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152 lines
4.7 KiB
152 lines
4.7 KiB
/*
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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 Generator = require("../Generator");
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const Template = require("../Template");
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const { RawSource } = require("webpack-sources");
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const WebAssemblyImportDependency = require("../dependencies/WebAssemblyImportDependency");
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const WebAssemblyExportImportedDependency = require("../dependencies/WebAssemblyExportImportedDependency");
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/** @typedef {import("../NormalModule")} NormalModule */
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/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
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/** @typedef {import("webpack-sources").Source} Source */
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/** @typedef {import("../Dependency").DependencyTemplate} DependencyTemplate */
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class WebAssemblyJavascriptGenerator extends Generator {
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/**
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* @param {NormalModule} module module for which the code should be generated
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* @param {Map<Function, DependencyTemplate>} dependencyTemplates mapping from dependencies to templates
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* @param {RuntimeTemplate} runtimeTemplate the runtime template
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* @param {string} type which kind of code should be generated
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* @returns {Source} generated code
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*/
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generate(module, dependencyTemplates, runtimeTemplate, type) {
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const initIdentifer = Array.isArray(module.usedExports)
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? Template.numberToIdentifer(module.usedExports.length)
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: "__webpack_init__";
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let needExportsCopy = false;
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const importedModules = new Map();
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const initParams = [];
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let index = 0;
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for (const dep of module.dependencies) {
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const depAsAny = /** @type {any} */ (dep);
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if (dep.module) {
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let importData = importedModules.get(dep.module);
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if (importData === undefined) {
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importedModules.set(
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dep.module,
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(importData = {
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importVar: `m${index}`,
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index,
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request:
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"userRequest" in depAsAny ? depAsAny.userRequest : undefined,
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names: new Set(),
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reexports: []
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})
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);
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index++;
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}
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if (dep instanceof WebAssemblyImportDependency) {
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importData.names.add(dep.name);
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if (dep.description.type === "GlobalType") {
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const exportName = dep.name;
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const usedName = dep.module && dep.module.isUsed(exportName);
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if (dep.module) {
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if (usedName) {
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initParams.push(
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runtimeTemplate.exportFromImport({
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module: dep.module,
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request: dep.request,
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importVar: importData.importVar,
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originModule: module,
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exportName: dep.name,
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asiSafe: true,
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isCall: false,
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callContext: null
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})
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);
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}
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}
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}
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}
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if (dep instanceof WebAssemblyExportImportedDependency) {
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importData.names.add(dep.name);
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const usedName = module.isUsed(dep.exportName);
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if (usedName) {
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const exportProp = `${module.exportsArgument}[${JSON.stringify(
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usedName
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)}]`;
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const defineStatement = Template.asString([
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`${exportProp} = ${runtimeTemplate.exportFromImport({
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module: dep.module,
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request: dep.request,
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importVar: importData.importVar,
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originModule: module,
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exportName: dep.name,
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asiSafe: true,
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isCall: false,
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callContext: null
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})};`,
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`if(WebAssembly.Global) ${exportProp} = ` +
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`new WebAssembly.Global({ value: ${JSON.stringify(
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dep.valueType
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)} }, ${exportProp});`
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]);
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importData.reexports.push(defineStatement);
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needExportsCopy = true;
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}
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}
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}
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}
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const importsCode = Template.asString(
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Array.from(
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importedModules,
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([module, { importVar, request, reexports }]) => {
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const importStatement = runtimeTemplate.importStatement({
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module,
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request,
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importVar,
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originModule: module
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});
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return importStatement + reexports.join("\n");
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}
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)
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);
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// create source
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const source = new RawSource(
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[
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'"use strict";',
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"// Instantiate WebAssembly module",
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"var wasmExports = __webpack_require__.w[module.i];",
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!Array.isArray(module.usedExports)
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? `__webpack_require__.r(${module.exportsArgument});`
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: "",
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// this must be before import for circular dependencies
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"// export exports from WebAssembly module",
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Array.isArray(module.usedExports) && !needExportsCopy
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? `${module.moduleArgument}.exports = wasmExports;`
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: "for(var name in wasmExports) " +
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`if(name != ${JSON.stringify(initIdentifer)}) ` +
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`${module.exportsArgument}[name] = wasmExports[name];`,
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"// exec imports from WebAssembly module (for esm order)",
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importsCode,
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"",
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"// exec wasm module",
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`wasmExports[${JSON.stringify(initIdentifer)}](${initParams.join(
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", "
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)})`
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].join("\n")
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);
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return source;
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}
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}
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module.exports = WebAssemblyJavascriptGenerator;
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