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plusarg_reader : Add the ability to add a documentation string.

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This commit is contained in:
Megan Wachs 2017-06-05 16:16:52 -07:00
parent 274d908d98
commit 8440c4b1c4
1 changed files with 8 additions and 4 deletions
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12
src/main/scala/util/PlusArg.scala
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@ -3,19 +3,23 @@
package util
import Chisel._
class plusarg_reader(format: String, default: Int) extends BlackBox(Map(
class plusarg_reader(val format: String, val default: Int, val docstring: String) extends BlackBox(Map(
"FORMAT" -> chisel3.core.StringParam(format),
"DEFAULT" -> chisel3.core.IntParam(default))) {
val io = new Bundle {
val out = UInt(OUTPUT, width = 32)
}
}
object PlusArg
{
// PlusArg("foo") will return 42 if the simulation is run with +foo=42
// PlusArg("foo") will return 42.U if the simulation is run with +foo=42
// Do not use this as an initial register value. The value is set in an
// initial block and thus accessing it from another initial is racey.
def apply(name: String, default: Int = 0): UInt =
Module(new plusarg_reader(name + "=%d", default)).io.out
// Add a docstring to document the arg, which can be dumped in elaboration
// pass.
def apply(name: String, default: Int = 0, docstring: String = ""): UInt =
Module(new plusarg_reader(name + "=%d", default, docstring)).io.out
}