From ca66978a5aadddf7895b49b44076c574e7e6a0b0 Mon Sep 17 00:00:00 2001 From: Divy Srivastava Date: Sun, 27 Nov 2022 05:54:28 -0800 Subject: feat(ops): fast calls for Wasm (#16776) 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]>, ) { // ... } ``` --- core/examples/wasm.js | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 core/examples/wasm.js (limited to 'core/examples/wasm.js') diff --git a/core/examples/wasm.js b/core/examples/wasm.js new file mode 100644 index 000000000..69e475639 --- /dev/null +++ b/core/examples/wasm.js @@ -0,0 +1,28 @@ +// 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"); +} -- cgit v1.2.3