Subject:
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Re: maximum number of variables in RCX2 ?
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Wed, 20 Feb 2002 09:14:40 GMT
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Viewed:
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3254 times
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"John Guerquin" <jguerquin@sympatico.ca> writes:
> When using the RCX2 target, the NQC manual (Section 2.2.4) states that 32
> global variables, and 16 local variables (per task) are allowed. Does • this
> mean that the whole program can only have 48 variables total when using • only
> one task, ie. "main" , and several functions?
>
> The reason I ask this question, is that my understanding of local • variables
> is that space is allocated only when the function has been called. Once • the
> function is complete, the memory that was used to store those local
> variables is returned back to the 'memory pool'. If anyone could clarify
> the limitations of NQC variables, as well as how the limitations apply to
> arrays, I would greatly appreciate it.
From my understanding of NQC, the compiler automatically selects the most
suitable location to store variables. Global variables are obviously always
allocated in one of the 32 global storage locations. Variables local to a
specific code block (task, function, sub) are automatically allocated from
the 16 local locations or the 32 global ones, though the location is
"released" and reused for other local variable after the code block ends. I
imagine that the compiler stores local variable in the local locations when
possible, but this is just an hypothesis :-)
NQC also allocates some temporary variable needed to store intermediate
results of expressions.
I'm not sure about how array storage space is allocated, but I suppose it
follows the same rules: global locations for global arrays, and (possibly)
local ones for local arrays.
Mario
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Message is in Reply To:
 | | maximum number of variables in RCX2 ?
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| When using the RCX2 target, the NQC manual (Section 2.2.4) states that 32 global variables, and 16 local variables (per task) are allowed. Does this mean that the whole program can only have 48 variables total when using only one task, ie. "main" , (...) (23 years ago, 20-Feb-02, to lugnet.robotics.rcx.nqc)
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