Add ChiselEnum.safe factory method and avoid warning

Previously, ChiselEnum would warn any time a UInt is converted to an
Enum. There was no way to suppress this warning. Now there is a factory
method (`.safe`) that does not warn and returns (Enum, Bool) where the
Bool is the result of calling .isValid on an Enum object. The regular
UInt cast is also now smarter and will not warn if all bitvectors of the
width of the Enum are legal states.

1 files changed, 16 insertions, 1 deletions

diff --git a/src/test/scala/chiselTests/ChiselSpec.scala b/src/test/scala/chiselTests/ChiselSpec.scala
index a4192c5e..e513189e 100644
--- a/src/test/scala/chiselTests/ChiselSpec.scala
+++ b/src/test/scala/chiselTests/ChiselSpec.scala
@@ -9,6 +9,7 @@ import chisel3.testers._
 import firrtl.annotations.Annotation
 import firrtl.util.BackendCompilationUtilities
 import firrtl.{AnnotationSeq, EmittedVerilogCircuitAnnotation}
+import _root_.logger.Logger
 import org.scalacheck._
 import org.scalatest._
 import org.scalatest.flatspec.AnyFlatSpec
@@ -17,7 +18,7 @@ import org.scalatest.propspec.AnyPropSpec
 import org.scalatest.matchers.should.Matchers
 import org.scalatestplus.scalacheck.ScalaCheckPropertyChecks
 
-import java.io.ByteArrayOutputStream
+import java.io.{ByteArrayOutputStream, PrintStream}
 import java.security.Permission
 import scala.reflect.ClassTag
 
@@ -172,6 +173,20 @@ trait Utils {
     (stdout.toString, stderr.toString, ret)
   }
 
+  /** Run some Scala thunk and return all logged messages as Strings
+    * @param thunk some Scala code
+    * @return a tuple containing LOGGED, and what the thunk returns
+    */
+  def grabLog[T](thunk: => T): (String, T) = {
+    val baos = new ByteArrayOutputStream()
+    val stream = new PrintStream(baos, true, "utf-8")
+    val ret = Logger.makeScope(Nil) {
+      Logger.setOutput(stream)
+      thunk
+    }
+    (baos.toString, ret)
+  }
+
   /** Encodes a System.exit exit code
     * @param status the exit code
     */