1
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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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2
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3
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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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4
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5
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import { encodeNode } from "@webassemblyjs/wasm-gen";
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6
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import { encodeU32 } from "@webassemblyjs/wasm-gen/lib/encoder";
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7
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import { isFunc, isGlobal, assertHasLoc, orderedInsertNode, getSectionMetadata, traverse, getEndOfSection } from "@webassemblyjs/ast";
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8
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import { resizeSectionByteSize, resizeSectionVecSize, createEmptySection, removeSections } from "@webassemblyjs/helper-wasm-section";
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9
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import { overrideBytesInBuffer } from "@webassemblyjs/helper-buffer";
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10
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import { getSectionForNode } from "@webassemblyjs/helper-wasm-bytecode";
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11
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12
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function shiftLocNodeByDelta(node, delta) {
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13
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assertHasLoc(node); // $FlowIgnore: assertHasLoc ensures that
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14
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15
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node.loc.start.column += delta; // $FlowIgnore: assertHasLoc ensures that
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16
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17
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node.loc.end.column += delta;
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18
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}
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19
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20
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function applyUpdate(ast, uint8Buffer, _ref) {
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21
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var _ref2 = _slicedToArray(_ref, 2),
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22
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oldNode = _ref2[0],
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23
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newNode = _ref2[1];
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24
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25
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var deltaElements = 0;
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26
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assertHasLoc(oldNode);
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27
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var sectionName = getSectionForNode(newNode);
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28
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var replacementByteArray = encodeNode(newNode);
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29
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/**
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30
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* Replace new node as bytes
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31
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*/
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32
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33
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uint8Buffer = overrideBytesInBuffer(uint8Buffer, // $FlowIgnore: assertHasLoc ensures that
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34
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oldNode.loc.start.column, // $FlowIgnore: assertHasLoc ensures that
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35
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oldNode.loc.end.column, replacementByteArray);
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36
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/**
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37
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* Update function body size if needed
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38
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*/
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39
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|
40
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if (sectionName === "code") {
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41
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// Find the parent func
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42
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traverse(ast, {
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43
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Func: function Func(_ref3) {
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44
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var node = _ref3.node;
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45
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var funcHasThisIntr = node.body.find(function (n) {
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46
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return n === newNode;
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47
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}) !== undefined; // Update func's body size if needed
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48
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|
49
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if (funcHasThisIntr === true) {
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50
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// These are the old functions locations informations
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51
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assertHasLoc(node);
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52
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var oldNodeSize = encodeNode(oldNode).length;
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53
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var bodySizeDeltaBytes = replacementByteArray.length - oldNodeSize;
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54
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|
55
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if (bodySizeDeltaBytes !== 0) {
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56
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var newValue = node.metadata.bodySize + bodySizeDeltaBytes;
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var newByteArray = encodeU32(newValue); // function body size byte
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58
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// FIXME(sven): only handles one byte u32
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59
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|
60
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var start = node.loc.start.column;
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61
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var end = start + 1;
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62
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uint8Buffer = overrideBytesInBuffer(uint8Buffer, start, end, newByteArray);
|
63
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}
|
64
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}
|
65
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}
|
66
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});
|
67
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}
|
68
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/**
|
69
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* Update section size
|
70
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*/
|
71
|
|
72
|
|
73
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var deltaBytes = replacementByteArray.length - ( // $FlowIgnore: assertHasLoc ensures that
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74
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oldNode.loc.end.column - oldNode.loc.start.column); // Init location informations
|
75
|
|
76
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newNode.loc = {
|
77
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start: {
|
78
|
line: -1,
|
79
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column: -1
|
80
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},
|
81
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end: {
|
82
|
line: -1,
|
83
|
column: -1
|
84
|
}
|
85
|
}; // Update new node end position
|
86
|
// $FlowIgnore: assertHasLoc ensures that
|
87
|
|
88
|
newNode.loc.start.column = oldNode.loc.start.column; // $FlowIgnore: assertHasLoc ensures that
|
89
|
|
90
|
newNode.loc.end.column = // $FlowIgnore: assertHasLoc ensures that
|
91
|
oldNode.loc.start.column + replacementByteArray.length;
|
92
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return {
|
93
|
uint8Buffer: uint8Buffer,
|
94
|
deltaBytes: deltaBytes,
|
95
|
deltaElements: deltaElements
|
96
|
};
|
97
|
}
|
98
|
|
99
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function applyDelete(ast, uint8Buffer, node) {
|
100
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var deltaElements = -1; // since we removed an element
|
101
|
|
102
|
assertHasLoc(node);
|
103
|
var sectionName = getSectionForNode(node);
|
104
|
|
105
|
if (sectionName === "start") {
|
106
|
var sectionMetadata = getSectionMetadata(ast, "start");
|
107
|
/**
|
108
|
* The start section only contains one element,
|
109
|
* we need to remove the whole section
|
110
|
*/
|
111
|
|
112
|
uint8Buffer = removeSections(ast, uint8Buffer, "start");
|
113
|
|
114
|
var _deltaBytes = -(sectionMetadata.size.value + 1);
|
115
|
/* section id */
|
116
|
|
117
|
|
118
|
return {
|
119
|
uint8Buffer: uint8Buffer,
|
120
|
deltaBytes: _deltaBytes,
|
121
|
deltaElements: deltaElements
|
122
|
};
|
123
|
} // replacement is nothing
|
124
|
|
125
|
|
126
|
var replacement = [];
|
127
|
uint8Buffer = overrideBytesInBuffer(uint8Buffer, // $FlowIgnore: assertHasLoc ensures that
|
128
|
node.loc.start.column, // $FlowIgnore: assertHasLoc ensures that
|
129
|
node.loc.end.column, replacement);
|
130
|
/**
|
131
|
* Update section
|
132
|
*/
|
133
|
// $FlowIgnore: assertHasLoc ensures that
|
134
|
|
135
|
var deltaBytes = -(node.loc.end.column - node.loc.start.column);
|
136
|
return {
|
137
|
uint8Buffer: uint8Buffer,
|
138
|
deltaBytes: deltaBytes,
|
139
|
deltaElements: deltaElements
|
140
|
};
|
141
|
}
|
142
|
|
143
|
function applyAdd(ast, uint8Buffer, node) {
|
144
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var deltaElements = +1; // since we added an element
|
145
|
|
146
|
var sectionName = getSectionForNode(node);
|
147
|
var sectionMetadata = getSectionMetadata(ast, sectionName); // Section doesn't exists, we create an empty one
|
148
|
|
149
|
if (typeof sectionMetadata === "undefined") {
|
150
|
var res = createEmptySection(ast, uint8Buffer, sectionName);
|
151
|
uint8Buffer = res.uint8Buffer;
|
152
|
sectionMetadata = res.sectionMetadata;
|
153
|
}
|
154
|
/**
|
155
|
* check that the expressions were ended
|
156
|
*/
|
157
|
|
158
|
|
159
|
if (isFunc(node)) {
|
160
|
// $FlowIgnore
|
161
|
var body = node.body;
|
162
|
|
163
|
if (body.length === 0 || body[body.length - 1].id !== "end") {
|
164
|
throw new Error("expressions must be ended");
|
165
|
}
|
166
|
}
|
167
|
|
168
|
if (isGlobal(node)) {
|
169
|
// $FlowIgnore
|
170
|
var body = node.init;
|
171
|
|
172
|
if (body.length === 0 || body[body.length - 1].id !== "end") {
|
173
|
throw new Error("expressions must be ended");
|
174
|
}
|
175
|
}
|
176
|
/**
|
177
|
* Add nodes
|
178
|
*/
|
179
|
|
180
|
|
181
|
var newByteArray = encodeNode(node); // The size of the section doesn't include the storage of the size itself
|
182
|
// we need to manually add it here
|
183
|
|
184
|
var start = getEndOfSection(sectionMetadata);
|
185
|
var end = start;
|
186
|
/**
|
187
|
* Update section
|
188
|
*/
|
189
|
|
190
|
var deltaBytes = newByteArray.length;
|
191
|
uint8Buffer = overrideBytesInBuffer(uint8Buffer, start, end, newByteArray);
|
192
|
node.loc = {
|
193
|
start: {
|
194
|
line: -1,
|
195
|
column: start
|
196
|
},
|
197
|
end: {
|
198
|
line: -1,
|
199
|
column: start + deltaBytes
|
200
|
}
|
201
|
}; // for func add the additional metadata in the AST
|
202
|
|
203
|
if (node.type === "Func") {
|
204
|
// the size is the first byte
|
205
|
// FIXME(sven): handle LEB128 correctly here
|
206
|
var bodySize = newByteArray[0];
|
207
|
node.metadata = {
|
208
|
bodySize: bodySize
|
209
|
};
|
210
|
}
|
211
|
|
212
|
if (node.type !== "IndexInFuncSection") {
|
213
|
orderedInsertNode(ast.body[0], node);
|
214
|
}
|
215
|
|
216
|
return {
|
217
|
uint8Buffer: uint8Buffer,
|
218
|
deltaBytes: deltaBytes,
|
219
|
deltaElements: deltaElements
|
220
|
};
|
221
|
}
|
222
|
|
223
|
export function applyOperations(ast, uint8Buffer, ops) {
|
224
|
ops.forEach(function (op) {
|
225
|
var state;
|
226
|
var sectionName;
|
227
|
|
228
|
switch (op.kind) {
|
229
|
case "update":
|
230
|
state = applyUpdate(ast, uint8Buffer, [op.oldNode, op.node]);
|
231
|
sectionName = getSectionForNode(op.node);
|
232
|
break;
|
233
|
|
234
|
case "delete":
|
235
|
state = applyDelete(ast, uint8Buffer, op.node);
|
236
|
sectionName = getSectionForNode(op.node);
|
237
|
break;
|
238
|
|
239
|
case "add":
|
240
|
state = applyAdd(ast, uint8Buffer, op.node);
|
241
|
sectionName = getSectionForNode(op.node);
|
242
|
break;
|
243
|
|
244
|
default:
|
245
|
throw new Error("Unknown operation");
|
246
|
}
|
247
|
/**
|
248
|
* Resize section vec size.
|
249
|
* If the length of the LEB-encoded size changes, this can change
|
250
|
* the byte length of the section and the offset for nodes in the
|
251
|
* section. So we do this first before resizing section byte size
|
252
|
* or shifting following operations' nodes.
|
253
|
*/
|
254
|
|
255
|
|
256
|
if (state.deltaElements !== 0 && sectionName !== "start") {
|
257
|
var oldBufferLength = state.uint8Buffer.length;
|
258
|
state.uint8Buffer = resizeSectionVecSize(ast, state.uint8Buffer, sectionName, state.deltaElements); // Infer bytes added/removed by comparing buffer lengths
|
259
|
|
260
|
state.deltaBytes += state.uint8Buffer.length - oldBufferLength;
|
261
|
}
|
262
|
/**
|
263
|
* Resize section byte size.
|
264
|
* If the length of the LEB-encoded size changes, this can change
|
265
|
* the offset for nodes in the section. So we do this before
|
266
|
* shifting following operations' nodes.
|
267
|
*/
|
268
|
|
269
|
|
270
|
if (state.deltaBytes !== 0 && sectionName !== "start") {
|
271
|
var _oldBufferLength = state.uint8Buffer.length;
|
272
|
state.uint8Buffer = resizeSectionByteSize(ast, state.uint8Buffer, sectionName, state.deltaBytes); // Infer bytes added/removed by comparing buffer lengths
|
273
|
|
274
|
state.deltaBytes += state.uint8Buffer.length - _oldBufferLength;
|
275
|
}
|
276
|
/**
|
277
|
* Shift following operation's nodes
|
278
|
*/
|
279
|
|
280
|
|
281
|
if (state.deltaBytes !== 0) {
|
282
|
ops.forEach(function (op) {
|
283
|
// We don't need to handle add ops, they are positioning independent
|
284
|
switch (op.kind) {
|
285
|
case "update":
|
286
|
shiftLocNodeByDelta(op.oldNode, state.deltaBytes);
|
287
|
break;
|
288
|
|
289
|
case "delete":
|
290
|
shiftLocNodeByDelta(op.node, state.deltaBytes);
|
291
|
break;
|
292
|
}
|
293
|
});
|
294
|
}
|
295
|
|
296
|
uint8Buffer = state.uint8Buffer;
|
297
|
});
|
298
|
return uint8Buffer;
|
299
|
}
|