Re: forward pointers

On Fri, 22 Jun 2001, Christopher Ferrall wrote:

This is listed in "Other known bugs"

...

forward referencing pointers generate debug info that appears as generic pointers; no information of `with'
statements is currently given to the debugger; error in debug entries generated for objects

Is this the same as this problem:

type xptr = ^x_type; x_type = record stuff ... next : xptr; end; var xlist, x : xptr; begin new(xlist); xlist.next:=nil;

This line should read: new(xlist); xlist^.next:=nil;

... x := xlist; repeat with x^ do begin

Since there is no code here to end the loop replaced it with a for-loop. Also the begin does not have a matching end.

 new(next);
 x := next;

until no_more_to_create;

At runtime: Program received signal SIGSEGV, Segmentation fault. Inside gdb: (gdb) print x[0] Attempt to dereference a generic pointer.

While I have not used gbd, with the changes above the program works. Increasing the size of the for-loop to force it to run out of heap and the program exits with a "out of heap" message. Conclusion: you are dereferencing a pointer but the dereference is in code you didn't supply.

Hope this helps Russ