how to read the firrtl stack trace

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Jerry Ho

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Oct 25, 2020, 11:00:43 AM10/25/20
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I was learning chisel, and wrote some buggy code:
class Hello extends Module{

val io = IO(new Bundle() {
val in_1 = UInt(32.W)
val in_2 = UInt(32.W)
val out = UInt(64.W)

})
val reg_1 = RegInit(io.in_1)
val reg_2 = RegInit(io.in_2)

val result = Wire(UInt(64.W))
result := reg_1 * reg_2
io.out :=  result   

}


object Hello extends App{
chisel3.Driver.execute(Array[String](), () => new Hello())
}

and when I run the sbt run, the firrtl complains the following:



[info] running Hello [info] [0.003] Elaborating design... [error] (run-main-0) firrtl.options.OptionsException: Exception thrown when elaborating ChiselGeneratorAnnotation [error] firrtl.options.OptionsException: Exception thrown when elaborating ChiselGeneratorAnnotation [error] at chisel3.stage.ChiselGeneratorAnnotation.elaborate(ChiselAnnotations.scala:55) [error] at chisel3.stage.phases.Elaborate.$anonfun$transform$1(Elaborate.scala:19) [error] at scala.collection.TraversableLike.$anonfun$flatMap$1(TraversableLike.scala:244) [error] at scala.collection.immutable.List.foreach(List.scala:392) [error] at scala.collection.TraversableLike.flatMap(TraversableLike.scala:244) [error] at scala.collection.TraversableLike.flatMap$(TraversableLike.scala:241) [error] at scala.collection.immutable.List.flatMap(List.scala:355) [error] at chisel3.stage.phases.Elaborate.transform(Elaborate.scala:18) [error] at chisel3.stage.phases.Elaborate.transform(Elaborate.scala:16) [error] at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:32) [error] at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:15) [error] at firrtl.options.Translator.transform(Phase.scala:140) [error] at firrtl.options.Translator.transform$(Phase.scala:140) [error] at firrtl.options.phases.DeletedWrapper.transform(DeletedWrapper.scala:15) [error] at chisel3.stage.ChiselStage.$anonfun$run$2(ChiselStage.scala:33) [error] at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126) [error] at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122) [error] at scala.collection.immutable.List.foldLeft(List.scala:89) [error] at chisel3.stage.ChiselStage.run(ChiselStage.scala:33) [error] at firrtl.options.Stage$$anon$1.transform(Stage.scala:43) [error] at firrtl.options.Stage$$anon$1.transform(Stage.scala:43) [error] at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:32) [error] at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:15) [error] at firrtl.options.Translator.transform(Phase.scala:140) [error] at firrtl.options.Translator.transform$(Phase.scala:140) [error] at firrtl.options.phases.DeletedWrapper.transform(DeletedWrapper.scala:15) [error] at firrtl.options.Stage.$anonfun$transform$5(Stage.scala:46) [error] at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126) [error] at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122) [error] at scala.collection.immutable.List.foldLeft(List.scala:89) [error] at firrtl.options.Stage.$anonfun$transform$3(Stage.scala:46) [error] at logger.Logger$.$anonfun$makeScope$2(Logger.scala:168) [error] at scala.util.DynamicVariable.withValue(DynamicVariable.scala:62) [error] at logger.Logger$.makeScope(Logger.scala:166) [error] at firrtl.options.Stage.transform(Stage.scala:46) [error] at firrtl.options.Stage.transform(Stage.scala:17) [error] at chisel3.Driver$.$anonfun$execute$1(Driver.scala:226) [error] at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126) [error] at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122) [error] at scala.collection.immutable.List.foldLeft(List.scala:89) [error] at chisel3.Driver$.execute(Driver.scala:226) [error] at chisel3.Driver$.execute(Driver.scala:249) [error] at Hello$.delayedEndpoint$Hello$1(Hello.scala:36) [error] at Hello$delayedInit$body.apply(Hello.scala:35) [error] at scala.Function0.apply$mcV$sp(Function0.scala:39) [error] at scala.Function0.apply$mcV$sp$(Function0.scala:39) [error] at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:17) [error] at scala.App.$anonfun$main$1$adapted(App.scala:80) [error] at scala.collection.immutable.List.foreach(List.scala:392) [error] at scala.App.main(App.scala:80) [error] at scala.App.main$(App.scala:78) [error] at Hello$.main(Hello.scala:35) [error] at Hello.main(Hello.scala) [error] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [error] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [error] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [error] at java.base/java.lang.reflect.Method.invoke(Method.java:566) [error] Caused by: java.lang.RuntimeException: Unexpected port element direction 'Unspecified' [error] at chisel3.internal.BindingDirection$.from(Binding.scala:54) [error] at chisel3.internal.MonoConnect$.elemConnect(MonoConnect.scala:184) [error] at chisel3.internal.MonoConnect$.connect(MonoConnect.scala:83) [error] at chisel3.Data.connect(Data.scala:384) [error] at chisel3.Data.$colon$eq(Data.scala:475) [error] at Hello.<init>(Hello.scala:30) [error] at Hello$.$anonfun$new$1(Hello.scala:36) [error] at chisel3.Module$.do_apply(Module.scala:52) [error] at chisel3.stage.ChiselGeneratorAnnotation.$anonfun$elaborate$1(ChiselAnnotations.scala:50) [error] at chisel3.internal.Builder$.$anonfun$build$2(Builder.scala:406) [error] at scala.util.DynamicVariable.withValue(DynamicVariable.scala:62) [error] at chisel3.internal.Builder$.$anonfun$build$1(Builder.scala:404) [error] at scala.util.DynamicVariable.withValue(DynamicVariable.scala:62) [error] at chisel3.internal.Builder$.build(Builder.scala:404) [error] at chisel3.stage.ChiselGeneratorAnnotation.elaborate(ChiselAnnotations.scala:50) [error] at chisel3.stage.phases.Elaborate.$anonfun$transform$1(Elaborate.scala:19) [error] at scala.collection.TraversableLike.$anonfun$flatMap$1(TraversableLike.scala:244) [error] at scala.collection.immutable.List.foreach(List.scala:392) [error] at scala.collection.TraversableLike.flatMap(TraversableLike.scala:244) [error] at scala.collection.TraversableLike.flatMap$(TraversableLike.scala:241) [error] at scala.collection.immutable.List.flatMap(List.scala:355) [error] at chisel3.stage.phases.Elaborate.transform(Elaborate.scala:18) [error] at chisel3.stage.phases.Elaborate.transform(Elaborate.scala:16) [error] at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:32) [error] at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:15) [error] at firrtl.options.Translator.transform(Phase.scala:140) [error] at firrtl.options.Translator.transform$(Phase.scala:140) [error] at firrtl.options.phases.DeletedWrapper.transform(DeletedWrapper.scala:15) [error] at chisel3.stage.ChiselStage.$anonfun$run$2(ChiselStage.scala:33) [error] at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126) [error] at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122) [error] at scala.collection.immutable.List.foldLeft(List.scala:89) [error] at chisel3.stage.ChiselStage.run(ChiselStage.scala:33) [error] at firrtl.options.Stage$$anon$1.transform(Stage.scala:43) [error] at firrtl.options.Stage$$anon$1.transform(Stage.scala:43) [error] at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:32) [error] at firrtl.options.phases.DeletedWrapper.internalTransform(DeletedWrapper.scala:15) [error] at firrtl.options.Translator.transform(Phase.scala:140) [error] at firrtl.options.Translator.transform$(Phase.scala:140) [error] at firrtl.options.phases.DeletedWrapper.transform(DeletedWrapper.scala:15) [error] at firrtl.options.Stage.$anonfun$transform$5(Stage.scala:46) [error] at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126) [error] at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122) [error] at scala.collection.immutable.List.foldLeft(List.scala:89) [error] at firrtl.options.Stage.$anonfun$transform$3(Stage.scala:46) [error] at logger.Logger$.$anonfun$makeScope$2(Logger.scala:168) [error] at scala.util.DynamicVariable.withValue(DynamicVariable.scala:62) [error] at logger.Logger$.makeScope(Logger.scala:166) [error] at firrtl.options.Stage.transform(Stage.scala:46) [error] at firrtl.options.Stage.transform(Stage.scala:17) [error] at chisel3.Driver$.$anonfun$execute$1(Driver.scala:226) [error] at scala.collection.LinearSeqOptimized.foldLeft(LinearSeqOptimized.scala:126) [error] at scala.collection.LinearSeqOptimized.foldLeft$(LinearSeqOptimized.scala:122) [error] at scala.collection.immutable.List.foldLeft(List.scala:89) [error] at chisel3.Driver$.execute(Driver.scala:226) [error] at chisel3.Driver$.execute(Driver.scala:249) [error] at Hello$.delayedEndpoint$Hello$1(Hello.scala:36) [error] at Hello$delayedInit$body.apply(Hello.scala:35) [error] at scala.Function0.apply$mcV$sp(Function0.scala:39) [error] at scala.Function0.apply$mcV$sp$(Function0.scala:39) [error] at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:17) [error] at scala.App.$anonfun$main$1$adapted(App.scala:80) [error] at scala.collection.immutable.List.foreach(List.scala:392) [error] at scala.App.main(App.scala:80) [error] at scala.App.main$(App.scala:78) [error] at Hello$.main(Hello.scala:35) [error] at Hello.main(Hello.scala) [error] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [error] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [error] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [error] at java.base/java.lang.reflect.Method.invoke(Method.java:566) [error] stack trace is suppressed; run 'last Compile / bgRun' for the full output [error] Nonzero exit code: 1 [error] (Compile / run) Nonzero exit code: 1 [error] Total time: 3 s


and it took me lots of time to figure out that I left out the Input() and Output()call inside the Iodef, but the firrtl's stack trace is very confusing for me to figure this simple mistake out.I wonder if there are some best practice for me to follow when reading the firrtl stack trace.

Jack Koenig

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Oct 25, 2020, 3:39:02 PM10/25/20
to RISC-V HW Dev
I've answered this question on chisel-users which I feel is a better venue: https://groups.google.com/g/chisel-users/c/vHCA1YxN25Q/m/JC7zIkTWBAAJ

~Jack

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