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Calltree problem

Bernhard Felkel

There is a strange behaviour of the linker concerning the calltree!

Look at this simple code:

void Function1()
{
	int a;
}

void Function2(void (code *fptr)(void))
{
	int b;
	fptr();
}

main()
{
	Function2(Function1);
}
Function1 gets called from Function2 via pointer. Both functions declare a local variable (a and b).

The linker LX51 produces this calltree:
FUNCTION/MODULE              BIT_GROUP   DATA_GROUP
--> CALLED FUNCTION/MODULE  START  STOP  START  STOP
====================================================
?C_C51STARTUP               ----- -----  ----- -----
  +--> ?PR?MAIN?MAIN

MAIN/MAIN                   ----- -----  ----- -----
  +--> ?PR?FUNCTION1?MAIN
  +--> ?PR?_FUNCTION2?MAIN

FUNCTION1/MAIN              ----- -----  0008H 0009H

_FUNCTION2/MAIN             ----- -----  0008H 0009H
I think that's not correct, because Function1 is not called by main() !

As a result of this calltree the linker locates the variables a and b to the same address!

      00000008H   SYMBOL    DATA     INT       a
      00000008H   SYMBOL    DATA     INT       b

As workaround I manipulated the calltree via linker options. Any other ideas ??

Bernhard

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