[6a3a178] | 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); } }
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| 2 |
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| 3 | import * as leb from "@webassemblyjs/leb128";
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| 4 | import * as ieee754 from "@webassemblyjs/ieee754";
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| 5 | import * as utf8 from "@webassemblyjs/utf8";
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| 6 | import constants from "@webassemblyjs/helper-wasm-bytecode";
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| 7 | import { encodeNode } from "../index";
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| 8 |
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| 9 | function assertNotIdentifierNode(n) {
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| 10 | if (n.type === "Identifier") {
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| 11 | throw new Error("Unsupported node Identifier");
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| 12 | }
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| 13 | }
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| 14 |
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| 15 | export function encodeVersion(v) {
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| 16 | var bytes = constants.moduleVersion;
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| 17 | bytes[0] = v;
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| 18 | return bytes;
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| 19 | }
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| 20 | export function encodeHeader() {
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| 21 | return constants.magicModuleHeader;
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| 22 | }
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| 23 | export function encodeU32(v) {
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| 24 | var uint8view = new Uint8Array(leb.encodeU32(v));
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| 25 |
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| 26 | var array = _toConsumableArray(uint8view);
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| 27 |
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| 28 | return array;
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| 29 | }
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| 30 | export function encodeI32(v) {
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| 31 | var uint8view = new Uint8Array(leb.encodeI32(v));
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| 32 |
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| 33 | var array = _toConsumableArray(uint8view);
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| 34 |
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| 35 | return array;
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| 36 | }
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| 37 | export function encodeI64(v) {
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| 38 | var uint8view = new Uint8Array(leb.encodeI64(v));
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| 39 |
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| 40 | var array = _toConsumableArray(uint8view);
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| 41 |
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| 42 | return array;
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| 43 | }
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| 44 | export function encodeVec(elements) {
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| 45 | var size = encodeU32(elements.length);
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| 46 | return _toConsumableArray(size).concat(_toConsumableArray(elements));
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| 47 | }
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| 48 | export function encodeValtype(v) {
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| 49 | var byte = constants.valtypesByString[v];
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| 50 |
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| 51 | if (typeof byte === "undefined") {
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| 52 | throw new Error("Unknown valtype: " + v);
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| 53 | }
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| 54 |
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| 55 | return parseInt(byte, 10);
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| 56 | }
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| 57 | export function encodeMutability(v) {
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| 58 | var byte = constants.globalTypesByString[v];
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| 59 |
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| 60 | if (typeof byte === "undefined") {
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| 61 | throw new Error("Unknown mutability: " + v);
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| 62 | }
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| 63 |
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| 64 | return parseInt(byte, 10);
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| 65 | }
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| 66 | export function encodeUTF8Vec(str) {
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| 67 | return encodeVec(utf8.encode(str));
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| 68 | }
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| 69 | export function encodeLimits(n) {
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| 70 | var out = [];
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| 71 |
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| 72 | if (typeof n.max === "number") {
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| 73 | out.push(0x01);
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| 74 | out.push.apply(out, _toConsumableArray(encodeU32(n.min))); // $FlowIgnore: ensured by the typeof
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| 75 |
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| 76 | out.push.apply(out, _toConsumableArray(encodeU32(n.max)));
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| 77 | } else {
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| 78 | out.push(0x00);
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| 79 | out.push.apply(out, _toConsumableArray(encodeU32(n.min)));
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| 80 | }
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| 81 |
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| 82 | return out;
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| 83 | }
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| 84 | export function encodeModuleImport(n) {
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| 85 | var out = [];
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| 86 | out.push.apply(out, _toConsumableArray(encodeUTF8Vec(n.module)));
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| 87 | out.push.apply(out, _toConsumableArray(encodeUTF8Vec(n.name)));
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| 88 |
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| 89 | switch (n.descr.type) {
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| 90 | case "GlobalType":
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| 91 | {
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| 92 | out.push(0x03); // $FlowIgnore: GlobalType ensure that these props exists
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| 93 |
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| 94 | out.push(encodeValtype(n.descr.valtype)); // $FlowIgnore: GlobalType ensure that these props exists
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| 95 |
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| 96 | out.push(encodeMutability(n.descr.mutability));
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| 97 | break;
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| 98 | }
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| 99 |
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| 100 | case "Memory":
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| 101 | {
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| 102 | out.push(0x02); // $FlowIgnore
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| 103 |
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| 104 | out.push.apply(out, _toConsumableArray(encodeLimits(n.descr.limits)));
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| 105 | break;
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| 106 | }
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| 107 |
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| 108 | case "Table":
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| 109 | {
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| 110 | out.push(0x01);
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| 111 | out.push(0x70); // element type
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| 112 | // $FlowIgnore
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| 113 |
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| 114 | out.push.apply(out, _toConsumableArray(encodeLimits(n.descr.limits)));
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| 115 | break;
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| 116 | }
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| 117 |
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| 118 | case "FuncImportDescr":
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| 119 | {
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| 120 | out.push(0x00); // $FlowIgnore
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| 121 |
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| 122 | assertNotIdentifierNode(n.descr.id); // $FlowIgnore
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| 123 |
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| 124 | out.push.apply(out, _toConsumableArray(encodeU32(n.descr.id.value)));
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| 125 | break;
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| 126 | }
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| 127 |
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| 128 | default:
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| 129 | throw new Error("Unsupport operation: encode module import of type: " + n.descr.type);
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| 130 | }
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| 131 |
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| 132 | return out;
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| 133 | }
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| 134 | export function encodeSectionMetadata(n) {
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| 135 | var out = [];
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| 136 | var sectionId = constants.sections[n.section];
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| 137 |
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| 138 | if (typeof sectionId === "undefined") {
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| 139 | throw new Error("Unknown section: " + n.section);
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| 140 | }
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| 141 |
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| 142 | if (n.section === "start") {
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| 143 | /**
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| 144 | * This is not implemented yet because it's a special case which
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| 145 | * doesn't have a vector in its section.
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| 146 | */
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| 147 | throw new Error("Unsupported section encoding of type start");
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| 148 | }
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| 149 |
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| 150 | out.push(sectionId);
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| 151 | out.push.apply(out, _toConsumableArray(encodeU32(n.size.value)));
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| 152 | out.push.apply(out, _toConsumableArray(encodeU32(n.vectorOfSize.value)));
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| 153 | return out;
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| 154 | }
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| 155 | export function encodeCallInstruction(n) {
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| 156 | var out = [];
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| 157 | assertNotIdentifierNode(n.index);
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| 158 | out.push(0x10); // $FlowIgnore
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| 159 |
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| 160 | out.push.apply(out, _toConsumableArray(encodeU32(n.index.value)));
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| 161 | return out;
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| 162 | }
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| 163 | export function encodeCallIndirectInstruction(n) {
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| 164 | var out = []; // $FlowIgnore
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| 165 |
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| 166 | assertNotIdentifierNode(n.index);
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| 167 | out.push(0x11); // $FlowIgnore
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| 168 |
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| 169 | out.push.apply(out, _toConsumableArray(encodeU32(n.index.value))); // add a reserved byte
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| 170 |
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| 171 | out.push(0x00);
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| 172 | return out;
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| 173 | }
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| 174 | export function encodeModuleExport(n) {
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| 175 | var out = [];
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| 176 | assertNotIdentifierNode(n.descr.id);
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| 177 | var exportTypeByteString = constants.exportTypesByName[n.descr.exportType];
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| 178 |
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| 179 | if (typeof exportTypeByteString === "undefined") {
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| 180 | throw new Error("Unknown export of type: " + n.descr.exportType);
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| 181 | }
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| 182 |
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| 183 | var exportTypeByte = parseInt(exportTypeByteString, 10);
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| 184 | out.push.apply(out, _toConsumableArray(encodeUTF8Vec(n.name)));
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| 185 | out.push(exportTypeByte); // $FlowIgnore
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| 186 |
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| 187 | out.push.apply(out, _toConsumableArray(encodeU32(n.descr.id.value)));
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| 188 | return out;
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| 189 | }
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| 190 | export function encodeTypeInstruction(n) {
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| 191 | var out = [0x60];
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| 192 | var params = n.functype.params.map(function (x) {
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| 193 | return x.valtype;
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| 194 | }).map(encodeValtype);
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| 195 | var results = n.functype.results.map(encodeValtype);
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| 196 | out.push.apply(out, _toConsumableArray(encodeVec(params)));
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| 197 | out.push.apply(out, _toConsumableArray(encodeVec(results)));
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| 198 | return out;
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| 199 | }
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| 200 | export function encodeInstr(n) {
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| 201 | var out = [];
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| 202 | var instructionName = n.id;
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| 203 |
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| 204 | if (typeof n.object === "string") {
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| 205 | instructionName = "".concat(n.object, ".").concat(String(n.id));
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| 206 | }
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| 207 |
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| 208 | var byteString = constants.symbolsByName[instructionName];
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| 209 |
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| 210 | if (typeof byteString === "undefined") {
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| 211 | throw new Error("encodeInstr: unknown instruction " + JSON.stringify(instructionName));
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| 212 | }
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| 213 |
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| 214 | var byte = parseInt(byteString, 10);
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| 215 | out.push(byte);
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| 216 |
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| 217 | if (n.args) {
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| 218 | n.args.forEach(function (arg) {
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| 219 | var encoder = encodeU32; // find correct encoder
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| 220 |
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| 221 | if (n.object === "i32") {
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| 222 | encoder = encodeI32;
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| 223 | }
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| 224 |
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| 225 | if (n.object === "i64") {
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| 226 | encoder = encodeI64;
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| 227 | }
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| 228 |
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| 229 | if (n.object === "f32") {
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| 230 | encoder = ieee754.encodeF32;
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| 231 | }
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| 232 |
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| 233 | if (n.object === "f64") {
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| 234 | encoder = ieee754.encodeF64;
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| 235 | }
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| 236 |
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| 237 | if (arg.type === "NumberLiteral" || arg.type === "FloatLiteral" || arg.type === "LongNumberLiteral") {
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| 238 | // $FlowIgnore
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| 239 | out.push.apply(out, _toConsumableArray(encoder(arg.value)));
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| 240 | } else {
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| 241 | throw new Error("Unsupported instruction argument encoding " + JSON.stringify(arg.type));
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| 242 | }
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| 243 | });
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| 244 | }
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| 245 |
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| 246 | return out;
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| 247 | }
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| 248 |
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| 249 | function encodeExpr(instrs) {
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| 250 | var out = [];
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| 251 | instrs.forEach(function (instr) {
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| 252 | // $FlowIgnore
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| 253 | var n = encodeNode(instr);
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| 254 | out.push.apply(out, _toConsumableArray(n));
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| 255 | });
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| 256 | return out;
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| 257 | }
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| 258 |
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| 259 | export function encodeStringLiteral(n) {
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| 260 | return encodeUTF8Vec(n.value);
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| 261 | }
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| 262 | export function encodeGlobal(n) {
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| 263 | var out = [];
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| 264 | var _n$globalType = n.globalType,
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| 265 | valtype = _n$globalType.valtype,
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| 266 | mutability = _n$globalType.mutability;
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| 267 | out.push(encodeValtype(valtype));
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| 268 | out.push(encodeMutability(mutability));
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| 269 | out.push.apply(out, _toConsumableArray(encodeExpr(n.init)));
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| 270 | return out;
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| 271 | }
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| 272 | export function encodeFuncBody(n) {
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| 273 | var out = [];
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| 274 | out.push(-1); // temporary function body size
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| 275 | // FIXME(sven): get the func locals?
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| 276 |
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| 277 | var localBytes = encodeVec([]);
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| 278 | out.push.apply(out, _toConsumableArray(localBytes));
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| 279 | var funcBodyBytes = encodeExpr(n.body);
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| 280 | out[0] = funcBodyBytes.length + localBytes.length;
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| 281 | out.push.apply(out, _toConsumableArray(funcBodyBytes));
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| 282 | return out;
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| 283 | }
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| 284 | export function encodeIndexInFuncSection(n) {
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| 285 | assertNotIdentifierNode(n.index); // $FlowIgnore
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| 286 |
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| 287 | return encodeU32(n.index.value);
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| 288 | }
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| 289 | export function encodeElem(n) {
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| 290 | var out = [];
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| 291 | assertNotIdentifierNode(n.table); // $FlowIgnore
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| 292 |
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| 293 | out.push.apply(out, _toConsumableArray(encodeU32(n.table.value)));
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| 294 | out.push.apply(out, _toConsumableArray(encodeExpr(n.offset))); // $FlowIgnore
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| 295 |
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| 296 | var funcs = n.funcs.reduce(function (acc, x) {
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| 297 | return _toConsumableArray(acc).concat(_toConsumableArray(encodeU32(x.value)));
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| 298 | }, []);
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| 299 | out.push.apply(out, _toConsumableArray(encodeVec(funcs)));
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| 300 | return out;
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| 301 | } |
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