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#!/usr/bin/node --expose-wasm |
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const fs = require('fs'), |
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assert = require('assert') |
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assert('WebAssembly' in global, |
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'WebAssembly global object not detected') |
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// Convert node Buffer to Uint8Array |
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function toUint8Array(buf) { |
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var u = new Uint8Array(buf.length) |
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for (var i = 0; i < buf.length; ++i) { |
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u[i] = buf[i] |
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} |
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return u |
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} |
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// Based on https://gist.github.com/kripken/59c67556dc03bb6d57052fedef1e61ab |
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// Loads a WebAssembly dynamic library, returns a promise. |
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// imports is an optional imports object |
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function loadWebAssembly(filename, imports) { |
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// Fetch the file and compile it |
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const buffer = toUint8Array(fs.readFileSync(filename)) |
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return WebAssembly.compile(buffer) |
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.then(module => { |
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// Create the imports for the module, including the |
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// standard dynamic library imports |
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imports = imports || {} |
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imports.env = imports.env || {} |
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imports.env.memoryBase = imports.env.memoryBase || 0 |
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imports.env.tableBase = imports.env.tableBase || 0 |
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if (!imports.env.memory) { |
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imports.env.memory = new WebAssembly.Memory({ initial: 256 }) |
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} |
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if (!imports.env.table) { |
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imports.env.table = new WebAssembly.Table({ initial: 0, element: 'anyfunc' }) |
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} |
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// Create the instance. |
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return new WebAssembly.Instance(module, imports) |
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}) |
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} |
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if (module.parent) { |
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module.exports.loadWebAssembly = loadWebAssembly |
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} else { |
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assert(process.argv.length >= 4, |
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'Usage: ./runwasm.js prog.wasm func INT_ARG...') |
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const wasm = process.argv[2], |
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func = process.argv[3], |
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// Convert args to either floats or ints |
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args = process.argv.slice(4).map( |
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x => x.match(/[.]/) ? parseFloat(x) : parseInt(x)) |
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loadWebAssembly(wasm) |
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.then(instance => { |
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var exports = instance.exports |
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assert(exports, 'no exports found') |
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assert(func in exports, func + ' not found in wasm module exports') |
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//console.log('calling exports.'+func+'('+args+')') |
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console.log(exports[func](...args)) |
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}) |
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.catch(res => { |
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console.log(res) |
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}) |
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} |
