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const placed in DATA segment

Grekhov Vladimir

Hi All,
when I write:
const char mysting[] ={"my string"};

data are placed to DATA segment, not code sement. I know if it would be written like this:

code char mysting[] ={"my string"};

data will be placed in code segment. What I have to do for automatic placing const data to code segment? I did it by #define const code
But may be other ways are exist.

Thanks,
Vladimir

Parents
  • 0 in reply to Grekhov Vladimir

    'const' is similar read-only, but it is not a memory_storage_qualifier.

    Look at the example:

    struct CCC {
  const int x;
  int y;
} ccc = { 1, 2 };

void func(const char *str)
{ char * ptr;

  ptr = str;  // MUST produce WARNING

  *ptr = 'B'; // LEGAL
  *str = 'A'; // ILLEGAL

  ccc.y = 5;  // LEGAL
  ccc.x = 2;  // ILLEGAL
}


    In example above, how possible solid object like 'struct' divide to different memory classes ?

    'x' member to 'code' memory but
    'y' member to 'data/xdata' memory ?

    Obviously, this is absurd.

    How work IAR in this case ?

Reply
  • 0 in reply to Grekhov Vladimir

    'const' is similar read-only, but it is not a memory_storage_qualifier.

    Look at the example:

    struct CCC {
  const int x;
  int y;
} ccc = { 1, 2 };

void func(const char *str)
{ char * ptr;

  ptr = str;  // MUST produce WARNING

  *ptr = 'B'; // LEGAL
  *str = 'A'; // ILLEGAL

  ccc.y = 5;  // LEGAL
  ccc.x = 2;  // ILLEGAL
}


    In example above, how possible solid object like 'struct' divide to different memory classes ?

    'x' member to 'code' memory but
    'y' member to 'data/xdata' memory ?

    Obviously, this is absurd.

    How work IAR in this case ?

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