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// SPDX-License-Identifier: Apache-2.0
package firrtl.passes
package clocklist
import firrtl._
import firrtl.ir._
import Utils._
import Mappers._
/** Remove all statements and ports (except instances/whens/blocks) whose
* expressions do not relate to ground types.
*/
object RemoveAllButClocks extends Pass {
def onStmt(s: Statement): Statement = (s.map(onStmt)) match {
case DefWire(i, n, ClockType) => s
case DefNode(i, n, value) if value.tpe == ClockType => s
case Connect(i, l, r) if l.tpe == ClockType => s
case sx: DefInstance => sx
case sx: Block => sx
case sx: Conditionally => sx
case _ => EmptyStmt
}
def onModule(m: DefModule): DefModule = m match {
case Module(i, n, ps, b) => Module(i, n, ps.filter(_.tpe == ClockType), squashEmpty(onStmt(b)))
case ExtModule(i, n, ps, dn, p) => ExtModule(i, n, ps.filter(_.tpe == ClockType), dn, p)
}
def run(c: Circuit): Circuit = c.copy(modules = c.modules.map(onModule))
}
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