Echelon NodeBuilder Errors 3120 User Manual download pdf (Page 57)

NodeBuilder Errors Guide 5-37

NCC# Description

265

266

267

The stack frame of this procedure is too large (>200 bytes)

[NCC#265]

The stack frame of this procedure exceeds 100 bytes [NCC#266]

The stack frame of this procedure exceeds 7 bytes [NCC#267]

On Neuron Chips, references to variables near the top of the stack

use the most efficient instructions. The further down in the stack

one goes, the less efficient the instructions become. This inefficiency

affects both the code size and the code performance. A stack frame

larger than seven bytes begins to incur this penalty. The stack frame

includes the parameters and the local variables.

Neuron Chips, especially the 3120 Chips, which are the most limited

in RAM, do not have very large memory areas set aside for stacks.

Procedures which exceed 200 bytes would not work on Neuron 3120

Chips, thus this is a compile-time error. Procedures that exceed 100

bytes are flagged with a special warning message since they use

more than half of the stack resources; and, nesting these functions

would cause a stack overflow. The compiler does not specifically

check for nesting, but attempts to use this warning to catch large

procedures.

268

Recommend use of an unqualified 'msg_arrives' event

[NCC#268]

A program which receives explicit messages through the

msg_arrives event will be given all such messages which come into

the node, whether their message codes are expected or not. Any

unexpected messages must be handled by the program through a

"catch-all" unqualified msg_arrives event, otherwise such messages

will get stuck at the head of the message queue. See the chapter on

messages in the Neuron C Programmer's Guide for more information

on processing incoming messages.

273

Procedure code generation label resources exhausted

[NCC#273]

Code generation is performed on a procedure-by-procedure basis.

The compiler reuses certain internal resources during code

generation of each procedure. One of these resources is internal label

markers. There are only a limited number of labels that can be used

in a given procedure. These labels are used in each possible

branching scenario, in loops, if statements, ?: operators, and switch

statements. By far the most common cause of this message is a very

large procedure containing a switch statement with many cases.

The simplest recourse is to split the switch statement into two or

more switch statements, and move each to a separate subprocedure.

274 Use of possibly unitialized variable [NCC#274]

The Neuron C compiler tracks the use of automatic variables (those

which are local to a function or procedure, or a sub-scope of a

function or procedure). If such a variable is accessed (read) prior to

its having been stored (written), this warning is issued. Structure

fields and array elements are not individually tracked.

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