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// See LICENSE for license details.
package firrtl
package passes
import firrtl.ir._
import firrtl.Mappers._
import firrtl.Utils.{kind, flow, get_info}
// Datastructures
import scala.collection.mutable
// Splits compound expressions into simple expressions
// and named intermediate nodes
object SplitExpressions extends Pass {
private def onModule(m: Module): Module = {
val namespace = Namespace(m)
def onStmt(s: Statement): Statement = {
val v = mutable.ArrayBuffer[Statement]()
// Splits current expression if needed
// Adds named temporaries to v
def split(e: Expression): Expression = e match {
case e: DoPrim =>
val name = namespace.newTemp
v += DefNode(get_info(s), name, e)
WRef(name, e.tpe, kind(e), flow(e))
case e: Mux =>
val name = namespace.newTemp
v += DefNode(get_info(s), name, e)
WRef(name, e.tpe, kind(e), flow(e))
case e: ValidIf =>
val name = namespace.newTemp
v += DefNode(get_info(s), name, e)
WRef(name, e.tpe, kind(e), flow(e))
case _ => e
}
// Recursive. Splits compound nodes
def onExp(e: Expression): Expression =
e map onExp match {
case ex: DoPrim => ex map split
case ex => ex
}
s map onExp match {
case x: Block => x map onStmt
case EmptyStmt => EmptyStmt
case x =>
v += x
v.size match {
case 1 => v.head
case _ => Block(v.toSeq)
}
}
}
Module(m.info, m.name, m.ports, onStmt(m.body))
}
def run(c: Circuit): Circuit = {
val modulesx = c.modules map {
case m: Module => onModule(m)
case m: ExtModule => m
}
Circuit(c.info, modulesx, c.main)
}
}
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