Crate sc_executor_wasmtime

Defines a WasmRuntime that uses the Wasmtime JIT to execute.

You can choose a profiling strategy at runtime with environment variable WASMTIME_PROFILING_STRATEGY:

WASMTIME_PROFILING_STRATEGY	Effect
undefined	No profiling
"jitdump"	jitdump profiling
other value	No profiling (warning)

Structs

Config

DeterministicStackLimit

Knobs for deterministic stack height limiting.

RuntimeBlob

A program blob containing a Substrate runtime.

Semantics

WasmtimeRuntime

A WasmModule implementation using wasmtime to compile the runtime module to machine code and execute the compiled code.

Enums

HeapAllocStrategy

Defines the heap pages allocation strategy the wasm runtime should use.

InstantiationStrategy

The instantiation strategy to use for the WASM executor.

Traits

WasmModule

A trait that defines an abstract WASM runtime module.

Functions

create_runtime

Create a new WasmtimeRuntime given the code. This function performs translation from Wasm to machine code, which can be computationally heavy.

create_runtime_from_artifact^⚠

The same as create_runtime but takes a path to a precompiled artifact, which makes this function considerably faster than create_runtime.

create_runtime_from_artifact_bytes^⚠

The same as create_runtime but takes the bytes of a precompiled artifact, which makes this function considerably faster than create_runtime, but slower than the more optimized create_runtime_from_artifact. This is especially slow on non-Linux Unix systems. Useful in very niche cases.

prepare_runtime_artifact

Takes a RuntimeBlob and precompiles it returning the serialized result of compilation. It can then be used for calling create_runtime avoiding long compilation times.