Simplifying generated code

[mchalupa]

(Just tracking the ideas for the future...)

// struct declarations

// anonymous struct declarations

// type definitions

// struct definitions

// function declarations
int main();
void test_assert(unsigned int var0);

// global variable definitions

int main(){
    unsigned int var0;
    unsigned int var1;
    unsigned int var2;
    unsigned int var3;
    block0: ;
    var0 = 0;
    var1 = 0;
    var2 = 1;
    var3 = 3;
    var1 = (((int)var2) + ((int)var3));
    var2 = 3;
    var3 = 5;
    test_assert((unsigned int)(var1 == 4));
    return 0;
}

This code has several issues that we could remove:

• the comments at the beginning of the program are not needed if nothing is generated for them

• Set the signess of a variable in declaration if it is always used with a sign. #26 (var2 and var3)

• Functions with no arguments should have void keyword specified #25 (the main function)

• we could get rid of the ; after block0: in cases where there's no declaration immediately after the label

• we can remove labels that are not referred to by any goto (block0 in this case)

• we can remove unconditional jumps on labels that are going to be executed even without the jump (when the C code immediately follows the jump) (not in this code)