ikan Uploader :
Directory : /home/ubuntu/node-v16.18.1/deps/v8/tools/clusterfuzz/js_fuzzer/mutators/
Upload File : |
| Current File : //home/ubuntu/node-v16.18.1/deps/v8/tools/clusterfuzz/js_fuzzer/mutators/expression_mutator.js |
// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Expression mutator.
*/
'use strict';
const babelTypes = require('@babel/types');
const random = require('../random.js');
const mutator = require('./mutator.js');
class ExpressionMutator extends mutator.Mutator {
constructor(settings) {
super();
this.settings = settings;
}
get visitor() {
const thisMutator = this;
return {
ExpressionStatement(path) {
if (!random.choose(thisMutator.settings.MUTATE_EXPRESSIONS)) {
return;
}
const probability = random.random();
if (probability < 0.7) {
const repeated = babelTypes.cloneDeep(path.node);
thisMutator.annotate(repeated, 'Repeated');
thisMutator.insertBeforeSkip(path, repeated);
} else if (path.key > 0) {
// Get a random previous sibling.
const prev = path.getSibling(random.randInt(0, path.key - 1));
if (!prev || !prev.node) {
return;
}
// Either select a previous or the current node to clone.
const [selected, destination] = random.shuffle([prev, path]);
if (selected.isDeclaration()) {
return;
}
const cloned = babelTypes.cloneDeep(selected.node);
thisMutator.annotate(cloned, 'Cloned sibling');
if (random.choose(0.5)) {
thisMutator.insertBeforeSkip(destination, cloned);
} else {
thisMutator.insertAfterSkip(destination, cloned);
}
}
},
};
}
}
module.exports = {
ExpressionMutator: ExpressionMutator,
};
Kontol Shell Bypass