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defining local procedures

mtwadeCU

I'm confused about local functions. In the Cadence Help documentation, there is a section called "Using procedures to Declare Local Functions." Let's look at Example 1 in that section. 

procedure( trParity( x )
    procedure( isEven(x) 
        x == 0 || isOdd( x-1 )
        ) 
    procedure( isOdd(x) 
        x > 0 && isEven(x-1) 
        ) 
    if( isEven( x ) then 'even else 'odd )
    ) ; procedure

I assumed that isEven and isOdd are only accessible inside of trParity. However, if I go to the CIW after loading that procedure, I can call isOdd and isEven -- i.e. it seems those functions are not local to trParity. I was hoping to use local functions in some of my own custom procedures, but this same problem comes up. Am I missing something? 

Thanks,

Mark

  • Hi Mark,

    I have not really read through the section that you are talking about, but it is in the SKILL++ section of the manual.  As such, for this to work as you expect (a locally defined procedure only valid inside the parent procedure) then it needs to be evaluated in the SKILL++ environment.  One way to do this is to use toplevel('ils) before entering the code.  Another way is to save the procedure in a filename <something>.ils which tells the parser to use SKILL++ lexical scoping.  Without this, this is just regular SKILL, and SKILL only has one 'namespace' so to speak, and so all procedures are declared at the same 'global' scope.  I'm probably getting the terminology wrong, but the above information should answer your question and hopefully get you working.  Refer back to the start of the section "About SKILL++ and SKILL" for more information.

    Best regards,

    Lawrence.

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