D's New GC and Object Allocation Pools

[Mike via Digitalmars-d]

On Sunday, 26 October 2014 at 07:08:21 UTC, Mike wrote:

> I tried this on my Linux desktop, and while everything compiled 
> and linked without errors, it resulted in a segmentation fault 
> at runtime.  But where I have failed, others may succeed.  I 
> tested with LDC and GDC, but not DMD.

It does work, but for some reason if I replace the printf 
statement below with D's writeln, I get a segmentation fault.  I 
don't know why.  Anywhere here's a trivial example to illustrate 
the idea.

module main;

import std.stdio;
import core.stdc.stdio;

extern (C) Object __wrap__d_newclass(const ClassInfo ci)
{
     printf("You haven't provided any custom allocation yet!\n");
     while(true) {}
     return null;
}

void main(string[] args)
{

}

Compile with:
gdc -Wl,-wrap,_d_newclass main.d

You'll see it output the string before it even reaches main 
because the runtime initialization seems to allocate a few 
things.  But, you get the idea. destroy is just a template, 
however, so it will need a different method.

Mike