1 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); } }
3 import * as leb from "@webassemblyjs/leb128";
4 import * as ieee754 from "@webassemblyjs/ieee754";
5 import * as utf8 from "@webassemblyjs/utf8";
6 import constants from "@webassemblyjs/helper-wasm-bytecode";
7 import { encodeNode } from "../index";
9 function assertNotIdentifierNode(n) {
10 if (n.type === "Identifier") {
11 throw new Error("Unsupported node Identifier");
15 export function encodeVersion(v) {
16 var bytes = constants.moduleVersion;
20 export function encodeHeader() {
21 return constants.magicModuleHeader;
23 export function encodeU32(v) {
24 var uint8view = new Uint8Array(leb.encodeU32(v));
26 var array = _toConsumableArray(uint8view);
30 export function encodeI32(v) {
31 var uint8view = new Uint8Array(leb.encodeI32(v));
33 var array = _toConsumableArray(uint8view);
37 export function encodeI64(v) {
38 var uint8view = new Uint8Array(leb.encodeI64(v));
40 var array = _toConsumableArray(uint8view);
44 export function encodeVec(elements) {
45 var size = encodeU32(elements.length);
46 return _toConsumableArray(size).concat(_toConsumableArray(elements));
48 export function encodeValtype(v) {
49 var byte = constants.valtypesByString[v];
51 if (typeof byte === "undefined") {
52 throw new Error("Unknown valtype: " + v);
55 return parseInt(byte, 10);
57 export function encodeMutability(v) {
58 var byte = constants.globalTypesByString[v];
60 if (typeof byte === "undefined") {
61 throw new Error("Unknown mutability: " + v);
64 return parseInt(byte, 10);
66 export function encodeUTF8Vec(str) {
67 return encodeVec(utf8.encode(str));
69 export function encodeLimits(n) {
72 if (typeof n.max === "number") {
74 out.push.apply(out, _toConsumableArray(encodeU32(n.min))); // $FlowIgnore: ensured by the typeof
76 out.push.apply(out, _toConsumableArray(encodeU32(n.max)));
79 out.push.apply(out, _toConsumableArray(encodeU32(n.min)));
84 export function encodeModuleImport(n) {
86 out.push.apply(out, _toConsumableArray(encodeUTF8Vec(n.module)));
87 out.push.apply(out, _toConsumableArray(encodeUTF8Vec(n.name)));
89 switch (n.descr.type) {
92 out.push(0x03); // $FlowIgnore: GlobalType ensure that these props exists
94 out.push(encodeValtype(n.descr.valtype)); // $FlowIgnore: GlobalType ensure that these props exists
96 out.push(encodeMutability(n.descr.mutability));
102 out.push(0x02); // $FlowIgnore
104 out.push.apply(out, _toConsumableArray(encodeLimits(n.descr.limits)));
111 out.push(0x70); // element type
114 out.push.apply(out, _toConsumableArray(encodeLimits(n.descr.limits)));
118 case "FuncImportDescr":
120 out.push(0x00); // $FlowIgnore
122 assertNotIdentifierNode(n.descr.id); // $FlowIgnore
124 out.push.apply(out, _toConsumableArray(encodeU32(n.descr.id.value)));
129 throw new Error("Unsupport operation: encode module import of type: " + n.descr.type);
134 export function encodeSectionMetadata(n) {
136 var sectionId = constants.sections[n.section];
138 if (typeof sectionId === "undefined") {
139 throw new Error("Unknown section: " + n.section);
142 if (n.section === "start") {
144 * This is not implemented yet because it's a special case which
145 * doesn't have a vector in its section.
147 throw new Error("Unsupported section encoding of type start");
151 out.push.apply(out, _toConsumableArray(encodeU32(n.size.value)));
152 out.push.apply(out, _toConsumableArray(encodeU32(n.vectorOfSize.value)));
155 export function encodeCallInstruction(n) {
157 assertNotIdentifierNode(n.index);
158 out.push(0x10); // $FlowIgnore
160 out.push.apply(out, _toConsumableArray(encodeU32(n.index.value)));
163 export function encodeCallIndirectInstruction(n) {
164 var out = []; // $FlowIgnore
166 assertNotIdentifierNode(n.index);
167 out.push(0x11); // $FlowIgnore
169 out.push.apply(out, _toConsumableArray(encodeU32(n.index.value))); // add a reserved byte
174 export function encodeModuleExport(n) {
176 assertNotIdentifierNode(n.descr.id);
177 var exportTypeByteString = constants.exportTypesByName[n.descr.exportType];
179 if (typeof exportTypeByteString === "undefined") {
180 throw new Error("Unknown export of type: " + n.descr.exportType);
183 var exportTypeByte = parseInt(exportTypeByteString, 10);
184 out.push.apply(out, _toConsumableArray(encodeUTF8Vec(n.name)));
185 out.push(exportTypeByte); // $FlowIgnore
187 out.push.apply(out, _toConsumableArray(encodeU32(n.descr.id.value)));
190 export function encodeTypeInstruction(n) {
192 var params = n.functype.params.map(function (x) {
194 }).map(encodeValtype);
195 var results = n.functype.results.map(encodeValtype);
196 out.push.apply(out, _toConsumableArray(encodeVec(params)));
197 out.push.apply(out, _toConsumableArray(encodeVec(results)));
200 export function encodeInstr(n) {
202 var instructionName = n.id;
204 if (typeof n.object === "string") {
205 instructionName = "".concat(n.object, ".").concat(String(n.id));
208 var byteString = constants.symbolsByName[instructionName];
210 if (typeof byteString === "undefined") {
211 throw new Error("encodeInstr: unknown instruction " + JSON.stringify(instructionName));
214 var byte = parseInt(byteString, 10);
218 n.args.forEach(function (arg) {
219 var encoder = encodeU32; // find correct encoder
221 if (n.object === "i32") {
225 if (n.object === "i64") {
229 if (n.object === "f32") {
230 encoder = ieee754.encodeF32;
233 if (n.object === "f64") {
234 encoder = ieee754.encodeF64;
237 if (arg.type === "NumberLiteral" || arg.type === "FloatLiteral" || arg.type === "LongNumberLiteral") {
239 out.push.apply(out, _toConsumableArray(encoder(arg.value)));
241 throw new Error("Unsupported instruction argument encoding " + JSON.stringify(arg.type));
249 function encodeExpr(instrs) {
251 instrs.forEach(function (instr) {
253 var n = encodeNode(instr);
254 out.push.apply(out, _toConsumableArray(n));
259 export function encodeStringLiteral(n) {
260 return encodeUTF8Vec(n.value);
262 export function encodeGlobal(n) {
264 var _n$globalType = n.globalType,
265 valtype = _n$globalType.valtype,
266 mutability = _n$globalType.mutability;
267 out.push(encodeValtype(valtype));
268 out.push(encodeMutability(mutability));
269 out.push.apply(out, _toConsumableArray(encodeExpr(n.init)));
272 export function encodeFuncBody(n) {
274 out.push(-1); // temporary function body size
275 // FIXME(sven): get the func locals?
277 var localBytes = encodeVec([]);
278 out.push.apply(out, _toConsumableArray(localBytes));
279 var funcBodyBytes = encodeExpr(n.body);
280 out[0] = funcBodyBytes.length + localBytes.length;
281 out.push.apply(out, _toConsumableArray(funcBodyBytes));
284 export function encodeIndexInFuncSection(n) {
285 assertNotIdentifierNode(n.index); // $FlowIgnore
287 return encodeU32(n.index.value);
289 export function encodeElem(n) {
291 assertNotIdentifierNode(n.table); // $FlowIgnore
293 out.push.apply(out, _toConsumableArray(encodeU32(n.table.value)));
294 out.push.apply(out, _toConsumableArray(encodeExpr(n.offset))); // $FlowIgnore
296 var funcs = n.funcs.reduce(function (acc, x) {
297 return _toConsumableArray(acc).concat(_toConsumableArray(encodeU32(x.value)));
299 out.push.apply(out, _toConsumableArray(encodeVec(funcs)));