issues/902">#902</a>)</li>
<li><a
href="https://github.com/paritytech/wasmi/commit/27def282b06613e770d0ab96de88b9909973a12b"><code>27def28</code></a>
Bump actions/cache from 3 to 4 (<a
href="https://redirect.github.com/paritytech/wasmi/issues/900">#900</a>)</li>
<li><a
href="https://github.com/paritytech/wasmi/commit/59f9acc4776c09a35c6d563609de6818e9b65084"><code>59f9acc</code></a>
Fix typos (<a
href="https://redirect.github.com/paritytech/wasmi/issues/899">#899</a>)</li>
<li><a
href="https://github.com/paritytech/wasmi/commit/4c06acd816ccde6f45f9cc16aac4e18d36066054"><code>4c06acd</code></a>
Update and improve Wasmi's readme (<a
href="https://redirect.github.com/paritytech/wasmi/issues/898">#898</a>)</li>
<li><a
href="https://github.com/paritytech/wasmi/commit/2354a20ecc5e4209af2ba7458a8c383789ad8b4f"><code>2354a20</code></a>
Prepare release for Wasmi <code>v0.32.0 beta.5</code> (<a
href="https://redirect.github.com/paritytech/wasmi/issues/893">#893</a>)</li>
<li><a
href="https://github.com/paritytech/wasmi/commit/a4dc251bf066c362a2fc6acf00da924659894c6d"><code>a4dc251</code></a>
Fix heap buffer overflow due to Wasmi codegen bug (<a
href="https://redirect.github.com/paritytech/wasmi/issues/892">#892</a>)</li>
<li><a
href="https://github.com/paritytech/wasmi/commit/e60da4979009370cb1149b29dbb612886854efa9"><code>e60da49</code></a>
Add CI test job using LLVM's Address Sanitizer (<a
href="https://redirect.github.com/paritytech/wasmi/issues/891">#891</a>)</li>
<li><a
href="https://github.com/paritytech/wasmi/commit/28c770ac9623d78ce10c67d9bec013e0d3a43bcb"><code>28c770a</code></a>
Prepare release for Wasmi <code>v0.32.0-beta.4</code> (<a
href="https://redirect.github.com/paritytech/wasmi/issues/889">#889</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/paritytech/wasmi/compare/v0.31.0...v0.31.2">compare
view</a></li>
</ul>
</details>
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41db45a2

NOTE: We have recently made significant changes to our repository structure. In order to streamline our development process and foster better contributions, we have merged three separate repositories Cumulus, Substrate and Polkadot into this repository. Read more about the changes here.

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The Polkadot SDK repository provides all the resources needed to start building on the Polkadot network, a multi-chain blockchain platform that enables different blockchains to interoperate and share information in a secure and scalable way. The Polkadot SDK comprises three main pieces of software:

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Implementation of a node for the https://polkadot.network in Rust, using the Substrate framework. This directory currently contains runtimes for the Polkadot, Kusama, Westend, and Rococo networks. In the future, these will be relocated to the runtimes repository.

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Substrate is the primary blockchain SDK used by developers to create the parachains that make up the Polkadot network. Additionally, it allows for the development of self-sovereign blockchains that operate completely independently of Polkadot.

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Cumulus is a set of tools for writing Substrate-based Polkadot parachains.

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[!NOTE]
Our release process is still Work-In-Progress and may not yet reflect the aspired outline here.

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