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// SPDX-License-Identifier: Apache-2.0
package chisel3.testers
import TesterDriver.createTestDirectory
import chisel3._
import chisel3.stage._
import firrtl.AnnotationSeq
import firrtl.annotations.NoTargetAnnotation
import firrtl.options.TargetDirAnnotation
import treadle.stage.TreadleTesterPhase
import treadle.executable.StopException
import treadle.{CallResetAtStartupAnnotation, TreadleTesterAnnotation, WriteVcdAnnotation}
import java.io.File
case object TreadleBackend extends TesterDriver.Backend {
val MaxTreadleCycles = 10000L
def execute(
t: () => BasicTester,
additionalVResources: Seq[String] = Seq(),
annotations: AnnotationSeq = Seq(),
nameHint: Option[String] = None
): Boolean = {
val generatorAnnotation = chisel3.stage.ChiselGeneratorAnnotation(t)
// This provides an opportunity to translate from top level generic flags to backend specific annos
var annotationSeq = annotations :+ WriteVcdAnnotation
// This produces a chisel circuit annotation, a later pass will generate a firrtl circuit
// Can't do both at once currently because generating the latter deletes the former
annotationSeq = (new chisel3.stage.phases.Elaborate).transform(annotationSeq :+ generatorAnnotation)
val circuit = annotationSeq.collect { case x: ChiselCircuitAnnotation => x }.head.circuit
val targetName: File = createTestDirectory(circuit.name)
if (!annotationSeq.exists(_.isInstanceOf[NoTargetAnnotation])) {
annotationSeq = annotationSeq :+ TargetDirAnnotation(targetName.getPath)
}
if (!annotationSeq.exists { case CallResetAtStartupAnnotation => true; case _ => false }) {
annotationSeq = annotationSeq :+ CallResetAtStartupAnnotation
}
// This generates the firrtl circuit needed by the TreadleTesterPhase
annotationSeq = (new ChiselStage).run(
annotationSeq ++ Seq(NoRunFirrtlCompilerAnnotation)
)
// This generates a TreadleTesterAnnotation with a treadle tester instance
annotationSeq = (new TreadleTesterPhase).transform(annotationSeq)
val treadleTester = annotationSeq.collectFirst { case TreadleTesterAnnotation(t) => t }.getOrElse(
throw new Exception(
s"TreadleTesterPhase could not build a treadle tester from these annotations" +
annotationSeq.mkString("Annotations:\n", "\n ", "")
)
)
try {
var cycle = 0L
while (cycle < MaxTreadleCycles) {
cycle += 1
treadleTester.step()
}
throw new ChiselException(s"Treadle backend exceeded MaxTreadleCycles ($MaxTreadleCycles)")
} catch {
case _: StopException =>
}
treadleTester.finish
treadleTester.getStopResult match {
case None => true
case Some(0) => true
case _ => false
}
}
}
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