topic About 5744p stack initial in MPC5xxx

About 5744p stack initial

liujinhang — Mon, 26 Sep 2016 08:03:45 GMT

hi,

if there is a function likes bellow:

void Func_A(void)

{

unsigned int a;

unsigned int b = 0;

}

can we make sure the local variables 'a' and 'b' are all zero when Func_A is called?

if we can't make sure 'a' will be zero, how can we do to make sure that?

i know one way of coding like below:

unsigned int a = 0;

but some times i can not make sure all local variables are all initialed. how can i do to make compiler to initial all un-initialled local variables to zero before running the functions?

PS: my compiler is Green Hills.

Re: About 5744p stack initial

davidtosenovjan — Mon, 26 Sep 2016 10:41:30 GMT

Hi, it is rather question for GreenHills but in principle only “unsigned int a = 0;” or further initialization in code will guarantee unitialized local variable is cleared.

Re: About 5744p stack initial

stanish — Mon, 26 Sep 2016 10:58:34 GMT

Hi,

I'm not aware of such a a feature/switch.

User is responsible for the initialization of all the local variables. These variables exists on stack or a register.

Anyway compiler should issue a warning in case there is an uninitialized variable. So I'd suggest you to start with these warnings.

Stan