1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
const PAGE_SIZE = Math.pow(2, 16);
const I32_SIZE = 4;
it("should load from the given location", () => {
return WebAssembly.instantiate(wasmmodule).then(m => {
const i32 = new Uint32Array(m.instance.exports.memory.buffer);
// store a number
i32[12 / I32_SIZE] = 45;
assert.equal(m.instance.exports.load(12), 45);
});
});
it("should throw for memory out of bounds", () => {
return WebAssembly.instantiate(wasmmodule).then(m => {
const i32 = new Uint32Array(m.instance.exports.memory.buffer);
// upper bound
i32[PAGE_SIZE / I32_SIZE - 1] = 45;
assert.equal(m.instance.exports.load(PAGE_SIZE - I32_SIZE), 45);
assert.throws(() => {
// upper bound exceeded
m.instance.exports.load(PAGE_SIZE + 4);
}, "memory access out of bounds");
});
});
it("should support offsets", () => {
return WebAssembly.instantiate(wasmmodule).then(m => {
const i32 = new Uint32Array(m.instance.exports.memory.buffer);
// load a number with an offset
const offset = 4;
i32[(4 + offset) / I32_SIZE - 1] = 45;
assert.equal(m.instance.exports.load_with_offset(4), 45);
});
});
|
