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458 lines
12 KiB
458 lines
12 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 WebAssemblyUtils = require("./WebAssemblyUtils");
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const { RawSource } = require("webpack-sources");
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const { editWithAST, addWithAST } = require("@webassemblyjs/wasm-edit");
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const { decode } = require("@webassemblyjs/wasm-parser");
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const t = require("@webassemblyjs/ast");
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const {
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moduleContextFromModuleAST
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} = require("@webassemblyjs/helper-module-context");
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const WebAssemblyExportImportedDependency = require("../dependencies/WebAssemblyExportImportedDependency");
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/** @typedef {import("../Module")} Module */
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/** @typedef {import("./WebAssemblyUtils").UsedWasmDependency} UsedWasmDependency */
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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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/**
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* @typedef {(ArrayBuffer) => ArrayBuffer} ArrayBufferTransform
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*/
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/**
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* @template T
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* @param {Function[]} fns transforms
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* @returns {Function} composed transform
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*/
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const compose = (...fns) => {
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return fns.reduce(
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(prevFn, nextFn) => {
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return value => nextFn(prevFn(value));
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},
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value => value
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);
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};
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// TODO replace with @callback
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/**
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* Removes the start instruction
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*
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* @param {Object} state unused state
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* @returns {ArrayBufferTransform} transform
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*/
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const removeStartFunc = state => bin => {
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return editWithAST(state.ast, bin, {
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Start(path) {
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path.remove();
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}
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});
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};
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/**
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* Get imported globals
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*
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* @param {Object} ast Module's AST
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* @returns {Array<t.ModuleImport>} - nodes
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*/
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const getImportedGlobals = ast => {
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const importedGlobals = [];
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t.traverse(ast, {
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ModuleImport({ node }) {
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if (t.isGlobalType(node.descr)) {
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importedGlobals.push(node);
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}
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}
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});
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return importedGlobals;
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};
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/**
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* Get the count for imported func
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*
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* @param {Object} ast Module's AST
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* @returns {Number} - count
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*/
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const getCountImportedFunc = ast => {
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let count = 0;
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t.traverse(ast, {
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ModuleImport({ node }) {
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if (t.isFuncImportDescr(node.descr)) {
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count++;
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}
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}
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});
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return count;
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};
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/**
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* Get next type index
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*
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* @param {Object} ast Module's AST
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* @returns {t.Index} - index
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*/
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const getNextTypeIndex = ast => {
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const typeSectionMetadata = t.getSectionMetadata(ast, "type");
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if (typeSectionMetadata === undefined) {
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return t.indexLiteral(0);
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}
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return t.indexLiteral(typeSectionMetadata.vectorOfSize.value);
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};
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/**
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* Get next func index
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*
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* The Func section metadata provide informations for implemented funcs
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* in order to have the correct index we shift the index by number of external
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* functions.
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*
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* @param {Object} ast Module's AST
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* @param {Number} countImportedFunc number of imported funcs
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* @returns {t.Index} - index
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*/
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const getNextFuncIndex = (ast, countImportedFunc) => {
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const funcSectionMetadata = t.getSectionMetadata(ast, "func");
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if (funcSectionMetadata === undefined) {
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return t.indexLiteral(0 + countImportedFunc);
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}
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const vectorOfSize = funcSectionMetadata.vectorOfSize.value;
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return t.indexLiteral(vectorOfSize + countImportedFunc);
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};
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/**
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* Creates an init instruction for a global type
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* @param {t.GlobalType} globalType the global type
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* @returns {t.Instruction} init expression
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*/
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const createDefaultInitForGlobal = globalType => {
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if (globalType.valtype[0] === "i") {
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// create NumberLiteral global initializer
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return t.objectInstruction("const", globalType.valtype, [
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t.numberLiteralFromRaw(66)
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]);
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} else if (globalType.valtype[0] === "f") {
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// create FloatLiteral global initializer
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return t.objectInstruction("const", globalType.valtype, [
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t.floatLiteral(66, false, false, "66")
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]);
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} else {
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throw new Error("unknown type: " + globalType.valtype);
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}
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};
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/**
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* Rewrite the import globals:
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* - removes the ModuleImport instruction
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* - injects at the same offset a mutable global of the same type
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*
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* Since the imported globals are before the other global declarations, our
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* indices will be preserved.
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*
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* Note that globals will become mutable.
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*
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* @param {Object} state unused state
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* @returns {ArrayBufferTransform} transform
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*/
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const rewriteImportedGlobals = state => bin => {
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const additionalInitCode = state.additionalInitCode;
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const newGlobals = [];
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bin = editWithAST(state.ast, bin, {
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ModuleImport(path) {
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if (t.isGlobalType(path.node.descr)) {
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const globalType = path.node.descr;
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globalType.mutability = "var";
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const init = [
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createDefaultInitForGlobal(globalType),
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t.instruction("end")
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];
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newGlobals.push(t.global(globalType, init));
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path.remove();
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}
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},
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// in order to preserve non-imported global's order we need to re-inject
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// those as well
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Global(path) {
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const { node } = path;
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const [init] = node.init;
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if (init.id === "get_global") {
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node.globalType.mutability = "var";
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const initialGlobalidx = init.args[0];
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node.init = [
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createDefaultInitForGlobal(node.globalType),
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t.instruction("end")
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];
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additionalInitCode.push(
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/**
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* get_global in global initializer only works for imported globals.
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* They have the same indices as the init params, so use the
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* same index.
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*/
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t.instruction("get_local", [initialGlobalidx]),
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t.instruction("set_global", [t.indexLiteral(newGlobals.length)])
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);
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}
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newGlobals.push(node);
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path.remove();
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}
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});
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// Add global declaration instructions
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return addWithAST(state.ast, bin, newGlobals);
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};
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/**
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* Rewrite the export names
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* @param {Object} state state
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* @param {Object} state.ast Module's ast
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* @param {Module} state.module Module
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* @param {Set<string>} state.externalExports Module
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* @returns {ArrayBufferTransform} transform
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*/
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const rewriteExportNames = ({ ast, module, externalExports }) => bin => {
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return editWithAST(ast, bin, {
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ModuleExport(path) {
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const isExternal = externalExports.has(path.node.name);
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if (isExternal) {
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path.remove();
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return;
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}
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const usedName = module.isUsed(path.node.name);
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if (!usedName) {
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path.remove();
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return;
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}
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path.node.name = usedName;
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}
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});
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};
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/**
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* Mangle import names and modules
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* @param {Object} state state
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* @param {Object} state.ast Module's ast
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* @param {Map<string, UsedWasmDependency>} state.usedDependencyMap mappings to mangle names
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* @returns {ArrayBufferTransform} transform
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*/
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const rewriteImports = ({ ast, usedDependencyMap }) => bin => {
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return editWithAST(ast, bin, {
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ModuleImport(path) {
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const result = usedDependencyMap.get(
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path.node.module + ":" + path.node.name
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);
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if (result !== undefined) {
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path.node.module = result.module;
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path.node.name = result.name;
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}
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}
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});
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};
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/**
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* Add an init function.
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*
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* The init function fills the globals given input arguments.
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*
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* @param {Object} state transformation state
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* @param {Object} state.ast Module's ast
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* @param {t.Identifier} state.initFuncId identifier of the init function
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* @param {t.Index} state.startAtFuncOffset index of the start function
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* @param {t.ModuleImport[]} state.importedGlobals list of imported globals
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* @param {t.Instruction[]} state.additionalInitCode list of addition instructions for the init function
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* @param {t.Index} state.nextFuncIndex index of the next function
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* @param {t.Index} state.nextTypeIndex index of the next type
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* @returns {ArrayBufferTransform} transform
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*/
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const addInitFunction = ({
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ast,
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initFuncId,
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startAtFuncOffset,
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importedGlobals,
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additionalInitCode,
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nextFuncIndex,
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nextTypeIndex
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}) => bin => {
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const funcParams = importedGlobals.map(importedGlobal => {
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// used for debugging
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const id = t.identifier(`${importedGlobal.module}.${importedGlobal.name}`);
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return t.funcParam(importedGlobal.descr.valtype, id);
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});
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const funcBody = importedGlobals.reduce((acc, importedGlobal, index) => {
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const args = [t.indexLiteral(index)];
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const body = [
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t.instruction("get_local", args),
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t.instruction("set_global", args)
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];
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return [...acc, ...body];
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}, []);
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if (typeof startAtFuncOffset === "number") {
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funcBody.push(t.callInstruction(t.numberLiteralFromRaw(startAtFuncOffset)));
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}
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for (const instr of additionalInitCode) {
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funcBody.push(instr);
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}
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funcBody.push(t.instruction("end"));
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const funcResults = [];
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// Code section
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const funcSignature = t.signature(funcParams, funcResults);
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const func = t.func(initFuncId, funcSignature, funcBody);
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// Type section
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const functype = t.typeInstruction(undefined, funcSignature);
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// Func section
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const funcindex = t.indexInFuncSection(nextTypeIndex);
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// Export section
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const moduleExport = t.moduleExport(
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initFuncId.value,
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t.moduleExportDescr("Func", nextFuncIndex)
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);
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return addWithAST(ast, bin, [func, moduleExport, funcindex, functype]);
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};
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/**
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* Extract mangle mappings from module
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* @param {Module} module current module
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* @param {boolean} mangle mangle imports
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* @returns {Map<string, UsedWasmDependency>} mappings to mangled names
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*/
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const getUsedDependencyMap = (module, mangle) => {
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/** @type {Map<string, UsedWasmDependency>} */
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const map = new Map();
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for (const usedDep of WebAssemblyUtils.getUsedDependencies(module, mangle)) {
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const dep = usedDep.dependency;
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const request = dep.request;
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const exportName = dep.name;
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map.set(request + ":" + exportName, usedDep);
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}
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return map;
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};
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class WebAssemblyGenerator extends Generator {
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constructor(options) {
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super();
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this.options = options;
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}
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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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let bin = module.originalSource().source();
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const initFuncId = t.identifier(
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Array.isArray(module.usedExports)
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? Template.numberToIdentifer(module.usedExports.length)
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: "__webpack_init__"
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);
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// parse it
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const ast = decode(bin, {
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ignoreDataSection: true,
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ignoreCodeSection: true,
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ignoreCustomNameSection: true
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});
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const moduleContext = moduleContextFromModuleAST(ast.body[0]);
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const importedGlobals = getImportedGlobals(ast);
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const countImportedFunc = getCountImportedFunc(ast);
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const startAtFuncOffset = moduleContext.getStart();
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const nextFuncIndex = getNextFuncIndex(ast, countImportedFunc);
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const nextTypeIndex = getNextTypeIndex(ast);
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const usedDependencyMap = getUsedDependencyMap(
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module,
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this.options.mangleImports
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);
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const externalExports = new Set(
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module.dependencies
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.filter(d => d instanceof WebAssemblyExportImportedDependency)
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.map(d => {
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const wasmDep = /** @type {WebAssemblyExportImportedDependency} */ (d);
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return wasmDep.exportName;
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})
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);
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/** @type {t.Instruction[]} */
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const additionalInitCode = [];
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const transform = compose(
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rewriteExportNames({
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ast,
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module,
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externalExports
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}),
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removeStartFunc({ ast }),
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rewriteImportedGlobals({ ast, additionalInitCode }),
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rewriteImports({
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ast,
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usedDependencyMap
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}),
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addInitFunction({
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ast,
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initFuncId,
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importedGlobals,
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additionalInitCode,
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startAtFuncOffset,
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nextFuncIndex,
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nextTypeIndex
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})
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);
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const newBin = transform(bin);
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return new RawSource(newBin);
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}
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}
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module.exports = WebAssemblyGenerator;
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