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package Chisel
import scala.util.DynamicVariable
import scala.collection.mutable.{ArrayBuffer, HashMap}
private class Namespace(parent: Option[Namespace], kws: Option[Set[String]]) {
private var i = 0L
private val names = collection.mutable.HashSet[String]()
private val keywords = kws.getOrElse(Set())
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 = {
val res = if(this contains elem) rename(elem) else elem
names += res
res
}
def child(kws: Option[Set[String]]): Namespace = new Namespace(Some(this), kws)
def child: Namespace = new Namespace(Some(this), None)
}
private class FIRRTLNamespace extends Namespace(None, Some(Set("mem", "node", "wire", "reg", "inst")))
private class IdGen {
private var counter = -1L
def next: Long = {
counter += 1
counter
}
}
private[Chisel] trait HasId {
private[Chisel] val _id = Builder.idGen.next
def setRef() = Builder.globalRefMap.setRef(this, s"T_${_id}")
def setRef(imm: Immediate) = Builder.globalRefMap.setRef(this, imm)
def setRef(name: String) = Builder.globalRefMap.setRef(this, name)
def setRef(parent: HasId, name: String) = Builder.globalRefMap.setField(parent, this, name)
def setRef(parent: HasId, index: Int) = Builder.globalRefMap.setIndex(parent, this, index)
}
class RefMap {
private val _refmap = new HashMap[Long,Immediate]()
def setRef(id: HasId, ref: Immediate): Unit =
_refmap(id._id) = ref
def setRef(id: HasId, name: String): Unit =
if (!_refmap.contains(id._id)) setRef(id, Ref(name))
def setField(parentid: HasId, id: HasId, name: String): Unit = {
_refmap(id._id) = Slot(Alias(parentid), name)
}
def setIndex(parentid: HasId, id: HasId, index: Int): Unit =
_refmap(id._id) = Index(Alias(parentid), index)
def apply(id: HasId): Immediate = _refmap(id._id)
}
private class DynamicContext {
val idGen = new IdGen
val globalNamespace = new FIRRTLNamespace
val globalRefMap = new RefMap
val components = ArrayBuffer[Component]()
val currentModuleVar = new DynamicVariable[Option[Module]](None)
val currentParamsVar = new DynamicVariable[Parameters](Parameters.empty)
val parameterDump = new ParameterDump
def getCurrentModule = currentModuleVar.value
def moduleScope[T](body: => T): T = {
currentModuleVar.withValue(getCurrentModule)(body)
}
def forceCurrentModule[T](m: Module) { // Used in Module constructor
currentModuleVar.value = Some(m)
}
def pushCommand(c: Command) {
currentModuleVar.value.foreach(_._commands += c)
}
def getParams: Parameters = currentParamsVar.value
def paramsScope[T](p: Parameters)(body: => T): T = {
currentParamsVar.withValue(p)(body)
}
}
private object Builder {
// All global mutable state must be referenced via dynamicContextVar!!
private val dynamicContextVar = new DynamicVariable[Option[DynamicContext]](None)
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(c: Command) = dynamicContext.pushCommand(c)
def pushOp[T <: Data](cmd: DefPrim[T]) = {
pushCommand(cmd)
cmd.id
}
def build[T <: Module](f: => T): Circuit = {
dynamicContextVar.withValue(Some(new DynamicContext)) {
val mod = f
mod.setRef(globalNamespace.name(mod.name))
Circuit(components.last.name, components, globalRefMap, parameterDump)
}
}
}
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