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https://github.com/denoland/deno.git
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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.
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// asc wasm.ts --exportStart --initialMemory 6400 -O -o wasm.wasm
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// deno-fmt-ignore
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const bytes = new Uint8Array([
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0, 97, 115, 109, 1, 0, 0, 0, 1, 4, 1, 96, 0, 0, 2,
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15, 1, 3, 111, 112, 115, 7, 111, 112, 95, 119, 97, 115, 109, 0,
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0, 3, 3, 2, 0, 0, 5, 4, 1, 0, 128, 50, 7, 36, 4,
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7, 111, 112, 95, 119, 97, 115, 109, 0, 0, 4, 99, 97, 108, 108,
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0, 1, 6, 109, 101, 109, 111, 114, 121, 2, 0, 6, 95, 115, 116,
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97, 114, 116, 0, 2, 10, 10, 2, 4, 0, 16, 0, 11, 3, 0,
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1, 11
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]);
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const { ops } = Deno.core;
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const module = new WebAssembly.Module(bytes);
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const instance = new WebAssembly.Instance(module, { ops });
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ops.op_set_wasm_mem(instance.exports.memory);
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instance.exports.call();
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const memory = instance.exports.memory;
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const view = new Uint8Array(memory.buffer);
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if (view[0] !== 69) {
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throw new Error("Expected first byte to be 69");
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}
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