C / C++ / MFC

piul wrote:

is there any way of detecting if a pointer points to a variable in the stack or in the heap??

DWORD dwStackTop = 0;
 __asm
{
    mov     EAX, FS:[4]
    mov     dwStackTop, eax

}

piul wrote:

I have a list (CList) of pointers. Some of them point to variables in the heap a some others not.

piul wrote:

That is, it's not that I want to mix pointers in the same list, but I want to make sure that I am not doing it by mistake and find out only when the program crashes.

James R. Twine wrote:

I am pretty certain that there is a bit that is set for all addresses used for heap allocations.

// IsOnStack.cpp : Defines the entry point for the console application.
//
 
#include "stdafx.h"
#include <iostream>
#include <windows.h>
using namespace std;
 
bool IsOnStack(const void *pData)
{
	DWORD StackBase;
	DWORD StackLimit;
	__asm 
	{
		MOV EAX, DWORD PTR FS:[0x04]
		MOV StackBase, EAX
		MOV EAX, DWORD PTR FS:[0x08]
		MOV StackLimit, EAX
	}
 
	DWORD Address = reinterpret_cast<DWORD>(pData);
 
	return (Address >= StackLimit) && (Address < StackBase);
}
 
const char* PrintStack(const void *pData)
{
	return IsOnStack(pData) ? ": Stack" : ": Not on Stack";
}
 
int main(int argc, char* argv[])
{
	const char *pString1 = "String1";
	cout << pString1 << PrintStack(pString1) << endl;
 
	char String2[] = "String2";
	cout << String2 << PrintStack(String2) << endl;
 
	return 0;
}

String1: Not on Stack
String2: Stack

#define STRINGIZE(_x) #_x
#define STRINGIZEVALUE(_x) STRINGIZE(_x)

char projectName[]= STRINGIZEVALUE(PROJECT_NAME);

Rajkumar R wrote:

#define STRINGIZE(_x) #_x
#define STRINGIZEVALUE(_x) STRINGIZE(_x)