Am Fri, 11 Aug 2017 18:44:56 +0000 schrieb bitwise <bitwise....@gmail.com>:
> […] That can't work and here is why: Druntime employs a conservative GC that will treat several things as potential pointers to GC memory. From the top of my head, the entire stack as well as void[] arrays and unions that contain pointers. Some integer variable on the stack or a chunk of a void[] that happens to have the same value as your GC pointer will keep it alive. Same for a union of an integer and a pointer where you have set the integer part to the address of your GC memory chunk. These misidentifications (false pointers) can become a real problem on 32-bit systems, where due to the small address space many things can look like valid pointers and keep GC memory alive that should long since have been recycled. P.S.: Also keep in mind that if you were to run multi-threaded, the ptr you test for could have been recycled and reassigned between GC.collect() and GC.addrOf(). Some unittesting frameworks for example run the tests in parallel. -- Marco
