How to Resolve Execution Errors When Compiling Go Code to WASM?

Golang to WASM Compilation: Troubleshooting Execution Errors

When compiling Golang code to WASM using GOOS=js GOARCH=wasm go build -o main.wasm, you may encounter errors when executing the compiled code using wasmtime or wasm3.

Error with wasmtime: failed to instantiate "main.wasm"

Cause:

This error indicates that the main.wasm file contains undefined imports. Specifically, the go::debug import is missing.

Solution:

The main.wasm file generated by the Golang compiler is meant to be used with the wasm_exec.js shim. When executed with wasmtime, you need to use node wasm_exec.js main.wasm instead.

Error with wasm3: function lookup failed ('_start')

Cause:

This error occurs because the wasm3 tool cannot find the _start function in the main.wasm file.

Solution:

TinyGo offers WASI support, which allows you to compile Golang code into a standalone WASM binary that can be executed directly by wasm3. Compile your code using tinygo build -target=wasi -o main.wasm main.go.

Bleeding-Edge Solution for Golang

Cause:

The latest unreleased versions of Golang include experimental support for WASM outside the browser.

Solution:

1. Build Golang from sources using go install golang.org/dl/gotip@latest; gotip download.
2. Compile your code using GOOS=wasip1 GOARCH=wasm gotip build -o main.wasm.
3. Run your code with wasmtime, which supports WASI.

Note: This solution may require a powerful computer for compilation.

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