Disabled CyclomaticComplexity check. This code is sometimes called multiple 10's of millions of times so micro-optimizations are the name of the game here.

kschroeder · kschroeder · commit ea907205c027 · 2017-03-24T16:52:48.000-05:00
diff --git a/setup/src/Magento/Setup/Module/Di/Code/Reader/FileClassScanner.php b/setup/src/Magento/Setup/Module/Di/Code/Reader/FileClassScanner.php
@@ -66,6 +66,7 @@ public function getFileContents()
      * Extracts the fully qualified class name from a file.  It only searches for the first match and stops looking
      * as soon as it enters the class definition itself.
      *
+     * @SuppressWarnings(PHPMD.CyclomaticComplexity)
      * @return array
      */
 

Original file line number	Diff line number	Diff line change
`@@ -66,6 +66,7 @@ public function getFileContents()`
`66`	`66`	`* Extracts the fully qualified class name from a file. It only searches for the first match and stops looking`
`67`	`67`	`* as soon as it enters the class definition itself.`
`68`	`68`	`*`
	`69`	`+ * @SuppressWarnings(PHPMD.CyclomaticComplexity)`
`69`	`70`	`* @return array`
`70`	`71`	`*/`
`71`	`72`