├── .github └── workflows │ └── main.yml ├── .gitignore ├── LICENSE ├── examples ├── calculator.wasm ├── index.html ├── node-example.js ├── using_calculator.wasm ├── using_calculator_async.wasm ├── wasi-example.js └── wasi_hello.wasm ├── package-lock.json ├── package.json ├── readme.md ├── serve.js ├── src ├── index.ts ├── linker.ts └── store.ts ├── tests ├── linker.ts ├── store.ts └── wat.ts ├── tsconfig.json └── webpack.config.js /.github/workflows/main.yml: -------------------------------------------------------------------------------- 1 | name: Build and Test 2 | 3 | on: [push, pull_request] 4 | 5 | jobs: 6 | build: 7 | runs-on: ubuntu-latest 8 | 9 | steps: 10 | - uses: actions/checkout@v2 11 | - name: Build and Test 12 | run: | 13 | npm install 14 | npm run build 15 | npm run test 16 | npm run examples 17 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | target 2 | Cargo.lock 3 | node_modules/ 4 | dist/ -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) Microsoft Corporation. All rights reserved. 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE 22 | -------------------------------------------------------------------------------- /examples/calculator.wasm: -------------------------------------------------------------------------------- 1 | asm`/addmultiplysubtractdividememory 2 | ! j  l  k  m \name"addmultiplysubtractdivide1lhsrhslhsrhslhsrhslhsrhs -------------------------------------------------------------------------------- /examples/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 |
4 | 5 | 9 |
10 | 11 | 76 | 77 | 78 | -------------------------------------------------------------------------------- /examples/node-example.js: -------------------------------------------------------------------------------- 1 | const { Linker } = require("../dist/src/index"); 2 | const { parseText } = require("binaryen"); 3 | const assert = require("assert"); 4 | 5 | const usingAdd = ` 6 | (module 7 | (import "calculator" "add" (func $calc_add (param i32 i32) (result i32))) 8 | 9 | (memory 1 1) 10 | (export "memory" (memory 0)) 11 | (export "add" (func $add)) 12 | 13 | (func $add (param i32) (param i32) (result i32) 14 | (return 15 | (call $calc_add 16 | (local.get 0) 17 | (local.get 1) 18 | ) 19 | ) 20 | ) 21 | ) 22 | `; 23 | 24 | const add = ` 25 | (module 26 | (memory 1 1) 27 | (export "memory" (memory 0)) 28 | (export "add" (func $add)) 29 | 30 | (func $add (param i32) (param i32) (result i32) 31 | (return 32 | (i32.add 33 | (local.get 0) 34 | (local.get 1) 35 | ) 36 | ) 37 | ) 38 | ) 39 | `; 40 | 41 | const usingAddWithAlias = ` 42 | (module 43 | (import "calculator1" "add" (func $calc_add1 (param i32 i32) (result i32))) 44 | (import "calculator2" "add" (func $calc_add2 (param i32 i32) (result i32))) 45 | 46 | (memory 1 1) 47 | (export "memory" (memory 0)) 48 | 49 | (export "add1" (func $add1)) 50 | (export "add2" (func $add2)) 51 | 52 | (func $add1 (param i32) (param i32) (result i32) 53 | (return 54 | (call $calc_add1 55 | (local.get 0) 56 | (local.get 1) 57 | ) 58 | ) 59 | ) 60 | 61 | (func $add2 (param i32) (param i32) (result i32) 62 | (return 63 | (call $calc_add2 64 | (local.get 0) 65 | (local.get 1) 66 | ) 67 | ) 68 | ) 69 | ) 70 | `; 71 | 72 | (async () => { 73 | // example of using linker.define 74 | { 75 | var linker = new Linker(); 76 | 77 | // the "usingAdd" module above imports calculator.add 78 | // we define it and provide a JS implementation, then 79 | // instantiate it. 80 | linker.define("calculator", "add", (a, b) => a + b); 81 | var calc = await linker.instantiate(parseText(usingAdd).emitBinary()); 82 | 83 | assert.equal(calc.instance.exports.add(1, 2), 3); 84 | } 85 | 86 | // example of using linker.module 87 | { 88 | var linker = new Linker(); 89 | 90 | // the "usingAdd" module above imports calculator.add 91 | // we link a module that we know exports the functionality 92 | // required, then instantiate the module that uses it. 93 | 94 | await linker.module( 95 | "calculator", 96 | new WebAssembly.Module(parseText(add).emitBinary()) 97 | ); 98 | var calc = await linker.instantiate(parseText(usingAdd).emitBinary()); 99 | assert.equal(calc.instance.exports.add(1, 41), 42); 100 | } 101 | 102 | // example of using linker.instance 103 | { 104 | var linker = new Linker(); 105 | var depsInstance = await WebAssembly.instantiate( 106 | new WebAssembly.Module(parseText(add).emitBinary()) 107 | ); 108 | linker.instance("calculator", depsInstance); 109 | var calc = await linker.instantiate(parseText(usingAdd).emitBinary()); 110 | 111 | assert.equal(42, calc.instance.exports.add(1, 41), 42); 112 | } 113 | 114 | // example of using linker.alias 115 | { 116 | var linker = new Linker(); 117 | // we first define the module that implements `add` as `calculator1` 118 | await linker.module( 119 | "calculator1", 120 | new WebAssembly.Module(parseText(add).emitBinary()) 121 | ); 122 | // we alias `calculator1` as `calculator2` 123 | linker.alias("calculator1", "calculator2"); 124 | var calc = await linker.instantiate( 125 | parseText(usingAddWithAlias).emitBinary() 126 | ); 127 | 128 | assert.equal(calc.instance.exports.add1(1, 99), 100); 129 | assert.equal(calc.instance.exports.add2(2, 99), 101); 130 | } 131 | 132 | // example of using conventional import objects 133 | { 134 | let linker = new Linker(); 135 | var importObject = { 136 | calculator1: { 137 | add: (a, b) => a + b, 138 | }, 139 | calculator2: { 140 | add: (a, b) => a + b, 141 | }, 142 | }; 143 | 144 | linker.imports(importObject); 145 | var calc = await linker.instantiate( 146 | parseText(usingAddWithAlias).emitBinary() 147 | ); 148 | 149 | assert.equal(calc.instance.exports.add1(1, 99), 100); 150 | assert.equal(calc.instance.exports.add2(2, 99), 101); 151 | } 152 | 153 | // example of defining an asynchronous import, 154 | // made possible with Binaryen and asyncify-wasm 155 | { 156 | var useAsyncify = true; 157 | var linker = new Linker(useAsyncify); 158 | 159 | // notice how we define an asynchronous import, which 160 | // will wait for 1.5s before returning the result 161 | linker.define("calculator", "add", async (a, b) => { 162 | await sleep(1500); 163 | return a + b; 164 | }); 165 | 166 | let bytes = parseText(usingAdd); 167 | 168 | // we perform the asyncify compiler pass from Binaryen 169 | bytes.runPasses(["asyncify"]); 170 | var calc = await linker.instantiate(bytes.emitBinary()); 171 | 172 | assert.equal(await calc.instance.exports.add(1, 2), 3); 173 | } 174 | })(); 175 | 176 | async function sleep(ms) { 177 | return new Promise((resolve) => { 178 | setTimeout(resolve, ms); 179 | }); 180 | } 181 | -------------------------------------------------------------------------------- /examples/using_calculator.wasm: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/deislabs/wasm-linker-js/0ab83e04387980c8b6a932452d56cf8ca24d11d0/examples/using_calculator.wasm -------------------------------------------------------------------------------- /examples/using_calculator_async.wasm: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/deislabs/wasm-linker-js/0ab83e04387980c8b6a932452d56cf8ca24d11d0/examples/using_calculator_async.wasm -------------------------------------------------------------------------------- /examples/wasi-example.js: -------------------------------------------------------------------------------- 1 | "use strict"; 2 | const { WASI } = require("wasi"); 3 | const { Linker } = require("../dist/src/index"); 4 | const fs = require("fs"); 5 | const wasi = new WASI(); 6 | 7 | (async () => { 8 | var linker = new Linker(); 9 | linker.imports({ wasi_snapshot_preview1: wasi.wasiImport }); 10 | 11 | const wasi_hello = await WebAssembly.compile( 12 | fs.readFileSync("./wasi_hello.wasm") 13 | ); 14 | 15 | var instance = await linker.instantiate(wasi_hello); 16 | wasi.start(instance); 17 | })(); 18 | -------------------------------------------------------------------------------- /examples/wasi_hello.wasm: -------------------------------------------------------------------------------- 1 | asm ``#wasi_snapshot_preview1fd_writememory_start 2 | AA6AA 6AAAA A hello world 3 | namefd_writemain -------------------------------------------------------------------------------- /package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "@deislabs/wasm-linker-js", 3 | "version": "0.2.1", 4 | "lockfileVersion": 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-------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "@deislabs/wasm-linker-js", 3 | "version": "0.2.1", 4 | "description": "A simple WebAssembly linker", 5 | "keywords": [ 6 | "wasm", 7 | "webassembly" 8 | ], 9 | "author": { 10 | "name": "The DeisLabs team at Microsoft" 11 | }, 12 | "homepage": "https://github.com/deislabs/wasm-linker-js", 13 | "repository": { 14 | "type": "git", 15 | "url": "https://github.com/deislabs/wasm-linker-js.git" 16 | }, 17 | "bugs": { 18 | "url": "https://github.com/deislabs/wasm-linker-js/issues" 19 | }, 20 | "main": "dist/src/index.js", 21 | "types": "dist/src/index.d.ts", 22 | "directories": { 23 | "lib": "lib" 24 | }, 25 | "files": [ 26 | "dist/src/*", 27 | "dist/wasm-linker.js" 28 | ], 29 | "dependencies": { 30 | "asyncify-wasm": "^1.1.2" 31 | }, 32 | "devDependencies": { 33 | "@types/chai": "^4.0.1", 34 | "@types/mocha": "^8.2.0", 35 | "@types/node": "^14.14.14", 36 | "@types/node-fetch": "^2.5.7", 37 | "@types/uuid": "^8.3.0", 38 | "binaryen": "^98.0.0", 39 | "chai": "^4.1.0", 40 | "express": "4.17.1", 41 | "mocha": "^8.2.1", 42 | "ssri": "^8.0.1", 43 | "ts-loader": "^9.2.3", 44 | "ts-node": "^9.1.1", 45 | "typescript": "^3.8.3", 46 | "webpack": "^5.38.1", 47 | "webpack-cli": "^4.7.2" 48 | }, 49 | "scripts": { 50 | "build": "tsc && webpack", 51 | "test": "mocha --timeout 90000 --require ts-node/register --project tsconfig.json --recursive ./tests/**/*.ts", 52 | "examples": "npm run build && cd examples && node node-example.js && node --experimental-wasi-unstable-preview1 --experimental-wasm-bigint wasi-example.js" 53 | }, 54 | "license": "MIT" 55 | } 56 | -------------------------------------------------------------------------------- /readme.md: -------------------------------------------------------------------------------- 1 | # wasm-linker-js 2 | 3 | ### A simple WebAssembly Linker in JavaScript 4 | 5 | ![actions badge][actions-badge] [![NPM version][npm-image]][npm] 6 | 7 | This is _an experimental_ JavaScript library that helps instantiating 8 | WebAssembly modules with imports by providing functionality to link JavaScript 9 | objects (functions, memories, globals) as imports, as well as automatically 10 | perform name based resolution for linking entire modules. 11 | 12 | The API loosely follows the [Wasmtime][wasmtime] linker, (see the [linker 13 | documentation][wasmtime-linker]), and it exposes asynchronous import 14 | functionality enabled by [Binaryen][binaryen] and [Asyncify][asyncify]. 15 | 16 | ### Using the Linker 17 | 18 | > For more examples of using the Linker in both TypeScript and JavaScript, check 19 | > the [linker tests][linker-tests] and the [Node.js examples][node-examples]. 20 | 21 | First, add the package to your project: 22 | 23 | ```plaintext 24 | $ npm install @deislabs/wasm-linker-js 25 | ``` 26 | 27 | > Note that in order to run the examples shown here, `binaryen` is also required 28 | > (`npm install binaryen`), in order to show the text format of the WebAssembly 29 | > modules. In real world scenarios that is not necessary, and the modules can be 30 | > compiled from their binary representation without additional dependencies. 31 | 32 | #### Defining a single import 33 | 34 | Assuming we are trying to instantiate the module represented in its text format 35 | below (transformed to its binary representation using [Binaryen][binaryen]), we 36 | can satisfy its import using the `define` method available on the linker: 37 | 38 | ```js 39 | const { Linker } = require("@deislabs/wasm-linker-js"); 40 | const { parseText } = require("binaryen"); 41 | 42 | const usingAdd = ` 43 | (module 44 | (import "calculator" "add" (func $calc_add (param i32 i32) (result i32))) 45 | 46 | (memory 1 1) 47 | (export "memory" (memory 0)) 48 | (export "add" (func $add)) 49 | 50 | (func $add (param i32) (param i32) (result i32) 51 | (return 52 | (call $calc_add 53 | (local.get 0) 54 | (local.get 1) 55 | ) 56 | ) 57 | ) 58 | ) 59 | `; 60 | 61 | (async () => { 62 | var linker = new Linker(); 63 | 64 | // The "usingAdd" module imports calculator.add. 65 | // We define it, provide a JS implementation, then 66 | // instantiate it. 67 | linker.define("calculator", "add", (a, b) => a + b); 68 | var calc = await linker.instantiate(parseText(usingAdd).emitBinary()); 69 | 70 | var result = calc.instance.exports.add(1, 2); 71 | console.log(result); 72 | })(); 73 | ``` 74 | 75 | #### Linking an entire module 76 | 77 | If we have a compiled module that exports items (defined below in its text 78 | format and contained in the `add` constant) that our initial module needs to 79 | import, we can add it to the linker, then continue instantiating our module 80 | (defined above in its text format and contained in the `usingAdd` constant): 81 | 82 | ```js 83 | const { Linker } = require("@deislabs/wasm-linker-js"); 84 | const { parseText } = require("binaryen"); 85 | 86 | const add = ` 87 | (module 88 | (memory 1 1) 89 | (export "memory" (memory 0)) 90 | (export "add" (func $add)) 91 | 92 | (func $add (param i32) (param i32) (result i32) 93 | (return 94 | (i32.add 95 | (local.get 0) 96 | (local.get 1) 97 | ) 98 | ) 99 | ) 100 | ) 101 | `; 102 | 103 | (async () => { 104 | var linker = new Linker(); 105 | 106 | // The "usingAdd" module above imports calculator.add. 107 | // We link a module that exports the functionality 108 | // required, then instantiate the module that uses it. 109 | await linker.module( 110 | "calculator", 111 | new WebAssembly.Module(parseText(add).emitBinary()) 112 | ); 113 | var calc = await linker.instantiate(parseText(usingAdd).emitBinary()); 114 | var result = calc.instance.exports.add(1, 2); 115 | console.log(result); 116 | })(); 117 | ``` 118 | 119 | #### Defining asynchronous imports 120 | 121 | The current WebAssembly MVP does not have a way of waiting for the execution of 122 | asynchronous imports (see [this issue][async-wasm-issue]). To enable this 123 | functionality, [Binaryen][binaryen] has a pass that [transforms a Wasm module 124 | and allows it to pause and resume by unwiding and rewinding the call 125 | stack][asyncify-blog]. When enabled, this library can use the [JavaScript 126 | wrapper of Asyncify][asyncify] and define asynchronous import functions for 127 | WebAssembly modules (note that the Asyncify pass must have been applied to the 128 | module before instantiating using the linker): 129 | 130 | ```js 131 | const { Linker } = require("@deislabs/wasm-linker-js"); 132 | const { parseText } = require("binaryen"); 133 | 134 | (async () => { 135 | var useAsyncify = true; 136 | var linker = new Linker(useAsyncify); 137 | 138 | // Notice how we define an asynchronous import, which 139 | // will wait for 1.5s before returning the result. 140 | var sleep = function (ms) { 141 | return new Promise((resolve) => { 142 | setTimeout(resolve, ms); 143 | }); 144 | }; 145 | linker.define("calculator", "add", async (a, b) => { 146 | await sleep(1500); 147 | return a + b; 148 | }); 149 | 150 | let bytes = parseText(usingAdd); 151 | 152 | // we perform the asyncify compiler pass from Binaryen 153 | bytes.runPasses(["asyncify"]); 154 | var calc = await linker.instantiate(bytes.emitBinary()); 155 | 156 | var result = await calc.instance.exports.add(1, 2); 157 | console.log(result); 158 | })(); 159 | ``` 160 | 161 | #### Using the streaming APIs in the browser 162 | 163 | For browsers that support the WebAssembly streaming APIs, the linker exposes two 164 | methods that can be used to efficiently instantiate modules from a streamed 165 | source: `moduleStreaming`, which instantiates a module and adds its exports to 166 | the linker's cache, and `instantiateStreaming`, which instantiates a module and 167 | returns its the `WebAssemblyInstantiatedSource`: 168 | 169 | ```js 170 | (async () => { 171 | var linker = new Linker(); 172 | await linker.moduleStreaming("calculator", fetch("calculator.wasm")); 173 | var mod = await linker.instantiateStreaming(fetch("using_calculator.wasm")); 174 | console.log(mod.instance.exports.multiply(3, 4)); 175 | } 176 | ``` 177 | 178 | See [the documentation for the browser streaming APIs][mdn-streaming] for more 179 | information about instantiating modules from streamed sources. 180 | 181 | The linker also allows adding an already instantiated module, through the 182 | `instance` method, and aliasing a module under a new name, through the `alias` 183 | method. Most public methods defined on the Linker have a correspondent in the 184 | [Wasmtime][wasmtime] Linker, and we try to keep the APIs similar. 185 | 186 | ### Implementation notes and known issues 187 | 188 | - When defining multiple import items with the same name, the last one takes 189 | precedence (the existing items are replaced). This behavior could change in 190 | the future to add a configurable property defining whether import shadowing 191 | should be allowed. 192 | - When instantiating a linker with Asyncify enabled, _all_ modules linked and 193 | instantiated with the linker will be instantiated using Asyncify's JavaScript 194 | wrapper. This behavior could change in the future to allow a per-instance (and 195 | by extension per module linked) setting for Asyncify. (this can be avoided 196 | through instantiating a module separately and adding it to the linker using 197 | the `instance` method). 198 | - There is a [browser example in the `examples/` directory][browser-demo] in 199 | this repository. While functional, the implementation is far from ideal - the 200 | WebPack configuration for generating a browser-compatible library is not 201 | optimal (this should be changed to use ECMAScript modules). 202 | - **This library is experimental, and the API is not stable**. We welcome 203 | feedback on both the public API and the implementation of this library. 204 | 205 | ### Contributing 206 | 207 | This project welcomes contributions through the GitHub pull request process. 208 | Prerequisites to building the project: 209 | 210 | - Node.js 211 | - `npm` 212 | 213 | To iterate on the project locally: 214 | 215 | ```plaintext 216 | $ npm run build 217 | $ npm test 218 | $ npm run examples 219 | ``` 220 | 221 | ### Code of Conduct 222 | 223 | This project has adopted the 224 | [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). 225 | 226 | For more information see the 227 | [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or 228 | contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any 229 | additional questions or comments. 230 | 231 | [wasmtime]: https://github.com/bytecodealliance/wasmtime 232 | [wasmtime-linker]: https://docs.rs/wasmtime/0.21.0/wasmtime/ 233 | [binaryen]: https://github.com/WebAssembly/binaryen 234 | [asyncify]: https://github.com/GoogleChromeLabs/asyncify 235 | [async-wasm-issue]: https://github.com/WebAssembly/design/issues/720 236 | [asyncify-blog]: https://kripken.github.io/blog/wasm/2019/07/16/asyncify.html 237 | [browser-demo]: examples/index.html 238 | [node-examples]: examples/node-example.js 239 | [linker-tests]: tests/linker.ts 240 | [mdn-streaming]: 241 | https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/instantiateStreaming 242 | [npm-image]: https://badge.fury.io/js/%40deislabs%2Fwasm-linker-js.svg 243 | [npm]: https://www.npmjs.com/package/@deislabs/wasm-linker-js 244 | [actions-badge]: 245 | https://github.com/deislabs/wasm-linker-js/workflows/Build%20and%20Test/badge.svg 246 | -------------------------------------------------------------------------------- /serve.js: -------------------------------------------------------------------------------- 1 | // A simple web server that serves Wasm modules 2 | // using the appropriate MIME type. 3 | // 4 | // Used to run the browser example, which fetches 5 | // WebAssembly modules and instantiates them. 6 | 7 | var express = require("express"); 8 | var app = express(); 9 | express.static.mime.types["wasm"] = "application/wasm"; 10 | app.use(express.static(__dirname + "/")); 11 | app.listen(8080); 12 | -------------------------------------------------------------------------------- /src/index.ts: -------------------------------------------------------------------------------- 1 | export { Linker } from "./linker"; 2 | export { Store } from "./store"; 3 | -------------------------------------------------------------------------------- /src/linker.ts: -------------------------------------------------------------------------------- 1 | import * as asyncify from "asyncify-wasm"; 2 | import { Store } from "./store"; 3 | 4 | /** 5 | * A JavaScript object that can be used to link WebAssembly instances. 6 | * 7 | * This is a helper class to be used when instantiating WebAssembly 8 | * modules with imports. It can be used to define individual imports 9 | * (like functions, or memories), or link entire modules when 10 | * instantiating modules that depend on other modules. 11 | */ 12 | export class Linker { 13 | public store: Store; 14 | public useAsyncify: boolean; 15 | 16 | constructor(useAsyncify: boolean = false, store: Store = new Store()) { 17 | this.useAsyncify = useAsyncify; 18 | this.store = store; 19 | } 20 | 21 | /** 22 | * Adds a new WebAssembly.ImportValue to the imports cache. 23 | * 24 | * Example: 25 | * ```js 26 | const { Linker } = require("@deislabs/wasm-linker-js"); 27 | const { parseText } = require("binaryen"); 28 | const assert = require("assert"); 29 | 30 | (async () => { 31 | const usingAdd = ` 32 | (module 33 | (import "calculator" "add" (func $calc_add (param i32 i32) (result i32)) 34 | (export "add" (func $add)) 35 | 36 | (func $add (param i32) (param i32) (result i32) 37 | (return 38 | (call $calc_add 39 | (local.get 0) 40 | (local.get 1) 41 | ) 42 | ) 43 | ) 44 | ) 45 | `; 46 | 47 | var linker = new Linker(); 48 | 49 | // the "usingAdd" module above imports calculator.add 50 | // we define it and provide a JS implementation, then 51 | // instantiate it. 52 | linker.define("calculator", "add", (a, b) => a + b); 53 | var calc = await linker.instantiate( 54 | parseText(usingAdd).emitBinary()); 55 | assert.equal(await calc.instance.exports.add(1, 2), 3) 56 | * ``` 57 | */ 58 | define(module: string, name: string, item: WebAssembly.ImportValue): void { 59 | return this.store.addImport(module, name, item); 60 | } 61 | 62 | /** 63 | * Instantiate and add a module to the linker's instance cache. 64 | * 65 | * Example: 66 | * ```js 67 | const { Linker } = require("@deislabs/wasm-linker-js"); 68 | const { parseText } = require("binaryen"); 69 | const assert = require("assert"); 70 | 71 | (async () => { 72 | const usingAdd = ` 73 | (module 74 | (import "calculator" "add" (func $calc_add (param i32 i32) (result i32))) 75 | (export "add" (func $add)) 76 | 77 | (func $add (param i32) (param i32) (result i32) 78 | (return 79 | (call $calc_add 80 | (local.get 0) 81 | (local.get 1) 82 | ) 83 | ) 84 | ) 85 | ) 86 | `; 87 | 88 | const add = ` 89 | (module 90 | (memory 1 1) 91 | (export "memory" (memory 0)) 92 | (export "add" (func $add)) 93 | 94 | (func $add (param i32) (param i32) (result i32) 95 | (return 96 | (i32.add 97 | (local.get 0) 98 | (local.get 1) 99 | ) 100 | ) 101 | ) 102 | ) 103 | `; 104 | 105 | var linker = new Linker(); 106 | 107 | // the "usingAdd" module above imports calculator.add 108 | // we link a module that we know exports the functionality 109 | // required, then instantiate the module that uses it. 110 | 111 | await linker.module( 112 | "calculator", 113 | new WebAssembly.Module(parseText(add).emitBinary()) 114 | ); 115 | var calc = await linker.instantiate(parseText(add).emitBinary()); 116 | assert.equal(await calc.instance.exports.add(1, 41), 42); 117 | })(); 118 | *``` 119 | */ 120 | async module(name: string, module: WebAssembly.Module): Promise { 121 | return this.store.addInstance(name, await this.instantiate(module)); 122 | } 123 | 124 | /** 125 | * Instantiate a module using `instantiateStreaming` and add its exports 126 | * to the linker's cache. 127 | * Not available in Safari and Node.js. 128 | * See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/instantiateStreaming 129 | * Example: 130 | * ```js 131 | var linker = new Linker(); 132 | await linker.moduleStreaming("calculator", fetch("calculator.wasm")); 133 | var mod = await linker.instantiateStreaming( 134 | fetch("using_calculator.wasm") 135 | ); 136 | console.log(mod.instance.exports.multiply(3, 4)); 137 | ``` 138 | */ 139 | async moduleStreaming(name: string, source: Response): Promise { 140 | return this.store.addInstance( 141 | name, 142 | await (await this.instantiateStreaming(source)).instance 143 | ); 144 | } 145 | 146 | /** 147 | * Add an instance to the linker's instance cache. 148 | * Example: 149 | * ```js 150 | const { Linker } = require("@deislabs/wasm-linker-js"); 151 | const { parseText } = require("binaryen"); 152 | const assert = require("assert"); 153 | 154 | (async () => { 155 | const usingAdd = ` 156 | (module 157 | (import "calculator" "add" (func $calc_add (param i32 i32) (result i32))) 158 | (export "add" (func $add)) 159 | 160 | (func $add (param i32) (param i32) (result i32) 161 | (return 162 | (call $calc_add 163 | (local.get 0) 164 | (local.get 1) 165 | ) 166 | ) 167 | ) 168 | ) 169 | `; 170 | 171 | const add = ` 172 | (module 173 | (memory 1 1) 174 | (export "memory" (memory 0)) 175 | (export "add" (func $add)) 176 | 177 | (func $add (param i32) (param i32) (result i32) 178 | (return 179 | (i32.add 180 | (local.get 0) 181 | (local.get 1) 182 | ) 183 | ) 184 | ) 185 | ) 186 | `; 187 | 188 | var linker = new Linker(); 189 | var depsInstance = await WebAssembly.instantiate( 190 | new WebAssembly.Module(parseText(add).emitBinary()) 191 | ); 192 | linker.instance("calculator", depsInstance); 193 | var calc = await linker.instantiate(parseText(usingAdd).emitBinary()); 194 | 195 | assert.equal(await calc.instance.exports.add(1, 41), 42); 196 | })(); 197 | *``` 198 | */ 199 | instance(name: string, instance: WebAssembly.Instance): void { 200 | return this.store.addInstance(name, instance); 201 | } 202 | 203 | /** 204 | * Alias all exports from one module as another. 205 | * Example: 206 | * ```js 207 | const { Linker } = require("@deislabs/wasm-linker-js"); 208 | const { parseText } = require("binaryen"); 209 | const assert = require("assert"); 210 | 211 | (async () => { 212 | const add = ` 213 | (module 214 | (memory 1 1) 215 | (export "memory" (memory 0)) 216 | (export "add" (func $add)) 217 | 218 | (func $add (param i32) (param i32) (result i32) 219 | (return 220 | (i32.add 221 | (local.get 0) 222 | (local.get 1) 223 | ) 224 | ) 225 | ) 226 | ) 227 | `; 228 | 229 | const usingAddWithAlias = ` 230 | (module 231 | (import "calculator1" "add" (func $calc_add1 (param i32 i32) (result i32))) 232 | (import "calculator2" "add" (func $calc_add2 (param i32 i32) (result i32))) 233 | 234 | (memory 1 1) 235 | (export "memory" (memory 0)) 236 | 237 | (export "add1" (func $add1)) 238 | (export "add2" (func $add2)) 239 | 240 | (func $add1 (param i32) (param i32) (result i32) 241 | (return 242 | (call $calc_add1 243 | (local.get 0) 244 | (local.get 1) 245 | ) 246 | ) 247 | ) 248 | 249 | (func $add2 (param i32) (param i32) (result i32) 250 | (return 251 | (call $calc_add2 252 | (local.get 0) 253 | (local.get 1) 254 | ) 255 | ) 256 | ) 257 | ) 258 | `; 259 | 260 | var linker = new Linker(); 261 | // we first define the module that implements `add` as `calculator1` 262 | await linker.module( 263 | "calculator1", 264 | new WebAssembly.Module(parseText(add).emitBinary()) 265 | ); 266 | // we alias `calculator1` as `calculator2` 267 | linker.alias("calculator1", "calculator2"); 268 | var calc = await linker.instantiate( 269 | parseText(usingAddWithAlias).emitBinary() 270 | ); 271 | 272 | assert.equal(await calc.instance.exports.add1(1, 99), 100); 273 | assert.equal(await calc.instance.exports.add2(2, 99), 101); 274 | })(); 275 | *``` 276 | */ 277 | alias(module: string, asModule: string): void { 278 | return this.store.aliasModule(module, asModule); 279 | } 280 | 281 | /** 282 | * Instantiate a WebAssembly module. 283 | * 284 | * This function iterates through the module's imports and performs 285 | * name based resolution in trying to satisfy all module imports. 286 | * First, it searches 287 | * 288 | * This function iterates through the module's imports and does a 289 | * name based import resolution based on the exported items of the 290 | * modules in the store's instance cache, and passes the store's 291 | * imports cache when actually instantiates the module. 292 | */ 293 | async instantiate(module: WebAssembly.Module): Promise { 294 | return this.useAsyncify 295 | ? await asyncify.instantiate(module, this.store.imports) 296 | : await WebAssembly.instantiate(module, this.store.imports); 297 | } 298 | 299 | /** 300 | * Compile and instantiate a WebAssembly module directly from a streamed 301 | * underlying source. 302 | * Not available in Safari and Node.js. 303 | * See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/instantiateStreaming 304 | * 305 | * Example: 306 | * ```js 307 | var linker = new Linker(); 308 | var mod = await linker.instantiateStreaming( 309 | fetch("calculator.wasm") 310 | ); 311 | console.log(mod.instance.exports.multiply(3, 4)); 312 | ``` 313 | */ 314 | async instantiateStreaming( 315 | source: Response 316 | ): Promise { 317 | return this.useAsyncify 318 | ? await asyncify.instantiateStreaming(source, this.store.imports) 319 | : await WebAssembly.instantiateStreaming(source, this.store.imports); 320 | } 321 | 322 | /** 323 | * Add an imports object to the linker. 324 | * Example: 325 | * ```js 326 | const { Linker } = require("@deislabs/wasm-linker-js"); 327 | const { parseText } = require("binaryen"); 328 | const assert = require("assert"); 329 | 330 | (async () => { 331 | const usingAdd = ` 332 | (module 333 | (import "calculator" "add" (func $calc_add (param i32 i32) (result i32)) 334 | (export "add" (func $add)) 335 | 336 | (func $add (param i32) (param i32) (result i32) 337 | (return 338 | (call $calc_add 339 | (local.get 0) 340 | (local.get 1) 341 | ) 342 | ) 343 | ) 344 | ) 345 | `; 346 | 347 | var linker = new Linker(); 348 | 349 | var importObject = { 350 | calculator: { 351 | add: (a: number, b: number) => a + b, 352 | }, 353 | }; 354 | 355 | linker.imports(importObject); 356 | 357 | var calc = await linker.instantiate( 358 | parseText(usingAdd).emitBinary()); 359 | assert.equal(await calc.instance.exports.add(1, 2), 3) 360 | * ``` 361 | */ 362 | imports(importObject: any): void { 363 | // This ensures that import objects defined using the 364 | // current convention can be directly reused when 365 | // using this linker. 366 | // 367 | // The signature is not ideal, and in the future we 368 | // should explore making `importObject` a typed 369 | // object. 370 | return this.store.addImportObject(importObject); 371 | } 372 | 373 | // This is currently unused. 374 | // If we were to use this type of resolution, we would always 375 | // have to make an explicit choice between first adding imports 376 | // defined by the user versus those coming from modules (imports 377 | // not manually defined by a user, but automatically resolved by name). 378 | // 379 | // See the implementation of Store.addInstance, but in short, 380 | // in the case of identical import names, the one defined last 381 | // will be used, regardless of whether it was explicitly 382 | // defined using `defined` or with `module`. 383 | // 384 | // Leaving this function here for completeness. 385 | // @ts-ignore 386 | private resolveImports(module: WebAssembly.Module): void { 387 | let imports = WebAssembly.Module.imports(module); 388 | imports.forEach((im) => { 389 | if ( 390 | this.store.instances[im.module] !== undefined && 391 | this.store.instances[im.module].exports[im.name] !== undefined 392 | ) { 393 | this.define( 394 | im.module, 395 | im.name, 396 | this.store.instances[im.module].exports[im.name] 397 | ); 398 | } 399 | }); 400 | } 401 | } 402 | -------------------------------------------------------------------------------- /src/store.ts: -------------------------------------------------------------------------------- 1 | export class Store { 2 | public instances: Record; 3 | public imports: Record>; 4 | 5 | constructor() { 6 | this.imports = {}; 7 | this.instances = {}; 8 | } 9 | 10 | /** 11 | * Add an import to the imports cache. 12 | * 13 | * Identical import names will always be replaced 14 | * by the last one defined. 15 | */ 16 | public addImport( 17 | module: string, 18 | name: string, 19 | item: WebAssembly.ImportValue 20 | ): void { 21 | // If this is the first import defined for the given module, 22 | // create the entry for the module in the imports cache. 23 | if (this.imports[module] === undefined) { 24 | this.imports[module] = {}; 25 | } 26 | 27 | this.imports[module][name] = item; 28 | } 29 | 30 | /** 31 | * Add an imports object to the imports cache. 32 | */ 33 | public addImportObject(importObject: any): void { 34 | for (const [mod, im] of Object.entries(importObject)) { 35 | this.imports[mod] = im as Record; 36 | } 37 | } 38 | 39 | /** 40 | * Add an instance to the store's instance cache, and 41 | * all its exports to the imports cache. 42 | * 43 | * After each call to the `addInstance` function, the imports 44 | * cache will contain all exports from the instance, with 45 | * identical import names replaced by the latest definition 46 | */ 47 | public addInstance(name: string, instance: WebAssembly.Instance): void { 48 | this.instances[name] = instance; 49 | 50 | for (const [exp, value] of Object.entries(instance.exports)) { 51 | this.addImport(name, exp, value); 52 | } 53 | } 54 | 55 | public aliasModule(module: string, asModule: string): void { 56 | for (const [name, value] of Object.entries(this.imports[module])) { 57 | this.addImport(asModule, name, value); 58 | } 59 | } 60 | } 61 | -------------------------------------------------------------------------------- /tests/linker.ts: -------------------------------------------------------------------------------- 1 | import "mocha"; 2 | import { assert } from "chai"; 3 | import * as wat from "./wat"; 4 | import { Linker } from "../src/linker"; 5 | 6 | describe("linker tests", async () => { 7 | it("correctly define a single method and instantiate", async () => { 8 | let linker = new Linker(); 9 | linker.define("calculator", "add", (a: number, b: number) => a + b); 10 | let instance = await linker.instantiate(wat.moduleFromText(wat.usingAdd)); 11 | assert.equal(await (instance.exports["add"] as Function)(1, 2), 3); 12 | }); 13 | 14 | it("correctly define an entire module and instantiate", async () => { 15 | let linker = new Linker(); 16 | await linker.module("calculator", wat.moduleFromText(wat.add)); 17 | let instance = await linker.instantiate(wat.moduleFromText(wat.usingAdd)); 18 | assert.equal(await (instance.exports["add"] as Function)(1, 2), 3); 19 | }); 20 | 21 | it("ensure the last import is chosen between identical imports", async () => { 22 | let linker = new Linker(); 23 | linker.define("calculator", "add", (a: number, b: number) => 42); 24 | 25 | await linker.module("calculator", wat.moduleFromText(wat.add)); 26 | let instance = await linker.instantiate(wat.moduleFromText(wat.usingAdd)); 27 | assert.equal(await (instance.exports["add"] as Function)(1, 2), 3); 28 | }); 29 | 30 | it("ensure the last import is chosen between identical imports with changed order", async () => { 31 | let linker = new Linker(); 32 | await linker.module("calculator", wat.moduleFromText(wat.add)); 33 | linker.define("calculator", "add", (a: number, b: number) => 42); 34 | let instance = await linker.instantiate(wat.moduleFromText(wat.usingAdd)); 35 | assert.equal(await (instance.exports["add"] as Function)(1, 2), 42); 36 | }); 37 | 38 | it("use last item when multiple identical items are defined", async () => { 39 | let linker = new Linker(); 40 | 41 | linker.define("calculator", "add", (a: number, b: number) => 41); 42 | linker.define("calculator", "add", (a: number, b: number) => 42); 43 | await linker.module("calculator", wat.moduleFromText(wat.add)); 44 | linker.define("calculator", "add", (a: number, b: number) => 43); 45 | let instance = await linker.instantiate(wat.moduleFromText(wat.usingAdd)); 46 | assert.equal(await (instance.exports["add"] as Function)(1, 2), 43); 47 | }); 48 | 49 | it("define an async import", async () => { 50 | let useAsyncify = true; 51 | let linker = new Linker(useAsyncify); 52 | 53 | linker.define("calculator", "add", async () => { 54 | await sleep(1500); 55 | return 42; 56 | }); 57 | 58 | let instance = await linker.instantiate( 59 | wat.asyncModuleFromText(wat.usingAdd) 60 | ); 61 | assert.equal(await (instance.exports["add"] as Function)(1, 2), 42); 62 | }); 63 | 64 | it("add an existing instance to the linker", async () => { 65 | let linker = new Linker(); 66 | 67 | let calc = await WebAssembly.instantiate(wat.moduleFromText(wat.add), {}); 68 | linker.instance("calculator", calc); 69 | let instance = await linker.instantiate(wat.moduleFromText(wat.usingAdd)); 70 | assert.equal(await (instance.exports["add"] as Function)(1, 2), 3); 71 | }); 72 | 73 | it("alias modules", async () => { 74 | let linker = new Linker(); 75 | await linker.module("calculator1", wat.moduleFromText(wat.add)); 76 | linker.alias("calculator1", "calculator2"); 77 | let instance = await linker.instantiate( 78 | wat.asyncModuleFromText(wat.usingAddWithAlias) 79 | ); 80 | assert.equal(await (instance.exports["add"] as Function)(1, 2), 3); 81 | }); 82 | 83 | it("add import object to the linker", async () => { 84 | let linker = new Linker(); 85 | var importObject = { 86 | calculator: { 87 | add: (a: number, b: number) => a + b, 88 | }, 89 | }; 90 | 91 | linker.imports(importObject); 92 | let instance = await linker.instantiate(wat.moduleFromText(wat.usingAdd)); 93 | assert.equal(await (instance.exports["add"] as Function)(1, 2), 3); 94 | }); 95 | 96 | it("add import object with multiple imports to the linker", async () => { 97 | let linker = new Linker(); 98 | var importObject = { 99 | calculator1: { 100 | add: (a: number, b: number) => a + b, 101 | }, 102 | calculator2: { 103 | add: (a: number, b: number) => a + b, 104 | }, 105 | }; 106 | 107 | linker.imports(importObject); 108 | let instance = await linker.instantiate( 109 | wat.moduleFromText(wat.usingAddWithAlias) 110 | ); 111 | assert.equal(await (instance.exports["add"] as Function)(1, 2), 3); 112 | }); 113 | }); 114 | 115 | async function sleep(ms: number) { 116 | return new Promise((resolve) => { 117 | setTimeout(resolve, ms); 118 | }); 119 | } 120 | -------------------------------------------------------------------------------- /tests/store.ts: -------------------------------------------------------------------------------- 1 | import "mocha"; 2 | import { assert } from "chai"; 3 | import { Store } from "../src/store"; 4 | import * as wat from "./wat"; 5 | 6 | describe("store tests", async () => { 7 | it("a new store contains zero imports and instances in cache", () => { 8 | let store = new Store(); 9 | assert.equal(Object.keys(store.imports).length, 0); 10 | assert.equal(Object.keys(store.instances).length, 0); 11 | }); 12 | 13 | it("the length of the import cache for a new store with one import defined is one", () => { 14 | let store = new Store(); 15 | store.addImport("module1", "function1", () => {}); 16 | assert.equal(Object.keys(store.imports).length, 1); 17 | assert.equal(Object.keys(store.imports["module1"]).length, 1); 18 | assert.equal(Object.keys(store.instances).length, 0); 19 | }); 20 | 21 | it("a function import is properly added in the import cache", () => { 22 | let store = new Store(); 23 | let fn = (a: number, b: number) => a + b; 24 | store.addImport("module1", "function1", fn); 25 | assert.equal(store.imports["module1"]["function1"], fn); 26 | }); 27 | 28 | it("a memory import is properly added in the import cache", () => { 29 | let store = new Store(); 30 | let memory = new WebAssembly.Memory({ initial: 10, maximum: 100 }); 31 | store.addImport("some-module-import", "memory", memory); 32 | assert.equal(store.imports["some-module-import"]["memory"], memory); 33 | }); 34 | 35 | it("the length of the instance cache for a new store with one instance defined with one export is one", async () => { 36 | let store = new Store(); 37 | let module = wat.moduleFromText(wat.add); 38 | store.addInstance("calculator", await WebAssembly.instantiate(module, {})); 39 | 40 | assert.equal(Object.keys(store.imports).length, 1); 41 | assert.equal(Object.keys(store.instances).length, 1); 42 | }); 43 | 44 | it("a module alias creates entry for the alias", () => { 45 | let store = new Store(); 46 | let fn1 = (a: number, b: number) => a + b; 47 | let fn2 = (a: number, b: number) => a * b; 48 | store.addImport("calculator1", "function1", fn1); 49 | store.addImport("calculator1", "function2", fn2); 50 | 51 | store.aliasModule("calculator1", "calculator2"); 52 | assert.equal(Object.keys(store.imports["calculator2"]).length, 2); 53 | assert.equal(store.imports["calculator2"]["function1"], fn1); 54 | assert.equal(store.imports["calculator2"]["function2"], fn2); 55 | }); 56 | 57 | it("an import object is correctly added to the store", () => { 58 | let store = new Store(); 59 | 60 | let name = "someModule"; 61 | let fnName = "imported_func"; 62 | let fn = () => {}; 63 | 64 | let importObject = { 65 | [name]: { 66 | [fnName]: fn, 67 | }, 68 | }; 69 | 70 | store.addImportObject(importObject); 71 | 72 | assert.equal(Object.keys(store.imports).length, 1); 73 | assert.equal(Object.keys(store.imports["someModule"]).length, 1); 74 | assert.equal(store.imports[name][fnName], fn); 75 | }); 76 | }); 77 | -------------------------------------------------------------------------------- /tests/wat.ts: -------------------------------------------------------------------------------- 1 | import { parseText } from "binaryen"; 2 | 3 | export function moduleFromText(text: string): WebAssembly.Module { 4 | return new WebAssembly.Module(parseText(text).emitBinary()); 5 | } 6 | 7 | export function asyncModuleFromText(text: string): WebAssembly.Module { 8 | let bytes = parseText(text); 9 | bytes.runPasses(["asyncify"]); 10 | 11 | return new WebAssembly.Module(bytes.emitBinary()); 12 | } 13 | 14 | export const add = ` 15 | (module 16 | (memory 1 1) 17 | (export "memory" (memory 0)) 18 | (export "add" (func $add)) 19 | 20 | (func $add (param i32) (param i32) (result i32) 21 | (return 22 | (i32.add 23 | (local.get 0) 24 | (local.get 1) 25 | ) 26 | ) 27 | ) 28 | ) 29 | `; 30 | 31 | export const usingAdd = ` 32 | (module 33 | (import "calculator" "add" (func $calc_add (param i32 i32) (result i32))) 34 | 35 | (memory 1 1) 36 | (export "memory" (memory 0)) 37 | (export "add" (func $add)) 38 | 39 | (func $add (param i32) (param i32) (result i32) 40 | (return 41 | (call $calc_add 42 | (local.get 0) 43 | (local.get 1) 44 | ) 45 | ) 46 | ) 47 | ) 48 | `; 49 | 50 | export const usingAddWithAlias = ` 51 | (module 52 | (import "calculator1" "add" (func $calc_add (param i32 i32) (result i32))) 53 | (import "calculator2" "add" (func $calc_add2 (param i32 i32) (result i32))) 54 | 55 | (memory 1 1) 56 | (export "memory" (memory 0)) 57 | (export "add" (func $add)) 58 | 59 | (func $add (param i32) (param i32) (result i32) 60 | (return 61 | (call $calc_add 62 | (local.get 0) 63 | (local.get 1) 64 | ) 65 | ) 66 | ) 67 | ) 68 | `; 69 | -------------------------------------------------------------------------------- /tsconfig.json: -------------------------------------------------------------------------------- 1 | { 2 | "compilerOptions": { 3 | "target": "es6", 4 | "lib": ["es2015", "dom"], 5 | "module": "CommonJS", 6 | "declaration": true, 7 | "outDir": "dist", 8 | "strict": true, 9 | "sourceMap": true, 10 | "baseUrl": ".", 11 | "paths": { 12 | "*": ["src/@types/*"] 13 | } 14 | }, 15 | "include": ["src/**/*", "tests/**/*"] 16 | } 17 | -------------------------------------------------------------------------------- /webpack.config.js: -------------------------------------------------------------------------------- 1 | path = require("path"); 2 | module.exports = { 3 | entry: "./src/index.ts", 4 | devtool: "inline-source-map", 5 | module: { 6 | rules: [ 7 | { 8 | test: /\.tsx?$/, 9 | use: "ts-loader", 10 | exclude: /node_modules/, 11 | }, 12 | ], 13 | }, 14 | resolve: { 15 | modules: [path.resolve(__dirname, "./src"), "node_modules"], 16 | extensions: [".ts", ".js"], 17 | }, 18 | output: { 19 | filename: "wasm-linker.js", 20 | path: path.resolve(__dirname, "dist"), 21 | libraryTarget: "umd", 22 | }, 23 | }; 24 | --------------------------------------------------------------------------------