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// See LICENSE for license details.
package firrtl.passes
import firrtl._
import firrtl.ir._
import firrtl.Mappers._
import firrtl.options.Dependency
object ResolveFlows extends Pass {
override def prerequisites =
Seq( Dependency(passes.ResolveKinds),
Dependency(passes.InferTypes),
Dependency(passes.Uniquify) ) ++ firrtl.stage.Forms.WorkingIR
override def invalidates(a: Transform) = false
def resolve_e(g: Flow)(e: Expression): Expression = e match {
case ex: WRef => ex copy (flow = g)
case WSubField(exp, name, tpe, _) => WSubField(
Utils.field_flip(exp.tpe, name) match {
case Default => resolve_e(g)(exp)
case Flip => resolve_e(Utils.swap(g))(exp)
}, name, tpe, g)
case WSubIndex(exp, value, tpe, _) =>
WSubIndex(resolve_e(g)(exp), value, tpe, g)
case WSubAccess(exp, index, tpe, _) =>
WSubAccess(resolve_e(g)(exp), resolve_e(SourceFlow)(index), tpe, g)
case _ => e map resolve_e(g)
}
def resolve_s(s: Statement): Statement = s match {
//TODO(azidar): pretty sure don't need to do anything for Attach, but not positive...
case IsInvalid(info, expr) =>
IsInvalid(info, resolve_e(SinkFlow)(expr))
case Connect(info, loc, expr) =>
Connect(info, resolve_e(SinkFlow)(loc), resolve_e(SourceFlow)(expr))
case PartialConnect(info, loc, expr) =>
PartialConnect(info, resolve_e(SinkFlow)(loc), resolve_e(SourceFlow)(expr))
case sx => sx map resolve_e(SourceFlow) map resolve_s
}
def resolve_flow(m: DefModule): DefModule = m map resolve_s
def run(c: Circuit): Circuit =
c copy (modules = c.modules map resolve_flow)
}
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