mirror of
https://github.com/denoland/deno.git
synced 2024-11-27 16:10:57 -05:00
ca66978a5a
This PR introduces Wasm ops. These calls are optimized for entry from
Wasm land.
The `#[op(wasm)]` attribute is opt-in.
Last parameter `Option<&mut [u8]>` is the memory slice of the Wasm
module *when entered from a Fast API call*. Otherwise, the user is
expected to implement logic to obtain the memory if `None`
```rust
#[op(wasm)]
pub fn op_args_get(
offset: i32,
buffer_offset: i32,
memory: Option<&mut [u8]>,
) {
// ...
}
```
28 lines
1 KiB
JavaScript
28 lines
1 KiB
JavaScript
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
|
|
|
|
// asc wasm.ts --exportStart --initialMemory 6400 -O -o wasm.wasm
|
|
// deno-fmt-ignore
|
|
const bytes = new Uint8Array([
|
|
0, 97, 115, 109, 1, 0, 0, 0, 1, 4, 1, 96, 0, 0, 2,
|
|
15, 1, 3, 111, 112, 115, 7, 111, 112, 95, 119, 97, 115, 109, 0,
|
|
0, 3, 3, 2, 0, 0, 5, 4, 1, 0, 128, 50, 7, 36, 4,
|
|
7, 111, 112, 95, 119, 97, 115, 109, 0, 0, 4, 99, 97, 108, 108,
|
|
0, 1, 6, 109, 101, 109, 111, 114, 121, 2, 0, 6, 95, 115, 116,
|
|
97, 114, 116, 0, 2, 10, 10, 2, 4, 0, 16, 0, 11, 3, 0,
|
|
1, 11
|
|
]);
|
|
|
|
const { ops } = Deno.core;
|
|
|
|
const module = new WebAssembly.Module(bytes);
|
|
const instance = new WebAssembly.Instance(module, { ops });
|
|
ops.op_set_wasm_mem(instance.exports.memory);
|
|
|
|
instance.exports.call();
|
|
|
|
const memory = instance.exports.memory;
|
|
const view = new Uint8Array(memory.buffer);
|
|
|
|
if (view[0] !== 69) {
|
|
throw new Error("Expected first byte to be 69");
|
|
}
|