Why this code raise to EXCEPTION_STACK_OVERFLOW?

Question

So i write the code.

I dont understand why this is going to EXCEPTION_STACK_OVERFLOW?

#include <iostream>
using namespace std;
int main(){
    char data[2048][2048] = {{0}};
    cout << "test";
    return 0;
}

even if i dont inilitialize

char data[2048][2048];

situation is the same on both cases.

Running "main.exe", press ESC to terminate...        
Crash                                                
  EXCEPTION_STACK_OVERFLOW                           
  time consumed: 0.01 sec                            
  time passed:   0.08 sec                            
  peak memory:   4395008 bytes

4Mb is larger than the default stack size. See http://stackoverflow.com/questions/1825964/c-c-maximum-stack-size-of-program — Richard Critten, Mar 26 '15 at 18:11
because `data` is too big to be "automatic storage duration" — user3528438, Mar 26 '15 at 18:11
Because data is too big to fit on the stack. Make it a vector. — Neil Kirk, Mar 26 '15 at 18:12
@Daniel: Don't do that. Move the array to dynamic memory instead. — Mooing Duck, Mar 26 '15 at 18:20

szulak · Answer 1 · 2015-03-26T18:58:40.060

2

Your variable is too big to keep it on the stack. You should use dynamic storage duration.

std::unique_ptr<char[]> data(new char[2048*2048]);

However, if you really want or must keep it on the stack, here is a gcc flag to change the default stack size:

--stack,4194304 where 4194304 is stack size in bytes

edited Mar 26 '15 at 18:58

answered Mar 26 '15 at 18:20

szulak

703
7
16

Or you can increase the amount of stack space allocated. – Rob K Mar 26 '15 at 18:25
2

please do not recommend raw allocation for something that is better solved with a `std::vector` – Mgetz Mar 26 '15 at 18:30
@Mgetz I think you should reconsider what did you write in terms of comparison std::vector and std::unique_ptr. – szulak Mar 26 '15 at 18:35
@szulak What are you arguing? That thrown exception doesn't leak `data`? That raw pointer isn't harder to use incorrectly than `std::vector` and `std::unique_ptr`? Guess what. It does, and it is. – milleniumbug Mar 26 '15 at 18:56
I've shown two options, so OP could choose the one he/she wants. Anyway, I edited my answer and removed raw allocation. – szulak Mar 26 '15 at 18:59

Why this code raise to EXCEPTION_STACK_OVERFLOW?

1 Answers1