Update Module.scala

1 files changed, 23 insertions, 0 deletions

diff --git a/core/src/main/scala/chisel3/util/Naming.scala b/core/src/main/scala/chisel3/util/Naming.scala
new file mode 100644
index 00000000..a78744b2
--- /dev/null
+++ b/core/src/main/scala/chisel3/util/Naming.scala
@@ -0,0 +1,23 @@
+package chisel3.util
+
+/* Generates a safe 'simple class name' from the given class, avoiding `Malformed class name` exceptions from `getClass.getSimpleName`
+ * when Java 8 is used.
+ */
+object simpleClassName {
+
+  def apply[T](clazz: Class[T]): String = {
+    /* The default class name is derived from the Java reflection derived class name. */
+    val baseName = clazz.getName
+
+    /* A sequence of string filters applied to the name */
+    val filters: Seq[String => String] =
+      Seq(((a: String) => raw"\$$+anon".r.replaceAllIn(a, "_Anon")) // Merge the "$$anon" name with previous name
+      )
+
+    filters
+      .foldLeft(baseName) { case (str, filter) => filter(str) } // 1. Apply filters to baseName
+      .split("\\.|\\$") // 2. Split string at '.' or '$'
+      .filterNot(_.forall(_.isDigit)) // 3. Drop purely numeric names
+      .last // 4. Use the last name
+  }
+}