• M3T-NC308WA V.5.00 Release 1 through V.5.20 Release 02
  (for the M32C/90, M32C/80 and M16C/80 series of MCUs)
• M3T-NC30WA V.5.00 Release 1 through V.5.30 Release 02
  (for the M16C/60, M16C/30, M16C/20, M16C/10, M16C/Tiny and R8C/Tiny series of MCUs)
  
  

2.1 Conditions

This problem may occur if the following conditions are all satisfied:

(1)	The optimizing option -OR is selected.
(2)	Two or more function calls are made as follows: The same function calls are made at more than one place in a function. Function calls are indirectly made using the same pointer at more than one place in a function. Function calls are indirectly made using pointers belonging to a union at more than one place in a function. NOTE: Items b and c include every case where the same function calls or different function calls are made at more than one place.
(3)	After the function calls in (2) are made, two or more processing flows merge into one at a point.
(4)	Among the functions called before the merging point in (3), some are such that the number of arguments passed to them via registers is different from each other.

NOTICE: Conditions (2)-a and -b are both programming errors.

2.2 Examples

1.

Case where Condition (2)-c satisfied (function calls indirectly made using pointers belonging to a union) -------------------------------------------------------------------- union { void (*pf0)(void); void (*pf1)(int); } u; int example2(int i) { switch (i) { case 0: case 2: (*u.pf1)(0); /* Conditions (2)-c and (4) */ break; default: (*u.pf0)(); /* Conditions (2)-c and (4) */ break; } return 0; /* Condition (3) */ } --------------------------------------------------------------------

2.

Case where Condition (2)-a satisfied (same function calls made at more than one place) NOTE: This example is a result of a programming error. The number of arguments taken by the function called at the "else" side does not match up with the one in the function's prototype declaration. When a source program like this is compiled, the warning message saying "too few parameters" will be delivered even if compilation terminates normally. -------------------------------------------------------------------- void func(int); int example1(int i) { if (i == 0) { func(0); /* Conditions (2)-a, (3), and (4) */ } else { func(); /* Conditions (2)-a, (3), and (4) */ } return 0; /* Condition (3) */ } --------------------------------------------------------------------

Modification of Example 1
-------------------------------------------------------------------------
union {
    void (*pf0)(void);
    void (*pf1)(int);
} u;

int example2(int i)
{
    switch (i) {
    case 0:
    case 2:
        (*u.pf1)(0);
        break;
    default:
        (*u.pf0)();
        asm();          /* Place asm(); here */
        break;
    }
    return 0;
}
-------------------------------------------------------------------------