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