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diff --git a/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Indexer/Functions.php b/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Indexer/Functions.php
new file mode 100644
index 000000000..ad575854b
--- /dev/null
+++ b/web/modules/contrib/drupalmoduleupgrader/src/Plugin/DMU/Indexer/Functions.php
@@ -0,0 +1,212 @@
+<?php
+
+namespace Drupal\drupalmoduleupgrader\Plugin\DMU\Indexer;
+
+use Drupal\Component\Utility\SafeMarkup;
+use Drupal\drupalmoduleupgrader\IndexerBase;
+use Drupal\drupalmoduleupgrader\IndexerExecutionInterface;
+use Drupal\drupalmoduleupgrader\IndexerUsageInterface;
+use Drupal\drupalmoduleupgrader\Utility\Filter\ContainsLogicFilter;
+use Pharborist\Filter;
+use Pharborist\Functions\FunctionDeclarationNode;
+use Pharborist\NodeCollection;
+use Pharborist\NodeInterface;
+use Pharborist\Parser;
+
+/**
+ * @Indexer(
+ *  id = "function"
+ * )
+ */
+class Functions extends IndexerBase implements IndexerExecutionInterface, IndexerUsageInterface {
+
+  protected function prepareID($id) {
+    return preg_replace('/^hook_/', $this->target->id() . '_', $id);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function has($identifier) {
+    return parent::has($this->prepareID($identifier));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function hasAny(array $identifiers) {
+    return parent::hasAny(array_map([ $this, 'prepareID' ], $identifiers));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function hasAll(array $identifiers) {
+    return parent::hasAll(array_map([ $this, 'prepareID' ], $identifiers));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function addFile($path) {
+    $doc = Parser::parseFile($path);
+
+    $doc
+      ->children(Filter::isInstanceOf('\Pharborist\Functions\FunctionDeclarationNode'))
+      ->each([ $this, 'add' ]);
+
+    $doc
+      ->find(Filter::isInstanceOf('\Pharborist\Functions\FunctionCallNode'))
+      ->each([ $this, 'add' ]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function add(NodeInterface $node) {
+    /** @var \Pharborist\Functions\FunctionDeclarationNode|\Pharborist\Functions\FunctionCallNode $node */
+    $fields = [
+      'id' => (string) $node->getName(),
+      'file' => $node->getFilename(),
+      'type' => get_class($node),
+    ];
+
+    if ($node instanceof FunctionDeclarationNode) {
+      $logical = new ContainsLogicFilter();
+      $logical->whitelist('t');
+      $logical->whitelist('drupal_get_path');
+      $fields['has_logic'] = (int) $node->is($logical);
+    }
+
+    $this->db
+      ->insert($this->table)
+      ->fields($fields)
+      ->execute();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function delete($id) {
+    parent::delete($this->prepareID($id));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function get($identifier) {
+    $identifier = $this->prepareID($identifier);
+
+    $file = $this->getQuery(['file'])
+      ->condition('id', $identifier)
+      ->execute()
+      ->fetchField();
+
+    return $this->target
+      ->open($file)
+      ->children(Filter::isFunction($identifier))
+      ->get(0);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getMultiple(array $identifiers) {
+    return parent::getMultiple(array_map([ $this, 'prepareID' ], $identifiers));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFields() {
+    $fields = parent::getFields();
+
+    $fields['type'] = array(
+      'type' => 'varchar',
+      'length' => 255,
+      'not null' => TRUE,
+    );
+    $fields['has_logic'] = array(
+      'type' => 'int',
+      'size' => 'tiny',
+      'unsigned' => TRUE,
+    );
+
+    return $fields;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuery(array $fields = []) {
+    return parent::getQuery($fields)->condition('type', 'Pharborist\Functions\FunctionDeclarationNode');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function hasExecutable($identifier) {
+    if ($this->has($identifier)) {
+      $ret = $this->getQuery()
+        ->condition('id', $this->prepareID($identifier))
+        ->condition('has_logic', 0)
+        ->countQuery()
+        ->execute()
+        ->fetchField();
+      return $ret;
+    }
+    else {
+      return FALSE;
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function execute($identifier, array $arguments = []) {
+    $function = $this->prepareID($identifier);
+
+    // If the function already exists, we can safely assume that it's already
+    // been scanned for dangerous logic and evaluated into existence.
+    if (function_exists($function)) {
+      return call_user_func_array($function, $arguments);
+    }
+    else {
+      if ($this->hasExecutable($function)) {
+        eval($this->get($function)->get(0)->getText());
+        return $this->execute($function, $arguments);
+      }
+      else {
+        $variables = [
+          '@function' => $function,
+        ];
+        throw new \LogicException(SafeMarkup::format('Cowardly refusing to execute @function.', $variables));
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getUsages($identifier) {
+    $function = $this->prepareID($identifier);
+
+    $files = $this->getQuery(['file'])
+      ->distinct()
+      ->condition('id', $function)
+      ->condition('type', 'Pharborist\Functions\FunctionCallNode')
+      ->execute()
+      ->fetchCol();
+
+    $usages = new NodeCollection();
+    foreach ($files as $file) {
+      $this->target
+        ->open($file)
+        ->find(Filter::isFunctionCall($function))
+        ->addTo($usages);
+    }
+
+    return $usages;
+  }
+
+}