JSTests/wasm/function-tests/trap-store.js

import Builder from '../Builder.js'
import * as assert from '../assert.js'

const pageSize = 64 * 1024;
const numPages = 10;

{
    const builder = (new Builder())
        .Type().End()
        .Import()
            .Memory("a", "b", {initial: numPages})
        .End()
        .Function().End()
        .Export().Function("foo").End()
        .Code()
            .Function("foo", {params: ["i32", "i32"]})
                .GetLocal(1)
                .GetLocal(0)
                .I32Store(2, 0)
            .End()
        .End();

    const bin = builder.WebAssembly().get();
    const module = new WebAssembly.Module(bin);
    const foo = new WebAssembly.Instance(module, {a: {b: new WebAssembly.Memory({initial: numPages})}}).exports.foo;

    for (let i = 0; i < 10000; i++)
        assert.throws(() => foo(i, numPages * pageSize + 1), WebAssembly.RuntimeError, "Out of bounds memory access");
}