Method mutate

deps/v8/tools/clusterfuzz/js_fuzzer/script_mutator.js:205–242

(source, context)

  }

  mutate(source, context) {
    let mutators = this.mutators.slice();
    let annotations = [];
    if (random.choose(this.settings.SCRIPT_MUTATOR_SHUFFLE)){
      annotations.push(' Script mutator: using shuffled mutators');
      random.shuffle(mutators);
    }

    if (random.choose(this.settings.SCRIPT_MUTATOR_EXTRA_MUTATIONS)){
      for (let i = random.randInt(1, MAX_EXTRA_MUTATIONS); i > 0; i--) {
        let mutator = random.single(this.mutators);
        mutators.push(mutator);
        annotations.push(` Script mutator: extra ${mutator.constructor.name}`);
      }
    }

    // We always remove certain closures first.
    mutators.unshift(this.closures);

    // Try-catch wrapping should follow after error-prone mutations.
    mutators.push(this.trycatch);

    // Non-error-prone mutations that should not get further arbitrarily mutated.
    // It is ok to unicode escape, as we do next.
    mutators.push(this.timeout);

    // This shouldn't get further mutated, because Babel functionality gets broken
    // when identifier names are changed.
    mutators.push(this.unicode);

    for (const mutator of mutators) {
      mutator.mutate(source, context);
    }

    for (const annotation of annotations.reverse()) {
      sourceHelpers.annotateWithComment(source.ast, annotation);
    }
  }

  /**
   * Particular dependencies have precedence over others due to duplicate