Fix naming of unwrapped val io in Chisel.Modules (#2150)

The removal of virtual method io accidentally made the naming of io in
compatibility mode Bundles sensitive to the prefix at the time of the
first access of the field. It also made .suggestName able to override
the name. This commit fixes that issue by forcing the name of the io
Data to be "io" no matter what.

1 files changed, 28 insertions, 0 deletions

diff --git a/src/test/scala/chiselTests/CompatibilitySpec.scala b/src/test/scala/chiselTests/CompatibilitySpec.scala
index bf8cd3fc..ccf287a6 100644
--- a/src/test/scala/chiselTests/CompatibilitySpec.scala
+++ b/src/test/scala/chiselTests/CompatibilitySpec.scala
@@ -564,4 +564,32 @@ class CompatibiltySpec extends ChiselFlatSpec with ScalaCheckDrivenPropertyCheck
     verilog should include ("assign io_out_0 = io_in_0;")
   }
 
+  it should "ignore .suggestName on field io" in {
+    class MyModule extends Module {
+      val io = new Bundle {
+        val foo = UInt(width = 8).asInput
+        val bar = UInt(width = 8).asOutput
+      }
+      io.suggestName("potato")
+      io.bar := io.foo
+    }
+    val verilog = ChiselStage.emitVerilog(new MyModule)
+    verilog should include ("input  [7:0] io_foo")
+    verilog should include ("output [7:0] io_bar")
+  }
+
+  it should "properly name field io" in {
+    class MyModule extends Module {
+      val io = new Bundle {
+        val foo = UInt(width = 8).asInput
+        val bar = UInt(width = 8).asOutput
+      }
+      val wire = Wire(init = io.foo)
+      io.bar := wire
+    }
+    val verilog = ChiselStage.emitVerilog(new MyModule)
+    verilog should include ("input  [7:0] io_foo")
+    verilog should include ("output [7:0] io_bar")
+  }
+
 }