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[3.4.0-RC1] missing reference

See original GitHub issue

I have this example circuit: https://scastie.scala-lang.org/XSpo4Q6kRnO2LCO4mKtW4w

It elaborates successfully with Chisel 3.3.x but on 3.4.0-RC1 I get an internal error where Chisel is trying to get the value of a _ref which is None:

Caused by: java.util.NoSuchElementException: None.get
	at scala.None$.get(Option.scala:529)
	at scala.None$.get(Option.scala:527)
	at chisel3.internal.HasId.getRef(Builder.scala:228)
	at chisel3.internal.HasId.getRef$(Builder.scala:228)
	at chisel3.experimental.BaseModule.getRef(Module.scala:162)
	at chisel3.internal.HasId.recArg$1(Builder.scala:162)
	at chisel3.internal.HasId.$anonfun$computeName$5(Builder.scala:164)
	at scala.Option.flatMap(Option.scala:271)
	at chisel3.internal.HasId.buildAggName$1(Builder.scala:164)
	at chisel3.internal.HasId.$anonfun$computeName$6(Builder.scala:177)
	at scala.collection.immutable.List.foreach(List.scala:392)
	at chisel3.internal.HasId.buildName$1(Builder.scala:174)
	at chisel3.internal.HasId.computeName(Builder.scala:188)
	at chisel3.internal.HasId.computeName$(Builder.scala:151)
	at chisel3.Data.computeName(Data.scala:275)
	at chisel3.RawModule.$anonfun$namePorts$1(RawModule.scala:45)
	at chisel3.RawModule.$anonfun$namePorts$1$adapted(RawModule.scala:44)
	at scala.collection.mutable.ResizableArray.foreach(ResizableArray.scala:62)
	at scala.collection.mutable.ResizableArray.foreach$(ResizableArray.scala:55)
	at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:49)
	at chisel3.RawModule.namePorts(RawModule.scala:44)
	at chisel3.RawModule.generateComponent(RawModule.scala:68)
	at chisel3.Module$.do_apply(Module.scala:69)
	at chisel3.stage.ChiselGeneratorAnnotation.$anonfun$elaborate$1(ChiselAnnotations.scala:60)
	at chisel3.internal.Builder$.$anonfun$build$1(Builder.scala:625)
	at scala.util.DynamicVariable.withValue(DynamicVariable.scala:62)
	at chisel3.internal.Builder$.build(Builder.scala:622)
	at chisel3.stage.ChiselGeneratorAnnotation.elaborate(ChiselAnnotations.scala:60)

The circuit was working with an earlier SNAPSHOT release of 3.4 so this regression seems like it was recently introduced.

Issue Analytics

State:
Created 3 years ago
Comments:7 (7 by maintainers)

Top GitHub Comments

1reaction

ekiwicommented, Sep 22, 2020

I don’t think this has anything to do with RC2, this is just an open bug that is not yet fixed.

Yes, I just wanted to call attention to it.

This seems to be a regression since this circuit works with Chisel 3.3

0reactions

jackkoenigcommented, Feb 9, 2021

Randomly came across this, it has been fixed since 3.4.1 and remains fixed in 3.4.2.

See same example with 3.4.2 working: https://scastie.scala-lang.org/lhXp0aEsRsq2ho5F7Jw9vA

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