syntax error(s) when parsing low Firrtl

[wky17]

when I try to parser Accumulator low Firrtl code through treadle, 2 syntax error(s) detected.

the low Firrtl code:

val accuFirrtl1: String =
      s"""
         |circuit fib :
         |  module fib :
         |    input go : UInt<1>
         |    input reset : UInt<1>
         |    input clk : Clock
         |    output out : UInt<4>
         |
         |    reg n : UInt<4>, clk with :
         |      reset => (UInt<1>("h0"), n)
         |    node _T_11 = add ( n,go )
         |    node _T_12 = tail ( _T_11 , 1 )
         |    out <= n
         |    n <= mux(reset, UInt<4>("h0"), _T_12)
         |    """.stripMargin

when I try to parse it using: TreadleTestHarness(Seq(FirrtlSourceAnnotation(accuFirrtl1))). the error is:

but when I rewrite Accumulator as:

val accuFirrtl: String =
      s"""
         |circuit fib :
         |  module fib :
         |    input go : UInt<1>
         |    input reset1 : UInt<1>
         |    input clk : Clock
         |    output out : UInt<4>
         |
         |    reg n : UInt<4>, clk with :
         |      reset => (UInt<1>("h0"), n)
         |    out <= n
         |    n <= mux(reset1, UInt<4>("h0"), tail(add(n, go),1))
         |    """.stripMargin

it's compiled successfully:

the only difference is that I unfold the tail(add(n, go) expression in the failed case, while I think it's proper expression in low Firrtl. I wonder if treadle can parse this unfold expression.

[chick]

I believe this is caused by the firrtl parser being very sensitive to spaces in some contexts. by fixing up the use of spaces on the lines defining _T_11 and _T_12 the following string worked for me:

s"""
       |circuit fib :
       |  module fib :
       |    input go : UInt<1>
       |    input reset : UInt<1>
       |    input clk : Clock
       |    output out : UInt<4>
       |
       |    reg n : UInt<4>, clk with :
       |      reset => (UInt<1>("h0"), n)
       |    node _T_11 = add(n, go)
       |    node _T_12 = tail(_T_11 , 1)
       |    out <= n
       |    n <= mux(reset, UInt<4>("h0"), _T_12)
       |    """.stripMargin

[wky17]

yes this worked, thank u so much!