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3368 :: Cannot seem to get "Identifier Mangling" to work

• monster (orginal) [2017-11-25T18:53:24+01:00] view original

  This (shortened) example from "Nim Tutorial" seems to work:

  proc echoHW() =
    echo "Hello world"
  
  template joinSymbols(a, b: untyped): untyped =
    `a b`()
  
  joinSymbols(echo, HW)
  Run

  But my code doesn't:

  type
    VolatilePtr*[T] = distinct ptr T
  
  template declVolatile*(T: typedesc, name: untyped): void =
    var `volatile name value` {.global,volatile.}: T
    let `name` {.global.}: VolatilePtr[T] = cast[VolatilePtr[T]](addr `volatile name value`)
  
  declVolatile(int, threadCount)
  
  when isMainModule:
    echo(threadCount)
  Run

  This result in those identifiers:

  NI volatile volatilenamevalue_l29bFN9bK8y2ZuBqw7Gl4Shg;
  NI* name_4LlT1AEFwYS4u0oi4cs1Ig;
  Run

  when I was expecting "volatilethreadCountvalue..." and "threadCount..."

  Also, I'd like to use _ as separators (volatile_ name _value) but apparently it's not allowed. Why?

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• Araq (orginal) [2017-11-25T20:25:35+01:00] view original

  This works

  type
    VolatilePtr*[T] = distinct ptr T
  
  template declVolatile*(T: typedesc, name: untyped) {.dirty.} =
    var `volatile name value` {.global,volatile.}: T
    let `name` {.global.}: VolatilePtr[T] = cast[VolatilePtr[T]](addr `volatile name value`)
  
  declVolatile(int, threadCount)
  
  when isMainModule:
    echo(threadCount)
  Run

  Also, I'd like to use _ as separators (volatile name _value) but apparently it's not allowed. Why?

  Never considered that. To influence name mangling, you should use an extern: "volatile_$1_value" pragma anyway.

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