RE: Function to see if a pointer is on the stack

The most reliable way of doing this is to use a class for
your argument rather than bare pointers, and have a
constructor from bare pointers, and use reference counting
in the class implementation -- this is almost exactly what
std::string<> already does for you!

Else, you can register the stack pointer in main() (or the
entry function for each thread/fiber), and get the stack
pointer in the called function, and compare -- this is not
entirely portable, because the stack may grow up on some
architectures.

// non-threaded version -- if you use threads or fibers,
// you need one gBase per thread/fiber

char * gBase;

void register_main( char * base ) {
  gBase = base;
}

bool is_stack_pointer( char const * ptr ) {
  char top[10];
  assert( top < gBase ); // else stack grows up
  return (ptr < gBase) && (ptr > top);
}

int main() {
  ...
  char junk[ 10 ];
  register_main( junk );
  ...
}

void some_func( char * anArg ) {
  if( is_stack_pointer( anArg ) ) {
    ...
  }
}


-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of
Jacob Turner (Core Design Ltd)
Sent: Thursday, August 19, 2004 9:30 AM
To: [email protected]
Subject: [GD-Windows] Function to see if a pointer is on the stack


Is there some simple and reliable code for a console or windows app to test
if a pointer value is on the stack or not ?

If the pointer is on the stack (e.g. a string) then we want to copy the
string to heap memory for reuse later on.

Cheers

Jake


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