Repackagecore rebase (#1078)

* Move Bits, Data, and BitPat to chiselFrontend/src/main/scala/chisel3
 and deal with the subsequent fallout.

* Move Aggregate, Clock, Mem, Printf, Reg

* Move almost all chisel3.core definitions to chisel3 or chisel3.experimental

* Revive core package object to provide aliases for moved definitions.

* Cleanup package definitions; eliminate ambiguous implicits

* Move more definitions to experimental.
Extract BaseModule, DataMirror, ExtModule, IO into their own files.

* Put BitPat back in chisel3.util

* More experimental motion - avoid multiple import definitions.

* Add experimental.FixedPoint alias

* Add EnumType definition to core package.
Update deprecated messages to refer to correct object

* Move FixedPoint into the experimental package (but keep it in Bits.scala).

* Add missing implicits to core/package - compatibility

* Cleanup: update ScalaDoc references; remove unused imports

* Add Reset alias to core/package

* Use common 3.2 version in deprecation warning

* Move Binding from core to internal.

* Optimize imports.

* Repair IntelliJ's overly cleanliness.

* Move Bits, Data, and BitPat to chiselFrontend/src/main/scala/chisel3
 and deal with the subsequent fallout.

Move Aggregate, Clock, Mem, Printf, Reg

Move almost all chisel3.core definitions to chisel3 or chisel3.experimental

Revive core package object to provide aliases for moved definitions.

Cleanup package definitions; eliminate ambiguous implicits

Move more definitions to experimental.
Extract BaseModule, DataMirror, ExtModule, IO into their own files.

Add EnumType definition to core package.
Update deprecated messages to refer to correct object

Move FixedPoint into the experimental package (but keep it in Bits.scala).

Add missing implicits to core/package - compatibility

Cleanup: update ScalaDoc references; remove unused imports

Use common 3.2 version in deprecation warning

Move Binding from core to internal.

* Change == to reference equality (eq) in Data print (#1044)

* Remove @chiselName from MixedVec (#1045)

* Fix enum annotations (#936)

* Turned off strong enum annotations because they weren't working with Vec
indexes
* Add new EnumVecAnnotation for vecs of enums and vecs of bundles with
enum fields
* Changed Clock's width parameter back to a fixed constant value of 1
* Fixed enum annotations for Vecs of Bundles which contain enum elements
* Fixed usage of "when/otherwise" to use consistent style

* Add Record to type hierarchy documentation

* Undeprecate isLit (#1048)

* move doNotDedup to experimental (#1008)

* Aggregate coverage - aggregate tests but not publishing (#1040)

Discover a working combination of aggregate usage to enable coverage of subproject testing but publish a single Jar.
Use "scalastyle-test-config.xml" for scalastyle config in tests.
Enable "_" in method names and accept method names ending in "_=".
Re-sync scalastyle-test-config.xml with scalastyle-config.xml
This should finally fix #772.

* Check field referential equality in autoclonetype (#1047)

* Allow naming annotation to work outside builder context (#1051)

* Try to eliminate JVM hang due to static initialization deadlock (#1053)

* Make core.DontCare private to chisel3 (#1054)

Force clients to access 'DontCare' through the chisel3 package to ensure it's created as a chisel3 object and not a client object.

* Ignore empty aggregates elements when binding aggregate direction (#946)

Previously, including an empty aggregate in a Bundle would cause
a MixedDirectionAggregateException because it has no elements and thus
doesn't have a direction

* Add SampleElementBinding for Vec sample elements
* Add ActualDirection.Empty for bound empty aggregates

* Detect bundle aliasing (#1050)

* Implement connectFromBits in ChiselEnum (#1052)

This is necessary to use ChiselEnum in aggregates where things are
casted using .asTypeOf

* Optimize imports.

* Move Analog to experimental.

* More repackage cleanup - reduce differences with master.

* Cleanup chisel3 references.

* More chisel3 reference cleanup.

* Merge cleanup.

* Remove unused import

* Bump core deprecation to 3.3

* Move DontCare back into Data.scala inside package internal

* Re-indent experimental/internal package code

* Move code back to original files - facilitate comparison with other branches

* Some code motion, update imports, minimize master differences
Move exceptions up to chisel3 package object - they're part of the interface.

* More master diff minimization.

* Try to eliminate JVM hang due to static initialization deadlock (#1053)

* Ignore empty aggregates elements when binding aggregate direction (#946)

Previously, including an empty aggregate in a Bundle would cause
a MixedDirectionAggregateException because it has no elements and thus
doesn't have a direction

* Add SampleElementBinding for Vec sample elements
* Add ActualDirection.Empty for bound empty aggregates

* Implement connectFromBits in ChiselEnum (#1052)

This is necessary to use ChiselEnum in aggregates where things are
casted using .asTypeOf

* Move Analog to experimental.

More repackage cleanup - reduce differences with master.

Cleanup chisel3 references.

More chisel3 reference cleanup.

* Fix wrong directionality for Vec(Flipped())

Create Chisel IR Port() in a way that Converter is happy with.
Also add more extensive test suite for future-proofing.

Close #1063

* Move Bits, Data, and BitPat to chiselFrontend/src/main/scala/chisel3
 and deal with the subsequent fallout.

Move Aggregate, Clock, Mem, Printf, Reg

Move almost all chisel3.core definitions to chisel3 or chisel3.experimental

Revive core package object to provide aliases for moved definitions.

Cleanup package definitions; eliminate ambiguous implicits

Move more definitions to experimental.
Extract BaseModule, DataMirror, ExtModule, IO into their own files.

Put BitPat back in chisel3.util

More experimental motion - avoid multiple import definitions.

Add experimental.FixedPoint alias

Add EnumType definition to core package.
Update deprecated messages to refer to correct object

Move FixedPoint into the experimental package (but keep it in Bits.scala).

Add missing implicits to core/package - compatibility

Cleanup: update ScalaDoc references; remove unused imports

Add Reset alias to core/package

Use common 3.2 version in deprecation warning

Move Binding from core to internal.

Optimize imports.

Repair IntelliJ's overly cleanliness.

Move Bits, Data, and BitPat to chiselFrontend/src/main/scala/chisel3
 and deal with the subsequent fallout.

Move Aggregate, Clock, Mem, Printf, Reg

Move almost all chisel3.core definitions to chisel3 or chisel3.experimental

Revive core package object to provide aliases for moved definitions.

Cleanup package definitions; eliminate ambiguous implicits

Move more definitions to experimental.
Extract BaseModule, DataMirror, ExtModule, IO into their own files.

Add EnumType definition to core package.
Update deprecated messages to refer to correct object

Move FixedPoint into the experimental package (but keep it in Bits.scala).

Add missing implicits to core/package - compatibility

Cleanup: update ScalaDoc references; remove unused imports

Use common 3.2 version in deprecation warning

Move Binding from core to internal.

Optimize imports.

Merge cleanup.

Remove unused import

Bump core deprecation to 3.3

Move DontCare back into Data.scala inside package internal

Re-indent experimental/internal package code

Move code back to original files - facilitate comparison with other branches

Some code motion, update imports, minimize master differences
Move exceptions up to chisel3 package object - they're part of the interface.

More master diff minimization.

Fix minor discrepancies with repackagecore-testbed

* Remove redundant imports
As part of its import updating process, IntelliJ converted some import statements to `import package.{object, _}`. Is this intended to show an explicit dependency on `package.object` and a further dependency on `package` implicits? Unsure. Replace these with `import package._`

* Move the BaseModule object into the internal package.

1 files changed, 359 insertions, 0 deletions

diff --git a/chiselFrontend/src/main/scala/chisel3/package.scala b/chiselFrontend/src/main/scala/chisel3/package.scala
new file mode 100644
index 00000000..d6c590b4
--- /dev/null
+++ b/chiselFrontend/src/main/scala/chisel3/package.scala
@@ -0,0 +1,359 @@
+// See LICENSE for license details.
+
+package object chisel3 {    // scalastyle:ignore package.object.name
+  import internal.firrtl.{Port, Width}
+  import internal.sourceinfo.{SourceInfo, VecTransform}
+  import internal.{Builder, chiselRuntimeDeprecated}
+
+  import scala.language.implicitConversions
+
+      /**
+        * These implicit classes allow one to convert scala.Int|scala.BigInt to
+        * Chisel.UInt|Chisel.SInt by calling .asUInt|.asSInt on them, respectively.
+        * The versions .asUInt(width)|.asSInt(width) are also available to explicitly
+        * mark a width for the new literal.
+        *
+        * Also provides .asBool to scala.Boolean and .asUInt to String
+        *
+        * Note that, for stylistic reasons, one should avoid extracting immediately
+        * after this call using apply, ie. 0.asUInt(1)(0) due to potential for
+        * confusion (the 1 is a bit length and the 0 is a bit extraction position).
+        * Prefer storing the result and then extracting from it.
+        *
+        * Implementation note: the empty parameter list (like `U()`) is necessary to prevent
+        * interpreting calls that have a non-Width parameter as a chained apply, otherwise things like
+        * `0.asUInt(16)` (instead of `16.W`) compile without error and produce undesired results.
+        */
+      implicit class fromBigIntToLiteral(bigint: BigInt) {
+        /** Int to Bool conversion, allowing compact syntax like 1.B and 0.B
+          */
+        def B: Bool = bigint match { // scalastyle:ignore method.name
+          case bigint if bigint == 0 => Bool.Lit(false)
+          case bigint if bigint == 1 => Bool.Lit(true)
+          case bigint => Builder.error(s"Cannot convert $bigint to Bool, must be 0 or 1"); Bool.Lit(false)
+        }
+        /** Int to UInt conversion, recommended style for constants.
+          */
+        def U: UInt = UInt.Lit(bigint, Width())  // scalastyle:ignore method.name
+        /** Int to SInt conversion, recommended style for constants.
+          */
+        def S: SInt = SInt.Lit(bigint, Width())  // scalastyle:ignore method.name
+        /** Int to UInt conversion with specified width, recommended style for constants.
+          */
+        def U(width: Width): UInt = UInt.Lit(bigint, width)  // scalastyle:ignore method.name
+        /** Int to SInt conversion with specified width, recommended style for constants.
+          */
+        def S(width: Width): SInt = SInt.Lit(bigint, width)  // scalastyle:ignore method.name
+
+        /** Int to UInt conversion, recommended style for variables.
+          */
+        def asUInt(): UInt = UInt.Lit(bigint, Width())
+        /** Int to SInt conversion, recommended style for variables.
+          */
+        def asSInt(): SInt = SInt.Lit(bigint, Width())
+        /** Int to UInt conversion with specified width, recommended style for variables.
+          */
+        def asUInt(width: Width): UInt = UInt.Lit(bigint, width)
+        /** Int to SInt conversion with specified width, recommended style for variables.
+          */
+        def asSInt(width: Width): SInt = SInt.Lit(bigint, width)
+      }
+
+      implicit class fromIntToLiteral(int: Int) extends fromBigIntToLiteral(int)
+      implicit class fromLongToLiteral(long: Long) extends fromBigIntToLiteral(long)
+
+      implicit class fromStringToLiteral(str: String) {
+        /** String to UInt parse, recommended style for constants.
+          */
+        def U: UInt = str.asUInt() // scalastyle:ignore method.name
+        /** String to UInt parse with specified width, recommended style for constants.
+          */
+        def U(width: Width): UInt = str.asUInt(width) // scalastyle:ignore method.name
+
+        /** String to UInt parse, recommended style for variables.
+          */
+        def asUInt(): UInt = {
+          val bigInt = parse(str)
+          UInt.Lit(bigInt, Width(bigInt.bitLength max 1))
+        }
+        /** String to UInt parse with specified width, recommended style for variables.
+          */
+        def asUInt(width: Width): UInt = UInt.Lit(parse(str), width)
+
+        protected def parse(n: String) = {
+          val (base, num) = n.splitAt(1)
+          val radix = base match {
+            case "x" | "h" => 16
+            case "d" => 10
+            case "o" => 8
+            case "b" => 2
+            case _ => Builder.error(s"Invalid base $base"); 2
+          }
+          BigInt(num.filterNot(_ == '_'), radix)
+        }
+      }
+
+      implicit class fromBooleanToLiteral(boolean: Boolean) {
+        /** Boolean to Bool conversion, recommended style for constants.
+          */
+        def B: Bool = Bool.Lit(boolean)  // scalastyle:ignore method.name
+
+        /** Boolean to Bool conversion, recommended style for variables.
+          */
+        def asBool(): Bool = Bool.Lit(boolean)
+      }
+
+      // Fixed Point is experimental for now, but we alias the implicit conversion classes here
+      //  to minimize disruption with existing code.
+      implicit class fromDoubleToLiteral(double: Double) extends experimental.FixedPoint.Implicits.fromDoubleToLiteral(double)
+      implicit class fromIntToBinaryPoint(int: Int) extends experimental.FixedPoint.Implicits.fromIntToBinaryPoint(int)
+
+      implicit class fromIntToWidth(int: Int) {
+        def W: Width = Width(int)  // scalastyle:ignore method.name
+      }
+
+  val WireInit = WireDefault
+
+  implicit class AddDirectionToData[T<:Data](target: T) {
+    @chiselRuntimeDeprecated
+    @deprecated("Input(Data) should be used over Data.asInput", "chisel3")
+    def asInput(implicit compileOptions: CompileOptions): T = Input(target)
+
+    @chiselRuntimeDeprecated
+    @deprecated("Output(Data) should be used over Data.asOutput", "chisel3")
+    def asOutput(implicit compileOptions: CompileOptions): T = Output(target)
+
+    @chiselRuntimeDeprecated
+    @deprecated("Flipped(Data) should be used over Data.flip", "chisel3")
+    def flip()(implicit compileOptions: CompileOptions): T = Flipped(target)
+  }
+
+  implicit class fromBitsable[T <: Data](data: T) {
+
+    @chiselRuntimeDeprecated
+    @deprecated("fromBits is deprecated, use asTypeOf instead", "chisel3")
+    def fromBits(that: Bits)(implicit sourceInfo: SourceInfo, compileOptions: CompileOptions): T = {
+      that.asTypeOf(data)
+    }
+  }
+
+  implicit class cloneTypeable[T <: Data](target: T) {
+    @chiselRuntimeDeprecated
+    @deprecated("chiselCloneType is deprecated, use chiselTypeOf(...) to get the Chisel Type of a hardware object", "chisel3") // scalastyle:ignore line.size.limit
+    def chiselCloneType: T = {
+      target.cloneTypeFull.asInstanceOf[T]
+    }
+  }
+
+  object Vec extends VecFactory {
+    import scala.language.experimental.macros
+
+    @chiselRuntimeDeprecated
+    @deprecated("Vec argument order should be size, t; this will be removed by the official release", "chisel3")
+    def apply[T <: Data](gen: T, n: Int)(implicit sourceInfo: SourceInfo, compileOptions: CompileOptions): chisel3.Vec[T] =
+      apply(n, gen)
+
+    @chiselRuntimeDeprecated
+    @deprecated("Vec.fill(n)(gen) is deprecated, use VecInit(Seq.fill(n)(gen)) instead", "chisel3")
+    def fill[T <: Data](n: Int)(gen: => T)(implicit sourceInfo: SourceInfo, compileOptions: CompileOptions): chisel3.Vec[T] =
+      apply(Seq.fill(n)(gen))
+
+    def apply[T <: Data](elts: Seq[T]): chisel3.Vec[T] = macro VecTransform.apply_elts
+    @chiselRuntimeDeprecated
+    @deprecated("Vec(elts) is deprecated, use VecInit(elts) instead", "chisel3")
+    def do_apply[T <: Data](elts: Seq[T])(implicit sourceInfo: SourceInfo, compileOptions: CompileOptions): chisel3.Vec[T] =
+      chisel3.VecInit(elts)
+
+    def apply[T <: Data](elt0: T, elts: T*): chisel3.Vec[T] = macro VecTransform.apply_elt0
+    @chiselRuntimeDeprecated
+    @deprecated("Vec(elt0, ...) is deprecated, use VecInit(elt0, ...) instead", "chisel3")
+    def do_apply[T <: Data](elt0: T, elts: T*)
+        (implicit sourceInfo: SourceInfo, compileOptions: CompileOptions): chisel3.Vec[T] =
+      VecInit(elt0 +: elts.toSeq)
+
+    def tabulate[T <: Data](n: Int)(gen: (Int) => T): chisel3.Vec[T] = macro VecTransform.tabulate
+    @chiselRuntimeDeprecated
+    @deprecated("Vec.tabulate(n)(gen) is deprecated, use VecInit.tabulate(n)(gen) instead", "chisel3")
+    def do_tabulate[T <: Data](n: Int)(gen: (Int) => T)
+        (implicit sourceInfo: SourceInfo, compileOptions: CompileOptions): chisel3.Vec[T] =
+      chisel3.VecInit.tabulate(n)(gen)
+  }
+
+  // Some possible regex replacements for the literal specifier deprecation:
+  // (note: these are not guaranteed to handle all edge cases! check all replacements!)
+  // Bool\((true|false)\)
+  //  => $1.B
+  // UInt\(width\s*=\s*(\d+|[_a-zA-Z][_0-9a-zA-Z]*)\)
+  //  => UInt($1.W)
+  // (UInt|SInt|Bits).width\((\d+|[_a-zA-Z][_0-9a-zA-Z]*)\)
+  //  => $1($2.W)
+  // (U|S)Int\((-?\d+|0[xX][0-9a-fA-F]+)\)
+  //  => $2.$1
+  // UInt\((\d+|0[xX][0-9a-fA-F]+),\s*(?:width\s*=)?\s*(\d+|[_a-zA-Z][_0-9a-zA-Z]*)\)
+  //  => $1.U($2.W)
+  // (UInt|SInt|Bool)\(([_a-zA-Z][_0-9a-zA-Z]*)\)
+  //  => $2.as$1
+  // (UInt|SInt)\(([_a-zA-Z][_0-9a-zA-Z]*),\s*(?:width\s*=)?\s*(\d+|[_a-zA-Z][_0-9a-zA-Z]*)\)
+  //  => $2.as$1($3.W)
+
+  /** This contains literal constructor factory methods that are deprecated as of Chisel3.
+    * These will be removed very soon. It's recommended you port your code ASAP.
+    */
+  trait UIntFactory extends UIntFactoryBase {
+    /** Create a UInt literal with inferred width. */
+    @chiselRuntimeDeprecated
+    @deprecated("use n.U", "chisel3, will be removed by end of 2017")
+    def apply(n: String): UInt = n.asUInt
+
+    /** Create a UInt literal with fixed width. */
+    @chiselRuntimeDeprecated
+    @deprecated("use n.U(width.W)", "chisel3, will be removed by end of 2017")
+    def apply(n: String, width: Int): UInt = n.asUInt(width.W)
+
+    /** Create a UInt literal with specified width. */
+    @chiselRuntimeDeprecated
+    @deprecated("use value.U(width)", "chisel3, will be removed by end of 2017")
+    def apply(value: BigInt, width: Width): UInt = value.asUInt(width)
+
+    /** Create a UInt literal with fixed width. */
+    @chiselRuntimeDeprecated
+    @deprecated("use value.U(width.W)", "chisel3, will be removed by end of 2017")
+    def apply(value: BigInt, width: Int): UInt = value.asUInt(width.W)
+
+    /** Create a UInt literal with inferred width.- compatibility with Chisel2. */
+    @chiselRuntimeDeprecated
+    @deprecated("use value.U", "chisel3, will be removed by end of 2017")
+    def apply(value: BigInt): UInt = value.asUInt
+
+    /** Create a UInt with a specified width */
+    @chiselRuntimeDeprecated
+    @deprecated("use UInt(width.W)", "chisel3, will be removed by end of 2017")
+    def width(width: Int): UInt = apply(width.W)
+
+    /** Create a UInt port with specified width. */
+    @chiselRuntimeDeprecated
+    @deprecated("use UInt(width)", "chisel3, will be removed by end of 2017")
+    def width(width: Width): UInt = apply(width)
+  }
+
+  /** This contains literal constructor factory methods that are deprecated as of Chisel3.
+    * These will be removed very soon. It's recommended you move your code soon.
+    */
+  trait SIntFactory extends SIntFactoryBase {
+    /** Create a SInt type or port with fixed width. */
+    @chiselRuntimeDeprecated
+    @deprecated("use SInt(width.W)", "chisel3, will be removed by end of 2017")
+    def width(width: Int): SInt = apply(width.W)
+
+    /** Create an SInt type with specified width. */
+    @chiselRuntimeDeprecated
+    @deprecated("use SInt(width)", "chisel3, will be removed by end of 2017")
+    def width(width: Width): SInt = apply(width)
+
+    /** Create an SInt literal with inferred width. */
+    @chiselRuntimeDeprecated
+    @deprecated("use value.S", "chisel3, will be removed by end of 2017")
+    def apply(value: BigInt): SInt = value.asSInt
+
+    /** Create an SInt literal with fixed width. */
+    @chiselRuntimeDeprecated
+    @deprecated("use value.S(width.W)", "chisel3, will be removed by end of 2017")
+    def apply(value: BigInt, width: Int): SInt = value.asSInt(width.W)
+
+    /** Create an SInt literal with specified width. */
+    @chiselRuntimeDeprecated
+    @deprecated("use value.S(width)", "chisel3, will be removed by end of 2017")
+    def apply(value: BigInt, width: Width): SInt = value.asSInt(width)
+
+    @chiselRuntimeDeprecated
+    @deprecated("use value.S", "chisel3, will be removed by end of 2017")
+    def Lit(value: BigInt): SInt = value.asSInt // scalastyle:ignore method.name
+
+    @chiselRuntimeDeprecated
+    @deprecated("use value.S(width)", "chisel3, will be removed by end of 2017")
+    def Lit(value: BigInt, width: Int): SInt = value.asSInt(width.W) // scalastyle:ignore method.name
+  }
+
+  /** This contains literal constructor factory methods that are deprecated as of Chisel3.
+    * These will be removed very soon. It's recommended you move your code soon.
+    */
+  trait BoolFactory extends BoolFactoryBase {
+    /** Creates Bool literal.
+     */
+    @chiselRuntimeDeprecated
+    @deprecated("use x.B", "chisel3, will be removed by end of 2017")
+    def apply(x: Boolean): Bool = x.B
+  }
+
+  object Bits extends UIntFactory
+  object UInt extends UIntFactory
+  object SInt extends SIntFactory
+  object Bool extends BoolFactory
+
+  type InstanceId = internal.InstanceId
+
+  @deprecated("Use 'SyncReadMem'", "chisel3")
+  val SeqMem = chisel3.SyncReadMem
+  @deprecated("Use 'SyncReadMem'", "chisel3")
+  type SeqMem[T <: Data] = SyncReadMem[T]
+
+  type Module = chisel3.experimental.LegacyModule
+
+  /** Implicit for custom Printable string interpolator */
+  implicit class PrintableHelper(val sc: StringContext) extends AnyVal {
+    /** Custom string interpolator for generating Printables: p"..."
+      * Will call .toString on any non-Printable arguments (mimicking s"...")
+      */
+    def p(args: Any*): Printable = {
+      sc.checkLengths(args) // Enforce sc.parts.size == pargs.size + 1
+      val pargs: Seq[Option[Printable]] = args map {
+        case p: Printable => Some(p)
+        case d: Data => Some(d.toPrintable)
+        case any => for {
+          v <- Option(any) // Handle null inputs
+          str = v.toString
+          if !str.isEmpty // Handle empty Strings
+        } yield PString(str)
+      }
+      val parts = sc.parts map StringContext.treatEscapes
+      // Zip sc.parts and pargs together ito flat Seq
+      // eg. Seq(sc.parts(0), pargs(0), sc.parts(1), pargs(1), ...)
+      val seq = for { // append None because sc.parts.size == pargs.size + 1
+        (literal, arg) <- parts zip (pargs :+ None)
+        optPable <- Seq(Some(PString(literal)), arg)
+        pable <- optPable // Remove Option[_]
+      } yield pable
+      Printables(seq)
+    }
+  }
+
+  implicit def string2Printable(str: String): Printable = PString(str)
+
+  type ChiselException = internal.ChiselException
+
+  // Debugger/Tester access to internal Chisel data structures and methods.
+  def getDataElements(a: Aggregate): Seq[Element] = {
+    a.allElements
+  }
+  def getModulePorts(m: Module): Seq[Port] = m.getPorts
+  // Invalidate API - a DontCare element for explicit assignment to outputs,
+  //  indicating the signal is intentionally not driven.
+  val DontCare = chisel3.internal.InternalDontCare
+
+  class BindingException(message: String) extends ChiselException(message)
+  /** A function expected a Chisel type but got a hardware object
+    */
+  case class ExpectedChiselTypeException(message: String) extends BindingException(message)
+  /**A function expected a hardware object but got a Chisel type
+    */
+  case class ExpectedHardwareException(message: String) extends BindingException(message)
+  /** An aggregate had a mix of specified and unspecified directionality children
+    */
+  case class MixedDirectionAggregateException(message: String) extends BindingException(message)
+  /** Attempted to re-bind an already bound (directionality or hardware) object
+    */
+  case class RebindingException(message: String) extends BindingException(message)
+  // Connection exceptions.
+  case class BiConnectException(message: String) extends ChiselException(message)
+  case class MonoConnectException(message: String) extends ChiselException(message)
+}