CODEWITHSUNDEEP
cmemory-mapped-filessections
Jon marsh
Jon marsh

Reputation: 339

How Structure can be mapped with section attribute in a c program?

It is just a random thought about the structures in a c program.

In C program __attribute__ provide a feature to specify special attributes when making a declaration.

section - Where a particular variable or a function can be placed at a particular address with the help of "section"

For example for a variable to be defined with attribute it can be done like this

int g1 __attribute__((section (".vector"))) = 100;

For a function to be defined with attribute it can be done like this 

int some_function(void) __attribute__((section(".vector")));
   int some_function(void)
   {
   int local_variabale1 = 100;
    return local_variable1;

   }

so from above examples it is possible to put the section .vector at a particular address in which I specify the address in linked scripts.

Will there be a chance for structure in C to put the structure in section?

Suppose if this is my structure program in c

struct database
    {
    int employee_number;
    string name;
    int phone_number;
    };

If it is possible how can it be done?

Upvotes: 1

Views: 1507

Answers (1)

user149341
user149341

Reputation:

Will there be a chance for structure in C to put the structure in section?

The definition of a structure doesn't exist anywhere in memory at runtime -- it's only used during compilation. As such, it doesn't make sense to give it a section.

If you're declaring an instance of that structure (e.g. struct database DB), that's a variable, and that can be placed in a section. The structure itself isn't a variable, though.

Upvotes: 3

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