Exceptions while generating C++ Backend

[Arka Maity]

Hi Everyone,
                    I am encountering a strange "java.lang.StringIndexOutOfBoundsException: String index out of range: 4" after the "[info] [27.087] NO COMBINATIONAL LOOP FOUND" statement, while generating the C++ Backend. I am using Array("--backend", "c", "--genHarness", "--targetDir", "cppBackend","--compile", "--test", "--Wall","--debug") as the first argument for ChiselMainTest method. I do not encounter such errors while generating the Verilog Backend.

                    My source code is huge and spans multiple files. Just wondering if anyone has any clue about this issue.

sincerely Arka

[Kamyar Mohajerani]

hi,
could u at least include the stack trace? what version of chisel are u building with?

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[Arka Maity]

Hi,
     Apologies for being vague. I am using the latest chisel release (whatever that is), by specifying "latest.release" in my build.sbt. The stack trace is given below

CPP elaborate
[info] [15.123] // COMPILING < (class MM_IP_NoC.FabricWrapper)>(33)
[info] [16.397] giving names
[info] [17.607] executing custom transforms
[info] [17.608] adding clocks and resets
[info] [18.321] inferring widths
[info] [20.059] checking widths
[info] [20.795] lowering complex nodes to primitives
[info] [20.795] removing type nodes
[info] [21.367] compiling 314255 nodes
[info] [21.367] computing memory ports
[info] [22.384] resolving nodes to the components
[info] [26.108] creating clock domains
[info] [26.479] pruning unconnected IOs
[info] [26.528] checking for unconnected ports
[info] [26.563] checking for combinational loops
[info] [26.969] NO COMBINATIONAL LOOP FOUND
[error] (run-main-0) java.lang.StringIndexOutOfBoundsException: String index out of range: 4

java.lang.StringIndexOutOfBoundsException: String index out of range: 4

    at java.lang.String.charAt(String.java:658)
    at scala.collection.immutable.StringLike$class.apply(StringLike.scala:53)
    at scala.collection.immutable.WrappedString.apply(WrappedString.scala:31)
    at scala.collection.immutable.WrappedString.apply(WrappedString.scala:31)
    at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
    at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
    at scala.collection.immutable.Range.foreach(Range.scala:141)
    at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
    at scala.collection.AbstractTraversable.map(Traversable.scala:105)
    at Chisel.Backend.genIndent(Backend.scala:721)
    at Chisel.Backend$$anonfun$printStack$1.apply(Backend.scala:724)
    at Chisel.Backend$$anonfun$printStack$1.apply(Backend.scala:723)
    at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
    at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
    at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
    at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
    at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
    at scala.collection.AbstractTraversable.map(Traversable.scala:105)
    at Chisel.Backend.printStack(Backend.scala:723)
    at Chisel.Backend.elaborate(Backend.scala:920)
    at Chisel.CppBackend.elaborate(Cpp.scala:1360)
    at Chisel.Driver$.execute(Driver.scala:92)
    at Chisel.Driver$.apply(Driver.scala:40)
    at Chisel.Driver$.apply(Driver.scala:51)
    at Chisel.chiselMain$.apply(hcl.scala:63)
    at Chisel.chiselMainTest$.apply(hcl.scala:76)
    at MM_IP_NoC.MM_IP_NoC$.main(main.scala:111)
    at MM_IP_NoC.MM_IP_NoC.main(main.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
[trace] Stack trace suppressed: run last MM_IP_NoC/compile:run for the full output.
java.lang.RuntimeException: Nonzero exit code: 1
    at scala.sys.package$.error(package.scala:27)
[trace] Stack trace suppressed: run last MM_IP_NoC/compile:run for the full output.
[error] (MM_IP_NoC/compile:run) Nonzero exit code: 1

The main.scala from MM_IP_NoC package belongs me. The line 111 from main scala which throws this error
contains

110         case "FabricWrapperTest" => ( chiselMainTest(myargs, moduleToTest)                         
111                       { c => new FabricWrapperTest(c.asInstanceOf[FabricWrapper]) } )

where, moduleToTest = () => Module(new FabricWrapper(TestParams.SRC, TestParams.DST)).

I am meanwhile trying to reproduce the exception for a simple case. I would post the source code, if I able to come up with one.

sincerely Arka

[Donggyu Kim]

Hi Arka,

First of all, please check it works without '--Wall'. I have examined the function causing the problem, but it is a very simple function and I cannot reproduce this bug with scala 2.11. Try it with scala 2.11, and let me know if you still have the same problem.

Thanks,

Donggyu

[Arka Maity]

Hi Donggyu,

                  Thanks a lot for your response. The code compiles successfully without --Wall option, and I am getting expected results.

                   I tried next with "--Wall" option but with an added "scalaVersion := 2.11.4", in my build.sbt file. I get some other exception sbt.ResolveException, I am trying to figure out how to debug this . btw what version of scala is used by default ?

Arka

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[Arka Maity]

Hi Donggyu,

                  Well I resolved the sbt exception, but I do get the same error message with scalaVersion := 2.11.4 with --Wall option enabled.

                  Is it something to do with any bug in my code?

Arka

[Donggyu Kim]

I doubt it's a scala bug because you got the error from a very trivial function. Let us find a way to avoid it for the next release.