301 lines
8.2 KiB
JavaScript
301 lines
8.2 KiB
JavaScript
function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }
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import * as leb from "@webassemblyjs/leb128";
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import * as ieee754 from "@webassemblyjs/ieee754";
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import * as utf8 from "@webassemblyjs/utf8";
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import constants from "@webassemblyjs/helper-wasm-bytecode";
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import { encodeNode } from "../index";
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function assertNotIdentifierNode(n) {
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if (n.type === "Identifier") {
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throw new Error("Unsupported node Identifier");
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}
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}
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export function encodeVersion(v) {
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var bytes = constants.moduleVersion;
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bytes[0] = v;
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return bytes;
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}
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export function encodeHeader() {
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return constants.magicModuleHeader;
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}
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export function encodeU32(v) {
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var uint8view = new Uint8Array(leb.encodeU32(v));
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var array = _toConsumableArray(uint8view);
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return array;
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}
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export function encodeI32(v) {
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var uint8view = new Uint8Array(leb.encodeI32(v));
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var array = _toConsumableArray(uint8view);
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return array;
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}
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export function encodeI64(v) {
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var uint8view = new Uint8Array(leb.encodeI64(v));
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var array = _toConsumableArray(uint8view);
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return array;
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}
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export function encodeVec(elements) {
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var size = encodeU32(elements.length);
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return _toConsumableArray(size).concat(_toConsumableArray(elements));
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}
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export function encodeValtype(v) {
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var byte = constants.valtypesByString[v];
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if (typeof byte === "undefined") {
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throw new Error("Unknown valtype: " + v);
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}
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return parseInt(byte, 10);
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}
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export function encodeMutability(v) {
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var byte = constants.globalTypesByString[v];
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if (typeof byte === "undefined") {
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throw new Error("Unknown mutability: " + v);
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}
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return parseInt(byte, 10);
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}
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export function encodeUTF8Vec(str) {
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return encodeVec(utf8.encode(str));
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}
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export function encodeLimits(n) {
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var out = [];
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if (typeof n.max === "number") {
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out.push(0x01);
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out.push.apply(out, _toConsumableArray(encodeU32(n.min))); // $FlowIgnore: ensured by the typeof
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out.push.apply(out, _toConsumableArray(encodeU32(n.max)));
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} else {
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out.push(0x00);
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out.push.apply(out, _toConsumableArray(encodeU32(n.min)));
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}
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return out;
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}
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export function encodeModuleImport(n) {
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var out = [];
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out.push.apply(out, _toConsumableArray(encodeUTF8Vec(n.module)));
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out.push.apply(out, _toConsumableArray(encodeUTF8Vec(n.name)));
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switch (n.descr.type) {
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case "GlobalType":
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{
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out.push(0x03); // $FlowIgnore: GlobalType ensure that these props exists
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out.push(encodeValtype(n.descr.valtype)); // $FlowIgnore: GlobalType ensure that these props exists
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out.push(encodeMutability(n.descr.mutability));
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break;
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}
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case "Memory":
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{
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out.push(0x02); // $FlowIgnore
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out.push.apply(out, _toConsumableArray(encodeLimits(n.descr.limits)));
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break;
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}
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case "Table":
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{
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out.push(0x01);
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out.push(0x70); // element type
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// $FlowIgnore
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out.push.apply(out, _toConsumableArray(encodeLimits(n.descr.limits)));
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break;
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}
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case "FuncImportDescr":
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{
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out.push(0x00); // $FlowIgnore
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assertNotIdentifierNode(n.descr.id); // $FlowIgnore
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out.push.apply(out, _toConsumableArray(encodeU32(n.descr.id.value)));
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break;
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}
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default:
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throw new Error("Unsupport operation: encode module import of type: " + n.descr.type);
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}
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return out;
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}
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export function encodeSectionMetadata(n) {
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var out = [];
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var sectionId = constants.sections[n.section];
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if (typeof sectionId === "undefined") {
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throw new Error("Unknown section: " + n.section);
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}
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if (n.section === "start") {
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/**
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* This is not implemented yet because it's a special case which
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* doesn't have a vector in its section.
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*/
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throw new Error("Unsupported section encoding of type start");
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}
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out.push(sectionId);
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out.push.apply(out, _toConsumableArray(encodeU32(n.size.value)));
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out.push.apply(out, _toConsumableArray(encodeU32(n.vectorOfSize.value)));
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return out;
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}
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export function encodeCallInstruction(n) {
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var out = [];
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assertNotIdentifierNode(n.index);
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out.push(0x10); // $FlowIgnore
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out.push.apply(out, _toConsumableArray(encodeU32(n.index.value)));
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return out;
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}
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export function encodeCallIndirectInstruction(n) {
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var out = []; // $FlowIgnore
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assertNotIdentifierNode(n.index);
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out.push(0x11); // $FlowIgnore
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out.push.apply(out, _toConsumableArray(encodeU32(n.index.value))); // add a reserved byte
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out.push(0x00);
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return out;
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}
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export function encodeModuleExport(n) {
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var out = [];
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assertNotIdentifierNode(n.descr.id);
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var exportTypeByteString = constants.exportTypesByName[n.descr.exportType];
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if (typeof exportTypeByteString === "undefined") {
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throw new Error("Unknown export of type: " + n.descr.exportType);
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}
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var exportTypeByte = parseInt(exportTypeByteString, 10);
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out.push.apply(out, _toConsumableArray(encodeUTF8Vec(n.name)));
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out.push(exportTypeByte); // $FlowIgnore
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out.push.apply(out, _toConsumableArray(encodeU32(n.descr.id.value)));
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return out;
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}
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export function encodeTypeInstruction(n) {
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var out = [0x60];
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var params = n.functype.params.map(function (x) {
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return x.valtype;
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}).map(encodeValtype);
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var results = n.functype.results.map(encodeValtype);
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out.push.apply(out, _toConsumableArray(encodeVec(params)));
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out.push.apply(out, _toConsumableArray(encodeVec(results)));
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return out;
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}
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export function encodeInstr(n) {
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var out = [];
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var instructionName = n.id;
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if (typeof n.object === "string") {
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instructionName = "".concat(n.object, ".").concat(String(n.id));
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}
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var byteString = constants.symbolsByName[instructionName];
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if (typeof byteString === "undefined") {
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throw new Error("encodeInstr: unknown instruction " + JSON.stringify(instructionName));
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}
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var byte = parseInt(byteString, 10);
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out.push(byte);
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if (n.args) {
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n.args.forEach(function (arg) {
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var encoder = encodeU32; // find correct encoder
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if (n.object === "i32") {
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encoder = encodeI32;
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}
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if (n.object === "i64") {
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encoder = encodeI64;
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}
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if (n.object === "f32") {
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encoder = ieee754.encodeF32;
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}
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if (n.object === "f64") {
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encoder = ieee754.encodeF64;
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}
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if (arg.type === "NumberLiteral" || arg.type === "FloatLiteral" || arg.type === "LongNumberLiteral") {
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// $FlowIgnore
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out.push.apply(out, _toConsumableArray(encoder(arg.value)));
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} else {
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throw new Error("Unsupported instruction argument encoding " + JSON.stringify(arg.type));
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}
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});
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}
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return out;
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}
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function encodeExpr(instrs) {
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var out = [];
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instrs.forEach(function (instr) {
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// $FlowIgnore
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var n = encodeNode(instr);
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out.push.apply(out, _toConsumableArray(n));
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});
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return out;
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}
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export function encodeStringLiteral(n) {
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return encodeUTF8Vec(n.value);
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}
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export function encodeGlobal(n) {
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var out = [];
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var _n$globalType = n.globalType,
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valtype = _n$globalType.valtype,
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mutability = _n$globalType.mutability;
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out.push(encodeValtype(valtype));
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out.push(encodeMutability(mutability));
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out.push.apply(out, _toConsumableArray(encodeExpr(n.init)));
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return out;
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}
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export function encodeFuncBody(n) {
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var out = [];
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out.push(-1); // temporary function body size
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// FIXME(sven): get the func locals?
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var localBytes = encodeVec([]);
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out.push.apply(out, _toConsumableArray(localBytes));
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var funcBodyBytes = encodeExpr(n.body);
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out[0] = funcBodyBytes.length + localBytes.length;
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out.push.apply(out, _toConsumableArray(funcBodyBytes));
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return out;
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}
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export function encodeIndexInFuncSection(n) {
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assertNotIdentifierNode(n.index); // $FlowIgnore
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return encodeU32(n.index.value);
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}
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export function encodeElem(n) {
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var out = [];
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assertNotIdentifierNode(n.table); // $FlowIgnore
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out.push.apply(out, _toConsumableArray(encodeU32(n.table.value)));
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out.push.apply(out, _toConsumableArray(encodeExpr(n.offset))); // $FlowIgnore
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var funcs = n.funcs.reduce(function (acc, x) {
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return _toConsumableArray(acc).concat(_toConsumableArray(encodeU32(x.value)));
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}, []);
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out.push.apply(out, _toConsumableArray(encodeVec(funcs)));
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return out;
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} |