On 20/10/2010, at 1:33 AM, john skaller wrote:
> This program crashes:
>
> //-------
> noinline proc f() {
> var p = C_hack::cast[&(string * string)] (C_hack::xnew("Hello","World"));
> println$ *p;
> }
>
> f();
> collect();
> println$ "Done";
> //-----
well now, here is the problem:
~/felix>build/release-optimized/bin/flx --test=build/release-optimized/ --force
--nofelix tgc
('Hello', 'World')
Finalising at 0x1001005a0 for 2 objects type _at9100 size 16
Try to finalise string at 0x1001005a0=Hello
Size of string is 8
Size of void* is 8
Try to finalise string at 0x1001005b0=(null)
Size of string is 8
Size of void* is 8
Felix is adding 16 to the pointer to get the next string.. that's the size of
the whole
array, not the size of one element.. simple!
BTW: I do NOT understand how the size of a string can possibly be 8 on a 64 bit
machine. I mean I do: it has to be a pointer to a control block:
struct { int size; char *data; }
but this just means an extra malloc when passing by value. Pass by reference
would
be faster but idiomatic (normally you'd pass a pointer to the variable in
question,
but here you pass the actual value). Ugg. The copy constructor will be very
slow.
I really don't understand this.
--
john skaller
[email protected]
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