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determining the IP of a function

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# 1  
Old 01-13-2011
determining the IP of a function
Is there a way to determine the "Instruction Pointer" of a function in c++, and if so can someone tell me?
# 2  
Old 01-13-2011
"instruction pointer" is a hardware register and doesn't make much sense. I think you mean the function pointer? Just the function name without the parameters gives you the pointer.

Code:
#include <stdio.h>

int main(void)
{
    printf("pointer to printf is: %p\n", printf);
}

Code:
$ ./a.out
pointer to printf is 0x8048304
$

You cannot take a pointer to main in C++ however, it's special. Some C compilers will let you though.

---------- Post updated at 01:16 PM ---------- Previous update was at 01:05 PM ----------

...and for class members, you can take a pointer like:

Code:
#include <stdio.h>

class asdf
{
public:
    void member(void)
    {
    }
};

int main(void)
{
        printf("pointer to asdf::member is %p\n", &asdf::member);
        return(0);
}

# 3  
Old 01-13-2011
Yea, I meant function pointer Smilie but is the function pointer the actual address of the first instruction in the function, or is it a virtual address?
# 4  
Old 01-13-2011
It should point to the first instruction, yes.
# 5  
Old 01-13-2011
Is there also a way to determine the function stack (start address of the function stack)?
Last edited by neur0n; 01-14-2011 at 11:15 AM..
# 6  
Old 01-14-2011
NeurOn, please read up about Calling Conventions. That will give you a general overview. Then you need to read the ABI specification for the your particular hardware platform. For example, if you are on a GNU/Linux X86_64 platform you need to read the AMD64 ABI specifcation which is available at AMD64.
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