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

Unfortunately can't do the reliable method.  My example for copying strings is just an example so can't use std::string<> or bare pointer technique.

Bit scared about the other option because we are in a multi-threaded app and this function would be common to all threads and we don't have explicit creation of common library stuff when a new thread is made.

Isn't there a really PC specific code e.g. getting the stack ptr etc.  This is how I am doing the function on consoles.

Mind you not a big hassle because on the PC we have so much memory that don't care if just always copy strings or whatever data i.e. can make is variable on stack function return TRUE all the time.

Thanks

Jake

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of
> Jon Watte
> Sent: 19 August 2004 18:19
> To: [email protected]
> Subject: RE: [GD-Windows] 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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