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