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package Chisel
import scala.util.DynamicVariable
import scala.collection.mutable.{ArrayBuffer, HashMap}
private class Namespace(parent: Option[Namespace], keywords: Set[String]) {
private var i = 0L
private val names = collection.mutable.HashSet[String]()
private def rename(n: String) = { i += 1; s"${n}_${i}" }
def contains(elem: String): Boolean = {
keywords.contains(elem) || names.contains(elem) ||
parent.map(_ contains elem).getOrElse(false)
}
def name(elem: String): String = {
if (this contains elem) {
name(rename(elem))
} else {
names += elem
elem
}
}
def child(kws: Set[String]): Namespace = new Namespace(Some(this), kws)
def child: Namespace = child(Set())
}
private class IdGen {
private var counter = -1L
def next: Long = {
counter += 1
counter
}
}
private[Chisel] trait HasId {
private[Chisel] def _onModuleClose {}
private[Chisel] val _parent = Builder.dynamicContext.currentModule
_parent.foreach(_.addId(this))
private[Chisel] val _refMap = Builder.globalRefMap
private[Chisel] val _id = Builder.idGen.next
private[Chisel] def setRef(imm: Arg) = _refMap.setRef(this, imm)
private[Chisel] def setRef(name: String) = _refMap.setRef(this, name)
private[Chisel] def setRef(parent: HasId, name: String) = _refMap.setField(parent, this, name)
private[Chisel] def setRef(parent: HasId, index: Int) = _refMap.setIndex(parent, this, index)
private[Chisel] def getRef = _refMap(this)
}
class RefMap {
private val _refmap = new HashMap[Long,Arg]()
private[Chisel] def setRef(id: HasId, ref: Arg): Unit =
_refmap(id._id) = ref
private[Chisel] def setRef(id: HasId, name: String): Unit =
if (!_refmap.contains(id._id)) setRef(id, Ref(name))
private[Chisel] def setField(parentid: HasId, id: HasId, name: String): Unit =
_refmap(id._id) = Slot(Node(parentid), name)
private[Chisel] def setIndex(parentid: HasId, id: HasId, index: Int): Unit =
_refmap(id._id) = Index(Node(parentid), index)
def apply(id: HasId): Arg = _refmap(id._id)
}
private class DynamicContext {
val idGen = new IdGen
val globalNamespace = new Namespace(None, Set())
val globalRefMap = new RefMap
val components = ArrayBuffer[Component]()
var currentModule: Option[Module] = None
val parameterDump = new ParameterDump
val errors = new ErrorLog
}
private object Builder {
// All global mutable state must be referenced via dynamicContextVar!!
private val dynamicContextVar = new DynamicVariable[Option[DynamicContext]](None)
private val currentParamsVar = new DynamicVariable[Parameters](Parameters.empty)
def dynamicContext = dynamicContextVar.value.get
def idGen = dynamicContext.idGen
def globalNamespace = dynamicContext.globalNamespace
def globalRefMap = dynamicContext.globalRefMap
def components = dynamicContext.components
def parameterDump = dynamicContext.parameterDump
def pushCommand[T <: Command](c: T) = {
dynamicContext.currentModule.foreach(_._commands += c)
c
}
def pushOp[T <: Data](cmd: DefPrim[T]) = pushCommand(cmd).id
def errors = dynamicContext.errors
def error(m: => String) = errors.error(m)
def getParams: Parameters = currentParamsVar.value
def paramsScope[T](p: Parameters)(body: => T): T = {
currentParamsVar.withValue(p)(body)
}
def build[T <: Module](f: => T): Circuit = {
dynamicContextVar.withValue(Some(new DynamicContext)) {
errors.info("Elaborating design...")
val mod = f
mod.setRef(globalNamespace.name(mod.name))
errors.checkpoint()
errors.info("Done elaborating.")
Circuit(components.last.name, components, globalRefMap, parameterDump)
}
}
}
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