Hywan

#[no_mangle]
pub extern fn sum(x: i32, y: i32) -> i32 {
    x + y
}

Hywan

#[no_mangle]
pub extern fn sum(x: i32, y: i32) -> i32 {
    x + y
}

Hywan

package main

import (
	"fmt"
	wasm "github.com/wasmerio/go-ext-wasm/wasmer"
)

func main() {
	// Reads the WebAssembly module as bytes.
	bytes, _ := wasm.ReadBytes("simple.wasm")

Hywan

extern {
    fn sum(x: i32, y: i32) -> i32;
}

#[no_mangle]
pub extern fn add1(x: i32, y: i32) -> i32 {
    unsafe { sum(x, y) } + 1
}

Hywan

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 (

Hywan

#[no_mangle]
pub extern fn return_hello() -> *const u8 {
    b"Hello, World!\0".as_ptr()
}

Hywan

bytes, _ := wasm.ReadBytes("memory.wasm")
instance, _ := wasm.NewInstance(bytes)
defer instance.Close()

// Calls the `return_hello` exported function.
// This function returns a pointer to a string.
result, _ := instance.Exports["return_hello"]()

// Gets the pointer value as an integer.
pointer := result.ToI32()

Hywan

$ # Build the shared library.
$ just build

$ # Install the extension in the Postgres tree.
$ just install

$ # Activate the extension.
$ echo 'CREATE EXTENSION wasm;' | \
      psql -h $host -d $database

Hywan

#[no_mangle]
pub extern fn sum(x: i32, y: i32) -> i32 {
    x + y
}

Hywan

-- New instance of the `simple.wasm` WebAssembly module.
SELECT wasm_new_instance('/absolute/path/to/simple.wasm', 'ns');

-- Call a WebAssembly exported function!
SELECT ns_sum(1, 2);

--  ns_sum
-- --------
--       3
-- (1 row)