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Go Wasm example, import.go
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package main | |
// // 1️⃣ Declare the `sum` function signature (see cgo). | |
// | |
// #include <stdlib.h> | |
// | |
// extern int32_t sum(void *context, int32_t x, int32_t y); | |
import "C" | |
import ( | |
"fmt" | |
wasm "github.com/wasmerio/go-ext-wasm/wasmer" | |
"unsafe" | |
) | |
// 2️⃣ Write the implementation of the `sum` function, and export it (for cgo). | |
//export sum | |
func sum(context unsafe.Pointer, x int32, y int32) int32 { | |
return x + y | |
} | |
func main() { | |
// Reads the WebAssembly module as bytes. | |
bytes, _ := wasm.ReadBytes("import.wasm") | |
// 3️⃣ Declares the imported functions for WebAssembly. | |
imports, _ := wasm.NewImports().Append("sum", sum, C.sum) | |
// 4️⃣ Instantiates the WebAssembly module with imports. | |
instance, _ := wasm.NewInstanceWithImports(bytes, imports) | |
// Close the WebAssembly instance later. | |
defer instance.Close() | |
// Gets the `add1` exported function from the WebAssembly instance. | |
add1 := instance.Exports["add1"] | |
// Calls that exported function. | |
result, _ := add1(1, 2) | |
fmt.Println(result) | |
// add1(1, 2) | |
// = sum(1 + 2) + 1 | |
// = 1 + 2 + 1 | |
// = 4 | |
// QED | |
} |
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