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Description
Problem description:
I used tinygo to compile a wasm file, and an error occurred when I used wasmer-go to read, compile and execute the file again.
Steps to reproduce
main.go
package main
import (
"fmt"
"os"
"github.com/wasmerio/wasmer-go/wasmer"
)
func main() {
engine := wasmer.NewEngine()
store := wasmer.NewStore(engine)
wasmBytes, err := os.ReadFile("test.wasm")
if err != nil {
fmt.Println("Error reading Wasm file:", err)
return
}
module, err := wasmer.NewModule(store, wasmBytes)
if err != nil {
fmt.Println("Error compiling Wasm module:", err)
return
}
instance, err := wasmer.NewInstance(module, nil)
if err != nil {
fmt.Println("Error instantiating Wasm module:", err)
return
}
sumFunc, err := instance.Exports.GetFunction("sum")
if err != nil {
fmt.Println("Error getting function from Wasm module:", err)
return
}
result, err := sumFunc(10, 20)
if err != nil {
fmt.Println("Error calling function from Wasm module:", err)
return
}
fmt.Println("Result:", result)
}wasm.go
package main
import (
"syscall/js"
)
func sum(this js.Value, args []js.Value) interface{} {
if len(args) != 2 {
return "Invalid number of arguments. Expected 2."
}
num1 := args[0].Float()
num2 := args[1].Float()
result := num1 + num2
return result
}
func main() {
js.Global().Set("sum", js.FuncOf(sum))
done := make(chan struct{}, 0)
<-done
}Expected behavior
The sum function exists and it should return the correct result.
Actual behavior
~/study/wasm tinygo build -o test.wasm -target wasm ./wasm.go
~/study/wasm go run main.go
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x10de47342]
goroutine 1 [running]:
github.com/wasmerio/wasmer-go/wasmer.(*ImportObject).intoInner(0x0, 0xc0000ca000)
/Users/wanghua/go/pkg/mod/github.com/wasmerio/[email protected]/wasmer/import_object.go:36 +0x142
github.com/wasmerio/wasmer-go/wasmer.NewInstance(0xc0000ca000, 0x0)
/Users/wanghua/go/pkg/mod/github.com/wasmerio/[email protected]/wasmer/instance.go:31 +0x45
main.main()
/Users/wanghua/study/wasm/main.go:30 +0x149
exit status 2JavaScript
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Go WebAssembly Calculator</title>
<script src="./wasm_exec.js"></script>
<script>
window.onload = function () {
const go = new Go();
WebAssembly.instantiateStreaming(
fetch("./test.wasm"),
go.importObject
).then((res) => {
go.run(res.instance);
});
};
function calculate() {
const num1 = parseFloat(document.getElementById("num1").value);
const num2 = parseFloat(document.getElementById("num2").value);
console.log(window);
const result = window.sum(num1, num2);
document.getElementById("result").innerHTML = result;
return new Promise(() => {});
}
</script>
</head>
<body>
<h1>Simple Calculator</h1>
<input type="number" id="num1" value="1" placeholder="Number 1" /> <br />
<input type="number" id="num2" value="2" placeholder="Number 2" /><br />
<button onclick="calculate()">Calculate</button>
<h2>Result: <span id="result"></span></h2>
</body>
</html>Output:
Uncaught TypeError: window.sum is not a function at calculate (index.html:23:31) at HTMLButtonElement.onclick(index.html:36:35)
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