1 | function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
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2 |
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3 | function _sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }
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4 |
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5 | function _slicedToArray(arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return _sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }
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6 |
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7 | import { isBlock, isFunc, isIdentifier, numberLiteralFromRaw, traverse } from "../../index";
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8 | import { moduleContextFromModuleAST } from "../ast-module-to-module-context"; // FIXME(sven): do the same with all block instructions, must be more generic here
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9 |
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10 | function newUnexpectedFunction(i) {
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11 | return new Error("unknown function at offset: " + i);
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12 | }
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13 |
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14 | export function transform(ast) {
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15 | var module;
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16 | traverse(ast, {
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17 | Module: function (_Module) {
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18 | function Module(_x) {
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19 | return _Module.apply(this, arguments);
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20 | }
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21 |
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22 | Module.toString = function () {
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23 | return _Module.toString();
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24 | };
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25 |
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26 | return Module;
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27 | }(function (path) {
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28 | module = path.node;
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29 | })
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30 | });
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31 | var moduleContext = moduleContextFromModuleAST(module); // Transform the actual instruction in function bodies
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32 |
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33 | traverse(ast, {
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34 | Func: function (_Func) {
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35 | function Func(_x2) {
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36 | return _Func.apply(this, arguments);
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37 | }
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38 |
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39 | Func.toString = function () {
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40 | return _Func.toString();
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41 | };
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42 |
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43 | return Func;
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44 | }(function (path) {
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45 | transformFuncPath(path, moduleContext);
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46 | }),
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47 | Start: function (_Start) {
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48 | function Start(_x3) {
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49 | return _Start.apply(this, arguments);
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50 | }
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51 |
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52 | Start.toString = function () {
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53 | return _Start.toString();
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54 | };
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55 |
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56 | return Start;
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57 | }(function (path) {
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58 | var index = path.node.index;
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59 |
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60 | if (isIdentifier(index) === true) {
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61 | var offsetInModule = moduleContext.getFunctionOffsetByIdentifier(index.value);
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62 |
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63 | if (typeof offsetInModule === "undefined") {
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64 | throw newUnexpectedFunction(index.value);
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65 | } // Replace the index Identifier
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66 | // $FlowIgnore: reference?
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67 |
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68 |
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69 | path.node.index = numberLiteralFromRaw(offsetInModule);
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70 | }
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71 | })
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72 | });
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73 | }
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74 |
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75 | function transformFuncPath(funcPath, moduleContext) {
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76 | var funcNode = funcPath.node;
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77 | var signature = funcNode.signature;
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78 |
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79 | if (signature.type !== "Signature") {
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80 | throw new Error("Function signatures must be denormalised before execution");
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81 | }
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82 |
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83 | var params = signature.params; // Add func locals in the context
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84 |
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85 | params.forEach(function (p) {
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86 | return moduleContext.addLocal(p.valtype);
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87 | });
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88 | traverse(funcNode, {
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89 | Instr: function (_Instr) {
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90 | function Instr(_x4) {
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91 | return _Instr.apply(this, arguments);
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92 | }
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93 |
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94 | Instr.toString = function () {
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95 | return _Instr.toString();
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96 | };
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97 |
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98 | return Instr;
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99 | }(function (instrPath) {
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100 | var instrNode = instrPath.node;
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101 | /**
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102 | * Local access
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103 | */
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104 |
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105 | if (instrNode.id === "get_local" || instrNode.id === "set_local" || instrNode.id === "tee_local") {
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106 | var _instrNode$args = _slicedToArray(instrNode.args, 1),
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107 | firstArg = _instrNode$args[0];
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108 |
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109 | if (firstArg.type === "Identifier") {
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110 | var offsetInParams = params.findIndex(function (_ref) {
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111 | var id = _ref.id;
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112 | return id === firstArg.value;
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113 | });
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114 |
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115 | if (offsetInParams === -1) {
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116 | throw new Error("".concat(firstArg.value, " not found in ").concat(instrNode.id, ": not declared in func params"));
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117 | } // Replace the Identifer node by our new NumberLiteral node
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118 |
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119 |
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120 | instrNode.args[0] = numberLiteralFromRaw(offsetInParams);
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121 | }
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122 | }
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123 | /**
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124 | * Global access
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125 | */
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126 |
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127 |
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128 | if (instrNode.id === "get_global" || instrNode.id === "set_global") {
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129 | var _instrNode$args2 = _slicedToArray(instrNode.args, 1),
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130 | _firstArg = _instrNode$args2[0];
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131 |
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132 | if (isIdentifier(_firstArg) === true) {
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133 | var globalOffset = moduleContext.getGlobalOffsetByIdentifier( // $FlowIgnore: reference?
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134 | _firstArg.value);
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135 |
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136 | if (typeof globalOffset === "undefined") {
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137 | // $FlowIgnore: reference?
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138 | throw new Error("global ".concat(_firstArg.value, " not found in module"));
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139 | } // Replace the Identifer node by our new NumberLiteral node
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140 |
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141 |
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142 | instrNode.args[0] = numberLiteralFromRaw(globalOffset);
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143 | }
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144 | }
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145 | /**
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146 | * Labels lookup
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147 | */
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148 |
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149 |
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150 | if (instrNode.id === "br") {
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151 | var _instrNode$args3 = _slicedToArray(instrNode.args, 1),
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152 | _firstArg2 = _instrNode$args3[0];
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153 |
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154 | if (isIdentifier(_firstArg2) === true) {
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155 | // if the labels is not found it is going to be replaced with -1
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156 | // which is invalid.
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157 | var relativeBlockCount = -1; // $FlowIgnore: reference?
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158 |
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159 | instrPath.findParent(function (_ref2) {
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160 | var node = _ref2.node;
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161 |
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162 | if (isBlock(node)) {
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163 | relativeBlockCount++; // $FlowIgnore: reference?
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164 |
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165 | var name = node.label || node.name;
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166 |
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167 | if (_typeof(name) === "object") {
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168 | // $FlowIgnore: isIdentifier ensures that
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169 | if (name.value === _firstArg2.value) {
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170 | // Found it
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171 | return false;
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172 | }
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173 | }
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174 | }
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175 |
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176 | if (isFunc(node)) {
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177 | return false;
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178 | }
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179 | }); // Replace the Identifer node by our new NumberLiteral node
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180 |
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181 | instrNode.args[0] = numberLiteralFromRaw(relativeBlockCount);
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182 | }
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183 | }
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184 | }),
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185 |
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186 | /**
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187 | * Func lookup
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188 | */
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189 | CallInstruction: function (_CallInstruction) {
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190 | function CallInstruction(_x5) {
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191 | return _CallInstruction.apply(this, arguments);
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192 | }
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193 |
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194 | CallInstruction.toString = function () {
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195 | return _CallInstruction.toString();
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196 | };
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197 |
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198 | return CallInstruction;
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199 | }(function (_ref3) {
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200 | var node = _ref3.node;
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201 | var index = node.index;
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202 |
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203 | if (isIdentifier(index) === true) {
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204 | var offsetInModule = moduleContext.getFunctionOffsetByIdentifier(index.value);
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205 |
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206 | if (typeof offsetInModule === "undefined") {
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207 | throw newUnexpectedFunction(index.value);
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208 | } // Replace the index Identifier
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209 | // $FlowIgnore: reference?
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210 |
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211 |
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212 | node.index = numberLiteralFromRaw(offsetInModule);
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213 | }
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214 | })
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215 | });
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216 | } |
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