We help IT Professionals succeed at work.

How to get stack size programatically

Shrif
Shrif asked
on
Medium Priority
3,120 Views
Last Modified: 2013-12-03
How do get the size of the stack of my application from program code.  Unless a different value is specified via the /STACK statement on the command line of the linker, or the STACK statement in a program's .DEF file, the stack size of a Windows program is 1 megabyte.  How do I get this value from inside of the C++ program, short of reading the PE header.
Comment
Watch Question

Commented:
Why do you need to know this ?
Well, I can think of one way to do this: get a pointer to a local variable, then move this pointer downward (ptr--) and use IsBadReadPtr() on it. Eventually you'll hit the stack guard page and IsBadReadPtr() will return non-zero. This will give you the bottom of the stack. Use the same approach to get the top address of the stack.
Of course, you can add/substract page size to the pointer for better performance.
I don't know if this has the effect of commiting physical memory to your entire stack range.

Author

Commented:
I am sorry but, I really think there's a better answer.  This information should be available somewhere in the system.In answer to your question, I need to know this so that I can check for stack-overflows in recursive calls.  I have a built-in scripting engine in my program.  This software is maintained by a number of people so I really don't want to hard code 1-meg in my code.  Someone later may change the stack to be smaller for for whatever reason, and not change my hard coded number in C++
Commented:
OK, let's go assembly:

  DWORD dwStackSize; //size of current thread's stack
  _asm {
       mov eax,fs:[4]
       sub eax,fs:[8]
       mov dwStackSize,eax
  }

Don't know how to do this on non-intel CPU's.  

Not the solution you were looking for? Getting a personalized solution is easy.

Ask the Experts
Access more of Experts Exchange with a free account
Thanks for using Experts Exchange.

Create a free account to continue.

Limited access with a free account allows you to:

  • View three pieces of content (articles, solutions, posts, and videos)
  • Ask the experts questions (counted toward content limit)
  • Customize your dashboard and profile

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.