[Issue 3150] cast from dynamic array to ulong is allowed

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3150



--- Comment #2 from Don <clugdbug at yahoo.com.au> 2010-05-10 02:00:27 PDT ---
druntime currently relies on this behaviour in one place, and it's pretty nasty
code. For example, it assumes pointers are 32 bits long.

rt/lifetime.d
_d_newarraymT()
_d_newarraymiT()
These both cast a void[] to a ulong.

Instead of:
        result = cast(ulong)foo(ti, pdim, ndims);
should be: 
        static assert((void[]).sizeof == ulong.sizeof);       
        void[] r = foo(ti, pdim, ndims);
        result = *cast(ulong *)&r;

In fact, this is a very ugly bit of code. It only seems to be used in e2ir.c,
NewExp::toElem(), where there's another hack to get the .ptr out of the ulong.
I don't see any reason why extern(D) couldn't be used instead, so that it could
just return an array.

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