mirror of https://github.com/webpack/webpack.git
103 lines
2.5 KiB
JavaScript
103 lines
2.5 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const t = require("@webassemblyjs/ast");
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const { decode } = require("@webassemblyjs/wasm-parser");
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const { Tapable } = require("tapable");
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const WebAssemblyImportDependency = require("../dependencies/WebAssemblyImportDependency");
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/** @typedef {import("../Module")} Module */
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/**
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* @param {t.ModuleImport} n the import
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* @returns {boolean} true, if a memory was imported
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*/
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const isMemoryImport = n => n.descr.type === "Memory";
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/**
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* @param {t.ModuleImport} n the import
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* @returns {boolean} true, if a table was imported
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*/
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const isTableImport = n => n.descr.type === "Table";
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const JS_COMPAT_TYPES = new Set(["i32", "f32", "f64"]);
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/**
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* @param {t.ModuleImport} moduleImport the import
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* @returns {null | string} the type incompatible with js types
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*/
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const getJsIncompatibleType = moduleImport => {
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if (moduleImport.descr.type !== "FuncImportDescr") return null;
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const signature = moduleImport.descr.signature;
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for (const param of signature.params) {
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if (!JS_COMPAT_TYPES.has(param.valtype))
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return `${param.valtype} as parameter`;
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}
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for (const type of signature.results) {
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if (!JS_COMPAT_TYPES.has(type)) return `${type} as result`;
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}
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return null;
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};
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const decoderOpts = {
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ignoreCodeSection: true,
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ignoreDataSection: true
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};
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class WebAssemblyParser extends Tapable {
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constructor(options) {
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super();
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this.hooks = {};
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this.options = options;
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}
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parse(binary, state) {
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// flag it as ESM
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state.module.buildMeta.exportsType = "namespace";
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// parse it
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const ast = decode(binary, decoderOpts);
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// extract imports and exports
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const exports = (state.module.buildMeta.providedExports = []);
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t.traverse(ast, {
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ModuleExport({ node }) {
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exports.push(node.name);
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},
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ModuleImport({ node }) {
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/** @type {false | string} */
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let onlyDirectImport = false;
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if (isMemoryImport(node) === true) {
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onlyDirectImport = "Memory";
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} else if (isTableImport(node) === true) {
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onlyDirectImport = "Table";
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} else {
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const incompatibleType = getJsIncompatibleType(node);
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if (incompatibleType) {
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onlyDirectImport = `Non-JS-compatible Func Sigurature (${incompatibleType})`;
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}
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}
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const dep = new WebAssemblyImportDependency(
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node.module,
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node.name,
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node.descr,
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onlyDirectImport
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);
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state.module.addDependency(dep);
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}
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});
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return state;
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}
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}
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module.exports = WebAssemblyParser;
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