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