4 files changed, 53 insertions, 0 deletions
diff --git a/src/main/scala/chisel3/compatibility/FileSystemUtilities.scala b/src/main/scala/chisel3/compatibility/FileSystemUtilities.scala
new file mode 100644
index 00000000..d12e627d
--- /dev/null
+++ b/src/main/scala/chisel3/compatibility/FileSystemUtilities.scala
@@ -0,0 +1,12 @@
+// See LICENSE for license details.
+
+package chisel.compatibility
+
+import chisel._
+
+@deprecated("FileSystemUtilities doesn't exist in chisel3", "3.0.0")
+trait FileSystemUtilities {
+  def createOutputFile(name: String): java.io.FileWriter  = {
+    new java.io.FileWriter(Driver.targetDir + "/" + name)
+  }
+}
diff --git a/src/main/scala/chisel3/compatibility/Main.scala b/src/main/scala/chisel3/compatibility/Main.scala
new file mode 100644
index 00000000..9072bfcf
--- /dev/null
+++ b/src/main/scala/chisel3/compatibility/Main.scala
@@ -0,0 +1,19 @@
+// See LICENSE for license details.
+
+package chisel.compatibility
+
+import java.io.File
+
+import chisel._
+
+@deprecated("chiselMain doesn't exist in Chisel3", "3.0") object chiselMain {
+  def apply[T <: Module](args: Array[String], gen: () => T): Unit =
+    Predef.assert(false, "No more chiselMain in Chisel3")
+
+  def run[T <: Module] (args: Array[String], gen: () => T): Unit = {
+    val circuit = Driver.elaborate(gen)
+    Driver.parseArgs(args)
+    val output_file = new File(Driver.targetDir + "/" + circuit.name + ".fir")
+    Driver.dumpFirrtl(circuit, Option(output_file))
+  }
+}
diff --git a/src/main/scala/chisel3/compatibility/debug.scala b/src/main/scala/chisel3/compatibility/debug.scala
new file mode 100644
index 00000000..8850c76b
--- /dev/null
+++ b/src/main/scala/chisel3/compatibility/debug.scala
@@ -0,0 +1,8 @@
+package chisel.compatibility
+
+import chisel.core._
+
+@deprecated("debug doesn't do anything in Chisel3 as no pruning happens in the frontend", "chisel3")
+object debug {  // scalastyle:ignore object.name
+  def apply (arg: Data): Data = arg
+}
diff --git a/src/main/scala/chisel3/compatibility/throwException.scala b/src/main/scala/chisel3/compatibility/throwException.scala
new file mode 100644
index 00000000..3b9fd06e
--- /dev/null
+++ b/src/main/scala/chisel3/compatibility/throwException.scala
@@ -0,0 +1,14 @@
+// See LICENSE for license details.
+
+package chisel.compatibility
+
+import chisel._
+
+@deprecated("throwException doesn't exist in Chisel3", "3.0.0")
+@throws(classOf[Exception])
+object throwException {
+  def apply(s: String, t: Throwable = null) = {
+    val xcpt = new Exception(s, t)
+    throw xcpt
+  }
+}